# Logtalk APIs ## Libraries To load any library (including developer tools, ports, and contributions), use the goal `logtalk_load(library_name(loader))`. To run the library tests, use the goal `logtalk_load(library_name(tester))`. To load an entity, always load the loader file of the library that includes it to ensure that all required dependencies are also loaded and that any required flags are used. The loading goal can be found in the entity documentation. ### adaptive_boosting_classifier") **object** #### `adaptive_boosting_classifier` Adaptive Boosting classifier using C4.5 decision trees as base learners. Implements the SAMME (Stagewise Additive Modeling using a Multi-class Exponential loss function) variant, which supports multi-class classification. Builds an ensemble of weighted decision trees where each subsequent tree focuses on the examples misclassified by previous trees. **Availability:** `logtalk_load(adaptive_boosting_classifier(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** c45_classifier fast_random(Algorithm) format list pairs type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, c45_classifier, isolation_forest_anomaly_detector, knn_classifier, naive_bayes_classifier, nearest_centroid_classifier, random_forest_classifier ### agglomerative_clusterer") **object** #### `agglomerative_clusterer` Agglomerative clusterer for continuous datasets. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(agglomerative_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** avltree binary_heap_min format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, kcenters_clusterer, kmeans_clusterer, kmedoids_clusterer ### amqp") **object** #### `amqp` Portable AMQP 0-9-1 (Advanced Message Queuing Protocol) client. Uses the sockets library for TCP communication. **Availability:** `logtalk_load(amqp(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-06-16 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** list os socket term_io **Remarks:** > - Supported backends: ECLiPSe, GNU Prolog, SICStus Prolog, SWI-Prolog, Trealla Prolog, and XVM (same as the sockets library). > > - Protocol version: Implements AMQP 0-9-1 specification. > > - Binary protocol: AMQP is a binary protocol with typed frame encoding. > > - Channels: Supports multiple concurrent channels over a single connection. > > - Exchanges and queues: Full support for declaring exchanges, queues, and bindings. > > - Content: Supports message publishing and consuming with content headers. > > - Transactions: Supports AMQP transactions with tx.select, tx.commit, and tx.rollback. > > - Publisher confirms: Support for publisher confirms can be added. > > - Heartbeat: Supports heartbeat negotiation to keep connections alive. > > - Reconnection: Automatic reconnection with configurable retry attempts and delays. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `connect/4` - `close/1` - `close/3` - `connection_alive/1` - `channel_open/3` - `channel_close/1` - `channel_close/3` - `exchange_declare/3` - `exchange_delete/3` - `exchange_bind/4` - `exchange_unbind/4` - `queue_declare/3` - `queue_delete/3` - `queue_bind/4` - `queue_unbind/4` - `queue_purge/2` - `basic_publish/4` - `basic_consume/3` - `basic_cancel/3` - `basic_get/3` - `basic_ack/3` - `basic_nack/3` - `basic_reject/3` - `basic_qos/2` - `basic_recover/2` - `receive/3` - `tx_select/1` - `tx_commit/1` - `tx_rollback/1` - `confirm_select/1` - `send_heartbeat/1` - `message_body/2` - `message_properties/2` - `message_property/3` - `message_delivery_tag/2` - `message_exchange/2` - `message_routing_key/2` - `encode_frame/2` - `decode_frame/2` - Protected predicates - Private predicates - `decode_field_value/3` - Operators ##### Public predicates ###### `connect/4` Connects to an AMQP 0-9-1 server and performs the protocol handshake. Returns a connection handle for subsequent operations. Supports automatic reconnection on connection failures. **Compilation flags:** `static` **Template:** `connect(Host,Port,Connection,Options)` **Mode and number of proofs:** `connect(+atom,+integer,--compound,+list)` - `one_or_error` **Exceptions:** Connection refused or network error: `amqp_error(connection_failed)` Server rejected connection: `amqp_error(protocol_error(Message))` Authentication failed: `amqp_error(auth_failed)` All reconnection attempts failed: `amqp_error(reconnect_failed)` **Remarks:** > - Option username(Username): Username for authentication. Default is guest. > > - Option password(Password): Password for authentication. Default is guest. > > - Option virtual_host(VHost): Virtual host name. Default is /. > > - Option heartbeat(Seconds): Heartbeat interval in seconds. Default is 60. > > - Option channel_max(Max): Maximum number of channels. Default is 0 (no limit). > > - Option frame_max(Max): Maximum frame size. Default is 131072. > > - Option reconnect(Boolean): Enable automatic reconnection on connection failure. Default is false. > > - Option reconnect_attempts(N): Maximum number of reconnection attempts. Default is 3. Only used when reconnect(true). > > - Option reconnect_delay(Seconds): Delay between reconnection attempts in seconds. Default is 1. Only used when reconnect(true). ------------------------------------------------------------------------ ###### `close/1` Gracefully closes the AMQP connection. Closes all channels and the connection itself. **Compilation flags:** `static` **Template:** `close(Connection)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` ------------------------------------------------------------------------ ###### `close/3` Closes the AMQP connection with a specific reply code and reason. **Compilation flags:** `static` **Template:** `close(Connection,ReplyCode,ReplyText)` **Mode and number of proofs:** `close(+compound,+integer,+atom)` - `one_or_error` **Exceptions:** `Connection` is not a valid AMQP connection handle: `error` ------------------------------------------------------------------------ ###### `connection_alive/1` Checks if the connection is still open and valid. **Compilation flags:** `static` **Template:** `connection_alive(Connection)` **Mode and number of proofs:** `connection_alive(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `channel_open/3` Opens a new channel on the connection. Returns a channel handle. **Compilation flags:** `static` **Template:** `channel_open(Connection,ChannelNumber,Channel)` **Mode and number of proofs:** `channel_open(+compound,+integer,--compound)` - `one_or_error` **Exceptions:** Channel already open: `amqp_error(channel_error(Message))` ------------------------------------------------------------------------ ###### `channel_close/1` Closes a channel. **Compilation flags:** `static` **Template:** `channel_close(Channel)` **Mode and number of proofs:** `channel_close(+compound)` - `one_or_error` **Exceptions:** `Channel` is not a valid AMQP channel handle: `error` ------------------------------------------------------------------------ ###### `channel_close/3` Closes a channel with a specific reply code and reason. **Compilation flags:** `static` **Template:** `channel_close(Channel,ReplyCode,ReplyText)` **Mode and number of proofs:** `channel_close(+compound,+integer,+atom)` - `one_or_error` **Exceptions:** `Channel` is not a valid AMQP channel handle: `error` ------------------------------------------------------------------------ ###### `exchange_declare/3` Declares an exchange on the server. **Compilation flags:** `static` **Template:** `exchange_declare(Channel,Exchange,Options)` **Mode and number of proofs:** `exchange_declare(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the exchange declaration: `amqp_error(exchange_error(Message))` **Remarks:** > - Option type(Type): Exchange type: direct, fanout, topic, headers. Default is direct. > > - Option durable(Boolean): Survive server restart. Default is false. > > - Option auto_delete(Boolean): Delete when unused. Default is false. > > - Option internal(Boolean): Internal exchange. Default is false. > > - Option arguments(Arguments): Additional arguments as key-value pairs. ------------------------------------------------------------------------ ###### `exchange_delete/3` Deletes an exchange. **Compilation flags:** `static` **Template:** `exchange_delete(Channel,Exchange,Options)` **Mode and number of proofs:** `exchange_delete(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the exchange deletion: `amqp_error(exchange_error(Message))` **Remarks:** > - Option if_unused(Boolean): Only delete if unused. Default is false. ------------------------------------------------------------------------ ###### `exchange_bind/4` Binds an exchange to another exchange. **Compilation flags:** `static` **Template:** `exchange_bind(Channel,Destination,Source,Options)` **Mode and number of proofs:** `exchange_bind(+compound,+atom,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the exchange binding: `amqp_error(exchange_error(Message))` **Remarks:** > - Option routing_key(Key): Routing key for binding. Default is empty. > > - Option arguments(Arguments): Additional arguments. ------------------------------------------------------------------------ ###### `exchange_unbind/4` Unbinds an exchange from another exchange. **Compilation flags:** `static` **Template:** `exchange_unbind(Channel,Destination,Source,Options)` **Mode and number of proofs:** `exchange_unbind(+compound,+atom,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the exchange unbinding: `amqp_error(exchange_error(Message))` ------------------------------------------------------------------------ ###### `queue_declare/3` Declares a queue on the server. If Queue is a variable, the server generates a unique name. **Compilation flags:** `static` **Template:** `queue_declare(Channel,Queue,Options)` **Mode and number of proofs:** `queue_declare(+compound,?atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the queue declaration: `amqp_error(queue_error(Message))` **Remarks:** > - Option durable(Boolean): Survive server restart. Default is false. > > - Option exclusive(Boolean): Exclusive to this connection. Default is false. > > - Option auto_delete(Boolean): Delete when unused. Default is false. > > - Option arguments(Arguments): Additional arguments (e.g., message TTL, dead letter exchange). ------------------------------------------------------------------------ ###### `queue_delete/3` Deletes a queue. **Compilation flags:** `static` **Template:** `queue_delete(Channel,Queue,Options)` **Mode and number of proofs:** `queue_delete(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the queue deletion: `amqp_error(queue_error(Message))` **Remarks:** > - Option if_unused(Boolean): Only delete if unused. Default is false. > > - Option if_empty(Boolean): Only delete if empty. Default is false. ------------------------------------------------------------------------ ###### `queue_bind/4` Binds a queue to an exchange. **Compilation flags:** `static` **Template:** `queue_bind(Channel,Queue,Exchange,Options)` **Mode and number of proofs:** `queue_bind(+compound,+atom,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the queue binding: `amqp_error(queue_error(Message))` **Remarks:** > - Option routing_key(Key): Routing key for binding. Default is empty. > > - Option arguments(Arguments): Additional arguments. ------------------------------------------------------------------------ ###### `queue_unbind/4` Unbinds a queue from an exchange. **Compilation flags:** `static` **Template:** `queue_unbind(Channel,Queue,Exchange,Options)` **Mode and number of proofs:** `queue_unbind(+compound,+atom,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the queue unbinding: `amqp_error(queue_error(Message))` ------------------------------------------------------------------------ ###### `queue_purge/2` Purges all messages from a queue. **Compilation flags:** `static` **Template:** `queue_purge(Channel,Queue)` **Mode and number of proofs:** `queue_purge(+compound,+atom)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the queue purge request: `amqp_error(queue_error(Message))` ------------------------------------------------------------------------ ###### `basic_publish/4` Publishes a message to an exchange. **Compilation flags:** `static` **Template:** `basic_publish(Channel,Exchange,Body,Options)` **Mode and number of proofs:** `basic_publish(+compound,+atom,+term,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid, `Body` cannot be encoded, or the frame/content transmission fails: `error` **Remarks:** > - Option routing_key(Key): Routing key for message. Default is empty. > > - Option mandatory(Boolean): Return if not routable. Default is false. > > - Option immediate(Boolean): Return if not deliverable. Default is false (deprecated in RabbitMQ). > > - Option content_type(Type): MIME content type. > > - Option content_encoding(Enc): Content encoding. > > - Option correlation_id(Id): Correlation identifier. > > - Option reply_to(Queue): Reply queue name. > > - Option expiration(Ms): Message TTL in milliseconds. > > - Option message_id(Id): Application message identifier. > > - Option timestamp(Ts): Message timestamp. > > - Option type(Type): Message type name. > > - Option user_id(Id): Creating user ID. > > - Option app_id(Id): Creating application ID. > > - Option delivery_mode(Mode): 1 for non-persistent, 2 for persistent. > > - Option priority(P): Message priority (0-9). > > - Option headers(H): Application headers as key-value pairs. ------------------------------------------------------------------------ ###### `basic_consume/3` Starts consuming messages from a queue. **Compilation flags:** `static` **Template:** `basic_consume(Channel,Queue,Options)` **Mode and number of proofs:** `basic_consume(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the consume request: `amqp_error(basic_error(Message))` **Remarks:** > - Option consumer_tag(Tag): Consumer identifier. Server generates if not provided. > > - Option no_local(Boolean): Do not receive own messages. Default is false. > > - Option no_ack(Boolean): No acknowledgment required. Default is false. > > - Option exclusive(Boolean): Exclusive consumer. Default is false. > > - Option arguments(Arguments): Additional arguments. ------------------------------------------------------------------------ ###### `basic_cancel/3` Cancels a consumer. **Compilation flags:** `static` **Template:** `basic_cancel(Channel,ConsumerTag,Options)` **Mode and number of proofs:** `basic_cancel(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the cancel request: `amqp_error(basic_error(Message))` ------------------------------------------------------------------------ ###### `basic_get/3` Synchronously gets a message from a queue. **Compilation flags:** `static` **Template:** `basic_get(Channel,Queue,Options)` **Mode and number of proofs:** `basic_get(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server replies with an unexpected `basic.get` result: `amqp_error(basic_error(Message))` **Remarks:** > - Option no_ack(Boolean): No acknowledgment required. Default is false. ------------------------------------------------------------------------ ###### `basic_ack/3` Acknowledges a message. **Compilation flags:** `static` **Template:** `basic_ack(Channel,DeliveryTag,Options)` **Mode and number of proofs:** `basic_ack(+compound,+integer,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the acknowledgment frame cannot be sent: `error` **Remarks:** > - Option multiple(Boolean): Acknowledge all up to this tag. Default is false. ------------------------------------------------------------------------ ###### `basic_nack/3` Negatively acknowledges a message (RabbitMQ extension). **Compilation flags:** `static` **Template:** `basic_nack(Channel,DeliveryTag,Options)` **Mode and number of proofs:** `basic_nack(+compound,+integer,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the negative-acknowledgment frame cannot be sent: `error` **Remarks:** > - Option multiple(Boolean): Reject all up to this tag. Default is false. > > - Option requeue(Boolean): Requeue the message. Default is true. ------------------------------------------------------------------------ ###### `basic_reject/3` Rejects a message. **Compilation flags:** `static` **Template:** `basic_reject(Channel,DeliveryTag,Options)` **Mode and number of proofs:** `basic_reject(+compound,+integer,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the reject frame cannot be sent: `error` **Remarks:** > - Option requeue(Boolean): Requeue the message. Default is true. ------------------------------------------------------------------------ ###### `basic_qos/2` Sets quality of service (prefetch) settings. **Compilation flags:** `static` **Template:** `basic_qos(Channel,Options)` **Mode and number of proofs:** `basic_qos(+compound,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the QoS request: `amqp_error(basic_error(Message))` **Remarks:** > - Option prefetch_size(Size): Prefetch window size in bytes. Default is 0 (no limit). > > - Option prefetch_count(Count): Prefetch window in messages. Default is 0 (no limit). > > - Option global(Boolean): Apply to entire connection. Default is false. ------------------------------------------------------------------------ ###### `basic_recover/2` Asks the server to redeliver unacknowledged messages. **Compilation flags:** `static` **Template:** `basic_recover(Channel,Options)` **Mode and number of proofs:** `basic_recover(+compound,+list)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects the recover request: `amqp_error(basic_error(Message))` **Remarks:** > - Option requeue(Boolean): Requeue messages. Default is false. ------------------------------------------------------------------------ ###### `receive/3` Receives a message or method from the server. Blocks until data is available or timeout. **Compilation flags:** `static` **Template:** `receive(Channel,Message,Options)` **Mode and number of proofs:** `receive(+compound,-compound,+list)` - `zero_or_one_or_error` **Exceptions:** `Channel` is invalid or the received frame sequence is not a valid AMQP content delivery: `error` **Remarks:** > - Option timeout(Milliseconds): Timeout in milliseconds. 0 for non-blocking, -1 for infinite. Default is -1. ------------------------------------------------------------------------ ###### `tx_select/1` Enables transaction mode on a channel. **Compilation flags:** `static` **Template:** `tx_select(Channel)` **Mode and number of proofs:** `tx_select(+compound)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects `tx.select`: `amqp_error(tx_error(Message))` ------------------------------------------------------------------------ ###### `tx_commit/1` Commits the current transaction. **Compilation flags:** `static` **Template:** `tx_commit(Channel)` **Mode and number of proofs:** `tx_commit(+compound)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects `tx.commit`: `amqp_error(tx_error(Message))` ------------------------------------------------------------------------ ###### `tx_rollback/1` Rolls back the current transaction. **Compilation flags:** `static` **Template:** `tx_rollback(Channel)` **Mode and number of proofs:** `tx_rollback(+compound)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects `tx.rollback`: `amqp_error(tx_error(Message))` ------------------------------------------------------------------------ ###### `confirm_select/1` Enables publisher confirms on a channel (RabbitMQ extension). **Compilation flags:** `static` **Template:** `confirm_select(Channel)` **Mode and number of proofs:** `confirm_select(+compound)` - `one_or_error` **Exceptions:** `Channel` is invalid or the server rejects `confirm.select`: `amqp_error(confirm_error(Message))` ------------------------------------------------------------------------ ###### `send_heartbeat/1` Sends a heartbeat frame to the server. **Compilation flags:** `static` **Template:** `send_heartbeat(Connection)` **Mode and number of proofs:** `send_heartbeat(+compound)` - `one_or_error` **Exceptions:** `Connection` is not a valid AMQP connection handle or the heartbeat frame cannot be sent: `error` ------------------------------------------------------------------------ ###### `message_body/2` Extracts the body from a message. **Compilation flags:** `static` **Template:** `message_body(Message,Body)` **Mode and number of proofs:** `message_body(+compound,-term)` - `one` ------------------------------------------------------------------------ ###### `message_properties/2` Extracts the properties from a message as a list. **Compilation flags:** `static` **Template:** `message_properties(Message,Properties)` **Mode and number of proofs:** `message_properties(+compound,-list)` - `one` ------------------------------------------------------------------------ ###### `message_property/3` Extracts a specific property from a message. Fails if not present. **Compilation flags:** `static` **Template:** `message_property(Message,PropertyName,Value)` **Mode and number of proofs:** `message_property(+compound,+atom,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `message_delivery_tag/2` Extracts the delivery tag from a message. **Compilation flags:** `static` **Template:** `message_delivery_tag(Message,DeliveryTag)` **Mode and number of proofs:** `message_delivery_tag(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `message_exchange/2` Extracts the exchange name from a message. **Compilation flags:** `static` **Template:** `message_exchange(Message,Exchange)` **Mode and number of proofs:** `message_exchange(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `message_routing_key/2` Extracts the routing key from a message. **Compilation flags:** `static` **Template:** `message_routing_key(Message,RoutingKey)` **Mode and number of proofs:** `message_routing_key(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `encode_frame/2` Encodes an AMQP frame to a list of bytes. **Compilation flags:** `static` **Template:** `encode_frame(Frame,Bytes)` **Mode and number of proofs:** `encode_frame(+compound,-list)` - `one` ------------------------------------------------------------------------ ###### `decode_frame/2` Decodes a list of bytes to an AMQP frame. **Compilation flags:** `static` **Template:** `decode_frame(Bytes,Frame)` **Mode and number of proofs:** `decode_frame(+list,-compound)` - `one_or_error` **Exceptions:** `Bytes` do not encode a valid complete AMQP frame payload: `error` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `decode_field_value/3` Decodes one AMQP field-table value from a byte list, returning the normalized typed value plus the remaining undecoded bytes. **Compilation flags:** `static` **Template:** `decode_field_value(Bytes,Value,Rest)` **Mode and number of proofs:** `decode_field_value(+list(integer),-compound,-list(integer))` - `one_or_error` **Exceptions:** `Bytes` do not start with a supported AMQP field-table value encoding: `error` ------------------------------------------------------------------------ ##### Operators (none) **category** #### `amqp_pool` AMQP connection pool category. Import this category into an object to create a named connection pool with automatic connection management. **Availability:** `logtalk_load(amqp(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-06-16 **Compilation flags:** `static` **Extends:** `public` options **Uses:** amqp list os **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `initialize/1` - `destroy/0` - `acquire/1` - `release/1` - `with_connection/1` - `stats/1` - `resize/2` - Protected predicates - Private predicates - `pool_config/5` - `available/1` - `in_use/2` - Operators ##### Public predicates ###### `initialize/1` Initializes the connection pool with the given configuration options. Must be called before using other pool predicates. **Compilation flags:** `static` **Template:** `initialize(Options)` **Mode and number of proofs:** `initialize(+list)` - `one_or_error` **Exceptions:** `Options` configure a minimum pool size greater than the maximum pool size: `pool_error(invalid_config(min_size`` ``>`` ``max_size))` **Remarks:** > - Option host(Host): AMQP server hostname. Default is localhost. > > - Option port(Port): AMQP server port. Default is 5672. > > - Option min_size(N): Minimum number of connections to maintain. Default is 1. > > - Option max_size(N): Maximum number of connections allowed. Default is 10. > > - Option connection_options(Options): Options passed to amqp::connect/4. Default is \[\]. ------------------------------------------------------------------------ ###### `destroy/0` Destroys the pool, closing all connections and clearing state. **Compilation flags:** `static` **Mode and number of proofs:** `destroy` - `one` ------------------------------------------------------------------------ ###### `acquire/1` Acquires a connection from the pool. Returns an available connection or creates a new one if the pool is not at maximum capacity. **Compilation flags:** `static` **Template:** `acquire(Connection)` **Mode and number of proofs:** `acquire(--compound)` - `one_or_error` **Exceptions:** Pool not initialized: `pool_error(not_initialized)` Pool exhausted (at max capacity): `pool_error(exhausted)` ------------------------------------------------------------------------ ###### `release/1` Releases a connection back to the pool, making it available for reuse. **Compilation flags:** `static` **Template:** `release(Connection)` **Mode and number of proofs:** `release(+compound)` - `one` ------------------------------------------------------------------------ ###### `with_connection/1` Acquires a connection, calls Goal with the connection as argument, and releases the connection. The connection is released even if Goal fails or throws an exception. **Compilation flags:** `static` **Template:** `with_connection(Goal)` **Meta-predicate template:** `with_connection(1)` **Mode and number of proofs:** `with_connection(+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `stats/1` Returns pool statistics as a compound term stats(Available, InUse, Total, MinSize, MaxSize). **Compilation flags:** `static` **Template:** `stats(Stats)` **Mode and number of proofs:** `stats(-compound)` - `one` ------------------------------------------------------------------------ ###### `resize/2` Resizes the pool by setting new minimum and maximum sizes. **Compilation flags:** `static` **Template:** `resize(MinSize,MaxSize)` **Mode and number of proofs:** `resize(+integer,+integer)` - `one_or_error` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `pool_config/5` Stores the pool configuration parameters. **Compilation flags:** `dynamic` **Template:** `pool_config(Host,Port,MinSize,MaxSize,ConnectionOptions)` **Mode and number of proofs:** `pool_config(?atom,?integer,?integer,?integer,?list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `available/1` Tracks connections that are available for use. **Compilation flags:** `dynamic` **Template:** `available(Connection)` **Mode and number of proofs:** `available(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `in_use/2` Tracks connections currently in use along with their acquisition timestamp. **Compilation flags:** `dynamic` **Template:** `in_use(Connection,AcquireTimestamp)` **Mode and number of proofs:** `in_use(?compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### anomaly_detection_protocols") **protocol** #### `anomaly_dataset_protocol` Protocol for datasets used with anomaly-detection algorithms. **Availability:** `logtalk_load(anomaly_detection_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-19 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `attribute_values/2` - `class/1` - `class_values/1` - `example/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `attribute_values/2` Enumerates by backtracking the attributes and their possible values. For discrete attributes, `Values` is a list of possible values. For continuous attributes, `Values` is the atom `continuous`. **Compilation flags:** `static` **Template:** `attribute_values(Attribute,Values)` **Mode and number of proofs:** `attribute_values(?atom,-list(atom))` - `zero_or_more` `attribute_values(?atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `class/1` Returns the name of the target label attribute. **Compilation flags:** `static` **Template:** `class(Class)` **Mode and number of proofs:** `class(-atom)` - `one` ------------------------------------------------------------------------ ###### `class_values/1` Returns the list of possible labels for the target attribute. Current anomaly benchmarks conventionally use `[normal,`` ``anomaly]`. **Compilation flags:** `static` **Template:** `class_values(Values)` **Mode and number of proofs:** `class_values(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `example/3` Enumerates by backtracking the examples in the dataset. Each example has an `Id`, a `Class` label, and a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `example(Id,Class,AttributeValues)` **Mode and number of proofs:** `example(-integer,-atom,-list(pair))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `anomaly_detector_common` Shared predicates for anomaly detector learning defaults, threshold-based prediction, baseline training-data selection, dataset helpers, and export. **Availability:** `logtalk_load(anomaly_detection_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-01 **Compilation flags:** `static` **Implements:** `public` anomaly_detector_protocol **Extends:** `public` options **Uses:** format list type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  score/3  score_all/3  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `anomaly_detector_diagnostics_data/2` - `anomaly_detector_export_template/2` - `anomaly_detector_term_template/2` - `dataset_attributes/2` - `check_examples_non_empty/2` - `baseline_training_examples/3` - `valid_baseline_class_values/1` - `extract_scores/2` - `print_anomaly_detector_template/1` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `anomaly_detector_diagnostics_data/2` Hook predicate that importing anomaly detector implementations may override in order to expose diagnostics and metadata for learned detectors. **Compilation flags:** `static` **Template:** `anomaly_detector_diagnostics_data(AnomalyDetector,Diagnostics)` **Mode and number of proofs:** `anomaly_detector_diagnostics_data(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `anomaly_detector_export_template/2` Hook predicate that importing anomaly detector implementations must define in order to expose the exported detector predicate template for a given functor. **Compilation flags:** `static` **Template:** `anomaly_detector_export_template(Functor,Template)` **Mode and number of proofs:** `anomaly_detector_export_template(+atom,-callable)` - `one` ------------------------------------------------------------------------ ###### `anomaly_detector_term_template/2` Hook predicate that importing anomaly detector implementations must define in order to expose the learned detector term template used by pretty-printing helpers. **Compilation flags:** `static` **Template:** `anomaly_detector_term_template(AnomalyDetector,Template)` **Mode and number of proofs:** `anomaly_detector_term_template(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `dataset_attributes/2` Collects the dataset attribute declarations as Attribute-Values pairs. **Compilation flags:** `static` **Template:** `dataset_attributes(Dataset,Attributes)` **Mode and number of proofs:** `dataset_attributes(+object_identifier,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `check_examples_non_empty/2` Checks that a dataset contains at least one example. **Compilation flags:** `static` **Template:** `check_examples_non_empty(Dataset,Examples)` **Mode and number of proofs:** `check_examples_non_empty(+object_identifier,+list)` - `one` ------------------------------------------------------------------------ ###### `baseline_training_examples/3` Collects training examples selected by the `baseline_class_values/1` and `baseline_selection_policy/1` options. The `reject` policy throws an error when non-baseline examples are present. The `filter` policy removes non-baseline examples and throws an error when no baseline examples remain. **Compilation flags:** `static` **Template:** `baseline_training_examples(Dataset,Examples,Options)` **Mode and number of proofs:** `baseline_training_examples(+object_identifier,-list,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `valid_baseline_class_values/1` Checks that a `baseline_class_values/1` option value is a non-empty list of distinct atoms. **Compilation flags:** `static` **Template:** `valid_baseline_class_values(BaselineClassValues)` **Mode and number of proofs:** `valid_baseline_class_values(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `extract_scores/2` Transforms Score-Id-Class tuples into the public Id-Class-Score representation. **Compilation flags:** `static` **Template:** `extract_scores(Pairs,Scores)` **Mode and number of proofs:** `extract_scores(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `print_anomaly_detector_template/1` Prints the learned anomaly detector term template in a human-readable form. **Compilation flags:** `static` **Template:** `print_anomaly_detector_template(AnomalyDetector)` **Mode and number of proofs:** `print_anomaly_detector_template(+compound)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `anomaly_detector_protocol` Protocol for machine learning anomaly detectors. **Availability:** `logtalk_load(anomaly_detection_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `learn/2` - `learn/3` - `check_anomaly_detector/1` - `valid_anomaly_detector/1` - `diagnostics/2` - `diagnostic/2` - `anomaly_detector_options/2` - `predict/3` - `predict/4` - `score/3` - `score_all/3` - `export_to_clauses/4` - `export_to_file/4` - `print_anomaly_detector/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `learn/2` Learns an anomaly detector from the given dataset object. **Compilation flags:** `static` **Template:** `learn(Dataset,AnomalyDetector)` **Mode and number of proofs:** `learn(+object_identifier,-compound)` - `one` ------------------------------------------------------------------------ ###### `learn/3` Learns an anomaly detector from the given dataset object using the specified options. **Compilation flags:** `static` **Template:** `learn(Dataset,AnomalyDetector,Options)` **Mode and number of proofs:** `learn(+object_identifier,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `check_anomaly_detector/1` Checks that a learned anomaly detector term is structurally valid for the receiving implementation. Throws an exception when the term is not a valid anomaly detector representation. **Compilation flags:** `static` **Template:** `check_anomaly_detector(AnomalyDetector)` **Mode and number of proofs:** `check_anomaly_detector(@compound)` - `one_or_error` **Exceptions:** `AnomalyDetector` is a variable: `instantiation_error` `AnomalyDetector` is neither a variable nor a valid anomaly detector: `domain_error(anomaly_detector,AnomalyDetector)` ------------------------------------------------------------------------ ###### `valid_anomaly_detector/1` True when a learned anomaly detector term is structurally valid for the receiving implementation. Succeeds iff `check_anomaly_detector/1` succeeds without throwing an exception. **Compilation flags:** `static` **Template:** `valid_anomaly_detector(AnomalyDetector)` **Mode and number of proofs:** `valid_anomaly_detector(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `diagnostics/2` Returns diagnostics and metadata associated with a learned anomaly detector in a representation-independent way. **Compilation flags:** `static` **Template:** `diagnostics(AnomalyDetector,Diagnostics)` **Mode and number of proofs:** `diagnostics(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostic/2` Tests or enumerates individual diagnostics metadata terms for a learned anomaly detector. **Compilation flags:** `static` **Template:** `diagnostic(AnomalyDetector,Diagnostic)` **Mode and number of proofs:** `diagnostic(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `anomaly_detector_options/2` Returns the effective training options recorded in a learned anomaly detector. **Compilation flags:** `static` **Template:** `anomaly_detector_options(AnomalyDetector,Options)` **Mode and number of proofs:** `anomaly_detector_options(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `predict/3` Predicts whether a new instance is `normal` or `anomaly` using the learned detector. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict(AnomalyDetector,Instance,Prediction)` **Mode and number of proofs:** `predict(+compound,+list,-atom)` - `one` ------------------------------------------------------------------------ ###### `predict/4` Predicts whether a new instance is `normal` or `anomaly` using the learned detector and the specified options. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict(AnomalyDetector,Instance,Prediction,Options)` **Mode and number of proofs:** `predict(+compound,+list,-atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `score/3` Computes an anomaly score in the interval `[0.0,`` ``1.0]` for a new instance. Larger scores indicate more anomalous instances. **Compilation flags:** `static` **Template:** `score(AnomalyDetector,Instance,Score)` **Mode and number of proofs:** `score(+compound,+list,-float)` - `one` ------------------------------------------------------------------------ ###### `score_all/3` Computes anomaly scores for all examples in a dataset and returns a list of `Id-Class-Score` triples sorted by descending score. **Compilation flags:** `static` **Template:** `score_all(Dataset,AnomalyDetector,Scores)` **Mode and number of proofs:** `score_all(+object_identifier,+compound,-list)` - `one` ------------------------------------------------------------------------ ###### `export_to_clauses/4` Converts an anomaly detector into a list of predicate clauses. `Functor` is the functor for the generated predicate clauses. When exporting a serialized detector term, a noun such as `detector` or `model` is usually clearer than a verb such as `detect`. **Compilation flags:** `static` **Template:** `export_to_clauses(Dataset,AnomalyDetector,Functor,Clauses)` **Mode and number of proofs:** `export_to_clauses(+object_identifier,+compound,+callable,-list(clause))` - `one` ------------------------------------------------------------------------ ###### `export_to_file/4` Exports an anomaly detector to a file. `Functor` is the functor for the generated predicate clauses. When exporting a serialized detector term, a noun such as `detector` or `model` is usually clearer than a verb such as `detect`. **Compilation flags:** `static` **Template:** `export_to_file(Dataset,AnomalyDetector,Functor,File)` **Mode and number of proofs:** `export_to_file(+object_identifier,+compound,+callable,+atom)` - `one` ------------------------------------------------------------------------ ###### `print_anomaly_detector/1` Prints an anomaly detector to the current output stream in a human-readable format. **Compilation flags:** `static` **Template:** `print_anomaly_detector(AnomalyDetector)` **Mode and number of proofs:** `print_anomaly_detector(+compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_common, isolation_forest_anomaly_detector, knn_distance_anomaly_detector, lof_anomaly_detector ### application") **category** #### `application_common` Application metadata and provenance predicates. **Availability:** `logtalk_load(application(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-03-25 **Compilation flags:** `static` **Implements:** `public` application_protocol **Uses:** os **Remarks:** (none) **Inherited public predicates:**  built_date/1  creators/1  description/1  distribution/1  external_reference/2  git_object_identifier/1  homepage/1  license/1  loader_file/1  name/1  originator/1  package/1  property/1  release_date/1  repository/1  repository_branch/1  repository_commit/1  repository_commit_abbreviated/1  repository_commit_author/1  repository_commit_date/1  repository_commit_message/1  software_heritage_identifier/1  supplier/1  valid_until_date/1  version/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `application_protocol` Application metadata predicates, including optional source provenance facts. **Availability:** `logtalk_load(application(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-03-25 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Explicit metadata: All predicates describe metadata declared by the application. The protocol does not require or imply reflection over the current and transient state of some application repository. > > - Release metadata: Predicates such as `name/1`, `version/1`, `description/1`, `license/1`, `distribution/1`, `package/1`, `release_date/1`, and `valid_until_date/1` are intended for release-oriented metadata. > > - Source provenance metadata: Predicates such as `repository/1`, `repository_branch/1`, `repository_commit/1`, `repository_commit_date/1`, `repository_commit_author/1`, `repository_commit_message/1`, `git_object_identifier/1`, and `software_heritage_identifier/1` are optional explicit provenance facts about the source used for the application and may or may not correspond to the release artifact identity. **Inherited public predicates:** (none) - Public predicates - `name/1` - `version/1` - `description/1` - `license/1` - `homepage/1` - `distribution/1` - `package/1` - `loader_file/1` - `creators/1` - `supplier/1` - `originator/1` - `built_date/1` - `release_date/1` - `valid_until_date/1` - `external_reference/2` - `repository/1` - `repository_branch/1` - `repository_commit/1` - `repository_commit_abbreviated/1` - `repository_commit_date/1` - `repository_commit_author/1` - `repository_commit_message/1` - `git_object_identifier/1` - `software_heritage_identifier/1` - `property/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `name/1` Application name. **Compilation flags:** `static` **Template:** `name(Name)` **Mode and number of proofs:** `name(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `version/1` Application version. **Compilation flags:** `static` **Template:** `version(Version)` **Mode and number of proofs:** `version(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `description/1` Application short description. **Compilation flags:** `static` **Template:** `description(Description)` **Mode and number of proofs:** `description(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `license/1` Application license. **Compilation flags:** `static` **Template:** `license(License)` **Mode and number of proofs:** `license(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `homepage/1` Application homepage URL. **Compilation flags:** `static` **Template:** `homepage(URL)` **Mode and number of proofs:** `homepage(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distribution/1` Application distribution or download location. **Compilation flags:** `static` **Template:** `distribution(URL)` **Mode and number of proofs:** `distribution(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `package/1` Application package identifier as a PURL. **Compilation flags:** `static` **Template:** `package(PURL)` **Mode and number of proofs:** `package(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `loader_file/1` Application main loader file absolute path. **Compilation flags:** `static` **Template:** `loader_file(File)` **Mode and number of proofs:** `loader_file(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `creators/1` Application creators, authors, or other credited producers of the application or its release metadata. **Compilation flags:** `static` **Template:** `creators(Creators)` **Mode and number of proofs:** `creators(?list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `supplier/1` Application supplier. **Compilation flags:** `static` **Template:** `supplier(Supplier)` **Mode and number of proofs:** `supplier(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `originator/1` Original source of the application software when distinct from its creators. **Compilation flags:** `static` **Template:** `originator(Originator)` **Mode and number of proofs:** `originator(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `built_date/1` Application build date. **Compilation flags:** `static` **Template:** `built_date(Date)` **Mode and number of proofs:** `built_date(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `release_date/1` Application release date. **Compilation flags:** `static` **Template:** `release_date(Date)` **Mode and number of proofs:** `release_date(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_until_date/1` Application validity limit date. **Compilation flags:** `static` **Template:** `valid_until_date(Date)` **Mode and number of proofs:** `valid_until_date(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `external_reference/2` Application explicit external references using the same vocabulary as the corresponding first-class metadata predicates. The second argument can be a URL or a non-URL identifier depending on the reference type. **Compilation flags:** `static` **Template:** `external_reference(Type,Locator)` **Mode and number of proofs:** `external_reference(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `repository/1` Application source provenance repository metadata. **Compilation flags:** `static` **Template:** `repository(URL)` **Mode and number of proofs:** `repository(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `repository_branch/1` Application source provenance git branch metadata. **Compilation flags:** `static` **Template:** `repository_branch(Branch)` **Mode and number of proofs:** `repository_branch(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `repository_commit/1` Application source provenance git commit metadata. **Compilation flags:** `static` **Template:** `repository_commit(Hash)` **Mode and number of proofs:** `repository_commit(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `repository_commit_abbreviated/1` Application abbreviated source provenance git commit metadata. **Compilation flags:** `static` **Template:** `repository_commit_abbreviated(Hash)` **Mode and number of proofs:** `repository_commit_abbreviated(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `repository_commit_date/1` Application source provenance git commit date metadata. **Compilation flags:** `static` **Template:** `repository_commit_date(Date)` **Mode and number of proofs:** `repository_commit_date(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `repository_commit_author/1` Application source provenance git commit author metadata. **Compilation flags:** `static` **Template:** `repository_commit_author(Author)` **Mode and number of proofs:** `repository_commit_author(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `repository_commit_message/1` Application source provenance git commit message metadata. **Compilation flags:** `static` **Template:** `repository_commit_message(Message)` **Mode and number of proofs:** `repository_commit_message(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `git_object_identifier/1` Application source provenance git object identifier metadata as a gitoid. **Compilation flags:** `static` **Template:** `git_object_identifier(GITOID)` **Mode and number of proofs:** `git_object_identifier(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `software_heritage_identifier/1` Application source provenance Software Heritage identifier metadata as an SWHID. **Compilation flags:** `static` **Template:** `software_heritage_identifier(SWHID)` **Mode and number of proofs:** `software_heritage_identifier(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `property/1` Enumerates declared application metadata and optional source provenance as individual property terms. **Compilation flags:** `static` **Template:** `property(Property)` **Mode and number of proofs:** `property(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### apriori_pattern_miner") **object** #### `apriori_pattern_miner` Apriori frequent itemset miner for transaction datasets using deterministic level-wise candidate generation and anti-monotone pruning. **Availability:** `logtalk_load(apriori_pattern_miner(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` frequent_pattern_mining_common **Uses:** avltree combinations fnv1a_32 format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pattern_miner_protocol, transaction_dataset_protocol, combinations ### arbitrary") **category** #### `arbitrary` Adds predicates for generating and shrinking random values for selected types to the library `type` object. User extensible. **Availability:** `logtalk_load(arbitrary(loader))` **Author:** Paulo Moura **Version:** 2:38:0 **Date:** 2026-02-28 **Compilation flags:** `static` **Complements:** type **Uses:** fast_random integer list type **Remarks:** > - Logtalk specific types: `entity`, `object`, `protocol`, `category`, `entity_identifier`, `object_identifier`, `protocol_identifier`, `category_identifier`, `event`, `predicate`. > > - Prolog module related types (when the backend compiler supports modules): `module`, `module_identifier`, `qualified_callable`. > > - Prolog base types: `term`, `var`, `nonvar`, `atomic`, `atom`, `number`, `integer`, `float`, `compound`, `callable`, `ground`. > > - Atom derived types: `non_quoted_atom`, `non_empty_atom`, `non_empty_atom(CharSet)`, `boolean`, `character`, `in_character`, `char`, `operator_specifier`, `hex_char`. > > - Atom derived parametric types: `atom(CharSet)`, `atom(CharSet,Length)`, `non_empty_atom(CharSet)`, `character(CharSet)`, `in_character(CharSet)`, `char(CharSet)`. > > - Number derived types: `positive_number`, `negative_number`, `non_positive_number`, `non_negative_number`. > > - Float derived types: `positive_float`, `negative_float`, `non_positive_float`, `non_negative_float`, `probability`. > > - Integer derived types: `positive_integer`, `negative_integer`, `non_positive_integer`, `non_negative_integer`, `byte`, `in_byte`, `character_code`, `in_character_code`, `code`, `operator_priority`, `hex_code`. > > - Integer derived parametric types: `character_code(CharSet)`, `in_character_code(CharSet)`, `code(CharSet)`. > > - List types (compound derived types): `list`, `non_empty_list`, `partial_list`, `list_or_partial_list`, `list(Type)`, `list(Type,Length)`, `list(Type,Min,Max)`, `list(Type,Length,Min,Max)`, `non_empty_list(Type)`, `codes`, `chars`. > > - Difference list types (compound derived types): `difference_list`, `difference_list(Type)`. > > - List and difference list types length: The types that do not take a fixed length generate lists with a length in the `[0,MaxSize]` interval (`[1,MaxSize]` for non-empty list types). > > - Predicate and non-terminal indicator types arity: These types generate indicators with an arity in the `[0,MaxSize]` interval. > > - Other compound derived types: `compound(Name,Types)`, `predicate_indicator`, `non_terminal_indicator`, `predicate_or_non_terminal_indicator`, `clause`, `grammar_rule`, `pair`, `pair(KeyType,ValueType)`. > > - Other types: `text`, `text(CharSet)`, `Object::Closure`, `between(Type,Lower,Upper)`, `property(Type,LambdaExpression)`, `one_of(Type,Set)`, `var_or(Type)`, `ground(Type)`, `types(Types)`, `types_frequency(Pairs)`, `transform(Type,Closure)`, `constrain(Type,Closure)`. > > - Types `text` and `text(CharSet)` notes: Generate random text represented using either atoms, character lists, or character code lists. > > - Type `Object::Closure` notes: Allows calling public object predicates as generators and shrinkers. The `Closure` closure is extended with either a single argument, the generated arbitrary value, or with two arguments, when shrinking a value. > > - Type `compound(Name,Types)` notes: Generate a random compound term with the given name with a random argument for each type. > > - Type `types_frequency(Pairs)` notes: Generate a random term for one of the types in a list of `Type-Frequency` pairs. The type is randomly selected taking into account the types frequency. > > - Type `transform(Type,Closure)` notes: Generate a random term by transforming the term generated for the given type using the given closure. > > - Type `constrain(Type,Closure)` notes: Generate a random term for the given type that satisfy the given closure. > > - Registering new types: Add clauses for the `arbitrary/1-2` multifile predicates and optionally for the `shrinker/1` and `shrink/3` multifile predicates. The clauses must have a bound first argument to avoid introducing spurious choice-points. > > - Shrinking values: The `shrink/3` should either succeed or fail but never throw an exception. > > - Character sets: `ascii_identifier`, `ascii_printable`, `ascii_full`, `hexadecimal`, `byte`, `unicode_bmp`, `unicode_full`. > > - Default character sets: The default character set when using a parameterizable type that takes a character set parameter depends on the type. > > - Default character sets: Entity, predicate, and non-terminal identifier types plus compound and callable types default to an `ascii_identifier` functor. Character and character code types default to `ascii_full`. Other types default to `ascii_printable`. > > - Caveats: The type argument (and any type parameterization) to the predicates is not type-checked (or checked for consistency) for performance reasons. > > - Unicode limitations: Currently, correct character/code generation is only ensured for SWI-Prolog and XVM as other backends do not provide support for querying a Unicode code point category. **Inherited public predicates:** (none) - Public predicates - `arbitrary/1` - `arbitrary/2` - `shrinker/1` - `shrink/3` - `shrink_sequence/3` - `edge_case/2` - `get_seed/1` - `set_seed/1` - `max_size/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `arbitrary/1` Table of defined types for which an arbitrary value can be generated. A new type can be registered by defining a clause for this predicate and adding a clause for the `arbitrary/2` multifile predicate. **Compilation flags:** `static,`` ``multifile` **Template:** `arbitrary(Type)` **Mode and number of proofs:** `arbitrary(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `arbitrary/2` Generates an arbitrary term of the specified type. Fails if the type is not supported. A new generator can be defined by adding a clause for this predicate and registering it via the `arbitrary/1` predicate. **Compilation flags:** `static,`` ``multifile` **Template:** `arbitrary(Type,Term)` **Meta-predicate template:** `arbitrary(::,*)` **Mode and number of proofs:** `arbitrary(@callable,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `shrinker/1` Table of defined types for which a shrinker is provided. A new shrinker can be registered by defining a clause for this predicate and adding a definition for the `shrink/3` multifile predicate. **Compilation flags:** `static,`` ``multifile` **Template:** `shrinker(Type)` **Mode and number of proofs:** `shrinker(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `shrink/3` Shrinks a value to a smaller value if possible. Must generate a finite number of solutions. Fails if the type is not supported. A new shrinker can be defined by adding a clause for this predicate and registering it via the `shrinker/1` predicate. **Compilation flags:** `static,`` ``multifile` **Template:** `shrink(Type,Large,Small)` **Mode and number of proofs:** `shrink(@callable,@term,-term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `shrink_sequence/3` Shrinks a value repeatedly until shrinking is no longer possible returning the sequence of values (ordered from larger to smaller value). Fails if the type is not supported. **Compilation flags:** `static` **Template:** `shrink_sequence(Type,Value,Sequence)` **Mode and number of proofs:** `shrink_sequence(@callable,@term,-list(term))` - `zero_or_one` ------------------------------------------------------------------------ ###### `edge_case/2` Table of type edge cases. Fails if the given type have no defined edge cases. New edge cases for existing or new types can be added by defining a clause for this multifile predicate. **Compilation flags:** `static,`` ``multifile` **Template:** `edge_case(Type,Term)` **Mode and number of proofs:** `edge_case(?callable,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `get_seed/1` Gets the current random generator seed. Seed should be regarded as an opaque ground term. **Compilation flags:** `static` **Template:** `get_seed(Seed)` **Mode and number of proofs:** `get_seed(-ground)` - `one` ------------------------------------------------------------------------ ###### `set_seed/1` Sets the random generator seed to a given value returned by calling the `get_seed/1` predicate. **Compilation flags:** `static` **Template:** `set_seed(Seed)` **Mode and number of proofs:** `set_seed(+ground)` - `one` ------------------------------------------------------------------------ ###### `max_size/1` User defined maximum size for types where its meaningful and implicit. When not defined, defaults to 42. When multiple definitions exist, the first valid one found is used. **Compilation flags:** `static,`` ``multifile` **Template:** `max_size(Size)` **Mode and number of proofs:** `max_size(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also type ### arrangements") **object** #### `arrangements` Implementation of arrangements operations with repetition over lists. **Availability:** `logtalk_load(arrangements(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` arrangements_protocol **Uses:** fast_random(Algorithm) list **Remarks:** (none) **Inherited public predicates:**  arrangement/3  arrangement/4  arrangement_index/4  arrangement_index/5  arrangements/3  arrangements/4  count_arrangements/3  count_distinct_arrangements/3  distinct_arrangement/3  distinct_arrangement/4  distinct_arrangement_index/4  distinct_arrangements/3  distinct_arrangements/4  next_arrangement/3  nth_arrangement/4  nth_arrangement/5  nth_distinct_arrangement/4  previous_arrangement/3  random_arrangement/3  random_distinct_arrangement/3  sample_arrangements/4  sample_distinct_arrangements/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `arrangements_protocol` Protocol for arrangements operations over lists. **Availability:** `logtalk_load(arrangements(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-12 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `arrangements/3` - `arrangement/3` - `arrangements/4` - `arrangement/4` - `distinct_arrangements/3` - `distinct_arrangement/3` - `distinct_arrangements/4` - `distinct_arrangement/4` - `nth_arrangement/4` - `nth_arrangement/5` - `arrangement_index/4` - `arrangement_index/5` - `count_arrangements/3` - `count_distinct_arrangements/3` - `nth_distinct_arrangement/4` - `distinct_arrangement_index/4` - `random_arrangement/3` - `sample_arrangements/4` - `random_distinct_arrangement/3` - `sample_distinct_arrangements/4` - `next_arrangement/3` - `previous_arrangement/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `arrangements/3` Generates all K-arrangements (ordered K-element selections with replacement) of a list using default order. **Compilation flags:** `static` **Template:** `arrangements(K,List,Arrangements)` **Mode and number of proofs:** `arrangements(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `arrangement/3` True iff the third argument is a K-arrangement with replacement of a list using default order. **Compilation flags:** `static` **Template:** `arrangement(K,List,Arrangement)` **Mode and number of proofs:** `arrangement(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `arrangements/4` Generates all K-arrangements with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `arrangements(K,List,Order,Arrangements)` **Mode and number of proofs:** `arrangements(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `arrangement/4` True iff the fourth argument is a K-arrangement with replacement with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `arrangement(K,List,Order,Arrangement)` **Mode and number of proofs:** `arrangement(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_arrangements/3` Generates all distinct K-arrangements (deduplicating repeated values in the input list) using default order. **Compilation flags:** `static` **Template:** `distinct_arrangements(K,List,Arrangements)` **Mode and number of proofs:** `distinct_arrangements(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_arrangement/3` True iff the third argument is a distinct K-arrangement with replacement of a list using default order. **Compilation flags:** `static` **Template:** `distinct_arrangement(K,List,Arrangement)` **Mode and number of proofs:** `distinct_arrangement(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_arrangements/4` Generates all distinct K-arrangements with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_arrangements(K,List,Order,Arrangements)` **Mode and number of proofs:** `distinct_arrangements(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_arrangement/4` True iff the fourth argument is a distinct K-arrangement with replacement with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_arrangement(K,List,Order,Arrangement)` **Mode and number of proofs:** `distinct_arrangement(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `nth_arrangement/4` Returns the K-arrangement at a given zero-based index using default order. **Compilation flags:** `static` **Template:** `nth_arrangement(K,List,Index,Arrangement)` **Mode and number of proofs:** `nth_arrangement(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_arrangement/5` Returns the K-arrangement at a given zero-based index in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `nth_arrangement(K,List,Order,Index,Arrangement)` **Mode and number of proofs:** `nth_arrangement(+integer,+list,+atom,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `arrangement_index/4` Returns the zero-based index of a K-arrangement using default order. **Compilation flags:** `static` **Template:** `arrangement_index(K,List,Arrangement,Index)` **Mode and number of proofs:** `arrangement_index(+integer,+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `arrangement_index/5` Returns the zero-based index of a K-arrangement in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `arrangement_index(K,List,Order,Arrangement,Index)` **Mode and number of proofs:** `arrangement_index(+integer,+list,+atom,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `count_arrangements/3` Counts the number of K-arrangements with replacement of a list. **Compilation flags:** `static` **Template:** `count_arrangements(K,List,Count)` **Mode and number of proofs:** `count_arrangements(+integer,+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `count_distinct_arrangements/3` Counts the number of distinct K-arrangements with replacement of a list (deduplicating repeated values in the input list). **Compilation flags:** `static` **Template:** `count_distinct_arrangements(K,List,Count)` **Mode and number of proofs:** `count_distinct_arrangements(+integer,+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `nth_distinct_arrangement/4` Returns the distinct K-arrangement at a given zero-based index in default generation order. **Compilation flags:** `static` **Template:** `nth_distinct_arrangement(K,List,Index,Arrangement)` **Mode and number of proofs:** `nth_distinct_arrangement(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_arrangement_index/4` Returns the zero-based index of a distinct K-arrangement in default generation order. **Compilation flags:** `static` **Template:** `distinct_arrangement_index(K,List,Arrangement,Index)` **Mode and number of proofs:** `distinct_arrangement_index(+integer,+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_arrangement/3` Returns a random K-arrangement with replacement of a list. **Compilation flags:** `static` **Template:** `random_arrangement(K,List,Arrangement)` **Mode and number of proofs:** `random_arrangement(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_arrangements/4` Returns SampleCount random K-arrangements with replacement of a list, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_arrangements(K,List,SampleCount,Samples)` **Mode and number of proofs:** `sample_arrangements(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_distinct_arrangement/3` Returns a random distinct K-arrangement with replacement of a list (deduplicating repeated values in the input list). **Compilation flags:** `static` **Template:** `random_distinct_arrangement(K,List,Arrangement)` **Mode and number of proofs:** `random_distinct_arrangement(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_distinct_arrangements/4` Returns SampleCount random distinct K-arrangements with replacement of a list, sampled with replacement after deduplicating repeated values in the input list. **Compilation flags:** `static` **Template:** `sample_distinct_arrangements(K,List,SampleCount,Samples)` **Mode and number of proofs:** `sample_distinct_arrangements(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next_arrangement/3` Returns the next distinct arrangement value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `next_arrangement(List,Arrangement,Next)` **Mode and number of proofs:** `next_arrangement(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_arrangement/3` Returns the previous distinct arrangement value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `previous_arrangement(List,Arrangement,Previous)` **Mode and number of proofs:** `previous_arrangement(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### assertions") **object** #### `assertions` Proxy object for simplifying the use of the assertion meta-predicates. **Availability:** `logtalk_load(assertions(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2014-04-03 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` assertions(\_) **Remarks:** (none) **Inherited public predicates:**  assertion/1  assertion/2  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `assertions(Mode)` A simple assertions framework. Can be used as a hook object for either suppressing assertions (`production` mode) or expanding them with file context information (`debug` mode). **Availability:** `logtalk_load(assertions(loader))` **Author:** Paulo Moura **Version:** 2:2:2 **Date:** 2022-07-04 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Uses:** logtalk **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - `assertion/1` - `assertion/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `assertion/1` Checks that an assertion is true. Uses the structured message printing mechanism for printing the results using a silent message for assertion success and a error message for assertion failure. **Compilation flags:** `static` **Template:** `assertion(Goal)` **Meta-predicate template:** `assertion(0)` **Mode and number of proofs:** `assertion(@callable)` - `one` ------------------------------------------------------------------------ ###### `assertion/2` Checks that an assertion is true. Uses the structured message printing mechanism for printing the results using a silent message for assertion success and a error message for assertion failure. The context argument can be used to e.g. pass location data. **Compilation flags:** `static` **Template:** `assertion(Context,Goal)` **Meta-predicate template:** `assertion(*,0)` **Mode and number of proofs:** `assertion(@term,@callable)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `assertions_messages` Assertions framework default message translations. **Availability:** `logtalk_load(assertions(loader))` **Author:** Paulo Moura **Version:** 2:2:0 **Date:** 2018-02-20 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### assignvars") **object** #### `assignvars` Assignable variables (supporting backtracable assignment of non-variable terms). **Availability:** `logtalk_load(assignvars(loader))` **Author:** Nobukuni Kino and Paulo Moura **Version:** 1:7:0 **Date:** 2018-07-11 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` assignvarsp **Remarks:** (none) **Inherited public predicates:**  (\<=)/2  (=\>)/2  assignable/1  assignable/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `assignvarsp` Assignable variables (supporting backtracable assignment of non-variable terms) protocol. **Availability:** `logtalk_load(assignvars(loader))` **Author:** Nobukuni Kino and Paulo Moura **Version:** 1:0:1 **Date:** 2019-06-10 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `assignable/1` - `assignable/2` - `(<=)/2` - `(=>)/2` - Protected predicates - Private predicates - Operators - `op(100,xfx,<=)` - `op(100,xfx,=>)` ##### Public predicates ###### `assignable/1` Makes `Variable` an assignable variable. Initial state will be empty. **Compilation flags:** `static` **Template:** `assignable(Variable)` **Mode and number of proofs:** `assignable(--assignvar)` - `one` **Exceptions:** Variable is not a variable: `type_error(variable,Variable)` ------------------------------------------------------------------------ ###### `assignable/2` Makes `Variable` an assignable variable and sets its initial state to `Value`. **Compilation flags:** `static` **Template:** `assignable(Variable,Value)` **Mode and number of proofs:** `assignable(--assignvar,@nonvar)` - `one` **Exceptions:** Variable is not a variable: `type_error(variable,Variable)` Value is not instantiated: `instantiation_error` ------------------------------------------------------------------------ ###### `(<=)/2` Sets the state of the assignable variable `Variable` to `Value` (initializing the variable if needed). **Compilation flags:** `static` **Template:** `Variable<=Value` **Mode and number of proofs:** `(?assignvar)<=(@nonvar)` - `one` **Exceptions:** Value is not instantiated: `instantiation_error` ------------------------------------------------------------------------ ###### `(=>)/2` Unifies `Value` with the current state of the assignable variable `Variable`. **Compilation flags:** `static` **Template:** `Variable=>Value` **Mode and number of proofs:** `+assignvar=>`` ``?nonvar` - `zero_or_one` **Exceptions:** Variable is not instantiated: `instantiation_error` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators ###### `op(100,xfx,<=)` **Scope:** `public` ###### `op(100,xfx,=>)` **Scope:** `public` See also assignvars ### avro") **object** #### `avro` Apache Avro binary format parser and generator. **Availability:** `logtalk_load(avro(loader))` **Author:** Paulo Moura **Version:** 1:2:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ieee_754(Precision,ByteOrder,NaNRepresentation) json(ObjectRepresentation,PairRepresentation,StringRepresentation) list reader **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `parse/3` - `generate/3` - `generate/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses Avro binary data from the given source (`bytes(List)`, `stream(Stream)`, or `file(Path)`) returning a `Schema-Data` pair. When the schema is not present in the file, `Schema` is unified with `false`. **Compilation flags:** `static` **Template:** `parse(Source,Schema-Data)` **Mode and number of proofs:** `parse(++compound,--pair)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Avro source term: `domain_error(avro_source,Source)` ------------------------------------------------------------------------ ###### `parse/3` Parses Avro binary data from the given source using the provided schema, returning the decoded data. **Compilation flags:** `static` **Template:** `parse(Source,Schema,Data)` **Mode and number of proofs:** `parse(++compound,++term,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Avro source term: `domain_error(avro_source,Source)` ------------------------------------------------------------------------ ###### `generate/3` Generates Avro binary data to the given sink (`bytes(List)`, `stream(Stream)`, or `file(Path)`) from the given schema and data. The schema is not included in the output. **Compilation flags:** `static` **Template:** `generate(Sink,Schema,Data)` **Mode and number of proofs:** `generate(++compound,++term,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Avro sink term: `domain_error(avro_sink,Sink)` ------------------------------------------------------------------------ ###### `generate/4` Generates Avro binary data to the given sink from the given schema and data. When `IncludeSchema` is `true`, generates an Avro Object Container File with the schema embedded. **Compilation flags:** `static` **Template:** `generate(Sink,IncludeSchema,Schema,Data)` **Mode and number of proofs:** `generate(++compound,++boolean,++term,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Avro sink term: `domain_error(avro_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### base32") **object** #### `base32` Base32 encoder and decoder (RFC 4648). **Availability:** `logtalk_load(base32(loader))` **Author:** Paulo Moura **Version:** 1:0:2 **Date:** 2026-07-20 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** reader **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses Base32 data from the given source (`atom(Atom)`, `chars(List)`, `codes(List)`, `stream(Stream)`, or `file(Path)`) into a list of bytes. **Compilation flags:** `static` **Template:** `parse(Source,Bytes)` **Mode and number of proofs:** `parse(++compound,--list(byte))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Base32 source term: `domain_error(base32_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates Base32 in the representation specified in the first argument (`atom(Atom)`, `chars(List)`, `codes(List)`, `stream(Stream)`, or `file(Path)`) for the list of bytes in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Bytes)` **Mode and number of proofs:** `generate(+compound,+list(byte))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Base32 sink term: `domain_error(base32_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### base58") **object** #### `base58` Base58 encoder and decoder (Bitcoin alphabet variant). **Availability:** `logtalk_load(base58(loader))` **Author:** Paulo Moura **Version:** 1:1:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses Base58 data from the given source (`atom(Atom)`, `chars(List)`, or `codes(List)`) into a list of bytes. **Compilation flags:** `static` **Template:** `parse(Source,Bytes)` **Mode and number of proofs:** `parse(++compound,--list(byte))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Base58 source term: `domain_error(base58_source,Source)` `Source` contains Base58 data with characters outside the Base58 alphabet: `representation_error(base58)` ------------------------------------------------------------------------ ###### `generate/2` Generates Base58 in the representation specified in the first argument (`atom(Atom)`, `chars(List)`, or `codes(List)`) for the list of bytes in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Bytes)` **Mode and number of proofs:** `generate(+compound,+list(byte))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Base58 sink term: `domain_error(base58_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### base64") **object** #### `base64` Base64 parser and generator. **Availability:** `logtalk_load(base64(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** reader **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses the Base64 data from the given source (`atom(Atom)`, `chars(List)`, `codes(List)`, `stream(Stream)`, or `file(Path)` into a list of bytes. **Compilation flags:** `static` **Template:** `parse(Source,Bytes)` **Mode and number of proofs:** `parse(++compound,--list(byte))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Base64 source term: `domain_error(base64_source,Source)` `Source` contains Base64 data with characters outside the Base64 alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `generate/2` Generates Base64 in the representation specified in the first argument (`atom(Atom)`, `chars(List)`, `codes(List)`, `stream(Stream)`, or `file(Path)` for the list of bytes in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Bytes)` **Mode and number of proofs:** `generate(+compound,+list(byte))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Base64 sink term: `domain_error(base64_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `base64url` Base64URL parser and generator. **Availability:** `logtalk_load(base64(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses the Base64URL data from the given source (`atom(Atom)`, `chars(List)`, or `codes(List)` into a URL (using the same format as the source). **Compilation flags:** `static` **Template:** `parse(Source,URL)` **Mode and number of proofs:** `parse(++compound,--types([atom,chars,codes]))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Base64 source term: `domain_error(base64url_source,Source)` `Source` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `generate/2` Generates Base64URL data in the representation specified in the first argument (`atom(Atom)`, `chars(List)`, or `codes(List)` for the given URL (given in the same format as the sink). **Compilation flags:** `static` **Template:** `generate(Sink,URL)` **Mode and number of proofs:** `generate(+compound,+types([atom,chars,codes]))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Base64 sink term: `domain_error(base64url_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `base64url_no_padding` Base64URL parser and generator without padding. **Availability:** `logtalk_load(base64(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses the unpadded Base64URL data from the given source (`atom(Atom)`, `chars(List)`, or `codes(List)` into a URL (using the same format as the source). **Compilation flags:** `static` **Template:** `parse(Source,URL)` **Mode and number of proofs:** `parse(++compound,--types([atom,chars,codes]))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Base64URL source term: `domain_error(base64url_source,Source)` `Source` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `generate/2` Generates unpadded Base64URL data in the representation specified in the first argument (`atom(Atom)`, `chars(List)`, or `codes(List)` for the given URL (given in the same format as the sink). **Compilation flags:** `static` **Template:** `generate(Sink,URL)` **Mode and number of proofs:** `generate(+compound,+types([atom,chars,codes]))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Base64URL sink term: `domain_error(base64url_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### base85") **object** #### `base85` Base85 encoder and decoder (Ascii85/btoa variant). **Availability:** `logtalk_load(base85(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses Base85 (Ascii85) data from the given source (`atom(Atom)`, `chars(List)`, or `codes(List)`) into a list of bytes. **Compilation flags:** `static` **Template:** `parse(Source,Bytes)` **Mode and number of proofs:** `parse(++compound,--list(byte))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Base85 source term: `domain_error(base85_source,Source)` `Source` contains Base85 data with characters outside the Base85 alphabet: `representation_error(base85)` ------------------------------------------------------------------------ ###### `generate/2` Generates Base85 (Ascii85) in the representation specified in the first argument (`atom(Atom)`, `chars(List)`, or `codes(List)`) for the list of bytes in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Bytes)` **Mode and number of proofs:** `generate(+compound,+list(byte))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Base85 sink term: `domain_error(base85_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### bayesian_ridge_regression") **object** #### `bayesian_ridge_regression` Bayesian ridge regression regressor supporting continuous and mixed-feature datasets using evidence maximization and posterior uncertainty over coefficients. Learns from a dataset object implementing the `regression_dataset_protocol` protocol and returns a regressor term that can be used for prediction, predictive-distribution queries, and export as predicate clauses. **Availability:** `logtalk_load(bayesian_ridge_regression(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** format linear_algebra list numberlist population type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - `predict_distribution/3` - `weight_variances/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `predict_distribution/3` Predicts the posterior predictive Gaussian distribution for a new instance using the learned regressor. The returned term has the shape `gaussian(Mean,`` ``Variance)` where `Variance` includes the learned observation noise variance and coefficient posterior uncertainty only; the intercept is not treated as a probabilistic parameter. **Compilation flags:** `static` **Template:** `predict_distribution(Regressor,Instance,Distribution)` **Mode and number of proofs:** `predict_distribution(+compound,+list,-compound)` - `one` ------------------------------------------------------------------------ ###### `weight_variances/2` Returns the posterior marginal variances of the encoded feature coefficients in encoder order. Encoded features dropped from fitting because they had zero variance are reported with posterior variance zero. **Compilation flags:** `static` **Template:** `weight_variances(Regressor,Variances)` **Mode and number of proofs:** `weight_variances(+compound,-list(float))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, ridge_regression, lasso_regression, elastic_net_regression, gaussian_process_regression, knn_regression, regression_tree, random_forest_regression, gradient_boosting_regression ### borda_ranker") **object** #### `borda_ranker` Borda grouped-ranking ranker. Learns one deterministic score per item from a dataset object implementing the `ranking_dataset_protocol` protocol by summing per-group Borda points and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(borda_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common **Uses:** avltree **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ranking_dataset_protocol, ranker_protocol, copeland_ranker ### bradley_terry_ranker") **object** #### `bradley_terry_ranker` Bradley-Terry pairwise preference ranker. Learns one positive strength parameter per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol when the directed win graph admits a finite Bradley-Terry maximum-likelihood estimate, and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(bradley_terry_ranker(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` pairwise_strength_ranker_common `public` score_ranker_common **Uses:** avltree format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranking_dataset_protocol, ranker_protocol, regularized_bradley_terry_ranker ### c45_classifier") **object** #### `c45_classifier` C4.5 decision tree learning algorithm. Builds a decision tree from a dataset object implementing the `dataset_protocol` protocol and provides predicates for exporting the learned tree as a list of predicate clauses or to a file. Supports both discrete and continuous attributes, handles missing values, and supports tree pruning. **Availability:** `logtalk_load(c45_classifier(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` classifier_common **Uses:** format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - `prune/5` - `prune/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `prune/5` Prunes a decision tree using pessimistic error pruning (PEP). This post-pruning method estimates error rates using the upper confidence bound of the binomial distribution with the given confidence factor and replaces subtrees with leaf nodes when doing so would not increase the estimated error. Pruning helps reduce overfitting and can improve generalization to unseen data. **Compilation flags:** `static` **Template:** `prune(Dataset,Tree,ConfidenceFactor,MinInstances,PrunedTree)` **Mode and number of proofs:** `prune(+object_identifier,+tree,+float,+positive_integer,-tree)` - `one` **Remarks:** > - Confidence factor: The confidence factor controls the aggressiveness of pruning. It must be in the range `(0.0,`` ``1.0)`. Lower values result in more aggressive pruning (smaller, simpler trees), while higher values result in less pruning (larger, more complex trees). The default value is `0.25`. > > - Minimum instances per leaf: The minimum number of instances required at a leaf node. When a node has fewer instances than this value, the node may be pruned. It must be a positive integer. The default value is `2`. > > - Statistical basis: The pruning uses the upper confidence bound of the binomial distribution to estimate the true error rate. ------------------------------------------------------------------------ ###### `prune/3` Prunes a decision tree using pessimistic error pruning (PEP) with default parameter values. Calls `prune/5` with `ConfidenceFactor`` ``=`` ``0.25` and `MinInstances`` ``=`` ``2`. **Compilation flags:** `static` **Template:** `prune(Dataset,Tree,PrunedTree)` **Mode and number of proofs:** `prune(+object_identifier,+tree,-tree)` - `one` **Remarks:** > - Default parameters: Uses the standard C4.5 default values: confidence factor of `0.25` (the confidence level for computing the upper bound of the error estimate) and minimum instances per leaf of `2`. ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, isolation_forest_anomaly_detector, knn_classifier, naive_bayes_classifier, nearest_centroid_classifier, random_forest_classifier, adaptive_boosting_classifier ### cartesian_products") **object** #### `cartesian_products` Implementation of Cartesian-product operations over lists. **Availability:** `logtalk_load(cartesian_products(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` cartesian_products_protocol **Uses:** fast_random(Algorithm) list **Remarks:** (none) **Inherited public predicates:**  cartesian_product/2  cartesian_product/3  cartesian_tuple/2  cartesian_tuple/3  cartesian_tuple_index/3  cartesian_tuple_index/4  count_cartesian_product/2  count_distinct_cartesian_product/2  distinct_cartesian_product/2  distinct_cartesian_product/3  distinct_cartesian_tuple/2  distinct_cartesian_tuple/3  distinct_cartesian_tuple_index/3  next_cartesian_tuple/3  nth_cartesian_tuple/3  nth_cartesian_tuple/4  nth_distinct_cartesian_tuple/3  previous_cartesian_tuple/3  random_cartesian_tuple/2  random_distinct_cartesian_tuple/2  sample_cartesian_tuples/3  sample_distinct_cartesian_tuples/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `cartesian_products_protocol` Protocol for Cartesian-product operations over lists. **Availability:** `logtalk_load(cartesian_products(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-12 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `cartesian_product/2` - `cartesian_tuple/2` - `cartesian_product/3` - `cartesian_tuple/3` - `distinct_cartesian_product/2` - `distinct_cartesian_tuple/2` - `distinct_cartesian_product/3` - `distinct_cartesian_tuple/3` - `count_cartesian_product/2` - `count_distinct_cartesian_product/2` - `nth_cartesian_tuple/3` - `nth_cartesian_tuple/4` - `cartesian_tuple_index/3` - `cartesian_tuple_index/4` - `nth_distinct_cartesian_tuple/3` - `distinct_cartesian_tuple_index/3` - `random_cartesian_tuple/2` - `sample_cartesian_tuples/3` - `random_distinct_cartesian_tuple/2` - `sample_distinct_cartesian_tuples/3` - `next_cartesian_tuple/3` - `previous_cartesian_tuple/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `cartesian_product/2` Generates the Cartesian product of a list of lists using default order. **Compilation flags:** `static` **Template:** `cartesian_product(Lists,Product)` **Mode and number of proofs:** `cartesian_product(+list(list),-list)` - `one` ------------------------------------------------------------------------ ###### `cartesian_tuple/2` True iff the second argument is a tuple obtained by selecting one element from each list in the first argument using default order. **Compilation flags:** `static` **Template:** `cartesian_tuple(Lists,Tuple)` **Mode and number of proofs:** `cartesian_tuple(+list(list),-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `cartesian_product/3` Generates the Cartesian product with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `cartesian_product(Lists,Order,Product)` **Mode and number of proofs:** `cartesian_product(+list(list),+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `cartesian_tuple/3` True iff the third argument is a Cartesian-product tuple with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `cartesian_tuple(Lists,Order,Tuple)` **Mode and number of proofs:** `cartesian_tuple(+list(list),+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_cartesian_product/2` Generates the Cartesian product after deduplicating repeated values in each factor list using default order. **Compilation flags:** `static` **Template:** `distinct_cartesian_product(Lists,Product)` **Mode and number of proofs:** `distinct_cartesian_product(+list(list),-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_cartesian_tuple/2` True iff the second argument is a tuple in the distinct Cartesian product of the factor lists using default order. **Compilation flags:** `static` **Template:** `distinct_cartesian_tuple(Lists,Tuple)` **Mode and number of proofs:** `distinct_cartesian_tuple(+list(list),-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_cartesian_product/3` Generates the distinct Cartesian product with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_cartesian_product(Lists,Order,Product)` **Mode and number of proofs:** `distinct_cartesian_product(+list(list),+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_cartesian_tuple/3` True iff the third argument is a tuple in the distinct Cartesian product with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_cartesian_tuple(Lists,Order,Tuple)` **Mode and number of proofs:** `distinct_cartesian_tuple(+list(list),+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `count_cartesian_product/2` Counts the number of tuples in the Cartesian product of a list of lists. **Compilation flags:** `static` **Template:** `count_cartesian_product(Lists,Count)` **Mode and number of proofs:** `count_cartesian_product(+list(list),-integer)` - `one` ------------------------------------------------------------------------ ###### `count_distinct_cartesian_product/2` Counts the number of tuples in the distinct Cartesian product after deduplicating repeated values in each factor list. **Compilation flags:** `static` **Template:** `count_distinct_cartesian_product(Lists,Count)` **Mode and number of proofs:** `count_distinct_cartesian_product(+list(list),-integer)` - `one` ------------------------------------------------------------------------ ###### `nth_cartesian_tuple/3` Returns the Cartesian-product tuple at a given zero-based index using default order. **Compilation flags:** `static` **Template:** `nth_cartesian_tuple(Lists,Index,Tuple)` **Mode and number of proofs:** `nth_cartesian_tuple(+list(list),+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_cartesian_tuple/4` Returns the Cartesian-product tuple at a given zero-based index in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `nth_cartesian_tuple(Lists,Order,Index,Tuple)` **Mode and number of proofs:** `nth_cartesian_tuple(+list(list),+atom,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cartesian_tuple_index/3` Returns the zero-based index of a Cartesian-product tuple using default order. **Compilation flags:** `static` **Template:** `cartesian_tuple_index(Lists,Tuple,Index)` **Mode and number of proofs:** `cartesian_tuple_index(+list(list),+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cartesian_tuple_index/4` Returns the zero-based index of a Cartesian-product tuple in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `cartesian_tuple_index(Lists,Order,Tuple,Index)` **Mode and number of proofs:** `cartesian_tuple_index(+list(list),+atom,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_distinct_cartesian_tuple/3` Returns the distinct Cartesian-product tuple at a given zero-based index in default generation order. **Compilation flags:** `static` **Template:** `nth_distinct_cartesian_tuple(Lists,Index,Tuple)` **Mode and number of proofs:** `nth_distinct_cartesian_tuple(+list(list),+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_cartesian_tuple_index/3` Returns the zero-based index of a distinct Cartesian-product tuple in default generation order. **Compilation flags:** `static` **Template:** `distinct_cartesian_tuple_index(Lists,Tuple,Index)` **Mode and number of proofs:** `distinct_cartesian_tuple_index(+list(list),+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_cartesian_tuple/2` Returns a random Cartesian-product tuple. **Compilation flags:** `static` **Template:** `random_cartesian_tuple(Lists,Tuple)` **Mode and number of proofs:** `random_cartesian_tuple(+list(list),-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_cartesian_tuples/3` Returns SampleCount random Cartesian-product tuples, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_cartesian_tuples(Lists,SampleCount,Samples)` **Mode and number of proofs:** `sample_cartesian_tuples(+list(list),+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_distinct_cartesian_tuple/2` Returns a random tuple from the distinct Cartesian product after deduplicating repeated values in each factor list. **Compilation flags:** `static` **Template:** `random_distinct_cartesian_tuple(Lists,Tuple)` **Mode and number of proofs:** `random_distinct_cartesian_tuple(+list(list),-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_distinct_cartesian_tuples/3` Returns SampleCount random tuples from the distinct Cartesian product, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_distinct_cartesian_tuples(Lists,SampleCount,Samples)` **Mode and number of proofs:** `sample_distinct_cartesian_tuples(+list(list),+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next_cartesian_tuple/3` Returns the next distinct Cartesian-product tuple in lexicographic order induced by the factor lists. **Compilation flags:** `static` **Template:** `next_cartesian_tuple(Lists,Tuple,Next)` **Mode and number of proofs:** `next_cartesian_tuple(+list(list),+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_cartesian_tuple/3` Returns the previous distinct Cartesian-product tuple in lexicographic order induced by the factor lists. **Compilation flags:** `static` **Template:** `previous_cartesian_tuple(Lists,Tuple,Previous)` **Mode and number of proofs:** `previous_cartesian_tuple(+list(list),+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### cbor") **object** #### `cbor` Concise Binary Object Representation (CBOR) format exporter and importer. Uses atoms to represent decoded CBOR strings. **Availability:** `logtalk_load(cbor(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2021-03-04 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` cbor(atom) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `cbor(StringRepresentation)` - `StringRepresentation` - Text representation to be used when decoding CBOR strings. Possible values are `atom` (default), `chars`, and `codes`. Concise Binary Object Representation (CBOR) format exporter and importer. **Availability:** `logtalk_load(cbor(loader))` **Author:** Paulo Moura **Version:** 0:12:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ieee_754(Precision,ByteOrder,NaNRepresentation) list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a list of bytes in the CBOR format returning the corresponding term representation. Throws an error when parsing is not possible (usually due to an invalid byte sequence). **Compilation flags:** `static` **Template:** `parse(Bytes,Term)` **Mode and number of proofs:** `parse(@list(byte),-ground)` - `one_or_error` **Exceptions:** `Bytes` is not ground: `instantiation_error` `Bytes` is not a valid CBOR byte sequence: `domain_error(cbor_byte_sequence,Bytes)` ------------------------------------------------------------------------ ###### `generate/2` Generates a list of bytes in the CBOR format representing the given term. Throws an error when generating is not possible (usually due to a term that have no CBOR corresponding representation). **Compilation flags:** `static` **Template:** `generate(Term,Bytes)` **Mode and number of proofs:** `generate(@ground,-list(byte))` - `one_or_error` **Exceptions:** `Term` is a variable: `instantiation_error` `Term` is neither a variable nor has a corresponding CBOR representation: `domain_error(cbor_term,Term)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ccsds_frames") **object** #### `ccsds_aos_frames(FrameLength,InsertZoneLength,HasOCF,HasFECF)` - `FrameLength` - Fixed AOS transfer frame length in octets. - `InsertZoneLength` - Length in octets of the optional insert zone when present. - `HasOCF` - Boolean indicating if frames include the operational control field. - `HasFECF` - Boolean indicating if frames include the frame error control field. CCSDS advanced orbiting systems transfer frame parser and generator. **Availability:** `logtalk_load(ccsds_frames(loader))` **Author:** Paulo Moura **Version:** 1:0:2 **Date:** 2026-06-24 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ccsds_frame_protocol **Uses:** list reader type **Remarks:** (none) **Inherited public predicates:**  data_field/2  fecf/2  frame_type/2  generate/2  generate/3  ocf/2  parse/2  spacecraft_id/2  valid/1  version/2  virtual_channel_id/2 - Public predicates - `virtual_channel_frame_count/2` - `signaling_field/2` - `insert_zone/2` - `update_fecf/2` - `verify_fecf/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `virtual_channel_frame_count/2` Extracts the virtual channel frame count. **Compilation flags:** `static` **Template:** `virtual_channel_frame_count(Frame,Count)` **Mode and number of proofs:** `virtual_channel_frame_count(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `signaling_field/2` Extracts the signaling field term. **Compilation flags:** `static` **Template:** `signaling_field(Frame,SignalingField)` **Mode and number of proofs:** `signaling_field(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `insert_zone/2` Extracts the optional insert zone. Returns `none` when absent. **Compilation flags:** `static` **Template:** `insert_zone(Frame,InsertZone)` **Mode and number of proofs:** `insert_zone(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `update_fecf/2` Computes the correct AOS transfer frame FECF for the selected object configuration and returns the corresponding updated frame term. **Compilation flags:** `static` **Template:** `update_fecf(Frame,UpdatedFrame)` **Mode and number of proofs:** `update_fecf(+compound,-compound)` - `one_or_error` **Exceptions:** `Frame` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `verify_fecf/1` True if the AOS transfer frame term contains the correct FECF for the selected object configuration. **Compilation flags:** `static` **Template:** `verify_fecf(Frame)` **Mode and number of proofs:** `verify_fecf(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `ccsds_frame_protocol` CCSDS transfer frame parser and generator protocol. **Availability:** `logtalk_load(ccsds_frames(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `generate/3` - `valid/1` - `update_fecf/2` - `verify_fecf/1` - `frame_type/2` - `version/2` - `spacecraft_id/2` - `virtual_channel_id/2` - `data_field/2` - `ocf/2` - `fecf/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses CCSDS transfer frame(s) from a source. Supported source terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `parse(Source,Frames)` **Mode and number of proofs:** `parse(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is not a valid CCSDS frame source term: `domain_error(ccsds_frame_source,Source)` `Source` bytes are not a valid CCSDS frame byte sequence for the selected frame type: `domain_error(ccsds_frame_byte_sequence,Bytes)` ------------------------------------------------------------------------ ###### `generate/2` Generates CCSDS transfer frame bytes to a sink. Supported sink terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `generate(Sink,Frames)` **Mode and number of proofs:** `generate(+compound,+list(compound))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is not a valid CCSDS frame sink term: `domain_error(ccsds_frame_sink,Sink)` `Frames` is not a valid list of CCSDS transfer frame terms for the selected frame type: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `generate/3` Generates a list of bytes from a single CCSDS transfer frame term with an open tail. When the selected object includes an FECF, the generated bytes use a freshly computed FECF derived from the remaining frame fields. **Compilation flags:** `static` **Template:** `generate(Frame,Bytes,Tail)` **Mode and number of proofs:** `generate(+compound,-list(byte),--variable)` - `one_or_error` **Exceptions:** `Frame` is a variable: `instantiation_error` `Frame` is not a valid CCSDS transfer frame term for the selected frame type: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `valid/1` True if the argument is a valid transfer frame term for the selected object and, when applicable, carries the correct FECF for the remaining frame fields. **Compilation flags:** `static` **Template:** `valid(Frame)` **Mode and number of proofs:** `valid(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update_fecf/2` Computes the correct frame error control field for the selected object configuration and returns the corresponding updated frame term. **Compilation flags:** `static` **Template:** `update_fecf(Frame,UpdatedFrame)` **Mode and number of proofs:** `update_fecf(+compound,-compound)` - `one_or_error` **Exceptions:** `Frame` is a variable: `instantiation_error` `Frame` is not a valid CCSDS transfer frame term for the selected frame type: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `verify_fecf/1` True if the frame term contains the correct FECF for the selected object configuration. **Compilation flags:** `static` **Template:** `verify_fecf(Frame)` **Mode and number of proofs:** `verify_fecf(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `frame_type/2` Returns the transfer frame type for a frame term. **Compilation flags:** `static` **Template:** `frame_type(Frame,Type)` **Mode and number of proofs:** `frame_type(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `version/2` Extracts the transfer frame version number. **Compilation flags:** `static` **Template:** `version(Frame,Version)` **Mode and number of proofs:** `version(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `spacecraft_id/2` Extracts the spacecraft identifier. **Compilation flags:** `static` **Template:** `spacecraft_id(Frame,SpacecraftId)` **Mode and number of proofs:** `spacecraft_id(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `virtual_channel_id/2` Extracts the virtual channel identifier. **Compilation flags:** `static` **Template:** `virtual_channel_id(Frame,VirtualChannelId)` **Mode and number of proofs:** `virtual_channel_id(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `data_field/2` Extracts the transfer frame data field as a list of bytes. **Compilation flags:** `static` **Template:** `data_field(Frame,DataField)` **Mode and number of proofs:** `data_field(+compound,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `ocf/2` Extracts the operational control field. Returns `none` when absent. **Compilation flags:** `static` **Template:** `ocf(Frame,OCF)` **Mode and number of proofs:** `ocf(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `fecf/2` Extracts the frame error control field. Returns `none` when absent. **Compilation flags:** `static` **Template:** `fecf(Frame,FECF)` **Mode and number of proofs:** `fecf(+compound,-compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `ccsds_frames` Helpers for introspecting CCSDS transfer frame terms. **Availability:** `logtalk_load(ccsds_frames(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-09 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ccsds_packets(SecondaryHeaderLength) list type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid/1` - `frame_type/2` - `version/2` - `spacecraft_id/2` - `virtual_channel_id/2` - `data_field/2` - `ocf/2` - `fecf/2` - `update_fecf/2` - `verify_fecf/1` - `extract_packets/3` - `insert_packets/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid/1` True if the argument is a known CCSDS transfer frame term. **Compilation flags:** `static` **Template:** `valid(Frame)` **Mode and number of proofs:** `valid(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `frame_type/2` Returns the CCSDS transfer frame type for a known frame term. **Compilation flags:** `static` **Template:** `frame_type(Frame,Type)` **Mode and number of proofs:** `frame_type(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `version/2` Extracts the transfer frame version number from a known frame term. **Compilation flags:** `static` **Template:** `version(Frame,Version)` **Mode and number of proofs:** `version(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `spacecraft_id/2` Extracts the spacecraft identifier from a known frame term. **Compilation flags:** `static` **Template:** `spacecraft_id(Frame,SpacecraftId)` **Mode and number of proofs:** `spacecraft_id(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `virtual_channel_id/2` Extracts the virtual channel identifier from a known frame term. **Compilation flags:** `static` **Template:** `virtual_channel_id(Frame,VirtualChannelId)` **Mode and number of proofs:** `virtual_channel_id(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `data_field/2` Extracts the raw data field bytes from a known frame term. **Compilation flags:** `static` **Template:** `data_field(Frame,DataField)` **Mode and number of proofs:** `data_field(+compound,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `ocf/2` Extracts the operational control field. Returns `none` when absent. **Compilation flags:** `static` **Template:** `ocf(Frame,OCF)` **Mode and number of proofs:** `ocf(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `fecf/2` Extracts the frame error control field. Returns `none` when absent. **Compilation flags:** `static` **Template:** `fecf(Frame,FECF)` **Mode and number of proofs:** `fecf(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `update_fecf/2` Refreshes a present frame error control field from the remaining frame fields while leaving frames without an FECF unchanged. **Compilation flags:** `static` **Template:** `update_fecf(Frame,UpdatedFrame)` **Mode and number of proofs:** `update_fecf(+compound,-compound)` - `one_or_error` **Exceptions:** `Frame` is a variable: `instantiation_error` `Frame` is not a valid CCSDS transfer frame term: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `verify_fecf/1` True if a present frame error control field matches the remaining frame fields. Frames without an FECF succeed. **Compilation flags:** `static` **Template:** `verify_fecf(Frame)` **Mode and number of proofs:** `verify_fecf(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `extract_packets/3` Parses the raw frame data field as CCSDS space packet bytes using the given packet secondary header length. **Compilation flags:** `static` **Template:** `extract_packets(Frame,SecondaryHeaderLength,Packets)` **Mode and number of proofs:** `extract_packets(+compound,+integer,-list(compound))` - `one_or_error` **Exceptions:** `Frame` is a variable: `instantiation_error` `SecondaryHeaderLength` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid CCSDS transfer frame term: `domain_error(ccsds_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` The frame data field is not a valid CCSDS packet byte sequence: `domain_error(ccsds_byte_sequence,Bytes)` ------------------------------------------------------------------------ ###### `insert_packets/4` Generates CCSDS packet bytes and replaces the raw data field of a frame term, preserving the remaining header fields unchanged. **Compilation flags:** `static` **Template:** `insert_packets(Packets,SecondaryHeaderLength,Frame,UpdatedFrame)` **Mode and number of proofs:** `insert_packets(+list(compound),+integer,+compound,-compound)` - `one_or_error` **Exceptions:** `Packets` is a variable: `instantiation_error` `SecondaryHeaderLength` is a variable: `instantiation_error` `Frame` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid CCSDS transfer frame term: `domain_error(ccsds_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` An element `Packet` of `Packets` is a variable or `Packets` is a partial list: `instantiation_error` An element `Packet` of `Packets` is neither a variable nor a valid CCSDS packet term: `domain_error(ccsds_packet_term,Packet)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `ccsds_frames_types` Type definitions for CCSDS transfer frames. **Availability:** `logtalk_load(ccsds_frames(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-08 **Compilation flags:** `static` **Provides:** type::type/1 type::check/2 **Uses:** ccsds_aos_frames(FrameLength,InsertZoneLength,HasOCF,HasFECF) ccsds_tc_frames(FrameLength,SegmentHeaderLength,HasFECF) ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `ccsds_tc_frames(FrameLength,SegmentHeaderLength,HasFECF)` - `FrameLength` - Fixed telecommand transfer frame length in octets. - `SegmentHeaderLength` - Length in octets of the optional segment header when present. - `HasFECF` - Boolean indicating if frames include the frame error control field. CCSDS telecommand transfer frame parser and generator. **Availability:** `logtalk_load(ccsds_frames(loader))` **Author:** Paulo Moura **Version:** 1:0:2 **Date:** 2026-06-24 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ccsds_frame_protocol **Uses:** list reader type **Remarks:** (none) **Inherited public predicates:**  data_field/2  fecf/2  frame_type/2  generate/2  generate/3  ocf/2  parse/2  spacecraft_id/2  valid/1  version/2  virtual_channel_id/2 - Public predicates - `bypass_flag/2` - `control_command_flag/2` - `sequence_number/2` - `segment_header/2` - `update_fecf/2` - `verify_fecf/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `bypass_flag/2` Extracts the bypass flag value. **Compilation flags:** `static` **Template:** `bypass_flag(Frame,Flag)` **Mode and number of proofs:** `bypass_flag(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `control_command_flag/2` Extracts the control command flag value. **Compilation flags:** `static` **Template:** `control_command_flag(Frame,Flag)` **Mode and number of proofs:** `control_command_flag(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `sequence_number/2` Extracts the frame sequence number. **Compilation flags:** `static` **Template:** `sequence_number(Frame,SequenceNumber)` **Mode and number of proofs:** `sequence_number(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `segment_header/2` Extracts the optional segment header. Returns `none` when absent. **Compilation flags:** `static` **Template:** `segment_header(Frame,SegmentHeader)` **Mode and number of proofs:** `segment_header(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `update_fecf/2` Computes the correct telecommand transfer frame FECF for the selected object configuration and returns the corresponding updated frame term. **Compilation flags:** `static` **Template:** `update_fecf(Frame,UpdatedFrame)` **Mode and number of proofs:** `update_fecf(+compound,-compound)` - `one_or_error` **Exceptions:** `Frame` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `verify_fecf/1` True if the telecommand transfer frame term contains the correct FECF for the selected object configuration. **Compilation flags:** `static` **Template:** `verify_fecf(Frame)` **Mode and number of proofs:** `verify_fecf(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF)` - `FrameLength` - Fixed telemetry transfer frame length in octets. - `SecondaryHeaderLength` - Length in octets of the telemetry transfer frame secondary header when present. - `HasFECF` - Boolean indicating if frames include the frame error control field. CCSDS telemetry transfer frame parser and generator. **Availability:** `logtalk_load(ccsds_frames(loader))` **Author:** Paulo Moura **Version:** 1:0:2 **Date:** 2026-06-24 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ccsds_frame_protocol **Uses:** list reader type **Remarks:** (none) **Inherited public predicates:**  data_field/2  fecf/2  frame_type/2  generate/2  generate/3  ocf/2  parse/2  spacecraft_id/2  valid/1  version/2  virtual_channel_id/2 - Public predicates - `ocf_flag/2` - `master_channel_frame_count/2` - `virtual_channel_frame_count/2` - `secondary_header_flag/2` - `synchronization_flag/2` - `packet_order_flag/2` - `segment_length_identifier/2` - `first_header_pointer/2` - `secondary_header/2` - `update_fecf/2` - `verify_fecf/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `ocf_flag/2` Extracts the operational control field flag. Returns `absent` or `present`. **Compilation flags:** `static` **Template:** `ocf_flag(Frame,Flag)` **Mode and number of proofs:** `ocf_flag(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `master_channel_frame_count/2` Extracts the master channel frame count. **Compilation flags:** `static` **Template:** `master_channel_frame_count(Frame,Count)` **Mode and number of proofs:** `master_channel_frame_count(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `virtual_channel_frame_count/2` Extracts the virtual channel frame count. **Compilation flags:** `static` **Template:** `virtual_channel_frame_count(Frame,Count)` **Mode and number of proofs:** `virtual_channel_frame_count(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `secondary_header_flag/2` Extracts the telemetry transfer frame secondary header flag. Returns `absent` or `present`. **Compilation flags:** `static` **Template:** `secondary_header_flag(Frame,Flag)` **Mode and number of proofs:** `secondary_header_flag(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `synchronization_flag/2` Extracts the synchronization flag value. **Compilation flags:** `static` **Template:** `synchronization_flag(Frame,Flag)` **Mode and number of proofs:** `synchronization_flag(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `packet_order_flag/2` Extracts the packet order flag value. **Compilation flags:** `static` **Template:** `packet_order_flag(Frame,Flag)` **Mode and number of proofs:** `packet_order_flag(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `segment_length_identifier/2` Extracts the segment length identifier value. **Compilation flags:** `static` **Template:** `segment_length_identifier(Frame,Identifier)` **Mode and number of proofs:** `segment_length_identifier(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `first_header_pointer/2` Extracts the first header pointer value. **Compilation flags:** `static` **Template:** `first_header_pointer(Frame,Pointer)` **Mode and number of proofs:** `first_header_pointer(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `secondary_header/2` Extracts the telemetry transfer frame secondary header. Returns `none` when absent. **Compilation flags:** `static` **Template:** `secondary_header(Frame,SecondaryHeader)` **Mode and number of proofs:** `secondary_header(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `update_fecf/2` Computes the correct telemetry transfer frame FECF for the selected object configuration and returns the corresponding updated frame term. **Compilation flags:** `static` **Template:** `update_fecf(Frame,UpdatedFrame)` **Mode and number of proofs:** `update_fecf(+compound,-compound)` - `one_or_error` **Exceptions:** `Frame` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid telemetry transfer frame term: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `verify_fecf/1` True if the telemetry transfer frame term contains the correct FECF for the selected object configuration. **Compilation flags:** `static` **Template:** `verify_fecf(Frame)` **Mode and number of proofs:** `verify_fecf(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ccsds_link_profiles") **object** #### `ccsds_link_profiles` Ergonomic wrappers around the CCSDS TM, TC, and AOS frame objects using explicit profile terms. **Availability:** `logtalk_load(ccsds_link_profiles(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-20 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ccsds_packet_services **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid_profile/1` - `parse_frame/3` - `parse_frames/3` - `generate_frame/3` - `generate_frames/3` - `valid_reassembly_state/1` - `initial_reassembly_state/1` - `pending_fragments/2` - `valid_discontinuity_policy/1` - `extract_packets/4` - `insert_packets/5` - `reassemble_packets/6` - `reassemble_packets/7` - `reassemble_packets/8` - `reassemble_frames/6` - `reassemble_frames/7` - `reassemble_frames/8` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_profile/1` True if the argument is a supported CCSDS link profile term. **Compilation flags:** `static` **Template:** `valid_profile(Profile)` **Mode and number of proofs:** `valid_profile(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse_frame/3` Parses exactly one CCSDS transfer frame from a source using a link profile term. Supported source terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `parse_frame(Source,Profile,Frame)` **Mode and number of proofs:** `parse_frame(+compound,+compound,-compound)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Profile` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Source` does not contain exactly one frame for the selected profile: `domain_error(ccsds_single_frame_source,Source)` ------------------------------------------------------------------------ ###### `parse_frames/3` Parses zero or more CCSDS transfer frames from a source using a link profile term. Supported source terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `parse_frames(Source,Profile,Frames)` **Mode and number of proofs:** `parse_frames(+compound,+compound,-list(compound))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Profile` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` ------------------------------------------------------------------------ ###### `generate_frame/3` Generates exactly one CCSDS transfer frame to a sink using a link profile term. Supported sink terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `generate_frame(Sink,Profile,Frame)` **Mode and number of proofs:** `generate_frame(+compound,+compound,+compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Profile` is a variable: `instantiation_error` `Frame` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Frame` is neither a variable nor a valid frame term for the selected profile: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `generate_frames/3` Generates zero or more CCSDS transfer frames to a sink using a link profile term. Supported sink terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `generate_frames(Sink,Profile,Frames)` **Mode and number of proofs:** `generate_frames(+compound,+compound,+list(compound))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Profile` is a variable: `instantiation_error` `Frames` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Frames` is neither a variable nor a list of valid frame terms for the selected profile: `domain_error(ccsds_frame_terms,Frames)` ------------------------------------------------------------------------ ###### `valid_reassembly_state/1` True if the argument is a valid TM/AOS channel packet reassembly state term for the profile-level packet reassembly predicates. **Compilation flags:** `static` **Template:** `valid_reassembly_state(State)` **Mode and number of proofs:** `valid_reassembly_state(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `initial_reassembly_state/1` Returns the initial TM/AOS channel packet reassembly state for the profile-level packet reassembly predicates. **Compilation flags:** `static` **Template:** `initial_reassembly_state(State)` **Mode and number of proofs:** `initial_reassembly_state(-compound)` - `one` ------------------------------------------------------------------------ ###### `pending_fragments/2` Returns the non-empty pending packet fragments currently buffered per TM or AOS virtual channel. **Compilation flags:** `static` **Template:** `pending_fragments(State,PendingFragments)` **Mode and number of proofs:** `pending_fragments(+compound,-list(compound))` - `one_or_error` **Exceptions:** `State` is a variable: `instantiation_error` `State` is not a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` ------------------------------------------------------------------------ ###### `valid_discontinuity_policy/1` True if the argument is a valid packet reassembly discontinuity recovery policy atom. Valid values are `throw`, `drop`, and `resynchronize`. **Compilation flags:** `static` **Template:** `valid_discontinuity_policy(Policy)` **Mode and number of proofs:** `valid_discontinuity_policy(@atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `extract_packets/4` Extracts the TM first-header-pointer packet zone or the AOS M_PDU packet zone from a TM or AOS frame using the selected link profile and packet secondary header length. **Compilation flags:** `static` **Template:** `extract_packets(Profile,SecondaryHeaderLength,Frame,PacketZone)` **Mode and number of proofs:** `extract_packets(+compound,+integer,+compound,-compound)` - `one_or_error` **Exceptions:** `Profile` is a variable: `instantiation_error` `SecondaryHeaderLength` is a variable: `instantiation_error` `Frame` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Profile` is a telecommand profile and therefore does not support packet extraction: `domain_error(ccsds_packet_link_profile,Profile)` `Frame` is neither a variable nor a valid frame term for the selected profile: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `insert_packets/5` Regenerates the TM first-header-pointer packet zone or the AOS M_PDU packet zone for a TM or AOS frame using the selected link profile and packet secondary header length. **Compilation flags:** `static` **Template:** `insert_packets(Profile,SecondaryHeaderLength,PacketZone,Frame,UpdatedFrame)` **Mode and number of proofs:** `insert_packets(+compound,+integer,+compound,+compound,-compound)` - `one_or_error` **Exceptions:** `Profile` is a variable: `instantiation_error` `SecondaryHeaderLength` is a variable: `instantiation_error` `PacketZone` is a variable: `instantiation_error` `Frame` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Profile` is a telecommand profile and therefore does not support packet insertion: `domain_error(ccsds_packet_link_profile,Profile)` `Frame` is neither a variable nor a valid frame term for the selected profile: `domain_error(ccsds_frame_term,Frame)` ------------------------------------------------------------------------ ###### `reassemble_packets/6` Reassembles complete packets from a single TM or AOS transfer frame using the default `throw` discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_packets(Profile,SecondaryHeaderLength,Frame,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_packets(+compound,+integer,+compound,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Profile`, `SecondaryHeaderLength`, `Frame`, or `State` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Profile` is a telecommand profile and therefore does not support packet reassembly: `domain_error(ccsds_packet_link_profile,Profile)` `Frame` is neither a variable nor a valid TM or AOS frame term for the selected profile: `domain_error(ccsds_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The delegated packet reassembly detects a discontinuous frame sequence, inconsistent counter modulus, or invalid continuation state: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A delegated packet continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_packets/7` Reassembles complete packets from a single TM or AOS transfer frame using the selected discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_packets(Profile,SecondaryHeaderLength,Frame,Policy,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_packets(+compound,+integer,+compound,+atom,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Profile`, `SecondaryHeaderLength`, `Frame`, `Policy`, or `State` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Profile` is a telecommand profile and therefore does not support packet reassembly: `domain_error(ccsds_packet_link_profile,Profile)` `Frame` is neither a variable nor a valid TM or AOS frame term for the selected profile: `domain_error(ccsds_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The delegated packet reassembly detects a discontinuous frame sequence, inconsistent counter modulus, or invalid continuation state under the `throw` policy: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A delegated packet continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_packets/8` Reassembles complete packets from a single TM or AOS transfer frame using the selected discontinuity recovery policy and returns any recovery events. **Compilation flags:** `static` **Template:** `reassemble_packets(Profile,SecondaryHeaderLength,Frame,Policy,State,Packets,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_packets(+compound,+integer,+compound,+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Profile`, `SecondaryHeaderLength`, `Frame`, `Policy`, or `State` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Profile` is a telecommand profile and therefore does not support packet reassembly: `domain_error(ccsds_packet_link_profile,Profile)` `Frame` is neither a variable nor a valid TM or AOS frame term for the selected profile: `domain_error(ccsds_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The delegated packet reassembly detects a discontinuous frame sequence, inconsistent counter modulus, or invalid continuation state under the `throw` policy: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A delegated packet continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_frames/6` Reassembles complete packets across a sequence of TM or AOS transfer frames using the default `throw` discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_frames(Profile,SecondaryHeaderLength,Frames,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_frames(+compound,+integer,+list(compound),+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Profile`, `SecondaryHeaderLength`, `Frames`, or `State` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Profile` is a telecommand profile and therefore does not support packet reassembly: `domain_error(ccsds_packet_link_profile,Profile)` `Frames` is neither a variable nor a list of valid TM or AOS frame terms for the selected profile: `domain_error(ccsds_frame_terms,Frames)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The delegated packet reassembly detects a discontinuous frame sequence, inconsistent counter modulus, or invalid continuation state: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A delegated packet continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_frames/7` Reassembles complete packets across a sequence of TM or AOS transfer frames using the selected discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_frames(Profile,SecondaryHeaderLength,Frames,Policy,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_frames(+compound,+integer,+list(compound),+atom,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Profile`, `SecondaryHeaderLength`, `Frames`, `Policy`, or `State` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Profile` is a telecommand profile and therefore does not support packet reassembly: `domain_error(ccsds_packet_link_profile,Profile)` `Frames` is neither a variable nor a list of TM or AOS frame terms for the selected profile: `domain_error(ccsds_frame_terms,Frames)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The delegated packet reassembly detects a discontinuous frame sequence, inconsistent counter modulus, or invalid continuation state under the `throw` policy: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A delegated packet continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_frames/8` Reassembles complete packets across a sequence of TM or AOS transfer frames using the selected discontinuity recovery policy and returns any recovery events. **Compilation flags:** `static` **Template:** `reassemble_frames(Profile,SecondaryHeaderLength,Frames,Policy,State,Packets,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_frames(+compound,+integer,+list(compound),+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Profile`, `SecondaryHeaderLength`, `Frames`, `Policy`, or `State` is a variable: `instantiation_error` `Profile` is neither a variable nor a supported link profile term: `domain_error(ccsds_link_profile,Profile)` `Profile` is a telecommand profile and therefore does not support packet reassembly: `domain_error(ccsds_packet_link_profile,Profile)` `Frames` is neither a variable nor a list of TM or AOS frame terms for the selected profile: `domain_error(ccsds_frame_terms,Frames)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The delegated packet reassembly detects a discontinuous frame sequence, inconsistent counter modulus, or invalid continuation state under the `throw` policy: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A delegated packet continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ccsds_packet_services") **object** #### `ccsds_packet_services` Helpers for CCSDS packet service packet-zone splitting and cross-frame TM/AOS packet reassembly. **Availability:** `logtalk_load(ccsds_packet_services(loader))` **Author:** Paulo Moura **Version:** 0:1:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ccsds_packets(SecondaryHeaderLength) list type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid_reassembly_state/1` - `initial_reassembly_state/1` - `pending_data/2` - `valid_channel_reassembly_state/1` - `initial_channel_reassembly_state/1` - `pending_fragments/2` - `valid_discontinuity_policy/1` - `valid/1` - `prefix_data/2` - `packets/2` - `suffix_data/2` - `split_packet_zone/4` - `join_packet_zone/4` - `extract_tm_packets/3` - `insert_tm_packets/4` - `split_aos_packet_zone/3` - `join_aos_packet_zone/3` - `reassemble_packet_zone/5` - `extract_aos_packets/3` - `insert_aos_packets/4` - `reassemble_tm_packets/5` - `reassemble_tm_packets/6` - `reassemble_tm_packets/7` - `reassemble_tm_frames/5` - `reassemble_tm_frames/6` - `reassemble_tm_frames/7` - `reassemble_aos_packets/5` - `reassemble_aos_packets/6` - `reassemble_aos_packets/7` - `reassemble_aos_frames/5` - `reassemble_aos_frames/6` - `reassemble_aos_frames/7` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_reassembly_state/1` True if the argument is a valid packet reassembly state term. **Compilation flags:** `static` **Template:** `valid_reassembly_state(State)` **Mode and number of proofs:** `valid_reassembly_state(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `initial_reassembly_state/1` Returns the initial cross-frame packet reassembly state. **Compilation flags:** `static` **Template:** `initial_reassembly_state(State)` **Mode and number of proofs:** `initial_reassembly_state(-compound)` - `one` ------------------------------------------------------------------------ ###### `pending_data/2` Extracts the currently buffered trailing packet fragment bytes from a packet reassembly state. **Compilation flags:** `static` **Template:** `pending_data(State,Bytes)` **Mode and number of proofs:** `pending_data(+compound,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `valid_channel_reassembly_state/1` True if the argument is a valid frame-channel packet reassembly state term keyed by frame type, spacecraft identifier, and virtual channel identifier. **Compilation flags:** `static` **Template:** `valid_channel_reassembly_state(State)` **Mode and number of proofs:** `valid_channel_reassembly_state(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `initial_channel_reassembly_state/1` Returns the initial frame-channel packet reassembly state. **Compilation flags:** `static` **Template:** `initial_channel_reassembly_state(State)` **Mode and number of proofs:** `initial_channel_reassembly_state(-compound)` - `one` ------------------------------------------------------------------------ ###### `pending_fragments/2` Extracts the non-empty pending packet fragments buffered per frame type, spacecraft identifier, and virtual channel identifier. **Compilation flags:** `static` **Template:** `pending_fragments(State,PendingFragments)` **Mode and number of proofs:** `pending_fragments(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `valid_discontinuity_policy/1` True if the argument is a valid discontinuity recovery policy atom. Valid values are `throw`, `drop`, and `resynchronize`. **Compilation flags:** `static` **Template:** `valid_discontinuity_policy(Policy)` **Mode and number of proofs:** `valid_discontinuity_policy(@atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid/1` True if the argument is a valid packet-zone term. **Compilation flags:** `static` **Template:** `valid(PacketZone)` **Mode and number of proofs:** `valid(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `prefix_data/2` Extracts the bytes that precede the first complete packet in a packet zone. **Compilation flags:** `static` **Template:** `prefix_data(PacketZone,PrefixData)` **Mode and number of proofs:** `prefix_data(+compound,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `packets/2` Extracts the list of complete packets in a packet zone. **Compilation flags:** `static` **Template:** `packets(PacketZone,Packets)` **Mode and number of proofs:** `packets(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `suffix_data/2` Extracts the bytes that trail the last complete packet in a packet zone. **Compilation flags:** `static` **Template:** `suffix_data(PacketZone,SuffixData)` **Mode and number of proofs:** `suffix_data(+compound,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `split_packet_zone/4` Splits a packet-zone byte sequence using the first header pointer and parses any complete packets starting at that offset. A pointer value of 2047 denotes that no packet starts in the zone. **Compilation flags:** `static` **Template:** `split_packet_zone(Bytes,FirstHeaderPointer,SecondaryHeaderLength,PacketZone)` **Mode and number of proofs:** `split_packet_zone(+list(byte),+integer,+integer,-compound)` - `one_or_error` **Exceptions:** `Bytes`, `FirstHeaderPointer`, or `SecondaryHeaderLength` is a variable: `instantiation_error` `Bytes` is neither a variable nor a valid packet-zone byte sequence: `domain_error(ccsds_packet_zone_bytes,Bytes)` `FirstHeaderPointer` is neither a variable nor a valid first header pointer for `Bytes`: `domain_error(ccsds_first_header_pointer,FirstHeaderPointer)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` ------------------------------------------------------------------------ ###### `join_packet_zone/4` Encodes a packet-zone term back into bytes and returns the corresponding first header pointer. When the packet list is empty, the pointer is set to 2047. **Compilation flags:** `static` **Template:** `join_packet_zone(PacketZone,SecondaryHeaderLength,Bytes,FirstHeaderPointer)` **Mode and number of proofs:** `join_packet_zone(+compound,+integer,-list(byte),-integer)` - `one_or_error` **Exceptions:** `PacketZone` or `SecondaryHeaderLength` is a variable: `instantiation_error` `PacketZone` is neither a variable nor a valid packet-zone term: `domain_error(ccsds_packet_zone,PacketZone)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` ------------------------------------------------------------------------ ###### `extract_tm_packets/3` Extracts a TM transfer frame packet zone as a packet-zone term using the frame first header pointer and the given packet secondary header length. **Compilation flags:** `static` **Template:** `extract_tm_packets(Frame,SecondaryHeaderLength,PacketZone)` **Mode and number of proofs:** `extract_tm_packets(+compound,+integer,-compound)` - `one_or_error` **Exceptions:** `Frame` or `SecondaryHeaderLength` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` The frame packet-zone bytes or first header pointer are invalid: `domain_error(ccsds_packet_zone_bytes,Bytes)` ------------------------------------------------------------------------ ###### `insert_tm_packets/4` Updates a TM transfer frame data field and first header pointer from a packet-zone term while preserving the remaining frame fields unchanged. **Compilation flags:** `static` **Template:** `insert_tm_packets(PacketZone,SecondaryHeaderLength,Frame,UpdatedFrame)` **Mode and number of proofs:** `insert_tm_packets(+compound,+integer,+compound,-compound)` - `one_or_error` **Exceptions:** `PacketZone`, `SecondaryHeaderLength`, or `Frame` is a variable: `instantiation_error` `PacketZone` is neither a variable nor a valid packet-zone term: `domain_error(ccsds_packet_zone,PacketZone)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Frame` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` ------------------------------------------------------------------------ ###### `split_aos_packet_zone/3` Splits an AOS M_PDU packet-service data field into a packet-zone term. The first two octets are interpreted as the M_PDU first header pointer field, where 2046 denotes idle data only and 2047 denotes that no packet starts in the packet zone. **Compilation flags:** `static` **Template:** `split_aos_packet_zone(Bytes,SecondaryHeaderLength,PacketZone)` **Mode and number of proofs:** `split_aos_packet_zone(+list(byte),+integer,-compound)` - `one_or_error` **Exceptions:** `Bytes` or `SecondaryHeaderLength` is a variable: `instantiation_error` `Bytes` is neither a variable nor a valid AOS packet-zone byte sequence: `domain_error(ccsds_aos_packet_zone_bytes,Bytes)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` ------------------------------------------------------------------------ ###### `join_aos_packet_zone/3` Encodes a packet-zone term as an AOS M_PDU packet-service data field, including the two-octet first header pointer field. **Compilation flags:** `static` **Template:** `join_aos_packet_zone(PacketZone,SecondaryHeaderLength,Bytes)` **Mode and number of proofs:** `join_aos_packet_zone(+compound,+integer,-list(byte))` - `one_or_error` **Exceptions:** `PacketZone` or `SecondaryHeaderLength` is a variable: `instantiation_error` `PacketZone` is neither a variable nor a valid packet-zone term: `domain_error(ccsds_packet_zone,PacketZone)` `PacketZone` has neither packets nor a pure prefix or suffix and therefore cannot be encoded as an empty AOS packet zone: `domain_error(ccsds_aos_packet_zone,PacketZone)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` ------------------------------------------------------------------------ ###### `reassemble_packet_zone/5` Reassembles complete packets from a packet-zone term and a prior packet reassembly state, returning any complete packets plus the updated trailing fragment state. **Compilation flags:** `static` **Template:** `reassemble_packet_zone(PacketZone,SecondaryHeaderLength,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_packet_zone(+compound,+integer,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `PacketZone`, `SecondaryHeaderLength`, or `State` is a variable: `instantiation_error` `PacketZone` is neither a variable nor a valid packet-zone term: `domain_error(ccsds_packet_zone,PacketZone)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packet reassembly state: `domain_error(ccsds_packet_reassembly_state,State)` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `extract_aos_packets/3` Extracts an AOS transfer frame packet zone as a packet-zone term using the two-octet M_PDU header at the beginning of the frame data field. **Compilation flags:** `static` **Template:** `extract_aos_packets(Frame,SecondaryHeaderLength,PacketZone)` **Mode and number of proofs:** `extract_aos_packets(+compound,+integer,-compound)` - `one_or_error` **Exceptions:** `Frame` or `SecondaryHeaderLength` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` The frame data field is not a valid AOS packet-zone byte sequence: `domain_error(ccsds_aos_packet_zone_bytes,Bytes)` ------------------------------------------------------------------------ ###### `insert_aos_packets/4` Updates an AOS transfer frame data field from a packet-zone term by regenerating the M_PDU first header pointer and packet-zone bytes while preserving the remaining frame fields unchanged. **Compilation flags:** `static` **Template:** `insert_aos_packets(PacketZone,SecondaryHeaderLength,Frame,UpdatedFrame)` **Mode and number of proofs:** `insert_aos_packets(+compound,+integer,+compound,-compound)` - `one_or_error` **Exceptions:** `PacketZone`, `SecondaryHeaderLength`, or `Frame` is a variable: `instantiation_error` `PacketZone` is neither a variable nor a valid packet-zone term: `domain_error(ccsds_packet_zone,PacketZone)` `PacketZone` cannot be encoded as an AOS empty packet zone: `domain_error(ccsds_aos_packet_zone,PacketZone)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Frame` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` ------------------------------------------------------------------------ ###### `reassemble_tm_packets/5` Extracts the packet zone from a TM transfer frame, using the default `throw` discontinuity recovery policy, and returns the complete packets plus the updated channel reassembly state. **Compilation flags:** `static` **Template:** `reassemble_tm_packets(Frame,SecondaryHeaderLength,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_tm_packets(+compound,+integer,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The TM frame sequence is discontinuous: `domain_error(ccsds_tm_transfer_frame_sequence,tm_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current TM frame counter moduli differ: `domain_error(ccsds_tm_transfer_frame_counter_modulus,tm_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_tm_packets/6` Extracts the packet zone from a TM transfer frame, applies the selected discontinuity recovery policy when frame-count continuity is broken, and returns the complete packets plus the updated channel reassembly state. **Compilation flags:** `static` **Template:** `reassemble_tm_packets(Frame,SecondaryHeaderLength,Policy,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_tm_packets(+compound,+integer,+atom,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, `Policy`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The TM frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tm_transfer_frame_sequence,tm_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current TM frame counter moduli differ: `domain_error(ccsds_tm_transfer_frame_counter_modulus,tm_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_tm_packets/7` Extracts the packet zone from a TM transfer frame, applies the selected discontinuity recovery policy when frame-count continuity is broken, and returns the complete packets, updated channel reassembly state, and explicit recovery events. **Compilation flags:** `static` **Template:** `reassemble_tm_packets(Frame,SecondaryHeaderLength,Policy,State,Packets,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_tm_packets(+compound,+integer,+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, `Policy`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The TM frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tm_transfer_frame_sequence,tm_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current TM frame counter moduli differ: `domain_error(ccsds_tm_transfer_frame_counter_modulus,tm_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_tm_frames/5` Reassembles complete packets across a sequence of TM transfer frames using the default `throw` discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_tm_frames(Frames,SecondaryHeaderLength,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_tm_frames(+list(compound),+integer,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, or `State` is a variable: `instantiation_error` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` The TM frame sequence is discontinuous: `domain_error(ccsds_tm_transfer_frame_sequence,tm_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current TM frame counter moduli differ: `domain_error(ccsds_tm_transfer_frame_counter_modulus,tm_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_tm_frames/6` Reassembles complete packets across a sequence of TM transfer frames using the selected discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_tm_frames(Frames,SecondaryHeaderLength,Policy,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_tm_frames(+list(compound),+integer,+atom,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, `Policy`, or `State` is a variable: `instantiation_error` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` The TM frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tm_transfer_frame_sequence,tm_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current TM frame counter moduli differ: `domain_error(ccsds_tm_transfer_frame_counter_modulus,tm_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_tm_frames/7` Reassembles complete packets across a sequence of TM transfer frames using the selected discontinuity recovery policy and returns any recovery events in frame order. **Compilation flags:** `static` **Template:** `reassemble_tm_frames(Frames,SecondaryHeaderLength,Policy,State,Packets,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_tm_frames(+list(compound),+integer,+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, `Policy`, or `State` is a variable: `instantiation_error` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` The TM frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tm_transfer_frame_sequence,tm_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current TM frame counter moduli differ: `domain_error(ccsds_tm_transfer_frame_counter_modulus,tm_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_aos_packets/5` Extracts the packet zone from an AOS transfer frame, using the default `throw` discontinuity recovery policy, and returns the complete packets plus the updated channel reassembly state. **Compilation flags:** `static` **Template:** `reassemble_aos_packets(Frame,SecondaryHeaderLength,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_aos_packets(+compound,+integer,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The AOS frame sequence is discontinuous: `domain_error(ccsds_aos_transfer_frame_sequence,aos_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current AOS frame counter moduli differ: `domain_error(ccsds_aos_transfer_frame_counter_modulus,aos_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_aos_packets/6` Extracts the packet zone from an AOS transfer frame, applies the selected discontinuity recovery policy when frame-count continuity is broken, and returns the complete packets plus the updated channel reassembly state. **Compilation flags:** `static` **Template:** `reassemble_aos_packets(Frame,SecondaryHeaderLength,Policy,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_aos_packets(+compound,+integer,+atom,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, `Policy`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The AOS frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_aos_transfer_frame_sequence,aos_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current AOS frame counter moduli differ: `domain_error(ccsds_aos_transfer_frame_counter_modulus,aos_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_aos_packets/7` Extracts the packet zone from an AOS transfer frame, applies the selected discontinuity recovery policy when frame-count continuity is broken, and returns the complete packets, updated channel reassembly state, and explicit recovery events. **Compilation flags:** `static` **Template:** `reassemble_aos_packets(Frame,SecondaryHeaderLength,Policy,State,Packets,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_aos_packets(+compound,+integer,+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, `Policy`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` The AOS frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_aos_transfer_frame_sequence,aos_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current AOS frame counter moduli differ: `domain_error(ccsds_aos_transfer_frame_counter_modulus,aos_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_aos_frames/5` Reassembles complete packets across a sequence of AOS transfer frames using the default `throw` discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_aos_frames(Frames,SecondaryHeaderLength,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_aos_frames(+list(compound),+integer,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, or `State` is a variable: `instantiation_error` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` The AOS frame sequence is discontinuous: `domain_error(ccsds_aos_transfer_frame_sequence,aos_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current AOS frame counter moduli differ: `domain_error(ccsds_aos_transfer_frame_counter_modulus,aos_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_aos_frames/6` Reassembles complete packets across a sequence of AOS transfer frames using the selected discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_aos_frames(Frames,SecondaryHeaderLength,Policy,State,Packets,UpdatedState)` **Mode and number of proofs:** `reassemble_aos_frames(+list(compound),+integer,+atom,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, `Policy`, or `State` is a variable: `instantiation_error` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` The AOS frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_aos_transfer_frame_sequence,aos_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current AOS frame counter moduli differ: `domain_error(ccsds_aos_transfer_frame_counter_modulus,aos_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ###### `reassemble_aos_frames/7` Reassembles complete packets across a sequence of AOS transfer frames using the selected discontinuity recovery policy and returns any recovery events in frame order. **Compilation flags:** `static` **Template:** `reassemble_aos_frames(Frames,SecondaryHeaderLength,Policy,State,Packets,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_aos_frames(+list(compound),+integer,+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, `Policy`, or `State` is a variable: `instantiation_error` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `Policy` is neither a variable nor a valid discontinuity recovery policy: `domain_error(ccsds_discontinuity_policy,Policy)` `State` is neither a variable nor a valid channel reassembly state term: `domain_error(ccsds_channel_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` The AOS frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_aos_transfer_frame_sequence,aos_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedFrameCount,VirtualChannelFrameCount))` The stored and current AOS frame counter moduli differ: `domain_error(ccsds_aos_transfer_frame_counter_modulus,aos_transfer_frame_counter_modulus(SpacecraftId,VirtualChannelId,StoredCounterModulus,CounterModulus))` A pending fragment cannot be continued by the packet zone prefix data: `domain_error(ccsds_packet_reassembly_continuation,packet_reassembly_state(PendingData))` A continuation fragment is followed by a new packet before the previous packet is completed: `domain_error(ccsds_packet_reassembly_continuation,incomplete_continuation_before_new_packet)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ccsds_packetization") **object** #### `ccsds_packetization` Helpers for packetizing CCSDS space packets into TM and AOS service-data regions with cross-frame carryover and idle fill generation. **Availability:** `logtalk_load(ccsds_packetization(loader))` **Author:** Paulo Moura **Version:** 1:0:2 **Date:** 2026-06-16 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ccsds_packets(SecondaryHeaderLength) list type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `initial_state/1` - `pending_packets/2` - `packetize_tm_packets/6` - `packetize_tm_packets/7` - `packetize_aos_packets/6` - `packetize_aos_packets/7` - `packetize_tm_frames/7` - `packetize_tm_frames/8` - `packetize_aos_frames/7` - `packetize_aos_frames/8` - `generate_idle_packet/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `initial_state/1` Returns the initial packetizer state. **Compilation flags:** `static` **Template:** `initial_state(State)` **Mode and number of proofs:** `initial_state(-compound)` - `one` ------------------------------------------------------------------------ ###### `pending_packets/2` Extracts the non-empty queued packets and pending trailing packet bytes buffered per frame type, spacecraft identifier, and virtual channel identifier. **Compilation flags:** `static` **Template:** `pending_packets(State,PendingPackets)` **Mode and number of proofs:** `pending_packets(+compound,-list(compound))` - `one_or_error` **Exceptions:** `State` is a variable: `instantiation_error` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` ------------------------------------------------------------------------ ###### `packetize_tm_packets/6` Packetizes packets into the packet service region of a TM transfer frame, preserving any still-pending trailing packet bytes and queuing packets that do not fully fit. **Compilation flags:** `static` **Template:** `packetize_tm_packets(Frame,SecondaryHeaderLength,State,Packets,UpdatedFrame,UpdatedState)` **Mode and number of proofs:** `packetize_tm_packets(+compound,+integer,+compound,+list(compound),-compound,-compound)` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, `State`, or `Packets` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` `Packets` is neither a variable nor a valid list of CCSDS packet terms: `domain_error(ccsds_packet_terms,Packets)` ------------------------------------------------------------------------ ###### `packetize_tm_packets/7` Packetizes packets into the packet service region of a TM transfer frame and also returns explicit packetization events. **Compilation flags:** `static` **Template:** `packetize_tm_packets(Frame,SecondaryHeaderLength,State,Packets,UpdatedFrame,UpdatedState,Events)` **Mode and number of proofs:** `packetize_tm_packets(+compound,+integer,+compound,+list(compound),-compound,-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, `State`, or `Packets` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid TM transfer frame term: `domain_error(ccsds_tm_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` `Packets` is neither a variable nor a valid list of CCSDS packet terms: `domain_error(ccsds_packet_terms,Packets)` ------------------------------------------------------------------------ ###### `packetize_aos_packets/6` Packetizes packets into the packet service region of an AOS transfer frame, preserving any still-pending trailing packet bytes and queuing packets that do not fully fit. **Compilation flags:** `static` **Template:** `packetize_aos_packets(Frame,SecondaryHeaderLength,State,Packets,UpdatedFrame,UpdatedState)` **Mode and number of proofs:** `packetize_aos_packets(+compound,+integer,+compound,+list(compound),-compound,-compound)` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, `State`, or `Packets` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` `Packets` is neither a variable nor a valid list of CCSDS packet terms: `domain_error(ccsds_packet_terms,Packets)` ------------------------------------------------------------------------ ###### `packetize_aos_packets/7` Packetizes packets into the packet service region of an AOS transfer frame and also returns explicit packetization events. **Compilation flags:** `static` **Template:** `packetize_aos_packets(Frame,SecondaryHeaderLength,State,Packets,UpdatedFrame,UpdatedState,Events)` **Mode and number of proofs:** `packetize_aos_packets(+compound,+integer,+compound,+list(compound),-compound,-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frame`, `SecondaryHeaderLength`, `State`, or `Packets` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid AOS transfer frame term: `domain_error(ccsds_aos_transfer_frame_term,Frame)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` `Packets` is neither a variable nor a valid list of CCSDS packet terms: `domain_error(ccsds_packet_terms,Packets)` ------------------------------------------------------------------------ ###### `packetize_tm_frames/7` Packetizes packets across a sequence of TM transfer frames. Packets that remain queued for the first frame channel are also returned. **Compilation flags:** `static` **Template:** `packetize_tm_frames(Frames,SecondaryHeaderLength,State,Packets,UpdatedFrames,RemainingPackets,UpdatedState)` **Mode and number of proofs:** `packetize_tm_frames(+list(compound),+integer,+compound,+list(compound),-list(compound),-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, `State`, or `Packets` is a variable: `instantiation_error` `Frames` is neither a variable nor a valid list of TM transfer frame terms: `domain_error(ccsds_tm_transfer_frame_terms,Frames)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` `Packets` is neither a variable nor a valid list of CCSDS packet terms: `domain_error(ccsds_packet_terms,Packets)` ------------------------------------------------------------------------ ###### `packetize_tm_frames/8` Packetizes packets across a sequence of TM transfer frames and also returns explicit packetization events in frame order. **Compilation flags:** `static` **Template:** `packetize_tm_frames(Frames,SecondaryHeaderLength,State,Packets,UpdatedFrames,RemainingPackets,UpdatedState,Events)` **Mode and number of proofs:** `packetize_tm_frames(+list(compound),+integer,+compound,+list(compound),-list(compound),-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, `State`, or `Packets` is a variable: `instantiation_error` `Frames` is neither a variable nor a valid list of TM transfer frame terms: `domain_error(ccsds_tm_transfer_frame_terms,Frames)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` `Packets` is neither a variable nor a valid list of CCSDS packet terms: `domain_error(ccsds_packet_terms,Packets)` ------------------------------------------------------------------------ ###### `packetize_aos_frames/7` Packetizes packets across a sequence of AOS transfer frames. Packets that remain queued for the first frame channel are also returned. **Compilation flags:** `static` **Template:** `packetize_aos_frames(Frames,SecondaryHeaderLength,State,Packets,UpdatedFrames,RemainingPackets,UpdatedState)` **Mode and number of proofs:** `packetize_aos_frames(+list(compound),+integer,+compound,+list(compound),-list(compound),-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, `State`, or `Packets` is a variable: `instantiation_error` `Frames` is neither a variable nor a valid list of AOS transfer frame terms: `domain_error(ccsds_aos_transfer_frame_terms,Frames)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` `Packets` is neither a variable nor a valid list of CCSDS packet terms: `domain_error(ccsds_packet_terms,Packets)` ------------------------------------------------------------------------ ###### `packetize_aos_frames/8` Packetizes packets across a sequence of AOS transfer frames and also returns explicit packetization events in frame order. **Compilation flags:** `static` **Template:** `packetize_aos_frames(Frames,SecondaryHeaderLength,State,Packets,UpdatedFrames,RemainingPackets,UpdatedState,Events)` **Mode and number of proofs:** `packetize_aos_frames(+list(compound),+integer,+compound,+list(compound),-list(compound),-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frames`, `SecondaryHeaderLength`, `State`, or `Packets` is a variable: `instantiation_error` `Frames` is neither a variable nor a valid list of AOS transfer frame terms: `domain_error(ccsds_aos_transfer_frame_terms,Frames)` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `State` is neither a variable nor a valid packetizer state term: `domain_error(ccsds_packetizer_state,State)` `Packets` is neither a variable nor a valid list of CCSDS packet terms: `domain_error(ccsds_packet_terms,Packets)` ------------------------------------------------------------------------ ###### `generate_idle_packet/4` Generates a telemetry idle packet using APID 2047, the given packet secondary header length, sequence count, and user-data length. **Compilation flags:** `static` **Template:** `generate_idle_packet(SecondaryHeaderLength,SequenceCount,UserDataLength,Packet)` **Mode and number of proofs:** `generate_idle_packet(+integer,+integer,+integer,-compound)` - `one_or_error` **Exceptions:** `SecondaryHeaderLength`, `SequenceCount`, or `UserDataLength` is a variable: `instantiation_error` `SecondaryHeaderLength` is neither a variable nor a valid CCSDS packet secondary header length: `domain_error(ccsds_secondary_header_length,SecondaryHeaderLength)` `SequenceCount` is neither a variable nor a valid CCSDS packet sequence count: `domain_error(ccsds_packet_sequence_count,SequenceCount)` `UserDataLength` is neither a variable nor a valid idle-packet user-data length: `domain_error(ccsds_idle_user_data_length,UserDataLength)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ccsds_packets") **object** #### `ccsds_packets` CCSDS Space Packet parser with no secondary header parsing. For secondary header support, use ccsds_packets(Length) where Length is the secondary header size in bytes. **Availability:** `logtalk_load(ccsds_packets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2025-12-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` ccsds_packets(0) **Remarks:** (none) **Inherited public predicates:**  apid/2  data_length/2  generate/2  generate/3  parse/2  secondary_header/2  secondary_header_flag/2  secondary_header_time/3  sequence_count/2  sequence_flags/2  type/2  user_data/2  version/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `ccsds_packets(SecondaryHeaderLength)` - `SecondaryHeaderLength` - Length in bytes of the secondary header when present (0 for no secondary header parsing, or a positive integer). CCSDS Space Packet parser following the CCSDS 133.0-B-2 standard. Parses binary packet data including optional secondary headers. **Availability:** `logtalk_load(ccsds_packets(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-24 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ccsds_time_fields list reader **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `generate/3` - `version/2` - `type/2` - `secondary_header_flag/2` - `apid/2` - `sequence_flags/2` - `sequence_count/2` - `data_length/2` - `user_data/2` - `secondary_header/2` - `secondary_header_time/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses CCSDS packet(s) from a source into a list of packet terms. The source can be `file(File)`, `stream(Stream)`, or `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `parse(Source,Packets)` **Mode and number of proofs:** `parse(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(ccsds_source,Source)` `Source` is a valid source but the data cannot be parsed as a CCSDS packet: `domain_error(ccsds_byte_sequence,Bytes)` ------------------------------------------------------------------------ ###### `generate/2` Generates CCSDS packet bytes to a sink from a list of packet terms. The sink can be `file(File)`, `stream(Stream)`, or `bytes(Bytes)`. For `file(File)` and `stream(Stream)`, writes to the binary file or stream. For `bytes(Bytes)`, unifies Bytes with the generated byte list. **Compilation flags:** `static` **Template:** `generate(Sink,Packets)` **Mode and number of proofs:** `generate(+compound,+list(compound))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid sink: `domain_error(ccsds_sink,Sink)` `Packets` is a partial list or a list with an element `Packet` which is a variable: `instantiation_error` An element `Packet` of the list `Packets` is neither a variable nor a valid CCSDS packet term: `domain_error(ccsds_packet_term,Packet)` ------------------------------------------------------------------------ ###### `generate/3` Generates a list of bytes from a CCSDS packet term with an open tail. Mainly used when generating arbitrary CCSDS packets. **Compilation flags:** `static` **Template:** `generate(Packet,Bytes,Tail)` **Mode and number of proofs:** `generate(+compound,-list(byte),--variable)` - `one_or_error` **Exceptions:** `Packet` is a variable: `instantiation_error` `Packet` is neither a variable nor a valid CCSDS packet term: `domain_error(ccsds_packet_term,Packet)` ------------------------------------------------------------------------ ###### `version/2` Extracts the version number from a packet (always 0 for CCSDS Space Packets). **Compilation flags:** `static` **Template:** `version(Packet,Version)` **Mode and number of proofs:** `version(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `type/2` Extracts the packet type from a packet. Returns `telemetry` or `telecommand`. **Compilation flags:** `static` **Template:** `type(Packet,Type)` **Mode and number of proofs:** `type(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `secondary_header_flag/2` Extracts the secondary header flag. Returns `absent` or `present`. **Compilation flags:** `static` **Template:** `secondary_header_flag(Packet,Flag)` **Mode and number of proofs:** `secondary_header_flag(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `apid/2` Extracts the Application Process Identifier (APID) from a packet. **Compilation flags:** `static` **Template:** `apid(Packet,APID)` **Mode and number of proofs:** `apid(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `sequence_flags/2` Extracts the sequence flags. Returns `continuation`, `first`, `last`, or `standalone`. **Compilation flags:** `static` **Template:** `sequence_flags(Packet,Flags)` **Mode and number of proofs:** `sequence_flags(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `sequence_count/2` Extracts the packet sequence count (0-16383). **Compilation flags:** `static` **Template:** `sequence_count(Packet,Count)` **Mode and number of proofs:** `sequence_count(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `data_length/2` Extracts the packet data length field value. **Compilation flags:** `static` **Template:** `data_length(Packet,Length)` **Mode and number of proofs:** `data_length(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `user_data/2` Extracts the user data field as a list of bytes. **Compilation flags:** `static` **Template:** `user_data(Packet,Data)` **Mode and number of proofs:** `user_data(+compound,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `secondary_header/2` Extracts the secondary header. Returns none if not present, or secondary_header(Bytes) with the raw bytes. **Compilation flags:** `static` **Template:** `secondary_header(Packet,SecondaryHeader)` **Mode and number of proofs:** `secondary_header(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `secondary_header_time/3` Parses time from a packet secondary header. When `Descriptor` is a variable, the secondary header is parsed as a self-describing CCSDS time field. When `Descriptor` is instantiated, it is used to parse the raw T-field bytes. **Compilation flags:** `static` **Template:** `secondary_header_time(Packet,Descriptor,TimeCode)` **Mode and number of proofs:** `secondary_header_time(+compound,?compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `ccsds_packets_types` Type definitions and arbitrary generators for CCSDS packets. **Availability:** `logtalk_load(ccsds_packets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-08 **Compilation flags:** `static` **Provides:** type::type/1 type::check/2 arbitrary::arbitrary/1 arbitrary::arbitrary/2 **Uses:** ccsds_packets(SecondaryHeaderLength) type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ccsds_tc_services") **object** #### `ccsds_tc_services` Helpers for CCSDS telecommand segment extraction, insertion, and cross-frame TC service reassembly. **Availability:** `logtalk_load(ccsds_tc_services(loader))` **Author:** Paulo Moura **Version:** 0:1:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid_segment/1` - `sequence_flags/2` - `map_id/2` - `valid_map_dispatch/1` - `dispatch_map_id/2` - `dispatch_service_units/2` - `segment_header_suffix/2` - `valid_reassembled_segment/1` - `segment_header_suffixes/2` - `segment_data/2` - `valid_reassembly_state/1` - `initial_reassembly_state/1` - `pending_fragments/2` - `valid_discontinuity_policy/1` - `extract_tc_segment/2` - `insert_tc_segment/3` - `reassemble_tc_frame/4` - `reassemble_tc_frame/5` - `reassemble_tc_frame/6` - `reassemble_tc_frames/4` - `reassemble_tc_frames/5` - `reassemble_tc_frames/6` - `reassemble_tc_frame_with_provenance/5` - `reassemble_tc_frame_with_provenance/6` - `reassemble_tc_frames_with_provenance/5` - `reassemble_tc_frames_with_provenance/6` - `dispatch_service_units_by_map/2` - `dispatch_service_units_by_map/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_segment/1` True if the argument is a valid CCSDS telecommand segment term. **Compilation flags:** `static` **Template:** `valid_segment(Segment)` **Mode and number of proofs:** `valid_segment(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sequence_flags/2` Extracts the telecommand segment sequence flags. **Compilation flags:** `static` **Template:** `sequence_flags(Segment,SequenceFlags)` **Mode and number of proofs:** `sequence_flags(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `map_id/2` Extracts the telecommand service-unit MAP identifier from either a telecommand segment term or a provenance-aware reassembled telecommand service-unit term. **Compilation flags:** `static` **Template:** `map_id(ServiceUnit,MapId)` **Mode and number of proofs:** `map_id(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `valid_map_dispatch/1` True if the argument is a valid MAP-aware dispatch term grouping complete telecommand service units for a single MAP identifier. **Compilation flags:** `static` **Template:** `valid_map_dispatch(Dispatch)` **Mode and number of proofs:** `valid_map_dispatch(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `dispatch_map_id/2` Extracts the MAP identifier from a MAP-aware dispatch term. **Compilation flags:** `static` **Template:** `dispatch_map_id(Dispatch,MapId)` **Mode and number of proofs:** `dispatch_map_id(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `dispatch_service_units/2` Extracts the complete telecommand service units from a MAP-aware dispatch term. **Compilation flags:** `static` **Template:** `dispatch_service_units(Dispatch,ServiceUnits)` **Mode and number of proofs:** `dispatch_service_units(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `segment_header_suffix/2` Extracts the mission-specific segment-header suffix bytes. Returns the empty list when the segment has no mission-specific suffix. **Compilation flags:** `static` **Template:** `segment_header_suffix(Segment,HeaderSuffix)` **Mode and number of proofs:** `segment_header_suffix(+compound,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `valid_reassembled_segment/1` True if the argument is a valid provenance-aware reassembled telecommand service-unit term. **Compilation flags:** `static` **Template:** `valid_reassembled_segment(ReassembledSegment)` **Mode and number of proofs:** `valid_reassembled_segment(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `segment_header_suffixes/2` Extracts the ordered list of per-frame mission-specific segment-header suffixes that contributed to a provenance-aware reassembled telecommand service-unit term. **Compilation flags:** `static` **Template:** `segment_header_suffixes(ReassembledSegment,HeaderSuffixes)` **Mode and number of proofs:** `segment_header_suffixes(+compound,-list(list(byte)))` - `one` ------------------------------------------------------------------------ ###### `segment_data/2` Extracts the telecommand segment data bytes. **Compilation flags:** `static` **Template:** `segment_data(Segment,Data)` **Mode and number of proofs:** `segment_data(+compound,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `valid_reassembly_state/1` True if the argument is a valid telecommand segment reassembly state term. **Compilation flags:** `static` **Template:** `valid_reassembly_state(State)` **Mode and number of proofs:** `valid_reassembly_state(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `initial_reassembly_state/1` Returns the initial telecommand segment reassembly state. **Compilation flags:** `static` **Template:** `initial_reassembly_state(State)` **Mode and number of proofs:** `initial_reassembly_state(-compound)` - `one` ------------------------------------------------------------------------ ###### `pending_fragments/2` Extracts the pending segmented telecommand data fragments keyed by spacecraft, virtual channel, and MAP identifier. **Compilation flags:** `static` **Template:** `pending_fragments(State,PendingFragments)` **Mode and number of proofs:** `pending_fragments(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `valid_discontinuity_policy/1` True if the argument is a valid discontinuity recovery policy atom. Valid values are `throw`, `drop`, and `resynchronize`. **Compilation flags:** `static` **Template:** `valid_discontinuity_policy(Policy)` **Mode and number of proofs:** `valid_discontinuity_policy(@atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `extract_tc_segment/2` Extracts a telecommand segment from a telecommand transfer frame using the representation `tc_segment(SequenceFlags,`` ``MapId,`` ``HeaderSuffix,`` ``Data)`. When mission-specific segment headers use multiple octets, only the first octet is interpreted for the standard MAP and sequence semantics and the remaining octets are returned as `HeaderSuffix`. **Compilation flags:** `static` **Template:** `extract_tc_segment(Frame,Segment)` **Mode and number of proofs:** `extract_tc_segment(+compound,-compound)` - `one_or_error` **Exceptions:** `Frame` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` ------------------------------------------------------------------------ ###### `insert_tc_segment/3` Updates a telecommand transfer frame from a telecommand segment term by encoding the standard MAP and sequence semantics in the first segment-header octet and preserving any remaining mission-specific segment-header octets. **Compilation flags:** `static` **Template:** `insert_tc_segment(Segment,Frame,UpdatedFrame)` **Mode and number of proofs:** `insert_tc_segment(+compound,+compound,-compound)` - `one_or_error` **Exceptions:** `Segment` or `Frame` is a variable: `instantiation_error` `Segment` is neither a variable nor a valid telecommand segment term: `domain_error(ccsds_tc_segment,Segment)` `Frame` has an invalid telecommand segment header suffix encoding: `domain_error(ccsds_tc_segment_header,SegmentHeader)` ------------------------------------------------------------------------ ###### `reassemble_tc_frame/4` Reassembles complete telecommand service units from a single telecommand transfer frame using the default `throw` discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_tc_frame(Frame,State,Segments,UpdatedState)` **Mode and number of proofs:** `reassemble_tc_frame(+compound,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frame` or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` The telecommand frame sequence is discontinuous: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frame/5` Reassembles complete telecommand service units from a single telecommand transfer frame using the selected discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_tc_frame(Frame,Policy,State,Segments,UpdatedState)` **Mode and number of proofs:** `reassemble_tc_frame(+compound,+atom,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frame`, `Policy`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` `Policy` is neither a variable nor a valid telecommand discontinuity recovery policy: `domain_error(ccsds_tc_discontinuity_policy,Policy)` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` The telecommand frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frame/6` Reassembles complete telecommand service units from a single telecommand transfer frame using the selected discontinuity recovery policy and returns any recovery events. **Compilation flags:** `static` **Template:** `reassemble_tc_frame(Frame,Policy,State,Segments,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_tc_frame(+compound,+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frame`, `Policy`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` `Policy` is neither a variable nor a valid telecommand discontinuity recovery policy: `domain_error(ccsds_tc_discontinuity_policy,Policy)` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` The telecommand frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frames/4` Reassembles complete telecommand service units across a sequence of telecommand transfer frames using the default `throw` discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_tc_frames(Frames,State,Segments,UpdatedState)` **Mode and number of proofs:** `reassemble_tc_frames(+list(compound),+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frames` or `State` is a variable: `instantiation_error` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` The telecommand frame sequence is discontinuous: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frames/5` Reassembles complete telecommand service units across a sequence of telecommand transfer frames using the selected discontinuity recovery policy. **Compilation flags:** `static` **Template:** `reassemble_tc_frames(Frames,Policy,State,Segments,UpdatedState)` **Mode and number of proofs:** `reassemble_tc_frames(+list(compound),+atom,+compound,-list(compound),-compound)` - `one_or_error` **Exceptions:** `Frames`, `Policy`, or `State` is a variable: `instantiation_error` `Policy` is neither a variable nor a valid telecommand discontinuity recovery policy: `domain_error(ccsds_tc_discontinuity_policy,Policy)` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` The telecommand frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frames/6` Reassembles complete telecommand service units across a sequence of telecommand transfer frames using the selected discontinuity recovery policy and returns any recovery events in frame order. **Compilation flags:** `static` **Template:** `reassemble_tc_frames(Frames,Policy,State,Segments,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_tc_frames(+list(compound),+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frames`, `Policy`, or `State` is a variable: `instantiation_error` `Policy` is neither a variable nor a valid telecommand discontinuity recovery policy: `domain_error(ccsds_tc_discontinuity_policy,Policy)` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` The telecommand frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frame_with_provenance/5` Reassembles complete telecommand service units from a single telecommand transfer frame using the default `throw` discontinuity recovery policy and returns provenance-aware reassembled service-unit terms. **Compilation flags:** `static` **Template:** `reassemble_tc_frame_with_provenance(Frame,State,ReassembledSegments,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_tc_frame_with_provenance(+compound,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frame` or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` The telecommand frame sequence is discontinuous: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frame_with_provenance/6` Reassembles complete telecommand service units from a single telecommand transfer frame using the selected discontinuity recovery policy and returns provenance-aware reassembled service-unit terms plus any recovery events. **Compilation flags:** `static` **Template:** `reassemble_tc_frame_with_provenance(Frame,Policy,State,ReassembledSegments,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_tc_frame_with_provenance(+compound,+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frame`, `Policy`, or `State` is a variable: `instantiation_error` `Frame` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` `Policy` is neither a variable nor a valid telecommand discontinuity recovery policy: `domain_error(ccsds_tc_discontinuity_policy,Policy)` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` The telecommand frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frames_with_provenance/5` Reassembles complete telecommand service units across a sequence of telecommand transfer frames using the default `throw` discontinuity recovery policy and returns provenance-aware reassembled service-unit terms. **Compilation flags:** `static` **Template:** `reassemble_tc_frames_with_provenance(Frames,State,ReassembledSegments,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_tc_frames_with_provenance(+list(compound),+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frames` or `State` is a variable: `instantiation_error` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` The telecommand frame sequence is discontinuous: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `reassemble_tc_frames_with_provenance/6` Reassembles complete telecommand service units across a sequence of telecommand transfer frames using the selected discontinuity recovery policy and returns provenance-aware reassembled service-unit terms plus any recovery events in frame order. **Compilation flags:** `static` **Template:** `reassemble_tc_frames_with_provenance(Frames,Policy,State,ReassembledSegments,UpdatedState,Events)` **Mode and number of proofs:** `reassemble_tc_frames_with_provenance(+list(compound),+atom,+compound,-list(compound),-compound,-list(compound))` - `one_or_error` **Exceptions:** `Frames`, `Policy`, or `State` is a variable: `instantiation_error` `Policy` is neither a variable nor a valid telecommand discontinuity recovery policy: `domain_error(ccsds_tc_discontinuity_policy,Policy)` `State` is neither a variable nor a valid telecommand reassembly state term: `domain_error(ccsds_tc_reassembly_state,State)` An element `Frame` of `Frames` is neither a variable nor a valid telecommand transfer frame term: `domain_error(ccsds_tc_transfer_frame_term,Frame)` The telecommand frame sequence is discontinuous under the `throw` recovery policy: `domain_error(ccsds_tc_transfer_frame_sequence,tc_transfer_frame_sequence(SpacecraftId,VirtualChannelId,ExpectedSequenceNumber,SequenceNumber))` A telecommand segment starts a new reassembly while a previous segment for the same MAP is still pending: `domain_error(ccsds_tc_segment_reassembly,existing_pending_segment(MapId))` A telecommand continuation or last segment is missing its first segment: `domain_error(ccsds_tc_segment_reassembly,missing_first_segment(MapId))` ------------------------------------------------------------------------ ###### `dispatch_service_units_by_map/2` Groups complete telecommand service-unit terms by MAP identifier, preserving the original service-unit order within each MAP bucket and the first-seen order of MAP buckets. Accepts both telecommand segment terms and provenance-aware reassembled telecommand service-unit terms. **Compilation flags:** `static` **Template:** `dispatch_service_units_by_map(ServiceUnits,Dispatches)` **Mode and number of proofs:** `dispatch_service_units_by_map(+list(compound),-list(compound))` - `one_or_error` **Exceptions:** `ServiceUnits` is a variable: `instantiation_error` `ServiceUnits` is neither a variable nor a valid list of telecommand service units: `domain_error(ccsds_tc_service_units,ServiceUnits)` ------------------------------------------------------------------------ ###### `dispatch_service_units_by_map/3` Extracts the complete telecommand service units for a specific MAP identifier from a list of complete telecommand service-unit terms. **Compilation flags:** `static` **Template:** `dispatch_service_units_by_map(ServiceUnits,MapId,DispatchedServiceUnits)` **Mode and number of proofs:** `dispatch_service_units_by_map(+list(compound),+integer,-list(compound))` - `one_or_error` **Exceptions:** `ServiceUnits` or `MapId` is a variable: `instantiation_error` `ServiceUnits` is neither a variable nor a valid list of telecommand service units: `domain_error(ccsds_tc_service_units,ServiceUnits)` `MapId` is neither a variable nor a valid telecommand MAP identifier: `domain_error(ccsds_tc_map_id,MapId)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ccsds_time_codes") **object** #### `ccsds_ccs(CalendarVariant,FractionOctets)` - `CalendarVariant` - Calendar representation. Supported values are `calendar` and `day_of_year`. - `FractionOctets` - Number of BCD fraction octets. Supported values are non-negative integers. CCSDS calendar segmented time code parser and generator. **Availability:** `logtalk_load(ccsds_time_codes(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-24 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ccsds_time_code_protocol **Uses:** reader type **Remarks:** (none) **Inherited public predicates:**  epoch/1  format/1  from_unix_seconds/2  generate/2  generate/3  parse/2  unix_seconds/2  valid/1 - Public predicates - `year/2` - `day_of_year/2` - `month/2` - `day/2` - `time_of_day/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `year/2` Extracts the year value from a CCS time term. **Compilation flags:** `static` **Template:** `year(TimeCode,Year)` **Mode and number of proofs:** `year(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `day_of_year/2` Extracts the day of year from an ordinal CCS time term. **Compilation flags:** `static` **Template:** `day_of_year(TimeCode,DayOfYear)` **Mode and number of proofs:** `day_of_year(+compound,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `month/2` Extracts the month from a calendar CCS time term. **Compilation flags:** `static` **Template:** `month(TimeCode,Month)` **Mode and number of proofs:** `month(+compound,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `day/2` Extracts the day of month from a calendar CCS time term. **Compilation flags:** `static` **Template:** `day(TimeCode,Day)` **Mode and number of proofs:** `day(+compound,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `time_of_day/4` Extracts the hour, minute, and seconds-with-fraction from a CCS time term. **Compilation flags:** `static` **Template:** `time_of_day(TimeCode,Hour,Minute,Seconds)` **Mode and number of proofs:** `time_of_day(+compound,-integer,-integer,-number)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `ccsds_cds(DaySegmentOctets,SubmillisecondOctets,Epoch)` - `DaySegmentOctets` - Number of day segment octets. Supported values are `2` and `3`. - `SubmillisecondOctets` - Number of submillisecond octets. Supported values are `0`, `2`, and `4`. - `Epoch` - Epoch used when converting to and from Unix seconds. Supported values are `ccsds_epoch` and `unix_epoch`. CCSDS day segmented time code parser and generator. **Availability:** `logtalk_load(ccsds_time_codes(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-24 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ccsds_time_code_protocol **Uses:** reader type **Remarks:** (none) **Inherited public predicates:**  epoch/1  format/1  from_unix_seconds/2  generate/2  generate/3  parse/2  unix_seconds/2  valid/1 - Public predicates - `days/2` - `milliseconds/2` - `submilliseconds/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `days/2` Extracts the day segment value from a CDS time term. **Compilation flags:** `static` **Template:** `days(TimeCode,Days)` **Mode and number of proofs:** `days(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `milliseconds/2` Extracts the millisecond-of-day value from a CDS time term. **Compilation flags:** `static` **Template:** `milliseconds(TimeCode,Milliseconds)` **Mode and number of proofs:** `milliseconds(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `submilliseconds/2` Extracts the optional submillisecond value from a CDS time term. Two-octet objects use microseconds; four-octet objects use picoseconds within the millisecond. **Compilation flags:** `static` **Template:** `submilliseconds(TimeCode,Submilliseconds)` **Mode and number of proofs:** `submilliseconds(+compound,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `ccsds_cuc(CoarseOctets,FineOctets,Epoch)` - `CoarseOctets` - Number of coarse time octets. - `FineOctets` - Number of fine time octets. - `Epoch` - Epoch used when converting to and from Unix seconds. Supported values are `ccsds_epoch` and `unix_epoch`. CCSDS unsegmented time code parser and generator. **Availability:** `logtalk_load(ccsds_time_codes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ccsds_time_code_protocol **Uses:** list reader **Remarks:** (none) **Inherited public predicates:**  epoch/1  format/1  from_unix_seconds/2  generate/2  generate/3  parse/2  unix_seconds/2  valid/1 - Public predicates - `coarse/2` - `fine/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `coarse/2` Extracts the coarse field from a CUC time term. **Compilation flags:** `static` **Template:** `coarse(TimeCode,Coarse)` **Mode and number of proofs:** `coarse(+compound,-integer)` - `one` ------------------------------------------------------------------------ ###### `fine/2` Extracts the fine field from a CUC time term. **Compilation flags:** `static` **Template:** `fine(TimeCode,Fine)` **Mode and number of proofs:** `fine(+compound,-integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `ccsds_time_code_protocol` CCSDS time code parser and generator protocol. **Availability:** `logtalk_load(ccsds_time_codes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `generate/3` - `valid/1` - `format/1` - `epoch/1` - `unix_seconds/2` - `from_unix_seconds/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a CCSDS time code from a source term. Supported source terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `parse(Source,TimeCode)` **Mode and number of proofs:** `parse(+compound,-compound)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(ccsds_time_code_source,Source)` `Source` contents are not a valid encoding for the selected time code object: `domain_error(ccsds_time_code_byte_sequence,Bytes)` ------------------------------------------------------------------------ ###### `generate/2` Generates a CCSDS time code to a sink term. Supported sink terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `generate(Sink,TimeCode)` **Mode and number of proofs:** `generate(+compound,+compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid sink: `domain_error(ccsds_time_code_sink,Sink)` `TimeCode` is neither a variable nor a valid time code term for the selected object: `domain_error(ccsds_time_code_term,TimeCode)` ------------------------------------------------------------------------ ###### `generate/3` Generates a list of bytes from a CCSDS time code term with an open tail. Mainly used when generating arbitrary values. **Compilation flags:** `static` **Template:** `generate(TimeCode,Bytes,Tail)` **Mode and number of proofs:** `generate(+compound,-list(byte),--variable)` - `one_or_error` **Exceptions:** `TimeCode` is a variable: `instantiation_error` `TimeCode` is neither a variable nor a valid time code term for the selected object: `domain_error(ccsds_time_code_term,TimeCode)` ------------------------------------------------------------------------ ###### `valid/1` True if the argument is a valid time code term for the selected object. **Compilation flags:** `static` **Template:** `valid(TimeCode)` **Mode and number of proofs:** `valid(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `format/1` Returns the CCSDS time code format handled by the object. **Compilation flags:** `static` **Template:** `format(Format)` **Mode and number of proofs:** `format(-atom)` - `one` ------------------------------------------------------------------------ ###### `epoch/1` Returns the epoch used by the object. **Compilation flags:** `static` **Template:** `epoch(Epoch)` **Mode and number of proofs:** `epoch(-atom)` - `one` ------------------------------------------------------------------------ ###### `unix_seconds/2` Converts a time code term into a Unix timestamp in seconds. **Compilation flags:** `static` **Template:** `unix_seconds(TimeCode,Seconds)` **Mode and number of proofs:** `unix_seconds(+compound,-number)` - `one_or_error` **Exceptions:** `TimeCode` is a variable: `instantiation_error` `TimeCode` is neither a variable nor a valid time code term for the selected object: `domain_error(ccsds_time_code_term,TimeCode)` ------------------------------------------------------------------------ ###### `from_unix_seconds/2` Converts a Unix timestamp in seconds into a time code term for the selected object. **Compilation flags:** `static` **Template:** `from_unix_seconds(Seconds,TimeCode)` **Mode and number of proofs:** `from_unix_seconds(+number,-compound)` - `one_or_error` **Exceptions:** `Seconds` is a variable: `instantiation_error` `Seconds` cannot be represented using the selected object: `domain_error(ccsds_time_code_unix_seconds,Seconds)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `ccsds_time_codes` Helpers for introspecting CCSDS time code terms. **Availability:** `logtalk_load(ccsds_time_codes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-08 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid/1` - `format/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid/1` True if the argument is a known CCSDS time code term. **Compilation flags:** `static` **Template:** `valid(TimeCode)` **Mode and number of proofs:** `valid(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `format/2` Returns the CCSDS time code format for a known time code term. **Compilation flags:** `static` **Template:** `format(TimeCode,Format)` **Mode and number of proofs:** `format(+compound,-atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `ccsds_time_codes_types` Type definitions and arbitrary generators for CCSDS time codes. **Availability:** `logtalk_load(ccsds_time_codes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-08 **Compilation flags:** `static` **Provides:** type::type/1 type::check/2 arbitrary::arbitrary/1 arbitrary::arbitrary/2 **Uses:** ccsds_ccs(CalendarVariant,FractionOctets) ccsds_cds(DaySegmentOctets,SubmillisecondOctets,Epoch) ccsds_cuc(CoarseOctets,FineOctets,Epoch) type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ccsds_time_fields") **object** #### `ccsds_time_fields` Helpers for parsing and generating self-describing CCSDS time fields using descriptor terms and the existing CCSDS time-code objects. **Availability:** `logtalk_load(ccsds_time_fields(loader))` **Author:** Paulo Moura **Version:** 1:0:2 **Date:** 2026-07-20 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** reader type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid_descriptor/1` - `parse/3` - `generate/3` - `format/2` - `epoch/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_descriptor/1` True if the argument is a supported CCSDS time-field descriptor term. **Compilation flags:** `static` **Template:** `valid_descriptor(Descriptor)` **Mode and number of proofs:** `valid_descriptor(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse/3` Parses a self-describing CCSDS time field from a source term into a descriptor term and a time-code term. Supported source terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `parse(Source,Descriptor,TimeCode)` **Mode and number of proofs:** `parse(+compound,?compound,-compound)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(ccsds_time_field_source,Source)` `Source` contents are not a supported CCSDS time field: `domain_error(ccsds_time_field_byte_sequence,Bytes)` ------------------------------------------------------------------------ ###### `generate/3` Generates a self-describing CCSDS time field to a sink term from a descriptor term and a time-code term. Supported sink terms are `file(File)`, `stream(Stream)`, and `bytes(Bytes)`. **Compilation flags:** `static` **Template:** `generate(Sink,Descriptor,TimeCode)` **Mode and number of proofs:** `generate(+compound,+compound,+compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Descriptor` is a variable: `instantiation_error` `TimeCode` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid sink: `domain_error(ccsds_time_field_sink,Sink)` `Descriptor` is neither a variable nor a supported descriptor term: `domain_error(ccsds_time_field_descriptor,Descriptor)` `TimeCode` is neither a variable nor a valid time code term for the selected descriptor: `domain_error(ccsds_time_code_term,TimeCode)` ------------------------------------------------------------------------ ###### `format/2` Returns the CCSDS time-code format selected by a descriptor term. **Compilation flags:** `static` **Template:** `format(Descriptor,Format)` **Mode and number of proofs:** `format(+compound,-atom)` - `one_or_error` **Exceptions:** `Descriptor` is a variable: `instantiation_error` `Descriptor` is neither a variable nor a supported CCSDS time-field descriptor term: `domain_error(ccsds_time_field_descriptor,Descriptor)` ------------------------------------------------------------------------ ###### `epoch/2` Returns the epoch selected by a descriptor term. Calendar segmented descriptors return `none`. **Compilation flags:** `static` **Template:** `epoch(Descriptor,Epoch)` **Mode and number of proofs:** `epoch(+compound,-atom)` - `one_or_error` **Exceptions:** `Descriptor` is a variable: `instantiation_error` `Descriptor` is neither a variable nor a supported CCSDS time-field descriptor term: `domain_error(ccsds_time_field_descriptor,Descriptor)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### character_sets") **category** #### `character_set` Shared implementation support category for character set objects. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static` **Implements:** `public` character_set_protocol **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - `valid_unicode_scalar/1` - `continuation_byte/1` - `high_surrogate/1` - `low_surrogate/1` - `word_bytes/4` - `dword_bytes/6` - `bytes_word/4` - `bytes_dword/6` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `valid_unicode_scalar/1` True if the argument is a valid Unicode scalar value. **Compilation flags:** `static` **Template:** `valid_unicode_scalar(Code)` **Mode and number of proofs:** `valid_unicode_scalar(+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `continuation_byte/1` True if the argument is a valid UTF continuation byte. **Compilation flags:** `static` **Template:** `continuation_byte(Byte)` **Mode and number of proofs:** `continuation_byte(+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `high_surrogate/1` True if the argument is a UTF-16 high surrogate code point. **Compilation flags:** `static` **Template:** `high_surrogate(Code)` **Mode and number of proofs:** `high_surrogate(+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `low_surrogate/1` True if the argument is a UTF-16 low surrogate code point. **Compilation flags:** `static` **Template:** `low_surrogate(Code)` **Mode and number of proofs:** `low_surrogate(+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `word_bytes/4` Converts a 16-bit word into two bytes using the given byte order. **Compilation flags:** `static` **Template:** `word_bytes(Endian,Word,Byte1,Byte2)` **Mode and number of proofs:** `word_bytes(+atom,+integer,-integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `dword_bytes/6` Converts a 32-bit word into four bytes using the given byte order. **Compilation flags:** `static` **Template:** `dword_bytes(Endian,Word,Byte1,Byte2,Byte3,Byte4)` **Mode and number of proofs:** `dword_bytes(+atom,+integer,-integer,-integer,-integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `bytes_word/4` Converts two bytes into a 16-bit word using the given byte order. **Compilation flags:** `static` **Template:** `bytes_word(Endian,Byte1,Byte2,Word)` **Mode and number of proofs:** `bytes_word(+atom,+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `bytes_dword/6` Converts four bytes into a 32-bit word using the given byte order. **Compilation flags:** `static` **Template:** `bytes_dword(Endian,Byte1,Byte2,Byte3,Byte4,Word)` **Mode and number of proofs:** `bytes_dword(+atom,+integer,+integer,+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `character_set_protocol` Character set protocol for converting between lists of character codes and lists of bytes. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Object names: Concrete object names are derived from the preferred IANA MIME names by lowercasing them and replacing hyphens with underscores. > > - IANA registry metadata: The metadata predicates reflect the IANA character set registry. When the registry does not define a distinct preferred MIME alias, the `preferred_mime_name/1` and `name/1` predicates return the same atom. > > - Unicode encodings: Unicode character sets use Unicode scalar values and do not emit or consume a byte order mark (BOM). **Inherited public predicates:** (none) - Public predicates - `preferred_mime_name/1` - `name/1` - `alias/1` - `mibenum/1` - `codes_to_bytes/2` - `bytes_to_codes/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `preferred_mime_name/1` Preferred MIME name for the character set according to the IANA registry. **Compilation flags:** `static` **Template:** `preferred_mime_name(Name)` **Mode and number of proofs:** `preferred_mime_name(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `name/1` Registered character set name according to the IANA registry. **Compilation flags:** `static` **Template:** `name(Name)` **Mode and number of proofs:** `name(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `alias/1` Alias for the character set according to the IANA registry. **Compilation flags:** `static` **Template:** `alias(Alias)` **Mode and number of proofs:** `alias(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `mibenum/1` MIBenum value for the character set according to the IANA registry. **Compilation flags:** `static` **Template:** `mibenum(MIBenum)` **Mode and number of proofs:** `mibenum(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `codes_to_bytes/2` Converts a list of character codes to the corresponding list of bytes in the character set when all codes are representable. **Compilation flags:** `static` **Template:** `codes_to_bytes(Codes,Bytes)` **Mode and number of proofs:** `codes_to_bytes(+list(integer),--list(byte))` - `zero_or_one` ------------------------------------------------------------------------ ###### `bytes_to_codes/2` Converts a list of bytes in the character set to the corresponding list of character codes when the byte sequence is valid for that character set. **Compilation flags:** `static` **Template:** `bytes_to_codes(Bytes,Codes)` **Mode and number of proofs:** `bytes_to_codes(+list(byte),--list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `iso_8859_1` ISO-8859-1 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` single_byte_character_set(255) **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_10` ISO-8859-10 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_13` ISO-8859-13 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_14` ISO-8859-14 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_15` ISO-8859-15 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_16` ISO-8859-16 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_2` ISO-8859-2 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_3` ISO-8859-3 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_4` ISO-8859-4 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_8859_9` ISO-8859-9 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `mapped_single_byte_character_set` Single-byte character set implementation parameterized by sparse byte-to-code mapping facts and undefined bytes. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static` **Extends:** `public` character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - `mapping/2` - `undefined/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `mapping/2` Returns, by backtracking, declared byte-to-code mappings. **Compilation flags:** `static` **Template:** `mapping(Byte,Code)` **Mode and number of proofs:** `mapping(?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `undefined/2` Returns, by backtracking, declared undefined byte values. **Compilation flags:** `static` **Template:** `undefined(Byte,Code)` **Mode and number of proofs:** `undefined(?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `single_byte_character_set(MaxCode)` Single-byte character set implementation parameterized by the maximum valid code. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static` **Extends:** `public` character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `us_ascii` US-ASCII character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` single_byte_character_set(127) **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `utf_16_character_set(Endian)` UTF-16 character set implementation parameterized by byte order. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static` **Extends:** `public` character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `utf_16be` UTF-16 big-endian character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` utf_16_character_set(big_endian) **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `utf_16le` UTF-16 little-endian character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` utf_16_character_set(little_endian) **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `utf_32_character_set(Endian)` UTF-32 character set implementation parameterized by byte order. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static` **Extends:** `public` character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `utf_32be` UTF-32 big-endian character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` utf_32_character_set(big_endian) **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `utf_32le` UTF-32 little-endian character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` utf_32_character_set(little_endian) **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `utf_8` UTF-8 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` character_set **Extends:** `public` utf_8_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `utf_8_character_set` UTF-8 character set implementation. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `windows_1250` Windows-1250 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `windows_1251` Windows-1251 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `windows_1252` Windows-1252 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `windows_1253` Windows-1253 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `windows_1254` Windows-1254 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `windows_1257` Windows-1257 character set encoder and decoder. **Availability:** `logtalk_load(character_sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` mapped_single_byte_character_set **Remarks:** (none) **Inherited public predicates:**  alias/1  bytes_to_codes/2  codes_to_bytes/2  mibenum/1  name/1  preferred_mime_name/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### classification_protocols") **category** #### `classifier_common` Shared predicates for classifier diagnostics, dataset validation, mixed-feature distance calculations, and export. **Availability:** `logtalk_load(classification_protocols(loader))` **Author:** Paulo Moura **Version:** 2:0:1 **Date:** 2026-06-14 **Compilation flags:** `static` **Implements:** `public` classifier_protocol **Extends:** `public` options **Uses:** format list population type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `classifier_diagnostics_data/2` - `classifier_export_template/4` - `classifier_term_template/2` - `print_classifier_template/1` - `valid_attribute_names/1` - `valid_class_values/1` - `valid_feature_types/2` - `valid_discrete_values/1` - `valid_linear_encoders/1` - `dataset_attributes/2` - `dataset_examples/2` - `check_examples_non_empty/2` - `check_examples/2` - `check_complete_examples/2` - `check_complete_examples_nonvar/2` - `build_linear_encoders/4` - `examples_to_linear_rows/3` - `encode_linear_instance/3` - `linear_encoders_feature_count/2` - `valid_classifier_metadata/2` - `valid_classifier_metadata/3` - `mixed_feature_distance/5` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `classifier_diagnostics_data/2` Hook predicate that importing classifier implementations must define in order to expose diagnostics metadata. **Compilation flags:** `static` **Template:** `classifier_diagnostics_data(Classifier,Diagnostics)` **Mode and number of proofs:** `classifier_diagnostics_data(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `classifier_export_template/4` Hook predicate that importing classifier implementations must define in order to expose the exported classifier template for a given functor. **Compilation flags:** `static` **Template:** `classifier_export_template(Dataset,Classifier,Functor,Template)` **Mode and number of proofs:** `classifier_export_template(+object_identifier,+compound,+atom,-callable)` - `one` ------------------------------------------------------------------------ ###### `classifier_term_template/2` Hook predicate that importing classifier implementations must define in order to expose the learned classifier term template used by pretty-printing helpers. **Compilation flags:** `static` **Template:** `classifier_term_template(Classifier,Template)` **Mode and number of proofs:** `classifier_term_template(+compound,-callable)` - `one` ------------------------------------------------------------------------ ###### `print_classifier_template/1` Pretty-printing helper predicate used by importing classifier implementations to show the learned classifier term template. **Compilation flags:** `static` **Template:** `print_classifier_template(Classifier)` **Mode and number of proofs:** `print_classifier_template(+compound)` - `one` ------------------------------------------------------------------------ ###### `valid_attribute_names/1` True when a list of attribute names is a proper list of distinct atoms. **Compilation flags:** `static` **Template:** `valid_attribute_names(AttributeNames)` **Mode and number of proofs:** `valid_attribute_names(+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_class_values/1` True when a list of class values is a non-empty proper list of distinct atoms. **Compilation flags:** `static` **Template:** `valid_class_values(ClassValues)` **Mode and number of proofs:** `valid_class_values(+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_feature_types/2` True when a list of feature type tags is non-empty and each tag belongs to the given allowed set. **Compilation flags:** `static` **Template:** `valid_feature_types(FeatureTypes,AllowedTypes)` **Mode and number of proofs:** `valid_feature_types(+list,+list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_discrete_values/1` True when a list of categorical values is non-empty, contains only nonvar terms, and has no duplicates. **Compilation flags:** `static` **Template:** `valid_discrete_values(Values)` **Mode and number of proofs:** `valid_discrete_values(+list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_linear_encoders/1` True when a list of encoders only contains valid `continuous/3` or `categorical/2` encoder terms with distinct attributes. **Compilation flags:** `static` **Template:** `valid_linear_encoders(Encoders)` **Mode and number of proofs:** `valid_linear_encoders(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `dataset_attributes/2` Collects the declared dataset attributes and their value domains. **Compilation flags:** `static` **Template:** `dataset_attributes(Dataset,Attributes)` **Mode and number of proofs:** `dataset_attributes(+object_identifier,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `dataset_examples/2` Collects the dataset training examples as `Id-Class-AttributeValues` terms. **Compilation flags:** `static` **Template:** `dataset_examples(Dataset,Examples)` **Mode and number of proofs:** `dataset_examples(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `check_examples_non_empty/2` Checks that a training example collection is not empty. **Compilation flags:** `static` **Template:** `check_examples_non_empty(Dataset,Examples)` **Mode and number of proofs:** `check_examples_non_empty(+object_identifier,+list)` - `one` ------------------------------------------------------------------------ ###### `check_examples/2` Checks that a training dataset is non-empty, that all example classes belong to the declared class values, and that provided attribute bindings use declared attributes with values matching the declared domains. Missing attribute bindings are allowed. **Compilation flags:** `static` **Template:** `check_examples(Dataset,Examples)` **Mode and number of proofs:** `check_examples(+object_identifier,+list)` - `one_or_error` **Exceptions:** `Examples` is empty: `domain_error(non_empty_dataset,Dataset)` `Dataset` class values declaration is invalid: `domain_error(class_values,ClassValues)` An example class is not one of the declared class values: `domain_error(dataset_example_class,Class)` An example attribute binding uses an undeclared attribute or a value outside the declared attribute domain: `domain_error(dataset_example_attribute_values,AttributeValues)` ------------------------------------------------------------------------ ###### `check_complete_examples/2` Checks that a training dataset is non-empty, that all example classes belong to the declared class values, and that each example contains every declared attribute exactly once with values matching the declared domains. Missing values represented using variables are allowed. **Compilation flags:** `static` **Template:** `check_complete_examples(Dataset,Examples)` **Mode and number of proofs:** `check_complete_examples(+object_identifier,+list)` - `one_or_error` **Exceptions:** `Examples` is empty: `domain_error(non_empty_dataset,Dataset)` `Dataset` class values declaration is invalid: `domain_error(class_values,ClassValues)` An example class is not one of the declared class values: `domain_error(dataset_example_class,Class)` An example attribute set is missing a declared attribute, contains a duplicate attribute, uses an undeclared attribute, or contains a non-variable value outside the declared attribute domain: `domain_error(dataset_example_attribute_values,AttributeValues)` ------------------------------------------------------------------------ ###### `check_complete_examples_nonvar/2` Checks that a training dataset is non-empty, that all example classes belong to the declared class values, and that each example contains every declared attribute exactly once with non-variable values matching the declared domains. **Compilation flags:** `static` **Template:** `check_complete_examples_nonvar(Dataset,Examples)` **Mode and number of proofs:** `check_complete_examples_nonvar(+object_identifier,+list)` - `one_or_error` **Exceptions:** `Examples` is empty: `domain_error(non_empty_dataset,Dataset)` `Dataset` class values declaration is invalid: `domain_error(class_values,ClassValues)` An example class is not one of the declared class values: `domain_error(dataset_example_class,Class)` An example attribute set is missing a declared attribute, contains a duplicate attribute, uses an undeclared attribute, contains a variable value, or contains a value outside the declared attribute domain: `domain_error(dataset_example_attribute_values,AttributeValues)` ------------------------------------------------------------------------ ###### `build_linear_encoders/4` Builds linear-model encoders for continuous and categorical attributes. Continuous encoders optionally standardize features when `FeatureScaling` is true. **Compilation flags:** `static` **Template:** `build_linear_encoders(Attributes,Examples,FeatureScaling,Encoders)` **Mode and number of proofs:** `build_linear_encoders(+list(pair),+list(compound),+boolean,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `examples_to_linear_rows/3` Encodes examples into `Features-Class` rows using the given linear encoders. **Compilation flags:** `static` **Template:** `examples_to_linear_rows(Examples,Encoders,Rows)` **Mode and number of proofs:** `examples_to_linear_rows(+list(compound),+list(compound),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `encode_linear_instance/3` Encodes an instance into a numeric feature vector using the given linear encoders. **Compilation flags:** `static` **Template:** `encode_linear_instance(Encoders,Instance,Features)` **Mode and number of proofs:** `encode_linear_instance(+list(compound),+list(pair),-list(float))` - `one` ------------------------------------------------------------------------ ###### `linear_encoders_feature_count/2` Computes the number of numeric features produced by a set of linear encoders. **Compilation flags:** `static` **Template:** `linear_encoders_feature_count(Encoders,Count)` **Mode and number of proofs:** `linear_encoders_feature_count(+list(compound),-integer)` - `one` ------------------------------------------------------------------------ ###### `valid_classifier_metadata/2` True when diagnostics metadata contains the expected model term. **Compilation flags:** `static` **Template:** `valid_classifier_metadata(Model,Diagnostics)` **Mode and number of proofs:** `valid_classifier_metadata(+atom,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_classifier_metadata/3` True when diagnostics metadata contains the expected model term and records the given effective options. **Compilation flags:** `static` **Template:** `valid_classifier_metadata(Model,Options,Diagnostics)` **Mode and number of proofs:** `valid_classifier_metadata(+atom,+list(compound),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `mixed_feature_distance/5` Computes a distance between two mixed-feature vectors using the given feature types and one of the supported metrics `euclidean`, `manhattan`, `chebyshev`, `cosine`, or `minkowski(Order)`. **Compilation flags:** `static` **Template:** `mixed_feature_distance(Metric,FeatureTypes,Values1,Values2,Distance)` **Mode and number of proofs:** `mixed_feature_distance(+term,+list,+list,+list,-float)` - `one_or_error` **Exceptions:** `Metric` is `minkowski(Order)` and `Order` is not a positive number: `domain_error(positive_number,Order)` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `classifier_protocol` Protocol for machine learning classifiers. **Availability:** `logtalk_load(classification_protocols(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-07 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `learn/3` - `learn/2` - `predict/3` - `check_classifier/1` - `valid_classifier/1` - `diagnostics/2` - `diagnostic/2` - `classifier_options/2` - `export_to_clauses/4` - `export_to_file/4` - `print_classifier/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `learn/3` Learns a classifier from the given dataset object using the specified options. **Compilation flags:** `static` **Template:** `learn(Dataset,Classifier,Options)` **Mode and number of proofs:** `learn(+object_identifier,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `learn/2` Learns a classifier from the given dataset object using default options. **Compilation flags:** `static` **Template:** `learn(Dataset,Classifier)` **Mode and number of proofs:** `learn(+object_identifier,-compound)` - `one` ------------------------------------------------------------------------ ###### `predict/3` Predicts the class label for a new instance using the learned classifier. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict(Classifier,Instance,Class)` **Mode and number of proofs:** `predict(+compound,+list,-atom)` - `one` ------------------------------------------------------------------------ ###### `check_classifier/1` Checks that a learned classifier term is structurally valid for the receiving implementation. Throws an exception when the term is not a valid classifier representation. **Compilation flags:** `static` **Template:** `check_classifier(Classifier)` **Mode and number of proofs:** `check_classifier(@compound)` - `one_or_error` **Exceptions:** `Classifier` is a variable: `instantiation_error` `Classifier` is neither a variable nor a valid classifier: `domain_error(classifier,Classifier)` ------------------------------------------------------------------------ ###### `valid_classifier/1` True when a learned classifier term is structurally valid for the receiving implementation. Succeeds iff `check_classifier/1` succeeds without throwing an exception. **Compilation flags:** `static` **Template:** `valid_classifier(Classifier)` **Mode and number of proofs:** `valid_classifier(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `diagnostics/2` Returns diagnostics and metadata associated with a learned classifier in a representation-independent way. **Compilation flags:** `static` **Template:** `diagnostics(Classifier,Diagnostics)` **Mode and number of proofs:** `diagnostics(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostic/2` Tests or enumerates individual diagnostics metadata terms for a learned classifier. **Compilation flags:** `static` **Template:** `diagnostic(Classifier,Diagnostic)` **Mode and number of proofs:** `diagnostic(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `classifier_options/2` Returns the effective training options recorded in a learned classifier diagnostics list. **Compilation flags:** `static` **Template:** `classifier_options(Classifier,Options)` **Mode and number of proofs:** `classifier_options(+compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `export_to_clauses/4` Converts a classifier into a list of predicate clauses. `Functor` is the functor for the generated predicate clauses. When exporting a serialized classifier term, a noun such as `classifier` or `model` is usually clearer than a verb such as `classify`. **Compilation flags:** `static` **Template:** `export_to_clauses(Dataset,Classifier,Functor,Clauses)` **Mode and number of proofs:** `export_to_clauses(+object_identifier,+compound,+callable,-list(clause))` - `one` ------------------------------------------------------------------------ ###### `export_to_file/4` Exports a classifier to a file. `Functor` is the functor for the generated predicate clauses. When exporting a serialized classifier term, a noun such as `classifier` or `model` is usually clearer than a verb such as `classify`. **Compilation flags:** `static` **Template:** `export_to_file(Dataset,Classifier,Functor,File)` **Mode and number of proofs:** `export_to_file(+object_identifier,+compound,+callable,+atom)` - `one` ------------------------------------------------------------------------ ###### `print_classifier/1` Prints a classifier to the current output stream in a human-readable format. **Compilation flags:** `static` **Template:** `print_classifier(Classifier)` **Mode and number of proofs:** `print_classifier(+compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also adaptive_boosting_classifier, c45_classifier, gradient_boosting_classifier, isolation_forest_anomaly_detector, kernel_svm_classifier, knn_classifier, lda_classifier, linear_svm_classifier, logistic_regression_classifier, naive_bayes_classifier, nearest_centroid_classifier, qda_classifier, random_forest_classifier, sgd_classifier **protocol** #### `dataset_protocol` Protocol for datasets used with classifier algorithms. **Availability:** `logtalk_load(classification_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-19 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `attribute_values/2` - `class/1` - `class_values/1` - `example/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `attribute_values/2` Enumerates by backtracking the attributes and their possible values. For discrete attributes, `Values` is a list of possible values. For continuous (numeric) attributes, `Values` is the atom `continuous`. **Compilation flags:** `static` **Template:** `attribute_values(Attribute,Values)` **Mode and number of proofs:** `attribute_values(?atom,-list(atom))` - `zero_or_more` `attribute_values(?atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `class/1` Returns the name of the target class attribute. **Compilation flags:** `static` **Template:** `class(Class)` **Mode and number of proofs:** `class(-atom)` - `one` ------------------------------------------------------------------------ ###### `class_values/1` Returns the list of possible values for the target class attribute. **Compilation flags:** `static` **Template:** `class_values(Values)` **Mode and number of proofs:** `class_values(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `example/3` Enumerates by backtracking the examples in the dataset. Each example has an `Id`, a `Class` value, and a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `example(Id,Class,AttributeValues)` **Mode and number of proofs:** `example(-integer,-atom,-list(pair))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `probabilistic_classifier_common` Shared predicates for probabilistic classifiers. **Availability:** `logtalk_load(classification_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-11 **Compilation flags:** `static` **Implements:** `public` probabilistic_classifier_protocol **Extends:** `public` classifier_common **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `predict_from_probabilities/3` - `max_probability/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `predict_from_probabilities/3` Predicts the class label for a new instance by selecting the maximum-probability class returned by `predict_probabilities/3`. **Compilation flags:** `static` **Template:** `predict_from_probabilities(Classifier,Instance,Class)` **Mode and number of proofs:** `predict_from_probabilities(+compound,+list,-atom)` - `one` ------------------------------------------------------------------------ ###### `max_probability/3` Selects the class-probability pair with maximum probability from a non-empty list of `Class-Probability` pairs. **Compilation flags:** `static` **Template:** `max_probability(Probabilities,Class,Probability)` **Mode and number of proofs:** `max_probability(+list(pair),-atom,-float)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `probabilistic_classifier_protocol` Protocol for classifiers that can estimate class probabilities. **Availability:** `logtalk_load(classification_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-11 **Compilation flags:** `static` **Extends:** `public` classifier_protocol **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  classifier_options/2  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  predict/3  print_classifier/1  valid_classifier/1 - Public predicates - `predict_probabilities/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `predict_probabilities/3` Predicts class probabilities for a new instance using the learned classifier. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict_probabilities(Classifier,Instance,Probabilities)` **Mode and number of proofs:** `predict_probabilities(+compound,+list,-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also classifier_protocol, adaptive_boosting_classifier, gradient_boosting_classifier, kernel_svm_classifier, knn_classifier, logistic_regression_classifier, naive_bayes_classifier, nearest_centroid_classifier, random_forest_classifier, sgd_classifier ### clo_span_pattern_miner") **object** #### `clo_span_pattern_miner` Closed sequential pattern miner for sequence datasets using closure-aware projected-database search. **Availability:** `logtalk_load(clo_span_pattern_miner(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` sequential_pattern_mining_common **Uses:** format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pattern_miner_protocol, sequence_dataset_protocol, prefix_span_pattern_miner, gsp_pattern_miner, spade_pattern_miner ### clustering_protocols") **category** #### `clusterer_common` Shared predicates for clusterer learning defaults, export, and common dataset and encoding helpers. **Availability:** `logtalk_load(clustering_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-30 **Compilation flags:** `static` **Implements:** `public` clusterer_protocol **Extends:** `public` options **Uses:** format list population type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `dataset_attributes/2` - `valid_attribute_names/1` - `valid_continuous_encoders/1` - `valid_discrete_encoders/1` - `valid_mixed_encoders/1` - `valid_mixed_vectors/2` - `valid_clusterer_metadata/3` - `valid_diagnostic_count/3` - `valid_diagnostic_choice/3` - `check_continuous_attributes/1` - `check_examples_non_empty/2` - `check_examples/3` - `check_example_values/2` - `check_example_attributes/2` - `check_attribute_bindings/2` - `attribute_value/3` - `build_encoders/4` - `known_attribute_values/3` - `examples_to_rows/3` - `encode_instance/3` - `check_encoded_attribute_bindings/2` - `normalize_continuous/4` - `check_cluster_count/2` - `take_first_k/3` - `remove_candidate/3` - `clusterer_diagnostics_data/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `dataset_attributes/2` Collects the dataset attribute declarations as Attribute-Values pairs. **Compilation flags:** `static` **Template:** `dataset_attributes(Dataset,Attributes)` **Mode and number of proofs:** `dataset_attributes(+object_identifier,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `valid_attribute_names/1` True when a list of attribute names is a proper list of distinct atoms. **Compilation flags:** `static` **Template:** `valid_attribute_names(AttributeNames)` **Mode and number of proofs:** `valid_attribute_names(+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_continuous_encoders/1` True when a list of encoders only contains valid continuous encoder terms with distinct attributes. **Compilation flags:** `static` **Template:** `valid_continuous_encoders(Encoders)` **Mode and number of proofs:** `valid_continuous_encoders(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_discrete_encoders/1` True when a list of encoders only contains valid discrete encoder terms with distinct attributes. **Compilation flags:** `static` **Template:** `valid_discrete_encoders(Encoders)` **Mode and number of proofs:** `valid_discrete_encoders(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_mixed_encoders/1` True when a list of encoders only contains valid continuous or discrete encoder terms with distinct attributes. **Compilation flags:** `static` **Template:** `valid_mixed_encoders(Encoders)` **Mode and number of proofs:** `valid_mixed_encoders(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_mixed_vectors/2` True when all vectors conform to the given continuous or discrete encoder specifications. **Compilation flags:** `static` **Template:** `valid_mixed_vectors(Encoders,Vectors)` **Mode and number of proofs:** `valid_mixed_vectors(+list(compound),+list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_clusterer_metadata/3` True when diagnostics metadata contains the expected model term and records the given effective options. **Compilation flags:** `static` **Template:** `valid_clusterer_metadata(Model,Options,Diagnostics)` **Mode and number of proofs:** `valid_clusterer_metadata(+atom,+list(compound),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_diagnostic_count/3` True when diagnostics contains a count term with the given functor and integer value. **Compilation flags:** `static` **Template:** `valid_diagnostic_count(Functor,Diagnostics,Count)` **Mode and number of proofs:** `valid_diagnostic_count(+atom,+list(compound),+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_diagnostic_choice/3` True when diagnostics contains a term with the given functor and a value selected from the allowed choices. **Compilation flags:** `static` **Template:** `valid_diagnostic_choice(Functor,Diagnostics,Choices)` **Mode and number of proofs:** `valid_diagnostic_choice(+atom,+list(compound),+list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `check_continuous_attributes/1` Checks that all declared dataset attributes are continuous. **Compilation flags:** `static` **Template:** `check_continuous_attributes(Attributes)` **Mode and number of proofs:** `check_continuous_attributes(+list(pair))` - `one` ------------------------------------------------------------------------ ###### `check_examples_non_empty/2` Checks that a training example collection is not empty. **Compilation flags:** `static` **Template:** `check_examples_non_empty(Dataset,Examples)` **Mode and number of proofs:** `check_examples_non_empty(+object_identifier,+list)` - `one` ------------------------------------------------------------------------ ###### `check_examples/3` Checks that a continuous training dataset is non-empty and that all example values are numeric. **Compilation flags:** `static` **Template:** `check_examples(Dataset,AttributeNames,Examples)` **Mode and number of proofs:** `check_examples(+object_identifier,+list(atom),+list)` - `one` ------------------------------------------------------------------------ ###### `check_example_values/2` Checks that all example attribute values are present and numeric for the declared attributes. **Compilation flags:** `static` **Template:** `check_example_values(Examples,AttributeNames)` **Mode and number of proofs:** `check_example_values(+list,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `check_example_attributes/2` Checks that a single example contains exactly the declared attributes and that all values are numeric. **Compilation flags:** `static` **Template:** `check_example_attributes(AttributeNames,AttributeValues)` **Mode and number of proofs:** `check_example_attributes(+list(atom),+list(pair))` - `one` ------------------------------------------------------------------------ ###### `check_attribute_bindings/2` Checks that an attribute-value list contains each declared attribute exactly once and no undeclared attributes. **Compilation flags:** `static` **Template:** `check_attribute_bindings(AttributeNames,AttributeValues)` **Mode and number of proofs:** `check_attribute_bindings(+list(atom),+list(pair))` - `one` ------------------------------------------------------------------------ ###### `attribute_value/3` Looks up an attribute value in a list of Attribute-Value pairs. **Compilation flags:** `static` **Template:** `attribute_value(Attribute,AttributeValues,Value)` **Mode and number of proofs:** `attribute_value(+atom,+list(pair),-term)` - `one` ------------------------------------------------------------------------ ###### `build_encoders/4` Builds continuous feature encoders by computing per-attribute centering and optional scaling statistics. **Compilation flags:** `static` **Template:** `build_encoders(AttributeNames,Examples,Options,Encoders)` **Mode and number of proofs:** `build_encoders(+list(atom),+list,+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `known_attribute_values/3` Collects the known numeric values for a given attribute across the training examples. **Compilation flags:** `static` **Template:** `known_attribute_values(Examples,Attribute,Values)` **Mode and number of proofs:** `known_attribute_values(+list,+atom,-list(number))` - `one` ------------------------------------------------------------------------ ###### `examples_to_rows/3` Encodes training examples into Id-Features rows using the object-local or imported encoder implementation. **Compilation flags:** `static` **Template:** `examples_to_rows(Examples,Encoders,Rows)` **Mode and number of proofs:** `examples_to_rows(+list,+list(compound),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `encode_instance/3` Encodes an instance using the learned continuous attribute encoders after checking that it contains exactly the declared attributes. **Compilation flags:** `static` **Template:** `encode_instance(Encoders,AttributeValues,Features)` **Mode and number of proofs:** `encode_instance(+list(compound),+list(pair),-list(number))` - `one` ------------------------------------------------------------------------ ###### `check_encoded_attribute_bindings/2` Checks that an attribute-value list contains each attribute described by the encoders exactly once and no undeclared attributes. **Compilation flags:** `static` **Template:** `check_encoded_attribute_bindings(Encoders,AttributeValues)` **Mode and number of proofs:** `check_encoded_attribute_bindings(+list(compound),+list(pair))` - `one` ------------------------------------------------------------------------ ###### `normalize_continuous/4` Normalizes a continuous value using the learned centering and scaling parameters. **Compilation flags:** `static` **Template:** `normalize_continuous(Value,Mean,Scale,Feature)` **Mode and number of proofs:** `normalize_continuous(+number,+number,+number,-number)` - `one` ------------------------------------------------------------------------ ###### `check_cluster_count/2` Checks that the requested cluster count does not exceed the number of examples. **Compilation flags:** `static` **Template:** `check_cluster_count(K,Count)` **Mode and number of proofs:** `check_cluster_count(+integer,+integer)` - `one` ------------------------------------------------------------------------ ###### `take_first_k/3` Collects the first K vectors from Id-Vector rows. **Compilation flags:** `static` **Template:** `take_first_k(K,Rows,Vectors)` **Mode and number of proofs:** `take_first_k(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `remove_candidate/3` Removes the first matching Id-Vector candidate from a candidate list. **Compilation flags:** `static` **Template:** `remove_candidate(Candidate,Candidates,RemainingCandidates)` **Mode and number of proofs:** `remove_candidate(+pair,+list(pair),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `clusterer_diagnostics_data/2` Hook predicate that importing clusterer implementations must define in order to expose diagnostics metadata. **Compilation flags:** `static` **Template:** `clusterer_diagnostics_data(Clusterer,Diagnostics)` **Mode and number of proofs:** `clusterer_diagnostics_data(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `clusterer_protocol` Protocol for machine learning clusterers. **Availability:** `logtalk_load(clustering_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-30 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `learn/3` - `learn/2` - `cluster/3` - `diagnostics/2` - `check_clusterer/1` - `valid_clusterer/1` - `diagnostic/2` - `clusterer_options/2` - `export_to_clauses/4` - `export_to_file/4` - `print_clusterer/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `learn/3` Learns a clusterer from the given dataset object using the specified options. **Compilation flags:** `static` **Template:** `learn(Dataset,Clusterer,Options)` **Mode and number of proofs:** `learn(+object_identifier,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `learn/2` Learns a clusterer from the given dataset object using default options. **Compilation flags:** `static` **Template:** `learn(Dataset,Clusterer)` **Mode and number of proofs:** `learn(+object_identifier,-compound)` - `one` ------------------------------------------------------------------------ ###### `cluster/3` Assigns a new instance to a cluster using the learned clusterer. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `cluster(Clusterer,Instance,Cluster)` **Mode and number of proofs:** `cluster(+compound,+list,-ground)` - `one` ------------------------------------------------------------------------ ###### `diagnostics/2` Returns diagnostics and metadata associated with a learned clusterer in a representation-independent way. **Compilation flags:** `static` **Template:** `diagnostics(Clusterer,Diagnostics)` **Mode and number of proofs:** `diagnostics(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `check_clusterer/1` Checks that a learned clusterer term is structurally valid for the receiving implementation. Throws an exception when the term is not a valid clusterer representation. **Compilation flags:** `static` **Template:** `check_clusterer(Clusterer)` **Mode and number of proofs:** `check_clusterer(@compound)` - `one_or_error` **Exceptions:** `Clusterer` is a variable: `instantiation_error` `Clusterer` is neither a variable nor a valid clusterer: `domain_error(clusterer,Clusterer)` ------------------------------------------------------------------------ ###### `valid_clusterer/1` True when a learned clusterer term is structurally valid for the receiving implementation. Succeeds iff check_clusterer/1 succeeds without throwing an exception. **Compilation flags:** `static` **Template:** `valid_clusterer(Clusterer)` **Mode and number of proofs:** `valid_clusterer(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `diagnostic/2` Tests or enumerates individual diagnostics metadata terms for a learned clusterer. **Compilation flags:** `static` **Template:** `diagnostic(Clusterer,Diagnostic)` **Mode and number of proofs:** `diagnostic(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `clusterer_options/2` Returns the effective training options recorded in a learned clusterer diagnostics list. **Compilation flags:** `static` **Template:** `clusterer_options(Clusterer,Options)` **Mode and number of proofs:** `clusterer_options(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `export_to_clauses/4` Converts a clusterer into a list of predicate clauses. `Functor` is the functor for the generated predicate clauses. **Compilation flags:** `static` **Template:** `export_to_clauses(Dataset,Clusterer,Functor,Clauses)` **Mode and number of proofs:** `export_to_clauses(+object_identifier,+compound,+callable,-list(clause))` - `one` ------------------------------------------------------------------------ ###### `export_to_file/4` Exports a clusterer to a file. `Functor` is the functor for the generated `Functor(Clusterer)` predicate clause. **Compilation flags:** `static` **Template:** `export_to_file(Dataset,Clusterer,Functor,File)` **Mode and number of proofs:** `export_to_file(+object_identifier,+compound,+callable,+atom)` - `one` ------------------------------------------------------------------------ ###### `print_clusterer/1` Prints a clusterer to the current output stream in a human-readable format. **Compilation flags:** `static` **Template:** `print_clusterer(Clusterer)` **Mode and number of proofs:** `print_clusterer(+compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also clustering_dataset_protocol **protocol** #### `clustering_dataset_protocol` Protocol for datasets used with clustering algorithms. **Availability:** `logtalk_load(clustering_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-23 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `attribute_values/2` - `example/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `attribute_values/2` Enumerates by backtracking the attributes and their possible values. For discrete attributes, `Values` is a list of possible values. For continuous (numeric) attributes, `Values` is the atom `continuous`. **Compilation flags:** `static` **Template:** `attribute_values(Attribute,Values)` **Mode and number of proofs:** `attribute_values(?atom,-list(atom))` - `zero_or_more` `attribute_values(?atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `example/2` Enumerates by backtracking the examples in the dataset. Each example has an `Id` and a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `example(Id,AttributeValues)` **Mode and number of proofs:** `example(-integer,-list(pair))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `search_indexing` Shared helpers for adaptive search-index construction and range queries used by clustering libraries. **Availability:** `logtalk_load(clustering_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-23 **Compilation flags:** `static` **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `build_auto_search_index/3` - `build_metric_tree/3` - `build_grid_index/3` - `range_query/5` - `search_index_cell_size/2` - `select_metric_pivot/4` - `distance/4` - `split_sorted_rows/5` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `build_auto_search_index/3` Builds an adaptive search index by selecting either a grid index or a metric tree based on dataset shape. **Compilation flags:** `static` **Template:** `build_auto_search_index(Rows,Options,SearchIndex)` **Mode and number of proofs:** `build_auto_search_index(+list(pair),+list(compound),-compound)` - `one` ------------------------------------------------------------------------ ###### `build_metric_tree/3` Builds a metric tree search index for encoded dataset rows. **Compilation flags:** `static` **Template:** `build_metric_tree(Rows,Options,MetricTree)` **Mode and number of proofs:** `build_metric_tree(+list(pair),+list(compound),-compound)` - `one` ------------------------------------------------------------------------ ###### `build_grid_index/3` Builds a grid-based search index for encoded dataset rows using the object-defined cell size. **Compilation flags:** `static` **Template:** `build_grid_index(Rows,Options,GridIndex)` **Mode and number of proofs:** `build_grid_index(+list(pair),+list(compound),-compound)` - `one` ------------------------------------------------------------------------ ###### `range_query/5` Queries a search index for rows within the given epsilon distance of an encoded feature vector. **Compilation flags:** `static` **Template:** `range_query(SearchIndex,Vector,Options,Epsilon,Neighbors)` **Mode and number of proofs:** `range_query(+compound,+list(number),+list(compound),+number,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `search_index_cell_size/2` Returns the grid cell size to use when constructing a grid-based search index. **Compilation flags:** `static` **Template:** `search_index_cell_size(Options,CellSize)` **Mode and number of proofs:** `search_index_cell_size(+list(compound),-number)` - `one` ------------------------------------------------------------------------ ###### `select_metric_pivot/4` Selects a pivot row and returns the remaining rows decorated and sorted by distance to that pivot. **Compilation flags:** `static` **Template:** `select_metric_pivot(Rows,Options,Pivot,SortedRows)` **Mode and number of proofs:** `select_metric_pivot(+list(pair),+list(compound),-pair,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `distance/4` Computes the distance between two encoded feature vectors using the effective object options. **Compilation flags:** `static` **Template:** `distance(Options,Vector1,Vector2,Distance)` **Mode and number of proofs:** `distance(+list(compound),+list(number),+list(number),-number)` - `one` ------------------------------------------------------------------------ ###### `split_sorted_rows/5` Splits rows decorated with distances into inner and outer partitions and returns their boundary distances. **Compilation flags:** `static` **Template:** `split_sorted_rows(SortedRows,InnerUpperBound,OuterLowerBound,InnerRows,OuterRows)` **Mode and number of proofs:** `split_sorted_rows(+list(pair),-number,-number,-list(pair),-list(pair))` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### code_metrics") **object** #### `cc_metric` Cyclomatic complexity metric. All defined predicates that are not called or updated are counted as graph connected components (the reasoning being that these predicates can be considered entry points). The score is represented by a non-negative integer. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 0:5:3 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk numberlist **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `code_metric` Core predicates for computing source code metrics. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Ebrahim Azarisooreh and Paulo Moura **Version:** 0:13:0 **Date:** 2025-10-06 **Compilation flags:** `static` **Extends:** `public` code_metrics_utilities `public` options **Uses:** list logtalk os type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `entity/1` - `file/2` - `file/1` - `directory/2` - `directory/1` - `rdirectory/2` - `rdirectory/1` - `library/2` - `library/1` - `rlibrary/2` - `rlibrary/1` - `all/1` - `all/0` - `entity_score/2` - `library_score/2` - `rlibrary_score/2` - `file_score/2` - `directory_score/2` - `rdirectory_score/2` - `all_score/1` - `format_entity_score//2` - Protected predicates - `process_entity/2` - `process_file/2` - `process_directory/2` - `process_rdirectory/2` - `process_library/2` - `process_rlibrary/2` - `process_all/1` - `sub_directory/2` - `sub_library/2` - Private predicates - Operators ##### Public predicates ###### `entity/1` Scans an entity and prints its metric score. **Compilation flags:** `static` **Template:** `entity(Entity)` **Mode and number of proofs:** `entity(+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `file/2` Prints metric scores for all the entities defined in a loaded source file using the given options. **Compilation flags:** `static` **Template:** `file(File,Options)` **Mode and number of proofs:** `file(+atom,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `file/1` Prints metric scores for all the entities defined in a loaded source file using default options. **Compilation flags:** `static` **Template:** `file(File)` **Mode and number of proofs:** `file(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `directory/2` Scans a directory and prints metric scores for all entities defined in its loaded source files using the given options. **Compilation flags:** `static` **Template:** `directory(Directory,Options)` **Mode and number of proofs:** `directory(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `directory/1` Scans a directory and prints metric scores for all entities defined in its loaded source files using default options. **Compilation flags:** `static` **Template:** `directory(Directory)` **Mode and number of proofs:** `directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `rdirectory/2` Recursive version of the `directory/1` predicate using the given options. **Compilation flags:** `static` **Template:** `rdirectory(Directory,Options)` **Mode and number of proofs:** `rdirectory(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rdirectory/1` Recursive version of the `directory/1` predicate using default options. **Compilation flags:** `static` **Template:** `rdirectory(Directory)` **Mode and number of proofs:** `rdirectory(+atom)` - `one` ------------------------------------------------------------------------ ###### `library/2` Prints metrics scores for all loaded entities from a given library using the given options. **Compilation flags:** `static` **Template:** `library(Library,Options)` **Mode and number of proofs:** `library(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `library/1` Prints metrics scores for all loaded entities from a given library using default options. **Compilation flags:** `static` **Template:** `library(Library)` **Mode and number of proofs:** `library(+atom)` - `one` ------------------------------------------------------------------------ ###### `rlibrary/2` Recursive version of the `library/1` predicate using the given options. **Compilation flags:** `static` **Template:** `rlibrary(Library,Options)` **Mode and number of proofs:** `rlibrary(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rlibrary/1` Recursive version of the `library/1` predicate using default options. **Compilation flags:** `static` **Template:** `rlibrary(Library)` **Mode and number of proofs:** `rlibrary(+atom)` - `one` ------------------------------------------------------------------------ ###### `all/1` Scans all loaded entities and prints their metric scores using the given options. **Compilation flags:** `static` **Template:** `all(Options)` **Mode and number of proofs:** `all(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `all/0` Scans all loaded entities and prints their metric scores using default options. **Compilation flags:** `static` **Mode and number of proofs:** `all` - `one` ------------------------------------------------------------------------ ###### `entity_score/2` Score is a term that represents the metric score associated with a loaded entity. Fails if the metric does not apply. **Compilation flags:** `static` **Template:** `entity_score(Entity,Score)` **Mode and number of proofs:** `entity_score(@entity_identifier,-ground)` - `zero_or_one` ------------------------------------------------------------------------ ###### `library_score/2` Score is a term that represents the metric score associated with a loaded library source files. Fails if the metric does not apply. **Compilation flags:** `static` **Template:** `library_score(Library,Score)` **Mode and number of proofs:** `library_score(@atom,-ground)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rlibrary_score/2` Score is a term that represents the metric score associated with loaded source files from a library and its sub-libraries. Fails if the metric does not apply. **Compilation flags:** `static` **Template:** `rlibrary_score(Library,Score)` **Mode and number of proofs:** `rlibrary_score(@atom,-ground)` - `zero_or_one` ------------------------------------------------------------------------ ###### `file_score/2` Score is a term that represents the metric score associated with a loaded source file. Fails if the metric does not apply. **Compilation flags:** `static` **Template:** `file_score(File,Score)` **Mode and number of proofs:** `file_score(@atom,-ground)` - `zero_or_one` ------------------------------------------------------------------------ ###### `directory_score/2` Score is a term that represents the metric score associated with loaded source files from a directory. Fails if the metric does not apply. **Compilation flags:** `static` **Template:** `directory_score(Directory,Score)` **Mode and number of proofs:** `directory_score(@atom,-ground)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rdirectory_score/2` Score is a term that represents the metric score associated with loaded source files from a directory and its sub-directories. Fails if the metric does not apply. **Compilation flags:** `static` **Template:** `rdirectory_score(Directory,Score)` **Mode and number of proofs:** `rdirectory_score(@atom,-ground)` - `zero_or_one` ------------------------------------------------------------------------ ###### `all_score/1` Score is a term that represents the metric score associated with all loaded source files. Fails if the metric does not apply. **Compilation flags:** `static` **Template:** `all_score(Score)` **Mode and number of proofs:** `all_score(-ground)` - `zero_or_one` ------------------------------------------------------------------------ ###### `format_entity_score//2` Formats the entity score for pretty printing. **Compilation flags:** `static` **Template:** `format_entity_score(Entity,Score)` **Mode and number of proofs:** `format_entity_score(@entity_identifier,+ground)` - `one` ------------------------------------------------------------------------ ##### Protected predicates ###### `process_entity/2` Processes an entity of the given kind. **Compilation flags:** `static` **Template:** `process_entity(Kind,Entity)` **Mode and number of proofs:** `process_entity(+atom,@entity_identifier)` - `one` ------------------------------------------------------------------------ ###### `process_file/2` Processes a source file using the given options. **Compilation flags:** `static` **Template:** `process_file(Path,Options)` **Mode and number of proofs:** `process_file(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `process_directory/2` Processes a directory of source files using the given options. **Compilation flags:** `static` **Template:** `process_directory(Path,Options)` **Mode and number of proofs:** `process_directory(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `process_rdirectory/2` Recursively process a directory of source files using the given options. **Compilation flags:** `static` **Template:** `process_rdirectory(Path,Options)` **Mode and number of proofs:** `process_rdirectory(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `process_library/2` Processes a library of source files using the given options. **Compilation flags:** `static` **Template:** `process_library(Library,Options)` **Mode and number of proofs:** `process_library(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `process_rlibrary/2` Recursively process a library of source files using the given options. **Compilation flags:** `static` **Template:** `process_rlibrary(Library,Options)` **Mode and number of proofs:** `process_rlibrary(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `process_all/1` Processes all loaded source code using the given options. **Compilation flags:** `static` **Template:** `process_all(Options)` **Mode and number of proofs:** `process_all(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `sub_directory/2` Enumerates, by backtracking, all directory sub-directories containing loaded files. **Compilation flags:** `static` **Template:** `sub_directory(Directory,SubDirectory)` **Mode and number of proofs:** `sub_directory(+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `sub_library/2` Enumerates, by backtracking, all library sub-libraries. **Compilation flags:** `static` **Template:** `sub_library(Library,SubLibrary)` **Mode and number of proofs:** `sub_library(+atom,-atom)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `code_metrics` Helper object to apply all loaded code metrics. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Ebrahim Azarisooreh and Paulo Moura **Version:** 0:1:0 **Date:** 2017-12-31 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metric **Uses:** logtalk **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `code_metrics_messages` Message translations for the `code_metrics` tool. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Ebrahim Azarisooreh and Paulo Moura **Version:** 0:8:0 **Date:** 2022-05-05 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `code_metrics_utilities` Internal predicates for analyzing source code. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Ebrahim Azarisooreh **Version:** 0:7:0 **Date:** 2024-03-28 **Compilation flags:** `static` **Uses:** list logtalk **Remarks:** > - Usage: This is meant to be imported by any metric added to the system. > > - Predicate Scope: This is meant for internal use by metrics only. As such, all provided predicates are protected. **Inherited public predicates:** (none) - Public predicates - Protected predicates - `ancestor/4` - `current_entity/1` - `declares_predicate/2` - `defines_predicate/2` - `defines_predicate/3` - `entity_calls/3` - `entity_kind/2` - `entity_property/2` - `entity_updates/3` - `not_excluded_file/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `ancestor/4` True if `Entity` descends from `Ancestor`, and `EntityKind` and `AncestorKind` unify with their respective entity types. **Compilation flags:** `static` **Template:** `ancestor(EntityKind,Entity,AncestorKind,Ancestor)` **Mode and number of proofs:** `ancestor(?entity,?entity_identifier,?entity,?entity_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `current_entity/1` True if `Entity` is a currently loaded entity. **Compilation flags:** `static` **Template:** `current_entity(Entity)` **Mode and number of proofs:** `current_entity(?entity_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `declares_predicate/2` True if `Entity` declares `Predicate` internally. **Compilation flags:** `static` **Template:** `declares_predicate(Entity,Predicate)` **Mode and number of proofs:** `declares_predicate(?entity_identifier,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `defines_predicate/2` True if `Entity` defines an implementation of `Predicate` internally. Auxiliary predicates are excluded from results. **Compilation flags:** `static` **Template:** `defines_predicate(Entity,Predicate)` **Mode and number of proofs:** `defines_predicate(?entity_identifier,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `defines_predicate/3` Same as `defines_predicate/2`, except `Property` is unified with a property of the predicate. **Compilation flags:** `static` **Template:** `defines_predicate(Entity,Predicate,Property)` **Mode and number of proofs:** `defines_predicate(?entity_identifier,?predicate_indicator,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `entity_calls/3` True if a predicate `Caller` within `Entity` makes a `Call`. **Compilation flags:** `static` **Template:** `entity_calls(Entity,Caller,Call)` **Mode and number of proofs:** `entity_calls(?entity_identifier,?predicate_indicator,?predicate_indicator)` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity_kind/2` True if `Kind` defines `Entity` and is one of category, protocol, or object. **Compilation flags:** `static` **Template:** `entity_kind(Entity,Kind)` **Mode and number of proofs:** `entity_kind(+entity_identifier,-entity)` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity_property/2` True if `Property` is a valid property of `Entity`. Entity can be either a category, a protocol, or an object. **Compilation flags:** `static` **Template:** `entity_property(Entity,Property)` **Mode and number of proofs:** `entity_property(+entity_identifier,-term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `entity_updates/3` True if a predicate `Updater` within `Entity` makes a dynamic update to `Updated` (by using e.g. the `asserta/1` or `retract/1` predicates). **Compilation flags:** `static` **Template:** `entity_updates(Entity,Updater,Updated)` **Mode and number of proofs:** `entity_updates(+entity_identifier,?predicate_indicator,?predicate_indicator)` - `zero_or_one` ------------------------------------------------------------------------ ###### `not_excluded_file/3` True if the file is not being excluded. **Compilation flags:** `static` **Template:** `not_excluded_file(ExcludedFiles,Path,Basename)` **Mode and number of proofs:** `not_excluded_file(+list(atom),+atom,+atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `cogc_metric` Cognitive complexity metric (approximation). For each non-auxiliary predicate, the score contribution is the number of extra clauses (i.e. number of clauses minus one, for multi-clause branching) plus one if the predicate is directly recursive. The entity score is the sum of all predicate contributions. Protocols are not scored as they cannot define predicates. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk numberlist **Remarks:** > - Limitations: The reflection API does not expose control constructs such as cuts, conditionals, or disjunctions. This metric approximates cognitive complexity using only clause-level branching and direct recursion. > > - Branching: A predicate with N clauses contributes N-1 to the score, representing the N-1 extra choices a reader must track. > > - Recursion: A predicate that directly calls itself (within the same entity) contributes an additional 1 to the score. > > - Score interpretation: The score is represented by a non-negative integer. Higher scores indicate predicates or entities that are harder to understand due to more branching choices or self-recursion. A score of 0 means all predicates are single-clause and non-recursive. > > - Aggregation: File, directory, and library scores are computed by summing the individual entity scores. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `coupling_metric` Computes entity efferent coupling, afferent coupling, instability, abstractness, and distance from the main sequence. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Ebrahim Azarisooreh and Paulo Moura **Version:** 0:15:0 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Uses:** list **Remarks:** > - Efferent coupling (Ce): Number of entities that an entity depends on. > > - Afferent coupling (Ca): Number of entities that depend on an entity. > > - Instability (I): Computed as `Ce`` ``/`` ``(Ce`` ``+`` ``Ca)`. Measures the entity resilience to change. Ranging from 0 to 1, with 0 indicating a maximally stable entity and 1 indicating a maximally unstable entity. Ideally, an entity is either maximally stable or maximally unstable. > > - Abstractness (A): Computed as the ratio between the number of static predicates with scope directives without a local definition and the number of static predicates with scope directives. Measures the rigidity of an entity. Ranging from 0 to 1, with 0 indicating a fully concrete entity and 1 indicating a fully abstract entity. > > - Distance from main sequence (D): Computed as `abs(A`` ``+`` ``I`` ``-`` ``1)`. Measures how far an entity is from the idealized line `A`` ``+`` ``I`` ``=`` ``1`. Ranging from 0 to 1, with 0 indicating the entity is on the main sequence and 1 indicating it is as far as possible (either maximally abstract and stable, or maximally concrete and unstable). > > - Entity score: Represented as the compound term `ce_ca_i_a_d(Ce,Ca,I,A,D)`. > > - Dependencies count: Includes direct entity relations plus calls or dynamic updates to predicates in external objects or categories. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `dit_metric` Analyzes the depth of inheritance for objects, protocols, and categories. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Ebrahim Azarisooreh **Version:** 0:6:2 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Uses:** numberlist **Remarks:** > - Depth: The depth is the maximum length of a node to the root entity. Lower scores are generally better. > > - Inheritance: A level of inheritance defined by either one of specialization, instantiation, extension, importation, or implementation. > > - Scoring: The maximum path length is determined for each entity in question. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `doc_metric` Entity and entity predicates documentation score. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 0:13:1 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Uses:** list numberlist **Remarks:** > - Score range: Score is a integer percentage where a 100% score means that all expected documentation information is present. > > - Score weights: The score is split by default between 20% for the entity documentation and 80% for the entity predicates documentation, Can be customized using the predicate `entity_predicates_weights_hook/2`. > > - Score customization: The individual scores of entity `info/1` pairs and predicate `info/2` pairs can be customized using the `entity_info_pair_score_hook/3` and `predicate_info_pair_score_hook/4` predicates. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - `entity_predicates_weights_hook/2` - `entity_info_score_hook/2` - `entity_info_pair_score_hook/3` - `predicate_mode_score_hook/3` - `predicate_mode_score_hook/5` - `predicate_info_score_hook/3` - `predicate_info_pair_score_hook/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `entity_predicates_weights_hook/2` Relative weight between entity documentation and predicates documentation in percentage. The sum of the two values must be equal to 100. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `entity_predicates_weights_hook(EntityWeight,PredicatesWeight)` **Mode and number of proofs:** `entity_predicates_weights_hook(?integer,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity_info_score_hook/2` Maximum score for entity `info/1` directives. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `entity_info_score_hook(Entity,MaximumScore)` **Mode and number of proofs:** `entity_info_score_hook(?term,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity_info_pair_score_hook/3` Score for relevant entity `info/1` directive pairs. If defined, the `entity_info_score_hook/2` predicate should be defined accordingly. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `entity_info_pair_score_hook(Pair,Entity,Score)` **Mode and number of proofs:** `entity_info_pair_score_hook(?callable,?term,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `predicate_mode_score_hook/3` Maximum score for predicate `mode/2` directives. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `predicate_mode_score_hook(Entity,Predicate,MaximumScore)` **Mode and number of proofs:** `predicate_mode_score_hook(?term,?term,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `predicate_mode_score_hook/5` Score for a predicate `mode/2` directive. If defined, the `predicate_mode_score_hook/3` predicate should be defined accordingly. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `predicate_mode_score_hook(Template,Solutions,Entity,Predicate,Score)` **Mode and number of proofs:** `predicate_mode_score_hook(?term,?term,?term,?term,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `predicate_info_score_hook/3` Maximum score for predicate `info/2` directives. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `predicate_info_score_hook(Entity,Predicate,MaximumScore)` **Mode and number of proofs:** `predicate_info_score_hook(?term,?term,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `predicate_info_pair_score_hook/4` Score for a predicate `info/2` directive pairs. If defined, the `predicate_info_score_hook/3` predicate should be defined accordingly. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `predicate_info_pair_score_hook(Pair,Entity,Predicate,Score)` **Mode and number of proofs:** `predicate_info_pair_score_hook(?callable,?term,?term,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `halstead_metric` Computes Halstead complexity numbers for an entity using a Stroud of 18. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2018-06-08 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` halstead_metric(18) **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `halstead_metric(Stroud)` - `Stroud` - Coefficient for computing the time required to program. Computes Halstead complexity numbers for an entity. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 0:10:0 **Date:** 2025-01-04 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Uses:** list numberlist pairs **Remarks:** > - Definition of operators: Predicates declared, user-defined, and called are interpreted as operators. Built-in predicates and built-in control constructs are ignored. > > - Definition of operands: Predicate arguments are abstracted and interpreted as operands. Note that this definition of operands is a significant deviation from the original definition, which used syntactic literals. > > - Pn: Number of distinct predicates (declared, defined, called, or updated). > > - PAn: Number of predicate arguments (assumed distinct). > > - Cn: Number of predicate calls/updates + number of clauses. > > - CAn: Number of predicate call/update arguments + number of clause head arguments. > > - EV: Entity vocabulary: `EV`` ``=`` ``Pn`` ``+`` ``PAn`. > > - EL: Entity length: `EL`` ``=`` ``Cn`` ``+`` ``CAn`. > > - V: Volume: `V`` ``=`` ``EL`` ``*`` ``log2(EV)`. > > - D: Difficulty: `D`` ``=`` ``(Pn/2)`` ``*`` ``(CAn/An)`. > > - E: Effort: `E`` ``=`` ``D`` ``*`` ``V`. > > - T: Time required to program: `T`` ``=`` ``E/k` seconds (`k` is the Stroud number; defaults to 18). > > - B: Number of delivered bugs: `B`` ``=`` ``V/3000`. > > - Entity score: Represented as the compound term `pn_pan_cn_can_ev_el_v_d_e_t_b/11`. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `lcom_metric` Lack of Cohesion Of Methods metric (LCOM4). **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-30 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk **Remarks:** > - Score computation: Computes the number of connected components in the undirected graph whose nodes are the locally defined predicates and whose edges represent direct internal calls between them. > > - Score interpretation: A score of 1 indicates a fully cohesive entity. Higher scores indicate that the entity may benefit from being split. Protocols are not scored as they cannot define predicates. > > - Score representation: The score is represented by the compound term `lcom(Components,`` ``Predicates)` where `Components` is the number of connected components and `Predicates` is the total number of locally defined (non-auxiliary) predicates. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `lines_metric` Computes the number of lines of code, comments, and blanks by calling cloc and parsing its report file output. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-07-22 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** atom list logtalk os user **Remarks:** > - Entity line range: Entity scores are computed by querying entity lines(BeginLine, EndLine) and running cloc on a temporary file containing only that line range. > > - External dependency: Requires `cloc` to be available in `PATH`. > > - Entity score: Represented as the compound term `lines(Code,`` ``Comments,`` ``Blanks)`. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `mi_metric` Computes the maintainability index metric based on the Cyclomatic Complexity and the Halstead Volume metrics an entity using a Stroud of 18. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` mi_metric(18) **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `mi_metric(Stroud)` - `Stroud` - Halstead metric coefficient for computing the time required to program. Computes the maintainability index metric based on the Cyclomatic Complexity, Halstead Volume, and lines of code metrics for an entity. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Uses:** cc_metric halstead_metric(Stroud) lines_metric **Remarks:** > - Formula: The original equation is used: `MI`` ``=`` ``171`` ``-`` ``5.2`` ``*`` ``ln(V)`` ``-`` ``0.23`` ``*`` ``C`` ``-`` ``16.2`` ``*`` ``ln(L)`. V is the Halstead volume, C is the Cyclomatic Complexity, and L is the number of code lines. > > - Entity score: Represented as the compound term `mi(MI)`. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `noc_metric` Number of entity clauses metric. The score is represented using the compound term `number_of_clauses(Total,`` ``User)`. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Ebrahim Azarisooreh and Paulo Moura **Version:** 0:14:2 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `nor_metric` Number of entity rules metric. The score is represented using the compound term `number_of_rules(Total,`` ``User)`. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 0:5:2 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `rfc_metric` Response For a Class (RFC) metric. The score is the number of distinct predicates in the response set: the locally defined (non-auxiliary) predicates plus all distinct predicates they directly call or update. Protocols are not scored as they cannot define predicates. The score is represented by a non-negative integer. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk numberlist **Remarks:** > - Response set: The response set RS(E) for an entity E is the union of its locally defined (non-auxiliary) predicates and all predicates directly called or updated by those predicates. > > - Score interpretation: Higher scores indicate entities with more potential execution paths in response to a message, which may increase testing effort. > > - Aggregation: When computing scores for files, directories, and libraries, the individual entity scores are summed. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `size_metric` Source code size metric. Returned scores are upper bounds and based solely in source file sizes (expressed in bytes). **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 0:7:2 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk numberlist os **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `upn_metric` Number of unique predicates nodes metric. The nodes include called and updated predicates independently of where they are defined. The score is represented by a non-negative integer. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 0:6:3 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk numberlist **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `wmc_metric` Weighted Methods per Class (WMC) metric. Uses unit weights, i.e., the score is the number of locally defined (non-auxiliary) predicates. Protocols are not scored as they cannot define predicates. The score is represented by a non-negative integer. **Availability:** `logtalk_load(code_metrics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` code_metrics_utilities `public` code_metric **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk numberlist **Remarks:** > - Unit weights: Each predicate is assigned a weight of 1. A cyclomatic-complexity-weighted variant is not provided as the Logtalk reflection API does not expose intra-clause branching structure (if-then-else, disjunction), which would produce the same approximations as the `cc_metric`. > > - Interpretation: Higher scores indicate an entity with more responsibilities that may benefit from being split. > > - Aggregation: When computing scores for files, directories, and libraries, the individual entity scores are summed. **Inherited public predicates:**  all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### colley_ranker") **object** #### `colley_ranker` Colley pairwise preference ranker. Learns one deterministic rating per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by solving the Colley linear system built from aggregated pairwise outcomes and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(colley_ranker(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common `public` pairwise_strength_ranker_common **Uses:** avltree list numberlist **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, copeland_ranker, rank_centrality ### combinations") **object** #### `combinations` Implementation of combinations operations over lists. **Availability:** `logtalk_load(combinations(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` combinations_protocol **Uses:** fast_random(Algorithm) list natural **Remarks:** (none) **Inherited public predicates:**  combination/3  combination/4  combination_index/4  combination_index/5  combinations/3  combinations/4  count_combinations/3  count_distinct_combinations/3  distinct_combination/3  distinct_combination/4  distinct_combination_index/4  distinct_combinations/3  distinct_combinations/4  next_combination/3  nth_combination/4  nth_combination/5  nth_distinct_combination/4  previous_combination/3  random_combination/3  random_distinct_combination/3  sample_combinations/4  sample_distinct_combinations/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `combinations_protocol` Protocol for combinations operations over lists. **Availability:** `logtalk_load(combinations(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-12 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `combinations/3` - `combination/3` - `combinations/4` - `combination/4` - `distinct_combinations/3` - `distinct_combination/3` - `distinct_combinations/4` - `distinct_combination/4` - `nth_combination/4` - `nth_combination/5` - `combination_index/4` - `combination_index/5` - `count_combinations/3` - `count_distinct_combinations/3` - `nth_distinct_combination/4` - `distinct_combination_index/4` - `random_combination/3` - `sample_combinations/4` - `random_distinct_combination/3` - `sample_distinct_combinations/4` - `next_combination/3` - `previous_combination/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `combinations/3` Generates all K-element combinations of a list using default order. **Compilation flags:** `static` **Template:** `combinations(K,List,Combinations)` **Mode and number of proofs:** `combinations(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `combination/3` True iff the third argument is a K-element combination of a list using default order. **Compilation flags:** `static` **Template:** `combination(K,List,Combination)` **Mode and number of proofs:** `combination(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `combinations/4` Generates all K-element combinations with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `combinations(K,List,Order,Combinations)` **Mode and number of proofs:** `combinations(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `combination/4` True iff the fourth argument is a K-element combination with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `combination(K,List,Order,Combination)` **Mode and number of proofs:** `combination(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_combinations/3` Generates all distinct K-element combinations of a list (deduplicating equal-valued combinations) using default order. **Compilation flags:** `static` **Template:** `distinct_combinations(K,List,Combinations)` **Mode and number of proofs:** `distinct_combinations(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_combination/3` True iff the third argument is a distinct K-element combination of a list using default order. **Compilation flags:** `static` **Template:** `distinct_combination(K,List,Combination)` **Mode and number of proofs:** `distinct_combination(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_combinations/4` Generates all distinct K-element combinations with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `distinct_combinations(K,List,Order,Combinations)` **Mode and number of proofs:** `distinct_combinations(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_combination/4` True iff the fourth argument is a distinct K-element combination with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `distinct_combination(K,List,Order,Combination)` **Mode and number of proofs:** `distinct_combination(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `nth_combination/4` Returns the combination at a given zero-based index using default order. **Compilation flags:** `static` **Template:** `nth_combination(K,List,Index,Combination)` **Mode and number of proofs:** `nth_combination(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_combination/5` Returns the combination at a given zero-based index in the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `nth_combination(K,List,Order,Index,Combination)` **Mode and number of proofs:** `nth_combination(+integer,+list,+atom,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `combination_index/4` Returns the zero-based index of a combination using default order. **Compilation flags:** `static` **Template:** `combination_index(K,List,Combination,Index)` **Mode and number of proofs:** `combination_index(+integer,+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `combination_index/5` Returns the zero-based index of a combination in the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `combination_index(K,List,Order,Combination,Index)` **Mode and number of proofs:** `combination_index(+integer,+list,+atom,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `count_combinations/3` Counts the number of K-element combinations of a list. **Compilation flags:** `static` **Template:** `count_combinations(K,List,Count)` **Mode and number of proofs:** `count_combinations(+integer,+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `count_distinct_combinations/3` Counts the number of distinct K-element combinations of a list (deduplicating equal-valued combinations). **Compilation flags:** `static` **Template:** `count_distinct_combinations(K,List,Count)` **Mode and number of proofs:** `count_distinct_combinations(+integer,+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `nth_distinct_combination/4` Returns the distinct combination at a given zero-based index in default generation order. **Compilation flags:** `static` **Template:** `nth_distinct_combination(K,List,Index,Combination)` **Mode and number of proofs:** `nth_distinct_combination(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_combination_index/4` Returns the zero-based index of a distinct combination in default generation order. **Compilation flags:** `static` **Template:** `distinct_combination_index(K,List,Combination,Index)` **Mode and number of proofs:** `distinct_combination_index(+integer,+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_combination/3` Returns a random K-element combination of a list. **Compilation flags:** `static` **Template:** `random_combination(K,List,Combination)` **Mode and number of proofs:** `random_combination(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_combinations/4` Returns SampleCount random K-element combinations of a list, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_combinations(K,List,SampleCount,Samples)` **Mode and number of proofs:** `sample_combinations(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_distinct_combination/3` Returns a random distinct K-element combination of a list (deduplicating equal-valued combinations). **Compilation flags:** `static` **Template:** `random_distinct_combination(K,List,Combination)` **Mode and number of proofs:** `random_distinct_combination(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_distinct_combinations/4` Returns SampleCount random distinct K-element combinations of a list, sampled with replacement after deduplicating equal-valued combinations. **Compilation flags:** `static` **Template:** `sample_distinct_combinations(K,List,SampleCount,Samples)` **Mode and number of proofs:** `sample_distinct_combinations(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next_combination/3` Returns the next distinct combination value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `next_combination(List,Combination,Next)` **Mode and number of proofs:** `next_combination(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_combination/3` Returns the previous distinct combination value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `previous_combination(List,Combination,Previous)` **Mode and number of proofs:** `previous_combination(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### command_line_options") **category** #### `command_line_option` Category for defining command-line options. Import this category into objects that represent individual command-line options and override the predicates as needed. **Availability:** `logtalk_load(command_line_options(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-13 **Compilation flags:** `static` **Uses:** type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `check/0` - `valid/0` - `name/1` - `short_flags/1` - `long_flags/1` - `type/1` - `default/1` - `meta/1` - `help/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `check/0` Checks if the command-line option definition is valid. Throws an error if the definition is invalid. **Compilation flags:** `static` **Mode and number of proofs:** `check` - `one_or_error` **Exceptions:** The importing object does not define the `name/1` predicate: `existence_error(procedure,name/1)` The argument of the `name/1` predicate is a variable: `instantiation_error` The argument `Name` of the `name/1` predicate is neither a variable nor an atom: `type_error(atom,Name)` The importing returns values with invalid types for the option declaration predicates: `error` ------------------------------------------------------------------------ ###### `valid/0` Succeeds if the command-line option definition is valid. Fails otherwise. **Compilation flags:** `static` **Mode and number of proofs:** `valid` - `zero_or_one` ------------------------------------------------------------------------ ###### `name/1` Name used to identify this option in the parsed results. This predicate must be overridden. No default. **Compilation flags:** `static` **Template:** `name(Name)` **Mode and number of proofs:** `name(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `short_flags/1` List of single-character short flags for this option (e.g., `[v]` for `-v`). Default is an empty list. **Compilation flags:** `static` **Template:** `short_flags(Flags)` **Mode and number of proofs:** `short_flags(-list(character))` - `one` ------------------------------------------------------------------------ ###### `long_flags/1` List of long flags for this option (e.g., `[verbose]` for `--verbose`). Default is an empty list. **Compilation flags:** `static` **Template:** `long_flags(Flags)` **Mode and number of proofs:** `long_flags(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `type/1` Option value type. One of `boolean`, `atom`, `integer`, `float`, or `term`. Default is `term`. **Compilation flags:** `static` **Template:** `type(Type)` **Mode and number of proofs:** `type(-atom)` - `one` ------------------------------------------------------------------------ ###### `default/1` Default value for this option if any. **Compilation flags:** `static` **Template:** `default(Default)` **Mode and number of proofs:** `default(-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `meta/1` Metasyntactic variable name for the help text (e.g., `'FILE'`). Default is an empty atom. **Compilation flags:** `static` **Template:** `meta(Meta)` **Mode and number of proofs:** `meta(-atom)` - `one` ------------------------------------------------------------------------ ###### `help/1` Help text for this option. Can be an atom or a list of atoms for pre-broken lines. Default is an empty atom. **Compilation flags:** `static` **Template:** `help(Help)` **Mode and number of proofs:** `help(-atom)` - `one` `help(-list(atom))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also command_line_options **object** #### `command_line_options` Command line options parsing predicates. Uses object-based option specifications with the `command_line_option` category. **Availability:** `logtalk_load(command_line_options(loader))` **Author:** Marcus Uneson and Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** atom list meta numberlist term_io type user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `parse/4` - `parse/5` - `help/2` - `help/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/4` Parses the arguments `AppArguments` according to the option objects `OptionObjects` using default parsing options. **Compilation flags:** `static` **Template:** `parse(OptionObjects,AppArguments,Options,PositionalArguments)` **Mode and number of proofs:** `parse(+list(object),+list(atom),-list,-list(atom))` - `one_or_error` **Exceptions:** `OptionObjects` is a variable, a partial list, or contains an option object definition with an insufficiently instantiated value: `instantiation_error` `OptionObjects` is neither a variable nor a list of valid object identifiers: `type_error(list(object),OptionObjects)` An option object is missing the `name/1` predicate: `existence_error(predicate,name/1)` An option object predicate returns a value with an invalid type: `type_error(Type,Term)` An option object predicate returns a value outside the expected domain: `domain_error(Domain,Term)` The option set contains a duplicate option name: `domain_error(unique_key,Name)` The option set contains a duplicate short flag: `domain_error(unique_short_flag,ShortFlag)` The option set contains a duplicate long flag: `domain_error(unique_long_flag,LongFlag)` `AppArguments` is a variable or a partial list: `instantiation_error` `AppArguments` is neither a variable nor a list of atoms: `type_error(list(atom),AppArguments)` An unknown flag is found: `existence_error(command_line_option,Argument)` A flag value cannot be parsed as the option type: `type_error(flag_value,Type)` A short option is written using the disallowed `-f=value` syntax: `syntax_error(disallowed:`` ``=)` ------------------------------------------------------------------------ ###### `parse/5` Parses the arguments `AppArguments` according to the option objects `OptionObjects` and the parsing options `ParseOptions`. `Options` is a list of parsed options as `Name(Value)` terms by default (or `Func(Name,Value)` when the `output_functor(Func)` parse option is used). `PositionalArguments` are the remaining non-dashed arguments. `ParseOptions` include `output_functor(Func)`, `duplicated_flags(Keep)` (one of `keepfirst`, `keeplast`, `keepall`; default `keeplast`), and `allow_empty_flag_spec(Bool)` (default `true`). **Compilation flags:** `static` **Template:** `parse(OptionObjects,AppArguments,Options,PositionalArguments,ParseOptions)` **Mode and number of proofs:** `parse(+list(object),+list(atom),-list,-list(atom),+list)` - `one_or_error` **Exceptions:** `ParseOptions` is a variable, a partial list, or contains a variable option: `instantiation_error` `ParseOptions` is neither a variable nor a list: `type_error(list,ParseOptions)` An element of `ParseOptions` is neither a variable nor a compound term: `type_error(compound,Option)` An element of `ParseOptions` is a compound term but not a valid option: `domain_error(option,Option)` `OptionObjects` is a variable, a partial list, or contains an option object definition with an insufficiently instantiated value: `instantiation_error` `OptionObjects` is neither a variable nor a list of valid object identifiers: `type_error(list(object),OptionObjects)` An option object is missing the `name/1` predicate: `existence_error(predicate,name/1)` An option object predicate returns a value with an invalid type: `type_error(Type,Term)` An option object predicate returns a value outside the expected domain: `domain_error(Domain,Term)` The option set contains a duplicate option name: `domain_error(unique_key,Name)` The option set contains a duplicate short flag: `domain_error(unique_short_flag,ShortFlag)` The option set contains a duplicate long flag: `domain_error(unique_long_flag,LongFlag)` An option has no short or long flags and empty flag specifications are disallowed: `domain_error(non_empty_flag_spec,Name)` `AppArguments` is a variable or a partial list: `instantiation_error` `AppArguments` is neither a variable nor a list of atoms: `type_error(list(atom),AppArguments)` An unknown flag is found: `existence_error(command_line_option,Argument)` A flag value cannot be parsed as the option type: `type_error(flag_value,Type)` A short option is written using the disallowed `-f=value` syntax: `syntax_error(disallowed:`` ``=)` ------------------------------------------------------------------------ ###### `help/2` Synthesizes a help text `Help` as an atom from the option objects `OptionObjects` using default help options. **Compilation flags:** `static` **Template:** `help(OptionObjects,Help)` **Mode and number of proofs:** `help(+list(object),-atom)` - `one_or_error` **Exceptions:** `OptionObjects` is a variable, a partial list, or contains an option object definition with an insufficiently instantiated value: `instantiation_error` `OptionObjects` is neither a variable nor a list of valid object identifiers: `type_error(list(object),OptionObjects)` An option object is missing the `name/1` predicate: `existence_error(predicate,name/1)` An option object predicate returns a value with an invalid type: `type_error(Type,Term)` An option object predicate returns a value outside the expected domain: `domain_error(Domain,Term)` The option set contains a duplicate option name: `domain_error(unique_key,Name)` The option set contains a duplicate short flag: `domain_error(unique_short_flag,ShortFlag)` The option set contains a duplicate long flag: `domain_error(unique_long_flag,LongFlag)` ------------------------------------------------------------------------ ###### `help/3` Synthesizes a help text `Help` as an atom from the option objects `OptionObjects` using the given `HelpOptions`. `HelpOptions` include `line_width(Width)` (default 80), `min_help_width(Width)` (default 40), `break_long_flags(Boolean)` (default `false`), `suppress_empty_meta(Boolean)` (default `true`), and `allow_empty_flag_spec(Bool)` (default `true`). **Compilation flags:** `static` **Template:** `help(OptionObjects,Help,HelpOptions)` **Mode and number of proofs:** `help(+list(object),-atom,+list)` - `one_or_error` **Exceptions:** `HelpOptions` is a variable, a partial list, or contains a variable option: `instantiation_error` `HelpOptions` is neither a variable nor a list: `type_error(list,HelpOptions)` An element of `HelpOptions` is neither a variable nor a compound term: `type_error(compound,Option)` An element of `HelpOptions` is a compound term but not a valid option: `domain_error(option,Option)` `OptionObjects` is a variable, a partial list, or contains an option object definition with an insufficiently instantiated value: `instantiation_error` `OptionObjects` is neither a variable nor a list of valid object identifiers: `type_error(list(object),OptionObjects)` An option object is missing the `name/1` predicate: `existence_error(predicate,name/1)` An option object predicate returns a value with an invalid type: `type_error(Type,Term)` An option object predicate returns a value outside the expected domain: `domain_error(Domain,Term)` The option set contains a duplicate option name: `domain_error(unique_key,Name)` The option set contains a duplicate short flag: `domain_error(unique_short_flag,ShortFlag)` The option set contains a duplicate long flag: `domain_error(unique_long_flag,LongFlag)` An option has no short or long flags and empty flag specifications are disallowed: `domain_error(non_empty_flag_spec,Name)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also command_line_option ### copeland_ranker") **object** #### `copeland_ranker` Copeland pairwise preference ranker. Learns one deterministic score per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by comparing aggregated head-to-head outcomes for each observed matchup and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(copeland_ranker(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, bradley_terry_ranker ### core") **category** #### `core_messages` Logtalk core (compiler and runtime) default message tokenization. **Availability:** `built_in` **Author:** Paulo Moura **Version:** 1:148:0 **Date:** 2026-06-03 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `expanding` Term and goal expansion protocol. **Availability:** `built_in` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2016-07-12 **Compilation flags:** `static,`` ``built_in` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `goal_expansion/2` - `term_expansion/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `goal_expansion/2` Defines a goal expansion. Called recursively until a fixed point is reached on goals found while compiling a source file (except for goals wrapped using the `{}/1` compiler bypass control construct). **Compilation flags:** `static` **Template:** `goal_expansion(Goal,ExpandedGoal)` **Mode and number of proofs:** `goal_expansion(+callable,-callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `term_expansion/2` Defines a term expansion. Called until it succeeds on all terms read while compiling a source file (except for terms skipped by using the conditional compilation directives or wrapped using the `{}/1` compiler bypass control construct). **Compilation flags:** `static` **Template:** `term_expansion(Term,ExpandedTerms)` **Mode and number of proofs:** `term_expansion(+term,-term)` - `zero_or_one` `term_expansion(+term,-list(term))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `forwarding` Message forwarding protocol. **Availability:** `built_in` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2025-05-15 **Compilation flags:** `static,`` ``built_in` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `forward/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `forward/1` User-defined message forwarding handler, automatically called (if defined) by the runtime for any message that the receiving object does not understand. **Compilation flags:** `static` **Template:** `forward(Message)` **Mode and number of proofs:** `forward(+callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `logtalk` Built-in object providing message printing, debugging, library, source file, halt predicates, and hacking methods. **Availability:** `built_in` **Author:** Paulo Moura **Version:** 3:5:0 **Date:** 2026-05-04 **Compilation flags:** `static,`` ``built_in,`` ``context_switching_calls,`` ``threaded` **Dependencies:** (none) **Remarks:** > - Default message kinds: `silent`, `silent(Key)`, `banner`, `help`, `comment`, `comment(Key)`, `information`, `information(Key)`, `warning`, `warning(Key)`, `error`, `error(Key)`, `debug`, `debug(Key)`, `question`, and `question(Key)`. > > - Printing of silent messages: By default, silent messages are not printed. These messages are only useful when intercepted. > > - Printing of banner and comment messages: By default, banner and comment messages are only printed when the `report` flag is turned on. > > - Printing of help, information, and question messages: These messages are always printed by default as they provide requested output. > > - Printing of warning messages: By default, warning messages are not printed when the `report` flag is turned off. > > - Printing of error messages: These messages are always printed by default. > > - Printing of debug messages: By default, debug messages are only printed when the `debug` flag is turned on. The compiler suppresses debug message printing goals when compiling in optimized mode. > > - Meta messages: A *meta message* is a message that have another message as argument and is typically used for debugging messages. Meta messages avoid the need of defining tokenizer rules for every message but can be intercepted as any other message. > > - Meta message `@Message`: By default, the message is printed as passed to the `write/1` predicate followed by a newline. > > - Meta message `Key-Value`: By default, the message is printed as “Key: Value” followed by a newline. The key is printed as passed to the `write/1` predicate while the value is printed as passed to the `writeq/1` predicate. > > - Meta message `Format+Arguments`: By default, the message is printed as passed to the `format/2` predicate. > > - Meta message `List`: By default, the list items are printed indented one per line. The items are preceded by a dash and can be `@Message`, `Key-Value`, or `Format+Arguments` messages. If that is not the case, the item is printed as passed to the `writeq/1` predicate. > > - Meta message `Title::List`: By default, the title is printed followed by a newline and the indented list items, one per line. The items are printed as in the `List` meta message. > > - Meta message `[Stream,Prefix]>>Goal`: By default, call user-defined `Goal` in the context of `user`. The use of a lambda expression allows passing the message stream and prefix. Printing the prefix is delegated to the goal. > > - Meta message `[Stream]>>Goal`: By default, call user-defined `Goal` in the context of `user`. The use of a lambda expression allows passing the message stream. > > - Message tokens: `at_same_line`, `tab(Expression)`, `nl`, `flush`, `Format-Arguments`, `term(Term,Options)`, `ansi(Attributes,Format,Arguments)`, `begin(Kind,Variable)`, and `end(Variable)`. > > - Multi-threading applications: Predicates calling methods such as `print_message/3`, `ask_question/5`, or `compile_aux_clauses/1` may need to be declared synchronized in order to avoid race conditions. **Inherited public predicates:** (none) - Public predicates - `print_message/3` - `print_message_tokens/3` - `print_message_token/4` - `message_tokens//2` - `message_prefix_stream/4` - `message_prefix_file/6` - `message_hook/4` - `ask_question/5` - `question_hook/6` - `question_prompt_stream/4` - `trace_event/2` - `debug_handler/1` - `active_debug_handler/1` - `activate_debug_handler/1` - `deactivate_debug_handler/0` - `debug_handler/3` - `expand_library_path/2` - `loaded_file/1` - `loaded_file_property/2` - `loaded_files_topological_sort/1` - `loaded_files_topological_sort/2` - `file_type_extension/2` - `halt/1` - `halt/0` - `halt_hook/2` - `compile_aux_clauses/1` - `entity_prefix/2` - `compile_predicate_heads/4` - `compile_predicate_indicators/3` - `decompile_predicate_heads/4` - `decompile_predicate_indicators/4` - `execution_context/7` - Protected predicates - Private predicates - `active_debug_handler_/1` - Operators ##### Public predicates ###### `print_message/3` Prints a message of the given kind for the specified component. **Compilation flags:** `static` **Template:** `print_message(Kind,Component,Message)` **Mode and number of proofs:** `print_message(+nonvar,+nonvar,+nonvar)` - `one` ------------------------------------------------------------------------ ###### `print_message_tokens/3` Print the messages tokens to the given stream, prefixing each line with the specified atom. **Compilation flags:** `static` **Template:** `print_message_tokens(Stream,Prefix,Tokens)` **Mode and number of proofs:** `print_message_tokens(@stream_or_alias,+atom,@list(nonvar))` - `one` ------------------------------------------------------------------------ ###### `print_message_token/4` User-defined hook predicate for printing a message token (see this object remarks). **Compilation flags:** `dynamic,`` ``multifile` **Template:** `print_message_token(Stream,Prefix,Token,Tokens)` **Mode and number of proofs:** `print_message_token(@stream_or_alias,@atom,@nonvar,@list(nonvar))` - `zero_or_one` ------------------------------------------------------------------------ ###### `message_tokens//2` User-defined hook grammar rule for converting a message into a list of tokens (see this object remarks). **Compilation flags:** `dynamic,`` ``multifile` **Template:** `message_tokens(Message,Component)` **Mode and number of proofs:** `message_tokens(+nonvar,+nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `message_prefix_stream/4` Message line prefix and output stream to be used when printing a message given its kind and component. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `message_prefix_stream(Kind,Component,Prefix,Stream)` **Mode and number of proofs:** `message_prefix_stream(?nonvar,?nonvar,?atom,?stream_or_alias)` - `zero_or_more` ------------------------------------------------------------------------ ###### `message_prefix_file/6` Message line prefix and output file to be used when printing a message given its kind and component. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `message_prefix_file(Kind,Component,Prefix,File,Mode,Options)` **Mode and number of proofs:** `message_prefix_file(?nonvar,?nonvar,?atom,?atom,?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `message_hook/4` User-defined hook predicate for intercepting message printing calls. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `message_hook(Message,Kind,Component,Tokens)` **Mode and number of proofs:** `message_hook(+nonvar,+nonvar,+nonvar,+list(nonvar))` - `zero_or_one` ------------------------------------------------------------------------ ###### `ask_question/5` Asks a question and reads the answer until the check predicate is true. **Compilation flags:** `static` **Template:** `ask_question(Kind,Component,Question,Check,Answer)` **Meta-predicate template:** `ask_question(*,*,*,1,*)` **Mode and number of proofs:** `ask_question(+nonvar,+nonvar,+nonvar,+callable,-term)` - `one` ------------------------------------------------------------------------ ###### `question_hook/6` User-defined hook predicate for intercepting question asking calls. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `question_hook(Question,Kind,Component,Tokens,Check,Answer)` **Meta-predicate template:** `question_hook(*,*,*,*,1,*)` **Mode and number of proofs:** `question_hook(+nonvar,+nonvar,+nonvar,+list(nonvar),+callable,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `question_prompt_stream/4` Prompt and input stream to be used when asking a question given its kind and component. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `question_prompt_stream(Kind,Component,Prompt,Stream)` **Mode and number of proofs:** `question_prompt_stream(?nonvar,?nonvar,?atom,?stream_or_alias)` - `zero_or_more` ------------------------------------------------------------------------ ###### `trace_event/2` Trace event handler. The runtime calls all trace event handlers using a failure-driven loop before calling the debug event handler. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `trace_event(Event,ExecutionContext)` **Mode and number of proofs:** `trace_event(@callable,@execution_context)` - `zero` **Remarks:** > - Unification events: Generated after a successful unification with a fact - `fact(Entity,Fact,Clause,File,Line)` - or a rule head - `rule(Entity,Head,Clause,File,Line)`. > > - Goal events: Generated when calling a goal: `top_goal(Goal,CompiledGoal)` or `goal(Goal,CompiledGoal)`. ------------------------------------------------------------------------ ###### `debug_handler/1` Enumerates, by backtracking, all declared debug handler providers. Define a clause for this predicate to declare a new debug handler provider. **Compilation flags:** `static,`` ``multifile` **Template:** `debug_handler(Provider)` **Mode and number of proofs:** `debug_handler(?object_identifier)` - `zero_or_more` `debug_handler(?category_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `active_debug_handler/1` Current active debug handler provider if any. There is at most one active debug handler provider at any given moment. **Compilation flags:** `static` **Template:** `active_debug_handler(Provider)` **Mode and number of proofs:** `active_debug_handler(?category_identifier)` - `zero_or_one` `active_debug_handler(?category_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `activate_debug_handler/1` Activates the given debug handler provider. There is at most one active debug handler provider at any given moment. Fails if the object or category is not declared as a debug handler provider. **Compilation flags:** `static` **Template:** `activate_debug_handler(Provider)` **Mode and number of proofs:** `activate_debug_handler(@object_identifier)` - `zero_or_one` `activate_debug_handler(@category_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `deactivate_debug_handler/0` Deactivates the current debug handler provider if any. **Compilation flags:** `static` **Mode and number of proofs:** `deactivate_debug_handler` - `one` ------------------------------------------------------------------------ ###### `debug_handler/3` Debug event handler. Called by the runtime when the given provider is active. **Compilation flags:** `static,`` ``multifile` **Template:** `debug_handler(Provider,Event,ExecutionContext)` **Mode and number of proofs:** `debug_handler(+object_identifier,+callable,+execution_context)` - `zero_or_more` `debug_handler(+category_identifier,+callable,+execution_context)` - `zero_or_more` **Remarks:** > - Unification events: Generated after a successful unification with a fact - `fact(Entity,Fact,Clause,File,Line)` - or a rule head - `rule(Entity,Head,Clause,File,Line)`. > > - Goal events: Generated when calling a goal: `top_goal(Goal,CompiledGoal)` or `goal(Goal,CompiledGoal)`. ------------------------------------------------------------------------ ###### `expand_library_path/2` Expands a library alias (an atom) or a compound term (using library notation) into its absolute path. Uses a depth bound to prevent loops. **Compilation flags:** `static` **Template:** `expand_library_path(LibraryAlias,AbsolutePath)` **Mode and number of proofs:** `expand_library_path(+atom,?atom)` - `zero_or_one` `expand_library_path(+callable,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `loaded_file/1` Enumerates, by backtracking, all loaded files, returning their full paths. **Compilation flags:** `static` **Template:** `loaded_file(Path)` **Mode and number of proofs:** `loaded_file(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `loaded_file_property/2` Enumerates, by backtracking, loaded file properties. **Compilation flags:** `static` **Template:** `loaded_file_property(Path,Property)` **Mode and number of proofs:** `loaded_file_property(?atom,?compound)` - `zero_or_more` **Remarks:** > - Property `basename/1`: Basename of the file (includes the file extension, if any). > > - Property `directory/1`: Directory of the file (ending with a slash). > > - Property `mode/1`: Compilation mode of the file (possible values are `optimal`, `normal`, and `debug`). > > - Property `flags/1`: Explicit flags used for compiling the file. > > - Property `text_properties/1`: List of the file text properties (`encoding/1` and `bom/1`). Empty if no `encoding/1` directive is present and the stream used for reading the file does not have a `bom/1` (or equivalent) property. > > - Property `target/1`: Full path of the generated intermediate Prolog file. > > - Property `modified/1`: File modification time stamp (should be regarded as an opaque but otherwise comparable term). > > - Property `parent/1`: Full path of the parent file that loaded the file. > > - Property `includes/2`: Full path of a file included by the file and the line of the `include/1` directive. > > - Property `includes/1`: Full path of a file included by the file. > > - Property `library/1`: Library alias for the library that includes the file. > > - Property `object/3`: Identifier for an object defined in the file and the start and end lines of its definition. > > - Property `object/1`: Identifier for an object defined in the file. > > - Property `protocol/3`: Identifier for a protocol defined in the file and the start and end lines of its definition. > > - Property `protocol/1`: Identifier for a protocol defined in the file. > > - Property `category/3`: Identifier for a category defined in the file and the start and end lines of its definition. > > - Property `category/1`: Identifier for a category defined in the file. ------------------------------------------------------------------------ ###### `loaded_files_topological_sort/1` Returns a list of full paths for all loaded user-defined files sorted by dependencies. **Compilation flags:** `static` **Template:** `loaded_files_topological_sort(Sorted)` **Mode and number of proofs:** `loaded_files_topological_sort(--list(atom))` - `one` ------------------------------------------------------------------------ ###### `loaded_files_topological_sort/2` Sorts a list of full paths for loaded files by dependencies. **Compilation flags:** `static` **Template:** `loaded_files_topological_sort(Paths,Sorted)` **Mode and number of proofs:** `loaded_files_topological_sort(+list(atom),--list(atom))` - `one` ------------------------------------------------------------------------ ###### `file_type_extension/2` Enumerates, by backtracking, all defined file type extensions. The defined types are: `source`, `object`, `logtalk`, `prolog`, and `tmp`. The source type returns both `logtalk` and `prolog` type extensions. **Compilation flags:** `static` **Template:** `file_type_extension(Type,Extension)` **Mode and number of proofs:** `file_type_extension(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `halt/1` Halts the Logtalk process with the given exit code. Calls all defined halt hook goals whose exit code unifies with its argument. A warning message is printed in case of goal failures or errors (which are otherwise ignored). **Compilation flags:** `static` **Template:** `halt(ExitCode)` **Mode and number of proofs:** `halt(+integer)` - `one` ------------------------------------------------------------------------ ###### `halt/0` Halts the Logtalk process with the given exit code. Calls all defined halt hook goals whose exit code unifies with the integer zero. A warning message is printed in case of goal failures or errors (which are otherwise ignored). **Compilation flags:** `static` **Mode and number of proofs:** `halt` - `one` ------------------------------------------------------------------------ ###### `halt_hook/2` Hook predicate defining a goal to be called when sending the `halt/0-1` messages. **Compilation flags:** `dynamic,`` ``multifile` **Template:** `halt_hook(ExitCode,Goal)` **Mode and number of proofs:** `halt_hook(?var,?callable)` - `zero_or_more` `halt_hook(?integer,?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `compile_aux_clauses/1` Compiles a list of auxiliary clauses. Can only be called during source file compilation, usually from `term_expansion/2` or `goal_expansion/2` hook predicate definitions. **Compilation flags:** `static` **Template:** `compile_aux_clauses(Clauses)` **Mode and number of proofs:** `compile_aux_clauses(@list(clause))` - `one` ------------------------------------------------------------------------ ###### `entity_prefix/2` Converts between an entity identifier and the entity prefix that is used for its compiled code. When none of the arguments is instantiated, it returns the identifier and the prefix of the entity under compilation, if any. **Compilation flags:** `static` **Template:** `entity_prefix(Entity,Prefix)` **Mode and number of proofs:** `entity_prefix(?entity_identifier,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `compile_predicate_heads/4` Compiles clause heads. The heads are compiled in the context of the entity under compilation when the entity argument is not instantiated. **Compilation flags:** `static` **Template:** `compile_predicate_heads(Heads,Entity,CompiledHeads,ExecutionContext)` **Mode and number of proofs:** `compile_predicate_heads(@list(callable),?entity_identifier,-list(callable),@execution_context)` - `zero_or_one` `compile_predicate_heads(@conjunction(callable),?entity_identifier,-conjunction(callable),@execution_context)` - `zero_or_one` `compile_predicate_heads(@callable,?entity_identifier,-callable,@execution_context)` - `zero_or_one` ------------------------------------------------------------------------ ###### `compile_predicate_indicators/3` Compiles predicate indicators. The predicate are compiled in the context of the entity under compilation when the entity argument is not instantiated. **Compilation flags:** `static` **Template:** `compile_predicate_indicators(PredicateIndicators,Entity,CompiledPredicateIndicators)` **Mode and number of proofs:** `compile_predicate_indicators(@list(predicate_indicator),?entity_identifier,-list(predicate_indicator))` - `zero_or_one` `compile_predicate_indicators(@conjunction(predicate_indicator),?entity_identifier,-conjunction(predicate_indicator))` - `zero_or_one` `compile_predicate_indicators(@predicate_indicator,?entity_identifier,-predicate_indicator)` - `zero_or_one` ------------------------------------------------------------------------ ###### `decompile_predicate_heads/4` Decompiles clause heads. All compiled clause heads must belong to the same entity, which must be loaded. **Compilation flags:** `static` **Template:** `decompile_predicate_heads(CompiledHeads,Entity,Type,Heads)` **Mode and number of proofs:** `decompile_predicate_heads(@list(callable),-entity_identifier,-atom,-list(callable))` - `zero_or_one` `decompile_predicate_heads(@conjunction(callable),-entity_identifier,-atom,-conjunction(callable))` - `zero_or_one` `decompile_predicate_heads(@callable,-entity_identifier,-atom,-callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `decompile_predicate_indicators/4` Decompiles predicate indicators. All compiled predicate indicators must belong to the same entity, which must be loaded. **Compilation flags:** `static` **Template:** `decompile_predicate_indicators(CompiledPredicateIndicators,Entity,Type,PredicateIndicators)` **Mode and number of proofs:** `decompile_predicate_indicators(@list(predicate_indicator),-entity_identifier,-atom,-list(predicate_indicator))` - `zero_or_one` `decompile_predicate_indicators(@conjunction(predicate_indicator),-entity_identifier,-atom,-conjunction(predicate_indicator))` - `zero_or_one` `decompile_predicate_indicators(@predicate_indicator,-entity_identifier,-atom,-predicate_indicator)` - `zero_or_one` ------------------------------------------------------------------------ ###### `execution_context/7` Execution context term data. Execution context terms should be considered opaque terms subject to change without notice. **Compilation flags:** `static` **Template:** `execution_context(ExecutionContext,Entity,Sender,This,Self,MetaCallContext,CoinductionStack)` **Mode and number of proofs:** `execution_context(?nonvar,?entity_identifier,?object_identifier,?object_identifier,?object_identifier,@list(callable),@list(callable))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates ###### `active_debug_handler_/1` Current active debug handler provider. There is at most one active debug handler provider at any given moment. **Compilation flags:** `dynamic` **Template:** `active_debug_handler_(Provider)` **Mode and number of proofs:** `active_debug_handler_(?entity_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `monitoring` Event handlers protocol. The handlers are automatically called by the runtime for messages sent using the `::/2` control construct from objects or categories compiled with the `events` flag set to `allow`. **Availability:** `built_in` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2018-11-29 **Compilation flags:** `static,`` ``built_in` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `before/3` - `after/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `before/3` Event handler for `before` events. A `before` event handler may prevent a method from being looked up or called by failing. **Compilation flags:** `static` **Template:** `before(Object,Message,Sender)` **Mode and number of proofs:** `before(?term,?term,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `after/3` Event handler for `after` events. An `after` event handler may prevent a method from succeeding by failing. **Compilation flags:** `static` **Template:** `after(Object,Message,Sender)` **Mode and number of proofs:** `after(?term,?term,?term)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `user` Pseudo-object representing the plain Prolog database. Can be used as a monitor by defining `before/3` and `after/3` predicates. Can be used as a hook object by defining `term_expansion/2` and `goal_expansion/2` multifile and dynamic predicates. **Availability:** `built_in` **Author:** Paulo Moura **Version:** 1:6:0 **Date:** 2024-11-11 **Compilation flags:** `static,`` ``built_in,`` ``context_switching_calls,`` ``dynamic_declarations,`` ``threaded` **Implements:** `public` expanding `public` forwarding `public` monitoring **Uses:** user **Remarks:** (none) **Inherited public predicates:**  after/3  before/3  forward/1  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### coroutining") **object** #### `coroutining` Coroutining predicates. **Availability:** `logtalk_load(coroutining(loader))` **Author:** Paulo Moura **Version:** 0:5:0 **Date:** 2021-12-17 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Supported backend Prolog systems: ECLiPSe, SICStus Prolog, SWI-Prolog, Trealla Prolog, XVM, and YAP. **Inherited public predicates:** (none) - Public predicates - `dif/2` - `dif/1` - `freeze/2` - `frozen/2` - `when/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `dif/2` Sets a constraint that is true iff the two terms are different. **Compilation flags:** `static` **Template:** `dif(Term1,Term2)` **Mode and number of proofs:** `dif(+term,+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `dif/1` Sets a set of constraints that are true iff all terms in a list are different. **Compilation flags:** `static` **Template:** `dif(Terms)` **Mode and number of proofs:** `dif(+list(term))` - `zero_or_one` ------------------------------------------------------------------------ ###### `freeze/2` Delays the execution of a goal until a variable is bound. **Compilation flags:** `static` **Template:** `freeze(Variable,Goal)` **Meta-predicate template:** `freeze(*,0)` **Mode and number of proofs:** `freeze(+term,+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `frozen/2` Unifies `Goal` with the goal delayed by `Variable`. When no goals are frozen on `Variable`, `Goal` is unified with true. **Compilation flags:** `static` **Template:** `frozen(Variable,Goal)` **Mode and number of proofs:** `frozen(@var,--callable)` - `one` ------------------------------------------------------------------------ ###### `when/2` Calls `Goal` when `Condition` becomes true. The portable conditions are: `nonvar/1`, `ground/1`, `(,)/2`, and `(;)/2`. **Compilation flags:** `static` **Template:** `when(Condition,Goal)` **Meta-predicate template:** `when(*,0)` **Mode and number of proofs:** `when(+callable,+callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### crs_projections") **object** #### `crs_projections` Coordinate reference systems and common transformations for 2D and 3D WGS84 geodetic coordinates, Web Mercator, World Mercator, ECEF, local ENU tangent-plane, Lambert azimuthal equal-area, and UTM coordinates. **Availability:** `logtalk_load(crs_projections(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-10 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` crs_projections_protocol **Uses:** geospatial **Remarks:** > - Geographic coordinates: WGS84 coordinates are represented as `geographic(Latitude,Longitude)` in degrees. > > - 3D geodetic coordinates: WGS84 3D coordinates are represented as `geographic(Latitude,Longitude,EllipsoidalHeight)` using degrees for angular axes and meters for height. > > - Projected coordinates: Web Mercator, World Mercator, and Lambert azimuthal equal-area coordinates are represented as meter-based `projected(X,Y)` pairs. UTM coordinates are represented as `grid(Easting,Northing)` pairs. > > - Geocentric coordinates: ECEF coordinates are represented as `ecef(X,Y,Z)` triples in meters. > > - Local tangent-plane coordinates: ENU coordinates are represented as `enu(East,North,Up)` triples in meters relative to an origin coordinate. > > - UTM coverage: UTM helpers and transformations only succeed for latitudes in the `[-80.0,84.0[` range. **Inherited public predicates:**  crs_dimensions/2  crs_epsg/2  crs_kind/2  crs_name/2  crs_units/2  epsg_crs/2  lambert_azimuthal_equal_area/3  lambert_azimuthal_equal_area_inverse/3  local_tangent_plane/3  local_tangent_plane_inverse/3  transform/4  utm_crs/2  utm_zone/2  valid_coordinate/2  valid_crs/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crs_projections_protocol, geospatial **protocol** #### `crs_projections_protocol` Coordinate reference systems and coordinate transformation predicates protocol. **Availability:** `logtalk_load(crs_projections(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-10 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid_crs/1` - `crs_name/2` - `crs_kind/2` - `crs_units/2` - `crs_dimensions/2` - `crs_epsg/2` - `epsg_crs/2` - `valid_coordinate/2` - `local_tangent_plane/3` - `local_tangent_plane_inverse/3` - `lambert_azimuthal_equal_area/3` - `lambert_azimuthal_equal_area_inverse/3` - `utm_zone/2` - `utm_crs/2` - `transform/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_crs/1` True when the argument is a supported coordinate reference system. Supported values are `wgs84`, `wgs84_3d`, `web_mercator`, `world_mercator`, `ecef`, `enu(OriginCoordinate)`, `lambert_azimuthal_equal_area(OriginCoordinate)`, and `utm(Zone,Hemisphere)` terms. **Compilation flags:** `static` **Template:** `valid_crs(CRS)` **Mode and number of proofs:** `valid_crs(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `crs_name/2` Maps a supported coordinate reference system to a human-readable name. **Compilation flags:** `static` **Template:** `crs_name(CRS,Name)` **Mode and number of proofs:** `crs_name(+term,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `crs_kind/2` Classifies a supported coordinate reference system as `geographic`, `projected`, `geocentric`, or `local_tangent_plane`. **Compilation flags:** `static` **Template:** `crs_kind(CRS,Kind)` **Mode and number of proofs:** `crs_kind(+term,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `crs_units/2` Returns the coordinate axis units used by a supported coordinate reference system. Supported values are `degrees`, `meters`, and `[degrees,degrees,meters]`. **Compilation flags:** `static` **Template:** `crs_units(CRS,Units)` **Mode and number of proofs:** `crs_units(+term,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `crs_dimensions/2` Returns the coordinate dimensionality for a supported coordinate reference system. **Compilation flags:** `static` **Template:** `crs_dimensions(CRS,Dimensions)` **Mode and number of proofs:** `crs_dimensions(+term,-positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `crs_epsg/2` Maps a supported coordinate reference system to the corresponding EPSG code. **Compilation flags:** `static` **Template:** `crs_epsg(CRS,EPSG)` **Mode and number of proofs:** `crs_epsg(+term,-positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `epsg_crs/2` Maps a supported EPSG code to the corresponding coordinate reference system term. **Compilation flags:** `static` **Template:** `epsg_crs(EPSG,CRS)` **Mode and number of proofs:** `epsg_crs(+positive_integer,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_coordinate/2` True when the coordinate is valid for the given coordinate reference system. `wgs84` coordinates are represented as `geographic(Latitude,Longitude)` in degrees, `wgs84_3d` coordinates as `geographic(Latitude,Longitude,EllipsoidalHeight)` in degrees and meters, `web_mercator`, `world_mercator`, and `lambert_azimuthal_equal_area(OriginCoordinate)` coordinates as `projected(X,Y)` pairs in meters, `ecef` coordinates as `ecef(X,Y,Z)` triples in meters, `enu(OriginCoordinate)` coordinates as `enu(East,North,Up)` triples in meters, and `utm(Zone,Hemisphere)` coordinates as `grid(Easting,Northing)` pairs in meters. **Compilation flags:** `static` **Template:** `valid_coordinate(CRS,Coordinate)` **Mode and number of proofs:** `valid_coordinate(+term,@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `local_tangent_plane/3` Projects a WGS84 geographic coordinate to local `enu(East,North,Up)` coordinates in meters using an origin coordinate. For height-preserving 3D geodetic workflows, use `transform/4` with `wgs84_3d`. **Compilation flags:** `static` **Template:** `local_tangent_plane(Origin,Coordinate,LocalCoordinate)` **Mode and number of proofs:** `local_tangent_plane(+compound,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `local_tangent_plane_inverse/3` Converts local `enu(East,North,Up)` coordinates in meters back to a WGS84 geographic coordinate using an origin coordinate. For height-preserving 3D geodetic workflows, use `transform/4` with `wgs84_3d`. **Compilation flags:** `static` **Template:** `local_tangent_plane_inverse(Origin,LocalCoordinate,Coordinate)` **Mode and number of proofs:** `local_tangent_plane_inverse(+compound,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `lambert_azimuthal_equal_area/3` Projects a WGS84 geographic coordinate to a Lambert azimuthal equal-area plane centered on an origin coordinate, returning `projected(X,Y)` coordinates in meters. **Compilation flags:** `static` **Template:** `lambert_azimuthal_equal_area(Origin,Coordinate,ProjectedCoordinate)` **Mode and number of proofs:** `lambert_azimuthal_equal_area(+compound,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `lambert_azimuthal_equal_area_inverse/3` Converts Lambert azimuthal equal-area `projected(X,Y)` coordinates back to a WGS84 geographic coordinate using an origin coordinate. **Compilation flags:** `static` **Template:** `lambert_azimuthal_equal_area_inverse(Origin,ProjectedCoordinate,Coordinate)` **Mode and number of proofs:** `lambert_azimuthal_equal_area_inverse(+compound,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `utm_zone/2` Infers the UTM longitudinal zone for a WGS84 `geographic(Latitude,Longitude)` coordinate. Uses the standard Norway and Svalbard special-zone rules and only succeeds for coordinates within the UTM latitude coverage. **Compilation flags:** `static` **Template:** `utm_zone(Coordinate,Zone)` **Mode and number of proofs:** `utm_zone(+compound,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `utm_crs/2` Infers the native UTM coordinate reference system term `utm(Zone,Hemisphere)` for a WGS84 `geographic(Latitude,Longitude)` coordinate. **Compilation flags:** `static` **Template:** `utm_crs(Coordinate,CRS)` **Mode and number of proofs:** `utm_crs(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `transform/4` Transforms a coordinate between supported coordinate reference systems. Transformations between projected systems are computed by converting through `wgs84`. **Compilation flags:** `static` **Template:** `transform(SourceCRS,TargetCRS,Coordinate,TransformedCoordinate)` **Mode and number of proofs:** `transform(+term,+term,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also crs_projections, geospatial_protocol ### crypto") **object** #### `crypto` Transport-neutral cryptographic helper predicates. **Availability:** `logtalk_load(crypto(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-20 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** base64url_no_padding fast_random(Algorithm) hmac list md5 os type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `random_bytes/2` - `token_hex/2` - `token_urlsafe/2` - `random_below/2` - `hex_bytes/2` - `secure_compare/2` - `hkdf/5` - `pbkdf2/6` - `apr1/3` - `password_hash/4` - `password_hash_needs_rehash/3` - `verify_password_hash/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `random_bytes/2` Returns a list with the requested number of random bytes. It tries `/dev/urandom` first and falls back to a pseudo-random generator when necessary. **Compilation flags:** `static` **Template:** `random_bytes(Count,Bytes)` **Mode and number of proofs:** `random_bytes(+non_negative_integer,-list(byte))` - `one_or_error` **Exceptions:** `Count` is a variable: `instantiation_error` `Count` is neither a variable nor an integer: `type_error(integer,Count)` `Count` is an integer but is less than zero: `domain_error(non_negative_integer,Count)` ------------------------------------------------------------------------ ###### `token_hex/2` Returns a lowercase hexadecimal token generated from the requested number of random bytes. **Compilation flags:** `static` **Template:** `token_hex(Count,Token)` **Mode and number of proofs:** `token_hex(+non_negative_integer,-atom)` - `one_or_error` **Exceptions:** `Count` is a variable: `instantiation_error` `Count` is neither a variable nor an integer: `type_error(integer,Count)` `Count` is an integer but is less than zero: `domain_error(non_negative_integer,Count)` ------------------------------------------------------------------------ ###### `token_urlsafe/2` Returns an unpadded Base64URL token generated from the requested number of random bytes. **Compilation flags:** `static` **Template:** `token_urlsafe(Count,Token)` **Mode and number of proofs:** `token_urlsafe(+non_negative_integer,-atom)` - `one_or_error` **Exceptions:** `Count` is a variable: `instantiation_error` `Count` is neither a variable nor an integer: `type_error(integer,Count)` `Count` is an integer but is less than zero: `domain_error(non_negative_integer,Count)` ------------------------------------------------------------------------ ###### `random_below/2` Returns a uniformly distributed random integer greater than or equal to zero and less than the given exclusive upper bound. **Compilation flags:** `static` **Template:** `random_below(UpperBound,Integer)` **Mode and number of proofs:** `random_below(+positive_integer,-non_negative_integer)` - `one_or_error` **Exceptions:** `UpperBound` is a variable: `instantiation_error` `UpperBound` is neither a variable nor an integer: `type_error(integer,UpperBound)` `UpperBound` is an integer but is not positive: `domain_error(positive_integer,UpperBound)` ------------------------------------------------------------------------ ###### `hex_bytes/2` Relates a hexadecimal atom with the corresponding list of bytes, generating lowercase hexadecimal atoms when converting from bytes. **Compilation flags:** `static` **Template:** `hex_bytes(Hex,Bytes)` **Mode and number of proofs:** `hex_bytes(+atom,-list(byte))` - `zero_or_one_or_error` `hex_bytes(-atom,+list(byte))` - `zero_or_one_or_error` **Exceptions:** `Hex` and `Bytes` are both variables: `instantiation_error` `Hex` is neither a variable nor an atom: `type_error(atom,Hex)` `Hex` is an atom but not a valid hexadecimal atom: `domain_error(hexadecimal_atom,Hex)` `Bytes` is neither a variable nor a list of bytes: `type_error(list(byte),Bytes)` `Bytes` contains a variable byte: `instantiation_error` `Bytes` contains a non-integer byte: `type_error(integer,Byte)` `Bytes` contains an integer outside the byte range: `domain_error(byte,Byte)` ------------------------------------------------------------------------ ###### `secure_compare/2` Succeeds when both inputs are equal using a constant-time comparison strategy for byte sequences of the same representation. **Compilation flags:** `static` **Template:** `secure_compare(Expected,Candidate)` **Mode and number of proofs:** `secure_compare(+list(byte),+list(byte))` - `zero_or_one_or_error` `secure_compare(+atom,+atom)` - `zero_or_one_or_error` **Exceptions:** `Expected` is a partial list or a list with an element which is a variable: `instantiation_error` `Expected` is neither an atom nor a list of bytes: `type_error(list(byte),Expected)` `Expected` is an atom and `Candidate` is not an atom: `type_error(atom,Candidate)` `Candidate` is a partial list or a list with an element which is a variable: `instantiation_error` `Candidate` is neither an atom nor a list of bytes when `Expected` is a byte list: `type_error(list(byte),Candidate)` `Expected` or `Candidate` contains a non-integer byte: `type_error(integer,Byte)` `Expected` or `Candidate` contains an integer outside the byte range: `domain_error(byte,Byte)` ------------------------------------------------------------------------ ###### `hkdf/5` Derives a byte sequence of the requested length from input keying material using HKDF with a hash object implementing the `hash_digest_protocol` protocol. **Compilation flags:** `static` **Template:** `hkdf(Hash,KeyMaterial,Length,Bytes,Options)` **Mode and number of proofs:** `hkdf(+object_identifier,+list(byte),+non_negative_integer,-list(byte),+list(compound))` - `one_or_error` **Exceptions:** `Hash` is a variable: `instantiation_error` `Hash` is not an object implementing the `hash_digest_protocol` protocol: `domain_error(crypto_hash,Hash)` `KeyMaterial` is a partial list or a list with an element which is a variable: `instantiation_error` `KeyMaterial` is a list but not a list of bytes: `type_error(list(byte),KeyMaterial)` `KeyMaterial` contains a non-integer byte: `type_error(integer,Byte)` `KeyMaterial` contains an integer outside the byte range: `domain_error(byte,Byte)` `Length` is a variable: `instantiation_error` `Length` is neither a variable nor an integer: `type_error(integer,Length)` `Length` is less than zero: `domain_error(non_negative_integer,Length)` `Length` exceeds the maximum HKDF output length for the selected hash: `domain_error(hkdf_output_length(0,MaxLength),Length)` `Options` is a partial list or a list with an element which is a variable: `instantiation_error` `Options` is neither a variable nor a list of compound terms: `type_error(list(compound),Options)` `Options` contains an invalid option term: `domain_error(hkdf_option,Option)` `Options` contains a `salt/1` or `info/1` value that is not a list of bytes: `type_error(list(byte),Bytes)` `Options` contains a `salt/1` or `info/1` value with a variable byte: `instantiation_error` `Options` contains a `salt/1` or `info/1` value with a non-integer byte: `type_error(integer,Byte)` `Options` contains a `salt/1` or `info/1` value with an integer outside the byte range: `domain_error(byte,Byte)` **Remarks:** > - Repeated options: When the same HKDF option is given multiple times, the last occurrence is used. > > - Option `salt(Bytes)`: Uses the given byte list as the HKDF salt. When this option is absent, the salt defaults to a zero-filled byte list with the selected hash digest size. > > - Option `info(Bytes)`: Uses the given byte list as the HKDF context information. When this option is absent, the context information defaults to the empty list. ------------------------------------------------------------------------ ###### `pbkdf2/6` Derives a key from a password byte sequence and a salt using PBKDF2 with a hash object implementing the `hash_digest_protocol` protocol. **Compilation flags:** `static` **Template:** `pbkdf2(Hash,Password,Salt,Iterations,Length,DerivedKey)` **Mode and number of proofs:** `pbkdf2(+object_identifier,+list(byte),+list(byte),+integer,+non_negative_integer,-list(byte))` - `one_or_error` **Exceptions:** `Hash` is a variable: `instantiation_error` `Hash` is not an object implementing the `hash_digest_protocol` protocol: `domain_error(crypto_hash,Hash)` `Password` is a partial list or a list with an element which is a variable: `instantiation_error` `Password` is a list but not a list of bytes: `type_error(list(byte),Password)` `Password` contains a non-integer element: `type_error(integer,Byte)` `Password` contains an integer outside the byte range: `domain_error(byte,Byte)` `Salt` is a partial list or a list with an element which is a variable: `instantiation_error` `Salt` is a liust but not a list of bytes: `type_error(list(byte),Salt)` `Salt` contains a non-integer element: `type_error(integer,Byte)` `Salt` contains an integer outside the byte range: `domain_error(byte,Byte)` `Iterations` is a variable: `instantiation_error` `Iterations` is neither a variable nor an integer: `type_error(integer,Iterations)` `Iterations` is an integer but not a positive integer: `domain_error(positive_integer,Iterations)` `Length` is a variable: `instantiation_error` `Length` is neither a variable nor an integer: `type_error(integer,Length)` `Length` is an integer but is less than zero: `domain_error(non_negative_integer,Length)` `Length` exceeds the maximum PBKDF2 output length: `domain_error(pbkdf2_output_length,Length)` ------------------------------------------------------------------------ ###### `apr1/3` Computes the Apache APR1 encoded checksum for a password byte sequence and salt byte sequence. **Compilation flags:** `static` **Template:** `apr1(Password,Salt,Checksum)` **Mode and number of proofs:** `apr1(+list(byte),+list(byte),-list(byte))` - `one_or_error` **Exceptions:** `Password` is a partial list or a list with an element which is a variable: `instantiation_error` `Password` is a list but not a list of bytes: `type_error(list(byte),Password)` `Password` contains a non-integer element: `type_error(integer,Byte)` `Password` contains an integer outside the byte range: `domain_error(byte,Byte)` `Salt` is a partial list or a list with an element which is a variable: `instantiation_error` `Salt` is a list but not a list of bytes: `type_error(list(byte),Salt)` `Salt` contains a non-integer element: `type_error(integer,Byte)` `Salt` contains an integer outside the byte range: `domain_error(byte,Byte)` `Salt` is not a valid APR1 salt: `domain_error(apr1_salt,Salt)` ------------------------------------------------------------------------ ###### `password_hash/4` Computes a structured password-hash term using PBKDF2, a hash object implementing the `hash_digest_protocol` protocol, and the given derivation options. **Compilation flags:** `static` **Template:** `password_hash(Hash,Password,PasswordHash,Options)` **Mode and number of proofs:** `password_hash(+object_identifier,+list(byte),-compound,+list(compound))` - `one_or_error` **Exceptions:** `Hash` is a variable: `instantiation_error` `Hash` is not an object implementing the `hash_digest_protocol` protocol: `domain_error(crypto_hash,Hash)` `Password` is a partial list or a list with an element which is a variable: `instantiation_error` `Password` is a list but not a list of bytes: `type_error(list(byte),Password)` `Password` contains a non-integer element: `type_error(integer,Byte)` `Password` contains an integer outside the byte range: `domain_error(byte,Byte)` `Options` is a partial list or a list with an element which is a variable: `instantiation_error` `Options` is a list but not a list of compound terms: `type_error(list(compound),Options)` `Options` contains an invalid option term: `domain_error(password_hash_option,Option)` `Options` contains an `iterations/1` value that is not an integer: `type_error(integer,Iterations)` `Options` contains an `iterations/1` value that is not a positive integer: `domain_error(positive_integer,Iterations)` `Options` contains a `salt/1` value that is not a list of bytes: `type_error(list(byte),Salt)` `Options` contains a `salt/1` value with a variable byte: `instantiation_error` `Options` contains a `salt/1` value with a non-integer byte: `type_error(integer,Byte)` `Options` contains a `salt/1` value with an integer outside the byte range: `domain_error(byte,Byte)` `Options` contains a `salt_length/1` or `length/1` value that is not an integer: `type_error(integer,Length)` `Options` contains a `salt_length/1` or `length/1` value that is less than zero: `domain_error(non_negative_integer,Length)` **Remarks:** > - Repeated options: When the same password-hash option is given multiple times, the last occurrence is used. > > - Option `iterations(Count)`: Uses the given positive integer PBKDF2 iteration count. When this option is absent, the iteration count defaults to `131072`. > > - Option `salt(Bytes)`: Uses the given byte list as the PBKDF2 salt. When this option is present, no random salt is generated and any `salt_length/1` option only affects validation, not the selected salt value. > > - Option `salt_length(Count)`: Generates a random salt with the given non-negative number of bytes when `salt/1` is absent. When this option is absent, the generated salt length defaults to `16` bytes. > > - Option `length(Count)`: Uses the given non-negative derived-key length. When this option is absent, the derived-key length defaults to the selected hash digest size. ------------------------------------------------------------------------ ###### `password_hash_needs_rehash/3` Succeeds when the given password-hash term does not match the selected PBKDF2 password-hash policy. **Compilation flags:** `static` **Template:** `password_hash_needs_rehash(PasswordHash,Hash,Options)` **Mode and number of proofs:** `password_hash_needs_rehash(+compound,+object_identifier,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `PasswordHash` is not a supported password-hash term: `domain_error(password_hash,PasswordHash)` `PasswordHash` contains a variable hash object: `instantiation_error` `PasswordHash` contains a hash object that does not implement the `hash_digest_protocol` protocol: `domain_error(crypto_hash,Hash)` `PasswordHash` contains an `Iterations` value that is not an integer: `type_error(integer,Iterations)` `PasswordHash` contains an `Iterations` value that is not a positive integer: `domain_error(positive_integer,Iterations)` `PasswordHash` contains a `Salt`, `StoredKey`, `StoredDigest`, or `Checksum` value that is not a list of bytes: `type_error(list(byte),Bytes)` `PasswordHash` contains a `Salt`, `StoredKey`, `StoredDigest`, or `Checksum` value with a variable byte: `instantiation_error` `PasswordHash` contains a `Salt`, `StoredKey`, `StoredDigest`, or `Checksum` value with a non-integer byte: `type_error(integer,Byte)` `PasswordHash` contains a `Salt`, `StoredKey`, `StoredDigest`, or `Checksum` value with an integer outside the byte range: `domain_error(byte,Byte)` `PasswordHash` contains an invalid APR1 salt: `domain_error(apr1_salt,Salt)` `PasswordHash` contains an invalid APR1 checksum: `domain_error(apr1_checksum,Checksum)` `Hash` is a variable: `instantiation_error` `Hash` is not an object implementing the `hash_digest_protocol` protocol: `domain_error(crypto_hash,Hash)` `Options` is a partial list or a list with an element which is a variable: `instantiation_error` `Options` is a list but not a list of compound terms: `type_error(list(compound),Options)` `Options` contains an invalid option term: `domain_error(password_hash_option,Option)` `Options` contains an `iterations/1` value that is not an integer: `type_error(integer,Iterations)` `Options` contains an `iterations/1` value that is not a positive integer: `domain_error(positive_integer,Iterations)` `Options` contains a `salt/1` value that is not a list of bytes: `type_error(list(byte),Salt)` `Options` contains a `salt/1` value with a variable byte: `instantiation_error` `Options` contains a `salt/1` value with a non-integer byte: `type_error(integer,Byte)` `Options` contains a `salt/1` value with an integer outside the byte range: `domain_error(byte,Byte)` `Options` contains a `salt_length/1` or `length/1` value that is not an integer: `type_error(integer,Length)` `Options` contains a `salt_length/1` or `length/1` value that is less than zero: `domain_error(non_negative_integer,Length)` `Options` selects a `length/1` value that exceeds the maximum PBKDF2 output length: `domain_error(pbkdf2_output_length,Length)` **Remarks:** > - Policy: The `Hash` and `Options` arguments use the same policy options as `password_hash/4`. > > - Legacy hashes: Supported non-PBKDF2 password-hash terms need rehashing when valid. ------------------------------------------------------------------------ ###### `verify_password_hash/2` Succeeds when the password byte sequence matches the given structured password-hash term or stored digest term. **Compilation flags:** `static` **Template:** `verify_password_hash(PasswordHash,Password)` **Mode and number of proofs:** `verify_password_hash(+compound,+list(byte))` - `zero_or_one_or_error` **Exceptions:** `PasswordHash` is not a supported password-hash term: `domain_error(password_hash,PasswordHash)` `PasswordHash` contains a variable hash object: `instantiation_error` `PasswordHash` contains a hash object that does not implement the `hash_digest_protocol` protocol: `domain_error(crypto_hash,Hash)` `PasswordHash` contains an `Iterations` value that is not an integer: `type_error(integer,Iterations)` `PasswordHash` contains an `Iterations` value that is not a positive integer: `domain_error(positive_integer,Iterations)` `PasswordHash` contains a `Salt`, `StoredKey`, `StoredDigest`, or `Checksum` value that is not a list of bytes: `type_error(list(byte),Bytes)` `PasswordHash` contains a `Salt`, `StoredKey`, `StoredDigest`, or `Checksum` value with a variable byte: `instantiation_error` `PasswordHash` contains a `Salt`, `StoredKey`, `StoredDigest`, or `Checksum` value with a non-integer byte: `type_error(integer,Byte)` `PasswordHash` contains a `Salt`, `StoredKey`, `StoredDigest`, or `Checksum` value with an integer outside the byte range: `domain_error(byte,Byte)` `PasswordHash` contains an invalid APR1 salt: `domain_error(apr1_salt,Salt)` `PasswordHash` contains an invalid APR1 checksum: `domain_error(apr1_checksum,Checksum)` `Password` is a partial list or a list with an element which is a variable: `instantiation_error` `Password` is a list but not a list of bytes: `type_error(list(byte),Password)` `Password` contains a non-integer element: `type_error(integer,Byte)` `Password` contains an integer outside the byte range: `domain_error(byte,Byte)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### csv") **object** #### `csv` CSV files reading and writing predicates using the options Header - `keep`, Separator - `comma`, and IgnoreQuotes - `false`. **Availability:** `logtalk_load(csv(loader))` **Author:** Jacinto Dávila **Version:** 1:0:0 **Date:** 2021-02-02 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` csv(keep,comma,false,false) **Remarks:** (none) **Inherited public predicates:**  guess_arity/2  guess_separator/2  read_file/2  read_file/3  read_file_by_line/2  read_file_by_line/3  read_stream/2  read_stream/3  read_stream_by_line/2  read_stream_by_line/3  write_file/3  write_stream/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `csv(Header,Separator,IgnoreQuotes)` - `Header` - Header handling option with possible values `missing`, `skip`, and `keep` (default). - `Separator` - Separator handling option with possible values `comma` (default for non `.tsv` and non `.tab` files or when no file name extension is available), `tab` (default for `.tsv` and `.tab` files), `semicolon`, and `colon`. - `IgnoreQuotes` - Double-quotes handling option to ignore (`true`) or preserve (`false`; default) double quotes surrounding data. Backward-compatible parametric object equivalent to using `csv(_Header_,`` ``_Separator_,`` ``_IgnoreQuotes_,`` ``false)`. **Availability:** `logtalk_load(csv(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-02-27 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` csv(Header,Separator,IgnoreQuotes,false) **Remarks:** (none) **Inherited public predicates:**  guess_arity/2  guess_separator/2  read_file/2  read_file/3  read_file_by_line/2  read_file_by_line/3  read_stream/2  read_stream/3  read_stream_by_line/2  read_stream_by_line/3  write_file/3  write_stream/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `csv(Header,Separator,IgnoreQuotes,Comments)` - `Header` - Header handling option with possible values `missing`, `skip`, and `keep` (default). - `Separator` - Separator handling option with possible values `comma` (default for non `.tsv` and non `.tab` files or when no file name extension is available), `tab` (default for `.tsv` and `.tab` files), `semicolon`, and `colon`. - `IgnoreQuotes` - Double-quotes handling option to ignore (`true`) or preserve (`false`; default) double quotes surrounding data. - `Comments` - Comment handling option with possible values `true` and `false` (default). When `true`, lines starting with `#` are skipped when reading CSV files and streams. CSV file and stream reading and writing predicates. **Availability:** `logtalk_load(csv(loader))` **Author:** Jacinto Dávila and Paulo Moura **Version:** 2:2:0 **Date:** 2026-02-25 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` csv_protocol **Uses:** list logtalk os reader type **Remarks:** (none) **Inherited public predicates:**  guess_arity/2  guess_separator/2  read_file/2  read_file/3  read_file_by_line/2  read_file_by_line/3  read_stream/2  read_stream/3  read_stream_by_line/2  read_stream_by_line/3  write_file/3  write_stream/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `csv_guess_questions` Support for asking questions when guessing the separator and the record arity of CSV files. **Availability:** `logtalk_load(csv(loader))` **Author:** Jacinto Dávila **Version:** 1:0:0 **Date:** 2021-02-03 **Compilation flags:** `static` **Provides:** logtalk::message_tokens//2 logtalk::question_prompt_stream/4 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `csv_protocol` CSV file and stream reading and writing protocol. **Availability:** `logtalk_load(csv(loader))` **Author:** Jacinto Dávila and Paulo Moura **Version:** 2:0:1 **Date:** 2025-05-07 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Type-checking: Some of the predicate file and stream argument type-checking exceptions depend on the Prolog backend compliance with standards. **Inherited public predicates:** (none) - Public predicates - `read_file/3` - `read_stream/3` - `read_file/2` - `read_stream/2` - `read_file_by_line/3` - `read_stream_by_line/3` - `read_file_by_line/2` - `read_stream_by_line/2` - `write_file/3` - `write_stream/3` - `guess_separator/2` - `guess_arity/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `read_file/3` Reads a CSV file saving the data as clauses for the specified object predicate. Fails if the file cannot be parsed. **Compilation flags:** `static` **Template:** `read_file(File,Object,Predicate)` **Mode and number of proofs:** `read_file(+atom,+object_identifier,+predicate_indicator)` - `zero_or_one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be opened for reading: `permission_error(open,source_sink,File)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `read_stream/3` Reads a CSV stream saving the data as clauses for the specified object predicate. Fails if the stream cannot be parsed. **Compilation flags:** `static` **Template:** `read_stream(Stream,Object,Predicate)` **Mode and number of proofs:** `read_stream(+stream_or_alias,+object_identifier,+predicate_indicator)` - `zero_or_one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an output stream: `permission_error(input,stream,Stream)` `Stream` is a binary stream: `permission_error(input,binary_stream,Stream)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `read_file/2` Reads a CSV file returning the data as a list of rows, each row a list of fields. Fails if the file cannot be parsed. **Compilation flags:** `static` **Template:** `read_file(File,Rows)` **Mode and number of proofs:** `read_file(+atom,-list(list))` - `zero_or_one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be opened for reading: `permission_error(open,source_sink,File)` ------------------------------------------------------------------------ ###### `read_stream/2` Reads a CSV stream returning the data as a list of rows, each row a list of fields. Fails if the stream cannot be parsed. **Compilation flags:** `static` **Template:** `read_stream(Stream,Rows)` **Mode and number of proofs:** `read_stream(+stream_or_alias,-list(list))` - `zero_or_one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an output stream: `permission_error(input,stream,Stream)` `Stream` is a binary stream: `permission_error(input,binary_stream,Stream)` ------------------------------------------------------------------------ ###### `read_file_by_line/3` Reads a CSV file saving the data as clauses for the specified object predicate. The file is read line by line. Fails if the file cannot be parsed. **Compilation flags:** `static` **Template:** `read_file_by_line(File,Object,Predicate)` **Mode and number of proofs:** `read_file_by_line(+atom,+object_identifier,+predicate_indicator)` - `zero_or_one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be opened for reading: `permission_error(open,source_sink,File)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `read_stream_by_line/3` Reads a CSV stream saving the data as clauses for the specified object predicate. The stream is read line by line. Fails if the stream cannot be parsed. **Compilation flags:** `static` **Template:** `read_stream_by_line(Stream,Object,Predicate)` **Mode and number of proofs:** `read_stream_by_line(+stream_or_alias,+object_identifier,+predicate_indicator)` - `zero_or_one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an output stream: `permission_error(input,stream,Stream)` `Stream` is a binary stream: `permission_error(input,binary_stream,Stream)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `read_file_by_line/2` Reads a CSV file returning the data as a list of rows, each row a list of fields. The file is read line by line. Fails if the file cannot be parsed. **Compilation flags:** `static` **Template:** `read_file_by_line(File,Rows)` **Mode and number of proofs:** `read_file_by_line(+atom,-list(list))` - `zero_or_one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be opened for reading: `permission_error(open,source_sink,File)` ------------------------------------------------------------------------ ###### `read_stream_by_line/2` Reads a CSV stream returning the data as a list of rows, each row a list of fields. The stream is read line by line. Fails if the stream cannot be parsed. **Compilation flags:** `static` **Template:** `read_stream_by_line(Stream,Rows)` **Mode and number of proofs:** `read_stream_by_line(+stream_or_alias,-list(list))` - `zero_or_one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an output stream: `permission_error(input,stream,Stream)` `Stream` is a binary stream: `permission_error(input,binary_stream,Stream)` ------------------------------------------------------------------------ ###### `write_file/3` Writes a CSV file with the data represented by the solutions to the specified object predicate. **Compilation flags:** `static` **Template:** `write_file(File,Object,Predicate)` **Mode and number of proofs:** `write_file(+atom,+object_identifier,+predicate_indicator)` - `one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but cannot be opened for writing: `permission_error(open,source_sink,File)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `write_stream/3` Writes a CSV stream with the data represented by the solutions to the specified object predicate. **Compilation flags:** `static` **Template:** `write_stream(Stream,Object,Predicate)` **Mode and number of proofs:** `write_stream(+stream_or_alias,+object_identifier,+predicate_indicator)` - `one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an input stream: `permission_error(output,stream,Stream)` `Stream` is a binary stream: `permission_error(output,binary_stream,Stream)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `guess_separator/2` Guesses the separator used in a given file, asking the user to confirm. **Compilation flags:** `static` **Template:** `guess_separator(File,Separator)` **Mode and number of proofs:** `guess_separator(+atom,-atom)` - `one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an atom but cannot be opened for writing: `permission_error(open,source_sink,File)` ------------------------------------------------------------------------ ###### `guess_arity/2` Guesses the arity of records in a given file, asking the user to confirm. **Compilation flags:** `static` **Template:** `guess_arity(File,Arity)` **Mode and number of proofs:** `guess_arity(+atom,-number)` - `one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an atom but cannot be opened for writing: `permission_error(open,source_sink,File)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### cuid2") **object** #### `cuid2` Cuid2 generator using atom representation, 24 symbols, and a lowercase alphanumeric alphabet. **Availability:** `logtalk_load(cuid2(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` cuid2(atom,24,abcdefghijklmnopqrstuvwxyz0123456789) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also cuid2(Representation,Size,Alphabet), ids, ksuid, nanoid, snowflakeid, ulid, uuid **object** #### `cuid2(Representation,Size,Alphabet)` - `Representation` - Text representation for the Cuid2 identifier. Possible values are `atom`, `chars`, and `codes`. - `Size` - Number of symbols in the Cuid2 identifier. - `Alphabet` - Alphabet used for generating Cuid2 identifiers represented as an atom, list of characters, or list of character codes. Cuid2 generator. **Availability:** `logtalk_load(cuid2(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-01 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` cuid2_protocol **Uses:** crypto list **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also cuid2, ids(Representation,Bytes), ksuid(Representation,Alphabet), nanoid(Representation,Size,Alphabet), snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), ulid(Representation), uuid(Representation) **protocol** #### `cuid2_protocol` Cuid2 generator protocol. **Availability:** `logtalk_load(cuid2(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `generate/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `generate/1` Returns a Cuid2 identifier. **Compilation flags:** `static` **Template:** `generate(Cuid2)` **Mode and number of proofs:** `generate(--ground)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### cusum_anomaly_detector") **object** #### `cusum_anomaly_detector` CUSUM (Cumulative Sum Control Chart) anomaly detector for continuous sequence-like datasets. Learns per-step population mean and standard deviation from baseline training examples, or from the baseline subset of a labeled dataset selected by learn-time class-label options, using a dataset object implementing the `anomaly_dataset_protocol` protocol. Returns a detector term that can be used for scoring, prediction, and export. **Availability:** `logtalk_load(cusum_anomaly_detector(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` anomaly_detector_common **Uses:** format list pairs population type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  score/3  score_all/3  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_protocol, isolation_forest_anomaly_detector, knn_distance_anomaly_detector, lof_anomaly_detector, modified_z_score_anomaly_detector, z_score_anomaly_detector ### datalog") **object** #### `datalog` Portable Datalog engine with stratified negation and incremental updates. **Availability:** `logtalk_load(datalog(loader))` **Author:** Paulo Moura **Version:** 0:1:1 **Date:** 2026-03-30 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` datalog_protocol **Uses:** list numberlist type varlist **Remarks:** (none) **Inherited public predicates:**  add_rule/3  assert_fact/1  begin/0  clear/0  commit/0  explain/2  facts/1  load_program/1  materialize/0  predicate_stratum/3  query/1  query/2  remove_rule/1  retract_fact/1  rollback/0  rules/1  strata/1  update/3 - Public predicates - Protected predicates - Private predicates - `rule_/3` - `edb_fact_/1` - `idb_fact_/1` - `support_count_/2` - `support_edge_/3` - `predicate_stratum_/3` - `snapshot_/6` - `restore_snapshot/6` - `restore_edb_facts/1` - `restore_idb_facts/1` - `restore_support_counts/1` - `restore_support_edges/1` - `restore_predicate_strata/1` - `strata_from_numbers/2` - `predicates_in_stratum/2` - `has_aggregate_rules/0` - `aggregate_body_predicate/2` - `derive_aggregate_literal/2` - `derive_aggregate_goals/1` - `optimize_rule_body/2` - `partition_body_literals/5` - `literal_bucket/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `rule_/3` Table of loaded rules represented as rule id, head, and body literals. **Compilation flags:** `dynamic` **Template:** `rule_(Id,Head,Body)` **Mode and number of proofs:** `rule_(?nonvar,?callable,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `edb_fact_/1` Table of extensional database (EDB) facts. **Compilation flags:** `dynamic` **Template:** `edb_fact_(Fact)` **Mode and number of proofs:** `edb_fact_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `idb_fact_/1` Table of intensional database (IDB) currently derived facts. **Compilation flags:** `dynamic` **Template:** `idb_fact_(Fact)` **Mode and number of proofs:** `idb_fact_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `support_count_/2` Table of derivation support counts for currently derived facts. **Compilation flags:** `dynamic` **Template:** `support_count_(Fact,Count)` **Mode and number of proofs:** `support_count_(?callable,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `support_edge_/3` Table of concrete derivation edges as fact, rule id, and supporting literals. **Compilation flags:** `dynamic` **Template:** `support_edge_(Fact,RuleId,Supports)` **Mode and number of proofs:** `support_edge_(?callable,?nonvar,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `predicate_stratum_/3` Table of computed predicate strata represented as name, arity, and stratum number. **Compilation flags:** `dynamic` **Template:** `predicate_stratum_(Name,Arity,Stratum)` **Mode and number of proofs:** `predicate_stratum_(?atom,?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `snapshot_/6` Transaction snapshot of rules, EDB facts, IDB facts, support counts, support edges, and predicate strata. **Compilation flags:** `dynamic` **Template:** `snapshot_(Rules,EdbFacts,IdbFacts,SupportCounts,SupportEdges,PredicateStrata)` **Mode and number of proofs:** `snapshot_(?list,?list,?list,?list,?list,?list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `restore_snapshot/6` Restores a saved transaction snapshot into the current engine state. **Compilation flags:** `static` **Template:** `restore_snapshot(Rules,EdbFacts,IdbFacts,SupportCounts,SupportEdges,PredicateStrata)` **Mode and number of proofs:** `restore_snapshot(+list,+list,+list,+list,+list,+list)` - `one` ------------------------------------------------------------------------ ###### `restore_edb_facts/1` Restores EDB facts from a saved list. **Compilation flags:** `static` **Template:** `restore_edb_facts(Facts)` **Mode and number of proofs:** `restore_edb_facts(+list(callable))` - `one` ------------------------------------------------------------------------ ###### `restore_idb_facts/1` Restores IDB facts from a saved list. **Compilation flags:** `static` **Template:** `restore_idb_facts(Facts)` **Mode and number of proofs:** `restore_idb_facts(+list(callable))` - `one` ------------------------------------------------------------------------ ###### `restore_support_counts/1` Restores support counts from a saved list. **Compilation flags:** `static` **Template:** `restore_support_counts(Supports)` **Mode and number of proofs:** `restore_support_counts(+list)` - `one` ------------------------------------------------------------------------ ###### `restore_support_edges/1` Restores support edges from a saved list. **Compilation flags:** `static` **Template:** `restore_support_edges(Edges)` **Mode and number of proofs:** `restore_support_edges(+list)` - `one` ------------------------------------------------------------------------ ###### `restore_predicate_strata/1` Restores predicate strata from a saved list. **Compilation flags:** `static` **Template:** `restore_predicate_strata(Strata)` **Mode and number of proofs:** `restore_predicate_strata(+list)` - `one` ------------------------------------------------------------------------ ###### `strata_from_numbers/2` Builds grouped strata terms from a sorted list of stratum numbers. **Compilation flags:** `static` **Template:** `strata_from_numbers(StratumNumbers,Strata)` **Mode and number of proofs:** `strata_from_numbers(+list(integer),-list)` - `one` ------------------------------------------------------------------------ ###### `predicates_in_stratum/2` Returns predicates in a given stratum as sorted `predicate(Name,`` ``Arity)` terms. **Compilation flags:** `static` **Template:** `predicates_in_stratum(Stratum,Predicates)` **Mode and number of proofs:** `predicates_in_stratum(+integer,-list)` - `one` ------------------------------------------------------------------------ ###### `has_aggregate_rules/0` True when at least one loaded rule body contains an aggregate literal. **Compilation flags:** `static` **Mode and number of proofs:** `has_aggregate_rules` - `zero_or_one` ------------------------------------------------------------------------ ###### `aggregate_body_predicate/2` Enumerates predicate indicators referenced in aggregate goals from a body literal list. **Compilation flags:** `static` **Template:** `aggregate_body_predicate(Body,Predicate)` **Mode and number of proofs:** `aggregate_body_predicate(+list,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `derive_aggregate_literal/2` Evaluates an aggregate literal and returns a normalized support term. **Compilation flags:** `static` **Template:** `derive_aggregate_literal(AggregateLiteral,Support)` **Mode and number of proofs:** `derive_aggregate_literal(+compound,-nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `derive_aggregate_goals/1` Succeeds when all aggregate goals are true for the current bindings. **Compilation flags:** `static` **Template:** `derive_aggregate_goals(Goals)` **Mode and number of proofs:** `derive_aggregate_goals(+list(callable))` - `zero_or_one` ------------------------------------------------------------------------ ###### `optimize_rule_body/2` Normalizes a rule body by placing positive ground literals first, then positive non-ground literals, then aggregates, and finally negative literals. **Compilation flags:** `static` **Template:** `optimize_rule_body(Body,OptimizedBody)` **Mode and number of proofs:** `optimize_rule_body(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `partition_body_literals/5` Partitions body literals into positive-ground, positive-non-ground, aggregate, and negative lists preserving relative order. **Compilation flags:** `static` **Template:** `partition_body_literals(Body,PositiveGround,PositiveNonGround,Aggregates,Negatives)` **Mode and number of proofs:** `partition_body_literals(+list,-list,-list,-list,-list)` - `one` ------------------------------------------------------------------------ ###### `literal_bucket/2` Classifies a body literal into one of the normalization buckets. **Compilation flags:** `static` **Template:** `literal_bucket(Literal,Bucket)` **Mode and number of proofs:** `literal_bucket(+nonvar,-atom)` - `one` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `datalog_protocol` Datalog and incremental rule engine protocol (stratified negation subset). **Availability:** `logtalk_load(datalog(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2026-02-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Rules: Rules are represented as `rule(Id,`` ``Head,`` ``Body)` where `Body` is a list of literals using `Term` for positive, `neg(Term)` for negative, and `agg(Op,`` ``Template,`` ``Goals,`` ``Result)` for aggregates where `Op` is one of `count`, `sum`, `min`, or `max`. > > - Facts: EDB facts are represented by callable and ground terms. > > - Limitations: Current version requires aggregate dependencies to be in lower strata. **Inherited public predicates:** (none) - Public predicates - `clear/0` - `load_program/1` - `add_rule/3` - `remove_rule/1` - `begin/0` - `commit/0` - `rollback/0` - `assert_fact/1` - `retract_fact/1` - `materialize/0` - `update/3` - `query/1` - `query/2` - `explain/2` - `rules/1` - `facts/1` - `predicate_stratum/3` - `strata/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `clear/0` Clears all loaded rules, base facts, derived facts, and explanation supports. **Compilation flags:** `static` **Mode and number of proofs:** `clear` - `one` ------------------------------------------------------------------------ ###### `load_program/1` Loads a full program represented as a list of `rule(Id,Head,Body)` and `fact(Fact)` terms, replacing current engine state. **Compilation flags:** `static` **Template:** `load_program(Program)` **Mode and number of proofs:** `load_program(+list)` - `one` ------------------------------------------------------------------------ ###### `add_rule/3` Adds or replaces a rule. Rule safety is checked. **Compilation flags:** `static` **Template:** `add_rule(Id,Head,Body)` **Mode and number of proofs:** `add_rule(+nonvar,+callable,+list(callable))` - `one` ------------------------------------------------------------------------ ###### `remove_rule/1` Removes all rules matching a rule identifier. **Compilation flags:** `static` **Template:** `remove_rule(Id)` **Mode and number of proofs:** `remove_rule(+nonvar)` - `one` ------------------------------------------------------------------------ ###### `begin/0` Starts a transaction by saving the current engine state snapshot. **Compilation flags:** `static` **Mode and number of proofs:** `begin` - `one` ------------------------------------------------------------------------ ###### `commit/0` Commits a transaction by discarding the saved state snapshot. **Compilation flags:** `static` **Mode and number of proofs:** `commit` - `one` ------------------------------------------------------------------------ ###### `rollback/0` Rolls back a transaction by restoring the saved state snapshot. **Compilation flags:** `static` **Mode and number of proofs:** `rollback` - `one` ------------------------------------------------------------------------ ###### `assert_fact/1` Asserts a ground EDB fact if not already present. **Compilation flags:** `static` **Template:** `assert_fact(Fact)` **Mode and number of proofs:** `assert_fact(+callable)` - `one` ------------------------------------------------------------------------ ###### `retract_fact/1` Retracts an EDB fact if present. **Compilation flags:** `static` **Template:** `retract_fact(Fact)` **Mode and number of proofs:** `retract_fact(+callable)` - `one` ------------------------------------------------------------------------ ###### `materialize/0` Computes rule closure from current EDB facts and loaded rules using a fixpoint algorithm. **Compilation flags:** `static` **Mode and number of proofs:** `materialize` - `one` ------------------------------------------------------------------------ ###### `update/3` Applies incremental EDB updates and propagates derivation additions/removals; returns the resulting truth delta. **Compilation flags:** `static` **Template:** `update(Inserts,Deletes,Delta)` **Mode and number of proofs:** `update(+list(callable),+list(callable),-compound)` - `one` ------------------------------------------------------------------------ ###### `query/1` Enumerates currently true facts (EDB + IDB). **Compilation flags:** `static` **Template:** `query(Goal)` **Mode and number of proofs:** `query(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `query/2` Same as `query/1` while returning the unified goal as the second argument. **Compilation flags:** `static` **Template:** `query(Goal,Bindings)` **Mode and number of proofs:** `query(?callable,?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `explain/2` Returns one explanation for a currently true fact. **Compilation flags:** `static` **Template:** `explain(Fact,Explanation)` **Mode and number of proofs:** `explain(+callable,-nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ###### `rules/1` Returns the loaded rules. **Compilation flags:** `static` **Template:** `rules(Rules)` **Mode and number of proofs:** `rules(-list)` - `one` ------------------------------------------------------------------------ ###### `facts/1` Returns all currently true facts as a sorted list. **Compilation flags:** `static` **Template:** `facts(Facts)` **Mode and number of proofs:** `facts(-list(callable))` - `one` ------------------------------------------------------------------------ ###### `predicate_stratum/3` Enumerates predicate strata as functor, arity, and stratum number. **Compilation flags:** `static` **Template:** `predicate_stratum(Functor,Arity,Stratum)` **Mode and number of proofs:** `predicate_stratum(?atom,?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `strata/1` Returns all strata grouped by stratum number and contained predicates. **Compilation flags:** `static` **Template:** `strata(Strata)` **Mode and number of proofs:** `strata(-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### dates") **object** #### `date` Date predicates. **Availability:** `logtalk_load(dates(loader))` **Author:** Paulo Moura **Version:** 2:3:0 **Date:** 2026-04-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` datep **Uses:** list os **Remarks:** (none) **Inherited public predicates:**  add_duration/3  after/2  before/2  compare_date_time/3  date_time_to_unix/2  day_of_year/2  day_of_year_date/3  days_in_month/3  duration_between/3  format_date_time/4  leap_year/1  local_to_utc/3  month_weekday_date/5  name_of_day/3  name_of_month/3  normalize_date_time/2  same_instant/2  subtract_duration/3  today/3  unix_to_date_time/2  utc_to_local/3  valid/3  valid_date_time/1  week_of_year_iso/2  weekday/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `datep` Date protocol. **Availability:** `logtalk_load(dates(loader))` **Author:** Paulo Moura **Version:** 2:3:0 **Date:** 2026-04-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `today/3` - `leap_year/1` - `name_of_day/3` - `name_of_month/3` - `days_in_month/3` - `valid/3` - `date_time_to_unix/2` - `unix_to_date_time/2` - `add_duration/3` - `subtract_duration/3` - `duration_between/3` - `utc_to_local/3` - `local_to_utc/3` - `format_date_time/4` - `day_of_year/2` - `day_of_year_date/3` - `month_weekday_date/5` - `week_of_year_iso/2` - `weekday/2` - `normalize_date_time/2` - `valid_date_time/1` - `before/2` - `after/2` - `same_instant/2` - `compare_date_time/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `today/3` Returns current date. **Compilation flags:** `static` **Template:** `today(Year,Month,Day)` **Mode and number of proofs:** `today(-integer,-integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `leap_year/1` True if the argument is a leap year. **Compilation flags:** `static` **Template:** `leap_year(Year)` **Mode and number of proofs:** `leap_year(+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `name_of_day/3` Name and short name of day using ISO weekday numbering (Monday=1, …, Sunday=7). **Compilation flags:** `static` **Template:** `name_of_day(Index,Name,Short)` **Mode and number of proofs:** `name_of_day(?integer,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `name_of_month/3` Name and short name of month. **Compilation flags:** `static` **Template:** `name_of_month(Index,Name,Short)` **Mode and number of proofs:** `name_of_month(?integer,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `days_in_month/3` Number of days in a month. **Compilation flags:** `static` **Template:** `days_in_month(Month,Year,Days)` **Mode and number of proofs:** `days_in_month(?integer,+integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `valid/3` True if the arguments represent a valid date. **Compilation flags:** `static` **Template:** `valid(Year,Month,Day)` **Mode and number of proofs:** `valid(@integer,@integer,@integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `date_time_to_unix/2` Converts a UTC date-time term `date_time(Year,Month,Day,Hours,Minutes,Seconds)` to Unix epoch seconds. **Compilation flags:** `static` **Template:** `date_time_to_unix(DateTime,UnixTime)` **Mode and number of proofs:** `date_time_to_unix(+compound,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `unix_to_date_time/2` Converts Unix epoch seconds to a UTC date-time term `date_time(Year,Month,Day,Hours,Minutes,Seconds)`. **Compilation flags:** `static` **Template:** `unix_to_date_time(UnixTime,DateTime)` **Mode and number of proofs:** `unix_to_date_time(+integer,-compound)` - `one` ------------------------------------------------------------------------ ###### `add_duration/3` Adds a duration to a datetime. Duration can be integer seconds, `duration(Days,Hours,Minutes,Seconds)`, or a calendar-aware `duration(Years,Months,Days,Hours,Minutes,Seconds)`. For the 6-arity form, the year and month delta is applied first using calendar arithmetic, clamping the day to the last valid day of the resulting month when necessary (e.g. January 31 plus one month gives February 28 or 29), and the remaining day and time delta is then applied via fixed-length arithmetic. **Compilation flags:** `static` **Template:** `add_duration(DateTime,Duration,ResultDateTime)` **Mode and number of proofs:** `add_duration(+compound,+nonvar,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `subtract_duration/3` Subtracts a duration from a datetime. Duration can be integer seconds, `duration(Days,Hours,Minutes,Seconds)`, or a calendar-aware `duration(Years,Months,Days,Hours,Minutes,Seconds)`. For the 6-arity form, the year and month delta is subtracted first using calendar arithmetic with end-of-month day clamping, and the remaining day and time delta is then subtracted via fixed-length arithmetic. **Compilation flags:** `static` **Template:** `subtract_duration(DateTime,Duration,ResultDateTime)` **Mode and number of proofs:** `subtract_duration(+compound,+nonvar,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `duration_between/3` Computes the difference between two datetimes as integer seconds, as `duration(Days,Hours,Minutes,Seconds)`, or as a calendar-aware `duration(Years,Months,Days,Hours,Minutes,Seconds)`. For the 6-arity form, the year and month components count the largest whole number of calendar months between the two datetimes (consistent with the day-clamping semantics of `add_duration/3`), and the remaining days and time fields are the exact residual. For backward intervals all fields are negative. **Compilation flags:** `static` **Template:** `duration_between(StartDateTime,EndDateTime,Duration)` **Mode and number of proofs:** `duration_between(+compound,+compound,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `utc_to_local/3` Converts a UTC datetime to a local datetime using an explicit timezone offset atom (`Z` or `±HH:MM`). **Compilation flags:** `static` **Template:** `utc_to_local(UTCDateTime,Offset,LocalDateTime)` **Mode and number of proofs:** `utc_to_local(+compound,+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `local_to_utc/3` Converts a local datetime to UTC using an explicit timezone offset atom (`Z` or `±HH:MM`). **Compilation flags:** `static` **Template:** `local_to_utc(LocalDateTime,Offset,UTCDateTime)` **Mode and number of proofs:** `local_to_utc(+compound,+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `format_date_time/4` Formats a date-time using an explicit UTC offset in seconds. Supported format identifiers are `rfc3339`, `iso8601`, `atom`, `rfc2822`, `rfc5322`, `rss`, `http_date`, `rfc1123`, `unix_date`, `common_log`, `date_short`, `date_medium`, `date_long`, `date_full`, `time_short`, `time_medium`, `time_long`, `time_full`, `date_time_short`, `date_time_medium`, `date_time_long`, and `date_time_full`. RFC 3339, ISO 8601, Atom, and the `date_*` and `date_time_*` styles require a four-digit non-negative year. Formats that include numeric offsets require an offset expressible in whole minutes. HTTP-date and RFC 1123 output are always normalized to GMT. The style presets are English-only presentation formats. Fails if the format or date-time are not valid. **Compilation flags:** `static` **Template:** `format_date_time(DateTime,OffsetSeconds,Format,String)` **Mode and number of proofs:** `format_date_time(+compound,+integer,+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `day_of_year/2` Computes the day of year (1-366) for a `date(Year,Month,Day)` or `date_time(...)` term. **Compilation flags:** `static` **Template:** `day_of_year(DateLike,DayOfYear)` **Mode and number of proofs:** `day_of_year(+compound,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `day_of_year_date/3` Computes the calendar date corresponding to a year and day of year (1-366) as `date(Year,Month,Day)`. **Compilation flags:** `static` **Template:** `day_of_year_date(Year,DayOfYear,Date)` **Mode and number of proofs:** `day_of_year_date(+integer,+integer,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `month_weekday_date/5` Computes the calendar date for the nth or last weekday in a month as `date(Year,Month,Day)`. Week values 1-4 select the nth weekday and week value 5 selects the last one. Weekday uses ISO numbering (Monday=1, …, Sunday=7). **Compilation flags:** `static` **Template:** `month_weekday_date(Year,Month,Week,Weekday,Date)` **Mode and number of proofs:** `month_weekday_date(+integer,+integer,+integer,+integer,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `week_of_year_iso/2` Computes ISO week for a `date(Year,Month,Day)` or `date_time(...)` term as `week(Week,Year)`. **Compilation flags:** `static` **Template:** `week_of_year_iso(DateLike,ISOWeek)` **Mode and number of proofs:** `week_of_year_iso(+compound,?compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `weekday/2` Computes ISO weekday number (Monday=1, …, Sunday=7) for a `date(Year,Month,Day)` or `date_time(...)` term. **Compilation flags:** `static` **Template:** `weekday(DateLike,Weekday)` **Mode and number of proofs:** `weekday(+compound,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `normalize_date_time/2` Normalizes a datetime term by carrying overflows/underflows in date and time fields. **Compilation flags:** `static` **Template:** `normalize_date_time(DateTime,NormalizedDateTime)` **Mode and number of proofs:** `normalize_date_time(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `valid_date_time/1` True iff a datetime term is valid in strict mode. **Compilation flags:** `static` **Template:** `valid_date_time(DateTime)` **Mode and number of proofs:** `valid_date_time(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `before/2` True iff `DateTime1` represents an instant strictly before `DateTime2`. **Compilation flags:** `static` **Template:** `before(DateTime1,DateTime2)` **Mode and number of proofs:** `before(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `after/2` True iff `DateTime1` represents an instant strictly after `DateTime2`. **Compilation flags:** `static` **Template:** `after(DateTime1,DateTime2)` **Mode and number of proofs:** `after(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `same_instant/2` True iff `DateTime1` and `DateTime2` represent the same instant (equal Unix epoch seconds). **Compilation flags:** `static` **Template:** `same_instant(DateTime1,DateTime2)` **Mode and number of proofs:** `same_instant(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `compare_date_time/3` Three-way comparison of two datetime terms. `Order` is unified with `<`, `=`, or `>`. Suitable for use with `sort/3`. **Compilation flags:** `static` **Template:** `compare_date_time(Order,DateTime1,DateTime2)` **Mode and number of proofs:** `compare_date_time(?atom,+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also date, timep **object** #### `time` Time predicates. **Availability:** `logtalk_load(dates(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2014-09-27 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` timep **Uses:** os **Remarks:** (none) **Inherited public predicates:**  cpu_time/1  now/3  valid/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also datep **protocol** #### `timep` Time protocol. **Availability:** `logtalk_load(dates(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2000-07-24 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `now/3` - `cpu_time/1` - `valid/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `now/3` Returns current time. **Compilation flags:** `static` **Template:** `now(Hours,Mins,Secs)` **Mode and number of proofs:** `now(-integer,-integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `cpu_time/1` Returns the current cpu time. **Compilation flags:** `static` **Template:** `cpu_time(Time)` **Mode and number of proofs:** `cpu_time(-number)` - `one` ------------------------------------------------------------------------ ###### `valid/3` True if the arguments represent a valid time value. **Compilation flags:** `static` **Template:** `valid(Hours,Mins,Secs)` **Mode and number of proofs:** `valid(+integer,+integer,+integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also time, datep ### dates_tz") **object** #### `dates_tz` Zone-aware date-time conversion bridging the `dates` and `tzif` libraries. **Availability:** `logtalk_load(dates_tz(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` dates_tz_protocol **Uses:** date tzif **Remarks:** (none) **Inherited public predicates:**  convert_zones/4  convert_zones_with_resolution/5  local_to_utc_tz/3  local_to_utc_tz_with_resolution/4  utc_to_local_tz/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dates_tz_protocol, date, tzif **protocol** #### `dates_tz_protocol` Protocol for zone-aware date-time conversion using cached TZif data. **Availability:** `logtalk_load(dates_tz(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-14 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `utc_to_local_tz/3` - `local_to_utc_tz/3` - `local_to_utc_tz_with_resolution/4` - `convert_zones/4` - `convert_zones_with_resolution/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `utc_to_local_tz/3` Converts a UTC date-time to the civil local date-time in the named zone. Requires the zone to be present in the cached TZif data. **Compilation flags:** `static` **Template:** `utc_to_local_tz(UTCDateTime,Zone,LocalDateTime)` **Mode and number of proofs:** `utc_to_local_tz(+compound,+atom,-compound)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif data: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_to_utc_tz/3` Converts a civil local date-time in the named zone to UTC. This strict variant fails silently if the local time falls in a DST gap (non-existent time) or a DST fold (ambiguous time). Requires the zone to be present in the cached TZif data. **Compilation flags:** `static` **Template:** `local_to_utc_tz(LocalDateTime,Zone,UTCDateTime)` **Mode and number of proofs:** `local_to_utc_tz(+compound,+atom,-compound)` - `zero_or_one_or_error` **Exceptions:** `LocalDateTime` is a variable: `instantiation_error` `LocalDateTime` is neither a variable nor a valid `date_time/6` term: `type_error(date_time,LocalDateTime)` `Zone` is not present in the cached TZif data: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_to_utc_tz_with_resolution/4` Converts a civil local date-time in the named zone to UTC using an explicit resolution mode for ambiguous or non-existent times. The resolution mode can be `strict` (fail unless exactly one interpretation), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), or `all` (enumerate all valid interpretations). Requires the zone to be present in the cached TZif data. **Compilation flags:** `static` **Template:** `local_to_utc_tz_with_resolution(LocalDateTime,Zone,ResolutionMode,UTCDateTime)` **Mode and number of proofs:** `local_to_utc_tz_with_resolution(+compound,+atom,+atom,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `convert_zones/4` Converts a civil local date-time in one zone to the civil local date-time in another zone. Uses strict interpretation: fails if the source local time is in a DST gap or fold. Requires both zones to be present in the cached TZif data. **Compilation flags:** `static` **Template:** `convert_zones(LocalDateTime,FromZone,ToZone,ResultDateTime)` **Mode and number of proofs:** `convert_zones(+compound,+atom,+atom,-compound)` - `zero_or_one_or_error` **Exceptions:** `LocalDateTime` is a variable: `instantiation_error` `LocalDateTime` is neither a variable nor a valid `date_time/6` term: `type_error(date_time,LocalDateTime)` `FromZone` is not present in the cached TZif data: `existence_error(time_zone,FromZone)` `ToZone` is not present in the cached TZif data: `existence_error(time_zone,ToZone)` ------------------------------------------------------------------------ ###### `convert_zones_with_resolution/5` Converts a civil local date-time in one zone to the civil local date-time in another zone using an explicit resolution mode for the source zone. The resolution mode is applied when the source local time is ambiguous or non-existent. Requires both zones to be present in the cached TZif data. **Compilation flags:** `static` **Template:** `convert_zones_with_resolution(LocalDateTime,FromZone,ResolutionMode,ToZone,ResultDateTime)` **Mode and number of proofs:** `convert_zones_with_resolution(+compound,+atom,+atom,+atom,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also dates_tz ### dbscan_clusterer") **object** #### `dbscan_clusterer` DBSCAN clusterer for continuous datasets. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(dbscan_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common `public` search_indexing **Uses:** avltree deque format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, kcenters_clusterer, kmeans_clusterer, kmedoids_clusterer, kmedians_clusterer ### dead_code_scanner") **object** #### `dead_code_scanner` A tool for detecting *likely* dead code in compiled Logtalk entities and Prolog modules compiled as objects. **Availability:** `logtalk_load(dead_code_scanner(loader))` **Author:** Barry Evans and Paulo Moura **Version:** 0:18:2 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` tool_diagnostics_common `public` options **Uses:** list logtalk os term_io type user **Remarks:** > - Dead code: A predicate or non-terminal that is not called (directly or indirectly) by any scoped predicate or non-terminal. These predicates and non-terminals are not used, cannot be called without breaking encapsulation, and are thus considered dead code. > > - Diagnostics targets: The diagnostics predicates accept the targets `all`, `entity(Entity)`, `file(File)`, `directory(Directory)`, `rdirectory(Directory)`, `library(Library)`, and `rlibrary(Library)`. The `entity(Entity)` target requires a loaded object or category. The `file(File)` target accepts a loaded source file specified by name, basename, full path, or library notation. Directory and library targets restrict diagnostics to loaded files found in the given directory, recursively in its sub-directories, in the given library, or recursively in its sub-libraries. > > - Known issues: Use of local meta-calls with goal arguments only know at runtime can result in false positives. Calls from non-standard meta-predicates may be missed if the meta-calls are not optimized. > > - Requirements: Source files must be compiled with the `source_data` flag turned on. To avoid false positives do to meta-calls, compilation of source files with the `optimized` flag turned on is also advised. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostic/3  diagnostic_rule/5  diagnostic_rules/1  diagnostic_target/1  diagnostics/2  diagnostics/3  diagnostics_preflight/2  diagnostics_preflight/3  diagnostics_summary/2  diagnostics_summary/3  diagnostics_tool/5  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `entity/1` - `entity/2` - `file/2` - `file/1` - `directory/2` - `directory/1` - `rdirectory/2` - `rdirectory/1` - `library/2` - `library/1` - `rlibrary/2` - `rlibrary/1` - `all/1` - `all/0` - `predicates/2` - `predicates/3` - `predicate/2` - `predicate/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `entity/1` Scans a loaded entity for dead code. Fails if the entity does not exist. **Compilation flags:** `static` **Template:** `entity(Entity)` **Mode and number of proofs:** `entity(+entity_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity/2` Scans a loaded entity for dead code using the given options. Fails if the entity does not exist. **Compilation flags:** `static` **Template:** `entity(Entity,Options)` **Mode and number of proofs:** `entity(+entity_identifier,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `file/2` Scans all entities in a loaded source file for dead code using the given options. The file can be given by name, basename, full path, or using library notation. Fails if the file is not loaded. **Compilation flags:** `static` **Template:** `file(File,Options)` **Mode and number of proofs:** `file(+atom,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `file/1` Scans all entities in a loaded source file for dead code using default options. The file can be given by name, basename, full path, or using library notation. Fails if the file is not loaded. **Compilation flags:** `static` **Template:** `file(File)` **Mode and number of proofs:** `file(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `directory/2` Scans all entities in all loaded files from a given directory for dead code using the given options. **Compilation flags:** `static` **Template:** `directory(Directory,Options)` **Mode and number of proofs:** `directory(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `directory/1` Scans all entities in all loaded files from a given directory for dead code using default options. **Compilation flags:** `static` **Template:** `directory(Directory)` **Mode and number of proofs:** `directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `rdirectory/2` Scans all entities in all loaded files from a given directory and its sub-directories for dead code using the given options. **Compilation flags:** `static` **Template:** `rdirectory(Directory,Options)` **Mode and number of proofs:** `rdirectory(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rdirectory/1` Scans all entities in all loaded files from a given directory and its sub-directories for dead code using default options. **Compilation flags:** `static` **Template:** `rdirectory(Directory)` **Mode and number of proofs:** `rdirectory(+atom)` - `one` ------------------------------------------------------------------------ ###### `library/2` Scans all entities in all loaded files from a given library for dead code using the given options. **Compilation flags:** `static` **Template:** `library(Library,Options)` **Mode and number of proofs:** `library(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `library/1` Scans all entities in all loaded files from a given library for dead code using default options. **Compilation flags:** `static` **Template:** `library(Library)` **Mode and number of proofs:** `library(+atom)` - `one` ------------------------------------------------------------------------ ###### `rlibrary/2` Scans all entities in all loaded files in a loaded library and its sub-libraries for dead code using the given options. **Compilation flags:** `static` **Template:** `rlibrary(Library,Options)` **Mode and number of proofs:** `rlibrary(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rlibrary/1` Scans all entities in all loaded files in a loaded library and its sub-libraries for dead code using default options. **Compilation flags:** `static` **Template:** `rlibrary(Library)` **Mode and number of proofs:** `rlibrary(+atom)` - `one` ------------------------------------------------------------------------ ###### `all/1` Scans all entities for dead code using the given options. **Compilation flags:** `static` **Template:** `all(Options)` **Mode and number of proofs:** `all(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `all/0` Scans all entities for dead code using default options. **Compilation flags:** `static` **Mode and number of proofs:** `all` - `one` ------------------------------------------------------------------------ ###### `predicates/2` Returns an ordered set of local predicates (and non-terminals) that are not used, directly or indirectly, by scoped predicates for a loaded entity. **Compilation flags:** `static` **Template:** `predicates(Entity,Predicates)` **Mode and number of proofs:** `predicates(+entity_identifier,-list(predicate_indicator))` - `one` ------------------------------------------------------------------------ ###### `predicates/3` Returns an ordered set of local predicates (and non-terminals) that are not used, directly or indirectly, by scoped predicates for a loaded entity using the given options. **Compilation flags:** `static` **Template:** `predicates(Entity,Predicates,Options)` **Mode and number of proofs:** `predicates(+entity_identifier,-list(predicate_indicator),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `predicate/2` Enumerates, by backtracking, local predicates (and non-terminals) that are not used, directly or indirectly, by scoped predicates for a loaded entity. **Compilation flags:** `static` **Template:** `predicate(Entity,Predicate)` **Mode and number of proofs:** `predicate(+entity_identifier,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `predicate/3` Enumerates, by backtracking, local predicates (and non-terminals) that are not used, directly or indirectly, by scoped predicates for a loaded entity using the given options. **Compilation flags:** `static` **Template:** `predicate(Entity,Predicate,Options)` **Mode and number of proofs:** `predicate(+entity_identifier,?predicate_indicator,+list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `dead_code_scanner_messages` Logtalk `dead_code_scanner` tool default message translations. **Availability:** `logtalk_load(dead_code_scanner(loader))` **Author:** Barry Evans and Paulo Moura **Version:** 0:9:1 **Date:** 2026-05-05 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### debug_messages") **object** #### `debug_messages` Supports selective enabling and disabling of `debug` and `debug(Group)` messages. **Availability:** `logtalk_load(debug_messages(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2022-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk **Remarks:** > - Limitations: Debug messages are suppressed by the compiler when the `optimize` flag is turned on and thus cannot be enabled in this case. **Inherited public predicates:** (none) - Public predicates - `enable/1` - `disable/1` - `enabled/1` - `enable/2` - `disable/2` - `enabled/2` - Protected predicates - Private predicates - `enabled_/1` - `enabled_/2` - Operators ##### Public predicates ###### `enable/1` Enables all `debug` and `debug(Group)` messages for the given component. **Compilation flags:** `static` **Template:** `enable(Component)` **Mode and number of proofs:** `enable(@term)` - `one` ------------------------------------------------------------------------ ###### `disable/1` Disables all `debug` and `debug(Group)` messages for the given component. **Compilation flags:** `static` **Template:** `disable(Component)` **Mode and number of proofs:** `disable(@term)` - `one` ------------------------------------------------------------------------ ###### `enabled/1` Enumerates by backtracking the components with enabled `debug` and `debug(Group)` messages. **Compilation flags:** `static` **Template:** `enabled(Component)` **Mode and number of proofs:** `enabled(?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `enable/2` Enables `debug(Group)` messages for the given component and group. **Compilation flags:** `static` **Template:** `enable(Component,Group)` **Mode and number of proofs:** `enable(@term,@term)` - `one` ------------------------------------------------------------------------ ###### `disable/2` Disables `debug(Group)` messages for the given component and group. **Compilation flags:** `static` **Template:** `disable(Component,Group)` **Mode and number of proofs:** `disable(@term,@term)` - `one` ------------------------------------------------------------------------ ###### `enabled/2` Enumerates by backtracking the enabled `debug(Group)` messages for each component. **Compilation flags:** `static` **Template:** `enabled(Component,Group)` **Mode and number of proofs:** `enabled(?term,?term)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `enabled_/1` Table of components with currently enabled `debug` and `debug(Group)` messages. **Compilation flags:** `dynamic` **Template:** `enabled_(Component)` **Mode and number of proofs:** `enabled_(?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `enabled_/2` Table of currently enabled `debug(Group)` per component. **Compilation flags:** `dynamic` **Template:** `enabled_(Component,Group)` **Mode and number of proofs:** `enabled_(?term,?term)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### debugger") **object** #### `debugger` Command-line debugger based on an extended procedure box model supporting execution tracing and spy points. **Availability:** `logtalk_load(debugger(loader))` **Author:** Paulo Moura **Version:** 8:0:1 **Date:** 2026-02-07 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` debuggerp **Provides:** logtalk::debug_handler/1 logtalk::debug_handler/3 **Uses:** logtalk **Remarks:** (none) **Inherited public predicates:**  debug/0  debugging/0  debugging/1  leash/1  leashing/1  log/3  logging/3  nodebug/0  nolog/3  nologall/0  nospy/1  nospy/3  nospy/4  nospyall/0  notrace/0  reset/0  set_write_max_depth/1  spy/1  spy/3  spy/4  spying/1  spying/3  spying/4  trace/0  write_max_depth/1 - Public predicates - Protected predicates - Private predicates - `debugging_/0` - `tracing_/0` - `explicit_tracing_/0` - `skipping_/0` - `skipping_unleashed_/1` - `quasi_skipping_/0` - `leaping_/1` - `leashing_/1` - `invocation_number_/1` - `jump_to_invocation_number_/1` - `zap_to_port_/1` - `write_max_depth_/1` - `log_point_/3` - `clause_breakpoint_/2` - `predicate_breakpoint_/3` - `entity_predicate_breakpoint_/4` - `context_breakpoint_/4` - `conditional_breakpoint_/3` - `triggered_breakpoint_/4` - `triggered_breakpoint_enabled_/2` - `file_line_hit_count_/3` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `debugging_/0` True iff debug is on. **Compilation flags:** `dynamic` **Mode and number of proofs:** `debugging_` - `zero_or_one` ------------------------------------------------------------------------ ###### `tracing_/0` True iff tracing is on. **Compilation flags:** `dynamic` **Mode and number of proofs:** `tracing_` - `zero_or_one` ------------------------------------------------------------------------ ###### `explicit_tracing_/0` True iff tracing is on due to a call to the trace/0 predicate. **Compilation flags:** `dynamic` **Mode and number of proofs:** `explicit_tracing_` - `zero_or_one` ------------------------------------------------------------------------ ###### `skipping_/0` True iff skipping. **Compilation flags:** `dynamic` **Mode and number of proofs:** `skipping_` - `zero_or_one` ------------------------------------------------------------------------ ###### `skipping_unleashed_/1` True iff skipping (a goal with invocation number `N`) but showing intermediate ports as unleashed. **Compilation flags:** `dynamic` **Template:** `skipping_unleashed_(N)` **Mode and number of proofs:** `skipping_unleashed_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `quasi_skipping_/0` True iff quasi-skipping. **Compilation flags:** `dynamic` **Mode and number of proofs:** `quasi_skipping_` - `zero_or_one` ------------------------------------------------------------------------ ###### `leaping_/1` True iff leaping in tracing or debugging mode. **Compilation flags:** `dynamic` **Template:** `leaping_(Mode)` **Mode and number of proofs:** `leaping_(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `leashing_/1` Table of currently leashed ports. **Compilation flags:** `dynamic` **Template:** `leashing_(Port)` **Mode and number of proofs:** `leashing_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `invocation_number_/1` Current call stack invocation number. **Compilation flags:** `dynamic` **Template:** `invocation_number_(N)` **Mode and number of proofs:** `invocation_number_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `jump_to_invocation_number_/1` Invocation number to jump to. **Compilation flags:** `dynamic` **Template:** `jump_to_invocation_number_(N)` **Mode and number of proofs:** `jump_to_invocation_number_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `zap_to_port_/1` Port to zap to. **Compilation flags:** `dynamic` **Template:** `zap_to_port_(Port)` **Mode and number of proofs:** `zap_to_port_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `write_max_depth_/1` Current term write maximum depth. **Compilation flags:** `dynamic` **Template:** `write_max_depth_(MaxDepth)` **Mode and number of proofs:** `write_max_depth_(?non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `log_point_/3` Table of log points. **Compilation flags:** `dynamic` **Template:** `log_point_(Entity,Line,Message)` **Mode and number of proofs:** `log_point_(?object_identifier,?integer,?atom)` - `zero_or_more` `log_point_(?category_identifier,?integer,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `clause_breakpoint_/2` Table of clause breakpoints. **Compilation flags:** `dynamic` **Template:** `clause_breakpoint_(Entity,Line)` **Mode and number of proofs:** `clause_breakpoint_(?object_identifier,?integer)` - `zero_or_more` `clause_breakpoint_(?category_identifier,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `predicate_breakpoint_/3` Table of predicate breakpoints. **Compilation flags:** `dynamic` **Template:** `predicate_breakpoint_(Functor,Arity,Original)` **Mode and number of proofs:** `predicate_breakpoint_(?atom,?integer,?predicate_indicator)` - `zero_or_more` `predicate_breakpoint_(?atom,?integer,?non_terminal_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `entity_predicate_breakpoint_/4` Table of entity predicate breakpoints. **Compilation flags:** `dynamic` **Template:** `entity_predicate_breakpoint_(Entity,Functor,Arity,Original)` **Mode and number of proofs:** `entity_predicate_breakpoint_(?callable,?atom,?integer,?qualified_predicate_indicator)` - `zero_or_more` `entity_predicate_breakpoint_(?callable,?atom,?integer,?qualified_non_terminal_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `context_breakpoint_/4` Table of context breakpoints. **Compilation flags:** `dynamic` **Template:** `context_breakpoint_(Sender,This,Self,Goal)` **Mode and number of proofs:** `context_breakpoint_(?object_identifier,?object_identifier,?object_identifier,?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `conditional_breakpoint_/3` Table of conditional breakpoints. **Compilation flags:** `dynamic` **Template:** `conditional_breakpoint_(Entity,Line,Condition)` **Mode and number of proofs:** `conditional_breakpoint_(?object_identifier,?integer,?callable)` - `zero_or_more` `conditional_breakpoint_(?category_identifier,?integer,?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `triggered_breakpoint_/4` Table of defined triggered breakpoints. **Compilation flags:** `dynamic` **Template:** `triggered_breakpoint_(Entity,Line,TriggerEntity,TriggerLine)` **Mode and number of proofs:** `triggered_breakpoint_(?object_identifier,?integer,?object_identifier,?integer)` - `zero_or_more` `triggered_breakpoint_(?object_identifier,?integer,?category_identifier,?integer)` - `zero_or_more` `triggered_breakpoint_(?category_identifier,?integer,?object_identifier,?integer)` - `zero_or_more` `triggered_breakpoint_(?category_identifier,?integer,?category_identifier,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `triggered_breakpoint_enabled_/2` Table of enabled triggered breakpoints. **Compilation flags:** `dynamic` **Template:** `triggered_breakpoint_enabled_(Entity,Line)` **Mode and number of proofs:** `triggered_breakpoint_enabled_(?object_identifier,?integer)` - `zero_or_more` `triggered_breakpoint_enabled_(?category_identifier,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `file_line_hit_count_/3` Table of file and line hit counts (successful unifications with clause heads). **Compilation flags:** `dynamic` **Template:** `file_line_hit_count_(File,Line,Count)` **Mode and number of proofs:** `file_line_hit_count_(?atom,?integer,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **category** #### `debugger_messages` Logtalk `debugger` tool default message translations. **Availability:** `logtalk_load(debugger(loader))` **Author:** Paulo Moura **Version:** 4:0:0 **Date:** 2025-12-18 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::question_prompt_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `debuggerp` Debugger protocol. **Availability:** `logtalk_load(debugger(loader))` **Author:** Paulo Moura **Version:** 3:6:0 **Date:** 2025-09-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Debugger help: Type the character `h` (condensed help) or the character `?` (extended help) at a leashed port. > > - Predicate breakpoint: Specified as a ground term `Functor/Arity`. > > - Non-terminal breakpoint: Specified as a ground term `Functor//Arity`. > > - Entity predicate breakpoint: Specified as a term `Entity::Functor/Arity`. `Entity` must be an object or category and may not be ground if parametric. > > - Entity non-terminal breakpoint: Specified as a term `Entity::Functor//Arity`. `Entity` must be an object or category and may not be ground if parametric. > > - Clause breakpoint: Specified as an `Entity-Line` term with both `Entity` and `Line` bound. `Line` must be the first source file line of an entity clause. > > - Conditional breakpoint: Specified using `Entity` and `Line` for the clause head and a condition. `Line` must be the first source file line of an entity clause. > > - Hit count breakpoint: Specified using `Entity` and `Line` for the clause head and an unification count expression as a condition. `Line` must be the first source file line of an entity clause. > > - Triggered breakpoint: Specified using `Entity` and `Line` for the clause head and another breakpoint as a condition. `Line` must be the first source file line of an entity clause. > > - Context breakpoint: Specified as a `(Sender,`` ``This,`` ``Self,`` ``Goal)` tuple. > > - Log point: Specified using `Entity` and `Line` for the clause head and a message. > > - Leash port shorthands: `none` - `[]`, `loose` - `[fact,rule,call]`, `half` - `[fact,rule,call,redo]`, `tight` - `[fact,rule,call,redo,fail,exception]`, and `full` - `[fact,rule,call,exit,redo,fail,exception]`. **Inherited public predicates:** (none) - Public predicates - `reset/0` - `debug/0` - `nodebug/0` - `debugging/0` - `debugging/1` - `trace/0` - `notrace/0` - `leash/1` - `leashing/1` - `spy/1` - `spying/1` - `nospy/1` - `spy/3` - `spying/3` - `nospy/3` - `spy/4` - `spying/4` - `nospy/4` - `nospyall/0` - `log/3` - `logging/3` - `nolog/3` - `nologall/0` - `write_max_depth/1` - `set_write_max_depth/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `reset/0` Resets all debugging settings (including breakpoints, log points, and leashed ports) and turns off debugging. **Compilation flags:** `static` **Mode and number of proofs:** `reset` - `one` **See also:** nospyall/0 ------------------------------------------------------------------------ ###### `debug/0` Starts debugging for all defined breakpoints. **Compilation flags:** `static` **Mode and number of proofs:** `debug` - `one` ------------------------------------------------------------------------ ###### `nodebug/0` Stops debugging for all defined breakpoints. Also turns off tracing. Does not remove defined breakpoints. **Compilation flags:** `static` **Mode and number of proofs:** `nodebug` - `one` **See also:** reset/0 ------------------------------------------------------------------------ ###### `debugging/0` Reports current debugging settings, including breakpoints and log points. **Compilation flags:** `static` **Mode and number of proofs:** `debugging` - `one` ------------------------------------------------------------------------ ###### `debugging/1` Enumerates, by backtracking, all entities compiled in debug mode. **Compilation flags:** `static` **Template:** `debugging(Entity)` **Mode and number of proofs:** `debugging(?entity_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `trace/0` Starts tracing all calls compiled in debug mode. **Compilation flags:** `static` **Mode and number of proofs:** `trace` - `one` ------------------------------------------------------------------------ ###### `notrace/0` Stops tracing of calls compiled in debug mode. Debugger will still stop at defined breakpoints. **Compilation flags:** `static` **Mode and number of proofs:** `notrace` - `one` ------------------------------------------------------------------------ ###### `leash/1` Sets the debugger leash ports using an abbreviation (`none`, `loose`, `half`, `tight`, or `full`) or a list of ports (valid ports are `fact`, `rule`, `call`, `exit`, `redo`, `fail`, and `exception`). **Compilation flags:** `static` **Template:** `leash(Ports)` **Mode and number of proofs:** `leash(+atom)` - `one` `leash(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `leashing/1` Enumerates, by backtracking, all leashed ports (valid ports are `fact`, `rule`, `call`, `exit`, `redo`, `fail`, and `exception`). **Compilation flags:** `static` **Template:** `leashing(Port)` **Mode and number of proofs:** `leashing(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `spy/1` Sets a predicate or clause breakpoint (removing any existing log point or breakpoint defined for the same location, or a list of breakpoints. Fails if a breakpoint is invalid. **Compilation flags:** `static` **Template:** `spy(Breakpoint)` **Mode and number of proofs:** `spy(@spy_point)` - `zero_or_one` `spy(@list(spy_point))` - `zero_or_one` ------------------------------------------------------------------------ ###### `spying/1` Enumerates, by backtracking, all defined predicate and clause breakpoints. **Compilation flags:** `static` **Template:** `spying(Breakpoint)` **Mode and number of proofs:** `spying(?spy_point)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nospy/1` Removes all matching predicate and clause breakpoints. **Compilation flags:** `static` **Template:** `nospy(Breakpoint)` **Mode and number of proofs:** `nospy(@var)` - `one` `nospy(@spy_point)` - `one` `nospy(@list(spy_point))` - `one` ------------------------------------------------------------------------ ###### `spy/3` Sets a conditional or triggered breakpoint (removing any existing log point or breakpoint defined for the same location) at a clause head. The condition can be a unification count expression, a lambda expression, or another breakpoint. Fails if the breakpoint is invalid. **Compilation flags:** `static` **Template:** `spy(Entity,Line,Condition)` **Mode and number of proofs:** `spy(+atom,+integer,@callable)` - `zero_or_one` **Remarks:** > - Unification count expression conditions: `>(Count)`, `>=(Count)`, `=:=(Count)`, `=<(Count)`, `<(Count)`, `mod(M)`, and `Count`. > > - Lambda expression conditions: `[Count,N,Goal]>>Condition` and `[Goal]>>Condition` where `Count` is the unification count, `N` is the invocation number, and `Goal` is the goal that unified with the clause head; `Condition` is called in the context of `user`. > > - Triggered breakpoint conditions: `Entity-Line`. ------------------------------------------------------------------------ ###### `spying/3` Enumerates, by backtracking, all conditional and triggered breakpoints. **Compilation flags:** `static` **Template:** `spying(Entity,Line,Condition)` **Mode and number of proofs:** `spying(?atom,?integer,?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nospy/3` Removes all matching conditional and triggered breakpoints. **Compilation flags:** `static` **Template:** `nospy(Entity,Line,Condition)` **Mode and number of proofs:** `nospy(@term,@term,@term)` - `one` ------------------------------------------------------------------------ ###### `spy/4` Sets a context breakpoint. **Compilation flags:** `static` **Template:** `spy(Sender,This,Self,Goal)` **Mode and number of proofs:** `spy(@term,@term,@term,@term)` - `one` ------------------------------------------------------------------------ ###### `spying/4` Enumerates, by backtracking, all defined context breakpoints. **Compilation flags:** `static` **Template:** `spying(Sender,This,Self,Goal)` **Mode and number of proofs:** `spying(?term,?term,?term,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nospy/4` Removes all matching context breakpoints. **Compilation flags:** `static` **Template:** `nospy(Sender,This,Self,Goal)` **Mode and number of proofs:** `nospy(@term,@term,@term,@term)` - `one` ------------------------------------------------------------------------ ###### `nospyall/0` Removes all breakpoints and log points. **Compilation flags:** `static` **Mode and number of proofs:** `nospyall` - `one` **See also:** reset/0 ------------------------------------------------------------------------ ###### `log/3` Sets a log point (removing any existing breakpoint defined for the same location) at a clause head. Fails if the log point is invalid. **Compilation flags:** `static` **Template:** `log(Entity,Line,Message)` **Mode and number of proofs:** `log(@object_identifier,+integer,+atom)` - `zero_or_one` `log(@category_identifier,+integer,+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `logging/3` Enumerates, by backtracking, all defined log points. **Compilation flags:** `static` **Template:** `logging(Entity,Line,Message)` **Mode and number of proofs:** `logging(?object_identifier,?integer,?atom)` - `zero_or_more` `logging(?category_identifier,?integer,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nolog/3` Removes all matching log points. **Compilation flags:** `static` **Template:** `nolog(Entity,Line,Message)` **Mode and number of proofs:** `nolog(@var_or(object_identifier),@var_or(integer),@var_or(atom))` - `one` `nolog(@var_or(category_identifier),@var_or(integer),@var_or(atom))` - `one` ------------------------------------------------------------------------ ###### `nologall/0` Removes all log points. **Compilation flags:** `static` **Mode and number of proofs:** `nologall` - `one` **See also:** reset/0 ------------------------------------------------------------------------ ###### `write_max_depth/1` Current term write maximum depth. When not defined, the backend default is used. **Compilation flags:** `static` **Template:** `write_max_depth(MaxDepth)` **Mode and number of proofs:** `write_max_depth(?non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `set_write_max_depth/1` Sets the default term maximum write depth. For most backends, a value of zero means that the whole term is written. **Compilation flags:** `static` **Template:** `set_write_max_depth(MaxDepth)` **Mode and number of proofs:** `set_write_max_depth(+non_negative_integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also debugger **object** #### `dump_trace` Simple solution for redirecting a debugger trace to a file. **Availability:** `logtalk_load(debugger(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2021-11-12 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** debugger **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `start_redirect_to_file/2` - `stop_redirect_to_file/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `start_redirect_to_file/2` Starts redirecting debugger trace messages to a file. **Compilation flags:** `static` **Template:** `start_redirect_to_file(File,Goal)` **Meta-predicate template:** `start_redirect_to_file(*,0)` **Mode and number of proofs:** `start_redirect_to_file(+atom,+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `stop_redirect_to_file/0` Stops redirecting debugger trace messages to a file. **Compilation flags:** `static` **Mode and number of proofs:** `stop_redirect_to_file` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### dependents") **category** #### `observer` Smalltalk dependent protocol. **Availability:** `logtalk_load(dependents(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2003-02-09 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `update/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `update/1` Called when an observed object is updated. **Compilation flags:** `static` **Template:** `update(Change)` **Mode and number of proofs:** `update(?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also subject **category** #### `subject` Smalltalk dependent handling predicates. **Availability:** `logtalk_load(dependents(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2003-02-09 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `changed/0` - `changed/1` - `dependents/1` - `addDependent/1` - `removeDependent/1` - Protected predicates - Private predicates - `dependent_/1` - Operators ##### Public predicates ###### `changed/0` Receiver changed in some way. Notify all dependents. **Compilation flags:** `static` **Mode and number of proofs:** `changed` - `one` ------------------------------------------------------------------------ ###### `changed/1` Receiver changed as specified in the argument. Notify all dependents. **Compilation flags:** `static` **Template:** `changed(Change)` **Mode and number of proofs:** `changed(?nonvar)` - `one` ------------------------------------------------------------------------ ###### `dependents/1` Returns a list of all dependent objects. **Compilation flags:** `static` **Template:** `dependents(Dependents)` **Mode and number of proofs:** `dependents(-list)` - `one` ------------------------------------------------------------------------ ###### `addDependent/1` Adds a new dependent object. **Compilation flags:** `static` **Template:** `addDependent(Dependent)` **Mode and number of proofs:** `addDependent(@object)` - `one` ------------------------------------------------------------------------ ###### `removeDependent/1` Removes a dependent object. **Compilation flags:** `static` **Template:** `removeDependent(Dependent)` **Mode and number of proofs:** `removeDependent(?object)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates ###### `dependent_/1` Table of dependent objects. **Compilation flags:** `dynamic` **Template:** `dependent_(Dependent)` **Mode and number of proofs:** `dependent_(?object)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also observer ### deques") **object** #### `deque` Double-ended queue (deque) implementation using difference lists to provide O(1) operations at both ends. **Availability:** `logtalk_load(deques(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` deque_protocol **Extends:** `public` compound **Uses:** list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_deque/2  as_list/2  check/1  depth/2  empty/1  ground/1  length/2  map/2  map/3  new/1  numbervars/1  numbervars/3  occurs/2  peek_back/2  peek_front/2  pop_back/3  pop_front/3  push_back/3  push_front/3  singletons/2  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `deque_protocol` Extracted protocol entity. **Availability:** `logtalk_load(deques(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `empty/1` - `push_front/3` - `push_back/3` - `pop_front/3` - `pop_back/3` - `peek_front/2` - `peek_back/2` - `length/2` - `map/2` - `map/3` - `as_list/2` - `as_deque/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `empty/1` True iff the deque is empty. **Compilation flags:** `static` **Template:** `empty(Deque)` **Mode and number of proofs:** `empty(+deque)` - `zero_or_one` ------------------------------------------------------------------------ ###### `push_front/3` Adds an element to the front of the deque. **Compilation flags:** `static` **Template:** `push_front(Element,DequeIn,DequeOut)` **Mode and number of proofs:** `push_front(+term,+deque,-deque)` - `one` ------------------------------------------------------------------------ ###### `push_back/3` Adds an element to the back of the deque. **Compilation flags:** `static` **Template:** `push_back(Element,DequeIn,DequeOut)` **Mode and number of proofs:** `push_back(+term,+deque,-deque)` - `one` ------------------------------------------------------------------------ ###### `pop_front/3` Removes and returns the front element. **Compilation flags:** `static` **Template:** `pop_front(DequeIn,Element,DequeOut)` **Mode and number of proofs:** `pop_front(+deque,-term,-deque)` - `zero_or_one` ------------------------------------------------------------------------ ###### `pop_back/3` Removes and returns the back element. **Compilation flags:** `static` **Template:** `pop_back(DequeIn,Element,DequeOut)` **Mode and number of proofs:** `pop_back(+deque,-term,-deque)` - `zero_or_one` ------------------------------------------------------------------------ ###### `peek_front/2` Returns the front element without removing it. **Compilation flags:** `static` **Template:** `peek_front(Deque,Element)` **Mode and number of proofs:** `peek_front(+deque,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `peek_back/2` Returns the back element without removing it. **Compilation flags:** `static` **Template:** `peek_back(Deque,Element)` **Mode and number of proofs:** `peek_back(+deque,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `length/2` Returns the number of elements in the deque. **Compilation flags:** `static` **Template:** `length(Deque,Length)` **Mode and number of proofs:** `length(+deque,-integer)` - `one` ------------------------------------------------------------------------ ###### `map/2` Applies a closure to all elements of a deque. **Compilation flags:** `static` **Template:** `map(Closure,Deque)` **Meta-predicate template:** `map(1,*)` **Mode and number of proofs:** `map(+callable,+deque)` - `zero_or_one` ------------------------------------------------------------------------ ###### `map/3` Applies a closure to all elements of a deque constructing a new deque. **Compilation flags:** `static` **Template:** `map(Closure,Deque,NewQueue)` **Meta-predicate template:** `map(2,*,*)` **Mode and number of proofs:** `map(+callable,+deque,?deque)` - `zero_or_one` ------------------------------------------------------------------------ ###### `as_list/2` Converts a deque to a list. **Compilation flags:** `static` **Template:** `as_list(Deque,List)` **Mode and number of proofs:** `as_list(+deque,-list)` - `one` ------------------------------------------------------------------------ ###### `as_deque/2` Converts a list to a deque. **Compilation flags:** `static` **Template:** `as_deque(List,Deque)` **Mode and number of proofs:** `as_deque(+list,-deque)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### derangements") **object** #### `derangements` Implementation of derangement operations over lists. **Availability:** `logtalk_load(derangements(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-12 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` derangements_protocol **Uses:** fast_random(Algorithm) list natural permutations **Remarks:** (none) **Inherited public predicates:**  count_derangements/2  count_distinct_derangements/2  count_partial_derangements/3  derangement/2  derangement/3  derangement_index/3  derangement_index/4  derangements/2  derangements/3  distinct_derangement/2  distinct_derangement/3  distinct_derangement_index/3  distinct_derangements/2  distinct_derangements/3  next_derangement/3  nth_derangement/3  nth_derangement/4  nth_distinct_derangement/3  previous_derangement/3  random_derangement/2  random_distinct_derangement/2  sample_derangements/3  sample_distinct_derangements/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `derangements_protocol` Protocol for derangement operations over lists. **Availability:** `logtalk_load(derangements(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-12 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `derangements/2` - `derangement/2` - `derangements/3` - `derangement/3` - `distinct_derangements/2` - `distinct_derangement/2` - `distinct_derangements/3` - `distinct_derangement/3` - `nth_derangement/3` - `nth_derangement/4` - `derangement_index/3` - `derangement_index/4` - `count_derangements/2` - `count_partial_derangements/3` - `count_distinct_derangements/2` - `nth_distinct_derangement/3` - `distinct_derangement_index/3` - `random_derangement/2` - `sample_derangements/3` - `random_distinct_derangement/2` - `sample_distinct_derangements/3` - `next_derangement/3` - `previous_derangement/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `derangements/2` Generates all derangements of a list using default order. **Compilation flags:** `static` **Template:** `derangements(List,Derangements)` **Mode and number of proofs:** `derangements(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `derangement/2` True iff the second argument is a derangement of the first argument using default order. **Compilation flags:** `static` **Template:** `derangement(List,Derangement)` **Mode and number of proofs:** `derangement(+list,-list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `derangements/3` Generates all derangements with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `derangements(List,Order,Derangements)` **Mode and number of proofs:** `derangements(+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `derangement/3` True iff the third argument is a derangement with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `derangement(List,Order,Derangement)` **Mode and number of proofs:** `derangement(+list,+atom,-list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `distinct_derangements/2` Generates all distinct derangements of a list using default order. **Compilation flags:** `static` **Template:** `distinct_derangements(List,Derangements)` **Mode and number of proofs:** `distinct_derangements(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_derangement/2` True iff the second argument is a distinct derangement of the first argument using default order. **Compilation flags:** `static` **Template:** `distinct_derangement(List,Derangement)` **Mode and number of proofs:** `distinct_derangement(+list,-list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `distinct_derangements/3` Generates all distinct derangements with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `distinct_derangements(List,Order,Derangements)` **Mode and number of proofs:** `distinct_derangements(+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_derangement/3` True iff the third argument is a distinct derangement with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `distinct_derangement(List,Order,Derangement)` **Mode and number of proofs:** `distinct_derangement(+list,+atom,-list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth_derangement/3` Returns the derangement at a given zero-based index using default order. **Compilation flags:** `static` **Template:** `nth_derangement(List,Index,Derangement)` **Mode and number of proofs:** `nth_derangement(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_derangement/4` Returns the derangement at a given zero-based index in the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `nth_derangement(List,Order,Index,Derangement)` **Mode and number of proofs:** `nth_derangement(+list,+atom,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `derangement_index/3` Returns the zero-based index of a derangement using default order. **Compilation flags:** `static` **Template:** `derangement_index(List,Derangement,Index)` **Mode and number of proofs:** `derangement_index(+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `derangement_index/4` Returns the zero-based index of a derangement in the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `derangement_index(List,Order,Derangement,Index)` **Mode and number of proofs:** `derangement_index(+list,+atom,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `count_derangements/2` Counts the number of derangements of a list. **Compilation flags:** `static` **Template:** `count_derangements(List,Count)` **Mode and number of proofs:** `count_derangements(+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `count_partial_derangements/3` Counts the number of permutations of a list with exactly the given number of fixed points. **Compilation flags:** `static` **Template:** `count_partial_derangements(FixedPoints,List,Count)` **Mode and number of proofs:** `count_partial_derangements(+integer,+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `count_distinct_derangements/2` Counts the number of distinct derangements of a list (deduplicating equal-valued derangements). **Compilation flags:** `static` **Template:** `count_distinct_derangements(List,Count)` **Mode and number of proofs:** `count_distinct_derangements(+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `nth_distinct_derangement/3` Returns the distinct derangement at a given zero-based index in default generation order. **Compilation flags:** `static` **Template:** `nth_distinct_derangement(List,Index,Derangement)` **Mode and number of proofs:** `nth_distinct_derangement(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_derangement_index/3` Returns the zero-based index of a distinct derangement in default generation order. **Compilation flags:** `static` **Template:** `distinct_derangement_index(List,Derangement,Index)` **Mode and number of proofs:** `distinct_derangement_index(+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_derangement/2` Returns a random derangement of a list. **Compilation flags:** `static` **Template:** `random_derangement(List,Derangement)` **Mode and number of proofs:** `random_derangement(+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_derangements/3` Returns SampleCount random derangements of a list, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_derangements(List,SampleCount,Samples)` **Mode and number of proofs:** `sample_derangements(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_distinct_derangement/2` Returns a random distinct derangement of a list (deduplicating equal-valued derangements). **Compilation flags:** `static` **Template:** `random_distinct_derangement(List,Derangement)` **Mode and number of proofs:** `random_distinct_derangement(+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_distinct_derangements/3` Returns SampleCount random distinct derangements of a list, sampled with replacement after deduplicating equal-valued derangements. **Compilation flags:** `static` **Template:** `sample_distinct_derangements(List,SampleCount,Samples)` **Mode and number of proofs:** `sample_distinct_derangements(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next_derangement/3` Returns the next distinct derangement value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `next_derangement(List,Derangement,Next)` **Mode and number of proofs:** `next_derangement(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_derangement/3` Returns the previous distinct derangement value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `previous_derangement(List,Derangement,Previous)` **Mode and number of proofs:** `previous_derangement(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### diagrams") **object** #### `caller_diagram` Predicates for generating caller diagrams in DOT format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-12 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` caller_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  predicate/1  predicate/2  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also xref_diagram, entity_diagram **object** #### `caller_diagram(Format)` - `Format` - Graph language file format. Predicates for generating caller diagrams showing direct and indirect callers of a predicate or a non-terminal. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-12 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` diagram(Format) **Uses:** list logtalk user **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - `predicate/2` - `predicate/1` - Protected predicates - Private predicates - `included_caller_/1` - Operators ##### Public predicates ###### `predicate/2` Creates a caller diagram for the given predicate or non-terminal using the specified options. Predicates are specified as `Entity::Name/Arity`. Non-terminals are specified as `Entity::Name//Arity`. **Compilation flags:** `static` **Template:** `predicate(QualifiedIndicator,Options)` **Mode and number of proofs:** `predicate(+qualified_predicate_indicator,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `predicate/1` Creates a caller diagram for the given predicate using default options. Predicates are specified as `Entity::Name/Arity`. Non-terminals are specified as `Entity::Name//Arity`. **Compilation flags:** `static` **Template:** `predicate(QualifiedIndicator)` **Mode and number of proofs:** `predicate(+qualified_predicate_indicator)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `included_caller_/1` Table of callers already included in the diagram. **Compilation flags:** `dynamic` **Template:** `included_caller_(Caller)` **Mode and number of proofs:** `included_caller_(?qualified_predicate_indicator)` - `zero_or_more` `included_caller_(?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also xref_diagram(Format), entity_diagram(Format) **object** #### `cytoscapejs_graph_language` Predicates for generating diagram files in the Cytoscape Exchange (CX2) JSON format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` graph_language_protocol **Imports:** `public` options **Provides:** graph_language_registry::language_object/2 **Uses:** list os term_io user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  edge/6  file_footer/3  file_header/3  graph_footer/5  graph_header/5  node/7  option/2  option/3  output_file_name/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `section_started_/1` - `in_nodes_section_/0` - `parent_stack_/1` - `edge_counter_/1` - `node_counter_/1` - `node_id_/2` - `containment_edge_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `section_started_/1` Tracks whether a JSON array section (`nodes` or `edges`) has already emitted at least one element. **Compilation flags:** `dynamic` **Template:** `section_started_(Section)` **Mode and number of proofs:** `section_started_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `in_nodes_section_/0` Flag indicating if the exporter is currently writing the nodes section. **Compilation flags:** `dynamic` **Mode and number of proofs:** `in_nodes_section_` - `zero_or_one` ------------------------------------------------------------------------ ###### `parent_stack_/1` Current stack of open graph container identifiers. **Compilation flags:** `dynamic` **Template:** `parent_stack_(Stack)` **Mode and number of proofs:** `parent_stack_(?list(nonvar))` - `zero_or_one` ------------------------------------------------------------------------ ###### `edge_counter_/1` Current counter used to generate unique edge identifiers. **Compilation flags:** `dynamic` **Template:** `edge_counter_(Counter)` **Mode and number of proofs:** `edge_counter_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `node_counter_/1` Current counter used to generate unique node identifiers. **Compilation flags:** `dynamic` **Template:** `node_counter_(Counter)` **Mode and number of proofs:** `node_counter_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `node_id_/2` Maps source node identifiers to generated CX2 numeric identifiers. **Compilation flags:** `dynamic` **Template:** `node_id_(Identifier,NumericId)` **Mode and number of proofs:** `node_id_(?nonvar,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `containment_edge_/2` Stores pending containment edges between parent and child nodes. **Compilation flags:** `dynamic` **Template:** `containment_edge_(ParentId,ChildId)` **Mode and number of proofs:** `containment_edge_(?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `d2_graph_language` Predicates for generating graph files in the DOT language (version 2.36.0 or later). **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:5:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` graph_language_protocol **Imports:** `public` options **Provides:** graph_language_registry::language_object/2 **Uses:** list os term_io user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  edge/6  file_footer/3  file_header/3  graph_footer/5  graph_header/5  node/7  option/2  option/3  output_file_name/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `diagram(Format)` - `Format` - Graph language file format. Common predicates for generating diagrams. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 3:18:0 **Date:** 2026-03-13 **Compilation flags:** `static` **Extends:** `public` options **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Uses:** graph_language_registry list logtalk modules_diagram_support os pairs type user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `libraries/3` - `libraries/2` - `libraries/1` - `all_libraries/1` - `all_libraries/0` - `rlibrary/2` - `rlibrary/1` - `library/2` - `library/1` - `directories/3` - `directories/2` - `rdirectory/3` - `rdirectory/2` - `rdirectory/1` - `directory/3` - `directory/2` - `directory/1` - `files/3` - `files/2` - `files/1` - `all_files/1` - `all_files/0` - `format_object/1` - `diagram_description/1` - `diagram_name_suffix/1` - Protected predicates - `diagram_caption/3` - `output_rlibrary/3` - `output_library/3` - `output_rdirectory/3` - `output_externals/1` - `output_files/2` - `output_file/4` - `output_sub_diagrams/1` - `reset/0` - `output_node/6` - `node/6` - `edge/5` - `output_edges/1` - `save_edge/5` - `output_missing_externals/1` - `not_excluded_file/4` - `output_file_path/4` - `locate_library/2` - `locate_directory/2` - `locate_file/5` - `ground_entity_identifier/3` - `filter_file_extension/3` - `filter_external_file_extension/3` - `add_link_options/3` - `supported_editor_url_scheme_prefix/1` - `omit_path_prefix/3` - `add_node_zoom_option/4` - `message_diagram_description/1` - Private predicates - `node_/6` - `node_path_/2` - `edge_/5` - `cycle_edge_/2` - Operators ##### Public predicates ###### `libraries/3` Creates a diagram for a set of libraries using the specified options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `libraries(Project,Libraries,Options)` **Mode and number of proofs:** `libraries(+atom,+list(atom),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `libraries/2` Creates a diagram for a set of libraries using the default options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `libraries(Project,Libraries)` **Mode and number of proofs:** `libraries(+atom,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `libraries/1` Creates a diagram for a set of libraries using the default options. The prefix `libraries` is used for the diagram file name. **Compilation flags:** `static` **Template:** `libraries(Libraries)` **Mode and number of proofs:** `libraries(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `all_libraries/1` Creates a diagram for all loaded libraries using the specified options. **Compilation flags:** `static` **Template:** `all_libraries(Options)` **Mode and number of proofs:** `all_libraries(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `all_libraries/0` Creates a diagram for all loaded libraries using default options. **Compilation flags:** `static` **Mode and number of proofs:** `all_libraries` - `one` ------------------------------------------------------------------------ ###### `rlibrary/2` Creates a diagram for a library and its sub-libraries using the specified options. **Compilation flags:** `static` **Template:** `rlibrary(Library,Options)` **Mode and number of proofs:** `rlibrary(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rlibrary/1` Creates a diagram for a library and its sub-libraries using default options. **Compilation flags:** `static` **Template:** `rlibrary(Library)` **Mode and number of proofs:** `rlibrary(+atom)` - `one` ------------------------------------------------------------------------ ###### `library/2` Creates a diagram for a library using the specified options. **Compilation flags:** `static` **Template:** `library(Library,Options)` **Mode and number of proofs:** `library(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `library/1` Creates a diagram for a library using default options. **Compilation flags:** `static` **Template:** `library(Library)` **Mode and number of proofs:** `library(+atom)` - `one` ------------------------------------------------------------------------ ###### `directories/3` Creates a diagram for a set of directories using the specified options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `directories(Project,Directories,Options)` **Mode and number of proofs:** `directories(+atom,+list(atom),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `directories/2` Creates a diagram for a set of directories using the default options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `directories(Project,Directories)` **Mode and number of proofs:** `directories(+atom,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `rdirectory/3` Creates a diagram for a directory and its sub-directories using the specified options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `rdirectory(Project,Directory,Options)` **Mode and number of proofs:** `rdirectory(+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rdirectory/2` Creates a diagram for a directory and its sub-directories using default options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `rdirectory(Project,Directory)` **Mode and number of proofs:** `rdirectory(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `rdirectory/1` Creates a diagram for a directory and its sub-directories using default options. The name of the directory is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `rdirectory(Directory)` **Mode and number of proofs:** `rdirectory(+atom)` - `one` ------------------------------------------------------------------------ ###### `directory/3` Creates a diagram for a directory using the specified options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `directory(Project,Directory,Options)` **Mode and number of proofs:** `directory(+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `directory/2` Creates a diagram for a directory using default options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `directory(Project,Directory)` **Mode and number of proofs:** `directory(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `directory/1` Creates a diagram for a directory using default options. The name of the directory is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `directory(Directory)` **Mode and number of proofs:** `directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `files/3` Creates a diagram for a set of files using the specified options. The file can be specified by name, basename, full path, or using library notation. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `files(Project,Files,Options)` **Mode and number of proofs:** `files(+atom,+list(atom),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `files/2` Creates a diagram for a set of files using the default options. The file can be specified by name, basename, full path, or using library notation. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `files(Project,Files)` **Mode and number of proofs:** `files(+atom,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `files/1` Creates a diagram for a set of files using the default options. The file can be specified by name, basename, full path, or using library notation. The prefix `files` is used for the diagram file name. **Compilation flags:** `static` **Template:** `files(Files)` **Mode and number of proofs:** `files(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `all_files/1` Creates a diagram for all loaded files using the specified options. **Compilation flags:** `static` **Template:** `all_files(Options)` **Mode and number of proofs:** `all_files(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `all_files/0` Creates a diagram for all loaded files using default options. **Compilation flags:** `static` **Mode and number of proofs:** `all_files` - `one` ------------------------------------------------------------------------ ###### `format_object/1` Returns the identifier of the object implementing the graph language currently being used. Fails if none is specified. **Compilation flags:** `static` **Template:** `format_object(Object)` **Mode and number of proofs:** `format_object(-object_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `diagram_description/1` Returns the diagram description. **Compilation flags:** `static` **Template:** `diagram_description(Description)` **Mode and number of proofs:** `diagram_description(-atom)` - `one` ------------------------------------------------------------------------ ###### `diagram_name_suffix/1` Returns the diagram name suffix. **Compilation flags:** `static` **Template:** `diagram_name_suffix(Suffix)` **Mode and number of proofs:** `diagram_name_suffix(-atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates ###### `diagram_caption/3` Creates a diagram caption from the diagram description and the subject and its kind. **Compilation flags:** `static` **Template:** `diagram_caption(Kind,Subject,Description)` **Mode and number of proofs:** `diagram_caption(+atom,+callable,-atom)` - `one` ------------------------------------------------------------------------ ###### `output_rlibrary/3` Generates diagram output for a library and its sub-libraries using the specified options. **Compilation flags:** `static` **Template:** `output_rlibrary(Library,Path,Options)` **Mode and number of proofs:** `output_rlibrary(+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `output_library/3` Generates diagram output for a library using the specified options. **Compilation flags:** `static` **Template:** `output_library(Library,Path,Options)` **Mode and number of proofs:** `output_library(+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `output_rdirectory/3` Generates diagram output for a directory and its sub-directories using the specified options. **Compilation flags:** `static` **Template:** `output_rdirectory(Project,Path,Options)` **Mode and number of proofs:** `output_rdirectory(+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `output_externals/1` Output external nodes using the specified options depending on the value of the boolean option `externals/1`. **Compilation flags:** `static` **Template:** `output_externals(Options)` **Mode and number of proofs:** `output_externals(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `output_files/2` Generates diagram output for a list of files using the specified options. **Compilation flags:** `static` **Template:** `output_files(Files,Options)` **Mode and number of proofs:** `output_files(+list,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `output_file/4` Generates diagram output for a file using the specified options. **Compilation flags:** `static` **Template:** `output_file(Path,Basename,Directory,Options)` **Mode and number of proofs:** `output_file(+atom,+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `output_sub_diagrams/1` Outputs sub-diagrams using the specified options. **Compilation flags:** `static` **Template:** `output_sub_diagrams(Options)` **Mode and number of proofs:** `output_sub_diagrams(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `reset/0` Resets all temporary information used when generating a diagram. **Compilation flags:** `static` **Mode and number of proofs:** `reset` - `one` ------------------------------------------------------------------------ ###### `output_node/6` Outputs a graph node. **Compilation flags:** `static` **Template:** `output_node(Identifier,Label,Caption,Contents,Kind,Options)` **Mode and number of proofs:** `output_node(+nonvar,+nonvar,+nonvar,+list(nonvar),+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `node/6` Enumerates, by backtracking, all saved nodes. **Compilation flags:** `static` **Template:** `node(Identifier,Label,Caption,Contents,Kind,Options)` **Mode and number of proofs:** `node(?nonvar,?nonvar,?nonvar,?list(compound),?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `edge/5` Enumerates, by backtracking, all saved edges. **Compilation flags:** `static` **Template:** `edge(From,To,Labels,Kind,Options)` **Mode and number of proofs:** `edge(?nonvar,?nonvar,?list(nonvar),?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `output_edges/1` Outputs all edges. **Compilation flags:** `static` **Template:** `output_edges(Options)` **Mode and number of proofs:** `output_edges(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `save_edge/5` Saves a graph edge. **Compilation flags:** `static` **Template:** `save_edge(From,To,Labels,Kind,Options)` **Mode and number of proofs:** `save_edge(+nonvar,+nonvar,+list(nonvar),+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `output_missing_externals/1` Outputs missing external nodes (usually due to unloaded resources) that are referenced from edges. **Compilation flags:** `static` **Template:** `output_missing_externals(Options)` **Mode and number of proofs:** `output_missing_externals(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `not_excluded_file/4` True when the given file is not excluded from the generated output. Excluded files may be specified by full path or by basename and with or without extension. Excluded directories may be listed by full or relative path. **Compilation flags:** `static` **Template:** `not_excluded_file(Path,Basename,ExcludedDirectories,ExcludedFiles)` **Mode and number of proofs:** `not_excluded_file(+atom,+atom,+list(atom),+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `output_file_path/4` Returns the output file path. **Compilation flags:** `static` **Template:** `output_file_path(Name,Options,Format,Path)` **Mode and number of proofs:** `output_file_path(+atom,+list(atom),+object_identifier,-atom)` - `one` ------------------------------------------------------------------------ ###### `locate_library/2` Locates a library given its name. **Compilation flags:** `static` **Template:** `locate_library(Library,Path)` **Mode and number of proofs:** `locate_library(+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `locate_directory/2` Locates a directory given its name or full path. **Compilation flags:** `static` **Template:** `locate_directory(Directory,Path)` **Mode and number of proofs:** `locate_directory(+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `locate_file/5` Locates a file given its name, basename, full path, or library notation representation. **Compilation flags:** `static` **Template:** `locate_file(File,Basename,Extension,Directory,Path)` **Mode and number of proofs:** `locate_file(+atom,+atom,+atom,+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `ground_entity_identifier/3` Converts an entity identifier to a ground term. **Compilation flags:** `static` **Template:** `ground_entity_identifier(Kind,Identifier,GroundIdentifier)` **Mode and number of proofs:** `ground_entity_identifier(+atom,+callable,-callable)` - `one` ------------------------------------------------------------------------ ###### `filter_file_extension/3` Filters the file name extension depending on the `file_extensions/1` option. **Compilation flags:** `static` **Template:** `filter_file_extension(Basename,Options,Name)` **Mode and number of proofs:** `filter_file_extension(+atom,+list(compound),-atom)` - `one` ------------------------------------------------------------------------ ###### `filter_external_file_extension/3` Filters the external file name extension depending on the `file_extensions/1` option. **Compilation flags:** `static` **Template:** `filter_external_file_extension(Path,Options,Name)` **Mode and number of proofs:** `filter_external_file_extension(+atom,+list(compound),-atom)` - `one` ------------------------------------------------------------------------ ###### `add_link_options/3` Adds `url/1`, `urls/2`, and `tooltip/1` link options (for use by the graph language) based on the specified path to the list of options. **Compilation flags:** `static` **Template:** `add_link_options(Path,Options,LinkingOptions)` **Mode and number of proofs:** `add_link_options(+atom,+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `supported_editor_url_scheme_prefix/1` Table of prefixes for text editors that supports a URL scheme to open diagram links. **Compilation flags:** `static` **Template:** `supported_editor_url_scheme_prefix(Prefix)` **Mode and number of proofs:** `supported_editor_url_scheme_prefix(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `omit_path_prefix/3` Removes a prefix from a path, returning the relative path, when using the option `omit_path_prefixes/1`. Used mainly for constructing directory and file node identifiers and captions. **Compilation flags:** `static` **Template:** `omit_path_prefix(Path,Options,Relative)` **Mode and number of proofs:** `omit_path_prefix(+atom,+list(compound),-atom)` - `one` ------------------------------------------------------------------------ ###### `add_node_zoom_option/4` Adds node zoom options when using the zoom option. **Compilation flags:** `static` **Template:** `add_node_zoom_option(Identifier,Suffix,Options,NodeOptions)` **Mode and number of proofs:** `add_node_zoom_option(+atom,+atom,+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `message_diagram_description/1` Diagram description for progress messages. **Compilation flags:** `static` **Template:** `message_diagram_description(Description)` **Mode and number of proofs:** `message_diagram_description(?atom)` - `one` ------------------------------------------------------------------------ ##### Private predicates ###### `node_/6` Table of saved nodes. **Compilation flags:** `dynamic` **Template:** `node_(Identifier,Label,Caption,Contents,Kind,Options)` **Mode and number of proofs:** `node_(?nonvar,?nonvar,?nonvar,?list(compound),?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `node_path_/2` Table of node paths. **Compilation flags:** `dynamic` **Template:** `node_path_(Node,Path)` **Mode and number of proofs:** `node_path_(?ground,?list(ground))` - `zero_or_more` ------------------------------------------------------------------------ ###### `edge_/5` Table of saved edges. **Compilation flags:** `dynamic` **Template:** `edge_(From,To,Labels,Kind,Options)` **Mode and number of proofs:** `edge_(?nonvar,?nonvar,?list(nonvar),?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `cycle_edge_/2` Table of edges that are part of a cycle. **Compilation flags:** `dynamic` **Template:** `cycle_edge_(From,To)` **Mode and number of proofs:** `cycle_edge_(?nonvar,?nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `diagrams` Predicates for generating all supported diagrams for libraries, directories, and files in one step using the DOT format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2019-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` diagrams(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  libraries/1  libraries/2  libraries/3  library/1  library/2  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `diagrams(Format)` - `Format` - Graph language file format. Predicates for generating all supported diagrams for libraries, directories, or files in one step using the specified format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:8:0 **Date:** 2019-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list os **Remarks:** > - Common options: `title/1`, `date/1`, `output_directory/1`, `relation_labels/1`, `node_type_captions/1`, `exclude_files/1`, `exclude_libraries/1`, `url_prefixes/1`, `omit_path_prefix/1`, `entity_url_suffix_target/2`, and `layout/1`. > > - Limitations: Some of the provided predicates only make sense for some types of diagrams. Also, fine tuning may require generating individual diagrams directly instead of as a batch using this utility object. **Inherited public predicates:** (none) - Public predicates - `libraries/3` - `libraries/2` - `libraries/1` - `all_libraries/1` - `all_libraries/0` - `rlibrary/2` - `rlibrary/1` - `library/2` - `library/1` - `directories/3` - `directories/2` - `rdirectory/3` - `rdirectory/2` - `rdirectory/1` - `directory/3` - `directory/2` - `directory/1` - `files/3` - `files/2` - `files/1` - `all_files/1` - `all_files/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `libraries/3` Creates all supported diagrams for a set of libraries using the specified options. The `Project` argument is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `libraries(Project,Libraries,Options)` **Mode and number of proofs:** `libraries(+atom,+list(atom),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `libraries/2` Creates all supported diagrams for a set of libraries using the default options. The `Project` argument is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `libraries(Project,Libraries)` **Mode and number of proofs:** `libraries(+atom,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `libraries/1` Creates all supported diagrams for a set of libraries using the default options. The prefix `libraries` is used for the diagram file names. **Compilation flags:** `static` **Template:** `libraries(Libraries)` **Mode and number of proofs:** `libraries(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `all_libraries/1` Creates all supported diagrams for all loaded libraries using the specified options. **Compilation flags:** `static` **Template:** `all_libraries(Options)` **Mode and number of proofs:** `all_libraries(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `all_libraries/0` Creates all supported diagrams for all loaded libraries using default options. **Compilation flags:** `static` **Mode and number of proofs:** `all_libraries` - `one` ------------------------------------------------------------------------ ###### `rlibrary/2` Creates all supported diagrams for a library and its sub-libraries using the specified options. **Compilation flags:** `static` **Template:** `rlibrary(Library,Options)` **Mode and number of proofs:** `rlibrary(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rlibrary/1` Creates all supported diagrams for a library and its sub-libraries using default options. **Compilation flags:** `static` **Template:** `rlibrary(Library)` **Mode and number of proofs:** `rlibrary(+atom)` - `one` ------------------------------------------------------------------------ ###### `library/2` Creates all supported diagrams for a library using the specified options. **Compilation flags:** `static` **Template:** `library(Library,Options)` **Mode and number of proofs:** `library(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `library/1` Creates all supported diagrams for a library using default options. **Compilation flags:** `static` **Template:** `library(Library)` **Mode and number of proofs:** `library(+atom)` - `one` ------------------------------------------------------------------------ ###### `directories/3` Creates all supported diagrams for a set of directories using the specified options. The `Project` argument is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `directories(Project,Directories,Options)` **Mode and number of proofs:** `directories(+atom,+list(atom),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `directories/2` Creates all supported diagrams for a directory using default options. The `Project` argument is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `directories(Project,Directories)` **Mode and number of proofs:** `directories(+atom,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `rdirectory/3` Creates all supported diagrams for a directory and its sub-directories using the specified options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `rdirectory(Project,Directory,Options)` **Mode and number of proofs:** `rdirectory(+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rdirectory/2` Creates all supported diagrams for a directory and its sub-directories using default options. The `Project` argument is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `rdirectory(Project,Directory)` **Mode and number of proofs:** `rdirectory(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `rdirectory/1` Creates all supported diagrams for a directory and its sub-directories using default options. The name of the directory is used as a prefix for the diagram file name. **Compilation flags:** `static` **Template:** `rdirectory(Directory)` **Mode and number of proofs:** `rdirectory(+atom)` - `one` ------------------------------------------------------------------------ ###### `directory/3` Creates all supported diagrams for a directory using the specified options. The `Project` argument is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `directory(Project,Directory,Options)` **Mode and number of proofs:** `directory(+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `directory/2` Creates all supported diagrams for a directory using default options. The `Project` argument is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `directory(Project,Directory)` **Mode and number of proofs:** `directory(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `directory/1` Creates all supported diagrams for a directory using default options. The name of the directory is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `directory(Directory)` **Mode and number of proofs:** `directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `files/3` Creates all supported diagrams for a set of files using the specified options. The file can be specified by name, basename, full path, or using library notation. The Project argument is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `files(Project,Files,Options)` **Mode and number of proofs:** `files(+atom,+list(atom),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `files/2` Creates all supported diagrams for a set of files using the default options. The file can be specified by name, basename, full path, or using library notation. The Project argument is used as a prefix for the diagram file names. **Compilation flags:** `static` **Template:** `files(Project,Files)` **Mode and number of proofs:** `files(+atom,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `files/1` Creates all supported diagrams for a set of files using the default options. The file can be specified by name, basename, full path, or using library notation. The prefix “files” is used for the diagram file names. **Compilation flags:** `static` **Template:** `files(Files)` **Mode and number of proofs:** `files(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `all_files/1` Creates all supported diagrams for all loaded files using the specified options. **Compilation flags:** `static` **Template:** `all_files(Options)` **Mode and number of proofs:** `all_files(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `all_files/0` Creates all supported diagrams for all loaded files using default options. **Compilation flags:** `static` **Mode and number of proofs:** `all_files` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `directory_dependency_diagram` Predicates for generating directory dependency diagrams in DOT format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2019-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` directory_dependency_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also directory_load_diagram, file_load_diagram **object** #### `directory_dependency_diagram(Format)` - `Format` - Graph language file format. Predicates for generating directory dependency diagrams. A dependency exists when an entity in one directory makes a reference to an entity in another directory. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 3:2:0 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` directory_diagram(Format) **Uses:** file_dependency_diagram(Format) list logtalk modules_diagram_support **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `sub_diagram_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `sub_diagram_/2` Table of directory sub-diagrams to support their generation. **Compilation flags:** `dynamic` **Template:** `sub_diagram_(Project,Directory)` **Mode and number of proofs:** `sub_diagram_(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also directory_load_diagram(Format), file_load_diagram(Format), library_load_diagram(Format) **category** #### `directory_diagram(Format)` - `Format` - Graph language file format. Common predicates for generating directory diagrams. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:13:0 **Date:** 2024-12-04 **Compilation flags:** `static` **Extends:** `public` diagram(Format) **Uses:** list **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `remember_included_directory/1` - `remember_referenced_logtalk_directory/1` - `remember_referenced_prolog_directory/1` - Private predicates - `included_directory_/1` - `referenced_logtalk_directory_/1` - `referenced_prolog_directory_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `remember_included_directory/1` Remember included Logtalk directory in the diagram. **Compilation flags:** `static` **Template:** `remember_included_directory(Path)` **Mode and number of proofs:** `remember_included_directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `remember_referenced_logtalk_directory/1` Remember referenced Logtalk directory in the diagram. **Compilation flags:** `static` **Template:** `remember_referenced_logtalk_directory(Path)` **Mode and number of proofs:** `remember_referenced_logtalk_directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `remember_referenced_prolog_directory/1` Remember referenced Prolog directory in the diagram. **Compilation flags:** `static` **Template:** `remember_referenced_prolog_directory(Path)` **Mode and number of proofs:** `remember_referenced_prolog_directory(+atom)` - `one` ------------------------------------------------------------------------ ##### Private predicates ###### `included_directory_/1` Table of Logtalk directories already included in the diagram. **Compilation flags:** `dynamic` **Template:** `included_directory_(Path)` **Mode and number of proofs:** `included_directory_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_logtalk_directory_/1` Table of referenced Logtalk directories in the diagram. **Compilation flags:** `dynamic` **Template:** `referenced_logtalk_directory_(Path)` **Mode and number of proofs:** `referenced_logtalk_directory_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_prolog_directory_/1` Table of referenced Prolog directories in the diagram. **Compilation flags:** `dynamic` **Template:** `referenced_prolog_directory_(Path)` **Mode and number of proofs:** `referenced_prolog_directory_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `directory_load_diagram` Predicates for generating directory loading dependency diagrams in DOT format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2019-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` directory_load_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also directory_dependency_diagram, file_dependency_diagram **object** #### `directory_load_diagram(Format)` - `Format` - Graph language file format. Predicates for generating directory loading dependency diagrams. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 3:0:1 **Date:** 2024-04-01 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` directory_diagram(Format) **Uses:** file_dependency_diagram(Format) file_load_diagram(Format) list logtalk modules_diagram_support **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `sub_diagram_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `sub_diagram_/2` Table of directory sub-diagrams to support their generation. **Compilation flags:** `dynamic` **Template:** `sub_diagram_(Project,Directory)` **Mode and number of proofs:** `sub_diagram_(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also directory_dependency_diagram(Format), file_dependency_diagram(Format), library_dependency_diagram(Format) **object** #### `dot_graph_language` Predicates for generating graph files in the DOT language (version 2.36.0 or later). **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 3:14:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` graph_language_protocol **Imports:** `public` options **Provides:** graph_language_registry::language_object/2 **Uses:** list os term_io user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  edge/6  file_footer/3  file_header/3  graph_footer/5  graph_header/5  node/7  option/2  option/3  output_file_name/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `entity_diagram` Predicates for generating entity diagrams in DOT format with both inheritance and cross-referencing relation edges. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2026-03-12 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` entity_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  file/1  file/2  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also inheritance_diagram, uses_diagram, caller_diagram, xref_diagram **object** #### `entity_diagram(Format)` - `Format` - Graph language file format. Predicates for generating entity diagrams in the specified format with both inheritance and cross-referencing relation edges. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:63:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` diagram(Format) **Uses:** coupling_metric list logtalk modules_diagram_support user **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - `file/2` - `file/1` - Protected predicates - Private predicates - `included_entity_/1` - `included_module_/1` - `referenced_entity_/2` - `referenced_module_/2` - Operators ##### Public predicates ###### `file/2` Creates a diagram for all entities in a loaded source file using the specified options. The file can be specified by name, basename, full path, or using library notation. **Compilation flags:** `static` **Template:** `file(File,Options)` **Mode and number of proofs:** `file(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `file/1` Creates a diagram for all entities in a loaded source file using default options. The file can be specified by name, basename, full path, or using library notation. **Compilation flags:** `static` **Template:** `file(File)` **Mode and number of proofs:** `file(+atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `included_entity_/1` Table of Logtalk entities already included in the diagram. **Compilation flags:** `dynamic` **Template:** `included_entity_(Entity)` **Mode and number of proofs:** `included_entity_(?entity_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `included_module_/1` Table of Prolog modules already included in the diagram. **Compilation flags:** `dynamic` **Template:** `included_module_(Module)` **Mode and number of proofs:** `included_module_(?module_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_entity_/2` Table of referenced Logtalk entities in the diagram. **Compilation flags:** `dynamic` **Template:** `referenced_entity_(Referencer,Entity)` **Mode and number of proofs:** `referenced_entity_(?entity_identifier,?entity_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_module_/2` Table of referenced Logtalk entities in the diagram. **Compilation flags:** `dynamic` **Template:** `referenced_module_(Referencer,Entity)` **Mode and number of proofs:** `referenced_module_(?entity_identifier,?module_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also inheritance_diagram(Format), uses_diagram(Format), caller_diagram(Format), xref_diagram(Format), library_diagram(Format) **object** #### `file_dependency_diagram` Predicates for generating file contents dependency diagrams in DOT format. A dependency exists when an entity in one file makes a reference to an entity in another file. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2019-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` file_dependency_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also file_load_diagram, directory_load_diagram, library_load_diagram **object** #### `file_dependency_diagram(Format)` - `Format` - Graph language file format. Predicates for generating file contents dependency diagrams. A dependency exists when an entity in one file makes a reference to an entity in another file. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:28:3 **Date:** 2024-04-01 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` file_diagram(Format) **Uses:** entity_diagram(Format) list logtalk modules_diagram_support os **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `sub_diagram_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `sub_diagram_/1` Table of file sub-diagrams to support their generation. **Compilation flags:** `dynamic` **Template:** `sub_diagram_(File)` **Mode and number of proofs:** `sub_diagram_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also file_load_diagram(Format), directory_load_diagram(Format), library_load_diagram(Format) **category** #### `file_diagram(Format)` - `Format` - Graph language file format. Common predicates for generating file diagrams. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:14:0 **Date:** 2024-12-04 **Compilation flags:** `static` **Extends:** `public` diagram(Format) **Uses:** list **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `remember_included_file/1` - `remember_referenced_logtalk_file/1` - `remember_referenced_prolog_file/1` - Private predicates - `included_file_/1` - `referenced_logtalk_file_/1` - `referenced_prolog_file_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `remember_included_file/1` Remember included Logtalk file in the diagram. **Compilation flags:** `static` **Template:** `remember_included_file(Path)` **Mode and number of proofs:** `remember_included_file(+atom)` - `one` ------------------------------------------------------------------------ ###### `remember_referenced_logtalk_file/1` Remember referenced Logtalk file in the diagram. **Compilation flags:** `static` **Template:** `remember_referenced_logtalk_file(Path)` **Mode and number of proofs:** `remember_referenced_logtalk_file(+atom)` - `one` ------------------------------------------------------------------------ ###### `remember_referenced_prolog_file/1` Remember referenced Prolog file in the diagram. **Compilation flags:** `static` **Template:** `remember_referenced_prolog_file(Path)` **Mode and number of proofs:** `remember_referenced_prolog_file(+atom)` - `one` ------------------------------------------------------------------------ ##### Private predicates ###### `included_file_/1` Table of Logtalk files already included in the diagram. **Compilation flags:** `dynamic` **Template:** `included_file_(Path)` **Mode and number of proofs:** `included_file_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_logtalk_file_/1` Table of referenced Logtalk files in the diagram. **Compilation flags:** `dynamic` **Template:** `referenced_logtalk_file_(Path)` **Mode and number of proofs:** `referenced_logtalk_file_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_prolog_file_/1` Table of referenced Prolog files in the diagram. **Compilation flags:** `dynamic` **Template:** `referenced_prolog_file_(Path)` **Mode and number of proofs:** `referenced_prolog_file_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `file_load_diagram` Predicates for generating file loading dependency diagrams in DOT format. A dependency exists when a file loads or includes another file. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2019-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` file_load_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also file_dependency_diagram, directory_dependency_diagram, library_dependency_diagram **object** #### `file_load_diagram(Format)` - `Format` - Graph language file format. Predicates for generating file loading dependency diagrams. A dependency exists when a file loads or includes another file. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:30:3 **Date:** 2024-12-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` file_diagram(Format) **Uses:** entity_diagram(Format) list logtalk modules_diagram_support os **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `sub_diagram_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `sub_diagram_/1` Table of file sub-diagrams to support their generation. **Compilation flags:** `dynamic` **Template:** `sub_diagram_(File)` **Mode and number of proofs:** `sub_diagram_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also file_dependency_diagram(Format), directory_dependency_diagram(Format), library_dependency_diagram(Format) **protocol** #### `graph_language_protocol` Predicates for generating graph files. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2014-12-30 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `output_file_name/2` - `file_header/3` - `file_footer/3` - `graph_header/5` - `graph_footer/5` - `node/7` - `edge/6` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `output_file_name/2` Constructs the diagram file basename by adding a graph language dependent extension to the given name. **Compilation flags:** `static` **Template:** `output_file_name(Name,Basename)` **Mode and number of proofs:** `output_file_name(+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `file_header/3` Writes the output file header using the specified options. **Compilation flags:** `static` **Template:** `file_header(Stream,Identifier,Options)` **Mode and number of proofs:** `file_header(+stream_or_alias,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `file_footer/3` Writes the output file footer using the specified options. **Compilation flags:** `static` **Template:** `file_footer(Stream,Identifier,Options)` **Mode and number of proofs:** `file_footer(+stream_or_alias,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `graph_header/5` Writes a graph header using the specified options. **Compilation flags:** `static` **Template:** `graph_header(Stream,Identifier,Label,Kind,Options)` **Mode and number of proofs:** `graph_header(+stream_or_alias,+atom,+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `graph_footer/5` Writes a graph footer using the specified options. **Compilation flags:** `static` **Template:** `graph_footer(Stream,Identifier,Label,Kind,Options)` **Mode and number of proofs:** `graph_footer(+stream_or_alias,+atom,+atom,+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `node/7` Writes a node using the specified options. **Compilation flags:** `static` **Template:** `node(Stream,Identifier,Label,Caption,Lines,Kind,Options)` **Mode and number of proofs:** `node(+stream_or_alias,+nonvar,+nonvar,+nonvar,+list(nonvar),+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `edge/6` Writes an edge between two nodes using the specified options. **Compilation flags:** `static` **Template:** `edge(Stream,Start,End,Labels,Kind,Options)` **Mode and number of proofs:** `edge(+stream_or_alias,+nonvar,+nonvar,+list(nonvar),+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `graph_language_registry` Registry of implemented graph languages. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2020-03-25 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `language_object/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `language_object/2` Table of defined graph languages and their implementation objects. **Compilation flags:** `static,`` ``multifile` **Template:** `language_object(Language,Object)` **Mode and number of proofs:** `language_object(?atom,?object_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `inheritance_diagram` Predicates for generating entity diagrams in DOT format with inheritance relation edges but no cross-referencing relation edges. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2014-01-15 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` inheritance_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  file/1  file/2  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also entity_diagram, uses_diagram, xref_diagram **object** #### `inheritance_diagram(Format)` - `Format` - Graph language file format. Predicates for generating entity diagrams in the specified format with inheritance relation edges but no cross-referencing relation edges. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:20:0 **Date:** 2024-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` entity_diagram(Format) **Uses:** logtalk **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  file/1  file/2  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also entity_diagram(Format), uses_diagram(Format), xref_diagram(Format) **object** #### `library_dependency_diagram` Predicates for generating library dependency diagrams in DOT format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2019-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` library_dependency_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also library_load_diagram, file_load_diagram, entity_diagram **object** #### `library_dependency_diagram(Format)` - `Format` - Graph language file format. Predicates for generating library dependency diagrams. A dependency exists when an entity in one library makes a reference to an entity in another library. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:35:0 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` library_diagram(Format) **Uses:** entity_diagram(Format) list logtalk modules_diagram_support **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `sub_diagram_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `sub_diagram_/1` Table of library sub-diagrams to support their generation. **Compilation flags:** `dynamic` **Template:** `sub_diagram_(Library)` **Mode and number of proofs:** `sub_diagram_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also library_load_diagram(Format), directory_load_diagram(Format), file_load_diagram(Format), entity_diagram(Format) **category** #### `library_diagram(Format)` - `Format` - Graph language file format. Common predicates for generating library diagrams. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:17:0 **Date:** 2024-12-04 **Compilation flags:** `static` **Extends:** `public` diagram(Format) **Uses:** list user **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `add_library_documentation_url/4` - `remember_included_library/2` - `remember_referenced_logtalk_library/2` - `remember_referenced_prolog_library/2` - Private predicates - `included_library_/2` - `referenced_logtalk_library_/2` - `referenced_prolog_library_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `add_library_documentation_url/4` Adds a documentation URL when using the option url_prefixes/2. **Compilation flags:** `static` **Template:** `add_library_documentation_url(Kind,Options,Library,NodeOptions)` **Mode and number of proofs:** `add_library_documentation_url(+atom,+list(compound),+atom,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `remember_included_library/2` Remember included Logtalk library in the diagram. **Compilation flags:** `static` **Template:** `remember_included_library(Library,Path)` **Mode and number of proofs:** `remember_included_library(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `remember_referenced_logtalk_library/2` Remember referenced Logtalk library in the diagram. **Compilation flags:** `static` **Template:** `remember_referenced_logtalk_library(Library,Path)` **Mode and number of proofs:** `remember_referenced_logtalk_library(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `remember_referenced_prolog_library/2` Remember referenced Prolog library in the diagram. **Compilation flags:** `static` **Template:** `remember_referenced_prolog_library(Library,Path)` **Mode and number of proofs:** `remember_referenced_prolog_library(+atom,+atom)` - `one` ------------------------------------------------------------------------ ##### Private predicates ###### `included_library_/2` Table of Logtalk libraries already included in the diagram. **Compilation flags:** `dynamic` **Template:** `included_library_(Library,Path)` **Mode and number of proofs:** `included_library_(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_logtalk_library_/2` Table of referenced Logtalk libraries in the diagram. **Compilation flags:** `dynamic` **Template:** `referenced_logtalk_library_(Library,Path)` **Mode and number of proofs:** `referenced_logtalk_library_(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_prolog_library_/2` Table of referenced Prolog libraries in the diagram. **Compilation flags:** `dynamic` **Template:** `referenced_prolog_library_(Library,Path)` **Mode and number of proofs:** `referenced_prolog_library_(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also inheritance_diagram(Format), uses_diagram(Format), xref_diagram(Format), entity_diagram(Format) **object** #### `library_load_diagram` Predicates for generating library loading dependency diagrams in DOT format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2019-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` library_load_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also library_dependency_diagram, file_dependency_diagram, entity_diagram **object** #### `library_load_diagram(Format)` - `Format` - Graph language file format. Predicates for generating library loading dependency diagrams. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:33:1 **Date:** 2024-04-01 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` library_diagram(Format) **Uses:** entity_diagram(Format) list logtalk modules_diagram_support **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `sub_diagram_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `sub_diagram_/1` Table of library sub-diagrams to support their generation. **Compilation flags:** `dynamic` **Template:** `sub_diagram_(Library)` **Mode and number of proofs:** `sub_diagram_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also library_dependency_diagram(Format), directory_dependency_diagram(Format), file_dependency_diagram(Format), entity_diagram(Format) **object** #### `mermaid_graph_language` Predicates for generating graph files using Mermaid. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 0:5:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` graph_language_protocol **Imports:** `public` options **Provides:** graph_language_registry::language_object/2 **Uses:** list os term_io user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  edge/6  file_footer/3  file_header/3  graph_footer/5  graph_header/5  node/7  option/2  option/3  output_file_name/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `edge_index_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `edge_index_/1` Current edge index counter. **Compilation flags:** `dynamic` **Template:** `edge_index_(Index)` **Mode and number of proofs:** `edge_index_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `modules_diagram_support` Utility predicates for supporting Prolog modules in diagrams. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 0:19:5 **Date:** 2022-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Supported backend Prolog systems: ECLiPSe, SICStus Prolog, SWI-Prolog, and YAP. **Inherited public predicates:** (none) - Public predicates - `module_property/2` - `loaded_file_property/2` - `source_file_extension/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `module_property/2` Access to module properties, at least `exports/1`, `file/1`, and `file/2` but also `declares/2`, `defines/2`, `calls/2`, and `provides/3` when possible. **Compilation flags:** `static` **Template:** `module_property(Module,Property)` **Mode and number of proofs:** `module_property(?atom,?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `loaded_file_property/2` Access to loaded source file properties, at least `basename/1`, `directory/1` but also `parent/1` when possible. **Compilation flags:** `static` **Template:** `loaded_file_property(File,Property)` **Mode and number of proofs:** `loaded_file_property(?atom,?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `source_file_extension/1` Valid source file extension for Prolog source files. **Compilation flags:** `static` **Template:** `source_file_extension(Extension)` **Mode and number of proofs:** `source_file_extension(?atom)` - `one_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `plantuml_graph_language` Predicates for generating diagrams in PlantUML format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` graph_language_protocol **Imports:** `public` options **Provides:** graph_language_registry::language_object/2 **Uses:** list os term_io user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  edge/6  file_footer/3  file_header/3  graph_footer/5  graph_header/5  node/7  option/2  option/3  output_file_name/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `uses_diagram` Predicates for generating entity diagrams in DOT format with only `uses/2` and `use_module/2` relation edges. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:0:1 **Date:** 2020-03-27 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` uses_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  file/1  file/2  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also entity_diagram, inheritance_diagram, xref_diagram **object** #### `uses_diagram(Format)` - `Format` - Graph language file format. Predicates for generating entity diagrams with only `uses/2` and `use_module/2` relation edges. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:21:0 **Date:** 2024-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` entity_diagram(Format) **Uses:** logtalk **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  file/1  file/2  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also entity_diagram(Format), inheritance_diagram(Format), xref_diagram(Format) **object** #### `xref_diagram` Predicates for generating predicate call cross-referencing diagrams in DOT format. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2026-03-12 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` xref_diagram(dot) **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  entity/1  entity/2  file/1  file/2  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also caller_diagram, entity_diagram, inheritance_diagram, uses_diagram **object** #### `xref_diagram(Format)` - `Format` - Graph language file format. Predicates for generating predicate call cross-referencing diagrams. **Availability:** `logtalk_load(diagrams(loader))` **Author:** Paulo Moura **Version:** 2:86:0 **Date:** 2026-03-12 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` entity_diagram(Format) **Uses:** atom list logtalk modules_diagram_support os user **Remarks:** (none) **Inherited public predicates:**  all_files/0  all_files/1  all_libraries/0  all_libraries/1  check_option/1  check_options/1  default_option/1  default_options/1  diagram_description/1  diagram_name_suffix/1  directories/2  directories/3  directory/1  directory/2  directory/3  file/1  file/2  files/1  files/2  files/3  format_object/1  libraries/1  libraries/2  libraries/3  library/1  library/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory/3  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - `entity/2` - `entity/1` - Protected predicates - Private predicates - `included_predicate_/1` - `referenced_predicate_/1` - `external_predicate_/1` - Operators ##### Public predicates ###### `entity/2` Creates a diagram for a single entity using the specified options. **Compilation flags:** `static` **Template:** `entity(Entity,Options)` **Mode and number of proofs:** `entity(+entity_identifier,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `entity/1` Creates a diagram for a single entity using default options. **Compilation flags:** `static` **Template:** `entity(Entity)` **Mode and number of proofs:** `entity(+entity_identifier)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `included_predicate_/1` Table of predicates already included in the diagram for the entity under processing. **Compilation flags:** `dynamic` **Template:** `included_predicate_(Predicate)` **Mode and number of proofs:** `included_predicate_(?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `referenced_predicate_/1` Table of referenced predicates for the entity under processing. **Compilation flags:** `dynamic` **Template:** `referenced_predicate_(Predicate)` **Mode and number of proofs:** `referenced_predicate_(?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `external_predicate_/1` Table of external predicate references for all the entities under processing. **Compilation flags:** `dynamic` **Template:** `external_predicate_(Reference)` **Mode and number of proofs:** `external_predicate_(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also caller_diagram(Format), entity_diagram(Format), inheritance_diagram(Format), uses_diagram(Format) ### dictionaries") **object** #### `avltree` AVL tree implementation of the dictionary protocol. Uses standard order to compare keys. **Availability:** `logtalk_load(dictionaries(loader))` **Author:** R.A.O’Keefe, L.Damas, V.S.Costa, Glenn Burgess, Jiri Spitz, and Jan Wielemaker; Logtalk port and additional predicates by Paulo Moura **Version:** 1:6:0 **Date:** 2026-02-10 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` dictionaryp **Extends:** `public` term **Uses:** list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  apply/4  as_curly_bracketed/2  as_dictionary/2  as_list/2  check/1  clone/3  clone/4  delete/4  delete_max/4  delete_min/4  depth/2  empty/1  ground/1  insert/4  intersection/2  intersection/3  keys/2  lookup/2  lookup/3  lookup/4  map/2  map/3  max/3  min/3  new/1  next/4  numbervars/1  numbervars/3  occurs/2  previous/4  singletons/2  size/2  subsumes/2  subterm/2  update/3  update/4  update/5  valid/1  values/2  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also bintree, rbtree **object** #### `bintree` Simple binary tree implementation of the dictionary protocol. Uses standard order to compare keys. **Availability:** `logtalk_load(dictionaries(loader))` **Author:** Paulo Moura and Paul Fodor **Version:** 2:13:0 **Date:** 2026-02-10 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` dictionaryp **Extends:** `public` term **Uses:** list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  apply/4  as_curly_bracketed/2  as_dictionary/2  as_list/2  check/1  clone/3  clone/4  delete/4  delete_max/4  delete_min/4  depth/2  empty/1  ground/1  insert/4  intersection/2  intersection/3  keys/2  lookup/2  lookup/3  lookup/4  map/2  map/3  max/3  min/3  new/1  next/4  numbervars/1  numbervars/3  occurs/2  previous/4  singletons/2  size/2  subsumes/2  subterm/2  update/3  update/4  update/5  valid/1  values/2  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `preorder/2` - `inorder/2` - `postorder/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `preorder/2` Preorder tree traversal. **Compilation flags:** `static` **Template:** `preorder(Tree,List)` **Mode and number of proofs:** `preorder(@tree,-list)` - `one` ------------------------------------------------------------------------ ###### `inorder/2` Inorder tree traversal. **Compilation flags:** `static` **Template:** `inorder(Tree,List)` **Mode and number of proofs:** `inorder(@tree,-list)` - `one` ------------------------------------------------------------------------ ###### `postorder/2` Postorder tree traversal. **Compilation flags:** `static` **Template:** `postorder(Tree,List)` **Mode and number of proofs:** `postorder(@tree,-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also avltree, rbtree, splaytree **protocol** #### `dictionaryp` Dictionary protocol. **Availability:** `logtalk_load(dictionaries(loader))` **Author:** Paulo Moura **Version:** 2:6:0 **Date:** 2026-02-10 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `as_dictionary/2` - `as_list/2` - `as_curly_bracketed/2` - `clone/3` - `clone/4` - `insert/4` - `delete/4` - `update/4` - `update/5` - `update/3` - `empty/1` - `lookup/4` - `lookup/3` - `lookup/2` - `intersection/2` - `intersection/3` - `previous/4` - `next/4` - `min/3` - `max/3` - `delete_min/4` - `delete_max/4` - `keys/2` - `values/2` - `map/2` - `map/3` - `apply/4` - `size/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `as_dictionary/2` Converts a list of key-value pairs to a dictionary. **Compilation flags:** `static` **Template:** `as_dictionary(Pairs,Dictionary)` **Mode and number of proofs:** `as_dictionary(@list(pairs),-dictionary)` - `one` ------------------------------------------------------------------------ ###### `as_list/2` Converts a dictionary to an ordered list (as per standard order) of key-value pairs. **Compilation flags:** `static` **Template:** `as_list(Dictionary,Pairs)` **Mode and number of proofs:** `as_list(@dictionary,-list(pairs))` - `one` ------------------------------------------------------------------------ ###### `as_curly_bracketed/2` Creates a curly-bracketed term representation of a dictionary. **Compilation flags:** `static` **Template:** `as_curly_bracketed(Dictionary,Term)` **Mode and number of proofs:** `as_curly_bracketed(+dictionary,--term)` - `one` ------------------------------------------------------------------------ ###### `clone/3` Clones a dictionary using the same keys but with all values unbound and returning a list of all the pairs in the new clone. **Compilation flags:** `static` **Template:** `clone(Dictionary,Clone,ClonePairs)` **Mode and number of proofs:** `clone(+dictionary,-dictionary,-list(pairs))` - `one` ------------------------------------------------------------------------ ###### `clone/4` Clones a dictionary using the same keys but with all values unbound and returning the list of all pairs in the dictionary and in the clone. **Compilation flags:** `static` **Template:** `clone(Dictionary,Pairs,Clone,ClonePairs)` **Mode and number of proofs:** `clone(+dictionary,-list(pairs),-dictionary,-list(pairs))` - `one` ------------------------------------------------------------------------ ###### `insert/4` Inserts a key-value pair into a dictionary, returning the updated dictionary. When the key already exists, the associated value is updated. **Compilation flags:** `static` **Template:** `insert(OldDictionary,Key,Value,NewDictionary)` **Mode and number of proofs:** `insert(+dictionary,+ground,@term,-dictionary)` - `one` ------------------------------------------------------------------------ ###### `delete/4` Deletes a matching key-value pair from a dictionary, returning the updated dictionary. Fails if it cannot find the key or if the key exists but the value does not unify. **Compilation flags:** `static` **Template:** `delete(OldDictionary,Key,Value,NewDictionary)` **Mode and number of proofs:** `delete(+dictionary,@ground,?term,-dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update/4` Updates the value associated with Key in a dictionary, returning the updated dictionary. Fails if it cannot find the key. **Compilation flags:** `static` **Template:** `update(OldDictionary,Key,NewValue,NewDictionary)` **Mode and number of proofs:** `update(+dictionary,@ground,+term,-dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update/5` Updates the value associated with a key in a dictionary, returning the updated dictionary. Fails if it cannot find the key or if the existing value does not unify. **Compilation flags:** `static` **Template:** `update(OldDictionary,Key,OldValue,NewValue,NewDictionary)` **Mode and number of proofs:** `update(+dictionary,@ground,?term,+term,-dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update/3` Updates the key-value pairs in a dictionary, returning the updated dictionary. Fails if it cannot find one of the keys. **Compilation flags:** `static` **Template:** `update(OldDictionary,Pairs,NewDictionary)` **Mode and number of proofs:** `update(+dictionary,@list(pair),-dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `empty/1` True iff the dictionary is empty. **Compilation flags:** `static` **Template:** `empty(Dictionary)` **Mode and number of proofs:** `empty(@dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `lookup/4` Lookups a matching key-value pair from a dictionary and returns the splayed dictionary with the key at the root. Fails if the key is not found. In implementations that do not update the dictionary on lookup, the same dictionary is returned. **Compilation flags:** `static` **Template:** `lookup(Key,Value,Dictionary,SplayedDictionary)` **Mode and number of proofs:** `lookup(+ground,?term,+tree,-tree)` - `zero_or_one` ------------------------------------------------------------------------ ###### `lookup/3` Lookups a matching key-value pair from a dictionary. Fails if no match is found. **Compilation flags:** `static` **Template:** `lookup(Key,Value,Dictionary)` **Mode and number of proofs:** `lookup(+ground,?term,@dictionary)` - `zero_or_one` `lookup(-ground,?term,@dictionary)` - `zero_or_more` ------------------------------------------------------------------------ ###### `lookup/2` Lookups all matching key-value pairs from a dictionary. Fails if it cannot find one of the keys or if a value for a key does not unify. **Compilation flags:** `static` **Template:** `lookup(Pairs,Dictionary)` **Mode and number of proofs:** `lookup(+list(pair),@dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `intersection/2` True iff the values of the dictionaries common keys unify. Trivially true when there are no common keys. **Compilation flags:** `static` **Template:** `intersection(Dictionary1,Dictionary2)` **Mode and number of proofs:** `intersection(+dictionary,+dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `intersection/3` Returns the (possibly empty) intersection between two dictionaries when the values of their common keys unify. **Compilation flags:** `static` **Template:** `intersection(Dictionary1,Dictionary2,Intersection)` **Mode and number of proofs:** `intersection(+dictionary,+dictionary,-dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous/4` Returns the previous pair in a dictionary given a key. Fails if there is no previous pair. **Compilation flags:** `static` **Template:** `previous(Dictionary,Key,Previous,Value)` **Mode and number of proofs:** `previous(+dictionary,+key,-key,-value)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next/4` Returns the next pair in a dictionary given a key. Fails if there is no next pair. **Compilation flags:** `static` **Template:** `next(Dictionary,Key,Next,Value)` **Mode and number of proofs:** `next(+dictionary,+key,-key,-value)` - `zero_or_one` ------------------------------------------------------------------------ ###### `min/3` Returns the pair with the minimum key (as per standard order) in a dictionary. Fails if the dictionary is empty. **Compilation flags:** `static` **Template:** `min(Dictionary,Key,Value)` **Mode and number of proofs:** `min(+dictionary,-key,-value)` - `zero_or_one` ------------------------------------------------------------------------ ###### `max/3` Returns the pair with the maximum key (as per standard order) in a dictionary. Fails if the dictionary is empty. **Compilation flags:** `static` **Template:** `max(Dictionary,Key,Value)` **Mode and number of proofs:** `max(+dictionary,-key,-value)` - `zero_or_one` ------------------------------------------------------------------------ ###### `delete_min/4` Deletes the pair with the minimum key (as per standard order) from a dictionary, returning the deleted pair and the updated dictionary. Fails if the dictionary is empty. **Compilation flags:** `static` **Template:** `delete_min(OldDictionary,Key,Value,NewDictionary)` **Mode and number of proofs:** `delete_min(+dictionary,-key,-value,-dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `delete_max/4` Deletes the pair with the maximum key (as per standard order) from a dictionary, returning the deleted pair and the updated dictionary. Fails if the dictionary is empty. **Compilation flags:** `static` **Template:** `delete_max(OldDictionary,Key,Value,NewDictionary)` **Mode and number of proofs:** `delete_max(+dictionary,-key,-value,-dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `keys/2` Returns a list with all the dictionary keys in ascending order (as per standard order). **Compilation flags:** `static` **Template:** `keys(Dictionary,Keys)` **Mode and number of proofs:** `keys(@dictionary,-list)` - `one` ------------------------------------------------------------------------ ###### `values/2` Returns a list with all the dictionary values in ascending order of the keys (as per standard order). **Compilation flags:** `static` **Template:** `values(Dictionary,Values)` **Mode and number of proofs:** `values(@dictionary,-list)` - `one` ------------------------------------------------------------------------ ###### `map/2` Maps a closure over each dictionary key-value pair. Fails if the mapped closure attempts to modify the keys. **Compilation flags:** `static` **Template:** `map(Closure,Dictionary)` **Meta-predicate template:** `map(1,*)` **Mode and number of proofs:** `map(@callable,+dictionary)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map/3` Maps a closure over each dictionary key-value pair, returning the new dictionary. Fails if the mapped closure attempts to modify the keys. **Compilation flags:** `static` **Template:** `map(Closure,OldDictionary,NewDictionary)` **Meta-predicate template:** `map(2,*,*)` **Mode and number of proofs:** `map(@callable,+dictionary,-dictionary)` - `zero_or_more` ------------------------------------------------------------------------ ###### `apply/4` Applies a closure to a specific key-value pair, returning the new dictionary. Fails if the key cannot be found or if the mapped closure attempts to modify the key. **Compilation flags:** `static` **Template:** `apply(Closure,OldDictionary,Key,NewDictionary)` **Meta-predicate template:** `apply(2,*,*,*)` **Mode and number of proofs:** `apply(+callable,+dictionary,+key,-dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `size/2` Number of dictionary entries. **Compilation flags:** `static` **Template:** `size(Dictionary,Size)` **Mode and number of proofs:** `size(@dictionary,?integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also avltree, bintree, rbtree, splaytree **object** #### `rbtree` Red-Black tree implementation of the dictionary protocol. Uses standard order to compare keys. **Availability:** `logtalk_load(dictionaries(loader))` **Author:** Vitor Santos Costa; Logtalk port and additional predicates by Paulo Moura. **Version:** 1:11:0 **Date:** 2026-02-10 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` dictionaryp **Extends:** `public` term **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  apply/4  as_curly_bracketed/2  as_dictionary/2  as_list/2  check/1  clone/3  clone/4  delete/4  delete_max/4  delete_min/4  depth/2  empty/1  ground/1  insert/4  intersection/2  intersection/3  keys/2  lookup/2  lookup/3  lookup/4  map/2  map/3  max/3  min/3  new/1  next/4  numbervars/1  numbervars/3  occurs/2  previous/4  singletons/2  size/2  subsumes/2  subterm/2  update/3  update/4  update/5  valid/1  values/2  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `partial_map/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `partial_map/4` Applies a closure to the tree pairs identified by a set of keys. **Compilation flags:** `static` **Template:** `partial_map(Tree,Keys,Closure,NewTree)` **Meta-predicate template:** `partial_map(*,*,2,*)` **Mode and number of proofs:** `partial_map(+tree,+list,@closure,-tree)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also avltree, splaytree, bintree **object** #### `splaytree` Splay tree implementation of the dictionary protocol. A splay tree is a self-adjusting binary search tree with the property that recently accessed elements are quick to access again. Uses standard order to compare keys. **Availability:** `logtalk_load(dictionaries(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-10 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` dictionaryp **Extends:** `public` term **Uses:** list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  apply/4  as_curly_bracketed/2  as_dictionary/2  as_list/2  check/1  clone/3  clone/4  delete/4  delete_max/4  delete_min/4  depth/2  empty/1  ground/1  insert/4  intersection/2  intersection/3  keys/2  lookup/2  lookup/3  lookup/4  map/2  map/3  max/3  min/3  new/1  next/4  numbervars/1  numbervars/3  occurs/2  previous/4  singletons/2  size/2  subsumes/2  subterm/2  update/3  update/4  update/5  valid/1  values/2  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also avltree, bintree, rbtree **object** #### `two3tree` 2-3 tree implementation. **Availability:** `logtalk_load(dictionaries(loader))` **Author:** Michael T. Richter **Version:** 1:0:1 **Date:** 2026-06-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` dictionaryp **Extends:** `public` term **Uses:** list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  apply/4  as_curly_bracketed/2  as_dictionary/2  as_list/2  check/1  clone/3  clone/4  delete/4  delete_max/4  delete_min/4  depth/2  empty/1  ground/1  insert/4  intersection/2  intersection/3  keys/2  lookup/2  lookup/3  lookup/4  map/2  map/3  max/3  min/3  new/1  next/4  numbervars/1  numbervars/3  occurs/2  previous/4  singletons/2  size/2  subsumes/2  subterm/2  update/3  update/4  update/5  valid/1  values/2  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `union/3` - Protected predicates - Private predicates - `union_impl/3` - `union_impl_list/3` - `clone_impl/3` - `clone_impl2/4` - `handle_root_underflow/2` - `delete_impl/5` - `fix_node2_left_underflow/6` - `fix_node2_right_underflow/6` - `fix_node3_left_underflow/9` - `fix_node3_middle_underflow/9` - `fix_node3_right_underflow/9` - `as_curly_bracketed_impl/2` - `as_curly_bracketed_impl/3` - `insert_impl/4` - `insert_empty/4` - `insert_node2_2/4` - `insert_node2_4/4` - `insert_node3_4/4` - `insert_node3_7/4` - `intersection_impl/4` - `is_node4/1` - `map_impl/2` - `map_impl/3` - `next_impl/5` - `previous_impl/5` - `node2_from_node4/2` - `update_impl/3` - `collect/4` - `select/4` - Operators ##### Public predicates ###### `union/3` Computes the union of two dictionaries. If a key appears in both, the value from the larger dictionary is kept. **Compilation flags:** `static` **Template:** `union(Tree1,Tree2,Union)` **Mode and number of proofs:** `union(+two3tree,+two3tree,-two3tree)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `union_impl/3` Inserts all key-value pairs of the smaller tree into the larger tree to compute the union. **Compilation flags:** `static` **Template:** `union_impl(LargerTree,SmallerTree,Union)` **Mode and number of proofs:** `union_impl(+two3tree,+two3tree,-two3tree)` - `zero_or_one` ------------------------------------------------------------------------ ###### `union_impl_list/3` Inserts a list of key-value pairs into a dictionary one by one. **Compilation flags:** `static` **Template:** `union_impl_list(Pairs,Dictionary,Union)` **Mode and number of proofs:** `union_impl_list(+list(pair),+two3tree,-two3tree)` - `zero_or_one` ------------------------------------------------------------------------ ###### `clone_impl/3` Recursively clones a tree, leaving all values unbound and collecting the pairs of the clone. **Compilation flags:** `static` **Template:** `clone_impl(Tree,Clone,ClonePairs)` **Mode and number of proofs:** `clone_impl(+two3tree,-two3tree,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `clone_impl2/4` Recursively clones a tree, returning both the original pairs and the clone pairs. **Compilation flags:** `static` **Template:** `clone_impl2(Tree,Clone,Pairs,ClonePairs)` **Mode and number of proofs:** `clone_impl2(+two3tree,-two3tree,-list(pair),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `handle_root_underflow/2` After a deletion, if the root has become a 2-node with a single child, replace it by that child; otherwise keep the root. **Compilation flags:** `static` **Template:** `handle_root_underflow(Tree,NewTree)` **Mode and number of proofs:** `handle_root_underflow(+term,-term)` - `one` ------------------------------------------------------------------------ ###### `delete_impl/5` Recursive deletion that returns the resulting tree and a flag indicating whether an underflow has occurred at the current node. **Compilation flags:** `static` **Template:** `delete_impl(Tree,Key,Value,NewTree,Underflow)` **Mode and number of proofs:** `delete_impl(+term,+term,?term,-term,-boolean)` - `zero_or_one` ------------------------------------------------------------------------ ###### `fix_node2_left_underflow/6` Repairs an underflow after a deletion in the left subtree of a node2. **Compilation flags:** `static` **Template:** `fix_node2_left_underflow(LeftSubtree,RightSubtree,Key,Value,NewTree,Underflow)` **Mode and number of proofs:** `fix_node2_left_underflow(+term,+term,+term,+term,-term,-boolean)` - `one` ------------------------------------------------------------------------ ###### `fix_node2_right_underflow/6` Repairs an underflow after a deletion in the right subtree of a node2. **Compilation flags:** `static` **Template:** `fix_node2_right_underflow(LeftSubtree,RightSubtree,Key,Value,NewTree,Underflow)` **Mode and number of proofs:** `fix_node2_right_underflow(+term,+term,+term,+term,-term,-boolean)` - `one` ------------------------------------------------------------------------ ###### `fix_node3_left_underflow/9` Repairs an underflow after a deletion in the left subtree of a node3. **Compilation flags:** `static` **Template:** `fix_node3_left_underflow(LeftSubtree,MiddleSubtree,RightSubtree,LeftKey,LeftValue,RightKey,RightValue,NewTree,Underflow)` **Mode and number of proofs:** `fix_node3_left_underflow(+term,+term,+term,+term,+term,+term,+term,-term,-boolean)` - `one` ------------------------------------------------------------------------ ###### `fix_node3_middle_underflow/9` Repairs an underflow after a deletion in the middle subtree of a node3. **Compilation flags:** `static` **Template:** `fix_node3_middle_underflow(LeftSubtree,MiddleSubtree,RightSubtree,LeftKey,LeftValue,RightKey,RightValue,NewTree,Underflow)` **Mode and number of proofs:** `fix_node3_middle_underflow(+term,+term,+term,+term,+term,+term,+term,-term,-boolean)` - `one` ------------------------------------------------------------------------ ###### `fix_node3_right_underflow/9` Repairs an underflow after a deletion in the right subtree of a node3. **Compilation flags:** `static` **Template:** `fix_node3_right_underflow(LeftSubtree,MiddleSubtree,RightSubtree,LeftKey,LeftValue,RightKey,RightValue,NewTree,Underflow)` **Mode and number of proofs:** `fix_node3_right_underflow(+term,+term,+term,+term,+term,+term,+term,-term,-boolean)` - `one` ------------------------------------------------------------------------ ###### `as_curly_bracketed_impl/2` Builds a curly-bracketed term from a list of key-value pairs. **Compilation flags:** `static` **Template:** `as_curly_bracketed_impl(Pairs,Term)` **Mode and number of proofs:** `as_curly_bracketed_impl(+list(pairs),-term)` - `one` ------------------------------------------------------------------------ ###### `as_curly_bracketed_impl/3` Helper that accumulates a comma-separated list inside curly braces. **Compilation flags:** `static` **Template:** `as_curly_bracketed_impl(Pairs,Pair,Term)` **Mode and number of proofs:** `as_curly_bracketed_impl(+list(pairs),+pair,-term)` - `one` ------------------------------------------------------------------------ ###### `insert_impl/4` Recursive insertion that may return a node4 on the way up. **Compilation flags:** `static` **Template:** `insert_impl(OldTree,Key,Value,NewTree)` **Mode and number of proofs:** `insert_impl(+term,+term,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `insert_empty/4` Inserts into an empty tree. **Compilation flags:** `static` **Template:** `insert_empty(EmptyTree,Key,Value,NewTree)` **Mode and number of proofs:** `insert_empty(+empty,+term,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `insert_node2_2/4` Inserts a key-value pair into a leaf 2-node, creating a leaf 3-node. **Compilation flags:** `static` **Template:** `insert_node2_2(Tree,Key,Value,NewTree)` **Mode and number of proofs:** `insert_node2_2(+term,+term,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `insert_node2_4/4` Inserts into a non-leaf 2-node, possibly splitting a child 4-node. **Compilation flags:** `static` **Template:** `insert_node2_4(Tree,Key,Value,NewTree)` **Mode and number of proofs:** `insert_node2_4(+term,+term,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `insert_node3_4/4` Inserts a key-value pair into a leaf 3-node, creating a leaf 4-node. **Compilation flags:** `static` **Template:** `insert_node3_4(Tree,Key,Value,NewTree)` **Mode and number of proofs:** `insert_node3_4(+term,+term,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `insert_node3_7/4` Inserts into a non-leaf 3-node, possibly splitting a child 4-node. **Compilation flags:** `static` **Template:** `insert_node3_7(Tree,Key,Value,NewTree)` **Mode and number of proofs:** `insert_node3_7(+term,+term,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `intersection_impl/4` Computes the intersection of a list of key-value pairs with a tree, inserting common pairs into an accumulator. **Compilation flags:** `static` **Template:** `intersection_impl(Pairs,Tree,Accumulator,Intersection)` **Mode and number of proofs:** `intersection_impl(+list(pair),+two3tree,+list(pair),-list(pair))` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_node4/1` True if the term is a 4-node (temporary representation). **Compilation flags:** `static` **Template:** `is_node4(Term)` **Mode and number of proofs:** `is_node4(+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `map_impl/2` Traverses the tree and applies a closure to each key-value pair. **Compilation flags:** `static` **Template:** `map_impl(Tree,Closure)` **Meta-predicate template:** `map_impl(*,1)` **Mode and number of proofs:** `map_impl(+two3tree,@callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map_impl/3` Traverses the tree, applies a closure to each key-value pair, and builds a new tree with the results. **Compilation flags:** `static` **Template:** `map_impl(OldTree,Closure,NewTree)` **Meta-predicate template:** `map_impl(*,2,*)` **Mode and number of proofs:** `map_impl(+two3tree,@callable,-two3tree)` - `zero_or_more` ------------------------------------------------------------------------ ###### `next_impl/5` Recursively finds the next key-value pair after a given key. **Compilation flags:** `static` **Template:** `next_impl(Tree,Key,NextKey,NextValue,Successor)` **Mode and number of proofs:** `next_impl(+two3tree,+key,-key,-value,+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_impl/5` Recursively finds the previous key-value pair before a given key. **Compilation flags:** `static` **Template:** `previous_impl(Tree,Key,PreviousKey,PreviousValue,Predecessor)` **Mode and number of proofs:** `previous_impl(+two3tree,+key,-key,-value,+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `node2_from_node4/2` Converts a 4-node (temporary) into a balanced 2-node with two 2-node children. **Compilation flags:** `static` **Template:** `node2_from_node4(Node4,Tree)` **Mode and number of proofs:** `node2_from_node4(+term,-term)` - `one` ------------------------------------------------------------------------ ###### `update_impl/3` Updates a dictionary with a list of key-value pairs sequentially. **Compilation flags:** `static` **Template:** `update_impl(Pairs,OldTree,NewTree)` **Mode and number of proofs:** `update_impl(@list(pair),+two3tree,-two3tree)` - `zero_or_one` ------------------------------------------------------------------------ ###### `collect/4` In-order traversal accumulating selected projections of nodes. **Compilation flags:** `static` **Template:** `collect(Tree,Selector,Accumulator,ReversedResult)` **Mode and number of proofs:** `collect(+two3tree,+selector,+list(term),-list(term))` - `one` ------------------------------------------------------------------------ ###### `select/4` Projects a key-value pair according to the selector. **Compilation flags:** `static` **Template:** `select(Selector,Key,Value,Element)` **Mode and number of proofs:** `select(+selector,+key,+value,-term)` - `one` ------------------------------------------------------------------------ ##### Operators (none) See also avltree, bintree, rbtree, splaytree, dictionaryp ### dif") **object** #### `dif` Provides dif/2 and derived predicates. **Availability:** `logtalk_load(dif(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2023-10-02 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Supported backend Prolog systems: B-Prolog, ECLiPSe, SICStus Prolog, SWI-Prolog, Trealla Prolog, and YAP. **Inherited public predicates:** (none) - Public predicates - `dif/2` - `dif/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `dif/2` Sets a constraint that is true iff the two terms are different. **Compilation flags:** `static` **Template:** `dif(Term1,Term2)` **Mode and number of proofs:** `dif(+term,+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `dif/1` Sets a set of constraints that are true iff all terms in a list are different. **Compilation flags:** `static` **Template:** `dif(Terms)` **Mode and number of proofs:** `dif(+list(term))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### dimension_reduction_protocols") **category** #### `dimension_reducer_common` Shared predicates for dimension reducer learning defaults, dataset helpers, transformation, export, and printing. **Availability:** `logtalk_load(dimension_reduction_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-07 **Compilation flags:** `static` **Implements:** `public` dimension_reducer_protocol **Extends:** `public` options **Uses:** format linear_algebra list numberlist population type user **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `check_component_count/3` - `dimension_reducer_data/3` - `dimension_reducer_diagnostics_data/2` - `print_dimension_reducer_properties/1` - `example_attribute_values/2` - `dataset_attributes/2` - `check_continuous_attributes/1` - `check_examples_non_empty/2` - `check_example_values/2` - `check_example_attributes/2` - `attribute_value/3` - `build_encoders/4` - `base_dimension_reducer_diagnostics/6` - `preprocessing_diagnostics/3` - `iterative_dimension_reducer_diagnostics/11` - `component_iteration_diagnostics/4` - `zero_vector_like/2` - `basis_vector/3` - `initial_vectors/2` - `basis_initial_vectors/3` - `extract_components/5` - `known_attribute_values/3` - `examples_to_rows/3` - `encode_instance/3` - `encoder_attribute_names/2` - `project_components/4` - `valid_linear_encoders/1` - `valid_projection_components/2` - `valid_dimension_reducer_metadata/1` - `print_dimension_reducer_details/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `check_component_count/3` Checks that a requested component count does not exceed the supported maximum and returns the accepted count. **Compilation flags:** `static` **Template:** `check_component_count(RequestedComponentCount,MaxComponentCount,ComponentCount)` **Mode and number of proofs:** `check_component_count(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `dimension_reducer_data/3` Default hook predicate for exposing the learned encoders and projection components from a reducer term. Importing implementations may override it when using a non-standard reducer representation. **Compilation flags:** `static` **Template:** `dimension_reducer_data(DimensionReducer,Encoders,Components)` **Mode and number of proofs:** `dimension_reducer_data(+compound,-list,-list)` - `one` ------------------------------------------------------------------------ ###### `dimension_reducer_diagnostics_data/2` Default hook predicate for exposing diagnostics metadata from a reducer term. Importing implementations may override it when using a non-standard reducer representation. **Compilation flags:** `static` **Template:** `dimension_reducer_diagnostics_data(DimensionReducer,Diagnostics)` **Mode and number of proofs:** `dimension_reducer_diagnostics_data(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `print_dimension_reducer_properties/1` Hook predicate that importing dimension reducer implementations must define in order to print the learned reducer in a human-readable form. **Compilation flags:** `static` **Template:** `print_dimension_reducer_properties(DimensionReducer)` **Mode and number of proofs:** `print_dimension_reducer_properties(+compound)` - `one` ------------------------------------------------------------------------ ###### `example_attribute_values/2` Hook predicate that importing dimension reducer implementations must define in order to extract example attribute values from their local training example representation. **Compilation flags:** `static` **Template:** `example_attribute_values(Example,AttributeValues)` **Mode and number of proofs:** `example_attribute_values(+compound,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `dataset_attributes/2` Collects the dataset attribute declarations as Attribute-Values pairs. **Compilation flags:** `static` **Template:** `dataset_attributes(Dataset,Attributes)` **Mode and number of proofs:** `dataset_attributes(+object_identifier,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `check_continuous_attributes/1` Checks that all declared dataset attributes are continuous. **Compilation flags:** `static` **Template:** `check_continuous_attributes(Attributes)` **Mode and number of proofs:** `check_continuous_attributes(+list(pair))` - `one` ------------------------------------------------------------------------ ###### `check_examples_non_empty/2` Checks that a training example collection is not empty. **Compilation flags:** `static` **Template:** `check_examples_non_empty(Dataset,Examples)` **Mode and number of proofs:** `check_examples_non_empty(+object_identifier,+list)` - `one` ------------------------------------------------------------------------ ###### `check_example_values/2` Checks that all example attribute values are present and numeric for the declared attributes. **Compilation flags:** `static` **Template:** `check_example_values(Examples,AttributeNames)` **Mode and number of proofs:** `check_example_values(+list,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `check_example_attributes/2` Checks that a single example contains numeric values for all declared attributes. **Compilation flags:** `static` **Template:** `check_example_attributes(AttributeNames,AttributeValues)` **Mode and number of proofs:** `check_example_attributes(+list(atom),+list(pair))` - `one` ------------------------------------------------------------------------ ###### `attribute_value/3` Looks up an attribute value in a list of Attribute-Value pairs. **Compilation flags:** `static` **Template:** `attribute_value(Attribute,AttributeValues,Value)` **Mode and number of proofs:** `attribute_value(+atom,+list(pair),-term)` - `one` ------------------------------------------------------------------------ ###### `build_encoders/4` Builds continuous feature encoders by computing per-attribute centering and optional scaling statistics. **Compilation flags:** `static` **Template:** `build_encoders(AttributeNames,Examples,Options,Encoders)` **Mode and number of proofs:** `build_encoders(+list(atom),+list,+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `base_dimension_reducer_diagnostics/6` Builds common diagnostics metadata terms for a learned reducer and appends reducer-specific diagnostics terms. **Compilation flags:** `static` **Template:** `base_dimension_reducer_diagnostics(Model,AttributeNames,Components,Options,ExtraDiagnostics,Diagnostics)` **Mode and number of proofs:** `base_dimension_reducer_diagnostics(+atom,+list(atom),+list,+list(compound),+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `preprocessing_diagnostics/3` Builds shared preprocessing diagnostics metadata from an explicit centering flag and the effective training options. **Compilation flags:** `static` **Template:** `preprocessing_diagnostics(Center,Options,Preprocessing)` **Mode and number of proofs:** `preprocessing_diagnostics(+boolean,+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `iterative_dimension_reducer_diagnostics/11` Builds diagnostics metadata for reducers that report sample counts, iterative convergence terms, and optional leading or trailing reducer-specific diagnostics. **Compilation flags:** `static` **Template:** `iterative_dimension_reducer_diagnostics(Model,AttributeNames,Components,SampleCount,Options,LeadingDiagnostics,Convergence,Iterations,FinalDelta,TrailingDiagnostics,Diagnostics)` **Mode and number of proofs:** `iterative_dimension_reducer_diagnostics(+atom,+list(atom),+list,+integer,+list(compound),+list(compound),+term,+term,+term,+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `component_iteration_diagnostics/4` Extracts per-component convergence, iteration, and final-delta lists from component diagnostics records. **Compilation flags:** `static` **Template:** `component_iteration_diagnostics(ComponentDiagnostics,Convergences,IterationCounts,FinalDeltas)` **Mode and number of proofs:** `component_iteration_diagnostics(+list(compound),-list(atom),-list(integer),-list(number))` - `one` ------------------------------------------------------------------------ ###### `zero_vector_like/2` Constructs a zero vector matching the length of the first vector in a list of vectors, or returns the empty list when the input is empty. **Compilation flags:** `static` **Template:** `zero_vector_like(Vectors,ZeroVector)` **Mode and number of proofs:** `zero_vector_like(+list(list(number)),-list(number))` - `one` ------------------------------------------------------------------------ ###### `basis_vector/3` Constructs a canonical basis vector for the requested size and one-based index. **Compilation flags:** `static` **Template:** `basis_vector(Size,Index,Vector)` **Mode and number of proofs:** `basis_vector(+integer,+integer,-list(number))` - `one` ------------------------------------------------------------------------ ###### `initial_vectors/2` Constructs the default all-ones initial vector followed by canonical basis vectors for the requested size. **Compilation flags:** `static` **Template:** `initial_vectors(Size,Vectors)` **Mode and number of proofs:** `initial_vectors(+integer,-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `basis_initial_vectors/3` Constructs canonical basis vectors from the given one-based index up to the requested size. **Compilation flags:** `static` **Template:** `basis_initial_vectors(Index,Size,Vectors)` **Mode and number of proofs:** `basis_initial_vectors(+integer,+integer,-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `extract_components/5` Extracts leading positive eigen-components from a numeric matrix using the shared symmetric eigensolver until the requested count or the configured tolerance is reached. **Compilation flags:** `static` **Template:** `extract_components(Matrix,Requested,Options,Components,Eigenvalues)` **Mode and number of proofs:** `extract_components(+list(list(number)),+integer,+list(compound),-list(list(number)),-list(number))` - `one` ------------------------------------------------------------------------ ###### `known_attribute_values/3` Collects the known numeric values for a given attribute across the training examples. **Compilation flags:** `static` **Template:** `known_attribute_values(Examples,Attribute,Values)` **Mode and number of proofs:** `known_attribute_values(+list,+atom,-list(number))` - `one` ------------------------------------------------------------------------ ###### `examples_to_rows/3` Encodes a list of training examples into numeric feature rows using the importing reducer example hook and learned encoders. **Compilation flags:** `static` **Template:** `examples_to_rows(Examples,Encoders,Rows)` **Mode and number of proofs:** `examples_to_rows(+list,+list(compound),-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `encode_instance/3` Encodes an instance using the learned continuous attribute encoders. **Compilation flags:** `static` **Template:** `encode_instance(Encoders,AttributeValues,Features)` **Mode and number of proofs:** `encode_instance(+list(compound),+list(pair),-list(number))` - `one` ------------------------------------------------------------------------ ###### `encoder_attribute_names/2` Collects encoder attribute names preserving encoder order. **Compilation flags:** `static` **Template:** `encoder_attribute_names(Encoders,AttributeNames)` **Mode and number of proofs:** `encoder_attribute_names(+list(compound),-list(atom))` - `one` ------------------------------------------------------------------------ ###### `project_components/4` Projects encoded features onto the learned components and returns component_N-Score pairs. **Compilation flags:** `static` **Template:** `project_components(Components,Features,Index,ReducedInstance)` **Mode and number of proofs:** `project_components(+list(list(number)),+list(number),+integer,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `valid_linear_encoders/1` True when a list of encoders only contains valid `continuous/3` encoder terms with distinct attributes. **Compilation flags:** `static` **Template:** `valid_linear_encoders(Encoders)` **Mode and number of proofs:** `valid_linear_encoders(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_projection_components/2` True when projection components are numeric vectors compatible with the encoder feature dimension. **Compilation flags:** `static` **Template:** `valid_projection_components(Encoders,Components)` **Mode and number of proofs:** `valid_projection_components(+list(compound),+list(list(number)))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_dimension_reducer_metadata/1` True when diagnostics metadata records the reducer model and effective training options. **Compilation flags:** `static` **Template:** `valid_dimension_reducer_metadata(Diagnostics)` **Mode and number of proofs:** `valid_dimension_reducer_metadata(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `print_dimension_reducer_details/3` Prints the common diagnostics, encoders, and component-count lines used by reducer-specific pretty printers. **Compilation flags:** `static` **Template:** `print_dimension_reducer_details(Diagnostics,Encoders,Components)` **Mode and number of proofs:** `print_dimension_reducer_details(+list(compound),+list(compound),+list)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `dimension_reducer_protocol` Protocol for machine learning dimension reducers. **Availability:** `logtalk_load(dimension_reduction_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-30 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `learn/3` - `learn/2` - `transform/3` - `check_dimension_reducer/1` - `valid_dimension_reducer/1` - `diagnostics/2` - `diagnostic/2` - `dimension_reducer_options/2` - `export_to_clauses/4` - `export_to_file/4` - `print_dimension_reducer/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `learn/3` Learns a dimension reducer from the given dataset object using the given options. **Compilation flags:** `static` **Template:** `learn(Dataset,DimensionReducer,Options)` **Mode and number of proofs:** `learn(+object_identifier,-compound,++list(compound))` - `one` ------------------------------------------------------------------------ ###### `learn/2` Learns a dimension reducer from the given dataset object using default options. **Compilation flags:** `static` **Template:** `learn(Dataset,DimensionReducer)` **Mode and number of proofs:** `learn(+object_identifier,-compound)` - `one` ------------------------------------------------------------------------ ###### `transform/3` Transforms a new instance into a reduced representation using the learned dimension reducer. The instance is a list of `Attribute-Value` pairs and the reduced representation is a list of `Component-Value` pairs. **Compilation flags:** `static` **Template:** `transform(DimensionReducer,Instance,ReducedInstance)` **Mode and number of proofs:** `transform(+compound,+list,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `check_dimension_reducer/1` Checks that a learned dimension reducer term is structurally valid for the receiving implementation. Throws an exception when the term is not a valid dimension reducer representation. **Compilation flags:** `static` **Template:** `check_dimension_reducer(DimensionReducer)` **Mode and number of proofs:** `check_dimension_reducer(@compound)` - `one_or_error` **Exceptions:** `DimensionReducer` is a variable: `instantiation_error` `DimensionReducer` is neither a variable nor a valid dimension reducer: `domain_error(dimension_reducer,DimensionReducer)` ------------------------------------------------------------------------ ###### `valid_dimension_reducer/1` True when a learned dimension reducer term is structurally valid for the receiving implementation. Succeeds iff `check_dimension_reducer/1` succeeds without throwing an exception. **Compilation flags:** `static` **Template:** `valid_dimension_reducer(DimensionReducer)` **Mode and number of proofs:** `valid_dimension_reducer(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `diagnostics/2` Returns diagnostics and metadata associated with a learned dimension reducer in a representation-independent way. **Compilation flags:** `static` **Template:** `diagnostics(DimensionReducer,Diagnostics)` **Mode and number of proofs:** `diagnostics(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostic/2` Tests or enumerates individual diagnostics metadata terms for a learned dimension reducer. **Compilation flags:** `static` **Template:** `diagnostic(DimensionReducer,Diagnostic)` **Mode and number of proofs:** `diagnostic(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `dimension_reducer_options/2` Returns the effective training options recorded in a learned dimension reducer diagnostics list. **Compilation flags:** `static` **Template:** `dimension_reducer_options(DimensionReducer,Options)` **Mode and number of proofs:** `dimension_reducer_options(+compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `export_to_clauses/4` Converts a dimension reducer into a list of predicate clauses. `Functor` is the functor for the generated single-argument predicate clauses whose argument is the serialized dimension reducer term. **Compilation flags:** `static` **Template:** `export_to_clauses(Dataset,DimensionReducer,Functor,Clauses)` **Mode and number of proofs:** `export_to_clauses(+object_identifier,+compound,+callable,-list(clause))` - `one` ------------------------------------------------------------------------ ###### `export_to_file/4` Exports a dimension reducer to a file. `Functor` is the functor for the generated single-argument predicate clauses whose argument is the serialized dimension reducer term. **Compilation flags:** `static` **Template:** `export_to_file(Dataset,DimensionReducer,Functor,File)` **Mode and number of proofs:** `export_to_file(+object_identifier,+compound,+callable,+atom)` - `one` ------------------------------------------------------------------------ ###### `print_dimension_reducer/1` Prints a dimension reducer to the current output stream in a human-readable format. **Compilation flags:** `static` **Template:** `print_dimension_reducer(DimensionReducer)` **Mode and number of proofs:** `print_dimension_reducer(+compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also dimension_reduction_dataset_protocol, supervised_dimension_reduction_dataset_protocol, target_supervised_dimension_reduction_dataset_protocol **protocol** #### `dimension_reduction_dataset_protocol` Protocol for datasets used with unsupervised dimension reduction algorithms. **Availability:** `logtalk_load(dimension_reduction_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-20 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `attribute_values/2` - `example/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `attribute_values/2` Enumerates by backtracking the attributes and their possible values. For discrete attributes, `Values` is a list of possible values. For continuous (numeric) attributes, `Values` is the atom `continuous`. **Compilation flags:** `static` **Template:** `attribute_values(Attribute,Values)` **Mode and number of proofs:** `attribute_values(?atom,-list(atom))` - `zero_or_more` `attribute_values(?atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `example/2` Enumerates by backtracking the examples in the dataset. Each example has an `Id` and a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `example(Id,AttributeValues)` **Mode and number of proofs:** `example(-integer,-list(pair))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `supervised_dimension_reduction_dataset_protocol` Protocol for labeled datasets used with supervised dimension reduction algorithms such as LDA. **Availability:** `logtalk_load(dimension_reduction_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-18 **Compilation flags:** `static` **Extends:** `public` dimension_reduction_dataset_protocol **Remarks:** (none) **Inherited public predicates:**  attribute_values/2  example/2 - Public predicates - `class/1` - `class_values/1` - `example/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `class/1` Returns the name of the target class attribute. **Compilation flags:** `static` **Template:** `class(Class)` **Mode and number of proofs:** `class(-atom)` - `one` ------------------------------------------------------------------------ ###### `class_values/1` Returns the list of possible values for the target class attribute. **Compilation flags:** `static` **Template:** `class_values(Values)` **Mode and number of proofs:** `class_values(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `example/3` Enumerates by backtracking the labeled examples in the dataset. Each example has an `Id`, a `Class` value, and a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `example(Id,Class,AttributeValues)` **Mode and number of proofs:** `example(-integer,-atom,-list(pair))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `target_supervised_dimension_reduction_dataset_protocol` Protocol for target-valued datasets used with supervised dimension reduction algorithms such as PLS projections. **Availability:** `logtalk_load(dimension_reduction_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-28 **Compilation flags:** `static` **Extends:** `public` dimension_reduction_dataset_protocol **Remarks:** (none) **Inherited public predicates:**  attribute_values/2  example/2 - Public predicates - `target/1` - `example/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `target/1` Returns the name of the numeric target attribute. **Compilation flags:** `static` **Template:** `target(Target)` **Mode and number of proofs:** `target(-atom)` - `one` ------------------------------------------------------------------------ ###### `example/3` Enumerates by backtracking the target-valued examples in the dataset. Each example has an `Id`, a numeric `Target` value, and a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `example(Id,Target,AttributeValues)` **Mode and number of proofs:** `example(-integer,-number,-list(pair))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### doclet") **object** #### `doclet` Utility object to help automate (re)generating documentation for a project. **Availability:** `logtalk_load(doclet(loader))` **Author:** Paulo Moura **Version:** 0:5:0 **Date:** 2017-01-05 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_tokens//2 **Uses:** logtalk os **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `update/0` - `doc_goal/1` - `shell_command/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `update/0` Updates the project documentation, first by calling a sequence of goals and second by executing a sequence of shell commands. Fails if any goal or shell command fails. **Compilation flags:** `static` **Mode and number of proofs:** `update` - `zero_or_one` ------------------------------------------------------------------------ ###### `doc_goal/1` Table of goals, typically using the `diagrams` and the `lgtdoc` tools, used to generate the documentation. Goals are called in the order they are defined and in the context of the `user` pseudo-object. **Compilation flags:** `static` **Template:** `doc_goal(Goal)` **Mode and number of proofs:** `doc_goal(?callable)` - `one_or_more` ------------------------------------------------------------------------ ###### `shell_command/1` Table of shell commands to convert intermediate documentation files into user-friendly documentation. Commands are executed in the order they are defined. **Compilation flags:** `static` **Template:** `shell_command(Command)` **Mode and number of proofs:** `shell_command(?atom)` - `one_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also lgtdocp, diagram(Format) ### eclat_pattern_miner") **object** #### `eclat_pattern_miner` Eclat frequent itemset miner for transaction datasets using portable vertical tidsets and depth-first recursive prefix extension. **Availability:** `logtalk_load(eclat_pattern_miner(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` frequent_pattern_mining_common **Uses:** avltree format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pattern_miner_protocol, transaction_dataset_protocol, apriori_pattern_miner, fp_growth_pattern_miner ### edcg") **object** #### `edcg` Multiple hidden parameters: an extension to Prolog’s DCG notation. Ported to Logtalk as a hook object. **Availability:** `logtalk_load(edcg(loader))` **Author:** Peter Van Roy; adapted to Logtalk by Paulo Moura. **Version:** 1:4:2 **Date:** 2020-04-08 **Copyright:** Copyright (C) 1992 Peter Van Roy **License:** MIT **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk **Remarks:** > - Usage: Compile source files with objects (or categories) defining EDCGs using the compiler option `hook(edcg)`. **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - `pred_info/3` - `acc_info/7` - `acc_info/5` - `pass_info/2` - `pass_info/1` - Operators - `op(1200,xfx,-->>)` ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `pred_info/3` Declares predicates that have the listed hidden parameters. **Compilation flags:** `dynamic` **Template:** `pred_info(Name,Arity,HiddenParameters)` **Mode and number of proofs:** `pred_info(?atom,?integer,?list(atom))` - `zero_or_more` ------------------------------------------------------------------------ ###### `acc_info/7` Long form for declaring accumulators. **Compilation flags:** `dynamic` **Template:** `acc_info(Accumulator,Term,Left,Right,Joiner,LStart,RStart)` **Mode and number of proofs:** `acc_info(?atom,?term,?term,?term,?callable,?term,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `acc_info/5` Short form for declaring accumulators. **Compilation flags:** `dynamic` **Template:** `acc_info(Accumulator,Term,Left,Right,Joiner)` **Mode and number of proofs:** `acc_info(?atom,?term,?term,?term,?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `pass_info/2` Long form for declaring passed arguments. Passed arguments are conceptually the same as accumulators with `=/2` as the joiner function. **Compilation flags:** `dynamic` **Template:** `pass_info(Argument,PStart)` **Mode and number of proofs:** `pass_info(?atom,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `pass_info/1` Short form for declaring passed arguments. Passed arguments are conceptually the same as accumulators with `=/2` as the joiner function. **Compilation flags:** `dynamic` **Template:** `pass_info(Argument)` **Mode and number of proofs:** `pass_info(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators ###### `op(1200,xfx,-->>)` **Scope:** `public` ### elastic_net_regression") **object** #### `elastic_net_regression` Elastic net regression regressor supporting continuous and mixed-feature datasets using coordinate descent with coefficient-wise L1 shrinkage plus L2 stabilization. Learns from a dataset object implementing the `regression_dataset_protocol` protocol and returns a regressor term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(elastic_net_regression(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-06-16 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** format list numberlist type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, ridge_regression, lasso_regression, knn_regression, regression_tree, random_forest_regression, gradient_boosting_regression ### elo_ranker") **object** #### `elo_ranker` Elo pairwise preference ranker. Learns one deterministic rating per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by replaying the observed preference stream using a deterministic batch Elo update rule, and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(elo_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common **Uses:** avltree **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, colley_ranker, rank_centrality ### events") **object** #### `after_event_registry` After events registry predicates. **Availability:** `logtalk_load(events(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2009-10-08 **Compilation flags:** `static,`` ``context_switching_calls,`` ``events` **Implements:** `public` event_registryp **Remarks:** (none) **Inherited public predicates:**  del_monitors/0  del_monitors/4  monitor/1  monitor/4  monitored/1  monitors/1  set_monitor/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also before_event_registry, monitorp **object** #### `before_event_registry` Before events registry predicates. **Availability:** `logtalk_load(events(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2009-10-08 **Compilation flags:** `static,`` ``context_switching_calls,`` ``events` **Implements:** `public` event_registryp **Remarks:** (none) **Inherited public predicates:**  del_monitors/0  del_monitors/4  monitor/1  monitor/4  monitored/1  monitors/1  set_monitor/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also after_event_registry, monitorp **object** #### `event_registry` Before and after events registry predicates. **Availability:** `logtalk_load(events(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2009-10-08 **Compilation flags:** `static,`` ``context_switching_calls,`` ``events` **Implements:** `public` event_registryp **Remarks:** (none) **Inherited public predicates:**  del_monitors/0  del_monitors/4  monitor/1  monitor/4  monitored/1  monitors/1  set_monitor/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `event_registryp` Event registry protocol. **Availability:** `logtalk_load(events(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2009-10-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `monitors/1` - `monitor/1` - `monitored/1` - `monitor/4` - `set_monitor/4` - `del_monitors/4` - `del_monitors/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `monitors/1` Returns a list of all current monitors. **Compilation flags:** `static` **Template:** `monitors(Monitors)` **Mode and number of proofs:** `monitors(-list(object_identifier))` - `one` ------------------------------------------------------------------------ ###### `monitor/1` Monitor is an object playing the role of a monitor. **Compilation flags:** `static` **Template:** `monitor(Monitor)` **Mode and number of proofs:** `monitor(-object_identifier)` - `zero_or_more` `monitor(+object_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `monitored/1` Returns a list of all currently monitored objects. **Compilation flags:** `static` **Template:** `monitored(Objects)` **Mode and number of proofs:** `monitored(-list(object_identifier))` - `one` ------------------------------------------------------------------------ ###### `monitor/4` True if the arguments describe a currently defined monitored event. **Compilation flags:** `static` **Template:** `monitor(Object,Message,Sender,Monitor)` **Mode and number of proofs:** `monitor(?object_identifier,?nonvar,?object_identifier,?object_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `set_monitor/4` Sets a monitor for the set of matching events. **Compilation flags:** `static` **Template:** `set_monitor(Object,Message,Sender,Monitor)` **Mode and number of proofs:** `set_monitor(?object_identifier,?nonvar,?object_identifier,+object_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `del_monitors/4` Deletes all matching monitored events. **Compilation flags:** `static` **Template:** `del_monitors(Object,Message,Sender,Monitor)` **Mode and number of proofs:** `del_monitors(?object_identifier,?nonvar,?object_identifier,?object_identifier)` - `one` ------------------------------------------------------------------------ ###### `del_monitors/0` Deletes all monitored events. **Compilation flags:** `static` **Mode and number of proofs:** `del_monitors` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also event_registry, monitorp **category** #### `monitor` Monitor predicates. **Availability:** `logtalk_load(events(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2019-03-08 **Compilation flags:** `static,`` ``events` **Implements:** `public` monitorp **Remarks:** (none) **Inherited public predicates:**  activate_monitor/0  del_spy_points/4  monitor_activated/0  reset_monitor/0  set_spy_point/4  spy_point/4  suspend_monitor/0 - Public predicates - Protected predicates - Private predicates - `spy_point_/4` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `spy_point_/4` Stores current spy points. **Compilation flags:** `dynamic` **Template:** `spy_point_(Event,Object,Message,Sender)` **Mode and number of proofs:** `spy_point_(?event,?object,?callable,?object)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `monitorp` Monitor protocol. **Availability:** `logtalk_load(events(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2000-07-24 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `monitor_activated/0` - `activate_monitor/0` - `suspend_monitor/0` - `reset_monitor/0` - `spy_point/4` - `set_spy_point/4` - `del_spy_points/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `monitor_activated/0` True if monitor is currently active. **Compilation flags:** `static` **Mode and number of proofs:** `monitor_activated` - `zero_or_one` ------------------------------------------------------------------------ ###### `activate_monitor/0` Activates all spy points and start monitoring. **Compilation flags:** `static` **Mode and number of proofs:** `activate_monitor` - `one` ------------------------------------------------------------------------ ###### `suspend_monitor/0` Suspends monitoring, deactivating all spy points. **Compilation flags:** `static` **Mode and number of proofs:** `suspend_monitor` - `one` ------------------------------------------------------------------------ ###### `reset_monitor/0` Resets monitor, deactivating and deleting all spy points. **Compilation flags:** `static` **Mode and number of proofs:** `reset_monitor` - `one` ------------------------------------------------------------------------ ###### `spy_point/4` Current spy point. **Compilation flags:** `static` **Template:** `spy_point(Event,Object,Message,Sender)` **Mode and number of proofs:** `spy_point(?event,?object,?callable,?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `set_spy_point/4` Sets a spy point. **Compilation flags:** `static` **Template:** `set_spy_point(Event,Object,Message,Sender)` **Mode and number of proofs:** `set_spy_point(?event,?object,?callable,?object)` - `one` ------------------------------------------------------------------------ ###### `del_spy_points/4` Deletes all matching spy points. **Compilation flags:** `static` **Template:** `del_spy_points(Event,Object,Message,Sender)` **Mode and number of proofs:** `del_spy_points(@event,@object,@callable,@object)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also monitor, event_registryp ### ewma_anomaly_detector") **object** #### `ewma_anomaly_detector` EWMA (Exponentially Weighted Moving Average) anomaly detector for continuous sequence-like datasets. Learns per-step population mean and standard deviation from baseline training examples selected from a dataset object implementing the `anomaly_dataset_protocol` protocol and returns a detector term that can be used for scoring, prediction, and export. **Availability:** `logtalk_load(ewma_anomaly_detector(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` anomaly_detector_common **Uses:** format list pairs population type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  score/3  score_all/3  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_protocol, cusum_anomaly_detector, isolation_forest_anomaly_detector, knn_distance_anomaly_detector, lof_anomaly_detector, modified_z_score_anomaly_detector, z_score_anomaly_detector ### expand_library_alias_paths") **object** #### `expand_library_alias_paths` Hook object for expanding library alias paths in `logtalk_library_path/2` facts when compiling a source file. **Availability:** `logtalk_load(expand_library_alias_paths(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2018-04-12 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Uses:** logtalk os **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### expecteds") **object** #### `either` Types and predicates for extended type-checking and handling of expected terms. **Availability:** `logtalk_load(expecteds(loader))` **Author:** Paulo Moura **Version:** 0:9:0 **Date:** 2025-06-19 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** type::type/1 type::check/2 arbitrary::arbitrary/1 arbitrary::arbitrary/2 arbitrary::shrinker/1 arbitrary::shrink/3 arbitrary::edge_case/2 **Uses:** expected expected(Expected) random type **Remarks:** > - Type-checking support: Defines a `either(ValueType,`` ``ErrorType)` type for checking expected terms where the value and error terms must be of the given types. > > - QuickCheck support: Defines clauses for the `type::arbitrary/1-2`, `arbitrary::shrinker/1`, `arbitrary::shrink/3`, and `arbitrary::edge_case/2` predicates to allow generating random values for the `either(ValueType,`` ``ErrorType)` type. **Inherited public predicates:** (none) - Public predicates - `expecteds/2` - `unexpecteds/2` - `partition/3` - `sequence/2` - `traverse/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `expecteds/2` Returns the values stored in the expected terms that hold a value. **Compilation flags:** `static` **Template:** `expecteds(Expecteds,Values)` **Mode and number of proofs:** `expecteds(+list(expected),-list)` - `one` ------------------------------------------------------------------------ ###### `unexpecteds/2` Returns the errors stored in the expected terms that hold an error. **Compilation flags:** `static` **Template:** `unexpecteds(Expecteds,Errors)` **Mode and number of proofs:** `unexpecteds(+list(expected),-list)` - `one` ------------------------------------------------------------------------ ###### `partition/3` Retrieves and partitions the values and errors hold by the expected terms. **Compilation flags:** `static` **Template:** `partition(Expecteds,Values,Errors)` **Mode and number of proofs:** `partition(+list(expected),-list,-list)` - `one` ------------------------------------------------------------------------ ###### `sequence/2` Returns an expected term with a list of all values when all expected terms hold values. Otherwise returns the first expected term holding an error. **Compilation flags:** `static` **Template:** `sequence(Expecteds,Expected)` **Mode and number of proofs:** `sequence(+list(expected),--nonvar)` - `one` ------------------------------------------------------------------------ ###### `traverse/3` Applies a closure to each list element to generate expected terms and then sequences them into a single expected term holding all values or the first error. **Compilation flags:** `static` **Template:** `traverse(Closure,Terms,Expected)` **Meta-predicate template:** `traverse(2,*,*)` **Mode and number of proofs:** `traverse(+callable,+list,--nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also expected, expected(Expected), type, arbitrary **object** #### `expected` Constructors for expected terms. An expected term contains either a value or an error. Expected terms should be regarded as opaque terms and always used with the `expected/1` object by passing the expected term as a parameter. **Availability:** `logtalk_load(expecteds(loader))` **Author:** Paulo Moura **Version:** 2:2:0 **Date:** 2026-02-21 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** type::type/1 type::check/2 **Remarks:** > - Type-checking support: This object also defines a type `expected` for use with the `type` library object. **Inherited public predicates:** (none) - Public predicates - `of_unexpected/2` - `of_expected/2` - `from_goal/4` - `from_goal/3` - `from_goal/2` - `from_generator/4` - `from_generator/3` - `from_generator/2` - `from_optional/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `of_unexpected/2` Constructs an expected term from an error that represent that the expected value is missing. **Compilation flags:** `static` **Template:** `of_unexpected(Error,Expected)` **Mode and number of proofs:** `of_unexpected(@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `of_expected/2` Constructs an expected term from an expected value. **Compilation flags:** `static` **Template:** `of_expected(Value,Expected)` **Mode and number of proofs:** `of_expected(@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_goal/4` Constructs an expected term holding a value bound by calling the given goal. Otherwise returns an expected term with the unexpected goal error or failure represented by the `Error` argument. **Compilation flags:** `static` **Template:** `from_goal(Goal,Value,Error,Expected)` **Meta-predicate template:** `from_goal(0,*,*,*)` **Mode and number of proofs:** `from_goal(+callable,--term,@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_goal/3` Constructs an expected term holding a value bound by calling the given goal. Otherwise returns an expected term with the unexpected goal error or the atom `fail` representing the unexpected failure. **Compilation flags:** `static` **Template:** `from_goal(Goal,Value,Expected)` **Meta-predicate template:** `from_goal(0,*,*)` **Mode and number of proofs:** `from_goal(+callable,--term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_goal/2` Constructs an expected term holding a value bound by calling the given closure. Otherwise returns an expected term holding the unexpected closure error or the atom `fail` representing the unexpected failure. **Compilation flags:** `static` **Template:** `from_goal(Closure,Expected)` **Meta-predicate template:** `from_goal(1,*)` **Mode and number of proofs:** `from_goal(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_generator/4` Constructs expected terms with the values generated by calling the given goal. On goal error or failure, returns an expected term with the unexpected goal error or failure represented by the `Error` argument. **Compilation flags:** `static` **Template:** `from_generator(Goal,Value,Error,Expected)` **Meta-predicate template:** `from_generator(0,*,*,*)` **Mode and number of proofs:** `from_generator(+callable,--term,@term,--nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `from_generator/3` Constructs expected terms with the values generated by calling the given goal. On goal error or failure, returns an expected term with, respectively, the unexpected goal error or the atom `fail` representing the unexpected goal failure. **Compilation flags:** `static` **Template:** `from_generator(Goal,Value,Expected)` **Meta-predicate template:** `from_generator(0,*,*)` **Mode and number of proofs:** `from_generator(+callable,--term,--nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `from_generator/2` Constructs expected terms with the values generated by calling the given closure. On closure error or failure, returns an expected term with, respectively, the unexpected closure error or the atom `fail` representing the unexpected closure failure. **Compilation flags:** `static` **Template:** `from_generator(Closure,Expected)` **Meta-predicate template:** `from_generator(1,*)` **Mode and number of proofs:** `from_generator(+callable,--nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `from_optional/3` Converts an optional term to an expected term. Returns an expected term holding the value if the optional term is not empty. Returns an expected term with the given error otherwise. **Compilation flags:** `static` **Template:** `from_optional(Optional,Error,Expected)` **Mode and number of proofs:** `from_optional(+nonvar,@term,--nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also expected(Expected), type **object** #### `expected(Expected)` Expected term predicates. Requires passing an expected term (constructed using the `expected` object predicates) as a parameter. **Availability:** `logtalk_load(expecteds(loader))` **Author:** Paulo Moura **Version:** 1:6:0 **Date:** 2026-02-21 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `is_expected/0` - `is_unexpected/0` - `if_expected/1` - `if_unexpected/1` - `if_expected_or_else/2` - `unexpected/1` - `expected/1` - `map/2` - `flat_map/2` - `either/3` - `or_else/2` - `or_else_get/2` - `or_else_call/2` - `or_else_throw/1` - `or_else_fail/1` - `filter/3` - `map_unexpected/2` - `map_catching/2` - `map_both/3` - `swap/1` - `map_or_else/3` - `or/2` - `or_else_throw/2` - `zip/3` - `to_optional/1` - `flatten/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `is_expected/0` True if the expected term holds a value. See also the `if_expected/1` predicate. **Compilation flags:** `static` **Mode and number of proofs:** `is_expected` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_unexpected/0` True if the expected term holds an error. See also the `if_unexpected/1` predicate. **Compilation flags:** `static` **Mode and number of proofs:** `is_unexpected` - `zero_or_one` ------------------------------------------------------------------------ ###### `if_expected/1` Applies a closure when the expected term holds a value using the value as argument. Succeeds otherwise. **Compilation flags:** `static` **Template:** `if_expected(Closure)` **Meta-predicate template:** `if_expected(1)` **Mode and number of proofs:** `if_expected(+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `if_unexpected/1` Applies a closure when the expected term holds an error using the error as argument. Succeeds otherwise. Can be used to throw the exception hold by the expected term by calling it the atom `throw`. **Compilation flags:** `static` **Template:** `if_unexpected(Closure)` **Meta-predicate template:** `if_unexpected(1)` **Mode and number of proofs:** `if_unexpected(+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `if_expected_or_else/2` Applies either `ExpectedClosure` or `UnexpectedClosure` depending on the expected term holding a value or an error. **Compilation flags:** `static` **Template:** `if_expected_or_else(ExpectedClosure,UnexpectedClosure)` **Meta-predicate template:** `if_expected_or_else(1,1)` **Mode and number of proofs:** `if_expected_or_else(+callable,+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `unexpected/1` Returns the error hold by the expected term. Throws an error otherwise. **Compilation flags:** `static` **Template:** `unexpected(Error)` **Mode and number of proofs:** `unexpected(--term)` - `one_or_error` **Exceptions:** Expected term holds a value: `existence_error(unexpected_error,Expected)` ------------------------------------------------------------------------ ###### `expected/1` Returns the value hold by the expected term. Throws an error otherwise. **Compilation flags:** `static` **Template:** `expected(Value)` **Mode and number of proofs:** `expected(--term)` - `one_or_error` **Exceptions:** Expected term holds an error: `existence_error(expected_value,Expected)` ------------------------------------------------------------------------ ###### `map/2` When the expected term does not hold an error and mapping a closure with the expected value and the new value as additional arguments is successful, returns an expected term with the new value. Otherwise returns the same expected term. **Compilation flags:** `static` **Template:** `map(Closure,NewExpected)` **Meta-predicate template:** `map(2,*)` **Mode and number of proofs:** `map(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `flat_map/2` When the expected term does not hold an error and mapping a closure with the expected value and the new expected term as additional arguments is successful, returns the new expected term. Otherwise returns the same expected term. **Compilation flags:** `static` **Template:** `flat_map(Closure,NewExpected)` **Meta-predicate template:** `flat_map(2,*)` **Mode and number of proofs:** `flat_map(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `either/3` Applies either `ExpectedClosure` if the expected term holds a value or `UnexpectedClosure` if the expected term holds an error. Returns a new expected term if the applied closure is successful. Otherwise returns the same expected term. **Compilation flags:** `static` **Template:** `either(ExpectedClosure,UnexpectedClosure,NewExpected)` **Meta-predicate template:** `either(2,2,*)` **Mode and number of proofs:** `either(+callable,+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `or_else/2` Returns the value hold by the expected term if it does not hold an error or the given default term if the expected term holds an error. **Compilation flags:** `static` **Template:** `or_else(Value,Default)` **Mode and number of proofs:** `or_else(--term,@term)` - `one` ------------------------------------------------------------------------ ###### `or_else_get/2` Returns the value hold by the expected term if it does not hold an error. Otherwise applies a closure to compute the expected value. Throws an error when the expected term holds an error and a value cannot be computed. **Compilation flags:** `static` **Template:** `or_else_get(Value,Closure)` **Meta-predicate template:** `or_else_get(*,1)` **Mode and number of proofs:** `or_else_get(--term,+callable)` - `one_or_error` **Exceptions:** Expected term holds an unexpected error and an expected value cannot be computed: `existence_error(expected_value,Expected)` ------------------------------------------------------------------------ ###### `or_else_call/2` Returns the value hold by the expected term if it does not hold an error. Calls a goal deterministically otherwise. **Compilation flags:** `static` **Template:** `or_else_call(Value,Goal)` **Meta-predicate template:** `or_else_call(*,0)` **Mode and number of proofs:** `or_else_call(--term,+callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `or_else_throw/1` Returns the value hold by the expected term if present. Throws the error hold by the expected term as an exception otherwise. **Compilation flags:** `static` **Template:** `or_else_throw(Value)` **Mode and number of proofs:** `or_else_throw(--term)` - `one_or_error` ------------------------------------------------------------------------ ###### `or_else_fail/1` Returns the value hold by the expected term if it does not hold an error. Fails otherwise. Usually called to skip over expected terms holding errors. **Compilation flags:** `static` **Template:** `or_else_fail(Value)` **Mode and number of proofs:** `or_else_fail(--term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `filter/3` When the expected term holds a value and the value satisfies the closure, returns the same expected term. When the expected term holds a value that does not satisfy the closure, returns an expected term with the given error. When the expected term holds an error, returns the same expected term. **Compilation flags:** `static` **Template:** `filter(Closure,Error,NewExpected)` **Meta-predicate template:** `filter(1,*,*)` **Mode and number of proofs:** `filter(+callable,@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map_unexpected/2` When the expected term holds an error and mapping a closure with the error and the new error as additional arguments is successful, returns an expected term with the new error. Otherwise returns the same expected term. **Compilation flags:** `static` **Template:** `map_unexpected(Closure,NewExpected)` **Meta-predicate template:** `map_unexpected(2,*)` **Mode and number of proofs:** `map_unexpected(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map_catching/2` When the expected term holds a value, applies a closure to it. Returns an expected term with the new value if the closure succeeds. Returns an expected term with the error if the closure throws an error. Returns an expected term with the atom `fail` as error if the closure fails. When the expected term holds an error, returns the same expected term. **Compilation flags:** `static` **Template:** `map_catching(Closure,NewExpected)` **Meta-predicate template:** `map_catching(2,*)` **Mode and number of proofs:** `map_catching(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map_both/3` When the expected term holds a value and mapping `ExpectedClosure` with the value is successful, returns an expected term with the new value. When the expected term holds an error and mapping `UnexpectedClosure` with the error is successful, returns an expected term with the new error. Otherwise returns the same expected term. **Compilation flags:** `static` **Template:** `map_both(ExpectedClosure,UnexpectedClosure,NewExpected)` **Meta-predicate template:** `map_both(2,2,*)` **Mode and number of proofs:** `map_both(+callable,+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `swap/1` Swaps the expected and unexpected terms. If the expected term holds a value, returns an unexpected term with that value. If the expected term holds an error, returns an expected term with that error. **Compilation flags:** `static` **Template:** `swap(NewExpected)` **Mode and number of proofs:** `swap(--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map_or_else/3` When the expected term holds a value and mapping a closure with the value and the new value as additional arguments is successful, returns the new value. Otherwise returns the given default value. **Compilation flags:** `static` **Template:** `map_or_else(Closure,Default,Value)` **Meta-predicate template:** `map_or_else(2,*,*)` **Mode and number of proofs:** `map_or_else(+callable,@term,--term)` - `one` ------------------------------------------------------------------------ ###### `or/2` Returns the same expected term if it holds a value. Otherwise calls closure to generate a new expected term. Fails if the expected term holds an error and calling the closure fails or throws an error. **Compilation flags:** `static` **Template:** `or(NewExpected,Closure)` **Meta-predicate template:** `or(*,1)` **Mode and number of proofs:** `or(--term,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `or_else_throw/2` Returns the value hold by the expected term if present. Throws the given error otherwise, ignoring any error hold by the expected term. **Compilation flags:** `static` **Template:** `or_else_throw(Value,Error)` **Mode and number of proofs:** `or_else_throw(--term,@nonvar)` - `one_or_error` ------------------------------------------------------------------------ ###### `zip/3` When both this expected and the other expected hold values and applying a closure with both values and the new value as additional arguments is successful, returns an expected term with the new value. Otherwise returns the first expected term that holds an error. **Compilation flags:** `static` **Template:** `zip(Closure,OtherExpected,NewExpected)` **Meta-predicate template:** `zip(3,*,*)` **Mode and number of proofs:** `zip(+callable,+nonvar,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `to_optional/1` Converts the expected term to an optional term. Returns a non-empty optional term holding the value if the expected term holds a value. Returns an empty optional term if the expected term holds an error. **Compilation flags:** `static` **Template:** `to_optional(Optional)` **Mode and number of proofs:** `to_optional(--nonvar)` - `one` ------------------------------------------------------------------------ ###### `flatten/1` Flattens a nested expected term. When the expected term holds a value that is itself an expected term, returns the inner expected term. When the expected term holds a non-expected value, returns the same expected term. When the expected term holds an error, returns the same expected term. **Compilation flags:** `static` **Template:** `flatten(NewExpected)` **Mode and number of proofs:** `flatten(--nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also expected ### fcube") **object** #### `fcube` FCube: An Efficient Prover for Intuitionistic Propositional Logic. **Availability:** `logtalk_load(fcube(loader))` **Author:** Mauro Ferrari, Camillo Fiorentini, Guido Fiorino; ported to Logtalk by Paulo Moura. **Version:** 5:0:1 **Date:** 2024-03-14 **Copyright:** Copyright 2012 Mauro Ferrari, Camillo Fiorentini, Guido Fiorino; Copyright 2020-2024 Paulo Moura **License:** GPL-2.0-or-later **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** integer list os set user **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `gnu/0` - `fcube/0` - `decide/1` - `decide/2` - Protected predicates - Private predicates - Operators - `op(1200,xfy,<=>)` - `op(1110,xfy,=>)` - `op(1000,xfy,&&)` - `op(500,fy,~)` - `op(1100,xfy,v)` ##### Public predicates ###### `gnu/0` Prints banner with copyright and license information. **Compilation flags:** `static` **Mode and number of proofs:** `gnu` - `one` ------------------------------------------------------------------------ ###### `fcube/0` Reads a formula and applies the prover to it, printing its counter-model. **Compilation flags:** `static` **Mode and number of proofs:** `fcube` - `one` ------------------------------------------------------------------------ ###### `decide/1` Applies the prover to the given formula and prints its counter-model. **Compilation flags:** `static` **Template:** `decide(Formula)` **Mode and number of proofs:** `decide(++compound)` - `one` ------------------------------------------------------------------------ ###### `decide/2` Applies the prover to the given formula and returns its counter-model. **Compilation flags:** `static` **Template:** `decide(Formula,CounterModel)` **Mode and number of proofs:** `decide(++compound,--compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators ###### `op(1200,xfy,<=>)` **Scope:** `public` ###### `op(1110,xfy,=>)` **Scope:** `public` ###### `op(1000,xfy,&&)` **Scope:** `public` ###### `op(500,fy,~)` **Scope:** `public` ###### `op(1100,xfy,v)` **Scope:** `public` ### flags") **category** #### `flags` Implementation of persistent object flags. **Availability:** `logtalk_load(flags(loader))` **Author:** Theofrastos Mantadelis **Version:** 1:0:0 **Date:** 2010-11-27 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `get_flag_value/2` - `set_flag_value/2` - `set_flag_value/3` - `reset_flags/0` - `reset_flags/1` - `flag_groups/1` - `flag_group_chk/1` - `print_flags/0` - `print_flags/1` - `defined_flag/6` - `built_in_flag/2` - Protected predicates - `unsafe_set_flag_value/2` - `define_flag/1` - `define_flag/2` - Private predicates - `defined_flag_/6` - `flag_value_/2` - `validate/3` - `validate_type/1` - `is_validator/1` - Operators ##### Public predicates ###### `get_flag_value/2` Gets or tests the value of a flag. **Compilation flags:** `static` **Template:** `get_flag_value(Flag,Value)` **Mode and number of proofs:** `get_flag_value(+atom,?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `set_flag_value/2` Sets the value of a flag. **Compilation flags:** `static` **Template:** `set_flag_value(Flag,NewValue)` **Mode and number of proofs:** `set_flag_value(+atom,@nonvar)` - `one` ------------------------------------------------------------------------ ###### `set_flag_value/3` Sets the value of a flag, returning the old value. **Compilation flags:** `static` **Template:** `set_flag_value(Flag,OldValue,NewValue)` **Mode and number of proofs:** `set_flag_value(+atom,?nonvar,@nonvar)` - `one` ------------------------------------------------------------------------ ###### `reset_flags/0` Resets all flags to their default values. **Compilation flags:** `static` **Mode and number of proofs:** `reset_flags` - `one` ------------------------------------------------------------------------ ###### `reset_flags/1` Resets all flags in a group to their default values. **Compilation flags:** `static` **Template:** `reset_flags(Group)` **Mode and number of proofs:** `reset_flags(+atom)` - `one` ------------------------------------------------------------------------ ###### `flag_groups/1` Returns a list of all flag groups. **Compilation flags:** `static` **Template:** `flag_groups(Groups)` **Mode and number of proofs:** `flag_groups(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `flag_group_chk/1` Checks if a given atom is a flag group. **Compilation flags:** `static` **Template:** `flag_group_chk(Group)` **Mode and number of proofs:** `flag_group_chk(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `print_flags/0` Prints a listing of all flags. **Compilation flags:** `static` **Mode and number of proofs:** `print_flags` - `one` ------------------------------------------------------------------------ ###### `print_flags/1` Prints a listing of all flags in a group. **Compilation flags:** `static` **Template:** `print_flags(Group)` **Mode and number of proofs:** `print_flags(+atom)` - `one` ------------------------------------------------------------------------ ###### `defined_flag/6` Gets or test the existing (visible) flag definitions. **Compilation flags:** `static` **Template:** `defined_flag(Flag,Group,Type,DefaultValue,Description,Access)` **Mode and number of proofs:** `defined_flag(?atom,?atom,?nonvar,?nonvar,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `built_in_flag/2` True if the argument is a built-in flag type with the specified default value. **Compilation flags:** `static` **Template:** `built_in_flag(Type,DefaultValue)` **Mode and number of proofs:** `built_in_flag(?atom,?nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates ###### `unsafe_set_flag_value/2` Sets the value of a flag without performing any validation checks. **Compilation flags:** `static` **Template:** `unsafe_set_flag_value(Flag,NewValue)` **Mode and number of proofs:** `unsafe_set_flag_value(+atom,@nonvar)` - `one` ------------------------------------------------------------------------ ###### `define_flag/1` Defines a new flag using default options. **Compilation flags:** `static` **Template:** `define_flag(Flag)` **Mode and number of proofs:** `define_flag(+atom)` - `one` ------------------------------------------------------------------------ ###### `define_flag/2` Defines a new flag using a given set of options (for example, \[group(general), type(nonvar), default(true), description(Flag), access(read_write)\]). **Compilation flags:** `static` **Template:** `define_flag(Flag,Options)` **Mode and number of proofs:** `define_flag(+atom,@list)` - `one` ------------------------------------------------------------------------ ##### Private predicates ###### `defined_flag_/6` Gets or test the existing flag definitions. **Compilation flags:** `dynamic` **Template:** `defined_flag_(Flag,Group,Type,DefaultValue,Description,Access)` **Mode and number of proofs:** `defined_flag_(?atom,?atom,?nonvar,?nonvar,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `flag_value_/2` Table of flag values. **Compilation flags:** `dynamic` **Template:** `flag_value_(Flag,Value)` **Mode and number of proofs:** `flag_value_(?atom,?nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ###### `validate/3` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `validate_type/1` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `is_validator/1` **Compilation flags:** `static` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `flags_validator` Flag validation protocol. Must be implemented by validator objects. **Availability:** `logtalk_load(flags(loader))` **Author:** Theofrastos Mantadelis **Version:** 1:0:0 **Date:** 2010-11-27 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `print_flags/0` - `validate/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `print_flags/0` Validates the validator object itself. **Compilation flags:** `static` **Mode and number of proofs:** `print_flags` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate/1` Validates a flag value. **Compilation flags:** `static` **Template:** `validate(Value)` **Mode and number of proofs:** `validate(@term)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### format") **object** #### `format` Formatted output predicates. **Availability:** `logtalk_load(format(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2025-11-18 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `format/3` - `format/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `format/3` Writes a list of arguments after a format specification to the specified output stream. **Compilation flags:** `static` **Template:** `format(Stream,Format,Arguments)` **Mode and number of proofs:** `format(@stream_or_alias,+atom,@list)` - `zero_or_one` `format(@stream_or_alias,+list(character_code),@list)` - `zero_or_one` `format(@stream_or_alias,+list(character),@list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `format/2` Writes a list of arguments after a format specification to the current output stream. **Compilation flags:** `static` **Template:** `format(Format,Arguments)` **Mode and number of proofs:** `format(+atom,@list)` - `zero_or_one` `format(+list(character_code),@list)` - `zero_or_one` `format(+list(character),@list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### fp_growth_pattern_miner") **object** #### `fp_growth_pattern_miner` FP-growth frequent itemset miner for transaction datasets using recursive conditional pattern-base projection over an FP-tree with header-table and parent-link navigation. **Availability:** `logtalk_load(fp_growth_pattern_miner(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-20 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` frequent_pattern_mining_common **Uses:** format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pattern_miner_protocol, transaction_dataset_protocol, apriori_pattern_miner ### frequent_pattern_mining_protocols") **category** #### `frequent_pattern_mining_common` Shared predicates for frequent itemset miner dataset validation, support accumulation, and itemset ordering/filtering helpers. **Availability:** `logtalk_load(frequent_pattern_mining_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-29 **Compilation flags:** `static` **Extends:** `public` pattern_miner_common **Uses:** list type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - `check_transactions/4` - `sort_patterns/2` - `filter_patterns/3` - `count_items/4` - `select_frequent_item_supports/3` - `valid_itemset_patterns/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `check_transactions/4` Validates the collected dataset transactions and returns the maximum transaction length. **Compilation flags:** `static` **Template:** `check_transactions(Dataset,ItemDomain,Transactions,MaxTransactionLength)` **Mode and number of proofs:** `check_transactions(+object_identifier,+list(atom),+list(pair(integer,list(atom))),-integer)` - `one` ------------------------------------------------------------------------ ###### `sort_patterns/2` Sorts itemset patterns first by pattern length and then lexicographically. **Compilation flags:** `static` **Template:** `sort_patterns(Patterns0,Patterns)` **Mode and number of proofs:** `sort_patterns(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `filter_patterns/3` Filters itemset patterns by minimum pattern length. **Compilation flags:** `static` **Template:** `filter_patterns(Patterns0,MinimumPatternLength,Patterns)` **Mode and number of proofs:** `filter_patterns(+list(compound),+integer,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `count_items/4` Accumulates support counts for a list of items. **Compilation flags:** `static` **Template:** `count_items(Items,Count,ItemCounts0,ItemCounts)` **Mode and number of proofs:** `count_items(+list(atom),+integer,+list(pair(atom,integer)),-list(pair(atom,integer)))` - `one` ------------------------------------------------------------------------ ###### `select_frequent_item_supports/3` Selects the item supports that satisfy the minimum support count. **Compilation flags:** `static` **Template:** `select_frequent_item_supports(ItemCounts,SupportCount,FrequentItemSupports)` **Mode and number of proofs:** `select_frequent_item_supports(+list(pair(atom,integer)),+integer,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `valid_itemset_patterns/2` True when the patterns are valid `itemset(Items,`` ``Support)` terms over the given item domain with positive integer supports. **Compilation flags:** `static` **Template:** `valid_itemset_patterns(ItemDomain,Patterns)` **Mode and number of proofs:** `valid_itemset_patterns(+list(atom),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `transaction_dataset_protocol` Protocol for transaction datasets used with frequent itemset mining algorithms. Transaction identifiers are expected to be unique within a dataset. **Availability:** `logtalk_load(frequent_pattern_mining_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-29 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `items/1` - `transaction/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `items/1` Returns the declared transaction item domain as a canonical sorted list of unique items. **Compilation flags:** `static` **Template:** `items(Items)` **Mode and number of proofs:** `items(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `transaction/2` Enumerates by backtracking the transactions in the dataset. The transaction identifier is expected to be unique within the dataset. Each transaction is represented as a canonical sorted list of unique declared items. **Compilation flags:** `static` **Template:** `transaction(Id,Transaction)` **Mode and number of proofs:** `transaction(-integer,-list(atom))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### gaussian_mixture_clusterer") **object** #### `gaussian_mixture_clusterer` Gaussian mixture model clusterer for continuous datasets. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(gaussian_mixture_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** format list numberlist pairs population type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - `cluster_probabilities/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `cluster_probabilities/3` Returns posterior component probabilities for a new instance as `Cluster-Probability` pairs in component-id order. **Compilation flags:** `static` **Template:** `cluster_probabilities(Clusterer,Instance,Probabilities)` **Mode and number of proofs:** `cluster_probabilities(+compound,+list,-list(pair))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, kmeans_clusterer ### gaussian_process_regression") **object** #### `gaussian_process_regression` Gaussian process regression regressor supporting continuous and mixed-feature datasets using an exact mixed Gaussian process with posterior uncertainty estimates. Learns from a dataset object implementing the `regression_dataset_protocol` protocol and returns a regressor term that can be used for prediction, predictive-distribution queries, and export as predicate clauses. **Availability:** `logtalk_load(gaussian_process_regression(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-20 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** format linear_algebra list numberlist pairs population type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - `predict_distribution/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `predict_distribution/3` Predicts the posterior predictive Gaussian distribution for a new instance using the learned regressor. The returned term has the shape `gaussian(Mean,`` ``Variance)` where `Variance` includes the learned observation noise variance. **Compilation flags:** `static` **Template:** `predict_distribution(Regressor,Instance,Distribution)` **Mode and number of proofs:** `predict_distribution(+compound,+list,-compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, ridge_regression, lasso_regression, elastic_net_regression, regression_tree, random_forest_regression ### genint") **object** #### `genint` Global object for generating increasing non-negative integers for named counters. The predicates are declared as synchronized when the library is compiled using a backend supporting threads. **Availability:** `logtalk_load(genint(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2022-07-21 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` genint_core **Remarks:** (none) **Inherited public predicates:**  genint/2  reset_genint/0  reset_genint/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `genint_core` Predicates for generating increasing non-negative integers. The predicates are declared as synchronized when the library is compiled using a backend supporting threads. **Availability:** `logtalk_load(genint(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2022-07-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `reset_genint/0` - `reset_genint/1` - `genint/2` - Protected predicates - Private predicates - `counter_/2` - Operators ##### Public predicates ###### `reset_genint/0` Resets all counters. **Compilation flags:** `static,`` ``synchronized` **Mode and number of proofs:** `reset_genint` - `one` ------------------------------------------------------------------------ ###### `reset_genint/1` Resets the given counter. **Compilation flags:** `static,`` ``synchronized` **Template:** `reset_genint(Counter)` **Mode and number of proofs:** `reset_genint(+atom)` - `one` ------------------------------------------------------------------------ ###### `genint/2` Returns the next integer for a given counter. **Compilation flags:** `static,`` ``synchronized` **Template:** `genint(Counter,Integer)` **Mode and number of proofs:** `genint(+atom,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates ###### `counter_/2` Table of current state of counters. **Compilation flags:** `dynamic` **Template:** `counter_(Counter,Latest)` **Mode and number of proofs:** `counter_(?atom,?non_negative_integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### gensym") **object** #### `gensym` Global object for generating unique atoms. The predicates are declared as synchronized when the library is compiled using a backend supporting threads. **Availability:** `logtalk_load(gensym(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2022-07-21 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` gensym_core **Remarks:** (none) **Inherited public predicates:**  gensym/2  reset_gensym/0  reset_gensym/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `gensym_core` Predicates for generating unique atoms. Protocol based on the `gensym` module of SWI-Prolog. The predicates are declared as synchronized when the library is compiled using a backend supporting threads. **Availability:** `logtalk_load(gensym(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2022-07-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `reset_gensym/0` - `reset_gensym/1` - `gensym/2` - Protected predicates - Private predicates - `base_/2` - Operators ##### Public predicates ###### `reset_gensym/0` Resets the generator counter for all bases. **Compilation flags:** `static,`` ``synchronized` **Mode and number of proofs:** `reset_gensym` - `one` ------------------------------------------------------------------------ ###### `reset_gensym/1` Resets the generator counter for a given base. **Compilation flags:** `static,`` ``synchronized` **Template:** `reset_gensym(Base)` **Mode and number of proofs:** `reset_gensym(+atom)` - `one` ------------------------------------------------------------------------ ###### `gensym/2` Returns a new unique atom with a given base (prefix). **Compilation flags:** `static,`` ``synchronized` **Template:** `gensym(Base,Unique)` **Mode and number of proofs:** `gensym(+atom,-atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates ###### `base_/2` Table of generator bases and respective counters. **Compilation flags:** `dynamic` **Template:** `base_(Base,Counter)` **Mode and number of proofs:** `base_(?atom,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### geohash") **object** #### `geohash` Geohash encoder, decoder, adjacency, covering, hierarchy, integer conversion, bit-precision, and geometry covering predicates for `geographic(Latitude,Longitude)` coordinates. **Availability:** `logtalk_load(geohash(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` geohash_protocol **Imports:** `public` options **Uses:** geospatial list type **Remarks:** > - Alphabet: Uses the standard geohash base-32 alphabet `0123456789bcdefghjkmnpqrstuvwxyz`. > > - Encoding canonicalization: Encoding canonicalizes longitudes to the `[-180.0,180.0[` range, treating `180.0` as `-180.0` so equivalent dateline coordinates map to the same geohash. > > - Bounding boxes: Decoded cells are represented using `bbox(geographic(MinLatitude,MinLongitude),geographic(MaxLatitude,MaxLongitude))`. > > - Coverage: Bounding-box coverage accepts antimeridian-crossing boxes where the minimum longitude is greater than the maximum longitude. > > - Adaptive covering: Adaptive covers use `max_precision/1` together with `compact/1` and `min_precision/1` options. > > - Integer representation: Integer geohashes are 5-bit packed base-32 values with an explicit precision argument preserving leading zero groups. > > - Geometry covering: Polygon and polyline covering predicates rely on generic `geospatial` geometry predicates and do not support antimeridian-crossing input geometries. **Inherited public predicates:**  adjacent/3  adjacent_bits/4  adjacent_int/4  bounding_box/2  bounding_box_bits/3  bounding_box_int/3  cell_dimensions/3  check_option/1  check_options/1  children/2  common_prefix/3  compress/2  covering/3  covering/4  decode/2  decode_bits/3  decode_int/3  default_option/1  default_options/1  encode/3  encode_bits/3  encode_int/3  expand/2  expand_int/3  geohash_to_int/2  int_to_geohash/3  neighbors/2  neighbors_bits/3  neighbors_int/3  option/2  option/3  parent/2  polygon_covering/4  polyline_covering/4  precision/3  valid_geohash/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also geohash_protocol, geospatial **protocol** #### `geohash_protocol` Geohash predicates protocol. **Availability:** `logtalk_load(geohash(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-05-11 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid_geohash/1` - `encode/3` - `decode/2` - `bounding_box/2` - `precision/3` - `cell_dimensions/3` - `adjacent/3` - `neighbors/2` - `covering/3` - `covering/4` - `compress/2` - `parent/2` - `children/2` - `common_prefix/3` - `encode_int/3` - `decode_int/3` - `bounding_box_int/3` - `adjacent_int/4` - `neighbors_int/3` - `geohash_to_int/2` - `int_to_geohash/3` - `encode_bits/3` - `decode_bits/3` - `bounding_box_bits/3` - `adjacent_bits/4` - `neighbors_bits/3` - `expand/2` - `expand_int/3` - `polygon_covering/4` - `polyline_covering/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_geohash/1` True when the argument is a non-empty geohash atom using the standard geohash base-32 alphabet `0123456789bcdefghjkmnpqrstuvwxyz`. **Compilation flags:** `static` **Template:** `valid_geohash(Geohash)` **Mode and number of proofs:** `valid_geohash(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `encode/3` Encodes a geographic coordinate represented as `geographic(Latitude,Longitude)` into a geohash atom with the given precision in characters. Longitude is canonicalized to the `[-180.0,180.0[` range, so `180.0` is treated as `-180.0`. **Compilation flags:** `static` **Template:** `encode(Coordinate,Precision,Geohash)` **Mode and number of proofs:** `encode(+compound,+positive_integer,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `decode/2` Decodes a geohash atom into the center geographic coordinate of the represented cell. **Compilation flags:** `static` **Template:** `decode(Geohash,Coordinate)` **Mode and number of proofs:** `decode(+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bounding_box/2` Decodes a geohash atom into its geographic bounding box represented as `bbox(geographic(MinLatitude,MinLongitude),geographic(MaxLatitude,MaxLongitude))`. **Compilation flags:** `static` **Template:** `bounding_box(Geohash,BoundingBox)` **Mode and number of proofs:** `bounding_box(+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `precision/3` Returns the maximum latitude and longitude errors in degrees for geohashes of the given precision in characters. **Compilation flags:** `static` **Template:** `precision(Precision,LatitudeError,LongitudeError)` **Mode and number of proofs:** `precision(+positive_integer,-float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cell_dimensions/3` Returns the latitude and longitude spans in degrees of a geohash cell for the given precision in characters. **Compilation flags:** `static` **Template:** `cell_dimensions(Precision,LatitudeSpan,LongitudeSpan)` **Mode and number of proofs:** `cell_dimensions(+positive_integer,-float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `adjacent/3` Returns the adjacent geohash in the given direction. Supported directions are `north`, `south`, `east`, `west`, `north_east`, `north_west`, `south_east`, and `south_west`. Eastward and westward adjacency wraps across the antimeridian using the same longitude canonicalization as `encode/3`. Northward and southward adjacency fails when there is no neighboring cell beyond the poles. **Compilation flags:** `static` **Template:** `adjacent(Geohash,Direction,AdjacentGeohash)` **Mode and number of proofs:** `adjacent(+atom,+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `neighbors/2` Returns the available neighboring geohashes as `Direction-Geohash` pairs in clockwise order starting at north. **Compilation flags:** `static` **Template:** `neighbors(Geohash,Neighbors)` **Mode and number of proofs:** `neighbors(+atom,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `covering/3` Returns the list of geohashes at the given precision whose cells cover a geographic bounding box represented as `bbox(geographic(MinLatitude,MinLongitude),geographic(MaxLatitude,MaxLongitude))`. Degenerate point bounding boxes and exact cell-aligned boundaries are accepted. Antimeridian-crossing bounding boxes are accepted. **Compilation flags:** `static` **Template:** `covering(BoundingBox,Precision,Geohashes)` **Mode and number of proofs:** `covering(+compound,+positive_integer,-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `covering/4` Returns a geohash cover for a geographic bounding box. `CoverSpec` is either `precision(Precision)` for a fixed-depth cover or `max_precision(MaxPrecision)` for an adaptive mixed-depth cover. `Options` may include `compact(Boolean)` and `min_precision(PositiveInteger)`. **Compilation flags:** `static` **Template:** `covering(BoundingBox,CoverSpec,Geohashes,Options)` **Mode and number of proofs:** `covering(+compound,+compound,-list(atom),++list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `compress/2` Compresses a list of geohashes by replacing complete sibling sets with their parent prefix while preserving the covered area. **Compilation flags:** `static` **Template:** `compress(Geohashes,CompressedGeohashes)` **Mode and number of proofs:** `compress(+list(atom),-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `parent/2` Returns the immediate parent prefix of a geohash. Fails for precision-1 geohashes. **Compilation flags:** `static` **Template:** `parent(Geohash,Parent)` **Mode and number of proofs:** `parent(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `children/2` Returns the 32 child geohashes of a geohash in standard geohash base-32 order. **Compilation flags:** `static` **Template:** `children(Geohash,Children)` **Mode and number of proofs:** `children(+atom,-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `common_prefix/3` Returns the longest common geohash prefix shared by two geohashes. The prefix may be the empty atom when the geohashes share no leading characters. **Compilation flags:** `static` **Template:** `common_prefix(Geohash1,Geohash2,Prefix)` **Mode and number of proofs:** `common_prefix(+atom,+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `encode_int/3` Encodes a geographic coordinate into an integer geohash representation at the given precision in characters. **Compilation flags:** `static` **Template:** `encode_int(Coordinate,Precision,HashInteger)` **Mode and number of proofs:** `encode_int(+compound,+positive_integer,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `decode_int/3` Decodes an integer geohash representation at the given precision into the center geographic coordinate of the represented cell. **Compilation flags:** `static` **Template:** `decode_int(HashInteger,Precision,Coordinate)` **Mode and number of proofs:** `decode_int(+integer,+positive_integer,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bounding_box_int/3` Decodes an integer geohash representation at the given precision into its geographic bounding box. **Compilation flags:** `static` **Template:** `bounding_box_int(HashInteger,Precision,BoundingBox)` **Mode and number of proofs:** `bounding_box_int(+integer,+positive_integer,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `adjacent_int/4` Returns the adjacent integer geohash at the same precision in the given direction. **Compilation flags:** `static` **Template:** `adjacent_int(HashInteger,Precision,Direction,AdjacentHashInteger)` **Mode and number of proofs:** `adjacent_int(+integer,+positive_integer,+atom,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `neighbors_int/3` Returns the available neighboring integer geohashes as `Direction-HashInteger` pairs in clockwise order starting at north. **Compilation flags:** `static` **Template:** `neighbors_int(HashInteger,Precision,Neighbors)` **Mode and number of proofs:** `neighbors_int(+integer,+positive_integer,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `geohash_to_int/2` Converts a geohash atom to its packed integer representation using five bits per character. **Compilation flags:** `static` **Template:** `geohash_to_int(Geohash,HashInteger)` **Mode and number of proofs:** `geohash_to_int(+atom,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `int_to_geohash/3` Converts a packed integer geohash representation and an explicit precision in characters to a geohash atom. **Compilation flags:** `static` **Template:** `int_to_geohash(HashInteger,Precision,Geohash)` **Mode and number of proofs:** `int_to_geohash(+integer,+positive_integer,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `encode_bits/3` Encodes a geographic coordinate into an integer geohash representation using the given bit precision. **Compilation flags:** `static` **Template:** `encode_bits(Coordinate,Bits,HashInteger)` **Mode and number of proofs:** `encode_bits(+compound,+positive_integer,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `decode_bits/3` Decodes an integer geohash representation at the given bit precision into the center geographic coordinate of the represented cell. **Compilation flags:** `static` **Template:** `decode_bits(HashInteger,Bits,Coordinate)` **Mode and number of proofs:** `decode_bits(+integer,+positive_integer,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bounding_box_bits/3` Decodes an integer geohash representation at the given bit precision into its geographic bounding box. **Compilation flags:** `static` **Template:** `bounding_box_bits(HashInteger,Bits,BoundingBox)` **Mode and number of proofs:** `bounding_box_bits(+integer,+positive_integer,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `adjacent_bits/4` Returns the adjacent integer geohash at the same bit precision in the given direction. **Compilation flags:** `static` **Template:** `adjacent_bits(HashInteger,Bits,Direction,AdjacentHashInteger)` **Mode and number of proofs:** `adjacent_bits(+integer,+positive_integer,+atom,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `neighbors_bits/3` Returns the available neighboring integer geohashes as `Direction-HashInteger` pairs in clockwise order starting at north for the given bit precision. **Compilation flags:** `static` **Template:** `neighbors_bits(HashInteger,Bits,Neighbors)` **Mode and number of proofs:** `neighbors_bits(+integer,+positive_integer,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `expand/2` Returns the geohash followed by its available neighbors in clockwise order starting at north. **Compilation flags:** `static` **Template:** `expand(Geohash,ExpandedGeohashes)` **Mode and number of proofs:** `expand(+atom,-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `expand_int/3` Returns the integer geohash followed by its available neighboring integer geohashes in clockwise order starting at north. **Compilation flags:** `static` **Template:** `expand_int(HashInteger,Precision,ExpandedHashes)` **Mode and number of proofs:** `expand_int(+integer,+positive_integer,-list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ###### `polygon_covering/4` Returns a geohash cover for a polygon represented as a list of geographic coordinates. `CoverSpec` is either `precision(Precision)` for a fixed-depth cover or `max_precision(MaxPrecision)` for an adaptive mixed-depth cover. `Options` may include `compact(Boolean)` and `min_precision(PositiveInteger)`. Antimeridian-crossing polygons are not supported. **Compilation flags:** `static` **Template:** `polygon_covering(Polygon,CoverSpec,Geohashes,Options)` **Mode and number of proofs:** `polygon_covering(+list(compound),+compound,-list(atom),++list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `polyline_covering/4` Returns a geohash cover for a polyline represented as a list of two or more geographic coordinates. `CoverSpec` is either `precision(Precision)` for a fixed-depth cover or `max_precision(MaxPrecision)` for an adaptive mixed-depth cover. `Options` may include `compact(Boolean)`, `min_precision(PositiveInteger)`, and `buffer(Distance)` where the buffer distance is given in kilometers. Antimeridian-crossing polylines are not supported. **Compilation flags:** `static` **Template:** `polyline_covering(Polyline,CoverSpec,Geohashes,Options)` **Mode and number of proofs:** `polyline_covering(+list(compound),+compound,-list(atom),++list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also geohash, geospatial ### geojson") **object** #### `geojson` GeoJSON parser, generator, and validator using default JSON term representations. **Availability:** `logtalk_load(geojson(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-08 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` geojson(curly,dash,atom) **Remarks:** (none) **Inherited public predicates:**  generate/2  geojson_to_json/2  json_to_geojson/2  parse/2  validate/1  validate/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `geojson(ObjectRepresentation,PairRepresentation,StringRepresentation)` - `ObjectRepresentation` - Object representation to be used when decoding embedded JSON objects. Possible values are `curly` (default) and `list`. - `PairRepresentation` - Pair representation to be used when decoding embedded JSON objects. Possible values are `dash` (default), `equal`, and `colon`. - `StringRepresentation` - Text representation to be used when decoding JSON strings. Possible values are `atom` (default), `chars`, and `codes`. GeoJSON (RFC 7946) parser, generator, and validator built on top of the `json` library. **Availability:** `logtalk_load(geojson(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-07-07 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` geojson_protocol **Uses:** json(ObjectRepresentation,PairRepresentation,StringRepresentation) list **Remarks:** (none) **Inherited public predicates:**  generate/2  geojson_to_json/2  json_to_geojson/2  parse/2  validate/1  validate/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also json, geospatial **protocol** #### `geojson_protocol` GeoJSON (RFC 7946) parser, generator, and validator protocol. **Availability:** `logtalk_load(geojson(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-15 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `validate/1` - `validate/2` - `json_to_geojson/2` - `geojson_to_json/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a GeoJSON document from the given source (`file(Path)`, `stream(Stream)`, `codes(List)`, `chars(List)`, or `atom(Atom)`) into a native GeoJSON term. **Compilation flags:** `static` **Template:** `parse(Source,Term)` **Mode and number of proofs:** `parse(++compound,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(geojson_source,Source)` Parsed JSON does not represent a valid GeoJSON document: `domain_error(geojson,Document)` ------------------------------------------------------------------------ ###### `generate/2` Generates GeoJSON content using the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(List)`, `chars(List)`, or `atom(Atom)`) from a native GeoJSON term. **Compilation flags:** `static` **Template:** `generate(Sink,Term)` **Mode and number of proofs:** `generate(+compound,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid sink: `domain_error(geojson_sink,Sink)` `Term` is not a valid GeoJSON term: `domain_error(geojson,Term)` ------------------------------------------------------------------------ ###### `validate/1` True iff the argument is a valid native GeoJSON term according to RFC 7946. **Compilation flags:** `static` **Template:** `validate(Term)` **Mode and number of proofs:** `validate(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate/2` Validates a native GeoJSON term returning a list of reason terms whose final argument is the failing path. **Compilation flags:** `static` **Template:** `validate(Term,Errors)` **Mode and number of proofs:** `validate(@term,-list(compound))` - `one_or_error` **Exceptions:** `Term` is a variable: `instantiation_error` **Remarks:** > - invalid_geojson_term(Path): The term is not any supported GeoJSON geometry, feature, or feature collection representation. > > - invalid_geometry(Path): A geometry member is neither a valid geometry term nor `@null` where `@null` is allowed. > > - invalid_properties(Path): A feature properties member is neither `@null` nor a valid JSON object term in the selected representation. > > - invalid_options(Path): The options argument is not a list. > > - option_not_allowed(Name, Path): An option with the given name is not allowed for the enclosing GeoJSON term. > > - duplicate_option(Name, Path): The same option name occurs more than once in the options list. > > - unknown_option(Option, Path): An option term is not recognized as one of the supported options. > > - invalid_bbox(Path): A bounding box is not a list of four or six numbers. > > - bbox_longitude_out_of_range(Path): A bounding box longitude value lies outside the RFC 7946 range `[-180,180]`. > > - bbox_latitude_out_of_range(Path): A bounding box latitude value lies outside the RFC 7946 range `[-90,90]`. > > - bbox_latitude_order(Path): The south latitude value is greater than the north latitude value in a bounding box. > > - bbox_altitude_order(Path): The minimum altitude value is greater than the maximum altitude value in a three-dimensional bounding box. > > - bbox_dimension_mismatch(Actual, Expected, Path): A bounding box length does not match the dimensionality required by the represented geometry, feature, or collection. > > - invalid_id(Path): A feature identifier is neither a number nor a valid string term in the selected representation. > > - invalid_foreign_members(Path): Foreign members are not represented as a valid pair list or embedded JSON object term, or contain an invalid pair term. > > - prohibited_member(Key, Path): A prohibited foreign member name such as `crs` was used. > > - reserved_foreign_member(Key, Path): A reserved GeoJSON member name was used as a foreign member key. > > - invalid_position(Path): A position is not a list of at least two numeric coordinates. > > - position_longitude_out_of_range(Path): A position longitude value lies outside the RFC 7946 range `[-180,180]`. > > - position_latitude_out_of_range(Path): A position latitude value lies outside the RFC 7946 range `[-90,90]`. > > - invalid_json_object_pair(Path): A JSON object member is not represented using a supported key-value pair term. > > - invalid_json_key(Path): A JSON object key is not a valid string term in the selected representation. > > - duplicate_json_object_key(Key, Path): The same JSON object key occurs more than once in the same object. > > - invalid_json_value(Path): A JSON value is not a number, boolean, null, valid string term, array, or object term. > > - insufficient_positions(MinimumLength, Path): A coordinate array contains fewer positions than required for the enclosing geometry. > > - invalid_position_array(Path): A coordinate array expected to contain positions is not a list of valid positions. > > - inconsistent_position_dimension(Path): Positions in the same coordinate array do not all have the same dimensionality. > > - invalid_line_string_array(Path): A MultiLineString coordinate array is not a valid list of line string coordinate arrays. > > - invalid_polygon(Path): A polygon coordinate structure is invalid, for example because it is not a non-empty list of linear rings. > > - ring_not_closed(Path): A linear ring does not repeat its first position as its last position. > > - invalid_multi_polygon(Path): A MultiPolygon coordinate array is not a valid list of polygon coordinate arrays. > > - invalid_geometry_collection(Path): A GeometryCollection geometries member is not a list. > > - invalid_feature_collection(Path): A FeatureCollection features member is not a list. > > - invalid_feature(Path): A value inside a FeatureCollection is not a valid feature term. ------------------------------------------------------------------------ ###### `json_to_geojson/2` Converts a JSON term, as returned by the `json` library, into a native GeoJSON term. **Compilation flags:** `static` **Template:** `json_to_geojson(JSON,GeoJSON)` **Mode and number of proofs:** `json_to_geojson(+term,-term)` - `one_or_error` **Exceptions:** `JSON` is a variable: `instantiation_error` `JSON` is not a valid GeoJSON JSON term: `domain_error(geojson,JSON)` ------------------------------------------------------------------------ ###### `geojson_to_json/2` Converts a native GeoJSON term into a JSON term suitable for the `json` library. **Compilation flags:** `static` **Template:** `geojson_to_json(GeoJSON,JSON)` **Mode and number of proofs:** `geojson_to_json(+term,-term)` - `one_or_error` **Exceptions:** `GeoJSON` is a variable: `instantiation_error` `GeoJSON` is not a valid GeoJSON term: `domain_error(geojson,GeoJSON)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also geojson, json, geospatial ### geospatial") **object** #### `geospatial` Geospatial predicates over geographic coordinates represented as `geographic(Latitude,Longitude)`. **Availability:** `logtalk_load(geospatial(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` geospatial_protocol **Uses:** list **Remarks:** > - Distance unit: Kilometers. > > - Coordinate ranges: Latitude values must be in the `[-90.0,90.0]` range and longitude values in the `[-180.0,180.0]` range. **Inherited public predicates:**  along_track_distance/4  bbox_contains/2  bbox_contains_polygon/2  bbox_expand/3  bbox_from_coordinates/2  bbox_intersects/2  bbox_intersects_polygon/2  bbox_intersects_polyline/2  bbox_union/3  bounding_box/3  clockwise_polygon/2  close_polygon/2  coordinates_bounding_box/2  counterclockwise_polygon/2  cross_track_distance/4  destination_point/4  equirectangular_inverse/4  equirectangular_projection/4  final_bearing/3  haversine_distance/3  initial_bearing/3  interpolate_great_circle/4  interpolate_rhumb/4  is_clockwise_polygon/1  is_valid_polygon/1  mean_center/2  midpoint/3  minimum_enclosing_circle/3  nearest_coordinate/5  nearest_point_on_polyline/4  nearest_point_on_segment/4  normalize_coordinate/2  normalize_polygon_orientation/3  point_in_polygon/2  point_to_polyline_distance/3  polygon_area/2  polygon_bounding_box/2  polygon_centroid/2  polygon_orientation/2  polygon_perimeter/2  polygon_perimeter/3  polygons_intersect/2  polyline_length/2  polyline_length/3  polyline_resample/3  polyline_simplify/3  polyline_split_at_distance/4  rhumb_bearing/3  rhumb_destination_point/4  rhumb_distance/3  rhumb_midpoint/3  route_distance/2  route_distance/3  route_distance/4  valid_coordinate/1  vincenty_distance/3  within_distance/4 - Public predicates - `distance/4` - `distance/5` - `bbox_overlaps/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `distance/4` Computes the distance in kilometers between two coordinates using a selected metric. Supported metrics are `haversine`, `vincenty`, and `rhumb`. **Compilation flags:** `static` **Template:** `distance(Coordinate1,Coordinate2,Metric,Distance)` **Mode and number of proofs:** `distance(+compound,+compound,+atom,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distance/5` Computes the distance between two coordinates using a selected metric and output unit. Supported metrics are `haversine`, `vincenty`, and `rhumb`. Valid `Unit` argument values are `kilometers`, `meters`, `miles`, and `nautical_miles`. **Compilation flags:** `static` **Template:** `distance(Coordinate1,Coordinate2,Metric,Unit,Distance)` **Mode and number of proofs:** `distance(+compound,+compound,+atom,+atom,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_overlaps/2` True when two bounding boxes have a strict positive-area overlap. Touching only at an edge or corner fails. Antimeridian-crossing bounding boxes are supported. **Compilation flags:** `static` **Template:** `bbox_overlaps(BoundingBox1,BoundingBox2)` **Mode and number of proofs:** `bbox_overlaps(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also geospatial_protocol, numberlist **protocol** #### `geospatial_protocol` Geospatial predicates protocol. **Availability:** `logtalk_load(geospatial(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-11 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid_coordinate/1` - `normalize_coordinate/2` - `equirectangular_projection/4` - `equirectangular_inverse/4` - `haversine_distance/3` - `vincenty_distance/3` - `rhumb_distance/3` - `rhumb_bearing/3` - `rhumb_destination_point/4` - `interpolate_rhumb/4` - `rhumb_midpoint/3` - `distance/4` - `distance/5` - `initial_bearing/3` - `final_bearing/3` - `midpoint/3` - `destination_point/4` - `interpolate_great_circle/4` - `cross_track_distance/4` - `along_track_distance/4` - `within_distance/4` - `nearest_coordinate/5` - `mean_center/2` - `minimum_enclosing_circle/3` - `coordinates_bounding_box/2` - `point_in_polygon/2` - `polygon_area/2` - `polygon_centroid/2` - `polygon_bounding_box/2` - `close_polygon/2` - `polygon_orientation/2` - `is_clockwise_polygon/1` - `normalize_polygon_orientation/3` - `clockwise_polygon/2` - `counterclockwise_polygon/2` - `is_valid_polygon/1` - `bbox_contains/2` - `bbox_intersects/2` - `bbox_overlaps/2` - `bbox_union/3` - `bbox_expand/3` - `bbox_intersects_polygon/2` - `bbox_contains_polygon/2` - `bbox_from_coordinates/2` - `bbox_intersects_polyline/2` - `point_to_polyline_distance/3` - `nearest_point_on_segment/4` - `nearest_point_on_polyline/4` - `polyline_length/2` - `polyline_length/3` - `polyline_simplify/3` - `polyline_split_at_distance/4` - `polyline_resample/3` - `polygon_perimeter/2` - `polygon_perimeter/3` - `polygons_intersect/2` - `bounding_box/3` - `route_distance/2` - `route_distance/3` - `route_distance/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_coordinate/1` True if the argument is a valid geographic coordinate represented as `geographic(Latitude,Longitude)` with latitude in the `[-90.0,90.0]` range and longitude in the `[-180.0,180.0]` range. **Compilation flags:** `static` **Template:** `valid_coordinate(Coordinate)` **Mode and number of proofs:** `valid_coordinate(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `normalize_coordinate/2` Normalizes a coordinate by wrapping longitude to the `[-180.0,180.0]` range and reflecting latitude over the poles when necessary. **Compilation flags:** `static` **Template:** `normalize_coordinate(Coordinate,NormalizedCoordinate)` **Mode and number of proofs:** `normalize_coordinate(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `equirectangular_projection/4` Projects a coordinate to local equirectangular planar coordinates in kilometers using a reference latitude in degrees. **Compilation flags:** `static` **Template:** `equirectangular_projection(Coordinate,ReferenceLatitude,X,Y)` **Mode and number of proofs:** `equirectangular_projection(+compound,+float,-float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `equirectangular_inverse/4` Converts local equirectangular planar coordinates in kilometers to a geographic coordinate using a reference latitude in degrees. **Compilation flags:** `static` **Template:** `equirectangular_inverse(X,Y,ReferenceLatitude,Coordinate)` **Mode and number of proofs:** `equirectangular_inverse(+float,+float,+float,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `haversine_distance/3` Computes the great-circle distance in kilometers between two coordinates using the Haversine formula. **Compilation flags:** `static` **Template:** `haversine_distance(Coordinate1,Coordinate2,Distance)` **Mode and number of proofs:** `haversine_distance(+compound,+compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `vincenty_distance/3` Computes the geodesic distance in kilometers between two coordinates using the Vincenty inverse formula over the WGS84 ellipsoid. Fails if the iterative method does not converge. **Compilation flags:** `static` **Template:** `vincenty_distance(Coordinate1,Coordinate2,Distance)` **Mode and number of proofs:** `vincenty_distance(+compound,+compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rhumb_distance/3` Computes the rhumb-line (loxodrome) distance in kilometers between two coordinates on a spherical Earth model. **Compilation flags:** `static` **Template:** `rhumb_distance(Coordinate1,Coordinate2,Distance)` **Mode and number of proofs:** `rhumb_distance(+compound,+compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rhumb_bearing/3` Computes the rhumb-line initial bearing in degrees in the `[0.0,360.0[` range from the first coordinate to the second coordinate. **Compilation flags:** `static` **Template:** `rhumb_bearing(Coordinate1,Coordinate2,Bearing)` **Mode and number of proofs:** `rhumb_bearing(+compound,+compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rhumb_destination_point/4` Computes the destination coordinate from a start coordinate, a rhumb-line bearing in degrees, and a distance in kilometers on a spherical Earth model. **Compilation flags:** `static` **Template:** `rhumb_destination_point(Start,Bearing,Distance,Destination)` **Mode and number of proofs:** `rhumb_destination_point(+compound,+float,+float,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `interpolate_rhumb/4` Computes an intermediate coordinate along the rhumb-line path between two coordinates using a fraction in the `[0.0,1.0]` range. **Compilation flags:** `static` **Template:** `interpolate_rhumb(Coordinate1,Coordinate2,Fraction,Coordinate)` **Mode and number of proofs:** `interpolate_rhumb(+compound,+compound,+float,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rhumb_midpoint/3` Computes the midpoint along the rhumb-line path between two coordinates. **Compilation flags:** `static` **Template:** `rhumb_midpoint(Coordinate1,Coordinate2,Midpoint)` **Mode and number of proofs:** `rhumb_midpoint(+compound,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distance/4` Computes the distance in kilometers between two coordinates using a selected metric. Supported metrics are `haversine`, `vincenty`, and `rhumb`. **Compilation flags:** `static` **Template:** `distance(Coordinate1,Coordinate2,Metric,Distance)` **Mode and number of proofs:** `distance(+compound,+compound,+atom,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distance/5` Computes the distance between two coordinates using a selected metric and output unit. Supported metrics are `haversine`, `vincenty`, and `rhumb`. Valid `Unit` argument values are `kilometers`, `meters`, `miles`, and `nautical_miles`. **Compilation flags:** `static` **Template:** `distance(Coordinate1,Coordinate2,Metric,Unit,Distance)` **Mode and number of proofs:** `distance(+compound,+compound,+atom,+atom,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `initial_bearing/3` Computes the initial bearing in degrees in the `[0.0,360.0[` range from the first coordinate to the second coordinate. **Compilation flags:** `static` **Template:** `initial_bearing(Coordinate1,Coordinate2,Bearing)` **Mode and number of proofs:** `initial_bearing(+compound,+compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `final_bearing/3` Computes the final bearing in degrees in the `[0.0,360.0[` range when arriving at the second coordinate from the first coordinate. **Compilation flags:** `static` **Template:** `final_bearing(Coordinate1,Coordinate2,Bearing)` **Mode and number of proofs:** `final_bearing(+compound,+compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `midpoint/3` Computes the geographic midpoint between two coordinates using a spherical Earth model. **Compilation flags:** `static` **Template:** `midpoint(Coordinate1,Coordinate2,Midpoint)` **Mode and number of proofs:** `midpoint(+compound,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `destination_point/4` Computes the destination coordinate from a start coordinate, an initial bearing in degrees, and a distance in kilometers using a spherical Earth model. **Compilation flags:** `static` **Template:** `destination_point(Start,Bearing,Distance,Destination)` **Mode and number of proofs:** `destination_point(+compound,+float,+float,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `interpolate_great_circle/4` Computes an intermediate coordinate along the great-circle path between two coordinates using a fraction in the `[0.0,1.0]` range. **Compilation flags:** `static` **Template:** `interpolate_great_circle(Coordinate1,Coordinate2,Fraction,Coordinate)` **Mode and number of proofs:** `interpolate_great_circle(+compound,+compound,+float,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cross_track_distance/4` Computes the signed cross-track distance in kilometers from a coordinate to the great-circle path defined by a start and end coordinate. **Compilation flags:** `static` **Template:** `cross_track_distance(Coordinate,Start,End,Distance)` **Mode and number of proofs:** `cross_track_distance(+compound,+compound,+compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `along_track_distance/4` Computes the along-track distance in kilometers from the start coordinate to the closest point to a coordinate on the great-circle path defined by a start and end coordinate. **Compilation flags:** `static` **Template:** `along_track_distance(Coordinate,Start,End,Distance)` **Mode and number of proofs:** `along_track_distance(+compound,+compound,+compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `within_distance/4` True when the distance between two coordinates is less than or equal to the given radius in kilometers using the selected metric. **Compilation flags:** `static` **Template:** `within_distance(Coordinate1,Coordinate2,Radius,Metric)` **Mode and number of proofs:** `within_distance(+compound,+compound,+float,+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nearest_coordinate/5` Finds the nearest coordinate to the origin coordinate in a list using the selected metric, returning the nearest coordinate and distance in kilometers. **Compilation flags:** `static` **Template:** `nearest_coordinate(Origin,Coordinates,Metric,Nearest,Distance)` **Mode and number of proofs:** `nearest_coordinate(+compound,+list(compound),+atom,-compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `mean_center/2` Computes the arithmetic mean center of a list of one or more coordinates. **Compilation flags:** `static` **Template:** `mean_center(Coordinates,Center)` **Mode and number of proofs:** `mean_center(+list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `minimum_enclosing_circle/3` Computes an approximate minimum enclosing circle for a list of one or more coordinates, returning the circle center coordinate and radius in kilometers. **Compilation flags:** `static` **Template:** `minimum_enclosing_circle(Coordinates,Center,Radius)` **Mode and number of proofs:** `minimum_enclosing_circle(+list(compound),-compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `coordinates_bounding_box/2` Computes the axis-aligned latitude/longitude bounding box for a list of one or more coordinates. **Compilation flags:** `static` **Template:** `coordinates_bounding_box(Coordinates,BoundingBox)` **Mode and number of proofs:** `coordinates_bounding_box(+list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `point_in_polygon/2` True when a coordinate is inside (or on the boundary of) a polygon represented as a list of coordinates. Uses a planar ray-casting algorithm over latitude/longitude coordinates. **Compilation flags:** `static` **Template:** `point_in_polygon(Point,Polygon)` **Mode and number of proofs:** `point_in_polygon(+compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `polygon_area/2` Computes an approximate polygon area in square kilometers by projecting coordinates to a local equirectangular plane and applying the shoelace formula. **Compilation flags:** `static` **Template:** `polygon_area(Polygon,Area)` **Mode and number of proofs:** `polygon_area(+list(compound),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `polygon_centroid/2` Computes an approximate polygon centroid by using a local equirectangular projection and planar centroid formula. **Compilation flags:** `static` **Template:** `polygon_centroid(Polygon,Centroid)` **Mode and number of proofs:** `polygon_centroid(+list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `polygon_bounding_box/2` Computes the axis-aligned latitude/longitude bounding box for a polygon represented as a list of coordinates. **Compilation flags:** `static` **Template:** `polygon_bounding_box(Polygon,BoundingBox)` **Mode and number of proofs:** `polygon_bounding_box(+list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `close_polygon/2` Returns a closed polygon ring by ensuring the first coordinate is repeated at the end of the list. **Compilation flags:** `static` **Template:** `close_polygon(Polygon,ClosedPolygon)` **Mode and number of proofs:** `close_polygon(+list(compound),-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `polygon_orientation/2` Computes polygon ring orientation as `clockwise` or `counterclockwise` using a local projected signed area approximation. **Compilation flags:** `static` **Template:** `polygon_orientation(Polygon,Orientation)` **Mode and number of proofs:** `polygon_orientation(+list(compound),-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_clockwise_polygon/1` True when a polygon ring orientation is clockwise. **Compilation flags:** `static` **Template:** `is_clockwise_polygon(Polygon)` **Mode and number of proofs:** `is_clockwise_polygon(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `normalize_polygon_orientation/3` Normalizes a polygon ring orientation to `clockwise` or `counterclockwise`. **Compilation flags:** `static` **Template:** `normalize_polygon_orientation(Polygon,Orientation,OrientedPolygon)` **Mode and number of proofs:** `normalize_polygon_orientation(+list(compound),+atom,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `clockwise_polygon/2` Returns a polygon ring with clockwise orientation. **Compilation flags:** `static` **Template:** `clockwise_polygon(Polygon,ClockwisePolygon)` **Mode and number of proofs:** `clockwise_polygon(+list(compound),-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `counterclockwise_polygon/2` Returns a polygon ring with counterclockwise orientation. **Compilation flags:** `static` **Template:** `counterclockwise_polygon(Polygon,CounterclockwisePolygon)` **Mode and number of proofs:** `counterclockwise_polygon(+list(compound),-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_valid_polygon/1` True when a polygon has at least three valid coordinates after normalizing optional closure. **Compilation flags:** `static` **Template:** `is_valid_polygon(Polygon)` **Mode and number of proofs:** `is_valid_polygon(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_contains/2` True when a coordinate or bounding box is inside or on the boundary of a bounding box term `bbox(geographic(MinLatitude,MinLongitude),geographic(MaxLatitude,MaxLongitude))`. Antimeridian-crossing bounding boxes are supported. **Compilation flags:** `static` **Template:** `bbox_contains(BoundingBox,Contained)` **Mode and number of proofs:** `bbox_contains(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_intersects/2` True when two bounding boxes intersect or touch. Antimeridian-crossing bounding boxes are supported. **Compilation flags:** `static` **Template:** `bbox_intersects(BoundingBox1,BoundingBox2)` **Mode and number of proofs:** `bbox_intersects(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_overlaps/2` True when two bounding boxes have a strict positive-area overlap. Touching only at an edge or corner fails. Antimeridian-crossing bounding boxes are supported. **Compilation flags:** `static` **Template:** `bbox_overlaps(BoundingBox1,BoundingBox2)` **Mode and number of proofs:** `bbox_overlaps(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_union/3` Computes the minimal bounding box containing two bounding boxes. **Compilation flags:** `static` **Template:** `bbox_union(BoundingBox1,BoundingBox2,BoundingBox)` **Mode and number of proofs:** `bbox_union(+compound,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_expand/3` Expands a bounding box by a distance in kilometers on all sides using a local spherical approximation. **Compilation flags:** `static` **Template:** `bbox_expand(BoundingBox,Distance,ExpandedBoundingBox)` **Mode and number of proofs:** `bbox_expand(+compound,+number,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_intersects_polygon/2` True when a bounding box intersects a polygon or either contains the other. Antimeridian-crossing bounding boxes are supported. **Compilation flags:** `static` **Template:** `bbox_intersects_polygon(BoundingBox,Polygon)` **Mode and number of proofs:** `bbox_intersects_polygon(+compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_contains_polygon/2` True when a bounding box fully contains a polygon, including polygon vertices on the boundary. Antimeridian-crossing bounding boxes are supported. **Compilation flags:** `static` **Template:** `bbox_contains_polygon(BoundingBox,Polygon)` **Mode and number of proofs:** `bbox_contains_polygon(+compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_from_coordinates/2` Computes a bounding box from a list of one or more coordinates. **Compilation flags:** `static` **Template:** `bbox_from_coordinates(Coordinates,BoundingBox)` **Mode and number of proofs:** `bbox_from_coordinates(+list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bbox_intersects_polyline/2` True when a bounding box intersects or touches a polyline with two or more coordinates. Antimeridian-crossing bounding boxes are supported. **Compilation flags:** `static` **Template:** `bbox_intersects_polyline(BoundingBox,Polyline)` **Mode and number of proofs:** `bbox_intersects_polyline(+compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `point_to_polyline_distance/3` Computes the minimum distance in kilometers from a coordinate to a polyline with two or more coordinates. **Compilation flags:** `static` **Template:** `point_to_polyline_distance(Point,Polyline,Distance)` **Mode and number of proofs:** `point_to_polyline_distance(+compound,+list(compound),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nearest_point_on_segment/4` Computes the nearest coordinate on a segment to a coordinate using a local equirectangular approximation. **Compilation flags:** `static` **Template:** `nearest_point_on_segment(Point,SegmentStart,SegmentEnd,NearestPoint)` **Mode and number of proofs:** `nearest_point_on_segment(+compound,+compound,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nearest_point_on_polyline/4` Computes the nearest coordinate on a polyline to a coordinate and the corresponding distance in kilometers. **Compilation flags:** `static` **Template:** `nearest_point_on_polyline(Point,Polyline,NearestPoint,Distance)` **Mode and number of proofs:** `nearest_point_on_polyline(+compound,+list(compound),-compound,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `polyline_length/2` Computes the polyline length in kilometers for a list of two or more coordinates using the default `haversine` metric. **Compilation flags:** `static` **Template:** `polyline_length(Coordinates,Length)` **Mode and number of proofs:** `polyline_length(+list(compound),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `polyline_length/3` Computes the polyline length in kilometers for a list of two or more coordinates using the selected metric. **Compilation flags:** `static` **Template:** `polyline_length(Coordinates,Metric,Length)` **Mode and number of proofs:** `polyline_length(+list(compound),+atom,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `polyline_simplify/3` Simplifies a polyline using the Douglas-Peucker algorithm with a tolerance in kilometers. **Compilation flags:** `static` **Template:** `polyline_simplify(Coordinates,Tolerance,SimplifiedCoordinates)` **Mode and number of proofs:** `polyline_simplify(+list(compound),+number,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `polyline_split_at_distance/4` Splits a polyline at a distance in kilometers from its first coordinate, returning left and right polylines that share the split coordinate. **Compilation flags:** `static` **Template:** `polyline_split_at_distance(Coordinates,Distance,LeftCoordinates,RightCoordinates)` **Mode and number of proofs:** `polyline_split_at_distance(+list(compound),+number,-list(compound),-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `polyline_resample/3` Resamples a polyline using a fixed step in kilometers, preserving first and last coordinates. **Compilation flags:** `static` **Template:** `polyline_resample(Coordinates,Step,ResampledCoordinates)` **Mode and number of proofs:** `polyline_resample(+list(compound),+number,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `polygon_perimeter/2` Computes the polygon perimeter in kilometers using the default `haversine` metric. **Compilation flags:** `static` **Template:** `polygon_perimeter(Polygon,Perimeter)` **Mode and number of proofs:** `polygon_perimeter(+list(compound),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `polygon_perimeter/3` Computes the polygon perimeter in kilometers using the selected metric. **Compilation flags:** `static` **Template:** `polygon_perimeter(Polygon,Metric,Perimeter)` **Mode and number of proofs:** `polygon_perimeter(+list(compound),+atom,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `polygons_intersect/2` True when two polygons intersect or one polygon is contained in the other. **Compilation flags:** `static` **Template:** `polygons_intersect(Polygon1,Polygon2)` **Mode and number of proofs:** `polygons_intersect(+list(compound),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `bounding_box/3` Computes a spherical bounding box around a center coordinate for a given radius in kilometers. The returned bounding box term is `bbox(geographic(MinLatitude,MinLongitude),geographic(MaxLatitude,MaxLongitude))`. **Compilation flags:** `static` **Template:** `bounding_box(Center,Radius,BoundingBox)` **Mode and number of proofs:** `bounding_box(+compound,+positive_number,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_distance/2` Computes the route distance in kilometers for a list of two or more coordinates using the default `haversine` metric. **Compilation flags:** `static` **Template:** `route_distance(Coordinates,Distance)` **Mode and number of proofs:** `route_distance(+list(compound),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_distance/3` Computes the route distance in kilometers for a list of two or more coordinates using the selected metric. Supported metrics are `haversine`, `vincenty`, and `rhumb`. **Compilation flags:** `static` **Template:** `route_distance(Coordinates,Metric,Distance)` **Mode and number of proofs:** `route_distance(+list(compound),+atom,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_distance/4` Computes the route distance for a list of two or more coordinates using the selected metric and output unit. Supported metrics are `haversine`, `vincenty`, and `rhumb`. Valid `Unit` argument values are `kilometers`, `meters`, `miles`, and `nautical_miles`. **Compilation flags:** `static` **Template:** `route_distance(Coordinates,Metric,Unit,Distance)` **Mode and number of proofs:** `route_distance(+list(compound),+atom,+atom,-float)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also geospatial, numberlistp, listp ### git") **object** #### `git` Predicates for accessing a git project current branch and latest commit data. **Availability:** `logtalk_load(git(loader))` **Author:** Paulo Moura **Version:** 2:1:2 **Date:** 2024-03-11 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` git_protocol **Uses:** os user **Remarks:** (none) **Inherited public predicates:**  branch/2  commit_author/2  commit_date/2  commit_hash/2  commit_hash_abbreviated/2  commit_log/3  commit_message/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `git_protocol` Predicates for accessing a git project current branch and latest commit data. **Availability:** `logtalk_load(git(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2022-01-21 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `branch/2` - `commit_author/2` - `commit_date/2` - `commit_hash/2` - `commit_hash_abbreviated/2` - `commit_message/2` - `commit_log/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `branch/2` Returns the name of the current git branch. Fails if the directory is not a git repo or a sub-directory of a git repo directory. **Compilation flags:** `static` **Template:** `branch(Directory,Branch)` **Mode and number of proofs:** `branch(+atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `commit_author/2` Returns the latest commit author. Fails if the directory is not a git repo or a sub-directory of a git repo directory. **Compilation flags:** `static` **Template:** `commit_author(Directory,Author)` **Mode and number of proofs:** `commit_author(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `commit_date/2` Returns the latest commit date (strict ISO 8601 format). Fails if the directory is not a git repo or a sub-directory of a git repo directory. **Compilation flags:** `static` **Template:** `commit_date(Directory,Date)` **Mode and number of proofs:** `commit_date(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `commit_hash/2` Returns the latest commit hash. Fails if the directory is not a git repo or a sub-directory of a git repo directory. **Compilation flags:** `static` **Template:** `commit_hash(Directory,Hash)` **Mode and number of proofs:** `commit_hash(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `commit_hash_abbreviated/2` Returns the latest commit abbreviated hash. Fails if the directory is not a git repo or a sub-directory of a git repo directory. **Compilation flags:** `static` **Template:** `commit_hash_abbreviated(Directory,Hash)` **Mode and number of proofs:** `commit_hash_abbreviated(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `commit_message/2` Returns the latest commit message. Fails if the directory is not a git repo or a sub-directory of a git repo directory. **Compilation flags:** `static` **Template:** `commit_message(Directory,Message)` **Mode and number of proofs:** `commit_message(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `commit_log/3` Returns the git latest commit log output for the given format (see e.g. https://git-scm.com/docs/pretty-formats). Fails if the directory is not a git repo or a sub-directory of a git repo directory. **Compilation flags:** `static` **Template:** `commit_log(Directory,Format,Output)` **Mode and number of proofs:** `commit_log(+atom,+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### glicko2_periodic_ranker") **object** #### `glicko2_periodic_ranker` Multi-period Glicko-2 ranker over temporal pairwise game datasets with explicit rating periods and per-game results. **Availability:** `logtalk_load(glicko2_periodic_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common `public` glicko2_common **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also temporal_pairwise_ranking_dataset_protocol, ranker_protocol, glicko2_ranker ### glicko2_ranker") **object** #### `glicko2_ranker` Glicko-2 pairwise preference ranker. Learns one deterministic rating per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by applying one Glicko-2 rating-period update over the aggregated pairwise outcomes and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(glicko2_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, elo_ranker, rank_centrality ### gradient_boosting_classifier") **object** #### `gradient_boosting_classifier` Gradient boosting classifier using multinomial additive models fitted by regression trees to softmax residuals. **Availability:** `logtalk_load(gradient_boosting_classifier(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-06-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** format list numberlist regression_tree type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, regression_tree, gradient_boosting_regression, adaptive_boosting_classifier, random_forest_classifier ### gradient_boosting_regression") **object** #### `gradient_boosting_regression` Gradient boosting regression using regression trees as additive base learners fitted to successive residuals. **Availability:** `logtalk_load(gradient_boosting_regression(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** format list population regression_tree type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, knn_regression, regression_tree, random_forest_regression ### grammars") **object** #### `blank_grammars(Format)` Blank grammars. **Availability:** `logtalk_load(grammars(loader))` **Author:** Paulo Moura **Version:** 0:4:0 **Date:** 2025-10-06 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `white_space//0` - `white_spaces//0` - `space//0` - `spaces//0` - `tab//0` - `tabs//0` - `new_line//0` - `new_lines//0` - `blank//0` - `blanks//0` - `non_blank//1` - `non_blanks//1` - `control//0` - `controls//0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `white_space//0` Consumes a single space or tab. **Compilation flags:** `static` **Mode and number of proofs:** `white_space` - `zero_or_one` ------------------------------------------------------------------------ ###### `white_spaces//0` Consumes zero or more spaces and tabs. **Compilation flags:** `static` **Mode and number of proofs:** `white_spaces` - `one` ------------------------------------------------------------------------ ###### `space//0` Consumes a single space. **Compilation flags:** `static` **Mode and number of proofs:** `space` - `zero_or_one` ------------------------------------------------------------------------ ###### `spaces//0` Consumes zero or more spaces. **Compilation flags:** `static` **Mode and number of proofs:** `spaces` - `one` ------------------------------------------------------------------------ ###### `tab//0` Consumes a single tab. **Compilation flags:** `static` **Mode and number of proofs:** `tab` - `zero_or_one` ------------------------------------------------------------------------ ###### `tabs//0` Consumes zero or more tabs. **Compilation flags:** `static` **Mode and number of proofs:** `tabs` - `one` ------------------------------------------------------------------------ ###### `new_line//0` Consumes a single new line. **Compilation flags:** `static` **Mode and number of proofs:** `new_line` - `zero_or_one` ------------------------------------------------------------------------ ###### `new_lines//0` Consumes zero or more new lines. **Compilation flags:** `static` **Mode and number of proofs:** `new_lines` - `one` ------------------------------------------------------------------------ ###### `blank//0` Consumes a single space, tab, vertical tab, line feed, or new line. **Compilation flags:** `static` **Mode and number of proofs:** `blank` - `zero_or_one` ------------------------------------------------------------------------ ###### `blanks//0` Consumes zero or more spaces, tabs, vertical tabs, line feeds, or new lines. **Compilation flags:** `static` **Mode and number of proofs:** `blanks` - `one` ------------------------------------------------------------------------ ###### `non_blank//1` Returns a single non-blank character or character code. **Compilation flags:** `static` **Template:** `non_blank(NonBlank)` **Mode and number of proofs:** `non_blank(-atomic)` - `zero_or_one` ------------------------------------------------------------------------ ###### `non_blanks//1` Returns a (possibly empty) list of non-blank characters or character codes. **Compilation flags:** `static` **Template:** `non_blanks(NonBlanks)` **Mode and number of proofs:** `non_blanks(-list(atomic))` - `one` ------------------------------------------------------------------------ ###### `control//0` Consumes a single control character or character code. Support for the null control character depends on the Prolog backend. **Compilation flags:** `static` **Mode and number of proofs:** `control` - `zero_or_one` ------------------------------------------------------------------------ ###### `controls//0` Consumes zero or more control characters or character codes. Support for the null control character depends on the Prolog backend. **Compilation flags:** `static` **Mode and number of proofs:** `controls` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `ip_grammars(Format)` IP address grammars. **Availability:** `logtalk_load(grammars(loader))` **Author:** Paulo Moura **Version:** 0:2:0 **Date:** 2025-10-06 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** number_grammars(Format) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `ipv4//1` - `ipv6//1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `ipv4//1` Parses an IPv4 network address in the format XXX.XXX.XXX.XXX where each XXX is an octet (i.e., an integer between 0 and 255). **Compilation flags:** `static` **Template:** `ipv4(Octets)` **Mode and number of proofs:** `ipv4(?list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ###### `ipv6//1` Parses an IPv6 network address in the format XXXX.XXXX.XXXX.XXXX.XXXX.XXXX.XXXX.XXXX where each X is a hexadecimal digit. **Compilation flags:** `static` **Template:** `ipv6(HexDigits)` **Mode and number of proofs:** `ipv6(?list(integer))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `number_grammars(Format)` Number grammars. **Availability:** `logtalk_load(grammars(loader))` **Author:** Paulo Moura **Version:** 0:3:0 **Date:** 2025-10-06 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `bit//1` - `bits//1` - `digit//1` - `digits//1` - `hex_digit//1` - `hex_digits//1` - `natural//1` - `integer//1` - `float//1` - `number//1` - `sign//1` - `dot//1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `bit//1` Parses a single bit. **Compilation flags:** `static` **Template:** `bit(Bit)` **Mode and number of proofs:** `bit(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bits//1` Parses a sequence of one or more bits. **Compilation flags:** `static` **Template:** `bits(Bits)` **Mode and number of proofs:** `bits(?list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ###### `digit//1` Parses a single decimal digit. **Compilation flags:** `static` **Template:** `digit(Digit)` **Mode and number of proofs:** `digit(?atomic)` - `zero_or_one` ------------------------------------------------------------------------ ###### `digits//1` Parses a sequence of zero of more digits. **Compilation flags:** `static` **Template:** `digits(Digits)` **Mode and number of proofs:** `digits(?list(atomic))` - `one` ------------------------------------------------------------------------ ###### `hex_digit//1` Parses a single hexa-decimal digit. **Compilation flags:** `static` **Template:** `hex_digit(HexDigit)` **Mode and number of proofs:** `hex_digit(?atomic)` - `zero_or_one` ------------------------------------------------------------------------ ###### `hex_digits//1` Parses a sequence of zero or more hexa-decimal digits. **Compilation flags:** `static` **Template:** `hex_digits(HexDigits)` **Mode and number of proofs:** `hex_digits(?list(atomic))` - `one` ------------------------------------------------------------------------ ###### `natural//1` Parses a natural number (a non signed integer). **Compilation flags:** `static` **Template:** `natural(Natural)` **Mode and number of proofs:** `natural(?non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `integer//1` Parses an integer. **Compilation flags:** `static` **Template:** `integer(Integer)` **Mode and number of proofs:** `integer(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `float//1` Parses a float. **Compilation flags:** `static` **Template:** `float(Float)` **Mode and number of proofs:** `float(?float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `number//1` Parses a number (an integer or a float). **Compilation flags:** `static` **Template:** `number(Number)` **Mode and number of proofs:** `number(?number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sign//1` Parses a number sign (plus or minus). **Compilation flags:** `static` **Template:** `sign(Sign)` **Mode and number of proofs:** `sign(?atomic)` - `zero_or_one` ------------------------------------------------------------------------ ###### `dot//1` Parses a decimal dot. **Compilation flags:** `static` **Template:** `dot(Dot)` **Mode and number of proofs:** `dot(?atomic)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `sequence_grammars` Sequence grammars. **Availability:** `logtalk_load(grammars(loader))` **Author:** Paulo Moura **Version:** 0:4:0 **Date:** 2025-10-06 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `zero_or_more//2` - `one_or_more//2` - `zero_or_more//1` - `one_or_more//1` - `zero_or_more//0` - `one_or_more//0` - `without//2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `zero_or_more//2` Eagerly collect zero or more terminals that satisfy the given closure. **Compilation flags:** `static` **Template:** `zero_or_more(Closure,Terminals)` **Meta-predicate template:** `zero_or_more(1,*)` **Mode and number of proofs:** `zero_or_more(+callable,-list(atomic))` - `one` ------------------------------------------------------------------------ ###### `one_or_more//2` Eagerly collect one or more terminals that satisfy the given closure. **Compilation flags:** `static` **Template:** `one_or_more(Closure,Terminals)` **Meta-predicate template:** `one_or_more(1,*)` **Mode and number of proofs:** `one_or_more(+callable,-list(atomic))` - `zero_or_one` ------------------------------------------------------------------------ ###### `zero_or_more//1` Eagerly collect zero or more terminals. **Compilation flags:** `static` **Template:** `zero_or_more(Terminals)` **Mode and number of proofs:** `zero_or_more(-list(atomic))` - `one` ------------------------------------------------------------------------ ###### `one_or_more//1` Eagerly collect one or more terminals. **Compilation flags:** `static` **Template:** `one_or_more(Terminals)` **Mode and number of proofs:** `one_or_more(-list(atomic))` - `zero_or_one` ------------------------------------------------------------------------ ###### `zero_or_more//0` Eagerly parse zero or more terminals. **Compilation flags:** `static` **Mode and number of proofs:** `zero_or_more` - `one` ------------------------------------------------------------------------ ###### `one_or_more//0` Eagerly parse one or more terminals. **Compilation flags:** `static` **Mode and number of proofs:** `one_or_more` - `zero_or_one` ------------------------------------------------------------------------ ###### `without//2` Collects input terminals until one of the stop terminals is found. The stop terminals are excluded from the collected terminals. **Compilation flags:** `static` **Template:** `without(StopTerminals,Terminals)` **Mode and number of proofs:** `without(+list(atomic),-list(atomic))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### graphs") **category** #### `directed_graph_common` Common directed graph predicates shared by directed graph objects. Uses self-dispatch to call object-specific predicates and avltree for internal bookkeeping. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-25 **Compilation flags:** `static` **Implements:** `public` directed_graph_protocol **Extends:** `public` graph_common **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:**  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  cycle/2  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edges/2  empty/1  has_cycle/1  has_path/3  in_degree/3  is_acyclic/1  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  out_degree/3  path/3  reachable/3  strongly_connected_components/2  symmetric_closure/2  topological_sort/2  transitive_closure/2  transpose/2  vertices/2  weakly_connected_components/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `directed_graph_protocol` Protocol for directed graph predicates such as transpose, closures, topological sorting, degree queries, and strongly connected components. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-25 **Compilation flags:** `static` **Extends:** `public` graph_protocol **Remarks:** (none) **Inherited public predicates:**  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edges/2  empty/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2 - Public predicates - `transpose/2` - `transitive_closure/2` - `symmetric_closure/2` - `topological_sort/2` - `in_degree/3` - `out_degree/3` - `is_acyclic/1` - `has_cycle/1` - `cycle/2` - `strongly_connected_components/2` - `weakly_connected_components/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `transpose/2` Unifies `NewGraph` with a graph obtained by reversing all edges. **Compilation flags:** `static` **Template:** `transpose(Graph,NewGraph)` **Mode and number of proofs:** `transpose(+graph,-graph)` - `one` ------------------------------------------------------------------------ ###### `transitive_closure/2` Generates the transitive closure of the graph. **Compilation flags:** `static` **Template:** `transitive_closure(Graph,Closure)` **Mode and number of proofs:** `transitive_closure(+graph,-graph)` - `one` ------------------------------------------------------------------------ ###### `symmetric_closure/2` Generates the symmetric closure of the graph. **Compilation flags:** `static` **Template:** `symmetric_closure(Graph,Closure)` **Mode and number of proofs:** `symmetric_closure(+graph,-graph)` - `one` ------------------------------------------------------------------------ ###### `topological_sort/2` Unifies `Sorted` with a topological sort of the vertices in the graph. Assumes the graph is a DAG. **Compilation flags:** `static` **Template:** `topological_sort(Graph,Sorted)` **Mode and number of proofs:** `topological_sort(+graph,-list(vertex))` - `one` ------------------------------------------------------------------------ ###### `in_degree/3` Unifies `Degree` with the number of incoming edges to `Vertex`. Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `in_degree(Vertex,Graph,Degree)` **Mode and number of proofs:** `in_degree(+vertex,+graph,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `out_degree/3` Unifies `Degree` with the number of outgoing edges from `Vertex`. Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `out_degree(Vertex,Graph,Degree)` **Mode and number of proofs:** `out_degree(+vertex,+graph,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_acyclic/1` True iff the graph is a directed acyclic graph (DAG). **Compilation flags:** `static` **Template:** `is_acyclic(Graph)` **Mode and number of proofs:** `is_acyclic(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `has_cycle/1` True iff the graph contains at least one directed cycle. **Compilation flags:** `static` **Template:** `has_cycle(Graph)` **Mode and number of proofs:** `has_cycle(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cycle/2` Enumerates directed cycles as lists of vertices where the first and last vertices are the same. **Compilation flags:** `static` **Template:** `cycle(Graph,Cycle)` **Mode and number of proofs:** `cycle(+graph,-list(vertex))` - `zero_or_more` ------------------------------------------------------------------------ ###### `strongly_connected_components/2` Computes the strongly connected components of the graph using Tarjan’s algorithm. Each component is a sorted list of vertices. Components are returned in topological order. **Compilation flags:** `static` **Template:** `strongly_connected_components(Graph,SCCs)` **Mode and number of proofs:** `strongly_connected_components(+graph,-list(list(vertex)))` - `one` ------------------------------------------------------------------------ ###### `weakly_connected_components/2` Computes the weakly connected components of the graph by considering edge directions as undirected. Each component is returned as a sorted list of vertices. **Compilation flags:** `static` **Template:** `weakly_connected_components(Graph,Components)` **Mode and number of proofs:** `weakly_connected_components(+graph,-list(list(vertex)))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `graph_common` Common graph predicates shared by all graph objects. Uses self-dispatch to call object-specific predicates such as `neighbors/3`, `vertices/2`, and `edges/2`. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-17 **Compilation flags:** `static` **Implements:** `public` graph_protocol **Uses:** list set **Remarks:** (none) **Inherited public predicates:**  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edges/2  empty/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2 - Public predicates - Protected predicates - `pairs_to_edges/2` - `vertex_neighbors_to_edges/4` - `wpairs_to_edges/2` - `wvertex_neighbors_to_edges/4` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `pairs_to_edges/2` Converts a list of `Vertex-Neighbors` pairs from a dictionary into a flat list of `Vertex1-Vertex2` edges. **Compilation flags:** `static` **Template:** `pairs_to_edges(Pairs,Edges)` **Mode and number of proofs:** `pairs_to_edges(+list(pair),-list)` - `one` ------------------------------------------------------------------------ ###### `vertex_neighbors_to_edges/4` Converts a neighbor list for a vertex into edges using a difference list. **Compilation flags:** `static` **Template:** `vertex_neighbors_to_edges(Neighbors,Vertex,Edges,RestEdges)` **Mode and number of proofs:** `vertex_neighbors_to_edges(+list,+vertex,-list,-list)` - `one` ------------------------------------------------------------------------ ###### `wpairs_to_edges/2` Converts a list of `Vertex-WNeighbors` pairs from a dictionary into a flat list of `(Vertex1-Vertex2)-Weight` weighted edges. **Compilation flags:** `static` **Template:** `wpairs_to_edges(Pairs,Edges)` **Mode and number of proofs:** `wpairs_to_edges(+list(pair),-list)` - `one` ------------------------------------------------------------------------ ###### `wvertex_neighbors_to_edges/4` Converts a weighted neighbor list for a vertex into weighted edges using a difference list. **Compilation flags:** `static` **Template:** `wvertex_neighbors_to_edges(WNeighbors,Vertex,Edges,RestEdges)` **Mode and number of proofs:** `wvertex_neighbors_to_edges(+list,+vertex,-list,-list)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `graph_protocol` Common protocol for all types of graphs. Graphs are represented using a dictionary where keys are vertices and values are sorted lists of neighbors (implicitly defining edges). **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-25 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `new/1` - `new/2` - `new/3` - `empty/1` - `vertices/2` - `edges/2` - `add_vertex/3` - `add_vertices/3` - `delete_vertex/3` - `delete_vertices/3` - `add_edges/3` - `delete_edges/3` - `neighbors/3` - `reachable/3` - `breadth_first_order/3` - `depth_first_order/3` - `number_of_vertices/2` - `number_of_edges/2` - `path/3` - `has_path/3` - `min_path/5` - `max_path/5` - `min_distances/3` - `min_predecessors/3` - `all_pairs_min_paths/2` - `all_pairs_min_predecessors/2` - `is_complete/1` - `is_bipartite/1` - `is_sparse/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `new/1` Creates a new empty graph. **Compilation flags:** `static` **Template:** `new(Graph)` **Mode and number of proofs:** `new(-graph)` - `one` ------------------------------------------------------------------------ ###### `new/2` Creates a new graph from a list of edges. Vertices are defined implicitly by edges. **Compilation flags:** `static` **Template:** `new(Edges,Graph)` **Mode and number of proofs:** `new(+list(edge),-graph)` - `one` ------------------------------------------------------------------------ ###### `new/3` Creates a new graph from a list of vertices and a list of edges. Vertices may also be defined implicitly by edges. **Compilation flags:** `static` **Template:** `new(Vertices,Edges,Graph)` **Mode and number of proofs:** `new(+list(vertex),+list(edge),-graph)` - `one` ------------------------------------------------------------------------ ###### `empty/1` True iff the given graph is empty. **Compilation flags:** `static` **Template:** `empty(Graph)` **Mode and number of proofs:** `empty(@graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `vertices/2` Unifies `Vertices` with a sorted list of all vertices in the graph. **Compilation flags:** `static` **Template:** `vertices(Graph,Vertices)` **Mode and number of proofs:** `vertices(+graph,-list(vertex))` - `one` ------------------------------------------------------------------------ ###### `edges/2` Unifies `Edges` with a list of all edges in the graph. **Compilation flags:** `static` **Template:** `edges(Graph,Edges)` **Mode and number of proofs:** `edges(+graph,-list(edge))` - `one` ------------------------------------------------------------------------ ###### `add_vertex/3` Adds a vertex to the graph. If the vertex already exists, the graph is unchanged. **Compilation flags:** `static` **Template:** `add_vertex(Graph,Vertex,NewGraph)` **Mode and number of proofs:** `add_vertex(+graph,+vertex,-graph)` - `one` ------------------------------------------------------------------------ ###### `add_vertices/3` Adds a list of vertices to the graph. **Compilation flags:** `static` **Template:** `add_vertices(Graph,Vertices,NewGraph)` **Mode and number of proofs:** `add_vertices(+graph,+list(vertex),-graph)` - `one` ------------------------------------------------------------------------ ###### `delete_vertex/3` Deletes a vertex and all edges incident to it from the graph. If the vertex does not exist, the graph is unchanged. **Compilation flags:** `static` **Template:** `delete_vertex(Graph,Vertex,NewGraph)` **Mode and number of proofs:** `delete_vertex(+graph,+vertex,-graph)` - `one` ------------------------------------------------------------------------ ###### `delete_vertices/3` Deletes a list of vertices and all edges incident to them from the graph. **Compilation flags:** `static` **Template:** `delete_vertices(Graph,Vertices,NewGraph)` **Mode and number of proofs:** `delete_vertices(+graph,+list(vertex),-graph)` - `one` ------------------------------------------------------------------------ ###### `add_edges/3` Adds a list of edges to the graph. Vertices referenced by edges are added implicitly. **Compilation flags:** `static` **Template:** `add_edges(Graph,Edges,NewGraph)` **Mode and number of proofs:** `add_edges(+graph,+list(edge),-graph)` - `one` ------------------------------------------------------------------------ ###### `delete_edges/3` Deletes a list of edges from the graph. Vertices are not deleted. Non-existing edges are silently ignored. **Compilation flags:** `static` **Template:** `delete_edges(Graph,Edges,NewGraph)` **Mode and number of proofs:** `delete_edges(+graph,+list(edge),-graph)` - `one` ------------------------------------------------------------------------ ###### `neighbors/3` Unifies `Neighbors` with a sorted list of the neighbors of `Vertex` in the graph. Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `neighbors(Vertex,Graph,Neighbors)` **Mode and number of proofs:** `neighbors(+vertex,+graph,-list(vertex))` - `zero_or_one` ------------------------------------------------------------------------ ###### `reachable/3` Unifies `Vertices` with a sorted list of vertices reachable from `Vertex` (including `Vertex` itself). Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `reachable(Vertex,Graph,Vertices)` **Mode and number of proofs:** `reachable(+vertex,+graph,-list(vertex))` - `zero_or_one` ------------------------------------------------------------------------ ###### `breadth_first_order/3` Unifies `Vertices` with the breadth-first traversal order rooted at `Vertex`. Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `breadth_first_order(Vertex,Graph,Vertices)` **Mode and number of proofs:** `breadth_first_order(+vertex,+graph,-list(vertex))` - `zero_or_one` ------------------------------------------------------------------------ ###### `depth_first_order/3` Unifies `Vertices` with the depth-first traversal order rooted at `Vertex`. Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `depth_first_order(Vertex,Graph,Vertices)` **Mode and number of proofs:** `depth_first_order(+vertex,+graph,-list(vertex))` - `zero_or_one` ------------------------------------------------------------------------ ###### `number_of_vertices/2` Unifies `N` with the number of vertices in the graph. **Compilation flags:** `static` **Template:** `number_of_vertices(Graph,N)` **Mode and number of proofs:** `number_of_vertices(+graph,-integer)` - `one` ------------------------------------------------------------------------ ###### `number_of_edges/2` Unifies `N` with the number of edges in the graph. **Compilation flags:** `static` **Template:** `number_of_edges(Graph,N)` **Mode and number of proofs:** `number_of_edges(+graph,-integer)` - `one` ------------------------------------------------------------------------ ###### `path/3` Returns a maximal path (list of vertices) rooted at `Vertex`, enumerating different paths on backtracking. Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `path(Vertex,Graph,Path)` **Mode and number of proofs:** `path(+vertex,+graph,-list(vertex))` - `zero_or_more` ------------------------------------------------------------------------ ###### `has_path/3` True iff there is a path from `Vertex1` to `Vertex2` in the graph. **Compilation flags:** `static` **Template:** `has_path(Vertex1,Vertex2,Graph)` **Mode and number of proofs:** `has_path(+vertex,+vertex,+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `min_path/5` Finds the minimum cost path from `Vertex1` to `Vertex2`. For unweighted graphs, cost is the number of edges. Fails if no path exists. **Compilation flags:** `static` **Template:** `min_path(Vertex1,Vertex2,Graph,Path,Cost)` **Mode and number of proofs:** `min_path(+vertex,+vertex,+graph,-list(vertex),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `max_path/5` Finds the maximum cost acyclic path from `Vertex1` to `Vertex2`. For unweighted graphs, cost is the number of edges. Fails if no path exists. **Compilation flags:** `static` **Template:** `max_path(Vertex1,Vertex2,Graph,Path,Cost)` **Mode and number of proofs:** `max_path(+vertex,+vertex,+graph,-list(vertex),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `min_distances/3` Computes minimum path costs from `Vertex` to all reachable vertices. Returns a list of `Target-Cost` pairs including `Vertex-0`. **Compilation flags:** `static` **Template:** `min_distances(Vertex,Graph,Distances)` **Mode and number of proofs:** `min_distances(+vertex,+graph,-list(pair))` - `zero_or_one` ------------------------------------------------------------------------ ###### `min_predecessors/3` Computes predecessor links for minimum paths rooted at `Vertex`. Returns a list of `Target-Predecessor` pairs; the source predecessor is `none`. **Compilation flags:** `static` **Template:** `min_predecessors(Vertex,Graph,Predecessors)` **Mode and number of proofs:** `min_predecessors(+vertex,+graph,-list(pair))` - `zero_or_one` ------------------------------------------------------------------------ ###### `all_pairs_min_paths/2` Computes minimum path costs for all ordered pairs of vertices with a path between them. Returns a list of `(Vertex1-Vertex2)-Cost` terms. **Compilation flags:** `static` **Template:** `all_pairs_min_paths(Graph,Pairs)` **Mode and number of proofs:** `all_pairs_min_paths(+graph,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `all_pairs_min_predecessors/2` Computes predecessor links for minimum paths for all ordered source-target pairs with a path. Returns a list of `(Vertex1-Vertex2)-Predecessor` terms. **Compilation flags:** `static` **Template:** `all_pairs_min_predecessors(Graph,Pairs)` **Mode and number of proofs:** `all_pairs_min_predecessors(+graph,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `is_complete/1` True iff every pair of distinct vertices in the graph is connected by an edge. **Compilation flags:** `static` **Template:** `is_complete(Graph)` **Mode and number of proofs:** `is_complete(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_bipartite/1` True iff the graph is bipartite, i.e. its vertices can be partitioned into two sets such that every edge connects a vertex in one set to a vertex in the other. **Compilation flags:** `static` **Template:** `is_bipartite(Graph)` **Mode and number of proofs:** `is_bipartite(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_sparse/1` True iff the graph is sparse, i.e. the number of edges is at most `|V|`` ``*`` ``log2(|V|)`. The cutoff `|E|`` ``=`` ``|V|`` ``*`` ``log2(|V|)` separates sparse graphs (where adjacency lists are efficient) from dense graphs (where adjacency matrix representations may be preferable). **Compilation flags:** `static` **Template:** `is_sparse(Graph)` **Mode and number of proofs:** `is_sparse(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `graph_types` A set of graph related types and generators. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-02-19 **Compilation flags:** `static` **Provides:** type::type/1 type::check/2 arbitrary::arbitrary/1 arbitrary::arbitrary/2 **Uses:** integer type **Remarks:** > - Provided types: This category adds `vertex`, `edge`, and `weighted_edge` types for type-checking when using the `type` library object. > > - Type `vertex`: Any non-variable term. > > - Type `edge`: An unweighted edge represented as a `V1-V2` pair of vertices. > > - Type `weighted_edge`: A weighted edge represented as `(V1-V2)-Weight` where `V1` and `V2` are vertices and `Weight` is a number. > > - Generating edges: Use the `edges(N,V0,V)` generator for unweighted edges or `weighted_edges(N,V0,V,W)` for weighted edges. `N` is the upper limit to the number of edges. `V0` and `V` must be positive integers and will be used for the range of vertices. `W` is the upper limit for edge weights (positive integers). **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `undirected_graph_common` Common predicates shared by undirected graph objects. Uses self-dispatch to call object-specific predicates such as `is_connected/1`, `vertices/2`, `edges/2`, and `neighbors/3`. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-25 **Compilation flags:** `static` **Extends:** `public` graph_common **Uses:** avltree list set **Remarks:** (none) **Inherited public predicates:**  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edges/2  empty/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2 - Public predicates - `is_tree/1` - `has_cycle/1` - `cycle/2` - `graph_coloring/3` - `articulation_points/2` - `bridges/2` - `maximal_cliques/2` - `maximum_cliques/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `is_tree/1` True iff the graph is a tree, i.e. it is connected and has exactly `|V|`` ``-`` ``1` edges. **Compilation flags:** `static` **Template:** `is_tree(Graph)` **Mode and number of proofs:** `is_tree(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `has_cycle/1` True iff the graph contains at least one cycle. **Compilation flags:** `static` **Template:** `has_cycle(Graph)` **Mode and number of proofs:** `has_cycle(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cycle/2` Enumerates cycles as lists of vertices where the first and last vertices are the same. **Compilation flags:** `static` **Template:** `cycle(Graph,Cycle)` **Mode and number of proofs:** `cycle(+graph,-list(vertex))` - `zero_or_more` ------------------------------------------------------------------------ ###### `graph_coloring/3` Computes a greedy vertex coloring of the graph. `Coloring` is a list of `Vertex-Color` pairs where colors are integers starting from 1. `NumberOfColors` is the total number of colors used. **Compilation flags:** `static` **Template:** `graph_coloring(Graph,Coloring,NumberOfColors)` **Mode and number of proofs:** `graph_coloring(+graph,-list(pair),-integer)` - `one` ------------------------------------------------------------------------ ###### `articulation_points/2` Computes all articulation points (cut vertices) of the graph. The result is a sorted list of vertices. **Compilation flags:** `static` **Template:** `articulation_points(Graph,Points)` **Mode and number of proofs:** `articulation_points(+graph,-list(vertex))` - `one` ------------------------------------------------------------------------ ###### `bridges/2` Computes all bridges (cut edges) of the graph. Each bridge is returned once as `Vertex1-Vertex2` with `Vertex1`` ``@<`` ``Vertex2`. **Compilation flags:** `static` **Template:** `bridges(Graph,Bridges)` **Mode and number of proofs:** `bridges(+graph,-list(edge))` - `one` ------------------------------------------------------------------------ ###### `maximal_cliques/2` Computes all maximal cliques of the graph using the Bron-Kerbosch algorithm with pivoting. A maximal clique is a clique that cannot be extended by adding another adjacent vertex. Each clique is a sorted list of vertices. The list of cliques is sorted in standard order. **Compilation flags:** `static` **Template:** `maximal_cliques(Graph,Cliques)` **Mode and number of proofs:** `maximal_cliques(+graph,-list(list(vertex)))` - `one` ------------------------------------------------------------------------ ###### `maximum_cliques/2` Computes all maximum cliques of the graph, i.e. the largest maximal cliques. Each clique is a sorted list of vertices. The list of cliques is sorted in standard order. For an empty graph, returns an empty list. **Compilation flags:** `static` **Template:** `maximum_cliques(Graph,Cliques)` **Mode and number of proofs:** `maximum_cliques(+graph,-list(list(vertex)))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `unweighted_directed_graph` Unweighted directed graph predicates using the AVL tree dictionary representation. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-19 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` unweighted_directed_graph(avltree) **Remarks:** (none) **Inherited public predicates:**  add_edge/4  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  complement/2  compose/3  cycle/2  delete_edge/4  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/3  edges/2  empty/1  has_cycle/1  has_path/3  in_degree/3  is_acyclic/1  is_bipartite/1  is_complete/1  is_sparse/1  leaves/2  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  out_degree/3  path/3  reachable/3  strongly_connected_components/2  symmetric_closure/2  topological_sort/2  topological_sort/3  transitive_closure/2  transitive_reduction/2  transpose/2  union/3  vertices/2  weakly_connected_components/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `unweighted_directed_graph(Dictionary)` Unweighted directed graph predicates using a dictionary representation. The parametric object parameter is the dictionary to use for the graph representation. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-20 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` unweighted_graph_common(Dictionary) `public` directed_graph_common **Uses:** pairs set **Remarks:** (none) **Inherited public predicates:**  add_edge/4  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  complement/2  cycle/2  delete_edge/4  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/3  edges/2  empty/1  has_cycle/1  has_path/3  in_degree/3  is_acyclic/1  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  out_degree/3  path/3  reachable/3  strongly_connected_components/2  symmetric_closure/2  topological_sort/2  transitive_closure/2  transpose/2  vertices/2  weakly_connected_components/2 - Public predicates - `compose/3` - `union/3` - `topological_sort/3` - `leaves/2` - `transitive_reduction/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `compose/3` Composes `NewGraph` by connecting the drains of `LeftGraph` to the sources of `RightGraph`. **Compilation flags:** `static` **Template:** `compose(LeftGraph,RightGraph,NewGraph)` **Mode and number of proofs:** `compose(+graph,+graph,-graph)` - `one` ------------------------------------------------------------------------ ###### `union/3` Unifies `UnionGraph` with the union of `Graph1` and `Graph2`. **Compilation flags:** `static` **Template:** `union(Graph1,Graph2,UnionGraph)` **Mode and number of proofs:** `union(+graph,+graph,-graph)` - `one` ------------------------------------------------------------------------ ###### `topological_sort/3` Difference list version of `topological_sort/2` where `Sorted0` is the tail of `Sorted`. **Compilation flags:** `static` **Template:** `topological_sort(Graph,Sorted0,Sorted)` **Mode and number of proofs:** `topological_sort(+graph,+list(vertex),-list(vertex))` - `one` ------------------------------------------------------------------------ ###### `leaves/2` Unifies `Leaves` with a sorted list of vertices with no outgoing edges. **Compilation flags:** `static` **Template:** `leaves(Graph,Leaves)` **Mode and number of proofs:** `leaves(+graph,-list(vertex))` - `one` ------------------------------------------------------------------------ ###### `transitive_reduction/2` Computes the transitive reduction of the graph. An edge Vertex1-Vertex2 is in the reduction iff it is in the graph and there is no other path of length \>= 2 from Vertex1 to Vertex2. **Compilation flags:** `static` **Template:** `transitive_reduction(Graph,Reduction)` **Mode and number of proofs:** `transitive_reduction(+graph,-graph)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `unweighted_graph_common(Dictionary)` Common unweighted graph predicates shared by both unweighted directed and unweighted undirected graph objects. Uses self-dispatch to call object-specific predicates such as `add_edge/4`, `delete_edge/4`, and `neighbors/3`. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-20 **Compilation flags:** `static` **Implements:** `public` unweighted_graph_protocol **Extends:** `public` graph_common **Uses:** avltree list set **Remarks:** (none) **Inherited public predicates:**  add_edge/4  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  complement/2  delete_edge/4  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/3  edges/2  empty/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `unweighted_graph_protocol` Protocol for unweighted graph predicates, extending the common graph protocol with unweighted edge operations. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-19 **Compilation flags:** `static` **Extends:** `public` graph_protocol **Remarks:** (none) **Inherited public predicates:**  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edges/2  empty/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2 - Public predicates - `edge/3` - `add_edge/4` - `delete_edge/4` - `complement/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `edge/3` True iff there is an edge between `Vertex1` and `Vertex2` in `Graph`. **Compilation flags:** `static` **Template:** `edge(Vertex1,Vertex2,Graph)` **Mode and number of proofs:** `edge(+vertex,+vertex,+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `add_edge/4` Adds an edge between `Vertex1` and `Vertex2` to the graph. **Compilation flags:** `static` **Template:** `add_edge(Graph,Vertex1,Vertex2,NewGraph)` **Mode and number of proofs:** `add_edge(+graph,+vertex,+vertex,-graph)` - `one` ------------------------------------------------------------------------ ###### `delete_edge/4` Deletes the edge between `Vertex1` and `Vertex2` from the graph. The graph is unchanged if the edge does not exist. **Compilation flags:** `static` **Template:** `delete_edge(Graph,Vertex1,Vertex2,NewGraph)` **Mode and number of proofs:** `delete_edge(+graph,+vertex,+vertex,-graph)` - `one` ------------------------------------------------------------------------ ###### `complement/2` Unifies `NewGraph` with the complement graph where there is an edge between all pairs of vertices not connected in the original graph. **Compilation flags:** `static` **Template:** `complement(Graph,NewGraph)` **Mode and number of proofs:** `complement(+graph,-graph)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `unweighted_undirected_graph` Unweighted undirected graph predicates using the AVL tree dictionary representation. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-19 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` unweighted_undirected_graph(avltree) **Remarks:** (none) **Inherited public predicates:**  add_edge/4  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  articulation_points/2  breadth_first_order/3  bridges/2  complement/2  connected_components/2  cycle/2  degree/3  delete_edge/4  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/3  edges/2  empty/1  graph_coloring/3  has_cycle/1  has_path/3  is_bipartite/1  is_complete/1  is_connected/1  is_sparse/1  is_tree/1  max_path/5  maximal_cliques/2  maximum_cliques/2  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `unweighted_undirected_graph(Dictionary)` Unweighted undirected graph predicates using a dictionary representation. Undirected edges are stored as two directed edges. The parametric object parameter is the dictionary to use for the graph representation. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-20 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` unweighted_graph_common(Dictionary) `public` undirected_graph_common **Uses:** list set **Remarks:** (none) **Inherited public predicates:**  add_edge/4  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  articulation_points/2  breadth_first_order/3  bridges/2  complement/2  cycle/2  delete_edge/4  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/3  edges/2  empty/1  graph_coloring/3  has_cycle/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  is_tree/1  max_path/5  maximal_cliques/2  maximum_cliques/2  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2 - Public predicates - `degree/3` - `is_connected/1` - `connected_components/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `degree/3` Unifies `Degree` with the number of edges incident to `Vertex`. Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `degree(Vertex,Graph,Degree)` **Mode and number of proofs:** `degree(+vertex,+graph,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_connected/1` True iff the graph is connected (every vertex is reachable from every other vertex). **Compilation flags:** `static` **Template:** `is_connected(Graph)` **Mode and number of proofs:** `is_connected(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `connected_components/2` Unifies `Components` with a list of connected components. Each component is a sorted list of vertices. **Compilation flags:** `static` **Template:** `connected_components(Graph,Components)` **Mode and number of proofs:** `connected_components(+graph,-list(list(vertex)))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `weighted_directed_graph` Weighted directed graph predicates using the AVL tree dictionary representation. Edge weights use a pair representation (Vertex-Weight in neighbor lists, (Vertex1-Vertex2)-Weight for edge lists). **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-19 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` weighted_directed_graph(avltree) **Remarks:** (none) **Inherited public predicates:**  add_edge/5  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  cycle/2  delete_edge/5  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/4  edges/2  empty/1  has_cycle/1  has_negative_cycle/1  has_path/3  in_degree/3  is_acyclic/1  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_path_bellman_ford/5  min_paths/3  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  out_degree/3  path/3  reachable/3  strongly_connected_components/2  symmetric_closure/2  topological_sort/2  transitive_closure/2  transpose/2  vertices/2  weakly_connected_components/2  wneighbors/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `weighted_directed_graph(Dictionary)` Weighted directed graph predicates using a dictionary representation. Edge weights use a pair representation (Vertex-Weight in neighbor lists, (Vertex1-Vertex2)-Weight for edge lists). The parametric object parameter is the dictionary to use for the graph representation. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-20 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` weighted_graph_common(Dictionary) `public` directed_graph_common **Uses:** pairs **Remarks:** (none) **Inherited public predicates:**  add_edge/5  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  cycle/2  delete_edge/5  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/4  edges/2  empty/1  has_cycle/1  has_negative_cycle/1  has_path/3  in_degree/3  is_acyclic/1  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_path_bellman_ford/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  out_degree/3  path/3  reachable/3  strongly_connected_components/2  symmetric_closure/2  topological_sort/2  transitive_closure/2  transpose/2  vertices/2  weakly_connected_components/2  wneighbors/3 - Public predicates - `min_paths/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `min_paths/3` Computes shortest path tree from `Vertex1` to all reachable vertices. **Compilation flags:** `static` **Template:** `min_paths(Vertex1,Graph,PathTree)` **Mode and number of proofs:** `min_paths(+vertex,+graph,-graph)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `weighted_graph_common(Dictionary)` Common weighted graph predicates shared by both weighted directed and weighted undirected graph objects. Uses self-dispatch to call object-specific predicates such as `add_edge/5`, `delete_edge/5`, and `edges/2`. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-25 **Compilation flags:** `static` **Implements:** `public` weighted_graph_protocol **Extends:** `public` graph_common **Uses:** list pairs **Remarks:** (none) **Inherited public predicates:**  add_edge/5  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  delete_edge/5  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/4  edges/2  empty/1  has_negative_cycle/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_path_bellman_ford/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2  wneighbors/3 - Public predicates - Protected predicates - `winsert_neighbor/4` - `wremove_neighbor/4` - `wfind/3` - `wremove_vertex_from_all/3` - `relax_neighbors/7` - `pq_insert/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `winsert_neighbor/4` Inserts a weighted neighbor into a sorted weighted neighbor list, replacing any existing entry for the same vertex. **Compilation flags:** `static` **Template:** `winsert_neighbor(WNeighbors,Vertex,Weight,NewWNeighbors)` **Mode and number of proofs:** `winsert_neighbor(+list,+vertex,+number,-list)` - `one` ------------------------------------------------------------------------ ###### `wremove_neighbor/4` Removes a vertex from a sorted weighted neighbor list, unifying the weight. Fails if the vertex is not found. **Compilation flags:** `static` **Template:** `wremove_neighbor(WNeighbors,Vertex,Weight,NewWNeighbors)` **Mode and number of proofs:** `wremove_neighbor(+list,+vertex,-number,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `wfind/3` Finds the weight associated with a vertex in a weighted neighbor list. **Compilation flags:** `static` **Template:** `wfind(WNeighbors,Vertex,Weight)` **Mode and number of proofs:** `wfind(+list,+vertex,-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `wremove_vertex_from_all/3` Removes a vertex from all weighted neighbor lists in a list of vertex-neighbors pairs. **Compilation flags:** `static` **Template:** `wremove_vertex_from_all(Pairs,Vertex,NewPairs)` **Mode and number of proofs:** `wremove_vertex_from_all(+list(pair),+vertex,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `relax_neighbors/7` Relaxes neighbors during Dijkstra shortest path computation, updating distances and priority queue. **Compilation flags:** `static` **Template:** `relax_neighbors(WNeighbors,Vertex,Distance,Queue,Dist,NewQueue,NewDist)` **Mode and number of proofs:** `relax_neighbors(+list,+vertex,+number,+list,+dictionary,-list,-dictionary)` - `one` ------------------------------------------------------------------------ ###### `pq_insert/3` Inserts an element into a sorted priority queue (list of Distance-Vertex pairs). **Compilation flags:** `static` **Template:** `pq_insert(Queue,Item,NewQueue)` **Mode and number of proofs:** `pq_insert(+list,+pair,-list)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `weighted_graph_protocol` Protocol for weighted graph predicates, extending the common graph protocol with weighted edge operations. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-25 **Compilation flags:** `static` **Extends:** `public` graph_protocol **Remarks:** (none) **Inherited public predicates:**  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  breadth_first_order/3  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edges/2  empty/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  max_path/5  min_distances/3  min_path/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2 - Public predicates - `edge/4` - `add_edge/5` - `delete_edge/5` - `wneighbors/3` - `min_path_bellman_ford/5` - `has_negative_cycle/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `edge/4` True iff there is an edge between `Vertex1` and `Vertex2` with weight `Weight` in `Graph`. **Compilation flags:** `static` **Template:** `edge(Vertex1,Vertex2,Weight,Graph)` **Mode and number of proofs:** `edge(+vertex,+vertex,?number,+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `add_edge/5` Adds a weighted edge between `Vertex1` and `Vertex2` with weight `Weight`. **Compilation flags:** `static` **Template:** `add_edge(Graph,Vertex1,Vertex2,Weight,NewGraph)` **Mode and number of proofs:** `add_edge(+graph,+vertex,+vertex,+number,-graph)` - `one` ------------------------------------------------------------------------ ###### `delete_edge/5` Deletes the weighted edge between `Vertex1` and `Vertex2`. Unifies `Weight` with the weight of the deleted edge. The graph is unchanged if the edge does not exist. **Compilation flags:** `static` **Template:** `delete_edge(Graph,Vertex1,Vertex2,Weight,NewGraph)` **Mode and number of proofs:** `delete_edge(+graph,+vertex,+vertex,?number,-graph)` - `one` ------------------------------------------------------------------------ ###### `wneighbors/3` Unifies `WNeighbors` with a list of `NeighborVertex-Weight` pairs for the neighbors of `Vertex`. Fails if `Vertex` is not in the graph. **Compilation flags:** `static` **Template:** `wneighbors(Vertex,Graph,WNeighbors)` **Mode and number of proofs:** `wneighbors(+vertex,+graph,-list(pair))` - `zero_or_one` ------------------------------------------------------------------------ ###### `min_path_bellman_ford/5` Finds the minimum cost path from `Vertex1` to `Vertex2` using the Bellman-Ford algorithm. Supports negative edge weights and fails if no path exists or if a reachable negative cycle makes the optimum undefined. **Compilation flags:** `static` **Template:** `min_path_bellman_ford(Vertex1,Vertex2,Graph,Path,Cost)` **Mode and number of proofs:** `min_path_bellman_ford(+vertex,+vertex,+graph,-list(vertex),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `has_negative_cycle/1` True iff `Graph` contains a negative-weight cycle. **Compilation flags:** `static` **Template:** `has_negative_cycle(Graph)` **Mode and number of proofs:** `has_negative_cycle(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `weighted_undirected_graph` Weighted undirected graph predicates using the AVL tree dictionary representation. Each edge is stored in both directions. Edge weights use a pair representation (Vertex-Weight in neighbor lists, (V1-V2)-Weight for edge lists). **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-19 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` weighted_undirected_graph(avltree) **Remarks:** (none) **Inherited public predicates:**  add_edge/5  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  articulation_points/2  breadth_first_order/3  bridges/2  connected_components/2  cycle/2  degree/3  delete_edge/5  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/4  edges/2  empty/1  graph_coloring/3  has_cycle/1  has_negative_cycle/1  has_path/3  is_bipartite/1  is_complete/1  is_connected/1  is_sparse/1  is_tree/1  max_path/5  max_tree/3  maximal_cliques/2  maximum_cliques/2  min_distances/3  min_path/5  min_path_bellman_ford/5  min_predecessors/3  min_tree/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2  wneighbors/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `weighted_undirected_graph(Dictionary)` Weighted undirected graph predicates using a dictionary representation. Each edge is stored in both directions. Edge weights use a pair representation (`Vertex-Weight` in neighbor lists, `(Vertex1-Vertex2)-Weight` for edge lists). The parametric object parameter is the dictionary to use for the graph representation. **Availability:** `logtalk_load(graphs(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-20 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` weighted_graph_common(Dictionary) `public` undirected_graph_common **Uses:** list **Remarks:** (none) **Inherited public predicates:**  add_edge/5  add_edges/3  add_vertex/3  add_vertices/3  all_pairs_min_paths/2  all_pairs_min_predecessors/2  articulation_points/2  breadth_first_order/3  bridges/2  cycle/2  delete_edge/5  delete_edges/3  delete_vertex/3  delete_vertices/3  depth_first_order/3  edge/4  edges/2  empty/1  graph_coloring/3  has_cycle/1  has_negative_cycle/1  has_path/3  is_bipartite/1  is_complete/1  is_sparse/1  is_tree/1  max_path/5  maximal_cliques/2  maximum_cliques/2  min_distances/3  min_path/5  min_path_bellman_ford/5  min_predecessors/3  neighbors/3  new/1  new/2  new/3  number_of_edges/2  number_of_vertices/2  path/3  reachable/3  vertices/2  wneighbors/3 - Public predicates - `degree/3` - `is_connected/1` - `connected_components/2` - `min_tree/3` - `max_tree/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `degree/3` Returns the degree (number of edges incident to the vertex) of `Vertex` in `Graph`. **Compilation flags:** `static` **Template:** `degree(Vertex,Graph,Degree)` **Mode and number of proofs:** `degree(+vertex,+graph,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_connected/1` True if `Graph` is connected (all vertices are reachable from any vertex). **Compilation flags:** `static` **Template:** `is_connected(Graph)` **Mode and number of proofs:** `is_connected(+graph)` - `zero_or_one` ------------------------------------------------------------------------ ###### `connected_components/2` Returns the list of connected components (each a list of vertices). **Compilation flags:** `static` **Template:** `connected_components(Graph,Components)` **Mode and number of proofs:** `connected_components(+graph,-list(list))` - `one` ------------------------------------------------------------------------ ###### `min_tree/3` Constructs a minimum spanning tree and returns its total weight. **Compilation flags:** `static` **Template:** `min_tree(Graph,Tree,Cost)` **Mode and number of proofs:** `min_tree(+graph,-graph,-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `max_tree/3` Constructs a maximum spanning tree and returns its total weight. **Compilation flags:** `static` **Template:** `max_tree(Graph,Tree,Cost)` **Mode and number of proofs:** `max_tree(+graph,-graph,-number)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### gravatar") **object** #### `gravatar` Portable Gravatar profile client using the Gravatar REST API. **Availability:** `logtalk_load(gravatar(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** gravatar_api http_client http_core list os sha256 url(Representation) **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `profile/2` - `profile/3` - `profile_response/3` - `email_hash/2` - `field/3` - `hash/2` - `display_name/2` - `profile_url/2` - `avatar_url/2` - `avatar_alt_text/2` - `location/2` - `job_title/2` - `company/2` - `description/2` - `pronouns/2` - `verified_accounts/2` - `section_visibility/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `profile/2` Retrieves a Gravatar profile JSON object for an email address using default options. **Compilation flags:** `static` **Template:** `profile(Email,Profile)` **Mode and number of proofs:** `profile(+atom,-term)` - `one_or_error` **Exceptions:** `Email` is a variable: `instantiation_error` `Email` is neither a variable nor an atom: `type_error(atom,Email)` The Gravatar API returns a non-success response: `gravatar_api_error(Status,Body)` ------------------------------------------------------------------------ ###### `profile/3` Retrieves a Gravatar profile JSON object for an email address using the given options. **Compilation flags:** `static` **Template:** `profile(Email,Profile,Options)` **Mode and number of proofs:** `profile(+atom,-term,+list(compound))` - `one_or_error` **Exceptions:** `Email` is a variable: `instantiation_error` `Email` is neither a variable nor an atom: `type_error(atom,Email)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The Gravatar API returns a non-success response: `gravatar_api_error(Status,Body)` **Remarks:** > - Option `api_key(APIKey)`: Uses the given Gravatar API key as a Bearer token. When absent, the `LOGTALK_GRAVATAR_API_KEY` environment variable is used when defined. > > - Option `base_url(URL)`: Overrides the Gravatar API base URL. The default is `https://api.gravatar.com/v3`. > > - HTTP options: Options `headers/1`, `version/1`, `properties/1`, and `connection_options/1` are forwarded to the HTTP client. ------------------------------------------------------------------------ ###### `profile_response/3` Retrieves the raw normalized HTTP response for a Gravatar profile request. **Compilation flags:** `static` **Template:** `profile_response(Email,Response,Options)` **Mode and number of proofs:** `profile_response(+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Email` is a variable: `instantiation_error` `Email` is neither a variable nor an atom: `type_error(atom,Email)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` ------------------------------------------------------------------------ ###### `email_hash/2` Computes the Gravatar SHA-256 email hash after trimming leading and trailing whitespace and lowercasing ASCII letters. **Compilation flags:** `static` **Template:** `email_hash(Email,Hash)` **Mode and number of proofs:** `email_hash(+atom,-atom)` - `one_or_error` **Exceptions:** `Email` is a variable: `instantiation_error` `Email` is neither a variable nor an atom: `type_error(atom,Email)` ------------------------------------------------------------------------ ###### `field/3` Returns a top-level field from a decoded Gravatar profile JSON object. **Compilation flags:** `static` **Template:** `field(Profile,Field,Value)` **Mode and number of proofs:** `field(+term,+atom,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `hash/2` Returns the Gravatar profile hash field. **Compilation flags:** `static` **Template:** `hash(Profile,Value)` **Mode and number of proofs:** `hash(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `display_name/2` Returns the Gravatar profile display name field. **Compilation flags:** `static` **Template:** `display_name(Profile,Value)` **Mode and number of proofs:** `display_name(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `profile_url/2` Returns the Gravatar profile URL field. **Compilation flags:** `static` **Template:** `profile_url(Profile,Value)` **Mode and number of proofs:** `profile_url(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `avatar_url/2` Returns the Gravatar avatar URL field. **Compilation flags:** `static` **Template:** `avatar_url(Profile,Value)` **Mode and number of proofs:** `avatar_url(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `avatar_alt_text/2` Returns the Gravatar avatar alternative text field. **Compilation flags:** `static` **Template:** `avatar_alt_text(Profile,Value)` **Mode and number of proofs:** `avatar_alt_text(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `location/2` Returns the Gravatar profile location field. **Compilation flags:** `static` **Template:** `location(Profile,Value)` **Mode and number of proofs:** `location(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `job_title/2` Returns the Gravatar profile job title field. **Compilation flags:** `static` **Template:** `job_title(Profile,Value)` **Mode and number of proofs:** `job_title(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `company/2` Returns the Gravatar profile company field. **Compilation flags:** `static` **Template:** `company(Profile,Value)` **Mode and number of proofs:** `company(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `description/2` Returns the Gravatar profile description field. **Compilation flags:** `static` **Template:** `description(Profile,Value)` **Mode and number of proofs:** `description(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `pronouns/2` Returns the Gravatar profile pronouns field. **Compilation flags:** `static` **Template:** `pronouns(Profile,Value)` **Mode and number of proofs:** `pronouns(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `verified_accounts/2` Returns the Gravatar profile verified accounts field. **Compilation flags:** `static` **Template:** `verified_accounts(Profile,Value)` **Mode and number of proofs:** `verified_accounts(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `section_visibility/2` Returns the Gravatar profile section visibility field. **Compilation flags:** `static` **Template:** `section_visibility(Profile,Value)` **Mode and number of proofs:** `section_visibility(+term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `gravatar_api` REST metadata and path construction helpers for the Gravatar public API. **Availability:** `logtalk_load(gravatar(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` rest **Remarks:** (none) **Inherited public predicates:**  api_info/1  binary_body/2  created_response/4  form_body/2  handle/2  json_array_body/2  json_body/2  json_object_body/2  json_response/4  json_response/5  no_content_response/2  operations/1  path_parameter/3  problem_response/6  query_parameter/3  request_body/2  request_header/3  schema/2  security/1  security_scheme/2  servers/1  text_body/2 - Public predicates - `profile_path/2` - Protected predicates - `endpoint/5` - `profile/2` - Private predicates - Operators ##### Public predicates ###### `profile_path/2` Builds the profile endpoint path for a SHA-256 email hash or profile URL slug. **Compilation flags:** `static` **Template:** `profile_path(ProfileIdentifier,Path)` **Mode and number of proofs:** `profile_path(+atom,-atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates ###### `endpoint/5` REST endpoint descriptor for the Gravatar profile lookup operation. **Compilation flags:** `static` **Template:** `endpoint(Id,Method,Path,Action,Options)` **Mode and number of proofs:** `endpoint(?atom,?atom,?atom,?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `profile/2` Placeholder action for the remote Gravatar profile endpoint descriptor. **Compilation flags:** `static` **Template:** `profile(Request,Result)` **Mode and number of proofs:** `profile(+compound,--term)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### gsp_pattern_miner") **object** #### `gsp_pattern_miner` GSP sequential pattern miner for sequence datasets using level-wise candidate generation and pruning. **Availability:** `logtalk_load(gsp_pattern_miner(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` sequential_pattern_mining_common **Uses:** avltree format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pattern_miner_protocol, sequence_dataset_protocol, prefix_span_pattern_miner, spade_pattern_miner, clo_span_pattern_miner ### hashes") **object** #### `blake2b` BLAKE2b hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 hash_common_64 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also blake2s, sha512, sha512_256 **object** #### `blake2s` BLAKE2s hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also blake2b, md5, sha256 **object** #### `crc32_non_reflected(Polynomial,Initial,FinalXor,AppendLength)` - `Polynomial` - Canonical non-reflected CRC-32 polynomial. - `Initial` - Initial CRC accumulator value. - `FinalXor` - Final xor value. - `AppendLength` - Boolean flag controlling whether the message length is appended as little-endian bytes. Parametric non-reflected CRC-32 hash function using a canonical polynomial, configurable initial value and final xor value, and optional appended little-endian length bytes. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crc32_reflected(Polynomial), crc32b, crc32c, crc32posix, crc32mpeg2, crc32bzip2, crc32q, murmurhash3_x86_32, fnv1a_32 **object** #### `crc32_reflected(Polynomial)` - `Polynomial` - Reflected CRC-32 polynomial. Parametric reflected CRC-32 hash function using initial value 0xFFFFFFFF and final xor 0xFFFFFFFF. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_32 **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crc32_non_reflected(Polynomial,Initial,FinalXor,AppendLength), crc32b, crc32c, crc32posix, crc32mpeg2, crc32bzip2, crc32q, murmurhash3_x86_32, fnv1a_32 **object** #### `crc32b` CRC-32/ISO-HDLC hash function using the reflected polynomial 0xEDB88320, initial value 0xFFFFFFFF, and final xor 0xFFFFFFFF. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` crc32_reflected(3988292384) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crc32_reflected(Polynomial), crc32c, crc32posix, crc32mpeg2, crc32bzip2, crc32q, murmurhash3_x86_32, fnv1a_32 **object** #### `crc32bzip2` CRC-32/BZIP2 hash function using the canonical polynomial 0x04C11DB7, initial value 0xFFFFFFFF, and final xor 0xFFFFFFFF. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` crc32_non_reflected(79764919,4294967295,4294967295,false) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crc32_non_reflected(Polynomial,Initial,FinalXor,AppendLength), crc32mpeg2, crc32posix, crc32q, crc32_reflected(Polynomial), crc32b, crc32c, murmurhash3_x86_32, fnv1a_32 **object** #### `crc32c` CRC-32C/Castagnoli hash function using the reflected polynomial 0x82F63B78, initial value 0xFFFFFFFF, and final xor 0xFFFFFFFF. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` crc32_reflected(2197175160) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crc32_reflected(Polynomial), crc32b, crc32posix, crc32mpeg2, crc32bzip2, crc32q, murmurhash3_x86_32, fnv1a_32 **object** #### `crc32mpeg2` CRC-32/MPEG-2 hash function using the canonical polynomial 0x04C11DB7, initial value 0xFFFFFFFF, and final xor 0x00000000. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` crc32_non_reflected(79764919,4294967295,0,false) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crc32_non_reflected(Polynomial,Initial,FinalXor,AppendLength), crc32posix, crc32bzip2, crc32q, crc32_reflected(Polynomial), crc32b, crc32c, murmurhash3_x86_32, fnv1a_32 **object** #### `crc32posix` CRC-32/POSIX (cksum) hash function using the canonical polynomial 0x04C11DB7, initial value 0x00000000, appended little-endian length bytes, and final xor 0xFFFFFFFF. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` crc32_non_reflected(79764919,0,4294967295,true) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crc32_non_reflected(Polynomial,Initial,FinalXor,AppendLength), crc32_reflected(Polynomial), crc32b, crc32c, crc32mpeg2, crc32bzip2, crc32q, murmurhash3_x86_32, fnv1a_32 **object** #### `crc32q` CRC-32Q hash function, also used by AIXM-style formats, using the canonical polynomial 0x814141AB, initial value 0x00000000, and final xor 0x00000000. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` crc32_non_reflected(2168537515,0,0,false) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also crc32_non_reflected(Polynomial,Initial,FinalXor,AppendLength), crc32mpeg2, crc32bzip2, crc32posix, crc32_reflected(Polynomial), crc32b, crc32c, murmurhash3_x86_32, fnv1a_32 **object** #### `djb2_32` DJB2 32-bit hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_32 **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also djb2_64, sdbm_32, fnv1a_32 **object** #### `djb2_64` DJB2 64-bit hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_64 **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also djb2_32, sdbm_64, fnv1a_64 **object** #### `fips202_fixed_hash(RateBytes,Suffix,OutputBytes)` Common implementation of the fixed-size FIPS 202 SHA-3 variants suitable for use with HMAC. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-15 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol **Extends:** `public` fips202_hash(RateBytes,Suffix,OutputBytes) **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `fips202_hash(RateBytes,Suffix,OutputBytes)` Common implementation of the standardized FIPS 202 SHA-3 and SHAKE variants using the Keccak-f\[1600\] permutation. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_32 hash_common_64 list **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - `absorb/2` - `squeeze/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `absorb/2` Absorbs the input bytes into the Keccak state and returns the resulting state after the final padded block permutation. **Compilation flags:** `static` **Template:** `absorb(Bytes,State)` **Mode and number of proofs:** `absorb(+list(byte),--list(integer))` - `one` ------------------------------------------------------------------------ ###### `squeeze/3` Squeezes the requested number of output bytes from a Keccak state. **Compilation flags:** `static` **Template:** `squeeze(State,OutputBytes,DigestBytes)` **Mode and number of proofs:** `squeeze(+list(integer),+integer,--list(byte))` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `fnv1a_32` FNV-1a 32-bit hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_32 **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also fnv1a_64, djb2_32, sdbm_32 **object** #### `fnv1a_64` FNV-1a 64-bit hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_64 **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also fnv1a_32, djb2_64, sdbm_64 **object** #### `hash_common_32` Auxiliary predicates for the hashes library 32-bit algorithms. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2026-07-22 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `word32_hex/2` - `bytes_hex/2` - `mask32/1` - `add32/3` - `add32/4` - `add32/5` - `mul32/3` - `rol32/3` - `ror32/3` - `little_endian_word32/2` - `big_endian_word32/2` - `integer_to_little_endian_bytes32/3` - `integer_to_little_endian_bytes32/2` - `integer_to_big_endian_bytes32/3` - `integer_to_big_endian_bytes32/2` - `pad_md/4` - `pad_md_tail/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `word32_hex/2` Converts a 32-bit word into an 8-digit lowercase hexadecimal atom. **Compilation flags:** `static` **Template:** `word32_hex(Word,Hex)` **Mode and number of proofs:** `word32_hex(+integer,-atom)` - `one` ------------------------------------------------------------------------ ###### `bytes_hex/2` Converts a list of bytes into a lowercase hexadecimal atom. **Compilation flags:** `static` **Template:** `bytes_hex(Bytes,Hex)` **Mode and number of proofs:** `bytes_hex(+list(integer),-atom)` - `one` ------------------------------------------------------------------------ ###### `mask32/1` Returns the 32-bit mask value. **Compilation flags:** `static` **Template:** `mask32(Mask)` **Mode and number of proofs:** `mask32(-integer)` - `one` ------------------------------------------------------------------------ ###### `add32/3` Adds two integers modulo 2^32. **Compilation flags:** `static` **Template:** `add32(A,B,Sum)` **Mode and number of proofs:** `add32(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `add32/4` Adds three integers modulo 2^32. **Compilation flags:** `static` **Template:** `add32(A,B,C,Sum)` **Mode and number of proofs:** `add32(+integer,+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `add32/5` Adds four integers modulo 2^32. **Compilation flags:** `static` **Template:** `add32(A,B,C,D,Sum)` **Mode and number of proofs:** `add32(+integer,+integer,+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `mul32/3` Multiplies two integers modulo 2^32. Computed via 16-bit limb decomposition so that no intermediate result exceeds about 2\*\*49, avoiding integer overflow errors on backends with bounded integer arithmetic. **Compilation flags:** `static` **Template:** `mul32(A,B,Product)` **Mode and number of proofs:** `mul32(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `rol32/3` Rotates a 32-bit word left by the given number of bits. **Compilation flags:** `static` **Template:** `rol32(Value,Shift,Rotated)` **Mode and number of proofs:** `rol32(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `ror32/3` Rotates a 32-bit word right by the given number of bits. **Compilation flags:** `static` **Template:** `ror32(Value,Shift,Rotated)` **Mode and number of proofs:** `ror32(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `little_endian_word32/2` Decodes four bytes in little-endian order into a 32-bit word. **Compilation flags:** `static` **Template:** `little_endian_word32(Bytes,Word)` **Mode and number of proofs:** `little_endian_word32(+list(integer),-integer)` - `one` ------------------------------------------------------------------------ ###### `big_endian_word32/2` Decodes four bytes in big-endian order into a 32-bit word. **Compilation flags:** `static` **Template:** `big_endian_word32(Bytes,Word)` **Mode and number of proofs:** `big_endian_word32(+list(integer),-integer)` - `one` ------------------------------------------------------------------------ ###### `integer_to_little_endian_bytes32/3` Encodes a 32-bit word into four bytes in little-endian order. **Compilation flags:** `static` **Template:** `integer_to_little_endian_bytes32(Integer,Bytes,Tail)` **Mode and number of proofs:** `integer_to_little_endian_bytes32(+integer,-list(integer),-variable)` - `one` ------------------------------------------------------------------------ ###### `integer_to_little_endian_bytes32/2` Encodes a 32-bit word into four bytes in little-endian order. **Compilation flags:** `static` **Template:** `integer_to_little_endian_bytes32(Integer,Bytes)` **Mode and number of proofs:** `integer_to_little_endian_bytes32(+integer,-list(integer))` - `one` ------------------------------------------------------------------------ ###### `integer_to_big_endian_bytes32/3` Encodes a 32-bit word into four bytes in big-endian order. **Compilation flags:** `static` **Template:** `integer_to_big_endian_bytes32(Integer,Bytes,Tail)` **Mode and number of proofs:** `integer_to_big_endian_bytes32(+integer,-list(integer),-variable)` - `one` ------------------------------------------------------------------------ ###### `integer_to_big_endian_bytes32/2` Encodes a 32-bit word into four bytes in big-endian order. **Compilation flags:** `static` **Template:** `integer_to_big_endian_bytes32(Integer,Bytes)` **Mode and number of proofs:** `integer_to_big_endian_bytes32(+integer,-list(integer))` - `one` ------------------------------------------------------------------------ ###### `pad_md/4` Pads a message using MD-style padding with a little-endian or big-endian length field. **Compilation flags:** `static` **Template:** `pad_md(Endian,Bytes,LengthFieldBytes,PaddedBytes)` **Mode and number of proofs:** `pad_md(+little_big,+list(integer),+integer,-list(integer))` - `one` ------------------------------------------------------------------------ ###### `pad_md_tail/5` Pads the final, less-than-one-block tail of a message using MD-style padding given the total message length in bytes. For use when the message has already been consumed block by block during segmented/incremental hashing, so that only the unconsumed tail, and not the whole message, needs to be available. **Compilation flags:** `static` **Template:** `pad_md_tail(Endian,TailBytes,TotalLength,LengthFieldBytes,PaddedBytes)` **Mode and number of proofs:** `pad_md_tail(+little_big,+list(integer),+integer,+integer,-list(integer))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `hash_common_64` Auxiliary predicates for the hashes library 64-bit algorithms. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-06-01 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `word64_hex/2` - `mask64/1` - `add64/3` - `mul64/3` - `rol64/3` - `xor64/3` - `or64/3` - `and64/3` - `not64/2` - `shl64/3` - `shr64/3` - `integer_to_big_endian_bytes64/3` - `integer_to_big_endian_bytes64/2` - `pad_md_tail/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `word64_hex/2` Converts a 64-bit word into a 16-digit lowercase hexadecimal atom. **Compilation flags:** `static` **Template:** `word64_hex(Word,Hex)` **Mode and number of proofs:** `word64_hex(+integer,-atom)` - `one` ------------------------------------------------------------------------ ###### `mask64/1` Returns the 64-bit mask value. **Compilation flags:** `static` **Template:** `mask64(Mask)` **Mode and number of proofs:** `mask64(-integer)` - `one` ------------------------------------------------------------------------ ###### `add64/3` Adds two integers modulo 2^64. **Compilation flags:** `static` **Template:** `add64(A,B,Sum)` **Mode and number of proofs:** `add64(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `mul64/3` Multiplies two integers modulo 2^64. **Compilation flags:** `static` **Template:** `mul64(A,B,Product)` **Mode and number of proofs:** `mul64(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `rol64/3` Rotates a 64-bit word left by the given number of bits. **Compilation flags:** `static` **Template:** `rol64(Value,Shift,Rotated)` **Mode and number of proofs:** `rol64(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `xor64/3` Computes the bitwise exclusive-or of two integers modulo 2^64. **Compilation flags:** `static` **Template:** `xor64(A,B,Xor)` **Mode and number of proofs:** `xor64(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `or64/3` Computes the bitwise disjunction of two integers modulo 2^64. **Compilation flags:** `static` **Template:** `or64(A,B,Or)` **Mode and number of proofs:** `or64(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `and64/3` Computes the bitwise conjunction of two integers modulo 2^64. **Compilation flags:** `static` **Template:** `and64(A,B,And)` **Mode and number of proofs:** `and64(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `not64/2` Computes the bitwise complement of an integer modulo 2^64. **Compilation flags:** `static` **Template:** `not64(Value,Complement)` **Mode and number of proofs:** `not64(+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `shl64/3` Shifts a 64-bit word left by the given number of bits and masks the result. **Compilation flags:** `static` **Template:** `shl64(Value,Shift,Shifted)` **Mode and number of proofs:** `shl64(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `shr64/3` Shifts a 64-bit word right by the given number of bits after masking the input. **Compilation flags:** `static` **Template:** `shr64(Value,Shift,Shifted)` **Mode and number of proofs:** `shr64(+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `integer_to_big_endian_bytes64/3` Encodes a 64-bit word into eight bytes in big-endian order. **Compilation flags:** `static` **Template:** `integer_to_big_endian_bytes64(Integer,Bytes,Tail)` **Mode and number of proofs:** `integer_to_big_endian_bytes64(+integer,-list(integer),-variable)` - `one` ------------------------------------------------------------------------ ###### `integer_to_big_endian_bytes64/2` Encodes a 64-bit word into eight bytes in big-endian order. **Compilation flags:** `static` **Template:** `integer_to_big_endian_bytes64(Integer,Bytes)` **Mode and number of proofs:** `integer_to_big_endian_bytes64(+integer,-list(integer))` - `one` ------------------------------------------------------------------------ ###### `pad_md_tail/3` Pads the final, less-than-one-block tail of a message using SHA-512-style MD padding (128-byte blocks, a big-endian 128-bit length field) given the total message length in bytes. For use when the message has already been consumed block by block during segmented/incremental hashing, so that only the unconsumed tail, and not the whole message, needs to be available. **Compilation flags:** `static` **Template:** `pad_md_tail(TailBytes,TotalLength,PaddedBytes)` **Mode and number of proofs:** `pad_md_tail(+list(integer),+integer,-list(integer))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `hash_digest_protocol` Protocol for fixed-size cryptographic hash functions exposing raw digests and digest metadata. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-16 **Compilation flags:** `static` **Extends:** `public` hash_protocol **Remarks:** (none) **Inherited public predicates:**  hash/2 - Public predicates - `digest/2` - `digest_size/1` - `block_size/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `digest/2` Computes the digest for a list of bytes and returns it as a list of bytes. **Compilation flags:** `static` **Template:** `digest(Bytes,Digest)` **Mode and number of proofs:** `digest(+list(byte),--list(byte))` - `one` ------------------------------------------------------------------------ ###### `digest_size/1` Returns the digest size in bytes. **Compilation flags:** `static` **Template:** `digest_size(DigestSize)` **Mode and number of proofs:** `digest_size(--integer)` - `one` ------------------------------------------------------------------------ ###### `block_size/1` Returns the hash block size in bytes. **Compilation flags:** `static` **Template:** `block_size(BlockSize)` **Mode and number of proofs:** `block_size(--integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `hash_protocol` Hashing protocol. Hash values are returned as lowercase hexadecimal atoms using the output width of each algorithm or extensible-output function instance. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-04 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `hash/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `hash/2` Computes the hash for a list of bytes. **Compilation flags:** `static` **Template:** `hash(Bytes,Hash)` **Mode and number of proofs:** `hash(+list(byte),--atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `hash_state_protocol` Protocol for hash functions supporting genuine incremental hash computation via an explicit, caller-driven hashing state. Unlike computing a hash from a single, fully materialized message, this protocol lets the caller feed the message to the hash function one chunk at a time (e.g. as each chunk is read from a file or a network stream), discarding each chunk as soon as it has been folded into the state. Only the current chunk and a small, bounded amount of algorithm state (for block-padded and rate-limited algorithms, a leftover buffer smaller than one block or rate) are ever resident at once, regardless of the total message length. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-16 **Compilation flags:** `static` **Extends:** `public` hash_protocol **Remarks:** (none) **Inherited public predicates:**  hash/2 - Public predicates - `new_hash_state/1` - `update_hash_state/3` - `final_hash_state/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `new_hash_state/1` Creates a fresh hashing state, equivalent to having hashed the empty message so far. The state is an opaque, algorithm-specific term; callers should only pass it to update_hash_state/3 and final_hash_state/2, never inspect or construct it directly. **Compilation flags:** `static` **Template:** `new_hash_state(State)` **Mode and number of proofs:** `new_hash_state(--nonvar)` - `one` ------------------------------------------------------------------------ ###### `update_hash_state/3` Folds one chunk of bytes into a hashing state, returning the updated state. Can be called repeatedly, once per chunk, to fold in an arbitrarily long message without ever holding more than one chunk and the (bounded-size) state in memory at the same time. The chunks do not need to be the same length, and the empty chunk is allowed and is a no-op. **Compilation flags:** `static` **Template:** `update_hash_state(State,Bytes,NewState)` **Mode and number of proofs:** `update_hash_state(+nonvar,+list(byte),--nonvar)` - `one` ------------------------------------------------------------------------ ###### `final_hash_state/2` Finalizes a hashing state and returns the resulting hash, in the same representation as hash/2. The state must not be reused after finalization. **Compilation flags:** `static` **Template:** `final_hash_state(State,Hash)` **Mode and number of proofs:** `final_hash_state(+nonvar,--atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `md5` MD5 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha1, sha256 **object** #### `murmurhash3_x64_128` MurmurHash3 x64 128-bit hash function with seed 0. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_64 list **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also murmurhash3_x86_32, murmurhash3_x86_128 **object** #### `murmurhash3_x86_128` MurmurHash3 x86 128-bit hash function with seed 0. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also murmurhash3_x86_32, murmurhash3_x64_128 **object** #### `murmurhash3_x86_32` MurmurHash3 x86 32-bit hash function with seed 0. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-15 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also murmurhash3_x86_128, murmurhash3_x64_128 **object** #### `sdbm_32` sdbm 32-bit hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_32 **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sdbm_64, djb2_32, fnv1a_32 **object** #### `sdbm_64` sdbm 64-bit hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_64 **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sdbm_32, djb2_64, fnv1a_64 **object** #### `sha1` SHA-1 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also md5, sha256, sha224 **object** #### `sha224` SHA-224 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha256, sha1, sha384 **object** #### `sha256` SHA-256 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also md5, sha1, sha224 **object** #### `sha384` SHA-384 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 hash_common_64 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha512, sha512_256, sha256, sha224 **object** #### `sha3_224` FIPS 202 SHA3-224 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-15 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` fips202_fixed_hash(144,6,28) **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha3_256, sha3_384, sha3_512, shake128(OutputBytes), shake256(OutputBytes) **object** #### `sha3_256` FIPS 202 SHA3-256 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-15 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` fips202_fixed_hash(136,6,32) **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha3_224, sha3_384, sha3_512, sha256, shake128(OutputBytes), shake256(OutputBytes) **object** #### `sha3_384` FIPS 202 SHA3-384 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-15 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` fips202_fixed_hash(104,6,48) **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha3_224, sha3_256, sha3_512, shake128(OutputBytes), shake256(OutputBytes) **object** #### `sha3_512` FIPS 202 SHA3-512 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-15 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` fips202_fixed_hash(72,6,64) **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha3_224, sha3_256, sha3_384, shake128(OutputBytes), shake256(OutputBytes) **object** #### `sha512` SHA-512 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 hash_common_64 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha512_256, sha384, sha256, sha1 **object** #### `sha512_256` SHA-512/256 hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_digest_protocol `public` hash_state_protocol **Uses:** hash_common_32 hash_common_64 list **Remarks:** (none) **Inherited public predicates:**  block_size/1  digest/2  digest_size/1  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sha256, sha1, sha384 **object** #### `shake128(OutputBytes)` - `OutputBytes` - Number of output bytes to generate. FIPS 202 SHAKE128 extensible-output function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-04 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` fips202_hash(168,31,OutputBytes) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also shake256(OutputBytes), sha3_224, sha3_256, sha3_384, sha3_512 **object** #### `shake256(OutputBytes)` - `OutputBytes` - Number of output bytes to generate. FIPS 202 SHAKE256 extensible-output function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-04 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` fips202_hash(136,31,OutputBytes) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also shake128(OutputBytes), sha3_224, sha3_256, sha3_384, sha3_512 **object** #### `siphash_2_4` SipHash-2-4 hash function using the standard reference key 00 01 02 … 0f. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-04 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` [siphash_2_4(\[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15\])](index.html#siphash-2-4-1) **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also siphash_2_4(Key), fnv1a_64, crc32b, crc32c **object** #### `siphash_2_4(Key)` - `Key` - A list of 16 bytes. SipHash-2-4 keyed hash function. **Availability:** `logtalk_load(hashes(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hash_state_protocol **Uses:** hash_common_64 list **Remarks:** (none) **Inherited public predicates:**  final_hash_state/2  hash/2  new_hash_state/1  update_hash_state/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also siphash_2_4, fnv1a_64, crc32b, crc32c ### hdbscan_clusterer") **object** #### `hdbscan_clusterer` HDBSCAN clusterer for continuous datasets using a mutual-reachability hierarchy, condensed tree pruning, and stability-based cluster selection. **Availability:** `logtalk_load(hdbscan_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** format list numberlist pairs type union_find **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, dbscan_clusterer, optics_clusterer ### heaps") **object** #### `binary_heap(Order)` - `Order` - Either `<` for a min heap or `>` for a max heap. Heap implementation, parameterized by the order to be used to compare keys (`<` or `>`). **Availability:** `logtalk_load(heaps(loader))` **Author:** Richard O’Keefe; adapted to Logtalk by Paulo Moura and Victor Lagerkvist. **Version:** 1:2:0 **Date:** 2026-01-28 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` heap_protocol **Extends:** `public` compound **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also binary_heap_min, binary_heap_max **object** #### `binary_heap_max` Max-heap implementation. Uses standard order to compare keys. **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2010-02-19 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` binary_heap(\>) **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also binary_heap_min, binary_heap(Order) **object** #### `binary_heap_min` Min-heap implementation. Uses standard order to compare keys. **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2010-02-19 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` binary_heap(\<) **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also binary_heap_max, binary_heap(Order) **object** #### `heap(Order)` - `Order` - Either `<` for a min heap or `>` for a max heap. Heap implementation, parameterized by the order to be used to compare keys (`<` or `>`). Deprecated. Use the `binary_heap/1` object instead. **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-01-28 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` binary_heap(Order) **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also binary_heap(Order) **protocol** #### `heap_protocol` Heap protocol. Key-value pairs are represented as `Key-Value`. **Availability:** `logtalk_load(heaps(loader))` **Author:** Richard O’Keefe; adapted to Logtalk by Paulo Moura and Victor Lagerkvist. **Version:** 1:0:1 **Date:** 2010-11-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `insert/4` - `insert_all/3` - `delete/4` - `merge/3` - `empty/1` - `size/2` - `as_list/2` - `as_heap/2` - `top/3` - `top_next/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `insert/4` Inserts the new pair into a heap, returning the updated heap. **Compilation flags:** `static` **Template:** `insert(Key,Value,Heap,NewHeap)` **Mode and number of proofs:** `insert(+key,+value,+heap,-heap)` - `one` ------------------------------------------------------------------------ ###### `insert_all/3` Inserts a list of pairs into a heap, returning the updated heap. **Compilation flags:** `static` **Template:** `insert_all(List,Heap,NewHeap)` **Mode and number of proofs:** `insert_all(@list(pairs),+heap,-heap)` - `one` ------------------------------------------------------------------------ ###### `delete/4` Deletes and returns the top pair in a heap returning the updated heap. **Compilation flags:** `static` **Template:** `delete(Heap,TopKey,TopValue,NewHeap)` **Mode and number of proofs:** `delete(+heap,?key,?value,-heap)` - `zero_or_one` ------------------------------------------------------------------------ ###### `merge/3` Merges two heaps. **Compilation flags:** `static` **Template:** `merge(Heap1,Heap2,NewHeap)` **Mode and number of proofs:** `merge(+heap,+heap,-heap)` - `one` ------------------------------------------------------------------------ ###### `empty/1` True if the heap is empty. **Compilation flags:** `static` **Template:** `empty(Heap)` **Mode and number of proofs:** `empty(@heap)` - `zero_or_one` ------------------------------------------------------------------------ ###### `size/2` Returns the number of heap elements. **Compilation flags:** `static` **Template:** `size(Heap,Size)` **Mode and number of proofs:** `size(+heap,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `as_list/2` Returns the current set of pairs in the heap as a list, sorted into ascending order of the keys. **Compilation flags:** `static` **Template:** `as_list(Heap,List)` **Mode and number of proofs:** `as_list(+heap,-list)` - `one` ------------------------------------------------------------------------ ###### `as_heap/2` Constructs a heap from a list of pairs. **Compilation flags:** `static` **Template:** `as_heap(List,Heap)` **Mode and number of proofs:** `as_heap(+list,-heap)` - `one` ------------------------------------------------------------------------ ###### `top/3` Returns the top pair in the heap. Fails if the heap is empty. **Compilation flags:** `static` **Template:** `top(Heap,TopKey,TopValue)` **Mode and number of proofs:** `top(+heap,?key,?value)` - `zero_or_one` ------------------------------------------------------------------------ ###### `top_next/5` Returns the top pair and the next pair in the heap. Fails if the heap does not have at least two elements. **Compilation flags:** `static` **Template:** `top_next(Heap,TopKey,TopValue,NextKey,NextValue)` **Mode and number of proofs:** `top_next(+heap,?key,?value,?key,?value)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also heap(Order), pairing_heap(Order) **protocol** #### `heapp` Heap protocol. Deprecated. Use the `heap_protocol` protocol instead. **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-01-28 **Compilation flags:** `static` **Extends:** `public` heap_protocol **Remarks:** (none) **Inherited public predicates:**  as_heap/2  as_list/2  delete/4  empty/1  insert/4  insert_all/3  merge/3  size/2  top/3  top_next/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also heap_protocol **object** #### `maxheap` Max-heap implementation. Uses standard order to compare keys. Deprecated. Use the `binary_heap_max` object instead. **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2010-02-19 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` binary_heap(\>) **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also binary_heap_max **object** #### `minheap` Min-heap implementation. Uses standard order to compare keys. Deprecated. Use the `binary_heap_min` object instead. **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2010-02-19 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` binary_heap(\<) **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also binary_heap_min **object** #### `pairing_heap(Order)` - `Order` - Either `<` for a min heap or `>` for a max heap. Pairing heap implementation, parameterized by the order to be used to compare keys (`<` or `>`). **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` heap_protocol **Extends:** `public` compound **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairing_heap_min, pairing_heap_max **object** #### `pairing_heap_max` Max-pairing heap implementation. Uses standard order to compare keys. **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-01-28 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` pairing_heap(\>) **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairing_heap_min, pairing_heap(Order) **object** #### `pairing_heap_min` Min-pairing heap implementation. Uses standard order to compare keys. **Availability:** `logtalk_load(heaps(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-01-28 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` pairing_heap(\<) **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_heap/2  as_list/2  check/1  delete/4  depth/2  empty/1  ground/1  insert/4  insert_all/3  merge/3  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  size/2  subsumes/2  subterm/2  top/3  top_next/5  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairing_heap_max, pairing_heap(Order) ### help") **object** #### `help` Command-line help for Logtalk tools, libraries, entities, predicates, and non-terminals. **Availability:** `logtalk_load(help(loader))` **Author:** Paulo Moura **Version:** 0:43:0 **Date:** 2026-02-04 **Compilation flags:** `static,`` ``context_switching_calls,`` ``complements(allow)` **Implements:** `public` forwarding **Uses:** atom integer list os user **Remarks:** (none) **Inherited public predicates:**  forward/1 - Public predicates - `help/0` - `handbook/0` - `apis/0` - `apis/1` - `tools/0` - `tool/1` - `libraries/0` - `library/1` - `entity/1` - `(/)/2` - `(//)/2` - `man/1` - `completion/2` - `completions/2` - `built_in_directive/4` - `built_in_predicate/4` - `built_in_method/4` - `control_construct/4` - `built_in_non_terminal/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `help/0` Provides instructions on how to use the help tool. **Compilation flags:** `static` **Mode and number of proofs:** `help` - `one` ------------------------------------------------------------------------ ###### `handbook/0` Provides access to the Handbook. **Compilation flags:** `static` **Mode and number of proofs:** `handbook` - `one` ------------------------------------------------------------------------ ###### `apis/0` Provides access to the APIs documentation. **Compilation flags:** `static` **Mode and number of proofs:** `apis` - `one` ------------------------------------------------------------------------ ###### `apis/1` Provides help on the given predicate or non-terminal. **Compilation flags:** `static` **Template:** `apis(Indicator)` **Mode and number of proofs:** `apis(+predicate_indicator)` - `one` `apis(+non_terminal_indicator)` - `one` ------------------------------------------------------------------------ ###### `tools/0` Provides access to the developer tools documentation. **Compilation flags:** `static` **Mode and number of proofs:** `tools` - `one` ------------------------------------------------------------------------ ###### `tool/1` Provides help on the given developer tool. **Compilation flags:** `static` **Template:** `tool(Tool)` **Mode and number of proofs:** `tool(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `libraries/0` Provides access to the standard libraries documentation. **Compilation flags:** `static` **Mode and number of proofs:** `libraries` - `one` ------------------------------------------------------------------------ ###### `library/1` Provides help on the given standard library. **Compilation flags:** `static` **Template:** `library(Library)` **Mode and number of proofs:** `library(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity/1` Provides help on the given built-in, tool, and library entity (object, protocol, or category). **Compilation flags:** `static` **Template:** `entity(Entity)` **Mode and number of proofs:** `entity(+entity_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `(/)/2` Provides help on the `Name/Arity` built-in control construct, directive, predicate, or method. **Compilation flags:** `static` **Template:** `Name/Arity` **Mode and number of proofs:** `+atom/`` ``+integer` - `zero_or_one` ------------------------------------------------------------------------ ###### `(//)/2` Provides help on the `Name//Arity` built-in non-terminal. **Compilation flags:** `static` **Template:** `Name//Arity` **Mode and number of proofs:** `+atom//`` ``+integer` - `zero_or_one` ------------------------------------------------------------------------ ###### `man/1` Opens the man page of the given script. On POSIX systems, the page is open inline. On Windows system, the HTML version of the man page is open on the operating-system default browser. **Compilation flags:** `static` **Template:** `man(Page)` **Mode and number of proofs:** `man(+atom)` - `one` ------------------------------------------------------------------------ ###### `completion/2` Provides a completion pair, `Completion-Page`, for a given prefix. **Compilation flags:** `static` **Template:** `completion(Prefix,Completion)` **Mode and number of proofs:** `completion(+atom,-pair)` - `zero_or_more` ------------------------------------------------------------------------ ###### `completions/2` Provides a list of completions pairs, `Completion-Page`, for a given prefix. **Compilation flags:** `static` **Template:** `completions(Prefix,Completions)` **Mode and number of proofs:** `completions(+atom,-lists(pair))` - `zero_or_more` ------------------------------------------------------------------------ ###### `built_in_directive/4` Provides access to the HTML documenting files describing built-in directives. **Compilation flags:** `static` **Template:** `built_in_directive(Name,Arity,Directory,Basename)` **Mode and number of proofs:** `built_in_directive(?atom,?integer,-atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `built_in_predicate/4` Provides access to the HTML documenting files describing built-in predicates. **Compilation flags:** `static` **Template:** `built_in_predicate(Name,Arity,Directory,Basename)` **Mode and number of proofs:** `built_in_predicate(?atom,?integer,-atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `built_in_method/4` Provides access to the HTML documenting files describing built-in methods. **Compilation flags:** `static` **Template:** `built_in_method(Name,Arity,Directory,Basename)` **Mode and number of proofs:** `built_in_method(?atom,?integer,-atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `control_construct/4` Provides access to the HTML documenting files describing built-in control constructs. **Compilation flags:** `static` **Template:** `control_construct(Name,Arity,Directory,Basename)` **Mode and number of proofs:** `control_construct(?atom,?integer,-atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `built_in_non_terminal/4` Provides access to the HTML documenting files describing built-in DCG non-terminals. **Compilation flags:** `static` **Template:** `built_in_non_terminal(Name,Arity,Directory,Basename)` **Mode and number of proofs:** `built_in_non_terminal(?atom,?integer,-atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### hierarchical_clustering") **object** #### `hierarchical_clustering` Hierarchical clusterer for continuous datasets. Learns a full agglomerative_clusterer merge tree from a dataset object implementing the `clustering_dataset_protocol` protocol and then cuts the hierarchy to the requested number of clusters for prediction and export. **Availability:** `logtalk_load(hierarchical_clustering(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** avltree binary_heap_min format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - `cut/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `cut/3` Re-cuts a learned hierarchy to a new number of clusters without retraining. **Compilation flags:** `static` **Template:** `cut(Clusterer,K,RecutClusterer)` **Mode and number of proofs:** `cut(+compound,+integer,-compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, agglomerative_clusterer ### hierarchies") **category** #### `class_hierarchy` Class hierarchy predicates. **Availability:** `logtalk_load(hierarchies(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2006-02-20 **Compilation flags:** `static` **Implements:** `public` class_hierarchyp **Remarks:** (none) **Inherited public predicates:**  ancestor/1  ancestors/1  class/1  classes/1  descendant/1  descendant_class/1  descendant_classes/1  descendant_instance/1  descendant_instances/1  descendants/1  instance/1  instances/1  leaf/1  leaf_class/1  leaf_classes/1  leaf_instance/1  leaf_instances/1  leaves/1  subclass/1  subclasses/1  superclass/1  superclasses/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `class_hierarchyp` Class hierarchy protocol. **Availability:** `logtalk_load(hierarchies(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2000-07-24 **Compilation flags:** `static` **Extends:** `public` hierarchyp **Remarks:** (none) **Inherited public predicates:**  ancestor/1  ancestors/1  descendant/1  descendants/1  leaf/1  leaves/1 - Public predicates - `class/1` - `classes/1` - `instance/1` - `instances/1` - `subclass/1` - `subclasses/1` - `superclass/1` - `superclasses/1` - `leaf_instance/1` - `leaf_instances/1` - `leaf_class/1` - `leaf_classes/1` - `descendant_instance/1` - `descendant_instances/1` - `descendant_class/1` - `descendant_classes/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `class/1` Returns, by backtracking, all object classes. **Compilation flags:** `static` **Template:** `class(Class)` **Mode and number of proofs:** `class(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `classes/1` List of all object classes. **Compilation flags:** `static` **Template:** `classes(Classes)` **Mode and number of proofs:** `classes(-list)` - `one` ------------------------------------------------------------------------ ###### `instance/1` Returns, by backtracking, all class instances. **Compilation flags:** `static` **Template:** `instance(Instance)` **Mode and number of proofs:** `instance(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `instances/1` List of all class instances. **Compilation flags:** `static` **Template:** `instances(Instances)` **Mode and number of proofs:** `instances(-list)` - `one` ------------------------------------------------------------------------ ###### `subclass/1` Returns, by backtracking, all class subclasses. **Compilation flags:** `static` **Template:** `subclass(Subclass)` **Mode and number of proofs:** `subclass(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `subclasses/1` List of all class subclasses. **Compilation flags:** `static` **Template:** `subclasses(Subclasses)` **Mode and number of proofs:** `subclasses(-list)` - `one` ------------------------------------------------------------------------ ###### `superclass/1` Returns, by backtracking, all class superclasses. **Compilation flags:** `static` **Template:** `superclass(Superclass)` **Mode and number of proofs:** `superclass(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `superclasses/1` List of all class superclasses. **Compilation flags:** `static` **Template:** `superclasses(Superclasses)` **Mode and number of proofs:** `superclasses(-list)` - `one` ------------------------------------------------------------------------ ###### `leaf_instance/1` Returns, by backtracking, all class leaf instances. **Compilation flags:** `static` **Template:** `leaf_instance(Leaf)` **Mode and number of proofs:** `leaf_instance(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `leaf_instances/1` List of all class leaf instances. **Compilation flags:** `static` **Template:** `leaf_instances(Leaves)` **Mode and number of proofs:** `leaf_instances(-list)` - `one` ------------------------------------------------------------------------ ###### `leaf_class/1` Returns, by backtracking, all class leaf subclasses. **Compilation flags:** `static` **Template:** `leaf_class(Leaf)` **Mode and number of proofs:** `leaf_class(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `leaf_classes/1` List of all class leaf leaf subclasses. **Compilation flags:** `static` **Template:** `leaf_classes(Leaves)` **Mode and number of proofs:** `leaf_classes(-list)` - `one` ------------------------------------------------------------------------ ###### `descendant_instance/1` Returns, by backtracking, all class descendant instances. **Compilation flags:** `static` **Template:** `descendant_instance(Descendant)` **Mode and number of proofs:** `descendant_instance(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `descendant_instances/1` List of all class descendant instances. **Compilation flags:** `static` **Template:** `descendant_instances(Descendants)` **Mode and number of proofs:** `descendant_instances(-list)` - `one` ------------------------------------------------------------------------ ###### `descendant_class/1` Returns, by backtracking, all class descendant subclasses. **Compilation flags:** `static` **Template:** `descendant_class(Descendant)` **Mode and number of proofs:** `descendant_class(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `descendant_classes/1` List of all class descendant subclasses. **Compilation flags:** `static` **Template:** `descendant_classes(Descendants)` **Mode and number of proofs:** `descendant_classes(-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also class_hierarchy **protocol** #### `hierarchyp` Common hierarchy protocol for prototype and class hierarchies. **Availability:** `logtalk_load(hierarchies(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2000-07-24 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `ancestor/1` - `ancestors/1` - `leaf/1` - `leaves/1` - `descendant/1` - `descendants/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `ancestor/1` Returns, by backtracking, all object ancestors. **Compilation flags:** `static` **Template:** `ancestor(Ancestor)` **Mode and number of proofs:** `ancestor(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `ancestors/1` List of all object ancestors. **Compilation flags:** `static` **Template:** `ancestors(Ancestors)` **Mode and number of proofs:** `ancestors(-list)` - `one` ------------------------------------------------------------------------ ###### `leaf/1` Returns, by backtracking, all object leaves. **Compilation flags:** `static` **Template:** `leaf(Leaf)` **Mode and number of proofs:** `leaf(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `leaves/1` List of all object leaves. **Compilation flags:** `static` **Template:** `leaves(Leaves)` **Mode and number of proofs:** `leaves(-list)` - `one` ------------------------------------------------------------------------ ###### `descendant/1` Returns, by backtracking, all object descendants. **Compilation flags:** `static` **Template:** `descendant(Descendant)` **Mode and number of proofs:** `descendant(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `descendants/1` List of all object descendants. **Compilation flags:** `static` **Template:** `descendants(Descendants)` **Mode and number of proofs:** `descendants(-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `proto_hierarchy` Prototype hierarchy predicates. **Availability:** `logtalk_load(hierarchies(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2006-02-20 **Compilation flags:** `static` **Implements:** `public` proto_hierarchyp **Remarks:** (none) **Inherited public predicates:**  ancestor/1  ancestors/1  descendant/1  descendants/1  extension/1  extensions/1  leaf/1  leaves/1  parent/1  parents/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `proto_hierarchyp` Prototype hierarchy protocol. **Availability:** `logtalk_load(hierarchies(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2006-02-20 **Compilation flags:** `static` **Extends:** `public` hierarchyp **Remarks:** (none) **Inherited public predicates:**  ancestor/1  ancestors/1  descendant/1  descendants/1  leaf/1  leaves/1 - Public predicates - `parent/1` - `parents/1` - `extension/1` - `extensions/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parent/1` Returns, by backtracking, all object parents. **Compilation flags:** `static` **Template:** `parent(Parent)` **Mode and number of proofs:** `parent(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `parents/1` List of all object parents. **Compilation flags:** `static` **Template:** `parents(Parents)` **Mode and number of proofs:** `parents(-list)` - `one` ------------------------------------------------------------------------ ###### `extension/1` Returns, by backtracking, all object direct descendants. **Compilation flags:** `static` **Template:** `extension(Extension)` **Mode and number of proofs:** `extension(?object)` - `zero_or_more` ------------------------------------------------------------------------ ###### `extensions/1` List of all object direct descendants. **Compilation flags:** `static` **Template:** `extensions(Extensions)` **Mode and number of proofs:** `extensions(-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also proto_hierarchy ### hmac") **object** #### `hmac` HMAC (Keyed-Hash Message Authentication Code) implementation as specified in RFC 2104. **Availability:** `logtalk_load(hmac(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` hmac_protocol **Uses:** hash_common_32 list **Remarks:** (none) **Inherited public predicates:**  digest/4  digest/5  hex_digest/4  hex_digest/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also md5, sha1, sha224, sha256, sha384, sha512, sha512_256, sha3_224, sha3_256, sha3_384, sha3_512 **protocol** #### `hmac_protocol` Protocol for one-shot HMAC digest computation using hash objects implementing `hash_digest_protocol`. **Availability:** `logtalk_load(hmac(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-16 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `digest/4` - `hex_digest/4` - `digest/5` - `hex_digest/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `digest/4` Computes the full HMAC digest for a hash object, key bytes, and message bytes. **Compilation flags:** `static` **Template:** `digest(Hash,KeyBytes,MessageBytes,DigestBytes)` **Mode and number of proofs:** `digest(+object_identifier,+list(byte),+list(byte),--list(byte))` - `one` ------------------------------------------------------------------------ ###### `hex_digest/4` Computes the full HMAC digest for a hash object, key bytes, and message bytes, returning a lowercase hexadecimal atom. **Compilation flags:** `static` **Template:** `hex_digest(Hash,KeyBytes,MessageBytes,HexDigest)` **Mode and number of proofs:** `hex_digest(+object_identifier,+list(byte),+list(byte),--atom)` - `one` ------------------------------------------------------------------------ ###### `digest/5` Computes a truncated HMAC digest containing the requested number of leftmost bytes. **Compilation flags:** `static` **Template:** `digest(Hash,KeyBytes,MessageBytes,Length,DigestBytes)` **Mode and number of proofs:** `digest(+object_identifier,+list(byte),+list(byte),+integer,--list(byte))` - `one` ------------------------------------------------------------------------ ###### `hex_digest/5` Computes a truncated HMAC digest containing the requested number of leftmost bytes and returns it as a lowercase hexadecimal atom. **Compilation flags:** `static` **Template:** `hex_digest(Hash,KeyBytes,MessageBytes,Length,HexDigest)` **Mode and number of proofs:** `hex_digest(+object_identifier,+list(byte),+list(byte),+integer,--atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also hash_digest_protocol ### hodge_rank") **object** #### `hodge_rank` HodgeRank pairwise measurement ranker. Learns one deterministic zero-sum score per item from a dataset object implementing the `pairwise_measurement_dataset_protocol` protocol by solving the weighted graph-Laplacian least-squares system induced by signed edge measurements and returns a self-describing ranker term with diagnostics and residuals. **Availability:** `logtalk_load(hodge_rank(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common `public` pairwise_strength_ranker_common **Uses:** avltree list numberlist **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - `residuals/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `residuals/2` Returns the learned weighted edge residuals as `residual(Item1,Item2,Residual,Weight)` terms preserving measurement enumeration order. **Compilation flags:** `static` **Template:** `residuals(Ranker,Residuals)` **Mode and number of proofs:** `residuals(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_measurement_dataset_protocol, ranker_protocol, massey_ranker ### hook_flows") **object** #### `hook_pipeline(Pipeline)` - `Pipeline` - List of hook objects. Use a pipeline (represented using a list) of hook objects to expand terms and goals. The expansion results from a hook object are passed to the next hook object in the pipeline. **Availability:** `logtalk_load(hook_flows(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2024-09-27 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** > - Usage: Compile source files that should be expanded using the pipeline of hook objects using the compiler option `hook(hook_pipeline(Pipeline))`. **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also hook_set(Set) **object** #### `hook_set(Set)` - `Set` - Set (list) of hook objects. Use a set (represented using a list) of hook objects to expand terms and goals. The hook objects are tried in sequence until one of them succeeds in expanding the current term (goal) into a different term (goal). **Availability:** `logtalk_load(hook_flows(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2024-09-27 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** > - Usage: Compile source files that should be expanded using the set of hook objects using the compiler option `hook(hook_set(Set))`. **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also hook_pipeline(Pipeline) ### hook_objects") **object** #### `backend_adapter_hook` This hook object applies the expansion rules defined in the Prolog backend adapter file. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2020-02-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also default_workflow_hook, identity_hook, grammar_rules_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), print_goal_hook, suppress_goal_hook **object** #### `default_workflow_hook` Use this object as the default hook object to restore the default expansion pipeline semantics used by the compiler. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2020-03-24 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, identity_hook, grammar_rules_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), print_goal_hook, suppress_goal_hook **object** #### `grammar_rules_hook` This hook object expands grammar rules into clauses. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2020-02-14 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, identity_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), print_goal_hook, suppress_goal_hook **object** #### `identity_hook` Use this object as a file specific hook object to prevent any (other) user-defined expansion rules to be applied when compiling the file. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2020-02-15 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, grammar_rules_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), print_goal_hook, suppress_goal_hook **object** #### `object_wrapper_hook` Use this object to wrap the contents of a plain Prolog file in an object named after the file. The wrapper sets the `context_switching_calls` flag to `allow`, enabling calling of the wrapped predicates using the `< - Usage: Mark a goal to be printed by prefixing it with an operator. Printing uses a `comment` message. > > - To print goal before calling it: `-`` ``Goal`. > > - To print goal after calling it: `+`` ``Goal`. > > - To print goal before and after calling it: `*`` ``Goal`. > > - Operators: This hook object uses the standard `-` and `+` prefix operators and also defines a global `*` prefix operator with the same type and priority. **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, grammar_rules_hook, identity_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), suppress_goal_hook **object** #### `prolog_module_hook(Module)` This hook object applies the expansion rules defined in a Prolog module (e.g., `user`). **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2020-02-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, identity_hook, grammar_rules_hook, object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), print_goal_hook, suppress_goal_hook **object** #### `suppress_goal_hook` Use this object to easily suppress a goal in a clause body. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2020-05-04 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** > - Usage: Mark a goal to be suppressed by prefixing it with the `--` operator. > > - Operators: This hook object uses the `--` prefix operator declared by Logtalk for use in `mode/2` directives. **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, grammar_rules_hook, identity_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), print_goal_hook **object** #### `write_to_file_hook(File)` This hook object writes term-expansion results to a file in canonical format. The terms are terminated by a period and a new line. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2022-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` [write_to_file_hook(File,\[quoted(true),ignore_ops(true)\])](index.html#write-to-file-hook-2) **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, identity_hook, grammar_rules_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_file_hook(File,Options), write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), print_goal_hook, suppress_goal_hook **object** #### `write_to_file_hook(File,Options)` This hook object writes term-expansion results to a file using a list of `write_term/3` options. The terms are terminated by a period and a new line. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2022-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, identity_hook, grammar_rules_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_file_hook(File), write_to_stream_hook(Stream,Options), write_to_stream_hook(Stream), print_goal_hook, suppress_goal_hook **object** #### `write_to_stream_hook(Stream)` This hook object writes term-expansion results to a stream in canonical format. The terms are terminated by a period and a new line. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2020-02-16 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` [write_to_stream_hook(Stream,\[quoted(true),ignore_ops(true)\])](index.html#write-to-stream-hook-2) **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, identity_hook, grammar_rules_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream,Options), write_to_file_hook(File,Options), write_to_file_hook(File), print_goal_hook, suppress_goal_hook **object** #### `write_to_stream_hook(Stream,Options)` This hook object writes term-expansion results to a stream using a list of `write_term/3` options. The terms are terminated by a period and a new line. **Availability:** `logtalk_load(hook_objects(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2020-02-16 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also backend_adapter_hook, default_workflow_hook, identity_hook, grammar_rules_hook, prolog_module_hook(Module), object_wrapper_hook, write_to_stream_hook(Stream), write_to_file_hook(File,Options), write_to_file_hook(File), print_goal_hook, suppress_goal_hook ### html") **category** #### `html` HTML generation. **Availability:** `logtalk_load(html(loader))` **Author:** Paul Brown and Paulo Moura **Version:** 0:4:1 **Date:** 2021-06-16 **Compilation flags:** `static` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `generate/2` - `void_element/1` - `normal_element/2` - `aggregate_resources/2` - Protected predicates - Private predicates - `doctype/1` - Operators ##### Public predicates ###### `generate/2` Generates HTML content using the representation specified in the first argument (`stream(Stream)` or `file(Path)`) for the term in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Term)` **Mode and number of proofs:** `generate(+compound,++term)` - `one_or_error` **Exceptions:** `Sink` is not ground: `instantiation_error` `Term` is not ground: `instantiation_error` `Sink` is ground but not a valid sink term: `domain_error(html_sink,Sink)` ------------------------------------------------------------------------ ###### `void_element/1` Enumerates, by backtracking, all void elements. **Compilation flags:** `static` **Template:** `void_element(Element)` **Mode and number of proofs:** `void_element(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `normal_element/2` Enumerates, by backtracking, all normal elements. The value of the `Display` argument is either `inline` or `block`. **Compilation flags:** `static` **Template:** `normal_element(Element,Display)` **Mode and number of proofs:** `normal_element(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `aggregate_resources/2` Returns a dependency-aware, deduplicated list of resource declarations. **Compilation flags:** `static` **Template:** `aggregate_resources(Declarations,Resources)` **Mode and number of proofs:** `aggregate_resources(+list,-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `doctype/1` Doctype text. **Compilation flags:** `static` **Template:** `doctype(DocType)` **Mode and number of proofs:** `doctype(?atom)` - `one` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `html5` HTML content generation using the HTML 5 doctype. **Availability:** `logtalk_load(html(loader))` **Author:** Paul Brown and Paulo Moura **Version:** 1:0:0 **Date:** 2021-03-29 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` html **Remarks:** (none) **Inherited public predicates:**  aggregate_resources/2  generate/2  normal_element/2  void_element/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `xhtml11` XHTML content generation using the XHTML 1.1 doctype. **Availability:** `logtalk_load(html(loader))` **Author:** Paul Brown and Paulo Moura **Version:** 1:0:0 **Date:** 2021-03-29 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` html **Remarks:** (none) **Inherited public predicates:**  aggregate_resources/2  generate/2  normal_element/2  void_element/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_authenticate") **object** #### `http_authenticate` HTTP Basic authentication parsing, generation, challenge building, and request verification helpers. **Availability:** `logtalk_load(http_authenticate(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_text_helpers **Uses:** base64 http_core list type user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `challenge/2` - `authorization/2` - `parse_challenge/2` - `generate_challenge/2` - `parse_authorization/2` - `generate_authorization/2` - `protect_request/4` - `unauthorized_response/3` - `unauthorized_response/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `challenge/2` Returns the single parsed Basic `WWW-Authenticate` challenge from a normalized HTTP response when present. **Compilation flags:** `static` **Template:** `challenge(Response,Challenge)` **Mode and number of proofs:** `challenge(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `authorization/2` Returns the single parsed Basic `Authorization` header from a normalized HTTP request when present. **Compilation flags:** `static` **Template:** `authorization(Request,Authorization)` **Mode and number of proofs:** `authorization(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse_challenge/2` Parses one Basic challenge header field value into a normalized `basic_challenge/1` term. **Compilation flags:** `static` **Template:** `parse_challenge(Text,Challenge)` **Mode and number of proofs:** `parse_challenge(++text,-compound)` - `one_or_error` **Exceptions:** `Text` is not a valid Basic challenge header value: `domain_error(http_authenticate_header(www_authenticate),invalid(syntax))` `Text` uses an unsupported authentication scheme: `domain_error(http_authenticate_header(www_authenticate),unsupported_scheme(Scheme))` `Text` contains a duplicated Basic challenge directive: `domain_error(http_authenticate_header(www_authenticate),duplicate(Name))` `Text` is missing a required Basic challenge directive: `domain_error(http_authenticate_header(www_authenticate),missing(Name))` `Text` contains an unexpected Basic challenge directive: `domain_error(http_authenticate_header(www_authenticate),unexpected(Name))` `Text` contains an invalid Basic challenge charset: `domain_error(http_authenticate_header(www_authenticate),invalid(charset))` ------------------------------------------------------------------------ ###### `generate_challenge/2` Generates one canonical Basic challenge header field value from a normalized `basic_challenge/1` term. **Compilation flags:** `static` **Template:** `generate_challenge(Challenge,HeaderValue)` **Mode and number of proofs:** `generate_challenge(+compound,-atom)` - `one_or_error` **Exceptions:** `Challenge` is not a valid normalized Basic challenge term: `domain_error(http_authenticate_term(challenge),Challenge)` `Challenge` is missing a required field: `domain_error(http_authenticate_term(challenge),missing(Name))` `Challenge` contains a duplicated field: `domain_error(http_authenticate_term(challenge),duplicate(Name))` `Challenge` contains an unexpected field: `domain_error(http_authenticate_term(challenge),unexpected(Name))` `Challenge` contains an invalid field: `domain_error(http_authenticate_term(challenge),invalid(Field))` ------------------------------------------------------------------------ ###### `parse_authorization/2` Parses one Basic authorization header field value into a normalized `basic_authorization/1` term. **Compilation flags:** `static` **Template:** `parse_authorization(Text,Authorization)` **Mode and number of proofs:** `parse_authorization(++text,-compound)` - `one_or_error` **Exceptions:** `Text` is not a valid Basic authorization header value: `domain_error(http_authenticate_header(authorization),invalid(syntax))` `Text` uses an unsupported authentication scheme: `domain_error(http_authenticate_header(authorization),unsupported_scheme(Scheme))` `Text` contains invalid Basic credentials: `domain_error(http_authenticate_header(authorization),invalid(credentials))` ------------------------------------------------------------------------ ###### `generate_authorization/2` Generates one canonical Basic authorization header field value from a normalized `basic_authorization/1` term. **Compilation flags:** `static` **Template:** `generate_authorization(Authorization,HeaderValue)` **Mode and number of proofs:** `generate_authorization(+compound,-atom)` - `one_or_error` **Exceptions:** `Authorization` is not a valid normalized Basic authorization term: `domain_error(http_authenticate_term(authorization),Authorization)` `Authorization` contains an invalid Basic username: `domain_error(http_authenticate_value(username),Username)` ------------------------------------------------------------------------ ###### `protect_request/4` Verifies a normalized HTTP request using a Basic verifier object and returns either `continue(Request)` or `respond(Response)`. **Compilation flags:** `static` **Template:** `protect_request(Request,Verifier,Action,Options)` **Mode and number of proofs:** `protect_request(+compound,+object_identifier,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Verifier` is a variable: `instantiation_error` `Verifier` is neither a variable nor an existing object: `existence_error(http_authenticate_verifier,Verifier)` `Verifier` does not implement the Basic verifier protocol: `domain_error(http_authenticate_verifier,Verifier)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid Basic-auth status: `domain_error(http_authenticate_status,Status)` `Options` contains invalid Basic-auth headers: `domain_error(http_headers,Headers)` `Options` contains an invalid Basic-auth body: `domain_error(http_body,Body)` `Options` contains invalid Basic-auth properties: `domain_error(http_properties,Properties)` ------------------------------------------------------------------------ ###### `unauthorized_response/3` Builds a normalized `401`` ``Unauthorized` response and returns the generated normalized Basic challenge term. **Compilation flags:** `static` **Template:** `unauthorized_response(Challenge,Response,Options)` **Mode and number of proofs:** `unauthorized_response(-compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid Basic-auth status: `domain_error(http_authenticate_status,Status)` `Options` contains invalid Basic-auth headers: `domain_error(http_headers,Headers)` `Options` contains an invalid Basic-auth body: `domain_error(http_body,Body)` `Options` contains invalid Basic-auth properties: `domain_error(http_properties,Properties)` The generated response headers violate normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` The generated response properties violate normalized HTTP response semantics: `domain_error(http_property_semantics,Property)` ------------------------------------------------------------------------ ###### `unauthorized_response/4` Decorates a normalized HTTP response with an explicit normalized Basic challenge term and returns the resulting `401`` ``Unauthorized` response. **Compilation flags:** `static` **Template:** `unauthorized_response(Challenge,Response0,Response,Options)` **Mode and number of proofs:** `unauthorized_response(+compound,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Challenge` is not a valid normalized Basic challenge term: `domain_error(http_authenticate_term(challenge),Challenge)` `Response0` is not a valid normalized HTTP response term: `domain_error(http_response,Response0)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid unauthorized-response overlay option: `domain_error(http_authenticate_unauthorized_response_overlay_option,Option)` `Options` contains an invalid Basic-auth status: `domain_error(http_authenticate_status,Status)` `Options` contains invalid Basic-auth headers: `domain_error(http_headers,Headers)` `Options` contains an invalid Basic-auth body: `domain_error(http_body,Body)` `Options` contains invalid Basic-auth properties: `domain_error(http_properties,Properties)` The decorated response headers violate normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` The decorated response properties violate normalized HTTP response semantics: `domain_error(http_property_semantics,Property)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `http_authenticate_verifier_protocol` Protocol for HTTP Basic authentication verifiers backed by application-defined credential stores. **Availability:** `logtalk_load(http_authenticate(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-29 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `verify/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `verify/3` Succeeds when the plaintext password is valid for the given realm and username. **Compilation flags:** `static` **Template:** `verify(Realm,Username,Password)` **Mode and number of proofs:** `verify(++atom,++atom,++atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `http_htpasswd_verifier(Path)` - `Path` - Path of the password file to load on each verification request. Portable Apache `.htpasswd` subset verifier supporting `{SHA}` and `$apr1$` entries and rejecting unsupported hash markers. **Availability:** `logtalk_load(http_authenticate(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-07 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_authenticate_verifier_protocol **Imports:** `public` http_text_helpers **Uses:** base64 crypto list os reader **Remarks:** (none) **Inherited public predicates:**  verify/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `http_router_basic_auth(Verifier,BaseOptions)` - `Verifier` - Verifier object passed to `http_authenticate::protect_request/4` when a routed request declares Basic auth metadata. - `BaseOptions` - Base protect-request options merged with any route-specific `basic_auth/1` metadata options. Optional Basic-auth router helpers for objects importing the `http_router` category. **Availability:** `logtalk_load(http_authenticate(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static` **Uses:** http_authenticate http_core list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `authorize_basic_auth_request/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `authorize_basic_auth_request/2` Router helper that applies Basic-auth route metadata to a routed request and returns either `continue(Request)` or `respond(Response)`. **Compilation flags:** `static` **Template:** `authorize_basic_auth_request(Request,Action)` **Mode and number of proofs:** `authorize_basic_auth_request(+compound,-compound)` - `one_or_error` **Exceptions:** Route metadata options are not a proper list: `domain_error(http_router_basic_auth_options,Options)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The Basic verifier object is invalid: `domain_error(http_authenticate_verifier,Verifier)` The Basic verifier object does not exist: `existence_error(http_authenticate_verifier,Verifier)` The Basic-auth protection options are invalid: `domain_error(option,Option)` The Basic-auth status is invalid: `domain_error(http_authenticate_status,Status)` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_server_core_basic_handler(Verifier,Handler,ProtectOptions)` - `Verifier` - Verifier object implementing the `http_authenticate_verifier_protocol` protocol. - `Handler` - Wrapped object implementing the `http_handler_protocol` protocol. - `ProtectOptions` - Options passed to `http_authenticate::protect_request/4`. Wrapper HTTP handler object that applies Basic request verification around another portable HTTP handler. **Availability:** `logtalk_load(http_authenticate(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_handler_protocol **Uses:** http_authenticate **Remarks:** (none) **Inherited public predicates:**  handle/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_client") **object** #### `http_client` Request-oriented HTTP client facade built on top of the URL and HTTP transport libraries. **Availability:** `logtalk_load(http_client(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_message_helpers `public` http_text_helpers `public` http_origin_site_helpers **Uses:** http_core http_multipart http_websocket_handshake list url(Representation) user uuid(Representation) **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `request/4` - `request/5` - `get/3` - `get/4` - `head/3` - `head/4` - `delete/3` - `delete/4` - `post/4` - `post/5` - `put/4` - `put/5` - `patch/4` - `patch/5` - `query/4` - `query/5` - `open_websocket/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `request/4` Builds a normalized request from the given method, absolute URL, and options, selects a compatible transport, performs a one-shot exchange, and returns the response. **Compilation flags:** `static` **Template:** `request(Method,URL,Response,Options)` **Mode and number of proofs:** `request(+atom,+atom,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Options` contains invalid form-data headers: `domain_error(http_client_form_data_headers,Headers)` `Options` contains invalid form-data properties: `domain_error(http_client_form_data_properties,Properties)` The generated request is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `request/5` Builds a normalized request from the given method, absolute URL, and options, validates it against an open compatible connection or pool handle endpoint, selects a compatible transport, performs one exchange, and returns the response. **Compilation flags:** `static` **Template:** `request(ConnectionOrPool,Method,URL,Response,Options)` **Mode and number of proofs:** `request(+compound,+atom,+atom,--compound,+list)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is a variable: `instantiation_error` `ConnectionOrPool` is not a valid reusable connection or pool handle: `domain_error(http_socket_transport_connection_or_pool,ConnectionOrPool)` `ConnectionOrPool` is not connected to the requested endpoint: `domain_error(http_client_connection_target,endpoint(EndpointHost,EndpointPort,Host,Port))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Options` contains invalid form-data headers: `domain_error(http_client_form_data_headers,Headers)` `Options` contains invalid form-data properties: `domain_error(http_client_form_data_properties,Properties)` The generated request is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `get/3` Convenience wrapper over `request/4` using the `get` method. **Compilation flags:** `static` **Template:** `get(URL,Response,Options)` **Mode and number of proofs:** `get(+atom,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `get/4` Convenience wrapper over `request/5` using the `get` method. **Compilation flags:** `static` **Template:** `get(ConnectionOrPool,URL,Response,Options)` **Mode and number of proofs:** `get(+compound,+atom,--compound,+list)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is not a valid reusable connection or pool handle: `domain_error(http_socket_transport_connection_or_pool,ConnectionOrPool)` `ConnectionOrPool` is not connected to the requested endpoint: `domain_error(http_client_connection_target,endpoint(EndpointHost,EndpointPort,Host,Port))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `head/3` Convenience wrapper over `request/4` using the `head` method. **Compilation flags:** `static` **Template:** `head(URL,Response,Options)` **Mode and number of proofs:** `head(+atom,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `head/4` Convenience wrapper over `request/5` using the `head` method. **Compilation flags:** `static` **Template:** `head(ConnectionOrPool,URL,Response,Options)` **Mode and number of proofs:** `head(+compound,+atom,--compound,+list)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is not a valid reusable connection or pool handle: `domain_error(http_socket_transport_connection_or_pool,ConnectionOrPool)` `ConnectionOrPool` is not connected to the requested endpoint: `domain_error(http_client_connection_target,endpoint(EndpointHost,EndpointPort,Host,Port))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `delete/3` Convenience wrapper over `request/4` using the `delete` method. **Compilation flags:** `static` **Template:** `delete(URL,Response,Options)` **Mode and number of proofs:** `delete(+atom,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `delete/4` Convenience wrapper over `request/5` using the `delete` method. **Compilation flags:** `static` **Template:** `delete(ConnectionOrPool,URL,Response,Options)` **Mode and number of proofs:** `delete(+compound,+atom,--compound,+list)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is not a valid reusable connection or pool handle: `domain_error(http_socket_transport_connection_or_pool,ConnectionOrPool)` `ConnectionOrPool` is not connected to the requested endpoint: `domain_error(http_client_connection_target,endpoint(EndpointHost,EndpointPort,Host,Port))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `post/4` Convenience wrapper over `request/4` using the `post` method and the given request body. **Compilation flags:** `static` **Template:** `post(URL,Body,Response,Options)` **Mode and number of proofs:** `post(+atom,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `post/5` Convenience wrapper over `request/5` using the `post` method and the given request body. **Compilation flags:** `static` **Template:** `post(ConnectionOrPool,URL,Body,Response,Options)` **Mode and number of proofs:** `post(+compound,+atom,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is not a valid reusable connection or pool handle: `domain_error(http_socket_transport_connection_or_pool,ConnectionOrPool)` `ConnectionOrPool` is not connected to the requested endpoint: `domain_error(http_client_connection_target,endpoint(EndpointHost,EndpointPort,Host,Port))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `put/4` Convenience wrapper over `request/4` using the `put` method and the given request body. **Compilation flags:** `static` **Template:** `put(URL,Body,Response,Options)` **Mode and number of proofs:** `put(+atom,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `put/5` Convenience wrapper over `request/5` using the `put` method and the given request body. **Compilation flags:** `static` **Template:** `put(ConnectionOrPool,URL,Body,Response,Options)` **Mode and number of proofs:** `put(+compound,+atom,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is not a valid reusable connection or pool handle: `domain_error(http_socket_transport_connection_or_pool,ConnectionOrPool)` `ConnectionOrPool` is not connected to the requested endpoint: `domain_error(http_client_connection_target,endpoint(EndpointHost,EndpointPort,Host,Port))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `patch/4` Convenience wrapper over `request/4` using the `patch` method and the given request body. **Compilation flags:** `static` **Template:** `patch(URL,Body,Response,Options)` **Mode and number of proofs:** `patch(+atom,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `patch/5` Convenience wrapper over `request/5` using the `patch` method and the given request body. **Compilation flags:** `static` **Template:** `patch(ConnectionOrPool,URL,Body,Response,Options)` **Mode and number of proofs:** `patch(+compound,+atom,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is not a valid reusable connection or pool handle: `domain_error(http_socket_transport_connection_or_pool,ConnectionOrPool)` `ConnectionOrPool` is not connected to the requested endpoint: `domain_error(http_client_connection_target,endpoint(EndpointHost,EndpointPort,Host,Port))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `query/4` Convenience wrapper over `request/4` using the `query` method and the given request body. **Compilation flags:** `static` **Template:** `query(URL,Body,Response,Options)` **Mode and number of proofs:** `query(+atom,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `query/5` Convenience wrapper over `request/5` using the `query` method and the given request body. **Compilation flags:** `static` **Template:** `query(ConnectionOrPool,URL,Body,Response,Options)` **Mode and number of proofs:** `query(+compound,+atom,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is not a valid reusable connection or pool handle: `domain_error(http_socket_transport_connection_or_pool,ConnectionOrPool)` `ConnectionOrPool` is not connected to the requested endpoint: `domain_error(http_client_connection_target,endpoint(EndpointHost,EndpointPort,Host,Port))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` contains an invalid HTTP client request option: `domain_error(http_client_request_option,Option)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` The delegated socket exchange rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `open_websocket/4` Builds a WebSocket opening-handshake request from the given absolute WebSocket URL and options, selects a compatible transport, opens a reusable socket connection, validates the server `101` response, and returns both the connection handle and the response. **Compilation flags:** `static` **Template:** `open_websocket(URL,Connection,Response,Options)` **Mode and number of proofs:** `open_websocket(+atom,--compound,--compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute WebSocket URL: `domain_error(http_client_websocket_url,URL)` `URL` uses an unsupported WebSocket scheme: `domain_error(http_client_websocket_scheme,Scheme)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid WebSocket client option: `domain_error(http_client_websocket_option,Option)` `Options` contains an invalid WebSocket HTTP version: `domain_error(http_client_websocket_version,Version)` `Options` contains reserved WebSocket headers: `domain_error(http_client_websocket_headers,Headers)` The WebSocket server rejects the version: `domain_error(http_client_websocket_version_rejection,Response)` The WebSocket server rejects authentication: `domain_error(http_client_websocket_authentication_rejection,Response)` The WebSocket server redirects the opening handshake: `domain_error(http_client_websocket_redirection_rejection,Response)` The WebSocket server rejects the opening handshake: `domain_error(http_client_websocket_rejection,Response)` The WebSocket server response is not a valid opening handshake response: `domain_error(http_client_websocket_response,Response)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_client_core") **object** #### `http_client_core` Portable stream-based HTTP client core predicates. **Availability:** `logtalk_load(http_client_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` http_message_helpers **Uses:** http_core list **Remarks:** > - Binary streams: All stream predicates expect binary input and output streams. > > - Per-message primitives: The `write_request/2`, `read_response/2`, and `exchange/4` predicates process a single HTTP exchange. > > - Connection sequence: The `exchange_sequence/4` predicate performs sequential exchanges on the same stream pair while HTTP persistence rules allow it. **Inherited public predicates:** (none) - Public predicates - `write_request/2` - `read_response/2` - `exchange/4` - `exchange_sequence/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `write_request/2` Writes exactly one normalized HTTP request term to a binary stream. **Compilation flags:** `static` **Template:** `write_request(Output,Request)` **Mode and number of proofs:** `write_request(+stream,+compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The generated request violates normalized HTTP request semantics: `domain_error(http_header_semantics,Header)` The generated request properties violate normalized HTTP request semantics: `domain_error(http_property_semantics,Property)` ------------------------------------------------------------------------ ###### `read_response/2` Reads exactly one HTTP response from a binary stream and returns it as a normalized response term. Fails on clean end-of-file before reading any bytes. Responses may be status-bodyless, Content-Length framed, Transfer-Encoding chunked, or close-delimited by end-of-file. Close-delimited responses are annotated with a `body_framing(close_delimited)` property. **Compilation flags:** `static` **Template:** `read_response(Input,Response)` **Mode and number of proofs:** `read_response(+stream,--compound)` - `zero_or_one` **Exceptions:** The input stream does not contain a valid normalized HTTP response message: `domain_error(http_response_stream,malformed_response(Bytes))` ------------------------------------------------------------------------ ###### `exchange/4` Writes one normalized request to a binary output stream and then reads one normalized response from a binary input stream. **Compilation flags:** `static` **Template:** `exchange(Input,Output,Request,Response)` **Mode and number of proofs:** `exchange(+stream,+stream,+compound,--compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The generated request violates normalized HTTP request semantics: `domain_error(http_header_semantics,Header)` The generated request properties violate normalized HTTP request semantics: `domain_error(http_property_semantics,Property)` The input stream ends before a complete response is read: `domain_error(http_response_stream,unexpected_end_of_file)` The input stream does not contain a valid normalized HTTP response status line: `domain_error(http_response_stream,malformed_status_line(Bytes))` The input stream contains an unsupported response transfer encoding: `domain_error(http_response_stream,unsupported_transfer_encoding(Encodings))` The input stream contains an invalid response line ending: `domain_error(http_response_stream,invalid_line_ending(CarriageReturn,LineFeed))` The input stream contains a bare line feed: `domain_error(http_response_stream,bare_line_feed)` The input stream does not contain a valid normalized HTTP response message: `domain_error(http_response_stream,malformed_response(Bytes))` The response declares an invalid content length: `domain_error(non_negative_integer,Length)` ------------------------------------------------------------------------ ###### `exchange_sequence/4` Performs a sequence of request-response exchanges on the same binary stream pair. If additional requests remain when HTTP persistence rules require connection closure, an error is thrown. **Compilation flags:** `static` **Template:** `exchange_sequence(Input,Output,Requests,Responses)` **Mode and number of proofs:** `exchange_sequence(+stream,+stream,++list(compound),--list(compound))` - `one_or_error` **Exceptions:** `Requests` is not a valid list of normalized HTTP request terms: `domain_error(http_client_connection,Requests)` A request in `Requests` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` HTTP persistence requires the connection to close while requests remain to be exchanged: `domain_error(http_client_connection,remaining_requests(Requests))` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_cookies") **object** #### `http_cookies(Representation)` - `Representation` - Cookie header representation. Valid values are `atom`, `chars`, and `codes`. HTTP Cookie and `Set-Cookie` header parsing and generation predicates implementing RFC 6265 syntax. **Availability:** `logtalk_load(http_cookies(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-27 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** date list **Remarks:** > - Cookie header pairs: Cookie header values are represented as `Name-Value` pairs. > > - Set-Cookie components: Set-Cookie header values are represented by a cookie name, a cookie value, and an attribute list where attributes use `Key-Value` notation such as `expires-date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`, `max_age-Seconds`, `domain-Domain`, `path-Path`, `secure-true`, `http_only-true`, `same_site-lax`, `partitioned-true`, `priority-high`, and `extension-Attribute`. > > - Extension attributes: Unknown `Set-Cookie` attributes are preserved verbatim as `extension-Attribute` pairs as long as they do not use a reserved RFC 6265 attribute name. > > - Expires attribute: The `Expires` attribute value is normalized to a `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)` term and generated back using the canonical HTTP-date representation. **Inherited public predicates:** (none) - Public predicates - `valid_cookie/1` - `parse_cookie/2` - `generate_cookie/2` - `valid_set_cookie/1` - `parse_set_cookie/4` - `generate_set_cookie/4` - `normalize_cookie_attributes/2` - `cookie_attribute_present/2` - `cookie_attribute_value/3` - `cookie_attribute_value/4` - `cookie_expiry/2` - `cookie_expiry/3` - `cookie_deletion/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_cookie/1` True iff the argument is a valid HTTP `Cookie` header field value. **Compilation flags:** `static` **Template:** `valid_cookie(Cookie)` **Mode and number of proofs:** `valid_cookie(++text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse_cookie/2` Parses a `Cookie` header field value into a list of `Name-Value` pairs. **Compilation flags:** `static` **Template:** `parse_cookie(Cookie,Pairs)` **Mode and number of proofs:** `parse_cookie(++text,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `generate_cookie/2` Generates a canonical `Cookie` header field value from a list of `Name-Value` pairs using `;` as the separator. **Compilation flags:** `static` **Template:** `generate_cookie(Pairs,Cookie)` **Mode and number of proofs:** `generate_cookie(++list(compound),-text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_set_cookie/1` True iff the argument is a valid HTTP `Set-Cookie` header field value. **Compilation flags:** `static` **Template:** `valid_set_cookie(SetCookie)` **Mode and number of proofs:** `valid_set_cookie(++text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse_set_cookie/4` Parses a `Set-Cookie` header field value into a cookie name, a cookie value, and a list of attributes. **Compilation flags:** `static` **Template:** `parse_set_cookie(SetCookie,Name,Value,Attributes)` **Mode and number of proofs:** `parse_set_cookie(++text,-text,-text,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `generate_set_cookie/4` Generates a canonical `Set-Cookie` header field value from a cookie name, a cookie value, and a list of attributes. **Compilation flags:** `static` **Template:** `generate_set_cookie(Name,Value,Attributes,SetCookie)` **Mode and number of proofs:** `generate_set_cookie(++text,++text,++list(compound),-text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `normalize_cookie_attributes/2` Normalizes and validates a `Set-Cookie` attribute list using the canonical attribute term representation. **Compilation flags:** `static` **Template:** `normalize_cookie_attributes(Attributes,NormalizedAttributes)` **Mode and number of proofs:** `normalize_cookie_attributes(++list(compound),-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `cookie_attribute_present/2` True iff a normalized `Set-Cookie` attribute list contains an attribute with the given name. **Compilation flags:** `static` **Template:** `cookie_attribute_present(Attributes,Name)` **Mode and number of proofs:** `cookie_attribute_present(++list(compound),++atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cookie_attribute_value/3` Returns the first value for the attribute with the given name in a normalized `Set-Cookie` attribute list. **Compilation flags:** `static` **Template:** `cookie_attribute_value(Attributes,Name,Value)` **Mode and number of proofs:** `cookie_attribute_value(++list(compound),++atom,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cookie_attribute_value/4` Returns the first value for the attribute with the given name in a normalized `Set-Cookie` attribute list or the given default value when absent. **Compilation flags:** `static` **Template:** `cookie_attribute_value(Attributes,Name,Default,Value)` **Mode and number of proofs:** `cookie_attribute_value(++list(compound),++atom,++term,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cookie_expiry/2` Returns the raw normalized expiry view for a `Set-Cookie` attribute list as `session`, `max_age(Seconds)`, or `expires(DateTime)`. **Compilation flags:** `static` **Template:** `cookie_expiry(Attributes,Expiry)` **Mode and number of proofs:** `cookie_expiry(++list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cookie_expiry/3` Resolves the normalized expiry view for a `Set-Cookie` attribute list against the given current Unix time as `session`, `delete`, or `expires(UnixTime)`. **Compilation flags:** `static` **Template:** `cookie_expiry(Attributes,CurrentUnixTime,Expiry)` **Mode and number of proofs:** `cookie_expiry(++list(compound),++integer,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cookie_deletion/3` Returns a canonical `Set-Cookie` term that deletes the named cookie while echoing the relevant scoping and policy attributes from a template attribute list. **Compilation flags:** `static` **Template:** `cookie_deletion(Name,Attributes,Deletion)` **Mode and number of proofs:** `cookie_deletion(++text,++list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_core") **protocol** #### `http_body_codec_protocol` Protocol for portable HTTP body codecs. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `media_types/1` - `encode_body/4` - `decode_body/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `media_types/1` Returns the media types supported by this body codec. **Compilation flags:** `static` **Template:** `media_types(MediaTypes)` **Mode and number of proofs:** `media_types(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `encode_body/4` Encodes a semantic payload term for the given media type and options into a normalized HTTP body term. **Compilation flags:** `static` **Template:** `encode_body(MediaType,Payload,Options,Body)` **Mode and number of proofs:** `encode_body(+atom,++term,+list(compound),-compound)` - `one_or_error` **Exceptions:** `MediaType` is not a valid HTTP media type atom: `domain_error(http_media_type,MediaType)` `Payload` is not valid for `MediaType`: `domain_error(http_body_payload,Payload)` `Options` is not a valid HTTP body options list: `domain_error(http_body_options,Options)` `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` ------------------------------------------------------------------------ ###### `decode_body/4` Decodes a normalized HTTP body term for the given media type and options into a semantic payload term. **Compilation flags:** `static` **Template:** `decode_body(MediaType,Body,Options,Payload)` **Mode and number of proofs:** `decode_body(+atom,++compound,+list(compound),-term)` - `one_or_error` **Exceptions:** `MediaType` is not a valid HTTP media type atom: `domain_error(http_media_type,MediaType)` `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` `Options` is not a valid HTTP body options list: `domain_error(http_body_options,Options)` `Payload` cannot be decoded from `Body` for `MediaType`: `domain_error(http_body_payload,Payload)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `http_core` Transport-independent normalized HTTP request and response constructors, validators, wire parsers and generators, and body codec dispatch. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` http_text_helpers **Uses:** base64 http_cookies(Representation) json list reader url(Representation) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `request/7` - `response/6` - `is_request/1` - `is_response/1` - `parse_request/2` - `generate_request/2` - `parse_response/2` - `generate_response/2` - `generate_response_headers/2` - `parse_request_line/2` - `generate_request_line/2` - `parse_status_line/2` - `generate_status_line/2` - `parse_headers/2` - `generate_headers/2` - `parse_body/4` - `generate_body/3` - `request_body_bytes/4` - `response_body_bytes/4` - `encode_body/4` - `decode_body/4` - `method/2` - `target/2` - `version/2` - `status/2` - `headers/2` - `header/3` - `body/2` - `property/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `request/7` Constructs a validated normalized `request/6` term from the given method, target, version, headers, body, and properties. **Compilation flags:** `static` **Template:** `request(Method,Target,Version,Headers,Body,Properties,Request)` **Mode and number of proofs:** `request(+atom,+compound,+compound,+list(compound),+compound,+list(compound),-compound)` - `one_or_error` **Exceptions:** `Method` is not a valid HTTP method atom: `domain_error(http_method,Method)` `Target` is not a valid normalized HTTP target term: `domain_error(http_target,Target)` `Version` is not a valid HTTP version term: `domain_error(http_version,Version)` `Headers` is not a valid normalized HTTP header list: `domain_error(http_headers,Headers)` `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` `Properties` is not a valid normalized HTTP property list: `domain_error(http_properties,Properties)` The request headers violate normalized HTTP request semantics: `domain_error(http_header_semantics,Header)` The request properties violate normalized HTTP request semantics: `domain_error(http_property_semantics,Property)` ------------------------------------------------------------------------ ###### `response/6` Constructs a validated normalized `response/5` term from the given version, status, headers, body, and properties. **Compilation flags:** `static` **Template:** `response(Version,Status,Headers,Body,Properties,Response)` **Mode and number of proofs:** `response(+compound,+compound,+list(compound),+compound,+list(compound),-compound)` - `one_or_error` **Exceptions:** `Version` is not a valid HTTP version term: `domain_error(http_version,Version)` `Status` is not a valid normalized HTTP status term: `domain_error(http_status,Status)` `Headers` is not a valid normalized HTTP header list: `domain_error(http_headers,Headers)` `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` `Properties` is not a valid normalized HTTP property list: `domain_error(http_properties,Properties)` The response headers violate normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` The response properties violate normalized HTTP response semantics: `domain_error(http_property_semantics,Property)` ------------------------------------------------------------------------ ###### `is_request/1` Succeeds if the given term is a structurally and semantically valid normalized `request/6` term. **Compilation flags:** `static` **Template:** `is_request(Request)` **Mode and number of proofs:** `is_request(+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_response/1` Succeeds if the given term is a structurally and semantically valid normalized `response/5` term. **Compilation flags:** `static` **Template:** `is_response(Response)` **Mode and number of proofs:** `is_response(+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse_request/2` Parses a complete HTTP request message from the given source (`bytes(List)`, `codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) into a normalized `request/6` term. **Compilation flags:** `static` **Template:** `parse_request(Source,Request)` **Mode and number of proofs:** `parse_request(++compound,--compound)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid HTTP source term: `domain_error(http_source,Source)` The parsed request method is not a valid HTTP method atom: `domain_error(http_method,Method)` The parsed request target is not a valid normalized HTTP target term: `domain_error(http_target,Target)` The parsed request version is not a valid HTTP version term: `domain_error(http_version,Version)` The parsed request headers are not a valid normalized HTTP header list: `domain_error(http_headers,Headers)` The parsed request body is not a valid normalized HTTP body term: `domain_error(http_body,Body)` The parsed request properties are not a valid normalized HTTP property list: `domain_error(http_properties,Properties)` The parsed request headers violate normalized HTTP request semantics: `domain_error(http_header_semantics,Header)` The parsed request properties violate normalized HTTP request semantics: `domain_error(http_property_semantics,Property)` ------------------------------------------------------------------------ ###### `generate_request/2` Generates a complete HTTP request message to the given sink (`bytes(List)`, `codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) from a normalized `request/6` term. **Compilation flags:** `static` **Template:** `generate_request(Sink,Request)` **Mode and number of proofs:** `generate_request(+compound,++compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid HTTP sink term: `domain_error(http_sink,Sink)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` ------------------------------------------------------------------------ ###### `parse_response/2` Parses a complete HTTP response message from the given source (`bytes(List)`, `codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) into a normalized `response/5` term. **Compilation flags:** `static` **Template:** `parse_response(Source,Response)` **Mode and number of proofs:** `parse_response(++compound,--compound)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid HTTP source term: `domain_error(http_source,Source)` The parsed response version is not a valid HTTP version term: `domain_error(http_version,Version)` The parsed response status is not a valid normalized HTTP status term: `domain_error(http_status,Status)` The parsed response headers are not a valid normalized HTTP header list: `domain_error(http_headers,Headers)` The parsed response body is not a valid normalized HTTP body term: `domain_error(http_body,Body)` The parsed response properties are not a valid normalized HTTP property list: `domain_error(http_properties,Properties)` The parsed response headers violate normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` The parsed response properties violate normalized HTTP response semantics: `domain_error(http_property_semantics,Property)` ------------------------------------------------------------------------ ###### `generate_response/2` Generates a complete HTTP response message to the given sink (`bytes(List)`, `codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) from a normalized `response/5` term. **Compilation flags:** `static` **Template:** `generate_response(Sink,Response)` **Mode and number of proofs:** `generate_response(+compound,++compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid HTTP sink term: `domain_error(http_sink,Sink)` `Response` is not a valid normalized HTTP response term: `domain_error(http_response,Response)` ------------------------------------------------------------------------ ###### `generate_response_headers/2` Generates an HTTP response status line and effective header block, terminated by an empty line, to the given sink from a normalized `response/5` term. **Compilation flags:** `static` **Template:** `generate_response_headers(Sink,Response)` **Mode and number of proofs:** `generate_response_headers(+compound,++compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid HTTP sink term: `domain_error(http_sink,Sink)` `Response` is not a valid normalized HTTP response term: `domain_error(http_response,Response)` ------------------------------------------------------------------------ ###### `parse_request_line/2` Parses an HTTP request line from the given source (`codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) into a `request_line(Method,`` ``Target,`` ``Version)` term. **Compilation flags:** `static` **Template:** `parse_request_line(Source,RequestLine)` **Mode and number of proofs:** `parse_request_line(++compound,--compound)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid HTTP source term: `domain_error(http_source,Source)` ------------------------------------------------------------------------ ###### `generate_request_line/2` Generates an HTTP request line to the given sink (`codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) from a `request_line(Method,`` ``Target,`` ``Version)` term. **Compilation flags:** `static` **Template:** `generate_request_line(Sink,RequestLine)` **Mode and number of proofs:** `generate_request_line(+compound,++compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid HTTP sink term: `domain_error(http_sink,Sink)` ------------------------------------------------------------------------ ###### `parse_status_line/2` Parses an HTTP status line from the given source (`codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) into a `status_line(Version,`` ``Status)` term. **Compilation flags:** `static` **Template:** `parse_status_line(Source,StatusLine)` **Mode and number of proofs:** `parse_status_line(++compound,--compound)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid HTTP source term: `domain_error(http_source,Source)` ------------------------------------------------------------------------ ###### `generate_status_line/2` Generates an HTTP status line to the given sink (`codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) from a `status_line(Version,`` ``Status)` term. **Compilation flags:** `static` **Template:** `generate_status_line(Sink,StatusLine)` **Mode and number of proofs:** `generate_status_line(+compound,++compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid HTTP sink term: `domain_error(http_sink,Sink)` ------------------------------------------------------------------------ ###### `parse_headers/2` Parses an HTTP header block from the given source (`codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) into normalized header `Name-Value` pairs with typed values for recognized headers. **Compilation flags:** `static` **Template:** `parse_headers(Source,Headers)` **Mode and number of proofs:** `parse_headers(++compound,-list(compound))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid HTTP source term: `domain_error(http_source,Source)` ------------------------------------------------------------------------ ###### `generate_headers/2` Generates an HTTP header block to the given sink (`codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) from normalized header `Name-Value` pairs. **Compilation flags:** `static` **Template:** `generate_headers(Sink,Headers)` **Mode and number of proofs:** `generate_headers(+compound,++list(compound))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid HTTP sink term: `domain_error(http_sink,Sink)` `Headers` is not a valid normalized HTTP header list: `domain_error(http_headers,Headers)` ------------------------------------------------------------------------ ###### `parse_body/4` Parses a body payload from the given source (`bytes(List)`, `codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) according to the given media type and options into a normalized body term. **Compilation flags:** `static` **Template:** `parse_body(Source,MediaType,Options,Body)` **Mode and number of proofs:** `parse_body(++compound,++atom,+list(compound),--compound)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid HTTP source term: `domain_error(http_source,Source)` `MediaType` is not a valid HTTP media type atom: `domain_error(http_media_type,MediaType)` `Options` is not a valid HTTP body options list: `domain_error(http_body_options,Options)` No registered HTTP body codec exists for `MediaType` when codec-based decoding is required: `existence_error(http_body_codec,MediaType)` ------------------------------------------------------------------------ ###### `generate_body/3` Generates a body payload to the given sink (`bytes(List)`, `codes(List)`, `chars(List)`, `atom(Atom)`, `file(Path)`, or `stream(Stream)`) from a normalized body term and options. **Compilation flags:** `static` **Template:** `generate_body(Sink,Body,Options)` **Mode and number of proofs:** `generate_body(+compound,++compound,+list(compound))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid HTTP sink term: `domain_error(http_sink,Sink)` `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` `Options` is not a valid HTTP body options list: `domain_error(http_body_options,Options)` No registered HTTP body codec exists for the body media type when codec-based encoding is required: `existence_error(http_body_codec,MediaType)` ------------------------------------------------------------------------ ###### `request_body_bytes/4` Generates the transfer-decoded entity-body bytes for a normalized HTTP request body using the request headers and properties to select body serialization options. **Compilation flags:** `static` **Template:** `request_body_bytes(Headers,Body,Properties,Bytes)` **Mode and number of proofs:** `request_body_bytes(+list(compound),++compound,+list(compound),--list(byte))` - `one_or_error` **Exceptions:** `Headers` is not a valid normalized HTTP header list: `domain_error(http_headers,Headers)` `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` `Properties` is not a valid normalized HTTP property list: `domain_error(http_properties,Properties)` ------------------------------------------------------------------------ ###### `response_body_bytes/4` Generates the transfer-decoded entity-body bytes for a normalized HTTP response body using the response headers and properties to select body serialization options. **Compilation flags:** `static` **Template:** `response_body_bytes(Headers,Body,Properties,Bytes)` **Mode and number of proofs:** `response_body_bytes(+list(compound),++compound,+list(compound),--list(byte))` - `one_or_error` **Exceptions:** `Headers` is not a valid normalized HTTP header list: `domain_error(http_headers,Headers)` `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` `Properties` is not a valid normalized HTTP property list: `domain_error(http_properties,Properties)` ------------------------------------------------------------------------ ###### `encode_body/4` Encodes a semantic payload term using the registered concrete body codec for the given media type into a normalized body term. **Compilation flags:** `static` **Template:** `encode_body(MediaType,Payload,Options,Body)` **Mode and number of proofs:** `encode_body(+atom,++term,+list(compound),-compound)` - `one_or_error` **Exceptions:** `MediaType` is not a valid HTTP media type atom: `domain_error(http_media_type,MediaType)` `Options` is not a valid HTTP body options list: `domain_error(http_body_options,Options)` No registered HTTP body codec exists for `MediaType`: `existence_error(http_body_codec,MediaType)` ------------------------------------------------------------------------ ###### `decode_body/4` Decodes a normalized body term using the registered concrete body codec for the given media type into a semantic payload term. **Compilation flags:** `static` **Template:** `decode_body(MediaType,Body,Options,Payload)` **Mode and number of proofs:** `decode_body(+atom,++compound,+list(compound),--term)` - `one_or_error` **Exceptions:** `MediaType` is not a valid HTTP media type atom: `domain_error(http_media_type,MediaType)` `Options` is not a valid HTTP body options list: `domain_error(http_body_options,Options)` No registered HTTP body codec exists for `MediaType`: `existence_error(http_body_codec,MediaType)` ------------------------------------------------------------------------ ###### `method/2` Returns the request method from a normalized `request/6` term. **Compilation flags:** `static` **Template:** `method(Request,Method)` **Mode and number of proofs:** `method(+compound,-atom)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `target/2` Returns the request target from a normalized `request/6` term. **Compilation flags:** `static` **Template:** `target(Request,Target)` **Mode and number of proofs:** `target(+compound,-compound)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `version/2` Returns the HTTP version from a normalized request or response term. **Compilation flags:** `static` **Template:** `version(Message,Version)` **Mode and number of proofs:** `version(+compound,-compound)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `status/2` Returns the response status from a normalized `response/5` term. **Compilation flags:** `static` **Template:** `status(Response,Status)` **Mode and number of proofs:** `status(+compound,-compound)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `headers/2` Returns the normalized header list from a request or response term. **Compilation flags:** `static` **Template:** `headers(Message,Headers)` **Mode and number of proofs:** `headers(+compound,-list(compound))` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `header/3` Enumerates normalized header `Name` and `Value` pairs from a request or response term. **Compilation flags:** `static` **Template:** `header(Message,Name,Value)` **Mode and number of proofs:** `header(+compound,?atom,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `body/2` Returns the normalized body term from a request or response term. **Compilation flags:** `static` **Template:** `body(Message,Body)` **Mode and number of proofs:** `body(+compound,-compound)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `property/2` Enumerates normalized derived or higher-layer properties from a request or response term. **Compilation flags:** `static` **Template:** `property(Message,Property)` **Mode and number of proofs:** `property(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `http_docroot_paths` Shared helpers for validating requests and sandboxing document-root relative paths. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-05 **Compilation flags:** `static` **Uses:** http_core os **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `validate_relative_path/1` - `validate_request/1` - `validate_document_root/1` - `supported_method/1` - `resolved_target_path/3` - `path_within_root/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `validate_relative_path/1` Validates a document-root relative request path atom. **Compilation flags:** `static` **Template:** `validate_relative_path(Path)` **Mode and number of proofs:** `validate_relative_path(+atom)` - `one_or_error` **Exceptions:** `Path` is a variable: `instantiation_error` `Path` is neither a variable nor an atom: `type_error(atom,Path)` `Path` is not a safe document-root relative path: `domain_error(http_docroot_relative_path,Path)` ------------------------------------------------------------------------ ###### `validate_request/1` Validates a normalized HTTP request term. **Compilation flags:** `static` **Template:** `validate_request(Request)` **Mode and number of proofs:** `validate_request(+compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` ------------------------------------------------------------------------ ###### `validate_document_root/1` Validates an absolute document root path atom. **Compilation flags:** `static` **Template:** `validate_document_root(DocumentRoot)` **Mode and number of proofs:** `validate_document_root(+atom)` - `one_or_error` **Exceptions:** `DocumentRoot` is a variable: `instantiation_error` `DocumentRoot` is neither a variable nor an atom: `type_error(atom,DocumentRoot)` `DocumentRoot` is not a valid absolute document root path: `domain_error(http_docroot_document_root,DocumentRoot)` ------------------------------------------------------------------------ ###### `supported_method/1` True when the request method is supported for document-root serving, currently `get` or `head`. **Compilation flags:** `static` **Template:** `supported_method(Request)` **Mode and number of proofs:** `supported_method(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `resolved_target_path/3` Resolves a request path against a document root and succeeds only when the resulting path stays within that root. **Compilation flags:** `static` **Template:** `resolved_target_path(Path,Root,Candidate)` **Mode and number of proofs:** `resolved_target_path(+atom,+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `path_within_root/2` True when the candidate path is the document root itself or a path nested under it. **Compilation flags:** `static` **Template:** `path_within_root(Root,Candidate)` **Mode and number of proofs:** `path_within_root(+atom,+atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_form_body_codec` Concrete HTTP body codec for application/x-www-form-urlencoded payloads. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-23 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_body_codec_protocol **Uses:** type **Remarks:** (none) **Inherited public predicates:**  decode_body/4  encode_body/4  media_types/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `http_handler_protocol` Protocol for portable HTTP request handlers. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `handle/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `handle/2` Handles a normalized HTTP request term and returns a normalized HTTP response term. **Compilation flags:** `static` **Template:** `handle(Request,Response)` **Mode and number of proofs:** `handle(+compound,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Response` is not a valid normalized HTTP response term: `domain_error(http_response,Response)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `http_json_body_codec` Concrete HTTP body codec for JSON payloads. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-23 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_body_codec_protocol **Remarks:** (none) **Inherited public predicates:**  decode_body/4  encode_body/4  media_types/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `http_json_term_helpers` Internal shared helpers for the repository-standard JSON term representation used by the HTTP, OpenAPI, and HTTP router libraries. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-23 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `json_object_pairs/2` - `pairs_to_object/2` - `curly_pairs_to_list/2` - `list_to_curly_pairs/2` - `pair_key_value/3` - `normalize_json_value/2` - `normalize_json_pairs/2` - Private predicates - Operators ##### Public predicates (none) ##### Protected predicates ###### `json_object_pairs/2` Converts between supported JSON object term representations and a flat list of key-value pairs. **Compilation flags:** `static` **Template:** `json_object_pairs(Object,Pairs)` **Mode and number of proofs:** `json_object_pairs(+term,-list(compound))` - `zero_or_one` `json_object_pairs(-term,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `pairs_to_object/2` Converts a list of JSON object key-value pairs into the repository-standard object representation. **Compilation flags:** `static` **Template:** `pairs_to_object(Pairs,Object)` **Mode and number of proofs:** `pairs_to_object(+list(compound),-term)` - `one` ------------------------------------------------------------------------ ###### `curly_pairs_to_list/2` Converts a nested curly-pair term into a plain list of pairs. **Compilation flags:** `static` **Template:** `curly_pairs_to_list(CurlyPairs,Pairs)` **Mode and number of proofs:** `curly_pairs_to_list(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `list_to_curly_pairs/2` Converts a plain list of pairs into the nested curly-pair representation. **Compilation flags:** `static` **Template:** `list_to_curly_pairs(Pairs,CurlyPairs)` **Mode and number of proofs:** `list_to_curly_pairs(+list(compound),-compound)` - `one` ------------------------------------------------------------------------ ###### `pair_key_value/3` Normalizes supported key-value pair syntaxes into explicit key and value terms. **Compilation flags:** `static` **Template:** `pair_key_value(Pair,Key,Value)` **Mode and number of proofs:** `pair_key_value(+compound,-term,-term)` - `one` ------------------------------------------------------------------------ ###### `normalize_json_value/2` Normalizes arbitrary JSON-like values into the repository-standard JSON representation, including booleans and null. **Compilation flags:** `static` **Template:** `normalize_json_value(Value,JsonValue)` **Mode and number of proofs:** `normalize_json_value(+term,-term)` - `one` ------------------------------------------------------------------------ ###### `normalize_json_pairs/2` Normalizes the values of a JSON object pair list into the repository-standard JSON representation. **Compilation flags:** `static` **Template:** `normalize_json_pairs(Pairs,JsonPairs)` **Mode and number of proofs:** `normalize_json_pairs(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ##### Private predicates (none) ##### Operators (none) **category** #### `http_message_helpers` Internal shared helpers for HTTP transport persistence rules, connection token normalization, and chunk-size line parsing. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-23 **Compilation flags:** `static` **Extends:** `public` http_text_helpers **Uses:** http_core list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `connection_persistent/2` - `request_persistent/1` - `response_persistent/1` - `version_persistent_by_default/1` - `message_has_connection_token/2` - `message_connection_tokens/2` - `message_header_values/3` - `chunk_size_line_size/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `connection_persistent/2` Succeeds when a request-response exchange can continue on the same connection according to HTTP persistence semantics. **Compilation flags:** `static` **Template:** `connection_persistent(Request,Response)` **Mode and number of proofs:** `connection_persistent(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `request_persistent/1` Succeeds when a normalized HTTP request keeps the connection persistent. **Compilation flags:** `static` **Template:** `request_persistent(Request)` **Mode and number of proofs:** `request_persistent(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `response_persistent/1` Succeeds when a normalized HTTP response keeps the connection persistent. **Compilation flags:** `static` **Template:** `response_persistent(Response)` **Mode and number of proofs:** `response_persistent(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `version_persistent_by_default/1` Succeeds when the given HTTP version uses persistent connections by default. **Compilation flags:** `static` **Template:** `version_persistent_by_default(Version)` **Mode and number of proofs:** `version_persistent_by_default(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `message_has_connection_token/2` Succeeds when a normalized HTTP message exposes the given normalized Connection token through either headers or derived properties. **Compilation flags:** `static` **Template:** `message_has_connection_token(Message,Token)` **Mode and number of proofs:** `message_has_connection_token(+compound,+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `message_connection_tokens/2` Returns the de-duplicated normalized Connection tokens exposed by a normalized HTTP message. **Compilation flags:** `static` **Template:** `message_connection_tokens(Message,Tokens)` **Mode and number of proofs:** `message_connection_tokens(+compound,-list(atom))` - `one` ------------------------------------------------------------------------ ###### `message_header_values/3` Returns the stored header values for the given header name in message order. **Compilation flags:** `static` **Template:** `message_header_values(Message,Name,Values)` **Mode and number of proofs:** `message_header_values(+compound,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `chunk_size_line_size/2` Parses a chunk-size line into its hexadecimal size, ignoring optional whitespace and chunk extensions. **Compilation flags:** `static` **Template:** `chunk_size_line_size(LineBytes,Size)` **Mode and number of proofs:** `chunk_size_line_size(+list(integer),-integer)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_octet_stream_body_codec` Concrete HTTP body codec for octet-stream payloads. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-23 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_body_codec_protocol **Uses:** type **Remarks:** (none) **Inherited public predicates:**  decode_body/4  encode_body/4  media_types/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `http_origin_site_helpers` Internal shared helpers for parsing HTTP origins and absolute URLs, deriving request endpoints, and comparing endpoints for schemeful same-site semantics. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-09 **Compilation flags:** `static` **Extends:** `public` http_text_helpers **Uses:** atom http_core list url(Representation) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `absolute_url_context/2` - `origin_endpoint/2` - `request_endpoint/2` - `same_site/2` - `host_labels/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `absolute_url_context/2` Parses an absolute HTTP or HTTPS URL atom into a normalized endpoint and request path context. **Compilation flags:** `static` **Template:** `absolute_url_context(URL,Context)` **Mode and number of proofs:** `absolute_url_context(+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `origin_endpoint/2` Parses an Origin header atom into a normalized HTTP or HTTPS endpoint. **Compilation flags:** `static` **Template:** `origin_endpoint(Origin,Endpoint)` **Mode and number of proofs:** `origin_endpoint(+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `request_endpoint/2` Derives a normalized HTTP or HTTPS endpoint from normalized request properties. **Compilation flags:** `static` **Template:** `request_endpoint(Request,Endpoint)` **Mode and number of proofs:** `request_endpoint(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `same_site/2` Succeeds when two normalized endpoints or URL contexts are schemefully same-site using bundled public suffix rules, including exact, wildcard, and exception cases. **Compilation flags:** `static` **Template:** `same_site(Left,Right)` **Mode and number of proofs:** `same_site(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `host_labels/2` Splits a normalized host atom into non-empty dot-separated labels. **Compilation flags:** `static` **Template:** `host_labels(Host,Labels)` **Mode and number of proofs:** `host_labels(+atom,-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `http_request_protocol` Protocol for Logtalk objects exposing normalized HTTP request data. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-23 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `method/1` - `target/1` - `version/1` - `headers/1` - `header/2` - `body/1` - `property/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `method/1` Returns the normalized lowercase HTTP method atom. **Compilation flags:** `static` **Template:** `method(Method)` **Mode and number of proofs:** `method(-atom)` - `one` ------------------------------------------------------------------------ ###### `target/1` Returns the normalized request target descriptor. **Compilation flags:** `static` **Template:** `target(Target)` **Mode and number of proofs:** `target(-compound)` - `one` ------------------------------------------------------------------------ ###### `version/1` Returns the normalized HTTP version term `http(Major,`` ``Minor)`. **Compilation flags:** `static` **Template:** `version(Version)` **Mode and number of proofs:** `version(-compound)` - `one` ------------------------------------------------------------------------ ###### `headers/1` Returns the request header list as normalized `Name-Value` pairs. **Compilation flags:** `static` **Template:** `headers(Headers)` **Mode and number of proofs:** `headers(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `header/2` Enumerates normalized request headers as `Name` and `Value` pairs. **Compilation flags:** `static` **Template:** `header(Name,Value)` **Mode and number of proofs:** `header(?atom,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `body/1` Returns the normalized request body term. **Compilation flags:** `static` **Template:** `body(Body)` **Mode and number of proofs:** `body(-compound)` - `one` ------------------------------------------------------------------------ ###### `property/1` Enumerates derived or higher-layer normalized request properties. **Compilation flags:** `static` **Template:** `property(Property)` **Mode and number of proofs:** `property(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `http_response_protocol` Protocol for Logtalk objects exposing normalized HTTP response data. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-23 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `version/1` - `status/1` - `headers/1` - `header/2` - `body/1` - `property/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `version/1` Returns the normalized HTTP version term `http(Major,`` ``Minor)`. **Compilation flags:** `static` **Template:** `version(Version)` **Mode and number of proofs:** `version(-compound)` - `one` ------------------------------------------------------------------------ ###### `status/1` Returns the normalized HTTP status term `status(Code,`` ``ReasonPhrase)`. **Compilation flags:** `static` **Template:** `status(Status)` **Mode and number of proofs:** `status(-compound)` - `one` ------------------------------------------------------------------------ ###### `headers/1` Returns the response header list as normalized `Name-Value` pairs. **Compilation flags:** `static` **Template:** `headers(Headers)` **Mode and number of proofs:** `headers(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `header/2` Enumerates normalized response headers as `Name` and `Value` pairs. **Compilation flags:** `static` **Template:** `header(Name,Value)` **Mode and number of proofs:** `header(?atom,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `body/1` Returns the normalized response body term. **Compilation flags:** `static` **Template:** `body(Body)` **Mode and number of proofs:** `body(-compound)` - `one` ------------------------------------------------------------------------ ###### `property/1` Enumerates derived or higher-layer normalized response properties. **Compilation flags:** `static` **Template:** `property(Property)` **Mode and number of proofs:** `property(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `http_text_body_codec` Concrete HTTP body codec for text payloads. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-23 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_body_codec_protocol **Uses:** type **Remarks:** (none) **Inherited public predicates:**  decode_body/4  encode_body/4  media_types/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `http_text_helpers` Internal shared helpers for ASCII case normalization and HTTP optional whitespace trimming. **Availability:** `logtalk_load(http_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-05 **Compilation flags:** `static` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `ows_code/1` - `lowercase_ascii_codes/2` - `uppercase_ascii_codes/2` - `trim_trailing_ows_codes/2` - `trim_ows_codes/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `ows_code/1` Succeeds when the code is HTTP optional whitespace (SP or HTAB). **Compilation flags:** `static` **Template:** `ows_code(Code)` **Mode and number of proofs:** `ows_code(+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `lowercase_ascii_codes/2` Converts uppercase ASCII letter codes in a list to lowercase, leaving all other codes unchanged. **Compilation flags:** `static` **Template:** `lowercase_ascii_codes(Codes,LowercaseCodes)` **Mode and number of proofs:** `lowercase_ascii_codes(+list(integer),-list(integer))` - `one` ------------------------------------------------------------------------ ###### `uppercase_ascii_codes/2` Converts lowercase ASCII letter codes in a list to uppercase, leaving all other codes unchanged. **Compilation flags:** `static` **Template:** `uppercase_ascii_codes(Codes,UppercaseCodes)` **Mode and number of proofs:** `uppercase_ascii_codes(+list(integer),-list(integer))` - `one` ------------------------------------------------------------------------ ###### `trim_trailing_ows_codes/2` Removes trailing HTTP optional whitespace codes from a list. **Compilation flags:** `static` **Template:** `trim_trailing_ows_codes(Codes,TrimmedCodes)` **Mode and number of proofs:** `trim_trailing_ows_codes(+list(integer),-list(integer))` - `one` ------------------------------------------------------------------------ ###### `trim_ows_codes/2` Removes leading and trailing HTTP optional whitespace codes from a list. **Compilation flags:** `static` **Template:** `trim_ows_codes(Codes,TrimmedCodes)` **Mode and number of proofs:** `trim_ows_codes(+list(integer),-list(integer))` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_cors") **object** #### `http_cors` Transport-neutral CORS request classification, preflight response generation, and response decoration helpers for normalized HTTP messages. **Availability:** `logtalk_load(http_cors(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_origin_site_helpers **Uses:** atom http_core list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `request_origin/2` - `is_cors_request/1` - `is_preflight_request/1` - `preflight_response/3` - `add_response_headers/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `request_origin/2` Returns the single request `Origin` header value when present. **Compilation flags:** `static` **Template:** `request_origin(Request,Origin)` **Mode and number of proofs:** `request_origin(+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_cors_request/1` Succeeds when the request carries a single `Origin` header value. **Compilation flags:** `static` **Template:** `is_cors_request(Request)` **Mode and number of proofs:** `is_cors_request(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_preflight_request/1` Succeeds when the request is a CORS preflight request with method `options` and a single `Access-Control-Request-Method` header value. **Compilation flags:** `static` **Template:** `is_preflight_request(Request)` **Mode and number of proofs:** `is_preflight_request(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `preflight_response/3` Builds a normalized CORS preflight response using the given policy options. Allowed preflight requests return `200`` ``OK` with the relevant `Access-Control-*` headers and denied requests return `403`` ``Forbidden`. Non-preflight requests raise an error. **Compilation flags:** `static` **Template:** `preflight_response(Request,Response,Options)` **Mode and number of proofs:** `preflight_response(+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is not a CORS preflight request: `domain_error(http_cors_preflight_request,Request)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid CORS option combination: `domain_error(http_cors_options,Options)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `add_response_headers/4` Decorates a normalized response with the relevant CORS response headers when the request matches and the policy allows it. Denied requests preserve or add cache-relevant `Vary` metadata but do not add permission headers. **Compilation flags:** `static` **Template:** `add_response_headers(Request,Response0,Response,Options)` **Mode and number of proofs:** `add_response_headers(+compound,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid CORS option combination: `domain_error(http_cors_options,Options)` `Response0` is not a valid normalized HTTP response term: `domain_error(http_response,Response0)` The decorated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_digest") **object** #### `http_client_digest_session` By deafult, Stateful HTTP Digest client sessions use the `http_socket_transport` library. **Availability:** `logtalk_load(http_digest(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_client_digest_session(http_socket_transport) **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  close/1  cookie_jar/2  default_option/1  default_options/1  delete/4  get/4  head/4  open/3  open/4  option/2  option/3  patch/5  post/5  put/5  request/5  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_client_digest_session(HTTPTransport)` Stateful HTTP Digest client sessions that add cookie persistence and one-round-trip Digest challenge retry on top of the normalized HTTP client and socket libraries. **Availability:** `logtalk_load(http_digest(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_text_helpers **Uses:** http_cookie_jar http_cookies(Representation) http_core http_digest http_multipart list url(Representation) user uuid(Representation) **Remarks:** > - Option precedence: When the same session default, Digest default, or per-request option is given multiple times, the first occurrence is used. > > - Reactive authentication: Requests are sent once without credentials and retried automatically only when the response carries a `401` Digest challenge accepted by the core `http_digest` object. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `open/3` - `open/4` - `close/1` - `cookie_jar/2` - `request/5` - `get/4` - `head/4` - `delete/4` - `post/5` - `put/5` - `patch/5` - Protected predicates - Private predicates - `session_seed_/1` - `session_state_/2` - Operators ##### Public predicates ###### `open/3` Opens a new Digest client session with the given username and password and a freshly created owned cookie jar. **Compilation flags:** `static` **Template:** `open(Session,Username,Password)` **Mode and number of proofs:** `open(-compound,++text,++text)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `open/4` Opens a new Digest client session using the given credentials plus cookie-jar, request-default, and default Digest authorization options. **Compilation flags:** `static` **Template:** `open(Session,Username,Password,Options)` **Mode and number of proofs:** `open(-compound,++text,++text,+list(compound))` - `one_or_error` **Exceptions:** `Username` or `Password` is neither a variable nor text: `type_error(text,Text)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid Digest client session option: `domain_error(http_client_digest_session_option,Option)` `Options` contains an invalid Digest client session option combination: `domain_error(http_client_digest_session_options,Options)` `Options` contains invalid persisted cookie data: `domain_error(http_cookie_jar_persisted_cookies,PersistedCookies)` ------------------------------------------------------------------------ ###### `close/1` Closes a Digest client session and, when applicable, the owned cookie jar created for it. **Compilation flags:** `static` **Template:** `close(Session)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `Session` refers to a closed Digest client session handle: `existence_error(http_client_digest_session,http_client_digest_session(SessionId))` ------------------------------------------------------------------------ ###### `cookie_jar/2` Returns the configured cookie jar handle or the atom `none` when the session does not persist cookies. **Compilation flags:** `static` **Template:** `cookie_jar(Session,Jar)` **Mode and number of proofs:** `cookie_jar(+compound,-term)` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `Session` refers to a closed Digest client session handle: `existence_error(http_client_digest_session,http_client_digest_session(SessionId))` ------------------------------------------------------------------------ ###### `request/5` Performs one HTTP request using session defaults, cookie replay/storage, and automatic retry when the server replies with a Digest challenge. **Compilation flags:** `static` **Template:** `request(Session,Method,URL,Response,Options)` **Mode and number of proofs:** `request(+compound,+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `Session` refers to a closed Digest client session handle: `existence_error(http_client_digest_session,http_client_digest_session(SessionId))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` `Options` is a variable or a partial list: `instantiation_error` `Options` contains invalid Digest client session request options: `domain_error(http_client_digest_session_request_options,Options)` `Options` contains an invalid Digest client session request option: `domain_error(http_client_digest_session_request_option,Option)` `Options` contains invalid form-data headers: `domain_error(http_client_form_data_headers,Headers)` `Options` contains invalid form-data properties: `domain_error(http_client_form_data_properties,Properties)` The Digest challenge contains an unsupported algorithm: `domain_error(http_digest_algorithm,Algorithm)` The Digest challenge contains an unsupported qop value: `domain_error(http_digest_qop,Qop)` ------------------------------------------------------------------------ ###### `get/4` Convenience wrapper over `request/5` using the `get` method. **Compilation flags:** `static` **Template:** `get(Session,URL,Response,Options)` **Mode and number of proofs:** `get(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Options` contains invalid Digest client session request options: `domain_error(http_client_digest_session_request_options,Options)` ------------------------------------------------------------------------ ###### `head/4` Convenience wrapper over `request/5` using the `head` method. **Compilation flags:** `static` **Template:** `head(Session,URL,Response,Options)` **Mode and number of proofs:** `head(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Options` contains invalid Digest client session request options: `domain_error(http_client_digest_session_request_options,Options)` ------------------------------------------------------------------------ ###### `delete/4` Convenience wrapper over `request/5` using the `delete` method. **Compilation flags:** `static` **Template:** `delete(Session,URL,Response,Options)` **Mode and number of proofs:** `delete(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Options` contains invalid Digest client session request options: `domain_error(http_client_digest_session_request_options,Options)` ------------------------------------------------------------------------ ###### `post/5` Convenience wrapper over `request/5` using the `post` method and the given body. **Compilation flags:** `static` **Template:** `post(Session,URL,Body,Response,Options)` **Mode and number of proofs:** `post(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` `Options` contains invalid Digest client session request options: `domain_error(http_client_digest_session_request_options,Options)` ------------------------------------------------------------------------ ###### `put/5` Convenience wrapper over `request/5` using the `put` method and the given body. **Compilation flags:** `static` **Template:** `put(Session,URL,Body,Response,Options)` **Mode and number of proofs:** `put(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` `Options` contains invalid Digest client session request options: `domain_error(http_client_digest_session_request_options,Options)` ------------------------------------------------------------------------ ###### `patch/5` Convenience wrapper over `request/5` using the `patch` method and the given body. **Compilation flags:** `static` **Template:** `patch(Session,URL,Body,Response,Options)` **Mode and number of proofs:** `patch(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open Digest client session handle: `domain_error(http_client_digest_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` `Options` contains invalid Digest client session request options: `domain_error(http_client_digest_session_request_options,Options)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `session_seed_/1` Last allocated Digest client session identifier. **Compilation flags:** `dynamic` **Template:** `session_seed_(SessionId)` **Mode and number of proofs:** `session_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `session_state_/2` Per-session stored cookie jar ownership, credentials, default request state, and default Digest authorization options. **Compilation flags:** `dynamic` **Template:** `session_state_(SessionId,State)` **Mode and number of proofs:** `session_state_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `http_digest` HTTP Digest authentication parsing, generation, request decoration, and verification helpers. **Availability:** `logtalk_load(http_digest(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_text_helpers **Uses:** crypto date hmac http_core list os sha256 user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `challenge/2` - `authorization/2` - `authentication_info/2` - `parse_challenge/2` - `generate_challenge/2` - `parse_authorization/2` - `generate_authorization/2` - `parse_authentication_info/2` - `generate_authentication_info/2` - `authorize_request/6` - `protect_request/4` - `unauthorized_response/3` - `unauthorized_response/4` - `add_authentication_info/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `challenge/2` Returns the single parsed Digest `WWW-Authenticate` challenge from a normalized HTTP response when present. **Compilation flags:** `static` **Template:** `challenge(Response,Challenge)` **Mode and number of proofs:** `challenge(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `authorization/2` Returns the single parsed Digest `Authorization` header from a normalized HTTP request when present. **Compilation flags:** `static` **Template:** `authorization(Request,Authorization)` **Mode and number of proofs:** `authorization(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `authentication_info/2` Returns the parsed `Authentication-Info` header from a normalized HTTP response when present. **Compilation flags:** `static` **Template:** `authentication_info(Response,AuthenticationInfo)` **Mode and number of proofs:** `authentication_info(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse_challenge/2` Parses one Digest challenge header field value into a normalized `digest_challenge/1` term. **Compilation flags:** `static` **Template:** `parse_challenge(Text,Challenge)` **Mode and number of proofs:** `parse_challenge(++text,-compound)` - `one_or_error` **Exceptions:** `Text` is neither a variable nor text: `type_error(text,Text)` `Text` is not a valid Digest challenge header value: `domain_error(http_digest_header(www_authenticate),invalid(syntax))` `Text` uses an unsupported authentication scheme: `domain_error(http_digest_header(www_authenticate),unsupported_scheme(Scheme))` `Text` contains a duplicated Digest challenge directive: `domain_error(http_digest_header(www_authenticate),duplicate(Name))` `Text` contains an unexpected Digest challenge directive: `domain_error(http_digest_header(www_authenticate),unexpected(Name))` `Text` is missing a required Digest challenge directive: `domain_error(http_digest_header(www_authenticate),missing(Name))` `Text` contains an invalid Digest challenge directive value: `domain_error(http_digest_header(www_authenticate),invalid(Name))` ------------------------------------------------------------------------ ###### `generate_challenge/2` Generates one canonical Digest challenge header field value from a normalized `digest_challenge/1` term. **Compilation flags:** `static` **Template:** `generate_challenge(Challenge,HeaderValue)` **Mode and number of proofs:** `generate_challenge(+compound,-atom)` - `one_or_error` **Exceptions:** `Challenge` is not a valid normalized Digest challenge term: `domain_error(http_digest_term(challenge),Challenge)` `Challenge` is missing a required field: `domain_error(http_digest_term(challenge),missing(Name))` `Challenge` contains a duplicated field: `domain_error(http_digest_term(challenge),duplicate(Name))` `Challenge` contains an unexpected field: `domain_error(http_digest_term(challenge),unexpected(Name))` `Challenge` contains an invalid field: `domain_error(http_digest_term(challenge),invalid(Name))` `Challenge` fields are not in canonical order: `domain_error(http_digest_term(challenge),invalid_order)` `Challenge` contains an invalid algorithm: `domain_error(http_digest_algorithm,Algorithm)` `Challenge` contains an invalid qop value: `domain_error(http_digest_qop,Qop)` `Challenge` contains an invalid charset: `domain_error(http_digest_charset,Charset)` ------------------------------------------------------------------------ ###### `parse_authorization/2` Parses one Digest authorization header field value into a normalized `digest_authorization/1` term. **Compilation flags:** `static` **Template:** `parse_authorization(Text,Authorization)` **Mode and number of proofs:** `parse_authorization(++text,-compound)` - `one_or_error` **Exceptions:** `Text` is neither a variable nor text: `type_error(text,Text)` `Text` is not a valid Digest authorization header value: `domain_error(http_digest_header(authorization),invalid(syntax))` `Text` uses an unsupported authentication scheme: `domain_error(http_digest_header(authorization),unsupported_scheme(Scheme))` `Text` contains a duplicated Digest authorization directive: `domain_error(http_digest_header(authorization),duplicate(Name))` `Text` contains an unexpected Digest authorization directive: `domain_error(http_digest_header(authorization),unexpected(Name))` `Text` is missing a required Digest authorization directive: `domain_error(http_digest_header(authorization),missing(Name))` `Text` contains an invalid Digest authorization directive value: `domain_error(http_digest_header(authorization),invalid(Name))` ------------------------------------------------------------------------ ###### `generate_authorization/2` Generates one canonical Digest authorization header field value from a normalized `digest_authorization/1` term. **Compilation flags:** `static` **Template:** `generate_authorization(Authorization,HeaderValue)` **Mode and number of proofs:** `generate_authorization(+compound,-atom)` - `one_or_error` **Exceptions:** `Authorization` is not a valid normalized Digest authorization term: `domain_error(http_digest_term(authorization),Authorization)` `Authorization` is missing a required field: `domain_error(http_digest_term(authorization),missing(Name))` `Authorization` contains a duplicated field: `domain_error(http_digest_term(authorization),duplicate(Name))` `Authorization` contains an unexpected field: `domain_error(http_digest_term(authorization),unexpected(Name))` `Authorization` contains an invalid field: `domain_error(http_digest_term(authorization),invalid(Name))` `Authorization` fields are not in canonical order: `domain_error(http_digest_term(authorization),invalid_order)` `Authorization` contains inconsistent qop, nonce-count, and cnonce fields: `domain_error(http_digest_term(authorization),inconsistent(qop_nonce_count_cnonce))` `Authorization` contains an invalid algorithm: `domain_error(http_digest_algorithm,Algorithm)` `Authorization` contains an invalid qop value: `domain_error(http_digest_qop,Qop)` ------------------------------------------------------------------------ ###### `parse_authentication_info/2` Parses one `Authentication-Info` header field value into a normalized `digest_authentication_info/1` term. **Compilation flags:** `static` **Template:** `parse_authentication_info(Text,AuthenticationInfo)` **Mode and number of proofs:** `parse_authentication_info(++text,-compound)` - `one_or_error` **Exceptions:** `Text` is neither a variable nor text: `type_error(text,Text)` `Text` is not a valid Digest `Authentication-Info` header value: `domain_error(http_digest_header(authentication_info),invalid(syntax))` `Text` contains a duplicated Digest authentication-info directive: `domain_error(http_digest_header(authentication_info),duplicate(Name))` `Text` contains an unexpected Digest authentication-info directive: `domain_error(http_digest_header(authentication_info),unexpected(Name))` `Text` contains an invalid Digest authentication-info directive value: `domain_error(http_digest_header(authentication_info),invalid(Name))` ------------------------------------------------------------------------ ###### `generate_authentication_info/2` Generates one canonical `Authentication-Info` header field value from a normalized `digest_authentication_info/1` term. **Compilation flags:** `static` **Template:** `generate_authentication_info(AuthenticationInfo,HeaderValue)` **Mode and number of proofs:** `generate_authentication_info(+compound,-atom)` - `one_or_error` **Exceptions:** `AuthenticationInfo` is not a valid normalized Digest authentication-info term: `domain_error(http_digest_term(authentication_info),AuthenticationInfo)` `AuthenticationInfo` contains no field to generate: `domain_error(http_digest_term(authentication_info),missing(all))` `AuthenticationInfo` contains a duplicated field: `domain_error(http_digest_term(authentication_info),duplicate(Name))` `AuthenticationInfo` contains an unexpected field: `domain_error(http_digest_term(authentication_info),unexpected(Name))` `AuthenticationInfo` contains an invalid field: `domain_error(http_digest_term(authentication_info),invalid(Name))` `AuthenticationInfo` fields are not in canonical order: `domain_error(http_digest_term(authentication_info),invalid_order)` `AuthenticationInfo` contains inconsistent qop, nonce-count, and cnonce fields: `domain_error(http_digest_term(authentication_info),inconsistent(qop_nonce_count_cnonce))` ------------------------------------------------------------------------ ###### `authorize_request/6` Decorates a normalized HTTP request with a Digest `Authorization` header computed from a normalized challenge term, username, password, and options. **Compilation flags:** `static` **Template:** `authorize_request(Request,Challenge,Username,Password,AuthorizedRequest,Options)` **Mode and number of proofs:** `authorize_request(+compound,+compound,++text,++text,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Challenge` is not a valid normalized Digest challenge term: `domain_error(http_digest_term(challenge),Challenge)` `Username` or `Password` is neither a variable nor text: `type_error(text,Text)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid Digest authorization option: `domain_error(http_digest_authorize_request_option,Option)` `Challenge` contains an unsupported algorithm: `domain_error(http_digest_algorithm,Algorithm)` `Challenge` contains an unsupported qop value: `domain_error(http_digest_qop,Qop)` `Challenge` contains an unsupported charset: `domain_error(http_digest_charset,Charset)` The authorized request violates normalized HTTP request semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `protect_request/4` Verifies a normalized HTTP request using a Digest verifier object and returns either `continue(Request)` or `respond(Response)`. **Compilation flags:** `static` **Template:** `protect_request(Request,Verifier,Action,Options)` **Mode and number of proofs:** `protect_request(+compound,+object_identifier,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Verifier` is a variable: `instantiation_error` `Verifier` is neither a variable nor an existing object: `existence_error(http_digest_verifier,Verifier)` `Verifier` does not implement the Digest verifier protocol: `domain_error(http_digest_verifier,Verifier)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid Digest protection option: `domain_error(http_digest_protect_request_option,Option)` `Options` is missing a required Digest protection option: `domain_error(http_digest_protect_request_option,Option)` `Options` contains an invalid Digest status: `domain_error(http_digest_status,Status)` `Options` contains an invalid Digest algorithm: `domain_error(http_digest_algorithm,Algorithm)` `Options` contains an invalid Digest qop value: `domain_error(http_digest_qop,Qop)` `Options` contains an invalid Digest charset: `domain_error(http_digest_charset,Charset)` ------------------------------------------------------------------------ ###### `unauthorized_response/3` Builds a normalized `401`` ``Unauthorized` response and returns the generated normalized Digest challenge term. **Compilation flags:** `static` **Template:** `unauthorized_response(Challenge,Response,Options)` **Mode and number of proofs:** `unauthorized_response(-compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid Digest unauthorized-response option: `domain_error(http_digest_unauthorized_response_option,Option)` `Options` is missing a required Digest unauthorized-response option: `domain_error(http_digest_unauthorized_response_option,Option)` `Options` contains an invalid Digest status: `domain_error(http_digest_status,Status)` `Options` contains an invalid Digest algorithm: `domain_error(http_digest_algorithm,Algorithm)` `Options` contains an invalid Digest qop value: `domain_error(http_digest_qop,Qop)` `Options` contains an invalid Digest charset: `domain_error(http_digest_charset,Charset)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `unauthorized_response/4` Decorates a normalized HTTP response with an explicit normalized Digest challenge term and returns the resulting `401`` ``Unauthorized` response. **Compilation flags:** `static` **Template:** `unauthorized_response(Challenge,Response0,Response,Options)` **Mode and number of proofs:** `unauthorized_response(+compound,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Challenge` is not a valid normalized Digest challenge term: `domain_error(http_digest_term(challenge),Challenge)` `Response0` is not a valid normalized HTTP response term: `domain_error(http_response,Response0)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid Digest unauthorized-response option: `domain_error(http_digest_unauthorized_response_option,Option)` `Challenge` contains an invalid Digest charset: `domain_error(http_digest_charset,Charset)` `Options` contains an invalid Digest status: `domain_error(http_digest_status,Status)` The decorated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `add_authentication_info/4` Decorates a normalized HTTP response with an `Authentication-Info` header computed from a previously verified request and options. The `nextnonce` option accepts `false` to omit the field, `true` to generate a fresh nonce using `nonce_secret/1`, or an explicit nonce atom to emit verbatim. **Compilation flags:** `static` **Template:** `add_authentication_info(Request,Response0,Response,Options)` **Mode and number of proofs:** `add_authentication_info(+compound,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Request` is not annotated with a verified Digest property: `domain_error(http_digest_verified_request,missing(Property))` `Response0` is not a valid normalized HTTP response term: `domain_error(http_response,Response0)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid authentication-info option: `domain_error(http_digest_add_authentication_info_option,Option)` `Options` is missing a required authentication-info option: `domain_error(http_digest_add_authentication_info_option,Option)` The decorated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `http_digest_verifier_protocol` Protocol for HTTP Digest authentication verifiers backed by stored HA1 values. **Availability:** `logtalk_load(http_digest(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-29 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `ha1/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `ha1/4` Returns the stored lowercase hexadecimal HA1 value for the given normalized digest algorithm family, realm, and username. Fails when the user is unknown for the realm. **Compilation flags:** `static` **Template:** `ha1(Algorithm,Realm,Username,HA1)` **Mode and number of proofs:** `ha1(+atom,++atom,++atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `http_router_digest_auth(Verifier,ProtectOptions,AuthenticationInfoOptions)` - `Verifier` - Verifier object passed to `http_digest::protect_request/4` when a routed request declares `digest_auth/1` metadata. - `ProtectOptions` - Base protect-request options merged with any route-specific `digest_auth/1` metadata options. - `AuthenticationInfoOptions` - Base options passed to `http_digest::add_authentication_info/4` when a routed request was successfully verified using Digest authentication. Optional Digest-auth router helpers for objects importing the `http_router` category. **Availability:** `logtalk_load(http_digest(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-03 **Compilation flags:** `static` **Uses:** http_core http_digest list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `authorize_digest_auth_request/2` - `add_digest_authentication_info/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `authorize_digest_auth_request/2` Router helper that applies Digest-auth route metadata to a routed request and returns either `continue(Request)` or `respond(Response)`. **Compilation flags:** `static` **Template:** `authorize_digest_auth_request(Request,Action)` **Mode and number of proofs:** `authorize_digest_auth_request(+compound,-compound)` - `one_or_error` **Exceptions:** `RouteOptions` is not a proper list of Digest protection options: `domain_error(http_router_digest_auth_options,RouteOptions)` `ProtectOptions` is not a proper list of Digest protection options: `domain_error(http_router_digest_auth_options,ProtectOptions)` `Request` is not a normalized HTTP request term: `domain_error(http_request,Request)` `Verifier` is a variable: `instantiation_error` `Verifier` does not name an existing object: `existence_error(http_digest_verifier,Verifier)` `Verifier` names an object that does not implement `http_digest_verifier_protocol`: `domain_error(http_digest_verifier,Verifier)` An element `Option` of the effective Digest protection options list is a variable: `instantiation_error` An element `Option` of the effective Digest protection options list is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the effective Digest protection options list is a compound term but not a valid Digest option: `domain_error(option,Option)` An element `Option` of the effective Digest protection options list is not accepted by `http_digest::protect_request/4`: `domain_error(http_digest_protect_request_option,Option)` The effective Digest protection options omit `realm/1`: `domain_error(http_digest_term(challenge),missing(realm))` The effective Digest protection options omit `nonce_secret/1`: `domain_error(http_digest_protect_request_option,nonce_secret(A))` The effective Digest protection options request unsupported `userhash` support: `domain_error(http_digest_term(challenge),invalid(userhash))` The effective Digest protection options request an unsupported Digest algorithm: `domain_error(http_digest_algorithm,Algorithm)` The effective Digest protection options request an unsupported Digest qop: `domain_error(http_digest_qop,Qop)` The effective Digest protection options request a non-401 failure status: `domain_error(http_digest_status,Status)` ------------------------------------------------------------------------ ###### `add_digest_authentication_info/3` Router helper that decorates a response with `Authentication-Info` when the routed request was successfully verified using Digest authentication. **Compilation flags:** `static` **Template:** `add_digest_authentication_info(Request,Response0,Response)` **Mode and number of proofs:** `add_digest_authentication_info(+compound,+compound,-compound)` - `one_or_error` **Exceptions:** `AuthenticationInfoOptions` is not a proper list of Digest authentication-info options: `domain_error(http_router_digest_auth_authentication_info_options,AuthenticationInfoOptions)` `Request` is not a normalized HTTP request term: `domain_error(http_request,Request)` `Response0` is not a normalized HTTP response term: `domain_error(http_response,Response0)` An element `Option` of the Digest authentication-info options list is a variable: `instantiation_error` An element `Option` of the Digest authentication-info options list is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the Digest authentication-info options list is a compound term but not a valid Digest option: `domain_error(option,Option)` An element `Option` of the Digest authentication-info options list is not accepted by `http_digest::add_authentication_info/4`: `domain_error(http_digest_add_authentication_info_option,Option)` The routed request carries an invalid Digest authorization term: `domain_error(http_digest_term(authorization),Cause)` The routed request carries a Digest authorization with an unsupported response qop: `domain_error(http_digest_qop,Qop)` The routed request carries a Digest authorization with an unsupported algorithm: `domain_error(http_digest_algorithm,Algorithm)` Automatic `nextnonce` generation is requested without `nonce_secret/1`: `domain_error(http_digest_add_authentication_info_option,nonce_secret(A))` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_server_core_digest_handler(Verifier,Handler,ProtectOptions,AuthenticationInfoOptions)` - `Verifier` - Verifier object implementing the `http_digest_verifier_protocol` protocol. - `Handler` - Wrapped object implementing the `http_handler_protocol` protocol. - `ProtectOptions` - Options passed to `http_digest::protect_request/4`. - `AuthenticationInfoOptions` - Options passed to `http_digest::add_authentication_info/4` on successful request verification. Wrapper HTTP handler object that applies Digest request verification and Authentication-Info response decoration around another portable HTTP handler. **Availability:** `logtalk_load(http_digest(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_handler_protocol **Uses:** http_digest **Remarks:** (none) **Inherited public predicates:**  handle/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_directory_listing") **object** #### `http_directory_listing` Router-agnostic directory listing helper built on the normalized `http_core` library. **Availability:** `logtalk_load(http_directory_listing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_docroot_paths **Uses:** atom date html5 http_core list mime_types os term_io user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `serve/4` - `serve/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `serve/4` Serves a directory listing for a relative request path from the given document root using the default options and returns a normalized response. **Compilation flags:** `static` **Template:** `serve(Path,Request,DocumentRoot,Response)` **Mode and number of proofs:** `serve(+atom,+compound,+atom,-compound)` - `one_or_error` **Exceptions:** `Path` is not a safe document-root relative path: `domain_error(http_docroot_relative_path,Path)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `DocumentRoot` is not a valid absolute document root path: `domain_error(http_docroot_document_root,DocumentRoot)` `DocumentRoot` is not an existing directory-listing document root: `domain_error(http_directory_listing_document_root,DocumentRoot)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `serve/5` Serves a directory listing for a relative request path from the given document root using the given options and returns a normalized response. **Compilation flags:** `static` **Template:** `serve(Path,Request,DocumentRoot,Response,Options)` **Mode and number of proofs:** `serve(+atom,+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Path` is not a safe document-root relative path: `domain_error(http_docroot_relative_path,Path)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `DocumentRoot` is not a valid absolute document root path: `domain_error(http_docroot_document_root,DocumentRoot)` `DocumentRoot` is not an existing directory-listing document root: `domain_error(http_directory_listing_document_root,DocumentRoot)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_htmx") **object** #### `http_htmx` Transport-neutral HTMX request classification, HTML reply helpers, and response decoration helpers for normalized HTTP messages. **Availability:** `logtalk_load(http_htmx(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_json_term_helpers **Uses:** atom html5 http_core list term_io url(Representation) user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `is_htmx_request/1` - `is_boosted_request/1` - `is_history_restore_request/1` - `is_fragment_request/1` - `request_kind/2` - `current_url/2` - `current_url_abs_path/2` - `prompt/2` - `target/2` - `trigger/2` - `trigger_name/2` - `request_properties/2` - `request_property/2` - `reply/3` - `reply/4` - `page_fragment_reply/4` - `page_fragment_reply/5` - `add_response_headers/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `is_htmx_request/1` Succeeds when the request carries a truthy `HX-Request` header value. **Compilation flags:** `static` **Template:** `is_htmx_request(Request)` **Mode and number of proofs:** `is_htmx_request(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_boosted_request/1` Succeeds when the request carries a truthy `HX-Boosted` header value. **Compilation flags:** `static` **Template:** `is_boosted_request(Request)` **Mode and number of proofs:** `is_boosted_request(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_history_restore_request/1` Succeeds when the request carries a truthy `HX-History-Restore-Request` header value. **Compilation flags:** `static` **Template:** `is_history_restore_request(Request)` **Mode and number of proofs:** `is_history_restore_request(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_fragment_request/1` Succeeds when the request should receive fragment content, meaning an HTMX request that is neither boosted nor a history restore request. **Compilation flags:** `static` **Template:** `is_fragment_request(Request)` **Mode and number of proofs:** `is_fragment_request(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `request_kind/2` Classifies the request as one of `ordinary`, `fragment`, `boosted`, or `history_restore`. **Compilation flags:** `static` **Template:** `request_kind(Request,Kind)` **Mode and number of proofs:** `request_kind(+compound,-atom)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `current_url/2` Returns the single request `HX-Current-URL` header value when present. **Compilation flags:** `static` **Template:** `current_url(Request,URL)` **Mode and number of proofs:** `current_url(+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `current_url_abs_path/2` Returns the same-origin absolute-path form of the `HX-Current-URL` header value, including any query component but excluding scheme, authority, and fragment. **Compilation flags:** `static` **Template:** `current_url_abs_path(Request,AbsolutePath)` **Mode and number of proofs:** `current_url_abs_path(+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `prompt/2` Returns the single request `HX-Prompt` header value when present. **Compilation flags:** `static` **Template:** `prompt(Request,Prompt)` **Mode and number of proofs:** `prompt(+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `target/2` Returns the single request `HX-Target` header value when present. **Compilation flags:** `static` **Template:** `target(Request,Target)` **Mode and number of proofs:** `target(+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `trigger/2` Returns the single request `HX-Trigger` header value when present. **Compilation flags:** `static` **Template:** `trigger(Request,Trigger)` **Mode and number of proofs:** `trigger(+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `trigger_name/2` Returns the single request `HX-Trigger-Name` header value when present. **Compilation flags:** `static` **Template:** `trigger_name(Request,Name)` **Mode and number of proofs:** `trigger_name(+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `request_properties/2` Returns a list of derived HTMX request properties and request classification computed from the normalized request headers. **Compilation flags:** `static` **Template:** `request_properties(Request,Properties)` **Mode and number of proofs:** `request_properties(+compound,-list(compound))` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `request_property/2` Enumerates or tests individual derived HTMX request properties and request classification computed from the normalized request headers. **Compilation flags:** `static` **Template:** `request_property(Request,Property)` **Mode and number of proofs:** `request_property(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `reply/3` Builds a normalized `text/html` response from a pre-rendered HTML atom or an `html` term/list using the default options. **Compilation flags:** `static` **Template:** `reply(Request,Content,Response)` **Mode and number of proofs:** `reply(+compound,+term,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Content` cannot be rendered as HTMX HTML content: `domain_error(http_htmx_content,Content)` The HTMX response status is invalid: `domain_error(htmx_response_headers_status,Status)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `reply/4` Builds a normalized `text/html` response from a pre-rendered HTML atom or an `html` term/list using the given options. **Compilation flags:** `static` **Template:** `reply(Request,Content,Response,Options)` **Mode and number of proofs:** `reply(+compound,+term,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Content` cannot be rendered as HTMX HTML content: `domain_error(http_htmx_content,Content)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The HTMX response status is invalid: `domain_error(htmx_response_headers_status,Status)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `page_fragment_reply/4` Builds a normalized `text/html` response using the fragment content when `is_fragment_request/1` succeeds and the full-page content otherwise, with the default options. **Compilation flags:** `static` **Template:** `page_fragment_reply(Request,PageContent,FragmentContent,Response)` **Mode and number of proofs:** `page_fragment_reply(+compound,+term,+term,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `PageContent` or `FragmentContent` cannot be rendered as HTMX HTML content: `domain_error(http_htmx_content,Content)` The HTMX response status is invalid: `domain_error(htmx_response_headers_status,Status)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `page_fragment_reply/5` Builds a normalized `text/html` response using the fragment content when `is_fragment_request/1` succeeds and the full-page content otherwise, with the given options. **Compilation flags:** `static` **Template:** `page_fragment_reply(Request,PageContent,FragmentContent,Response,Options)` **Mode and number of proofs:** `page_fragment_reply(+compound,+term,+term,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `PageContent` or `FragmentContent` cannot be rendered as HTMX HTML content: `domain_error(http_htmx_content,Content)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The HTMX response status is invalid: `domain_error(htmx_response_headers_status,Status)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `add_response_headers/4` Decorates a normalized response with the relevant HTMX response headers and optional cache-vary metadata. **Compilation flags:** `static` **Template:** `add_response_headers(Request,Response0,Response,Options)` **Mode and number of proofs:** `add_response_headers(+compound,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Response0` is not a valid normalized HTTP response term: `domain_error(http_response,Response0)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The HTMX response status is invalid: `domain_error(htmx_response_headers_status,Status)` The decorated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `http_router_htmx` Optional HTMX middleware helpers for router objects importing the `http_router` category. **Availability:** `logtalk_load(http_htmx(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static` **Uses:** http_core http_htmx list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `annotate_htmx_request/2` - `add_htmx_response_headers/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `annotate_htmx_request/2` Router middleware helper that annotates a normalized request with derived HTMX properties and continues the middleware chain. **Compilation flags:** `static` **Template:** `annotate_htmx_request(Request,Action)` **Mode and number of proofs:** `annotate_htmx_request(+compound,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The annotated request violates normalized HTTP request semantics: `domain_error(http_header_semantics,Header)` The annotated request properties violate normalized HTTP request semantics: `domain_error(http_property_semantics,Property)` ------------------------------------------------------------------------ ###### `add_htmx_response_headers/3` Router response-middleware helper that decorates a normalized response using `htmx_response_options/1` request or response properties. **Compilation flags:** `static` **Template:** `add_htmx_response_headers(Request,Response0,Response)` **Mode and number of proofs:** `add_htmx_response_headers(+compound,+compound,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Response0` is not a valid normalized HTTP response term: `domain_error(http_response,Response0)` The derived HTMX response options are invalid: `domain_error(option,Option)` The decorated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_multipart") **object** #### `http_multipart` Multipart helper predicates built on top of the normalized body and part terms provided by the http library. **Availability:** `logtalk_load(http_multipart(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` http_text_helpers **Uses:** http_core list type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `body/3` - `is_body/1` - `parse/4` - `generate/3` - `media_type/2` - `parts/2` - `fields/2` - `files/2` - `part/4` - `is_part/1` - `part_headers/2` - `part_body/2` - `part_properties/2` - `field/4` - `file/6` - `field_part/4` - `file_part/6` - `form_data_body/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `body/3` Constructs a validated normalized multipart body term from a multipart media type atom and a list of multipart parts. **Compilation flags:** `static` **Template:** `body(MediaType,Parts,Body)` **Mode and number of proofs:** `body(+atom,+list(compound),-compound)` - `one_or_error` **Exceptions:** `MediaType` is not a valid multipart media type atom: `domain_error(http_multipart_media_type,MediaType)` `Parts` is not a valid list of normalized multipart parts: `domain_error(http_multipart_parts,Parts)` ------------------------------------------------------------------------ ###### `is_body/1` True when the argument is a valid normalized multipart body term. **Compilation flags:** `static` **Template:** `is_body(Body)` **Mode and number of proofs:** `is_body(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse/4` Parses a multipart body from a source term by delegating to the underlying `http_core::parse_body/4` predicate after validating the media type. **Compilation flags:** `static` **Template:** `parse(Source,MediaType,Options,Body)` **Mode and number of proofs:** `parse(++compound,+atom,+list,-compound)` - `one_or_error` **Exceptions:** `MediaType` is not a valid multipart media type atom: `domain_error(http_multipart_media_type,MediaType)` `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid HTTP source term: `domain_error(http_source,Source)` `Options` is not a valid HTTP body options list: `domain_error(http_body_options,Options)` No registered HTTP body codec exists for `MediaType` when codec-based decoding is required: `existence_error(http_body_codec,MediaType)` The parsed body is not a valid normalized multipart body term: `domain_error(http_multipart_body,Body)` ------------------------------------------------------------------------ ###### `generate/3` Generates a multipart body to a sink term by delegating to the underlying `http_core::generate_body/3` predicate after validating the multipart body term. **Compilation flags:** `static` **Template:** `generate(Sink,Body,Options)` **Mode and number of proofs:** `generate(++compound,+compound,+list)` - `one_or_error` **Exceptions:** `Body` is not a valid normalized multipart body term: `domain_error(http_multipart_body,Body)` `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid HTTP sink term: `domain_error(http_sink,Sink)` `Options` is not a valid HTTP body options list: `domain_error(http_body_options,Options)` No registered HTTP body codec exists for the body media type when codec-based encoding is required: `existence_error(http_body_codec,MediaType)` ------------------------------------------------------------------------ ###### `media_type/2` Returns the media type atom of a validated multipart body term. **Compilation flags:** `static` **Template:** `media_type(Body,MediaType)` **Mode and number of proofs:** `media_type(+compound,-atom)` - `one_or_error` **Exceptions:** `Body` is not a valid normalized multipart body term: `domain_error(http_multipart_body,Body)` ------------------------------------------------------------------------ ###### `parts/2` Returns the list of multipart part terms of a validated multipart body term. **Compilation flags:** `static` **Template:** `parts(Body,Parts)` **Mode and number of proofs:** `parts(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Body` is not a valid normalized multipart body term: `domain_error(http_multipart_body,Body)` ------------------------------------------------------------------------ ###### `fields/2` Returns the list of form-data field(Name, Value, Parameters) descriptors found in a validated multipart/form-data body, preserving part order. **Compilation flags:** `static` **Template:** `fields(Body,Fields)` **Mode and number of proofs:** `fields(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Body` is not a valid normalized multipart/form-data body term: `domain_error(http_multipart_form_data_body,Body)` ------------------------------------------------------------------------ ###### `files/2` Returns the list of form-data `file(Name,`` ``Filename,`` ``MediaType,`` ``Payload,`` ``Parameters)` descriptors found in a validated multipart/form-data body, preserving part order. **Compilation flags:** `static` **Template:** `files(Body,Files)` **Mode and number of proofs:** `files(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Body` is not a valid normalized multipart/form-data body term: `domain_error(http_multipart_form_data_body,Body)` ------------------------------------------------------------------------ ###### `part/4` Constructs a validated normalized multipart part term from headers, body, and properties. **Compilation flags:** `static` **Template:** `part(Headers,Body,Properties,Part)` **Mode and number of proofs:** `part(+list(compound),+compound,+list(compound),-compound)` - `one_or_error` **Exceptions:** The given headers, body, and properties do not form a valid normalized multipart part term: `domain_error(http_multipart_part,Part)` ------------------------------------------------------------------------ ###### `is_part/1` True when the argument is a valid normalized multipart part term. **Compilation flags:** `static` **Template:** `is_part(Part)` **Mode and number of proofs:** `is_part(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `part_headers/2` Returns the headers of a validated multipart part term. **Compilation flags:** `static` **Template:** `part_headers(Part,Headers)` **Mode and number of proofs:** `part_headers(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Part` is not a valid normalized multipart part term: `domain_error(http_multipart_part,Part)` ------------------------------------------------------------------------ ###### `part_body/2` Returns the body of a validated multipart part term. **Compilation flags:** `static` **Template:** `part_body(Part,Body)` **Mode and number of proofs:** `part_body(+compound,-compound)` - `one_or_error` **Exceptions:** `Part` is not a valid normalized multipart part term: `domain_error(http_multipart_part,Part)` ------------------------------------------------------------------------ ###### `part_properties/2` Returns the properties of a validated multipart part term. **Compilation flags:** `static` **Template:** `part_properties(Part,Properties)` **Mode and number of proofs:** `part_properties(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Part` is not a valid normalized multipart part term: `domain_error(http_multipart_part,Part)` ------------------------------------------------------------------------ ###### `field/4` True when the validated multipart part is a textual form-data field part, returning its field name, text value, and additional disposition parameters. **Compilation flags:** `static` **Template:** `field(Part,Name,Value,Parameters)` **Mode and number of proofs:** `field(+compound,-atom,-term,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `file/6` True when the validated multipart part is a form-data file part, returning its field name, filename, media type, payload term, and additional disposition parameters. **Compilation flags:** `static` **Template:** `file(Part,Name,Filename,MediaType,Payload,Parameters)` **Mode and number of proofs:** `file(+compound,-atom,-atom,-atom,-compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `field_part/4` Constructs a normalized multipart part for a textual form-data field using a content-disposition header, a text/plain body, and additional disposition parameters. **Compilation flags:** `static` **Template:** `field_part(Name,Value,Parameters,Part)` **Mode and number of proofs:** `field_part(+atom,+term,+list(compound),-compound)` - `one_or_error` **Exceptions:** `Name` is not a valid form-data field name: `domain_error(http_multipart_form_data_parameter_name,Name)` `Parameters` is not a valid list of additional form-data disposition parameters: `domain_error(http_multipart_form_data_parameters,Parameters)` A form-data disposition parameter is invalid for a textual field part: `domain_error(http_multipart_form_data_parameter,Parameter)` ------------------------------------------------------------------------ ###### `file_part/6` Constructs a normalized multipart part for a form-data file using a content-disposition header, the given media type and payload, and additional disposition parameters. **Compilation flags:** `static` **Template:** `file_part(Name,Filename,MediaType,Payload,Parameters,Part)` **Mode and number of proofs:** `file_part(+atom,+atom,+atom,+compound,+list(compound),-compound)` - `one_or_error` **Exceptions:** `Name` is not a valid form-data field name: `domain_error(http_multipart_form_data_parameter_name,Name)` `Filename` is not a valid form-data filename value: `domain_error(http_multipart_form_data_parameter_value,Filename)` `Parameters` is not a valid list of additional form-data disposition parameters: `domain_error(http_multipart_form_data_parameters,Parameters)` A form-data disposition parameter is invalid for a file part: `domain_error(http_multipart_form_data_parameter,Parameter)` ------------------------------------------------------------------------ ###### `form_data_body/2` Constructs a multipart/form-data body from an ordered list of `field(Name,`` ``Value,`` ``Parameters)` and `file(Name,`` ``Filename,`` ``MediaType,`` ``Payload,`` ``Parameters)` descriptors. **Compilation flags:** `static` **Template:** `form_data_body(Items,Body)` **Mode and number of proofs:** `form_data_body(+list(compound),-compound)` - `one_or_error` **Exceptions:** `Items` is not a valid list of form-data field or file descriptors: `domain_error(http_multipart_form_data_items,Items)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_parameters") **object** #### `http_parameters` Typed HTTP query, form, path, header, and cookie parameter extraction helpers plus OpenAPI descriptor generation helpers. **Availability:** `logtalk_load(http_parameters(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-14 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` http_json_term_helpers **Uses:** http_core list type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parameters/3` - `parameter/3` - `open_api_parameters/2` - `open_api_request_body/3` - `open_api_bad_request_response/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parameters/3` Extracts typed parameters from a normalized HTTP request using the given declaration list. Client-input failures throw `error(http_parameter_validation(Errors),`` ``Context)` where `Errors` is a non-empty list of structured parameter errors. **Compilation flags:** `static` **Template:** `parameters(Request,Declarations,Parameters)` **Mode and number of proofs:** `parameters(+compound,+list(compound),-list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Declarations` is a variable or a partial list: `instantiation_error` `Declarations` is neither a variable nor a list: `type_error(list,Declarations)` An element `Declaration` of the list `Declarations` is not a valid HTTP parameter declaration: `domain_error(http_parameter_declaration,Declaration)` An element `Declaration` of the list `Declarations` has an invalid parameter name: `domain_error(http_parameter_name,Name)` An element `Declaration` of the list `Declarations` has an invalid parameter source: `domain_error(http_parameter_source,Source)` An element `Declaration` of the list `Declarations` has an invalid parameter type: `domain_error(http_parameter_type,Type)` An element `Declaration` of the list `Declarations` has duplicated declaration options: `domain_error(http_parameter_options,duplicate(Option))` An element `Declaration` of the list `Declarations` has an invalid declaration option: `domain_error(http_parameter_option,Option)` An element `Declaration` of the list `Declarations` has an invalid description: `domain_error(http_parameter_description,Description)` An element `Declaration` of the list `Declarations` has an invalid default value: `domain_error(http_parameter_default(Type),invalid_default(Name,Value))` `Declarations` contains duplicated declarations for a parameter source: `domain_error(http_parameter_declaration(Name,Source),duplicate)` The request parameters fail declared type or constraint validation: `error(http_parameter_validation(Errors),Context)` ------------------------------------------------------------------------ ###### `parameter/3` Extracts a single typed parameter from a normalized HTTP request using the given declaration. Optional absent parameters fail instead of throwing an error. **Compilation flags:** `static` **Template:** `parameter(Request,Declaration,Value)` **Mode and number of proofs:** `parameter(+compound,+compound,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `open_api_parameters/2` Generates OpenAPI `parameter/5` descriptors for query, path, header, and cookie declarations. **Compilation flags:** `static` **Template:** `open_api_parameters(Declarations,Parameters)` **Mode and number of proofs:** `open_api_parameters(+list(compound),-list(compound))` - `one_or_error` **Exceptions:** `Declarations` is a variable or a partial list: `instantiation_error` `Declarations` is neither a variable nor a list: `type_error(list,Declarations)` An element `Declaration` of the list `Declarations` is not a valid HTTP parameter declaration: `domain_error(http_parameter_declaration,Declaration)` An element `Declaration` of the list `Declarations` has an invalid parameter name: `domain_error(http_parameter_name,Name)` An element `Declaration` of the list `Declarations` has an invalid parameter source: `domain_error(http_parameter_source,Source)` An element `Declaration` of the list `Declarations` has an invalid parameter type: `domain_error(http_parameter_type,Type)` An element `Declaration` of the list `Declarations` has an invalid declaration option: `domain_error(http_parameter_option,Option)` An element `Declaration` of the list `Declarations` has duplicated declaration options: `domain_error(http_parameter_options,duplicate(Option))` `Declarations` contains duplicated declarations for a parameter source: `domain_error(http_parameter_declaration(Name,Source),duplicate)` ------------------------------------------------------------------------ ###### `open_api_request_body/3` Generates an OpenAPI `request_body/3` descriptor for form declarations using the given description. Fails when the declaration list contains no form parameters. **Compilation flags:** `static` **Template:** `open_api_request_body(Declarations,Description,RequestBody)` **Mode and number of proofs:** `open_api_request_body(+list(compound),+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `open_api_bad_request_response/1` Returns the default OpenAPI `400`` ``Bad`` ``Request` response descriptor used by router integrations. **Compilation flags:** `static` **Template:** `open_api_bad_request_response(Response)` **Mode and number of proofs:** `open_api_bad_request_response(-compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `http_router_parameters` Declarative router companion category that reuses `http_parameters` declarations for request extraction and OpenAPI metadata generation. **Availability:** `logtalk_load(http_parameters(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static` **Extends:** `public` http_router **Uses:** http_core http_parameters list **Remarks:** > - Route declarations: Importing objects define parameter declarations per route using `route_parameter_declarations/2`. > > - Handler helper: Route handlers can call `route_parameters/2` on the routed request to extract typed values using the matched route declarations. > > - OpenAPI metadata: The category generates route metadata for query and path parameters, form request bodies, and a default `400`` ``Bad`` ``Request` response descriptor from the same declarations. Importing objects can extend or override that metadata using `route_parameter_extra_metadata/2` or by overriding `route_metadata/2` and delegating with `^^route_metadata/2`. **Inherited public predicates:**  api_info/1  handle/2  operations/1  schema/2  security/1  security_scheme/2  servers/1 - Public predicates - `route_parameters/2` - Protected predicates - `route_parameter_declarations/2` - `route_parameter_request_body_description/2` - `route_parameter_extra_metadata/2` - Private predicates - Operators ##### Public predicates ###### `route_parameters/2` Extracts typed parameters for the route identified by the routed request `route/1` annotation. **Compilation flags:** `static` **Template:** `route_parameters(Request,Parameters)` **Mode and number of proofs:** `route_parameters(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `Request` does not contain a route annotation: `domain_error(http_routed_request,Request)` The route parameter declarations are invalid: `domain_error(http_parameter_declaration,Declaration)` A path parameter declaration is not declared by the route path template: `domain_error(http_parameter_declaration(Name,path),not_in_route_path(RouteId))` A path parameter declaration type is incompatible with the route path template: `domain_error(http_parameter_declaration(Name,path),incompatible_route_path_type(Type,PathTemplateType))` The request parameters fail declared type or constraint validation: `error(http_parameter_validation(Errors),Context)` ------------------------------------------------------------------------ ##### Protected predicates ###### `route_parameter_declarations/2` Optional hook predicate that returns the `http_parameters` declaration list for a route identifier. **Compilation flags:** `static` **Template:** `route_parameter_declarations(RouteId,Declarations)` **Mode and number of proofs:** `route_parameter_declarations(?atom,?list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_parameter_request_body_description/2` Optional hook predicate that customizes the generated OpenAPI request-body description for form parameter declarations. **Compilation flags:** `static` **Template:** `route_parameter_request_body_description(RouteId,Description)` **Mode and number of proofs:** `route_parameter_request_body_description(?atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_parameter_extra_metadata/2` Optional hook predicate that returns additional route metadata terms to merge with the metadata generated from parameter declarations. **Compilation flags:** `static` **Template:** `route_parameter_extra_metadata(RouteId,Metadata)` **Mode and number of proofs:** `route_parameter_extra_metadata(?atom,?list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_process_transport") **object** #### `http_process_transport` Process-backed HTTP transport predicates using the process library and helper processes. **Availability:** `logtalk_load(http_process_transport(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-17 **Compilation flags:** `static,`` ``context_switching_calls,`` ``threaded` **Implements:** `public` http_transport_protocol **Imports:** `public` options `public` http_message_helpers `public` http_text_helpers **Uses:** http_client_core http_core http_server_core list logtalk os process reader socket user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  close_connection/1  close_connection_pool/1  close_listener/1  connection_pool_stats/2  connection_streams/3  default_option/1  default_options/1  exchange/3  exchange/4  exchange/5  exchange_sequence/3  exchange_sequence/4  open_connection/4  open_connection_pool/4  open_listener/4  option/2  option/3  request_listener_shutdown/1  request_shutdown/1  serve_listener/4  serve_listener/5  serve_once/3  serve_until_shutdown/4  serve_until_shutdown/5  serve_websocket_once/5  supported_request_scheme/1  supported_websocket_scheme/1  valid_option/1  valid_options/1 - Public predicates - `temporary_tls_credentials/3` - `temporary_tls_credentials_files/3` - Protected predicates - Private predicates - `process_connection_state_/3` - `connection_pool_seed_/1` - `connection_pool_config_/6` - `connection_pool_available_/2` - `connection_pool_in_use_/2` - `listener_seed_/1` - `process_listener_state_/5` - `listener_temporary_tls_credentials_/3` - `listener_handle_alias_/2` - `listener_event_/2` - `process_listener_shutdown_requested_/1` - `listener_shutdown_seed_/1` - `listener_shutdown_control_/3` - `listener_shutdown_requested_/2` - `listener_active_worker_/3` - Operators ##### Public predicates ###### `temporary_tls_credentials/3` Creates or reuses temporary TLS certificate and key files under the system temporary directory using the given file name prefix. **Compilation flags:** `static` **Template:** `temporary_tls_credentials(Prefix,CertificateFile,KeyFile)` **Mode and number of proofs:** `temporary_tls_credentials(+atom,-atom,-atom)` - `one_or_error` **Exceptions:** `Prefix` is a variable: `instantiation_error` `Prefix` is not an atom: `type_error(atom,Prefix)` Temporary TLS credentials cannot be created: `resource_error(http_process_transport_temporary_tls_credentials)` ------------------------------------------------------------------------ ###### `temporary_tls_credentials_files/3` Computes the temporary TLS certificate and key file paths used for a given file name prefix without creating the files. **Compilation flags:** `static` **Template:** `temporary_tls_credentials_files(Prefix,CertificateFile,KeyFile)` **Mode and number of proofs:** `temporary_tls_credentials_files(+atom,-atom,-atom)` - `one_or_error` **Exceptions:** `Prefix` is a variable: `instantiation_error` `Prefix` is not an atom: `type_error(atom,Prefix)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `process_connection_state_/3` Registered helper-process state for open reusable client connections. **Compilation flags:** `dynamic` **Template:** `process_connection_state_(Connection,Process,Error)` **Mode and number of proofs:** `process_connection_state_(?compound,?ground,?stream)` - `zero_or_more` ------------------------------------------------------------------------ ###### `connection_pool_seed_/1` Last allocated connection pool identifier. **Compilation flags:** `dynamic` **Template:** `connection_pool_seed_(PoolId)` **Mode and number of proofs:** `connection_pool_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `connection_pool_config_/6` Stored connection pool configuration indexed by pool identifier. **Compilation flags:** `dynamic` **Template:** `connection_pool_config_(PoolId,Host,Port,MinSize,MaxSize,ConnectionOptions)` **Mode and number of proofs:** `connection_pool_config_(?positive_integer,?atom,?integer,?non_negative_integer,?positive_integer,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `connection_pool_available_/2` Reusable idle client connections indexed by pool identifier. **Compilation flags:** `dynamic` **Template:** `connection_pool_available_(PoolId,Connection)` **Mode and number of proofs:** `connection_pool_available_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `connection_pool_in_use_/2` Checked-out client connections indexed by pool identifier. **Compilation flags:** `dynamic` **Template:** `connection_pool_in_use_(PoolId,Connection)` **Mode and number of proofs:** `connection_pool_in_use_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `listener_seed_/1` Last allocated listener identifier. **Compilation flags:** `dynamic` **Template:** `listener_seed_(ListenerId)` **Mode and number of proofs:** `listener_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `process_listener_state_/5` Registered process state for open listeners. **Compilation flags:** `dynamic` **Template:** `process_listener_state_(ListenerId,Executable,Process,RelayListener,Error)` **Mode and number of proofs:** `process_listener_state_(?positive_integer,?atom,?ground,?compound,?stream)` - `zero_or_more` ------------------------------------------------------------------------ ###### `listener_temporary_tls_credentials_/3` Tracked temporary TLS credential files owned by open listeners. **Compilation flags:** `dynamic` **Template:** `listener_temporary_tls_credentials_(ListenerId,CertificateFile,KeyFile)` **Mode and number of proofs:** `listener_temporary_tls_credentials_(?positive_integer,?atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `listener_handle_alias_/2` Maps public listener handles to registered process listener identifiers. **Compilation flags:** `dynamic` **Template:** `listener_handle_alias_(Listener,ListenerId)` **Mode and number of proofs:** `listener_handle_alias_(?term,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `listener_event_/2` Queued listener events parsed from the listener helper diagnostics stream. **Compilation flags:** `dynamic` **Template:** `listener_event_(ListenerId,Event)` **Mode and number of proofs:** `listener_event_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `process_listener_shutdown_requested_/1` Flag recording that a synthetic listener shutdown wakeup is pending. **Compilation flags:** `dynamic` **Template:** `process_listener_shutdown_requested_(ListenerId)` **Mode and number of proofs:** `process_listener_shutdown_requested_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `listener_shutdown_seed_/1` Last allocated shutdown-run identifier. **Compilation flags:** `dynamic` **Template:** `listener_shutdown_seed_(RunId)` **Mode and number of proofs:** `listener_shutdown_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `listener_shutdown_control_/3` Maps public shutdown control terms to listeners and active serving runs. **Compilation flags:** `dynamic` **Template:** `listener_shutdown_control_(Control,Listener,RunId)` **Mode and number of proofs:** `listener_shutdown_control_(?nonvar,?compound,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `listener_shutdown_requested_/2` Recorded shutdown requests for serve_until_shutdown/4 runs. **Compilation flags:** `dynamic` **Template:** `listener_shutdown_requested_(Control,RunId)` **Mode and number of proofs:** `listener_shutdown_requested_(?nonvar,?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `listener_active_worker_/3` Tracked active connection workers for a serve_until_shutdown/4 run. **Compilation flags:** `dynamic` **Template:** `listener_active_worker_(Control,RunId,Worker)` **Mode and number of proofs:** `listener_active_worker_(?nonvar,?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### http_router") **category** #### `http_router` Declarative HTTP router category for objects implementing the http_handler_protocol protocol. **Availability:** `logtalk_load(http_router(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-17 **Compilation flags:** `static` **Extends:** `public` http_json_term_helpers `public` http_text_helpers **Uses:** http_core list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `handle/2` - `api_info/1` - `servers/1` - `security/1` - `operations/1` - `schema/2` - `security_scheme/2` - Protected predicates - `middleware/2` - `response_middleware/2` - `route/4` - `route_metadata/2` - `authorize_routed_request/2` - `route_open_api_request_body_example/2` - `route_open_api_response_example/2` - `open_api_info/1` - `open_api_servers/1` - `open_api_security/1` - `open_api_schema/2` - `open_api_security_scheme/2` - `route_produces/2` - `path_template_parameters/2` - `route_not_found_response/2` - `route_bad_request_response/3` - `route_method_not_allowed_response/3` - `route_automatic_options_response/3` - `route_not_acceptable_response/3` - Private predicates - Operators ##### Public predicates ###### `handle/2` Routes a normalized HTTP request using the importing object `route/4` clauses. **Compilation flags:** `static` **Template:** `handle(Request,Response)` **Mode and number of proofs:** `handle(+compound,-compound)` - `one_or_error` **Exceptions:** A middleware handler is not valid: `domain_error(http_router_middleware,Handler)` A middleware action is not valid: `domain_error(http_router_middleware_action,Action)` A response middleware handler is not valid: `domain_error(http_router_response_middleware,Handler)` A response middleware result is not a valid normalized HTTP response term: `domain_error(http_router_response_middleware_response,Response)` A route authorization action is not valid: `domain_error(http_router_route_authorization_action,Action)` A route `produces` declaration is not a non-empty list of media types: `domain_error(http_router_route_produces,ProducedMediaTypes)` A route `produces` media type is invalid: `domain_error(http_router_route_media_type,ProducedMediaType)` Route metadata is not a proper list: `domain_error(http_router_route_metadata,Metadata)` A route metadata property is invalid: `domain_error(http_router_route_metadata_property,MetadataProperty)` A route handler is not valid: `domain_error(http_router_handler,Handler)` A route path template is invalid: `domain_error(http_router_path_template,Template)` A route path template segment is invalid: `domain_error(http_router_path_template_segment,Segment)` A request path is invalid: `domain_error(http_router_path,Path)` The route handler reports parameter validation errors: `error(http_parameter_validation(Errors),Context)` ------------------------------------------------------------------------ ###### `api_info/1` Returns the top-level OpenAPI info descriptor used when a router object also implements the `open_api_provider_protocol` protocol. Importing objects can override the default descriptor by defining `open_api_info/1`. **Compilation flags:** `static` **Template:** `api_info(Info)` **Mode and number of proofs:** `api_info(-compound)` - `one` ------------------------------------------------------------------------ ###### `servers/1` Returns the OpenAPI server descriptors used when a router object also implements the `open_api_provider_protocol` protocol. Importing objects can override the default empty list by defining `open_api_servers/1`. **Compilation flags:** `static` **Template:** `servers(Servers)` **Mode and number of proofs:** `servers(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `security/1` Optional OpenAPI top-level security hook passthrough used when a router object also implements the `open_api_provider_protocol` protocol. Importing objects can define `open_api_security/1` to expose top-level security requirements. **Compilation flags:** `static` **Template:** `security(Security)` **Mode and number of proofs:** `security(-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `operations/1` Derives OpenAPI operation descriptors from `route/4`, `route_metadata/2`, and `route_produces/2` when a router object also implements the `open_api_provider_protocol` protocol. Recognized route metadata terms are `summary/1`, `description/1`, `tags/1`, `deprecated/1`, `security/1`, `parameters/1`, `request_body/1`, and `responses/1`. When `request_body/1` or `responses/1` metadata is absent, the router first checks optional `route_open_api_request_body_example/2` and `route_open_api_response_example/2` hooks and then attempts to infer inline request and response schemas by probing the route handler with a synthetic annotated request. Explicit metadata always takes precedence over inferred descriptors. **Compilation flags:** `static` **Template:** `operations(Operations)` **Mode and number of proofs:** `operations(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `schema/2` Optional OpenAPI schema hook passthrough used when a router object also implements the `open_api_provider_protocol` protocol. Importing objects can define `open_api_schema/2` to expose reusable schemas referenced by derived route operations. **Compilation flags:** `static` **Template:** `schema(Name,Schema)` **Mode and number of proofs:** `schema(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `security_scheme/2` Optional OpenAPI security scheme hook passthrough used when a router object also implements the `open_api_provider_protocol` protocol. Importing objects can define `open_api_security_scheme/2` to expose reusable security schemes referenced by derived route operations. **Compilation flags:** `static` **Template:** `security_scheme(Name,SecurityScheme)` **Mode and number of proofs:** `security_scheme(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates ###### `middleware/2` Optional hook predicate that enumerates ordered middleware descriptors. `Id` is the middleware identifier and `Handler` is the name of a declared local predicate with arity 2, typically protected, that receives the current request and returns either `continue(Request)` or `respond(Response)`. **Compilation flags:** `static` **Template:** `middleware(Id,Handler)` **Mode and number of proofs:** `middleware(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `response_middleware/2` Optional hook predicate that enumerates ordered response middleware descriptors. `Id` is the middleware identifier and `Handler` is the name of a declared local predicate with arity 3, typically protected, that receives the request used to produce the current response and returns the transformed response. Routed requests preserve their route metadata annotations and negotiated media type, when applicable. **Compilation flags:** `static` **Template:** `response_middleware(Id,Handler)` **Mode and number of proofs:** `response_middleware(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `route/4` Hook predicate that enumerates route descriptors. `Id` is the route identifier, `Method` is a lowercase HTTP method atom, `PathTemplate` is a path-template atom using literal segments, anonymous `*` wildcard segments, and optional plain or typed placeholders such as `{id}`, `{id:integer}`, and `{score:number}`, and `Handler` is the name of a declared local predicate with arity 2, typically protected, that receives the annotated request and returns the response. **Compilation flags:** `static` **Template:** `route(Id,Method,PathTemplate,Handler)` **Mode and number of proofs:** `route(?atom,?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `route_metadata/2` Optional hook predicate that declares additional metadata properties for a route. When defined, `Metadata` must be a list of compound terms. The router removes any existing request properties with the same functors, prepends the metadata to the matched request, and then adds the standard `route/1` and `path_params/1` annotations. **Compilation flags:** `static` **Template:** `route_metadata(Id,Metadata)` **Mode and number of proofs:** `route_metadata(?atom,?list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `authorize_routed_request/2` Optional hook predicate that validates or decorates a routed request after route matching and metadata annotation but before route handler dispatch. It must return either `continue(Request)` or `respond(Response)`. The default implementation continues with the routed request unchanged. **Compilation flags:** `static` **Template:** `authorize_routed_request(Request,Action)` **Mode and number of proofs:** `authorize_routed_request(+compound,-compound)` - `one_or_error` **Exceptions:** `Action` is not a valid route authorization action: `domain_error(http_router_route_authorization_action,Action)` ------------------------------------------------------------------------ ###### `route_open_api_request_body_example/2` Optional hook predicate that enumerates example request bodies for OpenAPI inference. Each `Body` must be either `empty` or a normalized `content(MediaType,`` ``Payload)` term. These examples are only consulted when explicit `request_body/1` route metadata is absent. **Compilation flags:** `static` **Template:** `route_open_api_request_body_example(Id,Body)` **Mode and number of proofs:** `route_open_api_request_body_example(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `route_open_api_response_example/2` Optional hook predicate that enumerates example normalized HTTP responses for OpenAPI inference. These examples are only consulted when explicit `responses/1` route metadata is absent. **Compilation flags:** `static` **Template:** `route_open_api_response_example(Id,Response)` **Mode and number of proofs:** `route_open_api_response_example(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `open_api_info/1` Hook predicate that importing router objects can override to customize the default top-level OpenAPI info descriptor. **Compilation flags:** `static` **Template:** `open_api_info(Info)` **Mode and number of proofs:** `open_api_info(-compound)` - `one` ------------------------------------------------------------------------ ###### `open_api_servers/1` Hook predicate that importing router objects can override to customize the default OpenAPI server descriptors. **Compilation flags:** `static` **Template:** `open_api_servers(Servers)` **Mode and number of proofs:** `open_api_servers(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `open_api_security/1` Optional hook predicate that importing router objects can define to expose top-level OpenAPI security requirements. **Compilation flags:** `static` **Template:** `open_api_security(Security)` **Mode and number of proofs:** `open_api_security(-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `open_api_schema/2` Optional hook predicate that importing router objects can define to expose reusable OpenAPI schemas. **Compilation flags:** `static` **Template:** `open_api_schema(Name,Schema)` **Mode and number of proofs:** `open_api_schema(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `open_api_security_scheme/2` Optional hook predicate that importing router objects can define to expose reusable OpenAPI security schemes. **Compilation flags:** `static` **Template:** `open_api_security_scheme(Name,SecurityScheme)` **Mode and number of proofs:** `open_api_security_scheme(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `route_produces/2` Optional hook predicate that declares the response media types produced by a route. When defined, `MediaTypes` must be a non-empty list of media type atoms. The router negotiates the request `Accept` header against this list, annotates successful matches with `response_media_type(MediaType)`, and returns `406`` ``Not`` ``Acceptable` when no produced type matches. **Compilation flags:** `static` **Template:** `route_produces(Id,MediaTypes)` **Mode and number of proofs:** `route_produces(?atom,?list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `path_template_parameters/2` Returns the normalized placeholder descriptors declared in a path template as `parameter(Name,`` ``Type)` terms. **Compilation flags:** `static` **Template:** `path_template_parameters(PathTemplate,Parameters)` **Mode and number of proofs:** `path_template_parameters(+atom,-list(compound))` - `one_or_error` **Exceptions:** `PathTemplate` is not a valid router path template: `domain_error(http_router_path_template,PathTemplate)` A segment in `PathTemplate` is not a valid router path template segment: `domain_error(http_router_path_template_segment,Segment)` ------------------------------------------------------------------------ ###### `route_not_found_response/2` Optional hook predicate that customizes `404`` ``Not`` ``Found` responses. When defined by the importing object, it is called with the unmatched request and must return the response to send. **Compilation flags:** `static` **Template:** `route_not_found_response(Request,Response)` **Mode and number of proofs:** `route_not_found_response(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_bad_request_response/3` Optional hook predicate that customizes `400`` ``Bad`` ``Request` responses generated from dedicated parameter-validation exceptions raised by route handlers. When defined by the importing object, it is called with the routed request, the structured parameter error list, and must return the response to send. **Compilation flags:** `static` **Template:** `route_bad_request_response(Request,Errors,Response)` **Mode and number of proofs:** `route_bad_request_response(+compound,+list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_method_not_allowed_response/3` Optional hook predicate that customizes `405`` ``Method`` ``Not`` ``Allowed` responses. When defined by the importing object, it is called with the request, the effective allowed methods list as lowercase atoms, and must return the response to send. **Compilation flags:** `static` **Template:** `route_method_not_allowed_response(Request,AllowedMethods,Response)` **Mode and number of proofs:** `route_method_not_allowed_response(+compound,+list(atom),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_automatic_options_response/3` Optional hook predicate that customizes automatic `OPTIONS` responses when no explicit `options` route matches. When defined by the importing object, it is called with the annotated synthetic request, the effective allowed methods list as lowercase atoms, and must return the response to send. **Compilation flags:** `static` **Template:** `route_automatic_options_response(Request,EffectiveMethods,Response)` **Mode and number of proofs:** `route_automatic_options_response(+compound,+list(atom),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `route_not_acceptable_response/3` Optional hook predicate that customizes `406`` ``Not`` ``Acceptable` responses. When defined by the importing object, it is called with the request, the normalized produced media types for the matched route, and must return the response to send. **Compilation flags:** `static` **Template:** `route_not_acceptable_response(Request,ProducedMediaTypes,Response)` **Mode and number of proofs:** `route_not_acceptable_response(+compound,+list(atom),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_server") **object** #### `http_server` User-facing HTTP(S) server facade built on top of the HTTP transport libraries. **Availability:** `logtalk_load(http_server(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls,`` ``threaded` **Imports:** `public` options **Uses:** list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `open/3` - `open/4` - `close/1` - `request_listener_shutdown/1` - `serve_once/3` - `serve_websocket_once/5` - `serve/4` - `serve/5` - `serve/6` - `serve_until_shutdown/5` - `serve_until_shutdown/6` - `request_shutdown/1` - `server_property/2` - `start/4` - `start/5` - `stop/1` - Protected predicates - Private predicates - `server_control_/3` - `server_control_counter_/1` - Operators ##### Public predicates ###### `open/3` Opens a listener on the loopback address using the selected scheme and transport options and returns an opaque server handle. **Compilation flags:** `static` **Template:** `open(Port,Server,Options)` **Mode and number of proofs:** `open(+integer,--compound,+list)` - `one_or_error` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The selected transport object does not exist: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol: `domain_error(http_transport_protocol_object,Transport)` `Options` selects incompatible scheme and transport values: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `Options` selects incompatible scheme and listener transport values: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` `Port` is not a non-negative integer or a variable accepted by the selected transport: `domain_error(non_negative_integer,Port)` `Options` contains listener options rejected by the selected transport: `domain_error(option,Option)` The selected transport cannot open the listener: `resource_error(http_process_transport_listener)` ------------------------------------------------------------------------ ###### `open/4` Opens a listener on the given host using the selected scheme and transport options and returns an opaque server handle. **Compilation flags:** `static` **Template:** `open(Host,Port,Server,Options)` **Mode and number of proofs:** `open(+atom,+integer,--compound,+list)` - `one_or_error` **Exceptions:** `Host` is not a valid listener host atom for the selected transport: `type_error(atom,Host)` `Port` is not a non-negative integer or a variable accepted by the selected transport: `domain_error(non_negative_integer,Port)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The selected transport object does not exist: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol: `domain_error(http_transport_protocol_object,Transport)` `Options` selects incompatible scheme and transport values: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `Options` selects incompatible scheme and listener transport values: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` `Options` contains listener options rejected by the selected transport: `domain_error(option,Option)` The selected transport cannot open the listener: `resource_error(http_process_transport_listener)` ------------------------------------------------------------------------ ###### `close/1` Closes an open server listener. **Compilation flags:** `static` **Template:** `close(Server)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` **Exceptions:** `Server` is a variable: `instantiation_error` `Server` is not an open HTTP server handle: `domain_error(http_server,Server)` `Server` refers to a listener rejected by the selected transport: `domain_error(http_socket_transport_listener,Listener)` `Server` refers to a listener that no longer exists for the selected transport: `existence_error(http_socket_transport_listener,Listener)` ------------------------------------------------------------------------ ###### `request_listener_shutdown/1` Requests shutdown of a blocking accept operation on an open server listener. **Compilation flags:** `static` **Template:** `request_listener_shutdown(Server)` **Mode and number of proofs:** `request_listener_shutdown(+compound)` - `one_or_error` **Exceptions:** `Server` is a variable: `instantiation_error` `Server` is not an HTTP server handle: `domain_error(http_server,Server)` `Server` refers to a listener rejected by the selected transport: `domain_error(http_socket_transport_listener,Listener)` `Server` refers to a listener that no longer exists for the selected transport: `existence_error(http_socket_transport_listener,Listener)` ------------------------------------------------------------------------ ###### `serve_once/3` Serves a single request on an open server listener. **Compilation flags:** `static` **Template:** `serve_once(Server,Handler,ClientInfo)` **Mode and number of proofs:** `serve_once(+compound,+object_identifier,--compound)` - `one_or_error` **Exceptions:** `Server` is a variable: `instantiation_error` `Server` is not an open HTTP server handle: `domain_error(http_server,Server)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `serve_websocket_once/5` Serves a single WebSocket opening handshake on an open server listener. **Compilation flags:** `static` **Template:** `serve_websocket_once(Server,Handler,Connection,Response,ClientInfo)` **Mode and number of proofs:** `serve_websocket_once(+compound,+object_identifier,--compound,--compound,--compound)` - `one_or_error` **Exceptions:** `Server` is a variable: `instantiation_error` `Server` is not an open HTTP server handle: `domain_error(http_server,Server)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The WebSocket opening request does not exist: `existence_error(http_socket_transport_websocket_request,end_of_file)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `serve/4` Serves a bounded number of requests on an open server, or opens a loopback listener, serves requests, and closes it. **Compilation flags:** `static` **Template:** `serve(ServerOrPort,Handler,Count,ClientInfosOrOptions)` **Mode and number of proofs:** `serve(+compound,+object_identifier,+integer,--list)` - `one_or_error` `serve(+integer,+object_identifier,+integer,+list)` - `one_or_error` **Exceptions:** `ServerOrPort` is a variable: `instantiation_error` `ServerOrPort` is neither a variable nor a compound or integer: `type_error(atom_or_compound,ServerOrPort)` `ServerOrPort` is a compound term but not an open HTTP server handle: `domain_error(http_server,ServerOrPort)` `Count` is a variable: `instantiation_error` `Count` is not a non-negative integer: `domain_error(non_negative_integer,Count)` `ClientInfosOrOptions` is a variable when opening a listener from a port: `instantiation_error` `ClientInfosOrOptions` is neither a variable nor a list when opening a listener from a port: `type_error(list,Options)` An element `Option` of the list `ClientInfosOrOptions` is a variable when opening a listener from a port: `instantiation_error` An element `Option` of the list `ClientInfosOrOptions` is neither a variable nor a compound term when opening a listener from a port: `type_error(compound,Option)` An element `Option` of the list `ClientInfosOrOptions` is a compound term but not a valid option when opening a listener from a port: `domain_error(option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The selected transport object does not exist when opening a listener from a port: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol when opening a listener from a port: `domain_error(http_transport_protocol_object,Transport)` `ClientInfosOrOptions` selects incompatible scheme and transport values when opening a listener from a port: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `ClientInfosOrOptions` selects incompatible scheme and listener transport values when opening a listener from a port: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` ------------------------------------------------------------------------ ###### `serve/5` Serves a bounded number of requests on an open server, or opens a loopback listener, serves requests, and closes it. **Compilation flags:** `static` **Template:** `serve(ServerOrPort,Handler,Count,ClientInfos,Options)` **Mode and number of proofs:** `serve(+compound,+object_identifier,+integer,--list,+list)` - `one_or_error` `serve(+integer,+object_identifier,+integer,--list,+list)` - `one_or_error` **Exceptions:** `ServerOrPort` is a variable: `instantiation_error` `ServerOrPort` is neither a variable nor a compound or integer: `type_error(atom_or_compound,ServerOrPort)` `ServerOrPort` is a compound term but not an open HTTP server handle: `domain_error(http_server,ServerOrPort)` `Count` is a variable: `instantiation_error` `Count` is not a non-negative integer: `domain_error(non_negative_integer,Count)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an option that is not valid for serving on an already open server: `domain_error(http_server_serve_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The selected transport object does not exist when opening a listener from a port: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol when opening a listener from a port: `domain_error(http_transport_protocol_object,Transport)` `Options` selects incompatible scheme and transport values when opening a listener from a port: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `Options` selects incompatible scheme and listener transport values when opening a listener from a port: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` `Options` contains listener-serving options rejected by the selected transport: `domain_error(http_socket_transport_listener_option,Option)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` ------------------------------------------------------------------------ ###### `serve/6` Opens a listener on the given host, serves a bounded number of requests, and closes it. **Compilation flags:** `static` **Template:** `serve(Host,Port,Handler,Count,ClientInfos,Options)` **Mode and number of proofs:** `serve(+atom,+integer,+object_identifier,+integer,--list,+list)` - `one_or_error` **Exceptions:** `Host` is not a valid listener host atom for the selected transport: `type_error(atom,Host)` `Port` is not a non-negative integer or a variable accepted by the selected transport: `domain_error(non_negative_integer,Port)` `Count` is a variable: `instantiation_error` `Count` is not a non-negative integer: `domain_error(non_negative_integer,Count)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The selected transport object does not exist: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol: `domain_error(http_transport_protocol_object,Transport)` `Options` selects incompatible scheme and transport values: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `Options` selects incompatible scheme and listener transport values: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` `Options` contains listener-serving options rejected by the selected transport: `domain_error(http_socket_transport_listener_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` The selected transport cannot open or close the listener: `resource_error(http_process_transport_listener)` ------------------------------------------------------------------------ ###### `serve_until_shutdown/5` Opens a listener on the given host and serves requests until shutdown is requested. **Compilation flags:** `static` **Template:** `serve_until_shutdown(Host,Port,Handler,Control,Options)` **Mode and number of proofs:** `serve_until_shutdown(+atom,+integer,+object_identifier,+nonvar,+list)` - `one_or_error` **Exceptions:** `Host` is not a valid listener host atom for the selected transport: `type_error(atom,Host)` `Port` is not a non-negative integer or a variable accepted by the selected transport: `domain_error(non_negative_integer,Port)` `Control` is a variable: `instantiation_error` `Control` is already registered for another open-ended server loop: `permission_error(open,http_server_shutdown_control,Control)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The selected transport object does not exist: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol: `domain_error(http_transport_protocol_object,Transport)` `Options` selects incompatible scheme and transport values: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `Options` selects incompatible scheme and listener transport values: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` `Options` contains listener-serving options rejected by the selected transport: `domain_error(http_socket_transport_listener_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` The selected transport cannot open the listener: `resource_error(http_process_transport_listener)` ------------------------------------------------------------------------ ###### `serve_until_shutdown/6` Opens a listener on the given host, calls Ready after shutdown control registration, and serves requests until shutdown is requested. **Compilation flags:** `static` **Template:** `serve_until_shutdown(Host,Port,Handler,Control,Options,Ready)` **Meta-predicate template:** `serve_until_shutdown(*,*,*,*,*,0)` **Mode and number of proofs:** `serve_until_shutdown(+atom,+integer,+object_identifier,+nonvar,+list,+callable)` - `one_or_error` **Exceptions:** `Host` is not a valid listener host atom for the selected transport: `type_error(atom,Host)` `Port` is not a non-negative integer or a variable accepted by the selected transport: `domain_error(non_negative_integer,Port)` `Control` is a variable: `instantiation_error` `Control` is already registered for another open-ended server loop: `permission_error(open,http_server_shutdown_control,Control)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The selected transport object does not exist: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol: `domain_error(http_transport_protocol_object,Transport)` `Options` selects incompatible scheme and transport values: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `Options` selects incompatible scheme and listener transport values: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` `Options` contains listener-serving options rejected by the selected transport: `domain_error(http_socket_transport_listener_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` The selected transport cannot open the listener: `resource_error(http_process_transport_listener)` ------------------------------------------------------------------------ ###### `request_shutdown/1` Requests shutdown of an open-ended server loop. **Compilation flags:** `static` **Template:** `request_shutdown(Control)` **Mode and number of proofs:** `request_shutdown(+nonvar)` - `one_or_error` **Exceptions:** `Control` is a variable: `instantiation_error` `Control` is not registered for an open-ended server loop: `existence_error(http_server_shutdown_control,Control)` Thread-backed shutdown is not available on this backend: `resource_error(threads)` ------------------------------------------------------------------------ ###### `server_property/2` Enumerates selected properties of a server handle. **Compilation flags:** `static` **Template:** `server_property(Server,Property)` **Mode and number of proofs:** `server_property(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `start/4` Starts an open-ended loopback server in a worker thread and waits until it is ready to accept requests. Throws a resource error when thread support is not available. **Compilation flags:** `static` **Template:** `start(Port,Handler,Server,Options)` **Mode and number of proofs:** `start(+integer,+object_identifier,--compound,+list)` - `one_or_error` **Exceptions:** `Port` is not a non-negative integer or a variable accepted by the selected transport: `domain_error(non_negative_integer,Port)` `Options` specifies a variable shutdown control: `instantiation_error` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The selected transport object does not exist: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol: `domain_error(http_transport_protocol_object,Transport)` `Options` selects incompatible scheme and transport values: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `Options` selects incompatible scheme and listener transport values: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` `Options` contains listener-serving options rejected by the selected transport: `domain_error(http_socket_transport_listener_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` The selected transport cannot open the listener: `resource_error(http_process_transport_listener)` Thread support is not available: `resource_error(threads)` ------------------------------------------------------------------------ ###### `start/5` Starts an open-ended server in a worker thread and waits until it is ready to accept requests. Throws a resource error when thread support is not available. **Compilation flags:** `static` **Template:** `start(Host,Port,Handler,Server,Options)` **Mode and number of proofs:** `start(+atom,+integer,+object_identifier,--compound,+list)` - `one_or_error` **Exceptions:** `Host` is not a valid listener host atom for the selected transport: `type_error(atom,Host)` `Port` is not a non-negative integer or a variable accepted by the selected transport: `domain_error(non_negative_integer,Port)` `Options` specifies a variable shutdown control: `instantiation_error` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The selected transport object does not exist: `existence_error(object,Transport)` The selected transport object does not conform to the HTTP transport protocol: `domain_error(http_transport_protocol_object,Transport)` `Options` selects incompatible scheme and transport values: `consistency_error(http_server_options,scheme(Scheme),transport(Transport))` `Options` selects incompatible scheme and listener transport values: `consistency_error(http_server_options,scheme(Scheme),listener_transport(ListenerTransport))` `Options` contains listener-serving options rejected by the selected transport: `domain_error(http_socket_transport_listener_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` The selected transport cannot open the listener: `resource_error(http_process_transport_listener)` Thread support is not available: `resource_error(threads)` ------------------------------------------------------------------------ ###### `stop/1` Requests shutdown of a threaded server and waits for the worker thread to finish. Throws a resource error when thread support is not available. **Compilation flags:** `static` **Template:** `stop(Server)` **Mode and number of proofs:** `stop(+compound)` - `one_or_error` **Exceptions:** `Server` is a variable: `instantiation_error` `Server` is not a threaded HTTP server handle: `domain_error(http_server,Server)` Thread support is not available: `resource_error(threads)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `server_control_/3` Table of HTTP server shutdown control handles. **Compilation flags:** `dynamic` **Template:** `server_control_(Control,Transport,Server)` **Mode and number of proofs:** `server_control_(?nonvar,?object_identiifer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `server_control_counter_/1` Counter for generating unique HTTP server shutdown control identifiers. **Compilation flags:** `dynamic` **Template:** `server_control_counter_(Counter)` **Mode and number of proofs:** `server_control_counter_(-integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) ### http_server_core") **object** #### `http_server_core` Portable stream-based HTTP server orchestration predicates. **Availability:** `logtalk_load(http_server_core(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` http_message_helpers **Uses:** http_core http_websocket_handshake list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `read_request/2` - `write_response/2` - `dispatch/3` - `serve/3` - `serve_connection/3` - `accept_websocket/3` - `serve_websocket/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `read_request/2` Reads exactly one HTTP request from a binary stream and returns it as a normalized request term. Fails on clean end-of-file before reading any bytes. **Compilation flags:** `static` **Template:** `read_request(Input,Request)` **Mode and number of proofs:** `read_request(+stream,--compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `write_response/2` Writes exactly one normalized HTTP response term to a binary stream. **Compilation flags:** `static` **Template:** `write_response(Output,Response)` **Mode and number of proofs:** `write_response(+stream,+compound)` - `one_or_error` **Exceptions:** `Output` is invalid for the delegated HTTP response generator: `domain_error(http_sink,stream(Output))` `Response` is not a valid normalized HTTP response term: `domain_error(http_response,Response)` The response body file range is outside the file contents: `domain_error(http_body_file_range,file(File,Offset,Length))` ------------------------------------------------------------------------ ###### `dispatch/3` Dispatches a normalized HTTP request to a handler object implementing the http_handler_protocol protocol. Handler failures, exceptions, or invalid responses are converted to an internal server error response. **Compilation flags:** `static` **Template:** `dispatch(Handler,Request,Response)` **Mode and number of proofs:** `dispatch(+object_identifier,+compound,-compound)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `serve/3` Reads one request from a binary input stream, dispatches it to a handler object, and writes one response to a binary output stream. HEAD requests suppress response body bytes on the wire while preserving the generated response headers. Malformed requests are converted to bad request responses. **Compilation flags:** `static` **Template:** `serve(Input,Output,Handler)` **Mode and number of proofs:** `serve(+stream,+stream,+object_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `serve_connection/3` Repeatedly reads requests from a binary input stream, dispatches them to a handler object, and writes responses to a binary output stream until end-of-file, a `101`` ``Switching`` ``Protocols` response, or connection-close semantics terminate the connection. HEAD requests suppress response body bytes on the wire while preserving the generated response headers. **Compilation flags:** `static` **Template:** `serve_connection(Input,Output,Handler)` **Mode and number of proofs:** `serve_connection(+stream,+stream,+object_identifier)` - `one_or_error` **Exceptions:** `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` `Output` is invalid for the delegated HTTP response generator: `domain_error(http_sink,stream(Output))` The generated response is not a valid normalized HTTP response term: `domain_error(http_response,Response)` The response body file range is outside the file contents: `domain_error(http_body_file_range,file(File,Offset,Length))` ------------------------------------------------------------------------ ###### `accept_websocket/3` Validates a normalized WebSocket opening-handshake request and builds a matching `101`` ``Switching`` ``Protocols` response. The `protocol(Protocol)` option can be used to select a single offered subprotocol. **Compilation flags:** `static` **Template:** `accept_websocket(Request,Response,Options)` **Mode and number of proofs:** `accept_websocket(+compound,--compound,+list)` - `one_or_error` **Exceptions:** `Options` contains an invalid WebSocket acceptance option: `domain_error(http_server_core_websocket_option,Option)` `Options` contains reserved WebSocket handshake headers: `domain_error(http_server_core_websocket_headers,Headers)` `Options` contains reserved WebSocket handshake properties: `domain_error(http_server_core_websocket_properties,Properties)` `Request` is not a valid normalized WebSocket opening-handshake request: `domain_error(http_server_core_websocket_request,Request)` `Options` selects a subprotocol not offered by `Request`: `domain_error(http_server_core_websocket_protocol,Protocol)` The generated WebSocket response is not a valid normalized HTTP response term: `domain_error(http_response,Response)` **Remarks:** > - Repeated options: When the same WebSocket acceptance option is given multiple times, the first occurrence is used. ------------------------------------------------------------------------ ###### `serve_websocket/4` Reads one request from a binary input stream, dispatches it to a handler object, writes one response to a binary output stream, and returns `accepted(Request,`` ``Response)` when the exchange completed with a valid WebSocket opening-handshake response. Malformed requests and non-upgrade responses are written to the stream and reported as `rejected(Response)`. Clean end-of-file before any bytes are read is reported as `end_of_file`. **Compilation flags:** `static` **Template:** `serve_websocket(Input,Output,Handler,Outcome)` **Mode and number of proofs:** `serve_websocket(+stream,+stream,+object_identifier,--compound)` - `one_or_error` **Exceptions:** `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` `Output` is invalid for the delegated HTTP response generator: `domain_error(http_sink,stream(Output))` The generated response is not a valid normalized HTTP response term: `domain_error(http_response,Response)` The response body file range is outside the file contents: `domain_error(http_body_file_range,file(File,Offset,Length))` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_session") **object** #### `http_client_session` By default, stateful HTTP client sessions use the `http_socket_transport` library. **Availability:** `logtalk_load(http_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_client_session(http_socket_transport) **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  close/1  cookie_jar/2  default_option/1  default_options/1  delete/4  get/4  head/4  open/1  open/2  option/2  option/3  patch/5  post/5  put/5  request/5  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_client_session(HTTPTransport)` - `HTTPTransport` - The object implementing `http_transport_protocol`. Stateful HTTP client sessions that add cookie persistence on top of the stateless `http_client` facade. **Availability:** `logtalk_load(http_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-12 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_origin_site_helpers **Uses:** http_client http_cookie_jar http_cookies(Representation) http_core list **Remarks:** > - Option precedence: When the same session default or per-request option is given multiple times, the first occurrence is used. > > - Transport options: The `connection_options(Options)` session default and request option forwards one-shot transport configuration to the underlying `http_client` facade. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `open/1` - `open/2` - `close/1` - `cookie_jar/2` - `request/5` - `get/4` - `head/4` - `delete/4` - `post/5` - `put/5` - `patch/5` - Protected predicates - Private predicates - `session_seed_/1` - `session_state_/2` - Operators ##### Public predicates ###### `open/1` Opens a new HTTP session with a freshly created owned cookie jar. **Compilation flags:** `static` **Template:** `open(Session)` **Mode and number of proofs:** `open(-compound)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `open/2` Opens a new HTTP session using the given defaults and cookie-jar options, including `cookies_file(File)` for reopening a saved owned cookie jar and `connection_options(Options)` for one-shot transport configuration. **Compilation flags:** `static` **Template:** `open(Session,Options)` **Mode and number of proofs:** `open(-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid HTTP client session option: `domain_error(http_client_session_option,Option)` `Options` contains an invalid HTTP client session option combination: `domain_error(http_client_session_options,Options)` `Options` contains invalid persisted cookie data: `domain_error(http_cookie_jar_persisted_cookies,PersistedCookies)` ------------------------------------------------------------------------ ###### `close/1` Closes a session and, when applicable, the owned cookie jar created for it. **Compilation flags:** `static` **Template:** `close(Session)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor an open HTTP client session handle: `domain_error(http_client_session,Session)` `Session` refers to a closed HTTP client session handle: `existence_error(http_client_session,http_client_session(SessionId))` ------------------------------------------------------------------------ ###### `cookie_jar/2` Returns the configured cookie jar handle or the atom `none` when the session does not persist cookies. **Compilation flags:** `static` **Template:** `cookie_jar(Session,Jar)` **Mode and number of proofs:** `cookie_jar(+compound,-term)` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor an open HTTP client session handle: `domain_error(http_client_session,Session)` `Session` refers to a closed HTTP client session handle: `existence_error(http_client_session,http_client_session(SessionId))` ------------------------------------------------------------------------ ###### `request/5` Performs one HTTP request using session defaults and automatic cookie replay/storage. Per-request options can include `connection_options(Options)` for one-shot transport configuration, `source_url(URL)` for an absolute HTTP or HTTPS URL, `source_origin(Origin)` for a bare Origin header value, and `top_level_navigation(Boolean)` to drive SameSite-aware cookie replay. When omitted, SameSite replay defaults to `source_url(URL)` and `top_level_navigation(false)`. **Compilation flags:** `static` **Template:** `request(Session,Method,URL,Response,Options)` **Mode and number of proofs:** `request(+compound,+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor an open HTTP client session handle: `domain_error(http_client_session,Session)` `Session` refers to a closed HTTP client session handle: `existence_error(http_client_session,http_client_session(SessionId))` `Options` is a variable or a partial list: `instantiation_error` `Options` contains invalid HTTP client session request options: `domain_error(http_client_session_request_options,Options)` `Options` contains an invalid HTTP client session request option: `domain_error(http_client_session_request_option,Option)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `URL` uses an unsupported HTTP scheme: `domain_error(http_client_scheme,Scheme)` Cookie replay uses an invalid request context: `domain_error(http_cookie_jar_request_context,RequestContext)` The stateless HTTP client rejects the request option: `domain_error(http_client_request_option,Option)` ------------------------------------------------------------------------ ###### `get/4` Convenience wrapper over request/5 using the `get` method. **Compilation flags:** `static` **Template:** `get(Session,URL,Response,Options)` **Mode and number of proofs:** `get(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open HTTP client session handle: `domain_error(http_client_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Options` contains invalid HTTP client session request options: `domain_error(http_client_session_request_options,Options)` ------------------------------------------------------------------------ ###### `head/4` Convenience wrapper over request/5 using the `head` method. **Compilation flags:** `static` **Template:** `head(Session,URL,Response,Options)` **Mode and number of proofs:** `head(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open HTTP client session handle: `domain_error(http_client_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Options` contains invalid HTTP client session request options: `domain_error(http_client_session_request_options,Options)` ------------------------------------------------------------------------ ###### `delete/4` Convenience wrapper over request/5 using the `delete` method. **Compilation flags:** `static` **Template:** `delete(Session,URL,Response,Options)` **Mode and number of proofs:** `delete(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open HTTP client session handle: `domain_error(http_client_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Options` contains invalid HTTP client session request options: `domain_error(http_client_session_request_options,Options)` ------------------------------------------------------------------------ ###### `post/5` Convenience wrapper over request/5 using the `post` method and the given body. **Compilation flags:** `static` **Template:** `post(Session,URL,Body,Response,Options)` **Mode and number of proofs:** `post(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open HTTP client session handle: `domain_error(http_client_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` `Options` contains invalid HTTP client session request options: `domain_error(http_client_session_request_options,Options)` ------------------------------------------------------------------------ ###### `put/5` Convenience wrapper over request/5 using the `put` method and the given body. **Compilation flags:** `static` **Template:** `put(Session,URL,Body,Response,Options)` **Mode and number of proofs:** `put(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open HTTP client session handle: `domain_error(http_client_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` `Options` contains invalid HTTP client session request options: `domain_error(http_client_session_request_options,Options)` ------------------------------------------------------------------------ ###### `patch/5` Convenience wrapper over request/5 using the `patch` method and the given body. **Compilation flags:** `static` **Template:** `patch(Session,URL,Body,Response,Options)` **Mode and number of proofs:** `patch(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is not an open HTTP client session handle: `domain_error(http_client_session,Session)` `URL` is not a supported absolute HTTP URL: `domain_error(http_client_url,URL)` `Body` is invalid for the generated normalized HTTP request: `domain_error(http_body,Body)` `Options` contains invalid HTTP client session request options: `domain_error(http_client_session_request_options,Options)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `session_seed_/1` Last allocated session identifier. **Compilation flags:** `dynamic` **Template:** `session_seed_(SessionId)` **Mode and number of proofs:** `session_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `session_state_/2` Per-session stored cookie jar ownership and default request state. **Compilation flags:** `dynamic` **Template:** `session_state_(SessionId,State)` **Mode and number of proofs:** `session_state_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `http_cookie_jar` HTTP cookie jar implementing explicit storage and request matching on top of the http_cookies parsing and generation predicates, with explicit save and load operations for persisting jar contents. **Availability:** `logtalk_load(http_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` http_text_helpers `public` http_origin_site_helpers `public` options **Uses:** date http_cookies(Representation) list os url(Representation) user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `open/1` - `open/2` - `close/1` - `clear/1` - `store_set_cookies/3` - `request_cookies/3` - `request_cookies/4` - `cookies/2` - `cookie_count/2` - `save/2` - `load/2` - Protected predicates - Private predicates - `jar_seed_/1` - `jar_state_/2` - `jar_cookie_/11` - Operators ##### Public predicates ###### `open/1` Opens a new empty cookie jar. **Compilation flags:** `static` **Template:** `open(Jar)` **Mode and number of proofs:** `open(-compound)` - `one` ------------------------------------------------------------------------ ###### `open/2` Opens a new cookie jar using the given options list. Supported options include `cookies_file(File)` for preloading previously persisted cookies from disk. **Compilation flags:** `static` **Template:** `open(Jar,Options)` **Mode and number of proofs:** `open(-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The cookies file option is a variable: `instantiation_error` The cookies file option is neither a variable nor an atom: `type_error(atom,File)` The persisted cookie data is malformed: `domain_error(http_cookie_jar_persisted_cookies,PersistedCookies)` A persisted cookie is malformed: `domain_error(http_cookie_jar_persisted_cookie,PersistedCookie)` ------------------------------------------------------------------------ ###### `close/1` Closes a cookie jar and removes all stored cookies. **Compilation flags:** `static` **Template:** `close(Jar)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` ------------------------------------------------------------------------ ###### `clear/1` Removes all currently stored cookies from a cookie jar while keeping the jar handle valid. **Compilation flags:** `static` **Template:** `clear(Jar)` **Mode and number of proofs:** `clear(+compound)` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` ------------------------------------------------------------------------ ###### `store_set_cookies/3` Stores normalized Set-Cookie terms for the given absolute URL, replacing existing cookies with the same name, domain, and path. **Compilation flags:** `static` **Template:** `store_set_cookies(Jar,URL,SetCookies)` **Mode and number of proofs:** `store_set_cookies(+compound,+atom,+list(compound))` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute cookie-jar URL: `domain_error(http_cookie_jar_url,URL)` `URL` uses an unsupported cookie-jar URL scheme: `domain_error(http_cookie_jar_url_scheme,Scheme)` `SetCookies` is a variable or a partial list: `instantiation_error` `SetCookies` is not a valid set-cookie list: `domain_error(http_cookie_jar_set_cookies,SetCookies)` An element `SetCookie` of `SetCookies` is not a valid normalized Set-Cookie term: `domain_error(http_cookie_jar_set_cookie,SetCookie)` ------------------------------------------------------------------------ ###### `request_cookies/3` Returns the cookie name-value pairs currently applicable to the given absolute URL using the convenience default `request_context(get,`` ``source_url(URL),`` ``false)`. **Compilation flags:** `static` **Template:** `request_cookies(Jar,URL,Cookies)` **Mode and number of proofs:** `request_cookies(+compound,+atom,-list(compound))` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute cookie-jar URL: `domain_error(http_cookie_jar_url,URL)` `URL` uses an unsupported cookie-jar URL scheme: `domain_error(http_cookie_jar_url_scheme,Scheme)` ------------------------------------------------------------------------ ###### `request_cookies/4` Returns the cookie name-value pairs currently applicable to the given absolute URL for an explicit request context represented as `request_context(Method,`` ``Source,`` ``TopLevelNavigation)` where `Source` is either `source_url(URL)` for an absolute HTTP or HTTPS URL or `source_origin(Origin)` for a bare Origin header value. **Compilation flags:** `static` **Template:** `request_cookies(Jar,URL,RequestContext,Cookies)` **Mode and number of proofs:** `request_cookies(+compound,+atom,+compound,-list(compound))` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` `URL` is a variable: `instantiation_error` `URL` is not a supported absolute cookie-jar URL: `domain_error(http_cookie_jar_url,URL)` `URL` uses an unsupported cookie-jar URL scheme: `domain_error(http_cookie_jar_url_scheme,Scheme)` `RequestContext` is not a valid cookie-jar request context: `domain_error(http_cookie_jar_request_context,RequestContext)` `RequestContext` contains an invalid method: `type_error(atom,Method)` `RequestContext` contains an invalid source: `domain_error(http_cookie_jar_request_source,Source)` `RequestContext` contains an invalid top-level-navigation flag: `domain_error(boolean,TopLevelNavigation)` ------------------------------------------------------------------------ ###### `cookies/2` Returns the currently stored cookies as cookie(Name, Value, Attributes) terms. **Compilation flags:** `static` **Template:** `cookies(Jar,Cookies)` **Mode and number of proofs:** `cookies(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` ------------------------------------------------------------------------ ###### `cookie_count/2` Returns the number of currently stored cookies. **Compilation flags:** `static` **Template:** `cookie_count(Jar,Count)` **Mode and number of proofs:** `cookie_count(+compound,-integer)` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` ------------------------------------------------------------------------ ###### `save/2` Persists the currently stored cookies to a file using a canonical Logtalk term representation. **Compilation flags:** `static` **Template:** `save(Jar,File)` **Mode and number of proofs:** `save(+compound,+atom)` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` ------------------------------------------------------------------------ ###### `load/2` Loads previously persisted cookies from a file, replacing the current jar contents. **Compilation flags:** `static` **Template:** `load(Jar,File)` **Mode and number of proofs:** `load(+compound,+atom)` - `one_or_error` **Exceptions:** `Jar` is a variable: `instantiation_error` `Jar` is neither a variable nor an open cookie-jar handle: `domain_error(http_cookie_jar,Jar)` `Jar` refers to a closed cookie-jar handle: `existence_error(http_cookie_jar,cookie_jar(JarId))` `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` The persisted cookie data is malformed: `domain_error(http_cookie_jar_persisted_cookies,PersistedCookies)` A persisted cookie is malformed: `domain_error(http_cookie_jar_persisted_cookie,PersistedCookie)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `jar_seed_/1` Last allocated cookie jar identifier. **Compilation flags:** `dynamic` **Template:** `jar_seed_(JarId)` **Mode and number of proofs:** `jar_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `jar_state_/2` Per-jar creation index counter state. **Compilation flags:** `dynamic` **Template:** `jar_state_(JarId,CreationIndex)` **Mode and number of proofs:** `jar_state_(?positive_integer,?non_negative_integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `jar_cookie_/11` Stored cookie entries indexed by jar identifier. **Compilation flags:** `dynamic` **Template:** `jar_cookie_(JarId,Name,Domain,Path,Value,HostOnly,Secure,HttpOnly,SameSite,Expiry,CreationIndex)` **Mode and number of proofs:** `jar_cookie_(?positive_integer,?atom,?atom,?atom,?atom,?boolean,?boolean,?boolean,?nonvar,?nonvar,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **category** #### `http_router_server_session(Manager)` - `Manager` - Server-session manager handle used for request begin and response finish processing. Optional server-session middleware helpers for router objects importing the `http_router` category. **Availability:** `logtalk_load(http_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static` **Uses:** http_server_core_session **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `annotate_server_session_request/2` - `add_server_session_response/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `annotate_server_session_request/2` Router middleware helper that annotates a normalized request with a server-session handle and state before route dispatch. **Compilation flags:** `static` **Template:** `annotate_server_session_request(Request,Action)` **Mode and number of proofs:** `annotate_server_session_request(+compound,-compound)` - `one_or_error` **Exceptions:** The configured manager is not an open server-session manager handle: `domain_error(http_server_core_session,Manager)` `Request` is not a valid normalized HTTP request: `domain_error(http_server_core_session_request,Request)` ------------------------------------------------------------------------ ###### `add_server_session_response/3` Router response-middleware helper that finalizes server-session cookie lifecycle changes after route dispatch. **Compilation flags:** `static` **Template:** `add_server_session_response(Request,Response0,Response)` **Mode and number of proofs:** `add_server_session_response(+compound,+compound,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid annotated server-session request: `domain_error(http_server_core_session_request,Request)` `Response0` is not a valid normalized HTTP response: `domain_error(http_server_core_session_response,Response0)` The decorated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_server_core_session` Server-side HTTP session manager over normalized request and response terms using opaque cookie identifiers and an in-memory session store. **Availability:** `logtalk_load(http_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** date http_cookies(Representation) http_core ids list os **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `open/1` - `open/2` - `close/1` - `begin/3` - `finish/3` - `current/2` - `ensure/2` - `data/2` - `get/3` - `set/3` - `remove/3` - `destroy/1` - `renew/2` - `gc/2` - `count/2` - Protected predicates - `http_server_core_session_event/2` - Private predicates - `manager_seed_/1` - `manager_state_/2` - `context_seed_/1` - `context_state_/2` - `stored_session_/6` - Operators ##### Public predicates ###### `open/1` Opens a new server-session manager using the default cookie and timeout options. **Compilation flags:** `static` **Template:** `open(Manager)` **Mode and number of proofs:** `open(-compound)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `open/2` Opens a new server-session manager using the given cookie, timeout, and store options. **Compilation flags:** `static` **Template:** `open(Manager,Options)` **Mode and number of proofs:** `open(-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` ------------------------------------------------------------------------ ###### `close/1` Closes a server-session manager and discards all in-memory request contexts and stored sessions owned by it. **Compilation flags:** `static` **Template:** `close(Manager)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` **Exceptions:** `Manager` is a variable: `instantiation_error` `Manager` is neither a variable nor an open server-session manager handle: `domain_error(http_server_core_session,Manager)` ------------------------------------------------------------------------ ###### `begin/3` Begins server-session processing for a normalized request, annotating it with a per-request session handle and the current session state. **Compilation flags:** `static` **Template:** `begin(Manager,Request,AnnotatedRequest)` **Mode and number of proofs:** `begin(+compound,+compound,-compound)` - `one_or_error` **Exceptions:** `Manager` is a variable: `instantiation_error` `Manager` is neither a variable nor an open server-session manager handle: `domain_error(http_server_core_session,Manager)` `Request` is not a valid normalized HTTP request: `domain_error(http_server_core_session_request,Request)` ------------------------------------------------------------------------ ###### `finish/3` Finishes server-session processing for an annotated normalized request and a normalized response, adding any needed Set-Cookie lifecycle properties. **Compilation flags:** `static` **Template:** `finish(Request,Response0,Response)` **Mode and number of proofs:** `finish(+compound,+compound,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid annotated server-session request: `domain_error(http_server_core_session_request,Request)` `Response0` is not a valid normalized HTTP response: `domain_error(http_server_core_session_response,Response0)` The decorated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `current/2` Returns the request-bound current server-session handle from an annotated normalized request. **Compilation flags:** `static` **Template:** `current(Request,Session)` **Mode and number of proofs:** `current(+compound,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid annotated server-session request: `domain_error(http_server_core_session_request,Request)` ------------------------------------------------------------------------ ###### `ensure/2` Ensures that the annotated request has a backing stored server session and returns its request-bound handle. **Compilation flags:** `static` **Template:** `ensure(Request,Session)` **Mode and number of proofs:** `ensure(+compound,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid annotated server-session request: `domain_error(http_server_core_session_request,Request)` ------------------------------------------------------------------------ ###### `data/2` Returns the current session key-value data pairs for a request-bound server-session handle or `[]` when no backing session exists yet. **Compilation flags:** `static` **Template:** `data(Session,Data)` **Mode and number of proofs:** `data(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is not a valid request-bound server-session handle: `domain_error(http_server_core_session_handle,Session)` ------------------------------------------------------------------------ ###### `get/3` Returns the current value for a session data key from a request-bound server-session handle. **Compilation flags:** `static` **Template:** `get(Session,Key,Value)` **Mode and number of proofs:** `get(+compound,+term,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `set/3` Sets or replaces a session data key-value pair, creating a backing stored session when needed. **Compilation flags:** `static` **Template:** `set(Session,Key,Value)` **Mode and number of proofs:** `set(+compound,+term,+term)` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is not a valid request-bound server-session handle: `domain_error(http_server_core_session_handle,Session)` ------------------------------------------------------------------------ ###### `remove/3` Removes a session data key-value pair and returns its previous value. **Compilation flags:** `static` **Template:** `remove(Session,Key,Value)` **Mode and number of proofs:** `remove(+compound,+term,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `destroy/1` Destroys the backing stored session, causing finish/3 to emit a deletion cookie when applicable. **Compilation flags:** `static` **Template:** `destroy(Session)` **Mode and number of proofs:** `destroy(+compound)` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is not a valid request-bound server-session handle: `domain_error(http_server_core_session_handle,Session)` ------------------------------------------------------------------------ ###### `renew/2` Renews the backing stored session identifier and returns the new opaque cookie identifier. **Compilation flags:** `static` **Template:** `renew(Session,NewIdentifier)` **Mode and number of proofs:** `renew(+compound,-atom)` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is not a valid request-bound server-session handle: `domain_error(http_server_core_session_handle,Session)` ------------------------------------------------------------------------ ###### `gc/2` Performs opportunistic garbage collection of expired stored sessions for the given manager and returns the number collected. **Compilation flags:** `static` **Template:** `gc(Manager,Collected)` **Mode and number of proofs:** `gc(+compound,-integer)` - `one_or_error` **Exceptions:** `Manager` is a variable: `instantiation_error` `Manager` is neither a variable nor an open server-session manager handle: `domain_error(http_server_core_session,Manager)` ------------------------------------------------------------------------ ###### `count/2` Returns the number of currently stored sessions owned by the given manager. **Compilation flags:** `static` **Template:** `count(Manager,Count)` **Mode and number of proofs:** `count(+compound,-integer)` - `one_or_error` **Exceptions:** `Manager` is a variable: `instantiation_error` `Manager` is neither a variable nor an open server-session manager handle: `domain_error(http_server_core_session,Manager)` ------------------------------------------------------------------------ ##### Protected predicates ###### `http_server_core_session_event/2` Optional overridable hook predicate called with server-session lifecycle events. **Compilation flags:** `static` **Template:** `http_server_core_session_event(Manager,Event)` **Mode and number of proofs:** `http_server_core_session_event(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates ###### `manager_seed_/1` Last allocated server-session manager identifier. **Compilation flags:** `dynamic` **Template:** `manager_seed_(ManagerId)` **Mode and number of proofs:** `manager_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `manager_state_/2` Per-manager cookie, timeout, and garbage-collection state. **Compilation flags:** `dynamic` **Template:** `manager_state_(ManagerId,State)` **Mode and number of proofs:** `manager_state_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `context_seed_/1` Last allocated request context identifier. **Compilation flags:** `dynamic` **Template:** `context_seed_(ContextId)` **Mode and number of proofs:** `context_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `context_state_/2` Per-request server-session context state. **Compilation flags:** `dynamic` **Template:** `context_state_(ContextId,Context)` **Mode and number of proofs:** `context_state_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `stored_session_/6` Stored server-session data entries owned by a manager. **Compilation flags:** `dynamic` **Template:** `stored_session_(ManagerId,SessionId,Data,CreatedAt,LastSeenAt,AbsoluteExpiryAt)` **Mode and number of proofs:** `stored_session_(?positive_integer,?atom,?list(compound),?non_negative_integer,?non_negative_integer,?nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `http_server_core_session_handler(Manager,Handler)` - `Manager` - Server-session manager handle. - `Handler` - Wrapped object implementing the `http_handler_protocol` protocol. Wrapper HTTP handler object that applies server-session begin and finish processing around another portable HTTP handler. **Availability:** `logtalk_load(http_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_handler_protocol **Uses:** http_server_core_session **Remarks:** (none) **Inherited public predicates:**  handle/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_socket_transport") **object** #### `http_socket_transport` Sockets-backed HTTP transport predicates built on top of the `sockets`, `http_client_core`, and `http_server_core` libraries. **Availability:** `logtalk_load(http_socket_transport(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls,`` ``threaded` **Implements:** `public` http_transport_protocol **Imports:** `public` options `public` http_message_helpers `public` http_text_helpers **Uses:** http_client_core http_core http_server_core list socket user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  close_connection/1  close_connection_pool/1  close_listener/1  connection_pool_stats/2  connection_streams/3  default_option/1  default_options/1  exchange/3  exchange/4  exchange/5  exchange_sequence/3  exchange_sequence/4  open_connection/4  open_connection_pool/4  open_listener/4  option/2  option/3  request_listener_shutdown/1  request_shutdown/1  serve_listener/4  serve_listener/5  serve_once/3  serve_until_shutdown/4  serve_until_shutdown/5  serve_websocket_once/5  supported_request_scheme/1  supported_websocket_scheme/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `connection_pool_seed_/1` - `connection_pool_config_/6` - `connection_pool_available_/2` - `connection_pool_in_use_/2` - `listener_shutdown_seed_/1` - `listener_shutdown_control_/3` - `listener_shutdown_requested_/2` - `listener_active_worker_/3` - `listener_endpoint_/3` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `connection_pool_seed_/1` Last allocated connection pool identifier. **Compilation flags:** `dynamic` **Template:** `connection_pool_seed_(PoolId)` **Mode and number of proofs:** `connection_pool_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `connection_pool_config_/6` Stored connection pool configuration indexed by pool identifier. **Compilation flags:** `dynamic` **Template:** `connection_pool_config_(PoolId,Host,Port,MinSize,MaxSize,ConnectionOptions)` **Mode and number of proofs:** `connection_pool_config_(?positive_integer,?atom,?integer,?non_negative_integer,?positive_integer,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `connection_pool_available_/2` Reusable idle client connections indexed by pool identifier. **Compilation flags:** `dynamic` **Template:** `connection_pool_available_(PoolId,Connection)` **Mode and number of proofs:** `connection_pool_available_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `connection_pool_in_use_/2` Checked-out client connections indexed by pool identifier. **Compilation flags:** `dynamic` **Template:** `connection_pool_in_use_(PoolId,Connection)` **Mode and number of proofs:** `connection_pool_in_use_(?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `listener_shutdown_seed_/1` Last allocated shutdown run identifier for open-ended listener loops. **Compilation flags:** `dynamic` **Template:** `listener_shutdown_seed_(RunId)` **Mode and number of proofs:** `listener_shutdown_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `listener_shutdown_control_/3` Registered shutdown control terms and their associated listeners. **Compilation flags:** `dynamic` **Template:** `listener_shutdown_control_(Control,Listener,RunId)` **Mode and number of proofs:** `listener_shutdown_control_(?nonvar,?compound,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `listener_shutdown_requested_/2` Recorded shutdown requests indexed by control term and run identifier. **Compilation flags:** `dynamic` **Template:** `listener_shutdown_requested_(Control,RunId)` **Mode and number of proofs:** `listener_shutdown_requested_(?nonvar,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `listener_active_worker_/3` Active listener worker records indexed by control term and run identifier. **Compilation flags:** `dynamic` **Template:** `listener_active_worker_(Control,RunId,Worker)` **Mode and number of proofs:** `listener_active_worker_(?nonvar,?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `listener_endpoint_/3` Stored listener endpoints indexed by listener handle. **Compilation flags:** `dynamic` **Template:** `listener_endpoint_(Listener,Host,Port)` **Mode and number of proofs:** `listener_endpoint_(?compound,?atom,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `http_transport_protocol` HTTP transport predicates for client connections and server listeners. **Availability:** `logtalk_load(http_socket_transport(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `open_listener/4` - `close_listener/1` - `request_listener_shutdown/1` - `open_connection/4` - `close_connection/1` - `connection_streams/3` - `open_connection_pool/4` - `close_connection_pool/1` - `connection_pool_stats/2` - `exchange/3` - `exchange_sequence/3` - `exchange/4` - `exchange/5` - `exchange_sequence/4` - `serve_once/3` - `serve_websocket_once/5` - `serve_listener/4` - `serve_listener/5` - `serve_until_shutdown/4` - `serve_until_shutdown/5` - `request_shutdown/1` - `supported_request_scheme/1` - `supported_websocket_scheme/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `open_listener/4` Opens a TCP listener on the given host and port using the given socket options. If Port is a variable, it is unified with the bound port number. **Compilation flags:** `static` **Template:** `open_listener(Host,Port,Listener,Options)` **Mode and number of proofs:** `open_listener(+atom,?integer,--compound,+list)` - `one_or_error` **Exceptions:** `Host` is not a valid listener host atom: `type_error(atom,Host)` `Port` is not a non-negative integer or a variable: `domain_error(non_negative_integer,Port)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid listener option: `domain_error(http_process_transport_listener_option,Option)` `Options` contains an invalid listener helper executable: `domain_error(http_process_transport_listener_helper_executable,Executable)` `Options` contains incompatible TCP listener options: `domain_error(http_process_transport_listener_tcp_options,[listener_transport(tcp),temporary_tls_credentials(TemporaryTLSCredentialsPrefix)])` `Options` contains incompatible TLS listener options: `domain_error(http_process_transport_listener_tls_options,[tls_certificate_file(CertificateFile),tls_key_file(KeyFile)])` Temporary TLS credentials cannot be created: `resource_error(http_process_transport_temporary_tls_credentials)` The process-backed listener helper cannot be started: `resource_error(http_process_transport_listener)` ------------------------------------------------------------------------ ###### `close_listener/1` Closes a listener previously opened with open_listener/4. **Compilation flags:** `static` **Template:** `close_listener(Listener)` **Mode and number of proofs:** `close_listener(+compound)` - `one_or_error` **Exceptions:** `Listener` is a variable: `instantiation_error` `Listener` is not an open listener handle for the transport implementation: `domain_error(http_socket_transport_listener,Listener)` `Listener` no longer exists for the transport implementation: `existence_error(http_socket_transport_listener,Listener)` ------------------------------------------------------------------------ ###### `request_listener_shutdown/1` Best-effort wakeup request for a listener accept loop opened with `open_listener/4`. This predicate does not close the listener but causes a blocked accept call to return portably when possible. **Compilation flags:** `static` **Template:** `request_listener_shutdown(Listener)` **Mode and number of proofs:** `request_listener_shutdown(+compound)` - `one_or_error` **Exceptions:** `Listener` is a variable: `instantiation_error` `Listener` is not an open listener handle for the transport implementation: `domain_error(http_socket_transport_listener,Listener)` `Listener` no longer exists for the transport implementation: `existence_error(http_socket_transport_listener,Listener)` ------------------------------------------------------------------------ ###### `open_connection/4` Opens a reusable client connection to the given host and port using the given socket options. **Compilation flags:** `static` **Template:** `open_connection(Host,Port,Connection,Options)` **Mode and number of proofs:** `open_connection(+atom,+integer,--compound,+list)` - `one_or_error` **Exceptions:** `Host` and `Port` are not a valid HTTP authority target: `domain_error(http_target,authority(Host,Port))` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid connection option: `domain_error(http_process_transport_connection_option,Option)` The process-backed client helper cannot be started: `resource_error(http_process_transport_connection)` ------------------------------------------------------------------------ ###### `close_connection/1` Closes a reusable client connection previously opened with open_connection/4. **Compilation flags:** `static` **Template:** `close_connection(Connection)` **Mode and number of proofs:** `close_connection(+compound)` - `one_or_error` **Exceptions:** `Connection` is a variable: `instantiation_error` `Connection` is not an open reusable client connection handle: `domain_error(http_socket_transport_connection,Connection)` ------------------------------------------------------------------------ ###### `connection_streams/3` Returns the binary input and output streams carried by a reusable client connection handle or by an upgraded WebSocket connection handle returned by `serve_websocket_once/5`. **Compilation flags:** `static` **Template:** `connection_streams(Connection,Input,Output)` **Mode and number of proofs:** `connection_streams(+compound,--stream,--stream)` - `one_or_error` **Exceptions:** `Connection` is a variable: `instantiation_error` `Connection` is not an open reusable client or upgraded WebSocket connection handle: `domain_error(http_socket_transport_connection,Connection)` ------------------------------------------------------------------------ ###### `open_connection_pool/4` Opens a managed reusable connection pool for the given host and port. **Compilation flags:** `static` **Template:** `open_connection_pool(Host,Port,Pool,Options)` **Mode and number of proofs:** `open_connection_pool(+atom,+integer,--compound,+list)` - `one_or_error` **Exceptions:** `Host` and `Port` are not a valid HTTP authority target: `domain_error(http_target,authority(Host,Port))` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid connection-pool option: `domain_error(http_socket_transport_connection_pool_option,Option)` `Options` contains an invalid process-backed connection-pool option: `domain_error(http_process_transport_connection_pool_option,Option)` `Options` contains incompatible connection-pool bounds: `domain_error(http_socket_transport_connection_pool_options,[min_size(MinSize),max_size(MaxSize)])` `Options` contains incompatible process-backed connection-pool bounds: `domain_error(http_process_transport_connection_pool_options,[min_size(MinSize),max_size(MaxSize)])` No managed connection is available in the connection pool: `resource_error(http_socket_transport_connection_pool)` The process-backed client helper cannot be started: `resource_error(http_process_transport_connection)` **Remarks:** > - Option `min_size(N)`: Pre-open N reusable client connections when creating the pool. The default is `0`. > > - Option `max_size(N)`: Allow at most N managed client connections in the pool. The default is `10`. > > - Option `connection_options(Options)`: Socket options passed to `open_connection/4` when creating pooled connections. The default is `[]`. ------------------------------------------------------------------------ ###### `close_connection_pool/1` Closes a managed reusable connection pool and all currently available pooled connections. Throws if pooled exchanges are still in progress. **Compilation flags:** `static` **Template:** `close_connection_pool(Pool)` **Mode and number of proofs:** `close_connection_pool(+compound)` - `one_or_error` **Exceptions:** `Pool` is a variable: `instantiation_error` `Pool` is not a valid managed connection-pool handle: `domain_error(http_socket_transport_connection_pool,Pool)` `Pool` no longer exists: `existence_error(http_socket_transport_connection_pool,Pool)` `Pool` cannot be closed while pooled exchanges remain active: `permission_error(close,http_socket_transport_connection_pool,Pool)` ------------------------------------------------------------------------ ###### `connection_pool_stats/2` Returns managed pool statistics as stats(Available, InUse, Total, MinSize, MaxSize). **Compilation flags:** `static` **Template:** `connection_pool_stats(Pool,Stats)` **Mode and number of proofs:** `connection_pool_stats(+compound,--compound)` - `one_or_error` **Exceptions:** `Pool` is a variable: `instantiation_error` `Pool` is not a valid managed connection-pool handle: `domain_error(http_socket_transport_connection_pool,Pool)` `Pool` no longer exists: `existence_error(http_socket_transport_connection_pool,Pool)` ------------------------------------------------------------------------ ###### `exchange/3` Performs a single HTTP exchange on an open reusable client connection or by temporarily acquiring a pooled reusable client connection. **Compilation flags:** `static` **Template:** `exchange(ConnectionOrPool,Request,Response)` **Mode and number of proofs:** `exchange(+compound,+compound,--compound)` - `one_or_error` **Exceptions:** `ConnectionOrPool` is a variable: `instantiation_error` `ConnectionOrPool` is neither an open connection nor a managed connection-pool handle: `domain_error(http_socket_transport_connection,ConnectionOrPool)` `ConnectionOrPool` is not a valid managed connection-pool handle: `domain_error(http_socket_transport_connection_pool,ConnectionOrPool)` `ConnectionOrPool` no longer exists as a managed connection pool: `existence_error(http_socket_transport_connection_pool,ConnectionOrPool)` No managed connection is available in the connection pool: `resource_error(http_socket_transport_connection_pool)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The response stream cannot be parsed as a normalized HTTP response: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `exchange_sequence/3` Performs a sequence of HTTP exchanges on an open reusable client connection or by temporarily acquiring a pooled reusable client connection while HTTP persistence rules allow it. **Compilation flags:** `static` **Template:** `exchange_sequence(ConnectionOrPool,Requests,Responses)` **Mode and number of proofs:** `exchange_sequence(+compound,++list(compound),--list(compound))` - `one_or_error` **Exceptions:** `ConnectionOrPool` is a variable: `instantiation_error` `ConnectionOrPool` is neither an open connection nor a managed connection-pool handle: `domain_error(http_socket_transport_connection,ConnectionOrPool)` `ConnectionOrPool` is not a valid managed connection-pool handle: `domain_error(http_socket_transport_connection_pool,ConnectionOrPool)` `ConnectionOrPool` no longer exists as a managed connection pool: `existence_error(http_socket_transport_connection_pool,ConnectionOrPool)` No managed connection is available in the connection pool: `resource_error(http_socket_transport_connection_pool)` `Requests` is not a list of normalized HTTP request terms: `domain_error(http_request_sequence,Requests)` The response stream cannot be parsed as a normalized HTTP response: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `exchange/4` Opens a client socket connection to the given host and port, performs a single HTTP exchange, and closes the connection. When the request does not already specify connection handling, `Connection:`` ``close` is added automatically. **Compilation flags:** `static` **Template:** `exchange(Host,Port,Request,Response)` **Mode and number of proofs:** `exchange(+atom,+integer,+compound,--compound)` - `one_or_error` **Exceptions:** `Host` and `Port` are not a valid HTTP authority target: `domain_error(http_target,authority(Host,Port))` The process-backed client helper cannot be started: `resource_error(http_process_transport_connection)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The response stream cannot be parsed as a normalized HTTP response: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `exchange/5` Opens a client socket connection to the given host and port using the given connection options, performs a single HTTP exchange, and closes the connection. When the request does not already specify connection handling, `Connection:`` ``close` is added automatically. **Compilation flags:** `static` **Template:** `exchange(Host,Port,Request,Response,Options)` **Mode and number of proofs:** `exchange(+atom,+integer,+compound,--compound,+list)` - `one_or_error` **Exceptions:** `Host` and `Port` are not a valid HTTP authority target: `domain_error(http_target,authority(Host,Port))` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid connection option: `domain_error(http_process_transport_connection_option,Option)` The process-backed client helper cannot be started: `resource_error(http_process_transport_connection)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` The response stream cannot be parsed as a normalized HTTP response: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `exchange_sequence/4` Opens a client socket connection to the given host and port, performs a sequence of HTTP exchanges on that connection, and closes the connection. When the last request does not already specify connection handling, `Connection:`` ``close` is added automatically to that final request. **Compilation flags:** `static` **Template:** `exchange_sequence(Host,Port,Requests,Responses)` **Mode and number of proofs:** `exchange_sequence(+atom,+integer,++list(compound),--list(compound))` - `one_or_error` **Exceptions:** `Host` and `Port` are not a valid HTTP authority target: `domain_error(http_target,authority(Host,Port))` The process-backed client helper cannot be started: `resource_error(http_process_transport_connection)` `Requests` is not a list of normalized HTTP request terms: `domain_error(http_request_sequence,Requests)` The response stream cannot be parsed as a normalized HTTP response: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `serve_once/3` Accepts one incoming socket connection on the given server socket, serves that connection using the http_server_core library, closes the streams, and returns client information. **Compilation flags:** `static` **Template:** `serve_once(ServerSocket,Handler,ClientInfo)` **Mode and number of proofs:** `serve_once(+compound,+object_identifier,--compound)` - `one_or_error` **Exceptions:** `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `serve_websocket_once/5` Accepts one incoming socket connection on the given listener, serves exactly one WebSocket opening handshake using the given handler, and on success returns an upgraded connection handle that remains open together with the handshake response and client information. Rejected or malformed handshakes are written to the stream, the accepted streams are closed, and the predicate throws. **Compilation flags:** `static` **Template:** `serve_websocket_once(Listener,Handler,Connection,Response,ClientInfo)` **Mode and number of proofs:** `serve_websocket_once(+compound,+object_identifier,--compound,--compound,--compound)` - `one_or_error` **Exceptions:** `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The WebSocket opening request does not exist: `existence_error(http_socket_transport_websocket_request,end_of_file)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `serve_listener/4` Accepts and serves Count incoming connections on the given listener, returning the accepted client information terms in order. A `request_listener_shutdown/1` call for the listener may interrupt the bounded loop before Count connections are accepted. **Compilation flags:** `static` **Template:** `serve_listener(Listener,Handler,Count,ClientInfos)` **Mode and number of proofs:** `serve_listener(+compound,+object_identifier,+integer,--list(compound))` - `one_or_error` **Exceptions:** `Count` is a variable: `instantiation_error` `Count` is not a non-negative integer: `domain_error(non_negative_integer,Count)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` ------------------------------------------------------------------------ ###### `serve_listener/5` Accepts and serves `Count` incoming connections on the given listener using the specified shutdown and worker options. A `request_listener_shutdown/1` call for the listener may interrupt the bounded loop before `Count` connections are accepted. **Compilation flags:** `static` **Template:** `serve_listener(Listener,Handler,Count,ClientInfos,Options)` **Mode and number of proofs:** `serve_listener(+compound,+object_identifier,+integer,--list(compound),+list)` - `one_or_error` **Exceptions:** `Count` is a variable: `instantiation_error` `Count` is not a non-negative integer: `domain_error(non_negative_integer,Count)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid listener-serving option: `domain_error(http_socket_transport_listener_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` **Remarks:** > - Option `shutdown(keep_open)`: Leave the listener open after serving the requested number of connections. This is the default. > > - Option `shutdown(close)`: Close the listener when serving completes or aborts. > > - Option `workers(serial)`: Serve accepted connections sequentially in the caller thread. This is the default. > > - Option `workers(per_connection)`: Spawn one worker thread per accepted connection and wait for all workers before returning. Requires backend thread support. > > - Option `workers(pool(Size))`: Serve accepted connections in batches of up to `Size` worker threads, waiting for each batch to finish before accepting the next batch. Requires backend thread support. > > - Option `workers(pool(Size,`` ``rolling))`: Serve accepted connections using at most `Size` concurrent worker threads, accepting the next connection as soon as a worker finishes. Requires backend thread support. ------------------------------------------------------------------------ ###### `serve_until_shutdown/4` Accepts and serves incoming connections on the given listener until `request_shutdown/1` is called for the specified control term, then closes the listener before returning. **Compilation flags:** `static` **Template:** `serve_until_shutdown(Listener,Handler,Control,Options)` **Mode and number of proofs:** `serve_until_shutdown(+compound,+object_identifier,+nonvar,+list)` - `one_or_error` **Exceptions:** `Control` is a variable: `instantiation_error` `Control` is already registered for another open-ended listener loop: `permission_error(reuse,http_socket_transport_shutdown_control,Control)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` `Options` contains an invalid listener-serving option: `domain_error(http_socket_transport_listener_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` **Remarks:** > - Control term: The control term must be non-variable and should be fresh for each open-ended serving loop. > > - Option `workers(serial)`: Serve accepted connections sequentially in the caller thread. This is the default. > > - Option `workers(per_connection)`: Spawn one worker thread per accepted connection and wait for all workers when shutdown is requested. Requires backend thread support. > > - Option `workers(pool(Size))`: Serve accepted connections using at most Size concurrent worker threads, waiting for worker completion notifications before accepting additional connections. Requires backend thread support. > > - Option `workers(pool(Size,`` ``rolling))`: Alias for `workers(pool(Size))`. Requires backend thread support. > > - Shutdown behavior: Calling request_shutdown/1 wakes the serving loop, stops accepting new connections, and waits for active workers to finish before the listener is closed and the serving loop returns. ------------------------------------------------------------------------ ###### `serve_until_shutdown/5` Accepts and serves incoming connections on the given listener until `request_shutdown/1` is called for the specified control term, calling Ready after the shutdown control is registered and before the serving loop starts accepting connections. **Compilation flags:** `static` **Template:** `serve_until_shutdown(Listener,Handler,Control,Options,Ready)` **Meta-predicate template:** `serve_until_shutdown(*,*,*,*,0)` **Mode and number of proofs:** `serve_until_shutdown(+compound,+object_identifier,+nonvar,+list,+callable)` - `one_or_error` **Exceptions:** `Control` is a variable: `instantiation_error` `Control` is already registered for another open-ended listener loop: `permission_error(reuse,http_socket_transport_shutdown_control,Control)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` `Options` contains an invalid listener-serving option: `domain_error(http_socket_transport_listener_option,Option)` `Handler` does not conform to the HTTP handler protocol: `domain_error(http_handler_protocol,Handler)` The delegated HTTP server rejects the response stream: `domain_error(http_response_stream,Error)` Thread workers are not available on this backend: `resource_error(threads)` **Remarks:** > - Control term: The control term must be non-variable and should be fresh for each open-ended serving loop. > > - Ready goal: Called once after the shutdown control is registered and before the serving loop starts accepting connections. > > - Options: Supports the same worker options as `serve_until_shutdown/4`. ------------------------------------------------------------------------ ###### `request_shutdown/1` Requests shutdown of an open-ended serving loop started with `serve_until_shutdown/4` or `serve_until_shutdown/5` for the specified control term and wakes any blocked accept call so the loop can terminate portably. **Compilation flags:** `static` **Template:** `request_shutdown(Control)` **Mode and number of proofs:** `request_shutdown(+nonvar)` - `one_or_error` **Exceptions:** `Control` is a variable: `instantiation_error` `Control` is not registered for an open-ended listener loop: `existence_error(http_socket_transport_shutdown_control,Control)` Thread-backed shutdown is not available on this backend: `resource_error(threads)` ------------------------------------------------------------------------ ###### `supported_request_scheme/1` Table of supported request schemas. **Compilation flags:** `static` **Template:** `supported_request_scheme(Scheme)` **Mode and number of proofs:** `supported_request_scheme(+nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `supported_websocket_scheme/1` Table of supported websocket schemas. **Compilation flags:** `static` **Template:** `supported_websocket_scheme(Scheme)` **Mode and number of proofs:** `supported_websocket_scheme(+nonvar)` - `one_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### http_static_files") **object** #### `http_static_files` Router-agnostic static file response helper built on the normalized `http_core` library. **Availability:** `logtalk_load(http_static_files(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-14 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options `public` http_docroot_paths **Uses:** atom date http_core http_cors http_directory_listing list mime_types os user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `serve/4` - `serve/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `serve/4` Serves a relative request path from the given document root using the default options and returns a normalized response. **Compilation flags:** `static` **Template:** `serve(Path,Request,DocumentRoot,Response)` **Mode and number of proofs:** `serve(+atom,+compound,+atom,-compound)` - `one_or_error` **Exceptions:** `Path` is not a safe document-root relative path: `domain_error(http_docroot_relative_path,Path)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `DocumentRoot` is not a valid absolute document root path: `domain_error(http_docroot_document_root,DocumentRoot)` `DocumentRoot` is not an existing static-files document root: `domain_error(http_static_files_document_root,DocumentRoot)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ###### `serve/5` Serves a relative request path from the given document root using the given options and returns a normalized response. **Compilation flags:** `static` **Template:** `serve(Path,Request,DocumentRoot,Options,Response)` **Mode and number of proofs:** `serve(+atom,+compound,+atom,+list(compound),-compound)` - `one_or_error` **Exceptions:** `Path` is not a safe document-root relative path: `domain_error(http_docroot_relative_path,Path)` `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` `DocumentRoot` is not a valid absolute document root path: `domain_error(http_docroot_document_root,DocumentRoot)` `DocumentRoot` is not an existing static-files document root: `domain_error(http_static_files_document_root,DocumentRoot)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The generated response violates normalized HTTP response semantics: `domain_error(http_header_semantics,Header)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_websocket") **object** #### `http_websocket` High-level WebSocket predicates for opening and closing connections, exchanging messages, and running common client and server session loops. **Availability:** `logtalk_load(http_websocket(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** http_client http_core http_websocket_client_service(HTTPTransport) http_websocket_client_session http_websocket_messages http_websocket_server_service(HTTPTransport) http_websocket_server_session json list term_io url(Representation) **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `open/2` - `open/3` - `accept/3` - `accept/4` - `send/2` - `send/3` - `receive/2` - `receive/3` - `close/1` - `close/2` - `property/2` - `send_text/2` - `receive_text/2` - `send_binary/2` - `receive_binary/2` - `send_json/2` - `receive_json/2` - `send_term/2` - `receive_term/2` - `open_session/4` - `open_session/5` - `serve_once/5` - `serve_once/6` - Protected predicates - Private predicates - `handle_seed_/1` - `handle_state_/9` - Operators ##### Public predicates ###### `open/2` Opens a client WebSocket connection to the given `ws://` or `wss://` URL and returns an opaque handle managed by this object. **Compilation flags:** `static` **Template:** `open(URL,WebSocket)` **Mode and number of proofs:** `open(+atom,-compound)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute WebSocket URL: `domain_error(http_client_websocket_url,URL)` `URL` uses an unsupported WebSocket scheme: `domain_error(http_client_websocket_scheme,Scheme)` ------------------------------------------------------------------------ ###### `open/3` Opens a client WebSocket connection to the given URL, returning an opaque handle. Client handshake options are forwarded to `http_client::open_websocket/4`. The direct API also accepts `auto_pong(on|off)` and `max_payload_length(Bytes|none)` options. **Compilation flags:** `static` **Template:** `open(URL,WebSocket,Options)` **Mode and number of proofs:** `open(+atom,-compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute WebSocket URL: `domain_error(http_client_websocket_url,URL)` `URL` uses an unsupported WebSocket scheme: `domain_error(http_client_websocket_scheme,Scheme)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` `Options` contains an invalid direct WebSocket option: `domain_error(http_websocket_option,Option)` `Options` contains an invalid WebSocket client option: `domain_error(http_client_websocket_option,Option)` The WebSocket server response is not a valid opening handshake response: `domain_error(http_client_websocket_response,Response)` ------------------------------------------------------------------------ ###### `accept/3` Accepts one incoming WebSocket connection on the given listener using the default opening-handshake policy and returns an opaque server-side handle together with the accepted client information. **Compilation flags:** `static` **Template:** `accept(Listener,WebSocket,ClientInfo)` **Mode and number of proofs:** `accept(+compound,-compound,-compound)` - `one_or_error` **Exceptions:** The WebSocket opening request does not exist: `existence_error(http_socket_transport_websocket_request,Request)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` ------------------------------------------------------------------------ ###### `accept/4` Accepts one incoming WebSocket connection on the given listener and returns an opaque server-side handle. Server opening-handshake options are forwarded to `http_server_core::accept_websocket/3`. The direct API also accepts `auto_pong(on|off)` and `max_payload_length(Bytes|none)` options. **Compilation flags:** `static` **Template:** `accept(Listener,WebSocket,ClientInfo,Options)` **Mode and number of proofs:** `accept(+compound,-compound,-compound,+list)` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` `Options` contains an invalid direct WebSocket option: `domain_error(http_websocket_option,Option)` The WebSocket opening request does not exist: `existence_error(http_socket_transport_websocket_request,Request)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` ------------------------------------------------------------------------ ###### `send/2` Writes one outbound WebSocket message using the opaque handle. Accepts normalized `message(Type,`` ``Payload)` terms and the convenience wrappers `text(Text)`, `binary(Bytes)`, `ping(Bytes)`, `pong(Bytes)`, `close(Payload)`, `json(JSON)`, and `term(Term)`. **Compilation flags:** `static` **Template:** `send(WebSocket,Message)` **Mode and number of proofs:** `send(+compound,+term)` - `one_or_error` **Exceptions:** `WebSocket` is a variable: `instantiation_error` `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `WebSocket` refers to a closed opaque WebSocket handle: `existence_error(http_websocket_handle,WebSocket)` `Message` is not a valid outbound WebSocket message: `domain_error(http_websocket_message,Message)` ------------------------------------------------------------------------ ###### `send/3` Writes one outbound WebSocket message using the opaque handle and the given write options, forwarding those options to the underlying session `write_message/5` predicate. **Compilation flags:** `static` **Template:** `send(WebSocket,Message,Options)` **Mode and number of proofs:** `send(+compound,+term,+list)` - `one_or_error` **Exceptions:** `WebSocket` is a variable: `instantiation_error` `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `Message` is not a valid outbound WebSocket message: `domain_error(http_websocket_message,Message)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` `Options` contains an invalid write option: `domain_error(http_websocket_session_write_option,Option)` ------------------------------------------------------------------------ ###### `receive/2` Reads the next normalized WebSocket message using the opaque handle. Returns `end_of_file` when the peer closes the transport before another message is available. **Compilation flags:** `static` **Template:** `receive(WebSocket,Message)` **Mode and number of proofs:** `receive(+compound,-term)` - `one_or_error` **Exceptions:** `WebSocket` is a variable: `instantiation_error` `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `WebSocket` refers to a closed opaque WebSocket handle: `existence_error(http_websocket_handle,WebSocket)` The inbound WebSocket session sequence is invalid: `domain_error(http_websocket_session_sequence,Frame)` ------------------------------------------------------------------------ ###### `receive/3` Reads the next normalized WebSocket message using the opaque handle and the given read options. The direct API accepts per-call `auto_pong(on|off)` and `max_payload_length(Bytes|none)` overrides. **Compilation flags:** `static` **Template:** `receive(WebSocket,Message,Options)` **Mode and number of proofs:** `receive(+compound,-term,+list)` - `one_or_error` **Exceptions:** `WebSocket` is a variable: `instantiation_error` `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` `Options` contains an invalid direct WebSocket option: `domain_error(http_websocket_option,Option)` The inbound WebSocket session sequence is invalid: `domain_error(http_websocket_session_sequence,Frame)` ------------------------------------------------------------------------ ###### `close/1` Best-effort graceful close of the WebSocket handle using the normal close payload `empty`. **Compilation flags:** `static` **Template:** `close(WebSocket)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` **Exceptions:** `WebSocket` is a variable: `instantiation_error` `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `WebSocket` refers to a closed opaque WebSocket handle: `existence_error(http_websocket_handle,WebSocket)` ------------------------------------------------------------------------ ###### `close/2` Best-effort graceful close of the WebSocket handle using the given close payload, which must be valid for a normalized `message(close,`` ``Payload)` term. **Compilation flags:** `static` **Template:** `close(WebSocket,Payload)` **Mode and number of proofs:** `close(+compound,+term)` - `one_or_error` **Exceptions:** `WebSocket` is a variable: `instantiation_error` `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `Payload` is not a valid close payload: `domain_error(http_websocket_close_payload,Payload)` ------------------------------------------------------------------------ ###### `property/2` Enumerates properties of an open opaque WebSocket handle. Supported properties are `role(Role)`, `transport(Transport)`, `response(Response)`, `connection(Connection)`, `state(State)`, `client_info(ClientInfo)`, and `subprotocol(Protocol)`. **Compilation flags:** `static` **Template:** `property(WebSocket,Property)` **Mode and number of proofs:** `property(+compound,+compound)` - `zero_or_one` `property(+compound,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `send_text/2` Convenience wrapper for sending one text message. **Compilation flags:** `static` **Template:** `send_text(WebSocket,Text)` **Mode and number of proofs:** `send_text(+compound,+atom)` - `one_or_error` **Exceptions:** `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `Text` is not a valid text payload: `domain_error(http_websocket_message_text,Text)` ------------------------------------------------------------------------ ###### `receive_text/2` Reads the next message and returns its text payload when the message type is `text`. Returns `end_of_file` unchanged. **Compilation flags:** `static` **Template:** `receive_text(WebSocket,Text)` **Mode and number of proofs:** `receive_text(+compound,-term)` - `one_or_error` **Exceptions:** `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` The received message is not a text message: `domain_error(http_websocket_text_message,Message)` ------------------------------------------------------------------------ ###### `send_binary/2` Convenience wrapper for sending one binary message. **Compilation flags:** `static` **Template:** `send_binary(WebSocket,Bytes)` **Mode and number of proofs:** `send_binary(+compound,+list(byte))` - `one_or_error` **Exceptions:** `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `Bytes` is not a valid binary payload: `domain_error(http_websocket_message,Message)` ------------------------------------------------------------------------ ###### `receive_binary/2` Reads the next message and returns its binary payload when the message type is `binary`. Returns `end_of_file` unchanged. **Compilation flags:** `static` **Template:** `receive_binary(WebSocket,Bytes)` **Mode and number of proofs:** `receive_binary(+compound,-term)` - `one_or_error` **Exceptions:** `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` The received message is not a binary message: `domain_error(http_websocket_binary_message,Message)` ------------------------------------------------------------------------ ###### `send_json/2` Serializes a JSON term as UTF-8 text and sends it as one text message. Uses curly terms for parsed JSON objects, dashes for parsed JSON pairs, and atoms for parsed JSON strings. **Compilation flags:** `static` **Template:** `send_json(WebSocket,JSON)` **Mode and number of proofs:** `send_json(+compound,+nonvar)` - `one_or_error` **Exceptions:** `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `JSON` cannot be serialized as a text WebSocket message: `domain_error(json_sink,JSON)` ------------------------------------------------------------------------ ###### `receive_json/2` Reads the next text message and decodes its payload as JSON. Returns `end_of_file` unchanged. Uses curly terms for parsed JSON objects, dashes for parsed JSON pairs, and atoms for parsed JSON strings. **Compilation flags:** `static` **Template:** `receive_json(WebSocket,JSON)` **Mode and number of proofs:** `receive_json(+compound,-term)` - `one_or_error` **Exceptions:** `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` The received text payload is not valid JSON: `domain_error(http_websocket_json_text,Text)` ------------------------------------------------------------------------ ###### `send_term/2` Serializes a Prolog term using canonical write options and sends it as one text message. **Compilation flags:** `static` **Template:** `send_term(WebSocket,Term)` **Mode and number of proofs:** `send_term(+compound,+term)` - `one_or_error` **Exceptions:** `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` `Term` cannot be serialized as a text WebSocket message: `domain_error(http_websocket_term_text,Text)` ------------------------------------------------------------------------ ###### `receive_term/2` Reads the next text message and parses its payload as one Prolog term. Returns `end_of_file` unchanged. **Compilation flags:** `static` **Template:** `receive_term(WebSocket,Term)` **Mode and number of proofs:** `receive_term(+compound,-term)` - `one_or_error` **Exceptions:** `WebSocket` is not an open opaque WebSocket handle: `domain_error(http_websocket_handle,WebSocket)` The received text payload is not a canonical Prolog term: `domain_error(http_websocket_term_text,Text)` ------------------------------------------------------------------------ ###### `open_session/4` Convenience wrapper over `http_websocket_client_service::open/4` that keeps the user in the high-level `http_websocket` surface for callback-driven client sessions. **Compilation flags:** `static` **Template:** `open_session(URL,Handler,Response,State)` **Mode and number of proofs:** `open_session(+atom,+object_identifier,-compound,-compound)` - `one_or_error` **Exceptions:** `URL` is not a supported absolute WebSocket URL: `domain_error(http_client_websocket_url,URL)` `Handler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` ------------------------------------------------------------------------ ###### `open_session/5` Convenience wrapper over `http_websocket_client_service::open/5`. **Compilation flags:** `static` **Template:** `open_session(URL,Handler,Response,State,Options)` **Mode and number of proofs:** `open_session(+atom,+object_identifier,-compound,-compound,+list)` - `one_or_error` **Exceptions:** `URL` is not a supported absolute WebSocket URL: `domain_error(http_client_websocket_url,URL)` `Handler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` `Options` contains an invalid WebSocket client service option: `domain_error(http_websocket_client_service_option,Option)` `Options` contains an invalid WebSocket service loop option: `domain_error(http_websocket_service_option,Option)` ------------------------------------------------------------------------ ###### `serve_once/5` Convenience wrapper that accepts one incoming WebSocket connection on the given listener, performs the opening handshake using the default server policy, and runs one callback-driven server session. **Compilation flags:** `static` **Template:** `serve_once(Listener,Handler,Response,State,ClientInfo)` **Mode and number of proofs:** `serve_once(+compound,+object_identifier,-compound,-compound,-compound)` - `one_or_error` **Exceptions:** `Handler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` The WebSocket opening request does not exist: `existence_error(http_socket_transport_websocket_request,Request)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` ------------------------------------------------------------------------ ###### `serve_once/6` Convenience wrapper that accepts one incoming WebSocket connection on the given listener and runs one callback-driven server session using the given combined handshake and session options. **Compilation flags:** `static` **Template:** `serve_once(Listener,Handler,Response,State,ClientInfo,Options)` **Mode and number of proofs:** `serve_once(+compound,+object_identifier,-compound,-compound,-compound,+list)` - `one_or_error` **Exceptions:** `Handler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` `Options` contains an invalid WebSocket service loop option: `domain_error(http_websocket_service_option,Option)` The WebSocket opening request does not exist: `existence_error(http_socket_transport_websocket_request,Request)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `handle_seed_/1` Last allocated opaque WebSocket handle identifier. **Compilation flags:** `dynamic` **Template:** `handle_seed_(HandleId)` **Mode and number of proofs:** `handle_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `handle_state_/9` Stored opaque WebSocket handle state. **Compilation flags:** `dynamic` **Template:** `handle_state_(HandleId,Role,Transport,Connection,Response,ClientInfo,State,AutoPong,MaxPayloadLength)` **Mode and number of proofs:** `handle_state_(?positive_integer,?atom,?object_identifier,?compound,?compound,?term,?compound,?atom,?term)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `http_websocket_accept_handler(Options)` Internal opening-handshake adapter used by the high-level http_websocket server predicates. **Availability:** `logtalk_load(http_websocket(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_handler_protocol **Uses:** http_server_core **Remarks:** (none) **Inherited public predicates:**  handle/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_websocket_frames") **object** #### `http_websocket_frames` Transport-neutral WebSocket frame predicates for constructing, parsing, generating, reading, and writing normalized frame terms. **Availability:** `logtalk_load(http_websocket_frames(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** list reader **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `frame/5` - `is_frame/1` - `parse/2` - `generate/2` - `read_frame/2` - `read_frame/3` - `write_frame/2` - `final/2` - `opcode/2` - `payload/2` - `properties/2` - `property/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `frame/5` Constructs a validated normalized WebSocket frame term from the fragmentation state atom, opcode atom, payload bytes, and frame properties. **Compilation flags:** `static` **Template:** `frame(Final,Opcode,Payload,Properties,Frame)` **Mode and number of proofs:** `frame(+atom,+atom,+list(byte),+list(compound),-compound)` - `one_or_error` **Exceptions:** `Final` is not a valid WebSocket final flag: `domain_error(http_websocket_final,Final)` `Opcode` is not a valid WebSocket opcode: `domain_error(http_websocket_opcode,Opcode)` `Payload` is a variable or a partial list: `instantiation_error` `Payload` is not a valid WebSocket payload byte list: `domain_error(http_websocket_payload,Payload)` `Properties` is a variable or a partial list: `instantiation_error` `Properties` is not a valid WebSocket frame property list: `domain_error(http_websocket_properties,Properties)` A frame property is invalid: `domain_error(http_websocket_property,Property)` A masking key is invalid: `domain_error(http_websocket_masking_key,Key)` Reserved bits are invalid: `domain_error(http_websocket_reserved_bits,Bits)` The frame violates WebSocket frame semantics: `domain_error(http_websocket_frame,Frame)` **Remarks:** > - Final atoms: Use `final` for FIN=1 and `more` for FIN=0. > > - Opcode atoms: Supported opcodes are `continuation`, `text`, `binary`, `close`, `ping`, and `pong`. > > - Property `masking_key(Key)`: Requests masking on the wire using a list of four mask bytes. > > - Property `reserved_bits(Bits)`: Preserves reserved bits as an ordered list containing any of `rsv1`, `rsv2`, and `rsv3`. ------------------------------------------------------------------------ ###### `is_frame/1` True when the argument is a valid normalized WebSocket frame term. **Compilation flags:** `static` **Template:** `is_frame(Frame)` **Mode and number of proofs:** `is_frame(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse/2` Parses one WebSocket frame from a source term. Supported sources are `bytes(Bytes)`, `codes(Bytes)`, `file(File)`, and `stream(Stream)`. Empty sources return `end_of_file`. **Compilation flags:** `static` **Template:** `parse(Source,Frame)` **Mode and number of proofs:** `parse(++compound,-term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid WebSocket frame source term: `domain_error(http_websocket_source,Source)` The source bytes are not a valid WebSocket byte sequence: `domain_error(http_websocket_byte_sequence,Bytes)` The source bytes contain an invalid WebSocket opcode: `domain_error(http_websocket_opcode,Opcode)` The source bytes contain an invalid WebSocket frame length: `domain_error(http_websocket_frame_length,PayloadLength)` The source bytes do not encode a valid normalized WebSocket frame: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `generate/2` Generates one validated WebSocket frame to a sink term. Supported sinks are `bytes(Bytes)`, `codes(Bytes)`, `file(File)`, and `stream(Stream)`. **Compilation flags:** `static` **Template:** `generate(Sink,Frame)` **Mode and number of proofs:** `generate(++compound,+compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid WebSocket frame sink term: `domain_error(http_websocket_sink,Sink)` `Frame` is not a valid normalized WebSocket frame term: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `read_frame/2` Reads one WebSocket frame from a binary stream without requiring end-of-file. Returns `end_of_file` when the stream is already exhausted. **Compilation flags:** `static` **Template:** `read_frame(Stream,Frame)` **Mode and number of proofs:** `read_frame(+stream_or_alias,-term)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` The inbound bytes are not a valid WebSocket byte sequence: `domain_error(http_websocket_byte_sequence,Bytes)` The inbound payload length exceeds the configured limit: `domain_error(http_websocket_payload_length_limit,PayloadLength)` The inbound bytes do not encode a valid normalized WebSocket frame: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `read_frame/3` Reads one WebSocket frame from a binary stream using the given read options. Returns `end_of_file` when the stream is already exhausted. **Compilation flags:** `static` **Template:** `read_frame(Stream,Frame,Options)` **Mode and number of proofs:** `read_frame(+stream_or_alias,-term,+list)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The inbound payload length exceeds the configured limit: `domain_error(http_websocket_payload_length_limit,PayloadLength)` The inbound bytes are not a valid WebSocket byte sequence: `domain_error(http_websocket_byte_sequence,Bytes)` The inbound bytes do not encode a valid normalized WebSocket frame: `domain_error(http_websocket_frame,Frame)` **Remarks:** > - Repeated options: When the same read option is given multiple times, the first occurrence is used. > > - Option `max_payload_length(Bytes)`: Rejects frames whose declared payload length is greater than `Bytes` before allocating payload storage. Use a non-negative integer. ------------------------------------------------------------------------ ###### `write_frame/2` Writes one validated WebSocket frame to a binary stream and flushes the stream. **Compilation flags:** `static` **Template:** `write_frame(Stream,Frame)` **Mode and number of proofs:** `write_frame(+stream_or_alias,+compound)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` `Frame` is not a valid normalized WebSocket frame term: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `final/2` Returns the fragmentation state atom of a validated WebSocket frame term. **Compilation flags:** `static` **Template:** `final(Frame,Final)` **Mode and number of proofs:** `final(+compound,-atom)` - `one_or_error` **Exceptions:** `Frame` is not a valid normalized WebSocket frame term: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `opcode/2` Returns the opcode atom of a validated WebSocket frame term. **Compilation flags:** `static` **Template:** `opcode(Frame,Opcode)` **Mode and number of proofs:** `opcode(+compound,-atom)` - `one_or_error` **Exceptions:** `Frame` is not a valid normalized WebSocket frame term: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `payload/2` Returns the payload byte list of a validated WebSocket frame term. **Compilation flags:** `static` **Template:** `payload(Frame,Payload)` **Mode and number of proofs:** `payload(+compound,-list(byte))` - `one_or_error` **Exceptions:** `Frame` is not a valid normalized WebSocket frame term: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `properties/2` Returns the normalized property list of a validated WebSocket frame term. **Compilation flags:** `static` **Template:** `properties(Frame,Properties)` **Mode and number of proofs:** `properties(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Frame` is not a valid normalized WebSocket frame term: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `property/2` True when the validated WebSocket frame term contains the given property. When the property argument is a variable, properties can be enumerated on backtracking. **Compilation flags:** `static` **Template:** `property(Frame,Property)` **Mode and number of proofs:** `property(+compound,?compound)` - `zero_or_one_or_error` **Exceptions:** `Frame` is not a valid normalized WebSocket frame term: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_websocket_handshake") **object** #### `http_websocket_handshake` Shared helpers for WebSocket opening-handshake key generation and accept-value computation. **Availability:** `logtalk_load(http_websocket_handshake(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-11 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** base64 crypto hash_common_32 list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `websocket_opening_key/1` - `websocket_accept/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `websocket_opening_key/1` Generates a canonical base64-encoded 16-byte WebSocket opening key. **Compilation flags:** `static` **Template:** `websocket_opening_key(Key)` **Mode and number of proofs:** `websocket_opening_key(--atom)` - `one` ------------------------------------------------------------------------ ###### `websocket_accept/2` Computes the canonical Sec-WebSocket-Accept value for a valid WebSocket opening key. **Compilation flags:** `static` **Template:** `websocket_accept(Key,Accept)` **Mode and number of proofs:** `websocket_accept(++term,--atom)` - `one_or_error` **Exceptions:** `Key` is a variable: `instantiation_error` `Key` is not a valid WebSocket opening key value: `domain_error(http_websocket_key,Key)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_websocket_messages") **object** #### `http_websocket_messages` Transport-neutral WebSocket message predicates using atoms for text messages and close reasons. **Availability:** `logtalk_load(http_websocket_messages(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_websocket_messages(atom) **Remarks:** (none) **Inherited public predicates:**  is_message/1  message/3  payload/2  read_message/2  type/2  write_message/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_messages(TextRepresentation)` - `TextRepresentation` - Text representation to be used for text messages and close reasons. Possible values are `atom` (default), `chars`, and `codes`. Transport-neutral WebSocket message predicates built on top of the http_websocket frame layer. **Availability:** `logtalk_load(http_websocket_messages(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** http_websocket_frames list utf_8 **Remarks:** > - Fragmentation model: This layer reassembles fragmented text and binary messages only when all continuation frames arrive contiguously. Interleaved control frames during fragmented messages raise `http_websocket_message_sequence`. Use `http_websocket_session` for RFC 6455 live-stream processing that must surface interleaved control frames while reassembling data messages. **Inherited public predicates:** (none) - Public predicates - `message/3` - `is_message/1` - `read_message/2` - `write_message/2` - `type/2` - `payload/2` - Protected predicates - `encode_message/4` - `decode_message/3` - Private predicates - Operators ##### Public predicates ###### `message/3` Constructs a validated normalized WebSocket message term from the message type atom and payload term. **Compilation flags:** `static` **Template:** `message(Type,Payload,Message)` **Mode and number of proofs:** `message(+atom,+term,-compound)` - `one_or_error` **Exceptions:** `Type` is not a supported WebSocket message type: `domain_error(http_websocket_message_type,Type)` `Payload` is not valid for the requested WebSocket message type: `domain_error(http_websocket_message,Message)` `Payload` is not a valid WebSocket close payload: `domain_error(http_websocket_close_payload,Payload)` `Payload` contains an invalid WebSocket close code: `domain_error(http_websocket_close_code,Code)` `Payload` is not valid text for the selected text representation: `domain_error(http_websocket_message_text,Text)` **Remarks:** > - Type `text`: Payload is text in the selected text representation. > > - Type `binary`: Payload is a list of bytes. > > - Type `ping` or `pong`: Payload is a list of bytes. > > - Type `close`: Payload is one of `empty`, `status(Code)`, or `status(Code,`` ``Reason)`. ------------------------------------------------------------------------ ###### `is_message/1` True when the argument is a valid normalized WebSocket message term. **Compilation flags:** `static` **Template:** `is_message(Message)` **Mode and number of proofs:** `is_message(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `read_message/2` Reads one WebSocket message from a binary stream. Continuation frames are reassembled for text and binary messages when they arrive contiguously. Returns `end_of_file` when the stream is already exhausted. **Compilation flags:** `static` **Template:** `read_message(Stream,Message)` **Mode and number of proofs:** `read_message(+stream_or_alias,-term)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` The inbound frames do not form a valid normalized WebSocket message sequence: `domain_error(http_websocket_message_sequence,Frame)` The inbound frame is invalid: `domain_error(http_websocket_frame,Frame)` The inbound message payload is invalid: `domain_error(http_websocket_message,Message)` The inbound message text is invalid for the selected text representation: `domain_error(http_websocket_message_text,Text)` **Remarks:** > - Interleaved control frames: Control frames interleaved in the middle of a fragmented data message are not surfaced by this simplified layer and instead raise `http_websocket_message_sequence`. Use `http_websocket_session` when interleaved control frames must be handled while a fragmented message is in progress. ------------------------------------------------------------------------ ###### `write_message/2` Writes one validated WebSocket message as a single final frame to a binary stream and flushes the stream. **Compilation flags:** `static` **Template:** `write_message(Stream,Message)` **Mode and number of proofs:** `write_message(+stream_or_alias,+compound)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` `Message` has an unsupported message type: `domain_error(http_websocket_message_type,Type)` `Message` has an invalid close payload: `domain_error(http_websocket_close_payload,Payload)` `Message` has invalid text for the selected text representation: `domain_error(http_websocket_message_text,Text)` ------------------------------------------------------------------------ ###### `type/2` Returns the type atom of a validated WebSocket message term. **Compilation flags:** `static` **Template:** `type(Message,Type)` **Mode and number of proofs:** `type(+compound,-atom)` - `one_or_error` **Exceptions:** `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` `Message` has an unsupported message type: `domain_error(http_websocket_message_type,Type)` ------------------------------------------------------------------------ ###### `payload/2` Returns the payload term of a validated WebSocket message term. **Compilation flags:** `static` **Template:** `payload(Message,Payload)` **Mode and number of proofs:** `payload(+compound,-term)` - `one_or_error` **Exceptions:** `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` `Message` has an unsupported message type: `domain_error(http_websocket_message_type,Type)` ------------------------------------------------------------------------ ##### Protected predicates ###### `encode_message/4` Protected helper that normalizes a WebSocket message term and returns the normalized term together with the corresponding frame opcode and payload bytes. **Compilation flags:** `static` **Template:** `encode_message(Message,NormalizedMessage,Opcode,PayloadBytes)` **Mode and number of proofs:** `encode_message(+compound,-compound,-atom,-list(byte))` - `one_or_error` **Exceptions:** `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` `Message` has an unsupported message type: `domain_error(http_websocket_message_type,Type)` `Message` has an invalid close payload: `domain_error(http_websocket_close_payload,Payload)` `Message` has invalid text for the selected text representation: `domain_error(http_websocket_message_text,Text)` ------------------------------------------------------------------------ ###### `decode_message/3` Protected helper that decodes payload bytes for the given message type atom into a normalized WebSocket message term. **Compilation flags:** `static` **Template:** `decode_message(Type,PayloadBytes,Message)` **Mode and number of proofs:** `decode_message(+atom,+list(byte),-compound)` - `one_or_error` **Exceptions:** `Type` is not a supported WebSocket message type: `domain_error(http_websocket_message_type,Type)` `PayloadBytes` is not a valid close payload: `domain_error(http_websocket_close_payload,PayloadBytes)` `PayloadBytes` contains an invalid close code: `domain_error(http_websocket_close_code,Code)` `PayloadBytes` does not decode to valid text for the selected text representation: `domain_error(http_websocket_message_text,PayloadBytes)` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### http_websocket_service") **object** #### `http_websocket_client_service` By default, the client-side convenience for callback-driven WebSocket sessions with atom text representation, combining the opening handshake, optional initial outbound messages, and the higher-level session loop, uses the `http_socket_transport` library. **Availability:** `logtalk_load(http_websocket_service(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_websocket_service(http_socket_transport,client,atom) **Remarks:** (none) **Inherited public predicates:**  initial_state/1  is_message/1  is_state/1  message/3  payload/2  read_message/2  read_message/4  read_message/5  read_message/6  run_session/3  run_session/4  type/2  write_message/2  write_message/3  write_message/4  write_message/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_client_service(HTTPTransport)` Client-side convenience for callback-driven WebSocket sessions with atom text representation, combining the opening handshake, optional initial outbound messages, and the higher-level session loop. **Availability:** `logtalk_load(http_websocket_service(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_websocket_service(HTTPTransport,client,atom) **Uses:** http_client list user **Remarks:** (none) **Inherited public predicates:**  initial_state/1  is_message/1  is_state/1  message/3  payload/2  read_message/2  read_message/4  read_message/5  read_message/6  run_session/3  run_session/4  type/2  write_message/2  write_message/3  write_message/4  write_message/5 - Public predicates - `open/4` - `open/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `open/4` Builds a WebSocket opening handshake from the given absolute WebSocket URL supported by the selected transport parameterization, opens the upgraded connection, optionally writes initial outbound messages, then runs one callback-driven client session loop until the close handshake completes or the peer closes the stream. **Compilation flags:** `static` **Template:** `open(URL,Handler,Response,State)` **Mode and number of proofs:** `open(+atom,+object_identifier,-compound,-compound)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute WebSocket URL: `domain_error(http_client_websocket_url,URL)` `URL` uses an unsupported WebSocket scheme: `domain_error(http_client_websocket_scheme,Scheme)` The WebSocket server rejects the opening handshake version: `domain_error(http_client_websocket_version_rejection,Response)` The WebSocket server rejects authentication: `domain_error(http_client_websocket_authentication_rejection,Response)` The WebSocket server redirects the opening handshake: `domain_error(http_client_websocket_redirection_rejection,Response)` The WebSocket server rejects the opening handshake: `domain_error(http_client_websocket_rejection,Response)` The WebSocket server response is not a valid opening handshake response: `domain_error(http_client_websocket_response,Response)` `Handler` is a variable: `instantiation_error` `Handler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` The upgraded connection handle is invalid: `domain_error(http_socket_transport_connection,Connection)` The delegated session loop raises a WebSocket session error: `domain_error(http_websocket_session_sequence,Frame)` `Handler` returns an invalid reply: `domain_error(http_websocket_service_handler_reply,Reply)` ------------------------------------------------------------------------ ###### `open/5` Builds a WebSocket opening handshake from the given absolute WebSocket URL supported by the selected transport parameterization, opens the upgraded connection, optionally writes initial outbound messages, then runs one callback-driven client session loop using the given combined handshake and session options. **Compilation flags:** `static` **Template:** `open(URL,Handler,Response,State,Options)` **Mode and number of proofs:** `open(+atom,+object_identifier,-compound,-compound,+list)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not a supported absolute WebSocket URL: `domain_error(http_client_websocket_url,URL)` `URL` uses an unsupported WebSocket scheme: `domain_error(http_client_websocket_scheme,Scheme)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` `Options` contains an invalid initial message list: `type_error(list,Messages)` `Options` contains an invalid initial message: `domain_error(http_websocket_client_service_initial_message,Message)` `Options` contains an invalid automatic pong setting: `domain_error(http_websocket_client_service_option,auto_pong(Option))` `Options` contains an invalid client service option: `domain_error(http_websocket_client_service_option,Option)` `Options` contains an invalid WebSocket client option: `domain_error(http_client_websocket_option,Option)` `Options` contains an invalid WebSocket HTTP version: `domain_error(http_client_websocket_version,Version)` `Options` contains reserved WebSocket headers: `domain_error(http_client_websocket_headers,Headers)` `Options` contains an invalid WebSocket service loop option: `domain_error(http_websocket_service_option,Option)` Timed session-loop options are not available on this backend: `existence_error(http_websocket_service,timing)` The WebSocket server rejects the opening handshake version: `domain_error(http_client_websocket_version_rejection,Response)` The WebSocket server rejects authentication: `domain_error(http_client_websocket_authentication_rejection,Response)` The WebSocket server redirects the opening handshake: `domain_error(http_client_websocket_redirection_rejection,Response)` The WebSocket server rejects the opening handshake: `domain_error(http_client_websocket_rejection,Response)` The WebSocket server response is not a valid opening handshake response: `domain_error(http_client_websocket_response,Response)` `Handler` is a variable: `instantiation_error` `Handler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` The upgraded connection handle is invalid: `domain_error(http_socket_transport_connection,Connection)` The delegated session loop raises a WebSocket session error: `domain_error(http_websocket_session_sequence,Frame)` `Handler` returns an invalid reply: `domain_error(http_websocket_service_handler_reply,Reply)` **Remarks:** > - Repeated options: When the same handshake or session option is given multiple times, the first occurrence is used. > > - Handshake options: The headers/1, query/1, version/1, protocols/1, key/1, and connection_options/1 options are forwarded to open_websocket/4. The accepted URL schemes depend on the selected transport parameterization, e.g. ws:// for http_socket_transport and both ws:// and wss:// for http_process_transport. > > - Session option `auto_pong(on|off)`: Controls automatic pong replies during the session loop. > > - Session option `initial_messages(Messages)`: Writes the given list of normalized outbound messages before entering the session loop. > > - Session option `keepalive_interval(Seconds)`: Schedules empty ping messages when the peer stays silent for the given positive number of seconds. This option requires backend thread support. > > - Session option `idle_timeout(Seconds)`: Closes the session with `status(1001,`` ``idle_timeout)` after the given positive number of seconds without an inbound message. This option requires backend thread support. > > - Session option `max_payload_length(Bytes)`: Rejects inbound frames whose declared payload length is greater than `Bytes` before allocating payload storage. Oversized frames are treated as `1009` close errors in the session loop. Use a non-negative integer. ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_server_service` By default, the server-side convenience for callback-driven WebSocket sessions with atom text representation, including registry-backed broadcast helpers, uses the `http_socket_transport` library. **Availability:** `logtalk_load(http_websocket_service(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_websocket_service(http_socket_transport,server,atom) **Remarks:** (none) **Inherited public predicates:**  initial_state/1  is_message/1  is_state/1  message/3  payload/2  read_message/2  read_message/4  read_message/5  read_message/6  run_session/3  run_session/4  type/2  write_message/2  write_message/3  write_message/4  write_message/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_server_service(HTTPTransport)` Server-side convenience for callback-driven WebSocket sessions with atom text representation, including registry-backed broadcast helpers. **Availability:** `logtalk_load(http_websocket_service(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls,`` ``threaded` **Extends:** `public` http_websocket_service(HTTPTransport,server,atom) **Uses:** http_websocket_service_registry user **Remarks:** (none) **Inherited public predicates:**  initial_state/1  is_message/1  is_state/1  message/3  payload/2  read_message/2  read_message/4  read_message/5  read_message/6  run_session/3  run_session/4  type/2  write_message/2  write_message/3  write_message/4  write_message/5 - Public predicates - `serve_once/6` - `serve_once/7` - `serve_until_shutdown/5` - `serve_until_shutdown/6` - `request_shutdown/1` - Protected predicates - Private predicates - `shutdown_seed_/1` - `shutdown_control_/3` - `shutdown_requested_/2` - `active_worker_/3` - Operators ##### Public predicates ###### `serve_once/6` Accepts one incoming socket connection on the given listener created by the selected transport parameterization, serves one WebSocket opening handshake using the given HTTP handler, then runs one callback-driven WebSocket session using the given session handler until the close handshake completes or the peer closes the stream. **Compilation flags:** `static` **Template:** `serve_once(Listener,HandshakeHandler,SessionHandler,Response,State,ClientInfo)` **Mode and number of proofs:** `serve_once(+compound,+object_identifier,+object_identifier,-compound,-compound,-compound)` - `one_or_error` **Exceptions:** The listener is invalid for the selected transport: `domain_error(http_socket_transport_listener,Listener)` The WebSocket opening request does not exist: `existence_error(http_socket_transport_websocket_request,end_of_file)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` `SessionHandler` is a variable: `instantiation_error` `SessionHandler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,SessionHandler)` The upgraded connection handle is invalid: `domain_error(http_socket_transport_connection,Connection)` The delegated session loop raises a WebSocket session error: `domain_error(http_websocket_session_sequence,Frame)` `SessionHandler` returns an invalid reply: `domain_error(http_websocket_service_handler_reply,Reply)` ------------------------------------------------------------------------ ###### `serve_once/7` Accepts one incoming socket connection on the given listener created by the selected transport parameterization, serves one WebSocket opening handshake using the given HTTP handler, then runs one callback-driven WebSocket session using the given session handler and the given session-loop options. **Compilation flags:** `static` **Template:** `serve_once(Listener,HandshakeHandler,SessionHandler,Response,State,ClientInfo,Options)` **Mode and number of proofs:** `serve_once(+compound,+object_identifier,+object_identifier,-compound,-compound,-compound,+list)` - `one_or_error` **Exceptions:** The listener is invalid for the selected transport: `domain_error(http_socket_transport_listener,Listener)` The WebSocket opening request does not exist: `existence_error(http_socket_transport_websocket_request,end_of_file)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` `SessionHandler` is a variable: `instantiation_error` `SessionHandler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,SessionHandler)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid WebSocket service loop option: `domain_error(http_websocket_service_option,Option)` Timed session-loop options are not available on this backend: `existence_error(http_websocket_service,timing)` The upgraded connection handle is invalid: `domain_error(http_socket_transport_connection,Connection)` The delegated session loop raises a WebSocket session error: `domain_error(http_websocket_session_sequence,Frame)` `SessionHandler` returns an invalid reply: `domain_error(http_websocket_service_handler_reply,Reply)` **Remarks:** > - Option `auto_pong(on)`: Automatically writes pong replies while still forwarding ping messages to the session handler. > > - Option `auto_pong(off)`: Disables automatic pong replies. This is the default. > > - Option `keepalive_interval(Seconds)`: Schedules empty ping messages when the peer stays silent for the given positive number of seconds. This option requires backend thread support. > > - Option `idle_timeout(Seconds)`: Closes the session with `status(1001,`` ``idle_timeout)` after the given positive number of seconds without an inbound message. This option requires backend thread support. > > - Option `max_payload_length(Bytes)`: Rejects inbound frames whose declared payload length is greater than `Bytes` before allocating payload storage. Oversized frames are treated as `1009` close errors in the session loop. Use a non-negative integer. ------------------------------------------------------------------------ ###### `serve_until_shutdown/5` Accepts WebSocket opening handshakes on the given listener created by the selected transport parameterization until request_shutdown/1 is called for the specified control term, runs one callback-driven session loop per accepted upgraded connection, registers active sessions in the given registry for queued broadcasts, and closes the listener before returning. **Compilation flags:** `static` **Template:** `serve_until_shutdown(Listener,HandshakeHandler,SessionHandler,Registry,Control)` **Mode and number of proofs:** `serve_until_shutdown(+compound,+object_identifier,+object_identifier,+compound,+nonvar)` - `one_or_error` **Exceptions:** Registry-backed serving is not available on this backend: `existence_error(http_websocket_server_service,registry)` `Registry` is not an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Registry` refers to a closed WebSocket service registry handle: `existence_error(http_websocket_service_registry,session_registry(RegistryId))` `Control` is a variable: `instantiation_error` `Control` is already registered for another open-ended WebSocket server loop: `permission_error(reuse,http_websocket_service_shutdown_control,Control)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` `SessionHandler` is a variable: `instantiation_error` `SessionHandler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,SessionHandler)` The delegated session loop raises a WebSocket session error: `domain_error(http_websocket_session_sequence,Frame)` `SessionHandler` returns an invalid registry action: `domain_error(http_websocket_service_handler_action,Action)` **Remarks:** > - Thread support: This helper requires backend thread support so that multiple sessions can stay active concurrently. > > - Handler actions: Plain normalized messages are written back to the originating session. `broadcast(Message)` queues `Message` for all registered sessions and `broadcast_others(Message)` queues it for all registered sessions except the originating one. ------------------------------------------------------------------------ ###### `serve_until_shutdown/6` Accepts WebSocket opening handshakes on the given listener created by the selected transport parameterization until request_shutdown/1 is called for the specified control term, runs one registry-backed callback session per accepted connection, applies the given session-loop options to every active session, and closes the listener before returning. **Compilation flags:** `static` **Template:** `serve_until_shutdown(Listener,HandshakeHandler,SessionHandler,Registry,Control,Options)` **Mode and number of proofs:** `serve_until_shutdown(+compound,+object_identifier,+object_identifier,+compound,+nonvar,+list)` - `one_or_error` **Exceptions:** Registry-backed serving is not available on this backend: `existence_error(http_websocket_server_service,registry)` `Registry` is not an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Registry` refers to a closed WebSocket service registry handle: `existence_error(http_websocket_service_registry,session_registry(RegistryId))` `Control` is a variable: `instantiation_error` `Control` is already registered for another open-ended WebSocket server loop: `permission_error(reuse,http_websocket_service_shutdown_control,Control)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` `Options` contains an invalid WebSocket service loop option: `domain_error(http_websocket_service_option,Option)` Timed session-loop options are not available on this backend: `existence_error(http_websocket_service,timing)` The WebSocket opening response is invalid: `domain_error(http_socket_transport_websocket_response,Response)` `SessionHandler` is a variable: `instantiation_error` `SessionHandler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,SessionHandler)` The delegated session loop raises a WebSocket session error: `domain_error(http_websocket_session_sequence,Frame)` `SessionHandler` returns an invalid registry action: `domain_error(http_websocket_service_handler_action,Action)` **Remarks:** > - Option `auto_pong(on|off)`: Controls automatic pong replies in each active session loop. > > - Option `keepalive_interval(Seconds)`: Schedules empty ping messages when a peer stays silent for the given positive number of seconds. > > - Option `idle_timeout(Seconds)`: Closes a session with `status(1001,`` ``idle_timeout)` after the given positive number of seconds without an inbound message. > > - Option `max_payload_length(Bytes)`: Rejects inbound frames whose declared payload length is greater than `Bytes` before allocating payload storage. Oversized frames are treated as `1009` close errors in each session loop. Use a non-negative integer. ------------------------------------------------------------------------ ###### `request_shutdown/1` Requests shutdown of a registry-backed server loop started with serve_until_shutdown/5-6 for the specified control term and wakes any blocked accept call so the loop can terminate portably. **Compilation flags:** `static` **Template:** `request_shutdown(Control)` **Mode and number of proofs:** `request_shutdown(+nonvar)` - `one_or_error` **Exceptions:** Registry-backed serving is not available on this backend: `existence_error(http_websocket_server_service,registry)` `Control` is a variable: `instantiation_error` `Control` is not registered for an open-ended WebSocket server loop: `existence_error(http_websocket_service_shutdown_control,Control)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `shutdown_seed_/1` Last allocated shutdown run identifier for open-ended WebSocket server loops. **Compilation flags:** `dynamic` **Template:** `shutdown_seed_(RunId)` **Mode and number of proofs:** `shutdown_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `shutdown_control_/3` Registered shutdown control terms and their associated listeners. **Compilation flags:** `dynamic` **Template:** `shutdown_control_(Control,Listener,RunId)` **Mode and number of proofs:** `shutdown_control_(?nonvar,?compound,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `shutdown_requested_/2` Recorded shutdown requests indexed by control term and run identifier. **Compilation flags:** `dynamic` **Template:** `shutdown_requested_(Control,RunId)` **Mode and number of proofs:** `shutdown_requested_(?nonvar,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `active_worker_/3` Active WebSocket session worker records indexed by control term and run identifier. **Compilation flags:** `dynamic` **Template:** `active_worker_(Control,RunId,Worker)` **Mode and number of proofs:** `active_worker_(?nonvar,?positive_integer,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `http_websocket_service(HTTPTransport,Role,TextRepresentation)` - `HTTPTransport` - The object implementing `http_transport_protocol`. - `Role` - Peer role for masking policy. Possible values are `client` and `server`. - `TextRepresentation` - Text representation to be used for text messages and close reasons. Possible values are `atom` (default), `chars`, and `codes`. Callback-driven WebSocket session loops over upgraded WebSocket connections provided by a selected `http_transport_protocol` implementation, including automatic close-handshake orchestration, optional auto-pong, keepalive, and idle-timeout policies. **Availability:** `logtalk_load(http_websocket_service(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls,`` ``threaded` **Extends:** `public` http_websocket_session(Role,TextRepresentation) **Uses:** http_websocket_service_loop_options http_websocket_service_registry list os user **Remarks:** > - Option precedence: When the same loop option is given multiple times, the first occurrence is used. > > - Timed policies: Keepalive and idle-timeout deadlines are tracked using wall-clock time, making the loop robust to scheduling jitter and slow reads. **Inherited public predicates:**  initial_state/1  is_message/1  is_state/1  message/3  payload/2  read_message/2  read_message/4  read_message/5  read_message/6  type/2  write_message/2  write_message/3  write_message/4  write_message/5 - Public predicates - `run_session/3` - `run_session/4` - Protected predicates - `run_session_connection/5` - `validate_non_negative_integer_option/4` - Private predicates - Operators ##### Public predicates ###### `run_session/3` Runs a higher-level session loop on an upgraded WebSocket connection produced by the selected transport parameterization until the close handshake completes or the peer closes the stream, then closes the upgraded connection automatically. **Compilation flags:** `static` **Template:** `run_session(Connection,Handler,State)` **Mode and number of proofs:** `run_session(+compound,+object_identifier,-compound)` - `one_or_error` **Exceptions:** `Connection` is a variable: `instantiation_error` `Connection` is not a valid upgraded WebSocket connection handle: `domain_error(http_socket_transport_connection,Connection)` `Handler` is a variable: `instantiation_error` `Handler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` The inbound frame/message sequence violates RFC 6455 session rules: `domain_error(http_websocket_session_sequence,Frame)` The inbound frame violates the current peer masking policy: `domain_error(http_websocket_session_masking,Frame)` The inbound frame uses unsupported extensions: `domain_error(http_websocket_session_extensions,Frame)` The inbound frame is invalid: `domain_error(http_websocket_frame,Frame)` The inbound message text is invalid: `domain_error(http_websocket_message_text,Payload)` `Handler` returns a variable reply list: `instantiation_error` `Handler` returns a non-list reply list: `type_error(list,Replies)` `Handler` returns an invalid reply: `domain_error(http_websocket_service_handler_reply,Reply)` **Remarks:** > - Handler protocol: The handler object must conform to the `http_websocket_service_handler_protocol` protocol and return a list of normalized reply messages for each received message. > > - Connection ownership: This predicate takes ownership of the upgraded connection and closes it before succeeding or rethrowing any exception. ------------------------------------------------------------------------ ###### `run_session/4` Runs a higher-level session loop on an upgraded WebSocket connection produced by the selected transport parameterization using the given loop options, then closes the upgraded connection automatically. **Compilation flags:** `static` **Template:** `run_session(Connection,Handler,State,Options)` **Mode and number of proofs:** `run_session(+compound,+object_identifier,-compound,+list)` - `one_or_error` **Exceptions:** `Connection` is a variable: `instantiation_error` `Connection` is not a valid upgraded WebSocket connection handle: `domain_error(http_socket_transport_connection,Connection)` `Handler` is a variable: `instantiation_error` `Handler` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid WebSocket service loop option: `domain_error(http_websocket_service_option,Option)` Timed session-loop options are not available on this backend: `existence_error(http_websocket_service,timing)` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` The inbound frame/message sequence violates RFC 6455 session rules: `domain_error(http_websocket_session_sequence,Frame)` The inbound frame violates the current peer masking policy: `domain_error(http_websocket_session_masking,Frame)` The inbound frame uses unsupported extensions: `domain_error(http_websocket_session_extensions,Frame)` The inbound frame is invalid: `domain_error(http_websocket_frame,Frame)` The inbound message text is invalid: `domain_error(http_websocket_message_text,Payload)` `Handler` returns a variable reply list: `instantiation_error` `Handler` returns a non-list reply list: `type_error(list,Replies)` `Handler` returns an invalid reply: `domain_error(http_websocket_service_handler_reply,Reply)` **Remarks:** > - Option `auto_pong(on)`: Automatically writes pong replies while still forwarding ping messages to the handler. > > - Option `auto_pong(off)`: Disables automatic pong replies. This is the default. > > - Option `keepalive_interval(Seconds)`: When no inbound message is received for the given positive number of seconds, writes an empty ping message and continues the loop. This option requires backend thread support. > > - Option `idle_timeout(Seconds)`: When no inbound message is received for the given positive number of seconds, writes `message(close,`` ``status(1001,`` ``idle_timeout))` and waits up to one additional idle-timeout interval for the peer to complete the close handshake before stopping. This option requires backend thread support. > > - Option `max_payload_length(Bytes)`: Rejects inbound frames whose declared payload length is greater than `Bytes` before allocating payload storage. Oversized frames are treated as `1009` close errors in the session loop. Use a non-negative integer. ------------------------------------------------------------------------ ##### Protected predicates ###### `run_session_connection/5` Protected helper that runs the callback-driven session loop on an upgraded WebSocket connection starting from the given session state and using the given loop options. Connection ownership is handled by the caller. **Compilation flags:** `static` **Template:** `run_session_connection(Connection,HandlerDescriptor,State,UpdatedState,Options)` **Mode and number of proofs:** `run_session_connection(+compound,+compound,+compound,-compound,+list)` - `one_or_error` **Exceptions:** `Connection` is a variable: `instantiation_error` `Connection` is not a valid upgraded WebSocket connection handle: `domain_error(http_socket_transport_connection,Connection)` `HandlerDescriptor` is not a valid WebSocket service handler descriptor: `domain_error(http_websocket_service_handler,HandlerDescriptor)` The handler in `HandlerDescriptor` is a variable: `instantiation_error` The handler in `HandlerDescriptor` is not a valid WebSocket service handler: `domain_error(http_websocket_service_handler,Handler)` `State` is a variable: `instantiation_error` `State` is not a valid WebSocket session state: `domain_error(http_websocket_session_state,State)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid WebSocket service loop option: `domain_error(http_websocket_service_option,Option)` Timed session-loop options are not available on this backend: `existence_error(http_websocket_service,timing)` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` The inbound frame/message sequence violates RFC 6455 session rules: `domain_error(http_websocket_session_sequence,Frame)` The inbound frame violates the current peer masking policy: `domain_error(http_websocket_session_masking,Frame)` The inbound frame uses unsupported extensions: `domain_error(http_websocket_session_extensions,Frame)` The inbound frame is invalid: `domain_error(http_websocket_frame,Frame)` The inbound message text is invalid: `domain_error(http_websocket_message_text,Payload)` The handler returns a variable reply or action list: `instantiation_error` The handler returns a non-list reply list: `type_error(list,Replies)` The handler returns a non-list action list: `type_error(list,Actions)` The handler returns an invalid reply: `domain_error(http_websocket_service_handler_reply,Reply)` The handler returns an invalid registry action: `domain_error(http_websocket_service_handler_action,Action)` The registry in `HandlerDescriptor` is not an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` The session in `HandlerDescriptor` is not a valid WebSocket service registry session handle: `domain_error(http_websocket_service_registry_session,Session)` The session in `HandlerDescriptor` is not registered in the registry: `existence_error(http_websocket_service_registry_session,websocket_session(RegistryId,SessionId))` ------------------------------------------------------------------------ ###### `validate_non_negative_integer_option/4` Validates a non-negative integer option value for the given domain and option name. **Compilation flags:** `static` **Template:** `validate_non_negative_integer_option(Domain,Name,Value,ValidatedValue)` **Mode and number of proofs:** `validate_non_negative_integer_option(+atom,+atom,@term,-integer)` - `one_or_error` **Exceptions:** `Value` is not a non-negative integer option value for the given domain and option name: `domain_error(Domain,Option)` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `http_websocket_service_handler_protocol` Protocol for callback objects used by the callback-driven WebSocket service loops. **Availability:** `logtalk_load(http_websocket_service(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `handle/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `handle/2` Processes a received normalized WebSocket message and returns a list of zero or more session actions. Plain normalized messages are written back on the same session before the next read. When used with the registry-backed server helper, the list may also contain the action wrappers `reply(Message)`, `broadcast(Message)`, and `broadcast_others(Message)`. **Compilation flags:** `static` **Template:** `handle(Message,Replies)` **Mode and number of proofs:** `handle(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` `Replies` is a variable: `instantiation_error` `Replies` is neither a variable nor a list: `type_error(list,Replies)` An element `Reply` of the list `Replies` is not a valid reply message: `domain_error(http_websocket_service_handler_reply,Reply)` An element `Reply` of the list `Replies` is not a valid registry-backed action: `domain_error(http_websocket_service_handler_action,Reply)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `http_websocket_service_loop_options` Auxiliary object defining the supported session-loop options and default values for callback-driven WebSocket services. **Availability:** `logtalk_load(http_websocket_service(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `merged_options/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `merged_options/2` Merges validated session-loop options with the declared default options. **Compilation flags:** `static` **Template:** `merged_options(UserOptions,MergedOptions)` **Mode and number of proofs:** `merged_options(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_service_registry` Session registry predicates for active WebSocket sessions and queued broadcast delivery. **Availability:** `logtalk_load(http_websocket_service(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** http_websocket_messages list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `open/1` - `close/1` - `register/2` - `unregister/2` - `session/2` - `sessions/2` - `session_count/2` - `send/3` - `broadcast/2` - `broadcast_except/3` - `take_pending/3` - Protected predicates - Private predicates - `registry_seed_/1` - `registry_state_/2` - `registry_session_/3` - Operators ##### Public predicates ###### `open/1` Opens a new empty WebSocket session registry. **Compilation flags:** `static` **Template:** `open(Registry)` **Mode and number of proofs:** `open(-compound)` - `one` ------------------------------------------------------------------------ ###### `close/1` Closes a session registry and removes all registered sessions and queued messages. **Compilation flags:** `static` **Template:** `close(Registry)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Registry` refers to a closed WebSocket service registry handle: `existence_error(http_websocket_service_registry,session_registry(RegistryId))` ------------------------------------------------------------------------ ###### `register/2` Registers a new active session in the given registry and returns its session identifier. **Compilation flags:** `static` **Template:** `register(Registry,Session)` **Mode and number of proofs:** `register(+compound,-compound)` - `one_or_error` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Registry` refers to a closed WebSocket service registry handle: `existence_error(http_websocket_service_registry,session_registry(RegistryId))` ------------------------------------------------------------------------ ###### `unregister/2` Removes a session from the given registry together with any queued outbound messages. **Compilation flags:** `static` **Template:** `unregister(Registry,Session)` **Mode and number of proofs:** `unregister(+compound,+compound)` - `one_or_error` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Registry` refers to a closed WebSocket service registry handle: `existence_error(http_websocket_service_registry,session_registry(RegistryId))` `Session` is a variable or is not a session for `Registry`: `instantiation_error` `Session` is not a valid WebSocket service registry session handle: `domain_error(http_websocket_service_registry_session,Session)` `Session` is not registered in `Registry`: `existence_error(http_websocket_service_registry_session,websocket_session(RegistryId,SessionId))` ------------------------------------------------------------------------ ###### `session/2` Enumerates active session identifiers registered in the given registry. **Compilation flags:** `static` **Template:** `session(Registry,Session)` **Mode and number of proofs:** `session(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `sessions/2` Returns the list of active session identifiers registered in the given registry. **Compilation flags:** `static` **Template:** `sessions(Registry,Sessions)` **Mode and number of proofs:** `sessions(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Registry` refers to a closed WebSocket service registry handle: `existence_error(http_websocket_service_registry,session_registry(RegistryId))` ------------------------------------------------------------------------ ###### `session_count/2` Returns the number of active sessions currently registered in the given registry. **Compilation flags:** `static` **Template:** `session_count(Registry,Count)` **Mode and number of proofs:** `session_count(+compound,-integer)` - `one_or_error` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Registry` refers to a closed WebSocket service registry handle: `existence_error(http_websocket_service_registry,session_registry(RegistryId))` ------------------------------------------------------------------------ ###### `send/3` Queues a normalized outbound message for the specified registered session. **Compilation flags:** `static` **Template:** `send(Registry,Session,Message)` **Mode and number of proofs:** `send(+compound,+compound,+compound)` - `one_or_error` **Exceptions:** `Registry` is not an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Session` is not a valid WebSocket service registry session handle: `domain_error(http_websocket_service_registry_session,Session)` `Session` is not registered in `Registry`: `existence_error(http_websocket_service_registry_session,websocket_session(RegistryId,SessionId))` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_service_registry_message,Message)` ------------------------------------------------------------------------ ###### `broadcast/2` Queues a normalized outbound message for all currently registered sessions. **Compilation flags:** `static` **Template:** `broadcast(Registry,Message)` **Mode and number of proofs:** `broadcast(+compound,+compound)` - `one_or_error` **Exceptions:** `Registry` is not an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_service_registry_message,Message)` ------------------------------------------------------------------------ ###### `broadcast_except/3` Queues a normalized outbound message for all currently registered sessions except the specified session. **Compilation flags:** `static` **Template:** `broadcast_except(Registry,Session,Message)` **Mode and number of proofs:** `broadcast_except(+compound,+compound,+compound)` - `one_or_error` **Exceptions:** `Registry` is not an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Session` is not a valid WebSocket service registry session handle: `domain_error(http_websocket_service_registry_session,Session)` `Session` is not registered in `Registry`: `existence_error(http_websocket_service_registry_session,websocket_session(RegistryId,SessionId))` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_service_registry_message,Message)` ------------------------------------------------------------------------ ###### `take_pending/3` Removes and returns the queued outbound messages for the specified registered session. **Compilation flags:** `static` **Template:** `take_pending(Registry,Session,Messages)` **Mode and number of proofs:** `take_pending(+compound,+compound,-list(compound))` - `one_or_error` **Exceptions:** `Registry` is not an open WebSocket service registry handle: `domain_error(http_websocket_service_registry,Registry)` `Session` is not a valid WebSocket service registry session handle: `domain_error(http_websocket_service_registry_session,Session)` `Session` is not registered in `Registry`: `existence_error(http_websocket_service_registry_session,websocket_session(RegistryId,SessionId))` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `registry_seed_/1` Last allocated registry identifier. **Compilation flags:** `dynamic` **Template:** `registry_seed_(RegistryId)` **Mode and number of proofs:** `registry_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `registry_state_/2` Per-registry next session identifier state. **Compilation flags:** `dynamic` **Template:** `registry_state_(RegistryId,NextSessionId)` **Mode and number of proofs:** `registry_state_(?positive_integer,?non_negative_integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `registry_session_/3` Registered sessions and their queued outbound messages indexed by registry identifier. Messages are stored in reverse order to make enqueue operations constant time. **Compilation flags:** `dynamic` **Template:** `registry_session_(RegistryId,SessionId,QueuedMessagesReversed)` **Mode and number of proofs:** `registry_session_(?positive_integer,?positive_integer,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### http_websocket_session") **object** #### `http_websocket_client_session` Stateful WebSocket session predicates for client-side use with atom text representation. **Availability:** `logtalk_load(http_websocket_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_websocket_session(client,atom) **Remarks:** (none) **Inherited public predicates:**  initial_state/1  is_message/1  is_state/1  message/3  payload/2  read_message/2  read_message/4  read_message/5  read_message/6  type/2  write_message/2  write_message/3  write_message/4  write_message/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_server_session` Stateful WebSocket session predicates for server-side use with atom text representation. **Availability:** `logtalk_load(http_websocket_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_websocket_session(server,atom) **Remarks:** (none) **Inherited public predicates:**  initial_state/1  is_message/1  is_state/1  message/3  payload/2  read_message/2  read_message/4  read_message/5  read_message/6  type/2  write_message/2  write_message/3  write_message/4  write_message/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_session(Role,TextRepresentation)` - `Role` - Peer role for masking policy. Possible values are `client` and `server`. - `TextRepresentation` - Text representation to be used for text messages and close reasons. Possible values are `atom` (default), `chars`, and `codes`. Stateful WebSocket session predicates that build on top of the message layer to surface interleaved control frames, apply role-aware masking policies, and track close-handshake state. The callback-driven session loops are provided by the http_websocket_service library. **Availability:** `logtalk_load(http_websocket_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` http_websocket_messages(TextRepresentation) **Uses:** crypto http_websocket_frames http_websocket_session_read_options http_websocket_session_write_options list **Remarks:** > - Option precedence: When the same read or write option is given multiple times, the first occurrence is used. **Inherited public predicates:**  is_message/1  message/3  payload/2  read_message/2  type/2 - Public predicates - `initial_state/1` - `is_state/1` - `read_message/4` - `read_message/5` - `read_message/6` - `write_message/2` - `write_message/3` - `write_message/4` - `write_message/5` - Protected predicates - `validate_role/0` - `read_session_message/5` - `apply_session_read/6` - `current_close_state/2` - `close_handshake_completed/1` - `best_effort_protocol_error_close/3` - `generate_masking_key/1` - Private predicates - Operators ##### Public predicates ###### `initial_state/1` Returns the initial session state term to be threaded through stateful reads. **Compilation flags:** `static` **Template:** `initial_state(State)` **Mode and number of proofs:** `initial_state(-compound)` - `one` ------------------------------------------------------------------------ ###### `is_state/1` True when the argument is a valid session state term. **Compilation flags:** `static` **Template:** `is_state(State)` **Mode and number of proofs:** `is_state(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `read_message/4` Reads the next session-level WebSocket message from a binary stream using the given input state. Fragmented text and binary messages are reassembled across calls, interleaved control frames are surfaced immediately, and close-message state transitions are tracked in the returned state. **Compilation flags:** `static` **Template:** `read_message(Stream,State,UpdatedState,Message)` **Mode and number of proofs:** `read_message(+stream_or_alias,+compound,-compound,-term)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` `State` is not a valid WebSocket session state: `domain_error(http_websocket_session_state,State)` The inbound frame/message sequence violates RFC 6455 session rules: `domain_error(http_websocket_session_sequence,Frame)` The inbound frame violates the current peer masking policy: `domain_error(http_websocket_session_masking,Frame)` The inbound frame uses unsupported extensions: `domain_error(http_websocket_session_extensions,Frame)` The inbound frame is invalid: `domain_error(http_websocket_frame,Frame)` The inbound message text is invalid: `domain_error(http_websocket_message_text,Payload)` **Remarks:** > - End of file: Returns `end_of_file` only when the input state is idle and the stream is already exhausted. > > - Masking policy: Incoming frame masking is validated against the session role: client sessions expect unmasked inbound frames and server sessions expect masked inbound frames. > > - Peer close: When a close frame is read, any fragmented data message in progress is discarded. Subsequent reads from the resulting `close_received/1` or `closed/2` state are rejected. ------------------------------------------------------------------------ ###### `read_message/5` Reads the next session-level WebSocket message from a binary input stream using the given state and automatically orchestrates the close handshake on the given binary output stream when a close message is received. **Compilation flags:** `static` **Template:** `read_message(Input,Output,State,UpdatedState,Message)` **Mode and number of proofs:** `read_message(+stream_or_alias,+stream_or_alias,+compound,-compound,-term)` - `one_or_error` **Exceptions:** `Input` is a variable: `instantiation_error` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` `State` is not a valid WebSocket session state: `domain_error(http_websocket_session_state,State)` The inbound frame/message sequence violates RFC 6455 session rules: `domain_error(http_websocket_session_sequence,Frame)` The inbound frame violates the current peer masking policy: `domain_error(http_websocket_session_masking,Frame)` The inbound frame uses unsupported extensions: `domain_error(http_websocket_session_extensions,Frame)` The inbound frame is invalid: `domain_error(http_websocket_frame,Frame)` The inbound message text is invalid: `domain_error(http_websocket_message_text,Payload)` **Remarks:** > - Close handshake: When a close message is received and no close message has yet been sent for the tracked session state, a matching close message is written automatically on the output stream and the returned state records the completed handshake. ------------------------------------------------------------------------ ###### `read_message/6` Reads the next session-level WebSocket message from a binary input stream using the given state, automatically orchestrates the close handshake on the given binary output stream, and applies optional automatic control-message policies. **Compilation flags:** `static` **Template:** `read_message(Input,Output,State,UpdatedState,Message,Options)` **Mode and number of proofs:** `read_message(+stream_or_alias,+stream_or_alias,+compound,-compound,-term,+list)` - `one_or_error` **Exceptions:** `Input` is a variable: `instantiation_error` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` `State` is not a valid WebSocket session state: `domain_error(http_websocket_session_state,State)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid read option: `domain_error(http_websocket_session_read_option,Option)` The inbound frame/message sequence violates RFC 6455 session rules: `domain_error(http_websocket_session_sequence,Frame)` The inbound frame violates the current peer masking policy: `domain_error(http_websocket_session_masking,Frame)` The inbound frame uses unsupported extensions: `domain_error(http_websocket_session_extensions,Frame)` The inbound payload length exceeds the configured limit: `domain_error(http_websocket_payload_length_limit,PayloadLength)` **Remarks:** > - Option `auto_pong(on)`: Automatically writes a pong message with the same payload when a ping message is read while still returning the ping message to the caller. > > - Option `auto_pong(off)`: Disables automatic pong replies. This is the default. > > - Option `max_payload_length(Bytes)`: Rejects inbound frames whose declared payload length is greater than `Bytes` before allocating payload storage. Use a non-negative integer. ------------------------------------------------------------------------ ###### `write_message/2` Stateless convenience wrapper that writes one validated WebSocket message using the masking policy implied by the session role. Client sessions mask all outgoing frames; server sessions leave them unmasked. **Compilation flags:** `static` **Template:** `write_message(Stream,Message)` **Mode and number of proofs:** `write_message(+stream_or_alias,+compound)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` `Message` contains invalid text: `domain_error(http_websocket_message_text,Text)` The generated outbound frame is invalid: `domain_error(http_websocket_frame,Frame)` ------------------------------------------------------------------------ ###### `write_message/3` Stateless convenience wrapper that writes one validated WebSocket message using the masking policy implied by the session role and the given write options. **Compilation flags:** `static` **Template:** `write_message(Stream,Message,Options)` **Mode and number of proofs:** `write_message(+stream_or_alias,+compound,+list)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid write option: `domain_error(http_websocket_session_write_option,Option)` The generated outbound frame is invalid: `domain_error(http_websocket_frame,Frame)` **Remarks:** > - Option `fragment_size(Size)`: When writing `text` or `binary` messages, split the payload into frames of at most `Size` bytes. Control messages always remain single final frames. ------------------------------------------------------------------------ ###### `write_message/4` Writes one validated WebSocket message using the masking policy implied by the session role and updates the given session state with any close-handshake transition caused by the write. **Compilation flags:** `static` **Template:** `write_message(Stream,State,UpdatedState,Message)` **Mode and number of proofs:** `write_message(+stream_or_alias,+compound,-compound,+compound)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` `State` is not a valid WebSocket session state: `domain_error(http_websocket_session_state,State)` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` The write violates the current close-handshake state: `domain_error(http_websocket_session_state,State)` **Remarks:** > - Closing state: After a peer close is recorded, only the matching close reply may be written. After a local close is recorded, further data messages are rejected. ------------------------------------------------------------------------ ###### `write_message/5` Writes one validated WebSocket message using the masking policy implied by the session role and the given write options while updating the given session state with any close-handshake transition caused by the write. **Compilation flags:** `static` **Template:** `write_message(Stream,State,UpdatedState,Message,Options)` **Mode and number of proofs:** `write_message(+stream_or_alias,+compound,-compound,+compound,+list)` - `one_or_error` **Exceptions:** `Stream` is a variable: `instantiation_error` The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` `State` is not a valid WebSocket session state: `domain_error(http_websocket_session_state,State)` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid write option: `domain_error(http_websocket_session_write_option,Option)` The write violates the current close-handshake state: `domain_error(http_websocket_session_state,State)` **Remarks:** > - Option `fragment_size(Size)`: When writing `text` or `binary` messages, split the payload into frames of at most `Size` bytes. Control messages always remain single final frames. ------------------------------------------------------------------------ ##### Protected predicates ###### `validate_role/0` Validates the session role parameter. Throws a domain error when the role is neither `client` nor `server`. **Compilation flags:** `static` **Mode and number of proofs:** `validate_role` - `one_or_error` **Exceptions:** The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` ------------------------------------------------------------------------ ###### `read_session_message/5` Protected helper that validates the session role and state and reads the next session-level message, returning the updated pending-fragment bookkeeping term and the message. Close-state transitions are left to the caller. **Compilation flags:** `static` **Template:** `read_session_message(Stream,State,MaxPayloadLength,Pending,Message)` **Mode and number of proofs:** `read_session_message(+stream_or_alias,+compound,+term,-compound,-term)` - `one_or_error` **Exceptions:** The session role parameter is neither `client` nor `server`: `domain_error(http_websocket_session_role,_Role_)` `State` is not a valid WebSocket session state: `domain_error(http_websocket_session_state,State)` The inbound frame/message sequence violates RFC 6455 session rules: `domain_error(http_websocket_session_sequence,Frame)` The inbound frame violates the current peer masking policy: `domain_error(http_websocket_session_masking,Frame)` The inbound frame uses unsupported extensions: `domain_error(http_websocket_session_extensions,Frame)` ------------------------------------------------------------------------ ###### `apply_session_read/6` Protected helper that applies the close-state and automatic control-message transitions for a message read outside this object and returns the updated session state. **Compilation flags:** `static` **Template:** `apply_session_read(Output,State,AutoPong,Pending,Message,UpdatedState)` **Mode and number of proofs:** `apply_session_read(+stream_or_alias,+compound,+atom,+compound,+term,-compound)` - `one_or_error` **Exceptions:** `State` is not a valid WebSocket session state: `domain_error(http_websocket_session_state,State)` `AutoPong` is not a supported automatic pong setting: `domain_error(http_websocket_session_read_option,auto_pong(AutoPong))` `Message` is not a valid normalized WebSocket message term: `domain_error(http_websocket_message,Message)` ------------------------------------------------------------------------ ###### `current_close_state/2` Protected helper that returns the close-handshake component of a session state term. Open states are reported as `open`. **Compilation flags:** `static` **Template:** `current_close_state(State,CloseState)` **Mode and number of proofs:** `current_close_state(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `close_handshake_completed/1` Protected helper that is true when the given session state records a completed close handshake. **Compilation flags:** `static` **Template:** `close_handshake_completed(State)` **Mode and number of proofs:** `close_handshake_completed(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `best_effort_protocol_error_close/3` Protected helper that writes a best-effort close message mapping the given protocol error to its close status code when the session close state still allows it. Write errors are ignored. **Compilation flags:** `static` **Template:** `best_effort_protocol_error_close(Output,State,Error)` **Mode and number of proofs:** `best_effort_protocol_error_close(+stream_or_alias,+compound,+callable)` - `one` ------------------------------------------------------------------------ ###### `generate_masking_key/1` Protected hook that returns the four-byte masking key to use for outgoing client frames. The default implementation delegates to `crypto::random_bytes/2`. **Compilation flags:** `static` **Template:** `generate_masking_key(Key)` **Mode and number of proofs:** `generate_masking_key(-list(byte))` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_session_read_options` Auxiliary object defining the supported read options and default values for HTTP WebSocket sessions. **Availability:** `logtalk_load(http_websocket_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `merged_options/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `merged_options/2` Merges validated read options with the declared default options. **Compilation flags:** `static` **Template:** `merged_options(UserOptions,MergedOptions)` **Mode and number of proofs:** `merged_options(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `http_websocket_session_write_options` Auxiliary object defining the supported write options and default values for HTTP WebSocket sessions. **Availability:** `logtalk_load(http_websocket_session(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `merged_options/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `merged_options/2` Merges validated write options with the declared default options. **Compilation flags:** `static` **Template:** `merged_options(UserOptions,MergedOptions)` **Mode and number of proofs:** `merged_options(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ica_projection") **object** #### `ica_projection` Independent Component Analysis reducer for continuous datasets using a portable FastICA-style solver with symmetric eigendecomposition whitening. **Availability:** `logtalk_load(ica_projection(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-23 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** format linear_algebra list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also nmf_projection, pca_projection, random_projection, truncated_svd_projection ### ids") **object** #### `ids` Generator of random identifiers represented as atoms with 160 bits (20 bytes) of randomness. **Availability:** `logtalk_load(ids(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` ids(atom,20) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ids(Representation,Bytes), cuid2, ksuid, nanoid, snowflakeid, uuid, ulid **object** #### `ids(Representation,Bytes)` - `Representation` - Text representation for the identifier. Possible values are `atom`, `chars`, and `codes`. - `Bytes` - Number of bytes of randomness. Generator of random identifiers. **Availability:** `logtalk_load(ids(loader))` **Author:** Paulo Moura **Version:** 1:1:1 **Date:** 2026-06-01 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** base64 crypto **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `generate/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `generate/1` Generate a random identifier. **Compilation flags:** `static` **Template:** `generate(Identifier)` **Mode and number of proofs:** `generate(--textids)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ids, nanoid(Representation,Size,Alphabet), cuid2(Representation,Size,Alphabet), ksuid(Representation,Alphabet), uuid(Representation), snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), ulid(Representation) ### ieee_754") **object** #### `ieee_754(Precision,ByteOrder,NaNRepresentation)` - `Precision` - Floating-point format precision. Supported values are `half`, `single`, and `double`. - `ByteOrder` - Byte order used when parsing and generating byte sequences. Supported values are `big` and `little`. - `NaNRepresentation` - NaN decoding and generation policy. Supported values are `canonical` and `payloads`. IEEE 754 floating-point encoder and decoder. **Availability:** `logtalk_load(ieee_754(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ieee_754_protocol **Imports:** `public` ieee_754_common(Precision,ByteOrder) **Uses:** type **Remarks:** (none) **Inherited public predicates:**  byte_count/1  exactly_representable/1  generate/2  generate/3  nan_representation/1  order/1  parse/2  precision/1  valid/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `ieee_754_common(Precision,ByteOrder)` Shared IEEE 754 exact bit and byte handling predicates for the high-level codec and low-level field inspection objects. **Availability:** `logtalk_load(ieee_754(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-14 **Compilation flags:** `static` **Uses:** list type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `source_bits/2` - `bits_fields/5` - `bits_finite_binary_rational/4` - `bits_nan_payload/2` - `bits_nan_kind/2` - `canonical_nan_bits/1` - `nan_bits/1` - `valid_bits/1` - `canonical_order_bytes/3` - `order_bytes/3` - `bytes_tail/3` - `bytes_to_unsigned_integer/2` - `bytes_to_unsigned_integer/3` - `integer_to_bytes/3` - `zero_bits/2` - `zero_from_sign/2` - `apply_float_sign/3` - `precision_spec/5` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `source_bits/2` Validates and normalizes a source term into canonical-order unsigned integer bits for the selected precision and byte order. **Compilation flags:** `static` **Template:** `source_bits(Source,Bits)` **Mode and number of proofs:** `source_bits(++compound,--integer)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is not a variable but uses `bytes(Bytes)` or `bits(Bits)` with an encoding incompatible with the selected precision: `domain_error(ieee_754_encoding,Source)` `Source` is not a valid IEEE 754 source term: `domain_error(ieee_754_source,Source)` ------------------------------------------------------------------------ ###### `bits_fields/5` Extracts exact IEEE 754 sign, exponent bits, mantissa bits, and a class atom from a validated bit pattern. **Compilation flags:** `static` **Template:** `bits_fields(Bits,Sign,ExponentBits,MantissaBits,Class)` **Mode and number of proofs:** `bits_fields(+integer,-integer,-integer,-integer,-atom)` - `one` ------------------------------------------------------------------------ ###### `bits_finite_binary_rational/4` Extracts an exact finite IEEE 754 value from a validated bit pattern as `(-1)^Sign`` ``*`` ``Significand`` ``*`` ``2^Exponent`. **Compilation flags:** `static` **Template:** `bits_finite_binary_rational(Bits,Sign,Significand,Exponent)` **Mode and number of proofs:** `bits_finite_binary_rational(+integer,-integer,-integer,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bits_nan_payload/2` Extracts the raw NaN mantissa payload bits from a validated bit pattern. **Compilation flags:** `static` **Template:** `bits_nan_payload(Bits,PayloadBits)` **Mode and number of proofs:** `bits_nan_payload(+integer,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `bits_nan_kind/2` Classifies a validated NaN bit pattern as `quiet` or `signaling` using the quiet/signaling discriminator bit for the selected precision. **Compilation flags:** `static` **Template:** `bits_nan_kind(Bits,Kind)` **Mode and number of proofs:** `bits_nan_kind(+integer,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `canonical_nan_bits/1` Returns the canonical quiet NaN bit pattern for the selected precision. **Compilation flags:** `static` **Template:** `canonical_nan_bits(Bits)` **Mode and number of proofs:** `canonical_nan_bits(-integer)` - `one` ------------------------------------------------------------------------ ###### `nan_bits/1` True when the validated bit pattern encodes a NaN value for the selected precision. **Compilation flags:** `static` **Template:** `nan_bits(Bits)` **Mode and number of proofs:** `nan_bits(+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_bits/1` True when the integer fits in the selected precision bit width. **Compilation flags:** `static` **Template:** `valid_bits(Bits)` **Mode and number of proofs:** `valid_bits(+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `canonical_order_bytes/3` Converts byte lists from the selected byte order to canonical big-endian order. **Compilation flags:** `static` **Template:** `canonical_order_bytes(ByteOrder,Bytes,CanonicalBytes)` **Mode and number of proofs:** `canonical_order_bytes(+atom,+list(integer),-list(integer))` - `one` ------------------------------------------------------------------------ ###### `order_bytes/3` Converts canonical big-endian bytes to the selected byte order. **Compilation flags:** `static` **Template:** `order_bytes(ByteOrder,CanonicalBytes,Bytes)` **Mode and number of proofs:** `order_bytes(+atom,+list(integer),-list(integer))` - `one` ------------------------------------------------------------------------ ###### `bytes_tail/3` Builds a difference list from a byte list. **Compilation flags:** `static` **Template:** `bytes_tail(Bytes,DifferenceList,Tail)` **Mode and number of proofs:** `bytes_tail(+list(integer),-list(integer),?list(integer))` - `one` ------------------------------------------------------------------------ ###### `bytes_to_unsigned_integer/2` Converts canonical-order bytes into an unsigned integer. **Compilation flags:** `static` **Template:** `bytes_to_unsigned_integer(Bytes,Integer)` **Mode and number of proofs:** `bytes_to_unsigned_integer(+list(integer),-integer)` - `one` ------------------------------------------------------------------------ ###### `bytes_to_unsigned_integer/3` Worker predicate for converting canonical-order bytes into an unsigned integer. **Compilation flags:** `static` **Template:** `bytes_to_unsigned_integer(Bytes,Integer0,Integer)` **Mode and number of proofs:** `bytes_to_unsigned_integer(+list(integer),+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `integer_to_bytes/3` Converts an unsigned integer into a canonical-order byte list with the requested length. **Compilation flags:** `static` **Template:** `integer_to_bytes(Count,Integer,Bytes)` **Mode and number of proofs:** `integer_to_bytes(+integer,+integer,-list(integer))` - `one` ------------------------------------------------------------------------ ###### `zero_bits/2` Returns the zero encoding bits with the requested sign bit. **Compilation flags:** `static` **Template:** `zero_bits(Sign,Bits)` **Mode and number of proofs:** `zero_bits(+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `zero_from_sign/2` Constructs a positive or negative floating-point zero from a sign bit. **Compilation flags:** `static` **Template:** `zero_from_sign(Sign,Zero)` **Mode and number of proofs:** `zero_from_sign(+integer,-float)` - `one` ------------------------------------------------------------------------ ###### `apply_float_sign/3` Applies a sign bit to a positive floating-point magnitude. **Compilation flags:** `static` **Template:** `apply_float_sign(Sign,Magnitude,Value)` **Mode and number of proofs:** `apply_float_sign(+integer,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `precision_spec/5` Returns the exponent width, mantissa width, exponent bias, and byte count for a supported IEEE 754 precision. **Compilation flags:** `static` **Template:** `precision_spec(Precision,ExponentWidth,MantissaWidth,Bias,ByteCount)` **Mode and number of proofs:** `precision_spec(+atom,-integer,-integer,-integer,-integer)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `ieee_754_fields(Precision,ByteOrder)` - `Precision` - Floating-point format precision. Supported values are `half`, `single`, and `double`. - `ByteOrder` - Byte order used when reading byte sequences. Supported values are `big` and `little`. IEEE 754 exact bit-field classifier and decomposition object. **Availability:** `logtalk_load(ieee_754(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ieee_754_fields_protocol **Imports:** `public` ieee_754_common(Precision,ByteOrder) **Remarks:** (none) **Inherited public predicates:**  byte_count/1  classify/2  fields/5  finite_binary_rational/4  nan_kind/2  nan_payload/2  order/1  precision/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `ieee_754_fields_protocol` IEEE 754 exact bit-field support library protocol. Intended to be implemented by parameterized objects such as `ieee_754_fields(Precision,`` ``ByteOrder)`. **Availability:** `logtalk_load(ieee_754(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-09 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `classify/2` - `fields/5` - `finite_binary_rational/4` - `nan_payload/2` - `nan_kind/2` - `precision/1` - `order/1` - `byte_count/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `classify/2` Classifies an IEEE 754 encoding source term as `zero`, `subnormal`, `normal`, `infinity`, or `not_a_number` for the selected precision and byte order. Supported source terms are `bytes(Bytes)` and `bits(Bits)`. **Compilation flags:** `static` **Template:** `classify(Source,Class)` **Mode and number of proofs:** `classify(++compound,--atom)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source term: `domain_error(ieee_754_source,Source)` `Source` does not contain a valid encoding for the selected object: `domain_error(ieee_754_encoding,Source)` ------------------------------------------------------------------------ ###### `fields/5` Extracts the exact IEEE 754 sign bit, exponent bits, mantissa bits, and classification from a source term. **Compilation flags:** `static` **Template:** `fields(Source,Sign,ExponentBits,MantissaBits,Class)` **Mode and number of proofs:** `fields(++compound,--integer,--integer,--integer,--atom)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source term: `domain_error(ieee_754_source,Source)` `Source` does not contain a valid encoding for the selected object: `domain_error(ieee_754_encoding,Source)` ------------------------------------------------------------------------ ###### `finite_binary_rational/4` Extracts the exact finite IEEE 754 value as `(-1)^Sign`` ``*`` ``Significand`` ``*`` ``2^Exponent` from a source term. Zero encodings return a zero significand and exponent `0`. **Compilation flags:** `static` **Template:** `finite_binary_rational(Source,Sign,Significand,Exponent)` **Mode and number of proofs:** `finite_binary_rational(++compound,--integer,--integer,--integer)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source term: `domain_error(ieee_754_source,Source)` `Source` does not contain a valid encoding for the selected object: `domain_error(ieee_754_encoding,Source)` `Source` does not encode a finite IEEE 754 value: `domain_error(ieee_754_finite_encoding,Source)` ------------------------------------------------------------------------ ###### `nan_payload/2` Extracts the raw NaN mantissa payload bits from a source term. **Compilation flags:** `static` **Template:** `nan_payload(Source,PayloadBits)` **Mode and number of proofs:** `nan_payload(++compound,--integer)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source term: `domain_error(ieee_754_source,Source)` `Source` does not contain a valid encoding for the selected object: `domain_error(ieee_754_encoding,Source)` `Source` does not encode a NaN value: `domain_error(ieee_754_nan_encoding,Source)` ------------------------------------------------------------------------ ###### `nan_kind/2` Classifies a NaN source term as `quiet` or `signaling` using the exact IEEE 754 quiet/signaling discriminator bit for the selected precision. **Compilation flags:** `static` **Template:** `nan_kind(Source,Kind)` **Mode and number of proofs:** `nan_kind(++compound,--atom)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source term: `domain_error(ieee_754_source,Source)` `Source` does not contain a valid encoding for the selected object: `domain_error(ieee_754_encoding,Source)` `Source` does not encode a NaN value: `domain_error(ieee_754_nan_encoding,Source)` ------------------------------------------------------------------------ ###### `precision/1` Returns the selected IEEE 754 precision. Expected values are `half`, `single`, or `double`. **Compilation flags:** `static` **Template:** `precision(Precision)` **Mode and number of proofs:** `precision(-atom)` - `one` ------------------------------------------------------------------------ ###### `order/1` Returns the selected byte order. Expected values are `big` or `little`. **Compilation flags:** `static` **Template:** `order(ByteOrder)` **Mode and number of proofs:** `order(-atom)` - `one` ------------------------------------------------------------------------ ###### `byte_count/1` Returns the number of bytes used by the selected precision. **Compilation flags:** `static` **Template:** `byte_count(ByteCount)` **Mode and number of proofs:** `byte_count(-integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `ieee_754_protocol` IEEE 754 floating-point support library protocol. Intended to be implemented by parameterized objects such as `ieee_754(Precision,`` ``ByteOrder,`` ``NaNRepresentation)`. **Availability:** `logtalk_load(ieee_754(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2026-05-09 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `generate/3` - `valid/1` - `exactly_representable/1` - `precision/1` - `order/1` - `nan_representation/1` - `byte_count/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses an IEEE 754 value from a source term for the selected precision, byte order, and NaN representation policy. Supported source terms are `bytes(Bytes)` and `bits(Bits)`. **Compilation flags:** `static` **Template:** `parse(Source,Value)` **Mode and number of proofs:** `parse(++compound,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source term: `domain_error(ieee_754_source,Source)` `Source` does not contain a valid encoding for the selected object: `domain_error(ieee_754_encoding,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates an IEEE 754 encoding for a value term using the selected precision and byte order. Supported sink terms are `bytes(Bytes)` and `bits(Bits)`. Finite values are encoded using the selected precision rounding semantics. **Compilation flags:** `static` **Template:** `generate(Sink,Value)` **Mode and number of proofs:** `generate(+compound,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid sink term: `domain_error(ieee_754_sink,Sink)` `Value` is neither a valid finite float nor a supported IEEE 754 special value term: `domain_error(ieee_754_value,Value)` `Value` cannot be represented in the selected precision: `domain_error(ieee_754_representation,Value)` ------------------------------------------------------------------------ ###### `generate/3` Generates an IEEE 754 encoding as a list of bytes with an open tail. Intended for use by libraries that build larger binary payloads using difference lists. **Compilation flags:** `static` **Template:** `generate(Value,Bytes,Tail)` **Mode and number of proofs:** `generate(+term,-list(byte),--variable)` - `one_or_error` **Exceptions:** `Value` is neither a valid finite float nor a supported IEEE 754 special value term: `domain_error(ieee_754_value,Value)` `Value` cannot be represented in the selected precision: `domain_error(ieee_754_representation,Value)` ------------------------------------------------------------------------ ###### `valid/1` True iff the argument is a valid value term for the selected object. Valid terms are finite floats plus the special values supported by the selected NaN representation policy. **Compilation flags:** `static` **Template:** `valid(Value)` **Mode and number of proofs:** `valid(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `exactly_representable/1` True iff the argument can be encoded in the selected precision and decoded again without loss of value information under the selected NaN representation policy. Intended for callers such as MessagePack that choose the smallest exact binary format. **Compilation flags:** `static` **Template:** `exactly_representable(Value)` **Mode and number of proofs:** `exactly_representable(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `precision/1` Returns the selected IEEE 754 precision. Expected values are `half`, `single`, or `double`. **Compilation flags:** `static` **Template:** `precision(Precision)` **Mode and number of proofs:** `precision(-atom)` - `one` ------------------------------------------------------------------------ ###### `order/1` Returns the selected byte order. Expected values are `big` or `little`. **Compilation flags:** `static` **Template:** `order(ByteOrder)` **Mode and number of proofs:** `order(-atom)` - `one` ------------------------------------------------------------------------ ###### `nan_representation/1` Returns the selected NaN representation policy. Expected values are `canonical` and `payloads`. **Compilation flags:** `static` **Template:** `nan_representation(NaNRepresentation)` **Mode and number of proofs:** `nan_representation(-atom)` - `one` ------------------------------------------------------------------------ ###### `byte_count/1` Returns the number of bytes used by the selected precision. **Compilation flags:** `static` **Template:** `byte_count(ByteCount)` **Mode and number of proofs:** `byte_count(-integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### intervals") **object** #### `interval` Basic temporal interval relations. An interval is represented by a compound term, `i/2`, with two ground arguments, the start and end points. **Availability:** `logtalk_load(intervals(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2026-05-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` interval_protocol **Aliases:** `interval_protocol` `before/2` as `b/2` `interval_protocol` `after/2` as `bi/2` `interval_protocol` `meets/2` as `m/2` `interval_protocol` `met_by/2` as `mi/2` `interval_protocol` `overlaps/2` as `o/2` `interval_protocol` `overlapped_by/2` as `oi/2` `interval_protocol` `starts/2` as `s/2` `interval_protocol` `started_by/2` as `si/2` `interval_protocol` `during/2` as `d/2` `interval_protocol` `contains/2` as `di/2` `interval_protocol` `finishes/2` as `f/2` `interval_protocol` `finished_by/2` as `fi/2` `interval_protocol` `equal/2` as `eq/2` **Remarks:** (none) **Inherited public predicates:**  after/2  before/2  contains/2  during/2  equal/2  finished_by/2  finishes/2  meets/2  met_by/2  new/3  overlapped_by/2  overlaps/2  relation/3  started_by/2  starts/2  valid/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `interval_algebra` Allen interval algebra over the 13 base relation atoms. Composition results are returned as canonical ordered duplicate-free lists. **Availability:** `logtalk_load(intervals(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` interval_algebra_protocol **Remarks:** (none) **Inherited public predicates:**  compose/3  converse/2  relation/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `interval_algebra_protocol` Allen interval algebra protocol over the 13 base relation atoms. **Availability:** `logtalk_load(intervals(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `relation/1` - `converse/2` - `compose/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `relation/1` Enumerates valid Allen base relation atoms in canonical order. **Compilation flags:** `static` **Template:** `relation(Relation)` **Mode and number of proofs:** `relation(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `converse/2` Relates an Allen base relation atom with its converse relation atom. **Compilation flags:** `static` **Template:** `converse(Relation,Converse)` **Mode and number of proofs:** `converse(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `compose/3` Returns the canonical ordered list of Allen base relation atoms resulting from composing two Allen base relation atoms. **Compilation flags:** `static` **Template:** `compose(Relation1,Relation2,Relations)` **Mode and number of proofs:** `compose(+atom,+atom,-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also interval_protocol, interval, interval_algebra, interval_relation_set_protocol, interval_relation_set **object** #### `interval_constraint_network` Allen interval constraint-network operations built on canonical relation sets, intended for small-to-medium symbolic networks. **Availability:** `logtalk_load(intervals(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` interval_constraint_network_protocol **Uses:** interval_relation_set list **Remarks:** (none) **Inherited public predicates:**  consistent/1  constraints/2  contradiction/2  contradiction_explanations/2  entailment_explanations/5  entails/4  entails/5  equivalent/2  excluded/4  network/1  new/2  nodes/2  path_consistency/2  possible/4  propagate/2  propagate/3  propagation_triple/2  propagation_triples/2  refine/5  refine_propagate/3  refine_propagate/4  refine_propagate/5  refine_propagate/6  relation/4  subsumes/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `interval_constraint_network_protocol` Allen interval constraint-network protocol built on canonical relation sets, intended for small-to-medium symbolic networks. **Availability:** `logtalk_load(intervals(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `network/1` - `new/2` - `nodes/2` - `relation/4` - `entails/4` - `entails/5` - `possible/4` - `excluded/4` - `contradiction/2` - `entailment_explanations/5` - `contradiction_explanations/2` - `refine/5` - `consistent/1` - `propagate/2` - `propagate/3` - `refine_propagate/5` - `refine_propagate/6` - `refine_propagate/3` - `refine_propagate/4` - `propagation_triple/2` - `propagation_triples/2` - `path_consistency/2` - `constraints/2` - `subsumes/2` - `equivalent/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `network/1` True if Network is a valid interval constraint network represented as a network(Nodes, Constraints) term. **Compilation flags:** `static` **Template:** `network(Network)` **Mode and number of proofs:** `network(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `new/2` Constructs a new network for a list of distinct nodes. Distinct node pairs are initialized with the universal relation set. **Compilation flags:** `static` **Template:** `new(Nodes,Network)` **Mode and number of proofs:** `new(+list,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nodes/2` Returns the list of nodes in a network. **Compilation flags:** `static` **Template:** `nodes(Network,Nodes)` **Mode and number of proofs:** `nodes(+compound,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `relation/4` Returns the current relation set between two nodes in a network. A node is always equal to itself. **Compilation flags:** `static` **Template:** `relation(Network,Node1,Node2,RelationSet)` **Mode and number of proofs:** `relation(+compound,@term,@term,-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `entails/4` True if the current relation set between two nodes is a subset of a queried relation set. **Compilation flags:** `static` **Template:** `entails(Network,Node1,Node2,RelationSet)` **Mode and number of proofs:** `entails(+compound,@term,@term,+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `entails/5` True if the current relation set between two nodes is a subset of a queried relation set and returns an explanation term describing either a direct constraint or a supporting propagation path. **Compilation flags:** `static` **Template:** `entails(Network,Node1,Node2,RelationSet,Explanation)` **Mode and number of proofs:** `entails(+compound,@term,@term,+list(atom),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `possible/4` True if the current relation set between two nodes intersects a queried relation set. **Compilation flags:** `static` **Template:** `possible(Network,Node1,Node2,RelationSet)` **Mode and number of proofs:** `possible(+compound,@term,@term,+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `excluded/4` True if the current relation set between two nodes is disjoint from a queried relation set. **Compilation flags:** `static` **Template:** `excluded(Network,Node1,Node2,RelationSet)` **Mode and number of proofs:** `excluded(+compound,@term,@term,+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `contradiction/2` Returns a simple contradiction explanation for an inconsistent network as contradiction(Node1, Node2, Cause). **Compilation flags:** `static` **Template:** `contradiction(Network,Explanation)` **Mode and number of proofs:** `contradiction(+compound,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `entailment_explanations/5` Returns the list of immediate explanations supporting an entailed relation query, using identity, direct, and propagated explanation terms. **Compilation flags:** `static` **Template:** `entailment_explanations(Network,Node1,Node2,RelationSet,Explanations)` **Mode and number of proofs:** `entailment_explanations(+compound,@term,@term,+list(atom),-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `contradiction_explanations/2` Returns the list of contradiction explanations for all empty explicit pair constraints in a network. **Compilation flags:** `static` **Template:** `contradiction_explanations(Network,Explanations)` **Mode and number of proofs:** `contradiction_explanations(+compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `refine/5` Refines the relation set between two distinct nodes by intersecting it with a new relation set. **Compilation flags:** `static` **Template:** `refine(Network,Node1,Node2,RelationSet,RefinedNetwork)` **Mode and number of proofs:** `refine(+compound,@term,@term,+list(atom),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `consistent/1` True if all explicit pair constraints in a network are non-empty. **Compilation flags:** `static` **Template:** `consistent(Network)` **Mode and number of proofs:** `consistent(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `propagate/2` Computes a path-consistency closure and succeeds only if the resulting network is consistent. Intended for small-to-medium symbolic networks; not a large-scale temporal CSP solver. **Compilation flags:** `static` **Template:** `propagate(Network,Closure)` **Mode and number of proofs:** `propagate(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `propagate/3` Computes a path-consistency closure, returns the list of propagated changes, and succeeds only if the resulting network is consistent. Intended for small-to-medium symbolic networks; not a large-scale temporal CSP solver. **Compilation flags:** `static` **Template:** `propagate(Network,Closure,Changes)` **Mode and number of proofs:** `propagate(+compound,-compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `refine_propagate/5` Refines the relation set between two distinct nodes and then propagates the consequences, succeeding only if the resulting network is consistent. Intended for small-to-medium symbolic networks; not a large-scale temporal CSP solver. **Compilation flags:** `static` **Template:** `refine_propagate(Network,Node1,Node2,RelationSet,Closure)` **Mode and number of proofs:** `refine_propagate(+compound,@term,@term,+list(atom),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `refine_propagate/6` Refines the relation set between two distinct nodes, propagates the consequences incrementally, and returns the list of direct and propagated changes, succeeding only if the resulting network is consistent. Intended for small-to-medium symbolic networks; not a large-scale temporal CSP solver. **Compilation flags:** `static` **Template:** `refine_propagate(Network,Node1,Node2,RelationSet,Closure,Changes)` **Mode and number of proofs:** `refine_propagate(+compound,@term,@term,+list(atom),-compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `refine_propagate/3` Applies a batch of relation-set refinements represented as constraint(Node1, Node2, RelationSet) terms and then propagates the combined consequences, succeeding only if the resulting network is consistent. Intended for small-to-medium symbolic networks; not a large-scale temporal CSP solver. **Compilation flags:** `static` **Template:** `refine_propagate(Network,Constraints,Closure)` **Mode and number of proofs:** `refine_propagate(+compound,+list(compound),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `refine_propagate/4` Applies a batch of relation-set refinements, propagates the combined consequences incrementally, and returns the list of direct and propagated changes, succeeding only if the resulting network is consistent. Intended for small-to-medium symbolic networks; not a large-scale temporal CSP solver. **Compilation flags:** `static` **Template:** `refine_propagate(Network,Constraints,Closure,Changes)` **Mode and number of proofs:** `refine_propagate(+compound,+list(compound),-compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `propagation_triple/2` Extracts the causing node triple triple(Node1, Node3, Node2) from a propagated change term. **Compilation flags:** `static` **Template:** `propagation_triple(Change,Triple)` **Mode and number of proofs:** `propagation_triple(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `propagation_triples/2` Collects the unique node triples that caused propagated refinements in a list of change terms. **Compilation flags:** `static` **Template:** `propagation_triples(Changes,Triples)` **Mode and number of proofs:** `propagation_triples(+list(compound),-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `path_consistency/2` Computes the path-consistency closure of a network by iterative refinement using relation-set composition and intersection. Intended for small-to-medium symbolic networks; not a large-scale temporal CSP solver. **Compilation flags:** `static` **Template:** `path_consistency(Network,Closure)` **Mode and number of proofs:** `path_consistency(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `constraints/2` Returns the explicit pair constraints in canonical storage order using constraint(Node1, Node2, RelationSet) terms. **Compilation flags:** `static` **Template:** `constraints(Network,Constraints)` **Mode and number of proofs:** `constraints(+compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `subsumes/2` True if the first network is at least as general as the second network, i.e. every pair relation set in the second network is a subset of the corresponding relation set in the first network. **Compilation flags:** `static` **Template:** `subsumes(Network1,Network2)` **Mode and number of proofs:** `subsumes(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `equivalent/2` True if two networks contain the same nodes and mutually subsume each other. **Compilation flags:** `static` **Template:** `equivalent(Network1,Network2)` **Mode and number of proofs:** `equivalent(+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also interval_relation_set_protocol, interval_relation_set, interval_algebra_protocol, interval_algebra **protocol** #### `interval_protocol` Basic temporal interval relations protocol (based on James F. Allen Interval Algebra work). **Availability:** `logtalk_load(intervals(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-05-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `new/3` - `valid/1` - `relation/3` - `before/2` - `after/2` - `meets/2` - `met_by/2` - `overlaps/2` - `overlapped_by/2` - `starts/2` - `started_by/2` - `during/2` - `contains/2` - `finishes/2` - `finished_by/2` - `equal/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `new/3` Constructs a new interval given start and end points. The start point must strictly precede the end point. **Compilation flags:** `static` **Template:** `new(Start,End,Interval)` **Mode and number of proofs:** `new(@ground,@ground,-interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid/1` True if Interval is a valid interval. **Compilation flags:** `static` **Template:** `valid(Interval)` **Mode and number of proofs:** `valid(@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `relation/3` Classifies two valid intervals according to their unique Allen base relation. **Compilation flags:** `static` **Template:** `relation(Interval1,Interval2,Relation)` **Mode and number of proofs:** `relation(@interval,@interval,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `before/2` True if `Interval1` takes place before `Interval2`. **Compilation flags:** `static` **Template:** `before(Interval1,Interval2)` **Mode and number of proofs:** `before(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `after/2` True if `Interval1` takes place after `Interval2`. **Compilation flags:** `static` **Template:** `after(Interval1,Interval2)` **Mode and number of proofs:** `after(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `meets/2` True if `Interval1` meets `Interval2`. **Compilation flags:** `static` **Template:** `meets(Interval1,Interval2)` **Mode and number of proofs:** `meets(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `met_by/2` True if `Interval1` is met by `Interval2`. **Compilation flags:** `static` **Template:** `met_by(Interval1,Interval2)` **Mode and number of proofs:** `met_by(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `overlaps/2` True if `Interval1` overlaps with `Interval2`. **Compilation flags:** `static` **Template:** `overlaps(Interval1,Interval2)` **Mode and number of proofs:** `overlaps(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `overlapped_by/2` True if `Interval1` is overlapped by `Interval2`. **Compilation flags:** `static` **Template:** `overlapped_by(Interval1,Interval2)` **Mode and number of proofs:** `overlapped_by(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `starts/2` True if `Interval1` starts `Interval2`. **Compilation flags:** `static` **Template:** `starts(Interval1,Interval2)` **Mode and number of proofs:** `starts(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `started_by/2` True if `Interval1` is started by `Interval2`. **Compilation flags:** `static` **Template:** `started_by(Interval1,Interval2)` **Mode and number of proofs:** `started_by(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `during/2` True if `Interval1` occurs during `Interval2`. **Compilation flags:** `static` **Template:** `during(Interval1,Interval2)` **Mode and number of proofs:** `during(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `contains/2` True if `Interval1` contains `Interval2`. **Compilation flags:** `static` **Template:** `contains(Interval1,Interval2)` **Mode and number of proofs:** `contains(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `finishes/2` True if `Interval1` finishes `Interval2`. **Compilation flags:** `static` **Template:** `finishes(Interval1,Interval2)` **Mode and number of proofs:** `finishes(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `finished_by/2` True if `Interval1` is finished by `Interval2`. **Compilation flags:** `static` **Template:** `finished_by(Interval1,Interval2)` **Mode and number of proofs:** `finished_by(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ###### `equal/2` True if `Interval1` is equal to `Interval2`. **Compilation flags:** `static` **Template:** `equal(Interval1,Interval2)` **Mode and number of proofs:** `equal(@interval,@interval)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also interval, interval_algebra_protocol, interval_algebra, interval_relation_set_protocol, interval_relation_set **object** #### `interval_relation_set` Allen interval relation-set operations using canonical ordered duplicate-free lists of base relation atoms. **Availability:** `logtalk_load(intervals(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` interval_relation_set_protocol **Uses:** interval_algebra list **Remarks:** (none) **Inherited public predicates:**  compose/3  converse/2  empty/1  intersection/3  member/2  normalize/2  relation_set/1  singleton/2  subset/2  union/3  universal/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `interval_relation_set_protocol` Allen interval relation-set protocol using canonical ordered duplicate-free lists of base relation atoms. **Availability:** `logtalk_load(intervals(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `relation_set/1` - `empty/1` - `universal/1` - `singleton/2` - `normalize/2` - `member/2` - `subset/2` - `intersection/3` - `union/3` - `converse/2` - `compose/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `relation_set/1` True if RelationSet is a canonical ordered duplicate-free list of Allen base relation atoms. **Compilation flags:** `static` **Template:** `relation_set(RelationSet)` **Mode and number of proofs:** `relation_set(?list(atom))` - `zero_or_more` ------------------------------------------------------------------------ ###### `empty/1` Returns the empty Allen relation set. **Compilation flags:** `static` **Template:** `empty(RelationSet)` **Mode and number of proofs:** `empty(?list(atom))` - `one` ------------------------------------------------------------------------ ###### `universal/1` Returns the universal Allen relation set containing all 13 base relation atoms. **Compilation flags:** `static` **Template:** `universal(RelationSet)` **Mode and number of proofs:** `universal(?list(atom))` - `one` ------------------------------------------------------------------------ ###### `singleton/2` Relates an Allen base relation atom with its singleton relation set. **Compilation flags:** `static` **Template:** `singleton(Relation,RelationSet)` **Mode and number of proofs:** `singleton(?atom,?list(atom))` - `zero_or_more` ------------------------------------------------------------------------ ###### `normalize/2` Normalizes a list of Allen base relation atoms into canonical ordered duplicate-free form. **Compilation flags:** `static` **Template:** `normalize(Relations,RelationSet)` **Mode and number of proofs:** `normalize(+list(atom),-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `member/2` True if Relation is a member of RelationSet. **Compilation flags:** `static` **Template:** `member(Relation,RelationSet)` **Mode and number of proofs:** `member(?atom,+list(atom))` - `zero_or_more` ------------------------------------------------------------------------ ###### `subset/2` True if RelationSet1 is a subset of RelationSet2. **Compilation flags:** `static` **Template:** `subset(RelationSet1,RelationSet2)` **Mode and number of proofs:** `subset(+list(atom),+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `intersection/3` Computes the intersection of two relation sets. **Compilation flags:** `static` **Template:** `intersection(RelationSet1,RelationSet2,Intersection)` **Mode and number of proofs:** `intersection(+list(atom),+list(atom),-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `union/3` Computes the union of two relation sets. **Compilation flags:** `static` **Template:** `union(RelationSet1,RelationSet2,Union)` **Mode and number of proofs:** `union(+list(atom),+list(atom),-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `converse/2` Maps a relation set to the canonical ordered set of converse relations. **Compilation flags:** `static` **Template:** `converse(RelationSet,ConverseSet)` **Mode and number of proofs:** `converse(+list(atom),-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `compose/3` Computes the canonical ordered relation set resulting from composing two relation sets. **Compilation flags:** `static` **Template:** `compose(RelationSet1,RelationSet2,Composition)` **Mode and number of proofs:** `compose(+list(atom),+list(atom),-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also interval_algebra_protocol, interval_algebra, interval_relation_set ### iqr_anomaly_detector") **object** #### `iqr_anomaly_detector` Statistical interquartile-range anomaly detector for continuous datasets. Learns per-attribute quartiles and interquartile ranges from baseline training examples selected from a dataset object implementing the `anomaly_dataset_protocol` protocol and returns a detector term that can be used for scoring, prediction, and export. **Availability:** `logtalk_load(iqr_anomaly_detector(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` anomaly_detector_common **Uses:** format list numberlist pairs sample type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  score/3  score_all/3  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_protocol, modified_z_score_anomaly_detector, z_score_anomaly_detector, isolation_forest_anomaly_detector, knn_distance_anomaly_detector, lof_anomaly_detector ### iso8601") **object** #### `iso8601` ISO 8601 (and European civil calendar) compliant library of date and time predicates. **Availability:** `logtalk_load(iso8601(loader))` **Author:** Daniel L. Dudley and Paulo Moura **Version:** 1:3:0 **Date:** 2026-04-08 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list os **Remarks:** > - Scope: This object currently provides a powerful, versatile and efficient set of date-handling predicates, which–thanks to Logtalk–may be used as is on a wide range of Prolog compilers. Besides taking time to familiarize oneself with each predicate, the user should take note of the following information. > > - Validation of dates: Date parts are not validated–that is the caller’s responsibility! However, not being quite heartless yet, we do provide a predicate for this purpose. > > - Date arithmetic: Many of the examples illustrate a simplified method of doing date arithmetic. Note, however, that we do not generally recommend this practice–it is all too easy to make mistakes. The safest way of finding the day difference between two dates is to first convert the dates to their Julian day numbers and then subtract one from the other. Similarly, the safe way to add or subtract a day offset to a particular date is to first convert the date to its Julian day number, add or subtract the day offset, and then convert the result to its corresponding date. > > - BC years: ISO 8601 specifies that the Gregorian calendar be used, yet requires that years prior to 1 AD be handled arithmetically, i.e., the year we know as 1 BC is year 0, 2 BC is year -1, 3 BC is year -2 and so on. We do not follow ISO 8601 with regard to the handling of BC years. Our date predicates will accept and interpret an input year 0 as 1 BC; however, a negative year, Year, should always be interpreted as `abs(Year)`` ``=:=`` ``Year`` ``BC`. We believe that the average person will find our handling of BC years more user-friendly than the ISO 8601 one, but we encourage feedback from users with a view to a possible change in future versions. > > - Week numbers: It is possible for a day (date) to have a week number that belongs to another year. Up to three of the first days of a calendar year may belong to the last week (number) of the prior calendar year, and up to three days of the last days of a calendar year may belong to the first week (number) of the next calendar year. It for this reason that the Week parameter in `date/6-7` is a compound term, namely `week(WeekNo,ActualYear)`. > > - Computation of Gregorian Easter Sunday: The algorithm is based upon the “Gaussian rule”. Proleptic use is limited to years \> 1582 AD, that is, after the introduction of the Gregorian calendar. > > - Some Christian feast day offsets from Easter Sunday: Carnival Monday: -48 days, Mardi Gras (Shrove Tuesday): -47 days, Ash Wednesday: -46 days, Palm Sunday: -7 days, Easter Friday: -2 days, Easter Saturday: -1 day, Easter Monday: +1 day, Ascension of Christ: +39 days, Whitsunday: +49 days, Whitmonday: +50 days, Feast of Corpus Christi: +60 days. **Inherited public predicates:** (none) - Public predicates - `date/4` - `date/5` - `date/6` - `date/7` - `date_string/3` - `time_string/3` - `date_time_string/3` - `duration_string/2` - `interval_string/2` - `valid_date/3` - `leap_year/1` - `calendar_month/3` - `easter_day/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `date/4` Get the system date and/or its Julian Day \# or convert a Julian Day \# to/from given date parts. **Compilation flags:** `static` **Template:** `date(JD,Year,Month,Day)` `JD` - Julian day serial number. `Year` - 0 or negative if converted BC year, positive otherwise. `Month` - Normally an integer between 1 and 12 inclusive. `Day` - Normally an integer between 1 and 31 inclusive depending upon month. **Mode and number of proofs:** `date(?integer,?integer,?integer,?integer)` - `zero_or_one` **Examples:** Current date (i.e., today) `date(JD,Year,Month,Day)` `JD=2453471,Year=2005,Month=4,Day=10` Convert a date to its Julian day number `date(JD,2000,2,29)` `JD=2451604` Convert a Julian day number to its date `date(2451604,Year,Month,Day)` `Year=2000,Month=2,Day=29` What is the date of day \# 60 in year 2000? `date(JD,2000,1,60)` `JD=2451604` What is the Julian of the 1st day prior to 2000-1-1? `date(JD,2000,1,0)` `JD=2451544` What is the Julian of the 60th day prior to 2000-1-1? `date(JD,2000,1,-59)` `JD=2451485` Illegal date is auto-adjusted (see also next query) `date(JD,1900,2,29)` `JD=2415080` This is the correct date! `date(2415080,Year,Month,Day)` `Year=1900,Month=3,Day=1` ------------------------------------------------------------------------ ###### `date/5` Ditto `date/4` + get/check its day-of-week \#. **Compilation flags:** `static` **Template:** `date(JD,Year,Month,Day,DoW)` `JD` - Julian day serial number. `Year` - 0 or negative if converted BC year, positive otherwise. `Month` - Normally an integer between 1 and 12 inclusive. `Day` - Normally an integer between 1 and 31 inclusive depending upon month. `DoW` - Day of week, where Monday=1, Tuesday=2, …, Sunday=7. **Mode and number of proofs:** `date(?integer,?integer,?integer,?integer,?integer)` - `zero_or_one` **Examples:** Get the Julian and the day-of-week \# of a date `date(JD,2000,2,29,DoW)` `JD=2451604,DoW=2` Check the validity of a given date (day-of-week is 2, not 4) `date(_,2002,3,5,4)` `no` Get the Julian day of a given date if it is a Sunday `date(JD,2004,2,29,7)` `JD=2453065` Get the date and day-of-week \# of a Julian `date(2451545,Year,Month,Day,DoW)` `Year=2000,Month=1,Day=1,DoW=6` ------------------------------------------------------------------------ ###### `date/6` Ditto `date/5` + get/check its week \#. **Compilation flags:** `static` **Template:** `date(JD,Year,Month,Day,DoW,Week)` `JD` - Julian day serial number. `Year` - 0 or negative if converted BC year, positive otherwise. `Month` - Normally an integer between 1 and 12 inclusive. `Day` - Normally an integer between 1 and 31 inclusive depending upon month. `DoW` - Day of week, where Monday=1, Tuesday=2, …, Sunday=7. `Week` - Compound term, `week(WeekNo,ActualYear)`, of a day. **Mode and number of proofs:** `date(?integer,?integer,?integer,?integer,?integer,?compound)` - `zero_or_one` **Examples:** Get the day-of-week and week number of a date `date(_,2000,1,1,DoW,Week)` `DoW=6,Week=week(52,1999)` Get the week number and year of this week `date(_,_,_,_,_,Week)` `Week=week(7,2004)` Get the Julian number and the week of a date if it is a Sunday `date(JD,2004,2,29,7,Week)` `JD=2453065,Week=week(9,2004)` Get the day-of-week and week of a Julian day number `date(2453066,_,_,_,DoW,Week)` `DoW=1,Week=week(10,2004)` Check that given date data matches `date(_,2004,3,1,1,week(10,2004))` `yes` What is the date of a day of week (default is 1) in given week \# and year? `date(_,Year,Month,Day,DoW,week(26,2004))` `Year=2004,Month=6,Day=21,DoW=1` Ditto for Sunday `date(_,Year,Month,Day,7,week(1,2005))` `Year=2005,Month=1,Day=9` Ditto for Tuesday in following week `date(_,Year,Month,Day,9,week(1,2005))` `Year=2005,Month=1,Day=11` Ditto for Thursday in the prior week `date(_,Year,Month,Day,4,week(0,2005))` `Year=2004,Month=12,Day=30` Ditto for Tuesday two weeks prior `date(_,Year,Month,Day,2,week(-1,2005))` `Year=2004,Month=12,Day=21` Ditto for Saturday `date(_,Year,Month,Day,6,week(53,2004))` `Year=2005,Month=1,Day=1` Ditto for Monday (note automatic compensation of nonexistent week number) `date(_,Year,Month,Day,1,week(60,2004))` `Year=2005,Month=2,Day=14` ------------------------------------------------------------------------ ###### `date/7` Ditto `date/6` + get/check its day-of-year \#. **Compilation flags:** `static` **Template:** `date(JD,Year,Month,Day,DoW,Week,DoY)` `JD` - Julian day serial number. `Year` - 0 or negative if converted BC year, positive otherwise. `Month` - Normally an integer between 1 and 12 inclusive. `Day` - Normally an integer between 1 and 31 inclusive depending upon month. `DoW` - Day of week, where Monday=1, Tuesday=2, …, Sunday=7. `Week` - Compound term, `week(WeekNo,ActualYear)`, of a day. `DoY` - Day of year (NB! calendar year, not week \# year). **Mode and number of proofs:** `date(?integer,?integer,?integer,?integer,?integer,?compound,?integer)` - `zero_or_one` **Examples:** Get the date and day-of-year of a Julian number `date(2451649,Year,Month,Day,_,_,DoY)` `Year=2000,Month=4,Day=14,DoY=105` Get the Julian number, week number and day-of-year of a date, confirming that it is a Sunday `date(JD,2004,2,29,7,Week,DoY)` `JD=2453065,Week=week(9,2004),DoY=60` Confirm that a date is, in fact, a specific day-of-year `date(_,2004,3,1,_,_,61)` `yes` Get the Julian number, week day and day-of-year of a date `date(JD,2004,10,18,DoW,_,DoY)` `JD=2453297,DoW=1,DoY=292` Get today’s day-of-year `date(_,_,_,_,_,_,DoY)` `DoY=54` Get all missing date data (excl. Julian number) for the 60th calendar day of 2004 `date(_,2004,Month,Day,DoW,Week,60)` `Month=2,Day=29,DoW=7,Week=week(9,2004)` Match given date data and, if true, return the missing data (excl. Julian number) `date(_,2004,3,Day,DoW,Week,61)` `Day=1,DoW=1,Week=week(10,2004)` Ditto (the 61st day-of-year cannot be both day 1 and 2 of the month) `date(_,2004,_,2,_,_,61)` `no` ------------------------------------------------------------------------ ###### `date_string/3` Conversion between an ISO 8601 compliant date string and its components (truncated and expanded date representations are currently unsupported). Note that date components are not validated; that is the caller’s responsibility! **Compilation flags:** `static` **Template:** `date_string(Format,Components,String)` `Format` - ISO 8601 format. `Components` - When bound and String is free, either a Julian number or a `[Year,Month,Day]` term; it binds to the system day/date if free When free and String is bound, it binds to an integer list representing the numeric elements of String. `String` - ISO 8601 formatted string correspondent to Components. **Mode and number of proofs:** `date_string(+atom,+integer,?atom)` - `zero_or_one` `date_string(+atom,?list,?atom)` - `zero_or_one` **Examples:** Date, complete, basic (section 5.2.1.1) `date_string('YYYYMMDD',[2004,2,29],String)` `String='20040229'` Date, complete, basic (section 5.2.1.1) `date_string('YYYYMMDD',Components,'20040229')` `Components=[2004,2,29]` Date, complete, extended (section 5.2.1.1) `date_string('YYYY-MM-DD',[2003,12,16],String)` `String='2003-12-16'` Date, complete, extended (section 5.2.1.1) `date_string('YYYY-MM-DD',Components,'2003-12-16')` `Components=[2003,12,16]` Date, complete, extended (section 5.2.1.1) `date_string('YYYY-MM-DD',_,String)` `String='2004-02-17'` Date, complete, extended (section 5.2.1.1) `date_string('YYYY-MM-DD',Components,'2004-02-17')` `Components=[2004,2,17]` Date, reduced, month (section 5.2.1.2 a) `date_string('YYYY-MM',[2004,9,18],String)` `String='2004-09'` Date, reduced, month (section 5.2.1.2 a) `date_string('YYYY-MM',Components,'2004-09')` `Components=[2004,9]` Date, reduced, year (section 5.2.1.2 b) `date_string('YYYY',[1900,7,24],String)` `String='1900'` Date, reduced, year (section 5.2.1.2 b) `date_string('YYYY',Components,'1900')` `Components=[1900]` Date, reduced, century (section 5.2.1.2 c) `date_string('YY',2456557,String)` `String='20'` Date, reduced, century (section 5.2.1.2 c) `date_string('YY',Components,'20')` `Components=[20]` Date, ordinal, complete (section 5.2.2.1) `date_string('YYYYDDD',[2005,3,25],String)` `String='2005084'` Date, ordinal, complete (section 5.2.2.1) `date_string('YYYYDDD',Components,'2005084')` `Components=[2005,84]` Date, ordinal, extended (section 5.2.2.1) `date_string('YYYY-DDD',[1854,12,4],String)` `String='1854-338'` Date, ordinal, extended (section 5.2.2.1) `date_string('YYYY-DDD',Components,'1854-338')` `Components=[1854,338]` Week, complete, basic (section 5.2.3.1) `date_string('YYYYWwwD',[2000,1,2],String)` `String='1999W527'` Week, complete, basic (section 5.2.3.1) `date_string('YYYYWwwD',Components,'1999W527')` `Components=[1999,52,7]` Week, complete, extended (section 5.2.3.1) `date_string('YYYY-Www-D',[2003,12,29],String)` `String='2004-W01-1'` Week, complete, extended (section 5.2.3.1) `date_string('YYYY-Www-D',Components,'2004-W01-1')` `Components=[2004,1,1]` Week, complete, extended (section 5.2.3.1) `date_string('YYYY-Www-D',2453167,String)` `String='2004-W24-4'` Week, complete, extended (section 5.2.3.1) `date_string('YYYY-Www-D',Components,'2004-W24-4')` `Components=[2004,24,4]` Week, reduced, basic (section 5.2.3.2) `date_string('YYYYWww',[2004,2,29],String)` `String='2004W09'` Week, reduced, basic (section 5.2.3.2) `date_string('YYYYWww',Components,'2004W09')` `Components=[2004,9]` Week, reduced, extended (section 5.2.3.2) `date_string('YYYY-Www',[2004,2,29],String)` `String='2004-W09'` Week, reduced, extended (section 5.2.3.2) `date_string('YYYY-Www',Components,'2004-W09')` `Components=[2004,9]` ------------------------------------------------------------------------ ###### `time_string/3` Conversion between an ISO 8601 compliant time-of-day string and a `time(Hours,Minutes,Seconds)` term. Supported forms include basic and extended notations, with optional fractional seconds. **Compilation flags:** `static` **Template:** `time_string(Format,Time,String)` **Mode and number of proofs:** `time_string(+atom,?compound,?atom)` - `zero_or_one` **Examples:** Time, complete, extended `time_string('Thh:mm:ss',time(14,30,0),String)` `String='T14:30:00'` Time, complete, basic `time_string('Thhmmss',Time,'T143000')` `Time=time(14,30,0)` Time, complete, extended, fractional seconds `time_string('Thh:mm:ss.s',Time,'T14:30:00.125')` `Time=time(14,30,0.125)` Time, complete, extended, comma fractional seconds `time_string('Thh:mm:ss,s',Time,'T14:30:00,125')` `Time=time(14,30,0.125)` ------------------------------------------------------------------------ ###### `date_time_string/3` Conversion between an ISO 8601 compliant combined date-time string and a `date_time/6` or `date_time/7` term. Offset-aware terms use `date_time(Year,Month,Day,Hours,Minutes,Seconds,OffsetSeconds)` where `OffsetSeconds` is the UTC offset in seconds. **Compilation flags:** `static` **Template:** `date_time_string(Format,DateTime,String)` **Mode and number of proofs:** `date_time_string(+atom,?compound,?atom)` - `zero_or_one` **Examples:** Date-time, complete, extended `date_time_string('YYYY-MM-DDThh:mm:ss',date_time(2026,4,7,14,30,0),String)` `String='2026-04-07T14:30:00'` Date-time, ordinal, extended, UTC `date_time_string('YYYY-DDDThh:mm:ssZ',DateTime,'2026-097T14:30:00Z')` `DateTime=date_time(2026,4,7,14,30,0,0)` Date-time, week, complete, extended `date_time_string('YYYY-Www-DThh:mm:ss',date_time(2026,4,7,14,30,0),String)` `String='2026-W15-2T14:30:00'` Date-time, complete, basic, UTC `date_time_string('YYYYMMDDThhmmssZ',DateTime,'20260407T143000Z')` `DateTime=date_time(2026,4,7,14,30,0,0)` Date-time, complete, extended, offset `date_time_string('YYYY-MM-DDThh:mm:ss+hh:mm',DateTime,'2026-04-07T14:30:00+05:45')` `DateTime=date_time(2026,4,7,14,30,0,20700)` Date-time, complete, extended, comma fractional seconds `date_time_string('YYYY-MM-DDThh:mm:ss,sZ',DateTime,'2026-04-07T14:30:00,125Z')` `DateTime=date_time(2026,4,7,14,30,0.125,0)` ------------------------------------------------------------------------ ###### `duration_string/2` Conversion between an ISO 8601 duration string and a `duration(Years,Months,Days,Hours,Minutes,Seconds)` term. **Compilation flags:** `static` **Template:** `duration_string(Duration,String)` **Mode and number of proofs:** `duration_string(++compound,?atom)` - `zero_or_one` `duration_string(?compound,+atom)` - `zero_or_one` **Remarks:** > - Duration string: An ISO 8601 duration string encodes a length of time (not a calendar date), starting with `P` and optionally using date and time parts such as `P3D` or `P1Y2M3DT4H5M6S`. **Examples:** Parse a duration string `duration_string(Duration,'PT45M')` `Duration=duration(0,0,0,0,45,0)` Format a duration term `duration_string(duration(1,2,3,4,5,6),String)` `String='P1Y2M3DT4H5M6S'` ------------------------------------------------------------------------ ###### `interval_string/2` Conversion between an ISO 8601 interval string and an `interval(Start,End)`, `interval(Start,Duration)`, or `interval(Duration,End)` term where endpoint terms are dates (`[Year,Month,Day]`) or date-times (`date_time/6-7` terms). **Compilation flags:** `static` **Template:** `interval_string(Interval,String)` **Mode and number of proofs:** `interval_string(++compound,?atom)` - `zero_or_one` `interval_string(?compound,+atom)` - `zero_or_one` **Remarks:** > - Interval string: An ISO 8601 interval string encodes a time interval using two parts separated by `/`; each part is a date, a date-time, or a duration, e.g. `2026-02-25/2026-03-01`, `2026-04-07T14:30:00Z/2026-04-07T15:00:00Z`, or `2026-02-25/P3D`. **Examples:** Parse a start/date + duration interval `interval_string(Interval,'2026-02-25/P3D')` `Interval=interval([2026,2,25],duration(0,0,3,0,0,0))` Format a date/date interval `interval_string(interval([2026,2,25],[2026,3,1]),String)` `String='2026-02-25/2026-03-01'` Format a date-time/date-time interval `interval_string(interval(date_time(2026,4,7,14,30,0,0),date_time(2026,4,7,15,0,0,0)),String)` `String='2026-04-07T14:30:00Z/2026-04-07T15:00:00Z'` ------------------------------------------------------------------------ ###### `valid_date/3` Validate a given date in the Gregorian calendar. **Compilation flags:** `static` **Template:** `valid_date(Year,Month,Day)` **Mode and number of proofs:** `valid_date(+integer,+integer,+integer)` - `zero_or_one` **Examples:** Yes, the recent millennium was a leap year `valid_date(2000,2,29)` `yes` 2004 was also a leap year `valid_date(2004,2,29)` `yes` Only 30 days in April `valid_date(2004,4,31)` `no` 1 BC was a leap year `valid_date(-1,2,29)` `yes` ------------------------------------------------------------------------ ###### `leap_year/1` Succeed if given year is a leap year in the Gregorian calendar. **Compilation flags:** `static` **Template:** `leap_year(Year)` `Year` - The Gregorian calendar year to investigate. If free, it binds to the system year. **Mode and number of proofs:** `leap_year(?integer)` - `zero_or_one` **Examples:** No, the prior centenary was not a leap year `leap_year(1900)` `no` The recent millennium `leap_year(2000)` `yes` This year `leap_year(Year)` `Year=2004` This year (equivalent to prior query) `leap_year(_)` `yes` Next centennial `leap_year(2100)` `no` Year 0, equivalent to 1 BC `leap_year(0)` `yes` 1 BC `leap_year(-1)` `yes` 4 BC `leap_year(-4)` `no` 5 BC `leap_year(-5)` `yes` ------------------------------------------------------------------------ ###### `calendar_month/3` Compute a calendar month. **Compilation flags:** `static` **Template:** `calendar_month(Year,Month,Calendar)` `Year` - The calendar year. `Month` - The calendar month. `Calendar` - A compound term, `m/3`, composed of three main arguments specifying year, month, and a list of week and week day numbers (calendar body). **Mode and number of proofs:** `calendar_month(?integer,?integer,-compound)` - `zero_or_one` **Examples:** Compute the calendar of March, 2005 `calendar_month(2005,3,Calendar)` `Calendar=m(2005,3,[w(9,[0,1,2,3,4,5,6]),w(10,[7,8,9,10,11,12,13]),w(11,[14,15,16,17,18,19,20]),w(12,[21,22,23,24,25,26,27]),w(13,[28,29,30,31,0,0,0]),w(0,[0,0,0,0,0,0,0])])` ------------------------------------------------------------------------ ###### `easter_day/3` Compute a Gregorian Easter Sunday. **Compilation flags:** `static` **Template:** `easter_day(Year,Month,Day)` `Year` - Integer specifying the year to be investigated. `Month` - Month in which Easter Sunday falls for given year. `Day` - Day of month in which Easter Sunday falls for given year. **Mode and number of proofs:** `easter_day(?integer,-integer,-integer)` - `zero_or_one` **Examples:** Compute Easter Sunday for a particular year `easter_day(2006,Month,Day)` `Month=4,Day=16` Compute Easter Sunday for the current year `easter_day(Year,Month,Day)` `Year=2005,Month=3,Day=27` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### iso_13616") **object** #### `iso_13616` ISO 13616 IBAN parser and normalizer based on the public ISO and SWIFT registry structure definitions and MOD-97 checksum algorithm. **Availability:** `logtalk_load(iso_13616(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-07 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` iso_13616_protocol **Uses:** iso_13616_registry iso_3166 list **Remarks:** (none) **Inherited public predicates:**  canonical_iban/2  formatted_iban/2  iban/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `iso_13616_protocol` Protocol for ISO 13616 IBAN structure parsing, checksum validation, and normalization. **Availability:** `logtalk_load(iso_13616(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `iban/4` - `canonical_iban/2` - `formatted_iban/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `iban/4` Parses and validates an ISO 13616 IBAN atom into ISO 3166-1 alpha-2 country code, two-character check digits, and BBAN atom. Input may use lowercase letters and embedded spaces; successful results are normalized to uppercase compact components. **Compilation flags:** `static` **Template:** `iban(IBAN,CountryAlpha2,CheckDigits,BBAN)` **Mode and number of proofs:** `iban(+atom,?atom,?atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `canonical_iban/2` Returns the canonical electronic-format IBAN for a valid input by removing spaces and converting letters to uppercase. **Compilation flags:** `static` **Template:** `canonical_iban(IBAN,Canonical)` **Mode and number of proofs:** `canonical_iban(+atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `formatted_iban/2` Returns a valid IBAN formatted in groups of four characters separated by spaces. **Compilation flags:** `static` **Template:** `formatted_iban(IBAN,Formatted)` **Mode and number of proofs:** `formatted_iban(+atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `iso_13616_registry` Public SWIFT IBAN registry snapshot facts for ISO 13616 country-specific validation using a derived Prolog BBAN segment representation. **Availability:** `logtalk_load(iso_13616(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `country_spec/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `country_spec/3` Maps an IBAN country code to the registered total IBAN length and a derived BBAN structure term. BBANPattern is a list of `Type-Count` pairs, where Type is `a` for uppercase letters, `n` for digits, and `c` for uppercase alphanumeric characters. For example, `[a-4,`` ``n-6,`` ``n-8]` denotes four letters followed by six digits and then eight digits. **Compilation flags:** `static` **Template:** `country_spec(CountryAlpha2,IBANLength,BBANPattern)` **Mode and number of proofs:** `country_spec(?atom,?integer,?list)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### iso_3166") **object** #### `iso_3166` Facade object for ISO 3166 code queries. **Availability:** `logtalk_load(iso_3166(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` iso_3166_protocol **Uses:** iso_3166_1 iso_3166_2 **Remarks:** (none) **Inherited public predicates:**  country/4  subdivision/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_3166_1` Generated ISO 3166-1 country facts extracted from the UN M49 overview page, which republishes ISO alpha-2 and alpha-3 codes together with M49 numeric codes. **Availability:** `logtalk_load(iso_3166(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Source URL: https://unstats.un.org/unsd/methodology/m49/overview/ > > - Generated entries: 248 **Inherited public predicates:** (none) - Public predicates - `country/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `country/4` Generated ISO 3166-1 country fact table. **Compilation flags:** `static` **Template:** `country(Alpha2,Alpha3,Numeric,Name)` **Mode and number of proofs:** `country(?atom,?atom,?integer,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `iso_3166_2` Generated ISO 3166-2 subdivision facts extracted from the Debian iso-codes machine-readable JSON snapshot. **Availability:** `logtalk_load(iso_3166(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Source URL: https://salsa.debian.org/iso-codes-team/iso-codes/-/raw/main/data/iso_3166-2.json > > - Generated entries: 5046 **Inherited public predicates:** (none) - Public predicates - `subdivision/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `subdivision/4` Generated ISO 3166-2 subdivision fact table. **Compilation flags:** `static` **Template:** `subdivision(Code,CountryAlpha2,Name,Category)` **Mode and number of proofs:** `subdivision(?atom,?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `iso_3166_protocol` Protocol for ISO 3166 country and subdivision registry lookups. **Availability:** `logtalk_load(iso_3166(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `country/4` - `subdivision/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `country/4` Enumerates ISO 3166-1 country entries as alpha-2, alpha-3, numeric, and English short name tuples. **Compilation flags:** `static` **Template:** `country(Alpha2,Alpha3,Numeric,Name)` **Mode and number of proofs:** `country(?atom,?atom,?integer,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `subdivision/4` Enumerates ISO 3166-2 subdivision entries as code, parent alpha-2 country code, name, and category tuples. **Compilation flags:** `static` **Template:** `subdivision(Code,CountryAlpha2,Name,Category)` **Mode and number of proofs:** `subdivision(?atom,?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### iso_4217") **object** #### `iso_4217` Generated ISO 4217 active currency and fund facts extracted from the SIX list-one.xml snapshot. **Availability:** `logtalk_load(iso_4217(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` iso_4217_protocol **Remarks:** > - Source publication: 2026-01-01 > > - Generated currency entries: 269 > > - Generated fund entries: 8 **Inherited public predicates:** (none) - Public predicates - `currency/5` - `fund_currency/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `currency/5` Generated ISO 4217 active non-fund currency fact table. **Compilation flags:** `static` **Template:** `currency(Alphabetic,Numeric,MinorUnit,Name,Entity)` **Mode and number of proofs:** `currency(?atom,?integer,?term,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `fund_currency/5` Generated ISO 4217 active fund currency fact table. **Compilation flags:** `static` **Template:** `fund_currency(Alphabetic,Numeric,MinorUnit,Name,Entity)` **Mode and number of proofs:** `fund_currency(?atom,?integer,?term,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `iso_4217_protocol` Protocol for ISO 4217 active currency and fund code lookups. **Availability:** `logtalk_load(iso_4217(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `currency/5` - `fund_currency/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `currency/5` Enumerates ISO 4217 active non-fund entries as alphabetic code, numeric code, minor unit, currency name, and entity tuples. The minor unit is either an integer or the atom `na` when the standard lists `N.A.`. **Compilation flags:** `static` **Template:** `currency(Alphabetic,Numeric,MinorUnit,Name,Entity)` **Mode and number of proofs:** `currency(?atom,?integer,?term,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `fund_currency/5` Enumerates ISO 4217 active fund entries as alphabetic code, numeric code, minor unit, currency name, and entity tuples. The minor unit is either an integer or the atom `na` when the standard lists `N.A.`. **Compilation flags:** `static` **Template:** `fund_currency(Alphabetic,Numeric,MinorUnit,Name,Entity)` **Mode and number of proofs:** `fund_currency(?atom,?integer,?term,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### iso_639") **object** #### `iso_639` Facade object for ISO 639 language and language-group queries. **Availability:** `logtalk_load(iso_639(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` iso_639_protocol **Uses:** iso_639_1 iso_639_2 iso_639_3 iso_639_5 **Remarks:** (none) **Inherited public predicates:**  language/3  language/5  language_code/5  language_group/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iso_639_1` Generated ISO 639-1 fact table. **Availability:** `logtalk_load(iso_639(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Source update: 2026-01-15 > > - Generated entries: 183 > > - Source: Library of Congress ISO 639-2 code list. **Inherited public predicates:** (none) - Public predicates - `language/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `language/3` Generated ISO 639-1 fact table. **Compilation flags:** `static` **Template:** `language(Alpha2,Alpha3,Name)` **Mode and number of proofs:** `language(?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `iso_639_2` Generated ISO 639-2 fact table. **Availability:** `logtalk_load(iso_639(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Source update: 2026-01-15 > > - Generated entries: 487 > > - Source: Library of Congress ISO 639-2 code list. **Inherited public predicates:** (none) - Public predicates - `language_code/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `language_code/5` Generated ISO 639-2 fact table. **Compilation flags:** `static` **Template:** `language_code(Bibliographic,Terminologic,Alpha2,Name,Class)` **Mode and number of proofs:** `language_code(?atom,?atom,?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `iso_639_3` Generated ISO 639-3 fact table. **Availability:** `logtalk_load(iso_639(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Source update: 2026-04-15 > > - Generated entries: 7929 > > - Source: SIL ISO 639-3 tab-delimited code set. **Inherited public predicates:** (none) - Public predicates - `language/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `language/5` Generated ISO 639-3 fact table. **Compilation flags:** `static` **Template:** `language(Alpha3,Alpha2,Scope,Type,Name)` **Mode and number of proofs:** `language(?atom,?atom,?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `iso_639_5` Generated ISO 639-5 fact table. **Availability:** `logtalk_load(iso_639(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Source update: 2026-04-15 > > - Generated entries: 115 > > - Source: Library of Congress ISO 639-5 identifier list. **Inherited public predicates:** (none) - Public predicates - `language_group/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `language_group/2` Generated ISO 639-5 fact table. **Compilation flags:** `static` **Template:** `language_group(Code,Name)` **Mode and number of proofs:** `language_group(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `iso_639_protocol` Protocol for ISO 639 language and language-group lookups. **Availability:** `logtalk_load(iso_639(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `language/3` - `language_code/5` - `language/5` - `language_group/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `language/3` Enumerates ISO 639-1 entries as alpha-2, alpha-3, and English name tuples. **Compilation flags:** `static` **Template:** `language(Alpha2,Alpha3,Name)` **Mode and number of proofs:** `language(?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `language_code/5` Enumerates ISO 639-2 entries as bibliographic code, terminologic code, alpha-2 code, English name, and class tuples. The class is one of `individual`, `macrolanguage`, `collective`, `special`, or `local_use`. **Compilation flags:** `static` **Template:** `language_code(Bibliographic,Terminologic,Alpha2,Name,Class)` **Mode and number of proofs:** `language_code(?atom,?atom,?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `language/5` Enumerates ISO 639-3 entries as alpha-3 code, alpha-2 code, scope, type, and English name tuples. The scope is one of `individual`, `macrolanguage`, `collective`, or `special` and the type is one of `living`, `extinct`, `ancient`, `constructed`, or `special`. **Compilation flags:** `static` **Template:** `language(Alpha3,Alpha2,Scope,Type,Name)` **Mode and number of proofs:** `language(?atom,?atom,?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `language_group/2` Enumerates ISO 639-5 entries as group code and English name tuples. **Compilation flags:** `static` **Template:** `language_group(Code,Name)` **Mode and number of proofs:** `language_group(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### iso_9362") **object** #### `iso_9362` ISO 9362 BIC parser and normalizer based on the public Swift and ISO 9362 structure definitions. **Availability:** `logtalk_load(iso_9362(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` iso_9362_protocol **Uses:** iso_3166 **Remarks:** (none) **Inherited public predicates:**  bic/5  canonical_bic/2  primary_office_bic/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `iso_9362_protocol` Protocol for ISO 9362 BIC structure parsing and normalization. **Availability:** `logtalk_load(iso_9362(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `bic/5` - `canonical_bic/2` - `primary_office_bic/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `bic/5` Parses and validates an ISO 9362 BIC atom into business party prefix, ISO 3166-1 alpha-2 country code, business party suffix, and branch identifier. Eight-character BICs are normalized to the primary-office branch code `XXX`. **Compilation flags:** `static` **Template:** `bic(BIC,Prefix,CountryAlpha2,Suffix,Branch)` **Mode and number of proofs:** `bic(+atom,?atom,?atom,?atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `canonical_bic/2` Returns the canonical 11-character form of a valid ISO 9362 BIC, using the branch code `XXX` when the input is an eight-character primary-office BIC. **Compilation flags:** `static` **Template:** `canonical_bic(BIC,Canonical)` **Mode and number of proofs:** `canonical_bic(+atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `primary_office_bic/1` True when a valid ISO 9362 BIC denotes the primary office, either because it is eight characters long or because its branch identifier is `XXX`. **Compilation flags:** `static` **Template:** `primary_office_bic(BIC)` **Mode and number of proofs:** `primary_office_bic(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### isolation_forest_anomaly_detector") **object** #### `isolation_forest_anomaly_detector` Extended Isolation Forest (EIF) algorithm for anomaly detection. Implements the improved version described by Hariri et al. (2019) that uses random hyperplane cuts instead of axis-aligned cuts, eliminating score bias artifacts. Builds an ensemble of isolation trees from baseline training examples selected from a dataset object implementing the `anomaly_dataset_protocol` protocol. Missing attribute values are represented using anonymous variables. **Availability:** `logtalk_load(isolation_forest_anomaly_detector(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` anomaly_detector_common **Uses:** fast_random(Algorithm) format integer list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - `score/3` - `score_all/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `score/3` Computes the anomaly score for a given instance using the learned model. The instance is a list of `Attribute-Value` pairs where missing values are represented using anonymous variables. The score is in the range `[0.0,`` ``1.0]`. Scores close to `1.0` indicate anomalies. Scores close to `0.5` or below indicate normal instances. **Compilation flags:** `static` **Template:** `score(Model,Instance,Score)` **Mode and number of proofs:** `score(+compound,+list,-float)` - `one` ------------------------------------------------------------------------ ###### `score_all/3` Computes the anomaly scores for all instances in the dataset. Returns a list of `Id-Class-Score` triples sorted by descending anomaly score. **Compilation flags:** `static` **Template:** `score_all(Dataset,Model,Scores)` **Mode and number of proofs:** `score_all(+object_identifier,+compound,-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_protocol, knn_distance_anomaly_detector, lof_anomaly_detector ### issue_creator") **object** #### `issue_creator` Support for automatically creating bug report issues for failed tests in GitHub or GitLab servers. **Availability:** `logtalk_load(issue_creator(loader))` **Author:** Paulo Moura **Version:** 0:12:1 **Date:** 2025-03-03 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** git os term_io user **Remarks:** > - Usage: This tool is automatically loaded and used from the `logtalk_tester` automation script when using its `-b` option. See the script man page for details. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### java") **object** #### `java` Abstract interface to JPL API utility predicates. **Availability:** `logtalk_load(java(loader))` **Author:** Paulo Moura **Version:** 1:8:0 **Date:** 2023-03-15 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` java_utils_protocol **Uses:** user **Remarks:** (none) **Inherited public predicates:**  array_list/2  array_to_list/2  array_to_terms/2  array_to_terms/3  decode_exception/2  decode_exception/3  false/1  is_false/1  is_null/1  is_object/1  is_true/1  is_void/1  iterator_element/2  list_to_array/2  map_element/2  null/1  set_element/2  terms_to_array/2  true/1  value_reference/2  void/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also java(Reference,ReturnValue), java(Reference), java_hook **object** #### `java(Reference)` - `Reference` - Either a class name or a Java reference to an object. Minimal abstraction of the JPL API for calling Java from Logtalk using familiar message-sending syntax and a `forward/1` handler to resolve methods. **Availability:** `logtalk_load(java(loader))` **Author:** Paulo Moura and Sergio Castro **Version:** 1:0:1 **Date:** 2019-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` java(Reference,\_) **Remarks:** > - Usage: Send to this object any valid message as listed in the JavaDocs for the given reference. **Inherited public predicates:**  forward/1  get_field/2  invoke/1  invoke/2  new/1  new/2  set_field/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also java(Reference,ReturnValue), java, java_hook **object** #### `java(Reference,ReturnValue)` - `Reference` - Either a class name or a Java reference to an object. - `ReturnValue` - Value returned by a method call (possibly the Java value void). Minimal abstraction of the JPL API for calling Java from Logtalk using familiar message-sending syntax and a `forward/1` handler to resolve methods. **Availability:** `logtalk_load(java(loader))` **Author:** Paulo Moura and Sergio Castro **Version:** 1:4:0 **Date:** 2023-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` forwarding `public` java_access_protocol **Remarks:** > - Usage: Send to this object any valid message as listed in the JavaDocs for the given reference. **Inherited public predicates:**  forward/1  get_field/2  invoke/1  invoke/2  new/1  new/2  set_field/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also java(Reference), java, java_hook **protocol** #### `java_access_protocol` Protocol for a minimal abstraction for calling Java from Logtalk using familiar message-sending syntax. **Availability:** `logtalk_load(java(loader))` **Author:** Paulo Moura and Sergio Castro **Version:** 1:2:1 **Date:** 2023-03-16 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `get_field/2` - `set_field/2` - `new/2` - `new/1` - `invoke/1` - `invoke/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `get_field/2` Gets the value of a class or object field. **Compilation flags:** `static` **Template:** `get_field(Field,Value)` **Mode and number of proofs:** `get_field(+atom,?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `set_field/2` Sets the value of a class or object field. **Compilation flags:** `static` **Template:** `set_field(Field,Value)` **Mode and number of proofs:** `set_field(+atom,+nonvar)` - `one` ------------------------------------------------------------------------ ###### `new/2` Creates a new instance using the specified parameter values. **Compilation flags:** `static` **Template:** `new(Parameters,Instance)` **Mode and number of proofs:** `new(+list(nonvar),-reference)` - `one` ------------------------------------------------------------------------ ###### `new/1` Creates a new instance using default parameter values. **Compilation flags:** `static` **Template:** `new(Instance)` **Mode and number of proofs:** `new(-reference)` - `one` ------------------------------------------------------------------------ ###### `invoke/1` Invokes a method. This is a more efficient compared with relying on the `forward/1` handler to resolve methods. **Compilation flags:** `static` **Template:** `invoke(Method)` **Mode and number of proofs:** `invoke(@nonvar)` - `one` ------------------------------------------------------------------------ ###### `invoke/2` Invokes a method. This is a more efficient compared with relying on the `forward/1` handler to resolve methods. **Compilation flags:** `static` **Template:** `invoke(Functor,Arguments)` **Mode and number of proofs:** `invoke(@nonvar,@list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `java_hook` Hook object to optimize messages to the `java/1-2` objects that otherwise would trigger the `forward/1` handler. **Availability:** `logtalk_load(java(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2019-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** > - Usage: Compile source files with messages to the `java/1-2` objects using the compiler option `hook(java_hook)`. **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also java(Reference,ReturnValue), java(Reference) **protocol** #### `java_utils_protocol` Abstract interface to Java utility predicates. **Availability:** `logtalk_load(java(loader))` **Author:** Paulo Moura **Version:** 1:6:0 **Date:** 2023-03-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `value_reference/2` - `true/1` - `false/1` - `void/1` - `null/1` - `is_true/1` - `is_false/1` - `is_void/1` - `is_null/1` - `is_object/1` - `terms_to_array/2` - `array_to_terms/3` - `array_to_terms/2` - `array_to_list/2` - `list_to_array/2` - `array_list/2` - `iterator_element/2` - `map_element/2` - `set_element/2` - `decode_exception/2` - `decode_exception/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `value_reference/2` Returns an opaque term that represents the Java value with the given name. **Compilation flags:** `static` **Template:** `value_reference(Value,Reference)` **Mode and number of proofs:** `value_reference(?atom,--ground)` - `one_or_more` ------------------------------------------------------------------------ ###### `true/1` Returns an opaque term that represents the Java value *true*. **Compilation flags:** `static` **Template:** `true(Reference)` **Mode and number of proofs:** `true(--ground)` - `one` ------------------------------------------------------------------------ ###### `false/1` Returns an opaque term that represents the Java value *false*. **Compilation flags:** `static` **Template:** `false(Reference)` **Mode and number of proofs:** `false(--ground)` - `one` ------------------------------------------------------------------------ ###### `void/1` Returns an opaque term that represents the Java value *void*. **Compilation flags:** `static` **Template:** `void(Reference)` **Mode and number of proofs:** `void(--ground)` - `one` ------------------------------------------------------------------------ ###### `null/1` Returns an opaque term that represents the Java value *null*. **Compilation flags:** `static` **Template:** `null(Reference)` **Mode and number of proofs:** `null(--ground)` - `one` ------------------------------------------------------------------------ ###### `is_true/1` True when the argument is the Java value *true*. Fails if the argument is not instantiated. **Compilation flags:** `static` **Template:** `is_true(Reference)` **Mode and number of proofs:** `is_true(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_false/1` True when the argument is the Java value *false*. Fails if the argument is not instantiated. **Compilation flags:** `static` **Template:** `is_false(Reference)` **Mode and number of proofs:** `is_false(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_void/1` True when the argument is the Java value *void*. Fails if the argument is not instantiated. **Compilation flags:** `static` **Template:** `is_void(Reference)` **Mode and number of proofs:** `is_void(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_null/1` True when the argument is the Java value *null*. Fails if the argument is not instantiated. **Compilation flags:** `static` **Template:** `is_null(Reference)` **Mode and number of proofs:** `is_null(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_object/1` True when the argument is a reference to a Java object. Fails if the argument is not instantiated. **Compilation flags:** `static` **Template:** `is_object(Reference)` **Mode and number of proofs:** `is_object(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `terms_to_array/2` Converts a list of ground Prolog terms to an array (a Java reference). **Compilation flags:** `static` **Template:** `terms_to_array(Terms,Array)` **Mode and number of proofs:** `terms_to_array(++list(ground),-array)` - `one` ------------------------------------------------------------------------ ###### `array_to_terms/3` Converts an array (a Java reference) to a list of ground Prolog terms returning also its length. The array elements must be atoms, integers, floats, or compound terms. Fails otherwise. **Compilation flags:** `static` **Template:** `array_to_terms(Array,Terms,Length)` **Mode and number of proofs:** `array_to_terms(+array,-list(ground),-integer)` - `one` ------------------------------------------------------------------------ ###### `array_to_terms/2` Converts an array (a Java reference) to a list of ground Prolog terms. The array elements must be atoms, integers, floats, or ground compound terms. Fails otherwise. **Compilation flags:** `static` **Template:** `array_to_terms(Array,Terms)` **Mode and number of proofs:** `array_to_terms(+array,-list(term))` - `one` ------------------------------------------------------------------------ ###### `array_to_list/2` Converts an array (a Java reference) to a list of Java references or their values. **Compilation flags:** `static` **Template:** `array_to_list(Array,List)` **Mode and number of proofs:** `array_to_list(+array,-list)` - `one` ------------------------------------------------------------------------ ###### `list_to_array/2` Converts a list of Java references or values to an array (a Java reference). **Compilation flags:** `static` **Template:** `list_to_array(List,Array)` **Mode and number of proofs:** `list_to_array(+list,-array)` - `one` ------------------------------------------------------------------------ ###### `array_list/2` Converts between an array (a Java reference) and a list of Java references or their values. Deprecated. Use the `array_to_list/2` and `list_to_array/2` predicates instead. **Compilation flags:** `static` **Template:** `array_list(Array,List)` **Mode and number of proofs:** `array_list(+array,-list)` - `one` `array_list(-array,+list)` - `one` ------------------------------------------------------------------------ ###### `iterator_element/2` Enumerates, by backtracking, all iterator elements. **Compilation flags:** `static` **Template:** `iterator_element(Iterator,Element)` **Mode and number of proofs:** `iterator_element(+iterator,-element)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map_element/2` Enumerates, by backtracking, all map elements. **Compilation flags:** `static` **Template:** `map_element(Map,Element)` **Mode and number of proofs:** `map_element(+iterator,-element)` - `zero_or_more` ------------------------------------------------------------------------ ###### `set_element/2` Enumerates, by backtracking, all set elements. **Compilation flags:** `static` **Template:** `set_element(Set,Element)` **Mode and number of proofs:** `set_element(+iterator,-element)` - `zero_or_more` ------------------------------------------------------------------------ ###### `decode_exception/2` Decodes an exception into its corresponding cause. Fails if the exception is not a Java exception. **Compilation flags:** `static` **Template:** `decode_exception(Exception,Cause)` **Mode and number of proofs:** `decode_exception(+callable,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `decode_exception/3` Decodes an exception into its corresponding cause and a stack trace. Fails if the exception is not a Java exception. **Compilation flags:** `static` **Template:** `decode_exception(Exception,Cause,StackTrace)` **Mode and number of proofs:** `decode_exception(+callable,-atom,-list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### json") **object** #### `json` JSON parser and generator. Uses curly terms for parsed JSON objects, dashes for parsed JSON pairs, and atoms for parsed JSON strings. **Availability:** `logtalk_load(json(loader))` **Author:** Paulo Moura and Jacinto Dávila **Version:** 1:1:0 **Date:** 2022-11-14 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json(curly,dash,atom) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json(StringRepresentation)` - `StringRepresentation` - Text representation to be used when decoding JSON strings. Possible values are `atom` (default), `chars`, and `codes`. JSON parser and generator. Uses curly terms for parsed JSON objects and dashes for parsed JSON pairs. **Availability:** `logtalk_load(json(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2022-11-14 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json(curly,dash,StringRepresentation) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json(ObjectRepresentation,PairRepresentation,StringRepresentation)` - `ObjectRepresentation` - Object representation to be used when decoding JSON objects. Possible values are `curly` (default) and `list`. - `PairRepresentation` - Pair representation to be used when decoding JSON objects. Possible values are `dash` (default), `equal`, and `colon`. - `StringRepresentation` - Text representation to be used when decoding JSON strings. Possible values are `atom` (default), `chars`, and `codes`. JSON parser and generator. **Availability:** `logtalk_load(json(loader))` **Author:** Paulo Moura and Jacinto Dávila **Version:** 1:0:0 **Date:** 2026-07-05 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` json_protocol **Uses:** reader **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `json_protocol` JSON parser and generator protocol. **Availability:** `logtalk_load(json(loader))` **Author:** Paulo Moura and Jacinto Dávila **Version:** 1:0:0 **Date:** 2026-07-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses the JSON contents read from the given source (`codes(List)`, `stream(Stream)`, `line(Stream)`, `file(Path)`, `chars(List)`, or `atom(Atom)`) into a term. **Compilation flags:** `static` **Template:** `parse(Source,Term)` **Mode and number of proofs:** `parse(++compound,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid JSON source term: `domain_error(json_source,Source)` `Source` is a valid JSON source term but does not contain parsable JSON: `domain_error(json,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates the content using the representation specified in the first argument (`codes(List)`, `stream(Stream)`, `file(Path)`, `chars(List)`, or `atom(Atom)`) for the term in the second argument. Fails if this term cannot be processed. **Compilation flags:** `static` **Template:** `generate(Sink,Term)` **Mode and number of proofs:** `generate(+compound,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid JSON sink term: `domain_error(json_sink,Sink)` A JSON version of `Term` cannot be generated by the implementation: `domain_error(json_term,Term)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### json_graph") **object** #### `json_graph` JSON Graph Format v2 parser and generator. **Availability:** `logtalk_load(json_graph(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-03 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` json_graph_protocol **Uses:** json list user **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `json_graph_data_protocol` Canonical JSON graph data protocol for object-backed graph sources and sinks using atom identifiers. **Availability:** `logtalk_load(json_graph(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-03 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `graph/2` - `node/3` - `edge/5` - `hyperedge/4` - `hyperedge/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `graph/2` Enumerates or stores graph properties for an atom graph identifier. **Compilation flags:** `dynamic` **Template:** `graph(GraphId,Properties)` **Mode and number of proofs:** `graph(?atom,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `node/3` Enumerates or stores node properties for atom graph and node identifiers. **Compilation flags:** `dynamic` **Template:** `node(GraphId,NodeId,Properties)` **Mode and number of proofs:** `node(?atom,?atom,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `edge/5` Enumerates or stores edge properties for atom graph, edge, source node, and target node identifiers. **Compilation flags:** `dynamic` **Template:** `edge(GraphId,EdgeId,Source,Target,Properties)` **Mode and number of proofs:** `edge(?atom,?atom,?atom,?atom,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `hyperedge/4` Enumerates or stores undirected hyperedge properties for atom graph and hyperedge identifiers and a list of atom node identifiers. **Compilation flags:** `dynamic` **Template:** `hyperedge(GraphId,HyperedgeId,Nodes,Properties)` **Mode and number of proofs:** `hyperedge(?atom,?atom,?list(atom),?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `hyperedge/5` Enumerates or stores directed hyperedge properties for atom graph and hyperedge identifiers and lists of atom source and target node identifiers. **Compilation flags:** `dynamic` **Template:** `hyperedge(GraphId,HyperedgeId,Sources,Targets,Properties)` **Mode and number of proofs:** `hyperedge(?atom,?atom,?list(atom),?list(atom),?list)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `json_graph_protocol` JSON Graph Format v2 parser and generator protocol. **Availability:** `logtalk_load(json_graph(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-03 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses the graph contents read from the given source (`codes(List)`, `stream(Stream)`, `file(Path)`, `chars(List)`, `atom(Atom)`, or `object(Object)`) into a list of canonical graph terms. Fails if the contents cannot be parsed. **Compilation flags:** `static` **Template:** `parse(Source,Terms)` **Mode and number of proofs:** `parse(++compound,--list)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid JSON graph source term: `domain_error(json_graph_source,Source)` `Source` is `object(Object)` but `Object` does not conform to the graph data protocol: `domain_error(json_graph_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates the graph contents using the representation specified in the first argument (`codes(List)`, `stream(Stream)`, `file(Path)`, `chars(List)`, `atom(Atom)`, or `object(Object)`) for the list of canonical graph terms in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Terms)` **Mode and number of proofs:** `generate(+compound,++list)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid JSON graph sink term: `domain_error(json_graph_sink,Sink)` `Terms` is neither a variable nor a valid list of canonical graph terms: `domain_error(json_graph_terms,Terms)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### json_ld") **object** #### `json_ld` JSON-LD 1.1 parser, generator, and processor. Uses curly terms for parsed JSON objects, dashes for parsed JSON pairs, and atoms for parsed JSON strings. **Availability:** `logtalk_load(json_ld(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json_ld(curly,dash,atom) **Remarks:** (none) **Inherited public predicates:**  compact/3  expand/2  flatten/2  frame/3  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json_ld(StringRepresentation)` - `StringRepresentation` - Text representation to be used when decoding JSON strings. Possible values are `atom` (default), `chars`, and `codes`. JSON-LD 1.1 parser, generator, and processor. Uses curly terms for parsed JSON objects and dashes for parsed JSON pairs. **Availability:** `logtalk_load(json_ld(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-05 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json_ld(curly,dash,StringRepresentation) **Remarks:** (none) **Inherited public predicates:**  compact/3  expand/2  flatten/2  frame/3  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json_ld(ObjectRepresentation,PairRepresentation,StringRepresentation)` - `ObjectRepresentation` - Object representation to be used when decoding JSON objects. Possible values are `curly` (default) and `list`. - `PairRepresentation` - Pair representation to be used when decoding JSON objects. Possible values are `dash` (default), `equal`, and `colon`. - `StringRepresentation` - Text representation to be used when decoding JSON strings. Possible values are `atom` (default), `chars`, and `codes`. JSON-LD 1.1 parser, generator, and processor. Builds on top of the `json` library for JSON parsing and generation. **Availability:** `logtalk_load(json_ld(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` json_ld_protocol **Uses:** json(ObjectRepresentation,PairRepresentation,StringRepresentation) list **Remarks:** (none) **Inherited public predicates:**  compact/3  expand/2  flatten/2  frame/3  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `json_ld_protocol` JSON-LD 1.1 parser, generator, and processor protocol. **Availability:** `logtalk_load(json_ld(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `expand/2` - `compact/3` - `flatten/2` - `frame/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a JSON-LD document from the given source (`file(Path)`, `stream(Stream)`, `codes(List)`, `chars(List)`, or `atom(Atom)`) into a term. **Compilation flags:** `static` **Template:** `parse(Source,Term)` **Mode and number of proofs:** `parse(++compound,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(json_ld_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates the content using the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(List)`, `chars(List)`, or `atom(Atom)`) for the term in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Term)` **Mode and number of proofs:** `generate(+compound,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` cannot be generated: `domain_error(json_ld_sink,Sink)` ------------------------------------------------------------------------ ###### `expand/2` Expands a parsed JSON-LD document. Expansion removes the context and represents all properties and types as full IRIs. The result is a list of node objects in expanded document form. **Compilation flags:** `static` **Template:** `expand(Document,Expanded)` **Mode and number of proofs:** `expand(+term,--list)` - `one_or_error` **Exceptions:** `Document` is a variable: `instantiation_error` ------------------------------------------------------------------------ ###### `compact/3` Compacts an expanded JSON-LD document using the given context. Compaction applies the context to shorten IRIs to terms or compact IRIs. **Compilation flags:** `static` **Template:** `compact(Document,Context,Compacted)` **Mode and number of proofs:** `compact(+term,+term,--term)` - `one_or_error` **Exceptions:** `Document` is a variable: `instantiation_error` `Context` is a variable: `instantiation_error` ------------------------------------------------------------------------ ###### `flatten/2` Flattens an expanded JSON-LD document. Flattening collects all node objects into a flat `@graph` array, with nested nodes replaced by references. Blank node identifiers are generated for nodes without `@id`. **Compilation flags:** `static` **Template:** `flatten(Document,Flattened)` **Mode and number of proofs:** `flatten(+term,--term)` - `one_or_error` **Exceptions:** `Document` is a variable: `instantiation_error` ------------------------------------------------------------------------ ###### `frame/3` Frames a JSON-LD document using the given frame. The result is an expanded framed document unless the frame provides a context, in which case the result is compacted with that context. **Compilation flags:** `static` **Template:** `frame(Document,Frame,Framed)` **Mode and number of proofs:** `frame(+term,+term,--term)` - `one_or_error` **Exceptions:** `Document` is a variable: `instantiation_error` `Frame` is a variable: `instantiation_error` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### json_lines") **object** #### `json_lines` JSON Lines parser and generator. Uses curly terms for parsed JSON objects, dashes for parsed JSON pairs, and atoms for parsed JSON strings. **Availability:** `logtalk_load(json_lines(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2025-05-27 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json_lines(curly,dash,atom) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json_lines(StringRepresentation)` - `StringRepresentation` - Text representation to be used when decoding JSON strings. Possible values are `atom` (default), `chars`, and `codes`. JSON Lines parser and generator. Uses curly terms for parsed JSON objects and dashes for parsed JSON pairs. **Availability:** `logtalk_load(json_lines(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2025-05-27 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json_lines(curly,dash,StringRepresentation) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json_lines(ObjectRepresentation,PairRepresentation,StringRepresentation)` - `ObjectRepresentation` - Object representation to be used when decoding JSON objects. Possible values are `curly` (default) and `list`. - `PairRepresentation` - Pair representation to be used when decoding JSON objects. Possible values are `dash` (default), `equal`, and `colon`. - `StringRepresentation` - Text representation to be used when decoding JSON strings. Possible values are `atom` (default), `chars`, and `codes`. JSON Lines parser and generator. **Availability:** `logtalk_load(json_lines(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` json_lines_protocol **Uses:** reader **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `json_lines_protocol` JSON Lines parser and generator protocol. **Availability:** `logtalk_load(json_lines(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses the JSON Lines contents read from the given source (`file(Path)`, `stream(Stream)`, `line(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a list of ground terms. **Compilation flags:** `static` **Template:** `parse(Source,Terms)` **Mode and number of proofs:** `parse(++compound,--list(ground))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(json_lines_source,Source)` `Source` contents are not valid JSON Lines: `domain_error(json_lines,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates the content using the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) for the list of ground terms in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Terms)` **Mode and number of proofs:** `generate(+compound,++list(ground))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Terms` is a variable: `instantiation_error` `Terms` is neither a variable nor a list: `type_error(list,Terms)` `Term` is a non-ground element of the list `Terms`: `instantiation_error` `Term` is an element of the list `Terms` but not a valid JSON term: `domain_error(json_term,Term)` `Sink` cannot be generated: `domain_error(json_lines_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### json_patch") **object** #### `json_patch` JSON Patch (RFC 6902) application predicates for native Logtalk JSON terms. **Availability:** `logtalk_load(json_patch(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-03 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` json_patch_protocol **Uses:** json_pointer list **Remarks:** (none) **Inherited public predicates:**  apply/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `json_patch_protocol` JSON Patch (RFC 6902) application protocol. **Availability:** `logtalk_load(json_patch(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-03 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `apply/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `apply/3` Applies a JSON Patch document represented as a list of operation objects to a JSON term and returns the patched JSON term. **Compilation flags:** `static` **Template:** `apply(Patch,OldJSON,NewJSON)` **Mode and number of proofs:** `apply(++list,++term,--term)` - `zero_or_one_or_error` **Exceptions:** `Patch` is a variable: `instantiation_error` `OldJSON` is a variable: `instantiation_error` `Patch` is neither a variable nor a list: `type_error(list,Patch)` An operation in `Patch` is malformed: `domain_error(json_patch_operation,Operation)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### json_path") **object** #### `json_path` JSONPath implementation using atoms for text representation. **Availability:** `logtalk_load(json_path(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2026-07-03 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json_path(atom) **Remarks:** (none) **Inherited public predicates:**  evaluate/3  generate/2  nodes/3  parse/2  paths/3  query/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json_path(StringRepresentation)` - `StringRepresentation` - Text representation to be used for query member names and normalized paths. Possible values are `atom` (default), `chars`, and `codes`. Initial JSONPath implementation supporting child and descendant navigation, names, wildcards, indexes, and slices. **Availability:** `logtalk_load(json_path(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-03 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` json_path_protocol **Uses:** list **Remarks:** (none) **Inherited public predicates:**  evaluate/3  generate/2  nodes/3  parse/2  paths/3  query/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `json_path_protocol` JSONPath parser, generator, and evaluator protocol. **Availability:** `logtalk_load(json_path(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-03 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `evaluate/3` - `paths/3` - `nodes/3` - `query/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a JSONPath query from the given source (`codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a parsed query term. Fails if the query cannot be parsed. **Compilation flags:** `static` **Template:** `parse(Source,Query)` **Mode and number of proofs:** `parse(++compound,--compound)` - `zero_or_one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(json_path_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates a JSONPath query using the representation specified in the first argument (`codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) for the parsed query term in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Query)` **Mode and number of proofs:** `generate(+compound,++compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Query` is neither a variable nor a valid parsed query term: `domain_error(json_path_query,Query)` `Sink` cannot be generated: `domain_error(json_path_sink,Sink)` ------------------------------------------------------------------------ ###### `evaluate/3` Evaluates a parsed JSONPath query against a JSON term and returns the selected values. **Compilation flags:** `static` **Template:** `evaluate(Query,JSON,Values)` **Mode and number of proofs:** `evaluate(++compound,++term,--list)` - `zero_or_one_or_error` **Exceptions:** `Query` is a variable: `instantiation_error` `JSON` is a variable: `instantiation_error` `Query` is neither a variable nor a valid parsed query term: `domain_error(json_path_query,Query)` ------------------------------------------------------------------------ ###### `paths/3` Evaluates a parsed JSONPath query against a JSON term and returns the selected normalized paths. **Compilation flags:** `static` **Template:** `paths(Query,JSON,Paths)` **Mode and number of proofs:** `paths(++compound,++term,--list)` - `zero_or_one_or_error` **Exceptions:** `Query` is a variable: `instantiation_error` `JSON` is a variable: `instantiation_error` `Query` is neither a variable nor a valid parsed query term: `domain_error(json_path_query,Query)` ------------------------------------------------------------------------ ###### `nodes/3` Evaluates a parsed JSONPath query against a JSON term and returns the selected nodes as `node(Path,`` ``Value)` terms. **Compilation flags:** `static` **Template:** `nodes(Query,JSON,Nodes)` **Mode and number of proofs:** `nodes(++compound,++term,--list)` - `zero_or_one_or_error` **Exceptions:** `Query` is a variable: `instantiation_error` `JSON` is a variable: `instantiation_error` `Query` is neither a variable nor a valid parsed query term: `domain_error(json_path_query,Query)` ------------------------------------------------------------------------ ###### `query/3` Parses a JSONPath query source and evaluates it against a JSON term, returning the selected values. **Compilation flags:** `static` **Template:** `query(Source,JSON,Values)` **Mode and number of proofs:** `query(++compound,++term,--list)` - `zero_or_one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `JSON` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(json_path_source,Source)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### json_pointer") **object** #### `json_pointer` JSON Pointer (RFC 6901) and Relative JSON Pointer parser, generator, and evaluator using atoms for text representation. **Availability:** `logtalk_load(json_pointer(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-04 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json_pointer(atom) **Remarks:** (none) **Inherited public predicates:**  evaluate/3  evaluate_relative/4  generate/2  generate_fragment/2  generate_relative/2  parse/2  parse_fragment/2  parse_relative/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json_pointer(StringRepresentation)` - `StringRepresentation` - Text representation to be used for reference tokens. Possible values are `atom` (default), `chars`, and `codes`. JSON Pointer (RFC 6901) and Relative JSON Pointer parser, generator, and evaluator. **Availability:** `logtalk_load(json_pointer(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-04 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` json_pointer_protocol **Uses:** list utf_8 **Remarks:** (none) **Inherited public predicates:**  evaluate/3  evaluate_relative/4  generate/2  generate_fragment/2  generate_relative/2  parse/2  parse_fragment/2  parse_relative/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `json_pointer_protocol` JSON Pointer (RFC 6901) and Relative JSON Pointer parser, generator, and evaluator protocol. **Availability:** `logtalk_load(json_pointer(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-04 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `parse_fragment/2` - `generate_fragment/2` - `parse_relative/2` - `generate_relative/2` - `evaluate/3` - `evaluate_relative/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a JSON Pointer from the given source (`codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a list of reference tokens. Fails if the pointer cannot be parsed. **Compilation flags:** `static` **Template:** `parse(Source,Pointer)` **Mode and number of proofs:** `parse(++compound,--list(ground))` - `zero_or_one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(json_pointer_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates a JSON Pointer using the representation specified in the first argument (`codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) for the list of reference tokens in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,Pointer)` **Mode and number of proofs:** `generate(+compound,++list(ground))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Pointer` is neither a variable nor a list: `type_error(list,Pointer)` `Pointer` contains an invalid reference token: `domain_error(json_pointer_token,Token)` `Sink` cannot be generated: `domain_error(json_pointer_sink,Sink)` ------------------------------------------------------------------------ ###### `parse_fragment/2` Parses a URI fragment representation of a JSON Pointer from the given source (`codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a list of reference tokens. Fails if the fragment cannot be parsed. **Compilation flags:** `static` **Template:** `parse_fragment(Source,Pointer)` **Mode and number of proofs:** `parse_fragment(++compound,--list(ground))` - `zero_or_one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(json_pointer_fragment_source,Source)` ------------------------------------------------------------------------ ###### `generate_fragment/2` Generates the URI fragment representation of a JSON Pointer using the representation specified in the first argument (`codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) for the list of reference tokens in the second argument. **Compilation flags:** `static` **Template:** `generate_fragment(Sink,Pointer)` **Mode and number of proofs:** `generate_fragment(+compound,++list(ground))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Pointer` is neither a variable nor a list: `type_error(list,Pointer)` `Pointer` contains an invalid reference token: `domain_error(json_pointer_token,Token)` `Sink` cannot be generated: `domain_error(json_pointer_fragment_sink,Sink)` ------------------------------------------------------------------------ ###### `parse_relative/2` Parses a Relative JSON Pointer from the given source (`codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a canonical term `relative(Up,`` ``Shift,`` ``Suffix)` where `Up` is the number of ancestor steps, `Shift` is the optional array index adjustment, and `Suffix` is either a list of reference tokens or the atom `'#'`. **Compilation flags:** `static` **Template:** `parse_relative(Source,RelativePointer)` **Mode and number of proofs:** `parse_relative(++compound,--compound)` - `zero_or_one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(json_relative_pointer_source,Source)` ------------------------------------------------------------------------ ###### `generate_relative/2` Generates a Relative JSON Pointer using the representation specified in the first argument (`codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) from a canonical term `relative(Up,`` ``Shift,`` ``Suffix)` where `Suffix` is either a list of reference tokens or the atom `'#'`. **Compilation flags:** `static` **Template:** `generate_relative(Sink,RelativePointer)` **Mode and number of proofs:** `generate_relative(+compound,++compound)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `RelativePointer` is not a valid Relative JSON Pointer term: `domain_error(json_relative_pointer,RelativePointer)` `RelativePointer` contains an invalid reference token: `domain_error(json_pointer_token,Token)` `Sink` cannot be generated: `domain_error(json_relative_pointer_sink,Sink)` ------------------------------------------------------------------------ ###### `evaluate/3` Evaluates a parsed JSON Pointer against a JSON term. Fails if the pointer does not identify a value in the given JSON term. **Compilation flags:** `static` **Template:** `evaluate(Pointer,JSON,Value)` **Mode and number of proofs:** `evaluate(++list(ground),++term,?term)` - `zero_or_one_or_error` **Exceptions:** `Pointer` is a variable: `instantiation_error` `JSON` is a variable: `instantiation_error` `Pointer` is neither a variable nor a list: `type_error(list,Pointer)` `Pointer` contains an invalid reference token: `domain_error(json_pointer_token,Token)` ------------------------------------------------------------------------ ###### `evaluate_relative/4` Evaluates a parsed Relative JSON Pointer term against a JSON term, using the second argument as the absolute JSON Pointer to the current context value. Fails if either the context or the relative pointer does not identify a value in the given JSON term. **Compilation flags:** `static` **Template:** `evaluate_relative(RelativePointer,Context,JSON,Value)` **Mode and number of proofs:** `evaluate_relative(++compound,++list(ground),++term,?term)` - `zero_or_one_or_error` **Exceptions:** `RelativePointer` is a variable: `instantiation_error` `Context` is a variable: `instantiation_error` `JSON` is a variable: `instantiation_error` `RelativePointer` is not a valid Relative JSON Pointer term: `domain_error(json_relative_pointer,RelativePointer)` `Context` is neither a variable nor a list: `type_error(list,Context)` `Context` or `RelativePointer` contains an invalid reference token: `domain_error(json_pointer_token,Token)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### json_rpc") **object** #### `json_rpc` JSON-RPC 2.0 protocol encoding and decoding. Provides predicates for constructing and parsing JSON-RPC 2.0 request, notification, response, and error objects. Uses the `json` library for JSON parsing and generation. **Availability:** `logtalk_load(json_rpc(loader))` **Author:** Paulo Moura **Version:** 1:0:4 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** json list reader **Remarks:** > - Specification: Implements the JSON-RPC 2.0 specification (https://www.jsonrpc.org/specification). > > - JSON representation: Uses the `json` library default representation: curly terms for objects, dashes for pairs, and atoms for strings. > > - Request: A JSON-RPC 2.0 request is represented as `{jsonrpc-'2.0',`` ``method-Method,`` ``params-Params,`` ``id-Id}`. > > - Notification: A JSON-RPC 2.0 notification is represented as `{jsonrpc-'2.0',`` ``method-Method,`` ``params-Params}`. > > - Successful response: A JSON-RPC 2.0 successful response is represented as `{jsonrpc-'2.0',`` ``result-Result,`` ``id-Id}`. > > - Error response: A JSON-RPC 2.0 error response is represented as `{jsonrpc-'2.0',`` ``error-{code-Code,`` ``message-Message},`` ``id-Id}` or `{jsonrpc-'2.0',`` ``error-{code-Code,`` ``message-Message,`` ``data-Data},`` ``id-Id}`. > > - Batch request: A JSON-RPC 2.0 batch request is represented as a list of request and/or notification terms. > > - Error codes: Standard error codes: -32700 (parse error), -32600 (invalid request), -32601 (method not found), -32602 (invalid params), -32603 (internal error). Server errors: -32000 to -32099. **Inherited public predicates:** (none) - Public predicates - `request/4` - `request/3` - `notification/3` - `notification/2` - `response/3` - `error_response/4` - `error_response/5` - `parse_error/1` - `invalid_request/1` - `method_not_found/2` - `invalid_params/2` - `internal_error/2` - `encode/2` - `decode/2` - `is_request/1` - `is_notification/1` - `is_response/1` - `is_error_response/1` - `is_batch/1` - `id/2` - `method/2` - `params/2` - `result/2` - `error/2` - `error_code/2` - `error_message/2` - `error_data/2` - `write_message/2` - `read_message/2` - `write_framed_message/2` - `read_framed_message/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `request/4` Constructs a JSON-RPC 2.0 request term. **Compilation flags:** `static` **Template:** `request(Method,Params,Id,Request)` **Mode and number of proofs:** `request(+atom,+list,+nonvar,--compound)` - `one` ------------------------------------------------------------------------ ###### `request/3` Constructs a JSON-RPC 2.0 request term with no parameters. **Compilation flags:** `static` **Template:** `request(Method,Id,Request)` **Mode and number of proofs:** `request(+atom,+nonvar,--compound)` - `one` ------------------------------------------------------------------------ ###### `notification/3` Constructs a JSON-RPC 2.0 notification term (a request without an id). **Compilation flags:** `static` **Template:** `notification(Method,Params,Notification)` **Mode and number of proofs:** `notification(+atom,+list,--compound)` - `one` ------------------------------------------------------------------------ ###### `notification/2` Constructs a JSON-RPC 2.0 notification term with no parameters. **Compilation flags:** `static` **Template:** `notification(Method,Notification)` **Mode and number of proofs:** `notification(+atom,--compound)` - `one` ------------------------------------------------------------------------ ###### `response/3` Constructs a JSON-RPC 2.0 successful response term. **Compilation flags:** `static` **Template:** `response(Result,Id,Response)` **Mode and number of proofs:** `response(+nonvar,+nonvar,--compound)` - `one` ------------------------------------------------------------------------ ###### `error_response/4` Constructs a JSON-RPC 2.0 error response term with a null id (used when the request id cannot be determined). **Compilation flags:** `static` **Template:** `error_response(Code,Message,Id,ErrorResponse)` **Mode and number of proofs:** `error_response(+integer,+atom,+nonvar,--compound)` - `one` ------------------------------------------------------------------------ ###### `error_response/5` Constructs a JSON-RPC 2.0 error response term with additional error data. **Compilation flags:** `static` **Template:** `error_response(Code,Message,Data,Id,ErrorResponse)` **Mode and number of proofs:** `error_response(+integer,+atom,+nonvar,+nonvar,--compound)` - `one` ------------------------------------------------------------------------ ###### `parse_error/1` Constructs a JSON-RPC 2.0 parse error response (-32700) with a null id. **Compilation flags:** `static` **Template:** `parse_error(ErrorResponse)` **Mode and number of proofs:** `parse_error(--compound)` - `one` ------------------------------------------------------------------------ ###### `invalid_request/1` Constructs a JSON-RPC 2.0 invalid request error response (-32600) with a null id. **Compilation flags:** `static` **Template:** `invalid_request(ErrorResponse)` **Mode and number of proofs:** `invalid_request(--compound)` - `one` ------------------------------------------------------------------------ ###### `method_not_found/2` Constructs a JSON-RPC 2.0 method not found error response (-32601). **Compilation flags:** `static` **Template:** `method_not_found(Id,ErrorResponse)` **Mode and number of proofs:** `method_not_found(+nonvar,--compound)` - `one` ------------------------------------------------------------------------ ###### `invalid_params/2` Constructs a JSON-RPC 2.0 invalid params error response (-32602). **Compilation flags:** `static` **Template:** `invalid_params(Id,ErrorResponse)` **Mode and number of proofs:** `invalid_params(+nonvar,--compound)` - `one` ------------------------------------------------------------------------ ###### `internal_error/2` Constructs a JSON-RPC 2.0 internal error response (-32603). **Compilation flags:** `static` **Template:** `internal_error(Id,ErrorResponse)` **Mode and number of proofs:** `internal_error(+nonvar,--compound)` - `one` ------------------------------------------------------------------------ ###### `encode/2` Encodes a JSON-RPC 2.0 term (request, notification, response, error, or batch) into a JSON atom. **Compilation flags:** `static` **Template:** `encode(Term,JSON)` **Mode and number of proofs:** `encode(+compound,--atom)` - `one` ------------------------------------------------------------------------ ###### `decode/2` Decodes a JSON atom into a JSON-RPC 2.0 term (request, notification, response, error, or batch). **Compilation flags:** `static` **Template:** `decode(JSON,Term)` **Mode and number of proofs:** `decode(+atom,--compound)` - `one_or_error` **Exceptions:** `JSON` is a variable: `instantiation_error` `JSON` is neither a variable nor a valid JSON atom term or does not contain parsable JSON by the implementation: `domain_error(json_source,JSON)` ------------------------------------------------------------------------ ###### `is_request/1` True if the term is a valid JSON-RPC 2.0 request (has jsonrpc, method, and id fields). **Compilation flags:** `static` **Template:** `is_request(Term)` **Mode and number of proofs:** `is_request(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_notification/1` True if the term is a valid JSON-RPC 2.0 notification (has jsonrpc and method fields but no id field). **Compilation flags:** `static` **Template:** `is_notification(Term)` **Mode and number of proofs:** `is_notification(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_response/1` True if the term is a valid JSON-RPC 2.0 successful response (has jsonrpc, result, and id fields). **Compilation flags:** `static` **Template:** `is_response(Term)` **Mode and number of proofs:** `is_response(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_error_response/1` True if the term is a valid JSON-RPC 2.0 error response (has jsonrpc, error, and id fields). **Compilation flags:** `static` **Template:** `is_error_response(Term)` **Mode and number of proofs:** `is_error_response(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_batch/1` True if the term is a valid JSON-RPC 2.0 batch (a non-empty list). **Compilation flags:** `static` **Template:** `is_batch(Term)` **Mode and number of proofs:** `is_batch(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `id/2` Extracts the id field from a JSON-RPC 2.0 message. **Compilation flags:** `static` **Template:** `id(Message,Id)` **Mode and number of proofs:** `id(+compound,--nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `method/2` Extracts the method field from a JSON-RPC 2.0 request or notification. **Compilation flags:** `static` **Template:** `method(Message,Method)` **Mode and number of proofs:** `method(+compound,--atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `params/2` Extracts the params field from a JSON-RPC 2.0 request or notification. **Compilation flags:** `static` **Template:** `params(Message,Params)` **Mode and number of proofs:** `params(+compound,--nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `result/2` Extracts the result field from a JSON-RPC 2.0 response. **Compilation flags:** `static` **Template:** `result(Message,Result)` **Mode and number of proofs:** `result(+compound,--nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `error/2` Extracts the error field from a JSON-RPC 2.0 error response. **Compilation flags:** `static` **Template:** `error(Message,Error)` **Mode and number of proofs:** `error(+compound,--compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `error_code/2` Extracts the error code from a JSON-RPC 2.0 error response. **Compilation flags:** `static` **Template:** `error_code(Message,Code)` **Mode and number of proofs:** `error_code(+compound,--integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `error_message/2` Extracts the error message from a JSON-RPC 2.0 error response. **Compilation flags:** `static` **Template:** `error_message(Message,ErrorMessage)` **Mode and number of proofs:** `error_message(+compound,--atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `error_data/2` Extracts the error data from a JSON-RPC 2.0 error response. Fails if no data field is present. **Compilation flags:** `static` **Template:** `error_data(Message,Data)` **Mode and number of proofs:** `error_data(+compound,--nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `write_message/2` Writes a JSON-RPC 2.0 message to an output text stream as a single line of JSON followed by a newline. Flushes the output stream after writing. **Compilation flags:** `static` **Template:** `write_message(Output,Message)` **Mode and number of proofs:** `write_message(+stream,+compound)` - `one` ------------------------------------------------------------------------ ###### `read_message/2` Reads a JSON-RPC 2.0 message from an input text stream. Reads a line of JSON text and parses it. Fails at end of stream. **Compilation flags:** `static` **Template:** `read_message(Input,Message)` **Mode and number of proofs:** `read_message(+stream,--compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `write_framed_message/2` Writes a JSON-RPC 2.0 message to an output stream using Content-Length framing (as used by LSP style protocols). The message is preceded by a `Content-Length:`` ``N\r\n\r\n` header where `N` is the byte length of the JSON body. Flushes the output stream after writing. **Compilation flags:** `static` **Template:** `write_framed_message(Output,Message)` **Mode and number of proofs:** `write_framed_message(+stream,+compound)` - `one` ------------------------------------------------------------------------ ###### `read_framed_message/2` Reads a JSON-RPC 2.0 message from an input stream using Content-Length framing (as used by LSP style protocols). Reads a `Content-Length:`` ``N\r\n\r\n` header followed by exactly `N` bytes of JSON body. Fails at end of stream or if the header is missing or malformed. **Compilation flags:** `static` **Template:** `read_framed_message(Input,Message)` **Mode and number of proofs:** `read_framed_message(+stream,--compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### json_schema") **object** #### `json_schema` JSON Schema parser and validator. Uses curly terms for JSON objects, dashes for JSON pairs, and atoms for JSON strings. **Availability:** `logtalk_load(json_schema(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-01-29 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json_schema(curly,dash,atom) **Remarks:** (none) **Inherited public predicates:**  parse/2  validate/2  validate/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json_schema(StringRepresentation)` - `StringRepresentation` - String representation used for JSON strings. Possible values are `atom` (default), `chars`, and `codes`. JSON Schema parser and validator. Uses curly terms for JSON objects and dashes for JSON pairs. **Availability:** `logtalk_load(json_schema(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-01-29 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` json_schema(curly,dash,StringRepresentation) **Remarks:** (none) **Inherited public predicates:**  parse/2  validate/2  validate/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `json_schema(ObjectRepresentation,PairRepresentation,StringRepresentation)` - `ObjectRepresentation` - Object representation used for JSON objects. Possible values are `curly` (default) and `list`. - `PairRepresentation` - Pair representation used for JSON object pairs. Possible values are `dash` (default), `equal`, and `colon`. - `StringRepresentation` - String representation used for JSON strings. Possible values are `atom` (default), `chars`, and `codes`. JSON Schema parser and validator supporting JSON Schema draft-07/draft-2019-09/draft-2020-12. **Availability:** `logtalk_load(json_schema(loader))` **Author:** Paulo Moura **Version:** 1:4:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` json_schema_protocol **Uses:** json(ObjectRepresentation,PairRepresentation,StringRepresentation) json_pointer(StringRepresentation) list os url(Representation) **Remarks:** (none) **Inherited public predicates:**  parse/2  validate/2  validate/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `json_schema_protocol` JSON Schema parser and validator protocol. **Availability:** `logtalk_load(json_schema(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-14 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `validate/2` - `validate/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a JSON schema from the given source (`file(Path)`, `stream(Stream)`, `codes(List)`, `chars(List)`, or `atom(Atom)`) into a schema term. **Compilation flags:** `static` **Template:** `parse(Source,Schema)` **Mode and number of proofs:** `parse(++compound,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid JSON source term or does not contain parsable JSON: `domain_error(json_source,Source)` The parsed JSON value is not a valid JSON Schema term: `domain_error(json_schema,Schema)` ------------------------------------------------------------------------ ###### `validate/2` Validates a JSON term against a parsed schema. Succeeds if the JSON term is valid according to the schema. **Compilation flags:** `static` **Template:** `validate(Schema,JSON)` **Mode and number of proofs:** `validate(+term,+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate/3` Validates a JSON term against a parsed schema. Returns a list of validation errors (empty list if valid). **Compilation flags:** `static` **Template:** `validate(Schema,JSON,Errors)` **Mode and number of proofs:** `validate(+term,+term,--list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### jwt") **object** #### `jwt` Facade predicates for parsing, signing, verifying, and validating JSON Web Tokens. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` jwt_helpers **Uses:** jwt_claims jwt_compact jwt_jwa jwt_jwks jwt_jws **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `decode/3` - `decode/5` - `header/2` - `claims/2` - `claim/3` - `peek_algorithm/2` - `peek_key_id/2` - `verify/4` - `verify/5` - `verify_signature/5` - `sign/5` - `sign_payload/5` - `validate_claims/3` - `validate_claim/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `decode/3` Decodes a compact JWT into header and claims JSON terms without verifying the signature. **Compilation flags:** `static` **Template:** `decode(Token,Header,Claims)` **Mode and number of proofs:** `decode(+atom,-term,-term)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `decode/5` Decodes a compact JWT into header, claims, signature bytes, and signing input. **Compilation flags:** `static` **Template:** `decode(Token,Header,Claims,Signature,SigningInput)` **Mode and number of proofs:** `decode(+atom,-term,-term,-list(byte),-atom)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `header/2` Decodes only the JWT header JSON term. **Compilation flags:** `static` **Template:** `header(Token,Header)` **Mode and number of proofs:** `header(+atom,-term)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `claims/2` Decodes only the JWT claims JSON term. **Compilation flags:** `static` **Template:** `claims(Token,Claims)` **Mode and number of proofs:** `claims(+atom,-term)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `claim/3` Looks up a claim value by name in a claims JSON term. **Compilation flags:** `static` **Template:** `claim(Claims,Name,Value)` **Mode and number of proofs:** `claim(+term,+atom,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `peek_algorithm/2` Decodes the JWT header and returns its algorithm. **Compilation flags:** `static` **Template:** `peek_algorithm(Token,Algorithm)` **Mode and number of proofs:** `peek_algorithm(+atom,-atom)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` The decoded JWT header does not contain a valid `alg` member: `domain_error(jwt_header,Header)` ------------------------------------------------------------------------ ###### `peek_key_id/2` Decodes the JWT header and returns its optional key identifier. **Compilation flags:** `static` **Template:** `peek_key_id(Token,KeyId)` **Mode and number of proofs:** `peek_key_id(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `verify/4` Verifies a compact JWT using a key or JWK Set and returns the claims. **Compilation flags:** `static` **Template:** `verify(Token,KeyOrJWKSet,Claims,Options)` **Mode and number of proofs:** `verify(+atom,+term,-term,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` The decoded JWT header does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` `KeyOrJWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,KeyOrJWKSet)` No compatible key exists for the JWT header: `existence_error(jwt_jwk,Header)` `KeyOrJWKSet` is not a valid symmetric key: `domain_error(jwt_symmetric_key,KeyOrJWKSet)` `KeyOrJWKSet` is not a supported public JWK: `domain_error(jwt_jwk_public_key,KeyOrJWKSet)` The ES256 signature is not 64 bytes long: `domain_error(jwt_es256_signature,Signature)` The OpenSSL executable does not exist: `existence_error(os_command,Executable)` A required claim is missing: `domain_error(jwt_claims,missing(Name))` A claim has an invalid value: `domain_error(jwt_claim(Name),Value)` A time claim value is not a number: `type_error(time_number,Name-Time)` ------------------------------------------------------------------------ ###### `verify/5` Verifies a compact JWT using a key or JWK Set and returns the header and claims. **Compilation flags:** `static` **Template:** `verify(Token,Header,Claims,KeyOrJWKSet,Options)` **Mode and number of proofs:** `verify(+atom,-term,-term,+term,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` The decoded JWT header does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` `KeyOrJWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,KeyOrJWKSet)` No compatible key exists for the JWT header: `existence_error(jwt_jwk,Header)` `KeyOrJWKSet` is not a valid symmetric key: `domain_error(jwt_symmetric_key,KeyOrJWKSet)` `KeyOrJWKSet` is not a supported public JWK: `domain_error(jwt_jwk_public_key,KeyOrJWKSet)` The ES256 signature is not 64 bytes long: `domain_error(jwt_es256_signature,Signature)` The OpenSSL executable does not exist: `existence_error(os_command,Executable)` A required claim is missing: `domain_error(jwt_claims,missing(Name))` A claim has an invalid value: `domain_error(jwt_claim(Name),Value)` A time claim value is not a number: `type_error(time_number,Name-Time)` ------------------------------------------------------------------------ ###### `verify_signature/5` Verifies a JWS signature for a signing input, algorithm, key, and options. **Compilation flags:** `static` **Template:** `verify_signature(Algorithm,SigningInput,Signature,Key,Options)` **Mode and number of proofs:** `verify_signature(+atom,+atom,+list(byte),+term,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Algorithm` is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` `Key` is not a valid symmetric key: `domain_error(jwt_symmetric_key,Key)` `Key` is not a supported public JWK: `domain_error(jwt_jwk_public_key,Key)` `Signature` is not a 64-byte raw ES256 signature: `domain_error(jwt_es256_signature,Signature)` The OpenSSL executable does not exist: `existence_error(os_command,Executable)` ------------------------------------------------------------------------ ###### `sign/5` Signs claims as a compact JWT using the given header, key, and options. **Compilation flags:** `static` **Template:** `sign(Header,Claims,Key,Token,Options)` **Mode and number of proofs:** `sign(+term,+term,+term,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Header` does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` `Header` or `Claims` cannot be encoded as JSON: `domain_error(json_sink,HeaderOrClaims)` `Key` is not a valid symmetric key: `domain_error(jwt_symmetric_key,Key)` `Algorithm` is not a supported signing algorithm: `domain_error(jwt_signing_algorithm,Algorithm)` ------------------------------------------------------------------------ ###### `sign_payload/5` Signs a payload JSON term as a compact JWS using the given header, key, and options. **Compilation flags:** `static` **Template:** `sign_payload(Header,Payload,Key,Token,Options)` **Mode and number of proofs:** `sign_payload(+term,+term,+term,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Header` does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` `Header` or `Payload` cannot be encoded as JSON: `domain_error(json_sink,HeaderOrPayload)` `Key` is not a valid symmetric key: `domain_error(jwt_symmetric_key,Key)` `Algorithm` is not a supported signing algorithm: `domain_error(jwt_signing_algorithm,Algorithm)` ------------------------------------------------------------------------ ###### `validate_claims/3` Validates JWT claims using registered-claim defaults, a policy list, and options. **Compilation flags:** `static` **Template:** `validate_claims(Claims,Policy,Options)` **Mode and number of proofs:** `validate_claims(+term,+list(compound),+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` A required claim is missing: `domain_error(jwt_claims,missing(Name))` A claim has an invalid value: `domain_error(jwt_claim(Name),Value)` `Policy` contains an invalid claim policy: `domain_error(jwt_claim_policy,Policy)` A time claim value is not a number: `type_error(time_number,Name-Time)` `Policy` contains an invalid time-claim kind: `domain_error(jwt_time_claim_kind,Kind)` ------------------------------------------------------------------------ ###### `validate_claim/3` Validates a single JWT claim policy against a claims JSON term. **Compilation flags:** `static` **Template:** `validate_claim(Claims,ClaimPolicy,Options)` **Mode and number of proofs:** `validate_claim(+term,+compound,+list(compound))` - `one_or_error` **Exceptions:** A required claim is missing: `domain_error(jwt_claims,missing(Name))` A claim has an invalid value: `domain_error(jwt_claim(Name),Value)` `ClaimPolicy` is not a valid claim policy: `domain_error(jwt_claim_policy,ClaimPolicy)` A time claim value is not a number: `type_error(time_number,Name-Time)` `ClaimPolicy` contains an invalid time-claim kind: `domain_error(jwt_time_claim_kind,Kind)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `jwt_claims` Reusable JWT registered-claim validation helpers. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` jwt_helpers **Uses:** list os **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `validate_claims/3` - `validate_claim/3` - `claim/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `validate_claims/3` Validates JWT claims using registered-claim defaults, a policy list, and options. **Compilation flags:** `static` **Template:** `validate_claims(Claims,Policy,Options)` **Mode and number of proofs:** `validate_claims(+term,+list(compound),+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` A required claim is missing: `domain_error(jwt_claims,missing(Name))` A claim has an invalid value: `domain_error(jwt_claim(Name),Value)` `Policy` contains an invalid claim policy: `domain_error(jwt_claim_policy,Policy)` A time claim value is not a number: `type_error(time_number,Name-Time)` `Policy` contains an invalid time-claim kind: `domain_error(jwt_time_claim_kind,Kind)` ------------------------------------------------------------------------ ###### `validate_claim/3` Validates a single JWT claim policy against a claims JSON term. **Compilation flags:** `static` **Template:** `validate_claim(Claims,ClaimPolicy,Options)` **Meta-predicate template:** `validate_claim(*,*,*)` **Mode and number of proofs:** `validate_claim(+term,+compound,+list(compound))` - `one_or_error` **Exceptions:** A required claim is missing: `domain_error(jwt_claims,missing(Name))` A claim has an invalid value: `domain_error(jwt_claim(Name),Value)` `ClaimPolicy` is not a valid claim policy: `domain_error(jwt_claim_policy,ClaimPolicy)` A time claim value is not a number: `type_error(time_number,Name-Time)` `ClaimPolicy` contains an invalid time-claim kind: `domain_error(jwt_time_claim_kind,Kind)` ------------------------------------------------------------------------ ###### `claim/3` Looks up a claim value by name in a claims JSON term. **Compilation flags:** `static` **Template:** `claim(Claims,Name,Value)` **Mode and number of proofs:** `claim(+term,+atom,-term)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `jwt_compact` JWT compact serialization parsing and generation helpers. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` jwt_helpers **Uses:** atom json user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `decode/3` - `decode/5` - `header/2` - `claims/2` - `segments/5` - `signing_input/4` - `compact/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `decode/3` Decodes a compact JWT into header and claims JSON terms without verifying the signature. **Compilation flags:** `static` **Template:** `decode(Token,Header,Claims)` **Mode and number of proofs:** `decode(+atom,-term,-term)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `decode/5` Decodes a compact JWT into header, claims, signature bytes, and signing input. **Compilation flags:** `static` **Template:** `decode(Token,Header,Claims,Signature,SigningInput)` **Mode and number of proofs:** `decode(+atom,-term,-term,-list(byte),-atom)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `header/2` Decodes only the JWT header JSON term. **Compilation flags:** `static` **Template:** `header(Token,Header)` **Mode and number of proofs:** `header(+atom,-term)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `claims/2` Decodes only the JWT claims JSON term. **Compilation flags:** `static` **Template:** `claims(Token,Claims)` **Mode and number of proofs:** `claims(+atom,-term)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `segments/5` Splits a compact JWT into Base64URL segments and signing input. **Compilation flags:** `static` **Template:** `segments(Token,HeaderSegment,PayloadSegment,SignatureSegment,SigningInput)` **Mode and number of proofs:** `segments(+atom,-atom,-atom,-atom,-atom)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` ------------------------------------------------------------------------ ###### `signing_input/4` Encodes header and payload JSON terms and returns the compact signing input. **Compilation flags:** `static` **Template:** `signing_input(Header,Payload,HeaderSegment,SigningInput)` **Mode and number of proofs:** `signing_input(+term,+term,-atom,-atom)` - `one_or_error` **Exceptions:** `Header` or `Payload` cannot be encoded as JSON: `domain_error(json_sink,HeaderOrPayload)` `Header` or `Payload` cannot be encoded as Base64URL bytes: `domain_error(base64url_sink,codes(Codes))` ------------------------------------------------------------------------ ###### `compact/4` Builds a compact JWT from a signing input and signature bytes. **Compilation flags:** `static` **Template:** `compact(HeaderSegment,SigningInput,Signature,Token)` **Mode and number of proofs:** `compact(+atom,+atom,+list(byte),-atom)` - `one_or_error` **Exceptions:** `Signature` cannot be encoded as Base64URL bytes: `domain_error(base64url_sink,codes(Codes))` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `jwt_der` DER and PEM helpers for JWK public keys and JOSE signatures. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` jwt_helpers **Uses:** base64 list user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `public_key_pem/2` - `es256_signature_der/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `public_key_pem/2` Converts a supported JWK public key into PEM SubjectPublicKeyInfo text. **Compilation flags:** `static` **Template:** `public_key_pem(Key,PEM)` **Mode and number of proofs:** `public_key_pem(+term,-atom)` - `one_or_error` **Exceptions:** `Key` is not a supported RSA or P-256 EC public JWK: `domain_error(jwt_jwk_public_key,Key)` `Key` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `es256_signature_der/2` Converts a raw JOSE ES256 signature into DER-encoded ASN.1 form. **Compilation flags:** `static` **Template:** `es256_signature_der(Signature,DER)` **Mode and number of proofs:** `es256_signature_der(+list(byte),-list(byte))` - `one_or_error` **Exceptions:** `Signature` is not a 64-byte raw ES256 signature: `domain_error(jwt_es256_signature,Signature)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `jwt_helpers` Internal shared helpers for the jwt library. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static` **Extends:** `public` options **Uses:** base64url_no_padding list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `json_member/3` - `json_member_default/4` - `json_object_pairs/2` - `json_object/1` - `pair_key_value/3` - `base64url_atom_bytes/2` - `atom_bytes/2` - `bytes_atom/2` - `atom_list/1` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `json_member/3` Enumerates JSON object member values for a given key. **Compilation flags:** `static` **Template:** `json_member(Key,Object,Value)` **Mode and number of proofs:** `json_member(+atom,+term,-term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `json_member_default/4` Returns a JSON object member value or a default when the key is absent. **Compilation flags:** `static` **Template:** `json_member_default(Key,Object,Default,Value)` **Mode and number of proofs:** `json_member_default(+atom,+term,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `json_object_pairs/2` Extracts the key-value pairs from a JSON object term. **Compilation flags:** `static` **Template:** `json_object_pairs(Object,Pairs)` **Mode and number of proofs:** `json_object_pairs(+term,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `json_object/1` Validates that a JSON term is an object without duplicate member names. **Compilation flags:** `static` **Template:** `json_object(Object)` **Mode and number of proofs:** `json_object(+term)` - `one_or_error` **Exceptions:** `Object` is not a JSON object or contains duplicate member names: `domain_error(jwt_json_object,Object)` ------------------------------------------------------------------------ ###### `pair_key_value/3` Extracts the key and value from a JSON pair compound term. **Compilation flags:** `static` **Template:** `pair_key_value(Pair,Key,Value)` **Mode and number of proofs:** `pair_key_value(+compound,-term,-term)` - `one` ------------------------------------------------------------------------ ###### `base64url_atom_bytes/2` Converts between unpadded Base64URL atoms and byte lists. **Compilation flags:** `static` **Template:** `base64url_atom_bytes(Atom,Bytes)` **Mode and number of proofs:** `base64url_atom_bytes(+atom,-list(byte))` - `one_or_error` `base64url_atom_bytes(-atom,+list(byte))` - `one_or_error` **Exceptions:** `Atom` is a variable or the sink is a variable: `instantiation_error` `Atom` is neither a variable nor a valid Base64URL source term: `domain_error(base64url_source,codes(Codes))` `Bytes` cannot be encoded in the requested Base64URL sink representation: `domain_error(base64url_sink,codes(Codes))` `Atom` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `atom_bytes/2` Converts between an atom and its byte list representation. **Compilation flags:** `static` **Template:** `atom_bytes(Atom,Bytes)` **Mode and number of proofs:** `atom_bytes(+atom,-list(byte))` - `one` `atom_bytes(-atom,+list(byte))` - `one` ------------------------------------------------------------------------ ###### `bytes_atom/2` Converts a byte list into an atom. **Compilation flags:** `static` **Template:** `bytes_atom(Bytes,Atom)` **Mode and number of proofs:** `bytes_atom(+list(byte),-atom)` - `one` ------------------------------------------------------------------------ ###### `atom_list/1` Validates that a list contains only atoms. **Compilation flags:** `static` **Template:** `atom_list(Atoms)` **Mode and number of proofs:** `atom_list(+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `jwt_jwa` JSON Web Algorithm metadata and header helpers. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` jwt_helpers **Uses:** list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `header_algorithm/2` - `header_key_id/2` - `validate_header/1` - `allowed_algorithm/2` - `supported_algorithm/1` - `key_type/2` - `hmac_hash/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `header_algorithm/2` Extracts and validates the JWT header algorithm. **Compilation flags:** `static` **Template:** `header_algorithm(Header,Algorithm)` **Mode and number of proofs:** `header_algorithm(+term,-atom)` - `one_or_error` **Exceptions:** `Header` does not contain a valid `alg` member: `domain_error(jwt_header,Header)` ------------------------------------------------------------------------ ###### `header_key_id/2` Extracts the optional key identifier from a JWT header. **Compilation flags:** `static` **Template:** `header_key_id(Header,KeyId)` **Mode and number of proofs:** `header_key_id(+term,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate_header/1` Validates a JWT header object and rejects unsupported critical header parameters. **Compilation flags:** `static` **Template:** `validate_header(Header)` **Mode and number of proofs:** `validate_header(+term)` - `one_or_error` **Exceptions:** `Header` is not a JSON object, contains duplicate member names, or contains unsupported critical header parameters: `domain_error(jwt_header,Header)` ------------------------------------------------------------------------ ###### `allowed_algorithm/2` Validates that an algorithm is supported and allowed by the options. **Compilation flags:** `static` **Template:** `allowed_algorithm(Algorithm,Options)` **Mode and number of proofs:** `allowed_algorithm(+atom,+list(compound))` - `one_or_error` **Exceptions:** `Algorithm` is unsupported or disallowed by `Options`: `domain_error(jwt_algorithm,Algorithm)` ------------------------------------------------------------------------ ###### `supported_algorithm/1` Succeeds when the algorithm is supported by this library. **Compilation flags:** `static` **Template:** `supported_algorithm(Algorithm)` **Mode and number of proofs:** `supported_algorithm(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `key_type/2` Maps a supported algorithm to the required JWK key type. **Compilation flags:** `static` **Template:** `key_type(Algorithm,KeyType)` **Mode and number of proofs:** `key_type(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `hmac_hash/2` Maps a supported HMAC algorithm to its hash object. **Compilation flags:** `static` **Template:** `hmac_hash(Algorithm,Hash)` **Mode and number of proofs:** `hmac_hash(+atom,-object_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `jwt_jwk` JSON Web Key normalization and key material helpers. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` jwt_helpers **Uses:** jwt_der **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `public_key_pem/2` - `symmetric_key_bytes/2` - `compatible_key/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `public_key_pem/2` Converts a supported JWK public key into PEM SubjectPublicKeyInfo text. **Compilation flags:** `static` **Template:** `public_key_pem(Key,PEM)` **Mode and number of proofs:** `public_key_pem(+term,-atom)` - `one_or_error` **Exceptions:** `Key` is not a supported RSA or P-256 EC public JWK: `domain_error(jwt_jwk_public_key,Key)` `Key` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `symmetric_key_bytes/2` Extracts symmetric key bytes from an atom, byte wrapper, or octet JWK. **Compilation flags:** `static` **Template:** `symmetric_key_bytes(Key,Bytes)` **Mode and number of proofs:** `symmetric_key_bytes(+term,-list(byte))` - `one_or_error` **Exceptions:** `Key` is not an atom, byte wrapper, or octet JWK with Base64URL key material: `domain_error(jwt_symmetric_key,Key)` `Key` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `compatible_key/2` Succeeds when a key is compatible with the requested JWT algorithm. **Compilation flags:** `static` **Template:** `compatible_key(Key,Algorithm)` **Mode and number of proofs:** `compatible_key(+term,+atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `jwt_jwks` JSON Web Key Set validation and key selection helpers. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` jwt_helpers **Uses:** jwt_jwa jwt_jwk list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `validate/1` - `select_key/3` - `select_key/4` - `select_keys/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `validate/1` Validates that a term is a JSON Web Key Set. **Compilation flags:** `static` **Template:** `validate(JWKSet)` **Mode and number of proofs:** `validate(+term)` - `one_or_error` **Exceptions:** `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,JWKSet)` ------------------------------------------------------------------------ ###### `select_key/3` Selects a matching verification key from a JWK Set for a JWT header. **Compilation flags:** `static` **Template:** `select_key(JWKSet,Header,Key)` **Mode and number of proofs:** `select_key(+term,+term,-term)` - `one_or_error` **Exceptions:** `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,JWKSet)` `Header` does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` No compatible key exists for `Header`: `existence_error(jwt_jwk,Header)` ------------------------------------------------------------------------ ###### `select_key/4` Selects a matching verification key from a JWK Set for a JWT header and options. **Compilation flags:** `static` **Template:** `select_key(JWKSet,Header,Key,Options)` **Mode and number of proofs:** `select_key(+term,+term,-term,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,JWKSet)` `Header` does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` No compatible key exists for `Header`: `existence_error(jwt_jwk,Header)` ------------------------------------------------------------------------ ###### `select_keys/4` Selects all matching verification keys from a JWK Set for a JWT header and options. **Compilation flags:** `static` **Template:** `select_keys(JWKSet,Header,Keys,Options)` **Mode and number of proofs:** `select_keys(+term,+term,-list(term),+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,JWKSet)` `Header` does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` No compatible key exists for `Header`: `existence_error(jwt_jwk,Header)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `jwt_jws` JWS signing input construction and signature algorithm dispatch. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` jwt_helpers **Uses:** hmac jwt_compact jwt_jwa jwt_jwk jwt_openssl **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `verify/5` - `sign/5` - `sign_payload/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `verify/5` Verifies a JWS signature for a signing input, algorithm, key, and options. **Compilation flags:** `static` **Template:** `verify(Algorithm,SigningInput,Signature,Key,Options)` **Mode and number of proofs:** `verify(+atom,+atom,+list(byte),+term,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `Algorithm` is unsupported: `domain_error(jwt_algorithm,Algorithm)` `Key` is not a valid symmetric key: `domain_error(jwt_symmetric_key,Key)` `Key` is not a supported public JWK: `domain_error(jwt_jwk_public_key,Key)` `Signature` is not a 64-byte raw ES256 signature: `domain_error(jwt_es256_signature,Signature)` The OpenSSL executable does not exist: `existence_error(os_command,Executable)` ------------------------------------------------------------------------ ###### `sign/5` Signs claims as a compact JWT using the given header, key, and options. **Compilation flags:** `static` **Template:** `sign(Header,Claims,Key,Token,Options)` **Mode and number of proofs:** `sign(+term,+term,+term,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Header` does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` `Header` or `Claims` cannot be encoded as JSON: `domain_error(json_sink,HeaderOrClaims)` `Key` is not a valid symmetric key: `domain_error(jwt_symmetric_key,Key)` `Algorithm` is not a supported signing algorithm: `domain_error(jwt_signing_algorithm,Algorithm)` ------------------------------------------------------------------------ ###### `sign_payload/5` Signs a payload JSON term as a compact JWS using the given header, key, and options. **Compilation flags:** `static` **Template:** `sign_payload(Header,Payload,Key,Token,Options)` **Mode and number of proofs:** `sign_payload(+term,+term,+term,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Header` does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(jwt_algorithm,Algorithm)` `Header` or `Payload` cannot be encoded as JSON: `domain_error(json_sink,HeaderOrPayload)` `Key` is not a valid symmetric key: `domain_error(jwt_symmetric_key,Key)` `Algorithm` is not a supported signing algorithm: `domain_error(jwt_signing_algorithm,Algorithm)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `jwt_openssl` OpenSSL-backed JWS signature verification helpers. **Availability:** `logtalk_load(jwt(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** crypto jwt_der list os user **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `verify/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `verify/5` Verifies a JWS signing input and signature using OpenSSL and a PEM public key. **Compilation flags:** `static` **Template:** `verify(Algorithm,PEM,SigningInput,Signature,Options)` **Mode and number of proofs:** `verify(+atom,+atom,+atom,+list(byte),+list(compound))` - `zero_or_one_or_error` **Exceptions:** The OpenSSL executable does not exist: `existence_error(os_command,Executable)` `Signature` is not a 64-byte raw ES256 signature: `domain_error(jwt_es256_signature,Signature)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### kcenters_clusterer") **object** #### `kcenters_clusterer` k-Centers clusterer for continuous datasets. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(kcenters_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, kmeans_clusterer, kmedoids_clusterer, kmedians_clusterer ### kemeny_young_ranker") **object** #### `kemeny_young_ranker` Kemeny-Young pairwise preference ranker. Learns one deterministic consensus order from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by maximizing the total agreeing pairwise preference weight over all linear orders and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(kemeny_young_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common `public` condorcet_victory_common **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - `consensus_ranking/2` - `consensus_score/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `consensus_ranking/2` Returns the learned full-item consensus ranking selected by the Kemeny-Young optimization. **Compilation flags:** `static` **Template:** `consensus_ranking(Ranker,ConsensusRanking)` **Mode and number of proofs:** `consensus_ranking(+compound,-list)` - `one` ------------------------------------------------------------------------ ###### `consensus_score/2` Returns the maximum total pairwise agreement score of the learned consensus ranking. **Compilation flags:** `static` **Template:** `consensus_score(Ranker,ConsensusScore)` **Mode and number of proofs:** `consensus_score(+compound,-number)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, ranked_pairs, schulze_ranker ### kernel_pca_projection") **object** #### `kernel_pca_projection` Kernel Principal Component Analysis reducer for continuous datasets using a portable power-iteration eigensolver over centered kernel Gram matrices. **Availability:** `logtalk_load(kernel_pca_projection(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** format linear_algebra list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pca_projection, random_projection ### kernel_svm_classifier") **object** #### `kernel_svm_classifier` Kernel support vector machine classifier using one-vs-rest dual margin models with linear, polynomial, and radial basis function kernels. **Availability:** `logtalk_load(kernel_svm_classifier(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** format linear_algebra list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, linear_svm_classifier, logistic_regression_classifier, kernel_pca_projection ### kmeans_clusterer") **object** #### `kmeans_clusterer` k-Means clusterer for continuous datasets. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(kmeans_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, nearest_centroid_classifier ### kmedians_clusterer") **object** #### `kmedians_clusterer` k-Medians clusterer for continuous datasets. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(kmedians_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, kmeans_clusterer, kmedoids_clusterer ### kmedoids_clusterer") **object** #### `kmedoids_clusterer` k-Medoids clusterer for continuous datasets. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(kmedoids_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, kmeans_clusterer ### kmodes_clusterer") **object** #### `kmodes_clusterer` k-Modes clusterer for discrete datasets. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(kmodes_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** format list pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, kprototypes_clusterer ### knn_classifier") **object** #### `knn_classifier` k-Nearest Neighbors classifier with multiple distance metrics and weighting options. Learns from a dataset object implementing the `dataset_protocol` protocol and returns a classifier term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(knn_classifier(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** format list pairs type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - `predict/4` - `predict_probabilities/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `predict/4` Predicts the class label for a new instance using the learned classifier and the given options. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict(Classifier,Instance,Class,Options)` **Mode and number of proofs:** `predict(+compound,+list,-atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `predict_probabilities/4` Predicts class probabilities for a new instance using the learned classifier and the given options. Returns a list of `Class-Probability` pairs. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict_probabilities(Classifier,Instance,Probabilities,Options)` **Mode and number of proofs:** `predict_probabilities(+compound,+list,-list,+list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, c45_classifier, isolation_forest_anomaly_detector, naive_bayes_classifier, nearest_centroid_classifier, random_forest_classifier, adaptive_boosting_classifier ### knn_distance_anomaly_detector") **object** #### `knn_distance_anomaly_detector` k-nearest-neighbor distance anomaly detector with multiple distance metrics, mixed-feature support, and missing-value handling. Learns from baseline training examples selected from a dataset object implementing the `anomaly_dataset_protocol` protocol and returns a detector term that can be used for scoring, prediction, and export. **Availability:** `logtalk_load(knn_distance_anomaly_detector(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` anomaly_detector_common **Uses:** format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  score/3  score_all/3  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_protocol, isolation_forest_anomaly_detector, lof_anomaly_detector ### knn_regression") **object** #### `knn_regression` k-Nearest Neighbors regressor with multiple distance metrics, weighting schemes, optional feature scaling, and mixed-feature support. **Availability:** `logtalk_load(knn_regression(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** format list numberlist type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, regression_tree, random_forest_regression, gradient_boosting_regression ### kprototypes_clusterer") **object** #### `kprototypes_clusterer` k-Prototypes clusterer for mixed datasets with continuous and discrete attributes. Learns from a dataset object implementing the `clustering_dataset_protocol` protocol and returns a clusterer term that can be used for assigning new instances to clusters and exported as predicate clauses. **Availability:** `logtalk_load(kprototypes_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common **Uses:** format list pairs population type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, kmeans_clusterer, kmedoids_clusterer ### ksuid") **object** #### `ksuid` KSUID generator using atom representation and the canonical Base62 alphabet. **Availability:** `logtalk_load(ksuid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` ksuid(atom,0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ksuid(Representation,Alphabet), cuid2, nanoid, ids, ulid, snowflakeid, uuid **object** #### `ksuid(Representation,Alphabet)` - `Representation` - Text representation for the KSUID. Possible values are `atom`, `chars`, and `codes`. - `Alphabet` - Base62 alphabet used for encoding KSUIDs represented as an atom, list of characters, or list of character codes. KSUID generator. **Availability:** `logtalk_load(ksuid(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-01 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ksuid_protocol **Uses:** crypto iso8601 list os **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ksuid, cuid2(Representation,Size,Alphabet), nanoid(Representation,Size,Alphabet), ids(Representation,Bytes), ulid(Representation), snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), uuid(Representation) **protocol** #### `ksuid_protocol` KSUID generator protocol. **Availability:** `logtalk_load(ksuid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `generate/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `generate/1` Returns a KSUID. **Compilation flags:** `static` **Template:** `generate(KSUID)` **Mode and number of proofs:** `generate(--ground)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### lasso_regression") **object** #### `lasso_regression` Lasso regression regressor supporting continuous and mixed-feature datasets using coordinate descent with coefficient-wise L1 shrinkage. Learns from a dataset object implementing the `regression_dataset_protocol` protocol and returns a regressor term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(lasso_regression(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-06-16 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** format list numberlist type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, ridge_regression, knn_regression, regression_tree, random_forest_regression, gradient_boosting_regression ### lda_classifier") **object** #### `lda_classifier` Linear Discriminant Analysis classifier for continuous datasets using a pooled regularized covariance model. **Availability:** `logtalk_load(lda_classifier(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` classifier_common **Uses:** format linear_algebra list pairs type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - `predict_scores/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `predict_scores/3` Predicts class discriminant scores for a new instance. **Compilation flags:** `static` **Template:** `predict_scores(Classifier,Instance,Scores)` **Mode and number of proofs:** `predict_scores(+compound,+list,-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, qda_classifier, nearest_centroid_classifier, lda_projection ### lda_projection") **object** #### `lda_projection` Linear Discriminant Analysis projection for labeled continuous datasets using a portable regularized Fisher eigensolver. **Availability:** `logtalk_load(lda_projection(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** format linear_algebra list pairs type **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pca_projection, random_projection ### lgtdoc") **object** #### `lgtdoc` Documenting tool. Generates XML documenting files for loaded entities and for library, directory, entity, and predicate indexes. **Availability:** `logtalk_load(lgtdoc(loader))` **Author:** Paulo Moura **Version:** 11:4:0 **Date:** 2026-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` lgtdocp **Imports:** `public` tool_diagnostics_common `public` options **Uses:** date list logtalk os term_io type user varlist **Remarks:** (none) **Inherited public predicates:**  all/0  all/1  check_option/1  check_options/1  context_summaries/2  default_option/1  default_options/1  diagnostic/2  diagnostic/3  diagnostic_rule/5  diagnostic_rules/1  diagnostic_target/1  diagnostics/2  diagnostics/3  diagnostics_breakdown/2  diagnostics_preflight/2  diagnostics_preflight/3  diagnostics_summary/2  diagnostics_summary/3  diagnostics_tool/5  directories/1  directories/2  directory/1  directory/2  file/1  file/2  files/1  files/2  fix_option/2  fix_options/2  libraries/1  libraries/2  library/1  library/2  merge_options/2  option/2  option/3  rdirectories/1  rdirectories/2  rdirectory/1  rdirectory/2  rlibraries/1  rlibraries/2  rlibrary/1  rlibrary/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - `library_entity_/4` - `directory_entity_/4` - `type_entity_/4` - `predicate_entity_/4` - `cached_run_/5` - `active_diagnostic_/1` - `active_preflight_issue_/1` - `active_collection_mode_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `library_entity_/4` Table of documented entities per library. **Compilation flags:** `dynamic` **Template:** `library_entity_(Library,PrimarySortKey,SecondarySortKey,Entity)` **Mode and number of proofs:** `library_entity_(?atom,?nonvar,?nonvar,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `directory_entity_/4` Table of documented entities per directory. **Compilation flags:** `dynamic` **Template:** `directory_entity_(Directory,PrimarySortKey,SecondarySortKey,Entity)` **Mode and number of proofs:** `directory_entity_(?atom,?nonvar,?nonvar,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `type_entity_/4` Table of documented entities per type. **Compilation flags:** `dynamic` **Template:** `type_entity_(Type,PrimarySortKey,SecondarySortKey,Entity)` **Mode and number of proofs:** `type_entity_(?atom,?nonvar,?nonvar,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `predicate_entity_/4` Table of public predicates for all documented entities. **Compilation flags:** `dynamic` **Template:** `predicate_entity_(Predicate,PrimarySortKey,SecondarySortKey,Entity)` **Mode and number of proofs:** `predicate_entity_(?predicate_indicator,?nonvar,?nonvar,?entity_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `cached_run_/5` Cache of diagnostics collected while generating documentation for a target and merged options. **Compilation flags:** `dynamic` **Template:** `cached_run_(Target,Options,Contexts,Diagnostics,PreflightIssues)` **Mode and number of proofs:** `cached_run_(?nonvar,?list(compound),?list(compound),?list(compound),?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `active_diagnostic_/1` Diagnostics collected during the current documentation run. **Compilation flags:** `dynamic` **Template:** `active_diagnostic_(Diagnostic)` **Mode and number of proofs:** `active_diagnostic_(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `active_preflight_issue_/1` Preflight issues collected during the current documentation run. **Compilation flags:** `dynamic` **Template:** `active_preflight_issue_(Issue)` **Mode and number of proofs:** `active_preflight_issue_(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `active_collection_mode_/1` Current diagnostics collection mode. **Compilation flags:** `dynamic` **Template:** `active_collection_mode_(Mode)` **Mode and number of proofs:** `active_collection_mode_(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **category** #### `lgtdoc_messages` Logtalk documentation tool default message translations. **Availability:** `logtalk_load(lgtdoc(loader))` **Author:** Paulo Moura **Version:** 4:0:1 **Date:** 2024-12-02 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `lgtdocp` Documenting tool protocol. **Availability:** `logtalk_load(lgtdoc(loader))` **Author:** Paulo Moura **Version:** 6:0:0 **Date:** 2024-03-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Compiling files for generating XML documentation: All source files must be compiled with the `source_data` flag turned on. > > - `xml_spec(Specification)` option: XML documenting files specification format. Possible option values are `dtd` (DTD specification; default) and `xsd` (XML Schema specification). > > - `xml_spec_reference(Reference)` option: Reference to the XML specification file in XML documenting files. Possible values are `local` (default; DTD/XSD file in same folder as XML files), `web` (logtalk.org website DTD/XSD file), and `standalone` (no reference to specification files). > > - `entity_xsl_file(File)` option: XSLT file to use with generated XML documenting files. Default is `logtalk_entity_to_xml.xsl`, allowing the XML files to be viewed by opening them with a browser supporting XSLT (after running the `lgt2xml.sh` script on the output directory). > > - `index_xsl_file(File)` option: XSLT file to use with generated XML documenting files. Default is `logtalk_index_to_xml.xsl`, allowing the XML files to be viewed by opening them with a browser supporting XSLT (after running the `lgt2xml.sh` script on the output directory). > > - `xml_docs_directory(Directory)` option: Directory where the XML documenting files will be generated. The default value is `./xml_docs`, a sub-directory of the source files directory. > > - `bom(Boolean)` option: Defines if a BOM should be added to the generated XML documenting files. > > - `encoding(Encoding)` option: Encoding to be used for the generated XML documenting files. > > - `omit_path_prefixes(Prefixes)` option: List of path prefixes (atoms) to omit when writing directory paths. The default value is to omit the home directory. > > - `exclude_files(List)` option: List of files to exclude when generating the XML documenting files. > > - `exclude_paths(List)` option: List of relative library paths to exclude when generating the XML documenting files (default is `[]`). All sub-directories of the excluded directories are also excluded. > > - `exclude_prefixes(List)` option: List of path prefixes to exclude when generating the XML documenting files (default is `[]`). > > - `exclude_entities(List)` option: List of entities to exclude when generating the XML documenting files (default is `[]`). > > - `sort_predicates(Boolean)` option: Sort entity predicates (default is `false`). > > - Known issues: Some options may depend on the used XSL processor. Most XSL processors support DTDs but only some of them support XML Schemas. Some processors (e.g., `fop2`) reject reference to a DTD. **Inherited public predicates:** (none) - Public predicates - `rlibraries/2` - `rlibraries/1` - `rlibrary/2` - `rlibrary/1` - `libraries/2` - `libraries/1` - `library/2` - `library/1` - `rdirectories/2` - `rdirectories/1` - `rdirectory/2` - `rdirectory/1` - `directories/2` - `directories/1` - `directory/2` - `directory/1` - `files/2` - `files/1` - `file/2` - `file/1` - `all/1` - `all/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `rlibraries/2` Creates XML documenting files for all entities in all given libraries and their sub-libraries using the specified options. **Compilation flags:** `static` **Template:** `rlibraries(Libraries,Options)` **Mode and number of proofs:** `rlibraries(+list(atom),+list)` - `one` ------------------------------------------------------------------------ ###### `rlibraries/1` Creates XML documenting files for all entities in all given libraries and their sub-libraries using default options. **Compilation flags:** `static` **Template:** `rlibraries(Libraries)` **Mode and number of proofs:** `rlibraries(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `rlibrary/2` Creates XML documenting files for all entities in a library and its sub-libraries using the specified options. **Compilation flags:** `static` **Template:** `rlibrary(Library,Options)` **Mode and number of proofs:** `rlibrary(+atom,+list)` - `one` **Examples:** Generate XML documenting files for all tool entities for later conversion to Markdown files `rlibrary(tools,[xslfile('lgtmd.xsl')])` `yes` ------------------------------------------------------------------------ ###### `rlibrary/1` Creates XML documenting files for all entities in a library and its sub-libraries using default options. **Compilation flags:** `static` **Template:** `rlibrary(Library)` **Mode and number of proofs:** `rlibrary(+atom)` - `one` **Examples:** Generate XML documenting files for all tool entities for direct viewing in a browser (after indexing using the `lgt2xml` script) `rlibrary(tools)` `yes` ------------------------------------------------------------------------ ###### `libraries/2` Creates XML documenting files for all entities in all given libraries using the specified options. **Compilation flags:** `static` **Template:** `libraries(Libraries,Options)` **Mode and number of proofs:** `libraries(+list(atom),+list)` - `one` ------------------------------------------------------------------------ ###### `libraries/1` Creates XML documenting files for all entities in all given libraries using default options. **Compilation flags:** `static` **Template:** `libraries(Libraries)` **Mode and number of proofs:** `libraries(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `library/2` Creates XML documenting files for all entities in a library using the specified options. **Compilation flags:** `static` **Template:** `library(Library,Options)` **Mode and number of proofs:** `library(+atom,+list)` - `one` **Examples:** Generate XML documenting files for all library entities for later conversion to PDF A4 files `library(library,[xslfile('logtalk_entity_to_pdf_a4.xsl')])` `yes` ------------------------------------------------------------------------ ###### `library/1` Creates XML documenting files for all entities in a library using default options. **Compilation flags:** `static` **Template:** `library(Library)` **Mode and number of proofs:** `library(+atom)` - `one` ------------------------------------------------------------------------ ###### `rdirectories/2` Creates XML documenting files for all entities in all given directories and their sub-directories using the specified options. **Compilation flags:** `static` **Template:** `rdirectories(Directories,Options)` **Mode and number of proofs:** `rdirectories(+list(atom),+list)` - `one` ------------------------------------------------------------------------ ###### `rdirectories/1` Creates XML documenting files for all entities in all given directories and their sub-directories using default options. **Compilation flags:** `static` **Template:** `rdirectories(Directories)` **Mode and number of proofs:** `rdirectories(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `rdirectory/2` Creates XML documenting files for all entities in a directory and its sub-directories using the specified options. **Compilation flags:** `static` **Template:** `rdirectory(Directory,Options)` **Mode and number of proofs:** `rdirectory(+atom,+list)` - `one` **Examples:** Generate XML documenting files for all entities in the tools directory for later conversion to Markdown files `rdirectory('./tools',[xslfile('lgtmd.xsl')])` `yes` ------------------------------------------------------------------------ ###### `rdirectory/1` Creates XML documenting files for all entities in a directory and its sub-directories using default options. **Compilation flags:** `static` **Template:** `rdirectory(Directory)` **Mode and number of proofs:** `rdirectory(+atom)` - `one` **Examples:** Generate XML documenting files for all entities in the tools directory for direct viewing in a browser (after indexing using the `lgt2xml` script) `rdirectory('./tools')` `yes` ------------------------------------------------------------------------ ###### `directories/2` Creates XML documenting files for all entities in all given directories using the specified options. **Compilation flags:** `static` **Template:** `directories(Directories,Options)` **Mode and number of proofs:** `directories(+list(atom),+list)` - `one` ------------------------------------------------------------------------ ###### `directories/1` Creates XML documenting files for all entities in all given directories using default options. **Compilation flags:** `static` **Template:** `directories(Directories)` **Mode and number of proofs:** `directories(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `directory/2` Creates XML documenting files for all entities in a directory using the specified options. **Compilation flags:** `static` **Template:** `directory(Directory,Options)` **Mode and number of proofs:** `directory(+atom,+list)` - `one` **Examples:** Generate XML documenting files for all the entities in the current directory for later conversion to PDF A4 files `directory('.',[xslfile('logtalk_entity_to_pdf_a4.xsl')])` `yes` ------------------------------------------------------------------------ ###### `directory/1` Creates XML documenting files for all entities in a directory using default options. **Compilation flags:** `static` **Template:** `directory(Directory)` **Mode and number of proofs:** `directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `files/2` Creates XML documenting files for all entities in loaded source files using the specified options. The files can be given by name, basename, full path, or using library notation. **Compilation flags:** `static` **Template:** `files(Files,Options)` **Mode and number of proofs:** `files(+list(atom),+list)` - `one` ------------------------------------------------------------------------ ###### `files/1` Creates XML documenting files for all entities in loaded source files using default options. The files can be given by name, basename, full path, or using library notation. **Compilation flags:** `static` **Template:** `files(Files)` **Mode and number of proofs:** `files(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `file/2` Creates XML documenting files for all entities in a loaded source file using the specified options. The file can be given by name, basename, full path, or using library notation. **Compilation flags:** `static` **Template:** `file(File,Options)` **Mode and number of proofs:** `file(+atom,+list)` - `one` ------------------------------------------------------------------------ ###### `file/1` Creates XML documenting files for all entities in a loaded source file using default options. The file can be given by name, basename, full path, or using library notation. **Compilation flags:** `static` **Template:** `file(File)` **Mode and number of proofs:** `file(+atom)` - `one` ------------------------------------------------------------------------ ###### `all/1` Creates XML documenting files for all loaded entities using the specified options. **Compilation flags:** `static` **Template:** `all(Options)` **Mode and number of proofs:** `all(+list)` - `one` ------------------------------------------------------------------------ ###### `all/0` Creates XML documenting files for all loaded entities using default options. **Compilation flags:** `static` **Mode and number of proofs:** `all` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also lgtdoc ### lgtunit") **object** #### `automation_report` Intercepts unit test execution messages and generates a `*.totals` files for parsing by the `logtalk_tester.sh` automation shell script. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 6:0:1 **Date:** 2026-01-25 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** user **Remarks:** > - Usage: Automatically loaded by the `logtalk_tester.sh` shell script. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `cobertura_report` Intercepts unit test execution messages and generates a `cobertura.xml` file with code coverage results. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(cobertura_report))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `timestamp_/6` - `class_/5` - `method_/7` - `lines_covered_/1` - `lines_total_/1` - `summary_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `timestamp_/6` Test start date and time. **Compilation flags:** `dynamic` **Template:** `timestamp_(Year,Month,Day,Hours,Minutes,Seconds)` **Mode and number of proofs:** `timestamp_(?integer,?integer,?integer,?integer,?integer,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `class_/5` Table of entity coverage data. **Compilation flags:** `dynamic` **Template:** `class_(Entity,File,Line,Covered,Total)` **Mode and number of proofs:** `class_(?entity_identifier,?atom,?integer,?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `method_/7` Table of predicate coverage data. **Compilation flags:** `dynamic` **Template:** `method_(Entity,Predicate,Line,Covered,Total,Percentage,Clauses)` **Mode and number of proofs:** `method_(?entity_identifier,?predicate_indicator,?integer,?integer,?integer,?float,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `lines_covered_/1` Counter for total covered lines. **Compilation flags:** `dynamic` **Template:** `lines_covered_(Covered)` **Mode and number of proofs:** `lines_covered_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `lines_total_/1` Counter for total lines. **Compilation flags:** `dynamic` **Template:** `lines_total_(Total)` **Mode and number of proofs:** `lines_total_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `summary_/2` Coverage summary with covered and total entity counts. **Compilation flags:** `dynamic` **Template:** `summary_(Covered,Total)` **Mode and number of proofs:** `summary_(?integer,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `coverage_report` Intercepts unit test execution messages and generates a `coverage_report.xml` file with a test suite code coverage results. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 3:2:1 **Date:** 2026-02-06 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk user **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(coverage_report))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `timestamp_/6` - `object_file_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `timestamp_/6` Cache of the starting tests timestamp. **Compilation flags:** `dynamic` **Template:** `timestamp_(Year,Month,Day,Hours,Minutes,Seconds)` **Mode and number of proofs:** `timestamp_(-integer,-integer,-integer,-integer,-integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `object_file_/2` Cache of test object - file pairs. **Compilation flags:** `dynamic` **Template:** `object_file_(Object,File)` **Mode and number of proofs:** `object_file_(?object_identifier,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `ctrf_output` Intercepts unit test execution messages and outputs a report using the CTRF JSON format to the current output stream. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-27 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(ctrf_output))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `message_cache_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `message_cache_/1` Table of messages emitted by the lgtunit tool when running tests. **Compilation flags:** `dynamic` **Template:** `message_cache_(Message)` **Mode and number of proofs:** `message_cache_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `ctrf_report` Intercepts unit test execution messages and generates a `ctrf_report.json` file using the CTRF JSON format in the same directory as the tests object file. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-27 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(ctrf_report))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `message_cache_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `message_cache_/1` Table of messages emitted by the lgtunit tool when running tests. **Compilation flags:** `dynamic` **Template:** `message_cache_(Message)` **Mode and number of proofs:** `message_cache_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `lcov_report` Intercepts unit test execution messages and generates a `lcov.info` file with code coverage results. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(lcov_report))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `entity_file_/2` - `predicate_coverage_/7` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `entity_file_/2` Table of entity source files. **Compilation flags:** `dynamic` **Template:** `entity_file_(Entity,File)` **Mode and number of proofs:** `entity_file_(?entity_identifier,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `predicate_coverage_/7` Table of predicate coverage data. **Compilation flags:** `dynamic` **Template:** `predicate_coverage_(Entity,Predicate,Line,Covered,Total,Percentage,Clauses)` **Mode and number of proofs:** `predicate_coverage_(?entity_identifier,?predicate_indicator,?integer,?integer,?integer,?float,?list)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `lgtunit` A unit test framework supporting predicate clause coverage, determinism testing, input/output testing, property-based testing, and multiple test dialects. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 22:7:1 **Date:** 2026-06-15 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Imports:** `public` tool_diagnostics_common `public` lgtunit_messages `public` tutor_explanations `public` options **Provides:** logtalk::message_hook/4 logtalk::trace_event/2 **Uses:** fast_random list logtalk os term_io type user **Remarks:** > - Usage: Define test objects as extensions of the `lgtunit` object and compile their source files using the compiler option `hook(lgtunit)`. > > - Portability: Deterministic unit tests are currently not available when using Quintus Prolog as the backend compiler. > > - Known issues: Parameter variables cannot currently be used in the definition of test options. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostic/3  diagnostic_rule/5  diagnostic_rules/1  diagnostic_target/1  diagnostics/2  diagnostics/3  diagnostics_preflight/2  diagnostics_preflight/3  diagnostics_summary/2  diagnostics_summary/3  diagnostics_tool/5  explain//1  failed_test_reason//1  goal_expansion/2  option/2  option/3  term_expansion/2  valid_option/1  valid_options/1 - Public predicates - `cover/1` - `run/0` - `run/1` - `run/2` - `run_test_sets/1` - `test/1` - `number_of_tests/1` - `deterministic/1` - `deterministic/2` - `assertion/1` - `assertion/2` - `quick_check/3` - `quick_check/2` - `quick_check/1` - `benchmark/2` - `benchmark_reified/3` - `benchmark/3` - `benchmark/4` - `variant/2` - `approximately_equal/2` - `approximately_equal/3` - `essentially_equal/3` - `tolerance_equal/4` - `=~=`` ``/`` ``2` - `epsilon/1` - Protected predicates - `run_tests/0` - `run_tests/1` - `run_test_set/0` - `run_quick_check_tests/5` - `condition/0` - `setup/0` - `cleanup/0` - `make/1` - `note/1` - `file_path/2` - `file_url/2` - `suppress_text_output/0` - `suppress_binary_output/0` - `set_text_input/3` - `set_text_input/2` - `set_text_input/1` - `check_text_input/2` - `check_text_input/1` - `text_input_assertion/3` - `text_input_assertion/2` - `clean_text_input/0` - `set_binary_input/3` - `set_binary_input/2` - `set_binary_input/1` - `check_binary_input/2` - `check_binary_input/1` - `binary_input_assertion/3` - `binary_input_assertion/2` - `clean_binary_input/0` - `set_text_output/3` - `set_text_output/2` - `set_text_output/1` - `check_text_output/3` - `check_text_output/2` - `check_text_output/1` - `text_output_assertion/4` - `text_output_assertion/3` - `text_output_assertion/2` - `text_output_contents/3` - `text_output_contents/2` - `text_output_contents/1` - `clean_text_output/0` - `set_binary_output/3` - `set_binary_output/2` - `set_binary_output/1` - `check_binary_output/2` - `check_binary_output/1` - `binary_output_assertion/3` - `binary_output_assertion/2` - `binary_output_contents/2` - `binary_output_contents/1` - `clean_binary_output/0` - `create_text_file/3` - `create_text_file/2` - `create_binary_file/2` - `check_text_file/3` - `check_text_file/2` - `text_file_assertion/4` - `text_file_assertion/3` - `check_binary_file/2` - `binary_file_assertion/3` - `clean_file/1` - `clean_directory/1` - `closed_input_stream/2` - `closed_output_stream/2` - `stream_position/1` - `test/2` - Private predicates - `running_test_sets_/0` - `test/3` - `auxiliary_predicate_counter_/1` - `test_/2` - `selected_test_/1` - `linter_warning_sequence_/1` - `recorded_linter_warning_/7` - `skipped_/1` - `passed_/3` - `failed_/3` - `flaky_/1` - `fired_/3` - `covered_/4` - Operators - `op(700,xfx,=~=)` ##### Public predicates ###### `cover/1` Declares entities being tested for which code coverage information should be collected. **Compilation flags:** `static` **Template:** `cover(Entity)` **Mode and number of proofs:** `cover(?entity_identifier)` - `zero_or_more` ------------------------------------------------------------------------ ###### `run/0` Runs the unit tests, writing the results to the current output stream. **Compilation flags:** `static` **Mode and number of proofs:** `run` - `one` ------------------------------------------------------------------------ ###### `run/1` Runs a unit test or a list of unit tests, writing the results to the current output stream. Runs the global setup and cleanup steps when defined. Fails when given a partial list of tests or when one of the test identifiers is not valid. **Compilation flags:** `static` **Template:** `run(Tests)` **Mode and number of proofs:** `run(++callable)` - `zero_or_one` `run(++list(callable))` - `zero_or_one` ------------------------------------------------------------------------ ###### `run/2` Runs the unit tests, writing the results to the specified file. Mode can be either `write` (to create a new file) or `append` (to add results to an existing file). **Compilation flags:** `static` **Template:** `run(File,Mode)` **Mode and number of proofs:** `run(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `run_test_sets/1` Runs two or more test sets as a unified set generating a single code coverage report if one is requested. When there is a single test set, it is equivalent to sending the message `run/0` to the test set. Trivially succeeds when the argument is an empty list. **Compilation flags:** `static` **Template:** `run_test_sets(TestObjects)` **Mode and number of proofs:** `run_test_sets(+list(object))` - `one` **Exceptions:** `TestObjects` is a partial list or a list with an element which is a variable: `instantiation_error` `TestObjects` is neither a partial list nor a list: `type_error(list(object),TestObjects)` An element `TestObject` of the `TestObjects` list is not an existing object: `existence_error(object,TestObject)` ------------------------------------------------------------------------ ###### `test/1` Enumerates, by backtracking, the identifiers of all defined unit tests. **Compilation flags:** `static` **Template:** `test(Identifier)` **Mode and number of proofs:** `test(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `number_of_tests/1` Number of defined unit tests. **Compilation flags:** `static` **Template:** `number_of_tests(NumerOfTests)` **Mode and number of proofs:** `number_of_tests(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `deterministic/1` True if the goal succeeds once without leaving choice-points. **Compilation flags:** `static` **Template:** `deterministic(Goal)` **Meta-predicate template:** `deterministic(0)` **Mode and number of proofs:** `deterministic(+callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `deterministic/2` Reified version of the `deterministic/1` predicate. True if the goal succeeds. Returns a boolean value (`true` or `false`) indicating if the goal succeeded without leaving choice-points. **Compilation flags:** `static` **Template:** `deterministic(Goal,Deterministic)` **Meta-predicate template:** `deterministic(0,*)` **Mode and number of proofs:** `deterministic(+callable,--atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `assertion/1` True if the assertion goal succeeds. Throws an error using the assertion goal as argument if the assertion goal throws an error or fails. **Compilation flags:** `static` **Template:** `assertion(Assertion)` **Meta-predicate template:** `assertion(::)` **Mode and number of proofs:** `assertion(@callable)` - `one` **Exceptions:** Assertion goal fails: `assertion_failure(Assertion)` Assertion goal throws Error: `assertion_error(Assertion,Error)` ------------------------------------------------------------------------ ###### `assertion/2` True if the assertion goal succeeds. Throws an error using the description as argument if the assertion goal throws an error or fails. The description argument helps to distinguish between different assertions in the same test body. **Compilation flags:** `static` **Template:** `assertion(Description,Assertion)` **Meta-predicate template:** `assertion(*,0)` **Mode and number of proofs:** `assertion(+nonvar,@callable)` - `one` **Exceptions:** Assertion goal fails: `assertion_failure(Description)` Assertion goal throws Error: `assertion_error(Description,Error)` ------------------------------------------------------------------------ ###### `quick_check/3` Reified version of the `quick_check/2` predicate. Reports `passed(SequenceSeed,Discarded,Labels)`, `failed(Goal,SequenceSeed,TestSeed)`, `error(Error,Goal,SequenceSeed,TestSeed)`, or `broken(Why,Culprit)`. `Goal` is the failed test. **Compilation flags:** `static` **Template:** `quick_check(Template,Result,Options)` **Meta-predicate template:** `quick_check(::,*,::)` **Mode and number of proofs:** `quick_check(@callable,-callable,++list(compound))` - `one` **Remarks:** > - `SequenceSeed` argument: Can be used to re-run the same exact sequence of pseudo-random tests by using the `rs/1` option after changes to the code being tested. > > - `TestSeed` argument: Can be used to re-run the test that failed by using the `rs/1` option after changes to the code being tested. > > - `Discarded` argument: Number of generated tests that were discarded for failing to comply a pre-condition specified using the `pc/1` option. > > - `Labels` argument: List of pairs `Label-N` where `N` is the number of generated tests that are classified as `Label` by a closure specified using the `l/1` option. > > - `broken(Why,Culprit)` result: This result signals a broken setup. For example, an invalid template, a broken pre-condition or label goal, or broken test generation. ------------------------------------------------------------------------ ###### `quick_check/2` Generates and runs random tests for a predicate given its mode template and a set of options. Fails when a generated test fails printing the test. Also fails on an invalid option, printing the option. **Compilation flags:** `static` **Template:** `quick_check(Template,Options)` **Meta-predicate template:** `quick_check(::,::)` **Mode and number of proofs:** `quick_check(@callable,++list(compound))` - `zero_or_one` **Remarks:** > - Number of tests: Use the `n(NumberOfTests)` option to specify the number of random tests. Default is 100. > > - Maximum number of shrink operations: Use the `s(MaxShrinks)` option to specify the number of shrink operations when a counter example is found. Default is 64. > > - Type edge cases: Use the `ec(Boolean)` option to specify if type edge cases are tested (before generating random tests). Default is `true`. > > - Starting seed: Use the `rs(Seed)` option to specify the random generator starting seed to be used when generating tests. No default. Seeds should be regarded as opaque terms. > > - Test generation filtering: Use the `pc/1` option to specify a pre-condition closure for filtering generated tests (extended with the test arguments; no default). > > - Generated tests classification: Use the `l/1` option to specify a label closure for classifying the generated tests (extended with the test arguments plus the labels argument; no default). The labelling predicate can return a single test label or a list of test labels. > > - Verbose test generation: Use the `v(Boolean)` option to specify verbose reporting of generated random tests. Default is `false`. > > - Progress bar: Use the `pb(Boolean,Tick)` option to print a progress bar for the executed tests, advancing at every `Tick` tests. Default is `false`. Only applies when the verbose option is false. ------------------------------------------------------------------------ ###### `quick_check/1` Generates and runs random tests using default options for a predicate given its mode template. Fails when a generated test fails printing the test. **Compilation flags:** `static` **Template:** `quick_check(Template)` **Mode and number of proofs:** `quick_check(@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `benchmark/2` Benchmarks a goal and returns the total execution time in seconds. Uses CPU clock. Goals that may throw an exception should be wrapped by the `catch/3` control construct. **Compilation flags:** `static` **Template:** `benchmark(Goal,Time)` **Meta-predicate template:** `benchmark(0,*)` **Mode and number of proofs:** `benchmark(+callable,-float)` - `one` ------------------------------------------------------------------------ ###### `benchmark_reified/3` Benchmarks a goal and returns the total execution time in seconds plus its result (`success`, `failure`, or `error(Error))`. Uses CPU clock. **Compilation flags:** `static` **Template:** `benchmark_reified(Goal,Time,Result)` **Meta-predicate template:** `benchmark_reified(0,*,*)` **Mode and number of proofs:** `benchmark_reified(+callable,-float,-callable)` - `one` ------------------------------------------------------------------------ ###### `benchmark/3` Benchmarks a goal by repeating it the specified number of times and returning the total execution time in seconds. Uses CPU clock. Goals that may throw an exception should be wrapped by the `catch/3` control construct. **Compilation flags:** `static` **Template:** `benchmark(Goal,Repetitions,Time)` **Meta-predicate template:** `benchmark(0,*,*)` **Mode and number of proofs:** `benchmark(@callable,+positive_integer,-float)` - `one` ------------------------------------------------------------------------ ###### `benchmark/4` Benchmarks a goal by repeating it the specified number of times and returning the total execution time in seconds using the given clock (`cpu` or `wall`). Goals that may throw an exception should be wrapped by the `catch/3` control construct. **Compilation flags:** `static` **Template:** `benchmark(Goal,Repetitions,Clock,Time)` **Meta-predicate template:** `benchmark(0,*,*,*)` **Mode and number of proofs:** `benchmark(@callable,+positive_integer,+atom,-float)` - `one` ------------------------------------------------------------------------ ###### `variant/2` True when the two arguments are a variant of each other. I.e. if is possible to rename the term variables to make them identical. Useful for checking expected test results that contain variables. **Compilation flags:** `static` **Template:** `variant(Term1,Term2)` **Mode and number of proofs:** `variant(@term,@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `approximately_equal/2` Compares two numbers for approximate equality given the `epsilon` arithmetic constant value using the de facto standard formula `abs(Number1`` ``-`` ``Number2)`` ``=<`` ``max(abs(Number1),`` ``abs(Number2))`` ``*`` ``epsilon`. Type-checked. **Compilation flags:** `static` **Template:** `approximately_equal(Number1,Number2)` **Mode and number of proofs:** `approximately_equal(+number,+number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `approximately_equal/3` Compares two numbers for approximate equality given a user-defined epsilon value using the de facto standard formula `abs(Number1`` ``-`` ``Number2)`` ``=<`` ``max(abs(Number1),`` ``abs(Number2))`` ``*`` ``Epsilon`. Type-checked. **Compilation flags:** `static` **Template:** `approximately_equal(Number1,Number2,Epsilon)` **Mode and number of proofs:** `approximately_equal(+number,+number,+number)` - `zero_or_one` **Remarks:** > - Epsilon range: Epsilon should be the `epsilon` arithmetic constant value or a small multiple of it. Only use a larger value if a greater error is expected. > > - Comparison with essential equality: For the same epsilon value, approximate equality is weaker requirement than essential equality. ------------------------------------------------------------------------ ###### `essentially_equal/3` Compares two numbers for essential equality given an epsilon value using the de facto standard formula `abs(Number1`` ``-`` ``Number2)`` ``=<`` ``min(abs(Number1),`` ``abs(Number2))`` ``*`` ``Epsilon`. Type-checked. **Compilation flags:** `static` **Template:** `essentially_equal(Number1,Number2,Epsilon)` **Mode and number of proofs:** `essentially_equal(+number,+number,+number)` - `zero_or_one` **Remarks:** > - Comparison with approximate equality: For the same epsilon value, essential equality is a stronger requirement than approximate equality. ------------------------------------------------------------------------ ###### `tolerance_equal/4` Compares two numbers for close equality given relative and absolute tolerances using the de facto standard formula `abs(Number1`` ``-`` ``Number2)`` ``=<`` ``max(RelativeTolerance`` ``*`` ``max(abs(Number1),`` ``abs(Number2)),`` ``AbsoluteTolerance)`. Type-checked. **Compilation flags:** `static` **Template:** `tolerance_equal(Number1,Number2,RelativeTolerance,AbsoluteTolerance)` **Mode and number of proofs:** `tolerance_equal(+number,+number,+number,+number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `=~=`` ``/`` ``2` Compares two numbers (or lists of numbers) for approximate equality using `100*epsilon` for the absolute error and, if that fails, `99.999%` accuracy for the relative error. But these precision values may not be adequate for all cases. Type-checked. **Compilation flags:** `static` **Template:** `=~=(Number1,Number2)` **Mode and number of proofs:** `=~=(+number,+number)` - `zero_or_one` `=~=(+list(number),+list(number))` - `zero_or_one` ------------------------------------------------------------------------ ###### `epsilon/1` Returns the value of epsilon used in the definition of the `(=~=)/2` predicate. **Compilation flags:** `static` **Template:** `epsilon(Epsilon)` **Mode and number of proofs:** `epsilon(-float)` - `one` ------------------------------------------------------------------------ ##### Protected predicates ###### `run_tests/0` Runs all defined unit tests. **Compilation flags:** `static` **Mode and number of proofs:** `run_tests` - `one` ------------------------------------------------------------------------ ###### `run_tests/1` Runs all the tests defined in the given file. **Compilation flags:** `static` **Template:** `run_tests(File)` **Mode and number of proofs:** `run_tests(+atom)` - `one` ------------------------------------------------------------------------ ###### `run_test_set/0` Runs a test set as part of running two or more test sets as a unified set. **Compilation flags:** `static` **Mode and number of proofs:** `run_test_set` - `one` ------------------------------------------------------------------------ ###### `run_quick_check_tests/5` Runs a QuickCheck test using the given options. Returns the starting seed used to generate the random tests, the number of discarded tests, and the test label statistics. **Compilation flags:** `static` **Template:** `run_quick_check_tests(Template,Options,Seed,Discarded,Labels)` **Meta-predicate template:** `run_quick_check_tests(::,::,*,*,*)` **Mode and number of proofs:** `run_quick_check_tests(@callable,+list,--nonvar,--number,--list(pair))` - `one_or_error` **Exceptions:** `Template` is a variable: `quick_check_broken(template_error(Template),instantiation_error)` `Template` is not a callable term: `quick_check_broken(template_error(Template),type_error(callable,Template))` An error is raised while checking a generated test pre-condition: `quick_check_broken(pre_condition_error(Condition),Error)` All generated tests fail the pre-condition: `quick_check_broken(pre_condition_always_fails(Condition))` An error is raised while evaluating a label goal: `quick_check_broken(label_goal_error(Label),Error)` A label goal fails: `quick_check_broken(label_goal_failure(Label))` An error is raised while generating test arguments: `quick_check_broken(generate_test_error(Template),Error)` Test argument generation fails: `quick_check_broken(generate_test_failure(Template),Type)` ------------------------------------------------------------------------ ###### `condition/0` Verifies conditions for running the tests. Defaults to the goal `true`. **Compilation flags:** `static` **Mode and number of proofs:** `condition` - `zero_or_one` ------------------------------------------------------------------------ ###### `setup/0` Setup environment before running the test set. Defaults to the goal `true`. **Compilation flags:** `static` **Mode and number of proofs:** `setup` - `zero_or_one` ------------------------------------------------------------------------ ###### `cleanup/0` Cleanup environment after running the test set. Defaults to the goal `true`. **Compilation flags:** `static` **Mode and number of proofs:** `cleanup` - `zero_or_one` ------------------------------------------------------------------------ ###### `make/1` Make target for automatically running the test set when calling the `logtalk_make/1` built-in predicate. No default. Possible values are `all` and `check`. **Compilation flags:** `static` **Template:** `make(Target)` **Mode and number of proofs:** `make(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `note/1` Note to be printed after the test results. Defaults to the empty atom. **Compilation flags:** `static` **Template:** `note(Note)` **Mode and number of proofs:** `note(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `file_path/2` Returns the absolute path for a file path that is relative to the tests object path. When the file path is already an absolute path, it is expanded to resolve any remaining relative file path parts. **Compilation flags:** `static` **Template:** `file_path(File,Path)` **Mode and number of proofs:** `file_path(+atom,-atom)` - `one` **See also:** clean_file/1 clean_directory/1 ------------------------------------------------------------------------ ###### `file_url/2` Returns the URL for a file path that can be either absolute or relative to the tests object path. When the file path is an absolute path, it is expanded to resolve any remaining relative file path parts. **Compilation flags:** `static` **Template:** `file_url(File,URL)` **Mode and number of proofs:** `file_url(+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `suppress_text_output/0` Suppresses text output. Useful to avoid irrelevant text output from predicates being tested to clutter the test logs. **Compilation flags:** `static` **Mode and number of proofs:** `suppress_text_output` - `one` ------------------------------------------------------------------------ ###### `suppress_binary_output/0` Suppresses binary output. Useful to avoid irrelevant binary output from predicates being tested to clutter the test logs. **Compilation flags:** `static` **Mode and number of proofs:** `suppress_binary_output` - `one` ------------------------------------------------------------------------ ###### `set_text_input/3` Creates a temporary file, in the same directory as the tests object, with the given text contents, and opens it for reading referenced by the given alias and using the additional options. If no `eof_action/1` option is specified, its value will be the default used by the backend compiler. **Compilation flags:** `static` **Template:** `set_text_input(Alias,Contents,Options)` **Mode and number of proofs:** `set_text_input(+atom,+atom,+list(stream_option))` - `one` `set_text_input(+atom,+list(atom),+list(stream_option))` - `one` **See also:** text_input_assertion/3 check_text_input/2 clean_text_input/0 ------------------------------------------------------------------------ ###### `set_text_input/2` Creates a temporary file, in the same directory as the tests object, with the given text contents, and opens it for reading referenced by the given alias and using the default end-of-file action for the used backend compiler. **Compilation flags:** `static` **Template:** `set_text_input(Alias,Contents)` **Mode and number of proofs:** `set_text_input(+atom,+atom)` - `one` `set_text_input(+atom,+list(atom))` - `one` **See also:** text_input_assertion/3 check_text_input/2 clean_text_input/0 ------------------------------------------------------------------------ ###### `set_text_input/1` Creates a temporary file, in the same directory as the tests object, with the given text contents, opens it for reading using the default end-of-file action for the used backend compiler, and sets the current input stream to the file. **Compilation flags:** `static` **Template:** `set_text_input(Contents)` **Mode and number of proofs:** `set_text_input(+atom)` - `one` `set_text_input(+list(atom))` - `one` **See also:** text_input_assertion/2 check_text_input/1 clean_text_input/0 ------------------------------------------------------------------------ ###### `check_text_input/2` Checks that the temporary file (referenced by the given alias) being read have the expected text contents. **Compilation flags:** `static` **Template:** `check_text_input(Alias,Contents)` **Mode and number of proofs:** `check_text_input(+atom,+atom)` - `zero_or_one` **See also:** set_text_input/2 set_text_input/2 text_input_assertion/3 clean_text_input/0 ------------------------------------------------------------------------ ###### `check_text_input/1` Checks that the temporary file being read have the expected text contents. **Compilation flags:** `static` **Template:** `check_text_input(Contents)` **Mode and number of proofs:** `check_text_input(+atom)` - `zero_or_one` **See also:** set_text_input/1 text_input_assertion/2 clean_text_input/0 ------------------------------------------------------------------------ ###### `text_input_assertion/3` Returns an assertion for checking that the temporary file (referenced by the given alias) being read have the expected text contents. **Compilation flags:** `static` **Template:** `text_input_assertion(Alias,Contents,Assertion)` **Mode and number of proofs:** `text_input_assertion(+atom,+atom,--callable)` - `one` **See also:** set_text_input/3 check_text_input/2 clean_text_input/0 ------------------------------------------------------------------------ ###### `text_input_assertion/2` Returns an assertion for checking that the temporary file being read have the expected text contents. **Compilation flags:** `static` **Template:** `text_input_assertion(Contents,Assertion)` **Mode and number of proofs:** `text_input_assertion(+atom,--callable)` - `one` **See also:** set_text_input/1 check_text_input/1 clean_text_input/0 ------------------------------------------------------------------------ ###### `clean_text_input/0` Cleans the temporary file used when testing text input. **Compilation flags:** `static` **Mode and number of proofs:** `clean_text_input` - `one` **See also:** set_text_input/3 set_text_input/2 set_text_input/1 ------------------------------------------------------------------------ ###### `set_binary_input/3` Creates a temporary file, in the same directory as the tests object, with the given binary contents, and opens it for reading referenced by the given alias and using the additional options. If no `eof_action/1` option is specified, its value will be the default used by the backend compiler. **Compilation flags:** `static` **Template:** `set_binary_input(Alias,Bytes,Options)` **Mode and number of proofs:** `set_binary_input(+atom,+list(byte),+list(stream_option))` - `one` **See also:** binary_input_assertion/3 check_binary_input/2 clean_binary_input/0 ------------------------------------------------------------------------ ###### `set_binary_input/2` Creates a temporary file, in the same directory as the tests object, with the given binary contents, and opens it for reading referenced by the given alias and using the default end-of-file action for the used backend compiler. **Compilation flags:** `static` **Template:** `set_binary_input(Alias,Bytes)` **Mode and number of proofs:** `set_binary_input(+atom,+list(byte))` - `one` **See also:** binary_input_assertion/3 check_binary_input/2 clean_binary_input/0 ------------------------------------------------------------------------ ###### `set_binary_input/1` Creates a temporary file, in the same directory as the tests object, with the given binary contents, and opens it for reading using the default end-of-file action for the used backend compiler, and sets the current input stream to the file. **Compilation flags:** `static` **Template:** `set_binary_input(Bytes)` **Mode and number of proofs:** `set_binary_input(+list(byte))` - `one` **See also:** binary_input_assertion/2 check_binary_input/1 clean_binary_input/0 ------------------------------------------------------------------------ ###### `check_binary_input/2` Checks that the temporary file (referenced by the given alias) being read have the expected binary contents. **Compilation flags:** `static` **Template:** `check_binary_input(Alias,Bytes)` **Mode and number of proofs:** `check_binary_input(+atom,+list(byte))` - `zero_or_one` **See also:** set_binary_input/3 set_binary_input/2 binary_input_assertion/3 clean_binary_input/0 ------------------------------------------------------------------------ ###### `check_binary_input/1` Checks that the temporary file being read have the expected binary contents. **Compilation flags:** `static` **Template:** `check_binary_input(Bytes)` **Mode and number of proofs:** `check_binary_input(+list(byte))` - `zero_or_one` **See also:** binary_input_assertion/2 set_binary_input/1 clean_binary_input/0 ------------------------------------------------------------------------ ###### `binary_input_assertion/3` Returns an assertion for checking that the temporary file (referenced by the given alias) being read have the expected binary contents. **Compilation flags:** `static` **Template:** `binary_input_assertion(Alias,Bytes,Assertion)` **Mode and number of proofs:** `binary_input_assertion(+atom,+list(byte),--callable)` - `one` **See also:** check_binary_input/2 set_binary_input/3 set_binary_input/2 clean_binary_input/0 ------------------------------------------------------------------------ ###### `binary_input_assertion/2` Returns an assertion for checking that the temporary file being read have the expected binary contents. **Compilation flags:** `static` **Template:** `binary_input_assertion(Bytes,Assertion)` **Mode and number of proofs:** `binary_input_assertion(+list(byte),--callable)` - `one` **See also:** check_binary_input/1 set_binary_input/1 clean_binary_input/0 ------------------------------------------------------------------------ ###### `clean_binary_input/0` Cleans the temporary file used when testing binary input. **Compilation flags:** `static` **Mode and number of proofs:** `clean_binary_input` - `one` **See also:** set_binary_input/3 set_binary_input/2 set_binary_input/1 ------------------------------------------------------------------------ ###### `set_text_output/3` Creates a temporary file, in the same directory as the tests object, with the given text contents, and opens it for writing referenced by the given alias and using the additional options. **Compilation flags:** `static` **Template:** `set_text_output(Alias,Contents,Options)` **Mode and number of proofs:** `set_text_output(+atom,+atom,+list(stream_option))` - `one` `set_text_output(+atom,+list(atom),+list(stream_option))` - `one` **See also:** text_output_assertion/4 check_text_output/3 clean_text_output/0 ------------------------------------------------------------------------ ###### `set_text_output/2` Creates a temporary file, in the same directory as the tests object, with the given text contents, and referenced by the given alias. **Compilation flags:** `static` **Template:** `set_text_output(Alias,Contents)` **Mode and number of proofs:** `set_text_output(+atom,+atom)` - `one` `set_text_output(+atom,+list(atom))` - `one` **See also:** text_output_assertion/3 check_text_output/2 clean_text_output/0 ------------------------------------------------------------------------ ###### `set_text_output/1` Creates a temporary file, in the same directory as the tests object, with the given text contents, and sets the current output stream to the file. **Compilation flags:** `static` **Template:** `set_text_output(Contents)` **Mode and number of proofs:** `set_text_output(+atom)` - `one` `set_text_output(+list(atom))` - `one` **See also:** text_output_assertion/2 check_text_output/1 clean_text_output/0 ------------------------------------------------------------------------ ###### `check_text_output/3` Checks that the temporary file (open with the given options and alias in the same directory as the tests object) being written have the expected text contents. **Compilation flags:** `static` **Template:** `check_text_output(Alias,Contents,Options)` **Mode and number of proofs:** `check_text_output(+atom,+atom,+list(stream_option))` - `zero_or_one` **See also:** set_text_output/3 text_output_assertion/4 clean_text_output/0 ------------------------------------------------------------------------ ###### `check_text_output/2` Checks that the temporary file (open with default options and alias in the same directory as the tests object) being written have the expected text contents. **Compilation flags:** `static` **Template:** `check_text_output(Alias,Contents)` **Mode and number of proofs:** `check_text_output(+atom,+atom)` - `zero_or_one` **See also:** set_text_output/2 text_output_assertion/3 clean_text_output/0 ------------------------------------------------------------------------ ###### `check_text_output/1` Checks that the temporary file being written have the expected text contents. **Compilation flags:** `static` **Template:** `check_text_output(Contents)` **Mode and number of proofs:** `check_text_output(+atom)` - `zero_or_one` **See also:** set_text_output/1 text_output_assertion/2 clean_text_output/0 ------------------------------------------------------------------------ ###### `text_output_assertion/4` Returns an assertion for checking that the temporary file (open with the given options and alias in the same directory as the tests object) being written have the expected text contents. **Compilation flags:** `static` **Template:** `text_output_assertion(Alias,Contents,Options,Assertion)` **Mode and number of proofs:** `text_output_assertion(+atom,+atom,+list(stream_option),--callable)` - `one` **See also:** set_text_output/3 check_text_output/3 clean_text_output/0 ------------------------------------------------------------------------ ###### `text_output_assertion/3` Returns an assertion for checking that the temporary file (open with default options and alias in the same directory as the tests object) being written have the expected text contents. **Compilation flags:** `static` **Template:** `text_output_assertion(Alias,Contents,Assertion)` **Mode and number of proofs:** `text_output_assertion(+atom,+atom,--callable)` - `one` **See also:** set_text_output/2 check_text_output/2 clean_text_output/0 ------------------------------------------------------------------------ ###### `text_output_assertion/2` Returns an assertion for checking that the temporary file (open with default options in the same directory as the tests object) being written have the expected text contents. **Compilation flags:** `static` **Template:** `text_output_assertion(Contents,Assertion)` **Mode and number of proofs:** `text_output_assertion(+atom,--callable)` - `one` **See also:** set_text_output/1 check_text_output/1 clean_text_output/0 ------------------------------------------------------------------------ ###### `text_output_contents/3` Returns the contents of the temporary file (open with the given options and alias in the same directory as the tests object) being written. **Compilation flags:** `static` **Template:** `text_output_contents(Alias,Contents,Options)` **Mode and number of proofs:** `text_output_contents(+atom,-list(character),+list(stream_option))` - `one` ------------------------------------------------------------------------ ###### `text_output_contents/2` Returns the contents of the temporary file (open with default options and alias in the same directory as the tests object) being written. **Compilation flags:** `static` **Template:** `text_output_contents(Alias,Contents)` **Mode and number of proofs:** `text_output_contents(+atom,-list(character))` - `one` ------------------------------------------------------------------------ ###### `text_output_contents/1` Returns the contents of the temporary file (open with default options in the same directory as the tests object) being written. **Compilation flags:** `static` **Template:** `text_output_contents(Contents)` **Mode and number of proofs:** `text_output_contents(-list(character))` - `one` ------------------------------------------------------------------------ ###### `clean_text_output/0` Cleans the temporary file used when testing text output. **Compilation flags:** `static` **Mode and number of proofs:** `clean_text_output` - `one` **See also:** set_text_output/3 set_text_output/2 set_text_output/1 ------------------------------------------------------------------------ ###### `set_binary_output/3` Creates a temporary file, in the same directory as the tests object, with the given binary contents, and opens it for writing referenced by the given alias and using the additional options. **Compilation flags:** `static` **Template:** `set_binary_output(Alias,Contents,Options)` **Mode and number of proofs:** `set_binary_output(+atom,+list(byte),+list(stream_option))` - `one` **See also:** binary_output_assertion/3 check_binary_output/2 clean_binary_output/0 ------------------------------------------------------------------------ ###### `set_binary_output/2` Creates a temporary file, in the same directory as the tests object, with the given binary contents, and opens it for writing referenced with the given alias. **Compilation flags:** `static` **Template:** `set_binary_output(Alias,Bytes)` **Mode and number of proofs:** `set_binary_output(+atom,+list(byte))` - `one` **See also:** binary_output_assertion/3 check_binary_output/2 clean_binary_output/0 ------------------------------------------------------------------------ ###### `set_binary_output/1` Creates a temporary file, in the same directory as the tests object, with the given binary contents, and sets the current output stream to the file. **Compilation flags:** `static` **Template:** `set_binary_output(Bytes)` **Mode and number of proofs:** `set_binary_output(+list(byte))` - `one` **See also:** binary_output_assertion/2 check_binary_output/1 clean_binary_output/0 ------------------------------------------------------------------------ ###### `check_binary_output/2` Checks that the temporary file (referenced by the given alias) have the expected binary contents. **Compilation flags:** `static` **Template:** `check_binary_output(Alias,Bytes)` **Mode and number of proofs:** `check_binary_output(+atom,+list(byte))` - `zero_or_one` **See also:** set_binary_output/3 set_binary_output/2 binary_output_assertion/3 clean_binary_output/0 ------------------------------------------------------------------------ ###### `check_binary_output/1` Checks that the temporary file (open in the same directory as the tests object) have the expected binary contents. **Compilation flags:** `static` **Template:** `check_binary_output(Bytes)` **Mode and number of proofs:** `check_binary_output(+list(byte))` - `zero_or_one` **See also:** set_binary_output/1 binary_output_assertion/2 clean_binary_output/0 ------------------------------------------------------------------------ ###### `binary_output_assertion/3` Returns an assertion for checking that the temporary file (referenced by the given alias) have the expected binary contents. **Compilation flags:** `static` **Template:** `binary_output_assertion(Alias,Bytes,Assertion)` **Mode and number of proofs:** `binary_output_assertion(+atom,+list(byte),--callable)` - `one` **See also:** set_binary_output/2 check_binary_output/2 clean_binary_output/0 ------------------------------------------------------------------------ ###### `binary_output_assertion/2` Returns an assertion for checking that the temporary file (open in the same directory as the tests object) have the expected binary contents. **Compilation flags:** `static` **Template:** `binary_output_assertion(Bytes,Assertion)` **Mode and number of proofs:** `binary_output_assertion(+list(byte),--callable)` - `one` **See also:** set_binary_output/1 check_binary_output/1 clean_binary_output/0 ------------------------------------------------------------------------ ###### `binary_output_contents/2` Returns the binary contents of the temporary file (referenced by the given alias) being written. **Compilation flags:** `static` **Template:** `binary_output_contents(Alias,Bytes)` **Mode and number of proofs:** `binary_output_contents(+atom,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `binary_output_contents/1` Returns the binary contents of the temporary file being written. **Compilation flags:** `static` **Template:** `binary_output_contents(Bytes)` **Mode and number of proofs:** `binary_output_contents(-list(byte))` - `one` ------------------------------------------------------------------------ ###### `clean_binary_output/0` Cleans the temporary file used when testing binary output. **Compilation flags:** `static` **Mode and number of proofs:** `clean_binary_output` - `one` **See also:** set_binary_output/3 set_binary_output/2 set_binary_output/1 ------------------------------------------------------------------------ ###### `create_text_file/3` Creates a text file with the given contents. The file is open for writing using the given options. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `create_text_file(File,Contents,Options)` **Mode and number of proofs:** `create_text_file(+atom,+atom,+list(stream_option))` - `one` `create_text_file(+atom,+list(atom),+list(stream_option))` - `one` ------------------------------------------------------------------------ ###### `create_text_file/2` Creates a text file with the given contents. The file is open for writing using default options. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `create_text_file(File,Contents)` **Mode and number of proofs:** `create_text_file(+atom,+atom)` - `one` `create_text_file(+atom,+list(atom))` - `one` ------------------------------------------------------------------------ ###### `create_binary_file/2` Creates a binary file with the given contents. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `create_binary_file(File,Bytes)` **Mode and number of proofs:** `create_binary_file(+atom,+list(byte))` - `one` ------------------------------------------------------------------------ ###### `check_text_file/3` Checks that the contents of a text file match the expected contents. The file is open for reading using the given options. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `check_text_file(File,Contents,Options)` **Mode and number of proofs:** `check_text_file(+atom,+atom,+list(stream_option))` - `zero_or_one` **See also:** text_file_assertion/4 ------------------------------------------------------------------------ ###### `check_text_file/2` Checks that the contents of a text file (open for reading using default options) match the expected contents. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `check_text_file(File,Contents)` **Mode and number of proofs:** `check_text_file(+atom,+atom)` - `zero_or_one` **See also:** text_file_assertion/3 ------------------------------------------------------------------------ ###### `text_file_assertion/4` Returns an assertion for checking that the given file have the expected text contents. The file is open for reading using the given options. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `text_file_assertion(File,Contents,Options,Assertion)` **Mode and number of proofs:** `text_file_assertion(+atom,+atom,+list(stream_option),--callable)` - `one` **See also:** check_text_file/3 ------------------------------------------------------------------------ ###### `text_file_assertion/3` Returns an assertion for checking that the given file have the expected text contents. The file is open for reading using default options. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `text_file_assertion(File,Contents,Assertion)` **Mode and number of proofs:** `text_file_assertion(+atom,+atom,--callable)` - `one` **See also:** check_text_file/2 ------------------------------------------------------------------------ ###### `check_binary_file/2` Checks the contents of a binary file match the expected contents. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `check_binary_file(File,Bytes)` **Mode and number of proofs:** `check_binary_file(+atom,+list(byte))` - `zero_or_one` **See also:** binary_file_assertion/3 ------------------------------------------------------------------------ ###### `binary_file_assertion/3` Returns an assertion for checking that the given file have the expected binary contents. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `binary_file_assertion(File,Bytes,Assertion)` **Mode and number of proofs:** `binary_file_assertion(+atom,+list(byte),--callable)` - `one` **See also:** check_binary_file/2 ------------------------------------------------------------------------ ###### `clean_file/1` Closes any existing stream associated with the file and deletes the file if it exists. Relative file paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `clean_file(File)` **Mode and number of proofs:** `clean_file(+atom)` - `one` **See also:** clean_directory/1 file_path/2 ------------------------------------------------------------------------ ###### `clean_directory/1` Deletes a directory if it exists. Relative directory paths are interpreted as relative to the tests object path. **Compilation flags:** `static` **Template:** `clean_directory(Directory)` **Mode and number of proofs:** `clean_directory(+atom)` - `one` **See also:** clean_file/1 file_path/2 ------------------------------------------------------------------------ ###### `closed_input_stream/2` Opens a temporary file in the same directory as the tests object with the given options for reading, closes it, and returns its stream handle. **Compilation flags:** `static` **Template:** `closed_input_stream(Stream,Options)` **Mode and number of proofs:** `closed_input_stream(-stream,+list(stream_option))` - `one` ------------------------------------------------------------------------ ###### `closed_output_stream/2` Opens a temporary file in the same directory as the tests object with the given options for writing, closes it, and returns its stream handle. **Compilation flags:** `static` **Template:** `closed_output_stream(Stream,Options)` **Mode and number of proofs:** `closed_output_stream(-stream,+list(stream_option))` - `zero_or_one` ------------------------------------------------------------------------ ###### `stream_position/1` Returns a syntactically valid stream position by opening a temporary file in the same directory as the tests object. **Compilation flags:** `static` **Template:** `stream_position(Position)` **Mode and number of proofs:** `stream_position(-stream_position)` - `one` ------------------------------------------------------------------------ ###### `test/2` Table of defined tests. **Compilation flags:** `static` **Template:** `test(Identifier,Test)` **Mode and number of proofs:** `test(?callable,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Private predicates ###### `running_test_sets_/0` Internal flag used when running two or more test sets as a unified set. **Compilation flags:** `dynamic` **Mode and number of proofs:** `running_test_sets_` - `zero_or_one` ------------------------------------------------------------------------ ###### `test/3` Compiled unit tests. The list of variables is used to ensure variable sharing between a test with its test options. **Compilation flags:** `static` **Template:** `test(Identifier,Variables,Outcome)` **Mode and number of proofs:** `test(?callable,?list(variable),?nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ###### `auxiliary_predicate_counter_/1` Counter for generating unique auxiliary predicate names. **Compilation flags:** `dynamic` **Template:** `auxiliary_predicate_counter_(Counter)` **Mode and number of proofs:** `auxiliary_predicate_counter_(?integer)` - `one_or_more` ------------------------------------------------------------------------ ###### `test_/2` Table of compiled tests. **Compilation flags:** `dynamic` **Template:** `test_(Identifier,Test)` **Mode and number of proofs:** `test_(?callable,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `selected_test_/1` Table of selected tests for execution. **Compilation flags:** `dynamic` **Template:** `selected_test_(Identifier)` **Mode and number of proofs:** `selected_test_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `linter_warning_sequence_/1` Counter for cached test-compilation linter warnings. **Compilation flags:** `dynamic` **Template:** `linter_warning_sequence_(Sequence)` **Mode and number of proofs:** `linter_warning_sequence_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `recorded_linter_warning_/7` Cache of test-compilation linter warnings. **Compilation flags:** `dynamic` **Template:** `recorded_linter_warning_(Sequence,RuleId,Message,Context,File,Lines,Properties)` **Mode and number of proofs:** `recorded_linter_warning_(?integer,?atom,?atom,?compound,?atom,?compound,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `skipped_/1` Counter for skipped tests. **Compilation flags:** `dynamic` **Template:** `skipped_(Counter)` **Mode and number of proofs:** `skipped_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `passed_/3` Counter and total time for passed tests. **Compilation flags:** `dynamic` **Template:** `passed_(Counter,CPUTime,WallTime)` **Mode and number of proofs:** `passed_(?integer,-float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `failed_/3` Counter and total time for failed tests. **Compilation flags:** `dynamic` **Template:** `failed_(Counter,CPUTime,WallTime)` **Mode and number of proofs:** `failed_(?integer,-float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `flaky_/1` Counter for failed tests that are marked as flaky. **Compilation flags:** `dynamic` **Template:** `flaky_(Counter)` **Mode and number of proofs:** `flaky_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `fired_/3` Fired clauses when running the unit tests. **Compilation flags:** `dynamic` **Template:** `fired_(Entity,Predicate,Clause)` **Mode and number of proofs:** `fired_(?entity_identifier,?predicate_indicator,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `covered_/4` Auxiliary predicate for collecting statistics on clause coverage. **Compilation flags:** `dynamic` **Template:** `covered_(Entity,Predicate,Covered,Total)` **Mode and number of proofs:** `covered_(?entity_identifier,?callable,?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators ###### `op(700,xfx,=~=)` **Scope:** `public` **category** #### `lgtunit_messages` Logtalk unit test framework default message translations. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 12:2:0 **Date:** 2025-10-20 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `failed_test_reason//1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `failed_test_reason//1` Used to rewrite a term representing the reason why a term failed into a list of tokens. **Compilation flags:** `static` **Template:** `failed_test_reason(Reason)` **Mode and number of proofs:** `failed_test_reason(@nonvar)` - `one_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `minimal_output` Intercepts unit test execution messages and outputs a minimal report. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 3:0:0 **Date:** 2021-05-27 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(minimal_output))`. > > - Limitations: Cannot be used when the test objects also intercept `lgtunit` messages. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `subunit_v1_output` Intercepts unit test execution messages and outputs a Subunit v1 text stream to the current output stream. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-02 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** os **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(subunit_v1_output))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `subunit_v1_report` Intercepts unit test execution messages and generates a `subunit_v1_report.txt` file using the Subunit v1 text streaming format in the same directory as the tests object file. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-02 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk os **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(subunit_v1_report))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `subunit_v2_output` Intercepts unit test execution messages and outputs a Subunit v2 binary stream to the current output stream. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-02 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** list os term_io user **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load([basic_types(loader),term_io(loader),lgtunit(subunit_v2_output)])`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `subunit_v2_report` Intercepts unit test execution messages and generates a `subunit_v2_report.bin` file using the Subunit v2 binary streaming format in the same directory as the tests object file. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-02 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** list logtalk os term_io user **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load([basic_types(loader),term_io(loader),lgtunit(subunit_v2_report)])`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `tap_output` Intercepts unit test execution messages and outputs a report using the TAP format to the current output stream. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 5:0:0 **Date:** 2025-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(tap_output))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `generating_/0` - `partial_/1` - `test_count_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `generating_/0` Flag to detect report in progress when processing two or more test sets as a unified set. **Compilation flags:** `dynamic` **Mode and number of proofs:** `generating_` - `zero_or_one` ------------------------------------------------------------------------ ###### `partial_/1` Cache of total of tests per test set. **Compilation flags:** `dynamic` **Template:** `partial_(Count)` **Mode and number of proofs:** `partial_(?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `test_count_/1` Test counter. **Compilation flags:** `dynamic` **Template:** `test_count_(Count)` **Mode and number of proofs:** `test_count_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `tap_report` Intercepts unit test execution messages and generates a `tap_report.txt` file using the TAP output format in the same directory as the tests object file. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 6:0:0 **Date:** 2025-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(tap_report))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `partial_/1` - `test_count_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `partial_/1` Cache of total of tests per test set. **Compilation flags:** `dynamic` **Template:** `partial_(Count)` **Mode and number of proofs:** `partial_(?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `test_count_/1` Test counter. **Compilation flags:** `dynamic` **Template:** `test_count_(Count)` **Mode and number of proofs:** `test_count_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `xunit_net_v2_output` Intercepts unit test execution messages and outputs a report using the xUnit.net v2 XML format to the current output stream. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 5:0:0 **Date:** 2025-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** user **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(xunit_net_v2_output))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `message_cache_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `message_cache_/1` Table of messages emitted by the lgtunit tool when running tests. **Compilation flags:** `dynamic` **Template:** `message_cache_(Message)` **Mode and number of proofs:** `message_cache_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `xunit_net_v2_report` Intercepts unit test execution messages and generates a `xunit_report.xml` file using the xUnit.net v2 XML format in the same directory as the tests object file. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 6:0:0 **Date:** 2025-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk user **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(xunit_net_v2_report))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `message_cache_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `message_cache_/1` Table of messages emitted by the lgtunit tool when running tests. **Compilation flags:** `dynamic` **Template:** `message_cache_(Message)` **Mode and number of proofs:** `message_cache_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `xunit_output` Intercepts unit test execution messages and outputs a report using the xUnit XML format to the current output stream. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 5:0:1 **Date:** 2025-04-11 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk user **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(xunit_output))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `message_cache_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `message_cache_/1` Table of messages emitted by the lgtunit tool when running tests. **Compilation flags:** `dynamic` **Template:** `message_cache_(Message)` **Mode and number of proofs:** `message_cache_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `xunit_report` Intercepts unit test execution messages and generates a `xunit_report.xml` file using the xUnit XML format in the same directory as the tests object file. **Availability:** `logtalk_load(lgtunit(loader))` **Author:** Paulo Moura **Version:** 6:0:0 **Date:** 2025-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** logtalk user **Remarks:** > - Usage: Simply load this object before running your tests using the goal `logtalk_load(lgtunit(xunit_report))`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - `message_cache_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `message_cache_/1` Table of messages emitted by the lgtunit tool when running tests. **Compilation flags:** `dynamic` **Template:** `message_cache_(Message)` **Mode and number of proofs:** `message_cache_(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### library") **protocol** #### `cloning` Object cloning protocol. **Availability:** `logtalk_load(library(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2010-09-14 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `clone/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `clone/1` Clones an object, returning the identifier of the new object if none is given. **Compilation flags:** `static` **Template:** `clone(Clone)` **Mode and number of proofs:** `clone(?object)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `counters` Named integer counters. Counter names can be any nonvar term. **Availability:** `logtalk_load(library(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2022-02-11 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `counter/2` - `increment_counter/1` - `decrement_counter/1` - `reset_counter/1` - `reset_counters/0` - Protected predicates - Private predicates - `counter_/2` - Operators ##### Public predicates ###### `counter/2` True if `Counter` is a counter with value `Value`. **Compilation flags:** `static` **Template:** `counter(Counter,Value)` **Mode and number of proofs:** `counter(?nonvar,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `increment_counter/1` Increments the named counter. **Compilation flags:** `static` **Template:** `increment_counter(Counter)` **Mode and number of proofs:** `increment_counter(+nonvar)` - `one` ------------------------------------------------------------------------ ###### `decrement_counter/1` Decrements the named counter. **Compilation flags:** `static` **Template:** `decrement_counter(Counter)` **Mode and number of proofs:** `decrement_counter(+nonvar)` - `one` ------------------------------------------------------------------------ ###### `reset_counter/1` Resets the named counter to zero. Creates the counter if it does not exist. **Compilation flags:** `static` **Template:** `reset_counter(Counter)` **Mode and number of proofs:** `reset_counter(+nonvar)` - `one` ------------------------------------------------------------------------ ###### `reset_counters/0` Resets all existing named counters to zero. **Compilation flags:** `static` **Mode and number of proofs:** `reset_counters` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates ###### `counter_/2` Table of named counters. **Compilation flags:** `dynamic` **Template:** `counter_(Counter,Value)` **Mode and number of proofs:** `counter_(?nonvar,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `streamvars` Stream variables (supporting logical, backtracable, adding and retrieving of terms). **Availability:** `logtalk_load(library(loader))` **Author:** Nobukuni Kino and Paulo Moura **Version:** 1:3:0 **Date:** 2019-06-15 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `new/1` - `new/2` - `(<=)/2` - `(=>)/2` - Protected predicates - Private predicates - Operators - `op(100,xfx,<=)` - `op(100,xfx,=>)` ##### Public predicates ###### `new/1` Makes `Variable` a stream variable. Initial state will be empty. **Compilation flags:** `static` **Template:** `new(Variable)` **Mode and number of proofs:** `new(--streamvar)` - `one` **Exceptions:** Variable is not a variable: `type_error(variable,Variable)` ------------------------------------------------------------------------ ###### `new/2` Makes `Variable` a stream variable and sets its initial state to `Value`. **Compilation flags:** `static` **Template:** `new(Variable,Value)` **Mode and number of proofs:** `new(--streamvar,@nonvar)` - `one` **Exceptions:** Variable is not a variable: `type_error(variable,Variable)` ------------------------------------------------------------------------ ###### `(<=)/2` Sets the state of the stream variable `Variable` to `Value` (initializing the variable if needed). **Compilation flags:** `static` **Template:** `Variable<=Value` **Mode and number of proofs:** `(?streamvar)<=(@nonvar)` - `one` ------------------------------------------------------------------------ ###### `(=>)/2` Unifies `Value` with the current state of the stream variable `Variable`. **Compilation flags:** `static` **Template:** `Variable=>Value` **Mode and number of proofs:** `+streamvar=>`` ``?nonvar` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators ###### `op(100,xfx,<=)` **Scope:** `public` ###### `op(100,xfx,=>)` **Scope:** `public` ### linda") **object** #### `linda` Linda tuple-space implementation for process communication. Provides a server that acts as a shared blackboard where clients can write (`out/1-2`), read (`rd/1-2`), and remove (`in/1-2`) tuples. Uses threaded engines for the server implementation and the sockets library for network communication. **Availability:** `logtalk_load(linda(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-03-27 **Compilation flags:** `static,`` ``context_switching_calls,`` ``threaded` **Imports:** `public` linda_server `public` linda_client **Remarks:** > - Supported backends: SWI-Prolog, Trealla Prolog, and XVM (requires both multi-threading and sockets support). > > - Linda operations: The basic operations are `out/1-2` (write tuple), `in/1-2` (remove tuple, blocking), `rd/1-2` (read tuple, blocking), `in_noblock/1-2` (remove tuple, non-blocking), and `rd_noblock/1-2` (read tuple, non-blocking). > > - Tuple matching: Tuples are matched using unification. > > - Blocking behavior: The `in/1-2` and `rd/1-2` predicates block until a matching tuple is available. The `in_noblock/1-2` and `rd_noblock/1-2` predicates fail immediately if no matching tuple is found. > > - Multiple clients: Multiple clients can connect to the same server. A tuple removed by the `in/1-2` or `in_noblock/1-2` predicates is only removed for one client. > > - Multiple servers: A client can connect to multiple servers. The first server it connects to, uses by default the `blackboard` alias. > > - API compatibility: The API is inspired by the SICStus Prolog Linda library. > > - Network communication: Uses TCP sockets for client-server communication, allowing processes to run on different machines. **Inherited public predicates:**  check_option/1  check_options/1  close_client/1  default_option/1  default_options/1  findall_in_noblock/3  findall_in_noblock/4  findall_rd_noblock/3  findall_rd_noblock/4  in/1  in/2  in_list/2  in_list/3  in_noblock/1  in_noblock/2  linda/0  linda/1  linda_client/1  linda_client/2  linda_timeout/2  option/2  option/3  out/1  out/2  rd/1  rd/2  rd_list/2  rd_list/3  rd_noblock/1  rd_noblock/2  shutdown_server/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `linda_client` Linda client predicates and client-side connection state. Import into a threaded object together with the linda_server category. **Availability:** `logtalk_load(linda(loader))` **Author:** Paulo Moura **Version:** 2:0:2 **Date:** 2026-06-13 **Compilation flags:** `static` **Extends:** `public` options **Uses:** socket timeout **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `linda_client/2` - `linda_client/1` - `close_client/1` - `shutdown_server/1` - `linda_timeout/2` - `out/2` - `out/1` - `in/2` - `in/1` - `in_noblock/2` - `in_noblock/1` - `in_list/3` - `in_list/2` - `rd/2` - `rd/1` - `rd_noblock/2` - `rd_noblock/1` - `rd_list/3` - `rd_list/2` - `findall_rd_noblock/4` - `findall_rd_noblock/3` - `findall_in_noblock/4` - `findall_in_noblock/3` - Protected predicates - Private predicates - `client_connection_input_/2` - `client_connection_output_/2` - `client_connection_alias_/2` - `client_timeout_/1` - Operators ##### Public predicates ###### `linda_client/2` Connects to a Linda server at the given address (`Host:Port`) using the given options. **Compilation flags:** `static` **Template:** `linda_client(Address,Options)` **Mode and number of proofs:** `linda_client(++address,++list(compound))` - `one_or_error` **Exceptions:** Already connected: `linda_error(already_connected)` Connection failed: `linda_error(connection_failed(Error))` **Remarks:** > - Option `alias(Alias)`: Use `Alias` as an alias to the server address. Default is `blackboard`. ------------------------------------------------------------------------ ###### `linda_client/1` Connects to a Linda server at the given address (`Host:Port`) using default options. **Compilation flags:** `static` **Template:** `linda_client(Address)` **Mode and number of proofs:** `linda_client(++address)` - `one_or_error` **Exceptions:** Already connected: `linda_error(already_connected)` Connection failed: `linda_error(connection_failed(Error))` ------------------------------------------------------------------------ ###### `close_client/1` Closes the connection to the given Linda server. **Compilation flags:** `static` **Template:** `close_client(Address)` **Mode and number of proofs:** `close_client(++address_or_alias)` - `one` ------------------------------------------------------------------------ ###### `shutdown_server/1` Sends a shutdown signal to the given server. The server stops accepting new connections but continues serving existing clients until they all disconnect. The connection used for shutdown is closed after the server acknowledges the request. **Compilation flags:** `static` **Template:** `shutdown_server(Address)` **Mode and number of proofs:** `shutdown_server(++address_or_alias)` - `one_or_error` **Exceptions:** Not connected: `linda_error(not_connected(Address))` ------------------------------------------------------------------------ ###### `linda_timeout/2` Gets or sets the client timeout. `OldTime` is unified with the current timeout and the timeout is set to `NewTime`. The timeout value is either `off` (no timeout, wait forever) or `Seconds:Milliseconds`. **Compilation flags:** `static` **Template:** `linda_timeout(OldTime,NewTime)` **Mode and number of proofs:** `linda_timeout(?compound,+compound)` - `one` ------------------------------------------------------------------------ ###### `out/2` Places the tuple `Tuple` in the tuple-space of the given server. **Compilation flags:** `static` **Template:** `out(AddressOrALias,Tuple)` **Mode and number of proofs:** `out(++address_or_alias,+term)` - `one` ------------------------------------------------------------------------ ###### `out/1` Places the tuple `Tuple` in the tuple-space of the default server. **Compilation flags:** `static` **Template:** `out(Tuple)` **Mode and number of proofs:** `out(+term)` - `one` ------------------------------------------------------------------------ ###### `in/2` Removes a tuple matching `Tuple` from the tuple-space of the given server. Blocks if no matching tuple is available. **Compilation flags:** `static` **Template:** `in(AddressOrALias,Tuple)` **Mode and number of proofs:** `in(++address_or_alias,?term)` - `one` ------------------------------------------------------------------------ ###### `in/1` Removes a tuple matching `Tuple` from the tuple-space of the default server. Blocks if no matching tuple is available. **Compilation flags:** `static` **Template:** `in(Tuple)` **Mode and number of proofs:** `in(?term)` - `one` ------------------------------------------------------------------------ ###### `in_noblock/2` Removes a tuple matching `Tuple` from the tuple-space of the default server. Fails if no matching tuple is available. **Compilation flags:** `static` **Template:** `in_noblock(AddressOrALias,Tuple)` **Mode and number of proofs:** `in_noblock(++address_or_alias,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `in_noblock/1` Removes a tuple matching `Tuple` from the tuple-space of the default server. Fails if no matching tuple is available. **Compilation flags:** `static` **Template:** `in_noblock(Tuple)` **Mode and number of proofs:** `in_noblock(?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `in_list/3` Removes a tuple matching one of the patterns in `TupleList` from the tuple-space of the given server. `Tuple` is unified with the matched tuple. Blocks if no matching tuple is available. **Compilation flags:** `static` **Template:** `in_list(AddressOrALias,TupleList,Tuple)` **Mode and number of proofs:** `in_list(++address_or_alias,+list,?term)` - `one` ------------------------------------------------------------------------ ###### `in_list/2` Removes a tuple matching one of the patterns in `TupleList` from the tuple-space of the default server. `Tuple` is unified with the matched tuple. Blocks if no matching tuple is available. **Compilation flags:** `static` **Template:** `in_list(TupleList,Tuple)` **Mode and number of proofs:** `in_list(+list,?term)` - `one` ------------------------------------------------------------------------ ###### `rd/2` Reads a tuple matching `Tuple` from the tuple-space of the given server without removing it. Blocks if no matching tuple is available. **Compilation flags:** `static` **Template:** `rd(AddressOrALias,Tuple)` **Mode and number of proofs:** `rd(++address_or_alias,?term)` - `one` ------------------------------------------------------------------------ ###### `rd/1` Reads a tuple matching `Tuple` from the tuple-space of the default server without removing it. Blocks if no matching tuple is available. **Compilation flags:** `static` **Template:** `rd(Tuple)` **Mode and number of proofs:** `rd(?term)` - `one` ------------------------------------------------------------------------ ###### `rd_noblock/2` Reads a tuple matching `Tuple` from the tuple-space of the given server without removing it. Fails if no matching tuple is available. **Compilation flags:** `static` **Template:** `rd_noblock(AddressOrALias,Tuple)` **Mode and number of proofs:** `rd_noblock(++address_or_alias,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rd_noblock/1` Reads a tuple matching `Tuple` from the tuple-space of the default server without removing it. Fails if no matching tuple is available. **Compilation flags:** `static` **Template:** `rd_noblock(Tuple)` **Mode and number of proofs:** `rd_noblock(?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rd_list/3` Reads a tuple matching one of the patterns in `TupleList` from the tuple-space of the given server without removing it. `Tuple` is unified with the matched tuple. Blocks if no matching tuple is available. **Compilation flags:** `static` **Template:** `rd_list(AddressOrALias,TupleList,Tuple)` **Mode and number of proofs:** `rd_list(++address_or_alias,+list,?term)` - `one` ------------------------------------------------------------------------ ###### `rd_list/2` Reads a tuple matching one of the patterns in `TupleList` from the tuple-space of the default server without removing it. `Tuple` is unified with the matched tuple. Blocks if no matching tuple is available. **Compilation flags:** `static` **Template:** `rd_list(TupleList,Tuple)` **Mode and number of proofs:** `rd_list(+list,?term)` - `one` ------------------------------------------------------------------------ ###### `findall_rd_noblock/4` Returns a list of all instances of `Template` for tuples matching `Tuple` in the tuple-space. The operation is atomic. **Compilation flags:** `static` **Template:** `findall_rd_noblock(AddressOrALias,Template,Tuple,List)` **Mode and number of proofs:** `findall_rd_noblock(++address_or_alias,?term,+term,?list)` - `one` ------------------------------------------------------------------------ ###### `findall_rd_noblock/3` Returns a list of all instances of `Template` for tuples matching `Tuple` in the tuple-space. The operation is atomic. **Compilation flags:** `static` **Template:** `findall_rd_noblock(Template,Tuple,List)` **Mode and number of proofs:** `findall_rd_noblock(?term,+term,?list)` - `one` ------------------------------------------------------------------------ ###### `findall_in_noblock/4` Removes and returns a list of all instances of `Template` for tuples matching `Tuple` in the tuple-space. The operation is atomic - all matching tuples are removed in one synchronized operation. **Compilation flags:** `static` **Template:** `findall_in_noblock(AddressOrALias,Template,Tuple,List)` **Mode and number of proofs:** `findall_in_noblock(++address_or_alias,?term,+term,?list)` - `one` ------------------------------------------------------------------------ ###### `findall_in_noblock/3` Removes and returns a list of all instances of `Template` for tuples matching `Tuple` in the tuple-space. The operation is atomic - all matching tuples are removed in one synchronized operation. **Compilation flags:** `static` **Template:** `findall_in_noblock(Template,Tuple,List)` **Mode and number of proofs:** `findall_in_noblock(?term,+term,?list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `client_connection_input_/2` Stores the input stream for the client connection to the server. **Compilation flags:** `dynamic` **Template:** `client_connection_input_(Address,InputStream)` **Mode and number of proofs:** `client_connection_input_(?address,?stream)` - `zero_or_more` ------------------------------------------------------------------------ ###### `client_connection_output_/2` Stores the output stream for the client connection to the server. **Compilation flags:** `dynamic` **Template:** `client_connection_output_(Address,OutputStream)` **Mode and number of proofs:** `client_connection_output_(?address,?stream)` - `zero_or_more` ------------------------------------------------------------------------ ###### `client_connection_alias_/2` Stores the client connection server aliases. **Compilation flags:** `dynamic` **Template:** `client_connection_alias_(Address,Alias)` **Mode and number of proofs:** `client_connection_alias_(?address,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `client_timeout_/1` Stores the timeout value for blocking client operations. Value is either `off` or `Seconds:Milliseconds`. **Compilation flags:** `dynamic` **Template:** `client_timeout_(Timeout)` **Mode and number of proofs:** `client_timeout_(?compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **category** #### `linda_server` Linda server predicates and tuple-space state. Import into a threaded object together with the linda_client category. **Availability:** `logtalk_load(linda(loader))` **Author:** Paulo Moura **Version:** 2:0:4 **Date:** 2026-07-14 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 **Uses:** list logtalk os socket **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `linda/1` - `linda/0` - Protected predicates - Private predicates - `server_socket_/1` - `client_connection_/3` - `accept_hook_/1` - `server_running_/1` - `server_shutdown_/0` - `accept_loop_stopped_/0` - `tuple_/1` - `waiting_/3` - `client_engine_/2` - `ts_out/1` - `ts_in/4` - `ts_in_noblock/2` - `ts_in_list/4` - `ts_rd/4` - `ts_rd_noblock/2` - `ts_rd_list/4` - `ts_findall_rd_noblock/3` - `ts_findall_in_noblock/3` - Operators ##### Public predicates ###### `linda/1` Starts a Linda server with the given options. The predicate succeeds when all clients have disconnected after a shutdown request. **Compilation flags:** `static` **Template:** `linda(Options)` **Meta-predicate template:** `linda(::)` **Mode and number of proofs:** `linda(+list)` - `one` **Remarks:** > - Option `port(Port)`: Use `Port` as the server port. Must be an integer and an available port. > > - Option `Address-Goal`: `Address` is unified with `Host:Port` and `Goal` is called when the server starts. Useful for saving the address or starting clients. > > - Option `accept_hook(Client,Input,Output,Goal)`: When a client connects, `Client` is unified with the client address, `Input` and `Output` with the connection streams, and `Goal` is called. If `Goal` fails, the connection is rejected. ------------------------------------------------------------------------ ###### `linda/0` Starts a Linda server on an automatically assigned port using default options. The server address (`Host:Port`) is written to the current output stream. The predicate succeeds when all clients have disconnected after a shutdown request. **Compilation flags:** `static` **Mode and number of proofs:** `linda` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `server_socket_/1` Stores the server socket descriptor. **Compilation flags:** `dynamic` **Template:** `server_socket_(ServerSocket)` **Mode and number of proofs:** `server_socket_(?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `client_connection_/3` Stores active client connections. Each client has an ID, input stream, and output stream. **Compilation flags:** `dynamic` **Template:** `client_connection_(ClientId,InputStream,OutputStream)` **Mode and number of proofs:** `client_connection_(?term,?term,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `accept_hook_/1` Stores the optional accept hook goal to call when a client connects. **Compilation flags:** `dynamic` **Template:** `accept_hook_(Hook)` **Mode and number of proofs:** `accept_hook_(?callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `server_running_/1` Flag indicating the server is running. **Compilation flags:** `dynamic` **Template:** `server_running_(Address)` **Mode and number of proofs:** `server_running_(?address)` - `zero_or_one` ------------------------------------------------------------------------ ###### `server_shutdown_/0` Flag indicating the server has received a shutdown request. **Compilation flags:** `dynamic` **Mode and number of proofs:** `server_shutdown_` - `zero_or_one` ------------------------------------------------------------------------ ###### `accept_loop_stopped_/0` Flag indicating the server accept loop has stopped. **Compilation flags:** `dynamic` **Mode and number of proofs:** `accept_loop_stopped_` - `zero_or_one` ------------------------------------------------------------------------ ###### `tuple_/1` Stores tuples in the Linda tuple space. **Compilation flags:** `dynamic` **Template:** `tuple_(Tuple)` **Mode and number of proofs:** `tuple_(?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `waiting_/3` Stores blocked clients waiting for tuples. Records the client ID, request pattern, and output stream. **Compilation flags:** `dynamic` **Template:** `waiting_(ClientId,Request,OutputStream)` **Mode and number of proofs:** `waiting_(?term,?term,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `client_engine_/2` Maps client IDs to their corresponding threaded engine names. **Compilation flags:** `dynamic` **Template:** `client_engine_(ClientId,EngineName)` **Mode and number of proofs:** `client_engine_(?term,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `ts_out/1` Synchronized predicate to add a tuple to the tuple space and wake waiting clients. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_out(Tuple)` **Mode and number of proofs:** `ts_out(+term)` - `one` ------------------------------------------------------------------------ ###### `ts_in/4` Synchronized predicate to remove a matching tuple or register a waiting client. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_in(Tuple,ClientId,OutputStream,Found)` **Mode and number of proofs:** `ts_in(+term,+term,+term,-compound)` - `one` ------------------------------------------------------------------------ ###### `ts_in_noblock/2` Synchronized predicate to try removing a matching tuple without blocking. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_in_noblock(Tuple,Found)` **Mode and number of proofs:** `ts_in_noblock(+term,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `ts_in_list/4` Synchronized predicate to remove a tuple matching one of multiple patterns or register a waiting client. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_in_list(TupleList,ClientId,OutputStream,Found)` **Mode and number of proofs:** `ts_in_list(+list,+term,+term,-compound)` - `one` ------------------------------------------------------------------------ ###### `ts_rd/4` Synchronized predicate to read a matching tuple or register a waiting client. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_rd(Tuple,ClientId,OutputStream,Found)` **Mode and number of proofs:** `ts_rd(+term,+term,+term,-compound)` - `one` ------------------------------------------------------------------------ ###### `ts_rd_noblock/2` Synchronized predicate to try reading a matching tuple without blocking. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_rd_noblock(Tuple,Found)` **Mode and number of proofs:** `ts_rd_noblock(+term,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `ts_rd_list/4` Synchronized predicate to read a tuple matching one of multiple patterns or register a waiting client. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_rd_list(TupleList,ClientId,OutputStream,Found)` **Mode and number of proofs:** `ts_rd_list(+list,+term,+term,-compound)` - `one` ------------------------------------------------------------------------ ###### `ts_findall_rd_noblock/3` Synchronized predicate to collect all tuples matching a pattern. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_findall_rd_noblock(Template,Tuple,List)` **Mode and number of proofs:** `ts_findall_rd_noblock(+term,+term,-list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `ts_findall_in_noblock/3` Synchronized predicate to collect and remove all tuples matching a pattern. **Compilation flags:** `static,`` ``synchronized` **Template:** `ts_findall_in_noblock(Template,Tuple,List)` **Mode and number of proofs:** `ts_findall_in_noblock(+term,+term,-list)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### linear_algebra") **object** #### `linear_algebra` Linear algebra predicates for numeric vectors and matrices implemented without dependencies on machine learning libraries. **Availability:** `logtalk_load(linear_algebra(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` linear_algebra_protocol **Uses:** list numberlist type **Remarks:** (none) **Inherited public predicates:**  add_matrices/3  add_scaled_outer_product/4  add_scaled_vector/4  add_vectors/3  backward_substitution/3  basis_vector/3  center_gram_matrix/4  center_gram_vector/4  cholesky_decomposition/2  covariance_matrix/2  determinant/2  diagonal_matrix/2  diagonal_matrix/3  diagonal_matrix/4  difference_norm/3  dot_product/3  euclidean_norm/2  first_significant_component/2  first_significant_component/3  forward_substitution/3  frobenius_norm/2  gram_matrix/2  identity_matrix/2  inverse_matrix/2  invert_from_cholesky/2  least_squares/3  lower_triangular_part/2  lower_triangular_part/3  matrix_column/3  matrix_column_means/2  matrix_diagonal/2  matrix_diagonal/3  matrix_matrix_product/3  matrix_rank/2  matrix_rank/3  matrix_row/3  matrix_row_means/2  matrix_trace/2  matrix_value/4  matrix_vector_product/3  new_matrix/4  new_vector/3  new_vector_like/2  normalize_vector/2  normalize_vector/3  null_space/2  null_space/3  outer_product/3  pseudo_inverse/2  pseudo_inverse/3  qr_decomposition/3  scale_matrix/3  scale_vector/3  shift_matrix_diagonal/3  solve_cholesky/3  solve_linear_system/3  solve_linear_systems/3  solve_lower_triangular_matrix/3  solve_upper_triangular/3  solve_upper_triangular_matrix/3  stabilize_vector_sign/2  stabilize_vector_sign/3  subtract_matrices/3  subtract_vectors/3  symmetric_eigen/3  symmetric_eigen/4  symmetric_eigen/5  transpose_matrix/2  upper_triangular_part/2  upper_triangular_part/3  vector_norm/3  vector_value/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `linear_algebra_protocol` Linear algebra protocol. **Availability:** `logtalk_load(linear_algebra(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `new_vector/3` - `new_vector_like/2` - `add_vectors/3` - `subtract_vectors/3` - `add_scaled_vector/4` - `scale_vector/3` - `dot_product/3` - `euclidean_norm/2` - `vector_norm/3` - `basis_vector/3` - `new_matrix/4` - `identity_matrix/2` - `matrix_vector_product/3` - `matrix_matrix_product/3` - `gram_matrix/2` - `matrix_row_means/2` - `matrix_column_means/2` - `center_gram_matrix/4` - `center_gram_vector/4` - `outer_product/3` - `add_matrices/3` - `subtract_matrices/3` - `scale_matrix/3` - `frobenius_norm/2` - `transpose_matrix/2` - `vector_value/3` - `matrix_row/3` - `matrix_column/3` - `matrix_value/4` - `matrix_diagonal/2` - `matrix_diagonal/3` - `diagonal_matrix/2` - `diagonal_matrix/3` - `diagonal_matrix/4` - `matrix_trace/2` - `shift_matrix_diagonal/3` - `upper_triangular_part/2` - `upper_triangular_part/3` - `lower_triangular_part/2` - `lower_triangular_part/3` - `solve_linear_system/3` - `solve_linear_systems/3` - `determinant/2` - `inverse_matrix/2` - `qr_decomposition/3` - `least_squares/3` - `matrix_rank/2` - `matrix_rank/3` - `symmetric_eigen/3` - `symmetric_eigen/4` - `symmetric_eigen/5` - `pseudo_inverse/2` - `pseudo_inverse/3` - `null_space/2` - `null_space/3` - `normalize_vector/2` - `normalize_vector/3` - `difference_norm/3` - `stabilize_vector_sign/2` - `stabilize_vector_sign/3` - `first_significant_component/2` - `first_significant_component/3` - `add_scaled_outer_product/4` - `covariance_matrix/2` - `cholesky_decomposition/2` - `solve_cholesky/3` - `forward_substitution/3` - `solve_lower_triangular_matrix/3` - `solve_upper_triangular/3` - `solve_upper_triangular_matrix/3` - `backward_substitution/3` - `invert_from_cholesky/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `new_vector/3` Constructs a numeric vector with the requested length, filled with the given value. **Compilation flags:** `static` **Template:** `new_vector(Count,Value,Vector)` **Mode and number of proofs:** `new_vector(+integer,+number,-list(number))` - `one` **Exceptions:** `Count` is a variable: `instantiation_error` `Value` is a variable: `instantiation_error` `Count` is neither a variable nor an integer: `type_error(integer,Count)` `Value` is neither a variable nor a number: `type_error(number,Value)` `Count` is an integer that is less than zero: `domain_error(non_negative_integer,Count)` ------------------------------------------------------------------------ ###### `new_vector_like/2` Constructs a numeric zero vector matching the length of the reference list. **Compilation flags:** `static` **Template:** `new_vector_like(Reference,Zeroes)` **Mode and number of proofs:** `new_vector_like(+list,-list(number))` - `one` ------------------------------------------------------------------------ ###### `add_vectors/3` Adds two numeric vectors element-wise. **Compilation flags:** `static` **Template:** `add_vectors(Vector1,Vector2,Vector)` **Mode and number of proofs:** `add_vectors(+list(number),+list(number),-list(number))` - `one` ------------------------------------------------------------------------ ###### `subtract_vectors/3` Subtracts the second numeric vector from the first element-wise. **Compilation flags:** `static` **Template:** `subtract_vectors(Vector1,Vector2,Vector)` **Mode and number of proofs:** `subtract_vectors(+list(number),+list(number),-list(number))` - `one` ------------------------------------------------------------------------ ###### `add_scaled_vector/4` Adds a scaled numeric vector to another numeric vector. **Compilation flags:** `static` **Template:** `add_scaled_vector(Vector,Scale,Vector0,UpdatedVector)` **Mode and number of proofs:** `add_scaled_vector(+list(number),+number,+list(number),-list(number))` - `one` **Exceptions:** `Scale` is a variable: `instantiation_error` `Scale` is neither a variable nor a number: `type_error(number,Scale)` ------------------------------------------------------------------------ ###### `scale_vector/3` Scales a numeric vector by the given factor. **Compilation flags:** `static` **Template:** `scale_vector(Vector,Scale,ScaledVector)` **Mode and number of proofs:** `scale_vector(+list(number),+number,-list(number))` - `one` **Exceptions:** `Scale` is a variable: `instantiation_error` `Scale` is neither a variable nor a number: `type_error(number,Scale)` ------------------------------------------------------------------------ ###### `dot_product/3` Computes the dot product of two numeric vectors. **Compilation flags:** `static` **Template:** `dot_product(Vector1,Vector2,Product)` **Mode and number of proofs:** `dot_product(+list(number),+list(number),-number)` - `one` ------------------------------------------------------------------------ ###### `euclidean_norm/2` Computes the Euclidean norm of a numeric vector. **Compilation flags:** `static` **Template:** `euclidean_norm(Vector,Norm)` **Mode and number of proofs:** `euclidean_norm(+list(number),-float)` - `one` ------------------------------------------------------------------------ ###### `vector_norm/3` Computes the norm of a numeric vector for a positive numeric order or the atoms inf and infinity. **Compilation flags:** `static` **Template:** `vector_norm(Vector,Order,Norm)` **Mode and number of proofs:** `vector_norm(+list(number),@term,-number)` - `one_or_error` **Exceptions:** `Order` is a variable: `instantiation_error` `Order` is neither a variable, a number, nor one of the atoms `inf` and `infinity`: `type_error(number,Order)` `Order` is a number but not a valid positive_number_or_infinity: `domain_error(positive_number_or_infinity,Order)` ------------------------------------------------------------------------ ###### `basis_vector/3` Constructs a numeric basis vector with value 1.0 at the given one-based index and 0.0 elsewhere. **Compilation flags:** `static` **Template:** `basis_vector(Size,Index,Vector)` **Mode and number of proofs:** `basis_vector(+integer,+integer,-list(number))` - `one` **Exceptions:** `Size` is a variable: `instantiation_error` `Index` is a variable: `instantiation_error` `Size` is neither a variable nor an integer: `type_error(integer,Size)` `Index` is neither a variable nor an integer: `type_error(integer,Index)` `Size` is an integer that is less than one: `domain_error(positive_integer,Size)` `Index` is an integer that is less than one: `domain_error(positive_integer,Index)` ------------------------------------------------------------------------ ###### `new_matrix/4` Constructs a numeric matrix with the requested row and column counts, filled with the given value. **Compilation flags:** `static` **Template:** `new_matrix(Rows,Columns,Value,Matrix)` **Mode and number of proofs:** `new_matrix(+integer,+integer,+number,-list(list(number)))` - `one` **Exceptions:** `Rows` is a variable: `instantiation_error` `Columns` is a variable: `instantiation_error` `Value` is a variable: `instantiation_error` `Rows` is neither a variable nor an integer: `type_error(integer,Rows)` `Columns` is neither a variable nor an integer: `type_error(integer,Columns)` `Value` is neither a variable nor a number: `type_error(number,Value)` `Rows` is an integer that is less than zero: `domain_error(non_negative_integer,Rows)` `Columns` is an integer that is less than zero: `domain_error(non_negative_integer,Columns)` ------------------------------------------------------------------------ ###### `identity_matrix/2` Constructs a square identity matrix with the requested size. **Compilation flags:** `static` **Template:** `identity_matrix(Size,Matrix)` **Mode and number of proofs:** `identity_matrix(+integer,-list(list(number)))` - `one` **Exceptions:** `Size` is a variable: `instantiation_error` `Size` is neither a variable nor an integer: `type_error(integer,Size)` `Size` is an integer that is less than zero: `domain_error(non_negative_integer,Size)` ------------------------------------------------------------------------ ###### `matrix_vector_product/3` Computes the matrix-vector product for a numeric matrix and vector, returning the list of row-wise dot products between each matrix row and the vector. **Compilation flags:** `static` **Template:** `matrix_vector_product(Matrix,Vector,Product)` **Mode and number of proofs:** `matrix_vector_product(+list(list(number)),+list(number),-list(number))` - `one` ------------------------------------------------------------------------ ###### `matrix_matrix_product/3` Computes the matrix-matrix product for two numeric matrices. **Compilation flags:** `static` **Template:** `matrix_matrix_product(Matrix1,Matrix2,Product)` **Mode and number of proofs:** `matrix_matrix_product(+list(list(number)),+list(list(number)),-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `gram_matrix/2` Computes the row Gram matrix of a numeric row matrix by taking all row-wise dot products. **Compilation flags:** `static` **Template:** `gram_matrix(Rows,GramMatrix)` **Mode and number of proofs:** `gram_matrix(+list(list(number)),-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `matrix_row_means/2` Computes the arithmetic mean of each row in a numeric matrix. **Compilation flags:** `static` **Template:** `matrix_row_means(Matrix,Means)` **Mode and number of proofs:** `matrix_row_means(+list(list(number)),-list(number))` - `one` **Exceptions:** `Matrix` contains an empty row `Row`: `domain_error(minimum_number_of_values(1),Row)` ------------------------------------------------------------------------ ###### `matrix_column_means/2` Computes the arithmetic mean of each column in a numeric matrix. **Compilation flags:** `static` **Template:** `matrix_column_means(Matrix,Means)` **Mode and number of proofs:** `matrix_column_means(+list(list(number)),-list(number))` - `one` ------------------------------------------------------------------------ ###### `center_gram_matrix/4` Double-centers a numeric Gram matrix and also returns its row means and total mean. **Compilation flags:** `static` **Template:** `center_gram_matrix(GramMatrix,CenteredGramMatrix,RowMeans,TotalMean)` **Mode and number of proofs:** `center_gram_matrix(+list(list(number)),-list(list(number)),-list(number),-number)` - `one` **Exceptions:** `GramMatrix` is empty: `domain_error(minimum_number_of_values(1),GramMatrix)` `GramMatrix` contains an empty row `Row`: `domain_error(minimum_number_of_values(1),Row)` ------------------------------------------------------------------------ ###### `center_gram_vector/4` Centers a numeric Gram vector using training row means and total mean. **Compilation flags:** `static` **Template:** `center_gram_vector(GramVector,RowMeans,TotalMean,CenteredGramVector)` **Mode and number of proofs:** `center_gram_vector(+list(number),+list(number),+number,-list(number))` - `one` **Exceptions:** `GramVector` is empty: `domain_error(minimum_number_of_values(1),GramVector)` ------------------------------------------------------------------------ ###### `outer_product/3` Computes the outer product of two numeric vectors. **Compilation flags:** `static` **Template:** `outer_product(Vector1,Vector2,Matrix)` **Mode and number of proofs:** `outer_product(+list(number),+list(number),-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `add_matrices/3` Adds two numeric matrices element-wise. **Compilation flags:** `static` **Template:** `add_matrices(Matrix1,Matrix2,Matrix)` **Mode and number of proofs:** `add_matrices(+list(list(number)),+list(list(number)),-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `subtract_matrices/3` Subtracts the second numeric matrix from the first element-wise. **Compilation flags:** `static` **Template:** `subtract_matrices(Matrix1,Matrix2,Matrix)` **Mode and number of proofs:** `subtract_matrices(+list(list(number)),+list(list(number)),-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `scale_matrix/3` Scales each element of a numeric matrix by the given factor. **Compilation flags:** `static` **Template:** `scale_matrix(Matrix,Scale,ScaledMatrix)` **Mode and number of proofs:** `scale_matrix(+list(list(number)),+number,-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `frobenius_norm/2` Computes the Frobenius norm of a numeric matrix. **Compilation flags:** `static` **Template:** `frobenius_norm(Matrix,Norm)` **Mode and number of proofs:** `frobenius_norm(+list(list(number)),-float)` - `one_or_error` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `transpose_matrix/2` Transposes a numeric matrix represented as a list of row lists. **Compilation flags:** `static` **Template:** `transpose_matrix(Matrix,Transpose)` **Mode and number of proofs:** `transpose_matrix(+list(list(number)),-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `vector_value/3` Looks up a numeric vector element using a one-based index. **Compilation flags:** `static` **Template:** `vector_value(Vector,Index,Value)` **Mode and number of proofs:** `vector_value(+list(number),+integer,-number)` - `one` **Exceptions:** `Index` is a variable: `instantiation_error` `Index` is neither a variable nor an integer: `type_error(integer,Index)` `Index` is an integer that is less than one: `domain_error(positive_integer,Index)` ------------------------------------------------------------------------ ###### `matrix_row/3` Looks up a numeric matrix row using a one-based row index. **Compilation flags:** `static` **Template:** `matrix_row(Matrix,RowIndex,Row)` **Mode and number of proofs:** `matrix_row(+list(list(number)),+integer,-list(number))` - `one` **Exceptions:** `RowIndex` is a variable: `instantiation_error` `RowIndex` is neither a variable nor an integer: `type_error(integer,RowIndex)` `RowIndex` is an integer that is less than one: `domain_error(positive_integer,RowIndex)` ------------------------------------------------------------------------ ###### `matrix_column/3` Looks up a numeric matrix column using a one-based column index. **Compilation flags:** `static` **Template:** `matrix_column(Matrix,ColumnIndex,Column)` **Mode and number of proofs:** `matrix_column(+list(list(number)),+integer,-list(number))` - `one` **Exceptions:** `ColumnIndex` is a variable: `instantiation_error` `ColumnIndex` is neither a variable nor an integer: `type_error(integer,ColumnIndex)` `ColumnIndex` is an integer that is less than one: `domain_error(positive_integer,ColumnIndex)` ------------------------------------------------------------------------ ###### `matrix_value/4` Looks up a numeric matrix element using one-based row and column indices. **Compilation flags:** `static` **Template:** `matrix_value(Matrix,RowIndex,ColumnIndex,Value)` **Mode and number of proofs:** `matrix_value(+list(list(number)),+integer,+integer,-number)` - `one` **Exceptions:** `RowIndex` is a variable: `instantiation_error` `ColumnIndex` is a variable: `instantiation_error` `RowIndex` is neither a variable nor an integer: `type_error(integer,RowIndex)` `ColumnIndex` is neither a variable nor an integer: `type_error(integer,ColumnIndex)` `RowIndex` is an integer that is less than one: `domain_error(positive_integer,RowIndex)` `ColumnIndex` is an integer that is less than one: `domain_error(positive_integer,ColumnIndex)` ------------------------------------------------------------------------ ###### `matrix_diagonal/2` Extracts the main diagonal of a numeric matrix as a vector. **Compilation flags:** `static` **Template:** `matrix_diagonal(Matrix,Diagonal)` **Mode and number of proofs:** `matrix_diagonal(+list(list(number)),-list(number))` - `one` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `matrix_diagonal/3` Extracts the diagonal of a numeric matrix at the given offset, where positive offsets select superdiagonals and negative offsets select subdiagonals. **Compilation flags:** `static` **Template:** `matrix_diagonal(Matrix,Offset,Diagonal)` **Mode and number of proofs:** `matrix_diagonal(+list(list(number)),+integer,-list(number))` - `one_or_error` **Exceptions:** `Offset` is a variable: `instantiation_error` `Offset` is neither a variable nor an integer: `type_error(integer,Offset)` `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `diagonal_matrix/2` Constructs a square diagonal matrix from a numeric vector of diagonal entries. **Compilation flags:** `static` **Template:** `diagonal_matrix(Diagonal,Matrix)` **Mode and number of proofs:** `diagonal_matrix(+list(number),-list(list(number)))` - `one` ------------------------------------------------------------------------ ###### `diagonal_matrix/3` Constructs the minimal square numeric matrix whose diagonal at the given offset matches the input vector. **Compilation flags:** `static` **Template:** `diagonal_matrix(Diagonal,Offset,Matrix)` **Mode and number of proofs:** `diagonal_matrix(+list(number),+integer,-list(list(number)))` - `one_or_error` **Exceptions:** `Offset` is a variable: `instantiation_error` `Offset` is neither a variable nor an integer: `type_error(integer,Offset)` ------------------------------------------------------------------------ ###### `diagonal_matrix/4` Constructs a square numeric matrix of the requested size whose diagonal at the given offset matches the input vector. **Compilation flags:** `static` **Template:** `diagonal_matrix(Diagonal,Offset,Size,Matrix)` **Mode and number of proofs:** `diagonal_matrix(+list(number),+integer,+integer,-list(list(number)))` - `one_or_error` **Exceptions:** `Offset` is a variable: `instantiation_error` `Offset` is neither a variable nor an integer: `type_error(integer,Offset)` `Size` is a variable: `instantiation_error` `Size` is neither a variable nor an integer: `type_error(integer,Size)` `Size` is an integer that is less than zero: `domain_error(non_negative_integer,Size)` `Size` is smaller than the minimum size required by `Diagonal` and `Offset`: `domain_error(minimum_matrix_size(A),Size)` ------------------------------------------------------------------------ ###### `matrix_trace/2` Computes the trace of a numeric matrix by summing its main diagonal entries. **Compilation flags:** `static` **Template:** `matrix_trace(Matrix,Trace)` **Mode and number of proofs:** `matrix_trace(+list(list(number)),-number)` - `one` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `shift_matrix_diagonal/3` Shifts the main diagonal of a numeric matrix by the given value. **Compilation flags:** `static` **Template:** `shift_matrix_diagonal(Matrix,Shift,ShiftedMatrix)` **Mode and number of proofs:** `shift_matrix_diagonal(+list(list(number)),+number,-list(list(number)))` - `one` **Exceptions:** `Shift` is a variable: `instantiation_error` `Shift` is neither a variable nor a number: `type_error(number,Shift)` ------------------------------------------------------------------------ ###### `upper_triangular_part/2` Returns the upper-triangular part of a numeric matrix including the main diagonal. **Compilation flags:** `static` **Template:** `upper_triangular_part(Matrix,UpperTriangular)` **Mode and number of proofs:** `upper_triangular_part(+list(list(number)),-list(list(number)))` - `one_or_error` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `upper_triangular_part/3` Returns the upper-triangular part of a numeric matrix using the given diagonal offset, where positive offsets exclude leading diagonals and negative offsets include additional subdiagonals. **Compilation flags:** `static` **Template:** `upper_triangular_part(Matrix,Offset,UpperTriangular)` **Mode and number of proofs:** `upper_triangular_part(+list(list(number)),+integer,-list(list(number)))` - `one_or_error` **Exceptions:** `Offset` is a variable: `instantiation_error` `Offset` is neither a variable nor an integer: `type_error(integer,Offset)` `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `lower_triangular_part/2` Returns the lower-triangular part of a numeric matrix including the main diagonal. **Compilation flags:** `static` **Template:** `lower_triangular_part(Matrix,LowerTriangular)` **Mode and number of proofs:** `lower_triangular_part(+list(list(number)),-list(list(number)))` - `one_or_error` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `lower_triangular_part/3` Returns the lower-triangular part of a numeric matrix using the given diagonal offset, where positive offsets include additional superdiagonals and negative offsets exclude leading diagonals below the main diagonal. **Compilation flags:** `static` **Template:** `lower_triangular_part(Matrix,Offset,LowerTriangular)` **Mode and number of proofs:** `lower_triangular_part(+list(list(number)),+integer,-list(list(number)))` - `one_or_error` **Exceptions:** `Offset` is a variable: `instantiation_error` `Offset` is neither a variable nor an integer: `type_error(integer,Offset)` `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `solve_linear_system/3` Solves a non-singular square numeric linear system with a vector right-hand side using pivoted elimination. **Compilation flags:** `static` **Template:** `solve_linear_system(Matrix,Values,Solution)` **Mode and number of proofs:** `solve_linear_system(+list(list(number)),+list(number),-list(float))` - `one_or_error` **Exceptions:** `Matrix` is not a square matrix: `domain_error(square_matrix,Matrix)` `Values` does not have the same length as the size of `Matrix`: `domain_error(vector_length(A),Values)` `Matrix` is singular: `evaluation_error(zero_divisor)` ------------------------------------------------------------------------ ###### `solve_linear_systems/3` Solves a non-singular square numeric linear system with a matrix right-hand side using pivoted elimination. **Compilation flags:** `static` **Template:** `solve_linear_systems(Matrix,RightHandSides,Solutions)` **Mode and number of proofs:** `solve_linear_systems(+list(list(number)),+list(list(number)),-list(list(float)))` - `one_or_error` **Exceptions:** `Matrix` is not a square matrix: `domain_error(square_matrix,Matrix)` `RightHandSides` does not have the same number of rows as the size of `Matrix`: `domain_error(matrix_row_count(A),RightHandSides)` `Matrix` is singular: `evaluation_error(zero_divisor)` ------------------------------------------------------------------------ ###### `determinant/2` Computes the determinant of a square numeric matrix. **Compilation flags:** `static` **Template:** `determinant(Matrix,Determinant)` **Mode and number of proofs:** `determinant(+list(list(number)),-number)` - `one_or_error` **Exceptions:** `Matrix` is not a square matrix: `domain_error(square_matrix,Matrix)` ------------------------------------------------------------------------ ###### `inverse_matrix/2` Computes the inverse of a non-singular square numeric matrix by solving one linear system per identity column. **Compilation flags:** `static` **Template:** `inverse_matrix(Matrix,Inverse)` **Mode and number of proofs:** `inverse_matrix(+list(list(number)),-list(list(float)))` - `one_or_error` **Exceptions:** `Matrix` is not a square matrix: `domain_error(square_matrix,Matrix)` `Matrix` is singular: `evaluation_error(zero_divisor)` ------------------------------------------------------------------------ ###### `qr_decomposition/3` Computes a thin QR decomposition of a rectangular numeric matrix, returning orthogonal columns and an upper-trapezoidal factor. **Compilation flags:** `static` **Template:** `qr_decomposition(Matrix,Orthogonal,UpperTriangular)` **Mode and number of proofs:** `qr_decomposition(+list(list(number)),-list(list(float)),-list(list(float)))` - `one_or_error` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `least_squares/3` Computes a least-squares solution for a rectangular numeric linear system using a pivoted orthogonal solve without forming normal equations. **Compilation flags:** `static` **Template:** `least_squares(Matrix,Values,Solution)` **Mode and number of proofs:** `least_squares(+list(list(number)),+list(number),-list(float))` - `one_or_error` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` `Values` does not have the same length as the number of rows of `Matrix`: `domain_error(vector_length(A),Values)` ------------------------------------------------------------------------ ###### `matrix_rank/2` Estimates the rank of a numeric matrix using the default library numerical tolerance of 1.0e-12. **Compilation flags:** `static` **Template:** `matrix_rank(Matrix,Rank)` **Mode and number of proofs:** `matrix_rank(+list(list(number)),-integer)` - `one_or_error` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `matrix_rank/3` Estimates the rank of a numeric matrix using the given non-negative numerical tolerance. **Compilation flags:** `static` **Template:** `matrix_rank(Matrix,Tolerance,Rank)` **Mode and number of proofs:** `matrix_rank(+list(list(number)),+number,-integer)` - `one_or_error` **Exceptions:** `Tolerance` is a variable: `instantiation_error` `Tolerance` is neither a variable nor a number: `type_error(number,Tolerance)` `Tolerance` is a number but not a non-negative number: `domain_error(non_negative_number,Tolerance)` `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `symmetric_eigen/3` Computes an orthonormal eigendecomposition of a real symmetric dense matrix using the default library numerical tolerance of 1.0e-12. **Compilation flags:** `static` **Template:** `symmetric_eigen(Matrix,Eigenvectors,Eigenvalues)` **Mode and number of proofs:** `symmetric_eigen(+list(list(number)),-list(list(float)),-list(float))` - `one_or_error` **Exceptions:** `Matrix` is not a square matrix: `domain_error(square_matrix,Matrix)` `Matrix` is not symmetric within the default numerical tolerance: `domain_error(symmetric_matrix,Matrix)` ------------------------------------------------------------------------ ###### `symmetric_eigen/4` Computes an orthonormal eigendecomposition of a real symmetric dense matrix using the given non-negative numerical tolerance. **Compilation flags:** `static` **Template:** `symmetric_eigen(Matrix,Tolerance,Eigenvectors,Eigenvalues)` **Mode and number of proofs:** `symmetric_eigen(+list(list(number)),+number,-list(list(float)),-list(float))` - `one_or_error` **Exceptions:** `Tolerance` is a variable: `instantiation_error` `Tolerance` is neither a variable nor a number: `type_error(number,Tolerance)` `Tolerance` is a number but not a non-negative number: `domain_error(non_negative_number,Tolerance)` `Matrix` is not a square matrix: `domain_error(square_matrix,Matrix)` `Matrix` is not symmetric within `Tolerance`: `domain_error(symmetric_matrix,Matrix)` ------------------------------------------------------------------------ ###### `symmetric_eigen/5` Computes an orthonormal eigendecomposition of a real symmetric dense matrix using the given non-negative numerical tolerance and positive iteration bound. **Compilation flags:** `static` **Template:** `symmetric_eigen(Matrix,Tolerance,MaximumIterations,Eigenvectors,Eigenvalues)` **Mode and number of proofs:** `symmetric_eigen(+list(list(number)),+number,+integer,-list(list(float)),-list(float))` - `one_or_error` **Exceptions:** `Tolerance` is a variable: `instantiation_error` `Tolerance` is neither a variable nor a number: `type_error(number,Tolerance)` `Tolerance` is a number but not a non-negative number: `domain_error(non_negative_number,Tolerance)` `MaximumIterations` is a variable: `instantiation_error` `MaximumIterations` is neither a variable nor an integer: `type_error(integer,MaximumIterations)` `MaximumIterations` is an integer that is less than one: `domain_error(positive_integer,MaximumIterations)` `Matrix` is not a square matrix: `domain_error(square_matrix,Matrix)` `Matrix` is not symmetric within `Tolerance`: `domain_error(symmetric_matrix,Matrix)` ------------------------------------------------------------------------ ###### `pseudo_inverse/2` Computes the Moore-Penrose pseudo-inverse of a rectangular numeric matrix using the default library numerical tolerance of 1.0e-12. **Compilation flags:** `static` **Template:** `pseudo_inverse(Matrix,PseudoInverse)` **Mode and number of proofs:** `pseudo_inverse(+list(list(number)),-list(list(float)))` - `one_or_error` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `pseudo_inverse/3` Computes the Moore-Penrose pseudo-inverse of a rectangular numeric matrix using the given non-negative numerical tolerance. **Compilation flags:** `static` **Template:** `pseudo_inverse(Matrix,Tolerance,PseudoInverse)` **Mode and number of proofs:** `pseudo_inverse(+list(list(number)),+number,-list(list(float)))` - `one_or_error` **Exceptions:** `Tolerance` is a variable: `instantiation_error` `Tolerance` is neither a variable nor a number: `type_error(number,Tolerance)` `Tolerance` is a number but not a non-negative number: `domain_error(non_negative_number,Tolerance)` `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `null_space/2` Computes an orthonormal basis for the right null space of a rectangular numeric matrix using the default library numerical tolerance of 1.0e-12. **Compilation flags:** `static` **Template:** `null_space(Matrix,Basis)` **Mode and number of proofs:** `null_space(+list(list(number)),-list(list(float)))` - `one_or_error` **Exceptions:** `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `null_space/3` Computes an orthonormal basis for the right null space of a rectangular numeric matrix using the given non-negative numerical tolerance. **Compilation flags:** `static` **Template:** `null_space(Matrix,Tolerance,Basis)` **Mode and number of proofs:** `null_space(+list(list(number)),+number,-list(list(float)))` - `one_or_error` **Exceptions:** `Tolerance` is a variable: `instantiation_error` `Tolerance` is neither a variable nor a number: `type_error(number,Tolerance)` `Tolerance` is a number but not a non-negative number: `domain_error(non_negative_number,Tolerance)` `Matrix` is not a rectangular matrix: `domain_error(rectangular_matrix,Matrix)` ------------------------------------------------------------------------ ###### `normalize_vector/2` Normalizes a numeric vector to unit length when its norm is above the default library numerical tolerance of 1.0e-12. **Compilation flags:** `static` **Template:** `normalize_vector(Vector,NormalizedVector)` **Mode and number of proofs:** `normalize_vector(+list(number),-list(number))` - `one` ------------------------------------------------------------------------ ###### `normalize_vector/3` Normalizes a numeric vector to unit length when its norm is above the given non-negative numerical tolerance. **Compilation flags:** `static` **Template:** `normalize_vector(Vector,Tolerance,NormalizedVector)` **Mode and number of proofs:** `normalize_vector(+list(number),+number,-list(number))` - `one_or_error` **Exceptions:** `Tolerance` is a variable: `instantiation_error` `Tolerance` is neither a variable nor a number: `type_error(number,Tolerance)` `Tolerance` is a number but not a non-negative number: `domain_error(non_negative_number,Tolerance)` ------------------------------------------------------------------------ ###### `difference_norm/3` Computes the Euclidean norm of the difference between two numeric vectors. **Compilation flags:** `static` **Template:** `difference_norm(Vector1,Vector2,Norm)` **Mode and number of proofs:** `difference_norm(+list(number),+list(number),-float)` - `one` ------------------------------------------------------------------------ ###### `stabilize_vector_sign/2` Normalizes a vector sign convention by flipping vectors whose first significant component is negative. **Compilation flags:** `static` **Template:** `stabilize_vector_sign(Vector,StableVector)` **Mode and number of proofs:** `stabilize_vector_sign(+list(number),-list(number))` - `one` ------------------------------------------------------------------------ ###### `stabilize_vector_sign/3` Normalizes a vector sign convention by flipping vectors whose first significant component under the given non-negative numerical tolerance is negative. **Compilation flags:** `static` **Template:** `stabilize_vector_sign(Vector,Tolerance,StableVector)` **Mode and number of proofs:** `stabilize_vector_sign(+list(number),+number,-list(number))` - `one_or_error` **Exceptions:** `Tolerance` is a variable: `instantiation_error` `Tolerance` is neither a variable nor a number: `type_error(number,Tolerance)` `Tolerance` is a number but not a non-negative number: `domain_error(non_negative_number,Tolerance)` ------------------------------------------------------------------------ ###### `first_significant_component/2` Returns the first component whose absolute value exceeds the default library numerical tolerance of 1.0e-12, defaulting to zero when no such component exists. **Compilation flags:** `static` **Template:** `first_significant_component(Vector,First)` **Mode and number of proofs:** `first_significant_component(+list(number),-number)` - `one` ------------------------------------------------------------------------ ###### `first_significant_component/3` Returns the first component whose absolute value exceeds the given non-negative numerical tolerance, defaulting to zero when no such component exists. **Compilation flags:** `static` **Template:** `first_significant_component(Vector,Tolerance,First)` **Mode and number of proofs:** `first_significant_component(+list(number),+number,-number)` - `one_or_error` **Exceptions:** `Tolerance` is a variable: `instantiation_error` `Tolerance` is neither a variable nor a number: `type_error(number,Tolerance)` `Tolerance` is a number but not a non-negative number: `domain_error(non_negative_number,Tolerance)` ------------------------------------------------------------------------ ###### `add_scaled_outer_product/4` Adds a scaled outer product of a vector with itself to an accumulated matrix. **Compilation flags:** `static` **Template:** `add_scaled_outer_product(Vector,Scale,Matrix0,Matrix)` **Mode and number of proofs:** `add_scaled_outer_product(+list(number),+number,+list(list(number)),-list(list(number)))` - `one` **Exceptions:** `Scale` is a variable: `instantiation_error` `Scale` is neither a variable nor a number: `type_error(number,Scale)` ------------------------------------------------------------------------ ###### `covariance_matrix/2` Computes the sample covariance matrix from a list of centered numeric row vectors. **Compilation flags:** `static` **Template:** `covariance_matrix(Rows,CovarianceMatrix)` **Mode and number of proofs:** `covariance_matrix(+list(list(number)),-list(list(number)))` - `one_or_error` **Exceptions:** `Rows` contains fewer than two rows: `domain_error(minimum_number_of_rows(2),Rows)` ------------------------------------------------------------------------ ###### `cholesky_decomposition/2` Computes the lower-triangular Cholesky factor of a positive definite numeric matrix. **Compilation flags:** `static` **Template:** `cholesky_decomposition(Matrix,CholeskyFactor)` **Mode and number of proofs:** `cholesky_decomposition(+list(list(number)),-list(list(float)))` - `one_or_error` **Exceptions:** `Matrix` is not numerically positive definite: `domain_error(positive_definite_matrix,Matrix)` ------------------------------------------------------------------------ ###### `solve_cholesky/3` Solves a positive definite linear system from a lower-triangular Cholesky factor and a right-hand-side vector. **Compilation flags:** `static` **Template:** `solve_cholesky(CholeskyFactor,Values,Solution)` **Mode and number of proofs:** `solve_cholesky(+list(list(number)),+list(number),-list(float))` - `one` ------------------------------------------------------------------------ ###### `forward_substitution/3` Solves a lower-triangular system by forward substitution. **Compilation flags:** `static` **Template:** `forward_substitution(LowerTriangular,Values,Solution)` **Mode and number of proofs:** `forward_substitution(+list(list(number)),+list(number),-list(float))` - `one` ------------------------------------------------------------------------ ###### `solve_lower_triangular_matrix/3` Solves a lower-triangular system with a matrix right-hand side by forward substitution on each column. **Compilation flags:** `static` **Template:** `solve_lower_triangular_matrix(LowerTriangular,Matrix,Solution)` **Mode and number of proofs:** `solve_lower_triangular_matrix(+list(list(number)),+list(list(number)),-list(list(float)))` - `one` ------------------------------------------------------------------------ ###### `solve_upper_triangular/3` Solves an upper-triangular system by backward substitution. **Compilation flags:** `static` **Template:** `solve_upper_triangular(UpperTriangular,Values,Solution)` **Mode and number of proofs:** `solve_upper_triangular(+list(list(number)),+list(number),-list(float))` - `one` ------------------------------------------------------------------------ ###### `solve_upper_triangular_matrix/3` Solves an upper-triangular system with a matrix right-hand side by backward substitution on each column. **Compilation flags:** `static` **Template:** `solve_upper_triangular_matrix(UpperTriangular,Matrix,Solution)` **Mode and number of proofs:** `solve_upper_triangular_matrix(+list(list(number)),+list(list(number)),-list(list(float)))` - `one` ------------------------------------------------------------------------ ###### `backward_substitution/3` Solves the transposed upper-triangular system induced by a lower-triangular Cholesky factor using backward substitution. **Compilation flags:** `static` **Template:** `backward_substitution(CholeskyFactor,Values,Solution)` **Mode and number of proofs:** `backward_substitution(+list(list(number)),+list(number),-list(float))` - `one` ------------------------------------------------------------------------ ###### `invert_from_cholesky/2` Computes a matrix inverse from a Cholesky factor by solving one linear system per basis column. **Compilation flags:** `static` **Template:** `invert_from_cholesky(CholeskyFactor,Inverse)` **Mode and number of proofs:** `invert_from_cholesky(+list(list(number)),-list(list(float)))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### linear_regression") **object** #### `linear_regression` Linear regression regressor supporting continuous and mixed-feature datasets using a direct ordinary least-squares solve. Learns from a dataset object implementing the `regression_dataset_protocol` protocol and returns a regressor term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(linear_regression(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** format list numberlist type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ridge_regression, knn_regression, regression_tree, random_forest_regression, gradient_boosting_regression ### linear_svm_classifier") **object** #### `linear_svm_classifier` Linear support vector machine classifier supporting binary and multiclass classification using one-vs-rest margin models. Learns from a dataset object implementing the `dataset_protocol` protocol and returns a classifier term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(linear_svm_classifier(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` classifier_common **Uses:** format linear_algebra list numberlist pairs population type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, logistic_regression_classifier, c45_classifier, knn_classifier, naive_bayes_classifier, nearest_centroid_classifier, random_forest_classifier, adaptive_boosting_classifier ### linter_reporter") **object** #### `linter_reporter` Intercepts compiler linter warnings and caches them as machine-readable diagnostics. **Availability:** `logtalk_load(linter_reporter(loader))` **Author:** Paulo Moura **Version:** 1:0:2 **Date:** 2026-07-19 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` tool_diagnostics_common `public` tutor_explanations `public` options **Provides:** logtalk::message_hook/4 **Uses:** list logtalk os term_io type user **Remarks:** > - Usage: Load this tool before compiling code to be checked by the built-in linter. Call `enable/0-1` before compiling code, `disable/0` when finished collecting warnings, and then query the cached warnings using either the legacy warning predicates or the diagnostics protocol predicates. The standalone `sarif` tool can generate SARIF reports by querying these diagnostics. > > - Diagnostics targets: The diagnostics predicates accept the targets `all`, `entity(Entity)`, `file(File)`, `directory(Directory)`, `rdirectory(Directory)`, `library(Library)`, and `rlibrary(Library)`. These targets simply filter the cached diagnostics collected in the current warning collection session. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostic/3  diagnostic_rule/5  diagnostic_rules/1  diagnostic_target/1  diagnostics/2  diagnostics/3  diagnostics_preflight/2  diagnostics_preflight/3  diagnostics_summary/2  diagnostics_summary/3  diagnostics_tool/5  explain//1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `enable/0` - `enable/1` - `disable/0` - `reset/0` - `warning/1` - `warnings/1` - `summary/1` - Protected predicates - Private predicates - `enabled_/0` - `warning_sequence_/1` - `recorded_warning_/4` - `collection_options_/1` - Operators ##### Public predicates ###### `enable/0` Enables warning collection and starts a fresh warning collection session using the default options. **Compilation flags:** `static` **Mode and number of proofs:** `enable` - `one` ------------------------------------------------------------------------ ###### `enable/1` Enables warning collection and starts a fresh warning collection session using the given options. **Compilation flags:** `static` **Template:** `enable(Options)` **Mode and number of proofs:** `enable(+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is not a valid option: `domain_error(option,Option)` ------------------------------------------------------------------------ ###### `disable/0` Disables warning collection while preserving the cached warnings for later querying. **Compilation flags:** `static` **Mode and number of proofs:** `disable` - `one` ------------------------------------------------------------------------ ###### `reset/0` Clears all cached warnings collected in the current session. **Compilation flags:** `static` **Mode and number of proofs:** `reset` - `one` ------------------------------------------------------------------------ ###### `warning/1` Enumerates normalized linter warnings collected in the current session. **Compilation flags:** `static` **Template:** `warning(Warning)` **Mode and number of proofs:** `warning(-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `warnings/1` Returns the collected normalized linter warnings. **Compilation flags:** `static` **Template:** `warnings(Warnings)` **Mode and number of proofs:** `warnings(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `summary/1` Returns a machine-readable summary for the collected linter warnings. **Compilation flags:** `static` **Template:** `summary(Summary)` **Mode and number of proofs:** `summary(-compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `enabled_/0` True when warning collection is enabled. **Compilation flags:** `dynamic` **Mode and number of proofs:** `enabled_` - `zero_or_one` ------------------------------------------------------------------------ ###### `warning_sequence_/1` Stores the last assigned warning sequence number. **Compilation flags:** `dynamic` **Template:** `warning_sequence_(Sequence)` **Mode and number of proofs:** `warning_sequence_(-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `recorded_warning_/4` Caches collected warnings together with their sequence number, flag, normalized message term, and printed message tokens. **Compilation flags:** `dynamic` **Template:** `recorded_warning_(Sequence,Flag,Message,Tokens)` **Mode and number of proofs:** `recorded_warning_(?integer,?atom,?compound,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `collection_options_/1` Stores the merged options for the current warning collection session. **Compilation flags:** `dynamic` **Template:** `collection_options_(Options)` **Mode and number of proofs:** `collection_options_(-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) ### listing") **category** #### `listing` Listing predicates. **Availability:** `logtalk_load(listing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2024-01-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `listing/0` - `listing/1` - `portray_clause/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `listing/0` Lists all clauses of all visible dynamic predicates to the current output stream. **Compilation flags:** `static` **Mode and number of proofs:** `listing` - `one` ------------------------------------------------------------------------ ###### `listing/1` Lists all clauses of a visible dynamic predicate or non-terminal to the current output stream. When the argument is a clause head, lists all matching clauses. **Compilation flags:** `static` **Template:** `listing(Spec)` **Mode and number of proofs:** `listing(+predicate_indicator)` - `one_or_error` `listing(+non_terminal_indicator)` - `one_or_error` `listing(+callable)` - `one_or_error` **Exceptions:** `Spec` is not ground: `instantiation_error` `Spec` is ground but not a valid predicate indicator: `type_error(predicate_indicator,Spec)` `Spec` is ground but not a valid non-terminal indicator: `type_error(non_terminal_indicator,Spec)` `Spec` is a predicate indicator but not a visible predicate: `existence_error(predicate,Spec)` `Spec` is a non-terminal indicator but not a visible non-terminal: `existence_error(non_terminal,Spec)` `Spec` is a callable term with a `Functor/Arity` indicator but not a visible predicate: `existence_error(predicate,Functor/Arity)` `Spec` is a predicate indicator of a visible predicate but not a dynamic predicate: `permission_error(access,predicate,Spec)` `Spec` is a non-terminal indicator of a visible non-terminal but not a dynamic non-terminal: `permission_error(access,non_terminal,Spec)` `Spec` is a callable term for a visible predicate with a `Functor/Arity` indicator but not a dynamic predicate: `permission_error(access,predicate,Functor/Arity)` ------------------------------------------------------------------------ ###### `portray_clause/1` Pretty prints a clause to the current output stream. **Compilation flags:** `static` **Template:** `portray_clause(Clause)` **Mode and number of proofs:** `portray_clause(+clause)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### lof_anomaly_detector") **object** #### `lof_anomaly_detector` Local Outlier Factor anomaly detector with multiple distance metrics, mixed-feature support, and missing-value handling. Learns from baseline training examples selected from a dataset object implementing the `anomaly_dataset_protocol` protocol and returns a detector term that can be used for scoring, prediction, and export. **Availability:** `logtalk_load(lof_anomaly_detector(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` anomaly_detector_common **Uses:** format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  score/3  score_all/3  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_protocol, knn_distance_anomaly_detector, isolation_forest_anomaly_detector ### logging") **object** #### `logger` Global logger object for logging events to files. **Availability:** `logtalk_load(logging(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2011-01-06 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` loggingp **Remarks:** (none) **Inherited public predicates:**  define_log_file/2  disable_logging/1  enable_logging/1  init_log_file/2  log_event/2  log_file/2  logging/1 - Public predicates - Protected predicates - Private predicates - `log_file_/2` - `logging_to_file_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `log_file_/2` Table of log files. **Compilation flags:** `dynamic` **Template:** `log_file_(Alias,File)` **Mode and number of proofs:** `log_file_(?atom,?nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ###### `logging_to_file_/2` Table of logging file status for log files. **Compilation flags:** `dynamic` **Template:** `logging_to_file_(Alias,Status)` **Mode and number of proofs:** `logging_to_file_(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **category** #### `logging` Logging events to files category. **Availability:** `logtalk_load(logging(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2011-01-06 **Compilation flags:** `static` **Implements:** `public` loggingp **Remarks:** (none) **Inherited public predicates:**  define_log_file/2  disable_logging/1  enable_logging/1  init_log_file/2  log_event/2  log_file/2  logging/1 - Public predicates - Protected predicates - Private predicates - `log_file_/2` - `logging_to_file_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `log_file_/2` Table of log files. **Compilation flags:** `dynamic` **Template:** `log_file_(Alias,File)` **Mode and number of proofs:** `log_file_(?atom,?nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ###### `logging_to_file_/2` Table of logging file status for log files. **Compilation flags:** `dynamic` **Template:** `logging_to_file_(Alias,Status)` **Mode and number of proofs:** `logging_to_file_(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `loggingp` Logging events to files protocol. **Availability:** `logtalk_load(logging(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2011-01-06 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `log_file/2` - `define_log_file/2` - `init_log_file/2` - `log_event/2` - `logging/1` - `enable_logging/1` - `disable_logging/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `log_file/2` Access to the table of log files. **Compilation flags:** `static` **Template:** `log_file(Alias,File)` **Mode and number of proofs:** `log_file(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `define_log_file/2` Defines a log file with alias Alias and file name File. If the log file already exists, its contents are kept. Logging is enabled by default. **Compilation flags:** `static` **Template:** `define_log_file(Alias,File)` **Mode and number of proofs:** `define_log_file(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `init_log_file/2` Initializes a new log file with alias Alias and file name File. If the log file already exists, its contents are erased. Logging is enabled by default. **Compilation flags:** `static` **Template:** `init_log_file(Alias,File)` **Mode and number of proofs:** `init_log_file(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `log_event/2` Logs an event Event to a log file with alias Alias. Fails if a log file with alias Alias is not defined. **Compilation flags:** `static` **Template:** `log_event(Alias,Event)` **Mode and number of proofs:** `log_event(+atom,+nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `logging/1` True if logging to file with alias Alias is enabled. **Compilation flags:** `static` **Template:** `logging(Alias)` **Mode and number of proofs:** `logging(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `enable_logging/1` Enables logging to file with alias Alias. Fails if a log file with alias Alias is not defined. **Compilation flags:** `static` **Template:** `enable_logging(Alias)` **Mode and number of proofs:** `enable_logging(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `disable_logging/1` Disables logging to file with alias Alias. Fails if a log file with alias Alias is not defined. **Compilation flags:** `static` **Template:** `disable_logging(Alias)` **Mode and number of proofs:** `disable_logging(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also logging ### logistic_regression_classifier") **object** #### `logistic_regression_classifier` Logistic regression classifier supporting binary and multiclass classification using joint softmax training. Learns from a dataset object implementing the `dataset_protocol` protocol and returns a classifier term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(logistic_regression_classifier(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** format linear_algebra list numberlist pairs population type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, c45_classifier, knn_classifier, naive_bayes_classifier, nearest_centroid_classifier, random_forest_classifier, adaptive_boosting_classifier ### loops") **object** #### `loop` Loop control structures predicates. **Availability:** `logtalk_load(loops(loader))` **Author:** Paulo Moura **Version:** 1:4:1 **Date:** 2020-12-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` loopp **Remarks:** (none) **Inherited public predicates:**  dowhile/2  fordownto/3  fordownto/4  fordownto/5  foreach/3  foreach/4  forto/3  forto/4  forto/5  whiledo/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `loopp` Loop control constructs protocol. **Availability:** `logtalk_load(loops(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2017-03-20 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `whiledo/2` - `dowhile/2` - `foreach/3` - `foreach/4` - `forto/3` - `forto/4` - `forto/5` - `fordownto/3` - `fordownto/4` - `fordownto/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `whiledo/2` While `Condition` is true do `Action`. **Compilation flags:** `static` **Template:** `whiledo(Condition,Action)` **Meta-predicate template:** `whiledo(0,0)` **Mode and number of proofs:** `whiledo(+callable,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `dowhile/2` Do `Action` while `Condition` is true. **Compilation flags:** `static` **Template:** `dowhile(Action,Condition)` **Meta-predicate template:** `dowhile(0,0)` **Mode and number of proofs:** `dowhile(@callable,+callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `foreach/3` For each `Element` in `List` call `Goal`. **Compilation flags:** `static` **Template:** `foreach(Element,List,Goal)` **Meta-predicate template:** `foreach(*,*,0)` **Mode and number of proofs:** `foreach(@var,+list(term),@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `foreach/4` For each `Element` in `List` at position `Index` call `Goal`. `Index` starts at 1. **Compilation flags:** `static` **Template:** `foreach(Element,Index,List,Goal)` **Meta-predicate template:** `foreach(*,*,*,0)` **Mode and number of proofs:** `foreach(@var,@var,+list(term),@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `forto/3` Calls `Goal` counting up from `First` to `Last`. Increment is 1. For convenience, `First` and `Last` can be arithmetic expressions. Fails iff `Goal` fails. **Compilation flags:** `static` **Template:** `forto(First,Last,Goal)` **Meta-predicate template:** `forto(*,*,0)` **Mode and number of proofs:** `forto(+number,+number,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `forto/4` Calls `Goal` counting up from `First` to `Last` and binding `Count` to each successive value. Increment is 1. For convenience, `First` and `Last` can be arithmetic expressions. Fails iff `Goal` fails. **Compilation flags:** `static` **Template:** `forto(Count,First,Last,Goal)` **Meta-predicate template:** `forto(*,*,*,0)` **Mode and number of proofs:** `forto(@var,+number,+number,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `forto/5` Calls `Goal` counting up from `First` to `Last` and binding `Count` to each successive value. For convenience, `First`, `Last`, and `Increment` can be arithmetic expressions (uses `Increment` absolute value). Fails iff `Goal` fails. **Compilation flags:** `static` **Template:** `forto(Count,First,Last,Increment,Goal)` **Meta-predicate template:** `forto(*,*,*,*,0)` **Mode and number of proofs:** `forto(@var,+number,+number,+number,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `fordownto/3` Calls `Goal` counting down from `First` to `Last`. Decrement is 1. For convenience, `First` and `Last` can be arithmetic expressions. Fails iff `Goal` fails. **Compilation flags:** `static` **Template:** `fordownto(First,Last,Goal)` **Meta-predicate template:** `fordownto(*,*,0)` **Mode and number of proofs:** `fordownto(+number,+number,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `fordownto/4` Calls `Goal` counting down from `First` to `Last` and binding `Count` to each successive value. Decrement is 1. For convenience, `First` and `Last` can be arithmetic expressions. Fails iff `Goal` fails. **Compilation flags:** `static` **Template:** `fordownto(Count,First,Last,Goal)` **Meta-predicate template:** `fordownto(*,*,*,0)` **Mode and number of proofs:** `fordownto(@var,+number,+number,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `fordownto/5` Calls `Goal` counting down from `First` to `Last` and binding `Count` to each successive value. For convenience, `First`, `Last`, and `Decrement` can be arithmetic expressions (uses `Decrement` absolute value). Fails iff `Goal` fails. **Compilation flags:** `static` **Template:** `fordownto(Count,First,Last,Decrement,Goal)` **Meta-predicate template:** `fordownto(*,*,*,*,0)` **Mode and number of proofs:** `fordownto(@var,+number,+number,+number,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also loop ### massey_ranker") **object** #### `massey_ranker` Massey pairwise preference ranker. Learns one deterministic rating per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by solving the Massey linear system built from aggregated pairwise outcomes and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(massey_ranker(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common `public` pairwise_strength_ranker_common **Uses:** avltree list numberlist **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, colley_ranker, elo_ranker ### mcp_server") **protocol** #### `mcp_prompt_protocol` Protocol for Logtalk objects that provide prompts to be exposed via an MCP (Model Context Protocol) server. Implements the MCP 2025-06-18 specification. Implementing objects must define the set of prompts available and handle prompt get requests. Prompts are templates for structured LLM interactions that can accept arguments to customize their behavior. **Availability:** `logtalk_load(mcp_server(loader))` **Author:** Paulo Moura **Version:** 0:2:0 **Date:** 2026-02-24 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Capabilities: Objects providing prompts must declare `prompts` in their `capabilities/1` predicate (from the `mcp_tool_protocol` protocol). The server will then advertise the `prompts` capability and handle `prompts/list` and `prompts/get` requests. > > - Prompt descriptors: Each prompt is described by a `prompt(Name,`` ``Description,`` ``Arguments)` or `prompt(Name,`` ``Title,`` ``Description,`` ``Arguments)` term where `Name` is an atom, `Title` is an optional human-friendly display name (an atom), `Description` is a human-readable atom, and `Arguments` is a list of `argument(ArgName,`` ``ArgDescription,`` ``Required)` terms. > > - Prompt messages: The `prompt_get/3` predicate must return a result term containing a list of messages. Each message is a `message(Role,`` ``Content)` term where `Role` is `user` or `assistant` and `Content` is `text(Text)` where `Text` is an atom. **Inherited public predicates:** (none) - Public predicates - `prompts/1` - `prompt_get/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `prompts/1` Returns a list of prompt descriptors available from this object. Each descriptor is a compound term `prompt(Name,`` ``Description,`` ``Arguments)` or `prompt(Name,`` ``Title,`` ``Description,`` ``Arguments)` where `Name` is the MCP prompt name (an atom), `Title` is an optional human-friendly display name (an atom), `Description` is a human-readable description (an atom), and `Arguments` is a list of `argument(ArgName,`` ``ArgDescription,`` ``Required)` terms describing the prompt arguments. `ArgName` and `ArgDescription` are atoms, and `Required` is the boolean `true` or `false`. **Compilation flags:** `static` **Template:** `prompts(Prompts)` **Mode and number of proofs:** `prompts(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `prompt_get/3` Handles a prompt get request. `Name` is the MCP prompt name (as declared in `prompts/1`), `Arguments` is a list of `ArgumentName-Value` pairs provided by the client, and `Result` is unified with the prompt result. The result must be one of: `messages(MessageList)` for a list of prompt messages, or `messages(Description,`` ``MessageList)` to also include a description. Each message in the list must be a `message(Role,`` ``Content)` term where `Role` is `user` or `assistant` and `Content` is `text(Text)` where `Text` is an atom. **Compilation flags:** `static` **Template:** `prompt_get(Name,Arguments,Result)` **Mode and number of proofs:** `prompt_get(+atom,+list(pair),--compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `mcp_resource_protocol` Protocol for Logtalk objects that provide resources to be exposed via an MCP (Model Context Protocol) server. Implements the MCP 2025-06-18 specification. Implementing objects must define the set of resources available and handle resource read requests. Resources expose data and content from the application that MCP clients can access. **Availability:** `logtalk_load(mcp_server(loader))` **Author:** Paulo Moura **Version:** 0:2:0 **Date:** 2026-02-24 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Capabilities: Objects providing resources must declare `resources` in their `capabilities/1` predicate (from the `mcp_tool_protocol` protocol). The server will then advertise the `resources` capability and handle `resources/list` and `resources/read` requests. > > - Resource descriptors: Each resource is described by a `resource(URI,`` ``Name,`` ``Description,`` ``MimeType)` or `resource(URI,`` ``Name,`` ``Title,`` ``Description,`` ``MimeType)` term where `URI` is the resource identifier (an atom), `Name` is a human-readable name (an atom), `Title` is an optional human-friendly display name (an atom), `Description` is a human-readable description (an atom), and `MimeType` is the MIME type of the resource content (an atom, e.g. `'text/plain'`). > > - Resource contents: The `resource_read/3` predicate must return a result term. The result must be `contents(ContentList)` where each item is `text_content(URI,`` ``MimeType,`` ``Text)` for text resources or `blob_content(URI,`` ``MimeType,`` ``Base64Data)` for binary resources encoded as base64. **Inherited public predicates:** (none) - Public predicates - `resources/1` - `resource_read/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `resources/1` Returns a list of resource descriptors available from this object. Each descriptor is a compound term `resource(URI,`` ``Name,`` ``Description,`` ``MimeType)` or `resource(URI,`` ``Name,`` ``Title,`` ``Description,`` ``MimeType)` where `URI` is the resource identifier (an atom, typically a URI like `logtalk://my-app/data`), `Name` is a human-readable name (an atom), `Title` is an optional human-friendly display name (an atom), `Description` is a human-readable description (an atom), and `MimeType` is the MIME type (an atom, e.g. `'text/plain'`, `'application/json'`). **Compilation flags:** `static` **Template:** `resources(Resources)` **Mode and number of proofs:** `resources(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `resource_read/3` Handles a resource read request. `URI` is the resource identifier (as declared in `resources/1`), `Arguments` is a list of `ArgumentName-Value` pairs (currently unused but reserved for future use), and `Result` is unified with the resource result. The result must be `contents(ContentList)` where each content item is either `text_content(URI,`` ``MimeType,`` ``Text)` for text resources or `blob_content(URI,`` ``MimeType,`` ``Base64Data)` for binary resources encoded as base64. `Text` and `Base64Data` must be atoms. **Compilation flags:** `static` **Template:** `resource_read(URI,Arguments,Result)` **Mode and number of proofs:** `resource_read(+atom,+list(pair),--compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `mcp_server` MCP (Model Context Protocol) server for Logtalk applications. Exposes Logtalk objects implementing the `mcp_tool_protocol` and optionally `mcp_prompt_protocol` and `mcp_resource_protocol` protocols as MCP tool, prompt, and resource providers over stdio transport with Content-Length framing. Implements the MCP 2025-03-26 specification. Uses the `json_rpc` library for JSON-RPC 2.0 message handling. **Availability:** `logtalk_load(mcp_server(loader))` **Author:** Paulo Moura **Version:** 0:5:2 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** json_rpc list term_io user **Remarks:** > - MCP specification: Implements the Model Context Protocol 2025-03-26 (https://spec.modelcontextprotocol.io/specification/2025-03-26/). > > - Transport: Uses stdio (standard input/output) with Content-Length header framing as defined by the MCP specification. > > - Version negotiation: During initialization, the server performs protocol version negotiation. The client sends its highest supported version in the `initialize` request. The server selects the highest version it supports that is compatible (i.e., less than or equal to the client version). If no compatible version exists, the server responds with error `-32602` (“Unsupported protocol version”) including a `data` field with the list of supported versions. > > - Capabilities: Supports the tools capability (`tools/list` and `tools/call`). Optionally supports the prompts capability (`prompts/list` and `prompts/get`) when the application declares it via `capabilities/1` and implements `mcp_prompt_protocol`. Optionally supports the resources capability (`resources/list` and `resources/read`) when the application declares it via `capabilities/1` and implements `mcp_resource_protocol`. Optionally supports the elicitation capability (`elicitation/create`) when the application declares it via `capabilities/1`. > > - Tool discovery: Tools are discovered from objects implementing the `mcp_tool_protocol`. Tool metadata (descriptions, parameter schemas) is derived from `info/2` and `mode/2` directives. > > - Prompt discovery: Prompts are discovered from objects implementing the `mcp_prompt_protocol`. Prompt metadata (names, descriptions, arguments) is declared via the `prompts/1` predicate. > > - Resource discovery: Resources are discovered from objects implementing the `mcp_resource_protocol`. Resource metadata (URIs, names, descriptions, MIME types) is declared via the `resources/1` predicate. > > - Auto-dispatch: When an object does not define `tool_call/3` or `tool_call/4` for a tool, the server auto-dispatches: it calls the predicate as a message to the object, collects output-mode arguments, and returns them as text content. > > - Elicitation: When the application declares `elicitation` in its `capabilities/1`, the server constructs an elicit closure and passes it to `tool_call/4`. The closure sends `elicitation/create` requests to the client and reads back the user response. This enables interactive tools that can ask the user questions during execution. > > - Error handling: Predicate failures and exceptions both result in MCP tool-level errors with `isError` set to `true`. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `start/2` - `start/3` - `start/4` - `start/5` - `elicit_request/5` - Protected predicates - Private predicates - `initialized_/0` - `application_/1` - `server_name_/1` - `server_version_/1` - `server_title_/1` - `elicit_counter_/1` - `application_capabilities_/1` - Operators ##### Public predicates ###### `start/2` Starts the MCP server with the given server name and application object. The application object must implement the `mcp_tool_protocol` protocol. Reads JSON-RPC messages from standard input and writes responses to standard output using Content-Length framing. Blocks until the client disconnects or an exit signal is received. **Compilation flags:** `static` **Template:** `start(Name,Application)` **Mode and number of proofs:** `start(+atom,+object_identifier)` - `one` ------------------------------------------------------------------------ ###### `start/3` Starts the MCP server with the given server name, application object, and options. Currently supported options: `server_version(Version)` to set the server version (default `'1.0.0'`), `server_title(Title)` to set the server display title (default `''`, omitted when empty). **Compilation flags:** `static` **Template:** `start(Name,Application,Options)` **Mode and number of proofs:** `start(+atom,+object_identifier,+list)` - `one` ------------------------------------------------------------------------ ###### `start/4` Starts the MCP server with custom input and output streams. Useful for testing or non-stdio transports. Uses default options. **Compilation flags:** `static` **Template:** `start(Name,Application,Input,Output)` **Mode and number of proofs:** `start(+atom,+object_identifier,+stream,+stream)` - `one` ------------------------------------------------------------------------ ###### `start/5` Starts the MCP server with custom input and output streams and options. **Compilation flags:** `static` **Template:** `start(Name,Application,Input,Output,Options)` **Mode and number of proofs:** `start(+atom,+object_identifier,+stream,+stream,+list)` - `one` ------------------------------------------------------------------------ ###### `elicit_request/5` Sends an `elicitation/create` request to the MCP client and reads the response. `Input` and `Output` are the I/O streams. `Message` is the prompt text (an atom). `RequestedSchema` is a curly-term JSON Schema describing the input to request from the user (e.g., `{type-object,`` ``properties-{answer-{type-string,`` ``enum-[yes,`` ``no]}},`` ``required-[answer]}`). `Answer` is unified with `accept(Content)` (where `Content` is the user response as a curly-term), `decline`, or `cancel`. This predicate is typically not called directly but through the elicit closure passed to `tool_call/4`. **Compilation flags:** `static` **Template:** `elicit_request(Input,Output,Message,RequestedSchema,Answer)` **Mode and number of proofs:** `elicit_request(+stream,+stream,+atom,+compound,--compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `initialized_/0` Flag indicating that the server has been initialized. **Compilation flags:** `dynamic` **Mode and number of proofs:** `initialized_` - `zero_or_one` ------------------------------------------------------------------------ ###### `application_/1` Current application object. **Compilation flags:** `dynamic` **Template:** `application_(Application)` **Mode and number of proofs:** `application_(?object_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `server_name_/1` Current server name. **Compilation flags:** `dynamic` **Template:** `server_name_(Name)` **Mode and number of proofs:** `server_name_(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `server_version_/1` Current server version. **Compilation flags:** `dynamic` **Template:** `server_version_(Version)` **Mode and number of proofs:** `server_version_(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `server_title_/1` Current server display title. **Compilation flags:** `dynamic` **Template:** `server_title_(Title)` **Mode and number of proofs:** `server_title_(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `elicit_counter_/1` Counter for elicitation request identifiers. **Compilation flags:** `dynamic` **Template:** `elicit_counter_(Counter)` **Mode and number of proofs:** `elicit_counter_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `application_capabilities_/1` Cached application capabilities list. **Compilation flags:** `dynamic` **Template:** `application_capabilities_(Capabilities)` **Mode and number of proofs:** `application_capabilities_(?list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `mcp_tool_protocol` Protocol for Logtalk objects that provide tools to be exposed via an MCP (Model Context Protocol) server. Implements the MCP 2025-06-18 specification. Implementing objects must define the set of tools available and handle tool calls. Tool metadata (names, titles, descriptions, parameter schemas) can be derived automatically from `info/2` and `mode/2` directives on the tool predicates, or can be specified explicitly via the `tool/1` predicate. **Availability:** `logtalk_load(mcp_server(loader))` **Author:** Paulo Moura **Version:** 0:3:0 **Date:** 2026-02-24 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Capabilities: Objects can optionally define `capabilities/1` to declare which MCP capabilities they require. Currently supported: `elicitation` (allows the server to ask the user questions during tool execution via MCP elicitation). If `capabilities/1` is not defined, only the `tools` capability is advertised. > > - Tool title: The tool title (human-friendly display name) is derived from a `title` key in the predicate `info/2` directive. If not specified, the predicate name (functor) is used as the title. > > - Structured output: Tools can declare an output schema via `output_schema/2` and return `structured(StructuredContent)` or `structured(ContentItems,`` ``StructuredContent)` results. The structured content is included in the `structuredContent` field of the tool call response alongside the `content` array. > > - Resource links: Tool results can include `resource_link(URI,`` ``Name)` or `resource_link(URI,`` ``Name,`` ``Description,`` ``MimeType)` content items in `results/1` lists. > > - Elicitation: Tools that need user interaction during execution should define `tool_call/4` instead of `tool_call/3`. The extra argument is an elicitation closure that can be called as `call(Elicit,`` ``Message,`` ``Schema,`` ``Answer)` where `Message` is the prompt text (an atom), `Schema` is a JSON Schema curly-term for the requested input, and `Answer` is unified with `accept(Content)`, `decline`, or `cancel`. **Inherited public predicates:** (none) - Public predicates - `capabilities/1` - `tools/1` - `tool_call/3` - `tool_call/4` - `output_schema/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `capabilities/1` Returns a list of MCP capabilities required by this tool provider. Currently supported capabilities: `elicitation` (server can ask the user questions during tool execution). If not defined, only the `tools` capability is advertised. The server uses this to build the `capabilities` field in the `initialize` response. **Compilation flags:** `static` **Template:** `capabilities(Capabilities)` **Mode and number of proofs:** `capabilities(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `tools/1` Returns a list of tool descriptors available from this object. Each descriptor is a compound term `tool(Name,`` ``Functor,`` ``Arity)` where `Name` is the MCP tool name (an atom), `Functor` is the predicate functor, and `Arity` is the predicate arity. By default, the tool name is the predicate functor. Tool titles are derived from `info/2` `title` keys (falling back to the predicate name). Tool descriptions and parameter schemas are derived from the `info/2` and `mode/2` directives of the corresponding predicates. **Compilation flags:** `static` **Template:** `tools(Tools)` **Mode and number of proofs:** `tools(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `tool_call/3` Handles a tool call. `Name` is the MCP tool name (as declared in `tools/1`), `Arguments` is a list of `ArgumentName-Value` pairs, and `Result` is unified with the tool result. The result must be one of: `text(Atom)` for a text result, `error(Atom)` for an error result, `results(List)` for a list of content items where each item is `text(Atom)`, `error(Atom)`, `resource_link(URI,`` ``Name)`, or `resource_link(URI,`` ``Name,`` ``Description,`` ``MimeType)`, `structured(StructuredContent)` for structured output with auto-generated text, or `structured(ContentItems,`` ``StructuredContent)` for structured output with explicit content items. If this predicate is not defined for a tool, the MCP server will use auto-dispatch: it calls the tool predicate as a message to the implementing object, collects output arguments, and returns them as a text result. **Compilation flags:** `static` **Template:** `tool_call(Name,Arguments,Result)` **Mode and number of proofs:** `tool_call(+atom,+list(pair),--compound)` - `one` ------------------------------------------------------------------------ ###### `tool_call/4` Handles a tool call with elicitation support. Same as `tool_call/3` but receives an `Elicit` closure as the third argument. The closure can be called as `call(Elicit,`` ``Message,`` ``Schema,`` ``Answer)` where `Message` is a prompt text (an atom), `Schema` is a curly-term JSON Schema describing the requested input (e.g., `{type-object,`` ``properties-{answer-{type-string,`` ``enum-[yes,`` ``no]}},`` ``required-[answer]}`), and `Answer` is unified with `accept(Content)` (where `Content` is the user response as a curly-term), `decline`, or `cancel`. Only available when the application declares `elicitation` in its `capabilities/1`. Falls back to `tool_call/3` and then auto-dispatch if not defined. **Compilation flags:** `static` **Template:** `tool_call(Name,Arguments,Elicit,Result)` **Mode and number of proofs:** `tool_call(+atom,+list(pair),+callable,--compound)` - `one` ------------------------------------------------------------------------ ###### `output_schema/2` Returns the JSON output schema for the given tool name. Optional; when defined, the schema is included in the tool descriptor as `outputSchema` and the tool can return `structured(StructuredContent)` or `structured(ContentItems,`` ``StructuredContent)` results. The schema must be a curly-term following JSON Schema format (e.g. `{type-object,`` ``properties-{temperature-{type-number}},`` ``required-[temperature]}`). **Compilation flags:** `static` **Template:** `output_schema(Name,Schema)` **Mode and number of proofs:** `output_schema(+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### memcached") **object** #### `memcached` Portable Memcached client implementing the text (ASCII) protocol. Uses the sockets library for TCP communication. **Availability:** `logtalk_load(memcached(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list socket user **Remarks:** > - Supported backends: ECLiPSe, GNU Prolog, SICStus Prolog, SWI-Prolog, and Trealla Prolog (same as the sockets library). > > - Protocol version: Implements the Memcached text (ASCII) protocol as documented in the official protocol.txt specification. > > - Connection: The default Memcached port is 11211. Connections are represented as opaque handles that should be passed to all other predicates. > > - Keys: Keys are atoms up to 250 characters. They must not include control characters or whitespace. > > - Flags: Flags are 32-bit unsigned integers stored alongside the data, opaque to the server. > > - Expiration: Expiration time in seconds. 0 means never expire. Values over 30 days (2592000) are treated as Unix timestamps. > > - Storage commands: Supports set, add, replace, append, prepend, and cas (check-and-set). > > - Retrieval commands: Supports get, gets (with CAS token), gat, and gats (get-and-touch). > > - Other commands: Supports delete, incr/decr, touch, flush_all, version, stats, and quit. **Inherited public predicates:** (none) - Public predicates - `connect/3` - `connect/2` - `disconnect/1` - `set/5` - `set/3` - `add/5` - `replace/5` - `append/3` - `prepend/3` - `cas/6` - `get/3` - `get/4` - `gets/4` - `gets/5` - `mget/3` - `delete/2` - `incr/4` - `decr/4` - `touch/3` - `gat/4` - `gats/5` - `flush_all/1` - `flush_all/2` - `version/2` - `stats/2` - `stats/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `connect/3` Connects to a Memcached server at the given host and port. Returns a connection handle for subsequent operations. **Compilation flags:** `static` **Template:** `connect(Host,Port,Connection)` **Mode and number of proofs:** `connect(+atom,+integer,--compound)` - `one_or_error` **Exceptions:** Connection refused or network error: `memcached_error(connection_failed)` ------------------------------------------------------------------------ ###### `connect/2` Connects to a Memcached server at the given host on the default port (11211). Returns a connection handle for subsequent operations. **Compilation flags:** `static` **Template:** `connect(Host,Connection)` **Mode and number of proofs:** `connect(+atom,--compound)` - `one_or_error` **Exceptions:** Connection refused or network error: `memcached_error(connection_failed)` ------------------------------------------------------------------------ ###### `disconnect/1` Disconnects from the Memcached server. Sends a quit command before closing. **Compilation flags:** `static` **Template:** `disconnect(Connection)` **Mode and number of proofs:** `disconnect(+compound)` - `one` ------------------------------------------------------------------------ ###### `set/5` Stores the data unconditionally. Overwrites any existing data for the key. **Compilation flags:** `static` **Template:** `set(Connection,Key,Value,Flags,ExpTime)` **Mode and number of proofs:** `set(+compound,+atom,+atom,+integer,+integer)` - `one_or_error` **Exceptions:** Storage failed: `memcached_error(not_stored)` Network error: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `set/3` Stores the data unconditionally with default flags (0) and no expiration (0). **Compilation flags:** `static` **Template:** `set(Connection,Key,Value)` **Mode and number of proofs:** `set(+compound,+atom,+atom)` - `one_or_error` **Exceptions:** Storage failed: `memcached_error(not_stored)` Network error: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `add/5` Stores the data only if the key does not already exist. **Compilation flags:** `static` **Template:** `add(Connection,Key,Value,Flags,ExpTime)` **Mode and number of proofs:** `add(+compound,+atom,+atom,+integer,+integer)` - `one_or_error` **Exceptions:** Key already exists: `memcached_error(not_stored)` Network error: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `replace/5` Stores the data only if the key already exists. **Compilation flags:** `static` **Template:** `replace(Connection,Key,Value,Flags,ExpTime)` **Mode and number of proofs:** `replace(+compound,+atom,+atom,+integer,+integer)` - `one_or_error` **Exceptions:** Key does not exist: `memcached_error(not_stored)` Network error: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `append/3` Appends the data to the end of an existing item’s data. **Compilation flags:** `static` **Template:** `append(Connection,Key,Value)` **Mode and number of proofs:** `append(+compound,+atom,+atom)` - `one_or_error` **Exceptions:** Key does not exist: `memcached_error(not_stored)` Network error: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `prepend/3` Prepends the data to the beginning of an existing item’s data. **Compilation flags:** `static` **Template:** `prepend(Connection,Key,Value)` **Mode and number of proofs:** `prepend(+compound,+atom,+atom)` - `one_or_error` **Exceptions:** Key does not exist: `memcached_error(not_stored)` Network error: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `cas/6` Stores the data only if no one else has updated it since the given CAS unique value was obtained (via gets/3). **Compilation flags:** `static` **Template:** `cas(Connection,Key,Value,Flags,ExpTime,CasUnique)` **Mode and number of proofs:** `cas(+compound,+atom,+atom,+integer,+integer,+integer)` - `one_or_error` **Exceptions:** CAS value mismatch (item modified by another client): `memcached_error(exists)` Key does not exist: `memcached_error(not_found)` Network error: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `get/3` Retrieves the value associated with the key. Fails if the key is not found. **Compilation flags:** `static` **Template:** `get(Connection,Key,Value)` **Mode and number of proofs:** `get(+compound,+atom,-atom)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `get` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `get/4` Retrieves the value and flags associated with the key. Fails if the key is not found. **Compilation flags:** `static` **Template:** `get(Connection,Key,Value,Flags)` **Mode and number of proofs:** `get(+compound,+atom,-atom,-integer)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `get` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `gets/4` Retrieves the value and CAS unique token for the key. Fails if the key is not found. The CAS value is used with the cas/6 predicate. **Compilation flags:** `static` **Template:** `gets(Connection,Key,Value,CasUnique)` **Mode and number of proofs:** `gets(+compound,+atom,-atom,-integer)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `gets` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `gets/5` Retrieves the value, flags, and CAS unique token for the key. Fails if the key is not found. **Compilation flags:** `static` **Template:** `gets(Connection,Key,Value,Flags,CasUnique)` **Mode and number of proofs:** `gets(+compound,+atom,-atom,-integer,-integer)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `gets` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `mget/3` Retrieves multiple keys at once. Returns a list of `item(Key,`` ``Value,`` ``Flags)` terms for found keys. **Compilation flags:** `static` **Template:** `mget(Connection,Keys,Items)` **Mode and number of proofs:** `mget(+compound,+list(atom),-list(compound))` - `one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the multi-key retrieval command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `delete/2` Deletes the item with the given key. Fails if the key is not found. **Compilation flags:** `static` **Template:** `delete(Connection,Key)` **Mode and number of proofs:** `delete(+compound,+atom)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `delete` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `incr/4` Increments the numeric value of the given key by the specified amount. Returns the new value. The item must already exist and contain a decimal representation of a 64-bit unsigned integer. Fails if the key is not found. **Compilation flags:** `static` **Template:** `incr(Connection,Key,Amount,NewValue)` **Mode and number of proofs:** `incr(+compound,+atom,+integer,-integer)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `incr` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `decr/4` Decrements the numeric value of the given key by the specified amount. Returns the new value. Underflow is caught: decrementing below 0 yields 0. Fails if the key is not found. **Compilation flags:** `static` **Template:** `decr(Connection,Key,Amount,NewValue)` **Mode and number of proofs:** `decr(+compound,+atom,+integer,-integer)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `decr` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `touch/3` Updates the expiration time of the given key without fetching the data. Fails if the key is not found. **Compilation flags:** `static` **Template:** `touch(Connection,Key,ExpTime)` **Mode and number of proofs:** `touch(+compound,+atom,+integer)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `touch` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `gat/4` Gets the value of the key and updates its expiration time. Fails if the key is not found. **Compilation flags:** `static` **Template:** `gat(Connection,Key,ExpTime,Value)` **Mode and number of proofs:** `gat(+compound,+atom,+integer,-atom)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `gat` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `gats/5` Gets the value and CAS unique token of the key and updates its expiration time. Fails if the key is not found. **Compilation flags:** `static` **Template:** `gats(Connection,Key,ExpTime,Value,CasUnique)` **Mode and number of proofs:** `gats(+compound,+atom,+integer,-atom,-integer)` - `zero_or_one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `gats` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `flush_all/1` Invalidates all existing items immediately. **Compilation flags:** `static` **Template:** `flush_all(Connection)` **Mode and number of proofs:** `flush_all(+compound)` - `one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `flush_all` command: `memcached_error(Error)` The server replies with an error to the `flush_all` command: `memcached_error(server_error(Message))` ------------------------------------------------------------------------ ###### `flush_all/2` Invalidates all existing items after the specified number of seconds. **Compilation flags:** `static` **Template:** `flush_all(Connection,Delay)` **Mode and number of proofs:** `flush_all(+compound,+integer)` - `one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the delayed `flush_all` command: `memcached_error(Error)` The server replies with an error to the delayed `flush_all` command: `memcached_error(server_error(Message))` ------------------------------------------------------------------------ ###### `version/2` Returns the version string of the Memcached server. **Compilation flags:** `static` **Template:** `version(Connection,Version)` **Mode and number of proofs:** `version(+compound,-atom)` - `one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `version` command: `memcached_error(Error)` The server replies with an unexpected or error response to the `version` command: `memcached_error(server_error(Message))` ------------------------------------------------------------------------ ###### `stats/2` Returns general-purpose statistics as a list of `stat(Name,`` ``Value)` terms. **Compilation flags:** `static` **Template:** `stats(Connection,Stats)` **Mode and number of proofs:** `stats(+compound,-list(compound))` - `one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the `stats` command: `memcached_error(Error)` ------------------------------------------------------------------------ ###### `stats/3` Returns statistics for the given argument (e.g. `items`, `slabs`, `sizes`) as a list of `stat(Name,`` ``Value)` terms. **Compilation flags:** `static` **Template:** `stats(Connection,Argument,Stats)` **Mode and number of proofs:** `stats(+compound,+atom,-list(compound))` - `one_or_error` **Exceptions:** Network or stream I/O error while sending or reading the parameterized `stats` command: `memcached_error(Error)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### message_pack") **object** #### `message_pack(StringRepresentation)` - `StringRepresentation` - Text representation to be used when decoding MessagePack strings. Possible values are `atom` (default), `chars`, and `codes`. MessagePack format exporter and importer. **Availability:** `logtalk_load(message_pack(loader))` **Author:** Paulo Moura **Version:** 1:1:1 **Date:** 2026-06-14 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ieee_754(Precision,ByteOrder,NaNRepresentation) list type utf_8 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a list of bytes in the MessagePack format returning the corresponding term representation. Throws an error when parsing is not possible (usually due to an invalid byte sequence). **Compilation flags:** `static` **Template:** `parse(Bytes,Term)` **Mode and number of proofs:** `parse(@list(byte),-ground)` - `one_or_error` **Exceptions:** `Bytes` is not ground: `instantiation_error` `Bytes` is ground but not a valid MessagePack byte sequence: `domain_error(message_pack_byte_sequence,Bytes)` ------------------------------------------------------------------------ ###### `generate/2` Generates a list of bytes in the MessagePack format representing the given term. Throws an error when generating is not possible (usually due to a term with no corresponding MessagePack representation). **Compilation flags:** `static` **Template:** `generate(Term,Bytes)` **Mode and number of proofs:** `generate(@ground,-list(byte))` - `one_or_error` **Exceptions:** `Term` is a variable: `instantiation_error` `Term` has no corresponding MessagePack representation: `domain_error(message_pack_term,Term)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### meta") **object** #### `meta` Some useful meta-predicates. **Availability:** `logtalk_load(meta(loader))` **Author:** Paulo Moura **Version:** 5:2:0 **Date:** 2016-10-06 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` metap **Aliases:** `metap` `map/2` as `succeeds/2` `metap` `map/2` as `maplist/2` `metap` `map/3` as `maplist/3` `metap` `map/4` as `maplist/4` `metap` `map/5` as `maplist/5` `metap` `map/6` as `maplist/6` `metap` `map/7` as `maplist/7` `metap` `map/8` as `maplist/8` `metap` `include/3` as `filter/3` `metap` `fold_left/4` as `foldl/4` `metap` `fold_left_1/3` as `foldl1/3` `metap` `fold_right/4` as `foldr/4` `metap` `fold_right_1/3` as `foldr1/3` `metap` `scan_left/4` as `scanl/4` `metap` `scan_left_1/3` as `scanl1/3` `metap` `scan_right/4` as `scanr/4` `metap` `scan_right_1/3` as `scanr1/3` **Remarks:** (none) **Inherited public predicates:**  exclude/3  findall_member/4  findall_member/5  fold_left/4  fold_left_1/3  fold_right/4  fold_right_1/3  include/3  map/2  map/3  map/4  map/5  map/6  map/7  map/8  map_reduce/5  partition/4  partition/6  scan_left/4  scan_left_1/3  scan_right/4  scan_right_1/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also meta_compiler **protocol** #### `metap` Useful meta-predicates protocol. **Availability:** `logtalk_load(meta(loader))` **Author:** Paulo Moura **Version:** 6:1:0 **Date:** 2015-12-23 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `include/3` - `exclude/3` - `findall_member/4` - `findall_member/5` - `partition/4` - `partition/6` - `fold_left/4` - `fold_left_1/3` - `scan_left/4` - `scan_left_1/3` - `fold_right/4` - `fold_right_1/3` - `scan_right/4` - `scan_right_1/3` - `map/2` - `map/3` - `map/4` - `map/5` - `map/6` - `map/7` - `map/8` - `map_reduce/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `include/3` Returns a list of all list elements that satisfy a predicate. **Compilation flags:** `static` **Template:** `include(Closure,List,Included)` **Meta-predicate template:** `include(1,*,*)` **Mode and number of proofs:** `include(+callable,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `exclude/3` Returns a list of all list elements that fail to satisfy a predicate. **Compilation flags:** `static` **Template:** `exclude(Closure,List,Excluded)` **Meta-predicate template:** `exclude(1,*,*)` **Mode and number of proofs:** `exclude(+callable,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `findall_member/4` Finds all members of a list that satisfy a given test. **Compilation flags:** `static` **Template:** `findall_member(Member,List,Test,Result)` **Meta-predicate template:** `findall_member(*,*,0,*)` **Mode and number of proofs:** `findall_member(@term,+list,@callable,-list)` - `one` ------------------------------------------------------------------------ ###### `findall_member/5` Finds all members of a list that satisfy a given test appending the given tail to the result. **Compilation flags:** `static` **Template:** `findall_member(Member,List,Test,Result,Tail)` **Meta-predicate template:** `findall_member(*,*,0,*,*)` **Mode and number of proofs:** `findall_member(@term,+list,@callable,-list,+list)` - `one` ------------------------------------------------------------------------ ###### `partition/4` Partition a list of elements in two lists using a predicate. **Compilation flags:** `static` **Template:** `partition(Closure,List,Included,Excluded)` **Meta-predicate template:** `partition(1,*,*,*)` **Mode and number of proofs:** `partition(+callable,+list,-list,-list)` - `one` ------------------------------------------------------------------------ ###### `partition/6` Partitions a list in lists with values less, equal, and greater than a given value using a comparison predicate with the same argument order as `compare/3`. **Compilation flags:** `static` **Template:** `partition(Closure,List,Value,Less,Equal,Greater)` **Meta-predicate template:** `partition(3,*,*,*,*,*)` **Mode and number of proofs:** `partition(+callable,+list,@term,-list,-list,-list)` - `one` ------------------------------------------------------------------------ ###### `fold_left/4` List folding (left associative). Closure is extended with three arguments: accumulator, list element, and updated accumulator. **Compilation flags:** `static` **Template:** `fold_left(Closure,Accumulator,List,Result)` **Meta-predicate template:** `fold_left(3,*,*,*)` **Mode and number of proofs:** `fold_left(+callable,?term,+list,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `fold_left_1/3` List folding (left associative). Closure is extended with three arguments: accumulator, list element, and updated accumulator. The initial value of the accumulator is the list first element. Fails for empty lists. **Compilation flags:** `static` **Template:** `fold_left_1(Closure,List,Result)` **Meta-predicate template:** `fold_left_1(3,*,*)` **Mode and number of proofs:** `fold_left_1(+callable,+list,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `scan_left/4` List scanning (left associative). Closure is extended with three arguments: accumulator, list element, and updated accumulator. **Compilation flags:** `static` **Template:** `scan_left(Closure,Accumulator,List,Results)` **Meta-predicate template:** `scan_left(3,*,*,*)` **Mode and number of proofs:** `scan_left(+callable,?term,+list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `scan_left_1/3` List scanning (left associative). Closure is extended with three arguments: accumulator, list element, and updated accumulator. The accumulator is initialized with the list first element. Fails for empty lists. **Compilation flags:** `static` **Template:** `scan_left_1(Closure,List,Results)` **Meta-predicate template:** `scan_left_1(3,*,*)` **Mode and number of proofs:** `scan_left_1(+callable,+list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `fold_right/4` List folding (right associative). Closure is extended with three arguments: list element, accumulator, and updated accumulator. **Compilation flags:** `static` **Template:** `fold_right(Closure,Accumulator,List,Result)` **Meta-predicate template:** `fold_right(3,*,*,*)` **Mode and number of proofs:** `fold_right(+callable,?term,+list,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `fold_right_1/3` List folding (right associative). Closure is extended with three arguments: list element, accumulator, and updated accumulator. The initial value of the accumulator is the list first element. Fails for empty lists. **Compilation flags:** `static` **Template:** `fold_right_1(Closure,List,Result)` **Meta-predicate template:** `fold_right_1(3,*,*)` **Mode and number of proofs:** `fold_right_1(+callable,+list,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `scan_right/4` List scanning (right associative). Closure is extended with three arguments: list element, accumulator, and updated accumulator. **Compilation flags:** `static` **Template:** `scan_right(Closure,Accumulator,List,Results)` **Meta-predicate template:** `scan_right(3,*,*,*)` **Mode and number of proofs:** `scan_right(+callable,?term,+list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `scan_right_1/3` List scanning (right associative). Closure is extended with three arguments: list element, accumulator, and updated accumulator. The accumulator is initialized with the list first element. Fails for empty lists. **Compilation flags:** `static` **Template:** `scan_right_1(Closure,List,Results)` **Meta-predicate template:** `scan_right_1(3,*,*)` **Mode and number of proofs:** `scan_right_1(+callable,+list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map/2` True if the predicate succeeds for each list element. **Compilation flags:** `static` **Template:** `map(Closure,List)` **Meta-predicate template:** `map(1,*)` **Mode and number of proofs:** `map(+callable,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map/3` List mapping predicate taken arguments from two lists of elements. **Compilation flags:** `static` **Template:** `map(Closure,List1,List2)` **Meta-predicate template:** `map(2,*,*)` **Mode and number of proofs:** `map(+callable,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map/4` List mapping predicate taken arguments from three lists of elements. **Compilation flags:** `static` **Template:** `map(Closure,List1,List2,List3)` **Meta-predicate template:** `map(3,*,*,*)` **Mode and number of proofs:** `map(+callable,?list,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map/5` List mapping predicate taken arguments from four lists of elements. **Compilation flags:** `static` **Template:** `map(Closure,List1,List2,List3,List4)` **Meta-predicate template:** `map(4,*,*,*,*)` **Mode and number of proofs:** `map(+callable,?list,?list,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map/6` List mapping predicate taken arguments from five lists of elements. **Compilation flags:** `static` **Template:** `map(Closure,List1,List2,List3,List4,List5)` **Meta-predicate template:** `map(5,*,*,*,*,*)` **Mode and number of proofs:** `map(+callable,?list,?list,?list,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map/7` List mapping predicate taken arguments from six lists of elements. **Compilation flags:** `static` **Template:** `map(Closure,List1,List2,List3,List4,List5,List6)` **Meta-predicate template:** `map(6,*,*,*,*,*,*)` **Mode and number of proofs:** `map(+callable,?list,?list,?list,?list,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map/8` List mapping predicate taken arguments from seven lists of elements. **Compilation flags:** `static` **Template:** `map(Closure,List1,List2,List3,List4,List5,List6,List7)` **Meta-predicate template:** `map(7,*,*,*,*,*,*,*)` **Mode and number of proofs:** `map(+callable,?list,?list,?list,?list,?list,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `map_reduce/5` Map a list and apply a fold left (reduce) to the resulting list. **Compilation flags:** `static` **Template:** `map_reduce(Map,Reduce,Accumulator,List,Result)` **Meta-predicate template:** `map_reduce(2,3,*,*,*)` **Mode and number of proofs:** `map_reduce(+callable,+callable,+term,?list,?term)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also meta ### meta_compiler") **object** #### `meta_compiler` Compiler for the `meta` object meta-predicates. Generates auxiliary predicates in order to avoid meta-call overheads. **Availability:** `logtalk_load(meta_compiler(loader))` **Author:** Paulo Moura **Version:** 0:16:1 **Date:** 2026-04-22 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Uses:** gensym list logtalk user **Remarks:** > - Usage: Compile source files with calls to the `meta` object meta-predicates using the compiler option `hook(meta_compiler)`. **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - `generated_predicate_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `generated_predicate_/1` Table of generated auxiliary predicates. **Compilation flags:** `dynamic` **Template:** `generated_predicate_(Predicate)` **Mode and number of proofs:** `generated_predicate_(?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also meta ### metagol") **object** #### `metagol` Inductive logic programming (ILP) system based on meta-interpretive learning. **Availability:** `logtalk_load(metagol(loader))` **Author:** Metagol authors; adapted to Logtalk by Paulo Moura. **Version:** 0:24:4 **Date:** 2024-03-15 **Copyright:** Copyright 2016 Metagol authors; Copyright 2018-2024 Paulo Moura **License:** BSD-3-Clause **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Provides:** logtalk::message_tokens//2 logtalk::message_prefix_stream/4 **Uses:** coroutining integer list logtalk meta timeout **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - `learn/3` - `learn/2` - `learn_seq/2` - `learn_with_timeout/4` - `program_to_clauses/2` - `pprint/1` - `metarule/6` - `head_pred/1` - `body_pred/1` - `ibk/3` - `func_test/3` - `functional/0` - `min_clauses/1` - `max_clauses/1` - `max_inv_preds/1` - `metarule_next_id/1` - `timeout/1` - Protected predicates - `pprint_clause/1` - `pprint_clauses/1` - `compiled_pred_call/2` - `body_pred_call/2` - `type/3` - Private predicates - Operators ##### Public predicates ###### `learn/3` Learns from a set of positive examples and a set of negative examples and returns the learned program. **Compilation flags:** `static` **Template:** `learn(PositiveExamples,NegativeExamples,Program)` **Mode and number of proofs:** `learn(@list(example),@list(example),-list(term))` - `zero_or_more` ------------------------------------------------------------------------ ###### `learn/2` Learns from a set of positive examples and a set of negative examples and pretty prints the learned program. **Compilation flags:** `static` **Template:** `learn(PositiveExamples,NegativeExamples)` **Mode and number of proofs:** `learn(@list(example),@list(example))` - `zero_or_more` ------------------------------------------------------------------------ ###### `learn_seq/2` Learns from a sequence of examples represented as a list of PositiveExamples/NegativeExamples elements and returns the learned program. **Compilation flags:** `static` **Template:** `learn_seq(Examples,Program)` **Mode and number of proofs:** `learn_seq(@list(example),-list(clause))` - `zero_or_one` ------------------------------------------------------------------------ ###### `learn_with_timeout/4` Learns from a set of positive examples and a set of negative examples and returns the learned program constrained by the given timeout or its default value. **Compilation flags:** `static` **Template:** `learn_with_timeout(PositiveExamples,NegativeExamples,Program,Timeout)` **Mode and number of proofs:** `learn_with_timeout(@list(example),@list(example),-list(term),+number)` - `zero_or_one_or_error` `learn_with_timeout(@list(example),@list(example),-list(term),-number)` - `zero_or_one_or_error` **Exceptions:** Learning does not complete in the allowed time: `timeout(learn(PositiveExamples,NegativeExamples,Program))` ------------------------------------------------------------------------ ###### `program_to_clauses/2` Converts a learned program into a list of clauses. **Compilation flags:** `static` **Template:** `program_to_clauses(Program,Clauses)` **Mode and number of proofs:** `program_to_clauses(@list(term),-list(clause))` - `one` ------------------------------------------------------------------------ ###### `pprint/1` Pretty prints a learned program. **Compilation flags:** `static` **Template:** `pprint(Program)` **Mode and number of proofs:** `pprint(@list(term))` - `one` ------------------------------------------------------------------------ ###### `metarule/6` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `head_pred/1` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `body_pred/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `ibk/3` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `func_test/3` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `functional/0` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `min_clauses/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `max_clauses/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `max_inv_preds/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `metarule_next_id/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `timeout/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ##### Protected predicates ###### `pprint_clause/1` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `pprint_clauses/1` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `compiled_pred_call/2` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `body_pred_call/2` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `type/3` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `metagol_example_protocol` Convenient learning predicates for use in examples and unit tests. **Availability:** `logtalk_load(metagol(loader))` **Author:** Paulo Moura. **Version:** 0:1:1 **Date:** 2024-03-15 **License:** BSD-3-Clause **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `learn/1` - `learn/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `learn/1` Learns and returns set of clauses. **Compilation flags:** `static` **Template:** `learn(Clauses)` **Mode and number of proofs:** `learn(-list(clause))` - `zero_or_more` ------------------------------------------------------------------------ ###### `learn/0` Learns and prints a set of clauses. **Compilation flags:** `static` **Mode and number of proofs:** `learn` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### mime_types") **object** #### `mime_types` MIME type registry and convenience predicates for mapping file names and URLs to media types. **Availability:** `logtalk_load(mime_types(loader))` **Author:** Paulo Moura **Version:** 1:1:1 **Date:** 2026-06-01 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list os reader string(Representation) **Remarks:** > - Default behavior: Convenience predicates default to lenient lookup by consulting both built-in standard mappings and built-in common mappings. > > - Path decomposition: File path decomposition uses the `os` library `decompose_file_name/4` predicate. > > - External overlays: Additional `mime.types`-style files can be loaded into the in-memory registry using the `load/1-2` predicates. **Inherited public predicates:** (none) - Public predicates - `guess_type/3` - `guess_type/4` - `guess_file_type/3` - `guess_file_type/4` - `extension_type/2` - `extension_type/3` - `guess_extension/2` - `guess_extension/3` - `guess_all_extensions/2` - `guess_all_extensions/3` - `add_type/2` - `add_type/3` - `read_mime_types/2` - `load/1` - `load/2` - `reset/0` - `suffix_alias/2` - `encoding_suffix/2` - Protected predicates - Private predicates - `runtime_type_/3` - Operators ##### Public predicates ###### `guess_type/3` Guesses the MIME type and content encoding for a URL or file name using lenient lookup. Unknown values are returned as the empty atom. **Compilation flags:** `static` **Template:** `guess_type(Resource,Type,Encoding)` **Mode and number of proofs:** `guess_type(+atom,-atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `guess_type/4` Guesses the MIME type and content encoding for a URL or file name. When `Strict` is `true`, only built-in standard mappings and strict runtime overlays are consulted. **Compilation flags:** `static` **Template:** `guess_type(Resource,Type,Encoding,Strict)` **Mode and number of proofs:** `guess_type(+atom,-atom,-atom,+boolean)` - `one` ------------------------------------------------------------------------ ###### `guess_file_type/3` Guesses the MIME type and content encoding for a file path using lenient lookup. Unknown values are returned as the empty atom. **Compilation flags:** `static` **Template:** `guess_file_type(Path,Type,Encoding)` **Mode and number of proofs:** `guess_file_type(+atom,-atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `guess_file_type/4` Guesses the MIME type and content encoding for a file path. **Compilation flags:** `static` **Template:** `guess_file_type(Path,Type,Encoding,Strict)` **Mode and number of proofs:** `guess_file_type(+atom,-atom,-atom,+boolean)` - `one` ------------------------------------------------------------------------ ###### `extension_type/2` Returns the MIME type associated with a file extension using lenient lookup. **Compilation flags:** `static` **Template:** `extension_type(Extension,Type)` **Mode and number of proofs:** `extension_type(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `extension_type/3` Returns the MIME type associated with a file extension. **Compilation flags:** `static` **Template:** `extension_type(Extension,Type,Strict)` **Mode and number of proofs:** `extension_type(+atom,-atom,+boolean)` - `zero_or_one` ------------------------------------------------------------------------ ###### `guess_extension/2` Returns the preferred file extension associated with a MIME type using lenient lookup. **Compilation flags:** `static` **Template:** `guess_extension(Type,Extension)` **Mode and number of proofs:** `guess_extension(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `guess_extension/3` Returns the preferred file extension associated with a MIME type. **Compilation flags:** `static` **Template:** `guess_extension(Type,Extension,Strict)` **Mode and number of proofs:** `guess_extension(+atom,-atom,+boolean)` - `zero_or_one` ------------------------------------------------------------------------ ###### `guess_all_extensions/2` Returns all known file extensions associated with a MIME type using lenient lookup. **Compilation flags:** `static` **Template:** `guess_all_extensions(Type,Extensions)` **Mode and number of proofs:** `guess_all_extensions(+atom,-list(atom))` - `one` ------------------------------------------------------------------------ ###### `guess_all_extensions/3` Returns all known file extensions associated with a MIME type. **Compilation flags:** `static` **Template:** `guess_all_extensions(Type,Extensions,Strict)` **Mode and number of proofs:** `guess_all_extensions(+atom,-list(atom),+boolean)` - `one` ------------------------------------------------------------------------ ###### `add_type/2` Adds a lenient runtime mapping from a MIME type to a file extension. **Compilation flags:** `static` **Template:** `add_type(Type,Extension)` **Mode and number of proofs:** `add_type(+atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `add_type/3` Adds a runtime mapping from a MIME type to a file extension. **Compilation flags:** `static` **Template:** `add_type(Type,Extension,Strict)` **Mode and number of proofs:** `add_type(+atom,+atom,+boolean)` - `one` ------------------------------------------------------------------------ ###### `read_mime_types/2` Reads a `mime.types`-style file returning a list of `Extension-Type` pairs. **Compilation flags:** `static` **Template:** `read_mime_types(File,Pairs)` **Mode and number of proofs:** `read_mime_types(+atom,-list(pair(atom,atom)))` - `one` ------------------------------------------------------------------------ ###### `load/1` Loads a `mime.types`-style file as a lenient runtime overlay. **Compilation flags:** `static` **Template:** `load(File)` **Mode and number of proofs:** `load(+atom)` - `one` ------------------------------------------------------------------------ ###### `load/2` Loads a `mime.types`-style file as a strict or lenient runtime overlay. **Compilation flags:** `static` **Template:** `load(File,Strict)` **Mode and number of proofs:** `load(+atom,+boolean)` - `one` ------------------------------------------------------------------------ ###### `reset/0` Clears all runtime MIME type overlays. **Compilation flags:** `static` **Mode and number of proofs:** `reset` - `one` ------------------------------------------------------------------------ ###### `suffix_alias/2` Returns suffix aliases used before splitting encoding and type suffixes. **Compilation flags:** `static` **Template:** `suffix_alias(Alias,Expanded)` **Mode and number of proofs:** `suffix_alias(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `encoding_suffix/2` Returns content-encoding suffix mappings. **Compilation flags:** `static` **Template:** `encoding_suffix(Extension,Encoding)` **Mode and number of proofs:** `encoding_suffix(?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `runtime_type_/3` Table of runtime MIME type overlays. **Compilation flags:** `dynamic` **Template:** `runtime_type_(Strict,Extension,Type)` **Mode and number of proofs:** `runtime_type_(?boolean,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### modified_z_score_anomaly_detector") **object** #### `modified_z_score_anomaly_detector` Statistical modified Z-score anomaly detector for continuous datasets. Learns per-attribute sample median and median absolute deviation from baseline training examples selected from a dataset object implementing the `anomaly_dataset_protocol` protocol and returns a detector term that can be used for scoring, prediction, and export. **Availability:** `logtalk_load(modified_z_score_anomaly_detector(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` anomaly_detector_common **Uses:** format list numberlist pairs sample type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  score/3  score_all/3  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_protocol, z_score_anomaly_detector, isolation_forest_anomaly_detector, knn_distance_anomaly_detector, lof_anomaly_detector ### multisets") **object** #### `multisets` Implementation of multiset operations with repetition over lists. **Availability:** `logtalk_load(multisets(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` multisets_protocol **Uses:** fast_random(Algorithm) list natural **Remarks:** (none) **Inherited public predicates:**  count_distinct_multisets/3  count_multisets/3  distinct_multiset/3  distinct_multiset/4  distinct_multiset_index/4  distinct_multisets/3  distinct_multisets/4  multiset/3  multiset/4  multiset_index/4  multiset_index/5  multisets/3  multisets/4  next_multiset/3  nth_distinct_multiset/4  nth_multiset/4  nth_multiset/5  previous_multiset/3  random_distinct_multiset/3  random_multiset/3  sample_distinct_multisets/4  sample_multisets/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `multisets_protocol` Protocol for multiset operations over lists. **Availability:** `logtalk_load(multisets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-12 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `multisets/3` - `multiset/3` - `multisets/4` - `multiset/4` - `distinct_multisets/3` - `distinct_multiset/3` - `distinct_multisets/4` - `distinct_multiset/4` - `nth_multiset/4` - `nth_multiset/5` - `multiset_index/4` - `multiset_index/5` - `count_multisets/3` - `count_distinct_multisets/3` - `nth_distinct_multiset/4` - `distinct_multiset_index/4` - `random_multiset/3` - `sample_multisets/4` - `random_distinct_multiset/3` - `sample_distinct_multisets/4` - `next_multiset/3` - `previous_multiset/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `multisets/3` Generates all K-multisets (unordered K-element selections with replacement) of a list using default order. **Compilation flags:** `static` **Template:** `multisets(K,List,Multisets)` **Mode and number of proofs:** `multisets(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `multiset/3` True iff the third argument is a K-multiset with replacement of a list using default order. **Compilation flags:** `static` **Template:** `multiset(K,List,Multiset)` **Mode and number of proofs:** `multiset(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `multisets/4` Generates all K-multisets with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `multisets(K,List,Order,Multisets)` **Mode and number of proofs:** `multisets(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `multiset/4` True iff the fourth argument is a K-multiset with replacement with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `multiset(K,List,Order,Multiset)` **Mode and number of proofs:** `multiset(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_multisets/3` Generates all distinct K-multisets (deduplicating repeated values in the input list) using default order. **Compilation flags:** `static` **Template:** `distinct_multisets(K,List,Multisets)` **Mode and number of proofs:** `distinct_multisets(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_multiset/3` True iff the third argument is a distinct K-multiset with replacement of a list using default order. **Compilation flags:** `static` **Template:** `distinct_multiset(K,List,Multiset)` **Mode and number of proofs:** `distinct_multiset(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_multisets/4` Generates all distinct K-multisets with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_multisets(K,List,Order,Multisets)` **Mode and number of proofs:** `distinct_multisets(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_multiset/4` True iff the fourth argument is a distinct K-multiset with replacement with the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_multiset(K,List,Order,Multiset)` **Mode and number of proofs:** `distinct_multiset(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `nth_multiset/4` Returns the K-multiset at a given zero-based index using default order. **Compilation flags:** `static` **Template:** `nth_multiset(K,List,Index,Multiset)` **Mode and number of proofs:** `nth_multiset(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_multiset/5` Returns the K-multiset at a given zero-based index in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `nth_multiset(K,List,Order,Index,Multiset)` **Mode and number of proofs:** `nth_multiset(+integer,+list,+atom,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `multiset_index/4` Returns the zero-based index of a K-multiset using default order. **Compilation flags:** `static` **Template:** `multiset_index(K,List,Multiset,Index)` **Mode and number of proofs:** `multiset_index(+integer,+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `multiset_index/5` Returns the zero-based index of a K-multiset in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `multiset_index(K,List,Order,Multiset,Index)` **Mode and number of proofs:** `multiset_index(+integer,+list,+atom,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `count_multisets/3` Counts the number of K-multisets with replacement of a list. **Compilation flags:** `static` **Template:** `count_multisets(K,List,Count)` **Mode and number of proofs:** `count_multisets(+integer,+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `count_distinct_multisets/3` Counts the number of distinct K-multisets with replacement of a list (deduplicating repeated values in the input list). **Compilation flags:** `static` **Template:** `count_distinct_multisets(K,List,Count)` **Mode and number of proofs:** `count_distinct_multisets(+integer,+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `nth_distinct_multiset/4` Returns the distinct K-multiset at a given zero-based index in default generation order. **Compilation flags:** `static` **Template:** `nth_distinct_multiset(K,List,Index,Multiset)` **Mode and number of proofs:** `nth_distinct_multiset(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_multiset_index/4` Returns the zero-based index of a distinct K-multiset in default generation order. **Compilation flags:** `static` **Template:** `distinct_multiset_index(K,List,Multiset,Index)` **Mode and number of proofs:** `distinct_multiset_index(+integer,+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_multiset/3` Returns a random K-multiset with replacement of a list. **Compilation flags:** `static` **Template:** `random_multiset(K,List,Multiset)` **Mode and number of proofs:** `random_multiset(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_multisets/4` Returns SampleCount random K-multisets with replacement of a list, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_multisets(K,List,SampleCount,Samples)` **Mode and number of proofs:** `sample_multisets(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_distinct_multiset/3` Returns a random distinct K-multiset with replacement of a list (deduplicating repeated values in the input list). **Compilation flags:** `static` **Template:** `random_distinct_multiset(K,List,Multiset)` **Mode and number of proofs:** `random_distinct_multiset(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_distinct_multisets/4` Returns SampleCount random distinct K-multisets with replacement of a list, sampled with replacement after deduplicating repeated values in the input list. **Compilation flags:** `static` **Template:** `sample_distinct_multisets(K,List,SampleCount,Samples)` **Mode and number of proofs:** `sample_distinct_multisets(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next_multiset/3` Returns the next distinct multiset value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `next_multiset(List,Multiset,Next)` **Mode and number of proofs:** `next_multiset(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_multiset/3` Returns the previous distinct multiset value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `previous_multiset(List,Multiset,Previous)` **Mode and number of proofs:** `previous_multiset(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### mutation_testing") **object** #### `arithmetic_operator_replacement(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting clauses to mutate. - `ClauseIndex` - 1-based clause index for the selected mutation (equal to `Occurrence` for this mutator). - `Occurrence` - 1-based mutation occurrence index to target within selected predicate clauses. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `arithmetic_operator_replacement` mutator for matching predicate clauses. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` clause_mutator_protocol **Imports:** `public` mutator_common **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `body_goal_negation(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting clauses to mutate. - `ClauseIndex` - 1-based clause index for the selected mutation (equal to `Occurrence` for this mutator). - `Occurrence` - 1-based mutation occurrence index to target within selected predicate clauses. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the body_goal_negation mutator by negating matching predicate clause bodies. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` clause_mutator_protocol **Imports:** `public` mutator_common **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `clause_mutator_protocol` Marker protocol for clause and grammar-rule mutators. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static` **Extends:** `public` mutator_protocol **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  mutation/2  reset/0 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `clauses_reordering(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting clauses to mutate. - `ClauseIndex` - 1-based clause index selecting which clause is swapped with its successor (last swaps with first). - `Occurrence` - 1-based clause index selecting which clause is swapped with its successor (last swaps with first). - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `clauses_reordering` mutator by reordering the clauses of a non-discontiguous predicate or non-terminal definition. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-07 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` clause_mutator_protocol **Imports:** `public` mutator_common **Uses:** list **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - `clauses_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `clauses_/1` Table of parsed clauses. **Compilation flags:** `dynamic` **Template:** `clauses_(Clause)` **Mode and number of proofs:** `clauses_(?clause)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `directive_mutator_protocol` Marker protocol for directive mutators. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static` **Extends:** `public` mutator_protocol **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  mutation/2  reset/0 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `fail_insertion(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting clauses to mutate. - `ClauseIndex` - 1-based clause index for the selected mutation (equal to `Occurrence` for this mutator). - `Occurrence` - 1-based mutation occurrence index to target within selected predicate clauses. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `fail_insertion` mutator by inserting fail at deterministic body positions for matching predicate clauses. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` clause_mutator_protocol **Imports:** `public` mutator_common **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `head_arguments_mutation(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting clauses to mutate. - `ClauseIndex` - 1-based clause index for the selected mutation (equal to `Occurrence` for this mutator). - `Occurrence` - 1-based mutation occurrence index selecting one compile-time bound head argument to mutate. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `head_arguments_mutation` mutator by mutating one compile-time bound predicate/non-terminal head argument using the `type::mutation/3` predicate. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` clause_mutator_protocol **Imports:** `public` mutator_common **Uses:** type **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `head_arguments_reordering(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting clauses to mutate. - `ClauseIndex` - 1-based clause index for the selected mutation (equal to `Occurrence` for this mutator). - `Occurrence` - 1-based mutation occurrence index to target within selected predicate clauses. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `head_arguments_reordering` mutator by swapping the first two arguments in matching rule or grammar rule heads. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` clause_mutator_protocol **Imports:** `public` mutator_common **Uses:** list **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `mutation_testing` Mutation testing tool. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-07-22 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Provides:** logtalk::message_hook/4 **Uses:** fast_random(Algorithm) json(ObjectRepresentation,PairRepresentation,StringRepresentation) list logtalk os term_io type user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `library/1` - `library/2` - `directory/1` - `directory/2` - `entity/1` - `entity/2` - `predicate/2` - `predicate/3` - `report_entity/3` - `report_predicate/4` - `report_library/3` - `report_directory/3` - `format_report/3` - `format_report/2` - `format_report/1` - `entity_mutants/2` - `entity_mutants/3` - `predicate_mutants/3` - `predicate_mutants/4` - `library_mutants/2` - `library_mutants/3` - `directory_mutants/2` - `directory_mutants/3` - Protected predicates - Private predicates - `probe_mutation_happened_/0` - `probing_/0` - `capturing_mutated_terms_/0` - `captured_mutated_terms_/5` - `baseline_coverage_/4` - Operators ##### Public predicates ###### `library/1` Runs mutation testing for all loaded entities from a given library using default options. **Compilation flags:** `static` **Template:** `library(Library)` **Mode and number of proofs:** `library(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `library/2` Runs mutation testing for all loaded entities from a given library using the given options. **Compilation flags:** `static` **Template:** `library(Library,Options)` **Mode and number of proofs:** `library(+atom,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `directory/1` Runs mutation testing for all loaded entities from a given directory using default options. **Compilation flags:** `static` **Template:** `directory(Directory)` **Mode and number of proofs:** `directory(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `directory/2` Runs mutation testing for all loaded entities from a given directory using the given options. **Compilation flags:** `static` **Template:** `directory(Directory,Options)` **Mode and number of proofs:** `directory(+atom,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity/1` Runs mutation testing for a loaded entity using default options. **Compilation flags:** `static` **Template:** `entity(Entity)` **Mode and number of proofs:** `entity(+entity_identifier)` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity/2` Runs mutation testing for a loaded entity using the given options. **Compilation flags:** `static` **Template:** `entity(Entity,Options)` **Mode and number of proofs:** `entity(+entity_identifier,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `predicate/2` Runs mutation testing for a loaded entity predicate using default options. **Compilation flags:** `static` **Template:** `predicate(Entity,Predicate)` **Mode and number of proofs:** `predicate(+entity_identifier,+predicate_indicator)` - `zero_or_one` ------------------------------------------------------------------------ ###### `predicate/3` Runs mutation testing for a loaded entity predicate using the given options. **Compilation flags:** `static` **Template:** `predicate(Entity,Predicate,Options)` **Mode and number of proofs:** `predicate(+entity_identifier,+predicate_indicator,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `report_entity/3` Runs mutation testing for an entity and returns a structured report term. **Compilation flags:** `static` **Template:** `report_entity(Entity,Report,Options)` **Mode and number of proofs:** `report_entity(+entity_identifier,-compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `report_predicate/4` Runs mutation testing for an entity predicate and returns a structured report term. **Compilation flags:** `static` **Template:** `report_predicate(Entity,Predicate,Report,Options)` **Mode and number of proofs:** `report_predicate(+entity_identifier,+predicate_indicator,-compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `report_library/3` Runs mutation testing for loaded entities from a library and returns structured report terms. **Compilation flags:** `static` **Template:** `report_library(Library,Report,Options)` **Mode and number of proofs:** `report_library(+atom,-compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `report_directory/3` Runs mutation testing for loaded entities from a directory and returns structured report terms. **Compilation flags:** `static` **Template:** `report_directory(Directory,Report,Options)` **Mode and number of proofs:** `report_directory(+atom,-compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `format_report/3` Formats a mutation testing report term to the given stream using the given format. **Compilation flags:** `static` **Template:** `format_report(Stream,Format,Report)` **Mode and number of proofs:** `format_report(+stream_or_alias,+atom,+compound)` - `one` ------------------------------------------------------------------------ ###### `format_report/2` Formats a mutation testing report term to the current output stream using the given format. **Compilation flags:** `static` **Template:** `format_report(Format,Report)` **Mode and number of proofs:** `format_report(+atom,+compound)` - `one` ------------------------------------------------------------------------ ###### `format_report/1` Formats a mutation testing report term to the current output stream using the text format. **Compilation flags:** `static` **Template:** `format_report(Report)` **Mode and number of proofs:** `format_report(+compound)` - `one` ------------------------------------------------------------------------ ###### `entity_mutants/2` Returns the deterministic list of mutants for an entity using default options. **Compilation flags:** `static` **Template:** `entity_mutants(Entity,Mutants)` **Mode and number of proofs:** `entity_mutants(+entity_identifier,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `entity_mutants/3` Returns the deterministic list of mutants for an entity using the given options. **Compilation flags:** `static` **Template:** `entity_mutants(Entity,Mutants,Options)` **Mode and number of proofs:** `entity_mutants(+entity_identifier,-list(compound),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `predicate_mutants/3` Returns the deterministic list of mutants for an entity predicate using default options. **Compilation flags:** `static` **Template:** `predicate_mutants(Entity,Predicate,Mutants)` **Mode and number of proofs:** `predicate_mutants(+entity_identifier,+predicate_indicator,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `predicate_mutants/4` Returns the deterministic list of mutants for an entity predicate using the given options. **Compilation flags:** `static` **Template:** `predicate_mutants(Entity,Predicate,Mutants,Options)` **Mode and number of proofs:** `predicate_mutants(+entity_identifier,+predicate_indicator,-list(compound),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `library_mutants/2` Returns the deterministic list of mutants for loaded entities from a given library using default options. **Compilation flags:** `static` **Template:** `library_mutants(Library,Mutants)` **Mode and number of proofs:** `library_mutants(+atom,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `library_mutants/3` Returns the deterministic list of mutants for loaded entities from a given library using the given options. **Compilation flags:** `static` **Template:** `library_mutants(Library,Mutants,Options)` **Mode and number of proofs:** `library_mutants(+atom,-list(compound),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `directory_mutants/2` Returns the deterministic list of mutants for loaded entities from a given directory using default options. **Compilation flags:** `static` **Template:** `directory_mutants(Directory,Mutants)` **Mode and number of proofs:** `directory_mutants(+atom,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `directory_mutants/3` Returns the deterministic list of mutants for loaded entities from a given directory using the given options. **Compilation flags:** `static` **Template:** `directory_mutants(Directory,Mutants,Options)` **Mode and number of proofs:** `directory_mutants(+atom,-list(compound),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `probe_mutation_happened_/0` True iff a mutation happened. **Compilation flags:** `dynamic` **Mode and number of proofs:** `probe_mutation_happened_` - `zero_or_one` ------------------------------------------------------------------------ ###### `probing_/0` True iff we are currently probing for mutations (suppresses printing). **Compilation flags:** `dynamic` **Mode and number of proofs:** `probing_` - `zero_or_one` ------------------------------------------------------------------------ ###### `capturing_mutated_terms_/0` True iff we are capturing original and mutated terms while formatting reports. **Compilation flags:** `dynamic` **Mode and number of proofs:** `capturing_mutated_terms_` - `zero_or_one` ------------------------------------------------------------------------ ###### `captured_mutated_terms_/5` Captured original and mutated terms, variable names, and source location for one mutant. **Compilation flags:** `dynamic` **Template:** `captured_mutated_terms_(Original,Mutation,Variables,File,Lines)` **Mode and number of proofs:** `captured_mutated_terms_(-callable,-callable,-list,-atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `baseline_coverage_/4` Coverage baseline cache for an entity and predicate: covered clauses and total clauses. **Compilation flags:** `dynamic` **Template:** `baseline_coverage_(Entity,Predicate,CoveredClauses,TotalClauses)` **Mode and number of proofs:** `baseline_coverage_(?entity_identifier,?predicate_indicator,?list(integer),?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **category** #### `mutation_testing_messages` Default message translations for the `mutation_testing` tool. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-06 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `mutator_common` Mutator common predicate utilities. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static` **Implements:** `public` mutator_protocol **Uses:** logtalk **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  mutation/2  reset/0 - Public predicates - Protected predicates - `print_mutation/3` - `target_predicate/3` - `target_predicate_clause_index/4` - `target_scope_directive/3` - `target_scope_directive_index/4` - `target_predicate_directive/3` - `target_predicate_directive_index/4` - `target_uses_directive/3` - `target_uses_directive_index/4` - `next_occurrence/1` - Private predicates - `current_predicate_clause_index_/2` - `update_target_predicate_clause_index_/2` - `current_scope_directive_index_/2` - `update_target_scope_directive_index_/2` - `current_predicate_directive_index_/2` - `update_target_predicate_directive_index_/2` - `current_uses_directive_index_/2` - `update_target_uses_directive_index_/2` - `seen_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `print_mutation/3` Prints a term and its mutation when `Flag` is true. Succeeds otherwise. **Compilation flags:** `static` **Template:** `print_mutation(Flag,Original,Mutation)` **Mode and number of proofs:** `print_mutation(+boolean,@callable,@callable)` - `one` ------------------------------------------------------------------------ ###### `target_predicate/3` True iff `Term` is a candidate for mutation. **Compilation flags:** `static` **Template:** `target_predicate(Term,Entity,Predicate)` **Mode and number of proofs:** `target_predicate(@callable,@entity_identifier,@predicate_indicator)` - `one` ------------------------------------------------------------------------ ###### `target_predicate_clause_index/4` True iff `Term` is a candidate for mutation while also returning its current 1-based contiguous clause index for the matching predicate or non-terminal. **Compilation flags:** `static` **Template:** `target_predicate_clause_index(Term,Entity,Predicate,ClauseIndex)` **Mode and number of proofs:** `target_predicate_clause_index(@callable,@entity_identifier,@predicate_indicator,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `target_scope_directive/3` True iff `Term` is a matching predicate or non-terminal scope directive candidate for mutation. **Compilation flags:** `static` **Template:** `target_scope_directive(Term,Entity,Predicate)` **Mode and number of proofs:** `target_scope_directive(@callable,@entity_identifier,@predicate_indicator)` - `one` ------------------------------------------------------------------------ ###### `target_scope_directive_index/4` True iff `Term` is a matching predicate or non-terminal scope directive candidate for mutation while also returning its 1-based index among matching scope directives for the selected predicate or non-terminal. **Compilation flags:** `static` **Template:** `target_scope_directive_index(Term,Entity,Predicate,DirectiveIndex)` **Mode and number of proofs:** `target_scope_directive_index(@callable,@entity_identifier,@predicate_indicator,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `target_predicate_directive/3` True iff `Term` is a matching predicate or non-terminal directive candidate for mutation. **Compilation flags:** `static` **Template:** `target_predicate_directive(Term,Entity,Predicate)` **Mode and number of proofs:** `target_predicate_directive(@callable,@entity_identifier,@predicate_indicator)` - `one` ------------------------------------------------------------------------ ###### `target_predicate_directive_index/4` True iff `Term` is a matching predicate or non-terminal directive candidate for mutation while also returning its 1-based index among matching directives for the selected predicate or non-terminal. **Compilation flags:** `static` **Template:** `target_predicate_directive_index(Term,Entity,Predicate,DirectiveIndex)` **Mode and number of proofs:** `target_predicate_directive_index(@callable,@entity_identifier,@predicate_indicator,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `target_uses_directive/3` True iff `Term` is a matching `uses/2` directive candidate for mutation. **Compilation flags:** `static` **Template:** `target_uses_directive(Term,Entity,Predicate)` **Mode and number of proofs:** `target_uses_directive(@callable,@entity_identifier,@predicate_indicator)` - `one` ------------------------------------------------------------------------ ###### `target_uses_directive_index/4` True iff `Term` is a matching `uses/2` directive candidate for mutation while also returning its 1-based index among matching directives for the selected predicate or non-terminal. **Compilation flags:** `static` **Template:** `target_uses_directive_index(Term,Entity,Predicate,DirectiveIndex)` **Mode and number of proofs:** `target_uses_directive_index(@callable,@entity_identifier,@predicate_indicator,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next_occurrence/1` Next mutation occurrence. **Compilation flags:** `static` **Template:** `next_occurrence(Occurrence)` **Mode and number of proofs:** `next_occurrence(-integer)` - `one` ------------------------------------------------------------------------ ##### Private predicates ###### `current_predicate_clause_index_/2` Table of current clause indexes per predicate. **Compilation flags:** `dynamic` **Template:** `current_predicate_clause_index_(Predicate,ClauseIndex)` **Mode and number of proofs:** `current_predicate_clause_index_(?predicate_indicator,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update_target_predicate_clause_index_/2` Updates and returns the next clause index for the given predicate. **Compilation flags:** `static` **Template:** `update_target_predicate_clause_index_(Predicate,ClauseIndex)` **Mode and number of proofs:** `update_target_predicate_clause_index_(@predicate_indicator,-integer)` - `one` ------------------------------------------------------------------------ ###### `current_scope_directive_index_/2` Table of current scope directive indexes per predicate. **Compilation flags:** `dynamic` **Template:** `current_scope_directive_index_(Predicate,DirectiveIndex)` **Mode and number of proofs:** `current_scope_directive_index_(?predicate_indicator,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update_target_scope_directive_index_/2` Updates and returns the next scope directive index for the given predicate. **Compilation flags:** `static` **Template:** `update_target_scope_directive_index_(Predicate,DirectiveIndex)` **Mode and number of proofs:** `update_target_scope_directive_index_(@predicate_indicator,-integer)` - `one` ------------------------------------------------------------------------ ###### `current_predicate_directive_index_/2` Table of current predicate directive indexes per predicate. **Compilation flags:** `dynamic` **Template:** `current_predicate_directive_index_(Predicate,DirectiveIndex)` **Mode and number of proofs:** `current_predicate_directive_index_(?predicate_indicator,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update_target_predicate_directive_index_/2` Updates and returns the next predicate directive index for the given predicate. **Compilation flags:** `static` **Template:** `update_target_predicate_directive_index_(Predicate,DirectiveIndex)` **Mode and number of proofs:** `update_target_predicate_directive_index_(@predicate_indicator,-integer)` - `one` ------------------------------------------------------------------------ ###### `current_uses_directive_index_/2` Table of current uses directive indexes per predicate. **Compilation flags:** `dynamic` **Template:** `current_uses_directive_index_(Predicate,DirectiveIndex)` **Mode and number of proofs:** `current_uses_directive_index_(?predicate_indicator,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update_target_uses_directive_index_/2` Updates and returns the next uses directive index for the given predicate. **Compilation flags:** `static` **Template:** `update_target_uses_directive_index_(Predicate,DirectiveIndex)` **Mode and number of proofs:** `update_target_uses_directive_index_(@predicate_indicator,-integer)` - `one` ------------------------------------------------------------------------ ###### `seen_/1` Table of last seen mutation occurrence. **Compilation flags:** `dynamic` **Template:** `seen_(Occurrence)` **Mode and number of proofs:** `seen_(?integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `mutator_protocol` Mutator protocol. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-07 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `reset/0` - `mutation/2` - `coverage_clause_mutator/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `reset/0` Resets any mutator internal state used while expanding terms. **Compilation flags:** `static` **Mode and number of proofs:** `reset` - `one` ------------------------------------------------------------------------ ###### `mutation/2` Generates by backtracking zero or more mutations for a given term. **Compilation flags:** `static` **Template:** `mutation(Term,Mutation)` **Mode and number of proofs:** `mutation(@callable,@callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `coverage_clause_mutator/0` True when mutation occurrences map directly to predicate clause numbers and can use baseline clause coverage for skipping uncovered mutants. **Compilation flags:** `static` **Mode and number of proofs:** `coverage_clause_mutator` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `predicate_directive_suppression(Entity,Predicate,DirectiveIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting directives. - `DirectiveIndex` - 1-based index for the selected matching directive. - `Occurrence` - 1-based mutation occurrence index to target within selected matching directives. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `predicate_directive_suppression` mutator by suppressing matching predicate or non-terminal directives. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` directive_mutator_protocol **Imports:** `public` mutator_common **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `relational_operator_replacement(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting clauses to mutate. - `ClauseIndex` - 1-based clause index for the selected mutation. - `Occurrence` - 1-based mutation occurrence index to target within selected predicate clauses. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `relational_operator_replacement` mutator for matching predicate clauses. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` clause_mutator_protocol **Imports:** `public` mutator_common **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `scope_directive_replacement(Entity,Predicate,DirectiveIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting directives. - `DirectiveIndex` - 1-based index for the selected matching scope directive. - `Occurrence` - 1-based mutation occurrence index selecting an alternative visibility for the directive. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `scope_directive_replacement` mutator by replacing matching scope directives with an alternative visibility. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` directive_mutator_protocol **Imports:** `public` mutator_common **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `subprocess_coverage_hook` Subprocess coverage hook object. Loaded in baseline coverage subprocesses to capture lgtunit coverage and persist it to a file. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-07 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `load_coverage_config/1` - Protected predicates - Private predicates - `coverage_file_/1` - `coverage_entry_/4` - Operators ##### Public predicates ###### `load_coverage_config/1` Loads a baseline coverage config file and enables coverage collection in the subprocess. **Compilation flags:** `static` **Template:** `load_coverage_config(ConfigFile)` **Mode and number of proofs:** `load_coverage_config(+atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `coverage_file_/1` Holds the baseline coverage output file path for the current subprocess. **Compilation flags:** `dynamic` **Template:** `coverage_file_(CoverageFile)` **Mode and number of proofs:** `coverage_file_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `coverage_entry_/4` Captured lgtunit coverage for one entity predicate: covered clauses and total clauses. **Compilation flags:** `dynamic` **Template:** `coverage_entry_(Entity,Predicate,CoveredClauses,TotalClauses)` **Mode and number of proofs:** `coverage_entry_(?entity_identifier,?predicate_indicator,?list(integer),?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `subprocess_mutation_hook` Subprocess mutation hook object. Loaded in mutation testing subprocesses to set up the mutator hook and record test results to a status file. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_hook/4 **Uses:** fast_random(Algorithm) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `load_config/1` - Protected predicates - Private predicates - `status_file_/1` - `failed_count_/1` - Operators ##### Public predicates ###### `load_config/1` Loads a mutation config file and sets up the mutator hook for the subprocess. **Compilation flags:** `static` **Template:** `load_config(ConfigFile)` **Mode and number of proofs:** `load_config(+atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `status_file_/1` Holds the status file path for the current subprocess. **Compilation flags:** `dynamic` **Template:** `status_file_(StatusFile)` **Mode and number of proofs:** `status_file_(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `failed_count_/1` Accumulates the number of failed tests reported by lgtunit. **Compilation flags:** `dynamic` **Template:** `failed_count_(Failed)` **Mode and number of proofs:** `failed_count_(?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `truth_literal_flip(Entity,Predicate,ClauseIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting clauses to mutate. - `ClauseIndex` - 1-based clause index for the selected mutation (equal to `Occurrence` for this mutator). - `Occurrence` - 1-based mutation occurrence index to target within selected predicate clauses. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `truth_literal_flip` mutator for matching predicate clauses. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` clause_mutator_protocol **Imports:** `public` mutator_common **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `uses_directive_resource_deletion(Entity,Predicate,DirectiveIndex,Occurrence,PrintMutation)` - `Entity` - Identifier of the entity being mutated. - `Predicate` - Predicate or non-terminal indicator selecting resources. - `DirectiveIndex` - 1-based index for the selected matching `uses/2` directive. - `Occurrence` - 1-based mutation occurrence index selecting which matching resource to delete. - `PrintMutation` - Boolean flag to print the original and mutated term plus source location. Hook object implementing the `uses_directive_resource_deletion` mutator by deleting one matching resource from a `uses/2` directive. **Availability:** `logtalk_load(mutation_testing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding `public` directive_mutator_protocol **Imports:** `public` mutator_common **Remarks:** (none) **Inherited public predicates:**  coverage_clause_mutator/0  goal_expansion/2  mutation/2  reset/0  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### mutations") **object** #### `default_atom_mutations` Default atom mutations. **Availability:** `logtalk_load(mutations(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2023-11-24 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** mutations_store::mutation/4 **Uses:** fast_random list type **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also type **object** #### `default_compound_mutations` Default compound mutations. **Availability:** `logtalk_load(mutations(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2023-11-23 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** mutations_store::mutation/4 **Uses:** mutations_store **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also type **object** #### `default_float_mutations` Default float mutations. **Availability:** `logtalk_load(mutations(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2023-11-23 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** mutations_store::mutation/4 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also type **object** #### `default_integer_mutations` Default integer mutations. **Availability:** `logtalk_load(mutations(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2023-11-24 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** mutations_store::mutation/4 **Uses:** fast_random list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also type **object** #### `default_list_mutations` Default list mutations. **Availability:** `logtalk_load(mutations(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2023-11-24 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** mutations_store::mutation/4 **Uses:** fast_random list mutations_store **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also type **category** #### `mutations` Adds mutations support to the library `type` object. **Availability:** `logtalk_load(mutations(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2023-11-23 **Compilation flags:** `static` **Complements:** type **Uses:** mutations_store **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `mutation/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `mutation/3` Returns a random mutation of a term into another term of the same type. The input `Term` is assume to be valid for the given `Type`. **Compilation flags:** `static` **Template:** `mutation(Type,Term,Mutation)` **Mode and number of proofs:** `mutation(@callable,@term,-term)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `mutations_store` Stores mutation definitions for selected types. User extensible by defining objects or categories defining clauses for the `mutation/3` predicate and using this object as a hook object for their compilation. **Availability:** `logtalk_load(mutations(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2023-11-23 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Uses:** fast_random **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - `mutation/3` - `counter/2` - Protected predicates - Private predicates - `mutation/4` - `counter_/2` - Operators ##### Public predicates ###### `mutation/3` Returns a random mutation of a term into another term of the same type. The input `Term` is assumed to be valid for the given `Type`. **Compilation flags:** `static` **Template:** `mutation(Type,Term,Mutation)` **Mode and number of proofs:** `mutation(@callable,@term,-term)` - `one` ------------------------------------------------------------------------ ###### `counter/2` Table of the number of mutations available per type. **Compilation flags:** `static` **Template:** `counter(Type,N)` **Mode and number of proofs:** `counter(?callable,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `mutation/4` Returns a random mutation of a term into another term of the same type using mutator `N`. The input `Term` is assume to be valid for the given `Type`. **Compilation flags:** `static,`` ``multifile` **Template:** `mutation(Type,N,Term,Mutation)` **Mode and number of proofs:** `mutation(?callable,?positive_integer,@term,-term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `counter_/2` Internal counter for the number of mutations available for a given type. **Compilation flags:** `dynamic` **Template:** `counter_(Type,N)` **Mode and number of proofs:** `counter_(?callable,?positive_integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) See also type ### naive_bayes_classifier") **object** #### `naive_bayes_classifier` Naive Bayes classifier with Laplace smoothing and Gaussian distribution support. Learns from a dataset object implementing the `dataset_protocol` protocol and returns a classifier term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(naive_bayes_classifier(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** format list pairs population type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, isolation_forest_anomaly_detector, c45_classifier, knn_classifier, nearest_centroid_classifier, random_forest_classifier, adaptive_boosting_classifier ### nanoid") **object** #### `nanoid` NanoID generator using atom representation, 21 symbols, and the standard URL alphabet. **Availability:** `logtalk_load(nanoid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` nanoid(atom,21,\_-0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also nanoid(Representation,Size,Alphabet), ids, ulid, uuid **object** #### `nanoid(Representation,Size,Alphabet)` - `Representation` - Text representation for the NanoID. Possible values are `atom`, `chars`, and `codes`. - `Size` - Number of symbols in the NanoID. - `Alphabet` - Alphabet used for generating NanoIDs represented as an atom, list of characters, or list of character codes. NanoID generator. **Availability:** `logtalk_load(nanoid(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-01 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` nanoid_protocol **Uses:** crypto list **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also nanoid, ids(Representation,Bytes), ulid(Representation), uuid(Representation) **protocol** #### `nanoid_protocol` NanoID generator protocol. **Availability:** `logtalk_load(nanoid(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2026-02-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `generate/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `generate/1` Returns a NanoID. **Compilation flags:** `static` **Template:** `generate(NanoID)` **Mode and number of proofs:** `generate(--ground)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### nearest_centroid_classifier") **object** #### `nearest_centroid_classifier` Nearest Centroid classifier with multiple distance metrics. Learns from a dataset object implementing the `dataset_protocol` protocol and returns a classifier term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(nearest_centroid_classifier(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** format linear_algebra list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - `predict/4` - `predict_probabilities/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `predict/4` Predicts the class label for a new instance using the learned classifier and the given options. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict(Classifier,Instance,Class,Options)` **Mode and number of proofs:** `predict(+compound,+list,-atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `predict_probabilities/4` Predicts class probabilities for a new instance using the learned classifier and the given options. Returns a list of `Class-Probability` pairs. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict_probabilities(Classifier,Instance,Probabilities,Options)` **Mode and number of proofs:** `predict_probabilities(+compound,+list,-list,+list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, isolation_forest_anomaly_detector, c45_classifier, knn_classifier, naive_bayes_classifier, random_forest_classifier, adaptive_boosting_classifier ### nested_dictionaries") **object** #### `navltree` Nested dictionary implementation based on the AVL tree implementation. Uses standard order to compare keys. **Availability:** `logtalk_load(nested_dictionaries(loader))` **Author:** Paul Brown and Paulo Moura. **Version:** 0:1:0 **Date:** 2021-04-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` nested_dictionary_protocol **Extends:** `private` avltree **Remarks:** (none) **Inherited public predicates:**  as_curly_bracketed/2  as_nested_dictionary/2  delete_in/4  empty/1  insert_in/4  lookup_in/3  new/1  update_in/4  update_in/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also nrbtree, nbintree **object** #### `nbintree` Nested dictionary implementation based on the simple binary tree implementation. Uses standard order to compare keys. **Availability:** `logtalk_load(nested_dictionaries(loader))` **Author:** Paul Brown and Paulo Moura. **Version:** 0:1:0 **Date:** 2021-04-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` nested_dictionary_protocol **Extends:** `private` bintree **Remarks:** (none) **Inherited public predicates:**  as_curly_bracketed/2  as_nested_dictionary/2  delete_in/4  empty/1  insert_in/4  lookup_in/3  new/1  update_in/4  update_in/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also nrbtree, navltree **protocol** #### `nested_dictionary_protocol` Nested dictionary protocol. **Availability:** `logtalk_load(nested_dictionaries(loader))` **Author:** Paul Brown and Paulo Moura **Version:** 0:1:1 **Date:** 2026-06-14 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `new/1` - `empty/1` - `as_nested_dictionary/2` - `as_curly_bracketed/2` - `lookup_in/3` - `update_in/4` - `update_in/5` - `insert_in/4` - `delete_in/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `new/1` Create an empty (nested) dictionary. **Compilation flags:** `static` **Template:** `new(Dictionary)` **Mode and number of proofs:** `new(--dictionary)` - `one` ------------------------------------------------------------------------ ###### `empty/1` True iff the dictionary is empty. **Compilation flags:** `static` **Template:** `empty(Dictionary)` **Mode and number of proofs:** `empty(@dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `as_nested_dictionary/2` Creates a (nested) dictionary term from a curly-brackted term representation. **Compilation flags:** `static` **Template:** `as_nested_dictionary(Term,Dictionary)` **Mode and number of proofs:** `as_nested_dictionary(++term,--dictionary)` - `one_or_error` **Exceptions:** `Term` is a variable: `instantiation_error` `Term` is neither a variable nor a valid curly-bracketed term representation: `type_error(curly_bracketed_term,Term)` `Dictionary` is instantiated: `uninstantiation_error(Dictionary)` ------------------------------------------------------------------------ ###### `as_curly_bracketed/2` Creates a a curly-brackted term representation from a (nested) dictionary. **Compilation flags:** `static` **Template:** `as_curly_bracketed(Dictionary,Term)` **Mode and number of proofs:** `as_curly_bracketed(+dictionary,--term)` - `one_or_error` **Exceptions:** `Dictionary` is a variable or contains a variable leaf value that cannot be represented: `instantiation_error` `Term` is instantiated: `uninstantiation_error(Term)` ------------------------------------------------------------------------ ###### `lookup_in/3` Lookup a chain of keys in a nested dictionary. Unifies `Value` with `Dictionary` when `Keys` is the empty list. **Compilation flags:** `static` **Template:** `lookup_in(Keys,Value,Dictionary)` **Mode and number of proofs:** `lookup_in(++list(ground),?term,+dictionary)` - `zero_or_more` ------------------------------------------------------------------------ ###### `update_in/4` Updates the value found by traversing through the nested keys. **Compilation flags:** `static` **Template:** `update_in(OldDictionary,Keys,Value,NewDictionary)` **Mode and number of proofs:** `update_in(+dictionary,++list(ground),++term,--dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `update_in/5` Updates the value found by traversing through the nested keys, only succeeding if the value found after traversal matches the old value. **Compilation flags:** `static` **Template:** `update_in(OldDictionary,Keys,OldValue,NewValue,NewDictionary)` **Mode and number of proofs:** `update_in(+dictionary,++list(ground),?term,++term,--dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `insert_in/4` Inserts a key-value pair into a dictionary by traversing through the nested keys. When the key already exists, the associated value is updated. **Compilation flags:** `static` **Template:** `insert_in(OldDictionary,Keys,Value,NewDictionary)` **Mode and number of proofs:** `insert_in(+dictionary,++list(ground),++term,--dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ###### `delete_in/4` Deletes a matching key-value pair from a dictionary by traversing through the nested keys, returning the updated dictionary. **Compilation flags:** `static` **Template:** `delete_in(OldDictionary,Keys,Value,NewDictionary)` **Mode and number of proofs:** `delete_in(+dictionary,++list(ground),?term,--dictionary)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also navltree, nbintree, nrbtree **object** #### `nrbtree` Nested dictionary implementation based on the red-black tree implementation. Uses standard order to compare keys. **Availability:** `logtalk_load(nested_dictionaries(loader))` **Author:** Paul Brown and Paulo Moura. **Version:** 0:1:0 **Date:** 2021-04-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` nested_dictionary_protocol **Extends:** `private` rbtree **Remarks:** (none) **Inherited public predicates:**  as_curly_bracketed/2  as_nested_dictionary/2  delete_in/4  empty/1  insert_in/4  lookup_in/3  new/1  update_in/4  update_in/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also navltree, nbintree ### nmea") **object** #### `nmea` Parser for NMEA 0183 sentences with typed semantic decoding for selected GPS/GNSS sentence types. **Availability:** `logtalk_load(nmea(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` nmea_protocol **Imports:** `public` options **Uses:** date list reader time **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  checksum/2  data/2  default_option/1  default_options/1  fields/2  option/2  option/3  parse/2  parse/3  sentence_type/2  talker/2  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `nmea_protocol` Protocol for parsing NMEA 0183 sentences and projecting supported sentence types into typed semantic terms. **Availability:** `logtalk_load(nmea(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-07-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `parse/3` - `talker/2` - `sentence_type/2` - `fields/2` - `checksum/2` - `data/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses NMEA sentences from a source specification into canonical raw sentence terms. Supported source specifications are `atom(Atom)`, `chars(List)`, `codes(List)`, `stream(Stream)`, and `file(Path)`. **Compilation flags:** `static` **Template:** `parse(Source,Sentences)` **Mode and number of proofs:** `parse(++compound,--list(compound))` - `one_or_error` **Exceptions:** `Source` is a variable or contains a variable source argument: `instantiation_error` `Source` is neither a variable nor a valid source specification: `domain_error(nmea_source,Source)` `Source` is a valid source specification but contains a line that cannot be parsed as a sentence: `domain_error(nmea_sentence,Line)` ------------------------------------------------------------------------ ###### `parse/3` Parses NMEA sentences from a source specification using parser options. Supported options are `checksum(required)`, `checksum(optional)`, `checksum(ignore)`, `unknown_type(keep)`, and `unknown_type(error)`. **Compilation flags:** `static` **Template:** `parse(Source,Sentences,Options)` **Mode and number of proofs:** `parse(++compound,--list(compound),++list(compound))` - `one_or_error` **Exceptions:** `Source` is a variable or contains a variable source argument: `instantiation_error` `Source` is neither a variable nor a valid source specification: `domain_error(nmea_source,Source)` `Source` is a valid source specification but contains a line that cannot be parsed as a sentence: `domain_error(nmea_sentence,Line)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` ------------------------------------------------------------------------ ###### `talker/2` Returns the normalized talker identifier for a parsed sentence. Proprietary sentences use the atom `proprietary`. **Compilation flags:** `static` **Template:** `talker(Sentence,Talker)` **Mode and number of proofs:** `talker(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `sentence_type/2` Returns the normalized sentence type identifier for a parsed sentence. **Compilation flags:** `static` **Template:** `sentence_type(Sentence,Type)` **Mode and number of proofs:** `sentence_type(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `fields/2` Returns the lossless ordered list of sentence fields after the sentence identifier. **Compilation flags:** `static` **Template:** `fields(Sentence,Fields)` **Mode and number of proofs:** `fields(+compound,-list(atom))` - `one` ------------------------------------------------------------------------ ###### `checksum/2` Returns the checksum information as `checksum(Provided,Computed)` where `Provided` is either a normalized two-digit hexadecimal atom or `missing`. **Compilation flags:** `static` **Template:** `checksum(Sentence,Checksum)` **Mode and number of proofs:** `checksum(+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `data/2` Projects a parsed sentence into a typed semantic term for the supported sentence types `gga`, `rmc`, `gsa`, `gsv`, `vtg`, and `gll`. **Compilation flags:** `static` **Template:** `data(Sentence,Data)` **Mode and number of proofs:** `data(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### nmf_projection") **object** #### `nmf_projection` Non-negative Matrix Factorization dimension reduction for non-negative continuous datasets. **Availability:** `logtalk_load(nmf_projection(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** format linear_algebra list numberlist type user **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### open_ai") **object** #### `open_ai` Facade predicates for the OpenAI-compatible public non-admin API library. **Availability:** `logtalk_load(open_ai(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** open_ai_catalog open_api **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `document/1` - `operation_count/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `document/1` Returns the generated OpenAPI document for the supported OpenAI-compatible endpoint surface. **Compilation flags:** `static` **Template:** `document(Document)` **Mode and number of proofs:** `document(-compound)` - `one` ------------------------------------------------------------------------ ###### `operation_count/1` Returns the number of supported public non-admin OpenAI operations in the pinned catalog. **Compilation flags:** `static` **Template:** `operation_count(Count)` **Mode and number of proofs:** `operation_count(-integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_ai_api` OpenAPI provider for the public non-admin OpenAI-compatible API surface. **Availability:** `logtalk_load(open_ai(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` open_api_provider_protocol **Uses:** open_ai_catalog **Remarks:** (none) **Inherited public predicates:**  api_info/1  operations/1  schema/2  security/1  security_scheme/2  servers/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `open_ai_backend_protocol` Protocol implemented by OpenAI-compatible server backends. **Availability:** `logtalk_load(open_ai(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `handle_open_ai/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `handle_open_ai/3` Handles an OpenAI operation selected by operation identifier for the normalized HTTP request and returns a REST result term accepted by the `rest` library. The predicate is expected to succeed once for both successful and application error outcomes; plain failure or error is a backend contract violation handled by the server facade as an unexpected server error. **Compilation flags:** `static` **Template:** `handle_open_ai(OperationId,Request,Result)` **Mode and number of proofs:** `handle_open_ai(+atom,+compound,--term)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `open_ai_catalog` Generated catalog for the public non-admin OpenAI API endpoint surface. **Availability:** `logtalk_load(open_ai(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `spec_version/1` - `operation_count/1` - `operation/8` - `operation_properties/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `spec_version/1` Returns the pinned OpenAI OpenAPI document version used to generate the catalog. **Compilation flags:** `static` **Template:** `spec_version(Version)` **Mode and number of proofs:** `spec_version(-atom)` - `one` ------------------------------------------------------------------------ ###### `operation_count/1` Returns the number of public non-admin OpenAI operations in the generated catalog. **Compilation flags:** `static` **Template:** `operation_count(Count)` **Mode and number of proofs:** `operation_count(-integer)` - `one` ------------------------------------------------------------------------ ###### `operation/8` Enumerates generated OpenAI operation descriptors. **Compilation flags:** `static` **Template:** `operation(Id,Tag,Method,Path,Summary,Parameters,RequestBody,Responses)` **Mode and number of proofs:** `operation(?atom,?atom,?atom,?atom,?atom,?list(compound),?compound,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `operation_properties/2` Enumerates additional generated OpenAPI properties for an operation. **Compilation flags:** `static` **Template:** `operation_properties(Id,Properties)` **Mode and number of proofs:** `operation_properties(?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `open_ai_client` OpenAI-compatible client facade using the `http_client` library. **Availability:** `logtalk_load(open_ai(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** http_client list open_ai_catalog **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `request/5` - `operation_url/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `request/5` Calls an OpenAI operation by operation identifier. Path parameters are supplied as `Name-Value` pairs. The body is ignored for methods without a request body. Options include `base_url/1`, `api_key/1`, `organization/1`, `project/1`, and ordinary `http_client` request options. **Compilation flags:** `static` **Template:** `request(OperationId,PathParameters,Body,Response,Options)` **Mode and number of proofs:** `request(+atom,+list(pair),+compound,--compound,+list(compound))` - `one_or_error` **Exceptions:** The catalog operation method `Method` is unsupported by the client facade: `domain_error(open_ai_operation_method,Method)` An element `Parameter` of the list `PathParameters` is not a `Name-Value` pair of atoms: `domain_error(open_ai_path_parameter,Parameter)` `Options` contains an invalid OpenAI client option: `domain_error(open_ai_client_option,Option)` The delegated HTTP client rejects the response stream: `domain_error(http_response_stream,Error)` ------------------------------------------------------------------------ ###### `operation_url/4` Builds the absolute request URL for an operation and path parameters. **Compilation flags:** `static` **Template:** `operation_url(OperationId,PathParameters,URL,Options)` **Mode and number of proofs:** `operation_url(+atom,+list(pair),-atom,+list(compound))` - `one_or_error` **Exceptions:** An element `Parameter` of the list `PathParameters` is not a `Name-Value` pair of atoms: `domain_error(open_ai_path_parameter,Parameter)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_ai_event_stream` Small Server-Sent Events helpers used by OpenAI streaming endpoints. **Availability:** `logtalk_load(open_ai(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `event/2` - `frame/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `event/2` Parses a single OpenAI event-stream frame atom into `event(Name,`` ``Data)`. Unknown fields are ignored. **Compilation flags:** `static` **Template:** `event(Frame,Event)` **Mode and number of proofs:** `event(+atom,-compound)` - `one_or_error` **Exceptions:** `Frame` is not an event-stream frame atom: `domain_error(open_ai_event_stream_frame,Frame)` ------------------------------------------------------------------------ ###### `frame/2` Generates an event-stream frame atom from `event(Name,`` ``Data)`. **Compilation flags:** `static` **Template:** `frame(Event,Frame)` **Mode and number of proofs:** `frame(+compound,-atom)` - `one_or_error` **Exceptions:** `Event` is not an event-stream event term: `domain_error(open_ai_event_stream_event,Event)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `open_ai_server(Backend)` - `Backend` - Application object implementing `open_ai_backend_protocol`. OpenAI-compatible REST server facade backed by an application object. **Availability:** `logtalk_load(open_ai(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` http_handler_protocol `public` open_api_provider_protocol **Imports:** `public` rest **Uses:** http_core list open_ai_api open_ai_catalog **Remarks:** (none) **Inherited public predicates:**  api_info/1  binary_body/2  created_response/4  form_body/2  handle/2  json_array_body/2  json_body/2  json_object_body/2  json_response/4  json_response/5  no_content_response/2  operations/1  path_parameter/3  problem_response/6  query_parameter/3  request_body/2  request_header/3  schema/2  security/1  security_scheme/2  servers/1  text_body/2 - Public predicates - Protected predicates - `open_api_info/1` - `open_api_servers/1` - `open_api_security/1` - `open_api_security_scheme/2` - `open_api_schema/2` - `endpoint/5` - `open_api_validate_request/1` - `open_api_validate_response/1` - `dispatch_open_ai/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `open_api_info/1` Hook returning the OpenAPI information object for the server facade. **Compilation flags:** `static` **Template:** `open_api_info(Info)` **Mode and number of proofs:** `open_api_info(-compound)` - `one` ------------------------------------------------------------------------ ###### `open_api_servers/1` Hook returning the OpenAPI server list for the local server facade. **Compilation flags:** `static` **Template:** `open_api_servers(Servers)` **Mode and number of proofs:** `open_api_servers(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `open_api_security/1` Hook returning the OpenAPI security requirements for the server facade. **Compilation flags:** `static` **Template:** `open_api_security(Security)` **Mode and number of proofs:** `open_api_security(-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `open_api_security_scheme/2` Hook enumerating OpenAPI security schemes for the server facade. **Compilation flags:** `static` **Template:** `open_api_security_scheme(Name,Scheme)` **Mode and number of proofs:** `open_api_security_scheme(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `open_api_schema/2` Hook enumerating named OpenAPI schemas for the server facade. **Compilation flags:** `static` **Template:** `open_api_schema(Name,Schema)` **Mode and number of proofs:** `open_api_schema(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `endpoint/5` Hook enumerating REST endpoint descriptors derived from the generated OpenAI catalog. **Compilation flags:** `static` **Template:** `endpoint(Id,Method,Path,Action,Options)` **Mode and number of proofs:** `endpoint(?atom,?atom,?atom,?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `open_api_validate_request/1` Hook selecting operations whose requests should be validated against the OpenAPI contract. **Compilation flags:** `static` **Template:** `open_api_validate_request(Id)` **Mode and number of proofs:** `open_api_validate_request(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `open_api_validate_response/1` Hook selecting operations whose responses should be validated against the OpenAPI contract. **Compilation flags:** `static` **Template:** `open_api_validate_response(Id)` **Mode and number of proofs:** `open_api_validate_response(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `dispatch_open_ai/2` Dispatches a routed OpenAI request to the backend object and returns a REST result. Backend application errors should be returned as REST result terms; unexpected backend failure or error is left to the `rest` action failure handling. **Compilation flags:** `static` **Template:** `dispatch_open_ai(Request,Result)` **Mode and number of proofs:** `dispatch_open_ai(+compound,--term)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### open_api") **object** #### `open_api` OpenAPI 3.1.0 document derivation, parsing, generation, and validation built on top of the `json` and `json_schema` libraries. **Availability:** `logtalk_load(open_api(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-26 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` http_json_term_helpers **Uses:** http_core json json_schema list url(Representation) user **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `document/2` - `parse/2` - `generate/2` - `validate_document/1` - `validate_document/2` - `operation/3` - `validate_request/3` - `validate_request/4` - `validate_http_request/3` - `validate_http_request/4` - `validate_response/3` - `validate_response/4` - `validate_http_response/3` - `validate_http_response/4` - `json_media_descriptor/2` - `json_media_descriptor/3` - `json_request_body_descriptor/4` - `json_request_body_descriptor/5` - `json_response_descriptor/4` - `json_response_descriptor/5` - `problem_json_schema/1` - `problem_response_descriptor/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `document/2` Derives an OpenAPI 3.1.0 document in the repository-standard JSON term representation from an object implementing the `open_api_provider_protocol` protocol. When the provider also implements the `application_protocol` protocol, missing `description` and `license` info fields may be backfilled from application metadata and `homepage/1` may be mapped to the top-level `externalDocs` object. Top-level security defaults declared by `security/1` are emitted under the root `security` field. Reusable security schemes declared by `security_scheme/2` are emitted under `components.securitySchemes` and referenced scheme names and OAuth flow scopes are validated against those declarations when locally available. **Compilation flags:** `static` **Template:** `document(Provider,Document)` **Mode and number of proofs:** `document(+object_identifier,-compound)` - `one` ------------------------------------------------------------------------ ###### `parse/2` Parses an OpenAPI document from the given source (`file(Path)`, `stream(Stream)`, `codes(List)`, `chars(List)`, or `atom(Atom)`) into the JSON term representation used by the `json` library. **Compilation flags:** `static` **Template:** `parse(Source,Document)` **Mode and number of proofs:** `parse(++compound,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid JSON source term or does not contain parsable JSON by the implementation: `domain_error(json_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(List)`, `chars(List)`, or `atom(Atom)`) for an OpenAPI document term using JSON serialization. **Compilation flags:** `static` **Template:** `generate(Sink,Document)` **Mode and number of proofs:** `generate(+compound,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid JSON sink term: `domain_error(json_sink,Sink)` A JSON version of `Document` cannot be generated by the implementation: `domain_error(json_sink,Document)` ------------------------------------------------------------------------ ###### `validate_document/1` Succeeds if the given OpenAPI document term is valid according to the phase-1 OpenAPI validation schema. **Compilation flags:** `static` **Template:** `validate_document(Document)` **Mode and number of proofs:** `validate_document(+term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate_document/2` Validates an OpenAPI document term and returns a list of validation errors (empty list if valid). **Compilation flags:** `static` **Template:** `validate_document(Document,Errors)` **Mode and number of proofs:** `validate_document(+term,--list)` - `one` ------------------------------------------------------------------------ ###### `operation/3` Resolves an operation descriptor exposed by a provider object using its `operationId` atom. **Compilation flags:** `static` **Template:** `operation(Provider,OperationId,Operation)` **Mode and number of proofs:** `operation(+object_identifier,+atom,-compound)` - `one_or_error` **Exceptions:** `Provider` does not expose the requested `operationId`: `existence_error(open_api_operation,OperationId)` `Provider` exposes duplicated `operationId` values: `domain_error(open_api_operation_id,duplicate(Id))` ------------------------------------------------------------------------ ###### `validate_request/3` Succeeds when the given normalized HTTP request term or object implementing the `http_request_protocol` protocol conforms to the provider operation descriptor identified by the given `operationId`. **Compilation flags:** `static` **Template:** `validate_request(Provider,OperationId,Request)` **Mode and number of proofs:** `validate_request(+object_identifier,+atom,++term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate_request/4` Validates a normalized HTTP request term or an object implementing the `http_request_protocol` protocol against the provider operation descriptor identified by the given `operationId` and returns any contract errors. **Compilation flags:** `static` **Template:** `validate_request(Provider,OperationId,Request,Errors)` **Mode and number of proofs:** `validate_request(+object_identifier,+atom,++term,--list)` - `one` ------------------------------------------------------------------------ ###### `validate_http_request/3` Succeeds when an HTTP request wire source parsed by the `http_core` library conforms to the provider operation descriptor identified by the given `operationId`. **Compilation flags:** `static` **Template:** `validate_http_request(Provider,OperationId,Source)` **Mode and number of proofs:** `validate_http_request(+object_identifier,+atom,++compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate_http_request/4` Parses an HTTP request wire source using the `http_core` library and validates the resulting normalized request against the provider operation descriptor identified by the given `operationId`. **Compilation flags:** `static` **Template:** `validate_http_request(Provider,OperationId,Source,Errors)` **Mode and number of proofs:** `validate_http_request(+object_identifier,+atom,++compound,--list)` - `one` ------------------------------------------------------------------------ ###### `validate_response/3` Succeeds when the given normalized HTTP response term or object implementing the `http_response_protocol` protocol conforms to the provider operation descriptor identified by the given `operationId`. **Compilation flags:** `static` **Template:** `validate_response(Provider,OperationId,Response)` **Mode and number of proofs:** `validate_response(+object_identifier,+atom,++term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate_response/4` Validates a normalized HTTP response term or an object implementing the `http_response_protocol` protocol against the provider operation descriptor identified by the given `operationId` and returns any contract errors. **Compilation flags:** `static` **Template:** `validate_response(Provider,OperationId,Response,Errors)` **Mode and number of proofs:** `validate_response(+object_identifier,+atom,++term,--list)` - `one` ------------------------------------------------------------------------ ###### `validate_http_response/3` Succeeds when an HTTP response wire source parsed by the `http_core` library conforms to the provider operation descriptor identified by the given `operationId`. **Compilation flags:** `static` **Template:** `validate_http_response(Provider,OperationId,Source)` **Mode and number of proofs:** `validate_http_response(+object_identifier,+atom,++compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate_http_response/4` Parses an HTTP response wire source using the `http_core` library and validates the resulting normalized response against the provider operation descriptor identified by the given `operationId`. **Compilation flags:** `static` **Template:** `validate_http_response(Provider,OperationId,Source,Errors)` **Mode and number of proofs:** `validate_http_response(+object_identifier,+atom,++compound,--list)` - `one` ------------------------------------------------------------------------ ###### `json_media_descriptor/2` Constructs an OpenAPI JSON media descriptor using the default `application/json` media type. **Compilation flags:** `static` **Template:** `json_media_descriptor(Schema,MediaDescriptor)` **Mode and number of proofs:** `json_media_descriptor(++term,-compound)` - `one_or_error` **Exceptions:** `Schema` is a variable: `instantiation_error` `Schema` is neither a boolean schema nor a JSON object schema term nor a `schema_ref/1` term: `domain_error(open_api_json_schema_term,Schema)` ------------------------------------------------------------------------ ###### `json_media_descriptor/3` Constructs an OpenAPI JSON media descriptor using the given media type. **Compilation flags:** `static` **Template:** `json_media_descriptor(MediaType,Schema,MediaDescriptor)` **Mode and number of proofs:** `json_media_descriptor(+atom,++term,-compound)` - `one_or_error` **Exceptions:** `MediaType` is a variable: `instantiation_error` `MediaType` is neither a variable nor a JSON-compatible HTTP media type atom: `domain_error(open_api_media_type,MediaType)` `Schema` is a variable: `instantiation_error` `Schema` is neither a boolean schema nor a JSON object schema term nor a `schema_ref/1` term: `domain_error(open_api_json_schema_term,Schema)` ------------------------------------------------------------------------ ###### `json_request_body_descriptor/4` Constructs an OpenAPI request-body descriptor using the default `application/json` media type. **Compilation flags:** `static` **Template:** `json_request_body_descriptor(Description,Required,Schema,RequestBody)` **Mode and number of proofs:** `json_request_body_descriptor(+atom,+boolean,++term,-compound)` - `one_or_error` **Exceptions:** `Description` is a variable: `instantiation_error` `Description` is neither a variable nor an atom: `domain_error(open_api_description,Description)` `Required` is a variable: `instantiation_error` `Required` is neither a variable nor a boolean: `domain_error(open_api_boolean,Required)` `Schema` is a variable: `instantiation_error` `Schema` is neither a boolean schema nor a JSON object schema term nor a `schema_ref/1` term: `domain_error(open_api_json_schema_term,Schema)` ------------------------------------------------------------------------ ###### `json_request_body_descriptor/5` Constructs an OpenAPI request-body descriptor using the given media type. **Compilation flags:** `static` **Template:** `json_request_body_descriptor(MediaType,Description,Required,Schema,RequestBody)` **Mode and number of proofs:** `json_request_body_descriptor(+atom,+atom,+boolean,++term,-compound)` - `one_or_error` **Exceptions:** `MediaType` is a variable: `instantiation_error` `MediaType` is neither a variable nor a JSON-compatible HTTP media type atom: `domain_error(open_api_media_type,MediaType)` `Description` is a variable: `instantiation_error` `Description` is neither a variable nor an atom: `domain_error(open_api_description,Description)` `Required` is a variable: `instantiation_error` `Required` is neither a variable nor a boolean: `domain_error(open_api_boolean,Required)` `Schema` is a variable: `instantiation_error` `Schema` is neither a boolean schema nor a JSON object schema term nor a `schema_ref/1` term: `domain_error(open_api_json_schema_term,Schema)` ------------------------------------------------------------------------ ###### `json_response_descriptor/4` Constructs an OpenAPI response descriptor using the default `application/json` media type. **Compilation flags:** `static` **Template:** `json_response_descriptor(Status,Description,Schema,ResponseDescriptor)` **Mode and number of proofs:** `json_response_descriptor(++term,+atom,++term,-compound)` - `one_or_error` **Exceptions:** `Status` is a variable: `instantiation_error` `Status` is neither a variable nor `default` nor an integer in the `100..599` range nor a wildcard status atom such as `'2XX'`: `domain_error(open_api_response_status,Status)` `Description` is a variable: `instantiation_error` `Description` is neither a variable nor an atom: `domain_error(open_api_description,Description)` `Schema` is a variable: `instantiation_error` `Schema` is neither a boolean schema nor a JSON object schema term nor a `schema_ref/1` term: `domain_error(open_api_json_schema_term,Schema)` ------------------------------------------------------------------------ ###### `json_response_descriptor/5` Constructs an OpenAPI response descriptor using the given media type. **Compilation flags:** `static` **Template:** `json_response_descriptor(Status,Description,MediaType,Schema,ResponseDescriptor)` **Mode and number of proofs:** `json_response_descriptor(++term,+atom,+atom,++term,-compound)` - `one_or_error` **Exceptions:** `Status` is a variable: `instantiation_error` `Status` is neither a variable nor `default` nor an integer in the `100..599` range nor a wildcard status atom such as `'2XX'`: `domain_error(open_api_response_status,Status)` `Description` is a variable: `instantiation_error` `Description` is neither a variable nor an atom: `domain_error(open_api_description,Description)` `MediaType` is a variable: `instantiation_error` `MediaType` is neither a variable nor a JSON-compatible HTTP media type atom: `domain_error(open_api_media_type,MediaType)` `Schema` is a variable: `instantiation_error` `Schema` is neither a boolean schema nor a JSON object schema term nor a `schema_ref/1` term: `domain_error(open_api_json_schema_term,Schema)` ------------------------------------------------------------------------ ###### `problem_json_schema/1` Returns an inline RFC 7807-compatible JSON schema for problem responses. **Compilation flags:** `static` **Template:** `problem_json_schema(Schema)` **Mode and number of proofs:** `problem_json_schema(-term)` - `one` ------------------------------------------------------------------------ ###### `problem_response_descriptor/3` Constructs an OpenAPI problem-response descriptor using the `application/problem+json` media type and the default problem schema. **Compilation flags:** `static` **Template:** `problem_response_descriptor(Status,Description,ResponseDescriptor)` **Mode and number of proofs:** `problem_response_descriptor(++term,+atom,-compound)` - `one_or_error` **Exceptions:** `Status` is a variable: `instantiation_error` `Status` is neither a variable nor `default` nor an integer in the `100..599` range nor a wildcard status atom such as `'2XX'`: `domain_error(open_api_response_status,Status)` `Description` is a variable: `instantiation_error` `Description` is neither a variable nor an atom: `domain_error(open_api_description,Description)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also json, json_schema, application_protocol, open_api_provider_protocol **protocol** #### `open_api_provider_protocol` Protocol for Logtalk objects that provide metadata used to derive OpenAPI 3.1.0 documents. **Availability:** `logtalk_load(open_api(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `api_info/1` - `servers/1` - `security/1` - `operations/1` - `schema/2` - `security_scheme/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `api_info/1` Returns the API metadata descriptor. The descriptor must be the compound term `info(Title,`` ``Version,`` ``Summary,`` ``Properties)` where `Title`, `Version`, and `Summary` are atoms and `Properties` is a list of optional metadata terms. Currently recognized properties: `description(Description)` where `Description` is an atom. **Compilation flags:** `static` **Template:** `api_info(Info)` **Mode and number of proofs:** `api_info(-compound)` - `one` ------------------------------------------------------------------------ ###### `servers/1` Returns a list of server descriptors available for this API. Each descriptor must be a compound term `server(URL,`` ``Description)` where `URL` is a valid OpenAPI Server Object URL atom, allowing absolute URLs, relative references, and templated variables, and `Description` is a human-readable atom. **Compilation flags:** `static` **Template:** `servers(Servers)` **Mode and number of proofs:** `servers(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `security/1` Returns the top-level OpenAPI security requirement alternatives for this API. The returned list uses the same representation as operation `security(Requirements)` properties: each element is a requirement alternative represented as a list of `Scheme-Scopes` pairs and `[]` denotes an empty security requirement object. Scheme names must be declared by `security_scheme/2`. **Compilation flags:** `static` **Template:** `security(Security)` **Mode and number of proofs:** `security(-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `operations/1` Returns a list of operation descriptors exposed by this API. Each descriptor must be a compound term `operation(Id,`` ``Method,`` ``Path,`` ``Summary,`` ``Parameters,`` ``RequestBody,`` ``Responses,`` ``Properties)` where `Id` is an atom and unique across the returned descriptors, `Method` is a lowercase HTTP method atom, `Path` is a path-template atom, `Summary` is an atom, `Parameters` is a list of `parameter(Name,`` ``In,`` ``Description,`` ``Required,`` ``Schema)` terms, `RequestBody` is either `none` or `request_body(Description,`` ``Required,`` ``MediaTypes)`, `Responses` is a list of `response(Status,`` ``Description,`` ``MediaTypes)` terms, and `Properties` is a list of optional operation property terms. `Status` may be an integer HTTP status code, `default`, or a wildcard range atom such as `'2XX'`. Path parameters must use `In`` ``=`` ``path`, match a template expression in `Path`, and use `Required`` ``=`` ``true`. Currently recognized property terms are `description(Description)`, `tags(Tags)`, `deprecated(Boolean)`, and `security(Requirements)` where `Requirements` is a list whose elements are requirement alternatives represented as lists of `Scheme-Scopes` pairs; the empty list element `[]` denotes an empty security requirement object, scheme names must be declared by `security_scheme/2`, and referenced OAuth flow scopes must be declared by the corresponding security scheme when locally available. **Compilation flags:** `static` **Template:** `operations(Operations)` **Mode and number of proofs:** `operations(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `schema/2` Maps reusable schema names to JSON Schema terms. `Name` must be an atom and `Schema` must be a JSON Schema curly term compatible with the `json_schema` library. This predicate is intended both for lookup by name and for enumeration of all reusable schemas referenced from `schema_ref(Name)` terms. **Compilation flags:** `static` **Template:** `schema(Name,Schema)` **Mode and number of proofs:** `schema(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `security_scheme/2` Maps reusable security scheme names to security descriptor terms. `Name` must be an atom matching scheme names referenced from operation `security(Requirements)` properties and `Scheme` must use one of the supported descriptor shapes: `api_key/2-3`, `http/1-2`, `mutual_tls/0-1`, `oauth2/1-2`, or `openid_connect/1-2`. OAuth flow descriptors are expressed using `implicit/2-3`, `password/2-3`, `client_credentials/2-3`, and `authorization_code/3-4` with `scope/2` terms. `openid_connect/2` also accepts a provider-only `flows(Flows)` option for local scope declarations used during security-reference validation; those local flow declarations are not emitted into the derived OpenAPI document. Provider-side validation checks required fields, valid `apiKey` locations, and URL-valued fields in OAuth or OpenID Connect descriptors. **Compilation flags:** `static` **Template:** `security_scheme(Name,Scheme)` **Mode and number of proofs:** `security_scheme(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### open_id") **object** #### `open_id` Facade predicates for a portable OpenID Connect Authorization Code + PKCE client. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-12 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** open_id_client open_id_jwks_cache open_id_jwt open_id_logout open_id_pkce open_id_response **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `discover/3` - `authorization_url/5` - `authorization_response/3` - `authorization_code/4` - `exchange_code/5` - `refresh_token/4` - `userinfo/4` - `logout_url/4` - `jwks/3` - `cached_jwks/3` - `verify_id_token/4` - `verify_id_token/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `discover/3` Discovers and validates OpenID Provider metadata for the given issuer. **Compilation flags:** `static` **Template:** `discover(Issuer,Provider,Options)` **Mode and number of proofs:** `discover(+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Issuer` is a variable: `instantiation_error` `Issuer` is not an absolute or allowed issuer URL: `domain_error(open_id_issuer,Issuer)` The discovery endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The discovery endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` The discovered issuer does not match `Issuer`: `domain_error(open_id_issuer,DiscoveredIssuer)` A provider metadata URL is not secure: `domain_error(open_id_provider_metadata_url,URL)` ------------------------------------------------------------------------ ###### `authorization_url/5` Builds an authorization URL and returns the session data needed for the code exchange and ID-token validation. **Compilation flags:** `static` **Template:** `authorization_url(Provider,Request,URL,Session,Options)` **Mode and number of proofs:** `authorization_url(+compound,+compound,-atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is neither a direct options list nor a request wrapper term containing an options list: `domain_error(open_id_options,Request)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Request` is missing a required authorization request option: `domain_error(open_id_authorization_request,missing(Name))` A request value that must be an atom is not an atom: `type_error(atom,Value)` A scope value is neither an atom nor a list of atoms: `domain_error(open_id_space_separated_atom,Value)` The PKCE code verifier is a variable: `instantiation_error` The PKCE code verifier is not valid: `domain_error(open_id_code_verifier,Verifier)` ------------------------------------------------------------------------ ###### `authorization_response/3` Parses an authorization callback URL into either an authorization response or an authorization error term. **Compilation flags:** `static` **Template:** `authorization_response(CallbackURL,Response,Options)` **Mode and number of proofs:** `authorization_response(+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `CallbackURL` is not a valid callback URL or relative reference: `domain_error(open_id_authorization_response,CallbackURL)` ------------------------------------------------------------------------ ###### `authorization_code/4` Parses an authorization callback URL, validates the session state, and returns the authorization code. **Compilation flags:** `static` **Template:** `authorization_code(CallbackURL,Session,Code,Options)` **Mode and number of proofs:** `authorization_code(+atom,+compound,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Session` is missing required state data: `domain_error(open_id_session,missing(Session,state))` The callback response is an authorization error: `domain_error(open_id_authorization_response,authorization_error(Response))` The callback response state does not match the session state: `domain_error(open_id_authorization_response,state_mismatch(Expected,Actual))` ------------------------------------------------------------------------ ###### `exchange_code/5` Exchanges an authorization code for token response data. **Compilation flags:** `static` **Template:** `exchange_code(Provider,Code,Session,Tokens,Options)` **Mode and number of proofs:** `exchange_code(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Session` is missing required authorization-code exchange data: `domain_error(open_id_session,missing(Session,Name))` The token endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The token endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` The token endpoint JSON response is missing a required member: `domain_error(open_id_token_response,missing(Name))` ------------------------------------------------------------------------ ###### `refresh_token/4` Exchanges a refresh token for token response data. **Compilation flags:** `static` **Template:** `refresh_token(Provider,RefreshToken,Tokens,Options)` **Mode and number of proofs:** `refresh_token(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The `client_id` option is missing: `domain_error(open_id_refresh_token,missing(client_id))` The token endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The token endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` The token endpoint JSON response is missing a required member: `domain_error(open_id_token_response,missing(Name))` ------------------------------------------------------------------------ ###### `userinfo/4` Fetches UserInfo claims using the given access token. **Compilation flags:** `static` **Template:** `userinfo(Provider,AccessToken,Claims,Options)` **Mode and number of proofs:** `userinfo(+compound,+atom,-term,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The provider metadata is missing a UserInfo endpoint: `domain_error(open_id_provider,missing(userinfo_endpoint))` The UserInfo endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The UserInfo endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` ------------------------------------------------------------------------ ###### `logout_url/4` Builds a logout URL for an RP-initiated logout request. **Compilation flags:** `static` **Template:** `logout_url(Provider,Request,URL,Options)` **Mode and number of proofs:** `logout_url(+compound,+compound,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Request` is neither a direct options list nor a request wrapper term containing an options list: `domain_error(open_id_options,Request)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The provider metadata is missing an end-session endpoint: `domain_error(open_id_provider,missing(end_session_endpoint))` A request value that must be an atom is not an atom: `type_error(atom,Value)` A `ui_locales` value is neither an atom nor a list of atoms: `domain_error(open_id_space_separated_atom,Value)` The `post_logout_redirect_uri` is not secure: `domain_error(open_id_post_logout_redirect_uri,URL)` ------------------------------------------------------------------------ ###### `jwks/3` Fetches the JSON Web Key Set for the provider. **Compilation flags:** `static` **Template:** `jwks(Provider,JWKSet,Options)` **Mode and number of proofs:** `jwks(+compound,-term,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The JWKS endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The JWKS endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` ------------------------------------------------------------------------ ###### `cached_jwks/3` Returns a cached JWKS for a provider, refreshing it when needed. **Compilation flags:** `static` **Template:** `cached_jwks(Provider,JWKSet,Options)` **Mode and number of proofs:** `cached_jwks(+compound,-term,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The provider metadata is missing a JWKS endpoint: `domain_error(open_id_provider,missing(jwks_uri))` The JWKS endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The JWKS endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` ------------------------------------------------------------------------ ###### `verify_id_token/4` Verifies an ID-token using cached JWKS data, refreshing the JWKS once when the token key identifier is unknown. **Compilation flags:** `static` **Template:** `verify_id_token(Token,Provider,Claims,Options)` **Mode and number of proofs:** `verify_id_token(+atom,+compound,-term,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The provider metadata is missing a JWKS endpoint: `domain_error(open_id_provider,missing(jwks_uri))` The JWKS endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The JWKS endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` The JWT header does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(open_id_jwt_algorithm,Algorithm)` `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,JWKSet)` No compatible key exists for the JWT header: `existence_error(jwt_jwk,Header)` The selected JWK is not a supported public key: `domain_error(jwt_jwk_public_key,Key)` The ES256 signature is not 64 bytes long: `domain_error(jwt_es256_signature,Signature)` The OpenSSL executable does not exist: `existence_error(os_command,Executable)` The `iss` claim does not match the provider issuer: `domain_error(open_id_claim(iss),Value)` A required OpenID ID-token claim is missing: `domain_error(open_id_claims,missing(Name))` The expected audience option is missing: `domain_error(open_id_claims,missing(expected_audience))` An OpenID ID-token claim has an invalid value: `domain_error(open_id_claim(Name),Value)` An OpenID ID-token time claim value is not a number: `type_error(time_number,Name-Time)` ------------------------------------------------------------------------ ###### `verify_id_token/5` Verifies an ID-token signature and claims using the given provider metadata and JWKS. **Compilation flags:** `static` **Template:** `verify_id_token(Token,Provider,JWKSet,Claims,Options)` **Mode and number of proofs:** `verify_id_token(+atom,+compound,+term,-term,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` The JWT header does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(open_id_jwt_algorithm,Algorithm)` `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,JWKSet)` No compatible key exists for the JWT header: `existence_error(jwt_jwk,Header)` The selected JWK is not a supported public key: `domain_error(jwt_jwk_public_key,Key)` The ES256 signature is not 64 bytes long: `domain_error(jwt_es256_signature,Signature)` The OpenSSL executable does not exist: `existence_error(os_command,Executable)` The `iss` claim does not match the provider issuer: `domain_error(open_id_claim(iss),Value)` A required OpenID ID-token claim is missing: `domain_error(open_id_claims,missing(Name))` The expected audience option is missing: `domain_error(open_id_claims,missing(expected_audience))` An OpenID ID-token claim has an invalid value: `domain_error(open_id_claim(Name),Value)` An OpenID ID-token time claim value is not a number: `type_error(time_number,Name-Time)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_client` HTTP-facing OpenID Connect client predicates. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** base64 http_client http_core list open_id_discovery user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `discover/3` - `jwks/3` - `exchange_code/5` - `refresh_token/4` - `userinfo/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `discover/3` Discovers and validates OpenID Provider metadata for the given issuer. **Compilation flags:** `static` **Template:** `discover(Issuer,Provider,Options)` **Mode and number of proofs:** `discover(+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Issuer` is a variable: `instantiation_error` `Issuer` is not an absolute or allowed issuer URL: `domain_error(open_id_issuer,Issuer)` The discovery endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The discovery endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` The discovered issuer does not match `Issuer`: `domain_error(open_id_issuer,DiscoveredIssuer)` A provider metadata URL is not secure: `domain_error(open_id_provider_metadata_url,URL)` ------------------------------------------------------------------------ ###### `jwks/3` Fetches the JSON Web Key Set for the given provider metadata. **Compilation flags:** `static` **Template:** `jwks(Provider,JWKSet,Options)` **Mode and number of proofs:** `jwks(+compound,-term,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The JWKS endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The JWKS endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` ------------------------------------------------------------------------ ###### `exchange_code/5` Exchanges an authorization code for token response data. **Compilation flags:** `static` **Template:** `exchange_code(Provider,Code,Session,Tokens,Options)` **Mode and number of proofs:** `exchange_code(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Session` is missing required authorization-code exchange data: `domain_error(open_id_session,missing(Session,Name))` The token endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The token endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` The token endpoint JSON response is missing a required member: `domain_error(open_id_token_response,missing(Name))` ------------------------------------------------------------------------ ###### `refresh_token/4` Exchanges a refresh token for token response data. **Compilation flags:** `static` **Template:** `refresh_token(Provider,RefreshToken,Tokens,Options)` **Mode and number of proofs:** `refresh_token(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The `client_id` option is missing: `domain_error(open_id_refresh_token,missing(client_id))` The token endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The token endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` The token endpoint JSON response is missing a required member: `domain_error(open_id_token_response,missing(Name))` ------------------------------------------------------------------------ ###### `userinfo/4` Fetches UserInfo claims using the given access token. **Compilation flags:** `static` **Template:** `userinfo(Provider,AccessToken,Claims,Options)` **Mode and number of proofs:** `userinfo(+compound,+atom,-term,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The provider metadata is missing a UserInfo endpoint: `domain_error(open_id_provider,missing(userinfo_endpoint))` The UserInfo endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The UserInfo endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_der` DER and PEM helpers for OpenID Connect JWT signature verification. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** base64 list user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `public_key_pem/2` - `es256_signature_der/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `public_key_pem/2` Converts a supported JWK public key into PEM SubjectPublicKeyInfo text. **Compilation flags:** `static` **Template:** `public_key_pem(Key,PEM)` **Mode and number of proofs:** `public_key_pem(+term,-atom)` - `one_or_error` **Exceptions:** `Key` is not a supported RSA or P-256 EC public JWK: `domain_error(open_id_jwk_public_key,Key)` `Key` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `es256_signature_der/2` Converts a raw ES256 signature into DER-encoded ASN.1 form. **Compilation flags:** `static` **Template:** `es256_signature_der(Signature,DER)` **Mode and number of proofs:** `es256_signature_der(+list(byte),-list(byte))` - `one_or_error` **Exceptions:** `Signature` is not a 64-byte raw ES256 signature: `domain_error(open_id_es256_signature,Signature)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_discovery` OpenID Provider discovery metadata helpers. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `discovery_url/2` - `provider/3` - `provider/4` - `property/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `discovery_url/2` Builds the discovery metadata URL for an issuer. **Compilation flags:** `static` **Template:** `discovery_url(Issuer,URL)` **Mode and number of proofs:** `discovery_url(+atom,-atom)` - `one_or_error` **Exceptions:** `Issuer` is a variable: `instantiation_error` `Issuer` is not an absolute issuer URL: `domain_error(open_id_issuer,Issuer)` ------------------------------------------------------------------------ ###### `provider/3` Builds validated provider metadata from discovery JSON using default options. **Compilation flags:** `static` **Template:** `provider(ExpectedIssuer,JSON,Provider)` **Mode and number of proofs:** `provider(+atom,+term,-compound)` - `one_or_error` **Exceptions:** The discovered issuer does not match `ExpectedIssuer`: `domain_error(open_id_issuer,Issuer)` A provider metadata URL is not secure: `domain_error(open_id_provider_metadata_url,URL)` ------------------------------------------------------------------------ ###### `provider/4` Builds validated provider metadata from discovery JSON using the given options. **Compilation flags:** `static` **Template:** `provider(ExpectedIssuer,JSON,Provider,Options)` **Mode and number of proofs:** `provider(+atom,+term,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The discovered issuer does not match `ExpectedIssuer`: `domain_error(open_id_issuer,Issuer)` A provider metadata URL is not secure: `domain_error(open_id_provider_metadata_url,URL)` ------------------------------------------------------------------------ ###### `property/3` Looks up a property in validated provider metadata. **Compilation flags:** `static` **Template:** `property(Provider,Name,Value)` **Mode and number of proofs:** `property(+compound,+atom,-term)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `open_id_helpers` Internal shared helpers for the open_id library. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static` **Extends:** `public` options **Uses:** base64url_no_padding http_core list url(Representation) user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - Protected predicates - `json_member/3` - `json_member_default/4` - `provider_property/3` - `provider_property_default/4` - `normalize_options_term/2` - `query_atom/2` - `space_atom/2` - `url_scheme/2` - `https_url/1` - `localhost_http_url/1` - `ensure_absolute_url/2` - `ensure_secure_url/3` - `atom_bytes/2` - `bytes_atom/2` - `base64url_atom_bytes/2` - `json_object_pairs/2` - `pair_key_value/3` - `append_query/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `json_member/3` Enumerates JSON object member values for a given key. **Compilation flags:** `static` **Template:** `json_member(Key,Object,Value)` **Mode and number of proofs:** `json_member(+atom,+term,-term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `json_member_default/4` Returns a JSON object member value or a default when the key is absent. **Compilation flags:** `static` **Template:** `json_member_default(Key,Object,Default,Value)` **Mode and number of proofs:** `json_member_default(+atom,+term,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `provider_property/3` Looks up a property in a provider metadata compound term. **Compilation flags:** `static` **Template:** `provider_property(Provider,Name,Value)` **Mode and number of proofs:** `provider_property(+compound,+atom,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `provider_property_default/4` Returns a provider metadata property or a default when the property is absent. **Compilation flags:** `static` **Template:** `provider_property_default(Provider,Name,Default,Value)` **Mode and number of proofs:** `provider_property_default(+compound,+atom,+term,-term)` - `one` ------------------------------------------------------------------------ ###### `normalize_options_term/2` Normalizes either a direct options list or a named options wrapper term. **Compilation flags:** `static` **Template:** `normalize_options_term(NameOptions,Options)` **Mode and number of proofs:** `normalize_options_term(+term,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `query_atom/2` Encodes query parameters as a URL query atom. **Compilation flags:** `static` **Template:** `query_atom(Pairs,Query)` **Mode and number of proofs:** `query_atom(+list(pair),-atom)` - `one_or_error` **Exceptions:** The HTTP body sink is a variable: `instantiation_error` The HTTP body sink is not a valid sink term: `domain_error(http_sink,Sink)` `Pairs` cannot be represented as an HTTP form body: `domain_error(http_body,Body)` The HTTP body options are invalid: `domain_error(http_body_options,Options)` ------------------------------------------------------------------------ ###### `space_atom/2` Converts an atom or list of atoms into a space-separated atom. **Compilation flags:** `static` **Template:** `space_atom(Value,Atom)` **Mode and number of proofs:** `space_atom(+term,-atom)` - `one_or_error` **Exceptions:** `Value` is neither an atom nor a list of atoms: `domain_error(open_id_space_separated_atom,Value)` ------------------------------------------------------------------------ ###### `url_scheme/2` Extracts the scheme from an absolute URL atom. **Compilation flags:** `static` **Template:** `url_scheme(URL,Scheme)` **Mode and number of proofs:** `url_scheme(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `https_url/1` Succeeds when the URL uses the https scheme. **Compilation flags:** `static` **Template:** `https_url(URL)` **Mode and number of proofs:** `https_url(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `localhost_http_url/1` Succeeds when the URL uses http for a localhost or loopback host. **Compilation flags:** `static` **Template:** `localhost_http_url(URL)` **Mode and number of proofs:** `localhost_http_url(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `ensure_absolute_url/2` Validates that a value is an absolute URL for the given domain label. **Compilation flags:** `static` **Template:** `ensure_absolute_url(Domain,URL)` **Mode and number of proofs:** `ensure_absolute_url(+atom,+atom)` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not an absolute URL atom: `domain_error(Domain,URL)` ------------------------------------------------------------------------ ###### `ensure_secure_url/3` Validates that a URL uses https or an allowed localhost exception. **Compilation flags:** `static` **Template:** `ensure_secure_url(Domain,URL,Options)` **Mode and number of proofs:** `ensure_secure_url(+atom,+atom,+list(compound))` - `one_or_error` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is not an absolute URL atom: `domain_error(Domain,URL)` `URL` is not secure and is not an allowed localhost HTTP URL: `domain_error(Domain,URL)` ------------------------------------------------------------------------ ###### `atom_bytes/2` Converts between an atom and its byte list representation. **Compilation flags:** `static` **Template:** `atom_bytes(Atom,Bytes)` **Mode and number of proofs:** `atom_bytes(+atom,-list(byte))` - `one` `atom_bytes(-atom,+list(byte))` - `one` ------------------------------------------------------------------------ ###### `bytes_atom/2` Converts a byte list into an atom. **Compilation flags:** `static` **Template:** `bytes_atom(Bytes,Atom)` **Mode and number of proofs:** `bytes_atom(+list(byte),-atom)` - `one` ------------------------------------------------------------------------ ###### `base64url_atom_bytes/2` Converts between unpadded Base64URL atoms and byte lists. **Compilation flags:** `static` **Template:** `base64url_atom_bytes(Atom,Bytes)` **Mode and number of proofs:** `base64url_atom_bytes(+atom,-list(byte))` - `one_or_error` `base64url_atom_bytes(-atom,+list(byte))` - `one_or_error` **Exceptions:** `Atom` is a variable or the sink is a variable: `instantiation_error` `Atom` is neither a variable nor a valid Base64URL source term: `domain_error(base64url_source,codes(Codes))` `Bytes` cannot be encoded in the requested Base64URL sink representation: `domain_error(base64url_sink,codes(Codes))` `Atom` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `json_object_pairs/2` Extracts the key-value pairs from a JSON object term. **Compilation flags:** `static` **Template:** `json_object_pairs(Object,Pairs)` **Mode and number of proofs:** `json_object_pairs(+term,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `pair_key_value/3` Extracts the key and value from a JSON pair compound term. **Compilation flags:** `static` **Template:** `pair_key_value(Pair,Key,Value)` **Mode and number of proofs:** `pair_key_value(+compound,-term,-term)` - `one` ------------------------------------------------------------------------ ###### `append_query/3` Appends a query atom to an endpoint URL, preserving any existing query. **Compilation flags:** `static` **Template:** `append_query(Endpoint,Query,URL)` **Mode and number of proofs:** `append_query(+atom,+atom,-atom)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_jwks` JSON Web Key Set parsing and key selection helpers. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `select_key/3` - `header_algorithm/2` - `header_key_id/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `select_key/3` Selects a matching verification key from a JWK Set for a JWT header. **Compilation flags:** `static` **Template:** `select_key(JWKSet,Header,Key)` **Mode and number of proofs:** `select_key(+term,+term,-term)` - `one_or_error` **Exceptions:** `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(open_id_jwks,JWKSet)` `Header` does not contain a valid `alg` member: `domain_error(open_id_jwt_header,Header)` No compatible key exists for `Header`: `existence_error(open_id_jwk,Header)` ------------------------------------------------------------------------ ###### `header_algorithm/2` Extracts and validates the JWT header algorithm. **Compilation flags:** `static` **Template:** `header_algorithm(Header,Algorithm)` **Mode and number of proofs:** `header_algorithm(+term,-atom)` - `one_or_error` **Exceptions:** `Header` does not contain a valid `alg` member: `domain_error(open_id_jwt_header,Header)` ------------------------------------------------------------------------ ###### `header_key_id/2` Extracts the optional key identifier from a JWT header. **Compilation flags:** `static` **Template:** `header_key_id(Header,KeyId)` **Mode and number of proofs:** `header_key_id(+term,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_jwks_cache` JWKS caching and key-rotation helpers. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-12 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** open_id_client open_id_jwt os **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `cached_jwks/3` - `verify_id_token/4` - `clear/0` - `clear/1` - Protected predicates - Private predicates - `cached_jwks_/3` - Operators ##### Public predicates ###### `cached_jwks/3` Returns a cached JWKS for a provider, refreshing it when the cache is stale or missing. **Compilation flags:** `static` **Template:** `cached_jwks(Provider,JWKSet,Options)` **Mode and number of proofs:** `cached_jwks(+compound,-term,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The provider metadata is missing a JWKS endpoint: `domain_error(open_id_provider,missing(jwks_uri))` The JWKS endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The JWKS endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` ------------------------------------------------------------------------ ###### `verify_id_token/4` Verifies an ID-token using cached JWKS data, refreshing the cache once when the token key identifier is unknown. **Compilation flags:** `static` **Template:** `verify_id_token(Token,Provider,Claims,Options)` **Mode and number of proofs:** `verify_id_token(+atom,+compound,-term,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The provider metadata is missing a JWKS endpoint: `domain_error(open_id_provider,missing(jwks_uri))` The JWKS endpoint returned a non-success status: `domain_error(open_id_http_status,Code)` The JWKS endpoint response body is not JSON: `domain_error(open_id_json_response,Body)` `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` The JWT header does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(open_id_jwt_algorithm,Algorithm)` `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,JWKSet)` No compatible key exists for the JWT header: `existence_error(jwt_jwk,Header)` The selected JWK is not a supported public key: `domain_error(jwt_jwk_public_key,Key)` The ES256 signature is not 64 bytes long: `domain_error(jwt_es256_signature,Signature)` The OpenSSL executable does not exist: `existence_error(os_command,Executable)` The `iss` claim does not match the provider issuer: `domain_error(open_id_claim(iss),Value)` A required OpenID ID-token claim is missing: `domain_error(open_id_claims,missing(Name))` The expected audience option is missing: `domain_error(open_id_claims,missing(expected_audience))` An OpenID ID-token claim has an invalid value: `domain_error(open_id_claim(Name),Value)` An OpenID ID-token time claim value is not a number: `type_error(time_number,Name-Time)` ------------------------------------------------------------------------ ###### `clear/0` Clears all cached JWKS entries. **Compilation flags:** `static` **Mode and number of proofs:** `clear` - `one` ------------------------------------------------------------------------ ###### `clear/1` Clears the cached JWKS entry for a provider. **Compilation flags:** `static` **Template:** `clear(Provider)` **Mode and number of proofs:** `clear(+compound)` - `one_or_error` **Exceptions:** The provider metadata is missing a JWKS endpoint: `domain_error(open_id_provider,missing(jwks_uri))` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `cached_jwks_/3` Cached JWKS entries indexed by URI and fetch time. **Compilation flags:** `dynamic` **Template:** `cached_jwks_(URI,FetchedAt,JWKSet)` **Mode and number of proofs:** `cached_jwks_(?atom,?number,?term)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `open_id_jwt` JWT parsing and ID-token verification helpers. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** jwt jwt_jwa list os **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `decode/3` - `verify_id_token/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `decode/3` Decodes a JWT into its header and claims JSON terms without verifying the signature. **Compilation flags:** `static` **Template:** `decode(Token,Header,Claims)` **Mode and number of proofs:** `decode(+atom,-term,-term)` - `one_or_error` **Exceptions:** `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` ------------------------------------------------------------------------ ###### `verify_id_token/5` Verifies an ID-token signature and claims using the given provider metadata and JWKS. **Compilation flags:** `static` **Template:** `verify_id_token(Token,Provider,JWKSet,Claims,Options)` **Mode and number of proofs:** `verify_id_token(+atom,+compound,+term,-term,+list(compound))` - `zero_or_one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Token` is a variable: `instantiation_error` `Token` is neither a variable nor an atom: `type_error(atom,Token)` `Token` is an atom but not a valid compact JWT: `domain_error(jwt_compact_serialization,Token)` `Token` contains Base64URL data with characters outside the Base64URL alphabet: `representation_error(base64)` The JWT header does not contain a valid `alg` member: `domain_error(jwt_header,Header)` The JWT algorithm is unsupported or disallowed: `domain_error(open_id_jwt_algorithm,Algorithm)` `JWKSet` is not a JSON Web Key Set with a `keys` list: `domain_error(jwt_jwks,JWKSet)` No compatible key exists for the JWT header: `existence_error(jwt_jwk,Header)` The selected JWK is not a supported public key: `domain_error(jwt_jwk_public_key,Key)` The ES256 signature is not 64 bytes long: `domain_error(jwt_es256_signature,Signature)` The OpenSSL executable does not exist: `existence_error(os_command,Executable)` The `iss` claim does not match the provider issuer: `domain_error(open_id_claim(iss),Value)` A required OpenID ID-token claim is missing: `domain_error(open_id_claims,missing(Name))` The expected audience option is missing: `domain_error(open_id_claims,missing(expected_audience))` An OpenID ID-token claim has an invalid value: `domain_error(open_id_claim(Name),Value)` An OpenID ID-token time claim value is not a number: `type_error(time_number,Name-Time)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_logout` RP-initiated logout URL helpers for OpenID Connect clients. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `logout_url/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `logout_url/4` Builds a logout URL for an RP-initiated logout request. **Compilation flags:** `static` **Template:** `logout_url(Provider,Request,URL,Options)` **Mode and number of proofs:** `logout_url(+compound,+compound,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Request` is neither a direct options list nor a request wrapper term containing an options list: `domain_error(open_id_options,Request)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` The provider metadata is missing an end-session endpoint: `domain_error(open_id_provider,missing(end_session_endpoint))` A request value that must be an atom is not an atom: `type_error(atom,Value)` A `ui_locales` value is neither an atom nor a list of atoms: `domain_error(open_id_space_separated_atom,Value)` The `post_logout_redirect_uri` is not secure: `domain_error(open_id_post_logout_redirect_uri,URL)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_openssl` OpenSSL-backed JWT signature verification helpers. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-17 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** crypto list open_id_der os process **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `verify/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `verify/5` Verifies a JWT signing input and signature using OpenSSL and a PEM public key. **Compilation flags:** `static` **Template:** `verify(Algorithm,PEM,SigningInput,Signature,Options)` **Mode and number of proofs:** `verify(+atom,+atom,+atom,+list(byte),+list(compound))` - `zero_or_one_or_error` **Exceptions:** The OpenSSL executable does not exist: `existence_error(os_command,Executable)` `Signature` is not a 64-byte raw ES256 signature: `domain_error(open_id_es256_signature,Signature)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_pkce` PKCE and authorization-request helpers for OpenID Connect clients. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** crypto sha256 user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `code_verifier/2` - `code_challenge/2` - `authorization_url/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `code_verifier/2` Returns a valid PKCE code verifier, either provided in options or freshly generated. **Compilation flags:** `static` **Template:** `code_verifier(Verifier,Options)` **Mode and number of proofs:** `code_verifier(-atom,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Verifier` is a variable: `instantiation_error` `Verifier` is not a valid PKCE code verifier: `domain_error(open_id_code_verifier,Verifier)` ------------------------------------------------------------------------ ###### `code_challenge/2` Computes the S256 PKCE code challenge for a code verifier. **Compilation flags:** `static` **Template:** `code_challenge(Verifier,Challenge)` **Mode and number of proofs:** `code_challenge(+atom,-atom)` - `one_or_error` **Exceptions:** `Verifier` is a variable: `instantiation_error` `Verifier` is not a valid PKCE code verifier: `domain_error(open_id_code_verifier,Verifier)` ------------------------------------------------------------------------ ###### `authorization_url/5` Builds an authorization URL and session data for an Authorization Code plus PKCE flow. **Compilation flags:** `static` **Template:** `authorization_url(Provider,Request,URL,Session,Options)` **Mode and number of proofs:** `authorization_url(+compound,+compound,-atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Request` is neither a direct options list nor a request wrapper term containing an options list: `domain_error(open_id_options,Request)` `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Request` is missing a required authorization request option: `domain_error(open_id_authorization_request,missing(Name))` A request value that must be an atom is not an atom: `type_error(atom,Value)` A scope value is neither an atom nor a list of atoms: `domain_error(open_id_space_separated_atom,Value)` The PKCE code verifier is a variable: `instantiation_error` The PKCE code verifier is not valid: `domain_error(open_id_code_verifier,Verifier)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `open_id_response` Authorization callback parsing and state validation helpers. **Availability:** `logtalk_load(open_id(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` open_id_helpers **Uses:** http_core list url(Representation) user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `authorization_response/3` - `authorization_code/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `authorization_response/3` Parses an authorization callback URL into either an authorization response or an authorization error term. **Compilation flags:** `static` **Template:** `authorization_response(CallbackURL,Response,Options)` **Mode and number of proofs:** `authorization_response(+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `CallbackURL` is a variable: `instantiation_error` `CallbackURL` is not a valid URL or relative reference: `domain_error(open_id_authorization_response,CallbackURL)` The callback URL does not contain a query component and fragment parsing is not allowed: `domain_error(open_id_authorization_response,missing(parameters))` The callback response is missing a required member: `domain_error(open_id_authorization_response,missing(Name))` The callback issuer does not match the provider issuer: `domain_error(open_id_authorization_response,issuer_mismatch(Expected,Actual))` ------------------------------------------------------------------------ ###### `authorization_code/4` Parses an authorization callback URL, validates the returned state against the session, and returns the authorization code. **Compilation flags:** `static` **Template:** `authorization_code(CallbackURL,Session,Code,Options)` **Mode and number of proofs:** `authorization_code(+atom,+compound,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable or a partial list: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Session` is missing required state data: `domain_error(open_id_session,missing(Session,state))` The callback response is an authorization error: `domain_error(open_id_authorization_response,authorization_error(Response))` The callback response state does not match the session state: `domain_error(open_id_authorization_response,state_mismatch(Expected,Actual))` The callback response is missing a required member: `domain_error(open_id_authorization_response,missing(Name))` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### optics_clusterer") **object** #### `optics_clusterer` OPTICS clusterer for continuous datasets. Learns an ordering from a dataset object implementing the `clustering_dataset_protocol` protocol and extracts clusters using an epsilon threshold so the result can be used with the standard clusterer protocol. **Availability:** `logtalk_load(optics_clusterer(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-22 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` clusterer_common `public` search_indexing **Uses:** avltree binary_heap_min format list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_clusterer/1  check_option/1  check_options/1  cluster/3  clusterer_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_clusterer/1  valid_clusterer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also clusterer_protocol, clustering_dataset_protocol, dbscan_clusterer ### optionals") **object** #### `maybe` Types and predicates for type-checking and handling optional terms. Inspired by Haskell. **Availability:** `logtalk_load(optionals(loader))` **Author:** Paulo Moura **Version:** 0:9:0 **Date:** 2025-06-19 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** type::type/1 type::check/2 arbitrary::arbitrary/1 arbitrary::arbitrary/2 arbitrary::shrinker/1 arbitrary::shrink/3 arbitrary::edge_case/2 **Uses:** optional optional(Optional) random type **Remarks:** > - Type-checking support: Defines type `maybe(Type)` for checking optional terms where the value hold by the optional term must be of the given type. > > - QuickCheck support: Defines clauses for the `arbitrary::arbitrary/1-2`, `arbitrary::shrinker/1`, `arbitrary::shrink/3`, and `arbitrary::edge_case/2` predicates to allow generating random values for the `maybe(Type)` type. **Inherited public predicates:** (none) - Public predicates - `cat/2` - `sequence/2` - `traverse/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `cat/2` Returns the values stored in the non-empty optional terms. **Compilation flags:** `static` **Template:** `cat(Optionals,Values)` **Mode and number of proofs:** `cat(+list(optional),-list)` - `one` ------------------------------------------------------------------------ ###### `sequence/2` Returns an optional term with a list of all values when all optional terms are not empty. Otherwise returns an empty optional term. **Compilation flags:** `static` **Template:** `sequence(Optionals,Optional)` **Mode and number of proofs:** `sequence(+list(optional),--nonvar)` - `one` ------------------------------------------------------------------------ ###### `traverse/3` Applies a closure to each list element to generate optional terms and then sequences them into a single optional term holding all values or an empty optional term. **Compilation flags:** `static` **Template:** `traverse(Closure,Terms,Optional)` **Meta-predicate template:** `traverse(2,*,*)` **Mode and number of proofs:** `traverse(+callable,+list,--nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also optional, optional(Optional), type, arbitrary **object** #### `optional` Constructors for optional terms. An optional term is either empty or holds a value. Optional terms should be regarded as opaque terms and always used with the `optional/1` object by passing the optional term as a parameter. **Availability:** `logtalk_load(optionals(loader))` **Author:** Paulo Moura **Version:** 2:2:0 **Date:** 2026-02-21 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** type::type/1 type::check/2 **Remarks:** > - Type-checking support: This object also defines a type `optional` for use with the `type` library object. **Inherited public predicates:** (none) - Public predicates - `empty/1` - `of/2` - `from_goal/3` - `from_goal/2` - `from_generator/3` - `from_generator/2` - `from_goal_or_throw/3` - `from_goal_or_throw/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `empty/1` Constructs an empty optional term. **Compilation flags:** `static` **Template:** `empty(Optional)` **Mode and number of proofs:** `empty(--nonvar)` - `one` ------------------------------------------------------------------------ ###### `of/2` Constructs an optional term holding the given value. **Compilation flags:** `static` **Template:** `of(Value,Optional)` **Mode and number of proofs:** `of(@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_goal/3` Constructs an optional term holding a value bound by calling the given goal. Returns an empty optional term if the goal fails. Also returns an empty optional term if the goal throws an error, silently discarding the error information. Use `from_goal_or_throw/3` if exceptions should be propagated or the `expected` library `from_goal/3` predicate if error information should be preserved. **Compilation flags:** `static` **Template:** `from_goal(Goal,Value,Optional)` **Meta-predicate template:** `from_goal(0,*,*)` **Mode and number of proofs:** `from_goal(+callable,--term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_goal/2` Constructs an optional term holding a value bound by calling the given closure. Returns an empty optional term if the closure fails. Also returns an empty optional term if the closure throws an error, silently discarding the error information. Use `from_goal_or_throw/2` if exceptions should be propagated or the `expected` library `from_goal/2` predicate if error information should be preserved. **Compilation flags:** `static` **Template:** `from_goal(Closure,Optional)` **Meta-predicate template:** `from_goal(1,*)` **Mode and number of proofs:** `from_goal(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_generator/3` Constructs optional terms with the values generated by calling the given goal. On goal failure, returns an empty optional. On goal error, also returns an empty optional, silently discarding the error information. **Compilation flags:** `static` **Template:** `from_generator(Goal,Value,Optional)` **Meta-predicate template:** `from_generator(0,*,*)` **Mode and number of proofs:** `from_generator(+callable,--term,--nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `from_generator/2` Constructs optional terms with the values generated by calling the given closure. On closure failure, returns an empty optional. On closure error, also returns an empty optional, silently discarding the error information. **Compilation flags:** `static` **Template:** `from_generator(Closure,Optional)` **Meta-predicate template:** `from_generator(1,*)` **Mode and number of proofs:** `from_generator(+from_generator,--nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `from_goal_or_throw/3` Constructs an optional term holding a value bound by calling the given goal. Returns an empty optional term if the goal fails. Propagates any exception thrown by the goal. **Compilation flags:** `static` **Template:** `from_goal_or_throw(Goal,Value,Optional)` **Meta-predicate template:** `from_goal_or_throw(0,*,*)` **Mode and number of proofs:** `from_goal_or_throw(+callable,--term,--nonvar)` - `one_or_error` ------------------------------------------------------------------------ ###### `from_goal_or_throw/2` Constructs an optional term holding a value bound by calling the given closure. Returns an empty optional term if the closure fails. Propagates any exception thrown by the closure. **Compilation flags:** `static` **Template:** `from_goal_or_throw(Closure,Optional)` **Meta-predicate template:** `from_goal_or_throw(1,*)` **Mode and number of proofs:** `from_goal_or_throw(+callable,--nonvar)` - `one_or_error` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also optional(Optional), type **object** #### `optional(Optional)` Optional term handling predicates. Requires passing an optional term (constructed using the `optional` object predicates) as a parameter. **Availability:** `logtalk_load(optionals(loader))` **Author:** Paulo Moura **Version:** 1:9:0 **Date:** 2025-06-19 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `is_empty/0` - `is_present/0` - `if_empty/1` - `if_present/1` - `if_present_or_else/2` - `filter/2` - `map/2` - `flat_map/2` - `or/2` - `get/1` - `or_else/2` - `or_else_get/2` - `or_else_call/2` - `or_else_fail/1` - `or_else_throw/2` - `map_or_else/3` - `zip/3` - `flatten/1` - `to_expected/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `is_empty/0` True if the optional term is empty. See also the `if_empty/1` predicate. **Compilation flags:** `static` **Mode and number of proofs:** `is_empty` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_present/0` True if the optional term holds a value. See also the `if_present/1` predicate. **Compilation flags:** `static` **Mode and number of proofs:** `is_present` - `zero_or_one` ------------------------------------------------------------------------ ###### `if_empty/1` Calls a goal if the optional term is empty. Succeeds otherwise. **Compilation flags:** `static` **Template:** `if_empty(Goal)` **Meta-predicate template:** `if_empty(0)` **Mode and number of proofs:** `if_empty(+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `if_present/1` Applies a closure to the value hold by the optional term if not empty. Succeeds otherwise. **Compilation flags:** `static` **Template:** `if_present(Closure)` **Meta-predicate template:** `if_present(1)` **Mode and number of proofs:** `if_present(+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `if_present_or_else/2` Applies a closure to the value hold by the optional term if not empty. Otherwise calls the given goal. **Compilation flags:** `static` **Template:** `if_present_or_else(Closure,Goal)` **Meta-predicate template:** `if_present_or_else(1,0)` **Mode and number of proofs:** `if_present_or_else(+callable,+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `filter/2` Returns the optional term when it is not empty and the value it holds satisfies a closure. Otherwise returns an empty optional term. **Compilation flags:** `static` **Template:** `filter(Closure,NewOptional)` **Meta-predicate template:** `filter(1,*)` **Mode and number of proofs:** `filter(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map/2` When the optional term is not empty and mapping a closure with the value it holds and the new value as additional arguments is successful, returns an optional term with the new value. Otherwise returns an empty optional term. **Compilation flags:** `static` **Template:** `map(Closure,NewOptional)` **Meta-predicate template:** `map(2,*)` **Mode and number of proofs:** `map(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `flat_map/2` When the optional term is not empty and mapping a closure with the value it holds and the new optional term as additional arguments is successful, returns the new optional term. Otherwise returns an empty optional term. **Compilation flags:** `static` **Template:** `flat_map(Closure,NewOptional)` **Meta-predicate template:** `flat_map(2,*)` **Mode and number of proofs:** `flat_map(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `or/2` Returns the same optional term if not empty. Otherwise calls closure to generate a new optional term. Fails if optional term is empty and calling the closure fails or throws an error. **Compilation flags:** `static` **Template:** `or(NewOptional,Closure)` **Meta-predicate template:** `or(*,1)` **Mode and number of proofs:** `or(--term,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `get/1` Returns the value hold by the optional term if not empty. Throws an error otherwise. **Compilation flags:** `static` **Template:** `get(Value)` **Mode and number of proofs:** `get(--term)` - `one_or_error` **Exceptions:** Optional is empty: `existence_error(optional_term,Optional)` ------------------------------------------------------------------------ ###### `or_else/2` Returns the value hold by the optional term if not empty or the given default value if the optional term is empty. **Compilation flags:** `static` **Template:** `or_else(Value,Default)` **Mode and number of proofs:** `or_else(--term,@term)` - `one` ------------------------------------------------------------------------ ###### `or_else_get/2` Returns the value hold by the optional term if not empty. Applies a closure to compute the value otherwise. Throws an error when the optional term is empty and the value cannot be computed. **Compilation flags:** `static` **Template:** `or_else_get(Value,Closure)` **Meta-predicate template:** `or_else_get(*,1)` **Mode and number of proofs:** `or_else_get(--term,+callable)` - `one_or_error` **Exceptions:** Optional is empty and the term cannot be computed: `existence_error(optional_term,Optional)` ------------------------------------------------------------------------ ###### `or_else_call/2` Returns the value hold by the optional term if not empty or calls a goal deterministically if the optional term is empty. **Compilation flags:** `static` **Template:** `or_else_call(Value,Goal)` **Meta-predicate template:** `or_else_call(*,0)` **Mode and number of proofs:** `or_else_call(--term,+callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `or_else_fail/1` Returns the value hold by the optional term if not empty. Fails otherwise. Usually called to skip over empty optional terms. **Compilation flags:** `static` **Template:** `or_else_fail(Value)` **Mode and number of proofs:** `or_else_fail(--term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `or_else_throw/2` Returns the value hold by the optional term if not empty. Throws the given error otherwise. **Compilation flags:** `static` **Template:** `or_else_throw(Value,Error)` **Mode and number of proofs:** `or_else_throw(--term,@nonvar)` - `one_or_error` ------------------------------------------------------------------------ ###### `map_or_else/3` When the optional term is not empty and mapping a closure with the value it holds and the new value as additional arguments is successful, returns the new value. Otherwise returns the given default value. **Compilation flags:** `static` **Template:** `map_or_else(Closure,Default,Value)` **Meta-predicate template:** `map_or_else(2,*,*)` **Mode and number of proofs:** `map_or_else(+callable,@term,--term)` - `one` ------------------------------------------------------------------------ ###### `zip/3` When both this optional and the other optional hold values and applying a closure with both values and the new value as additional arguments is successful, returns an optional term with the new value. Otherwise returns an empty optional term. **Compilation flags:** `static` **Template:** `zip(Closure,OtherOptional,NewOptional)` **Meta-predicate template:** `zip(3,*,*)` **Mode and number of proofs:** `zip(+callable,+nonvar,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `flatten/1` Flattens a nested optional term. When the optional term holds a value that is itself an optional term, returns the inner optional term. When the optional term holds a non-optional value, returns the same optional term. When the optional term is empty, returns an empty optional term. **Compilation flags:** `static` **Template:** `flatten(NewOptional)` **Mode and number of proofs:** `flatten(--nonvar)` - `one` ------------------------------------------------------------------------ ###### `to_expected/2` Converts the optional term to an expected term. Returns an expected term holding the value if the optional term is not empty. Returns an expected term with the given error otherwise. **Compilation flags:** `static` **Template:** `to_expected(Error,Expected)` **Mode and number of proofs:** `to_expected(@term,--nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also optional ### options") **category** #### `options` Options processing predicates. Options are represented by compound terms where the functor is the option name. **Availability:** `logtalk_load(options(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2022-01-03 **Compilation flags:** `static` **Implements:** `public` options_protocol **Uses:** list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `options_protocol` Options protocol. **Availability:** `logtalk_load(options(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2022-01-03 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `check_option/1` - `check_options/1` - `valid_option/1` - `valid_options/1` - `default_option/1` - `default_options/1` - `option/2` - `option/3` - Protected predicates - `merge_options/2` - `fix_options/2` - `fix_option/2` - Private predicates - Operators ##### Public predicates ###### `check_option/1` Succeeds if the option is valid. Throws an error otherwise. **Compilation flags:** `static` **Template:** `check_option(Option)` **Mode and number of proofs:** `check_option(@term)` - `one_or_error` **Exceptions:** `Option` is a variable: `instantiation_error` `Option` is neither a variable nor a compound term: `type_error(compound,Option)` `Option` is a compound term but not a valid option: `domain_error(option,Option)` ------------------------------------------------------------------------ ###### `check_options/1` Succeeds if all the options in a list are valid. Throws an error otherwise. **Compilation flags:** `static` **Template:** `check_options(Options)` **Mode and number of proofs:** `check_options(@term)` - `one_or_error` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` ------------------------------------------------------------------------ ###### `valid_option/1` Succeeds if the option is valid. **Compilation flags:** `static` **Template:** `valid_option(Option)` **Mode and number of proofs:** `valid_option(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_options/1` Succeeds if all the options in a list are valid. **Compilation flags:** `static` **Template:** `valid_options(Options)` **Mode and number of proofs:** `valid_options(@term)` - `one` ------------------------------------------------------------------------ ###### `default_option/1` Enumerates, by backtracking, the default options. **Compilation flags:** `static` **Template:** `default_option(Option)` **Mode and number of proofs:** `default_option(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `default_options/1` Returns a list of the default options. **Compilation flags:** `static` **Template:** `default_options(Options)` **Mode and number of proofs:** `default_options(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `option/2` True iff `Option` unifies with the first occurrence of the same option in the `Options` list. **Compilation flags:** `static` **Template:** `option(Option,Options)` **Mode and number of proofs:** `option(+compound,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `option/3` True iff `Option` unifies with the first occurrence of the same option in the `Options` list or, when that is not the case, if `Option` unifies with `Default`. **Compilation flags:** `static` **Template:** `option(Option,Options,Default)` **Mode and number of proofs:** `option(+compound,+list(compound),+compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates ###### `merge_options/2` Merges the user options with the default options, returning the final list of options. Calls the `fix_options/2` predicate to preprocess the options after merging. Callers must ensure, if required, that the user options are valid. **Compilation flags:** `static` **Template:** `merge_options(UserOptions,Options)` **Mode and number of proofs:** `merge_options(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `fix_options/2` Fixes a list of options, returning the list of options. **Compilation flags:** `static` **Template:** `fix_options(Options,FixedOptions)` **Mode and number of proofs:** `fix_options(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `fix_option/2` Fixes an option. **Compilation flags:** `static` **Template:** `fix_option(Option,FixedOption)` **Mode and number of proofs:** `fix_option(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (none) ##### Operators (none) See also options ### os") **object** #### `os` Portable operating-system access predicates. **Availability:** `logtalk_load(os(loader))` **Author:** Paulo Moura **Version:** 1:104:0 **Date:** 2026-06-10 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` osp **Uses:** atom list **Aliases:** `osp` `absolute_file_name/2` as `expand_path/2` **Remarks:** > - File path expansion: To ensure portability, all file paths are expanded before being handed to the backend Prolog system. > > - Exception terms: Currently, there is no standardization of the exception terms thrown by the different backend Prolog systems. > > - B-Prolog portability: The `wall_time/1` predicate is not supported. > > - CxProlog portability: The `date_time/7` predicate returns zeros for all arguments. > > - JIProlog portability: The `file_permission/2` and `command_line_arguments/1` predicates are not supported. > > - Quintus Prolog: The `pid/1` and `shell/2` predicates are not supported. > > - XSB portability: The `command_line_arguments/1` predicate is not supported. **Inherited public predicates:**  absolute_file_name/2  change_directory/1  command_line_arguments/1  copy_file/2  cpu_time/1  date_time/7  decompose_file_name/3  decompose_file_name/4  delete_directory/1  delete_directory_and_contents/1  delete_directory_contents/1  delete_file/1  directory_exists/1  directory_files/2  directory_files/3  ensure_directory/1  ensure_file/1  environment_variable/2  file_exists/1  file_modification_time/2  file_permission/2  file_size/2  full_device_path/1  internal_os_path/2  is_absolute_file_name/1  make_directory/1  make_directory_path/1  null_device_path/1  operating_system_machine/1  operating_system_name/1  operating_system_release/1  operating_system_type/1  path_concat/3  pid/1  read_only_device_path/1  rename_file/2  resolve_command_path/2  shell/1  shell/2  sleep/1  temporary_directory/1  time_stamp/1  wall_time/1  working_directory/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also os_types **category** #### `os_types` A set of operating-system related types. **Availability:** `logtalk_load(os(loader))` **Author:** Paulo Moura **Version:** 1:4:0 **Date:** 2021-02-12 **Compilation flags:** `static` **Provides:** type::type/1 type::check/2 **Uses:** list os **Remarks:** > - Provided types: This category adds `file`, `file(Extensions)`, `file(Extensions,Permissions)`, `directory`, `directory(Permissions)`, and `environment_variable` types for type-checking when using the `type` library object. > > - Type `file`: For checking if a term is an atom and an existing file. > > - Type `file(Extensions)`: For checking if a term is an atom and an existing file with one of the listed extensions (specified as `'.ext'`). > > - Type `file(Extensions,Permissions)`: For checking if a term is an atom and an existing file with one of the listed extensions (specified as `'.ext'`) and listed permissions ({`read`, `write`, `execute`}). > > - Type `directory`: For checking if a term is an atom and an existing directory. > > - Type `directory(Permissions)`: For checking if a term is an atom and an existing directory with the listed permissions ({`read`, `write`, `execute`}). > > - Type `environment_variable`: For checking if a term is an atom and an existing environment variable. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also osp, os, type **protocol** #### `osp` Portable operating-system access protocol. **Availability:** `logtalk_load(os(loader))` **Author:** Paulo Moura **Version:** 1:44:0 **Date:** 2026-06-10 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Error handling: Predicates that require a file or directory to exist throw an error when that is not the case. But the exact exception term is currently backend Prolog compiler dependent. > > - CPU and wall time accuracy: Depends on the backend and can be different between CPU and wall time (e.g. CPU time can have nanosecond accuracy with wall time only having millisecond accuracy). **Inherited public predicates:** (none) - Public predicates - `pid/1` - `shell/2` - `shell/1` - `is_absolute_file_name/1` - `absolute_file_name/2` - `decompose_file_name/3` - `decompose_file_name/4` - `path_concat/3` - `internal_os_path/2` - `make_directory/1` - `make_directory_path/1` - `delete_directory/1` - `delete_directory_contents/1` - `delete_directory_and_contents/1` - `change_directory/1` - `working_directory/1` - `temporary_directory/1` - `null_device_path/1` - `full_device_path/1` - `read_only_device_path/1` - `resolve_command_path/2` - `directory_files/2` - `directory_files/3` - `directory_exists/1` - `ensure_directory/1` - `file_exists/1` - `file_modification_time/2` - `file_size/2` - `file_permission/2` - `copy_file/2` - `rename_file/2` - `delete_file/1` - `ensure_file/1` - `environment_variable/2` - `time_stamp/1` - `date_time/7` - `cpu_time/1` - `wall_time/1` - `operating_system_type/1` - `operating_system_name/1` - `operating_system_machine/1` - `operating_system_release/1` - `command_line_arguments/1` - `sleep/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `pid/1` Returns the process identifier of the running process. **Compilation flags:** `static` **Template:** `pid(PID)` **Mode and number of proofs:** `pid(-integer)` - `one` ------------------------------------------------------------------------ ###### `shell/2` Runs an operating-system shell command and returns its exit status. **Compilation flags:** `static` **Template:** `shell(Command,Status)` **Mode and number of proofs:** `shell(+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `shell/1` Runs an operating-system shell command. **Compilation flags:** `static` **Template:** `shell(Command)` **Mode and number of proofs:** `shell(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_absolute_file_name/1` True iff the argument is an absolute file path. On POSIX systems, this predicate is true if `File` starts with a `/`. On Windows systems, this predicate is true if `File` starts with a drive letter. No attempt is made to expand `File` as a path. **Compilation flags:** `static` **Template:** `is_absolute_file_name(File)` **Mode and number of proofs:** `is_absolute_file_name(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `absolute_file_name/2` Expands a file name to an absolute file path. An environment variable at the beginning of the file name is also expanded. A slash at the end of `File` is preserved in `Path`. **Compilation flags:** `static` **Template:** `absolute_file_name(File,Path)` **Mode and number of proofs:** `absolute_file_name(+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `decompose_file_name/3` Decomposes a file name into its directory (which always ends with a slash; `./` is returned if absent) and its basename (which can be the empty atom). **Compilation flags:** `static` **Template:** `decompose_file_name(File,Directory,Basename)` **Mode and number of proofs:** `decompose_file_name(+atom,?atom,?atom)` - `one` ------------------------------------------------------------------------ ###### `decompose_file_name/4` Decomposes a file name into its directory (which always ends with a slash; `./` is returned if absent), name (that can be the empty atom), and extension (which starts with a `.` when defined; the empty atom otherwise). **Compilation flags:** `static` **Template:** `decompose_file_name(File,Directory,Name,Extension)` **Mode and number of proofs:** `decompose_file_name(+atom,?atom,?atom,?atom)` - `one` ------------------------------------------------------------------------ ###### `path_concat/3` Concatenates a path prefix and a path suffix, adding a `/` separator if required. Returns `Suffix` when it is an absolute path. Returns `Prefix` with a trailing `/` appended if missing when `Suffix` is the empty atom. **Compilation flags:** `static` **Template:** `path_concat(Prefix,Suffix,Path)` **Mode and number of proofs:** `path_concat(+atom,+atom,--atom)` - `one` ------------------------------------------------------------------------ ###### `internal_os_path/2` Converts between the internal path representation (which is backend dependent) and the operating-system native path representation. **Compilation flags:** `static` **Template:** `internal_os_path(InternalPath,OSPath)` **Mode and number of proofs:** `internal_os_path(+atom,-atom)` - `one` `internal_os_path(-atom,+atom)` - `one` ------------------------------------------------------------------------ ###### `make_directory/1` Makes a new directory. Succeeds if the directory already exists. **Compilation flags:** `static` **Template:** `make_directory(Directory)` **Mode and number of proofs:** `make_directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `make_directory_path/1` Makes a new directory creating all the intermediate directories if necessary. Succeeds if the directory already exists. **Compilation flags:** `static` **Template:** `make_directory_path(Directory)` **Mode and number of proofs:** `make_directory_path(+atom)` - `one` ------------------------------------------------------------------------ ###### `delete_directory/1` Deletes an empty directory. Throws an error if the directory does not exist. **Compilation flags:** `static` **Template:** `delete_directory(Directory)` **Mode and number of proofs:** `delete_directory(+atom)` - `one_or_error` ------------------------------------------------------------------------ ###### `delete_directory_contents/1` Deletes directory contents. Throws an error if the directory does not exist. **Compilation flags:** `static` **Template:** `delete_directory_contents(Directory)` **Mode and number of proofs:** `delete_directory_contents(+atom)` - `one_or_error` ------------------------------------------------------------------------ ###### `delete_directory_and_contents/1` Deletes directory and its contents. Throws an error if the directory does not exist. **Compilation flags:** `static` **Template:** `delete_directory_and_contents(Directory)` **Mode and number of proofs:** `delete_directory_and_contents(+atom)` - `one_or_error` ------------------------------------------------------------------------ ###### `change_directory/1` Changes current working directory. Throws an error if the directory does not exist. **Compilation flags:** `static` **Template:** `change_directory(Directory)` **Mode and number of proofs:** `change_directory(+atom)` - `one_or_error` ------------------------------------------------------------------------ ###### `working_directory/1` Current working directory. **Compilation flags:** `static` **Template:** `working_directory(Directory)` **Mode and number of proofs:** `working_directory(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `temporary_directory/1` Temporary directory. Tries first environment variables: `TEMP` and `TMP` on Windows systems; `TMPDIR` on POSIX systems. When not defined, tries default locations. Returns the working directory as last resort. **Compilation flags:** `static` **Template:** `temporary_directory(Directory)` **Mode and number of proofs:** `temporary_directory(?atom)` - `one` ------------------------------------------------------------------------ ###### `null_device_path/1` Null device path: `nul` on Windows systems and `/dev/null` on POSIX systems. **Compilation flags:** `static` **Template:** `null_device_path(Path)` **Mode and number of proofs:** `null_device_path(?atom)` - `one` ------------------------------------------------------------------------ ###### `full_device_path/1` Full device path: `/dev/full` on Linux and BSD systems. Fails on other systems. Experimental. **Compilation flags:** `static` **Template:** `full_device_path(Path)` **Mode and number of proofs:** `full_device_path(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `read_only_device_path/1` Read-only device path: `/dev/urandom` on macOS. Fails on other systems. Experimental. **Compilation flags:** `static` **Template:** `read_only_device_path(Path)` **Mode and number of proofs:** `read_only_device_path(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `resolve_command_path/2` Resolves a command path given its name. **Compilation flags:** `static` **Template:** `resolve_command_path(Command,Path)` **Mode and number of proofs:** `resolve_command_path(+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `directory_files/2` Returns a list of all files (including directories, regular files, and hidden directories and files) in a directory. File paths are relative to the directory. Throws an error if the directory does not exist. **Compilation flags:** `static` **Template:** `directory_files(Directory,Files)` **Mode and number of proofs:** `directory_files(+atom,-list(atom))` - `one_or_error` ------------------------------------------------------------------------ ###### `directory_files/3` Returns a list of files filtered using the given list of options. Invalid options are ignored. Default option values are equivalent to `directory_files/2`. Throws an error if the directory does not exist. **Compilation flags:** `static` **Template:** `directory_files(Directory,Files,Options)` **Mode and number of proofs:** `directory_files(+atom,-list(atom),+list(compound))` - `one_or_error` **Remarks:** > - Option `paths/1`: Possible values are `relative` and `absolute`. Default is `relative`. > > - Option `type/1`: Possible values are `all`, `regular`, `directory`. Default is `all`. > > - Option `extensions/1`: Argument is a list of required extensions (using the format `'.ext'`). Default is the empty list. > > - Option `prefixes/1`: Argument is a list of required file prefixes (atoms). Default is the empty list. > > - Option `suffixes/1`: Argument is a list of required file suffixes (atoms). Default is the empty list. > > - Option `dot_files/1`: Possible values are `true` and `false`. Default is `true`. ------------------------------------------------------------------------ ###### `directory_exists/1` True if the specified directory exists (irrespective of directory permissions). **Compilation flags:** `static` **Template:** `directory_exists(Directory)` **Mode and number of proofs:** `directory_exists(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `ensure_directory/1` Ensures that a directory exists, creating it if necessary. **Compilation flags:** `static` **Template:** `ensure_directory(Directory)` **Mode and number of proofs:** `ensure_directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `file_exists/1` True if the specified file exists and is a regular file (irrespective of file permissions). **Compilation flags:** `static` **Template:** `file_exists(File)` **Mode and number of proofs:** `file_exists(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `file_modification_time/2` File modification time (which can be used for comparison). Throws an error if the file does not exist. **Compilation flags:** `static` **Template:** `file_modification_time(File,Time)` **Mode and number of proofs:** `file_modification_time(+atom,-integer)` - `one_or_error` ------------------------------------------------------------------------ ###### `file_size/2` File size (in bytes). Throws an error if the file does not exist. **Compilation flags:** `static` **Template:** `file_size(File,Size)` **Mode and number of proofs:** `file_size(+atom,-integer)` - `one_or_error` ------------------------------------------------------------------------ ###### `file_permission/2` True iff the specified file has the specified permission (`read`, `write`, or `execute`). Throws an error if the file does not exist. **Compilation flags:** `static` **Template:** `file_permission(File,Permission)` **Mode and number of proofs:** `file_permission(+atom,+atom)` - `zero_or_one_or_error` ------------------------------------------------------------------------ ###### `copy_file/2` Copies a file. Throws an error if the original file does not exist or if the copy cannot be created. **Compilation flags:** `static` **Template:** `copy_file(File,Copy)` **Mode and number of proofs:** `copy_file(+atom,+atom)` - `one_or_error` ------------------------------------------------------------------------ ###### `rename_file/2` Renames a file or a directory. Throws an error if the file or directory does not exist. **Compilation flags:** `static` **Template:** `rename_file(Old,New)` **Mode and number of proofs:** `rename_file(+atom,+atom)` - `one_or_error` ------------------------------------------------------------------------ ###### `delete_file/1` Deletes a file. Throws an error if the file does not exist. **Compilation flags:** `static` **Template:** `delete_file(File)` **Mode and number of proofs:** `delete_file(+atom)` - `one_or_error` ------------------------------------------------------------------------ ###### `ensure_file/1` Ensures that a file exists, creating it if necessary. **Compilation flags:** `static` **Template:** `ensure_file(File)` **Mode and number of proofs:** `ensure_file(+atom)` - `one` ------------------------------------------------------------------------ ###### `environment_variable/2` Returns an environment variable value. Fails if the variable does not exists. **Compilation flags:** `static` **Template:** `environment_variable(Variable,Value)` **Mode and number of proofs:** `environment_variable(+atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `time_stamp/1` Returns a system-dependent time stamp, which can be used for sorting, but should be regarded otherwise as an opaque term. **Compilation flags:** `static` **Template:** `time_stamp(Time)` **Mode and number of proofs:** `time_stamp(-ground)` - `one` ------------------------------------------------------------------------ ###### `date_time/7` Returns the current date and time. Note that most backends do not provide sub-second accuracy and in those cases the value of the `Milliseconds` argument is always zero. **Compilation flags:** `static` **Template:** `date_time(Year,Month,Day,Hours,Minutes,Seconds,Milliseconds)` **Mode and number of proofs:** `date_time(-integer,-integer,-integer,-integer,-integer,-integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `cpu_time/1` System cpu time in seconds. Accuracy depends on the backend. **Compilation flags:** `static` **Template:** `cpu_time(Seconds)` **Mode and number of proofs:** `cpu_time(-number)` - `one` ------------------------------------------------------------------------ ###### `wall_time/1` Wall time in seconds. Accuracy depends on the backend. **Compilation flags:** `static` **Template:** `wall_time(Seconds)` **Mode and number of proofs:** `wall_time(-number)` - `one` ------------------------------------------------------------------------ ###### `operating_system_type/1` Operating system type. Possible values are `unix`, `windows`, and `unknown`. **Compilation flags:** `static` **Template:** `operating_system_type(Type)` **Mode and number of proofs:** `operating_system_type(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `operating_system_name/1` Operating system name. On POSIX systems, it returns the value of `uname`` ``-s`. On macOS systems, it returns `'Darwin'`. On Windows systems, it returns `'Windows'`. **Compilation flags:** `static` **Template:** `operating_system_name(Name)` **Mode and number of proofs:** `operating_system_name(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `operating_system_machine/1` Operating system hardware platform. On POSIX systems, it returns the value of `uname`` ``-m`. On Windows systems, it returns the value of the `PROCESSOR_ARCHITECTURE` environment variable. **Compilation flags:** `static` **Template:** `operating_system_machine(Machine)` **Mode and number of proofs:** `operating_system_machine(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `operating_system_release/1` Operating system release. On POSIX systems, it returns the value of `uname`` ``-r`. On Windows systems, it uses `WMI` code. **Compilation flags:** `static` **Template:** `operating_system_release(Release)` **Mode and number of proofs:** `operating_system_release(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `command_line_arguments/1` Returns a list with the command line arguments that occur after `--`. **Compilation flags:** `static` **Template:** `command_line_arguments(Arguments)` **Mode and number of proofs:** `command_line_arguments(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `sleep/1` Suspends execution the given number of seconds. **Compilation flags:** `static` **Template:** `sleep(Seconds)` **Mode and number of proofs:** `sleep(+number)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also os, os_types ### otp") **object** #### `otp` HOTP and TOTP generation and verification predicates. **Availability:** `logtalk_load(otp(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-14 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` otp_protocol **Uses:** base32 hmac list **Remarks:** (none) **Inherited public predicates:**  hotp/5  hotp_verify/7  totp/5  totp_verify/7 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also base32, hmac, sha1, sha256, sha512_256 **protocol** #### `otp_protocol` Protocol for HOTP and TOTP generation and verification as specified in RFC 4226 and RFC 6238. **Availability:** `logtalk_load(otp(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-14 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `hotp/5` - `totp/5` - `hotp_verify/7` - `totp_verify/7` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `hotp/5` Computes an HOTP value for the given hash object, secret, moving counter, and number of digits. The secret can be either a raw byte list or a Base32 wrapper term of the form `base32(atom(Atom))`, `base32(chars(Chars))`, or `base32(codes(Codes))`. **Compilation flags:** `static` **Template:** `hotp(Hash,Secret,Counter,Digits,OTP)` **Mode and number of proofs:** `hotp(+object_identifier,+term,+integer,+integer,--atom)` - `one` ------------------------------------------------------------------------ ###### `totp/5` Computes a TOTP value using the standard 30-second time step and Unix epoch `T0`` ``=`` ``0` for the given hash object, secret, Unix time, and number of digits. **Compilation flags:** `static` **Template:** `totp(Hash,Secret,UnixTime,Digits,OTP)` **Mode and number of proofs:** `totp(+object_identifier,+term,+integer,+integer,--atom)` - `one` ------------------------------------------------------------------------ ###### `hotp_verify/7` Verifies an HOTP value by searching from the given counter through the bounded forward counter window. Returns the matched counter on success. **Compilation flags:** `static` **Template:** `hotp_verify(Hash,Secret,Counter,Window,Digits,OTP,MatchedCounter)` **Mode and number of proofs:** `hotp_verify(+object_identifier,+term,+integer,+integer,+integer,+atom,--integer)` - `zero_or_one_or_error` ------------------------------------------------------------------------ ###### `totp_verify/7` Verifies a TOTP value by searching within the bounded symmetric time-step window around the current time step. Returns the matched time step on success. **Compilation flags:** `static` **Template:** `totp_verify(Hash,Secret,UnixTime,Window,Digits,OTP,MatchedTimeStep)` **Mode and number of proofs:** `totp_verify(+object_identifier,+term,+integer,+integer,+integer,+atom,--integer)` - `zero_or_one_or_error` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also hmac_protocol ### packs") **protocol** #### `pack_protocol` Pack specification protocol. Objects implementing this protocol should be named after the pack with a `_pack` suffix and saved in a file with the same name as the object. **Availability:** `logtalk_load(packs(loader))` **Author:** Paulo Moura **Version:** 0:18:0 **Date:** 2025-05-21 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `name/1` - `description/1` - `license/1` - `home/1` - `version/6` - `note/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `name/1` Pack name. **Compilation flags:** `static` **Template:** `name(Name)` **Mode and number of proofs:** `name(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `description/1` Pack one line description. **Compilation flags:** `static` **Template:** `description(Description)` **Mode and number of proofs:** `description(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `license/1` Pack license. Specified using the identifier from the SPDX License List (https://spdx.org/licenses/) when possible. **Compilation flags:** `static` **Template:** `license(License)` **Mode and number of proofs:** `license(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `home/1` Pack home HTTPS or file URL. **Compilation flags:** `static` **Template:** `home(Home)` **Mode and number of proofs:** `home(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `version/6` Table of available versions. **Compilation flags:** `static` **Template:** `version(Version,Status,URL,Checksum,Dependencies,Portability)` **Mode and number of proofs:** `version(?compound,?atom,-atom,-pair(atom,atom),-list(pair(atom,callable)),?atom)` - `zero_or_more` `version(?compound,?atom,-atom,-pair(atom,atom),-list(pair(atom,callable)),-list(atom))` - `zero_or_more` **Remarks:** > - Version: This argument uses the same format as entity versions: `Major:Minor:Patch`. Semantic versioning should be used. > > - Status: Version development status: `stable`, `rc`, `beta`, `alpha`, `experimental`, or `deprecated`. > > - URL: File URL for a local directory, file URL for a local archive, download HTTPS URL for the pack archive, or download git archive URL for the pack archive. > > - Checksum: A pair where the key is the hash algorithm and the value is the checksum. Currently, the hash algorithm must be `sha256`. For `file://` URLs of local directories, use `none` instead of a pair. > > - Dependencies: Pack dependencies list. Each dependency is a `Dependency`` ``Operator`` ``Version` term. `Operator` is a term comparison operator. Valid `Dependency` values are `Registry::Pack`, `os(Name,Machine)`, `logtalk`, and a backend identifier atom. > > - Portability: Either the atom `all` or a list of the supported backend Prolog compilers (using the identifier atoms used by the `prolog_dialect` flag). > > - Clause order: Versions must be listed ordered from newest to oldest. ------------------------------------------------------------------------ ###### `note/3` Table of notes per action and version. **Compilation flags:** `static` **Template:** `note(Action,Version,Note)` **Mode and number of proofs:** `note(?atom,?term,-atom)` - `zero_or_more` **Remarks:** > - Action: Possible values are `install`, `update`, and `uninstall`. When unbound, the note apply to all actions. > > - Version: Version being installed, updated, or uninstalled. When unbound, the note apply to all versions. > > - Note: Note to print when performing an action on a pack version. ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `packs` Pack handling predicates. **Availability:** `logtalk_load(packs(loader))` **Author:** Paulo Moura **Version:** 0:90:0 **Date:** 2026-05-19 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` packs_common `public` options **Uses:** git list logtalk os registries type user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  help/0  logtalk_packs/0  logtalk_packs/1  option/2  option/3  pin/0  pin/1  pinned/1  prefix/0  prefix/1  readme/1  readme/2  reset/0  setup/0  unpin/0  unpin/1  valid_option/1  valid_options/1  verify_commands_availability/0 - Public predicates - `available/2` - `available/1` - `available/0` - `installed/4` - `installed/3` - `installed/1` - `installed/0` - `outdated/5` - `outdated/4` - `outdated/2` - `outdated/1` - `outdated/0` - `orphaned/2` - `orphaned/0` - `versions/3` - `describe/2` - `describe/1` - `pack_metadata/4` - `pack_property/4` - `pack_object/3` - `loaded_pack/3` - `loaded_pack_file/4` - `search/1` - `pack_dependency/6` - `loaded_pack_dependency/6` - `install/4` - `install/3` - `install/2` - `install/1` - `update/3` - `update/2` - `update/1` - `update/0` - `uninstall/2` - `uninstall/1` - `uninstall/0` - `clean/2` - `clean/1` - `clean/0` - `save/2` - `save/1` - `restore/2` - `restore/1` - `dependents/3` - `dependents/2` - `dependents/1` - `lint/2` - `lint/1` - `lint/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `available/2` Enumerates, by backtracking, all available packs. **Compilation flags:** `static` **Template:** `available(Registry,Pack)` **Mode and number of proofs:** `available(?atom,?atom)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `available/1` Lists all the packs that are available for installation from the given registry. **Compilation flags:** `static` **Template:** `available(Registry)` **Mode and number of proofs:** `available(+atom)` - `one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` ------------------------------------------------------------------------ ###### `available/0` Lists all the packs that are available for installation from all defined registries. **Compilation flags:** `static` **Mode and number of proofs:** `available` - `one` ------------------------------------------------------------------------ ###### `installed/4` Enumerates by backtracking all installed packs. **Compilation flags:** `static` **Template:** `installed(Registry,Pack,Version,Pinned)` **Mode and number of proofs:** `installed(?atom,?atom,?compound,?boolean)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` `Pinned` is neither a variable nor a boolean: `type_error(boolean,Pinned)` ------------------------------------------------------------------------ ###### `installed/3` Enumerates by backtracking all installed packs. **Compilation flags:** `static` **Template:** `installed(Registry,Pack,Version)` **Mode and number of proofs:** `installed(?atom,?atom,?compound)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` ------------------------------------------------------------------------ ###### `installed/1` Lists all the packs that are installed from the given registry. Fails if the registry is unknown. **Compilation flags:** `static` **Template:** `installed(Registry)` **Mode and number of proofs:** `installed(+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` ------------------------------------------------------------------------ ###### `installed/0` Lists all the packs that are installed. **Compilation flags:** `static` **Mode and number of proofs:** `installed` - `one` ------------------------------------------------------------------------ ###### `outdated/5` Enumerates by backtracking all installed but outdated packs (together with the current version installed and the latest version available) using the given options. **Compilation flags:** `static` **Template:** `outdated(Registry,Pack,Version,LatestVersion,Options)` **Mode and number of proofs:** `outdated(?atom,?atom,?compound,?compound,++list(compound))` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` `LatestVersion` is neither a variable nor a compound term: `type_error(compound,LatestVersion)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `compatible(Boolean)` option: Restrict listing to compatible packs. Default is `true`. > > - `status(Status)` option: Restrict listing to updates with the given status. Default is `[stable,rc,beta,alpha]`. Set to `all` to also list `experimental` and `deprecated` updates. ------------------------------------------------------------------------ ###### `outdated/4` Enumerates by backtracking all installed but outdated packs (together with the current version installed and the latest version available) using default options. **Compilation flags:** `static` **Template:** `outdated(Registry,Pack,Version,LatestVersion)` **Mode and number of proofs:** `outdated(?atom,?atom,?compound,?compound)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` `LatestVersion` is neither a variable nor a compound term: `type_error(compound,LatestVersion)` **See also:** outdated/5 ------------------------------------------------------------------------ ###### `outdated/2` Lists all the packs from the given registry that are installed but outdated using the given options. **Compilation flags:** `static` **Template:** `outdated(Registry,Options)` **Mode and number of proofs:** `outdated(+atom,++list(compound))` - `one` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `compatible(Boolean)` option: Restrict installation to compatible packs. Default is `true`. > > - `status(Status)` option: Restrict listing to updates with the given status. Default is `[stable,rc,beta,alpha]`. Set to `all` to also list `experimental` and `deprecated` updates. ------------------------------------------------------------------------ ###### `outdated/1` Lists all the packs from the given registry that are installed but outdated using default options. **Compilation flags:** `static` **Template:** `outdated(Registry)` **Mode and number of proofs:** `outdated(+atom)` - `one` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` **See also:** outdated/2 ------------------------------------------------------------------------ ###### `outdated/0` Lists all the packs that are installed but outdated using default options. **Compilation flags:** `static` **Mode and number of proofs:** `outdated` - `one` **See also:** outdated/1 ------------------------------------------------------------------------ ###### `orphaned/2` Lists all the packs that are installed but whose registry is no longer defined. **Compilation flags:** `static` **Template:** `orphaned(Registry,Pack)` **Mode and number of proofs:** `orphaned(?atom,?atom)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `orphaned/0` Lists all the packs that are installed but whose registry is no longer defined. **Compilation flags:** `static` **Mode and number of proofs:** `orphaned` - `one` ------------------------------------------------------------------------ ###### `versions/3` Returns a list of all available pack versions. Fails if the pack is unknown. **Compilation flags:** `static` **Template:** `versions(Registry,Pack,Versions)` **Mode and number of proofs:** `versions(+atom,+atom,-list)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `describe/2` Describes a registered pack, including installed version if applicable. Fails if the pack is unknown. **Compilation flags:** `static` **Template:** `describe(Registry,Pack)` **Mode and number of proofs:** `describe(+atom,+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `describe/1` Describes a registered pack, including installed version if applicable. Fails if the pack is unknown. **Compilation flags:** `static` **Template:** `describe(Pack)` **Mode and number of proofs:** `describe(+atom)` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `pack_metadata/4` Enumerates by backtracking resolved metadata for installed packs. **Compilation flags:** `static` **Template:** `pack_metadata(Registry,Pack,Version,Metadata)` **Mode and number of proofs:** `pack_metadata(?atom,?atom,?compound,?compound)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` `Metadata` is neither a variable nor a compound term: `type_error(compound,Metadata)` **Remarks:** > - `Metadata`: Resolved metadata term for the selected installed pack version. > > - Resolved fields: The metadata term includes both version-independent pack metadata and version-specific metadata selected from the installed version. > > - Absent optional metadata: Missing optional metadata is normalized to `none` instead of causing failure. > > - Metadata term: Metadata is returned using the term `metadata(Name,`` ``Description,`` ``License,`` ``Home,`` ``SourceURL,`` ``Checksum,`` ``Dependencies,`` ``Portability,`` ``Directory,`` ``Pinned,`` ``Installed,`` ``Loaded)`. **See also:** pack_property/4 pack_object/3 loaded_pack/3 ------------------------------------------------------------------------ ###### `pack_property/4` Enumerates by backtracking resolved properties for installed pack versions. **Compilation flags:** `static` **Template:** `pack_property(Registry,Pack,Version,Property)` **Mode and number of proofs:** `pack_property(?atom,?atom,?compound,?compound)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` `Property` is neither a variable nor a compound term: `type_error(compound,Property)` **Remarks:** > - `Property`: A resolved property term for the selected installed pack version. > > - Supported properties: Supported properties are `name(Name)`, `description(Description)`, `license(License)`, `home(Home)`, `source_url(URL)`, `checksum(Checksum)`, `dependencies(Dependencies)`, `portability(Portability)`, `directory(Directory)`, `pinned(Boolean)`, `installed(Boolean)`, and `loaded(Boolean)`. > > - Absent optional metadata: Missing optional metadata is normalized to `none`. **See also:** pack_metadata/4 pack_object/3 ------------------------------------------------------------------------ ###### `pack_object/3` Enumerates by backtracking pack specification objects for defined registry and pack pairs. **Compilation flags:** `static` **Template:** `pack_object(Registry,Pack,PackObject)` **Mode and number of proofs:** `pack_object(?atom,?atom,?atom)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `PackObject` is neither a variable nor an atom: `type_error(atom,PackObject)` **Remarks:** > - `PackObject`: Identifier of the object implementing the `pack_protocol` for the given registry and pack. > > - Intended use: This predicate is a low-level bridge for advanced tools and should not be required by most consumers when `pack_metadata/4` or `pack_property/4` is sufficient. **See also:** pack_metadata/4 pack_property/4 ------------------------------------------------------------------------ ###### `loaded_pack/3` Enumerates by backtracking all installed packs that contributed loaded files to the current session. **Compilation flags:** `static` **Template:** `loaded_pack(Registry,Pack,Version)` **Mode and number of proofs:** `loaded_pack(?atom,?atom,?compound)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` **Remarks:** > - Loaded pack: A pack is considered loaded iff at least one currently loaded file belongs to its installation directory. > > - `Version`: Installed version of the loaded pack. **See also:** loaded_pack_file/4 pack_metadata/4 installed/3 ------------------------------------------------------------------------ ###### `loaded_pack_file/4` Enumerates by backtracking loaded files that belong to installed packs in the current session. **Compilation flags:** `static` **Template:** `loaded_pack_file(Registry,Pack,Version,File)` **Mode and number of proofs:** `loaded_pack_file(?atom,?atom,?compound,?atom)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` `File` is neither a variable nor an atom: `type_error(atom,File)` **Remarks:** > - `File`: Absolute path of a currently loaded file belonging to the selected installed pack. > > - Intended use: This predicate supports diagnostics, tests, and the definition of `loaded_pack/3`. **See also:** loaded_pack/3 ------------------------------------------------------------------------ ###### `search/1` Searches packs whose name or description includes the search term (case sensitive). **Compilation flags:** `static` **Template:** `search(Term)` **Mode and number of proofs:** `search(+atom)` - `one` **Exceptions:** `Term` is a variable: `instantiation_error` `Term` is neither a variable nor an atom: `type_error(atom,Term)` ------------------------------------------------------------------------ ###### `pack_dependency/6` Enumerates by backtracking resolved direct pack-to-pack dependencies for installed pack versions. **Compilation flags:** `static` **Template:** `pack_dependency(Registry,Pack,Version,DependencyRegistry,DependencyPack,DependencyVersion)` **Mode and number of proofs:** `pack_dependency(?atom,?atom,?compound,?atom,?atom,?compound)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` `DependencyRegistry` is neither a variable nor an atom: `type_error(atom,DependencyRegistry)` `DependencyPack` is neither a variable nor an atom: `type_error(atom,DependencyPack)` `DependencyVersion` is neither a variable nor a compound term: `type_error(compound,DependencyVersion)` **Remarks:** > - Resolved dependency: Dependencies are resolved against the current installed packs using the same version comparison semantics used by the tool installation logic. > > - Supported dependency forms: Version ranges, alternatives, and conjunctions are resolved using the canonical packs dependency semantics. > > - Non-pack dependencies: Dependencies on Logtalk, Prolog backends, and operating systems are ignored by this predicate and therefore do not produce results. **See also:** loaded_pack_dependency/6 pack_metadata/4 loaded_pack/3 ------------------------------------------------------------------------ ###### `loaded_pack_dependency/6` Enumerates by backtracking resolved direct pack-to-pack dependencies where both the source pack and the dependency pack contributed loaded files to the current session. **Compilation flags:** `static` **Template:** `loaded_pack_dependency(Registry,Pack,Version,DependencyRegistry,DependencyPack,DependencyVersion)` **Mode and number of proofs:** `loaded_pack_dependency(?atom,?atom,?compound,?atom,?atom,?compound)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is neither a variable nor a compound term: `type_error(compound,Version)` `DependencyRegistry` is neither a variable nor an atom: `type_error(atom,DependencyRegistry)` `DependencyPack` is neither a variable nor an atom: `type_error(atom,DependencyPack)` `DependencyVersion` is neither a variable nor a compound term: `type_error(compound,DependencyVersion)` **Remarks:** > - Loaded dependency edge: This predicate is the loaded-pack counterpart of `pack_dependency/6` and only succeeds when both endpoints are currently loaded. > > - Intended use: This predicate is especially useful for tools that need to describe relationships between the installed packs that contributed code to the current session. **See also:** pack_dependency/6 loaded_pack/3 ------------------------------------------------------------------------ ###### `install/4` Installs a new pack using the specified options. Fails if the pack is unknown or already installed but not using `update(true)` or `force(true)` options. Fails also if the pack version is unknown. **Compilation flags:** `static` **Template:** `install(Registry,Pack,Version,Options)` **Mode and number of proofs:** `install(+atom,+atom,++compound,++list(compound))` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is a variable: `instantiation_error` `Version` is neither a variable nor a valid version: `type_error(pack_version,Version)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `update(Boolean)` option: Update pack if already installed. Default is `false`. Overrides the `force/1` option. > > - `force(Boolean)` option: Force pack re-installation if already installed. Default is `false`. > > - `compatible(Boolean)` option: Restrict installation to compatible packs. Default is `true`. > > - `clean(Boolean)` option: Clean pack archive after installation. Default is `false`. > > - `verbose(Boolean)` option: Verbose installing steps. Default is `false`. > > - `checksum(Boolean)` option: Verify pack archive checksum. Default is `true`. > > - `checksig(Boolean)` option: Verify pack archive signature. Default is `false`. > > - `git(Atom)` option: Extra command-line options. Default is `''`. > > - `downloader(Atom)` option: Downloader utility. Either `curl` or `wget`. Default is `curl`. > > - `curl(Atom)` option: Extra command-line options. Default is `''`. > > - `wget(Atom)` option: Extra command-line options. Default is `''`. > > - `gpg(Atom)` option: Extra command-line options. Default is `''`. > > - `tar(Atom)` option: Extra command-line options. Default is `''`. ------------------------------------------------------------------------ ###### `install/3` Installs the specified version of a pack from the given registry using default options. Fails if the pack is already installed or unknown. Fails also if the pack version is unknown. **Compilation flags:** `static` **Template:** `install(Registry,Pack,Version)` **Mode and number of proofs:** `install(+atom,+atom,?compound)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is a variable: `instantiation_error` `Version` is neither a variable nor a valid version: `type_error(pack_version,Version)` **See also:** install/4 ------------------------------------------------------------------------ ###### `install/2` Installs the latest version of a pack from the given registry using default options. Fails if the pack is already installed or unknown. **Compilation flags:** `static` **Template:** `install(Registry,Pack)` **Mode and number of proofs:** `install(+atom,+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` **See also:** install/3 ------------------------------------------------------------------------ ###### `install/1` Installs a pack (if its name is unique among all registries) using default options. Fails if the pack is already installed or unknown. Fails also if the pack is available from multiple registries. **Compilation flags:** `static` **Template:** `install(Pack)` **Mode and number of proofs:** `install(+atom)` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is not an atom: `type_error(atom,Pack)` **See also:** install/2 ------------------------------------------------------------------------ ###### `update/3` Updates an outdated pack to the specified version using the specified options. Fails if the pack or the pack version is unknown or if the pack is not installed. Fails also if the pack is orphaned or pinned and not using a `force(true)` option. **Compilation flags:** `static` **Template:** `update(Pack,Version,Options)` **Mode and number of proofs:** `update(+atom,++callable,++list(callable))` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Version` is a variable: `instantiation_error` `Version` is neither a variable nor a valid version: `type_error(pack_version,Version)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `install(Boolean)` option: Install pack latest version if not already installed. Default is `false`. > > - `force(Boolean)` option: Force update if the pack is pinned or breaks installed packs. Default is `false`. > > - `compatible(Boolean)` option: Restrict updating to compatible packs. Default is `true`. > > - `status(Status)` option: Specify allowed pack status. Default is `[stable,rc,beta,alpha]`. Set to `all` to also allow `experimental` and `deprecated`. > > - `clean(Boolean)` option: Clean pack archive after updating. Default is `false`. > > - `verbose(Boolean)` option: Verbose updating steps. Default is `false`. > > - `checksum(Boolean)` option: Verify pack archive checksum. Default is `true`. > > - `checksig(Boolean)` option: Verify pack archive signature. Default is `false`. > > - `git(Atom)` option: Extra command-line options. Default is `''`. > > - `downloader(Atom)` option: Downloader utility. Either `curl` or `wget`. Default is `curl`. > > - `curl(Atom)` option: Extra command-line options. Default is `''`. > > - `wget(Atom)` option: Extra command-line options. Default is `''`. > > - `gpg(Atom)` option: Extra command-line options. Default is `''`. > > - `tar(Atom)` option: Extra command-line options. Default is `''`. ------------------------------------------------------------------------ ###### `update/2` Updates an outdated pack to its latest version using the specified options. Fails if the pack is orphaned, unknown, or not installed. Fails also if the pack is pinned and not using a `force(true)` option. **Compilation flags:** `static` **Template:** `update(Pack,Options)` **Mode and number of proofs:** `update(+atom,++list(callable))` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `install(Boolean)` option: Install pack latest version if not already installed. Default is `false`. > > - `force(Boolean)` option: Force update if the pack is pinned or breaks installed packs. Default is `false`. > > - `compatible(Boolean)` option: Restrict updating to compatible packs. Default is `true`. > > - `status(Status)` option: Specify allowed pack update status. Default is `[stable,rc,beta,alpha]`. Set to `all` to also allow `experimental` and `deprecated`. > > - `clean(Boolean)` option: Clean pack archive after updating. Default is `false`. > > - `verbose(Boolean)` option: Verbose updating steps. Default is `false`. > > - `checksum(Boolean)` option: Verify pack archive checksum. Default is `true`. > > - `checksig(Boolean)` option: Verify pack archive signature. Default is `false`. > > - `git(Atom)` option: Extra command-line options. Default is `''`. > > - `downloader(Atom)` option: Downloader utility. Either `curl` or `wget`. Default is `curl`. > > - `curl(Atom)` option: Extra command-line options. Default is `''`. > > - `wget(Atom)` option: Extra command-line options. Default is `''`. > > - `gpg(Atom)` option: Extra command-line options. Default is `''`. > > - `tar(Atom)` option: Extra command-line options. Default is `''`. ------------------------------------------------------------------------ ###### `update/1` Updates an outdated pack to its latest version using default options. Fails if the pack is pinned, orphaned, not installed, unknown, or breaks installed packs. **Compilation flags:** `static` **Template:** `update(Pack)` **Mode and number of proofs:** `update(+atom)` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` **See also:** update/2 update/3 ------------------------------------------------------------------------ ###### `update/0` Updates all outdated packs (that are not pinned) using default options. **Compilation flags:** `static` **Mode and number of proofs:** `update` - `zero_or_one` ------------------------------------------------------------------------ ###### `uninstall/2` Uninstalls a pack using the specified options. Fails if the pack is unknown or not installed. Fails also if the pack is pinned or have dependents and not using a `force(true)` option. **Compilation flags:** `static` **Template:** `uninstall(Pack,Options)` **Mode and number of proofs:** `uninstall(+atom,++list(compound))` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `force(Boolean)` option: Force deletion if the pack is pinned. Default is `false`. > > - `clean(Boolean)` option: Clean pack archive after deleting. Default is `false`. > > - `verbose(Boolean)` option: Verbose uninstalling steps. Default is `false`. ------------------------------------------------------------------------ ###### `uninstall/1` Uninstalls a pack using default options. Fails if the pack is pinned, have dependents, not installed, or unknown. **Compilation flags:** `static` **Template:** `uninstall(Pack)` **Mode and number of proofs:** `uninstall(+atom)` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` **See also:** uninstall/2 ------------------------------------------------------------------------ ###### `uninstall/0` Uninstalls all packs using the `force(true)` option. **Compilation flags:** `static` **Mode and number of proofs:** `uninstall` - `zero_or_one` ------------------------------------------------------------------------ ###### `clean/2` Cleans all pack archives. Fails if the the pack is unknown. **Compilation flags:** `static` **Template:** `clean(Registry,Pack)` **Mode and number of proofs:** `clean(+atom,+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `clean/1` Cleans all pack archives. Fails if the pack is unknown. **Compilation flags:** `static` **Template:** `clean(Pack)` **Mode and number of proofs:** `clean(+atom)` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` **See also:** clean/2 ------------------------------------------------------------------------ ###### `clean/0` Cleans all archives for all packs. **Compilation flags:** `static` **Mode and number of proofs:** `clean` - `one` ------------------------------------------------------------------------ ###### `save/2` Saves a list of all installed packs and registries plus pinning status to a file using the given options. **Compilation flags:** `static` **Template:** `save(File,Options)` **Mode and number of proofs:** `save(+atom,++list(compound))` - `one_or_error` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an existing file but cannot be written: `permission_error(open,source_sink,File)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `lock(Boolean)` option: Save lock extension facts (lockfile version, git registry commits, and pack integrity hashes) in addition to the standard requirements facts. Default is `false`. > > - `save(What)` option: Save registries without installed packs when `What` is `all` and skip them when `What` is `installed`. Default is `installed`. ------------------------------------------------------------------------ ###### `save/1` Saves a list of all installed packs and their registries plus pinning status to a file using default options. **Compilation flags:** `static` **Template:** `save(File)` **Mode and number of proofs:** `save(+atom)` - `one_or_error` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an existing file but cannot be written: `permission_error(open,source_sink,File)` **See also:** save/2 ------------------------------------------------------------------------ ###### `restore/2` Restores a list of registries and packs plus their pinning status from a file using the given options. Fails if restoring is not possible. **Compilation flags:** `static` **Template:** `restore(File,Options)` **Mode and number of proofs:** `restore(+atom,++list(compound))` - `zero_or_one_or_error` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be read: `permission_error(open,source_sink,File)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `lock(Boolean)` option: Require lock extension facts and enforce strict restoring (exact versions, git registry commits, and pack integrity hashes). Default is `false`. > > - `force(Boolean)` option: Force restoring if a registry is already defined or a pack is already installed. Default is `true`. > > - `compatible(Boolean)` option: Restrict installation to compatible packs. Default is `true`. > > - `clean(Boolean)` option: Clean registry and pack archives after restoring. Default is `false`. > > - `verbose(Boolean)` option: Verbose restoring steps. Default is `false`. > > - `checksum(Boolean)` option: Verify pack archive checksums. Default is `true`. > > - `checksig(Boolean)` option: Verify pack archive signatures. Default is `false`. > > - `git(Atom)` option: Extra command-line options. Default is `''`. > > - `downloader(Atom)` option: Downloader utility. Either `curl` or `wget`. Default is `curl`. > > - `curl(Atom)` option: Extra command-line options. Default is `''`. > > - `wget(Atom)` option: Extra command-line options. Default is `''`. > > - `gpg(Atom)` option: Extra command-line options. Default is `''`. > > - `tar(Atom)` option: Extra command-line options. Default is `''`. ------------------------------------------------------------------------ ###### `restore/1` Restores a list of registries and packs plus their pinning status from a file using default options. Fails if restoring is not possible. **Compilation flags:** `static` **Template:** `restore(File)` **Mode and number of proofs:** `restore(+atom)` - `zero_or_one_or_error` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be read: `permission_error(open,source_sink,File)` **See also:** restore/2 ------------------------------------------------------------------------ ###### `dependents/3` Returns a list of all installed packs that depend on the given pack from the given registry. Fails if the pack is unknown. **Compilation flags:** `static` **Template:** `dependents(Registry,Pack,Dependents)` **Mode and number of proofs:** `dependents(+atom,+atom,-list(atom))` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `dependents/2` Prints a list of all installed packs that depend on the given pack from the given registry. Fails if the pack is unknown. **Compilation flags:** `static` **Template:** `dependents(Registry,Pack)` **Mode and number of proofs:** `dependents(+atom,+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `dependents/1` Prints a list of all installed packs that depend on the given pack if unique from all defined registries. Fails if the pack is unknown or available from multiple registries. **Compilation flags:** `static` **Template:** `dependents(Pack)` **Mode and number of proofs:** `dependents(+atom)` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `lint/2` Checks the pack specification. Fails if the pack is unknown or if linting detects errors. **Compilation flags:** `static` **Template:** `lint(Registry,Pack)` **Mode and number of proofs:** `lint(+atom,+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `lint/1` Checks the pack specification. Fails if the pack is unknown, or available from multiple registries, or if linting detects errors. **Compilation flags:** `static` **Template:** `lint(Pack)` **Mode and number of proofs:** `lint(+atom)` - `zero_or_one` **Exceptions:** `Pack` is a variable: `instantiation_error` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `lint/0` Checks all pack specifications. **Compilation flags:** `static` **Mode and number of proofs:** `lint` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `packs_common` Common predicates for the packs tool objects. **Availability:** `logtalk_load(packs(loader))` **Author:** Paulo Moura **Version:** 0:33:0 **Date:** 2025-01-23 **Compilation flags:** `static` **Provides:** type::type/1 type::check/2 **Uses:** list logtalk os type user **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `setup/0` - `reset/0` - `verify_commands_availability/0` - `help/0` - `pin/1` - `pin/0` - `unpin/1` - `unpin/0` - `pinned/1` - `directory/2` - `directory/1` - `readme/2` - `readme/1` - `logtalk_packs/1` - `logtalk_packs/0` - `prefix/1` - `prefix/0` - Protected predicates - `readme_file_path/2` - `print_readme_file_path/1` - `command/2` - `load_registry/1` - `sha256sum_command/1` - `tar_command/1` - `supported_archive/1` - `supported_url_archive/1` - `decode_url_spaces/2` - Private predicates - Operators ##### Public predicates ###### `setup/0` Ensures that registries and packs directory structure exists. Preserves any defined registries and installed packs. **Compilation flags:** `static` **Mode and number of proofs:** `setup` - `one` ------------------------------------------------------------------------ ###### `reset/0` Resets registries and packs directory structure. Deletes any defined registries and installed packs. **Compilation flags:** `static` **Mode and number of proofs:** `reset` - `one` ------------------------------------------------------------------------ ###### `verify_commands_availability/0` Verifies required shell commands availability. Fails printing an error message if a command is missing. **Compilation flags:** `static` **Mode and number of proofs:** `verify_commands_availability` - `zero_or_one` ------------------------------------------------------------------------ ###### `help/0` Provides help about the main predicates. **Compilation flags:** `static` **Mode and number of proofs:** `help` - `one` ------------------------------------------------------------------------ ###### `pin/1` Pins a resource (pack or registry) preventing it from being updated, uninstalled, or deleted. Fails if the resource is not found. **Compilation flags:** `static` **Template:** `pin(Resource)` **Mode and number of proofs:** `pin(+atom)` - `zero_or_one` **Exceptions:** `Resource` is a variable: `instantiation_error` `Resource` is neither a variable nor an atom: `type_error(atom,Resource)` ------------------------------------------------------------------------ ###### `pin/0` Pins all resource (packs or registries) preventing them from being updated, uninstalled, or deleted. Note that resources added after calling this predicate will not be pinned. **Compilation flags:** `static` **Mode and number of proofs:** `pin` - `one` ------------------------------------------------------------------------ ###### `unpin/1` Unpins a resource (pack or registry), allowing it to be updated, uninstalled, or deleted. Fails if the resource is not found. **Compilation flags:** `static` **Template:** `unpin(Resource)` **Mode and number of proofs:** `unpin(+atom)` - `zero_or_one` **Exceptions:** `Resource` is a variable: `instantiation_error` `Resource` is neither a variable nor an atom: `type_error(atom,Resource)` ------------------------------------------------------------------------ ###### `unpin/0` Unpins all resources (packs or registries), allowing them to be updated, uninstalled, or deleted. **Compilation flags:** `static` **Mode and number of proofs:** `unpin` - `one` ------------------------------------------------------------------------ ###### `pinned/1` True iff the resource (pack or registry) is defined or installed and if it is pinned. **Compilation flags:** `static` **Template:** `pinned(Resource)` **Mode and number of proofs:** `pinned(+atom)` - `zero_or_one` **Exceptions:** `Resource` is a variable: `instantiation_error` `Resource` is neither a variable nor an atom: `type_error(atom,Resource)` ------------------------------------------------------------------------ ###### `directory/2` Enumerates by backtracking all packs or registries and respective installation or definition directories (using the internal backend format). **Compilation flags:** `static` **Template:** `directory(Resource,Directory)` **Mode and number of proofs:** `directory(?atom,?atom)` - `zero_or_more` **Exceptions:** `Resource` is neither a variable nor an atom: `type_error(atom,Resource)` `Directory` is neither a variable nor an atom: `type_error(atom,Directory)` ------------------------------------------------------------------------ ###### `directory/1` Prints the directory where the registry or the pack is installed (using the native operating-system format). **Compilation flags:** `static` **Template:** `directory(Resource)` **Mode and number of proofs:** `directory(+atom)` - `zero_or_one` **Exceptions:** `Resource` is a variable: `instantiation_error` `Resource` is neither a variable nor an atom: `type_error(atom,Resource)` ------------------------------------------------------------------------ ###### `readme/2` Returns the path to the resource (pack or registry) readme file (using the internal backend format). Fails if the resource is not defined or installed or if no readme file is found for it. **Compilation flags:** `static` **Template:** `readme(Resource,ReadMeFile)` **Mode and number of proofs:** `readme(+atom,-atom)` - `zero_or_one` **Exceptions:** `Resource` is a variable: `instantiation_error` `Resource` is neither a variable nor an atom: `type_error(atom,Resource)` `ReadMeFile` is neither a variable nor an atom: `type_error(atom,ReadMeFile)` ------------------------------------------------------------------------ ###### `readme/1` Prints the path to the resource (pack or registry) readme file (using the native operating-system format). Fails if the resource is not defined or installed or if no readme file is found for it. **Compilation flags:** `static` **Template:** `readme(Resource)` **Mode and number of proofs:** `readme(+atom)` - `zero_or_one` **Exceptions:** `Resource` is a variable: `instantiation_error` `Resource` is neither a variable nor an atom: `type_error(atom,Resource)` ------------------------------------------------------------------------ ###### `logtalk_packs/1` Returns the directory prefix (using the internal backend format) where the registries, packs, and archives are installed. **Compilation flags:** `static` **Template:** `logtalk_packs(LogtalkPacks)` **Mode and number of proofs:** `logtalk_packs(-atom)` - `one` **Exceptions:** `LogtalkPacks` is neither a variable nor an atom: `type_error(atom,LogtalkPacks)` ------------------------------------------------------------------------ ###### `logtalk_packs/0` Prints the directory prefix (using the native operating-system format) where the registries, packs, and archives are installed. **Compilation flags:** `static` **Mode and number of proofs:** `logtalk_packs` - `one` ------------------------------------------------------------------------ ###### `prefix/1` Returns the directory prefix (using the internal backend format) where the registries or packs are installed. **Compilation flags:** `static` **Template:** `prefix(Prefix)` **Mode and number of proofs:** `prefix(-atom)` - `one` **Exceptions:** `Prefix` is neither a variable nor an atom: `type_error(atom,Prefix)` ------------------------------------------------------------------------ ###### `prefix/0` Prints the directory prefix (using the native operating-system format) where the registries or packs are installed. **Compilation flags:** `static` **Mode and number of proofs:** `prefix` - `one` ------------------------------------------------------------------------ ##### Protected predicates ###### `readme_file_path/2` Returns the absolute path for the given directory readme file if it exists. **Compilation flags:** `static` **Template:** `readme_file_path(Directory,ReadMeFile)` **Mode and number of proofs:** `readme_file_path(+atom,-atom)` - `zero_or_one` **Remarks:** > - Valid file names: Case variations of `README` and `NOTES` with or without a `.md` or `.txt` extension. The recommended file name is `README.md`. ------------------------------------------------------------------------ ###### `print_readme_file_path/1` Prints the absolute path for the given directory readme file if it exists. Succeeds otherwise. **Compilation flags:** `static` **Template:** `print_readme_file_path(Directory)` **Mode and number of proofs:** `print_readme_file_path(+atom)` - `one` ------------------------------------------------------------------------ ###### `command/2` Executes a shell command. Prints an error message and fails if the command fails. **Compilation flags:** `static` **Template:** `command(Command,FailureMessage)` **Mode and number of proofs:** `command(+atom,@nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `load_registry/1` Loads all registry files from the given directory. **Compilation flags:** `static` **Template:** `load_registry(Directory)` **Mode and number of proofs:** `load_registry(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sha256sum_command/1` Returns the name of the sha256sum command to be used on POSIX systems. Fails if neither gsha256sum or sha256sum commands are found. **Compilation flags:** `static` **Template:** `sha256sum_command(Command)` **Mode and number of proofs:** `sha256sum_command(-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `tar_command/1` Returns the name of the tar command to be used depending on the operating-system. **Compilation flags:** `static` **Template:** `tar_command(Command)` **Mode and number of proofs:** `tar_command(-atom)` - `one` ------------------------------------------------------------------------ ###### `supported_archive/1` True iff the archive format is supported. **Compilation flags:** `static` **Template:** `supported_archive(Extension)` **Mode and number of proofs:** `supported_archive(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `supported_url_archive/1` True iff the URL archive is supported. **Compilation flags:** `static` **Template:** `supported_url_archive(URL)` **Mode and number of proofs:** `supported_url_archive(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `decode_url_spaces/2` Decodes encoded spaces (%20) in URLs to spaces. **Compilation flags:** `static` **Template:** `decode_url_spaces(URL,Decoded)` **Mode and number of proofs:** `decode_url_spaces(+atom,-atom)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `packs_messages` Packs default message translations. **Availability:** `logtalk_load(packs(loader))` **Author:** Paulo Moura **Version:** 0:42:0 **Date:** 2026-03-02 **Compilation flags:** `static` **Provides:** logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `packs_specs_hook` Hook object for filtering registry and pack specification file contents. **Availability:** `logtalk_load(packs(loader))` **Author:** Paulo Moura **Version:** 0:13:0 **Date:** 2022-06-28 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Uses:** character logtalk **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `registries` Registry handling predicates. **Availability:** `logtalk_load(packs(loader))` **Author:** Paulo Moura **Version:** 0:65:0 **Date:** 2026-05-19 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` packs_common `public` options **Uses:** list logtalk os type user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  help/0  logtalk_packs/0  logtalk_packs/1  option/2  option/3  pin/0  pin/1  pinned/1  prefix/0  prefix/1  readme/1  readme/2  reset/0  setup/0  unpin/0  unpin/1  valid_option/1  valid_options/1  verify_commands_availability/0 - Public predicates - `list/0` - `describe/1` - `defined/4` - `add/3` - `add/2` - `add/1` - `update/2` - `update/1` - `update/0` - `delete/2` - `delete/1` - `delete/0` - `clean/1` - `clean/0` - `provides/2` - `lint/1` - `lint/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `list/0` Prints a list of all defined registries, including how defined (`git`, `archive`, or `directory`) and if they are pinned. **Compilation flags:** `static` **Mode and number of proofs:** `list` - `one` ------------------------------------------------------------------------ ###### `describe/1` Prints all registry entries. **Compilation flags:** `static` **Template:** `describe(Registry)` **Mode and number of proofs:** `describe(+atom)` - `one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` ------------------------------------------------------------------------ ###### `defined/4` Enumerates by backtracking all defined registries, their definition URL, how they are defined (`git`, `archive`, or `directory`), and if they are pinned. **Compilation flags:** `static` **Template:** `defined(Registry,URL,HowDefined,Pinned)` **Mode and number of proofs:** `defined(?atom,?atom,?atom,?boolean)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `URL` is neither a variable nor an atom: `type_error(atom,URL)` `HowDefined` is neither a variable nor an atom: `type_error(atom,HowDefined)` `Pinned` is neither a variable nor a boolean: `type_error(boolean,Pinned)` ------------------------------------------------------------------------ ###### `add/3` Adds a new registry using the given options. Fails if the registry cannot be added or if it is already defined but not using `update(true)` or `force(true)` options. A `file://` URL can be used for a local directory or archive. **Compilation flags:** `static` **Template:** `add(Registry,URL,Options)` **Mode and number of proofs:** `add(+atom,+atom,++list(compound))` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `URL` is a variable: `instantiation_error` `URL` is neither a variable nor an atom: `type_error(atom,URL)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - Registry name: Must be the URL basename when using a git URL or a local directory URL. Must also be the declared registry name in the registry specification object. > > - HTTPS URLs: Must end with either a `.git` extension or an archive extension. > > - `commit(Hash)` option: When present, checkout the registry git repository at the specified commit hash after cloning. > > - `update(Boolean)` option: Update registry if already defined. Default is `false`. Overrides the `force/1` option. > > - `force(Boolean)` option: Force registry re-installation if already defined by first deleting the previous installation. Default is `false`. > > - `clean(Boolean)` option: Clean registry archive after updating. Default is `false`. > > - `verbose(Boolean)` option: Verbose adding steps. Default is `false`. > > - `downloader(Atom)` option: Downloader utility. Either `curl` or `wget`. Default is `curl`. > > - `curl(Atom)` option: Extra command-line options. Default is `''`. > > - `wget(Atom)` option: Extra command-line options. Default is `''`. > > - `gpg(Atom)` option: Extra command-line options. Default is `''`. > > - `tar(Atom)` option: Extra command-line options. Default is `''`. ------------------------------------------------------------------------ ###### `add/2` Adds a new registry using default options. Fails if the registry cannot be added or if it is already defined. HTTPS URLs must end with either a `.git` extension or an archive extension. A `file://` URL can be used for a local directory or archive. **Compilation flags:** `static` **Template:** `add(Registry,URL)` **Mode and number of proofs:** `add(+atom,+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `URL` is a variable: `instantiation_error` `URL` is neither a variable nor an atom: `type_error(atom,URL)` **Remarks:** > - Registry name: Must be the URL basename when using a git URL or a local directory URL. Must also be the declared registry name in the registry specification object. **See also:** add/3 ------------------------------------------------------------------------ ###### `add/1` Adds a new registry using default options. Fails if the registry cannot be added or if it is already defined. HTTPS URLs must end with a `.git` extension or an archive extension. A `file://` URL can be used for a local directory or archive. **Compilation flags:** `static` **Template:** `add(URL)` **Mode and number of proofs:** `add(+atom)` - `zero_or_one` **Exceptions:** `URL` is a variable: `instantiation_error` `URL` is neither a variable nor an atom: `type_error(atom,URL)` **Remarks:** > - Registry name: Taken from the URL basename. **See also:** add/2 ------------------------------------------------------------------------ ###### `update/2` Updates a defined registry using the specified options. Fails if the registry is not defined. **Compilation flags:** `static` **Template:** `update(Registry,Options)` **Mode and number of proofs:** `update(+atom,++list(compound))` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `commit(Hash)` option: When present, checkout the registry git repository at the specified commit hash after updating. > > - `force(Boolean)` option: Force update if the registry is pinned. Default is `false`. > > - `clean(Boolean)` option: Clean registry archive after updating. Default is `false`. > > - `verbose(Boolean)` option: Verbose updating steps. Default is `false`. > > - `downloader(Atom)` option: Downloader utility. Either `curl` or `wget`. Default is `curl`. > > - `curl(Atom)` option: Extra command-line options. Default is `''`. > > - `wget(Atom)` option: Extra command-line options. Default is `''`. > > - `gpg(Atom)` option: Extra command-line options. Default is `''`. > > - `tar(Atom)` option: Extra command-line options. Default is `''`. ------------------------------------------------------------------------ ###### `update/1` Updates a defined registry using default options. Fails if the registry is not defined. **Compilation flags:** `static` **Template:** `update(Registry)` **Mode and number of proofs:** `update(+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` **See also:** update/2 ------------------------------------------------------------------------ ###### `update/0` Updates all defined registries using default options. **Compilation flags:** `static` **Mode and number of proofs:** `update` - `zero_or_one` ------------------------------------------------------------------------ ###### `delete/2` Deletes a registry using the specified options (if not pinned). **Compilation flags:** `static` **Template:** `delete(Registry,Options)` **Mode and number of proofs:** `delete(+atom,++list(compound))` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` **Remarks:** > - `force(Boolean)` option: Force deletion if the registry is pinned or there are installed registry packs. Default is `false`. > > - `clean(Boolean)` option: Clean registry archive after deleting. Default is `false`. > > - `verbose(Boolean)` option: Verbose deleting steps. Default is `false`. > > - `downloader(Atom)` option: Downloader utility. Either `curl` or `wget`. Default is `curl`. > > - `curl(Atom)` option: Extra command-line options. Default is `''`. > > - `wget(Atom)` option: Extra command-line options. Default is `''`. > > - `gpg(Atom)` option: Extra command-line options. Default is `''`. > > - `tar(Atom)` option: Extra command-line options. Default is `''`. ------------------------------------------------------------------------ ###### `delete/1` Deletes a registry using default options. **Compilation flags:** `static` **Template:** `delete(Registry)` **Mode and number of proofs:** `delete(+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` **See also:** delete/2 ------------------------------------------------------------------------ ###### `delete/0` Deletes all registries using the `force(true)` option. **Compilation flags:** `static` **Mode and number of proofs:** `delete` - `zero_or_one` ------------------------------------------------------------------------ ###### `clean/1` Cleans all registry archives. Fails if the registry is not defined. **Compilation flags:** `static` **Template:** `clean(Registry)` **Mode and number of proofs:** `clean(+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` ------------------------------------------------------------------------ ###### `clean/0` Cleans all archives for all registries. **Compilation flags:** `static` **Mode and number of proofs:** `clean` - `one` ------------------------------------------------------------------------ ###### `provides/2` Enumerates by backtracking all packs provided by a registry. **Compilation flags:** `static` **Template:** `provides(Registry,Pack)` **Mode and number of proofs:** `provides(?atom,?atom)` - `zero_or_more` **Exceptions:** `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` `Pack` is neither a variable nor an atom: `type_error(atom,Pack)` ------------------------------------------------------------------------ ###### `lint/1` Checks the registry specification. Fails if the registry is not defined or if linting detects errors. **Compilation flags:** `static` **Template:** `lint(Registry)` **Mode and number of proofs:** `lint(+atom)` - `zero_or_one` **Exceptions:** `Registry` is a variable: `instantiation_error` `Registry` is neither a variable nor an atom: `type_error(atom,Registry)` ------------------------------------------------------------------------ ###### `lint/0` Checks all registry specifications. **Compilation flags:** `static` **Mode and number of proofs:** `lint` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `registry_loader_hook` Hook object for filtering registry loader file contents. **Availability:** `logtalk_load(packs(loader))` **Author:** Paulo Moura **Version:** 0:13:0 **Date:** 2022-11-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Uses:** character logtalk **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `registry_protocol` Registry specification protocol. Objects implementing this protocol should be named after the pack with a `_registry` suffix and saved in a file with the same name as the object. **Availability:** `logtalk_load(packs(loader))` **Author:** Paulo Moura **Version:** 0:12:0 **Date:** 2022-06-28 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `name/1` - `description/1` - `home/1` - `clone/1` - `archive/1` - `note/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `name/1` Registry name. Preferably a valid unquoted atom. **Compilation flags:** `static` **Template:** `name(Name)` **Mode and number of proofs:** `name(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `description/1` Registry one line description. **Compilation flags:** `static` **Template:** `description(Description)` **Mode and number of proofs:** `description(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `home/1` Registry home HTTPS or file URL. **Compilation flags:** `static` **Template:** `home(Home)` **Mode and number of proofs:** `home(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `clone/1` Registry git clone HTTPS URL (must end with the `.git` extension). Git repos should have the same name as the registry. **Compilation flags:** `static` **Template:** `clone(URL)` **Mode and number of proofs:** `clone(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `archive/1` Registry archive download HTTPS URL. **Compilation flags:** `static` **Template:** `archive(URL)` **Mode and number of proofs:** `archive(?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `note/2` Table of notes per action. **Compilation flags:** `static` **Template:** `note(Action,Note)` **Mode and number of proofs:** `note(?atom,-atom)` - `zero_or_more` **Remarks:** > - Action: Possible values are `add`, `update`, and `delete`. When unbound, the note apply to all actions. > > - Note: Note to print when performing an action on a registry. ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### partitions") **object** #### `partitions` Implementation of set partition operations over lists. **Availability:** `logtalk_load(partitions(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-12 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` partitions_protocol **Uses:** fast_random(Algorithm) integer list natural **Remarks:** (none) **Inherited public predicates:**  count_distinct_partitions/2  count_distinct_partitions/3  count_partitions/2  count_partitions/3  distinct_partition/2  distinct_partition/3  distinct_partition/4  distinct_partition_index/3  distinct_partition_index/4  distinct_partition_index/5  distinct_partitions/2  distinct_partitions/3  distinct_partitions/4  next_partition/3  next_partition/4  nth_distinct_partition/3  nth_distinct_partition/4  nth_distinct_partition/5  nth_partition/3  nth_partition/4  nth_partition/5  partition/2  partition/3  partition/4  partition_index/3  partition_index/4  partition_index/5  partitions/2  partitions/3  partitions/4  previous_partition/3  previous_partition/4  random_distinct_partition/2  random_distinct_partition/3  random_partition/2  random_partition/3  sample_distinct_partitions/3  sample_distinct_partitions/4  sample_partitions/3  sample_partitions/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `partitions_protocol` Protocol for set partition operations over lists. **Availability:** `logtalk_load(partitions(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-12 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `partitions/2` - `partition/2` - `partitions/3` - `partition/3` - `partitions/4` - `partition/4` - `distinct_partitions/2` - `distinct_partition/2` - `distinct_partitions/3` - `distinct_partition/3` - `distinct_partitions/4` - `distinct_partition/4` - `count_partitions/2` - `nth_partition/3` - `nth_partition/4` - `nth_partition/5` - `partition_index/3` - `partition_index/4` - `partition_index/5` - `count_partitions/3` - `count_distinct_partitions/2` - `nth_distinct_partition/3` - `nth_distinct_partition/4` - `nth_distinct_partition/5` - `distinct_partition_index/3` - `distinct_partition_index/4` - `distinct_partition_index/5` - `count_distinct_partitions/3` - `random_partition/2` - `random_partition/3` - `sample_partitions/3` - `sample_partitions/4` - `random_distinct_partition/2` - `random_distinct_partition/3` - `sample_distinct_partitions/3` - `sample_distinct_partitions/4` - `next_partition/3` - `next_partition/4` - `previous_partition/3` - `previous_partition/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `partitions/2` Generates all set partitions of a list using default order. Partitions are represented as lists of non-empty blocks. The empty list has one partition, represented by the empty list of blocks. **Compilation flags:** `static` **Template:** `partitions(List,Partitions)` **Mode and number of proofs:** `partitions(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `partition/2` True iff the second argument is a set partition of a list using default order. **Compilation flags:** `static` **Template:** `partition(List,Partition)` **Mode and number of proofs:** `partition(+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `partitions/3` Generates either all set partitions with the given order (when the second argument is `default` or `lexicographic`) or all set partitions with an exact number of blocks using default order (when the first argument is an integer). **Compilation flags:** `static` **Template:** `partitions(ListOrK,OrderOrList,Partitions)` **Mode and number of proofs:** `partitions(+list,+atom,-list)` - `one` `partitions(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `partition/3` True iff the third argument is a set partition generated either in the given order or with the given exact number of blocks using default order. **Compilation flags:** `static` **Template:** `partition(ListOrK,OrderOrList,Partition)` **Mode and number of proofs:** `partition(+list,+atom,-list)` - `one_or_more` `partition(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `partitions/4` Generates all set partitions with an exact number of blocks and the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `partitions(K,List,Order,Partitions)` **Mode and number of proofs:** `partitions(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `partition/4` True iff the fourth argument is a set partition with an exact number of blocks and the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `partition(K,List,Order,Partition)` **Mode and number of proofs:** `partition(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_partitions/2` Generates all distinct set partitions of a list (deduplicating equal-valued partitions after canonicalizing block order) using default order. **Compilation flags:** `static` **Template:** `distinct_partitions(List,Partitions)` **Mode and number of proofs:** `distinct_partitions(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_partition/2` True iff the second argument is a distinct set partition of a list using default order. **Compilation flags:** `static` **Template:** `distinct_partition(List,Partition)` **Mode and number of proofs:** `distinct_partition(+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_partitions/3` Generates either all distinct set partitions with the given order (when the second argument is `default` or `lexicographic`) or all distinct set partitions with an exact number of blocks using default order (when the first argument is an integer). **Compilation flags:** `static` **Template:** `distinct_partitions(ListOrK,OrderOrList,Partitions)` **Mode and number of proofs:** `distinct_partitions(+list,+atom,-list)` - `one` `distinct_partitions(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_partition/3` True iff the third argument is a distinct set partition generated either in the given order or with the given exact number of blocks using default order. **Compilation flags:** `static` **Template:** `distinct_partition(ListOrK,OrderOrList,Partition)` **Mode and number of proofs:** `distinct_partition(+list,+atom,-list)` - `one_or_more` `distinct_partition(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_partitions/4` Generates all distinct set partitions with an exact number of blocks and the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_partitions(K,List,Order,Partitions)` **Mode and number of proofs:** `distinct_partitions(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_partition/4` True iff the fourth argument is a distinct set partition with an exact number of blocks and the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_partition(K,List,Order,Partition)` **Mode and number of proofs:** `distinct_partition(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `count_partitions/2` Counts the number of set partitions of a list. **Compilation flags:** `static` **Template:** `count_partitions(List,Count)` **Mode and number of proofs:** `count_partitions(+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `nth_partition/3` Returns the set partition at a given zero-based index using default order. **Compilation flags:** `static` **Template:** `nth_partition(List,Index,Partition)` **Mode and number of proofs:** `nth_partition(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_partition/4` Returns either the set partition at a given zero-based index in the given order (when the second argument is `default` or `lexicographic`) or the set partition with an exact number of blocks at a given zero-based index using default order (when the first argument is an integer). **Compilation flags:** `static` **Template:** `nth_partition(ListOrK,OrderOrList,Index,Partition)` **Mode and number of proofs:** `nth_partition(+list,+atom,+integer,-list)` - `zero_or_one` `nth_partition(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_partition/5` Returns the set partition with an exact number of blocks at a given zero-based index in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `nth_partition(K,List,Order,Index,Partition)` **Mode and number of proofs:** `nth_partition(+integer,+list,+atom,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `partition_index/3` Returns the zero-based index of a set partition using default order. **Compilation flags:** `static` **Template:** `partition_index(List,Partition,Index)` **Mode and number of proofs:** `partition_index(+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `partition_index/4` Returns either the zero-based index of a set partition in the given order (when the second argument is `default` or `lexicographic`) or the zero-based index of a set partition with an exact number of blocks using default order (when the first argument is an integer). **Compilation flags:** `static` **Template:** `partition_index(ListOrK,OrderOrList,Partition,Index)` **Mode and number of proofs:** `partition_index(+list,+atom,+list,-integer)` - `zero_or_one` `partition_index(+integer,+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `partition_index/5` Returns the zero-based index of a set partition with an exact number of blocks in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `partition_index(K,List,Order,Partition,Index)` **Mode and number of proofs:** `partition_index(+integer,+list,+atom,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `count_partitions/3` Counts the number of set partitions of a list with an exact number of blocks. **Compilation flags:** `static` **Template:** `count_partitions(K,List,Count)` **Mode and number of proofs:** `count_partitions(+integer,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `count_distinct_partitions/2` Counts the number of distinct set partitions of a list (deduplicating equal-valued partitions). **Compilation flags:** `static` **Template:** `count_distinct_partitions(List,Count)` **Mode and number of proofs:** `count_distinct_partitions(+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `nth_distinct_partition/3` Returns the distinct set partition at a given zero-based index using default order. **Compilation flags:** `static` **Template:** `nth_distinct_partition(List,Index,Partition)` **Mode and number of proofs:** `nth_distinct_partition(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_distinct_partition/4` Returns either the distinct set partition at a given zero-based index in the given order (when the second argument is `default` or `lexicographic`) or the distinct set partition with an exact number of blocks at a given zero-based index using default order (when the first argument is an integer). **Compilation flags:** `static` **Template:** `nth_distinct_partition(ListOrK,OrderOrList,Index,Partition)` **Mode and number of proofs:** `nth_distinct_partition(+list,+atom,+integer,-list)` - `zero_or_one` `nth_distinct_partition(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_distinct_partition/5` Returns the distinct set partition with an exact number of blocks at a given zero-based index in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `nth_distinct_partition(K,List,Order,Index,Partition)` **Mode and number of proofs:** `nth_distinct_partition(+integer,+list,+atom,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_partition_index/3` Returns the zero-based index of a distinct set partition using default order. **Compilation flags:** `static` **Template:** `distinct_partition_index(List,Partition,Index)` **Mode and number of proofs:** `distinct_partition_index(+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_partition_index/4` Returns either the zero-based index of a distinct set partition in the given order (when the second argument is `default` or `lexicographic`) or the zero-based index of a distinct set partition with an exact number of blocks using default order (when the first argument is an integer). **Compilation flags:** `static` **Template:** `distinct_partition_index(ListOrK,OrderOrList,Partition,Index)` **Mode and number of proofs:** `distinct_partition_index(+list,+atom,+list,-integer)` - `zero_or_one` `distinct_partition_index(+integer,+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_partition_index/5` Returns the zero-based index of a distinct set partition with an exact number of blocks in the given order: `default` or `lexicographic`. **Compilation flags:** `static` **Template:** `distinct_partition_index(K,List,Order,Partition,Index)` **Mode and number of proofs:** `distinct_partition_index(+integer,+list,+atom,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `count_distinct_partitions/3` Counts the number of distinct set partitions of a list with an exact number of blocks. **Compilation flags:** `static` **Template:** `count_distinct_partitions(K,List,Count)` **Mode and number of proofs:** `count_distinct_partitions(+integer,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_partition/2` Returns a random set partition of a list. **Compilation flags:** `static` **Template:** `random_partition(List,Partition)` **Mode and number of proofs:** `random_partition(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `random_partition/3` Returns a random set partition of a list with an exact number of blocks. **Compilation flags:** `static` **Template:** `random_partition(K,List,Partition)` **Mode and number of proofs:** `random_partition(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_partitions/3` Returns SampleCount random set partitions of a list, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_partitions(List,SampleCount,Samples)` **Mode and number of proofs:** `sample_partitions(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_partitions/4` Returns SampleCount random set partitions of a list with an exact number of blocks, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_partitions(K,List,SampleCount,Samples)` **Mode and number of proofs:** `sample_partitions(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_distinct_partition/2` Returns a random distinct set partition of a list (deduplicating equal-valued partitions). **Compilation flags:** `static` **Template:** `random_distinct_partition(List,Partition)` **Mode and number of proofs:** `random_distinct_partition(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `random_distinct_partition/3` Returns a random distinct set partition of a list with an exact number of blocks (deduplicating equal-valued partitions). **Compilation flags:** `static` **Template:** `random_distinct_partition(K,List,Partition)` **Mode and number of proofs:** `random_distinct_partition(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_distinct_partitions/3` Returns SampleCount random distinct set partitions of a list, sampled with replacement after deduplicating equal-valued partitions. **Compilation flags:** `static` **Template:** `sample_distinct_partitions(List,SampleCount,Samples)` **Mode and number of proofs:** `sample_distinct_partitions(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sample_distinct_partitions/4` Returns SampleCount random distinct set partitions of a list with an exact number of blocks, sampled with replacement after deduplicating equal-valued partitions. **Compilation flags:** `static` **Template:** `sample_distinct_partitions(K,List,SampleCount,Samples)` **Mode and number of proofs:** `sample_distinct_partitions(+integer,+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next_partition/3` Returns the next distinct set partition value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `next_partition(List,Partition,Next)` **Mode and number of proofs:** `next_partition(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next_partition/4` Returns the next distinct set partition value with an exact number of blocks in lexicographic order induced by the second argument. **Compilation flags:** `static` **Template:** `next_partition(K,List,Partition,Next)` **Mode and number of proofs:** `next_partition(+integer,+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_partition/3` Returns the previous distinct set partition value in lexicographic order induced by the first argument. **Compilation flags:** `static` **Template:** `previous_partition(List,Partition,Previous)` **Mode and number of proofs:** `previous_partition(+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_partition/4` Returns the previous distinct set partition value with an exact number of blocks in lexicographic order induced by the second argument. **Compilation flags:** `static` **Template:** `previous_partition(K,List,Partition,Previous)` **Mode and number of proofs:** `previous_partition(+integer,+list,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### pattern_mining_protocols") **category** #### `pattern_miner_common` Shared predicates for pattern miner diagnostics, defaults, option handling, and export helpers. **Availability:** `logtalk_load(pattern_mining_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-07 **Compilation flags:** `static` **Implements:** `public` pattern_miner_protocol **Extends:** `public` options **Uses:** format list type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - `pattern_miner_diagnostics_data/2` - `pattern_miner_diagnostics/6` - `pattern_miner_export_template/4` - `valid_pattern_miner_metadata/5` - `check_item_domain/1` - `effective_support_count/3` - `effective_maximum_pattern_length/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `pattern_miner_diagnostics_data/2` Hook predicate that importing pattern miner implementations must define in order to expose diagnostics metadata. **Compilation flags:** `static` **Template:** `pattern_miner_diagnostics_data(PatternMiner,Diagnostics)` **Mode and number of proofs:** `pattern_miner_diagnostics_data(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `pattern_miner_diagnostics/6` Builds a standard diagnostics list from generic pattern miner metadata and algorithm-specific diagnostics terms. **Compilation flags:** `static` **Template:** `pattern_miner_diagnostics(Model,ItemDomain,Patterns,Options,SpecificDiagnostics,Diagnostics)` **Mode and number of proofs:** `pattern_miner_diagnostics(+atom,+list(atom),+list(compound),+list(compound),+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `pattern_miner_export_template/4` Hook predicate that importing pattern miner implementations must define in order to expose the exported pattern miner template for a given functor. **Compilation flags:** `static` **Template:** `pattern_miner_export_template(Dataset,PatternMiner,Functor,Template)` **Mode and number of proofs:** `pattern_miner_export_template(+object_identifier,+compound,+atom,-callable)` - `one` ------------------------------------------------------------------------ ###### `valid_pattern_miner_metadata/5` True when the diagnostics list matches the generic pattern miner metadata implied by the model, item domain, mined patterns, and effective options. **Compilation flags:** `static` **Template:** `valid_pattern_miner_metadata(Model,ItemDomain,Patterns,Options,Diagnostics)` **Mode and number of proofs:** `valid_pattern_miner_metadata(+atom,+list(atom),+list(compound),+list(compound),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `check_item_domain/1` Validates that the declared item domain is canonical and contains only atoms. **Compilation flags:** `static` **Template:** `check_item_domain(ItemDomain)` **Mode and number of proofs:** `check_item_domain(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `effective_support_count/3` Computes the effective minimum support count from the effective options and the dataset size. **Compilation flags:** `static` **Template:** `effective_support_count(DatasetSize,Options,SupportCount)` **Mode and number of proofs:** `effective_support_count(+integer,+list(compound),-integer)` - `one` ------------------------------------------------------------------------ ###### `effective_maximum_pattern_length/3` Computes the effective maximum pattern length from the effective options and the dataset maximum pattern length. **Compilation flags:** `static` **Template:** `effective_maximum_pattern_length(DatasetMaximumPatternLength,Options,MaximumPatternLength)` **Mode and number of proofs:** `effective_maximum_pattern_length(+integer,+list(compound),-integer)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `pattern_miner_protocol` Protocol for machine learning pattern-mining algorithms. **Availability:** `logtalk_load(pattern_mining_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-30 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `mine/3` - `mine/2` - `diagnostics/2` - `diagnostic/2` - `pattern_miner_options/2` - `check_pattern_miner/1` - `valid_pattern_miner/1` - `export_to_clauses/4` - `export_to_file/4` - `print_pattern_miner/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `mine/3` Mines a pattern miner result from the given dataset object using the specified options. **Compilation flags:** `static` **Template:** `mine(Dataset,PatternMiner,Options)` **Mode and number of proofs:** `mine(+object_identifier,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `mine/2` Mines a pattern miner result from the given dataset object using default options. **Compilation flags:** `static` **Template:** `mine(Dataset,PatternMiner)` **Mode and number of proofs:** `mine(+object_identifier,-compound)` - `one` ------------------------------------------------------------------------ ###### `diagnostics/2` Returns diagnostics and metadata associated with a mined pattern miner in a representation-independent way. **Compilation flags:** `static` **Template:** `diagnostics(PatternMiner,Diagnostics)` **Mode and number of proofs:** `diagnostics(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostic/2` Tests or enumerates individual diagnostics metadata terms for a mined pattern miner. **Compilation flags:** `static` **Template:** `diagnostic(PatternMiner,Diagnostic)` **Mode and number of proofs:** `diagnostic(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `pattern_miner_options/2` Returns the effective mining options recorded in a mined pattern miner diagnostics list. **Compilation flags:** `static` **Template:** `pattern_miner_options(PatternMiner,Options)` **Mode and number of proofs:** `pattern_miner_options(+compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `check_pattern_miner/1` Checks that the argument is a structurally valid mined pattern miner term for the receiving pattern miner implementation, throwing an exception on invalid input when applicable. **Compilation flags:** `static` **Template:** `check_pattern_miner(PatternMiner)` **Mode and number of proofs:** `check_pattern_miner(@compound)` - `one_or_error` **Exceptions:** `PatternMiner` is a variable: `instantiation_error` `PatternMiner` is neither a variable nor a valid pattern miner: `domain_error(pattern_miner,PatternMiner)` ------------------------------------------------------------------------ ###### `valid_pattern_miner/1` True when `check_pattern_miner/1` succeeds for the argument without throwing an exception. **Compilation flags:** `static` **Template:** `valid_pattern_miner(PatternMiner)` **Mode and number of proofs:** `valid_pattern_miner(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `export_to_clauses/4` Converts a pattern miner result into a list of predicate clauses. `Functor` is the functor for the generated predicate clauses. **Compilation flags:** `static` **Template:** `export_to_clauses(Dataset,PatternMiner,Functor,Clauses)` **Mode and number of proofs:** `export_to_clauses(+object_identifier,+compound,+callable,-list(clause))` - `one` ------------------------------------------------------------------------ ###### `export_to_file/4` Exports a pattern miner result to a file. `Functor` is the functor for the generated predicate clauses. **Compilation flags:** `static` **Template:** `export_to_file(Dataset,PatternMiner,Functor,File)` **Mode and number of proofs:** `export_to_file(+object_identifier,+compound,+callable,+atom)` - `one` ------------------------------------------------------------------------ ###### `print_pattern_miner/1` Prints a pattern miner result to the current output stream in a human-readable format. **Compilation flags:** `static` **Template:** `print_pattern_miner(PatternMiner)` **Mode and number of proofs:** `print_pattern_miner(+compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also transaction_dataset_protocol, sequence_dataset_protocol ### pca_projection") **object** #### `pca_projection` Principal Component Analysis reducer for continuous datasets using a portable power-iteration eigensolver. **Availability:** `logtalk_load(pca_projection(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** format linear_algebra list pairs type **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also lda_projection, random_projection ### pddl_parser") **object** #### `pddl` Simple parser of PDDL 3.0 files. **Availability:** `logtalk_load(pddl_parser(loader))` **Author:** Robert Sasak, Charles University in Prague. Adapted to Logtalk by Paulo Moura. **Version:** 1:2:2 **Date:** 2024-03-14 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` read_file **Uses:** user **Remarks:** (none) **Inherited public predicates:**  read_file/2 - Public predicates - `parse_domain/3` - `parse_domain/2` - `parse_problem/2` - `parse_problem/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse_domain/3` Parses a PDDL 3.0 domain file, returning a compound term representing its contents and rest of the file. Useful when domain and problem are in one file. **Compilation flags:** `static` **Template:** `parse_domain(File,Output,RestOfFile)` **Mode and number of proofs:** `parse_domain(+atom,-compound,-list(atom))` - `one` ------------------------------------------------------------------------ ###### `parse_domain/2` Parses a PDDL 3.0 domain file, returning a compound term representing its contents. **Compilation flags:** `static` **Template:** `parse_domain(File,Output)` **Mode and number of proofs:** `parse_domain(+atom,-compound)` - `one` ------------------------------------------------------------------------ ###### `parse_problem/2` Parses a PDDL 3.0 problem file, returning a compound term representing its contents. **Compilation flags:** `static` **Template:** `parse_problem(File,Output)` **Mode and number of proofs:** `parse_problem(+atom,-compound)` - `one` ------------------------------------------------------------------------ ###### `parse_problem/3` Parses a PDDL 3.0 problem file, returning a compound term representing its contents and rest of the file. Useful when domain and problem are in one file. **Compilation flags:** `static` **Template:** `parse_problem(File,Output,RestOfFile)` **Mode and number of proofs:** `parse_problem(+atom,-compound,-list(atom))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `read_file` Utility predicates for parsing a file as a list of atoms. **Availability:** `logtalk_load(pddl_parser(loader))` **Author:** Robert Sasak, Charles University in Prague. Adapted to Logtalk by Paulo Moura. **Version:** 1:0:0 **Date:** 2011-08-04 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `read_file/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `read_file/2` Reads a file character by character, parsing it into a list of atoms. **Compilation flags:** `static` **Template:** `read_file(File,List)` **Mode and number of proofs:** `read_file(+atom,-list(atom))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### permutations") **object** #### `permutations` Implementation of permutations operations over lists. **Availability:** `logtalk_load(permutations(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-12 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` permutations_protocol **Uses:** fast_random(Algorithm) list natural **Remarks:** (none) **Inherited public predicates:**  count_distinct_permutations/2  count_permutations/2  distinct_permutation/2  distinct_permutation/3  distinct_permutation_index/3  distinct_permutations/2  distinct_permutations/3  k_permutation/3  k_permutation/4  k_permutations/3  k_permutations/4  next_permutation/2  nth_distinct_permutation/3  nth_permutation/3  nth_permutation/4  permutation/2  permutation/3  permutation_index/3  permutation_index/4  permutations/2  permutations/3  previous_permutation/2  random_distinct_permutation/2  random_permutation/2  sample_distinct_permutations/3  sample_permutations/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `permutations_protocol` Protocol for permutations operations over lists. **Availability:** `logtalk_load(permutations(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-12 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `permutations/2` - `permutation/2` - `permutations/3` - `permutation/3` - `distinct_permutations/2` - `distinct_permutation/2` - `distinct_permutations/3` - `distinct_permutation/3` - `k_permutations/3` - `k_permutation/3` - `k_permutations/4` - `k_permutation/4` - `next_permutation/2` - `previous_permutation/2` - `nth_permutation/3` - `nth_permutation/4` - `permutation_index/3` - `permutation_index/4` - `count_permutations/2` - `count_distinct_permutations/2` - `nth_distinct_permutation/3` - `distinct_permutation_index/3` - `random_permutation/2` - `sample_permutations/3` - `random_distinct_permutation/2` - `sample_distinct_permutations/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `permutations/2` Generates all permutations of a list using default order. **Compilation flags:** `static` **Template:** `permutations(List,Permutations)` **Mode and number of proofs:** `permutations(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `permutation/2` True iff the second argument is a permutation of the first argument using default order. **Compilation flags:** `static` **Template:** `permutation(List,Permutation)` **Mode and number of proofs:** `permutation(+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `permutations/3` Generates all permutations with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `permutations(List,Order,Permutations)` **Mode and number of proofs:** `permutations(+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `permutation/3` True iff the third argument is a permutation with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `permutation(List,Order,Permutation)` **Mode and number of proofs:** `permutation(+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_permutations/2` Generates all distinct permutations of a list (deduplicating repeated values in the input list) using default order. **Compilation flags:** `static` **Template:** `distinct_permutations(List,Permutations)` **Mode and number of proofs:** `distinct_permutations(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_permutation/2` True iff the second argument is a distinct permutation of the first argument using default order. **Compilation flags:** `static` **Template:** `distinct_permutation(List,Permutation)` **Mode and number of proofs:** `distinct_permutation(+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `distinct_permutations/3` Generates all distinct permutations with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `distinct_permutations(List,Order,Permutations)` **Mode and number of proofs:** `distinct_permutations(+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `distinct_permutation/3` True iff the third argument is a distinct permutation with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `distinct_permutation(List,Order,Permutation)` **Mode and number of proofs:** `distinct_permutation(+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `k_permutations/3` Generates all K-permutations (ordered selections) of a list using default order. **Compilation flags:** `static` **Template:** `k_permutations(K,List,Permutations)` **Mode and number of proofs:** `k_permutations(+integer,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `k_permutation/3` True iff the third argument is a K-permutation (ordered selection) of a list using default order. **Compilation flags:** `static` **Template:** `k_permutation(K,List,Permutation)` **Mode and number of proofs:** `k_permutation(+integer,+list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `k_permutations/4` Generates all K-permutations with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `k_permutations(K,List,Order,Permutations)` **Mode and number of proofs:** `k_permutations(+integer,+list,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `k_permutation/4` True iff the fourth argument is a K-permutation with the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `k_permutation(K,List,Order,Permutation)` **Mode and number of proofs:** `k_permutation(+integer,+list,+atom,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `next_permutation/2` Returns the next permutation value in lexicographic order. **Compilation flags:** `static` **Template:** `next_permutation(Permutation,Next)` **Mode and number of proofs:** `next_permutation(+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous_permutation/2` Returns the previous permutation value in lexicographic order. **Compilation flags:** `static` **Template:** `previous_permutation(Permutation,Previous)` **Mode and number of proofs:** `previous_permutation(+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_permutation/3` Returns the permutation at a given zero-based index using default order. **Compilation flags:** `static` **Template:** `nth_permutation(List,Index,Permutation)` **Mode and number of proofs:** `nth_permutation(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nth_permutation/4` Returns the permutation at a given zero-based index in the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `nth_permutation(List,Order,Index,Permutation)` **Mode and number of proofs:** `nth_permutation(+list,+atom,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `permutation_index/3` Returns the zero-based index of a permutation using default order. **Compilation flags:** `static` **Template:** `permutation_index(List,Permutation,Index)` **Mode and number of proofs:** `permutation_index(+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `permutation_index/4` Returns the zero-based index of a permutation in the given order: `default`, `lexicographic`, or `shortlex`. **Compilation flags:** `static` **Template:** `permutation_index(List,Order,Permutation,Index)` **Mode and number of proofs:** `permutation_index(+list,+atom,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `count_permutations/2` Counts the number of permutations of a list. **Compilation flags:** `static` **Template:** `count_permutations(List,Count)` **Mode and number of proofs:** `count_permutations(+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `count_distinct_permutations/2` Counts the number of distinct permutations of a list (deduplicating equal-valued permutations). **Compilation flags:** `static` **Template:** `count_distinct_permutations(List,Count)` **Mode and number of proofs:** `count_distinct_permutations(+list,-integer)` - `one` ------------------------------------------------------------------------ ###### `nth_distinct_permutation/3` Returns the distinct permutation at a given zero-based index in default generation order. **Compilation flags:** `static` **Template:** `nth_distinct_permutation(List,Index,Permutation)` **Mode and number of proofs:** `nth_distinct_permutation(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `distinct_permutation_index/3` Returns the zero-based index of a distinct permutation in default generation order. **Compilation flags:** `static` **Template:** `distinct_permutation_index(List,Permutation,Index)` **Mode and number of proofs:** `distinct_permutation_index(+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_permutation/2` Returns a random permutation of a list. **Compilation flags:** `static` **Template:** `random_permutation(List,Permutation)` **Mode and number of proofs:** `random_permutation(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `sample_permutations/3` Returns SampleCount random permutations of a list, sampled with replacement. **Compilation flags:** `static` **Template:** `sample_permutations(List,SampleCount,Samples)` **Mode and number of proofs:** `sample_permutations(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `random_distinct_permutation/2` Returns a random distinct permutation of a list (deduplicating equal-valued permutations). **Compilation flags:** `static` **Template:** `random_distinct_permutation(List,Permutation)` **Mode and number of proofs:** `random_distinct_permutation(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `sample_distinct_permutations/3` Returns SampleCount random distinct permutations of a list, sampled with replacement after deduplicating equal-valued permutations. **Compilation flags:** `static` **Template:** `sample_distinct_permutations(List,SampleCount,Samples)` **Mode and number of proofs:** `sample_distinct_permutations(+list,+integer,-list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### plackett_luce_last_ranker") **object** #### `plackett_luce_last_ranker` Tie-aware Plackett-Luce-last grouped-ranking ranker. Learns one positive preference strength parameter per item from a dataset object implementing the `ranking_dataset_protocol` protocol by fitting a last-choice Plackett-Luce model to grouped tie blocks, and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(plackett_luce_last_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` grouped_strength_ranker_common `public` score_ranker_common `public` plackett_luce_common **Uses:** avltree format list type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ranking_dataset_protocol, ranker_protocol, borda_ranker ### plackett_luce_ranker") **object** #### `plackett_luce_ranker` Tie-aware Plackett-Luce grouped-ranking ranker. Learns one positive preference strength parameter per item from a dataset object implementing the `ranking_dataset_protocol` protocol by fitting a top-choice Plackett-Luce model to grouped tie blocks, and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(plackett_luce_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` grouped_strength_ranker_common `public` score_ranker_common `public` plackett_luce_common **Uses:** avltree format list type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ranking_dataset_protocol, ranker_protocol, plackett_luce_last_ranker, borda_ranker ### pls_projection") **object** #### `pls_projection` Partial Least Squares projection for target-valued continuous datasets using deterministic PLS1 deflation. **Availability:** `logtalk_load(pls_projection(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** format linear_algebra list numberlist pairs population type **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also lda_projection, pca_projection ### ports_profiler") **object** #### `ports_profiler` Predicate execution box model port profiler. **Availability:** `logtalk_load(ports_profiler(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2024-05-18 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::debug_handler/1 logtalk::debug_handler/3 **Uses:** logtalk user **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `start/0` - `stop/0` - `data/0` - `data/1` - `data/2` - `reset/0` - `reset/1` - `port/5` - `clause_location/6` - `clause/5` - Protected predicates - Private predicates - `clause_location_/6` - `port_/5` - `clause_/5` - `entity_defines_/2` - Operators ##### Public predicates ###### `start/0` Activates the ports profiler for followup goals. **Compilation flags:** `static` **Mode and number of proofs:** `start` - `one` ------------------------------------------------------------------------ ###### `stop/0` Deactivates the ports profiler. **Compilation flags:** `static` **Mode and number of proofs:** `stop` - `one` ------------------------------------------------------------------------ ###### `data/0` Prints a table with all port profiling data. **Compilation flags:** `static` **Mode and number of proofs:** `data` - `one` ------------------------------------------------------------------------ ###### `data/1` Prints a table with all port profiling data for the specified entity. **Compilation flags:** `static` **Template:** `data(Entity)` **Mode and number of proofs:** `data(+entity_identifier)` - `one` ------------------------------------------------------------------------ ###### `data/2` Prints a table with all port profiling data for the specified entity predicate (or non-terminal). **Compilation flags:** `static` **Template:** `data(Entity,Predicate)` **Mode and number of proofs:** `data(+entity_identifier,+predicate_indicator)` - `one` `data(+entity_identifier,+non_terminal_indicator)` - `one` ------------------------------------------------------------------------ ###### `reset/0` Resets all port profiling data. **Compilation flags:** `static` **Mode and number of proofs:** `reset` - `one` ------------------------------------------------------------------------ ###### `reset/1` Resets all port profiling data for the specified entity. **Compilation flags:** `static` **Template:** `reset(Entity)` **Mode and number of proofs:** `reset(+entity_identifier)` - `one` ------------------------------------------------------------------------ ###### `port/5` Enumerates, by backtracking, all collected port profiling data. **Compilation flags:** `static` **Template:** `port(Port,Entity,Functor,Arity,Count)` **Mode and number of proofs:** `port(?atom,?entity_identifier,?atom,?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `clause_location/6` Enumerates, by backtracking, all collected profiled clause location data. **Compilation flags:** `static` **Template:** `clause_location(Entity,Functor,Arity,ClauseNumber,File,BeginLine)` **Mode and number of proofs:** `clause_location(?entity_identifier,?atom,?integer,?integer,?atom,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `clause/5` Enumerates, by backtracking, all collected clause profiling data. **Compilation flags:** `dynamic` **Template:** `clause(Entity,Functor,Arity,ClauseNumber,Count)` **Mode and number of proofs:** `clause(?entity_identifier,?atom,?integer,?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `clause_location_/6` Internal table of collected profiled clause location data. **Compilation flags:** `dynamic` **Template:** `clause_location_(Entity,Functor,Arity,ClauseNumber,File,BeginLine)` **Mode and number of proofs:** `clause_location_(?entity_identifier,?atom,?integer,?integer,?atom,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `port_/5` Internal table of collected port profiling data. **Compilation flags:** `dynamic` **Template:** `port_(Port,Entity,Functor,Arity,Count)` **Mode and number of proofs:** `port_(?atom,?entity_identifier,?atom,?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `clause_/5` Internal table of collected clause profiling data. **Compilation flags:** `dynamic` **Template:** `clause_(Entity,Functor,Arity,ClauseNumber,Count)` **Mode and number of proofs:** `clause_(?entity_identifier,?atom,?integer,?integer,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `entity_defines_/2` Internal cache for profiled predicates. **Compilation flags:** `dynamic` **Template:** `entity_defines_(Entity,Predicate)` **Mode and number of proofs:** `entity_defines_(?entity_identifier,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### prefix_span_pattern_miner") **object** #### `prefix_span_pattern_miner` PrefixSpan sequential pattern miner for sequence datasets using recursive projected databases. **Availability:** `logtalk_load(prefix_span_pattern_miner(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` sequential_pattern_mining_common **Uses:** avltree format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pattern_miner_protocol, sequence_dataset_protocol ### probabilistic_pca_projection") **object** #### `probabilistic_pca_projection` Probabilistic Principal Component Analysis reducer for continuous datasets using a portable covariance eigensolver. **Availability:** `logtalk_load(probabilistic_pca_projection(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** format linear_algebra list numberlist pairs type **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also kernel_pca_projection, pca_projection, truncated_svd_projection ### process") **object** #### `process` Portable process handling predicates. **Availability:** `logtalk_load(process(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-06-30 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Supported backend Prolog systems: ECLiPSe, GNU Prolog, SICStus Prolog, SWI-Prolog, Trealla Prolog, and XVM. > > - Option `type/1` limitation: This option is ignored on ECLiPSe, GNU Prolog, Trealla Prolog, and XVM. **Inherited public predicates:** (none) - Public predicates - `create/3` - `wait/2` - `kill/2` - `kill/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `create/3` Creates a new process from the given executable and list of arguments. Supported options are `process(Pid)`, `stdin(Stream)`, `stdout(Stream)`, `stderr(Stream)`, and `type(Type)`. **Compilation flags:** `static` **Template:** `create(Executable,Arguments,Options)` **Mode and number of proofs:** `create(+atom,+list(atom),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `wait/2` Waits for a process to terminate and retrieves its exit status. The value of `Status` depends on the backend. For a successfully terminated process, `Status` is either `0` or `exit(0)`. **Compilation flags:** `static` **Template:** `wait(Process,Status)` **Mode and number of proofs:** `wait(+process_or_pid,-integer_or_compound)` - `one` ------------------------------------------------------------------------ ###### `kill/2` Kills the given process with the specified signal (an integer or one of the following atoms: `sighup`, `sigint`, `sigkill`, or `sigterm`). **Compilation flags:** `static` **Template:** `kill(Process,Signal)` **Mode and number of proofs:** `kill(+process_or_pid,+atom_or_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `kill/1` Kills the given process using the default signal (`sigkill`). **Compilation flags:** `static` **Template:** `kill(Process)` **Mode and number of proofs:** `kill(+process_or_pid)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also os ### protobuf") **object** #### `protobuf` Google Protocol Buffers binary format parser and generator. **Availability:** `logtalk_load(protobuf(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-09 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** ieee_754(Precision,ByteOrder,NaNRepresentation) json(ObjectRepresentation,PairRepresentation,StringRepresentation) list reader **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `parse/3` - `generate/3` - `generate/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses Protocol Buffers binary data from the given source (`bytes(List)`, `stream(Stream)`, or `file(Path)`) returning a `Schema-Data` pair. When the schema is not present in the file, `Schema` is unified with `false`. **Compilation flags:** `static` **Template:** `parse(Source,Schema-Data)` **Mode and number of proofs:** `parse(++compound,--pair)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Protocol Buffers source term: `domain_error(protobuf_source,Source)` `Schema` is not a valid Protocol Buffers schema for the encoded message: `domain_error(protobuf_schema,Schema)` ------------------------------------------------------------------------ ###### `parse/3` Parses Protocol Buffers binary data from the given source using the provided schema, returning the decoded data. **Compilation flags:** `static` **Template:** `parse(Source,Schema,Data)` **Mode and number of proofs:** `parse(++compound,++term,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid Protocol Buffers source term: `domain_error(protobuf_source,Source)` `Schema` is not a valid Protocol Buffers schema for the encoded message: `domain_error(protobuf_schema,Schema)` ------------------------------------------------------------------------ ###### `generate/3` Generates Protocol Buffers binary data to the given sink (`bytes(List)`, `stream(Stream)`, or `file(Path)`) from the given schema and data. The schema is not included in the output. **Compilation flags:** `static` **Template:** `generate(Sink,Schema,Data)` **Mode and number of proofs:** `generate(++compound,++term,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Protocol Buffers sink term: `domain_error(protobuf_sink,Sink)` `Schema` is not a valid Protocol Buffers schema for `Data`: `domain_error(protobuf_schema,Schema)` ------------------------------------------------------------------------ ###### `generate/4` Generates Protocol Buffers binary data to the given sink from the given schema and data. When `IncludeSchema` is `true`, the schema is embedded in a wrapper message. **Compilation flags:** `static` **Template:** `generate(Sink,IncludeSchema,Schema,Data)` **Mode and number of proofs:** `generate(++compound,++boolean,++term,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid Protocol Buffers sink term: `domain_error(protobuf_sink,Sink)` `Schema` is not a valid Protocol Buffers schema for `Data`: `domain_error(protobuf_schema,Schema)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### qda_classifier") **object** #### `qda_classifier` Quadratic Discriminant Analysis classifier for continuous datasets using class-specific regularized covariance models. **Availability:** `logtalk_load(qda_classifier(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` classifier_common **Uses:** format linear_algebra list type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - `predict_scores/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `predict_scores/3` Predicts class discriminant scores for a new instance. **Compilation flags:** `static` **Template:** `predict_scores(Classifier,Instance,Scores)` **Mode and number of proofs:** `predict_scores(+compound,+list,-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, lda_classifier, nearest_centroid_classifier ### queues") **object** #### `queue` Queue predicates implemented using difference lists. **Availability:** `logtalk_load(queues(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2020-12-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` queuep **Extends:** `public` compound **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  append/3  as_list/2  check/1  depth/2  empty/1  ground/1  head/2  join/3  join_all/3  jump/3  jump_all/3  jump_all_block/3  length/2  map/2  map/3  new/1  numbervars/1  numbervars/3  occurs/2  serve/3  singletons/2  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `queuep` Queue protocol. **Availability:** `logtalk_load(queues(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2020-12-09 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `empty/1` - `head/2` - `join/3` - `join_all/3` - `jump/3` - `jump_all/3` - `jump_all_block/3` - `append/3` - `length/2` - `serve/3` - `as_list/2` - `map/2` - `map/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `empty/1` True if the queue is empty. **Compilation flags:** `static` **Template:** `empty(Queue)` **Mode and number of proofs:** `empty(@queue)` - `zero_or_one` ------------------------------------------------------------------------ ###### `head/2` Unifies `Head` with the first element of the queue. **Compilation flags:** `static` **Template:** `head(Queue,Head)` **Mode and number of proofs:** `head(+queue,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `join/3` Adds the new element at the end of the queue. **Compilation flags:** `static` **Template:** `join(Element,Queue,NewQueue)` **Mode and number of proofs:** `join(@term,+queue,-queue)` - `zero_or_one` ------------------------------------------------------------------------ ###### `join_all/3` Adds the new elements at the end of the queue. The elements are added in the same order that they appear in the list. **Compilation flags:** `static` **Template:** `join_all(List,Queue,NewQueue)` **Mode and number of proofs:** `join_all(+list,+queue,-queue)` - `zero_or_one` ------------------------------------------------------------------------ ###### `jump/3` Adds the new element at the front of the queue. **Compilation flags:** `static` **Template:** `jump(Element,Queue,NewQueue)` **Mode and number of proofs:** `jump(@term,+queue,-queue)` - `zero_or_one` ------------------------------------------------------------------------ ###### `jump_all/3` Adds the new elements at the front of the queue. The last element in the list will be at the front of the queue. **Compilation flags:** `static` **Template:** `jump_all(Elements,Queue,NewQueue)` **Mode and number of proofs:** `jump_all(+list,+queue,-queue)` - `zero_or_one` ------------------------------------------------------------------------ ###### `jump_all_block/3` Adds the new elements as a block at the front of the queue. The first element in the list will be at the front of the queue. **Compilation flags:** `static` **Template:** `jump_all_block(Elements,Queue,NewQueue)` **Mode and number of proofs:** `jump_all_block(+list,+queue,-queue)` - `zero_or_one` ------------------------------------------------------------------------ ###### `append/3` Appends two queues. The new queue will have the elements of the first queue followed by the elements of the second queue. **Compilation flags:** `static` **Template:** `append(Queue1,Queue2,NewQueue)` **Mode and number of proofs:** `append(+queue,+queue,-queue)` - `one` ------------------------------------------------------------------------ ###### `length/2` Queue length. **Compilation flags:** `static` **Template:** `length(Queue,Length)` **Mode and number of proofs:** `length(+heap,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `serve/3` Removes the first element of the queue for service. **Compilation flags:** `static` **Template:** `serve(Queue,Head,NewQueue)` **Mode and number of proofs:** `serve(+queue,?term,-queue)` - `zero_or_one` ------------------------------------------------------------------------ ###### `as_list/2` Converts a queue to a list. **Compilation flags:** `static` **Template:** `as_list(Queue,List)` **Mode and number of proofs:** `as_list(+queue,-list)` - `one` ------------------------------------------------------------------------ ###### `map/2` Applies a closure to all elements of a queue. **Compilation flags:** `static` **Template:** `map(Closure,Queue)` **Meta-predicate template:** `map(1,*)` **Mode and number of proofs:** `map(+callable,+queue)` - `zero_or_one` ------------------------------------------------------------------------ ###### `map/3` Applies a closure to all elements of a queue constructing a new queue. **Compilation flags:** `static` **Template:** `map(Closure,Queue,NewQueue)` **Meta-predicate template:** `map(2,*,*)` **Mode and number of proofs:** `map(+callable,+queue,?queue)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also queue ### random") **object** #### `backend_random` Random number generator predicates using the backend Prolog compiler built-in random generator. **Availability:** `logtalk_load(random(loader))` **Author:** Paulo Moura **Version:** 1:22:0 **Date:** 2026-02-11 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` pseudo_random_protocol `public` sampling_protocol **Uses:** list **Remarks:** > - Implementation: The backend Prolog compiler built-in random generator is only used for the basic `random/1`, `get_seed/1`, and `set_seed/1` predicates. > > - Portability: B-Prolog, CxProlog, ECLiPSe, JIProlog, Qu-Prolog, and Quintus Prolog do not provide implementations for the `get_seed/1` and `set_seed/1` predicates and calling these predicates simply succeed without performing any action. **Inherited public predicates:**  bernoulli/2  beta/3  between/3  binomial/3  chi_squared/2  circular_uniform_cartesian/3  circular_uniform_polar/3  dirichlet/2  enumerate/2  exponential/2  fisher/3  gamma/3  geometric/2  get_seed/1  gumbel/3  hypergeometric/4  logistic/3  lognormal/3  logseries/2  maybe/0  maybe/1  maybe/2  maybe_call/1  maybe_call/2  member/2  normal/3  permutation/2  poisson/2  power/2  random/1  random/3  randseq/4  randset/4  select/3  select/4  sequence/4  set/4  set_seed/1  standard_cauchy/3  standard_exponential/1  standard_gamma/2  standard_normal/1  standard_t/2  swap/2  swap_consecutive/2  triangular/4  uniform/1  uniform/3  von_mises/3  wald/3  weibull/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also random, fast_random **object** #### `fast_random` Portable random number generator predicates. Core predicates originally written by Richard O’Keefe. Based on algorithm AS 183 from Applied Statistics. **Availability:** `logtalk_load(random(loader))` **Author:** Paulo Moura **Version:** 3:0:0 **Date:** 2026-01-25 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` fast_random(as183) **Remarks:** > - Single random number generator: This object provides a faster version of the `random` library object but does not support being extended to define multiple random number generators. > > - Randomness: Loading this object always initializes the random generator seed to the same value, thus providing a pseudo random number generator. The `randomize/1` predicate can be used to initialize the seed with a random value. **Inherited public predicates:**  bernoulli/2  beta/3  between/3  binomial/3  chi_squared/2  circular_uniform_cartesian/3  circular_uniform_polar/3  dirichlet/2  enumerate/2  exponential/2  fisher/3  gamma/3  geometric/2  get_seed/1  gumbel/3  hypergeometric/4  logistic/3  lognormal/3  logseries/2  maybe/0  maybe/1  maybe/2  maybe_call/1  maybe_call/2  member/2  normal/3  permutation/2  poisson/2  power/2  random/1  random/3  randomize/1  randseq/4  randset/4  reset_seed/0  select/3  select/4  sequence/4  set/4  set_seed/1  standard_cauchy/3  standard_exponential/1  standard_gamma/2  standard_normal/1  standard_t/2  swap/2  swap_consecutive/2  triangular/4  uniform/1  uniform/3  von_mises/3  wald/3  weibull/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also fast_random, random, random(Algorithm), backend_random **object** #### `fast_random(Algorithm)` - `Algorithm` - Random number generator algorithm. One of `as183`, `splitmix64`, `xoshiro128pp`, `xoshiro128ss`, `xoshiro256pp`, `xoshiro256ss`, `well512a`. Fast portable random number generator predicates. **Availability:** `logtalk_load(random(loader))` **Author:** Paulo Moura **Version:** 3:0:0 **Date:** 2026-02-23 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` pseudo_random_protocol `public` sampling_protocol **Uses:** list **Remarks:** > - Single random number generator: This object provides a faster version of the `random` library object but does not support being extended to define multiple random number generators. > > - Randomness: Loading this object always initializes the random generator seed to the same value, thus providing a pseudo random number generator. The `randomize/1` predicate can be used to initialize the seed with a random value. > > - `as183`: Algorithm AS 183 from Applied Statistics. 32-bit PRNG with period 2^60. Not cryptographically secure. > > - `xoshiro128pp`: Xoshiro128++ random number generator. 32-bit state-of-the-art PRNG with period 2^128-1. Algorithm by David Blackman and Sebastiano Vigna. > > - `xoshiro128ss`: Xoshiro128\*\* random number generator. 32-bit PRNG with period 2^128-1. Algorithm by David Blackman and Sebastiano Vigna. > > - `xoshiro256pp`: Xoshiro256++ random number generator. 64-bit state-of-the-art PRNG with period 2^256-1. Algorithm by David Blackman and Sebastiano Vigna. > > - `xoshiro256ss`: Xoshiro256\*\* random number generator. 64-bit PRNG with period 2^256-1. Algorithm by David Blackman and Sebastiano Vigna. > > - `splitmix64`: SplitMix64 random number generator. 64-bit PRNG primarily used for seeding other generators. Algorithm by Guy L. Steele Jr. et al. > > - `well512a`: WELL512a 16x32-bit state-of-the-art PRNG with period 2^512-1. Algorithm by by François Panneton, Pierre L’Ecuyer, and Makoto Matsumoto. > > - Algorithms backend compatibility: The SplitMix64, Xoshiro256++, and Xoshiro256\*\* algorithms require support for unbound integer arithmetic. **Inherited public predicates:**  bernoulli/2  beta/3  between/3  binomial/3  chi_squared/2  circular_uniform_cartesian/3  circular_uniform_polar/3  dirichlet/2  enumerate/2  exponential/2  fisher/3  gamma/3  geometric/2  get_seed/1  gumbel/3  hypergeometric/4  logistic/3  lognormal/3  logseries/2  maybe/0  maybe/1  maybe/2  maybe_call/1  maybe_call/2  member/2  normal/3  permutation/2  poisson/2  power/2  random/1  random/3  randseq/4  randset/4  select/3  select/4  sequence/4  set/4  set_seed/1  standard_cauchy/3  standard_exponential/1  standard_gamma/2  standard_normal/1  standard_t/2  swap/2  swap_consecutive/2  triangular/4  uniform/1  uniform/3  von_mises/3  wald/3  weibull/3 - Public predicates - `reset_seed/0` - `randomize/1` - Protected predicates - Private predicates - `seed_/2` - Operators ##### Public predicates ###### `reset_seed/0` Resets the random generator seed to its default value. Use `get_seed/1` and `set_seed/1` instead if you need reproducibility. **Compilation flags:** `static,`` ``synchronized` **Mode and number of proofs:** `reset_seed` - `one` ------------------------------------------------------------------------ ###### `randomize/1` Randomizes the random generator using a positive integer to compute a new seed. Use of a large integer is recommended. In alternative, when using a small integer argument, discard the first dozen random values. **Compilation flags:** `static,`` ``synchronized` **Template:** `randomize(Seed)` **Mode and number of proofs:** `randomize(+positive_integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `seed_/2` Stores the current random generator seed values (a ground but otherwise opaque term). **Compilation flags:** `dynamic` **Template:** `seed_(Algorithm,Seed)` **Mode and number of proofs:** `seed_(+atom,-ground)` - `one` ------------------------------------------------------------------------ ##### Operators (none) See also fast_random, random(Algorithm), random, backend_random **protocol** #### `pseudo_random_protocol` Pseudo-random number generator protocol for seed handling predicates. These predicates are declared as synchronized when the library is compiled using a backend supporting threads. **Availability:** `logtalk_load(random(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2021-02-21 **Compilation flags:** `static` **Extends:** `public` random_protocol **Remarks:** (none) **Inherited public predicates:**  between/3  enumerate/2  maybe/0  maybe/1  maybe/2  maybe_call/1  maybe_call/2  member/2  permutation/2  random/1  random/3  randseq/4  randset/4  select/3  select/4  sequence/4  set/4  swap/2  swap_consecutive/2 - Public predicates - `get_seed/1` - `set_seed/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `get_seed/1` Gets the current random generator seed. Seed should be regarded as an opaque ground term. **Compilation flags:** `static,`` ``synchronized` **Template:** `get_seed(Seed)` **Mode and number of proofs:** `get_seed(-ground)` - `one` ------------------------------------------------------------------------ ###### `set_seed/1` Sets the random generator seed to a given value returned by calling the `get_seed/1` predicate. **Compilation flags:** `static,`` ``synchronized` **Template:** `set_seed(Seed)` **Mode and number of proofs:** `set_seed(+ground)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also random, backend_random, fast_random **object** #### `random` Portable random number generator predicates. Core predicates originally written by Richard O’Keefe. Based on algorithm AS 183 from Applied Statistics. **Availability:** `logtalk_load(random(loader))` **Author:** Paulo Moura **Version:** 3:0:0 **Date:** 2026-01-24 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` random(as183) **Remarks:** > - Multiple random number generators: To define multiple random number generators, simply extend this object. The derived objects must send to *self* the `reset_seed/0` message. > > - Randomness: Loading this object always initializes the random generator seed to the same value, thus providing a pseudo random number generator. The `randomize/1` predicate can be used to initialize the seed with a random value. **Inherited public predicates:**  bernoulli/2  beta/3  between/3  binomial/3  chi_squared/2  circular_uniform_cartesian/3  circular_uniform_polar/3  dirichlet/2  enumerate/2  exponential/2  fisher/3  gamma/3  geometric/2  get_seed/1  gumbel/3  hypergeometric/4  logistic/3  lognormal/3  logseries/2  maybe/0  maybe/1  maybe/2  maybe_call/1  maybe_call/2  member/2  normal/3  permutation/2  poisson/2  power/2  random/1  random/3  randomize/1  randseq/4  randset/4  reset_seed/0  select/3  select/4  sequence/4  set/4  set_seed/1  standard_cauchy/3  standard_exponential/1  standard_gamma/2  standard_normal/1  standard_t/2  swap/2  swap_consecutive/2  triangular/4  uniform/1  uniform/3  von_mises/3  wald/3  weibull/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also fast_random, backend_random **object** #### `random(Algorithm)` - `Algorithm` - Random number generator algorithm. One of `as183`, `splitmix64`, `xoshiro128pp`, `xoshiro128ss`, `xoshiro256pp`, `xoshiro256ss`, `well512a`. Portable random number generator predicates. **Availability:** `logtalk_load(random(loader))` **Author:** Paulo Moura **Version:** 3:0:0 **Date:** 2026-02-23 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` pseudo_random_protocol `public` sampling_protocol **Uses:** list **Remarks:** > - Multiple random number generators: To define multiple random number generators, simply extend this object. The derived objects must send to *self* the `reset_seed/0` message. > > - Randomness: Loading this object always initializes the random generator seed to the same value, thus providing a pseudo random number generator. The `randomize/1` predicate can be used to initialize the seed with a random value. > > - `as183`: Algorithm AS 183 from Applied Statistics. 32-bit PRNG with period 2^60. Not cryptographically secure. > > - `xoshiro128pp`: Xoshiro128++ random number generator. 32-bit state-of-the-art PRNG with period 2^128-1. Algorithm by David Blackman and Sebastiano Vigna. > > - `xoshiro128ss`: Xoshiro128\*\* random number generator. 32-bit PRNG with period 2^128-1. Algorithm by David Blackman and Sebastiano Vigna. > > - `xoshiro256pp`: Xoshiro256++ random number generator. 64-bit state-of-the-art PRNG with period 2^256-1. Algorithm by David Blackman and Sebastiano Vigna. > > - `xoshiro256ss`: Xoshiro256\*\* random number generator. 64-bit PRNG with period 2^256-1. Algorithm by David Blackman and Sebastiano Vigna. > > - `splitmix64`: SplitMix64 random number generator. 64-bit PRNG primarily used for seeding other generators. Algorithm by Guy L. Steele Jr. et al. > > - `well512a`: WELL512a 16x32-bit state-of-the-art PRNG with period 2^512-1. Algorithm by by François Panneton, Pierre L’Ecuyer, and Makoto Matsumoto. > > - Algorithms backend compatibility: The SplitMix64, Xoshiro256++, and Xoshiro256\*\* algorithms require support for unbound integer arithmetic. **Inherited public predicates:**  bernoulli/2  beta/3  between/3  binomial/3  chi_squared/2  circular_uniform_cartesian/3  circular_uniform_polar/3  dirichlet/2  enumerate/2  exponential/2  fisher/3  gamma/3  geometric/2  get_seed/1  gumbel/3  hypergeometric/4  logistic/3  lognormal/3  logseries/2  maybe/0  maybe/1  maybe/2  maybe_call/1  maybe_call/2  member/2  normal/3  permutation/2  poisson/2  power/2  random/1  random/3  randseq/4  randset/4  select/3  select/4  sequence/4  set/4  set_seed/1  standard_cauchy/3  standard_exponential/1  standard_gamma/2  standard_normal/1  standard_t/2  swap/2  swap_consecutive/2  triangular/4  uniform/1  uniform/3  von_mises/3  wald/3  weibull/3 - Public predicates - `reset_seed/0` - `randomize/1` - Protected predicates - Private predicates - `seed_/2` - Operators ##### Public predicates ###### `reset_seed/0` Resets the random generator seed to its default value. Use `get_seed/1` and `set_seed/1` instead if you need reproducibility. **Compilation flags:** `static,`` ``synchronized` **Mode and number of proofs:** `reset_seed` - `one` ------------------------------------------------------------------------ ###### `randomize/1` Randomizes the random generator using a positive integer to compute a new seed. Use of a large integer is recommended. In alternative, when using a small integer argument, discard the first dozen random values. **Compilation flags:** `static,`` ``synchronized` **Template:** `randomize(Seed)` **Mode and number of proofs:** `randomize(+positive_integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `seed_/2` Stores the current random generator seed (a ground but otherwise opaque term). **Compilation flags:** `dynamic` **Template:** `seed_(Algorithm,Seed)` **Mode and number of proofs:** `seed_(+atom,-ground)` - `one` ------------------------------------------------------------------------ ##### Operators (none) See also random, fast_random(Algorithm), backend_random **protocol** #### `random_protocol` Random number generator protocol. The predicates are declared as synchronized when the library is compiled using a backend supporting threads. **Availability:** `logtalk_load(random(loader))` **Author:** Paulo Moura **Version:** 3:3:0 **Date:** 2023-11-24 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `random/1` - `between/3` - `member/2` - `select/3` - `select/4` - `swap/2` - `swap_consecutive/2` - `enumerate/2` - `permutation/2` - `sequence/4` - `set/4` - `random/3` - `randseq/4` - `randset/4` - `maybe/0` - `maybe/1` - `maybe/2` - `maybe_call/1` - `maybe_call/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `random/1` Returns a new random float value in the interval `[0.0,`` ``1.0[`. **Compilation flags:** `static,`` ``synchronized` **Template:** `random(Random)` **Mode and number of proofs:** `random(-float)` - `one` ------------------------------------------------------------------------ ###### `between/3` Returns a new random integer in the interval `[Lower,`` ``Upper]`. Fails if `Lower` or `Upper` are not integers or if `Lower`` ``>`` ``Upper`. **Compilation flags:** `static` **Template:** `between(Lower,Upper,Random)` **Mode and number of proofs:** `between(+integer,+integer,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `member/2` Returns a random member of a list. Fails if the list is empty. **Compilation flags:** `static` **Template:** `member(Random,List)` **Mode and number of proofs:** `member(-term,+list(term))` - `zero_or_one` ------------------------------------------------------------------------ ###### `select/3` Returns a random member of a list and the rest of the list. Fails if the list is empty. **Compilation flags:** `static` **Template:** `select(Random,List,Rest)` **Mode and number of proofs:** `select(-term,+list(term),-list(term))` - `zero_or_one` ------------------------------------------------------------------------ ###### `select/4` Returns a random member of a list, replacing it with a new element and returning the resulting list. **Compilation flags:** `static` **Template:** `select(Random,OldList,New,NewList)` **Mode and number of proofs:** `select(-term,+list(term),@term,-list(term))` - `zero_or_one` ------------------------------------------------------------------------ ###### `swap/2` Swaps two randomly selected elements of a list. Fails if the list is empty or contains a single element. **Compilation flags:** `static` **Template:** `swap(OldList,NewList)` **Mode and number of proofs:** `swap(-term,+list(term))` - `zero_or_one` ------------------------------------------------------------------------ ###### `swap_consecutive/2` Swaps two randomly selected consecutive elements of a list. Fails if the list is empty or contains a single element. **Compilation flags:** `static` **Template:** `swap_consecutive(OldList,NewList)` **Mode and number of proofs:** `swap_consecutive(-term,+list(term))` - `zero_or_one` ------------------------------------------------------------------------ ###### `enumerate/2` Enumerates the elements of a list in random order. Fails if the list is empty. **Compilation flags:** `static` **Template:** `enumerate(List,Random)` **Mode and number of proofs:** `enumerate(+list(term),--term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `permutation/2` Returns a random permutation of a list. **Compilation flags:** `static,`` ``synchronized` **Template:** `permutation(List,Permutation)` **Mode and number of proofs:** `permutation(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `sequence/4` Returns list of random integers of given length in random order in interval `[Lower,`` ``Upper]`. Fails if `Length`, `Lower`, or `Upper` are not integers or if `Lower`` ``>`` ``Upper`. **Compilation flags:** `static,`` ``synchronized` **Template:** `sequence(Length,Lower,Upper,List)` **Mode and number of proofs:** `sequence(+integer,+integer,+integer,-list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ###### `set/4` Returns ordered set of random integers of given size in interval `[Lower,`` ``Upper]`. Fails if `Length`, `Lower`, or `Upper` are not integers, if `Lower`` ``>`` ``Upper`, or if `Length`` ``>`` ``Upper`` ``-`` ``Lower`` ``+`` ``1`. **Compilation flags:** `static,`` ``synchronized` **Template:** `set(Length,Lower,Upper,Set)` **Mode and number of proofs:** `set(+integer,+integer,+integer,-list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ###### `random/3` Returns a new random value in the interval `[Lower,`` ``Upper[`. Fails if `Lower`` ``>`` ``Upper`. Deprecated. Use `between/3` for integers. **Compilation flags:** `static,`` ``synchronized` **Template:** `random(Lower,Upper,Random)` **Mode and number of proofs:** `random(+integer,+integer,-integer)` - `zero_or_one` `random(+float,+float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `randseq/4` Returns list of random values of given length in random order in interval `[Lower,`` ``Upper[`. Fails if `Lower`` ``>`` ``Upper` or if the arguments are neither integers or floats. Deprecated. Use `sequence/4` for integers. **Compilation flags:** `static,`` ``synchronized` **Template:** `randseq(Length,Lower,Upper,List)` **Mode and number of proofs:** `randseq(+integer,+integer,+integer,-list(integer))` - `zero_or_one` `randseq(+integer,+float,+float,-list(float))` - `zero_or_one` ------------------------------------------------------------------------ ###### `randset/4` Returns ordered set of random values of given size in interval `[Lower,`` ``Upper[`. Fails if the arguments are neither integers or floats, `Lower`` ``>`` ``Upper`, or `Length`` ``>`` ``Upper`` ``-`` ``Lower` when arguments are integers. Deprecated. Use `set/4` for integers. **Compilation flags:** `static,`` ``synchronized` **Template:** `randset(Length,Lower,Upper,Set)` **Mode and number of proofs:** `randset(+integer,+integer,+integer,-list(integer))` - `zero_or_one` `randset(+integer,+float,+float,-list(float))` - `zero_or_one` ------------------------------------------------------------------------ ###### `maybe/0` Succeeds or fails with equal probability. **Compilation flags:** `static` **Mode and number of proofs:** `maybe` - `zero_or_one` ------------------------------------------------------------------------ ###### `maybe/1` Succeeds with probability `Probability` or fails with probability `1`` ``-`` ``Probability`. Fails if `Probability` is not a float or is outside the interval `[0.0,`` ``1.0]`. **Compilation flags:** `static` **Template:** `maybe(Probability)` **Mode and number of proofs:** `maybe(+probability)` - `zero_or_one` ------------------------------------------------------------------------ ###### `maybe/2` Succeeds with probability `K/N` where `K` and `N` are integers satisfying the equation `0`` ``=<`` ``K`` ``=<`` ``N`. Fails otherwise. **Compilation flags:** `static` **Template:** `maybe(K,N)` **Mode and number of proofs:** `maybe(+non_negative_integer,+non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `maybe_call/1` Calls a goal or fails without calling it with equal probability. When the goal is called, it determines if this predicate succeeds once or fails. **Compilation flags:** `static` **Template:** `maybe_call(Goal)` **Meta-predicate template:** `maybe_call(0)` **Mode and number of proofs:** `maybe_call(+callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `maybe_call/2` Calls a goal or fails without calling it with probability `Probability`. When the goal is called, it determines if this predicate succeeds once or fails. **Compilation flags:** `static` **Template:** `maybe_call(Probability,Goal)` **Meta-predicate template:** `maybe_call(*,0)` **Mode and number of proofs:** `maybe_call(+probability,+callable)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also random, backend_random, fast_random **protocol** #### `sampling_protocol` Predicates for sampling probability distributions. **Availability:** `logtalk_load(random(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2025-02-25 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `normal/3` - `lognormal/3` - `wald/3` - `chi_squared/2` - `fisher/3` - `logseries/2` - `geometric/2` - `hypergeometric/4` - `exponential/2` - `binomial/3` - `bernoulli/2` - `beta/3` - `gamma/3` - `logistic/3` - `poisson/2` - `power/2` - `weibull/3` - `uniform/3` - `uniform/1` - `triangular/4` - `von_mises/3` - `gumbel/3` - `dirichlet/2` - `circular_uniform_polar/3` - `circular_uniform_cartesian/3` - `standard_t/2` - `standard_cauchy/3` - `standard_exponential/1` - `standard_gamma/2` - `standard_normal/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `normal/3` Returns a scaled normally (Gaussian) distributed random value with the given mean and standard deviation. **Compilation flags:** `static` **Template:** `normal(Mean,Deviation,Value)` **Mode and number of proofs:** `normal(+float,+non_negative_float,-float)` - `one` ------------------------------------------------------------------------ ###### `lognormal/3` Returns a scaled log normally distributed random value with the given mean and standard deviation for the normal distribution. **Compilation flags:** `static` **Template:** `lognormal(Mean,Deviation,Value)` **Mode and number of proofs:** `lognormal(+float,+non_negative_float,-float)` - `one` ------------------------------------------------------------------------ ###### `wald/3` Returns a scaled Wald (inverse Gaussian) distributed random value with the given mean. **Compilation flags:** `static` **Template:** `wald(Mean,Scale,Value)` **Mode and number of proofs:** `wald(+positive_float,+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `chi_squared/2` Returns a chi-squared distributed random value given the degrees of freedom. **Compilation flags:** `static` **Template:** `chi_squared(DegreesOfFreedom,Value)` **Mode and number of proofs:** `chi_squared(+positive_integer,-float)` - `one` ------------------------------------------------------------------------ ###### `fisher/3` Returns a Fisher distributed random value given the degrees of freedom in the numerator and in the denominator. **Compilation flags:** `static` **Template:** `fisher(DegreesOfFreedomNumerator,DegreesOfFreedomDenominator,Value)` **Mode and number of proofs:** `fisher(+positive_integer,+positive_integer,-float)` - `one` ------------------------------------------------------------------------ ###### `logseries/2` Returns a logseries distributed random value. Requires `0.0`` ``<`` ``Shape`` ``<`` ``1` and fails otherwise. **Compilation flags:** `static` **Template:** `logseries(Shape,Value)` **Mode and number of proofs:** `logseries(+non_negative_integer,-positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `geometric/2` Returns a geometric distributed random value (trials until the first success). **Compilation flags:** `static` **Template:** `geometric(Probability,Value)` **Mode and number of proofs:** `geometric(+probability,-positive_integer)` - `one` ------------------------------------------------------------------------ ###### `hypergeometric/4` Returns a hypergeometric distributed random value. **Compilation flags:** `static` **Template:** `hypergeometric(Population,Successes,Draws,Value)` **Mode and number of proofs:** `hypergeometric(+non_negative_integer,+non_negative_integer,+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `exponential/2` Returns a scaled exponentially distributed random value. **Compilation flags:** `static` **Template:** `exponential(Scale,Value)` **Mode and number of proofs:** `exponential(+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `binomial/3` Returns a binomial distributed random value. **Compilation flags:** `static` **Template:** `binomial(Trials,Probability,Value)` **Mode and number of proofs:** `binomial(+positive_integer,+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `bernoulli/2` Returns a Bernoulli distributed random value. **Compilation flags:** `static` **Template:** `bernoulli(Probability,Value)` **Mode and number of proofs:** `bernoulli(+positive_integer,-float)` - `one` ------------------------------------------------------------------------ ###### `beta/3` Returns a beta distributed random value. **Compilation flags:** `static` **Template:** `beta(Alpha,Beta,Value)` **Mode and number of proofs:** `beta(+positive_float,+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `gamma/3` Returns a scaled gamma distributed random value. **Compilation flags:** `static` **Template:** `gamma(Shape,Scale,Value)` **Mode and number of proofs:** `gamma(+positive_float,+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `logistic/3` Returns a scaled logistic distributed random value. **Compilation flags:** `static` **Template:** `logistic(Location,Scale,Value)` **Mode and number of proofs:** `logistic(+float,+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `poisson/2` Returns a Poisson distributed random value given the expected number of events. **Compilation flags:** `static` **Template:** `poisson(Mean,Value)` **Mode and number of proofs:** `poisson(+non_negative_float,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `power/2` Returns a power distributed random value. **Compilation flags:** `static` **Template:** `power(Exponent,Value)` **Mode and number of proofs:** `power(+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `weibull/3` Returns a scaled Weibull distributed random value. **Compilation flags:** `static` **Template:** `weibull(Shape,Scale,Value)` **Mode and number of proofs:** `weibull(+float,+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `uniform/3` Returns a uniform distributed random value in the interval\`\`\[Lower, Upper\[`.`` ``Fails`` ``if`` ```` ``Lower ``` or `Upper` are not integers or if `Lower`` ``>`` ``Upper`. Same as `random/3`. **Compilation flags:** `static` **Template:** `uniform(Lower,Upper,Value)` **Mode and number of proofs:** `uniform(+float,+float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `uniform/1` Returns a uniform distributed random value in the interval\`\`\[0.0, 1.0\[`.`` ``Same`` ``as`` ```` ``random/1 ```. **Compilation flags:** `static` **Template:** `uniform(Value)` **Mode and number of proofs:** `uniform(-float)` - `one` ------------------------------------------------------------------------ ###### `triangular/4` Returns a triangular distributed random value. Fails if the `Left`` ``=<`` ``Mode`` ``=<`` ``Right` condition does not hold. **Compilation flags:** `static` **Template:** `triangular(Left,Mode,Right,Value)` **Mode and number of proofs:** `triangular(+float,+float,+float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `von_mises/3` Returns a von Mises distributed random value. **Compilation flags:** `static` **Template:** `von_mises(Mode,Concentration,Value)` **Mode and number of proofs:** `von_mises(+float,+non_negative_float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `gumbel/3` Returns a Gumbel distributed random value. **Compilation flags:** `static` **Template:** `gumbel(Location,Scale,Value)` **Mode and number of proofs:** `gumbel(+float,+non_negative_float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `dirichlet/2` Returns a Dirichlet distributed list of random values. **Compilation flags:** `static` **Template:** `dirichlet(Alphas,Thetas)` **Mode and number of proofs:** `dirichlet(+list(positive_float),-list(positive_float))` - `one` ------------------------------------------------------------------------ ###### `circular_uniform_polar/3` Returns a circular uniform distributed random point in polar coordinates given the circle radius. **Compilation flags:** `static` **Template:** `circular_uniform_polar(Radius,Rho,Theta)` **Mode and number of proofs:** `circular_uniform_polar(+float,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `circular_uniform_cartesian/3` Returns a circular uniform distributed random point in cartesian coordinates given the circle radius. **Compilation flags:** `static` **Template:** `circular_uniform_cartesian(Radius,X,Y)` **Mode and number of proofs:** `circular_uniform_cartesian(+float,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `standard_t/2` Returns a standard Student’s t distributed random value given the degrees of freedom. **Compilation flags:** `static` **Template:** `standard_t(DegreesOfFreedom,Value)` **Mode and number of proofs:** `standard_t(+positive_integer,-float)` - `one` ------------------------------------------------------------------------ ###### `standard_cauchy/3` Returns a standard Cauchy distributed random value. **Compilation flags:** `static` **Template:** `standard_cauchy(Location,Scale,Value)` **Mode and number of proofs:** `standard_cauchy(+float,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `standard_exponential/1` Returns a standard exponential distributed random value. **Compilation flags:** `static` **Template:** `standard_exponential(Value)` **Mode and number of proofs:** `standard_exponential(-float)` - `one` ------------------------------------------------------------------------ ###### `standard_gamma/2` Returns a standard gamma distributed random value. **Compilation flags:** `static` **Template:** `standard_gamma(Shape,Value)` **Mode and number of proofs:** `standard_gamma(+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `standard_normal/1` Returns a standard normally (Gaussian) distributed random value (using a default mean of 0.0 and a default deviation of 1.0). **Compilation flags:** `static` **Template:** `standard_normal(Value)` **Mode and number of proofs:** `standard_normal(-float)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also random_protocol, pseudo_random_protocol ### random_forest_classifier") **object** #### `random_forest_classifier` Random Forest classifier using C4.5 decision trees as base learners. Builds an ensemble of decision trees trained on bootstrap samples with random feature subsets and combines their predictions through majority voting. **Availability:** `logtalk_load(random_forest_classifier(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** c45_classifier fast_random(Algorithm) format list pairs type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, c45_classifier, isolation_forest_anomaly_detector, knn_classifier, naive_bayes_classifier, nearest_centroid_classifier, adaptive_boosting_classifier ### random_forest_regression") **object** #### `random_forest_regression` Random Forest regression using regression trees as base learners trained on bootstrap samples and per-split random feature subsets. **Availability:** `logtalk_load(random_forest_regression(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** fast_random(Algorithm) format list population regression_tree type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, knn_regression, regression_tree, gradient_boosting_regression ### random_projection") **object** #### `random_projection` Random projection reducer for continuous datasets using a portable seeded Rademacher projection matrix. **Availability:** `logtalk_load(random_projection(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** fast_random(Algorithm) format list pairs type **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also lda_projection, pca_projection ### rank_centrality") **object** #### `rank_centrality` Rank Centrality pairwise preference ranker. Learns one stationary probability score per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by applying power iteration to the Rank Centrality Markov chain built from aggregated head-to-head outcomes, and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(rank_centrality(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_common **Uses:** avltree format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, bradley_terry_ranker, copeland_ranker ### ranked_pairs") **object** #### `ranked_pairs` Ranked Pairs pairwise preference ranker. Learns one deterministic score per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by locking direct pairwise victories in descending strength order while avoiding cycles and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(ranked_pairs(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-06-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common `public` condorcet_victory_common **Uses:** avltree list numberlist **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - `locked_pairs/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `locked_pairs/2` Returns the accepted lock graph in lock order as `lock(Item1,Item2,Strength)` terms for the learned items. **Compilation flags:** `static` **Template:** `locked_pairs(Ranker,LockedPairs)` **Mode and number of proofs:** `locked_pairs(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, schulze_ranker, copeland_ranker ### ranking_protocols") **category** #### `condorcet_victory_common` Shared direct-victory preprocessing helpers for Condorcet-family rankers. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-26 **Compilation flags:** `static` **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `index_items/3` - `build_direct_strengths/5` - `zero_matrix/2` - `matrix_entry/4` - `set_matrix_entry/5` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `index_items/3` Builds `Item-Index` pairs for the ordered training items. **Compilation flags:** `static` **Template:** `index_items(Items,Index,Indices)` **Mode and number of proofs:** `index_items(+list,+integer,-list)` - `one` ------------------------------------------------------------------------ ###### `build_direct_strengths/5` Builds the dense direct-victory strength matrix from aggregated pairwise matchups using the selected victory-strength semantics. **Compilation flags:** `static` **Template:** `build_direct_strengths(Matchups,IndexDictionary,Count,VictoryStrength,DirectStrengths)` **Mode and number of proofs:** `build_direct_strengths(+list,+compound,+integer,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `zero_matrix/2` Builds a square zero matrix with the given row and column count. **Compilation flags:** `static` **Template:** `zero_matrix(Count,Matrix)` **Mode and number of proofs:** `zero_matrix(+integer,-list)` - `one` ------------------------------------------------------------------------ ###### `matrix_entry/4` Returns the value stored at the given matrix row and column. **Compilation flags:** `static` **Template:** `matrix_entry(Matrix,RowIndex,ColumnIndex,Value)` **Mode and number of proofs:** `matrix_entry(+list,+integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `set_matrix_entry/5` Returns an updated matrix where the given row and column entry was replaced by the supplied value. **Compilation flags:** `static` **Template:** `set_matrix_entry(Matrix,RowIndex,ColumnIndex,Value,UpdatedMatrix)` **Mode and number of proofs:** `set_matrix_entry(+list,+integer,+integer,+integer,-list)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `glicko2_common` Shared internal Glicko-2 numeric helpers for rating updates, volatility search, and scale conversions. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-02 **Compilation flags:** `static` **Uses:** avltree **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `update_item_parameters/10` - `to_mu/2` - `to_phi/2` - `to_rating/2` - `to_deviation/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `update_item_parameters/10` Computes the simultaneous Glicko-2 rating, deviation, and volatility update for one item over a rating period using the current dictionaries and aggregated game results. **Compilation flags:** `static` **Template:** `update_item_parameters(Item,ItemResults,Ratings,Deviations,Volatilities,Tau,VolatilityTolerance,UpdatedRating,UpdatedDeviation,UpdatedVolatility)` **Mode and number of proofs:** `update_item_parameters(+term,+list(compound),+compound,+compound,+compound,+number,+number,-number,-number,-number)` - `one` ------------------------------------------------------------------------ ###### `to_mu/2` Converts a rating on the external Glicko scale to the internal `mu` scale. **Compilation flags:** `static` **Template:** `to_mu(Rating,Mu)` **Mode and number of proofs:** `to_mu(+number,-number)` - `one` ------------------------------------------------------------------------ ###### `to_phi/2` Converts a rating deviation on the external Glicko scale to the internal `phi` scale. **Compilation flags:** `static` **Template:** `to_phi(Deviation,Phi)` **Mode and number of proofs:** `to_phi(+number,-number)` - `one` ------------------------------------------------------------------------ ###### `to_rating/2` Converts a value on the internal `mu` scale back to the external Glicko rating scale. **Compilation flags:** `static` **Template:** `to_rating(Mu,Rating)` **Mode and number of proofs:** `to_rating(+number,-number)` - `one` ------------------------------------------------------------------------ ###### `to_deviation/2` Converts a value on the internal `phi` scale back to the external Glicko rating-deviation scale. **Compilation flags:** `static` **Template:** `to_deviation(Phi,Deviation)` **Mode and number of proofs:** `to_deviation(+number,-number)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `grouped_strength_ranker_common` Shared connectivity, positive-strength, and iterative-update helpers for grouped ranking models that learn one strength parameter per item. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-25 **Compilation flags:** `static` **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `update_strengths/4` - `initial_strengths/2` - `strength_pairs/3` - `optimize_strengths/8` - `strength_dictionary/2` - `require_strong_connectivity/4` - `strongly_connected/3` - `strongly_connected_components/4` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `update_strengths/4` Hook predicate that importing rankers must define to perform one synchronous strength-update iteration. **Compilation flags:** `static` **Template:** `update_strengths(Context,Strengths0,Strengths,MaximumDifference)` **Mode and number of proofs:** `update_strengths(+nonvar,+list(number),-list(number),-number)` - `one` ------------------------------------------------------------------------ ###### `initial_strengths/2` Initializes a positive strength vector with a uniform value for each ordered item. **Compilation flags:** `static` **Template:** `initial_strengths(Items,Strengths)` **Mode and number of proofs:** `initial_strengths(+list,-list(float))` - `one` ------------------------------------------------------------------------ ###### `strength_pairs/3` Pairs ordered items with their learned strength values. **Compilation flags:** `static` **Template:** `strength_pairs(Items,StrengthValues,Strengths)` **Mode and number of proofs:** `strength_pairs(+list,+list(number),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `optimize_strengths/8` Runs the iterative strength-update loop until convergence or the maximum iteration bound is reached. **Compilation flags:** `static` **Template:** `optimize_strengths(MaximumIterations,Tolerance,UpdateContext,Strengths0,Strengths,Status,Iterations,FinalDifference)` **Mode and number of proofs:** `optimize_strengths(+integer,+number,+nonvar,+list(number),-list(number),-atom,-integer,-number)` - `one` ------------------------------------------------------------------------ ###### `strength_dictionary/2` Builds an index-addressable dictionary from an ordered list of strength values. **Compilation flags:** `static` **Template:** `strength_dictionary(Strengths,Dictionary)` **Mode and number of proofs:** `strength_dictionary(+list(number),-compound)` - `one` ------------------------------------------------------------------------ ###### `require_strong_connectivity/4` Checks that the directed graph is strongly connected and throws a domain error with the strongly connected components otherwise. **Compilation flags:** `static` **Template:** `require_strong_connectivity(Count,DirectedAdjacency,ReverseAdjacency,ErrorDomain)` **Mode and number of proofs:** `require_strong_connectivity(+integer,+compound,+compound,+atom)` - `one` ------------------------------------------------------------------------ ###### `strongly_connected/3` True when all indexed items are mutually reachable in both the forward and reverse adjacency graphs. **Compilation flags:** `static` **Template:** `strongly_connected(Count,DirectedAdjacency,ReverseAdjacency)` **Mode and number of proofs:** `strongly_connected(+integer,+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `strongly_connected_components/4` Computes the strongly connected components of the directed graph induced by the forward and reverse adjacency dictionaries. **Compilation flags:** `static` **Template:** `strongly_connected_components(Count,DirectedAdjacency,ReverseAdjacency,Components)` **Mode and number of proofs:** `strongly_connected_components(+integer,+compound,+compound,-list)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `pairwise_measurement_dataset_protocol` Protocol for pairwise measurement datasets. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `item/1` - `measurement/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `item/1` Enumerates by backtracking the items that can be ranked. **Compilation flags:** `static` **Template:** `item(Item)` **Mode and number of proofs:** `item(-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `measurement/4` Enumerates by backtracking weighted pairwise signed measurements where `Value` is the observed scalar measurement for the oriented edge `Item1`` ``->`` ``Item2` and `Weight` is its positive confidence or repetition weight. **Compilation flags:** `static` **Template:** `measurement(Item1,Item2,Value,Weight)` **Mode and number of proofs:** `measurement(-atom,-atom,-number,-number)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **protocol** #### `pairwise_ranking_dataset_protocol` Protocol for pairwise ranking datasets. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `item/1` - `preference/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `item/1` Enumerates by backtracking the items that can be ranked. **Compilation flags:** `static` **Template:** `item(Item)` **Mode and number of proofs:** `item(-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `preference/3` Enumerates by backtracking weighted pairwise preferences where `Winner` is preferred over `Loser` `Weight` times. **Compilation flags:** `static` **Template:** `preference(Winner,Loser,Weight)` **Mode and number of proofs:** `preference(-atom,-atom,-number)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `pairwise_strength_ranker_common` Shared preprocessing, connectivity, and MM-iteration helpers for pairwise strength rankers. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-25 **Compilation flags:** `static` **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `update_strengths/4` - `initial_strengths/2` - `strength_pairs/3` - `index_items/3` - `preprocess_matchups/6` - `build_dataset_model/5` - `require_strong_connectivity/4` - `strongly_connected/3` - `strongly_connected_components/4` - `optimize_strengths/8` - `strength_dictionary/2` - `item_denominator/5` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `update_strengths/4` Hook predicate that importing rankers must define to perform one synchronous strength-update iteration. **Compilation flags:** `static` **Template:** `update_strengths(Context,Strengths0,Strengths,MaximumDifference)` **Mode and number of proofs:** `update_strengths(+nonvar,+list(number),-list(number),-number)` - `one` ------------------------------------------------------------------------ ###### `initial_strengths/2` Initializes a positive strength vector with a uniform value for each ordered item. **Compilation flags:** `static` **Template:** `initial_strengths(Items,Strengths)` **Mode and number of proofs:** `initial_strengths(+list,-list(float))` - `one` ------------------------------------------------------------------------ ###### `strength_pairs/3` Pairs ordered items with their learned strength values. **Compilation flags:** `static` **Template:** `strength_pairs(Items,StrengthValues,Strengths)` **Mode and number of proofs:** `strength_pairs(+list,+list(number),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `index_items/3` Builds `Item-Index` pairs for the ordered training items. **Compilation flags:** `static` **Template:** `index_items(Items,Index,Indices)` **Mode and number of proofs:** `index_items(+list,+integer,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `preprocess_matchups/6` Builds directed adjacency, reverse adjacency, per-item win totals, and undirected pair-adjacency structures from aggregated pairwise matchups. **Compilation flags:** `static` **Template:** `preprocess_matchups(Matchups,IndexDictionary,DirectedAdjacency,ReverseAdjacency,WinWeights,PairAdjacency)` **Mode and number of proofs:** `preprocess_matchups(+list,+compound,-compound,-compound,-compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `build_dataset_model/5` Materializes dense per-item win totals and weighted undirected adjacency lists from the sparse preprocessing dictionaries. **Compilation flags:** `static` **Template:** `build_dataset_model(Count,WinWeights,PairAdjacency,PairWeights,Wins)` **Mode and number of proofs:** `build_dataset_model(+integer,+compound,+compound,-list,-list(number))` - `one` ------------------------------------------------------------------------ ###### `require_strong_connectivity/4` Checks that the directed graph is strongly connected and throws a domain error with the strongly connected components otherwise. **Compilation flags:** `static` **Template:** `require_strong_connectivity(Count,DirectedAdjacency,ReverseAdjacency,ErrorDomain)` **Mode and number of proofs:** `require_strong_connectivity(+integer,+compound,+compound,+atom)` - `one` ------------------------------------------------------------------------ ###### `strongly_connected/3` True when all indexed items are mutually reachable in both the forward and reverse adjacency graphs. **Compilation flags:** `static` **Template:** `strongly_connected(Count,DirectedAdjacency,ReverseAdjacency)` **Mode and number of proofs:** `strongly_connected(+integer,+compound,+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `strongly_connected_components/4` Computes the strongly connected components of the directed graph induced by the forward and reverse adjacency dictionaries. **Compilation flags:** `static` **Template:** `strongly_connected_components(Count,DirectedAdjacency,ReverseAdjacency,Components)` **Mode and number of proofs:** `strongly_connected_components(+integer,+compound,+compound,-list)` - `one` ------------------------------------------------------------------------ ###### `optimize_strengths/8` Runs the iterative strength-update loop until convergence or the maximum iteration bound is reached. **Compilation flags:** `static` **Template:** `optimize_strengths(MaximumIterations,Tolerance,UpdateContext,Strengths0,Strengths,Status,Iterations,FinalDifference)` **Mode and number of proofs:** `optimize_strengths(+integer,+number,+nonvar,+list(number),-list(number),-atom,-integer,-number)` - `one` ------------------------------------------------------------------------ ###### `strength_dictionary/2` Builds an index-addressable dictionary from an ordered list of strength values. **Compilation flags:** `static` **Template:** `strength_dictionary(Strengths,Dictionary)` **Mode and number of proofs:** `strength_dictionary(+list(number),-compound)` - `one` ------------------------------------------------------------------------ ###### `item_denominator/5` Accumulates the pairwise MM denominator for one item using the current strength dictionary and weighted neighbors. **Compilation flags:** `static` **Template:** `item_denominator(Neighbors,StrengthDictionary,CurrentStrength,Denominator0,Denominator)` **Mode and number of proofs:** `item_denominator(+list(pair),+compound,+number,+number,-number)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `plackett_luce_common` Shared helpers for grouped Plackett-Luce rankers. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-26 **Compilation flags:** `static` **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `index_items/3` - `preprocess_groups/10` - `selection_exposures/4` - `normalize_strengths/6` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `index_items/3` Builds `Item-Index` pairs for the ordered training items. **Compilation flags:** `static` **Template:** `index_items(Items,Index,Indices)` **Mode and number of proofs:** `index_items(+list,+integer,-list)` - `one` ------------------------------------------------------------------------ ###### `preprocess_groups/10` Builds per-group choice steps, selection counts, and forward and reverse adjacency dictionaries from grouped rankings under the selected traversal order. **Compilation flags:** `static` **Template:** `preprocess_groups(Order,Groups,Dataset,MissingRelevance,IndexDictionary,Count,Steps,SelectionCounts,DirectedAdjacency,ReverseAdjacency)` **Mode and number of proofs:** `preprocess_groups(+atom,+list,+object_identifier,+atom,+compound,+integer,-list,-list,-compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `selection_exposures/4` Computes the per-item exposure counts implied by the grouped choice steps and the current value dictionary. **Compilation flags:** `static` **Template:** `selection_exposures(Steps,SelectionCounts,ValueDictionary,ExposureCounts)` **Mode and number of proofs:** `selection_exposures(+list,+list,+compound,-list)` - `one` ------------------------------------------------------------------------ ###### `normalize_strengths/6` Normalizes raw strength values to sum to one while tracking the maximum absolute change from the current strengths. **Compilation flags:** `static` **Template:** `normalize_strengths(RawStrengths,TotalRawStrength,CurrentStrengths,Strengths,MaximumDifference0,MaximumDifference)` **Mode and number of proofs:** `normalize_strengths(+list(number),+number,+list(number),-list(number),+number,-number)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `ranker_common` Shared predicates for ranker score access, diagnostics, and export. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-30 **Compilation flags:** `static` **Implements:** `public` ranker_protocol **Extends:** `public` options **Uses:** avltree format list type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_ranker/1  rank/3  ranker_options/2  scores/2  valid_option/1  valid_options/1  valid_ranker/1 - Public predicates - Protected predicates - `ranker_scores_data/2` - `ranker_diagnostics_data/2` - `ranker_export_template/4` - `ranker_term_template/2` - `print_ranker_template/1` - `valid_ranker_metadata/2` - `valid_item_value_pairs/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `ranker_scores_data/2` Hook predicate that importing ranker implementations must define in order to expose the learned item-score pairs on the ranker native numeric scale. **Compilation flags:** `static` **Template:** `ranker_scores_data(Ranker,Scores)` **Mode and number of proofs:** `ranker_scores_data(+compound,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `ranker_diagnostics_data/2` Hook predicate that importing ranker implementations must define in order to expose diagnostics metadata. **Compilation flags:** `static` **Template:** `ranker_diagnostics_data(Ranker,Diagnostics)` **Mode and number of proofs:** `ranker_diagnostics_data(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `ranker_export_template/4` Hook predicate that importing ranker implementations must define in order to expose the exported ranker template for a given functor. **Compilation flags:** `static` **Template:** `ranker_export_template(Dataset,Ranker,Functor,Template)` **Mode and number of proofs:** `ranker_export_template(+object_identifier,+compound,+atom,-callable)` - `one` ------------------------------------------------------------------------ ###### `ranker_term_template/2` Hook predicate that importing ranker implementations must define in order to expose the learned ranker term template used by pretty-printing helpers. **Compilation flags:** `static` **Template:** `ranker_term_template(Ranker,Template)` **Mode and number of proofs:** `ranker_term_template(+compound,-callable)` - `one` ------------------------------------------------------------------------ ###### `print_ranker_template/1` Pretty-printing helper predicate used by importing ranker implementations to show the learned ranker term template. **Compilation flags:** `static` **Template:** `print_ranker_template(Ranker)` **Mode and number of proofs:** `print_ranker_template(+compound)` - `one` ------------------------------------------------------------------------ ###### `valid_ranker_metadata/2` True when the diagnostics list contains the expected model identifier, a valid effective options list, and a structurally valid dataset summary. **Compilation flags:** `static` **Template:** `valid_ranker_metadata(Model,Diagnostics)` **Mode and number of proofs:** `valid_ranker_metadata(+atom,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_item_value_pairs/2` True when the second argument is an ordered list of unique `Item-Value` pairs aligned with the first argument item list. **Compilation flags:** `static` **Template:** `valid_item_value_pairs(Items,Pairs)` **Mode and number of proofs:** `valid_item_value_pairs(+list,+list(pair))` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `ranker_protocol` Protocol for machine learning rankers. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `learn/3` - `learn/2` - `rank/3` - `scores/2` - `diagnostics/2` - `diagnostic/2` - `ranker_options/2` - `check_ranker/1` - `valid_ranker/1` - `export_to_clauses/4` - `export_to_file/4` - `print_ranker/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `learn/3` Learns a ranker from the given dataset object using the specified options. **Compilation flags:** `static` **Template:** `learn(Dataset,Ranker,Options)` **Mode and number of proofs:** `learn(+object_identifier,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `learn/2` Learns a ranker from the given dataset object using default options. **Compilation flags:** `static` **Template:** `learn(Dataset,Ranker)` **Mode and number of proofs:** `learn(+object_identifier,-compound)` - `one` ------------------------------------------------------------------------ ###### `rank/3` Ranks a list of candidate items using the learned ranker and returns the candidates ordered from most preferred to least preferred. **Compilation flags:** `static` **Template:** `rank(Ranker,Candidates,Ranking)` **Mode and number of proofs:** `rank(+compound,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `scores/2` Returns the learned item-score pairs on the ranker native numeric scale. Depending on the ranker, these values may also be interpreted more specifically as strengths or ratings. **Compilation flags:** `static` **Template:** `scores(Ranker,Scores)` **Mode and number of proofs:** `scores(+compound,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `diagnostics/2` Returns diagnostics and metadata associated with a learned ranker in a representation-independent way. **Compilation flags:** `static` **Template:** `diagnostics(Ranker,Diagnostics)` **Mode and number of proofs:** `diagnostics(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostic/2` Tests or enumerates individual diagnostics metadata terms for a learned ranker. **Compilation flags:** `static` **Template:** `diagnostic(Ranker,Diagnostic)` **Mode and number of proofs:** `diagnostic(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `ranker_options/2` Returns the effective training options recorded in a learned ranker diagnostics list. **Compilation flags:** `static` **Template:** `ranker_options(Ranker,Options)` **Mode and number of proofs:** `ranker_options(+compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `check_ranker/1` Checks that the argument is a structurally valid learned ranker term for the receiving ranker implementation, throwing an exception on invalid input when applicable. **Compilation flags:** `static` **Template:** `check_ranker(Ranker)` **Mode and number of proofs:** `check_ranker(@compound)` - `one_or_error` **Exceptions:** `Ranker` is a variable: `instantiation_error` `Ranker` is neither a variable nor a valid ranker: `domain_error(ranker,Ranker)` ------------------------------------------------------------------------ ###### `valid_ranker/1` True when check_ranker/1 succeeds for the argument without throwing an exception. **Compilation flags:** `static` **Template:** `valid_ranker(Ranker)` **Mode and number of proofs:** `valid_ranker(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `export_to_clauses/4` Converts a ranker into a list of predicate clauses. `Functor` is the functor for the generated predicate clauses. When exporting a serialized ranker term, a noun such as `ranker` or `model` is usually clearer than a verb or result label. **Compilation flags:** `static` **Template:** `export_to_clauses(Dataset,Ranker,Functor,Clauses)` **Mode and number of proofs:** `export_to_clauses(+object_identifier,+compound,+callable,-list(clause))` - `one` ------------------------------------------------------------------------ ###### `export_to_file/4` Exports a ranker to a file. `Functor` is the functor for the generated predicate clauses. When exporting a serialized ranker term, a noun such as `ranker` or `model` is usually clearer than a verb or result label. **Compilation flags:** `static` **Template:** `export_to_file(Dataset,Ranker,Functor,File)` **Mode and number of proofs:** `export_to_file(+object_identifier,+compound,+callable,+atom)` - `one` ------------------------------------------------------------------------ ###### `print_ranker/1` Prints a ranker to the current output stream in a human-readable format. **Compilation flags:** `static` **Template:** `print_ranker(Ranker)` **Mode and number of proofs:** `print_ranker(+compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also bradley_terry_ranker, ranking_dataset_protocol, pairwise_ranking_dataset_protocol **category** #### `ranking_dataset_common` Shared predicates for collecting, analyzing, and validating ranking datasets. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-18 **Compilation flags:** `static` **Uses:** avltree list numberlist **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `pairwise_dataset_declared_items/2` - `pairwise_dataset_items/2` - `pairwise_dataset_preferences/2` - `pairwise_dataset_connected_components/2` - `pairwise_dataset_summary/2` - `pairwise_dataset_win_totals/2` - `pairwise_dataset_matchups/2` - `pairwise_measurement_dataset_declared_items/2` - `pairwise_measurement_dataset_items/2` - `pairwise_measurement_dataset_measurements/2` - `pairwise_measurement_dataset_connected_components/2` - `pairwise_measurement_dataset_summary/2` - `temporal_pairwise_dataset_declared_items/2` - `temporal_pairwise_dataset_items/2` - `temporal_pairwise_dataset_periods/2` - `temporal_pairwise_dataset_games/2` - `temporal_pairwise_dataset_games/3` - `temporal_pairwise_dataset_connected_components/2` - `temporal_pairwise_dataset_summary/2` - `grouped_dataset_groups/2` - `grouped_dataset_items/2` - `grouped_dataset_items/3` - `grouped_dataset_summary/2` - `validate_pairwise_dataset/1` - `validate_pairwise_dataset/2` - `validate_pairwise_measurement_dataset/1` - `validate_pairwise_measurement_dataset/2` - `validate_grouped_dataset/1` - `validate_temporal_pairwise_dataset/1` - `validate_temporal_pairwise_dataset/2` - `validate_grouped_dataset/2` - Protected predicates - `grouped_dataset_item_relevances/4` - `grouped_dataset_relevance_frequencies/2` - `grouped_dataset_item_relevance_scores/3` - `grouped_dataset_tie_blocks/4` - Private predicates - Operators ##### Public predicates ###### `pairwise_dataset_declared_items/2` Collects the pairwise dataset declared items preserving declaration order. **Compilation flags:** `static` **Template:** `pairwise_dataset_declared_items(Dataset,Items)` **Mode and number of proofs:** `pairwise_dataset_declared_items(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `pairwise_dataset_items/2` Collects the unique pairwise dataset items preserving their first declaration order. **Compilation flags:** `static` **Template:** `pairwise_dataset_items(Dataset,Items)` **Mode and number of proofs:** `pairwise_dataset_items(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `pairwise_dataset_preferences/2` Collects the pairwise dataset preferences as `p(Winner,Loser,Weight)` terms. **Compilation flags:** `static` **Template:** `pairwise_dataset_preferences(Dataset,Preferences)` **Mode and number of proofs:** `pairwise_dataset_preferences(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `pairwise_dataset_connected_components/2` Returns the connected components induced by the pairwise preference graph. **Compilation flags:** `static` **Template:** `pairwise_dataset_connected_components(Dataset,Components)` **Mode and number of proofs:** `pairwise_dataset_connected_components(+object_identifier,-list(list))` - `one` ------------------------------------------------------------------------ ###### `pairwise_dataset_summary/2` Returns a summary of a pairwise dataset, including item, preference, component, and isolated-item counts. **Compilation flags:** `static` **Template:** `pairwise_dataset_summary(Dataset,Summary)` **Mode and number of proofs:** `pairwise_dataset_summary(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `pairwise_dataset_win_totals/2` Returns per-item total win weights for a pairwise dataset. **Compilation flags:** `static` **Template:** `pairwise_dataset_win_totals(Dataset,Totals)` **Mode and number of proofs:** `pairwise_dataset_win_totals(+object_identifier,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `pairwise_dataset_matchups/2` Returns aggregated pairwise matchups as `matchup(Item1,Item2,Item1Wins,Item2Wins)` terms preserving item declaration order inside each pair. **Compilation flags:** `static` **Template:** `pairwise_dataset_matchups(Dataset,Matchups)` **Mode and number of proofs:** `pairwise_dataset_matchups(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `pairwise_measurement_dataset_declared_items/2` Collects the pairwise measurement dataset declared items preserving declaration order. **Compilation flags:** `static` **Template:** `pairwise_measurement_dataset_declared_items(Dataset,Items)` **Mode and number of proofs:** `pairwise_measurement_dataset_declared_items(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `pairwise_measurement_dataset_items/2` Collects the unique pairwise measurement dataset items preserving their first declaration order. **Compilation flags:** `static` **Template:** `pairwise_measurement_dataset_items(Dataset,Items)` **Mode and number of proofs:** `pairwise_measurement_dataset_items(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `pairwise_measurement_dataset_measurements/2` Collects the pairwise measurement dataset observations as `m(Item1,Item2,Value,Weight)` terms preserving enumeration order. **Compilation flags:** `static` **Template:** `pairwise_measurement_dataset_measurements(Dataset,Measurements)` **Mode and number of proofs:** `pairwise_measurement_dataset_measurements(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `pairwise_measurement_dataset_connected_components/2` Returns the connected components induced by the pairwise measurement support graph. **Compilation flags:** `static` **Template:** `pairwise_measurement_dataset_connected_components(Dataset,Components)` **Mode and number of proofs:** `pairwise_measurement_dataset_connected_components(+object_identifier,-list(list))` - `one` ------------------------------------------------------------------------ ###### `pairwise_measurement_dataset_summary/2` Returns a summary of a pairwise measurement dataset, including item, measurement, component, and isolated-item counts. **Compilation flags:** `static` **Template:** `pairwise_measurement_dataset_summary(Dataset,Summary)` **Mode and number of proofs:** `pairwise_measurement_dataset_summary(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `temporal_pairwise_dataset_declared_items/2` Collects the temporal pairwise dataset declared items preserving declaration order. **Compilation flags:** `static` **Template:** `temporal_pairwise_dataset_declared_items(Dataset,Items)` **Mode and number of proofs:** `temporal_pairwise_dataset_declared_items(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `temporal_pairwise_dataset_items/2` Collects the unique temporal pairwise dataset items preserving their first declaration order. **Compilation flags:** `static` **Template:** `temporal_pairwise_dataset_items(Dataset,Items)` **Mode and number of proofs:** `temporal_pairwise_dataset_items(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `temporal_pairwise_dataset_periods/2` Collects the unique temporal pairwise dataset periods preserving their first declaration order. **Compilation flags:** `static` **Template:** `temporal_pairwise_dataset_periods(Dataset,Periods)` **Mode and number of proofs:** `temporal_pairwise_dataset_periods(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `temporal_pairwise_dataset_games/2` Collects the temporal pairwise dataset games as `game(Period,Item1,Item2,Score)` terms preserving enumeration order. **Compilation flags:** `static` **Template:** `temporal_pairwise_dataset_games(Dataset,Games)` **Mode and number of proofs:** `temporal_pairwise_dataset_games(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `temporal_pairwise_dataset_games/3` Collects the temporal pairwise dataset games for a single period as `game(Item1,Item2,Score)` terms preserving enumeration order. **Compilation flags:** `static` **Template:** `temporal_pairwise_dataset_games(Dataset,Period,Games)` **Mode and number of proofs:** `temporal_pairwise_dataset_games(+object_identifier,+term,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `temporal_pairwise_dataset_connected_components/2` Returns the connected components induced by the temporal pairwise game graph. **Compilation flags:** `static` **Template:** `temporal_pairwise_dataset_connected_components(Dataset,Components)` **Mode and number of proofs:** `temporal_pairwise_dataset_connected_components(+object_identifier,-list(list))` - `one` ------------------------------------------------------------------------ ###### `temporal_pairwise_dataset_summary/2` Returns a summary of a temporal pairwise dataset, including item, period, game, component, and isolated-item counts. **Compilation flags:** `static` **Template:** `temporal_pairwise_dataset_summary(Dataset,Summary)` **Mode and number of proofs:** `temporal_pairwise_dataset_summary(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `grouped_dataset_groups/2` Collects the unique grouped-dataset groups preserving their first declaration order. **Compilation flags:** `static` **Template:** `grouped_dataset_groups(Dataset,Groups)` **Mode and number of proofs:** `grouped_dataset_groups(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `grouped_dataset_items/2` Collects the unique items declared across all groups in a grouped dataset preserving their first declaration order. **Compilation flags:** `static` **Template:** `grouped_dataset_items(Dataset,Items)` **Mode and number of proofs:** `grouped_dataset_items(+object_identifier,-list)` - `one` ------------------------------------------------------------------------ ###### `grouped_dataset_items/3` Collects the unique items declared for a grouped-dataset group. **Compilation flags:** `static` **Template:** `grouped_dataset_items(Dataset,Group,Items)` **Mode and number of proofs:** `grouped_dataset_items(+object_identifier,+term,-list)` - `one` ------------------------------------------------------------------------ ###### `grouped_dataset_summary/2` Returns a summary of a grouped dataset, including group, item, and relevance-judgment counts. **Compilation flags:** `static` **Template:** `grouped_dataset_summary(Dataset,Summary)` **Mode and number of proofs:** `grouped_dataset_summary(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `validate_pairwise_dataset/1` Validates a pairwise ranking dataset and throws an error if the dataset is malformed or disconnected. **Compilation flags:** `static` **Template:** `validate_pairwise_dataset(Dataset)` **Mode and number of proofs:** `validate_pairwise_dataset(+object_identifier)` - `one` ------------------------------------------------------------------------ ###### `validate_pairwise_dataset/2` Validates a pairwise ranking dataset and returns its dataset summary when validation succeeds. **Compilation flags:** `static` **Template:** `validate_pairwise_dataset(Dataset,Summary)` **Mode and number of proofs:** `validate_pairwise_dataset(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `validate_pairwise_measurement_dataset/1` Validates a pairwise measurement dataset and throws an error if the dataset is malformed or disconnected. **Compilation flags:** `static` **Template:** `validate_pairwise_measurement_dataset(Dataset)` **Mode and number of proofs:** `validate_pairwise_measurement_dataset(+object_identifier)` - `one` ------------------------------------------------------------------------ ###### `validate_pairwise_measurement_dataset/2` Validates a pairwise measurement dataset and returns its dataset summary when validation succeeds. **Compilation flags:** `static` **Template:** `validate_pairwise_measurement_dataset(Dataset,Summary)` **Mode and number of proofs:** `validate_pairwise_measurement_dataset(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `validate_grouped_dataset/1` Validates a grouped ranking dataset and throws an error if the dataset is malformed. **Compilation flags:** `static` **Template:** `validate_grouped_dataset(Dataset)` **Mode and number of proofs:** `validate_grouped_dataset(+object_identifier)` - `one` ------------------------------------------------------------------------ ###### `validate_temporal_pairwise_dataset/1` Validates a temporal pairwise ranking dataset and throws an error if the dataset is malformed or disconnected. **Compilation flags:** `static` **Template:** `validate_temporal_pairwise_dataset(Dataset)` **Mode and number of proofs:** `validate_temporal_pairwise_dataset(+object_identifier)` - `one` ------------------------------------------------------------------------ ###### `validate_temporal_pairwise_dataset/2` Validates a temporal pairwise ranking dataset and returns its dataset summary when validation succeeds. **Compilation flags:** `static` **Template:** `validate_temporal_pairwise_dataset(Dataset,Summary)` **Mode and number of proofs:** `validate_temporal_pairwise_dataset(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `validate_grouped_dataset/2` Validates a grouped ranking dataset and returns its dataset summary when validation succeeds. **Compilation flags:** `static` **Template:** `validate_grouped_dataset(Dataset,Summary)` **Mode and number of proofs:** `validate_grouped_dataset(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates ###### `grouped_dataset_item_relevances/4` Collects the declared items for a grouped-dataset group paired with their relevance values under the given missing-relevance policy. **Compilation flags:** `static` **Template:** `grouped_dataset_item_relevances(Dataset,Group,MissingRelevance,ItemRelevances)` **Mode and number of proofs:** `grouped_dataset_item_relevances(+object_identifier,+term,+atom,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `grouped_dataset_relevance_frequencies/2` Aggregates grouped item relevances into a relevance-frequency dictionary. **Compilation flags:** `static` **Template:** `grouped_dataset_relevance_frequencies(ItemRelevances,FrequencyDictionary)` **Mode and number of proofs:** `grouped_dataset_relevance_frequencies(+list(pair),-compound)` - `one` ------------------------------------------------------------------------ ###### `grouped_dataset_item_relevance_scores/3` Maps grouped item relevances to per-item score deltas using a relevance-points dictionary. **Compilation flags:** `static` **Template:** `grouped_dataset_item_relevance_scores(ItemRelevances,PointsDictionary,ItemScores)` **Mode and number of proofs:** `grouped_dataset_item_relevance_scores(+list(pair),+compound,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `grouped_dataset_tie_blocks/4` Collects grouped-dataset item relevances into descending relevance tie blocks represented as `tie_block(Relevance,`` ``Items)` terms, preserving the declaration order of items inside each block. **Compilation flags:** `static` **Template:** `grouped_dataset_tie_blocks(Dataset,Group,MissingRelevance,TieBlocks)` **Mode and number of proofs:** `grouped_dataset_tie_blocks(+object_identifier,+term,+atom,-list(compound))` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `ranking_dataset_protocol` Protocol for grouped ranking datasets. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-16 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `group/1` - `item/2` - `relevance/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `group/1` Enumerates by backtracking the ranking groups or contexts in the dataset. **Compilation flags:** `static` **Template:** `group(Group)` **Mode and number of proofs:** `group(-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `item/2` Enumerates by backtracking the items available inside each ranking group or context. **Compilation flags:** `static` **Template:** `item(Group,Item)` **Mode and number of proofs:** `item(+atom,-atom)` - `zero_or_more` `item(-atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `relevance/3` Enumerates by backtracking the non-negative integer relevance judgments associated with each group and item. **Compilation flags:** `static` **Template:** `relevance(Group,Item,Relevance)` **Mode and number of proofs:** `relevance(+atom,+atom,-integer)` - `zero_or_more` `relevance(-atom,-atom,-integer)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `score_ranker_common` Shared predicates for score-based rankers that order candidates using precomputed item scores. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-25 **Compilation flags:** `static` **Extends:** `public` ranker_common **Uses:** avltree list pairs **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_ranker/1  rank/3  ranker_options/2  scores/2  valid_option/1  valid_options/1  valid_ranker/1 - Public predicates - Protected predicates - `rank_by_scores/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `rank_by_scores/3` Ranks candidates using precomputed `Item-Score` pairs while validating item existence and duplicate candidates. **Compilation flags:** `static` **Template:** `rank_by_scores(Scores,Candidates,Ranking)` **Mode and number of proofs:** `rank_by_scores(+list(pair),+list,-list)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `score_ranker_model_common` Shared predicates for score-ranker term construction, validation, ranking, export, and pretty-printing. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-27 **Compilation flags:** `static` **Extends:** `public` score_ranker_common **Uses:** avltree format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  print_ranker/1  rank/3  ranker_options/2  scores/2  valid_option/1  valid_options/1  valid_ranker/1 - Public predicates - Protected predicates - `score_ranker_model/1` - `score_ranker_label/1` - `score_ranker_term/4` - `valid_score/1` - `build_score_ranker/5` - `score_ranker_data/4` - `valid_score_ranker_diagnostics/3` - `initialize_scores/2` - `accumulate_item_scores/3` - `update_score/4` - `ordered_scores/3` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `score_ranker_model/1` Hook predicate that importing rankers must define to identify the learned score-ranker model. **Compilation flags:** `static` **Template:** `score_ranker_model(Model)` **Mode and number of proofs:** `score_ranker_model(-atom)` - `one` ------------------------------------------------------------------------ ###### `score_ranker_label/1` Hook predicate that importing rankers must define to provide a human-readable label used by pretty-printing helpers. **Compilation flags:** `static` **Template:** `score_ranker_label(Label)` **Mode and number of proofs:** `score_ranker_label(-atom)` - `one` ------------------------------------------------------------------------ ###### `score_ranker_term/4` Hook predicate that importing rankers must define to map between the ranker term representation and its items, scores, and diagnostics payloads. **Compilation flags:** `static` **Template:** `score_ranker_term(Items,Scores,Diagnostics,Ranker)` **Mode and number of proofs:** `score_ranker_term(?list,?list,?list(compound),?compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_score/1` Hook predicate that importing rankers must define to validate individual learned score values. **Compilation flags:** `static` **Template:** `valid_score(Score)` **Mode and number of proofs:** `valid_score(+number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `build_score_ranker/5` Builds a self-describing score-ranker term from ordered items, score pairs, effective options, and dataset summary metadata. **Compilation flags:** `static` **Template:** `build_score_ranker(Items,Scores,Options,DatasetSummary,Ranker)` **Mode and number of proofs:** `build_score_ranker(+list,+list(pair),+list(compound),+list(compound),-compound)` - `one` ------------------------------------------------------------------------ ###### `score_ranker_data/4` Validates and destructures a score-ranker term into its items, score pairs, and diagnostics payloads. **Compilation flags:** `static` **Template:** `score_ranker_data(Ranker,Items,Scores,Diagnostics)` **Mode and number of proofs:** `score_ranker_data(+compound,-list,-list(pair),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `valid_score_ranker_diagnostics/3` Hook predicate that importing rankers can define to validate diagnostics beyond the common model, options, and dataset summary metadata. **Compilation flags:** `static` **Template:** `valid_score_ranker_diagnostics(Items,Scores,Diagnostics)` **Mode and number of proofs:** `valid_score_ranker_diagnostics(+list,+list(pair),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `initialize_scores/2` Initializes a score dictionary with zero scores for the given ordered items. **Compilation flags:** `static` **Template:** `initialize_scores(Items,Scores)` **Mode and number of proofs:** `initialize_scores(+list,-compound)` - `one` ------------------------------------------------------------------------ ###### `accumulate_item_scores/3` Accumulates item score deltas into a score dictionary. **Compilation flags:** `static` **Template:** `accumulate_item_scores(ItemDeltas,Scores,UpdatedScores)` **Mode and number of proofs:** `accumulate_item_scores(+list(pair),+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `update_score/4` Updates the score of a single item in a score dictionary by adding the given delta. **Compilation flags:** `static` **Template:** `update_score(Scores,Item,Delta,UpdatedScores)` **Mode and number of proofs:** `update_score(+compound,+term,+number,-compound)` - `one` ------------------------------------------------------------------------ ###### `ordered_scores/3` Materializes ordered `Item-Score` pairs from a score dictionary using the given item order. **Compilation flags:** `static` **Template:** `ordered_scores(Items,ScoresDictionary,Scores)` **Mode and number of proofs:** `ordered_scores(+list,+compound,-list(pair))` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `temporal_pairwise_ranking_dataset_protocol` Protocol for temporal pairwise ranking datasets with explicit rating periods and per-game outcomes. **Availability:** `logtalk_load(ranking_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `item/1` - `period/1` - `game/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `item/1` Enumerates by backtracking the items that can be ranked. **Compilation flags:** `static` **Template:** `item(Item)` **Mode and number of proofs:** `item(-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `period/1` Enumerates by backtracking the rating periods in declaration order. **Compilation flags:** `static` **Template:** `period(Period)` **Mode and number of proofs:** `period(-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `game/4` Enumerates by backtracking observed games where `Score` is the result for `Item1` against `Item2` in the given `Period`. **Compilation flags:** `static` **Template:** `game(Period,Item1,Item2,Score)` **Mode and number of proofs:** `game(-atom,-atom,-atom,-number)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### reader") **object** #### `reader` Predicates for reading text file and text stream contents to lists of terms, characters, or character codes and for reading binary file and binary stream contents to lists of bytes. **Availability:** `logtalk_load(reader(loader))` **Author:** Paulo Moura **Version:** 2:3:0 **Date:** 2026-05-19 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `file_to_codes/2` - `file_to_codes/3` - `file_to_chars/2` - `file_to_chars/3` - `file_to_terms/2` - `file_to_terms/3` - `file_to_bytes/2` - `file_to_bytes/3` - `stream_to_codes/2` - `stream_to_codes/3` - `stream_to_chars/2` - `stream_to_chars/3` - `stream_to_terms/2` - `stream_to_terms/3` - `stream_to_bytes/2` - `stream_to_bytes/3` - `line_to_chars/2` - `line_to_chars/3` - `line_to_codes/2` - `line_to_codes/3` - `line_to_bytes/2` - `line_to_bytes/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `file_to_codes/2` Reads a text file into a list of character codes. **Compilation flags:** `static` **Template:** `file_to_codes(File,Codes)` **Mode and number of proofs:** `file_to_codes(+atom,-list(character_code))` - `one` ------------------------------------------------------------------------ ###### `file_to_codes/3` Reads a text file into a list of character codes. The list is terminated by the given tail. **Compilation flags:** `static` **Template:** `file_to_codes(File,Codes,Tail)` **Mode and number of proofs:** `file_to_codes(+atom,-list(character_code),@term)` - `one` ------------------------------------------------------------------------ ###### `file_to_chars/2` Reads a text file into a list of characters. **Compilation flags:** `static` **Template:** `file_to_chars(File,Chars)` **Mode and number of proofs:** `file_to_chars(+atom,-list(character))` - `one` ------------------------------------------------------------------------ ###### `file_to_chars/3` Reads a text file into a list of characters. The list is terminated by the given tail. **Compilation flags:** `static` **Template:** `file_to_chars(File,Chars,Tail)` **Mode and number of proofs:** `file_to_chars(+atom,-list(character),@term)` - `one` ------------------------------------------------------------------------ ###### `file_to_terms/2` Reads a text file into a list of terms. **Compilation flags:** `static` **Template:** `file_to_terms(File,Terms)` **Mode and number of proofs:** `file_to_terms(+atom,-list(term))` - `one` ------------------------------------------------------------------------ ###### `file_to_terms/3` Reads a text file into a list of terms. The list is terminated by the given tail. **Compilation flags:** `static` **Template:** `file_to_terms(File,Terms,Tail)` **Mode and number of proofs:** `file_to_terms(+atom,-list(term),@term)` - `one` ------------------------------------------------------------------------ ###### `file_to_bytes/2` Reads a binary file into a list of bytes. **Compilation flags:** `static` **Template:** `file_to_bytes(File,Bytes)` **Mode and number of proofs:** `file_to_bytes(+atom,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `file_to_bytes/3` Reads a binary file into a list of bytes. The list is terminated by the given tail. **Compilation flags:** `static` **Template:** `file_to_bytes(File,Bytes,Tail)` **Mode and number of proofs:** `file_to_bytes(+atom,-list(byte),@term)` - `one` ------------------------------------------------------------------------ ###### `stream_to_codes/2` Reads a text stream into a list of character codes. Does not close the stream. **Compilation flags:** `static` **Template:** `stream_to_codes(Stream,Codes)` **Mode and number of proofs:** `stream_to_codes(+stream_or_alias,-list(character_code))` - `one` ------------------------------------------------------------------------ ###### `stream_to_codes/3` Reads a text stream into a list of character codes. Does not close the stream. The list is terminated by the given tail. **Compilation flags:** `static` **Template:** `stream_to_codes(Stream,Codes,Tail)` **Mode and number of proofs:** `stream_to_codes(+stream_or_alias,-list(character_code),@term)` - `one` ------------------------------------------------------------------------ ###### `stream_to_chars/2` Reads a text stream into a list of characters. Does not close the stream. **Compilation flags:** `static` **Template:** `stream_to_chars(Stream,Chars)` **Mode and number of proofs:** `stream_to_chars(+stream_or_alias,-list(char))` - `one` ------------------------------------------------------------------------ ###### `stream_to_chars/3` Reads a text stream into a list of characters. Does not close the stream. The list is terminated by the given tail. **Compilation flags:** `static` **Template:** `stream_to_chars(Stream,Chars,Tail)` **Mode and number of proofs:** `stream_to_chars(+stream_or_alias,-list(char),@term)` - `one` ------------------------------------------------------------------------ ###### `stream_to_terms/2` Reads a text stream into a list of terms. Does not close the stream. **Compilation flags:** `static` **Template:** `stream_to_terms(Stream,Terms)` **Mode and number of proofs:** `stream_to_terms(+stream_or_alias,-list(term))` - `one` ------------------------------------------------------------------------ ###### `stream_to_terms/3` Reads a text stream into a list of terms. Does not close the stream. The list is terminated by the given tail. **Compilation flags:** `static` **Template:** `stream_to_terms(Stream,Terms,Tail)` **Mode and number of proofs:** `stream_to_terms(+stream_or_alias,-list(term),@term)` - `one` ------------------------------------------------------------------------ ###### `stream_to_bytes/2` Reads a binary stream into a list of bytes. Does not close the stream. **Compilation flags:** `static` **Template:** `stream_to_bytes(Stream,Bytes)` **Mode and number of proofs:** `stream_to_bytes(+stream_or_alias,-list(byte))` - `one` ------------------------------------------------------------------------ ###### `stream_to_bytes/3` Reads a binary stream into a list of bytes. Does not close the stream. The list is terminated by the given tail. **Compilation flags:** `static` **Template:** `stream_to_bytes(Stream,Bytes,Tail)` **Mode and number of proofs:** `stream_to_bytes(+stream_or_alias,-list(byte),@term)` - `one` ------------------------------------------------------------------------ ###### `line_to_chars/2` Reads a line from a text stream into a list of characters. Discards the end-of-line characters. Unifies `Chars` with `end_of_file` at the end of the file. **Compilation flags:** `static` **Template:** `line_to_chars(Stream,Chars)` **Mode and number of proofs:** `line_to_chars(+stream_or_alias,-types([atom,list(character)]))` - `one` ------------------------------------------------------------------------ ###### `line_to_chars/3` Reads a line from a text stream into a list of characters. Keeps the end-of-line marker normalized to the line feed control character. The list is terminated by the given tail, which is unified with the empty list at the end of the file. **Compilation flags:** `static` **Template:** `line_to_chars(Stream,Chars,Tail)` **Mode and number of proofs:** `line_to_chars(+stream_or_alias,-list(character),?term)` - `one` ------------------------------------------------------------------------ ###### `line_to_codes/2` Reads a line from a text stream into a list of character codes. Discards the end-of-line character codes. Unifies `Codes` with `end_of_file` at the end of the file. **Compilation flags:** `static` **Template:** `line_to_codes(Stream,Codes)` **Mode and number of proofs:** `line_to_codes(+stream_or_alias,-types([atom,list(character_code)]))` - `one` ------------------------------------------------------------------------ ###### `line_to_codes/3` Reads a line from a text stream into a list of character codes. Keeps the end-of-line marker normalized to the line feed control character code. The list is terminated by the given tail, which is unified with the empty list at the end of the file. **Compilation flags:** `static` **Template:** `line_to_codes(Stream,Codes,Tail)` **Mode and number of proofs:** `line_to_codes(+stream_or_alias,-list(character_code),?term)` - `one` ------------------------------------------------------------------------ ###### `line_to_bytes/2` Reads a line from a binary stream into a list of bytes. Discards the end-of-line bytes. Unifies `Bytes` with `end_of_file` at the end of the file. **Compilation flags:** `static` **Template:** `line_to_bytes(Stream,Bytes)` **Mode and number of proofs:** `line_to_bytes(+stream_or_alias,-types([atom,list(byte)]))` - `one` ------------------------------------------------------------------------ ###### `line_to_bytes/3` Reads a line from a binary stream into a list of bytes. Keeps the end-of-line marker normalized to the line feed control byte. The list is terminated by the given tail, which is unified with the empty list at the end of the file. **Compilation flags:** `static` **Template:** `line_to_bytes(Stream,Bytes,Tail)` **Mode and number of proofs:** `line_to_bytes(+stream_or_alias,-list(byte),?term)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### recorded_database") **object** #### `recorded_database` Legacy recorded database predicates. Provides an application global database. **Availability:** `logtalk_load(recorded_database(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2023-12-17 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` recorded_database_core **Remarks:** (none) **Inherited public predicates:**  erase/1  instance/2  recorda/2  recorda/3  recorded/2  recorded/3  recordz/2  recordz/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `recorded_database_core` Legacy recorded database predicates. Can be imported into an object to provide a local database. **Availability:** `logtalk_load(recorded_database(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2023-12-17 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - References: Opaque ground terms. **Inherited public predicates:** (none) - Public predicates - `recorda/3` - `recorda/2` - `recordz/3` - `recordz/2` - `recorded/3` - `recorded/2` - `erase/1` - `instance/2` - Protected predicates - Private predicates - `record_/3` - `reference_/1` - Operators ##### Public predicates ###### `recorda/3` Adds a term as the first term for the given key, returning its reference. **Compilation flags:** `static` **Template:** `recorda(Key,Term,Reference)` **Mode and number of proofs:** `recorda(+recorded_database_key,+term,--recorded_database_reference)` - `one_or_error` **Exceptions:** `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atomic term or compound term: `type_error(recorded_database_key,Key)` `Reference` is a not a variable: `uninstantiation_error(Reference)` ------------------------------------------------------------------------ ###### `recorda/2` Adds a term as the first term for the given key. **Compilation flags:** `static` **Template:** `recorda(Key,Term)` **Mode and number of proofs:** `recorda(+recorded_database_key,+term)` - `one_or_error` **Exceptions:** `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atomic term or compound term: `type_error(recorded_database_key,Key)` ------------------------------------------------------------------------ ###### `recordz/3` Adds a term as the last term for the given key, returning its reference. **Compilation flags:** `static` **Template:** `recordz(Key,Term,Reference)` **Mode and number of proofs:** `recordz(+recorded_database_key,+term,--recorded_database_reference)` - `one_or_error` **Exceptions:** `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atomic term or compound term: `type_error(recorded_database_key,Key)` `Reference` is a not a variable: `uninstantiation_error(Reference)` ------------------------------------------------------------------------ ###### `recordz/2` Adds a term as the last term for the given key. **Compilation flags:** `static` **Template:** `recordz(Key,Term)` **Mode and number of proofs:** `recordz(+recorded_database_key,+term)` - `one_or_error` **Exceptions:** `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atomic term or compound term: `type_error(recorded_database_key,Key)` ------------------------------------------------------------------------ ###### `recorded/3` Enumerates, by backtracking, all record key-term pairs and their references. **Compilation flags:** `static` **Template:** `recorded(Key,Term,Reference)` **Mode and number of proofs:** `recorded(?recorded_database_key,?term,-recorded_database_reference)` - `zero_or_more` `recorded(?recorded_database_key,?term,+recorded_database_reference)` - `zero_or_one` ------------------------------------------------------------------------ ###### `recorded/2` Enumerates, by backtracking, all record key-term pairs. **Compilation flags:** `static` **Template:** `recorded(Key,Term)` **Mode and number of proofs:** `recorded(?recorded_database_key,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `erase/1` Erases the record indexed by the given reference. Fails if there is no record with the given reference. **Compilation flags:** `static` **Template:** `erase(Reference)` **Mode and number of proofs:** `erase(@recorded_database_reference)` - `zero_or_one_or_error` **Exceptions:** `Reference` is a variable: `instantiation_error` ------------------------------------------------------------------------ ###### `instance/2` . **Compilation flags:** `static` **Template:** `instance(Reference,Term)` **Mode and number of proofs:** `instance(@recorded_database_reference,?term)` - `zero_or_one_or_error` **Exceptions:** `Reference` is a variable: `instantiation_error` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates ###### `record_/3` Records table. **Compilation flags:** `dynamic` **Template:** `record_(Key,Term,Reference)` **Mode and number of proofs:** `record_(?recorded_database_key,?term,?recorded_database_reference)` - `zero_or_more` ------------------------------------------------------------------------ ###### `reference_/1` Reference count. **Compilation flags:** `dynamic` **Template:** `reference_(Reference)` **Mode and number of proofs:** `reference_(?non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) ### redis") **object** #### `redis` Redis client library with support for strings, keys, hashes, lists, sets, and sorted sets. Inspired by Sean Charles GNU Prolog Redis client. **Availability:** `logtalk_load(redis(loader))` **Author:** Paulo Moura **Version:** 0:7:0 **Date:** 2026-02-10 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** logtalk::message_tokens//2 **Uses:** list logtalk socket **Remarks:** > - Command representation: Use the Redis command name as the functor of a compound term where the arguments are the command arguments. > > - Valid arguments: Atoms, integers, and floats. Always use atoms instead of double-quoted “strings”. This helps portability by not depending on the value of the `double_quotes` flag. > > - Wrapper predicates: The library provides convenient wrapper predicates for common Redis operations. For operations without a wrapper, use the generic `send/3` predicate. **Inherited public predicates:** (none) - Public predicates - `connect/1` - `connect/3` - `disconnect/1` - `send/3` - `console/1` - `get/3` - `set/4` - `append/4` - `getrange/5` - `setrange/5` - `strlen/3` - `mget/3` - `mset/3` - `incr/3` - `decr/3` - `incrby/4` - `decrby/4` - `del/3` - `exists/3` - `keys/3` - `ttl/3` - `expire/4` - `persist/3` - `rename/4` - `type/3` - `hset/5` - `hget/4` - `hgetall/3` - `hdel/4` - `hexists/4` - `hkeys/3` - `hvals/3` - `hlen/3` - `lpush/4` - `rpush/4` - `lpop/3` - `rpop/3` - `lrange/5` - `llen/3` - `lrem/5` - `ltrim/5` - `sadd/4` - `srem/4` - `smembers/3` - `sismember/4` - `scard/3` - `zadd/5` - `zrem/4` - `zrange/5` - `zrank/4` - `zcard/3` - `zscore/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `connect/1` Connect to a Redis server running on localhost using the default 6379 port. **Compilation flags:** `static` **Template:** `connect(Connection)` **Mode and number of proofs:** `connect(--ground)` - `one` ------------------------------------------------------------------------ ###### `connect/3` Connect to a Redis server running on the given host and port. **Compilation flags:** `static` **Template:** `connect(Host,Port,Connection)` **Mode and number of proofs:** `connect(+atom,+integer,--ground)` - `one` ------------------------------------------------------------------------ ###### `disconnect/1` Disconnect from a Redis server. **Compilation flags:** `static` **Template:** `disconnect(Connection)` **Mode and number of proofs:** `disconnect(++ground)` - `one` ------------------------------------------------------------------------ ###### `send/3` Sends a request to the a Redis server and returns its reply. **Compilation flags:** `static` **Template:** `send(Connection,Request,Reply)` **Mode and number of proofs:** `send(++ground,++callable,--callable)` - `one` ------------------------------------------------------------------------ ###### `console/1` Sends a request to a Redis server running on localhost at the default 6379 port and prints the reply. **Compilation flags:** `static` **Template:** `console(Request)` **Mode and number of proofs:** `console(++callable)` - `one` ------------------------------------------------------------------------ ###### `get/3` Gets the value of a key. **Compilation flags:** `static` **Template:** `get(Connection,Key,Value)` **Mode and number of proofs:** `get(+ground,+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `set/4` Sets the value of a key. **Compilation flags:** `static` **Template:** `set(Connection,Key,Value,Status)` **Mode and number of proofs:** `set(+ground,+atom,+ground,-atom)` - `one` ------------------------------------------------------------------------ ###### `append/4` Appends a value to a key. Returns the length of the string after the append. **Compilation flags:** `static` **Template:** `append(Connection,Key,Value,Length)` **Mode and number of proofs:** `append(+ground,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `getrange/5` Gets a substring of the string stored at a key. **Compilation flags:** `static` **Template:** `getrange(Connection,Key,Start,End,Substring)` **Mode and number of proofs:** `getrange(+ground,+atom,+integer,+integer,-atom)` - `one` ------------------------------------------------------------------------ ###### `setrange/5` Overwrites part of a string at a key starting at the specified offset. Returns the length of the string after modification. **Compilation flags:** `static` **Template:** `setrange(Connection,Key,Offset,Value,Length)` **Mode and number of proofs:** `setrange(+ground,+atom,+integer,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `strlen/3` Gets the length of the value stored at a key. **Compilation flags:** `static` **Template:** `strlen(Connection,Key,Length)` **Mode and number of proofs:** `strlen(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `mget/3` Gets the values of multiple keys. Returns a list of values. **Compilation flags:** `static` **Template:** `mget(Connection,Keys,Values)` **Mode and number of proofs:** `mget(+ground,+list(atom),-list)` - `one` ------------------------------------------------------------------------ ###### `mset/3` Sets multiple key-value pairs. Pairs should be provided as a flat list \[Key1, Value1, Key2, Value2, …\]. **Compilation flags:** `static` **Template:** `mset(Connection,Pairs,Status)` **Mode and number of proofs:** `mset(+ground,+list,-atom)` - `one` ------------------------------------------------------------------------ ###### `incr/3` Increments the integer value of a key by one. Returns the value after increment. **Compilation flags:** `static` **Template:** `incr(Connection,Key,Value)` **Mode and number of proofs:** `incr(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `decr/3` Decrements the integer value of a key by one. Returns the value after decrement. **Compilation flags:** `static` **Template:** `decr(Connection,Key,Value)` **Mode and number of proofs:** `decr(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `incrby/4` Increments the integer value of a key by the specified amount. Returns the value after increment. **Compilation flags:** `static` **Template:** `incrby(Connection,Key,Increment,Value)` **Mode and number of proofs:** `incrby(+ground,+atom,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `decrby/4` Decrements the integer value of a key by the specified amount. Returns the value after decrement. **Compilation flags:** `static` **Template:** `decrby(Connection,Key,Decrement,Value)` **Mode and number of proofs:** `decrby(+ground,+atom,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `del/3` Deletes a key. Returns the number of keys removed. **Compilation flags:** `static` **Template:** `del(Connection,Key,Count)` **Mode and number of proofs:** `del(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `exists/3` Checks if a key exists. Returns 1 if the key exists, 0 otherwise. **Compilation flags:** `static` **Template:** `exists(Connection,Key,Exists)` **Mode and number of proofs:** `exists(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `keys/3` Finds all keys matching a pattern. Returns a list of keys. **Compilation flags:** `static` **Template:** `keys(Connection,Pattern,Keys)` **Mode and number of proofs:** `keys(+ground,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `ttl/3` Gets the time to live for a key in seconds. Returns -1 if the key has no expiry, -2 if the key does not exist. **Compilation flags:** `static` **Template:** `ttl(Connection,Key,Seconds)` **Mode and number of proofs:** `ttl(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `expire/4` Sets a timeout on a key in seconds. Returns 1 if the timeout was set, 0 if the key does not exist. **Compilation flags:** `static` **Template:** `expire(Connection,Key,Seconds,Result)` **Mode and number of proofs:** `expire(+ground,+atom,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `persist/3` Removes the expiration from a key. Returns 1 if the timeout was removed, 0 if the key does not exist or has no timeout. **Compilation flags:** `static` **Template:** `persist(Connection,Key,Result)` **Mode and number of proofs:** `persist(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `rename/4` Renames a key. Returns status OK or error if the key does not exist. **Compilation flags:** `static` **Template:** `rename(Connection,OldKey,NewKey,Status)` **Mode and number of proofs:** `rename(+ground,+atom,+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `type/3` Gets the type of the value stored at a key. Returns one of: string, list, set, zset, hash, stream, none. **Compilation flags:** `static` **Template:** `type(Connection,Key,Type)` **Mode and number of proofs:** `type(+ground,+atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `hset/5` Sets a field in a hash. Returns 1 if a new field was created, 0 if the field was updated. **Compilation flags:** `static` **Template:** `hset(Connection,Key,Field,Value,Result)` **Mode and number of proofs:** `hset(+ground,+atom,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `hget/4` Gets the value of a field in a hash. **Compilation flags:** `static` **Template:** `hget(Connection,Key,Field,Value)` **Mode and number of proofs:** `hget(+ground,+atom,+atom,-ground)` - `one` ------------------------------------------------------------------------ ###### `hgetall/3` Gets all fields and values in a hash. Returns a flat list of alternating fields and values. **Compilation flags:** `static` **Template:** `hgetall(Connection,Key,FieldsValues)` **Mode and number of proofs:** `hgetall(+ground,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `hdel/4` Deletes a field from a hash. Returns the number of fields removed. **Compilation flags:** `static` **Template:** `hdel(Connection,Key,Field,Count)` **Mode and number of proofs:** `hdel(+ground,+atom,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `hexists/4` Checks if a field exists in a hash. Returns 1 if the field exists, 0 otherwise. **Compilation flags:** `static` **Template:** `hexists(Connection,Key,Field,Exists)` **Mode and number of proofs:** `hexists(+ground,+atom,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `hkeys/3` Gets all field names in a hash. **Compilation flags:** `static` **Template:** `hkeys(Connection,Key,Fields)` **Mode and number of proofs:** `hkeys(+ground,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `hvals/3` Gets all values in a hash. **Compilation flags:** `static` **Template:** `hvals(Connection,Key,Values)` **Mode and number of proofs:** `hvals(+ground,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `hlen/3` Gets the number of fields in a hash. **Compilation flags:** `static` **Template:** `hlen(Connection,Key,Count)` **Mode and number of proofs:** `hlen(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `lpush/4` Prepends a value to a list. Returns the length of the list after the push. **Compilation flags:** `static` **Template:** `lpush(Connection,Key,Value,Length)` **Mode and number of proofs:** `lpush(+ground,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `rpush/4` Appends a value to a list. Returns the length of the list after the push. **Compilation flags:** `static` **Template:** `rpush(Connection,Key,Value,Length)` **Mode and number of proofs:** `rpush(+ground,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `lpop/3` Removes and returns the first element of a list. **Compilation flags:** `static` **Template:** `lpop(Connection,Key,Value)` **Mode and number of proofs:** `lpop(+ground,+atom,-ground)` - `one` ------------------------------------------------------------------------ ###### `rpop/3` Removes and returns the last element of a list. **Compilation flags:** `static` **Template:** `rpop(Connection,Key,Value)` **Mode and number of proofs:** `rpop(+ground,+atom,-ground)` - `one` ------------------------------------------------------------------------ ###### `lrange/5` Gets a range of elements from a list. Indices are zero-based. **Compilation flags:** `static` **Template:** `lrange(Connection,Key,Start,Stop,Elements)` **Mode and number of proofs:** `lrange(+ground,+atom,+integer,+integer,-list)` - `one` ------------------------------------------------------------------------ ###### `llen/3` Gets the length of a list. **Compilation flags:** `static` **Template:** `llen(Connection,Key,Length)` **Mode and number of proofs:** `llen(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `lrem/5` Removes elements from a list. Count \> 0: remove from head, Count \< 0: remove from tail, Count = 0: remove all. Returns the number of removed elements. **Compilation flags:** `static` **Template:** `lrem(Connection,Key,Count,Value,Removed)` **Mode and number of proofs:** `lrem(+ground,+atom,+integer,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `ltrim/5` Trims a list to the specified range. **Compilation flags:** `static` **Template:** `ltrim(Connection,Key,Start,Stop,Status)` **Mode and number of proofs:** `ltrim(+ground,+atom,+integer,+integer,-atom)` - `one` ------------------------------------------------------------------------ ###### `sadd/4` Adds a member to a set. Returns the number of elements added. **Compilation flags:** `static` **Template:** `sadd(Connection,Key,Member,Count)` **Mode and number of proofs:** `sadd(+ground,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `srem/4` Removes a member from a set. Returns the number of elements removed. **Compilation flags:** `static` **Template:** `srem(Connection,Key,Member,Count)` **Mode and number of proofs:** `srem(+ground,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `smembers/3` Gets all members in a set. **Compilation flags:** `static` **Template:** `smembers(Connection,Key,Members)` **Mode and number of proofs:** `smembers(+ground,+atom,-list)` - `one` ------------------------------------------------------------------------ ###### `sismember/4` Checks if a value is a member of a set. Returns 1 if the member exists, 0 otherwise. **Compilation flags:** `static` **Template:** `sismember(Connection,Key,Member,IsMember)` **Mode and number of proofs:** `sismember(+ground,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `scard/3` Gets the number of members in a set. **Compilation flags:** `static` **Template:** `scard(Connection,Key,Count)` **Mode and number of proofs:** `scard(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `zadd/5` Adds a member with a score to a sorted set. Returns the number of elements added. **Compilation flags:** `static` **Template:** `zadd(Connection,Key,Score,Member,Count)` **Mode and number of proofs:** `zadd(+ground,+atom,+number,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `zrem/4` Removes a member from a sorted set. Returns the number of elements removed. **Compilation flags:** `static` **Template:** `zrem(Connection,Key,Member,Count)` **Mode and number of proofs:** `zrem(+ground,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `zrange/5` Gets a range of members from a sorted set, ordered from lowest to highest score. **Compilation flags:** `static` **Template:** `zrange(Connection,Key,Start,Stop,Members)` **Mode and number of proofs:** `zrange(+ground,+atom,+integer,+integer,-list)` - `one` ------------------------------------------------------------------------ ###### `zrank/4` Gets the rank (index) of a member in a sorted set, ordered from lowest to highest score. Returns nil if the member does not exist. **Compilation flags:** `static` **Template:** `zrank(Connection,Key,Member,Rank)` **Mode and number of proofs:** `zrank(+ground,+atom,+ground,-integer)` - `one` ------------------------------------------------------------------------ ###### `zcard/3` Gets the number of members in a sorted set. **Compilation flags:** `static` **Template:** `zcard(Connection,Key,Count)` **Mode and number of proofs:** `zcard(+ground,+atom,-integer)` - `one` ------------------------------------------------------------------------ ###### `zscore/4` Gets the score of a member in a sorted set. **Compilation flags:** `static` **Template:** `zscore(Connection,Key,Member,Score)` **Mode and number of proofs:** `zscore(+ground,+atom,+ground,-ground)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### regression_protocols") **protocol** #### `regression_dataset_protocol` Protocol for datasets used with regression algorithms. **Availability:** `logtalk_load(regression_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-21 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `attribute_values/2` - `target/1` - `example/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `attribute_values/2` Enumerates by backtracking the attributes and their possible values. For discrete attributes, `Values` is a list of possible values. For continuous (numeric) attributes, `Values` is the atom `continuous`. **Compilation flags:** `static` **Template:** `attribute_values(Attribute,Values)` **Mode and number of proofs:** `attribute_values(?atom,-list(atom))` - `zero_or_more` `attribute_values(?atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `target/1` Returns the name of the numeric target attribute. **Compilation flags:** `static` **Template:** `target(Target)` **Mode and number of proofs:** `target(-atom)` - `one` ------------------------------------------------------------------------ ###### `example/3` Enumerates by backtracking the examples in the dataset. Each example has an `Id`, a numeric `Target` value, and a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `example(Id,Target,AttributeValues)` **Mode and number of proofs:** `example(-integer,-number,-list(pair))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `regressor_common` Shared predicates for regressor learning defaults, diagnostics, validation, dataset validation, export, and pretty-print helpers. **Availability:** `logtalk_load(regression_protocols(loader))` **Author:** Paulo Moura **Version:** 1:1:1 **Date:** 2026-06-14 **Compilation flags:** `static` **Implements:** `public` regressor_protocol **Extends:** `public` options **Uses:** format linear_algebra list numberlist population type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - `regressor_diagnostics_data/2` - `regressor_export_template/4` - `regressor_term_template/2` - `dataset_attributes/2` - `dataset_examples/2` - `check_examples/2` - `print_regressor_template/1` - `base_regressor_diagnostics/6` - `valid_attribute_names/1` - `valid_attribute_declarations/1` - `valid_discrete_values/1` - `valid_regression_encoders/1` - `valid_regressor_options/1` - `valid_regressor_metadata/2` - `valid_diagnostic_count/3` - `valid_linear_model_diagnostics/1` - `valid_encoded_rows/2` - `encoded_feature_count/2` - `continuous_stats/5` - `examples_to_rows/3` - `encode_instance/3` - `fit_linear_model/7` - `fit_ridge_model/7` - `valid_feature_labels/1` - `valid_regression_tree/2` - Private predicates - `check_attribute_declarations/1` - `known_attribute_values/3` - `check_attribute_bindings/2` - `check_declared_attribute_bindings/2` - `check_undeclared_attribute_bindings/2` - `attribute_occurrences/4` - `declared_attribute_names/2` - `encoder_attribute_names/2` - `encode_instance_checked/3` - `valid_linear_model_convergence/1` - `normalize_continuous/4` - `check_categorical_value/3` - `one_hot_encode/4` - `missing_one_hot_encode/3` - `zero_vector_from_values/3` - `build_linear_encoders/4` - `train_linear_model/6` - `rows_to_design_matrix/3` - `residual_sum_of_squares/4` - `train_ridge_model/6` - `ridge_feature_statistics/3` - `accumulate_feature_statistics/5` - `add_squared_vector/3` - `feature_penalty_profiles/5` - `active_feature_count/2` - `compress_rows/3` - `compress_features/3` - `compress_vector/3` - `build_ridge_system/5` - `accumulate_ridge_system/5` - `add_outer_product/4` - `regularize_ridge_matrix/4` - `solve_linear_system/4` - `augment_rows/3` - `triangularize/2` - `select_pivot_row/3` - `leading_magnitude/2` - `ensure_non_zero/1` - `eliminate_rows/5` - `scaled_row_difference/4` - `back_substitution/2` - `maximum_linear_system_residual/4` - `expand_weights/3` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `regressor_diagnostics_data/2` Default hook predicate for exposing diagnostics metadata from a regressor term. Importing implementations may override it when using a non-standard regressor representation. **Compilation flags:** `static` **Template:** `regressor_diagnostics_data(Regressor,Diagnostics)` **Mode and number of proofs:** `regressor_diagnostics_data(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `regressor_export_template/4` Hook predicate that importing regressor implementations must define in order to expose the exported regressor template for a given functor. **Compilation flags:** `static` **Template:** `regressor_export_template(Dataset,Regressor,Functor,Template)` **Mode and number of proofs:** `regressor_export_template(+object_identifier,+compound,+atom,-callable)` - `one` ------------------------------------------------------------------------ ###### `regressor_term_template/2` Hook predicate that importing regressor implementations must define in order to expose the learned regressor term template used by pretty-printing helpers. **Compilation flags:** `static` **Template:** `regressor_term_template(Regressor,Template)` **Mode and number of proofs:** `regressor_term_template(+compound,-callable)` - `one` ------------------------------------------------------------------------ ###### `dataset_attributes/2` Collects the dataset attribute declarations as Attribute-Values pairs. **Compilation flags:** `static` **Template:** `dataset_attributes(Dataset,Attributes)` **Mode and number of proofs:** `dataset_attributes(+object_identifier,-list(pair))` - `one` ------------------------------------------------------------------------ ###### `dataset_examples/2` Collects the dataset examples as example(Id, TargetValue, AttributeValues) terms. **Compilation flags:** `static` **Template:** `dataset_examples(Dataset,Examples)` **Mode and number of proofs:** `dataset_examples(+object_identifier,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `check_examples/2` Validates that the collected examples list is non-empty, only contains numeric targets, and only uses declared attributes without duplicate bindings. **Compilation flags:** `static` **Template:** `check_examples(Dataset,Examples)` **Mode and number of proofs:** `check_examples(+object_identifier,+list)` - `one_or_error` **Exceptions:** Examples is the empty list: `domain_error(non_empty_dataset,Dataset)` An example target is not numeric: `type_error(number,Target)` An example repeats a declared attribute binding: `domain_error(attribute_occurrences,Attribute)` An example contains an undeclared attribute binding: `domain_error(declared_attribute,Attribute)` ------------------------------------------------------------------------ ###### `print_regressor_template/1` Pretty-printing helper predicate used by importing regressor implementations to show the learned regressor term template. **Compilation flags:** `static` **Template:** `print_regressor_template(Regressor)` **Mode and number of proofs:** `print_regressor_template(+compound)` - `one` ------------------------------------------------------------------------ ###### `base_regressor_diagnostics/6` Builds common diagnostics metadata terms for a learned regressor and appends regressor-specific diagnostics terms. **Compilation flags:** `static` **Template:** `base_regressor_diagnostics(Model,Target,TrainingExampleCount,Options,ExtraDiagnostics,Diagnostics)` **Mode and number of proofs:** `base_regressor_diagnostics(+atom,+atom,+integer,+list(compound),+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `valid_attribute_names/1` True when a list of attribute names is a proper list of distinct atoms. **Compilation flags:** `static` **Template:** `valid_attribute_names(AttributeNames)` **Mode and number of proofs:** `valid_attribute_names(+list(atom))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_attribute_declarations/1` True when a list of attribute declarations is a proper list of distinct `Attribute-Values` pairs where values are either `continuous` or a valid discrete value list. **Compilation flags:** `static` **Template:** `valid_attribute_declarations(Attributes)` **Mode and number of proofs:** `valid_attribute_declarations(+list(pair))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_discrete_values/1` True when a list of categorical values is non-empty, contains only nonvar terms, and has no duplicates. **Compilation flags:** `static` **Template:** `valid_discrete_values(Values)` **Mode and number of proofs:** `valid_discrete_values(+list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_regression_encoders/1` True when a list of encoders only contains valid `continuous/3` or `categorical/2` encoder terms with distinct attributes. **Compilation flags:** `static` **Template:** `valid_regression_encoders(Encoders)` **Mode and number of proofs:** `valid_regression_encoders(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_regressor_options/1` True when a list of options is structurally valid for the receiving regressor implementation. **Compilation flags:** `static` **Template:** `valid_regressor_options(Options)` **Mode and number of proofs:** `valid_regressor_options(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_regressor_metadata/2` True when diagnostics metadata contains the expected model term and records a structurally valid effective options list. **Compilation flags:** `static` **Template:** `valid_regressor_metadata(Model,Diagnostics)` **Mode and number of proofs:** `valid_regressor_metadata(+atom,+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_diagnostic_count/3` True when diagnostics contains a count term with the given functor and integer value. **Compilation flags:** `static` **Template:** `valid_diagnostic_count(Functor,Diagnostics,Count)` **Mode and number of proofs:** `valid_diagnostic_count(+atom,+list(compound),+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_linear_model_diagnostics/1` True when diagnostics contains structurally valid linear-model optimization metadata terms for convergence, completed iterations, and final parameter delta. **Compilation flags:** `static` **Template:** `valid_linear_model_diagnostics(Diagnostics)` **Mode and number of proofs:** `valid_linear_model_diagnostics(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_encoded_rows/2` True when encoded training rows match the feature count induced by the encoders and carry numeric targets. **Compilation flags:** `static` **Template:** `valid_encoded_rows(Encoders,Rows)` **Mode and number of proofs:** `valid_encoded_rows(+list(compound),+list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `encoded_feature_count/2` Counts the number of numeric features induced by a list of continuous and categorical encoders, including missing-value indicator features. **Compilation flags:** `static` **Template:** `encoded_feature_count(Encoders,FeatureCount)` **Mode and number of proofs:** `encoded_feature_count(+list(compound),-integer)` - `one` ------------------------------------------------------------------------ ###### `continuous_stats/5` Computes the mean and scaling factor used to encode a continuous attribute from the training examples according to the effective feature scaling option. **Compilation flags:** `static` **Template:** `continuous_stats(Attribute,Examples,Options,Mean,Scale)` **Mode and number of proofs:** `continuous_stats(+atom,+list(compound),+list(compound),-float,-positive_float)` - `one` ------------------------------------------------------------------------ ###### `examples_to_rows/3` Encodes dataset examples as numeric feature-vector and target pairs using a list of encoders. **Compilation flags:** `static` **Template:** `examples_to_rows(Examples,Encoders,Rows)` **Mode and number of proofs:** `examples_to_rows(+list(compound),+list(compound),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `encode_instance/3` Validates and encodes an attribute-value list as a numeric feature vector using a list of continuous and categorical encoders. **Compilation flags:** `static` **Template:** `encode_instance(Encoders,AttributeValues,Features)` **Mode and number of proofs:** `encode_instance(+list(compound),+list(pair),-list(float))` - `one` ------------------------------------------------------------------------ ###### `fit_linear_model/7` Builds linear-model encoders from the training dataset, encodes the examples, fits an ordinary least-squares bias plus weight vector using the linear_algebra least-squares solver, and returns solver diagnostics terms. **Compilation flags:** `static` **Template:** `fit_linear_model(Dataset,Options,Encoders,TrainingExampleCount,Bias,Weights,TrainingDiagnostics)` **Mode and number of proofs:** `fit_linear_model(+object_identifier,+list(compound),-list(compound),-integer,-float,-list(float),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `fit_ridge_model/7` Builds linear-model encoders from the training dataset, encodes the examples, fits a bias plus weight vector by solving the ridge normal equations with partial pivoting, and returns ridge-specific diagnostics terms. **Compilation flags:** `static` **Template:** `fit_ridge_model(Dataset,Options,Encoders,TrainingExampleCount,Bias,Weights,TrainingDiagnostics)` **Mode and number of proofs:** `fit_ridge_model(+object_identifier,+list(compound),-list(compound),-integer,-float,-list(float),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `valid_feature_labels/1` True when a list of regression-tree feature labels only contains valid `feature/2` terms. **Compilation flags:** `static` **Template:** `valid_feature_labels(FeatureLabels)` **Mode and number of proofs:** `valid_feature_labels(+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_regression_tree/2` True when a regression tree only contains valid `leaf/1` and `node/5` terms using feature indexes within bounds. **Compilation flags:** `static` **Template:** `valid_regression_tree(Tree,FeatureCount)` **Mode and number of proofs:** `valid_regression_tree(+compound,+positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates ###### `check_attribute_declarations/1` Checks that dataset attribute declarations use distinct attribute names and valid value domains. **Compilation flags:** `static` **Template:** `check_attribute_declarations(Attributes)` **Mode and number of proofs:** `check_attribute_declarations(+list(pair))` - `one_or_error` **Exceptions:** An attribute is declared more than once or uses an invalid value domain: `domain_error(attribute_declarations,Attribute)` ------------------------------------------------------------------------ ###### `known_attribute_values/3` Collects the known numeric values for a continuous attribute from the training examples, skipping omitted and variable values. **Compilation flags:** `static` **Template:** `known_attribute_values(Examples,Attribute,Values)` **Mode and number of proofs:** `known_attribute_values(+list(compound),+atom,-list(number))` - `one` ------------------------------------------------------------------------ ###### `check_attribute_bindings/2` Checks that an attribute-value list contains only declared attributes and does not repeat any declared attribute; omitted declared attributes are allowed and treated as missing values. **Compilation flags:** `static` **Template:** `check_attribute_bindings(AttributeNames,AttributeValues)` **Mode and number of proofs:** `check_attribute_bindings(+list(atom),+list(pair))` - `one` ------------------------------------------------------------------------ ###### `check_declared_attribute_bindings/2` Checks that no declared attribute appears more than once in an attribute-value list. **Compilation flags:** `static` **Template:** `check_declared_attribute_bindings(AttributeNames,AttributeValues)` **Mode and number of proofs:** `check_declared_attribute_bindings(+list(atom),+list(pair))` - `one` ------------------------------------------------------------------------ ###### `check_undeclared_attribute_bindings/2` Checks that every attribute occurring in an attribute-value list is declared. **Compilation flags:** `static` **Template:** `check_undeclared_attribute_bindings(AttributeValues,AttributeNames)` **Mode and number of proofs:** `check_undeclared_attribute_bindings(+list(pair),+list(atom))` - `one` ------------------------------------------------------------------------ ###### `attribute_occurrences/4` Counts the number of times an attribute occurs in an attribute-value list. **Compilation flags:** `static` **Template:** `attribute_occurrences(AttributeValues,Attribute,Count0,Count)` **Mode and number of proofs:** `attribute_occurrences(+list(pair),+atom,+integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `declared_attribute_names/2` Collects the declared attribute names from dataset attribute declarations. **Compilation flags:** `static` **Template:** `declared_attribute_names(Attributes,AttributeNames)` **Mode and number of proofs:** `declared_attribute_names(+list(pair),-list(atom))` - `one` ------------------------------------------------------------------------ ###### `encoder_attribute_names/2` Collects the declared attribute names from a list of regression encoders. **Compilation flags:** `static` **Template:** `encoder_attribute_names(Encoders,AttributeNames)` **Mode and number of proofs:** `encoder_attribute_names(+list(compound),-list(atom))` - `one` ------------------------------------------------------------------------ ###### `encode_instance_checked/3` Encodes an already validated attribute-value list as a numeric feature vector using a list of continuous and categorical encoders. **Compilation flags:** `static` **Template:** `encode_instance_checked(Encoders,AttributeValues,Features)` **Mode and number of proofs:** `encode_instance_checked(+list(compound),+list(pair),-list(float))` - `one` ------------------------------------------------------------------------ ###### `valid_linear_model_convergence/1` True when a linear-model optimization stop reason is recognized. **Compilation flags:** `static` **Template:** `valid_linear_model_convergence(Convergence)` **Mode and number of proofs:** `valid_linear_model_convergence(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `normalize_continuous/4` Normalizes a continuous value using a stored mean and scale. **Compilation flags:** `static` **Template:** `normalize_continuous(Value,Mean,Scale,Feature)` **Mode and number of proofs:** `normalize_continuous(+number,+float,+positive_float,-float)` - `one` ------------------------------------------------------------------------ ###### `check_categorical_value/3` Validates that a categorical value is declared for an attribute. **Compilation flags:** `static` **Template:** `check_categorical_value(Attribute,Values,Value)` **Mode and number of proofs:** `check_categorical_value(+atom,+list,+nonvar)` - `one` ------------------------------------------------------------------------ ###### `one_hot_encode/4` Encodes a declared categorical value using reference-level dummy coding plus a trailing missing-value indicator feature set to zero. **Compilation flags:** `static` **Template:** `one_hot_encode(Values,Value,Encoded,Tail)` **Mode and number of proofs:** `one_hot_encode(+list,+nonvar,-list(float),+list(float))` - `one` ------------------------------------------------------------------------ ###### `missing_one_hot_encode/3` Encodes a missing categorical value as reference-level dummy zeroes plus a trailing missing-value indicator feature set to one. **Compilation flags:** `static` **Template:** `missing_one_hot_encode(Values,Encoded,Tail)` **Mode and number of proofs:** `missing_one_hot_encode(+list,-list(float),+list(float))` - `one` ------------------------------------------------------------------------ ###### `zero_vector_from_values/3` Creates a zero vector with one element per supplied categorical value slot. **Compilation flags:** `static` **Template:** `zero_vector_from_values(Values,Zeroes,Tail)` **Mode and number of proofs:** `zero_vector_from_values(+list,-list(float),+list(float))` - `one` ------------------------------------------------------------------------ ###### `build_linear_encoders/4` Builds the encoder list used by linear models from dataset attribute declarations, training examples, and the effective feature scaling option. **Compilation flags:** `static` **Template:** `build_linear_encoders(Attributes,Examples,Options,Encoders)` **Mode and number of proofs:** `build_linear_encoders(+list(pair),+list(compound),+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `train_linear_model/6` Fits an ordinary least-squares linear model bias and weight vector from encoded rows by delegating the solve and rank estimation to the linear_algebra library and returns solver diagnostics terms. **Compilation flags:** `static` **Template:** `train_linear_model(Rows,FeatureCount,Options,Bias,Weights,TrainingDiagnostics)` **Mode and number of proofs:** `train_linear_model(+list(pair),+integer,+list(compound),-float,-list(float),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `rows_to_design_matrix/3` Transforms encoded training rows into a row-oriented design matrix with a leading intercept column and a target vector. **Compilation flags:** `static` **Template:** `rows_to_design_matrix(Rows,DesignMatrix,Targets)` **Mode and number of proofs:** `rows_to_design_matrix(+list(pair),-list(list(float)),-list(float))` - `one` ------------------------------------------------------------------------ ###### `residual_sum_of_squares/4` Computes the residual sum of squares for encoded training rows and a learned intercept plus weight vector. **Compilation flags:** `static` **Template:** `residual_sum_of_squares(Rows,Bias,Weights,ResidualSumOfSquares)` **Mode and number of proofs:** `residual_sum_of_squares(+list(pair),+float,+list(float),-float)` - `one` ------------------------------------------------------------------------ ###### `train_ridge_model/6` Fits a ridge model bias and weight vector from encoded rows by solving a direct weighted linear system and returns diagnostics terms describing the solve. **Compilation flags:** `static` **Template:** `train_ridge_model(Rows,FeatureCount,Options,Bias,Weights,TrainingDiagnostics)` **Mode and number of proofs:** `train_ridge_model(+list(pair),+integer,+list(compound),-float,-list(float),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `ridge_feature_statistics/3` Computes per-feature ridge penalty weights and active-feature flags from encoded training rows, dropping zero-variance columns from the direct solve. **Compilation flags:** `static` **Template:** `ridge_feature_statistics(Rows,PenaltyWeights,ActiveFlags)` **Mode and number of proofs:** `ridge_feature_statistics(+list(pair),-list(float),-list(atom))` - `one` ------------------------------------------------------------------------ ###### `accumulate_feature_statistics/5` Accumulates per-feature sums and squared sums over encoded training rows. **Compilation flags:** `static` **Template:** `accumulate_feature_statistics(Rows,Sums0,SumSquares0,Sums,SumSquares)` **Mode and number of proofs:** `accumulate_feature_statistics(+list(pair),+list(float),+list(float),-list(float),-list(float))` - `one` ------------------------------------------------------------------------ ###### `add_squared_vector/3` Adds the element-wise squares of a feature vector to an accumulated vector. **Compilation flags:** `static` **Template:** `add_squared_vector(Features,AccumulatedSquares0,AccumulatedSquares)` **Mode and number of proofs:** `add_squared_vector(+list(float),+list(float),-list(float))` - `one` ------------------------------------------------------------------------ ###### `feature_penalty_profiles/5` Builds ridge penalty weights and active-feature flags from per-feature sums and squared sums. **Compilation flags:** `static` **Template:** `feature_penalty_profiles(Sums,SumSquares,Count,PenaltyWeights,ActiveFlags)` **Mode and number of proofs:** `feature_penalty_profiles(+list(float),+list(float),+integer,-list(float),-list(atom))` - `one` ------------------------------------------------------------------------ ###### `active_feature_count/2` Counts the number of active encoded features retained for the direct ridge solve. **Compilation flags:** `static` **Template:** `active_feature_count(ActiveFlags,Count)` **Mode and number of proofs:** `active_feature_count(+list(atom),-integer)` - `one` ------------------------------------------------------------------------ ###### `compress_rows/3` Filters encoded training rows down to the active feature subset selected for the direct ridge solve. **Compilation flags:** `static` **Template:** `compress_rows(Rows,ActiveFlags,CompressedRows)` **Mode and number of proofs:** `compress_rows(+list(pair),+list(atom),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `compress_features/3` Filters a feature vector down to the active feature subset selected for the direct ridge solve. **Compilation flags:** `static` **Template:** `compress_features(Features,ActiveFlags,CompressedFeatures)` **Mode and number of proofs:** `compress_features(+list(float),+list(atom),-list(float))` - `one` ------------------------------------------------------------------------ ###### `compress_vector/3` Filters a numeric vector down to the active positions selected for the direct ridge solve. **Compilation flags:** `static` **Template:** `compress_vector(Vector,ActiveFlags,CompressedVector)` **Mode and number of proofs:** `compress_vector(+list(float),+list(atom),-list(float))` - `one` ------------------------------------------------------------------------ ###### `build_ridge_system/5` Builds the regularized linear system for the intercept plus active ridge coefficients. **Compilation flags:** `static` **Template:** `build_ridge_system(Rows,PenaltyWeights,Regularization,Matrix,Vector)` **Mode and number of proofs:** `build_ridge_system(+list(pair),+list(float),+float,-list(list(float)),-list(float))` - `one` ------------------------------------------------------------------------ ###### `accumulate_ridge_system/5` Accumulates the unregularized normal-equation matrix and target vector for a set of active encoded rows. **Compilation flags:** `static` **Template:** `accumulate_ridge_system(Rows,Matrix0,Vector0,Matrix,Vector)` **Mode and number of proofs:** `accumulate_ridge_system(+list(pair),+list(list(float)),+list(float),-list(list(float)),-list(float))` - `one` ------------------------------------------------------------------------ ###### `add_outer_product/4` Adds the outer product of two vectors to an accumulated matrix. **Compilation flags:** `static` **Template:** `add_outer_product(Vector1,Vector2,Matrix0,Matrix)` **Mode and number of proofs:** `add_outer_product(+list(float),+list(float),+list(list(float)),-list(list(float)))` - `one` ------------------------------------------------------------------------ ###### `regularize_ridge_matrix/4` Adds the ridge penalty weights to the feature-feature diagonal block of a linear system matrix. **Compilation flags:** `static` **Template:** `regularize_ridge_matrix(Matrix0,PenaltyWeights,Regularization,Matrix)` **Mode and number of proofs:** `regularize_ridge_matrix(+list(list(float)),+list(float),+float,-list(list(float)))` - `one` ------------------------------------------------------------------------ ###### `solve_linear_system/4` Solves a square linear system using partial pivoting Gaussian elimination and returns the solver name. **Compilation flags:** `static` **Template:** `solve_linear_system(Matrix,Vector,Solution,Solver)` **Mode and number of proofs:** `solve_linear_system(+list(list(float)),+list(float),-list(float),-atom)` - `one_or_error` **Exceptions:** The linear system is singular because a pivot coefficient becomes numerically zero: `evaluation_error(zero_divisor)` ------------------------------------------------------------------------ ###### `augment_rows/3` Pairs each matrix row with its corresponding right-hand-side value for elimination. **Compilation flags:** `static` **Template:** `augment_rows(Matrix,Vector,Rows)` **Mode and number of proofs:** `augment_rows(+list(list(float)),+list(float),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `triangularize/2` Transforms an augmented matrix into upper-triangular form using partial pivoting. **Compilation flags:** `static` **Template:** `triangularize(Rows0,UpperRows)` **Mode and number of proofs:** `triangularize(+list(compound),-list(compound))` - `one_or_error` **Exceptions:** A pivot coefficient is numerically zero during elimination: `evaluation_error(zero_divisor)` ------------------------------------------------------------------------ ###### `select_pivot_row/3` Selects the pivot row with the largest leading magnitude and returns the remaining rows. **Compilation flags:** `static` **Template:** `select_pivot_row(Rows0,PivotRow,RemainingRows)` **Mode and number of proofs:** `select_pivot_row(+list(compound),-compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `leading_magnitude/2` Returns the absolute leading coefficient magnitude of an augmented row. **Compilation flags:** `static` **Template:** `leading_magnitude(Row,Magnitude)` **Mode and number of proofs:** `leading_magnitude(+compound,-float)` - `one` ------------------------------------------------------------------------ ###### `ensure_non_zero/1` Checks that a pivot coefficient is numerically non-zero. **Compilation flags:** `static` **Template:** `ensure_non_zero(Value)` **Mode and number of proofs:** `ensure_non_zero(+float)` - `one_or_error` **Exceptions:** A pivot coefficient is numerically zero: `evaluation_error(zero_divisor)` ------------------------------------------------------------------------ ###### `eliminate_rows/5` Eliminates the leading coefficient from remaining augmented rows using a pivot row. **Compilation flags:** `static` **Template:** `eliminate_rows(Pivot,PivotTail,PivotValue,Rows0,Rows)` **Mode and number of proofs:** `eliminate_rows(+float,+list(float),+float,+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `scaled_row_difference/4` Subtracts a scaled pivot tail from another row tail. **Compilation flags:** `static` **Template:** `scaled_row_difference(PivotTail,RowTail,Factor,Difference)` **Mode and number of proofs:** `scaled_row_difference(+list(float),+list(float),+float,-list(float))` - `one` ------------------------------------------------------------------------ ###### `back_substitution/2` Performs back-substitution on an upper-triangular augmented matrix. **Compilation flags:** `static` **Template:** `back_substitution(UpperRows,Solution)` **Mode and number of proofs:** `back_substitution(+list(compound),-list(float))` - `one_or_error` **Exceptions:** A diagonal coefficient is numerically zero during back-substitution: `evaluation_error(zero_divisor)` ------------------------------------------------------------------------ ###### `maximum_linear_system_residual/4` Computes the maximum absolute residual of a solved linear system. **Compilation flags:** `static` **Template:** `maximum_linear_system_residual(Matrix,Vector,Solution,MaximumResidual)` **Mode and number of proofs:** `maximum_linear_system_residual(+list(list(float)),+list(float),+list(float),-float)` - `one` ------------------------------------------------------------------------ ###### `expand_weights/3` Expands active ridge coefficients back to the full encoded feature vector, inserting zeroes for dropped zero-variance features. **Compilation flags:** `static` **Template:** `expand_weights(ActiveFlags,ActiveWeights,Weights)` **Mode and number of proofs:** `expand_weights(+list(atom),+list(float),-list(float))` - `one` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `regressor_protocol` Protocol for machine learning regressors. **Availability:** `logtalk_load(regression_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-01 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `learn/3` - `learn/2` - `predict/3` - `check_regressor/1` - `valid_regressor/1` - `diagnostics/2` - `diagnostic/2` - `regressor_options/2` - `export_to_clauses/4` - `export_to_file/4` - `print_regressor/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `learn/3` Learns a regressor from the given dataset object using the specified options. **Compilation flags:** `static` **Template:** `learn(Dataset,Regressor,Options)` **Mode and number of proofs:** `learn(+object_identifier,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `learn/2` Learns a regressor from the given dataset object using default options. **Compilation flags:** `static` **Template:** `learn(Dataset,Regressor)` **Mode and number of proofs:** `learn(+object_identifier,-compound)` - `one` ------------------------------------------------------------------------ ###### `predict/3` Predicts the numeric target value for a new instance using the learned regressor. The instance is a list of `Attribute-Value` pairs. **Compilation flags:** `static` **Template:** `predict(Regressor,Instance,Target)` **Mode and number of proofs:** `predict(+compound,+list,-number)` - `one` ------------------------------------------------------------------------ ###### `check_regressor/1` Checks that a learned regressor term is structurally valid for the receiving implementation. Throws an exception when the term is not a valid regressor representation. **Compilation flags:** `static` **Template:** `check_regressor(Regressor)` **Mode and number of proofs:** `check_regressor(@compound)` - `one_or_error` **Exceptions:** `Regressor` is a variable: `instantiation_error` `Regressor` is neither a variable nor a valid regressor: `domain_error(regressor,Regressor)` ------------------------------------------------------------------------ ###### `valid_regressor/1` True when a learned regressor term is structurally valid for the receiving implementation. Succeeds iff `check_regressor/1` succeeds without throwing an exception. **Compilation flags:** `static` **Template:** `valid_regressor(Regressor)` **Mode and number of proofs:** `valid_regressor(@compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `diagnostics/2` Returns diagnostics metadata for a learned regressor. **Compilation flags:** `static` **Template:** `diagnostics(Regressor,Diagnostics)` **Mode and number of proofs:** `diagnostics(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostic/2` Enumerates individual diagnostics metadata terms for a learned regressor. **Compilation flags:** `static` **Template:** `diagnostic(Regressor,Diagnostic)` **Mode and number of proofs:** `diagnostic(+compound,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `regressor_options/2` Returns the effective options stored in a learned regressor diagnostics metadata. **Compilation flags:** `static` **Template:** `regressor_options(Regressor,Options)` **Mode and number of proofs:** `regressor_options(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `export_to_clauses/4` Converts a regressor into a list of predicate clauses. `Functor` is the functor for the generated predicate clauses. When exporting a serialized regressor term, a noun such as `regressor` or `model` is usually clearer than a verb such as `predict`. **Compilation flags:** `static` **Template:** `export_to_clauses(Dataset,Regressor,Functor,Clauses)` **Mode and number of proofs:** `export_to_clauses(+object_identifier,+compound,+callable,-list(clause))` - `one` ------------------------------------------------------------------------ ###### `export_to_file/4` Exports a regressor to a file. `Functor` is the functor for the generated predicate clauses. When exporting a serialized regressor term, a noun such as `regressor` or `model` is usually clearer than a verb such as `predict`. **Compilation flags:** `static` **Template:** `export_to_file(Dataset,Regressor,Functor,File)` **Mode and number of proofs:** `export_to_file(+object_identifier,+compound,+callable,+atom)` - `one` ------------------------------------------------------------------------ ###### `print_regressor/1` Prints a regressor to the current output stream in a human-readable format. **Compilation flags:** `static` **Template:** `print_regressor(Regressor)` **Mode and number of proofs:** `print_regressor(+compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also linear_regression, regression_dataset_protocol ### regression_tree") **object** #### `regression_tree` Regression tree regressor supporting continuous and mixed-feature datasets using recursive variance-reduction splits. **Availability:** `logtalk_load(regression_tree(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** fast_random(Algorithm) format list population type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, knn_regression, random_forest_regression, gradient_boosting_regression ### regularized_bradley_terry_ranker") **object** #### `regularized_bradley_terry_ranker` Regularized Bradley-Terry MAP ranker. Learns one positive strength parameter per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol using a Bradley-Terry likelihood with an explicit independent Gamma prior, and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(regularized_bradley_terry_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` pairwise_strength_ranker_common `public` score_ranker_common **Uses:** avltree format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, bradley_terry_ranker ### rest") **category** #### `rest` REST authoring layer built on top of the HTTP router category. **Availability:** `logtalk_load(rest(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-06-26 **Compilation flags:** `static` **Extends:** `public` http_router **Uses:** http_core list open_api **Remarks:** (none) **Inherited public predicates:**  api_info/1  handle/2  operations/1  schema/2  security/1  security_scheme/2  servers/1 - Public predicates - `path_parameter/3` - `query_parameter/3` - `request_header/3` - `request_body/2` - `json_body/2` - `json_object_body/2` - `json_array_body/2` - `form_body/2` - `text_body/2` - `binary_body/2` - `json_response/4` - `json_response/5` - `created_response/4` - `no_content_response/2` - `problem_response/6` - Protected predicates - `endpoint/5` - `open_api_validate_request/1` - `open_api_request_validation_error_response/4` - `open_api_validate_response/1` - `open_api_response_validation_error_response/5` - `rest_action_failure_response/3` - `rest_action_error_response/4` - `dispatch_rest_endpoint/2` - Private predicates - Operators ##### Public predicates ###### `path_parameter/3` Returns a named path parameter extracted by the router from the current request using deterministic lookup. **Compilation flags:** `static` **Template:** `path_parameter(Request,Name,Value)` **Mode and number of proofs:** `path_parameter(+compound,?atom,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `query_parameter/3` Returns the first named query parameter from the current request when query pairs are available. **Compilation flags:** `static` **Template:** `query_parameter(Request,Name,Value)` **Mode and number of proofs:** `query_parameter(+compound,?atom,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `request_header/3` Returns a normalized request header value. **Compilation flags:** `static` **Template:** `request_header(Request,Name,Value)` **Mode and number of proofs:** `request_header(+compound,?atom,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `request_body/2` Returns the normalized request body term. **Compilation flags:** `static` **Template:** `request_body(Request,Body)` **Mode and number of proofs:** `request_body(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `json_body/2` Returns the decoded JSON payload from a normalized request body and reports a client error when the request body is missing or not decoded as JSON. **Compilation flags:** `static` **Template:** `json_body(Request,JSON)` **Mode and number of proofs:** `json_body(+compound,-term)` - `one_or_error` **Exceptions:** The normalized request body is missing or is not decoded as JSON: `problem(400,urn:logtalk:invalid-request-body,Bad`` ``Request,Expected`` ``JSON`` ``request`` ``body.)` ------------------------------------------------------------------------ ###### `json_object_body/2` Returns the decoded JSON payload when it is a JSON object term and reports a client error when the request body is missing, not decoded as JSON, or not an object. **Compilation flags:** `static` **Template:** `json_object_body(Request,JSONObject)` **Mode and number of proofs:** `json_object_body(+compound,-term)` - `one_or_error` **Exceptions:** The normalized request body is missing or is not decoded as JSON: `problem(400,urn:logtalk:invalid-request-body,Bad`` ``Request,Expected`` ``JSON`` ``request`` ``body.)` The decoded JSON payload is not a JSON object term: `problem(400,urn:logtalk:invalid-request-body,Bad`` ``Request,Expected`` ``JSON`` ``object`` ``request`` ``body.)` ------------------------------------------------------------------------ ###### `json_array_body/2` Returns the decoded JSON payload when it is a JSON array term and reports a client error when the request body is missing, not decoded as JSON, or not an array. **Compilation flags:** `static` **Template:** `json_array_body(Request,JSONArray)` **Mode and number of proofs:** `json_array_body(+compound,-list)` - `one_or_error` **Exceptions:** The normalized request body is missing or is not decoded as JSON: `problem(400,urn:logtalk:invalid-request-body,Bad`` ``Request,Expected`` ``JSON`` ``request`` ``body.)` The decoded JSON payload is not a JSON array term: `problem(400,urn:logtalk:invalid-request-body,Bad`` ``Request,Expected`` ``JSON`` ``array`` ``request`` ``body.)` ------------------------------------------------------------------------ ###### `form_body/2` Returns the decoded form payload from a normalized request body and reports a client error when the request body is missing or not decoded as form data. **Compilation flags:** `static` **Template:** `form_body(Request,Pairs)` **Mode and number of proofs:** `form_body(+compound,-list(compound))` - `one_or_error` **Exceptions:** The normalized request body is missing or is not decoded as form data: `problem(400,urn:logtalk:invalid-request-body,Bad`` ``Request,Expected`` ``form`` ``request`` ``body.)` ------------------------------------------------------------------------ ###### `text_body/2` Returns the decoded text payload from a normalized request body and reports a client error when the request body is missing or not decoded as text. **Compilation flags:** `static` **Template:** `text_body(Request,Text)` **Mode and number of proofs:** `text_body(+compound,-atom)` - `one_or_error` **Exceptions:** The normalized request body is missing or is not decoded as text: `problem(400,urn:logtalk:invalid-request-body,Bad`` ``Request,Expected`` ``text`` ``request`` ``body.)` ------------------------------------------------------------------------ ###### `binary_body/2` Returns the decoded binary payload from a normalized request body and reports a client error when the request body is missing or not decoded as binary. **Compilation flags:** `static` **Template:** `binary_body(Request,Bytes)` **Mode and number of proofs:** `binary_body(+compound,-list(integer))` - `one_or_error` **Exceptions:** The normalized request body is missing or is not decoded as binary: `problem(400,urn:logtalk:invalid-request-body,Bad`` ``Request,Expected`` ``binary`` ``request`` ``body.)` ------------------------------------------------------------------------ ###### `json_response/4` Builds a JSON response for the given request and status descriptor, honoring any negotiated response media type annotation. **Compilation flags:** `static` **Template:** `json_response(Request,Status,JSON,Response)` **Mode and number of proofs:** `json_response(+compound,++term,++term,-compound)` - `one_or_error` **Exceptions:** `Status` is a variable or a `status(Code,`` ``Reason)` term with a variable argument: `instantiation_error` `Status` is an integer without a built-in reason phrase supported by the rest library: `domain_error(http_status_code,Status)` `Status` is neither an integer nor a valid normalized HTTP status term: `domain_error(http_status,Status)` ------------------------------------------------------------------------ ###### `json_response/5` Builds a JSON response for the given request and status descriptor, honoring any negotiated response media type annotation and adding the provided normalized headers. **Compilation flags:** `static` **Template:** `json_response(Request,Status,Headers,JSON,Response)` **Mode and number of proofs:** `json_response(+compound,++term,+list(compound),++term,-compound)` - `one_or_error` **Exceptions:** `Status` is a variable or a `status(Code,`` ``Reason)` term with a variable argument: `instantiation_error` `Status` is an integer without a built-in reason phrase supported by the rest library: `domain_error(http_status_code,Status)` `Status` is neither an integer nor a valid normalized HTTP status term: `domain_error(http_status,Status)` `Headers` is not a valid normalized header list: `domain_error(http_headers,Headers)` ------------------------------------------------------------------------ ###### `created_response/4` Builds a `201`` ``Created` JSON response with a `Location` header, honoring any negotiated response media type annotation. **Compilation flags:** `static` **Template:** `created_response(Request,Location,JSON,Response)` **Mode and number of proofs:** `created_response(+compound,++term,++term,-compound)` - `one_or_error` **Exceptions:** `Location` is not a valid normalized header value: `domain_error(http_header_value,Location)` ------------------------------------------------------------------------ ###### `no_content_response/2` Builds a `204`` ``No`` ``Content` response. **Compilation flags:** `static` **Template:** `no_content_response(Request,Response)` **Mode and number of proofs:** `no_content_response(+compound,-compound)` - `one_or_error` **Exceptions:** `Request` is not a valid normalized HTTP request term: `domain_error(http_request,Request)` ------------------------------------------------------------------------ ###### `problem_response/6` Builds an `application/problem+json` response with the standard `type`, `title`, `detail`, and numeric `status` fields. **Compilation flags:** `static` **Template:** `problem_response(Request,Status,Type,Title,Detail,Response)` **Mode and number of proofs:** `problem_response(+compound,++term,++atom,++atom,++atom,-compound)` - `one_or_error` **Exceptions:** `Status` is a variable or a `status(Code,`` ``Reason)` term with a variable argument: `instantiation_error` `Status` is an integer without a built-in reason phrase supported by the rest library: `domain_error(http_status_code,Status)` `Status` is neither an integer nor a valid normalized HTTP status term: `domain_error(http_status,Status)` ------------------------------------------------------------------------ ##### Protected predicates ###### `endpoint/5` Hook predicate that enumerates REST endpoint descriptors. `Id` is the endpoint identifier and must be unique within the importing object; when OpenAPI derivation is used it also becomes the operation identifier. `Method` is the lowercase HTTP method, `Path` the path template, `Action` the name of a declared local predicate with arity 2, and `Options` a list of route metadata terms plus the optional `produces(MediaTypes)` descriptor. **Compilation flags:** `static` **Template:** `endpoint(Id,Method,Path,Action,Options)` **Mode and number of proofs:** `endpoint(?atom,?atom,?atom,?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `open_api_validate_request/1` Optional hook predicate that enables automatic OpenAPI request contract validation for the given endpoint identifier before its action predicate is called. **Compilation flags:** `static` **Template:** `open_api_validate_request(Id)` **Mode and number of proofs:** `open_api_validate_request(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `open_api_request_validation_error_response/4` Optional hook predicate that customizes the response returned when OpenAPI request contract validation fails. The default implementation preserves the distinction between generic `400` request failures, `415`` ``Unsupported`` ``Media`` ``Type`, and `422`` ``Unprocessable`` ``Content` for invalid request bodies. The arguments are the current request, the endpoint identifier, the validation errors, and the response to send. **Compilation flags:** `static` **Template:** `open_api_request_validation_error_response(Request,Id,Errors,Response)` **Mode and number of proofs:** `open_api_request_validation_error_response(+compound,+atom,+list,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `open_api_validate_response/1` Optional hook predicate that enables automatic OpenAPI response contract validation for the given endpoint identifier after its action result is normalized into an HTTP response. **Compilation flags:** `static` **Template:** `open_api_validate_response(Id)` **Mode and number of proofs:** `open_api_validate_response(?atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `open_api_response_validation_error_response/5` Optional hook predicate that customizes the response returned when OpenAPI response contract validation fails. The arguments are the current request, the endpoint identifier, the candidate response, the validation errors, and the response to send. **Compilation flags:** `static` **Template:** `open_api_response_validation_error_response(Request,Id,Response0,Errors,Response)` **Mode and number of proofs:** `open_api_response_validation_error_response(+compound,+atom,+compound,+list,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rest_action_failure_response/3` Optional hook predicate that customizes the response returned when the matched endpoint action fails without throwing an exception. The arguments are the current request, the endpoint identifier, and the response to send. **Compilation flags:** `static` **Template:** `rest_action_failure_response(Request,Id,Response)` **Mode and number of proofs:** `rest_action_failure_response(+compound,+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rest_action_error_response/4` Optional hook predicate that customizes the response returned when the matched endpoint action throws an unsupported exception. The arguments are the current request, the endpoint identifier, the thrown term, and the response to send. **Compilation flags:** `static` **Template:** `rest_action_error_response(Request,Id,Error,Response)` **Mode and number of proofs:** `rest_action_error_response(+compound,+atom,+term,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `dispatch_rest_endpoint/2` Runs the action associated with the matched endpoint and normalizes any supported returned or thrown result term into an HTTP response. **Compilation flags:** `static` **Template:** `dispatch_rest_endpoint(Request,Response)` **Mode and number of proofs:** `dispatch_rest_endpoint(+compound,-compound)` - `one_or_error` **Exceptions:** The routed endpoint identifier is missing or unknown: `existence_error(rest_endpoint_id,Id)` The routed endpoint identifier is duplicated: `domain_error(rest_endpoint_id,duplicate(Id))` The endpoint action produces an invalid REST result term: `domain_error(rest_result,Result)` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### ridge_regression") **object** #### `ridge_regression` Ridge regression regressor supporting continuous and mixed-feature datasets using a direct weighted linear-system solve with L2 regularization. Learns from a dataset object implementing the `regression_dataset_protocol` protocol and returns a regressor term that can be used for prediction and exported as predicate clauses. **Availability:** `logtalk_load(ridge_regression(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-05 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` regressor_common **Uses:** format list numberlist type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_regressor/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  print_regressor/1  regressor_options/2  valid_option/1  valid_options/1  valid_regressor/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also linear_regression, knn_regression, regression_tree, random_forest_regression, gradient_boosting_regression ### s3") **object** #### `s3_client` Stateless S3-compatible client facade over the normalized HTTP client using by default the `http_process_transport` library. **Availability:** `logtalk_load(s3(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` s3_client(http_process_transport) **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  copy_object/5  default_option/1  default_options/1  delete_object/4  get_object/5  head_bucket/3  head_object/4  list_buckets/2  list_objects_v2/4  option/2  option/3  presigned_get_object/4  presigned_post_object/4  presigned_put_object/4  put_object/6  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `s3_client(HTTPTransport)` Stateless S3-compatible client facade over the normalized HTTP client. **Availability:** `logtalk_load(s3(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` s3_protocol **Imports:** `public` options **Uses:** http_client http_core list mime_types os s3_endpoints s3_headers s3_signing s3_xml type url(Representation) user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  copy_object/5  default_option/1  default_options/1  delete_object/4  get_object/5  head_bucket/3  head_object/4  list_buckets/2  list_objects_v2/4  option/2  option/3  presigned_get_object/4  presigned_post_object/4  presigned_put_object/4  put_object/6  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `s3_endpoints` Endpoint and canonical-URI helpers for S3-compatible services. **Availability:** `logtalk_load(s3(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** list url(Representation) user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `request/6` - `canonical_uri/4` - `canonical_uri/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `request/6` Builds the request base URL plus signing endpoint context for an S3 operation. **Compilation flags:** `static` **Template:** `request(Operation,Bucket,Key,URL,Endpoint,Options)` **Mode and number of proofs:** `request(+atom,@atom,@atom,-atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Operation` is not a supported S3 operation: `domain_error(s3_operation,Operation)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable not a valid bucket: `domain_error(s3_request,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable not a valid key: `domain_error(s3_request,Key)` `Options` contains an invalid endpoint or addressing style: `domain_error(s3_endpoint,Endpoint)` **Remarks:** > - Option `region/1`: AWS region to use when `endpoint/1` is absent. Defaults to `us-east-1`. > > - Option `endpoint/1`: Optional custom S3-compatible base endpoint URL, which may include a path prefix. > > - Option `addressing_style/1`: Endpoint addressing style, either `virtual_hosted` or `path`. Defaults to `virtual_hosted`. ------------------------------------------------------------------------ ###### `canonical_uri/4` Returns the canonical request URI for an S3 operation using the selected endpoint style. **Compilation flags:** `static` **Template:** `canonical_uri(Operation,Bucket,Key,CanonicalURI)` **Mode and number of proofs:** `canonical_uri(+atom,@atom,@atom,-atom)` - `one_or_error` **Exceptions:** `Operation` is not a supported S3 operation: `domain_error(s3_operation,Operation)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable not a valid bucket: `domain_error(s3_request,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable not a valid key: `domain_error(s3_request,Key)` ------------------------------------------------------------------------ ###### `canonical_uri/5` Returns the canonical request URI for an S3 operation using an explicit endpoint context. **Compilation flags:** `static` **Template:** `canonical_uri(Operation,Context,Bucket,Key,CanonicalURI)` **Mode and number of proofs:** `canonical_uri(+atom,+compound,@atom,@atom,-atom)` - `one_or_error` **Exceptions:** `Operation` is not a supported S3 operation: `domain_error(s3_operation,Operation)` `Context` is not a valid endpoint context: `domain_error(s3_endpoint,Context)` `Bucket` is a variable: `instantiation_error` `Bucket` or `Key` is invalid for the operation: `domain_error(s3_request,Argument)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `s3_headers` Helpers for extracting S3 response metadata from normalized HTTP responses. **Availability:** `logtalk_load(s3(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** http_core **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `response_properties/2` - `header_value/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `response_properties/2` Collects status and response headers into a stable property list. **Compilation flags:** `static` **Template:** `response_properties(Response,Properties)` **Mode and number of proofs:** `response_properties(+compound,-list(compound))` - `one_or_error` **Exceptions:** `Response` is not a normalized HTTP response term: `domain_error(http_response,Response)` ------------------------------------------------------------------------ ###### `header_value/3` Enumerates response header values by normalized header name. **Compilation flags:** `static` **Template:** `header_value(Response,Name,Value)` **Mode and number of proofs:** `header_value(+compound,+atom,-term)` - `zero_or_more` **Exceptions:** `Response` is not a normalized HTTP response term: `domain_error(http_response,Response)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `s3_protocol` S3-compatible client facade predicates. **Availability:** `logtalk_load(s3(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `list_buckets/2` - `head_bucket/3` - `list_objects_v2/4` - `head_object/4` - `get_object/5` - `put_object/6` - `delete_object/4` - `copy_object/5` - `presigned_get_object/4` - `presigned_put_object/4` - `presigned_post_object/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `list_buckets/2` Lists accessible buckets. **Compilation flags:** `static` **Template:** `list_buckets(Buckets,Options)` **Mode and number of proofs:** `list_buckets(-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` Credentials are missing or invalid: `domain_error(s3_credentials,missing)` The S3 service returned a non-success status or malformed XML body: `domain_error(s3_http_status,Status)` **Remarks:** > - Option `credentials/1`: Required access credentials as `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`. > > - Option `session_token/1`: Optional session token for temporary credentials. > > - Option `region/1`: AWS region to use when `endpoint/1` is absent. Defaults to `us-east-1`. > > - Option `endpoint/1`: Optional custom S3-compatible endpoint URL. > > - Option `addressing_style/1`: Endpoint addressing style, either `virtual_hosted` or `path`. Defaults to `virtual_hosted`. > > - Option `headers/1`: Optional extra normalized HTTP request headers. > > - Option `version/1`: HTTP protocol version as `http(Major,`` ``Minor)`. Defaults to `http(1,1)`. > > - Option `properties/1`: Optional extra normalized HTTP request properties. > > - Option `connection_options/1`: Optional transport-specific HTTP client options. > > - Option `payload_hash_mode/1`: Payload signing mode, either `signed` or `unsigned`. Defaults to `signed`. > > - Option `request_time/1`: Optional explicit local request time as `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`. > > - Option `utc_offset_seconds/1`: UTC offset used to derive the signing time from the local clock. Defaults to `0`. > > - Option `amz_date/1`: Optional explicit AWS SigV4 timestamp overriding any derived request time. ------------------------------------------------------------------------ ###### `head_bucket/3` Returns response metadata for a bucket. **Compilation flags:** `static` **Template:** `head_bucket(Bucket,Metadata,Options)` **Mode and number of proofs:** `head_bucket(+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` The S3 service returned a non-success status: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Supported options are the standard S3 request options: `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`, optional `session_token(Token)`, `region(Region)`, optional custom `endpoint(URL)`, `addressing_style(virtual_hosted|path)`, optional `headers(Headers)`, `version(http(Major,`` ``Minor))`, optional `properties(Properties)`, optional `connection_options(ConnectionOptions)`, `payload_hash_mode(signed|unsigned)`, optional `request_time(date_time(...))`, `utc_offset_seconds(OffsetSeconds)`, and optional explicit `amz_date(AmzDate)`. ------------------------------------------------------------------------ ###### `list_objects_v2/4` Lists bucket objects using the ListObjectsV2 API. **Compilation flags:** `static` **Template:** `list_objects_v2(Bucket,Request,Listing,Options)` **Mode and number of proofs:** `list_objects_v2(+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Request` is a variable: `instantiation_error` An element `Option` of the request option list is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` An element `Option` of the request option list is neither a variable nor a compound term: `type_error(compound,Option)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Request` is not a valid ListObjectsV2 request term or option list: `domain_error(s3_list_objects_request,Request)` An element `Option` of the request option list is a compound term but not a valid ListObjectsV2 request option: `domain_error(s3_list_objects_request_option,Option)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` The S3 service returned a non-success status or malformed XML body: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: `Options` accepts the standard S3 request options: `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`, optional `session_token(Token)`, `region(Region)`, optional custom `endpoint(URL)`, `addressing_style(virtual_hosted|path)`, optional `headers(Headers)`, `version(http(Major,`` ``Minor))`, optional `properties(Properties)`, optional `connection_options(ConnectionOptions)`, `payload_hash_mode(signed|unsigned)`, optional `request_time(date_time(...))`, `utc_offset_seconds(OffsetSeconds)`, and optional explicit `amz_date(AmzDate)`. The `Request` argument carries the ListObjectsV2-specific request options. ------------------------------------------------------------------------ ###### `head_object/4` Returns response metadata for an object. **Compilation flags:** `static` **Template:** `head_object(Bucket,Key,Metadata,Options)` **Mode and number of proofs:** `head_object(+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Key` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` The S3 service returned a non-success status: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Supported options are the standard S3 request options: `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`, optional `session_token(Token)`, `region(Region)`, optional custom `endpoint(URL)`, `addressing_style(virtual_hosted|path)`, optional `headers(Headers)`, `version(http(Major,`` ``Minor))`, optional `properties(Properties)`, optional `connection_options(ConnectionOptions)`, `payload_hash_mode(signed|unsigned)`, optional `request_time(date_time(...))`, `utc_offset_seconds(OffsetSeconds)`, and optional explicit `amz_date(AmzDate)`. ------------------------------------------------------------------------ ###### `get_object/5` Fetches an object into a local file path and returns its response metadata as a separate argument. **Compilation flags:** `static` **Template:** `get_object(Bucket,Key,File,Properties,Options)` **Mode and number of proofs:** `get_object(+atom,+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Key` is a variable: `instantiation_error` `File` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `File` is neither a variable nor an atom: `type_error(atom,File)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `File` exists but is not a writable file: `domain_error(file([],[write]),File)` The directory `Directory` exists but is not writable: `domain_error(directory([write]),Directory)` The directory `Directory` does not exist: `existence_error(directory,Directory)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` The S3 service returned a non-success status: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Supported options are: `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))` for access credentials; `session_token(Token)` for temporary credentials; `region(Region)` for the AWS region, defaulting to `us-east-1` when `endpoint/1` is absent; `endpoint(URL)` for a custom S3-compatible endpoint; `addressing_style(virtual_hosted|path)` for endpoint addressing, defaulting to `virtual_hosted`; `headers(Headers)` for extra normalized request headers; `version(http(Major,`` ``Minor))` for the HTTP protocol version, defaulting to `http(1,1)`; `properties(Properties)` for extra normalized HTTP request properties; `connection_options(ConnectionOptions)` for transport-specific HTTP client options; `payload_hash_mode(signed|unsigned)` for payload signing, defaulting to `signed`; `request_time(date_time(...))` for an explicit local request time; `utc_offset_seconds(OffsetSeconds)` for deriving UTC from the local clock, defaulting to `0`; and `amz_date(AmzDate)` for an explicit AWS SigV4 timestamp overriding time derivation. ------------------------------------------------------------------------ ###### `put_object/6` Uploads a local file path and returns the object ETag and response metadata as separate arguments. **Compilation flags:** `static` **Template:** `put_object(Bucket,Key,File,ETag,Properties,Options)` **Mode and number of proofs:** `put_object(+atom,+atom,+atom,-atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Key` is a variable: `instantiation_error` `File` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `File` is neither a variable nor an atom: `type_error(atom,File)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `File` exists but is not a readable file: `domain_error(file([],[read]),File)` The file `File` does not exist: `existence_error(file,File)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` The S3 service returned a non-success status: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Supported options are the standard S3 request options: `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`, optional `session_token(Token)`, `region(Region)`, optional custom `endpoint(URL)`, `addressing_style(virtual_hosted|path)`, optional `headers(Headers)`, `version(http(Major,`` ``Minor))`, optional `properties(Properties)`, optional `connection_options(ConnectionOptions)`, `payload_hash_mode(signed|unsigned)`, optional `request_time(date_time(...))`, `utc_offset_seconds(OffsetSeconds)`, and optional explicit `amz_date(AmzDate)`. ------------------------------------------------------------------------ ###### `delete_object/4` Deletes an object, returning `delete_result(Properties)`. **Compilation flags:** `static` **Template:** `delete_object(Bucket,Key,Result,Options)` **Mode and number of proofs:** `delete_object(+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Key` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` The S3 service returned a non-success status: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Supported options are the standard S3 request options: `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`, optional `session_token(Token)`, `region(Region)`, optional custom `endpoint(URL)`, `addressing_style(virtual_hosted|path)`, optional `headers(Headers)`, `version(http(Major,`` ``Minor))`, optional `properties(Properties)`, optional `connection_options(ConnectionOptions)`, `payload_hash_mode(signed|unsigned)`, optional `request_time(date_time(...))`, `utc_offset_seconds(OffsetSeconds)`, and optional explicit `amz_date(AmzDate)`. ------------------------------------------------------------------------ ###### `copy_object/5` Copies an object from a source bucket/key into the destination bucket/key, returning `copy_result(ETag,`` ``Properties)`. **Compilation flags:** `static` **Template:** `copy_object(Source,Bucket,Key,Result,Options)` **Mode and number of proofs:** `copy_object(+compound,+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Bucket` is a variable: `instantiation_error` `Key` is a variable: `instantiation_error` The version identifier in `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a compound term: `type_error(compound,Source)` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Key` is neither a variable nor an atom: `type_error(atom,Key)` The version identifier in `Source` is neither a variable nor an atom: `type_error(atom,VersionId)` `Source` is a compound term but not a valid copy source term: `domain_error(s3_copy_source,Source)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` The version identifier in `Source` is an atom but not a valid version identifier: `domain_error(s3_version_id,VersionId)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` The S3 service returned a non-success status or malformed XML body: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Supported options are the standard S3 request options: `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`, optional `session_token(Token)`, `region(Region)`, optional custom `endpoint(URL)`, `addressing_style(virtual_hosted|path)`, optional `headers(Headers)`, `version(http(Major,`` ``Minor))`, optional `properties(Properties)`, optional `connection_options(ConnectionOptions)`, `payload_hash_mode(signed|unsigned)`, optional `request_time(date_time(...))`, `utc_offset_seconds(OffsetSeconds)`, and optional explicit `amz_date(AmzDate)`. ------------------------------------------------------------------------ ###### `presigned_get_object/4` Generates a presigned URL for downloading an object with an external HTTP client. **Compilation flags:** `static` **Template:** `presigned_get_object(Bucket,Key,URL,Options)` **Mode and number of proofs:** `presigned_get_object(+atom,+atom,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Key` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` Credentials are missing or invalid: `domain_error(s3_credentials,missing)` The expiration is invalid or outside the AWS SigV4 range: `domain_error(s3_presign_expires,Expires)` The payload hash is missing, invalid, or incompatible with unsigned mode: `domain_error(s3_presign_payload_hash,Hash)` **Remarks:** > - Option `credentials/1`: Required access credentials as `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`. > > - Option `session_token/1`: Optional session token for temporary credentials. > > - Option `region/1`: AWS region to use when `endpoint/1` is absent. Defaults to `us-east-1`. > > - Option `endpoint/1`: Optional custom S3-compatible endpoint URL. > > - Option `addressing_style/1`: Endpoint addressing style, either `virtual_hosted` or `path`. Defaults to `virtual_hosted`. > > - Option `headers/1`: Optional extra normalized request headers. When present they are signed into the URL and must be reproduced by the eventual caller. > > - Option `payload_hash_mode/1`: Presigned URLs default to `payload_hash_mode(unsigned)`. Use `signed` together with `payload_hash/1` to sign a precomputed payload hash. > > - Option `payload_hash/1`: Precomputed hexadecimal SHA-256 payload hash required when `payload_hash_mode(signed)` is selected. > > - Option `request_time/1`: Optional explicit local request time as `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`. > > - Option `utc_offset_seconds/1`: UTC offset used to derive the signing time from the local clock. Defaults to `0`. > > - Option `amz_date/1`: Optional explicit AWS SigV4 timestamp overriding any derived request time. > > - Option `expires/1`: Presigned URL lifetime in seconds. Defaults to `900` and must not exceed `604800`. ------------------------------------------------------------------------ ###### `presigned_put_object/4` Generates a presigned URL for uploading an object with an external HTTP client. **Compilation flags:** `static` **Template:** `presigned_put_object(Bucket,Key,URL,Options)` **Mode and number of proofs:** `presigned_put_object(+atom,+atom,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Key` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` Credentials are missing or invalid: `domain_error(s3_credentials,missing)` The expiration is invalid or outside the AWS SigV4 range: `domain_error(s3_presign_expires,Expires)` The payload hash is missing, invalid, or incompatible with unsigned mode: `domain_error(s3_presign_payload_hash,Hash)` **Remarks:** > - Option `credentials/1`: Required access credentials as `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`. > > - Option `session_token/1`: Optional session token for temporary credentials. > > - Option `region/1`: AWS region to use when `endpoint/1` is absent. Defaults to `us-east-1`. > > - Option `endpoint/1`: Optional custom S3-compatible endpoint URL. > > - Option `addressing_style/1`: Endpoint addressing style, either `virtual_hosted` or `path`. Defaults to `virtual_hosted`. > > - Option `headers/1`: Optional extra normalized request headers. When present they are signed into the URL and must be reproduced by the eventual caller. > > - Option `payload_hash_mode/1`: Presigned URLs default to `payload_hash_mode(unsigned)`. Use `signed` together with `payload_hash/1` to sign a precomputed payload hash. > > - Option `payload_hash/1`: Precomputed hexadecimal SHA-256 payload hash required when `payload_hash_mode(signed)` is selected. > > - Option `request_time/1`: Optional explicit local request time as `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`. > > - Option `utc_offset_seconds/1`: UTC offset used to derive the signing time from the local clock. Defaults to `0`. > > - Option `amz_date/1`: Optional explicit AWS SigV4 timestamp overriding any derived request time. > > - Option `expires/1`: Presigned URL lifetime in seconds. Defaults to `900` and must not exceed `604800`. ------------------------------------------------------------------------ ###### `presigned_post_object/4` Generates a presigned URL for a POST request to an object with an external HTTP client. **Compilation flags:** `static` **Template:** `presigned_post_object(Bucket,Key,URL,Options)` **Mode and number of proofs:** `presigned_post_object(+atom,+atom,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Bucket` is a variable: `instantiation_error` `Key` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(option,Option)` `Options` contains an invalid S3 client option: `domain_error(s3_client_option,Option)` Credentials are missing or invalid: `domain_error(s3_credentials,missing)` The expiration is invalid or outside the AWS SigV4 range: `domain_error(s3_presign_expires,Expires)` The payload hash is missing, invalid, or incompatible with unsigned mode: `domain_error(s3_presign_payload_hash,Hash)` **Remarks:** > - Option `credentials/1`: Required access credentials as `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`. > > - Option `session_token/1`: Optional session token for temporary credentials. > > - Option `region/1`: AWS region to use when `endpoint/1` is absent. Defaults to `us-east-1`. > > - Option `endpoint/1`: Optional custom S3-compatible endpoint URL. > > - Option `addressing_style/1`: Endpoint addressing style, either `virtual_hosted` or `path`. Defaults to `virtual_hosted`. > > - Option `headers/1`: Optional extra normalized request headers. When present they are signed into the URL and must be reproduced by the eventual caller. > > - Option `payload_hash_mode/1`: Presigned URLs default to `payload_hash_mode(unsigned)`. Use `signed` together with `payload_hash/1` to sign a precomputed payload hash. > > - Option `payload_hash/1`: Precomputed hexadecimal SHA-256 payload hash required when `payload_hash_mode(signed)` is selected. > > - Option `request_time/1`: Optional explicit local request time as `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`. > > - Option `utc_offset_seconds/1`: UTC offset used to derive the signing time from the local clock. Defaults to `0`. > > - Option `amz_date/1`: Optional explicit AWS SigV4 timestamp overriding any derived request time. > > - Option `expires/1`: Presigned URL lifetime in seconds. Defaults to `900` and must not exceed `604800`. ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `s3_session(HTTPTransport)` - `HTTPTransport` - The object implementing `http_transport_protocol`. Explicit S3 client sessions carrying default request options. **Availability:** `logtalk_load(s3(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** list s3_client(HTTPTransport) url(Representation) **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `get_object/6` - `open/1` - `open/2` - `close/1` - `list_buckets/3` - `head_bucket/4` - `list_objects_v2/5` - `head_object/5` - `presigned_get_object/5` - `presigned_put_object/5` - `presigned_post_object/5` - `put_object/7` - `delete_object/5` - `copy_object/6` - Protected predicates - Private predicates - `session_seed_/1` - `session_state_/2` - Operators ##### Public predicates ###### `get_object/6` Fetches an object into a local file path using session defaults merged with per-call options and returns its response metadata as a separate argument. **Compilation flags:** `static` **Template:** `get_object(Session,Bucket,Key,File,Properties,Options)` **Mode and number of proofs:** `get_object(+compound,+atom,+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` exists but is not a writable file: `domain_error(file([],[write]),File)` The directory `Directory` exists but is not writable: `domain_error(directory([write]),Directory)` The directory `Directory` does not exist: `existence_error(directory,Directory)` The delegated S3 client request failed: `domain_error(s3_http_status,Status)` **Remarks:** > - Option precedence: Per-call options are merged before the stored session defaults, so explicit call options take precedence. > > - Option `credentials/1`: Access credentials as `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`. > > - Option `session_token/1`: Optional session token for temporary credentials. > > - Option `region/1`: AWS region to use when `endpoint/1` is absent. > > - Option `endpoint/1`: Optional custom S3-compatible endpoint URL. > > - Option `addressing_style/1`: Endpoint addressing style, either `virtual_hosted` or `path`. > > - Option `headers/1`: Optional extra normalized HTTP request headers. > > - Option `version/1`: HTTP protocol version as `http(Major,`` ``Minor)`. > > - Option `properties/1`: Optional extra normalized HTTP request properties. > > - Option `connection_options/1`: Optional transport-specific HTTP client options. > > - Option `payload_hash_mode/1`: Payload signing mode, either `signed` or `unsigned`. > > - Option `request_time/1`: Optional explicit local request time as `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`. > > - Option `utc_offset_seconds/1`: UTC offset used to derive the signing time from the local clock. > > - Option `amz_date/1`: Optional explicit AWS SigV4 timestamp overriding any derived request time. ------------------------------------------------------------------------ ###### `open/1` Opens a new S3 client session with no default options. **Compilation flags:** `static` **Template:** `open(Session)` **Mode and number of proofs:** `open(-compound)` - `one_or_error` **Exceptions:** ------------------------------------------------------------------------ ###### `open/2` Opens a new S3 client session with the given default options. **Compilation flags:** `static` **Template:** `open(Session,Options)` **Mode and number of proofs:** `open(-compound,+list(compound))` - `one_or_error` **Exceptions:** `Options` contains an invalid S3 session option: `domain_error(option,Option)` **Remarks:** > - Option role: `Options` stores default request options reused by later session calls. > > - Option `credentials/1`: Default access credentials as `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`. > > - Option `session_token/1`: Optional default session token for temporary credentials. > > - Option `region/1`: Default AWS region to use when `endpoint/1` is absent. > > - Option `endpoint/1`: Optional default custom S3-compatible endpoint URL. > > - Option `addressing_style/1`: Default endpoint addressing style, either `virtual_hosted` or `path`. > > - Option `headers/1`: Optional default normalized HTTP request headers. > > - Option `version/1`: Default HTTP protocol version as `http(Major,`` ``Minor)`. > > - Option `properties/1`: Optional default normalized HTTP request properties. > > - Option `connection_options/1`: Optional default transport-specific HTTP client options. > > - Option `payload_hash_mode/1`: Default payload signing mode, either `signed` or `unsigned`. > > - Option `request_time/1`: Optional default local request time as `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`. > > - Option `utc_offset_seconds/1`: Default UTC offset used to derive the signing time from the local clock. > > - Option `amz_date/1`: Optional default AWS SigV4 timestamp overriding any derived request time. ------------------------------------------------------------------------ ###### `close/1` Closes a S3 client session. **Compilation flags:** `static` **Template:** `close(Session)` **Mode and number of proofs:** `close(+compound)` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` ------------------------------------------------------------------------ ###### `list_buckets/3` Lists accessible buckets using session defaults merged with per-call options. **Compilation flags:** `static` **Template:** `list_buckets(Session,Buckets,Options)` **Mode and number of proofs:** `list_buckets(+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Options` contains an invalid S3 session option: `domain_error(option,Option)` The delegated S3 client request failed: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` and are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ###### `head_bucket/4` Returns bucket metadata using session defaults merged with per-call options. **Compilation flags:** `static` **Template:** `head_bucket(Session,Bucket,Metadata,Options)` **Mode and number of proofs:** `head_bucket(+compound,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` The delegated S3 client request failed: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` and are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ###### `list_objects_v2/5` Lists objects using session defaults merged with per-call options. **Compilation flags:** `static` **Template:** `list_objects_v2(Session,Bucket,Request,Listing,Options)` **Mode and number of proofs:** `list_objects_v2(+compound,+atom,+compound,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Request` is a variable: `instantiation_error` An element `Option` of the request option list is a variable: `instantiation_error` An element `Option` of the request option list is neither a variable nor a compound term: `type_error(compound,Option)` `Request` is not a valid ListObjectsV2 request term or option list: `domain_error(s3_list_objects_request,Request)` An element `Option` of the request option list is a compound term but not a valid ListObjectsV2 request option: `domain_error(s3_list_objects_request_option,Option)` The delegated S3 client request failed: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` and are merged before the stored session defaults, so explicit call options take precedence. The `Request` argument carries the ListObjectsV2-specific request terms. ------------------------------------------------------------------------ ###### `head_object/5` Returns object metadata using session defaults merged with per-call options. **Compilation flags:** `static` **Template:** `head_object(Session,Bucket,Key,Metadata,Options)` **Mode and number of proofs:** `head_object(+compound,+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atom: `type_error(atom,Key)` The delegated S3 client request failed: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` and are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ###### `presigned_get_object/5` Generates a presigned download URL using session defaults merged with per-call options. **Compilation flags:** `static` **Template:** `presigned_get_object(Session,Bucket,Key,URL,Options)` **Mode and number of proofs:** `presigned_get_object(+compound,+atom,+atom,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atom: `type_error(atom,Key)` The delegated S3 client request failed: `domain_error(s3_client_option,Option)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` plus `expires(Seconds)` for the URL lifetime and `payload_hash(Hash)` when `payload_hash_mode(signed)` is selected. Presigned URLs default to `payload_hash_mode(unsigned)`. Options are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ###### `presigned_put_object/5` Generates a presigned upload URL using session defaults merged with per-call options. **Compilation flags:** `static` **Template:** `presigned_put_object(Session,Bucket,Key,URL,Options)` **Mode and number of proofs:** `presigned_put_object(+compound,+atom,+atom,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atom: `type_error(atom,Key)` The delegated S3 client request failed: `domain_error(s3_client_option,Option)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` plus `expires(Seconds)` for the URL lifetime and `payload_hash(Hash)` when `payload_hash_mode(signed)` is selected. Presigned URLs default to `payload_hash_mode(unsigned)`. Options are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ###### `presigned_post_object/5` Generates a presigned POST URL using session defaults merged with per-call options. **Compilation flags:** `static` **Template:** `presigned_post_object(Session,Bucket,Key,URL,Options)` **Mode and number of proofs:** `presigned_post_object(+compound,+atom,+atom,-atom,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atom: `type_error(atom,Key)` The delegated S3 client request failed: `domain_error(s3_client_option,Option)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` plus `expires(Seconds)` for the URL lifetime and `payload_hash(Hash)` when `payload_hash_mode(signed)` is selected. Presigned URLs default to `payload_hash_mode(unsigned)`. Options are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ###### `put_object/7` Uploads a local file path using session defaults merged with per-call options and returns the object ETag and response metadata as separate arguments. **Compilation flags:** `static` **Template:** `put_object(Session,Bucket,Key,File,ETag,Properties,Options)` **Mode and number of proofs:** `put_object(+compound,+atom,+atom,+atom,-atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atom: `type_error(atom,Key)` `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` exists but is not a readable file: `domain_error(file([],[read]),File)` The file `File` does not exist: `existence_error(file,File)` The delegated S3 client request failed: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` and are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ###### `delete_object/5` Deletes an object using session defaults merged with per-call options, returning `delete_result(Properties)`. **Compilation flags:** `static` **Template:** `delete_object(Session,Bucket,Key,Result,Options)` **Mode and number of proofs:** `delete_object(+compound,+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atom: `type_error(atom,Key)` The delegated S3 client request failed: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` and are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ###### `copy_object/6` Copies an object using session defaults merged with per-call options, returning `copy_result(ETag,`` ``Properties)`. **Compilation flags:** `static` **Template:** `copy_object(Session,Source,Bucket,Key,Result,Options)` **Mode and number of proofs:** `copy_object(+compound,+compound,+atom,+atom,-compound,+list(compound))` - `one_or_error` **Exceptions:** `Session` is a variable: `instantiation_error` `Session` is neither a variable nor a valid S3 session handle: `domain_error(s3_session,Session)` `Session` is a valid S3 session handle but not open: `existence_error(s3_session,Session)` `Bucket` is a variable: `instantiation_error` `Source` is a variable: `instantiation_error` The version identifier in `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a compound term: `type_error(compound,Source)` `Bucket` is neither a variable nor an atom: `type_error(atom,Bucket)` The version identifier in `Source` is neither a variable nor an atom: `type_error(atom,VersionId)` `Source` is a compound term but not a valid copy source term: `domain_error(s3_copy_source,Source)` `Bucket` is an atom but not a valid S3 bucket: `domain_error(s3_bucket,Bucket)` The version identifier in `Source` is an atom but not a valid version identifier: `domain_error(s3_version_id,VersionId)` `Key` is a variable: `instantiation_error` `Key` is neither a variable nor an atom: `type_error(atom,Key)` The delegated S3 client request failed: `domain_error(s3_http_status,Status)` **Remarks:** > - Options: Per-call options accept the same terms as `open/2` and are merged before the stored session defaults, so explicit call options take precedence. ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `session_seed_/1` Dynamic counter used to generate fresh session identifiers. **Compilation flags:** `dynamic` **Template:** `session_seed_(SessionId)` **Mode and number of proofs:** `session_seed_(?positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `session_state_/2` Dynamic mapping between session identifiers and their stored default option lists. **Compilation flags:** `dynamic` **Template:** `session_state_(SessionId,Options)` **Mode and number of proofs:** `session_state_(?positive_integer,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **object** #### `s3_signing` AWS Signature Version 4 helpers specialized for S3. **Availability:** `logtalk_load(s3(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** date hmac http_core list os sha256 term_io user **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `payload_hash/2` - `canonical_query/2` - `canonical_request/6` - `sign_request/8` - `presigned_query_pairs/7` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `payload_hash/2` Returns the hexadecimal SHA-256 payload hash for a normalized HTTP body term. **Compilation flags:** `static` **Template:** `payload_hash(Body,Hash)` **Mode and number of proofs:** `payload_hash(+compound,-atom)` - `one_or_error` **Exceptions:** `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` No registered HTTP body codec exists for the body media type when codec-based encoding is required: `existence_error(http_body_codec,MediaType)` ------------------------------------------------------------------------ ###### `canonical_query/2` Returns the canonical AWS SigV4 query string for the given name-value pairs. **Compilation flags:** `static` **Template:** `canonical_query(Pairs,Query)` **Mode and number of proofs:** `canonical_query(+list(pair),-atom)` - `one_or_error` **Exceptions:** `Pairs` is not a valid list of canonical query pairs: `domain_error(s3_query_pairs,Pairs)` ------------------------------------------------------------------------ ###### `canonical_request/6` Builds the canonical request string for the given method, URI, query pairs, signed headers, and payload hash. **Compilation flags:** `static` **Template:** `canonical_request(Method,CanonicalURI,QueryPairs,Headers,PayloadHash,CanonicalRequest)` **Mode and number of proofs:** `canonical_request(+atom,+atom,+list(pair),+list(compound),+atom,-atom)` - `one_or_error` **Exceptions:** `Method` is not a supported HTTP method for this helper: `domain_error(s3_method,Method)` `QueryPairs` is not a valid list of canonical query pairs: `domain_error(s3_query_pairs,QueryPairs)` ------------------------------------------------------------------------ ###### `sign_request/8` Signs an S3 request and returns the final normalized header list. **Compilation flags:** `static` **Template:** `sign_request(Method,HostHeader,CanonicalURI,QueryPairs,Body,Headers,SignedHeaders,Options)` **Mode and number of proofs:** `sign_request(+atom,+atom,+atom,+list(pair),+compound,+list(compound),-list(compound),+list(compound))` - `one_or_error` **Exceptions:** `Options` is missing valid credentials: `domain_error(s3_credentials,missing)` `Body` is not a valid normalized HTTP body term: `domain_error(http_body,Body)` `Headers` contains a managed or invalid signed header: `domain_error(s3_managed_header,Header)` The signing timestamp is invalid: `domain_error(s3_amz_date,AmzDate)` **Remarks:** > - Option `credentials/1`: Required access credentials as `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`. > > - Option `session_token/1`: Optional session token for temporary credentials. > > - Option `region/1`: AWS region for the credential scope. Defaults to `us-east-1`. > > - Option `payload_hash_mode/1`: Payload signing mode, either `signed` or `unsigned`. Defaults to `signed`. > > - Option `request_time/1`: Optional explicit local request time as `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`. > > - Option `utc_offset_seconds/1`: UTC offset used to derive the signing time from the local clock. Defaults to `0`. > > - Option `amz_date/1`: Optional explicit AWS SigV4 timestamp overriding any derived request time. ------------------------------------------------------------------------ ###### `presigned_query_pairs/7` Signs an S3 request for query-string authentication and returns the final canonical query pairs, including the signature. **Compilation flags:** `static` **Template:** `presigned_query_pairs(Method,HostHeader,CanonicalURI,QueryPairs,Headers,SignedQueryPairs,Options)` **Mode and number of proofs:** `presigned_query_pairs(+atom,+atom,+atom,+list(pair),+list(compound),-list(pair),+list(compound))` - `one_or_error` **Exceptions:** `Options` is missing valid credentials: `domain_error(s3_credentials,missing)` `Headers` contains a managed or invalid signed header: `domain_error(s3_managed_header,Header)` The signing timestamp is invalid: `domain_error(s3_amz_date,AmzDate)` The expiration is invalid or outside the AWS SigV4 range: `domain_error(s3_presign_expires,Expires)` The payload hash is missing, invalid, or incompatible with unsigned mode: `domain_error(s3_presign_payload_hash,Hash)` **Remarks:** > - Option `credentials/1`: Required access credentials as `credentials(access_key_id(AccessKeyId),`` ``secret_access_key(SecretAccessKey))`. > > - Option `session_token/1`: Optional session token for temporary credentials. It is emitted as the `X-Amz-Security-Token` query parameter. > > - Option `region/1`: AWS region for the credential scope. Defaults to `us-east-1`. > > - Option `payload_hash_mode/1`: Presigned URLs default to `unsigned` payload hashing and use `UNSIGNED-PAYLOAD`. Use `signed` together with `payload_hash/1` to sign a precomputed payload hash. > > - Option `payload_hash/1`: Precomputed hexadecimal SHA-256 payload hash required when `payload_hash_mode(signed)` is selected. > > - Option `request_time/1`: Optional explicit local request time as `date_time(Year,`` ``Month,`` ``Day,`` ``Hours,`` ``Minutes,`` ``Seconds)`. > > - Option `utc_offset_seconds/1`: UTC offset used to derive the signing time from the local clock. Defaults to `0`. > > - Option `amz_date/1`: Optional explicit AWS SigV4 timestamp overriding any derived request time. > > - Option `expires/1`: Presigned URL lifetime in seconds. Defaults to `900` and must not exceed `604800`. ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `s3_xml` Adapter layer mapping S3 XML responses to stable library terms. **Availability:** `logtalk_load(s3(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-09 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list user xml **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `list_buckets_response/2` - `list_objects_v2_response/2` - `copy_object_response/2` - `create_multipart_upload_response/2` - `error_response/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `list_buckets_response/2` Parses a ListBuckets XML response body. **Compilation flags:** `static` **Template:** `list_buckets_response(Body,Buckets)` **Mode and number of proofs:** `list_buckets_response(+compound,-compound)` - `one_or_error` **Exceptions:** `Body` is not a supported XML response body term: `domain_error(s3_xml_body,Body)` The XML document is malformed or missing required elements: `domain_error(s3_xml_document,Codes)` ------------------------------------------------------------------------ ###### `list_objects_v2_response/2` Parses a ListObjectsV2 XML response body. **Compilation flags:** `static` **Template:** `list_objects_v2_response(Body,Listing)` **Mode and number of proofs:** `list_objects_v2_response(+compound,-compound)` - `one_or_error` **Exceptions:** `Body` is not a supported XML response body term: `domain_error(s3_xml_body,Body)` The XML document is malformed or missing required elements: `domain_error(s3_xml_document,Codes)` ------------------------------------------------------------------------ ###### `copy_object_response/2` Parses a CopyObject XML response body. **Compilation flags:** `static` **Template:** `copy_object_response(Body,Result)` **Mode and number of proofs:** `copy_object_response(+compound,-compound)` - `one_or_error` **Exceptions:** `Body` is not a supported XML response body term: `domain_error(s3_xml_body,Body)` The XML document is malformed or missing required elements: `domain_error(s3_xml_document,Codes)` ------------------------------------------------------------------------ ###### `create_multipart_upload_response/2` Parses a CreateMultipartUpload XML response body. **Compilation flags:** `static` **Template:** `create_multipart_upload_response(Body,Result)` **Mode and number of proofs:** `create_multipart_upload_response(+compound,-compound)` - `one_or_error` **Exceptions:** `Body` is not a supported XML response body term: `domain_error(s3_xml_body,Body)` The XML document is malformed or missing required elements: `domain_error(s3_xml_document,Codes)` ------------------------------------------------------------------------ ###### `error_response/2` Parses an S3 XML error response body. **Compilation flags:** `static` **Template:** `error_response(Body,Error)` **Mode and number of proofs:** `error_response(+compound,-compound)` - `zero_or_one_or_error` **Exceptions:** `Body` is not a supported XML response body term: `domain_error(s3_xml_body,Body)` The XML document is malformed or missing required elements: `domain_error(s3_xml_document,Codes)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### sarif") **object** #### `sarif` Shared SARIF report generator for tools implementing the diagnostics protocol. **Availability:** `logtalk_load(sarif(loader))` **Author:** Paulo Moura **Version:** 1:1:1 **Date:** 2026-07-19 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** atom git json(ObjectRepresentation,PairRepresentation,StringRepresentation) list logtalk os reader term_io type url(Representation) user uuid **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `term/2` - `term/4` - `generate/2` - `generate/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `term/2` Returns a SARIF 2.1.0 report term for the given list of diagnostics tool specifications. Each specification must be a `tool_spec(Tool,`` ``Target,`` ``Options)` term. **Compilation flags:** `static` **Template:** `term(Specs,Term)` **Mode and number of proofs:** `term(+list(compound),-compound)` - `one` ------------------------------------------------------------------------ ###### `term/4` Returns a SARIF 2.1.0 report term for a diagnostics tool target using the given options. **Compilation flags:** `static` **Template:** `term(Tool,Target,Term,Options)` **Mode and number of proofs:** `term(+object_identifier,+nonvar,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `generate/2` Generates a SARIF 2.1.0 report for the given list of diagnostics tool specifications and sink accepted by the json library. Each specification must be a `tool_spec(Tool,`` ``Target,`` ``Options)` term. **Compilation flags:** `static` **Template:** `generate(Specs,Sink)` **Mode and number of proofs:** `generate(+list(compound),++compound)` - `one` ------------------------------------------------------------------------ ###### `generate/4` Generates a SARIF 2.1.0 report for a diagnostics tool target using the given options and sink accepted by the json library. **Compilation flags:** `static` **Template:** `generate(Tool,Target,Sink,Options)` **Mode and number of proofs:** `generate(+object_identifier,+nonvar,++compound,+list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### sbom") **object** #### `sbom` This tool generates a Software Bill of Materials (SBOM) for an application. **Availability:** `logtalk_load(sbom(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-06-15 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** json json_schema list os packs term_io url(Representation) user uuid **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `document/2` - `document/1` - `export/2` - `export/1` - Protected predicates - Private predicates - `spdx_license_schema_/1` - Operators ##### Public predicates ###### `document/2` Returns an SPDX 2.3 or a CycloneDX 1.6 JSON term describing the currently loaded application using the given options. The JSON term represents objects using curly terms, pairs using a dash, and strings using atoms. **Compilation flags:** `static` **Template:** `document(Document,Options)` **Mode and number of proofs:** `document(-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `document/1` Returns an SPDX 2.3 JSON term describing the currently loaded application using default options. The JSON term represents objects using curly terms, pairs using a dash, and strings using atoms. **Compilation flags:** `static` **Template:** `document(Document)` **Mode and number of proofs:** `document(-compound)` - `one` ------------------------------------------------------------------------ ###### `export/2` Exports an SPDX 2.3 or a CycloneDX 1.6 JSON document describing the currently loaded application to the specified sink using the given options. Valid sinks are `codes(List)`, `stream(Stream)`, `file(Path)`, `chars(List)`, and `atom(Atom)`. **Compilation flags:** `static` **Template:** `export(Sink,Options)` **Mode and number of proofs:** `export(++compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `export/1` Exports an SPDX 2.3 JSON document describing the currently loaded application to the specified sink using default options. Valid sinks are `codes(List)`, `stream(Stream)`, `file(Path)`, `chars(List)`, and `atom(Atom)`. **Compilation flags:** `static` **Template:** `export(Sink)` **Mode and number of proofs:** `export(++compound)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `spdx_license_schema_/1` Caches the parsed schema used to validate SPDX license identifiers for CycloneDX exports. **Compilation flags:** `dynamic` **Template:** `spdx_license_schema_(Schema)` **Mode and number of proofs:** `spdx_license_schema_(-term)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) ### schulze_ranker") **object** #### `schulze_ranker` Schulze pairwise preference ranker. Learns one deterministic score per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by computing strongest paths over aggregated head-to-head outcomes and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(schulze_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common `public` condorcet_victory_common **Uses:** avltree list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - `strongest_paths/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `strongest_paths/2` Returns the labeled strongest-path relation as `path(Item1,Item2,Strength)` terms for all ordered pairs of distinct learned items. **Compilation flags:** `static` **Template:** `strongest_paths(Ranker,StrongestPaths)` **Mode and number of proofs:** `strongest_paths(+compound,-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, copeland_ranker, borda_ranker ### sequential_pattern_mining_protocols") **protocol** #### `sequence_dataset_protocol` Protocol for ordered sequence datasets used with sequential pattern mining algorithms. Sequence identifiers are expected to be unique within a dataset. **Availability:** `logtalk_load(sequential_pattern_mining_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-29 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `items/1` - `sequence/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `items/1` Returns the declared sequence item domain as a canonical sorted list of unique items. **Compilation flags:** `static` **Template:** `items(Items)` **Mode and number of proofs:** `items(-list(atom))` - `one` ------------------------------------------------------------------------ ###### `sequence/2` Enumerates by backtracking the sequences in the dataset. The sequence identifier is expected to be unique within the dataset. Each sequence is represented as an ordered list of canonical sorted itemsets with unique declared items. **Compilation flags:** `static` **Template:** `sequence(Id,Sequence)` **Mode and number of proofs:** `sequence(-integer,-list(list(atom)))` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `sequential_pattern_mining_common` Shared predicates for sequential pattern miner dataset validation, support counting, and pattern ordering helpers. **Availability:** `logtalk_load(sequential_pattern_mining_protocols(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-29 **Compilation flags:** `static` **Extends:** `public` pattern_miner_common **Uses:** list type **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - `check_sequences/4` - `pattern_length/2` - `sort_patterns/2` - `filter_patterns/3` - `count_items/4` - `select_frequent_item_supports/3` - `sort_item_supports/2` - `valid_sequence_patterns/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `check_sequences/4` Validates the collected dataset sequences and returns the maximum total sequence length. **Compilation flags:** `static` **Template:** `check_sequences(Dataset,ItemDomain,Sequences,MaxSequenceLength)` **Mode and number of proofs:** `check_sequences(+object_identifier,+list(atom),+list(pair(integer,list(list(atom)))),-integer)` - `one` ------------------------------------------------------------------------ ###### `pattern_length/2` Computes the total number of items in a sequential pattern. **Compilation flags:** `static` **Template:** `pattern_length(Pattern,PatternLength)` **Mode and number of proofs:** `pattern_length(+list(list(atom)),-integer)` - `one` ------------------------------------------------------------------------ ###### `sort_patterns/2` Sorts sequence patterns first by total item count and then lexicographically. **Compilation flags:** `static` **Template:** `sort_patterns(Patterns0,Patterns)` **Mode and number of proofs:** `sort_patterns(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `filter_patterns/3` Filters sequence patterns by minimum total item count. **Compilation flags:** `static` **Template:** `filter_patterns(Patterns0,MinimumPatternLength,Patterns)` **Mode and number of proofs:** `filter_patterns(+list(compound),+integer,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `count_items/4` Accumulates support counts for a list of items. **Compilation flags:** `static` **Template:** `count_items(Items,Count,ItemCounts0,ItemCounts)` **Mode and number of proofs:** `count_items(+list(atom),+integer,+list(pair(atom,integer)),-list(pair(atom,integer)))` - `one` ------------------------------------------------------------------------ ###### `select_frequent_item_supports/3` Selects the item supports that satisfy the minimum support count. **Compilation flags:** `static` **Template:** `select_frequent_item_supports(ItemCounts,SupportCount,FrequentItemSupports)` **Mode and number of proofs:** `select_frequent_item_supports(+list(pair(atom,integer)),+integer,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `sort_item_supports/2` Sorts item supports lexicographically by item. **Compilation flags:** `static` **Template:** `sort_item_supports(ItemSupports0,ItemSupports)` **Mode and number of proofs:** `sort_item_supports(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `valid_sequence_patterns/2` True when the patterns are valid `sequence_pattern(Pattern,`` ``Support)` terms over the given item domain with positive integer supports. **Compilation flags:** `static` **Template:** `valid_sequence_patterns(ItemDomain,Patterns)` **Mode and number of proofs:** `valid_sequence_patterns(+list(atom),+list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### sets") **object** #### `set` Set predicates implemented using ordered lists. Uses `==/2` for element comparison and standard term ordering. **Availability:** `logtalk_load(sets(loader))` **Author:** Richard O’Keefe (main predicates); adapted to Logtalk by Paulo Moura. **Version:** 2:0:0 **Date:** 2025-07-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` setp **Extends:** `public` compound **Aliases:** `setp` `size/2` as `length/2` **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_list/2  as_set/2  check/1  delete/3  depth/2  disjoint/2  empty/1  equal/2  ground/1  insert/3  insert_all/3  intersect/2  intersection/3  intersection/4  member/2  memberchk/2  new/1  numbervars/1  numbervars/3  occurs/2  powerset/2  product/3  select/3  selectchk/3  singletons/2  size/2  subset/2  subsumes/2  subterm/2  subtract/3  symdiff/3  union/3  union/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also set(Type), treap_set **object** #### `set(Type)` Set predicates with elements constrained to a single type and custom comparing rules. **Availability:** `logtalk_load(sets(loader))` **Author:** Paulo Moura and Adrian Arroyo **Version:** 1:24:0 **Date:** 2022-02-03 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` set **Uses:** list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_list/2  as_set/2  check/1  delete/3  depth/2  disjoint/2  empty/1  equal/2  ground/1  insert/3  insert_all/3  intersect/2  intersection/3  intersection/4  member/2  memberchk/2  new/1  numbervars/1  numbervars/3  occurs/2  powerset/2  product/3  select/3  selectchk/3  singletons/2  size/2  subset/2  subsumes/2  subterm/2  subtract/3  symdiff/3  union/3  union/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - `sort/2` - `partition/4` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `sort/2` Sorts a list in ascending order. **Compilation flags:** `static` **Template:** `sort(List,Sorted)` **Mode and number of proofs:** `sort(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `partition/4` List partition in two sub-lists using a pivot. **Compilation flags:** `static` **Template:** `partition(List,Pivot,Lowers,Biggers)` **Mode and number of proofs:** `partition(+list,+nonvar,-list,-list)` - `one` ------------------------------------------------------------------------ ##### Operators (none) See also set, treap_set **protocol** #### `setp` Set protocol. **Availability:** `logtalk_load(sets(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2025-07-08 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `as_set/2` - `as_list/2` - `delete/3` - `disjoint/2` - `equal/2` - `empty/1` - `insert/3` - `insert_all/3` - `intersect/2` - `intersection/3` - `intersection/4` - `size/2` - `member/2` - `memberchk/2` - `powerset/2` - `product/3` - `select/3` - `selectchk/3` - `subset/2` - `subtract/3` - `symdiff/3` - `union/3` - `union/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `as_set/2` Returns a set with all unique elements from the given list. **Compilation flags:** `static` **Template:** `as_set(List,Set)` **Mode and number of proofs:** `as_set(@list,-set)` - `one` ------------------------------------------------------------------------ ###### `as_list/2` Returns a list with all elements of the given set. **Compilation flags:** `static` **Template:** `as_list(Set,List)` **Mode and number of proofs:** `as_list(@set,-list)` - `one` ------------------------------------------------------------------------ ###### `delete/3` Deletes an element from a set returning the set of the remaining elements. **Compilation flags:** `static` **Template:** `delete(Set,Element,Remaining)` **Mode and number of proofs:** `delete(@set,@term,-set)` - `one` ------------------------------------------------------------------------ ###### `disjoint/2` True when the two sets have no element in common. **Compilation flags:** `static` **Template:** `disjoint(Set1,Set2)` **Mode and number of proofs:** `disjoint(@set,@set)` - `zero_or_one` ------------------------------------------------------------------------ ###### `equal/2` True when the two sets are equal. **Compilation flags:** `static` **Template:** `equal(Set1,Set2)` **Mode and number of proofs:** `equal(@set,@set)` - `zero_or_one` ------------------------------------------------------------------------ ###### `empty/1` True when the set is empty. **Compilation flags:** `static` **Template:** `empty(Set)` **Mode and number of proofs:** `empty(@set)` - `zero_or_one` ------------------------------------------------------------------------ ###### `insert/3` Inserts an element in a set, returning the resulting set. **Compilation flags:** `static` **Template:** `insert(In,Element,Out)` **Mode and number of proofs:** `insert(@set,@term,-set)` - `one` ------------------------------------------------------------------------ ###### `insert_all/3` Inserts all the elements of the list into a set, returning the resulting set. **Compilation flags:** `static` **Template:** `insert_all(List,In,Out)` **Mode and number of proofs:** `insert_all(@list,@set,-set)` - `one` ------------------------------------------------------------------------ ###### `intersect/2` True if the two sets have at least one element in common. **Compilation flags:** `static` **Template:** `intersect(Set1,Set2)` **Mode and number of proofs:** `intersect(@set,@set)` - `zero_or_one` ------------------------------------------------------------------------ ###### `intersection/3` Computes the intersection of `Set1` and `Set2`. **Compilation flags:** `static` **Template:** `intersection(Set1,Set2,Intersection)` **Mode and number of proofs:** `intersection(@set,@set,-set)` - `one` ------------------------------------------------------------------------ ###### `intersection/4` Computes the intersection and the difference between `Set2` and `Set1`. **Compilation flags:** `static` **Template:** `intersection(Set1,Set2,Intersection,Difference)` **Mode and number of proofs:** `intersection(@set,@set,-set,-set)` - `one` ------------------------------------------------------------------------ ###### `size/2` Number of set elements. **Compilation flags:** `static` **Template:** `size(Set,Size)` **Mode and number of proofs:** `size(@set,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `member/2` `Element` is a member of set `Set`. **Compilation flags:** `static` **Template:** `member(Element,Set)` **Mode and number of proofs:** `member(?term,+set)` - `zero_or_more` ------------------------------------------------------------------------ ###### `memberchk/2` True when a term is a member of a set. **Compilation flags:** `static` **Template:** `memberchk(Element,Set)` **Mode and number of proofs:** `memberchk(@term,@set)` - `zero_or_one` ------------------------------------------------------------------------ ###### `powerset/2` Returns the power set of a set, represented as a list of sets. **Compilation flags:** `static` **Template:** `powerset(Set,Powerset)` **Mode and number of proofs:** `powerset(@set,-list(set))` - `one` ------------------------------------------------------------------------ ###### `product/3` Returns the cartesian product of two sets. **Compilation flags:** `static` **Template:** `product(Set1,Set2,Product)` **Mode and number of proofs:** `product(@set,@set,-set)` - `one` ------------------------------------------------------------------------ ###### `select/3` Selects an element from a set, returning the set of remaining elements. **Compilation flags:** `static` **Template:** `select(Element,Set,Remaining)` **Mode and number of proofs:** `select(?term,?set,?set)` - `zero_or_more` ------------------------------------------------------------------------ ###### `selectchk/3` True if an element can be selected from a set, returning the set of remaining elements. **Compilation flags:** `static` **Template:** `selectchk(Element,Set,Remaining)` **Mode and number of proofs:** `selectchk(@term,@set,-set)` - `zero_or_one` ------------------------------------------------------------------------ ###### `subset/2` True if `Subset` is a subset of `Set`. **Compilation flags:** `static` **Template:** `subset(Subset,Set)` **Mode and number of proofs:** `subset(@set,@set)` - `zero_or_one` ------------------------------------------------------------------------ ###### `subtract/3` Computes the set of all the elements of `Set1` which are not also in `Set2`. **Compilation flags:** `static` **Template:** `subtract(Set1,Set2,Difference)` **Mode and number of proofs:** `subtract(@set,@set,-set)` - `one` ------------------------------------------------------------------------ ###### `symdiff/3` Computes the symmetric difference of `Set1` and `Set2`, containing all elements that are not in the sets intersection. **Compilation flags:** `static` **Template:** `symdiff(Set1,Set2,Difference)` **Mode and number of proofs:** `symdiff(@set,@set,-set)` - `one` ------------------------------------------------------------------------ ###### `union/3` Computes the union of `Set1` and `Set2`. **Compilation flags:** `static` **Template:** `union(Set1,Set2,Union)` **Mode and number of proofs:** `union(@set,@set,-set)` - `one` ------------------------------------------------------------------------ ###### `union/4` Computes the union of `Set1` and `Set2` and the difference between `Set2` and `Set1`. **Compilation flags:** `static` **Template:** `union(Set1,Set2,Union,Difference)` **Mode and number of proofs:** `union(@set,@set,-set,-set)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also set, set(Type) **object** #### `treap_set` Set predicates implemented using treaps (tree heaps). A treap is a binary search tree with randomly assigned priorities. Uses `==/2` for element comparison and standard term ordering. **Availability:** `logtalk_load(sets(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-01-28 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` setp **Extends:** `public` compound **Uses:** fast_random(Algorithm) list set **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  as_list/2  as_set/2  check/1  delete/3  depth/2  disjoint/2  empty/1  equal/2  ground/1  insert/3  insert_all/3  intersect/2  intersection/3  intersection/4  member/2  memberchk/2  new/1  numbervars/1  numbervars/3  occurs/2  powerset/2  product/3  select/3  selectchk/3  singletons/2  size/2  subset/2  subsumes/2  subterm/2  subtract/3  symdiff/3  union/3  union/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also set, set(Type) ### sgd_classifier") **object** #### `sgd_classifier` Stochastic gradient descent classifier supporting one-vs-rest linear models with configurable losses including `log_loss`, `hinge`, `squared_hinge`, `modified_huber`, and `perceptron`. **Availability:** `logtalk_load(sgd_classifier(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` probabilistic_classifier_common **Uses:** format linear_algebra list numberlist type **Remarks:** (none) **Inherited public predicates:**  check_classifier/1  check_option/1  check_options/1  classifier_options/2  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict_probabilities/3  print_classifier/1  valid_classifier/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also dataset_protocol, logistic_regression_classifier, linear_svm_classifier, knn_classifier, nearest_centroid_classifier ### simulated_annealing") **object** #### `simulated_annealing(Problem)` - `Problem` - Problem object implementing `simulated_annealing_protocol`. Simulated annealing optimization algorithm using the Xoshiro128++ random number generator. Convenience object that extends `simulated_annealing/2` with the random algorithm bound to `xoshiro128pp`. **Availability:** `logtalk_load(simulated_annealing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-22 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` simulated_annealing(Problem,xoshiro128pp) **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  estimate_temperature/1  estimate_temperature/2  option/2  option/3  run/2  run/3  run/4  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also simulated_annealing(Problem,RandomAlgorithm), simulated_annealing_protocol **object** #### `simulated_annealing(Problem,RandomAlgorithm)` - `Problem` - Problem object implementing `simulated_annealing_protocol`. - `RandomAlgorithm` - Random number generator algorithm for the `fast_random` library (e.g. `xoshiro128pp`, `xoshiro256ss`, `well512a`, …). Simulated annealing optimization algorithm. Parameterized by a problem object implementing the `simulated_annealing_protocol` protocol and by a random number generator algorithm for the `fast_random` library. The algorithm minimizes the energy (cost) function defined by the problem. Custom cooling schedules, stop conditions, delta-energy neighbor generation, progress reporting, and reheating restarts can be defined by the problem object or configured via options; suitable defaults are used otherwise. **Availability:** `logtalk_load(simulated_annealing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-23 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** fast_random(Algorithm) type **Remarks:** > - Algorithm: Simulated annealing is a probabilistic metaheuristic for global optimization. It explores the solution space by iteratively generating neighbor states and accepting them based on an energy-dependent probability that decreases over time as the temperature cools. > > - Acceptance criterion: Uses the standard Boltzmann acceptance criterion: a worse neighbor is accepted with probability `exp(-DeltaE`` ``/`` ``Temperature)`. > > - Default cooling schedule: Geometric cooling: `NewTemp`` ``is`` ``Temp`` ``*`` ``0.995`. Override by defining `cooling_schedule/3` in the problem object. > > - Default stop condition: The search stops when the maximum number of steps is reached or the temperature drops below the minimum temperature. Override by defining `stop_condition/3` in the problem object. > > - Delta-energy optimization: If the problem object defines `neighbor_state/3`, the algorithm uses the returned delta energy directly instead of calling `state_energy/2` on the neighbor. This is useful when computing the energy change is cheaper than recomputing the full energy. > > - Progress reporting: If the problem object defines `progress/5`, it is called periodically with the current step, temperature, best energy, acceptance rate, and improvement rate. The reporting interval is controlled by the `updates(N)` option. A final report is always produced when the loop terminates. > > - Best state tracking: The algorithm tracks the best state found across all iterations and across all restart cycles, not just the final state. > > - Seed control: The `seed(S)` option initializes the random number generator for reproducible runs. > > - Reheating restart: The `restarts(N)` option runs N additional SA cycles after the first. Each restart reheats the temperature to the initial value and begins from the best state found so far, allowing the search to escape local minima. Statistics accumulate across all cycles. > > - Auto-temperature estimation: The `estimate_temperature/1-2` predicates sample random neighbor transitions and compute an initial temperature that would produce a target acceptance rate. This avoids manual tuning of the initial temperature. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `estimate_temperature/1` - `estimate_temperature/2` - `run/2` - `run/3` - `run/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `estimate_temperature/1` Estimates an initial temperature for the problem using default options (200 samples, 80% target acceptance rate). **Compilation flags:** `static` **Template:** `estimate_temperature(Temperature)` **Mode and number of proofs:** `estimate_temperature(-float)` - `one` ------------------------------------------------------------------------ ###### `estimate_temperature/2` Estimates an initial temperature by sampling random neighbor transitions. The temperature is computed so that the Boltzmann acceptance probability for the average uphill move equals the target acceptance rate. Sampling starts from the problem initial state and follows a random walk. **Compilation flags:** `static` **Template:** `estimate_temperature(Temperature,Options)` **Mode and number of proofs:** `estimate_temperature(-float,+list(compound))` - `one` **Remarks:** > - `samples(N)` option: Number of random neighbor transitions to sample (default: `200`). > > - `acceptance_rate(P)` option: Target initial acceptance rate as an integer percentage between 1 and 99 (default: `80`). ------------------------------------------------------------------------ ###### `run/2` Runs the simulated annealing algorithm using default options and returns the best state found and its energy. **Compilation flags:** `static` **Template:** `run(BestState,BestEnergy)` **Mode and number of proofs:** `run(-term,-number)` - `one` ------------------------------------------------------------------------ ###### `run/3` Runs the simulated annealing algorithm using the given options and returns the best state found and its energy. **Compilation flags:** `static` **Template:** `run(BestState,BestEnergy,Options)` **Mode and number of proofs:** `run(-term,-number,+list(compound))` - `one` **Remarks:** > - `max_steps(N)` option: Maximum number of iterations per cycle (default: `10000`). > > - `min_temperature(T)` option: Minimum temperature floor; search stops when temperature drops below this value (default: `0.001`). > > - `updates(N)` option: Number of progress reports during the run. Set to `0` to disable. Progress is reported by calling `progress/5` on the problem object (default: `0`). > > - `seed(S)` option: Positive integer seed for the random number generator, enabling reproducible runs (default: none). > > - `restarts(N)` option: Number of additional SA cycles after the first. Each restart reheats the temperature and begins from the best state found so far (default: `0`). ------------------------------------------------------------------------ ###### `run/4` Runs the simulated annealing algorithm using the given options, returns the best state found and its energy, and returns run statistics. **Compilation flags:** `static` **Template:** `run(BestState,BestEnergy,Statistics,Options)` **Mode and number of proofs:** `run(-term,-number,-list(compound),+list(compound))` - `one` **Remarks:** > - Statistics list: A list of `Key(Value)` pairs: `steps(N)` is the number of steps executed, `acceptances(A)` is the number of accepted moves, `improvements(I)` is the number of moves that improved the best energy, and `final_temperature(T)` is the temperature at termination. ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also simulated_annealing(Problem), simulated_annealing_protocol **protocol** #### `simulated_annealing_protocol` Protocol for simulated annealing problem definitions. A problem object must define the four required predicates and may optionally define predicates to override cooling, stopping, neighbor generation with delta energy, and progress reporting defaults. **Availability:** `logtalk_load(simulated_annealing(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-22 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `initial_state/1` - `neighbor_state/2` - `neighbor_state/3` - `state_energy/2` - `initial_temperature/1` - `cooling_schedule/3` - `stop_condition/3` - `progress/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `initial_state/1` Returns an initial state for the optimization problem. **Compilation flags:** `static` **Template:** `initial_state(State)` **Mode and number of proofs:** `initial_state(-term)` - `one` ------------------------------------------------------------------------ ###### `neighbor_state/2` Generates a neighboring state from the given state. This is the most problem-specific predicate and its definition determines the quality of the search. **Compilation flags:** `static` **Template:** `neighbor_state(State,Neighbor)` **Mode and number of proofs:** `neighbor_state(+term,-term)` - `one` ------------------------------------------------------------------------ ###### `neighbor_state/3` Generates a neighboring state and returns the energy change (delta) directly, avoiding a full energy recomputation. Optional. When not defined by the problem, the algorithm calls `neighbor_state/2` and `state_energy/2` instead. **Compilation flags:** `static` **Template:** `neighbor_state(State,Neighbor,DeltaEnergy)` **Mode and number of proofs:** `neighbor_state(+term,-term,-number)` - `one` ------------------------------------------------------------------------ ###### `state_energy/2` Computes the energy (cost) of the given state. The algorithm minimizes this value. **Compilation flags:** `static` **Template:** `state_energy(State,Energy)` **Mode and number of proofs:** `state_energy(+term,-number)` - `one` ------------------------------------------------------------------------ ###### `initial_temperature/1` Returns the initial temperature for the annealing schedule. Higher temperatures increase the probability of accepting worse solutions early on. **Compilation flags:** `static` **Template:** `initial_temperature(Temperature)` **Mode and number of proofs:** `initial_temperature(-number)` - `one` ------------------------------------------------------------------------ ###### `cooling_schedule/3` Computes the next temperature from the current temperature and step number. Optional. When not defined by the problem, a default geometric cooling schedule is used (`NewTemp`` ``is`` ``Temp`` ``*`` ``0.995`). **Compilation flags:** `static` **Template:** `cooling_schedule(Temperature,Step,NewTemperature)` **Mode and number of proofs:** `cooling_schedule(+number,+non_negative_integer,-number)` - `one` ------------------------------------------------------------------------ ###### `stop_condition/3` True when the search should stop given the current step, temperature, and best energy found so far. Optional. When not defined by the problem, the search runs until the maximum number of steps is reached or the minimum temperature is reached. **Compilation flags:** `static` **Template:** `stop_condition(Step,Temperature,BestEnergy)` **Mode and number of proofs:** `stop_condition(+non_negative_integer,+number,+number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `progress/5` Called periodically to report optimization progress. Optional. When not defined by the problem, progress reporting is skipped. The acceptance and improvement rates are values between 0.0 and 1.0 computed over the interval since the last progress report. **Compilation flags:** `static` **Template:** `progress(Step,Temperature,BestEnergy,AcceptanceRate,ImprovementRate)` **Mode and number of proofs:** `progress(+non_negative_integer,+number,+number,+number,+number)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also simulated_annealing(Problem) ### snowflakeid") **object** #### `snowflakeid` Snowflake ID generator using the Twitter-style profile and atom representation. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` snowflakeid_twitter(atom) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), snowflakeid_twitter, snowflakeid_sonyflake, snowflakeid_instagram **object** #### `snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node)` - `Representation` - Snowflake ID representation. Possible values are `integer`, `atom`, `chars`, and `codes`. - `EpochMilliseconds` - Custom epoch in Unix milliseconds. - `TimeUnitMilliseconds` - Timestamp unit in milliseconds. - `TimestampBits` - Number of timestamp bits. - `NodeBits` - Number of node bits. - `SequenceBits` - Number of sequence bits. - `Node` - Node identifier value. Snowflake ID generic generator. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-03-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` snowflakeid_protocol **Uses:** iso8601 os **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - `last_time_sequence_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `last_time_sequence_/2` Last time and sequence. **Compilation flags:** `dynamic` **Template:** `last_time_sequence_(Time,Sequence)` **Mode and number of proofs:** `last_time_sequence_(?integer,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) See also snowflakeid, snowflakeid_twitter, snowflakeid_sonyflake, snowflakeid_instagram, ksuid(Representation,Alphabet), cuid2(Representation,Size,Alphabet), nanoid(Representation,Size,Alphabet) **object** #### `snowflakeid_instagram` Instagram-style Snowflake profile using atom representation. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` snowflakeid_instagram(atom) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also snowflakeid_instagram(Representation), snowflakeid_twitter, snowflakeid_sonyflake **object** #### `snowflakeid_instagram(Representation)` - `Representation` - Snowflake ID representation. Possible values are `integer`, `atom`, `chars`, and `codes`. Instagram-style Snowflake profile. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-02-27 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` snowflakeid(Representation,1314220021721,1,41,13,10,1) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), snowflakeid_twitter, snowflakeid_sonyflake, snowflakeid_instagram **protocol** #### `snowflakeid_protocol` Snowflake ID generator protocol. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `generate/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `generate/1` Returns a Snowflake ID. **Compilation flags:** `static` **Template:** `generate(ID)` **Mode and number of proofs:** `generate(--ground)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `snowflakeid_sonyflake` Sonyflake-style Snowflake profile using atom representation. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` snowflakeid_sonyflake(atom) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also snowflakeid_sonyflake(Representation), snowflakeid_twitter, snowflakeid_instagram **object** #### `snowflakeid_sonyflake(Representation)` - `Representation` - Snowflake ID representation. Possible values are `integer`, `atom`, `chars`, and `codes`. Sonyflake-style Snowflake profile. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-02-27 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` snowflakeid(Representation,1409529600000,10,39,16,8,1) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), snowflakeid_twitter, snowflakeid_sonyflake, snowflakeid_instagram **object** #### `snowflakeid_twitter` Twitter-style Snowflake profile using atom representation. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` snowflakeid_twitter(atom) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also snowflakeid_twitter(Representation), snowflakeid_sonyflake, snowflakeid_instagram **object** #### `snowflakeid_twitter(Representation)` - `Representation` - Snowflake ID representation. Possible values are `integer`, `atom`, `chars`, and `codes`. Twitter-style Snowflake profile. **Availability:** `logtalk_load(snowflakeid(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-02-27 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` snowflakeid(Representation,1288834974657,1,41,10,12,1) **Remarks:** (none) **Inherited public predicates:**  generate/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), snowflakeid_twitter, snowflakeid_sonyflake, snowflakeid_instagram ### sockets") **object** #### `socket` Portable abstraction over TCP sockets. Provides a high-level API for client and server socket operations that works with selected backend Prolog systems. **Availability:** `logtalk_load(sockets(loader))` **Author:** Paulo Moura **Version:** 0:13:0 **Date:** 2026-04-22 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** list **Remarks:** > - Supported backends: ECLiPSe, GNU Prolog, SICStus Prolog, SWI-Prolog, and Trealla Prolog. > > - Design rationale: Some backends (notably SICStus Prolog) do not provide low-level socket creation predicates that can be separated from binding or connecting. This library therefore provides a higher-level API with `client_open/5` and `server_open/3` that abstracts over these differences. > > - Stream handling: Predicates `client_open/5` and `server_accept/5` return separate input and output streams opened in binary mode. For backends where the same stream is used for bidirectional communication, the same stream handle is returned in both arguments. Use standard stream predicates (`put_byte/2`, `get_byte/2`, `read/2`, `write/2`, etc.) to communicate. > > - Options: Currently options are only defined for the `server_open/3` predicate. This is expected to change in future versions for the other predicates that have an options argument. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `client_open/5` - `client_open/4` - `server_open/4` - `server_open/3` - `server_open/2` - `server_accept/5` - `server_accept/4` - `server_close/1` - `close/2` - `current_host/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `client_open/5` Opens a client connection to the specified host and port using the given options. Returns separate input and output streams for bidirectional communication. The streams are opened by default in binary mode. **Compilation flags:** `static` **Template:** `client_open(Host,Port,InputStream,OutputStream,Options)` **Mode and number of proofs:** `client_open(+atom,+integer,--stream,--stream,+list)` - `one_or_error` **Exceptions:** Connection refused or host not found: `socket_error(Error)` **Remarks:** > - Option `type(binary)`: Open the streams in binary mode. This is the default. > > - Option `type(text)`: Open the streams in text mode. ------------------------------------------------------------------------ ###### `client_open/4` Opens a client connection to the specified host and port using default options. Returns separate input and output streams for bidirectional communication. The streams are opened in binary mode. **Compilation flags:** `static` **Template:** `client_open(Host,Port,InputStream,OutputStream)` **Mode and number of proofs:** `client_open(+atom,+integer,--stream,--stream)` - `one_or_error` **Exceptions:** Connection refused or host not found: `socket_error(Error)` ------------------------------------------------------------------------ ###### `server_open/4` Opens a server socket bound to the specified host and port using the given options. If `Port` is a variable, binds to an available port and unifies `Port` with the port number. Returns a `ServerSocket` handle to use with `server_accept/4`. The default backlog (queue length) for pending connections is 5. Use the option `backlog(N)` to override. This option is not supported and thus ignored by the SICStus Prolog and Trealla Prolog backends. **Compilation flags:** `static` **Template:** `server_open(Host,Port,ServerSocket,Options)` **Mode and number of proofs:** `server_open(+atom,?integer,--compound,+list)` - `one_or_error` **Exceptions:** Port already in use: `socket_error(Error)` ------------------------------------------------------------------------ ###### `server_open/3` Opens a server socket bound to the specified port using the given options. If `Port` is a variable, binds to an available port and unifies `Port` with the port number. Returns a `ServerSocket` handle to use with `server_accept/4`. The default backlog (queue length) for pending connections is 5. Use the option `backlog(N)` to override. This option is not supported and thus ignored by the SICStus Prolog and Trealla Prolog backends. **Compilation flags:** `static` **Template:** `server_open(Port,ServerSocket,Options)` **Mode and number of proofs:** `server_open(?integer,--compound,+list)` - `one_or_error` **Exceptions:** Port already in use: `socket_error(Error)` ------------------------------------------------------------------------ ###### `server_open/2` Opens a server socket bound to the specified port using default options. If `Port` is a variable, binds to an available port and unifies `Port` with the port number. Returns a `ServerSocket` handle to use with `server_accept/4`. The default backlog (queue length) for pending connections is 5. **Compilation flags:** `static` **Template:** `server_open(Port,ServerSocket)` **Mode and number of proofs:** `server_open(?integer,--compound)` - `one_or_error` **Exceptions:** Port already in use: `socket_error(Error)` ------------------------------------------------------------------------ ###### `server_accept/5` Accepts an incoming connection on the server socket, blocking until a client connects, using the given options. Returns separate input and output streams for bidirectional communication and client information as `client(Host,`` ``Port)` or `client(Address)` depending on backend. The streams are opened by default in binary mode. **Compilation flags:** `static` **Template:** `server_accept(ServerSocket,InputStream,OutputStream,ClientInfo,Options)` **Mode and number of proofs:** `server_accept(+compound,--stream,--stream,--compound,+list)` - `one_or_error` **Exceptions:** Invalid server socket: `socket_error(Error)` **Remarks:** > - Option `type(binary)`: Open the streams in binary mode. This is the default. > > - Option `type(text)`: Open the streams in text mode. ------------------------------------------------------------------------ ###### `server_accept/4` Accepts an incoming connection on the server socket, blocking until a client connects, using default options. Returns separate input and output streams for bidirectional communication and client information as `client(Host,`` ``Port)` or `client(Address)` depending on backend. The streams are opened in binary mode. **Compilation flags:** `static` **Template:** `server_accept(ServerSocket,InputStream,OutputStream,ClientInfo)` **Mode and number of proofs:** `server_accept(+compound,--stream,--stream,--compound)` - `one_or_error` **Exceptions:** Invalid server socket: `socket_error(Error)` ------------------------------------------------------------------------ ###### `server_close/1` Closes a server socket. **Compilation flags:** `static` **Template:** `server_close(ServerSocket)` **Mode and number of proofs:** `server_close(+compound)` - `one_or_error` ------------------------------------------------------------------------ ###### `close/2` Closes a client or accepted connection by closing both the input and output streams. If the same stream is used for both, it is closed only once. **Compilation flags:** `static` **Template:** `close(InputStream,OutputStream)` **Mode and number of proofs:** `close(+stream,+stream)` - `one_or_error` ------------------------------------------------------------------------ ###### `current_host/1` Returns the hostname of the current machine. **Compilation flags:** `static` **Template:** `current_host(Host)` **Mode and number of proofs:** `current_host(-atom)` - `one_or_error` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### spade_pattern_miner") **object** #### `spade_pattern_miner` SPADE sequential pattern miner for sequence datasets using vertical occurrence lists. **Availability:** `logtalk_load(spade_pattern_miner(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` sequential_pattern_mining_common **Uses:** avltree format list **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_pattern_miner/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  mine/2  mine/3  option/2  option/3  pattern_miner_options/2  print_pattern_miner/1  valid_option/1  valid_options/1  valid_pattern_miner/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pattern_miner_protocol, sequence_dataset_protocol, prefix_span_pattern_miner, gsp_pattern_miner, clo_span_pattern_miner ### statistics") **object** #### `population` Statistical population represented as a list of numbers. **Availability:** `logtalk_load(statistics(loader))` **Author:** Paulo Moura **Version:** 1:4:0 **Date:** 2026-02-20 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` statistics **Remarks:** (none) **Inherited public predicates:**  arithmetic_mean/2  average_deviation/3  central_moment/3  coefficient_of_variation/2  correlation/3  covariance/3  fractile/3  frequency_distribution/2  geometric_mean/2  harmonic_mean/2  interquartile_range/2  kurtosis/2  max/2  mean_deviation/2  mean_squared_error/3  median/2  median_deviation/2  min/2  min_max/3  min_max_normalization/2  modes/2  percentile/3  product/2  quartiles/4  range/2  rank_correlation/3  relative_standard_deviation/2  root_mean_squared_error/3  skewness/2  standard_deviation/2  standard_error/2  sum/2  sum_of_squares/2  trimmed_mean/3  valid/1  variance/2  weighted_mean/3  z_normalization/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also sample **object** #### `sample` Statistical sample represented as a list of numbers. **Availability:** `logtalk_load(statistics(loader))` **Author:** Paulo Moura **Version:** 1:5:0 **Date:** 2026-02-20 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` statistics **Remarks:** (none) **Inherited public predicates:**  arithmetic_mean/2  average_deviation/3  central_moment/3  coefficient_of_variation/2  correlation/3  covariance/3  fractile/3  frequency_distribution/2  geometric_mean/2  harmonic_mean/2  interquartile_range/2  kurtosis/2  max/2  mean_deviation/2  mean_squared_error/3  median/2  median_deviation/2  min/2  min_max/3  min_max_normalization/2  modes/2  percentile/3  product/2  quartiles/4  range/2  rank_correlation/3  relative_standard_deviation/2  root_mean_squared_error/3  skewness/2  standard_deviation/2  standard_error/2  sum/2  sum_of_squares/2  trimmed_mean/3  valid/1  variance/2  weighted_mean/3  z_normalization/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also population **category** #### `statistics` Statistical calculations over a list of numbers. **Availability:** `logtalk_load(statistics(loader))` **Author:** Paulo Moura **Version:** 1:8:0 **Date:** 2026-02-20 **Compilation flags:** `static` **Implements:** `public` statisticsp **Uses:** list numberlist **Remarks:** (none) **Inherited public predicates:**  arithmetic_mean/2  average_deviation/3  central_moment/3  coefficient_of_variation/2  correlation/3  covariance/3  fractile/3  frequency_distribution/2  geometric_mean/2  harmonic_mean/2  interquartile_range/2  kurtosis/2  max/2  mean_deviation/2  mean_squared_error/3  median/2  median_deviation/2  min/2  min_max/3  min_max_normalization/2  modes/2  percentile/3  product/2  quartiles/4  range/2  rank_correlation/3  relative_standard_deviation/2  root_mean_squared_error/3  skewness/2  standard_deviation/2  standard_error/2  sum/2  sum_of_squares/2  trimmed_mean/3  valid/1  variance/2  weighted_mean/3  z_normalization/2 - Public predicates - Protected predicates - Private predicates - `arithmetic_mean/5` - `squares_and_cubes/6` - `squares_and_hypers/6` - `variance/6` - `cross_deviation_sum/6` - `sorted_median/3` - `sum_of_squares/4` - `central_moment_sum/7` - `min_max_normalize/4` - `count_frequencies/4` - `squared_error_sum/6` - `compute_ranks/3` - `count_less_equal/6` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `arithmetic_mean/5` Auxiliary predicate for computing the arithmetic mean. **Compilation flags:** `static` **Template:** `arithmetic_mean(List,Length0,Length,Sum,Mean)` **Mode and number of proofs:** `arithmetic_mean(+list(number),+integer,-integer,+number,-float)` - `one` ------------------------------------------------------------------------ ###### `squares_and_cubes/6` Auxiliary predicate for computing the skewness. **Compilation flags:** `static` **Template:** `squares_and_cubes(List,Mean,Squares0,Squares,Cubes0,Cubes)` **Mode and number of proofs:** `squares_and_cubes(+list(number),+float,+float,-float,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `squares_and_hypers/6` Auxiliary predicate for computing the kurtosis. **Compilation flags:** `static` **Template:** `squares_and_hypers(List,Mean,Squares0,Squares,Hypers0,Hypers)` **Mode and number of proofs:** `squares_and_hypers(+list(number),+float,+float,-float,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `variance/6` Auxiliary predicate for computing the variance. **Compilation flags:** `static` **Template:** `variance(List,Length0,Length,Mean,M20,M2)` **Mode and number of proofs:** `variance(+list(number),+integer,-integer,+float,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `cross_deviation_sum/6` Auxiliary predicate for computing the cross-deviation sum for covariance. **Compilation flags:** `static` **Template:** `cross_deviation_sum(List1,List2,Mean1,Mean2,Sum0,Sum)` **Mode and number of proofs:** `cross_deviation_sum(+list(number),+list(number),+float,+float,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `sorted_median/3` Auxiliary predicate for computing the median of an already sorted list with known length. **Compilation flags:** `static` **Template:** `sorted_median(Sorted,Length,Median)` **Mode and number of proofs:** `sorted_median(+list(number),+integer,-number)` - `one` ------------------------------------------------------------------------ ###### `sum_of_squares/4` Auxiliary predicate for computing the sum of squared deviations. **Compilation flags:** `static` **Template:** `sum_of_squares(List,Mean,Sum0,Sum)` **Mode and number of proofs:** `sum_of_squares(+list(number),+float,+float,-float)` - `one` ------------------------------------------------------------------------ ###### `central_moment_sum/7` Auxiliary predicate for computing central moments. **Compilation flags:** `static` **Template:** `central_moment_sum(List,K,Mean,N0,Sum0,N,Sum)` **Mode and number of proofs:** `central_moment_sum(+list(number),+positive_integer,+float,+integer,+float,-integer,-float)` - `one` ------------------------------------------------------------------------ ###### `min_max_normalize/4` Auxiliary predicate for min-max normalization. **Compilation flags:** `static` **Template:** `min_max_normalize(List,Min,Range,NormalizedList)` **Mode and number of proofs:** `min_max_normalize(+list(number),+number,+number,-list(float))` - `one` ------------------------------------------------------------------------ ###### `count_frequencies/4` Auxiliary predicate for computing frequency distribution. **Compilation flags:** `static` **Template:** `count_frequencies(List,CurrentValue,CurrentCount,Distribution)` **Mode and number of proofs:** `count_frequencies(+list(number),+number,+integer,-list(pair(number,integer)))` - `one` ------------------------------------------------------------------------ ###### `squared_error_sum/6` Auxiliary predicate for computing mean squared error. **Compilation flags:** `static` **Template:** `squared_error_sum(List1,List2,N0,Sum0,N,Sum)` **Mode and number of proofs:** `squared_error_sum(+list(number),+list(number),+integer,+float,-integer,-float)` - `one` ------------------------------------------------------------------------ ###### `compute_ranks/3` Auxiliary predicate for computing ranks of elements in a list. **Compilation flags:** `static` **Template:** `compute_ranks(List,All,Ranks)` **Mode and number of proofs:** `compute_ranks(+list(number),+list(number),-list(float))` - `one` ------------------------------------------------------------------------ ###### `count_less_equal/6` Auxiliary predicate for counting elements less than and equal to a value. **Compilation flags:** `static` **Template:** `count_less_equal(List,Value,Less0,Less,Equal0,Equal)` **Mode and number of proofs:** `count_less_equal(+list(number),+number,+integer,-integer,+integer,-integer)` - `one` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `statisticsp` Statistical calculations over a list of numbers protocol. **Availability:** `logtalk_load(statistics(loader))` **Author:** Paulo Moura **Version:** 1:4:0 **Date:** 2026-02-20 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `product/2` - `sum/2` - `min/2` - `max/2` - `min_max/3` - `range/2` - `arithmetic_mean/2` - `geometric_mean/2` - `harmonic_mean/2` - `weighted_mean/3` - `median/2` - `modes/2` - `average_deviation/3` - `mean_deviation/2` - `median_deviation/2` - `standard_deviation/2` - `coefficient_of_variation/2` - `relative_standard_deviation/2` - `skewness/2` - `kurtosis/2` - `variance/2` - `z_normalization/2` - `fractile/3` - `percentile/3` - `quartiles/4` - `interquartile_range/2` - `covariance/3` - `correlation/3` - `rank_correlation/3` - `trimmed_mean/3` - `sum_of_squares/2` - `central_moment/3` - `min_max_normalization/2` - `frequency_distribution/2` - `standard_error/2` - `mean_squared_error/3` - `root_mean_squared_error/3` - `valid/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `product/2` Calculates the product of all list numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `product(List,Product)` **Mode and number of proofs:** `product(+list(number),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sum/2` Calculates the sum of all list numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `sum(List,Sum)` **Mode and number of proofs:** `sum(+list(number),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `min/2` Determines the minimum value in a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `min(List,Minimum)` **Mode and number of proofs:** `min(+list,-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `max/2` Determines the list maximum value in a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `max(List,Maximum)` **Mode and number of proofs:** `max(+list,-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `min_max/3` Determines the minimum and maximum values in a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `min_max(List,Minimum,Maximum)` **Mode and number of proofs:** `min_max(+list(number),-number,-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `range/2` Range is the length of the smallest interval which contains all the numbers in List. Fails if the list is empty. **Compilation flags:** `static` **Template:** `range(List,Range)` **Mode and number of proofs:** `range(+list,-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `arithmetic_mean/2` Calculates the arithmetic mean of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `arithmetic_mean(List,Mean)` **Mode and number of proofs:** `arithmetic_mean(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `geometric_mean/2` Calculates the geometric mean of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `geometric_mean(List,Mean)` **Mode and number of proofs:** `geometric_mean(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `harmonic_mean/2` Calculates the harmonic mean of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `harmonic_mean(List,Mean)` **Mode and number of proofs:** `harmonic_mean(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `weighted_mean/3` Calculates the weighted mean of a list of numbers. Fails if the list is empty or if the two lists have different lengths. Weights are assumed to be non-negative. **Compilation flags:** `static` **Template:** `weighted_mean(Weights,List,Mean)` **Mode and number of proofs:** `weighted_mean(+list(number),+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `median/2` Calculates the median of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `median(List,Median)` **Mode and number of proofs:** `median(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `modes/2` Returns the list of modes of a list of numbers in ascending order. Fails if the list is empty. **Compilation flags:** `static` **Template:** `modes(List,Modes)` **Mode and number of proofs:** `modes(+list(number),-list(number))` - `zero_or_one` ------------------------------------------------------------------------ ###### `average_deviation/3` Calculates the average absolute deviation of a list of numbers given a central tendency (e.g., mean, median, or mode). Fails if the list is empty. **Compilation flags:** `static` **Template:** `average_deviation(List,CentralTendency,Deviation)` **Mode and number of proofs:** `average_deviation(+list(number),+float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `mean_deviation/2` Calculates the mean absolute deviation of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `mean_deviation(List,Deviation)` **Mode and number of proofs:** `mean_deviation(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `median_deviation/2` Calculates the median absolute deviation of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `median_deviation(List,Deviation)` **Mode and number of proofs:** `median_deviation(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `standard_deviation/2` Calculates the standard deviation of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `standard_deviation(List,Deviation)` **Mode and number of proofs:** `standard_deviation(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `coefficient_of_variation/2` Calculates the coefficient of variation of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `coefficient_of_variation(List,Coefficient)` **Mode and number of proofs:** `coefficient_of_variation(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `relative_standard_deviation/2` Calculates the relative standard deviation of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `relative_standard_deviation(List,Percentage)` **Mode and number of proofs:** `relative_standard_deviation(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `skewness/2` Calculates the (moment) skewness of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `skewness(List,Skewness)` **Mode and number of proofs:** `skewness(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `kurtosis/2` Calculates the (excess) kurtosis of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `kurtosis(List,Kurtosis)` **Mode and number of proofs:** `kurtosis(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `variance/2` Calculates the unbiased variance of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `variance(List,Variance)` **Mode and number of proofs:** `variance(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `z_normalization/2` Normalizes a list of number such that for the resulting list the mean of is close to zero and the standard deviation is close to 1. Fails if the list is empty. **Compilation flags:** `static` **Template:** `z_normalization(List,NormalizedList)` **Mode and number of proofs:** `z_normalization(+list(number),-list(float))` - `zero_or_one` ------------------------------------------------------------------------ ###### `fractile/3` Calculates the smallest value in a list of numbers such that the list elements in its fraction `P` are less or equal to that value (with `P` in the open interval `(0.0,`` ``1.0)`). Fails if the list is empty. **Compilation flags:** `static` **Template:** `fractile(P,List,Fractile)` **Mode and number of proofs:** `fractile(+float,+list(integer),-integer)` - `zero_or_one` `fractile(+float,+list(float),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `percentile/3` Calculates the P-th percentile of a list of numbers (with `P` in the open interval `(0,`` ``100)`). Fails if the list is empty. **Compilation flags:** `static` **Template:** `percentile(P,List,Percentile)` **Mode and number of proofs:** `percentile(+number,+list(number),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `quartiles/4` Calculates the quartiles (Q1, Q2, Q3) of a list of numbers. Q2 is the median. Q1 and Q3 are the medians of the lower and upper halves, respectively. Fails if the list has fewer than two elements. **Compilation flags:** `static` **Template:** `quartiles(List,Q1,Q2,Q3)` **Mode and number of proofs:** `quartiles(+list(number),-number,-number,-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `interquartile_range/2` Calculates the interquartile range (Q3 - Q1) of a list of numbers. Fails if the list has fewer than two elements. **Compilation flags:** `static` **Template:** `interquartile_range(List,IQR)` **Mode and number of proofs:** `interquartile_range(+list(number),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `covariance/3` Calculates the covariance of two lists of numbers. Fails if the lists are empty or have different lengths. **Compilation flags:** `static` **Template:** `covariance(List1,List2,Covariance)` **Mode and number of proofs:** `covariance(+list(number),+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `correlation/3` Calculates the Pearson correlation coefficient of two lists of numbers. Fails if the lists are empty or have different lengths. **Compilation flags:** `static` **Template:** `correlation(List1,List2,Correlation)` **Mode and number of proofs:** `correlation(+list(number),+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rank_correlation/3` Calculates the Spearman rank correlation coefficient of two lists of numbers. Handles ties using average ranks. Fails if the lists are empty or have different lengths. **Compilation flags:** `static` **Template:** `rank_correlation(List1,List2,Correlation)` **Mode and number of proofs:** `rank_correlation(+list(number),+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `trimmed_mean/3` Calculates the trimmed mean of a list of numbers by removing a fraction of extreme values from both ends (with the fraction in the half-open interval `[0.0,`` ``0.5)`). Fails if the list is empty or if too many elements would be trimmed. **Compilation flags:** `static` **Template:** `trimmed_mean(Fraction,List,Mean)` **Mode and number of proofs:** `trimmed_mean(+float,+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sum_of_squares/2` Calculates the sum of squared deviations from the arithmetic mean of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `sum_of_squares(List,Sum)` **Mode and number of proofs:** `sum_of_squares(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `central_moment/3` Calculates the K-th central moment of a list of numbers. The K-th central moment is the mean of the deviations from the mean raised to the power K (with `K`` ``>`` ``0`). Fails if the list is empty. **Compilation flags:** `static` **Template:** `central_moment(K,List,Moment)` **Mode and number of proofs:** `central_moment(+positive_integer,+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `min_max_normalization/2` Normalizes a list of numbers to the interval `[0.0,`` ``1.0]` using min-max normalization. Fails if the list is empty or if all values are equal. **Compilation flags:** `static` **Template:** `min_max_normalization(List,NormalizedList)` **Mode and number of proofs:** `min_max_normalization(+list(number),-list(float))` - `zero_or_one` ------------------------------------------------------------------------ ###### `frequency_distribution/2` Computes the frequency distribution of a list of numbers, returning a list of `Value-Count` pairs in ascending order of value. Fails if the list is empty. **Compilation flags:** `static` **Template:** `frequency_distribution(List,Distribution)` **Mode and number of proofs:** `frequency_distribution(+list(number),-list(pair(number,integer)))` - `zero_or_one` ------------------------------------------------------------------------ ###### `standard_error/2` Calculates the standard error of the mean of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `standard_error(List,Error)` **Mode and number of proofs:** `standard_error(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `mean_squared_error/3` Calculates the mean squared error between two lists of numbers. Fails if the lists are empty or have different lengths. **Compilation flags:** `static` **Template:** `mean_squared_error(List1,List2,Error)` **Mode and number of proofs:** `mean_squared_error(+list(number),+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `root_mean_squared_error/3` Calculates the root mean squared error between two lists of numbers. Fails if the lists are empty or have different lengths. **Compilation flags:** `static` **Template:** `root_mean_squared_error(List1,List2,Error)` **Mode and number of proofs:** `root_mean_squared_error(+list(number),+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid/1` Term is a closed list of numbers. **Compilation flags:** `static` **Template:** `valid(Term)` **Mode and number of proofs:** `valid(@nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also statistics, sample, population ### stemming") **object** #### `lovins_stemmer(Representation)` - `Representation` - Word representation. Valid values are `atom`, `codes`, and `chars`. Lovins stemmer algorithm implementation for English words. **Availability:** `logtalk_load(stemming(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-05 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` stemmer_protocol **Uses:** list **Remarks:** > - Algorithm: The Lovins stemming algorithm (Lovins, 1968) removes the longest suffix from a word using a list of 294 endings, each associated with a condition for removal. It then applies transformation rules to fix spelling. > > - Reference: Lovins, J.B. (1968). Development of a stemming algorithm. Mechanical Translation and Computational Linguistics, 11(1-2), 22-31. **Inherited public predicates:**  stem/2  stems/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also stemmer_protocol, porter_stemmer(Representation) **object** #### `porter_stemmer(Representation)` - `Representation` - Word representation. Valid values are `atom`, `codes`, and `chars`. Porter stemmer algorithm implementation for English words. **Availability:** `logtalk_load(stemming(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-05 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` stemmer_protocol **Uses:** integer list **Remarks:** > - Algorithm: The Porter stemming algorithm (Porter, 1980) is a widely used algorithm for reducing English words to their root form by applying a series of rules that remove common suffixes. > > - Reference: Porter, M.F. (1980). An algorithm for suffix stripping. Program, 14(3), 130-137. **Inherited public predicates:**  stem/2  stems/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also stemmer_protocol, lovins_stemmer(Representation) **protocol** #### `stemmer_protocol` Stemmer protocol for reducing words to their stems. **Availability:** `logtalk_load(stemming(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-05 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `stem/2` - `stems/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `stem/2` Stems a single word, returning its root form. **Compilation flags:** `static` **Template:** `stem(Word,Stem)` **Mode and number of proofs:** `stem(+text,-text)` - `one` ------------------------------------------------------------------------ ###### `stems/2` Stems a list of words, returning a list of their root forms. **Compilation flags:** `static` **Template:** `stems(Words,Stems)` **Mode and number of proofs:** `stems(+list(text),-list(text))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also porter_stemmer(Representation), lovins_stemmer(Representation) ### stomp") **object** #### `stomp` Portable STOMP 1.2 (Simple Text Orientated Messaging Protocol) client. Uses the sockets library for TCP communication. **Availability:** `logtalk_load(stomp(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-06-16 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` options **Uses:** list socket term_io user uuid(Representation) **Remarks:** > - Supported backends: ECLiPSe, GNU Prolog, SICStus Prolog, and SWI-Prolog (same as the sockets library). > > - Protocol version: Implements STOMP 1.2 specification. > > - Heartbeat: Supports heartbeat negotiation. Automatic heartbeat sending is not implemented; use send_heartbeat/1 manually if needed. > > - Subscriptions: Supports multiple concurrent subscriptions with unique IDs. > > - Transactions: Supports STOMP transactions with BEGIN, COMMIT, and ABORT. > > - Frame encoding: Properly encodes/decodes header values according to STOMP 1.2 escaping rules. **Inherited public predicates:**  check_option/1  check_options/1  default_option/1  default_options/1  option/2  option/3  valid_option/1  valid_options/1 - Public predicates - `connect/4` - `disconnect/2` - `connection_alive/1` - `send/4` - `subscribe/4` - `unsubscribe/3` - `receive/3` - `ack/3` - `nack/3` - `begin_transaction/3` - `commit_transaction/3` - `abort_transaction/3` - `send_heartbeat/1` - `frame_command/2` - `frame_header/3` - `frame_headers/2` - `frame_body/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `connect/4` Connects to a STOMP server and performs the STOMP handshake. Returns a connection handle for subsequent operations. **Compilation flags:** `static` **Template:** `connect(Host,Port,Connection,Options)` **Mode and number of proofs:** `connect(+atom,+integer,--compound,+list)` - `one_or_error` **Exceptions:** Connection refused or network error: `stomp_error(connection_failed)` Server rejected connection: `stomp_error(protocol_error(Message))` **Remarks:** > - Option login(Login): Username for authentication. > > - Option passcode(Passcode): Password for authentication. > > - Option host(VirtualHost): Virtual host name. Defaults to the Host parameter. > > - Option heartbeat(ClientMs, ServerMs): Heartbeat timing in milliseconds. Default is 0,0 (no heartbeat). ------------------------------------------------------------------------ ###### `disconnect/2` Gracefully disconnects from the STOMP server. Sends DISCONNECT frame and waits for RECEIPT if requested. **Compilation flags:** `static` **Template:** `disconnect(Connection,Options)` **Mode and number of proofs:** `disconnect(+compound,+list)` - `one_or_error` **Exceptions:** `Connection` is not a valid STOMP connection handle: `error` **Remarks:** > - Option receipt(ReceiptId): Request receipt confirmation. Automatically generated if not specified. ------------------------------------------------------------------------ ###### `connection_alive/1` Checks if the connection is still open and valid. **Compilation flags:** `static` **Template:** `connection_alive(Connection)` **Mode and number of proofs:** `connection_alive(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `send/4` Sends a message to the specified destination. **Compilation flags:** `static` **Template:** `send(Connection,Destination,Body,Options)` **Mode and number of proofs:** `send(+compound,+atom,+term,+list)` - `one_or_error` **Exceptions:** `Connection` is invalid, `Body` cannot be encoded, or the SEND frame cannot be transmitted: `stomp_error(error)` **Remarks:** > - Option content_type(MimeType): MIME type of the body. > > - Option content_length(Length): Body length in bytes. Auto-calculated if omitted for atom/string bodies. > > - Option transaction(TransactionId): Include message in the named transaction. > > - Option receipt(ReceiptId): Request receipt confirmation. > > - Option header(Name, Value): Add custom header (can be repeated). ------------------------------------------------------------------------ ###### `subscribe/4` Subscribes to a destination to receive messages. **Compilation flags:** `static` **Template:** `subscribe(Connection,Destination,SubscriptionId,Options)` **Mode and number of proofs:** `subscribe(+compound,+atom,+atom,+list)` - `one_or_error` **Exceptions:** `Connection` is invalid, the acknowledgment mode is unsupported, or the SUBSCRIBE frame cannot be transmitted: `stomp_error(error)` **Remarks:** > - Option ack(Mode): Acknowledgment mode: auto (default), client, or client_individual. ------------------------------------------------------------------------ ###### `unsubscribe/3` Unsubscribes from a destination. **Compilation flags:** `static` **Template:** `unsubscribe(Connection,SubscriptionId,Options)` **Mode and number of proofs:** `unsubscribe(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Connection` is invalid or the UNSUBSCRIBE frame cannot be transmitted: `stomp_error(error)` ------------------------------------------------------------------------ ###### `receive/3` Receives a frame from the server. Returns MESSAGE, RECEIPT, or ERROR frames. **Compilation flags:** `static` **Template:** `receive(Connection,Frame,Options)` **Mode and number of proofs:** `receive(+compound,-compound,+list)` - `zero_or_one_or_error` **Exceptions:** `Connection` is invalid or the input stream does not contain a valid STOMP frame within the requested timeout: `error` **Remarks:** > - Option timeout(Milliseconds): Timeout in milliseconds. 0 for non-blocking, -1 for infinite wait. Default is -1. ------------------------------------------------------------------------ ###### `ack/3` Acknowledges receipt of a message. **Compilation flags:** `static` **Template:** `ack(Connection,AckId,Options)` **Mode and number of proofs:** `ack(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Connection` is invalid or the ACK frame cannot be transmitted: `stomp_error(error)` **Remarks:** > - Option transaction(TransactionId): Include acknowledgment in the named transaction. ------------------------------------------------------------------------ ###### `nack/3` Negatively acknowledges a message (tells server the message was not consumed). **Compilation flags:** `static` **Template:** `nack(Connection,AckId,Options)` **Mode and number of proofs:** `nack(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Connection` is invalid or the NACK frame cannot be transmitted: `stomp_error(error)` **Remarks:** > - Option transaction(TransactionId): Include negative acknowledgment in the named transaction. ------------------------------------------------------------------------ ###### `begin_transaction/3` Begins a new transaction. **Compilation flags:** `static` **Template:** `begin_transaction(Connection,TransactionId,Options)` **Mode and number of proofs:** `begin_transaction(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Connection` is invalid or the BEGIN frame cannot be transmitted: `stomp_error(error)` ------------------------------------------------------------------------ ###### `commit_transaction/3` Commits a transaction, making all its operations permanent. **Compilation flags:** `static` **Template:** `commit_transaction(Connection,TransactionId,Options)` **Mode and number of proofs:** `commit_transaction(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Connection` is invalid or the COMMIT frame cannot be transmitted: `stomp_error(error)` ------------------------------------------------------------------------ ###### `abort_transaction/3` Aborts a transaction, rolling back all its operations. **Compilation flags:** `static` **Template:** `abort_transaction(Connection,TransactionId,Options)` **Mode and number of proofs:** `abort_transaction(+compound,+atom,+list)` - `one_or_error` **Exceptions:** `Connection` is invalid or the ABORT frame cannot be transmitted: `stomp_error(error)` ------------------------------------------------------------------------ ###### `send_heartbeat/1` Sends a heartbeat (EOL) to the server to keep the connection alive. **Compilation flags:** `static` **Template:** `send_heartbeat(Connection)` **Mode and number of proofs:** `send_heartbeat(+compound)` - `one_or_error` **Exceptions:** `Connection` is invalid or the heartbeat cannot be written to the output stream: `stomp_error(error)` ------------------------------------------------------------------------ ###### `frame_command/2` Extracts the command from a frame. **Compilation flags:** `static` **Template:** `frame_command(Frame,Command)` **Mode and number of proofs:** `frame_command(+compound,-atom)` - `one` ------------------------------------------------------------------------ ###### `frame_header/3` Extracts a header value from a frame. Fails if header is not present. **Compilation flags:** `static` **Template:** `frame_header(Frame,HeaderName,Value)` **Mode and number of proofs:** `frame_header(+compound,+atom,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `frame_headers/2` Extracts all headers from a frame as a list of Name-Value pairs. **Compilation flags:** `static` **Template:** `frame_headers(Frame,Headers)` **Mode and number of proofs:** `frame_headers(+compound,-list)` - `one` ------------------------------------------------------------------------ ###### `frame_body/2` Extracts the body from a frame. Returns empty atom if no body. **Compilation flags:** `static` **Template:** `frame_body(Frame,Body)` **Mode and number of proofs:** `frame_body(+compound,-term)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### string_distance") **object** #### `string_distance(Representation)` - `Representation` - String representation. Valid values are `atom`, `codes`, and `chars`. String distance predicates. **Availability:** `logtalk_load(string_distance(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-05-21 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** integer list set **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `levenshtein/3` - `damerau_levenshtein/3` - `hamming/3` - `jaro/3` - `jaro_winkler/3` - `edit_similarity/3` - `edit_similarity/4` - `longest_common_subsequence_length/3` - `longest_common_subsequence/3` - `longest_common_substring/3` - `cosine_similarity/3` - `jaccard_index/3` - `soundex/2` - `soundex_match/2` - `metaphone/2` - `metaphone_match/2` - `double_metaphone/3` - `double_metaphone_match/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `levenshtein/3` Computes the Levenshtein distance between two strings. **Compilation flags:** `static` **Template:** `levenshtein(String1,String2,Distance)` `String1` - First input string. `String2` - Second input string. `Distance` - Minimum number of single-character edits (insertions, deletions, substitutions) to transform `String1` into `String2`. **Mode and number of proofs:** `levenshtein(+text,+text,-integer)` - `one` ------------------------------------------------------------------------ ###### `damerau_levenshtein/3` Computes the Damerau-Levenshtein distance between two strings. **Compilation flags:** `static` **Template:** `damerau_levenshtein(String1,String2,Distance)` `String1` - First input string. `String2` - Second input string. `Distance` - Minimum number of edits (insertions, deletions, substitutions, and adjacent transpositions) to transform `String1` into `String2`. **Mode and number of proofs:** `damerau_levenshtein(+text,+text,-integer)` - `one` ------------------------------------------------------------------------ ###### `hamming/3` Computes the Hamming distance between two strings of equal length. Fails if the strings differ in length. **Compilation flags:** `static` **Template:** `hamming(String1,String2,Distance)` `String1` - First input string. `String2` - Second input string (must have the same length as `String1`). `Distance` - Number of positions at which the corresponding characters differ. **Mode and number of proofs:** `hamming(+text,+text,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `jaro/3` Computes the Jaro similarity score between two strings. **Compilation flags:** `static` **Template:** `jaro(String1,String2,Similarity)` `String1` - First input string. `String2` - Second input string. `Similarity` - A value between 0.0 (completely different) and 1.0 (identical), based on matching characters and transpositions. **Mode and number of proofs:** `jaro(+text,+text,-float)` - `one` ------------------------------------------------------------------------ ###### `jaro_winkler/3` Computes the Jaro-Winkler similarity score between two strings. **Compilation flags:** `static` **Template:** `jaro_winkler(String1,String2,Similarity)` `String1` - First input string. `String2` - Second input string. `Similarity` - A value between 0.0 and 1.0. Extends Jaro similarity with a prefix bonus: strings sharing a common prefix are scored higher. **Mode and number of proofs:** `jaro_winkler(+text,+text,-float)` - `one` ------------------------------------------------------------------------ ###### `edit_similarity/3` Computes the edit similarity score between two strings using Levenshtein distance. **Compilation flags:** `static` **Template:** `edit_similarity(String1,String2,Similarity)` `String1` - First input string. `String2` - Second input string. `Similarity` - A value between 0.0 and 1.0 computed as 1 - (edit distance / max length of the two strings). **Mode and number of proofs:** `edit_similarity(+text,+text,-float)` - `one` ------------------------------------------------------------------------ ###### `edit_similarity/4` Computes the edit similarity score between two strings using the given algorithm. **Compilation flags:** `static` **Template:** `edit_similarity(Algorithm,String1,String2,Similarity)` `Algorithm` - Edit distance algorithm. Valid values are `levenshtein`, `damerau_levenshtein`, `hamming`, and `longest_common_subsequence`. `String1` - First input string. `String2` - Second input string. `Similarity` - A value between 0.0 and 1.0 computed as 1 - (edit distance / max length of the two strings). **Mode and number of proofs:** `edit_similarity(+atom,+text,+text,-float)` - `one` ------------------------------------------------------------------------ ###### `longest_common_subsequence_length/3` Computes the length of the Longest Common Subsequence between two strings. **Compilation flags:** `static` **Template:** `longest_common_subsequence_length(String1,String2,Length)` `String1` - First input string. `String2` - Second input string. `Length` - Length of the longest subsequence common to both strings (characters need not be contiguous). **Mode and number of proofs:** `longest_common_subsequence_length(+text,+text,-integer)` - `one` ------------------------------------------------------------------------ ###### `longest_common_subsequence/3` Computes the Longest Common Subsequence itself between two strings. **Compilation flags:** `static` **Template:** `longest_common_subsequence(String1,String2,Subsequence)` `String1` - First input string. `String2` - Second input string. `Subsequence` - The longest subsequence common to both strings (characters need not be contiguous). If multiple exist, one is returned nondeterministically. **Mode and number of proofs:** `longest_common_subsequence(+text,+text,-atom)` - `one` ------------------------------------------------------------------------ ###### `longest_common_substring/3` Computes the longest contiguous common substring between two strings. **Compilation flags:** `static` **Template:** `longest_common_substring(String1,String2,Substring)` `String1` - First input string. `String2` - Second input string. `Substring` - The longest contiguous substring shared by both strings. If multiple exist, one is returned nondeterministically. **Mode and number of proofs:** `longest_common_substring(+text,+text,-atom)` - `one` ------------------------------------------------------------------------ ###### `cosine_similarity/3` Computes the cosine similarity between two token lists. **Compilation flags:** `static` **Template:** `cosine_similarity(Tokens1,Tokens2,Similarity)` `Tokens1` - First token list (e.g., list of words or character n-grams). `Tokens2` - Second token list. `Similarity` - A value between 0.0 and 1.0 representing the cosine of the angle between the two token vectors. **Mode and number of proofs:** `cosine_similarity(+list(text),+list(text),-float)` - `one` ------------------------------------------------------------------------ ###### `jaccard_index/3` Computes the Jaccard index (similarity) between two token lists. **Compilation flags:** `static` **Template:** `jaccard_index(Tokens1,Tokens2,Index)` `Tokens1` - First token list (e.g., list of words or character n-grams). `Tokens2` - Second token list. `Index` - A value between 0.0 (no overlap) and 1.0 (identical sets), computed as `|intersection|`` ``/`` ``|union|`. **Mode and number of proofs:** `jaccard_index(+list(text),+list(text),-float)` - `one` ------------------------------------------------------------------------ ###### `soundex/2` Computes the Soundex phonetic encoding for a string. **Compilation flags:** `static` **Template:** `soundex(String,Encoding)` `String` - Input string (typically a name). `Encoding` - A four-character Soundex code representing the phonetic encoding. **Mode and number of proofs:** `soundex(+text,-atom)` - `one` ------------------------------------------------------------------------ ###### `soundex_match/2` Succeeds if two strings share the same Soundex code. **Compilation flags:** `static` **Template:** `soundex_match(String1,String2)` `String1` - First input string. `String2` - Second input string. **Mode and number of proofs:** `soundex_match(+text,+text)` - `one` ------------------------------------------------------------------------ ###### `metaphone/2` Computes the Metaphone phonetic key for a string. **Compilation flags:** `static` **Template:** `metaphone(String,Encoding)` `String` - Input string (typically a name). `Encoding` - The Metaphone phonetic encoding, a more accurate phonetic encoding than Soundex. **Mode and number of proofs:** `metaphone(+text,-atom)` - `one` ------------------------------------------------------------------------ ###### `metaphone_match/2` Succeeds if two strings share the same Metaphone key. **Compilation flags:** `static` **Template:** `metaphone_match(String1,String2)` `String1` - First input string. `String2` - Second input string. **Mode and number of proofs:** `metaphone_match(+text,+text)` - `one` ------------------------------------------------------------------------ ###### `double_metaphone/3` Computes the Double Metaphone encoding of a text, returning both primary and alternative encodings. **Compilation flags:** `static` **Template:** `double_metaphone(Text,Primary,Alternative)` `Text` - Input string (typically a name). `Primary` - Primary Double Metaphone encoding. `Alternative` - Alternative Double Metaphone encoding. **Mode and number of proofs:** `double_metaphone(+text,-atom,-atom)` - `one` ------------------------------------------------------------------------ ###### `double_metaphone_match/2` Succeeds if the Double Metaphone encodings of two texts match (either primary or alternative encodings). **Compilation flags:** `static` **Template:** `double_metaphone_match(String1,String2)` `String1` - First input string. `String2` - Second input string. **Mode and number of proofs:** `double_metaphone_match(+text,+text)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### strings") **object** #### `string(Representation)` - `Representation` - String representation. Valid values are `atom`, `codes`, and `chars`. String manipulation predicates supporting different string representations. **Availability:** `logtalk_load(strings(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-17 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `atom_string/2` - `number_string/2` - `string_chars/2` - `string_codes/2` - `string_concat/3` - `string_length/2` - `sub_string/5` - `string_upper/2` - `string_lower/2` - `split_string/4` - `atomics_to_string/2` - `atomics_to_string/3` - `trim/2` - `trim/3` - `trim_left/2` - `trim_left/3` - `trim_right/2` - `trim_right/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `atom_string/2` Converts between an atom and a string. **Compilation flags:** `static` **Template:** `atom_string(Atom,String)` **Mode and number of proofs:** `atom_string(+atom,?text)` - `zero_or_one` `atom_string(-atom,+text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `number_string/2` Converts between a number and a string. Fails if the string does not represent a valid number. **Compilation flags:** `static` **Template:** `number_string(Number,String)` **Mode and number of proofs:** `number_string(+number,?text)` - `zero_or_one` `number_string(-number,+text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `string_chars/2` Converts between a string and a list of characters. **Compilation flags:** `static` **Template:** `string_chars(String,Chars)` **Mode and number of proofs:** `string_chars(+text,?list(character))` - `zero_or_one` `string_chars(-text,+list(character))` - `zero_or_one` ------------------------------------------------------------------------ ###### `string_codes/2` Converts between a string and a list of character codes. **Compilation flags:** `static` **Template:** `string_codes(String,Codes)` **Mode and number of proofs:** `string_codes(+text,?list(character_code))` - `zero_or_one` `string_codes(-text,+list(character_code))` - `zero_or_one` ------------------------------------------------------------------------ ###### `string_concat/3` Concatenates two strings. **Compilation flags:** `static` **Template:** `string_concat(String1,String2,String3)` **Mode and number of proofs:** `string_concat(+text,+text,?text)` - `zero_or_one` `string_concat(?text,?text,+text)` - `zero_or_more` ------------------------------------------------------------------------ ###### `string_length/2` Returns the length of a string. **Compilation flags:** `static` **Template:** `string_length(String,Length)` **Mode and number of proofs:** `string_length(+text,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sub_string/5` Extracts a substring from a string. **Compilation flags:** `static` **Template:** `sub_string(String,Before,Length,After,SubString)` **Mode and number of proofs:** `sub_string(+text,?integer,?integer,?integer,?text)` - `zero_or_more` ------------------------------------------------------------------------ ###### `string_upper/2` Converts a string to uppercase (ASCII only). **Compilation flags:** `static` **Template:** `string_upper(String,UpperString)` **Mode and number of proofs:** `string_upper(+text,?text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `string_lower/2` Converts a string to lowercase (ASCII only). **Compilation flags:** `static` **Template:** `string_lower(String,LowerString)` **Mode and number of proofs:** `string_lower(+text,?text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `split_string/4` Decomposes `String` into `SubStrings` according to separators `SepChars` and padding characters `PadChars`. The string is split at the separators, and any padding characters around the resulting sub-strings are removed. Characters in both `SepChars` and `PadChars` are treated as separators where sequences count as one separator, and are ignored at string boundaries. **Compilation flags:** `static` **Template:** `split_string(String,SepChars,PadChars,SubStrings)` **Mode and number of proofs:** `split_string(+text,+text,+text,-list(text))` - `one` ------------------------------------------------------------------------ ###### `atomics_to_string/2` Concatenates the atomic terms in `List` into `String`. The list may contain numbers, atoms, and strings (in the current representation). **Compilation flags:** `static` **Template:** `atomics_to_string(List,String)` **Mode and number of proofs:** `atomics_to_string(++list(atomic),-text)` - `one` ------------------------------------------------------------------------ ###### `atomics_to_string/3` Concatenates the atomic terms in `List` into `String`, with `Separator` inserted between each element. The list may contain numbers, atoms, and strings (in the current representation). **Compilation flags:** `static` **Template:** `atomics_to_string(List,Separator,String)` **Mode and number of proofs:** `atomics_to_string(++list(atomic),+text,-text)` - `one` ------------------------------------------------------------------------ ###### `trim/2` Trims string by deleting all leading and trailing whitespace. **Compilation flags:** `static` **Template:** `trim(String,Trimmed)` **Mode and number of proofs:** `trim(+text,-text)` - `one` ------------------------------------------------------------------------ ###### `trim/3` Trims string by deleting all occurrences of the characters in `Elements` from the beginning and end of the string. **Compilation flags:** `static` **Template:** `trim(String,Elements,Trimmed)` **Mode and number of proofs:** `trim(+text,+text,-text)` - `one` ------------------------------------------------------------------------ ###### `trim_left/2` Trims string by deleting all leading whitespace. **Compilation flags:** `static` **Template:** `trim_left(String,Trimmed)` **Mode and number of proofs:** `trim_left(+text,-text)` - `one` ------------------------------------------------------------------------ ###### `trim_left/3` Trims string by deleting all occurrences of the characters in `Elements` from the beginning of the string. **Compilation flags:** `static` **Template:** `trim_left(String,Elements,Trimmed)` **Mode and number of proofs:** `trim_left(+text,+text,-text)` - `one` ------------------------------------------------------------------------ ###### `trim_right/2` Trims string by deleting all trailing whitespace. **Compilation flags:** `static` **Template:** `trim_right(String,Trimmed)` **Mode and number of proofs:** `trim_right(+text,-text)` - `one` ------------------------------------------------------------------------ ###### `trim_right/3` Trims string by deleting all occurrences of the characters in `Elements` from the end of the string. **Compilation flags:** `static` **Template:** `trim_right(String,Elements,Trimmed)` **Mode and number of proofs:** `trim_right(+text,+text,-text)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### subsequences") **object** #### `subsequences` Implementation of subsequence operations over lists. **Availability:** `logtalk_load(subsequences(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` subsequences_protocol **Uses:** fast_random(Algorithm) list **Remarks:** (none) **Inherited public predicates:**  alternating_subsequence/2  alternating_subsequences/2  common_subsequence/3  common_subsequences/3  count_distinct_subsequences/3  count_subsequences/2  init/2  init1/2  init_tail/2  init_tails/2  inits/2  inits1/2  is_prefix_of/2  is_subsequence_of/2  is_suffix_of/2  k_distinct_subsequence/3  k_distinct_subsequences/3  longest_common_increasing_subsequence/3  longest_common_subsequence/3  longest_decreasing_subsequence/2  longest_increasing_subsequence/2  longest_repeating_subsequence/2  nonempty_subsequence/2  nonempty_subsequences/2  power_set/2  proper_subsequence/2  random_subsequence/2  sliding_window/3  subsequence/2  subsequence/3  subsequence_at_indices/3  subsequence_length/2  subsequences/2  subsequences/3  subsequences_with_min_span/3  subslices/2  tail/2  tail1/2  tails/2  tails1/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `subsequences_protocol` Protocol for subsequence operations over lists. **Availability:** `logtalk_load(subsequences(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Generation operations: Predicates for generating all subsequences or variants thereof. > > - Ordering variants: Predicates that support an additional Order argument (default, lexicographic, or shortlex) for controlling output order. > > - Searching and matching: Predicates for finding specific subsequences with desired properties. > > - Prefix and suffix operations: Predicates for checking and finding prefixes and suffixes. > > - Contiguous subsequences: Predicates for working with contiguous subsequences (subslices, sliding windows). > > - Random selection: Predicates for randomly selecting subsequences. > > - Constrained operations: Predicates for generating subsequences with specific constraints. > > - Utility predicates: Helper predicates for subsequence operations. **Inherited public predicates:** (none) - Public predicates - `subsequences/2` - `subsequence/2` - `subsequences/3` - `subsequence/3` - `nonempty_subsequences/2` - `nonempty_subsequence/2` - `power_set/2` - `inits/2` - `init/2` - `tails/2` - `tail/2` - `inits1/2` - `init1/2` - `tails1/2` - `tail1/2` - `init_tails/2` - `init_tail/2` - `longest_common_subsequence/3` - `longest_increasing_subsequence/2` - `longest_decreasing_subsequence/2` - `longest_common_increasing_subsequence/3` - `longest_repeating_subsequence/2` - `is_subsequence_of/2` - `proper_subsequence/2` - `subsequence_at_indices/3` - `common_subsequences/3` - `common_subsequence/3` - `count_distinct_subsequences/3` - `is_prefix_of/2` - `is_suffix_of/2` - `subslices/2` - `sliding_window/3` - `random_subsequence/2` - `subsequences_with_min_span/3` - `alternating_subsequences/2` - `alternating_subsequence/2` - `k_distinct_subsequences/3` - `k_distinct_subsequence/3` - `count_subsequences/2` - `subsequence_length/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `subsequences/2` Generates all subsequences of a list using default order. A subsequence maintains the relative order of elements but need not be contiguous. The empty list is included. **Compilation flags:** `static` **Template:** `subsequences(List,Subsequences)` **Mode and number of proofs:** `subsequences(+list,-list)` - `one` **Examples:** All subsequences `subsequences([a,b,c],Subsequences)` `Subsequences=[[],[a],[b],[a,b],[c],[a,c],[b,c],[a,b,c]]` ------------------------------------------------------------------------ ###### `subsequence/2` True iff the second argument is a subsequence of the first argument. Subsequences of a list using default order. A subsequence maintains the relative order of elements but need not be contiguous. The empty list is included. **Compilation flags:** `static` **Template:** `subsequence(List,Subsequence)` **Mode and number of proofs:** `subsequence(+list,-list)` - `one_or_more` **Examples:** A subsequence `subsequence([1,2],Subsequence)` `Subsequence=[]` ------------------------------------------------------------------------ ###### `subsequences/3` Generates all subsequences of a list with specified ordering: `default` (as naturally produced), `lexicographic`, or `shortlex` (by length first, then lexicographically). **Compilation flags:** `static` **Template:** `subsequences(List,Order,Subsequences)` **Mode and number of proofs:** `subsequences(+list,+atom,-list)` - `one` **Examples:** Shortlex order `subsequences([a,b],shortlex,Subsequences)` `Subsequences=[[],[a],[b],[a,b]]` ------------------------------------------------------------------------ ###### `subsequence/3` True iff the third argument is a subsequence of the first argument with specified ordering: `default` (as naturally produced), `lexicographic`, or `shortlex` (by length first, then lexicographically). **Compilation flags:** `static` **Template:** `subsequence(List,Order,Subsequence)` **Mode and number of proofs:** `subsequence(+list,+atom,-list)` - `one_or_more` **Examples:** Shortlex order `subsequence([a,b],shortlex,Subsequence)` `Subsequence=[]` ------------------------------------------------------------------------ ###### `nonempty_subsequences/2` Generates all non-empty subsequences of a list. **Compilation flags:** `static` **Template:** `nonempty_subsequences(List,Subsequences)` **Mode and number of proofs:** `nonempty_subsequences(+list,-list)` - `one` **Examples:** Non-empty subsequences `nonempty_subsequences([a,b],Subsequences)` `Subsequences=[[a],[b],[a,b]]` ------------------------------------------------------------------------ ###### `nonempty_subsequence/2` True iff the second argument is a non-empty subsequence of the first argument. **Compilation flags:** `static` **Template:** `nonempty_subsequence(List,Subsequence)` **Mode and number of proofs:** `nonempty_subsequence(+list,-list)` - `one_or_more` **Examples:** Non-empty subsequence `nonempty_subsequence([a,b],Subsequence)` `Subsequence=[a]` ------------------------------------------------------------------------ ###### `power_set/2` Generates the power set of a list (all possible subsequences). Alias for subsequences/2 when first argument is ground. **Compilation flags:** `static` **Template:** `power_set(List,PowerSet)` **Mode and number of proofs:** `power_set(+list,-list)` - `one` **Examples:** Power set `power_set([a,b],PowerSet)` `PowerSet=[[],[a],[b],[a,b]]` ------------------------------------------------------------------------ ###### `inits/2` Generates all initial segments (prefixes) of a list, shortest first. Includes the empty list. **Compilation flags:** `static` **Template:** `inits(List,Inits)` **Mode and number of proofs:** `inits(+list,-list)` - `one` **Examples:** All prefixes `inits([a,b,c],Inits)` `Inits=[[],[a],[a,b],[a,b,c]]` ------------------------------------------------------------------------ ###### `init/2` True iff the second argument is one of the initial segments (prefixes) of a list. **Compilation flags:** `static` **Template:** `init(List,Inits)` **Mode and number of proofs:** `init(+list,-term)` - `zero_or_more` `init(+list,+term)` - `zero_or_one` **Examples:** Check prefix `init([a,b,c],[a,b])` `true` ------------------------------------------------------------------------ ###### `tails/2` Generates all final segments (suffixes) of a list, longest first. Includes the empty list. **Compilation flags:** `static` **Template:** `tails(List,Tails)` **Mode and number of proofs:** `tails(+list,-list)` - `one` **Examples:** All suffixes `tails([a,b,c],Tails)` `Tails=[[a,b,c],[b,c],[c],[]]` ------------------------------------------------------------------------ ###### `tail/2` True iff the second argument is one of the final segments (suffixes) of a list. **Compilation flags:** `static` **Template:** `tail(List,Tails)` **Mode and number of proofs:** `tail(+list,-term)` - `zero_or_more` `tail(+list,+term)` - `zero_or_one` **Examples:** Check suffix `tail([a,b,c],[b,c])` `true` ------------------------------------------------------------------------ ###### `inits1/2` Generates all non-empty initial segments (prefixes) of a list, shortest first. **Compilation flags:** `static` **Template:** `inits1(List,Inits)` **Mode and number of proofs:** `inits1(+list,-list)` - `one` **Examples:** Non-empty prefixes `inits1([a,b,c],Inits)` `Inits=[[a],[a,b],[a,b,c]]` ------------------------------------------------------------------------ ###### `init1/2` True iff the second argument is a non-empty initial segment (prefix) of a list, shortest first. **Compilation flags:** `static` **Template:** `init1(List,Init)` **Mode and number of proofs:** `init1(+list,-term)` - `one_or_more` **Examples:** Non-empty prefix `init1([a,b,c],Init)` `Init=[a]` ------------------------------------------------------------------------ ###### `tails1/2` Generates all non-empty final segments (suffixes) of a list, longest first. **Compilation flags:** `static` **Template:** `tails1(List,Tails)` **Mode and number of proofs:** `tails1(+list,-list)` - `one` **Examples:** Non-empty suffix `tails1([a,b,c],Tails)` `Tails=[[a,b,c],[b,c],[c]]` ------------------------------------------------------------------------ ###### `tail1/2` True iff the second argument is a non-empty final segment (suffix) of a list, longest first. **Compilation flags:** `static` **Template:** `tail1(List,Tail)` **Mode and number of proofs:** `tail1(+list,-list)` - `one` **Examples:** Non-empty suffix `tail1([a,b,c],Tail)` `Tail=[a,b,c]` ------------------------------------------------------------------------ ###### `init_tails/2` Generates all pairs of initial and final segments. Each pair Init-Tail represents a split of the list where Init+Tail equals the original list. When the second argument is bound, checks if it is a valid split. **Compilation flags:** `static` **Template:** `init_tails(List,InitTailPairs)` **Mode and number of proofs:** `init_tails(+list,-list)` - `one` **Examples:** All splits `init_tails([a,b],InitTailPairs)` `InitTailPairs=['-'([],[a,b]),'-'([a],[b]),'-'([a,b],[])]` ------------------------------------------------------------------------ ###### `init_tail/2` True iff (Init,Tail) represents a split of the list where Init+Tail equals the original list. **Compilation flags:** `static` **Template:** `init_tail(List,InitTailPairs)` **Mode and number of proofs:** `init_tail(+list,-term)` - `one_or_more` **Examples:** Check split `init_tail([a,b,c],'-'([a],[b,c]))` `true` ------------------------------------------------------------------------ ###### `longest_common_subsequence/3` Finds the longest common subsequence (LCS) between two lists. Uses dynamic programming. **Compilation flags:** `static` **Template:** `longest_common_subsequence(List1,List2,LCS)` **Mode and number of proofs:** `longest_common_subsequence(+list,+list,-list)` - `one` **Examples:** LCS example `longest_common_subsequence([a,b,c,d,e],[a,c,e,f],LCS)` `LCS=[a,c,e]` ------------------------------------------------------------------------ ###### `longest_increasing_subsequence/2` Finds the longest strictly increasing subsequence in a list. Elements must be comparable. **Compilation flags:** `static` **Template:** `longest_increasing_subsequence(List,LIS)` **Mode and number of proofs:** `longest_increasing_subsequence(+list,-list)` - `one` **Examples:** LIS example `longest_increasing_subsequence([3,1,4,1,5,9,2,6],LIS)` `LIS=[1,4,5,9]` ------------------------------------------------------------------------ ###### `longest_decreasing_subsequence/2` Finds the longest strictly decreasing subsequence in a list. Elements must be comparable. **Compilation flags:** `static` **Template:** `longest_decreasing_subsequence(List,LDS)` **Mode and number of proofs:** `longest_decreasing_subsequence(+list,-list)` - `one` **Examples:** LDS example `longest_decreasing_subsequence([9,5,2,8,3,1],LDS)` `LDS=[9,5,2,1]` ------------------------------------------------------------------------ ###### `longest_common_increasing_subsequence/3` Finds the longest subsequence that is both common to two lists and strictly increasing. **Compilation flags:** `static` **Template:** `longest_common_increasing_subsequence(List1,List2,LCIS)` **Mode and number of proofs:** `longest_common_increasing_subsequence(+list,+list,-list)` - `one` **Examples:** LCIS example `longest_common_increasing_subsequence([1,4,2,5],[4,1,3,5],LCIS)` `LCIS=[1,5]` ------------------------------------------------------------------------ ###### `longest_repeating_subsequence/2` Finds the longest subsequence that appears at least twice in the list (at different positions). **Compilation flags:** `static` **Template:** `longest_repeating_subsequence(List,LRS)` **Mode and number of proofs:** `longest_repeating_subsequence(+list,-list)` - `one` **Examples:** LRS example `longest_repeating_subsequence([a,a,b,a,b],LRS)` `LRS=[a,b]` ------------------------------------------------------------------------ ###### `is_subsequence_of/2` Checks if the first list is a subsequence of the second list. All elements must occur in order. **Compilation flags:** `static` **Template:** `is_subsequence_of(Subsequence,List)` **Mode and number of proofs:** `is_subsequence_of(+list,+list)` - `zero_or_one` **Examples:** Valid subsequence `is_subsequence_of([a,c],[a,b,c])` `true` Invalid subsequence `is_subsequence_of([c,a],[a,b,c])` `false` ------------------------------------------------------------------------ ###### `proper_subsequence/2` Checks if the first list is a proper subsequence of the second list (i.e., subsequence and not equal). **Compilation flags:** `static` **Template:** `proper_subsequence(Subsequence,List)` **Mode and number of proofs:** `proper_subsequence(+list,+list)` - `zero_or_one` **Examples:** Proper subsequence `proper_subsequence([a,c],[a,b,c])` `true` Not proper (equal lists) `proper_subsequence([a,b,c],[a,b,c])` `false` ------------------------------------------------------------------------ ###### `subsequence_at_indices/3` Extracts a subsequence using a strictly increasing list of 1-based indices. **Compilation flags:** `static` **Template:** `subsequence_at_indices(List,Indices,Subsequence)` **Mode and number of proofs:** `subsequence_at_indices(+list,+list,-list)` - `zero_or_one` **Examples:** Indices selection `subsequence_at_indices([a,b,c,d],[1,3],Subsequence)` `Subsequence=[a,c]` ------------------------------------------------------------------------ ###### `common_subsequences/3` Generates all subsequences that are common to both lists. **Compilation flags:** `static` **Template:** `common_subsequences(List1,List2,CommonSubsequences)` **Mode and number of proofs:** `common_subsequences(+list,+list,-list)` - `one` **Examples:** All common subsequences `common_subsequences([a,b,c],[a,c,d],CommonSubsequences)` `CommonSubsequences=[[a,c],[a],[c],[]]` ------------------------------------------------------------------------ ###### `common_subsequence/3` True iff the third argument is a common subsequence of both lists. **Compilation flags:** `static` **Template:** `common_subsequence(List1,List2,CommonSubsequence)` **Mode and number of proofs:** `common_subsequence(+list,+list,-list)` - `one_or_more` **Examples:** Check common subsequence `common_subsequence([a,b,c],[a,c,d],[a,c])` `true` ------------------------------------------------------------------------ ###### `count_distinct_subsequences/3` Counts the number of distinct occurrences of a pattern as a subsequence in a list. **Compilation flags:** `static` **Template:** `count_distinct_subsequences(Pattern,List,Count)` **Mode and number of proofs:** `count_distinct_subsequences(+list,+list,-integer)` - `one` **Examples:** Count occurrences `count_distinct_subsequences([a,b],[a,a,b,b],Count)` `Count=4` ------------------------------------------------------------------------ ###### `is_prefix_of/2` Checks if the first list is a prefix of the second list. **Compilation flags:** `static` **Template:** `is_prefix_of(Prefix,List)` **Mode and number of proofs:** `is_prefix_of(+list,+list)` - `zero_or_one` **Examples:** Valid prefix `is_prefix_of([a,b],[a,b,c])` `true` Invalid prefix `is_prefix_of([b,c],[a,b,c])` `false` ------------------------------------------------------------------------ ###### `is_suffix_of/2` Checks if the first list is a suffix of the second list. **Compilation flags:** `static` **Template:** `is_suffix_of(Suffix,List)` **Mode and number of proofs:** `is_suffix_of(+list,+list)` - `zero_or_one` **Examples:** Valid suffix `is_suffix_of([b,c],[a,b,c])` `true` Invalid suffix `is_suffix_of([a,b],[a,b,c])` `false` ------------------------------------------------------------------------ ###### `subslices/2` Generates all contiguous non-empty subslices (sublists) of a list. **Compilation flags:** `static` **Template:** `subslices(List,Subslice)` **Mode and number of proofs:** `subslices(+list,-list)` - `one` `subslices(+list,?list)` - `zero_or_more` **Examples:** All subslices `subslices([a,b,c],Subslice)` `Subslice=[[a],[a,b],[a,b,c],[b],[b,c],[c]]` ------------------------------------------------------------------------ ###### `sliding_window/3` Generates all contiguous windows of size N from a list. Fails if N is larger than the list length. **Compilation flags:** `static` **Template:** `sliding_window(N,List,Window)` **Mode and number of proofs:** `sliding_window(+integer,+list,-list)` - `one` `sliding_window(+integer,+list,?list)` - `zero_or_more` **Examples:** Windows of size 2 `sliding_window(2,[a,b,c,d],Window)` `Window=[[a,b],[b,c],[c,d]]` ------------------------------------------------------------------------ ###### `random_subsequence/2` Randomly selects one subsequence uniformly from all 2^N possible subsequences. **Compilation flags:** `static` **Template:** `random_subsequence(List,Subsequence)` **Mode and number of proofs:** `random_subsequence(+list,-list)` - `one` **Examples:** Random subsequence `random_subsequence([a,b,c],Subsequence)` `Subsequence=[a,c]` ------------------------------------------------------------------------ ###### `subsequences_with_min_span/3` Generates subsequences where consecutive elements are at least MinSpan positions apart in the original list. **Compilation flags:** `static` **Template:** `subsequences_with_min_span(MinSpan,List,Subsequence)` **Mode and number of proofs:** `subsequences_with_min_span(+integer,+list,-list)` - `one` `subsequences_with_min_span(+integer,+list,?list)` - `zero_or_more` **Examples:** Min span of 2 `subsequences_with_min_span(2,[a,b,c,d],Subsequence)` `Subsequence=[a,c]` ------------------------------------------------------------------------ ###### `alternating_subsequences/2` Generates all subsequences that alternate between increasing and decreasing (or vice versa). Elements must be comparable. **Compilation flags:** `static` **Template:** `alternating_subsequences(List,AlternatingSubsequences)` **Mode and number of proofs:** `alternating_subsequences(+list,-list)` - `one` **Examples:** All alternating subsequences `alternating_subsequences([1,3,2,4],AlternatingSubsequences)` `AlternatingSubsequences=[[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]]` ------------------------------------------------------------------------ ###### `alternating_subsequence/2` True iff the second argument is a subsequence that alternates between increasing and decreasing (or vice versa). Elements must be comparable. **Compilation flags:** `static` **Template:** `alternating_subsequence(List,AlternatingSubsequence)` **Mode and number of proofs:** `alternating_subsequence(+list,-list)` - `one_or_more` **Examples:** Alternating `alternating_subsequence([1,3,2,4],AlternatingSubsequence)` `AlternatingSubsequence=[[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]]` ------------------------------------------------------------------------ ###### `k_distinct_subsequences/3` Generates all K-element subsequences where all elements are distinct (no duplicates in the subsequence itself). **Compilation flags:** `static` **Template:** `k_distinct_subsequences(K,List,DistinctSubsequences)` **Mode and number of proofs:** `k_distinct_subsequences(+integer,+list,-list)` - `one` **Examples:** All distinct only `k_distinct_subsequences(2,[a,a,b],DistinctSubsequences)` `DistinctSubsequences=[[a,b],[a,c],[b,c]]` ------------------------------------------------------------------------ ###### `k_distinct_subsequence/3` True iff the third argument is a subsequence of the first argument that is a K-element subsequence where all elements are distinct (no duplicates in the subsequence itself). **Compilation flags:** `static` **Template:** `k_distinct_subsequence(K,List,DistinctSubsequence)` **Mode and number of proofs:** `k_distinct_subsequence(+integer,+list,-list)` - `one` **Examples:** A distinct only `k_distinct_subsequence(2,[a,a,b],DistinctSubsequence)` `DistinctSubsequence=[a,b]` ------------------------------------------------------------------------ ###### `count_subsequences/2` Counts the total number of subsequences (always 2^N for a list of length N). **Compilation flags:** `static` **Template:** `count_subsequences(List,Count)` **Mode and number of proofs:** `count_subsequences(+list,-integer)` - `one` **Examples:** Count `count_subsequences([a,b,c],Count)` `Count=8` ------------------------------------------------------------------------ ###### `subsequence_length/2` Returns the length of a subsequence (same as list length, provided for consistency). **Compilation flags:** `static` **Template:** `subsequence_length(Subsequence,Length)` **Mode and number of proofs:** `subsequence_length(+list,-integer)` - `one` **Examples:** Length `subsequence_length([a,b,c],Length)` `Length=3` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### term_io") **object** #### `term_io` Term input/output from/to atom, chars, and codes. **Availability:** `logtalk_load(term_io(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2023-11-14 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` term_io_protocol **Uses:** os **Remarks:** (none) **Inherited public predicates:**  format_to_atom/3  format_to_chars/3  format_to_chars/4  format_to_codes/3  format_to_codes/4  read_from_atom/2  read_from_chars/2  read_from_codes/2  read_term_from_atom/3  read_term_from_chars/3  read_term_from_chars/4  read_term_from_codes/3  read_term_from_codes/4  with_output_to/2  write_term_to_atom/3  write_term_to_chars/3  write_term_to_chars/4  write_term_to_codes/3  write_term_to_codes/4  write_to_atom/2  write_to_chars/2  write_to_codes/2 - Public predicates - Protected predicates - Private predicates - `temporary_file_/1` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `temporary_file_/1` Logtalk session and `term_io` specific temporary file path. **Compilation flags:** `dynamic` **Template:** `temporary_file_(Path)` **Mode and number of proofs:** `temporary_file_(-atom)` - `one` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `term_io_protocol` Predicates for term input/output from/to atom, chars, and codes. The predicates are declared as synchronized when the library is compiled using a backend supporting threads. **Availability:** `logtalk_load(term_io(loader))` **Author:** Paulo Moura **Version:** 1:3:1 **Date:** 2026-06-15 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Portability notes: To keep calls to these library predicates portable, use only standard read/write options and specify output formats using atoms. **Inherited public predicates:** (none) - Public predicates - `read_term_from_atom/3` - `read_from_atom/2` - `read_term_from_chars/3` - `read_term_from_chars/4` - `read_from_chars/2` - `read_term_from_codes/3` - `read_term_from_codes/4` - `read_from_codes/2` - `write_term_to_atom/3` - `write_to_atom/2` - `write_term_to_chars/3` - `write_term_to_chars/4` - `write_to_chars/2` - `write_term_to_codes/3` - `write_term_to_codes/4` - `write_to_codes/2` - `format_to_atom/3` - `format_to_chars/3` - `format_to_chars/4` - `format_to_codes/3` - `format_to_codes/4` - `with_output_to/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `read_term_from_atom/3` Reads a term from an atom using the given read options. A period at the end of the atom is optional. Valid options are those supported by the standard `read_term/3` predicate. **Compilation flags:** `static,`` ``synchronized` **Template:** `read_term_from_atom(Atom,Term,Options)` **Mode and number of proofs:** `read_term_from_atom(+atom,-term,+list(read_option))` - `one_or_error` **Exceptions:** `Atom` is a variable: `instantiation_error` `Atom` is neither a variable nor an atom: `type_error(atom,Atom)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(read_option,Option)` ------------------------------------------------------------------------ ###### `read_from_atom/2` Reads a term from an atom using default read options. Shorthand for `read_term_from_atom(Atom,Term,[])`. A period at the end of the atom is optional. **Compilation flags:** `static` **Template:** `read_from_atom(Atom,Term)` **Mode and number of proofs:** `read_from_atom(+atom,-term)` - `one_or_error` **Exceptions:** `Atom` is a variable: `instantiation_error` `Atom` is neither a variable nor an atom: `type_error(atom,Atom)` `Atom` text cannot be read as a term: `syntax_error(BackendDependentArgument)` ------------------------------------------------------------------------ ###### `read_term_from_chars/3` Reads a term from a list of characters using the given read options. A period at the end of the list is optional. Valid options are those supported by the standard `read_term/3` predicate. **Compilation flags:** `static,`` ``synchronized` **Template:** `read_term_from_chars(Chars,Term,Options)` **Mode and number of proofs:** `read_term_from_chars(+list(character),-term,+list(read_option))` - `one_or_error` **Exceptions:** `Chars` contains a variable element: `instantiation_error` `Chars` contains an element that is not a character: `type_error(character,Char)` `Chars` text cannot be read as a term: `syntax_error(BackendDependentArgument)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(read_option,Option)` ------------------------------------------------------------------------ ###### `read_term_from_chars/4` Reads a term from a list of characters using the given read options, also returning the remaining characters. A period at the end of the term is required. Valid options are those supported by the standard `read_term/3` predicate. **Compilation flags:** `static` **Template:** `read_term_from_chars(Chars,Term,Tail,Options)` **Mode and number of proofs:** `read_term_from_chars(+list(character),-term,-list(character),+list(read_option))` - `one_or_error` **Exceptions:** `Chars` contains an element that is not a character: `type_error(character,Char)` `Chars` text cannot be read as a term: `syntax_error(BackendDependentArgument)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(read_option,Option)` ------------------------------------------------------------------------ ###### `read_from_chars/2` Reads a term from a list of characters using default read options. Shorthand for `read_term_from_chars(Chars,Term,[])`. A period at the end of the list is optional. **Compilation flags:** `static` **Template:** `read_from_chars(Chars,Term)` **Mode and number of proofs:** `read_from_chars(+list(character),-term)` - `one_or_error` **Exceptions:** `Chars` contains a variable element: `instantiation_error` `Chars` contains an element that is not a character: `type_error(character,Char)` `Chars` text cannot be read as a term: `syntax_error(BackendDependentArgument)` ------------------------------------------------------------------------ ###### `read_term_from_codes/3` Reads a term from a list of character codes using the given read options. A period at the end of the list is optional. Valid options are those supported by the standard `read_term/3` predicate. **Compilation flags:** `static,`` ``synchronized` **Template:** `read_term_from_codes(Codes,Term,Options)` **Mode and number of proofs:** `read_term_from_codes(+list(character_code),-term,+list(read_option))` - `one_or_error` **Exceptions:** `Codes` contains a variable element: `instantiation_error` `Codes` contains an element that is not a character code: `type_error(integer,Code)` `Codes` text cannot be read as a term: `syntax_error(BackendDependentArgument)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(read_option,Option)` ------------------------------------------------------------------------ ###### `read_term_from_codes/4` Reads a term from a list of character codes using the given read options, also returning the remaining character codes. A period at the end of the term is required. Valid options are those supported by the standard `read_term/3` predicate. **Compilation flags:** `static` **Template:** `read_term_from_codes(Codes,Term,Tail,Options)` **Mode and number of proofs:** `read_term_from_codes(+list(character_code),-term,-list(character_code),+list(read_option))` - `one_or_error` **Exceptions:** `Codes` contains an element that is not a character code: `type_error(integer,Code)` `Codes` text cannot be read as a term: `syntax_error(BackendDependentArgument)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(read_option,Option)` ------------------------------------------------------------------------ ###### `read_from_codes/2` Reads a term from a list of character codes using default read options. Shorthand for `read_term_from_codes(Codes,Term,[])`. A period at the end of the list is optional. **Compilation flags:** `static` **Template:** `read_from_codes(Codes,Term)` **Mode and number of proofs:** `read_from_codes(+list(character_code),-term)` - `one_or_error` **Exceptions:** `Codes` contains a variable element: `instantiation_error` `Codes` contains an element that is not a character code: `type_error(integer,Code)` `Codes` text cannot be read as a term: `syntax_error(BackendDependentArgument)` `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(read_option,Option)` ------------------------------------------------------------------------ ###### `write_term_to_atom/3` Writes a term to an atom using the given write options. Valid options are those supported by the standard `write_term/3` predicate. **Compilation flags:** `static,`` ``synchronized` **Template:** `write_term_to_atom(Term,Atom,Options)` **Mode and number of proofs:** `write_term_to_atom(@term,-atom,+list(write_option))` - `one` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(write_option,Option)` ------------------------------------------------------------------------ ###### `write_to_atom/2` Writes a term to an atom using default write options. Shorthand for `write_term_to_atom(Term,Atom,[])`. **Compilation flags:** `static` **Template:** `write_to_atom(Term,Atom)` **Mode and number of proofs:** `write_to_atom(@term,-atom)` - `one` ------------------------------------------------------------------------ ###### `write_term_to_chars/3` Writes a term to a list of characters using the given write options. Shorthand for `write_term_to_chars(Term,Chars,[],Options)`. Valid options are those supported by the standard `write_term/3` predicate. **Compilation flags:** `static` **Template:** `write_term_to_chars(Term,Chars,Options)` **Mode and number of proofs:** `write_term_to_chars(@term,-list(character),+list(write_option))` - `one_or_error` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(write_option,Option)` ------------------------------------------------------------------------ ###### `write_term_to_chars/4` Writes a term to a list of characters with the given tail using the given write options. Valid options are those supported by the standard `write_term/3` predicate. **Compilation flags:** `static,`` ``synchronized` **Template:** `write_term_to_chars(Term,Chars,Tail,Options)` **Mode and number of proofs:** `write_term_to_chars(@term,-list(character),@term,+list(write_option))` - `one_or_error` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(write_option,Option)` ------------------------------------------------------------------------ ###### `write_to_chars/2` Writes a term to a list of characters using default write options. Shorthand for `write_term_to_chars(Term,Chars,[],[])`. **Compilation flags:** `static` **Template:** `write_to_chars(Term,Chars)` **Mode and number of proofs:** `write_to_chars(@term,-list(character))` - `one` ------------------------------------------------------------------------ ###### `write_term_to_codes/3` Writes a term to a list of character codes using the given write options. Shorthand for `write_term_to_codes(Term,Codes,[],Options)`. Valid options are those supported by the standard `write_term/3` predicate. **Compilation flags:** `static` **Template:** `write_term_to_codes(Term,Codes,Options)` **Mode and number of proofs:** `write_term_to_codes(@term,-list(character_code),+list(write_option))` - `one_or_error` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(write_option,Option)` ------------------------------------------------------------------------ ###### `write_term_to_codes/4` Writes a term to a list of character codes with the given tail using the given write options. Valid options are those supported by the standard `write_term/3` predicate. **Compilation flags:** `static,`` ``synchronized` **Template:** `write_term_to_codes(Term,Codes,Tail,Options)` **Mode and number of proofs:** `write_term_to_codes(@term,-list(character_code),@term,+list(write_option))` - `one_or_error` **Exceptions:** `Options` is a variable: `instantiation_error` `Options` is neither a variable nor a list: `type_error(list,Options)` An element `Option` of the list `Options` is a variable: `instantiation_error` An element `Option` of the list `Options` is neither a variable nor a compound term: `type_error(compound,Option)` An element `Option` of the list `Options` is a compound term but not a valid option: `domain_error(write_option,Option)` ------------------------------------------------------------------------ ###### `write_to_codes/2` Writes a term to a list of character codes using default write options. Shorthand for `write_term_to_chars(Term,Codes,[],[])`. **Compilation flags:** `static` **Template:** `write_to_codes(Term,Codes)` **Mode and number of proofs:** `write_to_codes(@term,-list(character_code))` - `one` ------------------------------------------------------------------------ ###### `format_to_atom/3` Writes a list of arguments to an atom using the given format (specified as in the de facto standard `format/2` predicate). **Compilation flags:** `static,`` ``synchronized` **Template:** `format_to_atom(Format,Arguments,Atom)` **Mode and number of proofs:** `format_to_atom(@atom,+list(term),-atom)` - `one` ------------------------------------------------------------------------ ###### `format_to_chars/3` Writes a list of arguments to a list of characters using the given format (specified as in the de facto standard `format/2` predicate). Shorthand for `format_to_chars(Format,Arguments,Chars,[])`. **Compilation flags:** `static` **Template:** `format_to_chars(Format,Arguments,Chars)` **Mode and number of proofs:** `format_to_chars(@term,+list(term),-list(character))` - `one` ------------------------------------------------------------------------ ###### `format_to_chars/4` Writes a term to a list of characters with the given tail using the given format (specified as in the de facto standard `format/2` predicate). **Compilation flags:** `static,`` ``synchronized` **Template:** `format_to_chars(Format,Arguments,Chars,Tail)` **Mode and number of proofs:** `format_to_chars(@term,+list(term),-list(character),@term)` - `one` ------------------------------------------------------------------------ ###### `format_to_codes/3` Writes a list of arguments to a list of character codes using the given format (specified as in the de facto standard `format/2` predicate). Shorthand for `format_to_codes(Format,Arguments,Codes,[])`. **Compilation flags:** `static` **Template:** `format_to_codes(Format,Arguments,Codes)` **Mode and number of proofs:** `format_to_codes(@term,+list(term),-list(character_code))` - `one` ------------------------------------------------------------------------ ###### `format_to_codes/4` Writes a list of arguments to a list of character codes with the given tail using the given format (specified as in the de facto standard `format/2` predicate). **Compilation flags:** `static,`` ``synchronized` **Template:** `format_to_codes(Format,Arguments,Codes,Tail)` **Mode and number of proofs:** `format_to_codes(@term,+list(term),-list(character_code),@term)` - `one` ------------------------------------------------------------------------ ###### `with_output_to/2` Calls a goal deterministically with output to the given format: `atom(Atom)`, `chars(Chars)`, `chars(Chars,Tail)`, `codes(Codes)`, or `codes(Codes,Tail)`. **Compilation flags:** `static,`` ``synchronized` **Template:** `with_output_to(Output,Goal)` **Meta-predicate template:** `with_output_to(*,0)` **Mode and number of proofs:** `with_output_to(+compound,+callable)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### thurstone_mosteller_ranker") **object** #### `thurstone_mosteller_ranker` Thurstone-Mosteller Case V pairwise preference ranker. Learns one real-valued latent utility per item from a dataset object implementing the `pairwise_ranking_dataset_protocol` protocol by fitting continuity-corrected empirical paired-comparison probabilities with a deterministic weighted least-squares normal model, and returns a self-describing ranker term with diagnostics that can be used for ranking and export. **Availability:** `logtalk_load(thurstone_mosteller_ranker(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` ranking_dataset_common `public` score_ranker_model_common **Uses:** avltree list numberlist **Remarks:** (none) **Inherited public predicates:**  check_option/1  check_options/1  check_ranker/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  grouped_dataset_groups/2  grouped_dataset_items/2  grouped_dataset_items/3  grouped_dataset_summary/2  learn/2  learn/3  option/2  option/3  pairwise_dataset_connected_components/2  pairwise_dataset_declared_items/2  pairwise_dataset_items/2  pairwise_dataset_matchups/2  pairwise_dataset_preferences/2  pairwise_dataset_summary/2  pairwise_dataset_win_totals/2  pairwise_measurement_dataset_connected_components/2  pairwise_measurement_dataset_declared_items/2  pairwise_measurement_dataset_items/2  pairwise_measurement_dataset_measurements/2  pairwise_measurement_dataset_summary/2  print_ranker/1  rank/3  ranker_options/2  scores/2  temporal_pairwise_dataset_connected_components/2  temporal_pairwise_dataset_declared_items/2  temporal_pairwise_dataset_games/2  temporal_pairwise_dataset_games/3  temporal_pairwise_dataset_items/2  temporal_pairwise_dataset_periods/2  temporal_pairwise_dataset_summary/2  valid_option/1  valid_options/1  valid_ranker/1  validate_grouped_dataset/1  validate_grouped_dataset/2  validate_pairwise_dataset/1  validate_pairwise_dataset/2  validate_pairwise_measurement_dataset/1  validate_pairwise_measurement_dataset/2  validate_temporal_pairwise_dataset/1  validate_temporal_pairwise_dataset/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pairwise_ranking_dataset_protocol, ranker_protocol, bradley_terry_ranker, regularized_bradley_terry_ranker ### time_scales") **object** #### `time_scales` Time scale conversions for UTC, TAI, TT, UT1, TDB, GPS, GST, TCG, and TCB using bundled and optional override data. **Availability:** `logtalk_load(time_scales(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` time_scales_protocol **Uses:** date time_scales_data **Remarks:** > - Supported UTC range: From 1972-01-01T00:00:00Z onwards. > > - Time representation: Instants are represented as `instant(Scale,Seconds,fraction(Numerator,Denominator))` with normalized fractional part in the `[0,1[` interval. **Inherited public predicates:**  check_conversion/3  check_convert/4  check_instant/1  check_offset/3  clear_dut1_override/0  clear_leap_seconds_override/0  convert/4  dut1_entries/1  dut1_source/1  instant_to_utc_date_time/2  leap_second_date/2  leap_seconds_entries/1  leap_seconds_source/1  load_dut1_override/1  load_leap_seconds_override/1  offset/3  save_dut1_entries/1  save_leap_seconds_entries/1  supported_range/2  utc_date_time_to_instant/2  valid_conversion/3  valid_instant/1  valid_scale/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also time_scales_protocol, date **object** #### `time_scales_data` Bundled and override data plus constants for UTC/TAI/TT/UT1/TDB/TCG/TCB conversions. **Availability:** `logtalk_load(time_scales(loader))` **Author:** Paulo Moura **Version:** 0:2:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** logtalk **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `load_leap_seconds_override/1` - `clear_leap_seconds_override/0` - `leap_seconds_source/1` - `leap_seconds_entries/1` - `save_leap_seconds_entries/1` - `load_dut1_override/1` - `clear_dut1_override/0` - `dut1_source/1` - `dut1_entries/1` - `save_dut1_entries/1` - `leap_offset_at_utc_unix/2` - `leap_effective_date/2` - `tt_minus_tai/2` - `dut1_offset_at_utc_unix/3` - `tdb_minus_tt_approx/3` - `tcg_minus_tt_approx/3` - `tcb_minus_tdb_approx/3` - `tai_minus_utc_for_tai_unix/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `load_leap_seconds_override/1` Loads leap-second override data from a file containing `leap(UnixSeconds,OffsetSeconds).` terms. **Compilation flags:** `static` **Template:** `load_leap_seconds_override(File)` **Mode and number of proofs:** `load_leap_seconds_override(+atom)` - `one` **Remarks:** > - Term format: Each term must be of the form `leap(UnixSeconds,OffsetSeconds).`. > > - Term ordering: Terms must be sorted by increasing `UnixSeconds`. > > - Value constraints: `UnixSeconds` must be an integer greater than or equal to `63072000` and `OffsetSeconds` must be a non-decreasing integer sequence. ------------------------------------------------------------------------ ###### `clear_leap_seconds_override/0` Clears leap-second override data and reverts to bundled data. **Compilation flags:** `static` **Mode and number of proofs:** `clear_leap_seconds_override` - `one` ------------------------------------------------------------------------ ###### `leap_seconds_source/1` Returns the active leap-seconds data source as `bundled` or `override`. **Compilation flags:** `static` **Template:** `leap_seconds_source(Source)` **Mode and number of proofs:** `leap_seconds_source(-atom)` - `one` ------------------------------------------------------------------------ ###### `leap_seconds_entries/1` Returns the active leap-seconds data as an ordered list of `leap(UnixSeconds,OffsetSeconds)` terms. **Compilation flags:** `static` **Template:** `leap_seconds_entries(Entries)` **Mode and number of proofs:** `leap_seconds_entries(-list)` - `one` ------------------------------------------------------------------------ ###### `save_leap_seconds_entries/1` Saves the active leap-seconds data to a file using `leap(UnixSeconds,OffsetSeconds).` terms. **Compilation flags:** `static` **Template:** `save_leap_seconds_entries(File)` **Mode and number of proofs:** `save_leap_seconds_entries(+atom)` - `one` ------------------------------------------------------------------------ ###### `load_dut1_override/1` Loads DUT1 override data from a file containing `dut1(UnixSeconds,Numerator,Denominator).` terms. **Compilation flags:** `static` **Template:** `load_dut1_override(File)` **Mode and number of proofs:** `load_dut1_override(+atom)` - `one` **Remarks:** > - Term format: Each term must be of the form `dut1(UnixSeconds,Numerator,Denominator).`. > > - Term ordering: Terms must be sorted by increasing `UnixSeconds`. > > - Value constraints: `UnixSeconds` and `Numerator` must be integers; `Denominator` must be a positive integer; `UnixSeconds` must be greater than or equal to `63072000`. ------------------------------------------------------------------------ ###### `clear_dut1_override/0` Clears DUT1 override data and reverts to bundled data. **Compilation flags:** `static` **Mode and number of proofs:** `clear_dut1_override` - `one` ------------------------------------------------------------------------ ###### `dut1_source/1` Returns the active DUT1 data source as `bundled` or `override`. **Compilation flags:** `static` **Template:** `dut1_source(Source)` **Mode and number of proofs:** `dut1_source(-atom)` - `one` ------------------------------------------------------------------------ ###### `dut1_entries/1` Returns the active DUT1 data as an ordered list of `dut1(UnixSeconds,Numerator,Denominator)` terms. **Compilation flags:** `static` **Template:** `dut1_entries(Entries)` **Mode and number of proofs:** `dut1_entries(-list)` - `one` ------------------------------------------------------------------------ ###### `save_dut1_entries/1` Saves the active DUT1 data to a file using `dut1(UnixSeconds,Numerator,Denominator).` terms. **Compilation flags:** `static` **Template:** `save_dut1_entries(File)` **Mode and number of proofs:** `save_dut1_entries(+atom)` - `one` ------------------------------------------------------------------------ ###### `leap_offset_at_utc_unix/2` Returns the `TAI-UTC` offset in SI seconds for a given UTC Unix epoch second within the supported range. **Compilation flags:** `static` **Template:** `leap_offset_at_utc_unix(UnixSeconds,OffsetSeconds)` **Mode and number of proofs:** `leap_offset_at_utc_unix(+integer,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `leap_effective_date/2` Enumerates UTC effective dates for `TAI-UTC` offset changes and their resulting offset in SI seconds. **Compilation flags:** `static` **Template:** `leap_effective_date(UTCDateTime,OffsetSeconds)` **Mode and number of proofs:** `leap_effective_date(?compound,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `tt_minus_tai/2` Returns the constant TT minus TAI offset as a rational value `Numerator/Denominator` seconds. **Compilation flags:** `static` **Template:** `tt_minus_tai(Numerator,Denominator)` **Mode and number of proofs:** `tt_minus_tai(-integer,-integer)` - `one` ------------------------------------------------------------------------ ###### `dut1_offset_at_utc_unix/3` Returns DUT1 (`UT1-UTC`) at a UTC Unix epoch second as a rational value `Numerator/Denominator`. **Compilation flags:** `static` **Template:** `dut1_offset_at_utc_unix(UnixSeconds,Numerator,Denominator)` **Mode and number of proofs:** `dut1_offset_at_utc_unix(+integer,-integer,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `tdb_minus_tt_approx/3` Returns an approximate `TDB-TT` offset in seconds for a TT instant represented by integer seconds and normalized fraction. **Compilation flags:** `static` **Template:** `tdb_minus_tt_approx(TTSeconds,Fraction,OffsetSeconds)` **Mode and number of proofs:** `tdb_minus_tt_approx(+integer,+compound,-float)` - `one` ------------------------------------------------------------------------ ###### `tcg_minus_tt_approx/3` Returns an approximate `TCG-TT` offset in seconds for a TT instant represented by integer seconds and normalized fraction. **Compilation flags:** `static` **Template:** `tcg_minus_tt_approx(TTSeconds,Fraction,OffsetSeconds)` **Mode and number of proofs:** `tcg_minus_tt_approx(+integer,+compound,-float)` - `one` ------------------------------------------------------------------------ ###### `tcb_minus_tdb_approx/3` Returns an approximate `TCB-TDB` offset in seconds for a TDB instant represented by integer seconds and normalized fraction. **Compilation flags:** `static` **Template:** `tcb_minus_tdb_approx(TDBSeconds,Fraction,OffsetSeconds)` **Mode and number of proofs:** `tcb_minus_tdb_approx(+integer,+compound,-float)` - `one` ------------------------------------------------------------------------ ###### `tai_minus_utc_for_tai_unix/2` Returns the `TAI-UTC` offset in SI seconds for a given TAI instant represented as Unix-like integer seconds. **Compilation flags:** `static` **Template:** `tai_minus_utc_for_tai_unix(TAISeconds,OffsetSeconds)` **Mode and number of proofs:** `tai_minus_utc_for_tai_unix(+integer,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `time_scales_protocol` Time scales conversion protocol for UTC, TAI, TT, UT1, TDB, GPS, GST, TCG, and TCB. **Availability:** `logtalk_load(time_scales(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-25 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid_scale/1` - `supported_range/2` - `leap_second_date/2` - `load_leap_seconds_override/1` - `clear_leap_seconds_override/0` - `leap_seconds_source/1` - `leap_seconds_entries/1` - `save_leap_seconds_entries/1` - `load_dut1_override/1` - `clear_dut1_override/0` - `dut1_source/1` - `dut1_entries/1` - `save_dut1_entries/1` - `utc_date_time_to_instant/2` - `valid_instant/1` - `check_instant/1` - `valid_conversion/3` - `check_conversion/3` - `instant_to_utc_date_time/2` - `convert/4` - `check_convert/4` - `offset/3` - `check_offset/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valid_scale/1` True when the argument is a supported time scale (`utc`, `tai`, `tt`, `ut1`, `tdb`, `gps`, `gst`, `tcg`, or `tcb`). **Compilation flags:** `static` **Template:** `valid_scale(Scale)` **Mode and number of proofs:** `valid_scale(@atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `supported_range/2` Returns the supported UTC datetime range as `date_time(Year,Month,Day,Hour,Minute,Second)` terms. **Compilation flags:** `static` **Template:** `supported_range(StartUTC,EndUTC)` **Mode and number of proofs:** `supported_range(-compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `leap_second_date/2` Enumerates UTC effective dates for `TAI-UTC` step changes and their resulting offset in SI seconds. **Compilation flags:** `static` **Template:** `leap_second_date(UTCDateTime,OffsetSeconds)` **Mode and number of proofs:** `leap_second_date(?compound,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `load_leap_seconds_override/1` Loads leap-second override data from a user-provided file containing `leap(UnixSeconds,OffsetSeconds).` terms. **Compilation flags:** `static` **Template:** `load_leap_seconds_override(File)` **Mode and number of proofs:** `load_leap_seconds_override(+atom)` - `one` ------------------------------------------------------------------------ ###### `clear_leap_seconds_override/0` Clears any previously loaded leap-second override data and reverts to bundled data. **Compilation flags:** `static` **Mode and number of proofs:** `clear_leap_seconds_override` - `one` ------------------------------------------------------------------------ ###### `leap_seconds_source/1` Returns the active leap-seconds data source as either `bundled` or `override`. **Compilation flags:** `static` **Template:** `leap_seconds_source(Source)` **Mode and number of proofs:** `leap_seconds_source(-atom)` - `one` ------------------------------------------------------------------------ ###### `leap_seconds_entries/1` Returns the active leap-seconds table as an ordered list of `leap(UnixSeconds,OffsetSeconds)` terms. **Compilation flags:** `static` **Template:** `leap_seconds_entries(Entries)` **Mode and number of proofs:** `leap_seconds_entries(-list)` - `one` ------------------------------------------------------------------------ ###### `save_leap_seconds_entries/1` Saves the active leap-seconds table to a file as `leap(UnixSeconds,OffsetSeconds).` terms. **Compilation flags:** `static` **Template:** `save_leap_seconds_entries(File)` **Mode and number of proofs:** `save_leap_seconds_entries(+atom)` - `one` ------------------------------------------------------------------------ ###### `load_dut1_override/1` Loads DUT1 override data from a user-provided file containing `dut1(UnixSeconds,Numerator,Denominator).` terms. **Compilation flags:** `static` **Template:** `load_dut1_override(File)` **Mode and number of proofs:** `load_dut1_override(+atom)` - `one` ------------------------------------------------------------------------ ###### `clear_dut1_override/0` Clears any previously loaded DUT1 override data and reverts to bundled data. **Compilation flags:** `static` **Mode and number of proofs:** `clear_dut1_override` - `one` ------------------------------------------------------------------------ ###### `dut1_source/1` Returns the active DUT1 data source as either `bundled` or `override`. **Compilation flags:** `static` **Template:** `dut1_source(Source)` **Mode and number of proofs:** `dut1_source(-atom)` - `one` ------------------------------------------------------------------------ ###### `dut1_entries/1` Returns the active DUT1 table as an ordered list of `dut1(UnixSeconds,Numerator,Denominator)` terms. **Compilation flags:** `static` **Template:** `dut1_entries(Entries)` **Mode and number of proofs:** `dut1_entries(-list)` - `one` ------------------------------------------------------------------------ ###### `save_dut1_entries/1` Saves the active DUT1 table to a file as `dut1(UnixSeconds,Numerator,Denominator).` terms. **Compilation flags:** `static` **Template:** `save_dut1_entries(File)` **Mode and number of proofs:** `save_dut1_entries(+atom)` - `one` ------------------------------------------------------------------------ ###### `utc_date_time_to_instant/2` Converts a UTC datetime term to an instant represented as `instant(utc,Seconds,fraction(Numerator,Denominator))` where `Seconds` are Unix epoch seconds and the fractional component is normalized. **Compilation flags:** `static` **Template:** `utc_date_time_to_instant(UTCDateTime,Instant)` **Mode and number of proofs:** `utc_date_time_to_instant(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `valid_instant/1` True when the argument is a valid supported instant term `instant(Scale,Seconds,fraction(Numerator,Denominator))`. **Compilation flags:** `static` **Template:** `valid_instant(Instant)` **Mode and number of proofs:** `valid_instant(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `check_instant/1` Checks an instant term and throws an error instead of failing on invalid input. **Compilation flags:** `static` **Template:** `check_instant(Instant)` **Mode and number of proofs:** `check_instant(+compound)` - `one_or_error` **Exceptions:** `Instant` is a variable: `instantiation_error` `Instant` is not a valid instant term: `domain_error(instant,Instant)` `Scale` in `Instant` is neither a variable nor an atom: `type_error(atom,Scale)` `Scale` in `Instant` is not supported: `domain_error(time_scale,Scale)` `Seconds` in `Instant` is neither a variable nor an integer: `type_error(integer,Seconds)` `Seconds` in `Instant` is before supported UTC epoch: `domain_error(utc_unix_seconds,Seconds)` Fraction term in `Instant` is not of the form `fraction(Numerator,Denominator)`: `domain_error(fraction,Fraction)` `Numerator` in `Instant` is neither a variable nor an integer: `type_error(integer,Numerator)` `Denominator` in `Instant` is neither a variable nor an integer: `type_error(integer,Denominator)` `Denominator` in `Instant` is not positive: `domain_error(positive_denominator,Denominator)` Normalized fraction in `Instant` is not in the `[0,1[` interval: `domain_error(normalized_fraction,Fraction)` ------------------------------------------------------------------------ ###### `valid_conversion/3` True when an instant is valid for `FromScale` and conversion to `ToScale` is admissible. **Compilation flags:** `static` **Template:** `valid_conversion(Instant,FromScale,ToScale)` **Mode and number of proofs:** `valid_conversion(+compound,+atom,+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `check_conversion/3` Checks a conversion request and throws an error instead of failing on invalid input. **Compilation flags:** `static` **Template:** `check_conversion(Instant,FromScale,ToScale)` **Mode and number of proofs:** `check_conversion(+compound,+atom,+atom)` - `one_or_error` **Exceptions:** `Instant`, `FromScale`, or `ToScale` is a variable: `instantiation_error` `FromScale` is neither a variable nor an atom: `type_error(atom,FromScale)` `ToScale` is neither a variable nor an atom: `type_error(atom,ToScale)` `FromScale` is not supported: `domain_error(time_scale,FromScale)` `ToScale` is not supported: `domain_error(time_scale,ToScale)` `Instant` is not a valid instant term: `domain_error(instant,Instant)` `Scale` in `Instant` is neither a variable nor an atom: `type_error(atom,Scale)` `Scale` in `Instant` is not supported: `domain_error(time_scale,Scale)` `Seconds` in `Instant` is neither a variable nor an integer: `type_error(integer,Seconds)` `Seconds` in `Instant` is before supported UTC epoch: `domain_error(utc_unix_seconds,Seconds)` Fraction term in `Instant` is not of the form `fraction(Numerator,Denominator)`: `domain_error(fraction,Fraction)` `Numerator` in `Instant` is neither a variable nor an integer: `type_error(integer,Numerator)` `Denominator` in `Instant` is neither a variable nor an integer: `type_error(integer,Denominator)` `Denominator` in `Instant` is not positive: `domain_error(positive_denominator,Denominator)` Normalized fraction in `Instant` is not in the `[0,1[` interval: `domain_error(normalized_fraction,Fraction)` `Instant` scale does not match `FromScale`: `domain_error(scale_mismatch,instant_scale(InstantScale,FromScale))` ------------------------------------------------------------------------ ###### `instant_to_utc_date_time/2` Converts an UTC instant represented as `instant(utc,Seconds,fraction(Numerator,Denominator))` to a UTC datetime term. Requires zero fractional part. **Compilation flags:** `static` **Template:** `instant_to_utc_date_time(Instant,UTCDateTime)` **Mode and number of proofs:** `instant_to_utc_date_time(+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `convert/4` Converts an `instant(Scale,Seconds,fraction(Numerator,Denominator))` from `FromScale` to `ToScale`. **Compilation flags:** `static` **Template:** `convert(Instant,FromScale,ToScale,ConvertedInstant)` **Mode and number of proofs:** `convert(+compound,+atom,+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `check_convert/4` Converts an instant from `FromScale` to `ToScale` and throws an error instead of failing on invalid input. **Compilation flags:** `static` **Template:** `check_convert(Instant,FromScale,ToScale,ConvertedInstant)` **Mode and number of proofs:** `check_convert(+compound,+atom,+atom,-compound)` - `one_or_error` **Exceptions:** `Instant`, `FromScale`, or `ToScale` is a variable: `instantiation_error` `FromScale` is neither a variable nor an atom: `type_error(atom,FromScale)` `ToScale` is neither a variable nor an atom: `type_error(atom,ToScale)` `FromScale` is not supported: `domain_error(time_scale,FromScale)` `ToScale` is not supported: `domain_error(time_scale,ToScale)` `Instant` is not a valid instant term: `domain_error(instant,Instant)` `Scale` in `Instant` is neither a variable nor an atom: `type_error(atom,Scale)` `Scale` in `Instant` is not supported: `domain_error(time_scale,Scale)` `Seconds` in `Instant` is neither a variable nor an integer: `type_error(integer,Seconds)` `Seconds` in `Instant` is before supported UTC epoch: `domain_error(utc_unix_seconds,Seconds)` Fraction term in `Instant` is not of the form `fraction(Numerator,Denominator)`: `domain_error(fraction,Fraction)` `Numerator` in `Instant` is neither a variable nor an integer: `type_error(integer,Numerator)` `Denominator` in `Instant` is neither a variable nor an integer: `type_error(integer,Denominator)` `Denominator` in `Instant` is not positive: `domain_error(positive_denominator,Denominator)` Normalized fraction in `Instant` is not in the `[0,1[` interval: `domain_error(normalized_fraction,Fraction)` `Instant` scale does not match `FromScale`: `domain_error(scale_mismatch,instant_scale(InstantScale,FromScale))` ------------------------------------------------------------------------ ###### `offset/3` Returns the offset required to convert an instant to a target scale as `rational(Numerator,Denominator)`. **Compilation flags:** `static` **Template:** `offset(Instant,ToScale,Offset)` **Mode and number of proofs:** `offset(+compound,+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `check_offset/3` Returns the conversion offset and throws an error instead of failing on invalid input. **Compilation flags:** `static` **Template:** `check_offset(Instant,ToScale,Offset)` **Mode and number of proofs:** `check_offset(+compound,+atom,-compound)` - `one_or_error` **Exceptions:** `Instant` or `ToScale` is a variable: `instantiation_error` `ToScale` is neither a variable nor an atom: `type_error(atom,ToScale)` `ToScale` is not supported: `domain_error(time_scale,ToScale)` `Instant` is not a valid instant term: `domain_error(instant,Instant)` `Scale` in `Instant` is neither a variable nor an atom: `type_error(atom,Scale)` `Scale` in `Instant` is not supported: `domain_error(time_scale,Scale)` `Seconds` in `Instant` is neither a variable nor an integer: `type_error(integer,Seconds)` `Seconds` in `Instant` is before supported UTC epoch: `domain_error(utc_unix_seconds,Seconds)` Fraction term in `Instant` is not of the form `fraction(Numerator,Denominator)`: `domain_error(fraction,Fraction)` `Numerator` in `Instant` is neither a variable nor an integer: `type_error(integer,Numerator)` `Denominator` in `Instant` is neither a variable nor an integer: `type_error(integer,Denominator)` `Denominator` in `Instant` is not positive: `domain_error(positive_denominator,Denominator)` Normalized fraction in `Instant` is not in the `[0,1[` interval: `domain_error(normalized_fraction,Fraction)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also time_scales, date ### timeout") **object** #### `timeout` Predicates for calling goal with a time limit. **Availability:** `logtalk_load(timeout(loader))` **Author:** Paulo Moura **Version:** 0:10:0 **Date:** 2022-06-15 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Supported backend Prolog systems: B-Prolog, ECLiPSe, SICStus Prolog, SWI-Prolog, Trealla Prolog, XSB, XVM, and YAP. **Inherited public predicates:** (none) - Public predicates - `call_with_timeout/2` - `call_with_timeout/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `call_with_timeout/2` Calls a goal deterministically with the given time limit (expressed in seconds). Note that the goal may fail or throw an error before exhausting the time limit. **Compilation flags:** `static` **Template:** `call_with_timeout(Goal,Timeout)` **Meta-predicate template:** `call_with_timeout(0,*)` **Mode and number of proofs:** `call_with_timeout(+callable,+positive_number)` - `zero_or_one` **Exceptions:** Goal does not complete in the allowed time: `timeout(Goal)` ------------------------------------------------------------------------ ###### `call_with_timeout/3` Calls a goal deterministically with the given time limit (expressed in seconds) returning a reified result: `true`, `fail`, `timeout`, or `error(Error)`. **Compilation flags:** `static` **Template:** `call_with_timeout(Goal,Timeout,Result)` **Meta-predicate template:** `call_with_timeout(0,*,*)` **Mode and number of proofs:** `call_with_timeout(+callable,+positive_number,--atom)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### tle_orbits") **object** #### `tle_orbits` Parser for Two-Line Element sets with an approximate portable propagator featuring automatic branching between near-earth and deep-space variants, a legacy two-body fallback model, and ground-track sampling. **Availability:** `logtalk_load(tle_orbits(loader))` **Author:** Paulo Moura **Version:** 1:2:0 **Date:** 2026-07-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` tle_orbits_protocol **Uses:** crs_projections date iso8601 list reader time **Remarks:** (none) **Inherited public predicates:**  ground_track/5  ground_track/6  parse/2  parse_lines/4  propagate/3  propagate/4  propagate/5  propagate_state/4  propagate_state/5 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `tle_orbits_protocol` Protocol for parsing Two-Line Element sets and performing approximate portable orbit propagation with near-earth and deep-space variants plus ground-track sampling. **Availability:** `logtalk_load(tle_orbits(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `parse_lines/4` - `propagate/3` - `propagate/4` - `propagate/5` - `propagate_state/4` - `propagate_state/5` - `ground_track/5` - `ground_track/6` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses one or more TLE records from a source specification into canonical `tle(...)` terms. Supported source specifications are `atom(Atom)`, `chars(List)`, `codes(List)`, `stream(Stream)`, and `file(Path)`. **Compilation flags:** `static` **Template:** `parse(Source,TLEs)` **Mode and number of proofs:** `parse(++compound,--list(compound))` - `one_or_error` **Exceptions:** `Source` is a variable or contains a variable source argument: `instantiation_error` `Source` is neither a variable nor a valid source specification: `domain_error(tle_source,Source)` The parsed non-blank lines cannot be grouped into valid TLE records: `domain_error(tle_records,Lines)` ------------------------------------------------------------------------ ###### `parse_lines/4` Parses a single TLE record given an optional name atom or the atom `none` plus the two raw TLE lines. **Compilation flags:** `static` **Template:** `parse_lines(Name,Line1,Line2,TLE)` **Mode and number of proofs:** `parse_lines(++nonvar,++atom,++atom,--compound)` - `one_or_error` **Exceptions:** `Name` is a variable: `instantiation_error` `Name` is neither the atom `none` nor an atom name: `domain_error(tle_name,Name)` `Line1` is a variable: `instantiation_error` `Line1` is neither a variable nor an atom: `domain_error(tle_line,Line1)` `Line2` is a variable: `instantiation_error` `Line2` is neither a variable nor an atom: `domain_error(tle_line,Line2)` The given name and lines do not form a valid TLE record because of invalid syntax, checksum, field encoding, or orbital element ranges: `domain_error(tle_lines,[Name,Line1,Line2])` ------------------------------------------------------------------------ ###### `propagate/3` Propagates a parsed TLE using the default `approximate` model and returns a `geographic(Latitude,Longitude,Height)` coordinate. Supported time specifications are `date_time(Year,Month,Day,Hours,Minutes,Seconds)`, `julian_date(JulianDate)`, and `offset_seconds(SecondsSinceEpoch)`. **Compilation flags:** `static` **Template:** `propagate(TLE,Time,Coordinate)` **Mode and number of proofs:** `propagate(++compound,++nonvar,--compound)` - `one_or_error` **Exceptions:** `Time` is not one of the supported time specifications with the required numeric components: `domain_error(tle_time,Time)` ------------------------------------------------------------------------ ###### `propagate/4` Propagates a parsed TLE using the default `approximate` model and returns coordinates in the requested frame. Supported frames are `eci` returning `eci(X,Y,Z)`, `ecef` returning `ecef(X,Y,Z)`, and `wgs84_3d` returning `geographic(Latitude,Longitude,Height)`. **Compilation flags:** `static` **Template:** `propagate(TLE,Time,Frame,Coordinate)` **Mode and number of proofs:** `propagate(++compound,++nonvar,++atom,--compound)` - `one_or_error` **Exceptions:** `Frame` is not one of the supported reference frame identifiers: `domain_error(tle_reference_frame,Frame)` `Time` is not one of the supported time specifications with the required numeric components: `domain_error(tle_time,Time)` ------------------------------------------------------------------------ ###### `propagate/5` Propagates a parsed TLE using the requested propagation model and returns coordinates in the requested frame. Supported models are `approximate` for automatic near-earth versus deep-space dispatch, `approximate_near_earth` for the low-period approximate branch with J2 secular and short-period corrections plus low-order B\* drag handling, `approximate_deep_space` for the dedicated deep-space approximate branch with resonance-aware long-period corrections, and `two_body` for the legacy Keplerian approximation. **Compilation flags:** `static` **Template:** `propagate(TLE,Time,Frame,Model,Coordinate)` **Mode and number of proofs:** `propagate(++compound,++nonvar,++atom,++atom,--compound)` - `one_or_error` **Exceptions:** `Frame` is not one of the supported reference frame identifiers: `domain_error(tle_reference_frame,Frame)` `Model` is not one of the supported propagation model identifiers: `domain_error(tle_propagation_model,Model)` `Time` is not one of the supported time specifications with the required numeric components: `domain_error(tle_time,Time)` ------------------------------------------------------------------------ ###### `propagate_state/4` Propagates a parsed TLE using the default `approximate` model and returns `state(Position,Velocity)` in the requested frame. Velocity is derived directly from the propagated orbital elements in ECI and analytically transformed to the requested frame. Supported frames are `eci` returning `state(eci(X,Y,Z),`` ``eci(VX,VY,VZ))`, `ecef` returning `state(ecef(X,Y,Z),`` ``ecef(VX,VY,VZ))`, and `wgs84_3d` returning `state(geographic(Latitude,Longitude,Height),`` ``enu(East,North,Up))`. **Compilation flags:** `static` **Template:** `propagate_state(TLE,Time,Frame,State)` **Mode and number of proofs:** `propagate_state(++compound,++nonvar,++atom,--compound)` - `one_or_error` **Exceptions:** `Frame` is not one of the supported reference frame identifiers: `domain_error(tle_reference_frame,Frame)` `Time` is not one of the supported time specifications with the required numeric components: `domain_error(tle_time,Time)` ------------------------------------------------------------------------ ###### `propagate_state/5` Propagates a parsed TLE using the requested propagation model and returns `state(Position,Velocity)` in the requested frame. Velocity is derived directly from the propagated orbital elements in ECI and analytically transformed to the requested frame. Supported models are `approximate`, `approximate_near_earth`, `approximate_deep_space`, and `two_body`. **Compilation flags:** `static` **Template:** `propagate_state(TLE,Time,Frame,Model,State)` **Mode and number of proofs:** `propagate_state(++compound,++nonvar,++atom,++atom,--compound)` - `one_or_error` **Exceptions:** `Frame` is not one of the supported reference frame identifiers: `domain_error(tle_reference_frame,Frame)` `Model` is not one of the supported propagation model identifiers: `domain_error(tle_propagation_model,Model)` `Time` is not one of the supported time specifications with the required numeric components: `domain_error(tle_time,Time)` ------------------------------------------------------------------------ ###### `ground_track/5` Samples the propagated sub-satellite ground track between two UTC `date_time/6` instants separated by a positive step size in seconds using the default `approximate` model, returning `sample(DateTime,`` ``geographic(Latitude,Longitude,Height))` terms. **Compilation flags:** `static` **Template:** `ground_track(TLE,StartDateTime,EndDateTime,StepSeconds,Samples)` **Mode and number of proofs:** `ground_track(++compound,++compound,++compound,++number,--list(compound))` - `one_or_error` **Exceptions:** `StartDateTime`, `EndDateTime`, or `StepSeconds` do not define a valid ground-track sampling interval for the default model: `domain_error(tle_ground_track,[StartDateTime,EndDateTime,StepSeconds,approximate])` ------------------------------------------------------------------------ ###### `ground_track/6` Samples the propagated sub-satellite ground track between two UTC `date_time/6` instants separated by a positive step size in seconds using the requested propagation model. Supported models are `approximate`, `approximate_near_earth`, `approximate_deep_space`, and `two_body`. **Compilation flags:** `static` **Template:** `ground_track(TLE,StartDateTime,EndDateTime,StepSeconds,Model,Samples)` **Mode and number of proofs:** `ground_track(++compound,++compound,++compound,++number,++atom,--list(compound))` - `one_or_error` **Exceptions:** `Model` is not one of the supported propagation model identifiers: `domain_error(tle_propagation_model,Model)` `StartDateTime`, `EndDateTime`, or `StepSeconds` do not define a valid ground-track sampling interval for the requested model: `domain_error(tle_ground_track,[StartDateTime,EndDateTime,StepSeconds,Model])` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also tle_orbits, crs_projections_protocol ### toml") **object** #### `toml` TOML parser and generator. Uses compound terms for parsed TOML tables, dashes for parsed TOML pairs, and atoms for parsed TOML string values. **Availability:** `logtalk_load(toml(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-09 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` toml(compound,dash,atom) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `toml(StringRepresentation)` - `StringRepresentation` - Text representation to be used when decoding TOML string values. Possible values are `atom` (default), `chars`, and `codes`. TOML parser and generator. Uses compound terms for parsed TOML tables and dashes for parsed TOML pairs. **Availability:** `logtalk_load(toml(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-09 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` toml(compound,dash,StringRepresentation) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `toml(ObjectRepresentation,PairRepresentation,StringRepresentation)` - `ObjectRepresentation` - Object representation to be used when decoding TOML tables. Possible values are `compound` (default) and `curly`. - `PairRepresentation` - Pair representation to be used when decoding TOML tables. Possible values are `dash` (default), `equal`, and `colon`. - `StringRepresentation` - Text representation to be used when decoding TOML basic and literal string values. Possible values are `atom` (default), `chars`, and `codes`. TOML parser and generator. **Availability:** `logtalk_load(toml(loader))` **Author:** Paulo Moura **Version:** 1:1:2 **Date:** 2026-05-18 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` toml_protocol **Uses:** list reader **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `toml_protocol` TOML parser and generator protocol. **Availability:** `logtalk_load(toml(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-09 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses TOML content read from the given source (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a ground term representing the parsed TOML document. **Compilation flags:** `static` **Template:** `parse(Source,TOML)` **Mode and number of proofs:** `parse(++compound,--ground)` - `zero_or_one` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(toml_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates TOML output using the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) from the ground TOML term in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,TOML)` **Mode and number of proofs:** `generate(++compound,+ground)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `TOML` is a variable: `instantiation_error` `TOML` is not a valid TOML term: `domain_error(toml_term,TOML)` `Sink` cannot be generated: `domain_error(toml_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### tool_diagnostics") **category** #### `tool_diagnostics_common` Default definitions for diagnostics targets, rule enumeration, and summary/breakdown helpers. **Availability:** `logtalk_load(tool_diagnostics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-01 **Compilation flags:** `static` **Implements:** `public` tool_diagnostics_protocol **Uses:** list **Remarks:** (none) **Inherited public predicates:**  diagnostic/2  diagnostic/3  diagnostic_rule/5  diagnostic_rules/1  diagnostic_target/1  diagnostics/2  diagnostics/3  diagnostics_preflight/2  diagnostics_preflight/3  diagnostics_summary/2  diagnostics_summary/3  diagnostics_tool/5 - Public predicates - Protected predicates - `context_summaries/2` - `diagnostics_breakdown/2` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `context_summaries/2` Returns a list of context summary terms for a list of diagnostics. **Compilation flags:** `static` **Template:** `context_summaries(Diagnostics,ContextSummaries)` **Mode and number of proofs:** `context_summaries(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostics_breakdown/2` Returns a breakdown term with rule, severity, and confidence counts for a list of diagnostics. **Compilation flags:** `static` **Template:** `diagnostics_breakdown(Diagnostics,Breakdown)` **Mode and number of proofs:** `diagnostics_breakdown(+list(compound),-compound)` - `one` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `tool_diagnostics_protocol` Common machine-readable diagnostics protocol for developer tools. **Availability:** `logtalk_load(tool_diagnostics(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-03-31 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Targets and options: Implementing objects should enumerate supported targets using `diagnostic_target/1` and predicates taking an `Options` argument must accept `explanations(Boolean)`. > > - Tool metadata predicate: Tool metadata is exposed using `diagnostics_tool/5`. > > - Rule descriptor predicate: Rule descriptors are exposed using `diagnostic_rule/5` and collected in stable order using `diagnostic_rules/1`. > > - Diagnostic and preflight terms: Findings and analysis prerequisites are represented using `diagnostic/8` and `preflight_issue/7` terms. > > - Summary term: Summaries are represented using `diagnostics_summary/5` terms with supporting breakdown and count terms. **Inherited public predicates:** (none) - Public predicates - `diagnostics_tool/5` - `diagnostic_target/1` - `diagnostic_rule/5` - `diagnostic_rules/1` - `diagnostic/3` - `diagnostic/2` - `diagnostics/3` - `diagnostics/2` - `diagnostics_summary/3` - `diagnostics_summary/2` - `diagnostics_preflight/3` - `diagnostics_preflight/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `diagnostics_tool/5` Returns tool metadata. **Compilation flags:** `static` **Template:** `diagnostics_tool(Id,Name,Version,InformationURI,Properties)` **Mode and number of proofs:** `diagnostics_tool(?atom,?atom,?atom,?atom,?list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `diagnostic_target/1` Enumerates supported diagnostics target patterns. **Compilation flags:** `static` **Template:** `diagnostic_target(Target)` **Mode and number of proofs:** `diagnostic_target(?nonvar)` - `zero_or_more` ------------------------------------------------------------------------ ###### `diagnostic_rule/5` Enumerates diagnostic rule descriptors. **Compilation flags:** `static` **Template:** `diagnostic_rule(RuleId,ShortDescription,FullDescription,DefaultSeverity,Properties)` **Mode and number of proofs:** `diagnostic_rule(?atom,?atom,?atom,?atom,?list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `diagnostic_rules/1` Returns all supported diagnostic rule descriptors in a stable order. **Compilation flags:** `static` **Template:** `diagnostic_rules(Rules)` **Mode and number of proofs:** `diagnostic_rules(-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostic/3` Enumerates, by backtracking, diagnostics for a target using the given options. Diagnostics are returned using terms of the form `diagnostic(RuleId,`` ``Severity,`` ``Confidence,`` ``Message,`` ``Context,`` ``File,`` ``Lines,`` ``Properties)`. All implementations must accept the common option `explanations(Boolean)`. **Compilation flags:** `static` **Template:** `diagnostic(Target,Diagnostic,Options)` **Mode and number of proofs:** `diagnostic(+nonvar,-compound,+list(compound))` - `zero_or_more` ------------------------------------------------------------------------ ###### `diagnostic/2` Enumerates, by backtracking, diagnostics for a target using default options. Diagnostics are returned using terms of the form `diagnostic(RuleId,`` ``Severity,`` ``Confidence,`` ``Message,`` ``Context,`` ``File,`` ``Lines,`` ``Properties)`. **Compilation flags:** `static` **Template:** `diagnostic(Target,Diagnostic)` **Mode and number of proofs:** `diagnostic(+nonvar,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `diagnostics/3` Returns an ordered set of diagnostics for a target using the given options. Diagnostics are returned using terms of the form `diagnostic(RuleId,`` ``Severity,`` ``Confidence,`` ``Message,`` ``Context,`` ``File,`` ``Lines,`` ``Properties)`. All implementations must accept the common option `explanations(Boolean)`. **Compilation flags:** `static` **Template:** `diagnostics(Target,Diagnostics,Options)` **Mode and number of proofs:** `diagnostics(+nonvar,-list(compound),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostics/2` Returns an ordered set of diagnostics for a target using default options. Diagnostics are returned using terms of the form `diagnostic(RuleId,`` ``Severity,`` ``Confidence,`` ``Message,`` ``Context,`` ``File,`` ``Lines,`` ``Properties)`. **Compilation flags:** `static` **Template:** `diagnostics(Target,Diagnostics)` **Mode and number of proofs:** `diagnostics(+nonvar,-list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostics_summary/3` Returns a machine-readable summary for a target using the given options. The summary counts diagnostics only and does not include preflight issues. All implementations must accept the common option `explanations(Boolean)`. **Compilation flags:** `static` **Template:** `diagnostics_summary(Target,Summary,Options)` **Mode and number of proofs:** `diagnostics_summary(+nonvar,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostics_summary/2` Returns a machine-readable summary for a target using default options. The summary counts diagnostics only and does not include preflight issues. **Compilation flags:** `static` **Template:** `diagnostics_summary(Target,Summary)` **Mode and number of proofs:** `diagnostics_summary(+nonvar,-compound)` - `one` ------------------------------------------------------------------------ ###### `diagnostics_preflight/3` Returns an ordered set of machine-readable preflight issues for a target using the given options. Preflight issues are returned using terms of the form `preflight_issue(Id,`` ``Severity,`` ``Message,`` ``Context,`` ``File,`` ``Lines,`` ``Properties)`. All implementations must accept the common option `explanations(Boolean)`. **Compilation flags:** `static` **Template:** `diagnostics_preflight(Target,Issues,Options)` **Mode and number of proofs:** `diagnostics_preflight(+nonvar,-list(compound),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `diagnostics_preflight/2` Returns an ordered set of machine-readable preflight issues for a target using default options. Preflight issues are returned using terms of the form `preflight_issue(Id,`` ``Severity,`` ``Message,`` ``Context,`` ``File,`` ``Lines,`` ``Properties)`. **Compilation flags:** `static` **Template:** `diagnostics_preflight(Target,Issues)` **Mode and number of proofs:** `diagnostics_preflight(+nonvar,-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### toon") **object** #### `toon` TOON parser and generator. Uses curly terms for parsed TOON objects, dashes for parsed TOON pairs, and atoms for parsed TOON strings. **Availability:** `logtalk_load(toon(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2025-12-07 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` toon(curly,dash,atom) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `toon(StringRepresentation)` - `StringRepresentation` - Text representation to be used when decoding TOON strings. Possible values are `atom` (default), `chars`, and `codes`. TOON parser and generator. Uses curly terms for parsed TOON objects and dashes for parsed TOON pairs. **Availability:** `logtalk_load(toon(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2025-12-07 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` toon(curly,dash,StringRepresentation) **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `toon(ObjectRepresentation,PairRepresentation,StringRepresentation)` - `ObjectRepresentation` - Object representation to be used when decoding TOON objects. Possible values are `curly` (default) and `list`. - `PairRepresentation` - Pair representation to be used when decoding TOON objects. Possible values are `dash` (default), `equal`, and `colon`. - `StringRepresentation` - Text representation to be used when decoding TOON strings. Possible values are `atom` (default), `chars`, and `codes`. TOON (Token-Oriented Object Notation) parser and generator. TOON is a compact, human-readable, line-oriented format that encodes the JSON data model. **Availability:** `logtalk_load(toon(loader))` **Author:** Paulo Moura **Version:** 0:2:0 **Date:** 2026-04-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` toon_protocol **Uses:** list meta reader **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `toon_protocol` TOON (Token-Oriented Object Notation) parser and generator protocol. **Availability:** `logtalk_load(toon(loader))` **Author:** Paulo Moura **Version:** 0:1:0 **Date:** 2025-12-15 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses the TOON contents read from the given source (`codes(List)`, `stream(Stream)`, `file(Path)`, `chars(List)`, or `atom(Atom)`) into a term. Throws an error if the TOON contents cannot be parsed. **Compilation flags:** `static` **Template:** `parse(Source,Term)` **Mode and number of proofs:** `parse(++compound,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(toon_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates the content using the representation specified in the first argument (`codes(List)`, `stream(Stream)`, `file(Path)`, `chars(List)`, or `atom(Atom)`) for the term in the second argument. Throws an error if this term cannot be processed. **Compilation flags:** `static` **Template:** `generate(Sink,Term)` **Mode and number of proofs:** `generate(+compound,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid sink: `domain_error(toon_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### toychr") **object** #### `toychrdb` Simple CHR interpreter/debugger based on the refined operational semantics of CHRs. **Availability:** `logtalk_load(toychr(loader))` **Author:** Gregory J. Duck; adapted to Logtalk by Paulo Moura. **Version:** 0:7:2 **Date:** 2026-04-06 **Copyright:** Copright 2004 Gregory J. Duck; Copyright 2019-2024 Paulo Moura **License:** GPL-2.0-or-later **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Uses:** list user **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - `chr_is/2` - `chr_trace/0` - `chr_notrace/0` - `chr_spy/1` - `chr_nospy/0` - `chr_no_spy/1` - `chr_option/2` - Protected predicates - `current_prog/1` - `chr_option_print_trace/0` - `chr_option_trace_interactive/0` - `chr_option_optimization_level/1` - `chr_option_show_stack/0` - `chr_option_show_store/0` - `chr_option_show_history/0` - `chr_option_show_id/0` - `chr_option_allow_deep_guards/0` - `chr_next_state/1` - `chr_spy_point/1` - Private predicates - `chr_rule_/1` - Operators ##### Public predicates ###### `chr_is/2` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `chr_trace/0` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `chr_notrace/0` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `chr_spy/1` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `chr_nospy/0` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `chr_no_spy/1` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `chr_option/2` **Compilation flags:** `static` ------------------------------------------------------------------------ ##### Protected predicates ###### `current_prog/1` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `chr_option_print_trace/0` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_option_trace_interactive/0` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_option_optimization_level/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_option_show_stack/0` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_option_show_store/0` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_option_show_history/0` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_option_show_id/0` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_option_allow_deep_guards/0` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_next_state/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ###### `chr_spy_point/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ##### Private predicates ###### `chr_rule_/1` **Compilation flags:** `dynamic` ------------------------------------------------------------------------ ##### Operators (none) ### truncated_svd_projection") **object** #### `truncated_svd_projection` Truncated singular value decomposition reducer for continuous datasets using a portable two-sided power-iteration solver over the data matrix. **Availability:** `logtalk_load(truncated_svd_projection(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-07 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` dimension_reducer_common **Uses:** format linear_algebra list numberlist pairs population type **Remarks:** (none) **Inherited public predicates:**  check_dimension_reducer/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  dimension_reducer_options/2  export_to_clauses/4  export_to_file/4  learn/2  option/2  option/3  print_dimension_reducer/1  transform/3  valid_dimension_reducer/1  valid_option/1  valid_options/1 - Public predicates - `learn/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `learn/3` Learns a truncated singular value decomposition reducer from the given dataset object using the specified options. **Compilation flags:** `static` **Template:** `learn(Dataset,DimensionReducer,Options)` **Mode and number of proofs:** `learn(+object_identifier,-compound,+list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also pca_projection, random_projection ### tsv") **object** #### `tsv` TSV files reading and writing predicates using the option `Header-keep`. **Availability:** `logtalk_load(tsv(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2023-11-15 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` tsv(keep,false) **Remarks:** (none) **Inherited public predicates:**  read_file/2  read_file/3  read_file_by_line/2  read_file_by_line/3  read_stream/2  read_stream/3  read_stream_by_line/2  read_stream_by_line/3  write_file/3  write_stream/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `tsv(Header)` - `Header` - Header handling option with possible values `skip` and `keep` (default). Backward-compatible parametric object equivalent to using `tsv(_Header_,`` ``false)`. **Availability:** `logtalk_load(tsv(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-02-27 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` tsv(Header,false) **Remarks:** (none) **Inherited public predicates:**  read_file/2  read_file/3  read_file_by_line/2  read_file_by_line/3  read_stream/2  read_stream/3  read_stream_by_line/2  read_stream_by_line/3  write_file/3  write_stream/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `tsv(Header,Comments)` - `Header` - Header handling option with possible values `skip` and `keep` (default). - `Comments` - Comment handling option with possible values `true` and `false` (default). When `true`, lines starting with `#` are skipped when reading TSV files and streams. TSV file and stream reading and writing predicates. **Availability:** `logtalk_load(tsv(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-02-25 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` tsv_protocol **Uses:** list logtalk reader type **Remarks:** (none) **Inherited public predicates:**  read_file/2  read_file/3  read_file_by_line/2  read_file_by_line/3  read_stream/2  read_stream/3  read_stream_by_line/2  read_stream_by_line/3  write_file/3  write_stream/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `tsv_protocol` TSV file and stream reading and writing protocol. **Availability:** `logtalk_load(tsv(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2025-05-07 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** > - Type-checking: Some of the predicate file and stream argument type-checking exceptions depend on the Prolog backend compliance with standards. **Inherited public predicates:** (none) - Public predicates - `read_file/3` - `read_stream/3` - `read_file/2` - `read_stream/2` - `read_file_by_line/3` - `read_stream_by_line/3` - `read_file_by_line/2` - `read_stream_by_line/2` - `write_file/3` - `write_stream/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `read_file/3` Reads a TSV file saving the data as clauses for the specified object predicate. Fails if the file cannot be parsed. **Compilation flags:** `static` **Template:** `read_file(File,Object,Predicate)` **Mode and number of proofs:** `read_file(+atom,+object_identifier,+predicate_indicator)` - `zero_or_one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be opened for reading: `permission_error(open,source_sink,File)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `read_stream/3` Reads a TSV stream saving the data as clauses for the specified object predicate. Fails if the stream cannot be parsed. **Compilation flags:** `static` **Template:** `read_stream(Stream,Object,Predicate)` **Mode and number of proofs:** `read_stream(+stream_or_alias,+object_identifier,+predicate_indicator)` - `zero_or_one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an output stream: `permission_error(input,stream,Stream)` `Stream` is a binary stream: `permission_error(input,binary_stream,Stream)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `read_file/2` Reads a TSV file returning the data as a list of rows, each row a list of fields. Fails if the file cannot be parsed. **Compilation flags:** `static` **Template:** `read_file(File,Rows)` **Mode and number of proofs:** `read_file(+atom,-list(list))` - `zero_or_one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be opened for reading: `permission_error(open,source_sink,File)` ------------------------------------------------------------------------ ###### `read_stream/2` Reads a TSV stream returning the data as a list of rows, each row a list of fields. Fails if the stream cannot be parsed. **Compilation flags:** `static` **Template:** `read_stream(Stream,Rows)` **Mode and number of proofs:** `read_stream(+stream_or_alias,-list(list))` - `zero_or_one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an output stream: `permission_error(input,stream,Stream)` `Stream` is a binary stream: `permission_error(input,binary_stream,Stream)` ------------------------------------------------------------------------ ###### `read_file_by_line/3` Reads a TSV file saving the data as clauses for the specified object predicate. The file is read line by line. Fails if the file cannot be parsed. **Compilation flags:** `static` **Template:** `read_file_by_line(File,Object,Predicate)` **Mode and number of proofs:** `read_file_by_line(+atom,+object_identifier,+predicate_indicator)` - `zero_or_one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be opened for reading: `permission_error(open,source_sink,File)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `read_stream_by_line/3` Reads a TSV stream saving the data as clauses for the specified object predicate. The stream is read line by line. Fails if the stream cannot be parsed. **Compilation flags:** `static` **Template:** `read_stream_by_line(Stream,Object,Predicate)` **Mode and number of proofs:** `read_stream_by_line(+stream_or_alias,+object_identifier,+predicate_indicator)` - `zero_or_one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an output stream: `permission_error(input,stream,Stream)` `Stream` is a binary stream: `permission_error(input,binary_stream,Stream)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `read_file_by_line/2` Reads a TSV file returning the data as a list of rows, each row a list of fields. The file is read line by line. Fails if the file cannot be parsed. **Compilation flags:** `static` **Template:** `read_file_by_line(File,Rows)` **Mode and number of proofs:** `read_file_by_line(+atom,-list(list))` - `zero_or_one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but not an existing file: `existence_error(file,File)` `File` is an existing file but cannot be opened for reading: `permission_error(open,source_sink,File)` ------------------------------------------------------------------------ ###### `read_stream_by_line/2` Reads a TSV stream returning the data as a list of rows, each row a list of fields. The stream is read line by line. Fails if the stream cannot be parsed. **Compilation flags:** `static` **Template:** `read_stream_by_line(Stream,Rows)` **Mode and number of proofs:** `read_stream_by_line(+stream_or_alias,-list(list))` - `zero_or_one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an output stream: `permission_error(input,stream,Stream)` `Stream` is a binary stream: `permission_error(input,binary_stream,Stream)` ------------------------------------------------------------------------ ###### `write_file/3` Writes a TSV file with the data represented by the solutions to the specified object predicate. **Compilation flags:** `static` **Template:** `write_file(File,Object,Predicate)` **Mode and number of proofs:** `write_file(+atom,+object_identifier,+predicate_indicator)` - `one` **Exceptions:** `File` is a variable: `instantiation_error` `File` is neither a variable nor an atom: `type_error(atom,File)` `File` is an atom but cannot be opened for writing: `permission_error(open,source_sink,File)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ###### `write_stream/3` Writes a TSV stream with the data represented by the solutions to the specified object predicate. **Compilation flags:** `static` **Template:** `write_stream(Stream,Object,Predicate)` **Mode and number of proofs:** `write_stream(+stream_or_alias,+object_identifier,+predicate_indicator)` - `one` **Exceptions:** `Stream` is a variable: `instantiation_error` `Stream` is neither a variable nor a stream-term or alias: `domain_error(stream_or_alias,Stream)` `Stream` is not an open stream: `existence_error(stream,Stream)` `Stream` is an input stream: `permission_error(output,stream,Stream)` `Stream` is a binary stream: `permission_error(output,binary_stream,Stream)` `Object` is a variable: `instantiation_error` `Object` is neither a variable nor an object identifier: `type_error(object_identifier,Object)` `Object` is a valid object identifier but not an existing object: `existence_error(object,Object)` `Predicate` is a variable: `instantiation_error` `Predicate` is neither a variable nor a predicate indicator: `type_error(predicate_indicator,Predicate)` `Predicate` is a valid predicate indicator but not an existing public predicate: `existence_error(predicate,Predicate)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### tutor") **object** #### `tutor` This object adds explanations and suggestions to selected compiler and developer tool warning and error messages. **Availability:** `logtalk_load(tutor(loader))` **Author:** Paulo Moura **Version:** 0:86:0 **Date:** 2026-03-28 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` tutor_explanations **Provides:** logtalk::message_hook/4 **Uses:** list logtalk **Remarks:** > - Usage: Simply load this object at startup using the goal `logtalk_load(tutor(loader))`. **Inherited public predicates:**  explain//1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `tutor_explanations` This category provides explanations and suggestions to selected compiler and developer tool warning and error messages. **Availability:** `logtalk_load(tutor(loader))` **Author:** Paulo Moura **Version:** 0:87:0 **Date:** 2026-03-30 **Compilation flags:** `static` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `explain//1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `explain//1` Generates an explanation for a message. **Compilation flags:** `static` **Template:** `explain(Message)` **Mode and number of proofs:** `explain(@callable)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### types") **object** #### `atom` Atom data type predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:9:0 **Date:** 2023-04-12 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` atomic **Uses:** user **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  check/1  depth/2  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `replace_sub_atom/4` - `split/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `replace_sub_atom/4` Replaces all occurrences of `Old` by `New` in `Input` returning `Output`. Returns `Input` if `Old` is the empty atom. Fails when `Output` does not unify with the resulting atom. **Compilation flags:** `static` **Template:** `replace_sub_atom(Old,New,Input,Output)` **Mode and number of proofs:** `replace_sub_atom(+atom,+atom,+atom,?atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `split/3` Splits an atom at a given delimiter into a list of sub-atoms. **Compilation flags:** `static` **Template:** `split(Atom,Delimiter,SubAtoms)` **Mode and number of proofs:** `split(+atom,+atom,-list(atom))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `atomic` Atomic data type predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2018-07-11 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` term **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  check/1  depth/2  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `callable` Callable term type predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:4:0 **Date:** 2018-07-11 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` term **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  check/1  depth/2  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `character` Character predicates (most of them assume an ASCII representation). **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:9:0 **Date:** 2019-06-29 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` characterp **Extends:** `public` atom **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  check/1  depth/2  ground/1  is_alpha/1  is_alphanumeric/1  is_ascii/1  is_bin_digit/1  is_control/1  is_dec_digit/1  is_end_of_line/1  is_hex_digit/1  is_layout/1  is_letter/1  is_lower_case/1  is_newline/1  is_octal_digit/1  is_period/1  is_punctuation/1  is_quote/1  is_upper_case/1  is_vowel/1  is_white_space/1  lower_upper/2  new/1  numbervars/1  numbervars/3  occurs/2  parenthesis/2  replace_sub_atom/4  singletons/2  split/3  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `characterp` Character protocol. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2019-06-29 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `is_ascii/1` - `is_alphanumeric/1` - `is_alpha/1` - `is_letter/1` - `is_bin_digit/1` - `is_octal_digit/1` - `is_dec_digit/1` - `is_hex_digit/1` - `is_lower_case/1` - `is_upper_case/1` - `is_vowel/1` - `is_white_space/1` - `is_layout/1` - `is_quote/1` - `is_punctuation/1` - `is_period/1` - `is_control/1` - `is_newline/1` - `is_end_of_line/1` - `parenthesis/2` - `lower_upper/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `is_ascii/1` True if the argument is an ASCII character. **Compilation flags:** `static` **Template:** `is_ascii(Char)` **Mode and number of proofs:** `is_ascii(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_alphanumeric/1` True if the argument is an alphanumeric character. **Compilation flags:** `static` **Template:** `is_alphanumeric(Char)` **Mode and number of proofs:** `is_alphanumeric(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_alpha/1` True if the argument is a letter or an underscore. **Compilation flags:** `static` **Template:** `is_alpha(Char)` **Mode and number of proofs:** `is_alpha(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_letter/1` True if the argument is a letter. **Compilation flags:** `static` **Template:** `is_letter(Char)` **Mode and number of proofs:** `is_letter(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_bin_digit/1` True if the argument is a binary digit. **Compilation flags:** `static` **Template:** `is_bin_digit(Char)` **Mode and number of proofs:** `is_bin_digit(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_octal_digit/1` True if the argument is an octal digit. **Compilation flags:** `static` **Template:** `is_octal_digit(Char)` **Mode and number of proofs:** `is_octal_digit(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_dec_digit/1` True if the argument is a decimal digit. **Compilation flags:** `static` **Template:** `is_dec_digit(Char)` **Mode and number of proofs:** `is_dec_digit(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_hex_digit/1` True if the argument is an hexadecimal digit. **Compilation flags:** `static` **Template:** `is_hex_digit(Char)` **Mode and number of proofs:** `is_hex_digit(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_lower_case/1` True if the argument is a lower case letter. **Compilation flags:** `static` **Template:** `is_lower_case(Char)` **Mode and number of proofs:** `is_lower_case(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_upper_case/1` True if the argument is a upper case letter. **Compilation flags:** `static` **Template:** `is_upper_case(Char)` **Mode and number of proofs:** `is_upper_case(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_vowel/1` True if the argument is a vowel. **Compilation flags:** `static` **Template:** `is_vowel(Char)` **Mode and number of proofs:** `is_vowel(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_white_space/1` True if the argument is a white space character (a space or a tab) inside a line of characters. **Compilation flags:** `static` **Template:** `is_white_space(Char)` **Mode and number of proofs:** `is_white_space(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_layout/1` True if the argument is a layout character. **Compilation flags:** `static` **Template:** `is_layout(Char)` **Mode and number of proofs:** `is_layout(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_quote/1` True if the argument is a quote character. **Compilation flags:** `static` **Template:** `is_quote(Char)` **Mode and number of proofs:** `is_quote(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_punctuation/1` True if the argument is a sentence punctuation character. **Compilation flags:** `static` **Template:** `is_punctuation(Char)` **Mode and number of proofs:** `is_punctuation(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_period/1` True if the argument is a character that ends a sentence. **Compilation flags:** `static` **Template:** `is_period(Char)` **Mode and number of proofs:** `is_period(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_control/1` True if the argument is an ASCII control character. **Compilation flags:** `static` **Template:** `is_control(Char)` **Mode and number of proofs:** `is_control(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_newline/1` True if the argument is the ASCII newline character. **Compilation flags:** `static` **Template:** `is_newline(Char)` **Mode and number of proofs:** `is_newline(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_end_of_line/1` True if the argument is the ASCII end-of-line character (either a carriage return or a line feed). **Compilation flags:** `static` **Template:** `is_end_of_line(Char)` **Mode and number of proofs:** `is_end_of_line(+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parenthesis/2` Recognizes and converts between open and close parenthesis. **Compilation flags:** `static` **Template:** `parenthesis(Char1,Char2)` **Mode and number of proofs:** `parenthesis(?char,?char)` - `zero_or_more` `parenthesis(+char,?char)` - `zero_or_one` `parenthesis(?char,+char)` - `zero_or_one` ------------------------------------------------------------------------ ###### `lower_upper/2` Recognizes and converts between lower and upper case letters. **Compilation flags:** `static` **Template:** `lower_upper(Char1,Char2)` **Mode and number of proofs:** `lower_upper(?char,?char)` - `zero_or_more` `lower_upper(+char,?char)` - `zero_or_one` `lower_upper(?char,+char)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also character **protocol** #### `comparingp` Comparing protocol using overloading of standard operators. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2000-07-24 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `(<)/2` - `(=<)/2` - `(>)/2` - `(>=)/2` - `(=:=)/2` - `(=\=)/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `(<)/2` True if `Term1` is less than `Term2`. **Compilation flags:** `static` **Template:** `Term1)/2` True if `Term1` is greater than `Term2`. **Compilation flags:** `static` **Template:** `Term1>Term2` **Mode and number of proofs:** `+term>`` ``+term` - `zero_or_one` ------------------------------------------------------------------------ ###### `(>=)/2` True if `Term1` is equal or grater than `Term2`. **Compilation flags:** `static` **Template:** `Term1>=Term2` **Mode and number of proofs:** `+term>=`` ``+term` - `zero_or_one` ------------------------------------------------------------------------ ###### `(=:=)/2` True if `Term1` is equal to `Term2`. **Compilation flags:** `static` **Template:** `Term1=:=Term2` **Mode and number of proofs:** `+term=:=`` ``+term` - `zero_or_one` ------------------------------------------------------------------------ ###### `(=\=)/2` True if `Term1` is not equal to `Term2`. **Compilation flags:** `static` **Template:** `Term1=\=Term2` **Mode and number of proofs:** `+term=\=`` ``+term` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `compound` Compound data type. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2018-07-11 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` term **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  check/1  depth/2  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `difflist` Difference list predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 2:1:0 **Date:** 2026-02-03 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` listp **Extends:** `public` compound **Uses:** list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  append/2  append/3  check/1  delete/3  delete_matches/3  depth/2  drop/3  empty/1  flatten/2  ground/1  hamming_distance/3  keysort/2  last/2  length/2  max/2  member/2  memberchk/2  min/2  msort/2  msort/3  new/1  nextto/3  nth0/3  nth0/4  nth1/3  nth1/4  numbervars/1  numbervars/3  occurrences/2  occurrences/3  occurs/2  partition/5  permutation/2  prefix/2  prefix/3  proper_prefix/2  proper_prefix/3  proper_suffix/2  proper_suffix/3  remove_duplicates/2  reverse/2  same_length/2  same_length/3  select/3  select/4  selectchk/3  selectchk/4  sequential_occurrences/2  sequential_occurrences/3  singletons/2  sort/2  sort/3  sort/4  split/4  sublist/2  subsequence/3  subsequence/4  substitute/4  subsumes/2  subterm/2  subtract/3  suffix/2  suffix/3  take/3  take/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `add/3` - `as_list/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `add/3` Adds a term to the end of a difference list. **Compilation flags:** `static` **Template:** `add(Term,DiffList,NewDiffList)` **Mode and number of proofs:** `add(@term,+difference_list,-difference_list)` - `one` ------------------------------------------------------------------------ ###### `as_list/2` Returns a list with the elements of the difference list. **Compilation flags:** `static` **Template:** `as_list(DiffList,List)` **Mode and number of proofs:** `as_list(@difference_list,-list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also list, list(Type), numberlist, varlist **object** #### `float` Floating point numbers data type predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:7:0 **Date:** 2025-02-25 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` number **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  =~= / 2  (\>)/2  (\>=)/2  approximately_equal/2  approximately_equal/3  check/1  depth/2  essentially_equal/3  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  tolerance_equal/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `between/4` - `sequence/4` - `sequence/5` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `between/4` Enumerates by backtracking a sequence of `N` equally spaced floats in the interval `[Lower,Upper]`. Assumes `N`` ``>`` ``0` and `Lower`` ``=<`` ``Upper`; fails otherwise. **Compilation flags:** `static` **Template:** `between(Lower,Upper,N,Float)` **Mode and number of proofs:** `between(+float,+float,+positive_integer,-float)` - `zero_or_more` ------------------------------------------------------------------------ ###### `sequence/4` Generates a list with the sequence of `N` equally spaced floats in the interval `[Lower,Upper]`. Assumes `N`` ``>`` ``0` and `Lower`` ``=<`` ``Upper`; fails otherwise. **Compilation flags:** `static` **Template:** `sequence(Lower,Upper,N,List)` **Mode and number of proofs:** `sequence(+float,+float,+positive_integer,-list(float))` - `zero_or_one` ------------------------------------------------------------------------ ###### `sequence/5` Generates a list with the sequence of `Step` spaced floats in the interval `[Lower,Upper]`. Also returns the length of the list. Assumes `Lower`` ``=<`` ``Upper`; fails otherwise. **Compilation flags:** `static` **Template:** `sequence(Lower,Upper,Step,List,Length)` **Mode and number of proofs:** `sequence(+float,+float,+float,-list(float),-positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `integer` Integer data type predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:56:0 **Date:** 2025-05-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` number **Remarks:** > - Portability notes: This object will use the backend Prolog system `between/3`, `plus/3`, and `succ/2` built-in predicates when available. **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  =~= / 2  (\>)/2  (\>=)/2  approximately_equal/2  approximately_equal/3  check/1  depth/2  essentially_equal/3  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  tolerance_equal/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `between/3` - `plus/3` - `succ/2` - `sequence/3` - `sequence/4` - `power_sequence/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `between/3` Returns integers in the interval defined by the two first arguments. **Compilation flags:** `static` **Template:** `between(Lower,Upper,Integer)` **Mode and number of proofs:** `between(+integer,+integer,+integer)` - `zero_or_one` `between(+integer,+integer,-integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `plus/3` Reversible integer sum. At least two of the arguments must be instantiated to integers. **Compilation flags:** `static` **Template:** `plus(I,J,Sum)` **Mode and number of proofs:** `plus(+integer,+integer,?integer)` - `zero_or_one` `plus(+integer,?integer,+integer)` - `zero_or_one` `plus(?integer,+integer,+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `succ/2` Successor of a natural number. At least one of the arguments must be instantiated to a natural number. **Compilation flags:** `static` **Template:** `succ(I,J)` **Mode and number of proofs:** `succ(+integer,?integer)` - `zero_or_one` `succ(?integer,+integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sequence/3` Generates a list with the sequence of all integers in the interval `[Lower,Upper]`. Assumes `Lower`` ``=<`` ``Upper` and fails otherwise. **Compilation flags:** `static` **Template:** `sequence(Lower,Upper,List)` **Mode and number of proofs:** `sequence(+integer,+integer,-list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ###### `sequence/4` Generates a list with the sequence of integers in the interval `[Lower,Upper]` by `Step`. Assumes `Lower`` ``=<`` ``Upper,`` ``Step`` ``>=`` ``1` and fails otherwise. **Compilation flags:** `static` **Template:** `sequence(Lower,Upper,Step,List)` **Mode and number of proofs:** `sequence(+integer,+integer,+integer,-list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ###### `power_sequence/4` Generates a list of exponentiation results given `[Lower,Upper]` sequence of exponents and `Base`. Assumes `Lower`` ``=<`` ``Upper` and `Base`` ``>`` ``1` and fails otherwise. **Compilation flags:** `static` **Template:** `power_sequence(Lower,Upper,Base,List)` **Mode and number of proofs:** `power_sequence(+integer,+integer,+integer,-list(integer))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `list` List predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 4:4:0 **Date:** 2026-02-03 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` listp **Extends:** `public` compound **Remarks:** > - Portability notes: This object will use the backend Prolog system `msort/2` and `sort/4` built-in predicates when available. **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  append/2  append/3  check/1  delete/3  delete_matches/3  depth/2  drop/3  empty/1  flatten/2  ground/1  hamming_distance/3  keysort/2  last/2  length/2  max/2  member/2  memberchk/2  min/2  msort/2  msort/3  new/1  nextto/3  nth0/3  nth0/4  nth1/3  nth1/4  numbervars/1  numbervars/3  occurrences/2  occurrences/3  occurs/2  partition/5  permutation/2  prefix/2  prefix/3  proper_prefix/2  proper_prefix/3  proper_suffix/2  proper_suffix/3  remove_duplicates/2  reverse/2  same_length/2  same_length/3  select/3  select/4  selectchk/3  selectchk/4  sequential_occurrences/2  sequential_occurrences/3  singletons/2  sort/2  sort/3  sort/4  split/4  sublist/2  subsequence/3  subsequence/4  substitute/4  subsumes/2  subterm/2  subtract/3  suffix/2  suffix/3  take/3  take/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `as_difflist/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `as_difflist/2` Converts a list to a difference list. **Compilation flags:** `static` **Template:** `as_difflist(List,Diffist)` **Mode and number of proofs:** `as_difflist(+list,-difference_list)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also list(Type), numberlist, varlist, difflist **object** #### `list(Type)` List predicates with elements constrained to a single type. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:22:0 **Date:** 2018-07-11 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  append/2  append/3  as_difflist/2  check/1  delete/3  delete_matches/3  depth/2  drop/3  empty/1  flatten/2  ground/1  hamming_distance/3  keysort/2  last/2  length/2  max/2  member/2  memberchk/2  min/2  msort/2  msort/3  new/1  nextto/3  nth0/3  nth0/4  nth1/3  nth1/4  numbervars/1  numbervars/3  occurrences/2  occurrences/3  occurs/2  partition/5  permutation/2  prefix/2  prefix/3  proper_prefix/2  proper_prefix/3  proper_suffix/2  proper_suffix/3  remove_duplicates/2  reverse/2  same_length/2  same_length/3  select/3  select/4  selectchk/3  selectchk/4  sequential_occurrences/2  sequential_occurrences/3  singletons/2  sort/2  sort/3  sort/4  split/4  sublist/2  subsequence/3  subsequence/4  substitute/4  subsumes/2  subterm/2  subtract/3  suffix/2  suffix/3  take/3  take/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also list, numberlist, varlist, difflist **protocol** #### `listp` List protocol. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:19:0 **Date:** 2026-02-03 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `append/2` - `append/3` - `delete/3` - `delete_matches/3` - `empty/1` - `flatten/2` - `hamming_distance/3` - `keysort/2` - `last/2` - `length/2` - `max/2` - `member/2` - `memberchk/2` - `min/2` - `msort/2` - `msort/3` - `nextto/3` - `nth0/3` - `nth0/4` - `nth1/3` - `nth1/4` - `sequential_occurrences/2` - `sequential_occurrences/3` - `occurrences/2` - `occurrences/3` - `partition/5` - `permutation/2` - `prefix/2` - `prefix/3` - `proper_prefix/2` - `proper_prefix/3` - `remove_duplicates/2` - `reverse/2` - `same_length/2` - `same_length/3` - `select/3` - `selectchk/3` - `select/4` - `selectchk/4` - `sort/2` - `sort/3` - `sort/4` - `split/4` - `sublist/2` - `subsequence/3` - `subsequence/4` - `substitute/4` - `subtract/3` - `suffix/2` - `suffix/3` - `proper_suffix/2` - `proper_suffix/3` - `take/3` - `take/4` - `drop/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `append/2` Appends all lists in a list of lists. **Compilation flags:** `static` **Template:** `append(Lists,Concatenation)` **Mode and number of proofs:** `append(+list(list),?list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `append/3` Appends two lists. **Compilation flags:** `static` **Template:** `append(List1,List2,List)` **Mode and number of proofs:** `append(?list,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `delete/3` Deletes from a list all occurrences of an element returning the list of remaining elements. Uses `==/2` for element comparison. **Compilation flags:** `static` **Template:** `delete(List,Element,Remaining)` **Mode and number of proofs:** `delete(@list,@term,?list)` - `one` ------------------------------------------------------------------------ ###### `delete_matches/3` Deletes all matching elements from a list, returning the list of remaining elements. Uses `=/2` for element comparison. **Compilation flags:** `static` **Template:** `delete_matches(List,Element,Remaining)` **Mode and number of proofs:** `delete_matches(@list,@term,?list)` - `one` ------------------------------------------------------------------------ ###### `empty/1` True if the argument is an empty list. **Compilation flags:** `static` **Template:** `empty(List)` **Mode and number of proofs:** `empty(@list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `flatten/2` Flattens a list of lists into a list. **Compilation flags:** `static` **Template:** `flatten(List,Flatted)` **Mode and number of proofs:** `flatten(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `hamming_distance/3` Calculates the Hamming distance between two lists (using equality to compare list elements). Fails if the two lists are not of the same length. **Compilation flags:** `static` **Template:** `hamming_distance(List1,List2,Distance)` **Mode and number of proofs:** `hamming_distance(+list,+list,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `keysort/2` Sorts a list of key-value pairs in ascending order. **Compilation flags:** `static` **Template:** `keysort(List,Sorted)` **Mode and number of proofs:** `keysort(+list(pair),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `last/2` List last element (if it exists). **Compilation flags:** `static` **Template:** `last(List,Last)` **Mode and number of proofs:** `last(?list,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `length/2` List length. **Compilation flags:** `static` **Template:** `length(List,Length)` **Mode and number of proofs:** `length(?list,?integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `max/2` Determines the list maximum value using standard order. Fails if the list is empty. **Compilation flags:** `static` **Template:** `max(List,Maximum)` **Mode and number of proofs:** `max(+list,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `member/2` Element is a list member. **Compilation flags:** `static` **Template:** `member(Element,List)` **Mode and number of proofs:** `member(?term,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `memberchk/2` Checks if a term is a member of a list. **Compilation flags:** `static` **Template:** `memberchk(Element,List)` **Mode and number of proofs:** `memberchk(?term,?list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `min/2` Determines the minimum value in a list using standard order. Fails if the list is empty. **Compilation flags:** `static` **Template:** `min(List,Minimum)` **Mode and number of proofs:** `min(+list,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `msort/2` Sorts a list in ascending order (duplicated elements are not removed). **Compilation flags:** `static` **Template:** `msort(List,Sorted)` **Mode and number of proofs:** `msort(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `msort/3` Sorts a list using a user-specified comparison predicate modeled on the standard `compare/3` predicate (duplicated elements are not removed). **Compilation flags:** `static` **Template:** `msort(Closure,List,Sorted)` **Meta-predicate template:** `msort(3,*,*)` **Mode and number of proofs:** `msort(+callable,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `nextto/3` `X` and `Y` are consecutive elements in List. **Compilation flags:** `static` **Template:** `nextto(X,Y,List)` **Mode and number of proofs:** `nextto(?term,?term,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth0/3` Nth element of a list (counting from zero). **Compilation flags:** `static` **Template:** `nth0(Nth,List,Element)` **Mode and number of proofs:** `nth0(?integer,?list,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth0/4` Nth element of a list (counting from zero). `Rest` is a list of all the other elements. Can be used to either select the nth element of `List` or to insert an element before the nth element in `Rest`. **Compilation flags:** `static` **Template:** `nth0(Nth,List,Element,Rest)` **Mode and number of proofs:** `nth0(?integer,?list,?term,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth1/3` Nth element of a list (counting from one). **Compilation flags:** `static` **Template:** `nth1(Nth,List,Element)` **Mode and number of proofs:** `nth1(?integer,?list,?term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth1/4` Nth element of a list (counting from one). `Rest` is a list of all the other elements. Can be used to either select the nth element of `List` or to insert an element before the nth element in `Rest`. **Compilation flags:** `static` **Template:** `nth1(Nth,List,Element,Rest)` **Mode and number of proofs:** `nth1(?integer,?list,?term,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `sequential_occurrences/2` Counts the number of sequential occurrences of each `List` element, unifying `Occurrences` with a list of `Element-Count` pairs. Uses term equality for element comparison. **Compilation flags:** `static` **Template:** `sequential_occurrences(List,Occurrences)` **Mode and number of proofs:** `sequential_occurrences(@list,-list(pair(term,positive_integer)))` - `one` ------------------------------------------------------------------------ ###### `sequential_occurrences/3` Counts the number of sequential occurrences of each `List` element, unifying `Occurrences` with a list of `Element-Count` pairs. Uses `Closure` for element comparison. **Compilation flags:** `static` **Template:** `sequential_occurrences(List,Closure,Occurrences)` **Mode and number of proofs:** `sequential_occurrences(@list,@callable,-list(pair(term,positive_integer)))` - `one` ------------------------------------------------------------------------ ###### `occurrences/2` Counts the number of occurrences of each `List` element, unifying `Occurrences` with a sorted list of `Element-Count` pairs. Uses term equality for element comparison. **Compilation flags:** `static` **Template:** `occurrences(List,Occurrences)` **Mode and number of proofs:** `occurrences(@list,-list(pair(term,positive_integer)))` - `one` ------------------------------------------------------------------------ ###### `occurrences/3` Counts the number of occurrences of each `List` element, unifying `Occurrences` with a sorted list of `Element-Count` pairs. Uses `Closure` for element comparison. **Compilation flags:** `static` **Template:** `occurrences(List,Closure,Occurrences)` **Meta-predicate template:** `occurrences(*,2,*)` **Mode and number of proofs:** `occurrences(@list,@callable,-list(pair(term,positive_integer)))` - `one` ------------------------------------------------------------------------ ###### `partition/5` Partitions a list in lists with values less, equal, and greater than a given value (using standard order). **Compilation flags:** `static` **Template:** `partition(List,Value,Less,Equal,Greater)` **Mode and number of proofs:** `partition(+list,+number,-list,-list,-list)` - `one` ------------------------------------------------------------------------ ###### `permutation/2` The two lists are a permutation of the same list. **Compilation flags:** `static` **Template:** `permutation(List,Permutation)` **Mode and number of proofs:** `permutation(?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `prefix/2` `Prefix` is a prefix of `List`. **Compilation flags:** `static` **Template:** `prefix(Prefix,List)` **Mode and number of proofs:** `prefix(?list,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `prefix/3` `Prefix` is a prefix of length `Length` of `List`. **Compilation flags:** `static` **Template:** `prefix(Prefix,Length,List)` **Mode and number of proofs:** `prefix(?list,+integer,+list)` - `zero_or_one` `prefix(?list,-integer,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `proper_prefix/2` `Prefix` is a proper prefix of `List`. **Compilation flags:** `static` **Template:** `proper_prefix(Prefix,List)` **Mode and number of proofs:** `proper_prefix(?list,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `proper_prefix/3` `Prefix` is a proper prefix of length `Length` of `List`. **Compilation flags:** `static` **Template:** `proper_prefix(Prefix,Length,List)` **Mode and number of proofs:** `proper_prefix(?list,+integer,+list)` - `zero_or_one` `proper_prefix(?list,-integer,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `remove_duplicates/2` Removes duplicated list elements using equality (`==/2`) for comparison and keeping the left-most element when repeated. **Compilation flags:** `static` **Template:** `remove_duplicates(List,Set)` **Mode and number of proofs:** `remove_duplicates(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `reverse/2` Reverses a list. **Compilation flags:** `static` **Template:** `reverse(List,Reversed)` **Mode and number of proofs:** `reverse(+list,?list)` - `zero_or_one` `reverse(?list,+list)` - `zero_or_one` `reverse(-list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `same_length/2` The two lists have the same length. **Compilation flags:** `static` **Template:** `same_length(List1,List2)` **Mode and number of proofs:** `same_length(+list,?list)` - `zero_or_one` `same_length(?list,+list)` - `zero_or_one` `same_length(-list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `same_length/3` The two lists have the same length. **Compilation flags:** `static` **Template:** `same_length(List1,List2,Length)` **Mode and number of proofs:** `same_length(+list,?list,?integer)` - `zero_or_one` `same_length(?list,+list,?integer)` - `zero_or_one` `same_length(-list,-list,-integer)` - `one_or_more` ------------------------------------------------------------------------ ###### `select/3` Selects an element from a list, returning the list of remaining elements. **Compilation flags:** `static` **Template:** `select(Element,List,Remaining)` **Mode and number of proofs:** `select(?term,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `selectchk/3` Checks that an element can be selected from a list, returning the list of remaining elements. **Compilation flags:** `static` **Template:** `selectchk(Element,List,Remaining)` **Mode and number of proofs:** `selectchk(?term,?list,?list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `select/4` Selects an element from a list, replacing it by a new element and returning the resulting list. **Compilation flags:** `static` **Template:** `select(Old,OldList,New,NewList)` **Mode and number of proofs:** `select(?term,?list,?term,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `selectchk/4` Checks that an element from a list can be replaced by a new element, returning the resulting list. **Compilation flags:** `static` **Template:** `selectchk(Old,OldList,New,NewList)` **Mode and number of proofs:** `selectchk(?term,?list,?term,?list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sort/2` Sorts a list in ascending order (duplicated elements are removed). **Compilation flags:** `static` **Template:** `sort(List,Sorted)` **Mode and number of proofs:** `sort(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `sort/3` Sorts a list using a user-specified comparison predicate modeled on the standard `compare/3` predicate (duplicated elements are removed). **Compilation flags:** `static` **Template:** `sort(Closure,List,Sorted)` **Meta-predicate template:** `sort(3,*,*)` **Mode and number of proofs:** `sort(+callable,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `sort/4` Sorts a list using the given key and order. Uses the standard term comparison operators for the order. The key selects the argument in each element in the list to use for comparisons. A key value of zero uses the whole element for comparisons. **Compilation flags:** `static` **Template:** `sort(Key,Order,List,Sorted)` **Mode and number of proofs:** `sort(+non_negative_integer,+atom,+list,-list)` - `one` **Remarks:** > - Removing duplicates: Use one of the `@<` or `@>` orders. > > - Keeping duplicates: Use one of the `@=<` or `@>=` orders. > > - Sorting in ascending order: Use one of the `@<` or `@=<` orders. > > - Sorting in descending order: Use one of the `@>` or `@>=` orders. ------------------------------------------------------------------------ ###### `split/4` Splits a list into sublists of a given length. Also returns a list with the remaining elements. Fails if the length is zero or negative. **Compilation flags:** `static` **Template:** `split(List,Length,Sublists,Remaining)` **Mode and number of proofs:** `split(+list,+integer,-list(list),-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sublist/2` The first list is a sublist of the second. **Compilation flags:** `static` **Template:** `sublist(Sublist,List)` **Mode and number of proofs:** `sublist(?list,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `subsequence/3` `List` is an interleaving of `Subsequence` and `Remaining`. Element order is preserved. **Compilation flags:** `static` **Template:** `subsequence(List,Subsequence,Remaining)` **Mode and number of proofs:** `subsequence(?list,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `subsequence/4` Generates subsequences of a given length from a list. Also returns the remaining elements. Element order is preserved. **Compilation flags:** `static` **Template:** `subsequence(List,Length,Subsequence,Remaining)` **Mode and number of proofs:** `subsequence(+list,+integer,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `substitute/4` Substitutes all occurrences of `Old` in `List` by `New`, returning `NewList`. Uses term equality for element comparison. **Compilation flags:** `static` **Template:** `substitute(Old,List,New,NewList)` **Mode and number of proofs:** `substitute(@term,@list,@term,-list)` - `one` ------------------------------------------------------------------------ ###### `subtract/3` Removes all elements in the second list from the first list, returning the list of remaining elements. **Compilation flags:** `static` **Template:** `subtract(List,Elements,Remaining)` **Mode and number of proofs:** `subtract(+list,+list,-list)` - `one` ------------------------------------------------------------------------ ###### `suffix/2` Suffix is a suffix of List. **Compilation flags:** `static` **Template:** `suffix(Suffix,List)` **Mode and number of proofs:** `suffix(?list,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `suffix/3` `Suffix` is a suffix of length `Length` of `List`. **Compilation flags:** `static` **Template:** `suffix(Suffix,Length,List)` **Mode and number of proofs:** `suffix(?list,+integer,+list)` - `zero_or_one` `suffix(?list,-integer,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `proper_suffix/2` `Suffix` is a proper suffix of `List`. **Compilation flags:** `static` **Template:** `proper_suffix(Suffix,List)` **Mode and number of proofs:** `proper_suffix(?list,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `proper_suffix/3` `Suffix` is a proper suffix of length `Length` of `List`. **Compilation flags:** `static` **Template:** `proper_suffix(Suffix,Length,List)` **Mode and number of proofs:** `proper_suffix(?list,+integer,+list)` - `zero_or_one` `proper_suffix(?list,-integer,+list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `take/3` Takes the first `N` elements of a list. Fails if the list have fewer than `N` elements. **Compilation flags:** `static` **Template:** `take(N,List,Elements)` **Mode and number of proofs:** `take(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `take/4` Takes the first `N` elements of a list. Fails if the list have fewer than `N` elements. **Compilation flags:** `static` **Template:** `take(N,List,Elements,Remaining)` **Mode and number of proofs:** `take(+integer,+list,-list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `drop/3` Drops the first `N` elements of a list. Fails if the list have fewer than `N` elements. **Compilation flags:** `static` **Template:** `drop(N,List,Remaining)` **Mode and number of proofs:** `drop(+integer,+list,-list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also list, list(Type), numberlistp, varlistp **object** #### `natural` Natural numbers data type predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 2:3:0 **Date:** 2026-05-13 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` integer **Uses:** list numberlist **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  =~= / 2  (\>)/2  (\>=)/2  approximately_equal/2  approximately_equal/3  between/3  check/1  depth/2  essentially_equal/3  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  plus/3  power_sequence/4  sequence/3  sequence/4  singletons/2  subsumes/2  subterm/2  succ/2  tolerance_equal/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `factorial/2` - `fibonacci/2` - `lucas/2` - `falling_factorial/3` - `rising_factorial/3` - `catalan/2` - `subfactorial/2` - `bell/2` - `stirling_first/3` - `stirling_second/3` - `partition_number/2` - `binomial/3` - `multinomial/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `factorial/2` Computes the factorial of a non-negative integer. **Compilation flags:** `static` **Template:** `factorial(N,Factorial)` **Mode and number of proofs:** `factorial(+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `fibonacci/2` Computes the Fibonacci number of a non-negative integer. **Compilation flags:** `static` **Template:** `fibonacci(N,Fibonacci)` **Mode and number of proofs:** `fibonacci(+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `lucas/2` Computes the Lucas number of a non-negative integer. **Compilation flags:** `static` **Template:** `lucas(N,Lucas)` **Mode and number of proofs:** `lucas(+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `falling_factorial/3` Computes the falling factorial. `N` must be greater than or equal to `K` (fails otherwise). **Compilation flags:** `static` **Template:** `falling_factorial(N,K,FallingFactorial)` **Mode and number of proofs:** `falling_factorial(+non_negative_integer,+non_negative_integer,-non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rising_factorial/3` Computes the rising factorial. **Compilation flags:** `static` **Template:** `rising_factorial(N,K,RisingFactorial)` **Mode and number of proofs:** `rising_factorial(+non_negative_integer,+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `catalan/2` Computes the Catalan number of a non-negative integer. **Compilation flags:** `static` **Template:** `catalan(N,Catalan)` **Mode and number of proofs:** `catalan(+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `subfactorial/2` Computes the subfactorial of a non-negative integer. **Compilation flags:** `static` **Template:** `subfactorial(N,Subfactorial)` **Mode and number of proofs:** `subfactorial(+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `bell/2` Computes the Bell number of a non-negative integer. **Compilation flags:** `static` **Template:** `bell(N,Bell)` **Mode and number of proofs:** `bell(+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `stirling_first/3` Computes the unsigned Stirling number of the first kind. `N` must be greater than or equal to `K` (fails otherwise). **Compilation flags:** `static` **Template:** `stirling_first(N,K,Stirling)` **Mode and number of proofs:** `stirling_first(+non_negative_integer,+non_negative_integer,-non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `stirling_second/3` Computes the Stirling number of the second kind. `N` must be greater than or equal to `K` (fails otherwise). **Compilation flags:** `static` **Template:** `stirling_second(N,K,Stirling)` **Mode and number of proofs:** `stirling_second(+non_negative_integer,+non_negative_integer,-non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `partition_number/2` Computes the partition number of a non-negative integer. **Compilation flags:** `static` **Template:** `partition_number(N,PartitionNumber)` **Mode and number of proofs:** `partition_number(+non_negative_integer,-non_negative_integer)` - `one` ------------------------------------------------------------------------ ###### `binomial/3` Computes the binomial coefficient. `N` must be greater than or equal to `K` (fails otherwise). **Compilation flags:** `static` **Template:** `binomial(N,K,Binomial)` **Mode and number of proofs:** `binomial(+non_negative_integer,+non_negative_integer,-non_negative_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `multinomial/2` Computes the multinomial coefficient for a list of non-negative integers. **Compilation flags:** `static` **Template:** `multinomial(Integers,Multinomial)` **Mode and number of proofs:** `multinomial(+list(non_negative_integer),-non_negative_integer)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `number` Number data type predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:15:0 **Date:** 2026-02-11 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` atomic **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  check/1  depth/2  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - `approximately_equal/2` - `approximately_equal/3` - `essentially_equal/3` - `tolerance_equal/4` - `=~=`` ``/`` ``2` - Protected predicates - Private predicates - Operators - `op(700,xfx,=~=)` ##### Public predicates ###### `approximately_equal/2` Compares two numbers for approximate equality given the `epsilon` arithmetic constant value using the de facto standard formula `abs(Number1`` ``-`` ``Number2)`` ``=<`` ``max(abs(Number1),`` ``abs(Number2))`` ``*`` ``epsilon`. No type-checking. **Compilation flags:** `static` **Template:** `approximately_equal(Number1,Number2)` **Mode and number of proofs:** `approximately_equal(+number,+number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `approximately_equal/3` Compares two numbers for approximate equality given a user-defined epsilon value using the de facto standard formula `abs(Number1`` ``-`` ``Number2)`` ``=<`` ``max(abs(Number1),`` ``abs(Number2))`` ``*`` ``Epsilon`. No type-checking. **Compilation flags:** `static` **Template:** `approximately_equal(Number1,Number2,Epsilon)` **Mode and number of proofs:** `approximately_equal(+number,+number,+number)` - `zero_or_one` **Remarks:** > - Epsilon range: Epsilon should be the `epsilon` arithmetic constant value or a small multiple of it. Only use a larger value if a greater error is expected. > > - Comparison with essential equality: For the same epsilon value, approximate equality is weaker requirement than essential equality. ------------------------------------------------------------------------ ###### `essentially_equal/3` Compares two numbers for essential equality given an epsilon value using the de facto standard formula abs(Number1 - Number2) =\< min(abs(Number1), abs(Number2)) \* Epsilon. No type-checking. **Compilation flags:** `static` **Template:** `essentially_equal(Number1,Number2,Epsilon)` **Mode and number of proofs:** `essentially_equal(+number,+number,+number)` - `zero_or_one` **Remarks:** > - Comparison with approximate equality: For the same epsilon value, essential equality is a stronger requirement than approximate equality. ------------------------------------------------------------------------ ###### `tolerance_equal/4` Compares two numbers for close equality given relative and absolute tolerances using the de facto standard formula abs(Number1 - Number2) =\< max(RelativeTolerance \* max(abs(Number1), abs(Number2)), AbsoluteTolerance). No type-checking. **Compilation flags:** `static` **Template:** `tolerance_equal(Number1,Number2,RelativeTolerance,AbsoluteTolerance)` **Mode and number of proofs:** `tolerance_equal(+number,+number,+number,+number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `=~=`` ``/`` ``2` Compares two floats (or lists of floats) for approximate equality using 100\*epsilon for the absolute error and, if that fails, 99.999% accuracy for the relative error. Note that these precision values may not be adequate for all cases. No type-checking. **Compilation flags:** `static` **Template:** `=~=(Float1,Float2)` **Mode and number of proofs:** `=~=(+number,+number)` - `zero_or_one` `=~=(+list(number),+list(number))` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators ###### `op(700,xfx,=~=)` **Scope:** `public` **object** #### `numberlist` List of numbers predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:20:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` numberlistp **Extends:** `public` list **Uses:** list **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  append/2  append/3  as_difflist/2  average/2  chebyshev_distance/3  chebyshev_norm/2  check/1  delete/3  delete_matches/3  depth/2  drop/3  empty/1  euclidean_distance/3  euclidean_norm/2  flatten/2  ground/1  hamming_distance/3  keysort/2  last/2  least_common_multiple/2  length/2  linear_regression/4  manhattan_distance/3  manhattan_norm/2  max/2  median/2  member/2  memberchk/2  min/2  min_max/3  minkowski_distance/4  modes/2  msort/2  msort/3  new/1  nextto/3  normalize_range/2  normalize_range/4  normalize_scalar/2  normalize_unit/2  nth0/3  nth0/4  nth1/3  nth1/4  numbervars/1  numbervars/3  occurrences/2  occurrences/3  occurs/2  partition/5  permutation/2  prefix/2  prefix/3  product/2  proper_prefix/2  proper_prefix/3  proper_suffix/2  proper_suffix/3  remove_duplicates/2  rescale/3  reverse/2  same_length/2  same_length/3  scalar_product/3  select/3  select/4  selectchk/3  selectchk/4  sequential_occurrences/2  sequential_occurrences/3  singletons/2  softmax/2  softmax/3  sort/2  sort/3  sort/4  split/4  sublist/2  subsequence/3  subsequence/4  substitute/4  subsumes/2  subterm/2  subtract/3  suffix/2  suffix/3  sum/2  take/3  take/4  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also list, list(Type), varlist, difflist **protocol** #### `numberlistp` List of numbers protocol. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:13:0 **Date:** 2026-05-06 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `min/2` - `max/2` - `min_max/3` - `product/2` - `sum/2` - `average/2` - `median/2` - `modes/2` - `euclidean_norm/2` - `chebyshev_norm/2` - `manhattan_norm/2` - `euclidean_distance/3` - `chebyshev_distance/3` - `manhattan_distance/3` - `minkowski_distance/4` - `scalar_product/3` - `normalize_range/2` - `normalize_range/4` - `normalize_unit/2` - `normalize_scalar/2` - `rescale/3` - `least_common_multiple/2` - `softmax/2` - `softmax/3` - `linear_regression/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `min/2` Determines the minimum value in a list using arithmetic order. Fails if the list is empty. **Compilation flags:** `static` **Template:** `min(List,Minimum)` **Mode and number of proofs:** `min(+list(number),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `max/2` Determines the list maximum value using arithmetic order. Fails if the list is empty. **Compilation flags:** `static` **Template:** `max(List,Maximum)` **Mode and number of proofs:** `max(+list(number),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `min_max/3` Determines the minimum and maximum values in a list using arithmetic order. Fails if the list is empty. **Compilation flags:** `static` **Template:** `min_max(List,Minimum,Maximum)` **Mode and number of proofs:** `min_max(+list(number),-number,-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `product/2` Calculates the product of all list numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `product(List,Product)` **Mode and number of proofs:** `product(+list(number),-number)` - `zero_or_one` ------------------------------------------------------------------------ ###### `sum/2` Calculates the sum of all list numbers. Returns the integer zero if the list is empty. **Compilation flags:** `static` **Template:** `sum(List,Sum)` **Mode and number of proofs:** `sum(+list(number),-number)` - `one` ------------------------------------------------------------------------ ###### `average/2` Calculates the average (i.e., arithmetic mean) of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `average(List,Average)` **Mode and number of proofs:** `average(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `median/2` Calculates the median of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `median(List,Median)` **Mode and number of proofs:** `median(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `modes/2` Returns the list of modes of a list of numbers in ascending order. Fails if the list is empty. **Compilation flags:** `static` **Template:** `modes(List,Modes)` **Mode and number of proofs:** `modes(+list(number),-list(number))` - `zero_or_one` ------------------------------------------------------------------------ ###### `euclidean_norm/2` Calculates the Euclidean norm of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `euclidean_norm(List,Norm)` **Mode and number of proofs:** `euclidean_norm(+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `chebyshev_norm/2` Calculates the Chebyshev norm of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `chebyshev_norm(List,Norm)` **Mode and number of proofs:** `chebyshev_norm(+list(integer),-integer)` - `zero_or_one` `chebyshev_norm(+list(float),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `manhattan_norm/2` Calculates the Manhattan norm of a list of numbers. Fails if the list is empty. **Compilation flags:** `static` **Template:** `manhattan_norm(List,Norm)` **Mode and number of proofs:** `manhattan_norm(+list(integer),-integer)` - `zero_or_one` `manhattan_norm(+list(float),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `euclidean_distance/3` Calculates the Euclidean distance between two lists of numbers. Fails if the two lists are empty or not of the same length. **Compilation flags:** `static` **Template:** `euclidean_distance(List1,List2,Distance)` **Mode and number of proofs:** `euclidean_distance(+list(number),+list(number),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `chebyshev_distance/3` Calculates the Chebyshev distance between two lists of numbers. Fails if the two lists are empty or not of the same length. **Compilation flags:** `static` **Template:** `chebyshev_distance(List1,List2,Distance)` **Mode and number of proofs:** `chebyshev_distance(+list(integer),+list(integer),-integer)` - `zero_or_one` `chebyshev_distance(+list(float),+list(float),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `manhattan_distance/3` Calculates the Manhattan distance between two lists of numbers. Fails if the two lists are empty or not of the same length. **Compilation flags:** `static` **Template:** `manhattan_distance(List1,List2,Distance)` **Mode and number of proofs:** `manhattan_distance(+list(integer),+list(integer),-integer)` - `zero_or_one` `manhattan_distance(+list(float),+list(float),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `minkowski_distance/4` Calculates the Minkowski distance between two lists of numbers given a positive power. Fails if the two lists are empty or not of the same length. **Compilation flags:** `static` **Template:** `minkowski_distance(List1,List2,Power,Distance)` **Mode and number of proofs:** `minkowski_distance(+list(number),+list(number),+number,-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `scalar_product/3` Calculates the scalar product of two lists of numbers. Fails if the two lists are empty or not of the same length. **Compilation flags:** `static` **Template:** `scalar_product(List1,List2,Product)` **Mode and number of proofs:** `scalar_product(+list(integer),+list(integer),-integer)` - `zero_or_one` `scalar_product(+list(float),+list(float),-float)` - `zero_or_one` ------------------------------------------------------------------------ ###### `normalize_range/2` Normalizes a list of numbers into the `[0.0,1.0]` range. Caller must handle arithmetic exceptions if the input list if not normalizable. **Compilation flags:** `static` **Template:** `normalize_range(List,NormalizedList)` **Mode and number of proofs:** `normalize_range(+list(number),-list(float))` - `one` ------------------------------------------------------------------------ ###### `normalize_range/4` Normalizes a list of numbers into the given range. Caller must handle arithmetic exceptions if the input list if not normalizable. **Compilation flags:** `static` **Template:** `normalize_range(List,Minimum,Maximum,NormalizedList)` **Mode and number of proofs:** `normalize_range(+list(number),+number,+number,-list(float))` - `one` ------------------------------------------------------------------------ ###### `normalize_unit/2` Normalizes a list of numbers returning its unit vector (i.e., a list with Euclidean norm equal to one). Caller must handle arithmetic exceptions if the input list if not normalizable. **Compilation flags:** `static` **Template:** `normalize_unit(List,NormalizedList)` **Mode and number of proofs:** `normalize_unit(+list(number),-list(float))` - `one` ------------------------------------------------------------------------ ###### `normalize_scalar/2` Normalizes a list of numbers such that the sum of all numbers is equal to one. Caller must handle arithmetic exceptions if the input list if not normalizable. **Compilation flags:** `static` **Template:** `normalize_scalar(List,NormalizedList)` **Mode and number of proofs:** `normalize_scalar(+list(number),-list(float))` - `one` ------------------------------------------------------------------------ ###### `rescale/3` Rescales all numbers in a list by the given factor. **Compilation flags:** `static` **Template:** `rescale(List,Factor,RescaledList)` **Mode and number of proofs:** `rescale(+list(integer),+integer,-list(integer))` - `one` `rescale(+list(number),+float,-list(float))` - `one` ------------------------------------------------------------------------ ###### `least_common_multiple/2` Computes the least common multiple of a list of two or more positive integers. Fails if the list is empty or contains a single element. Fails also if any of the elements is zero. May require backend support for unbound integer arithmetic. **Compilation flags:** `static` **Template:** `least_common_multiple(Integers,LeastCommonMultiple)` **Mode and number of proofs:** `least_common_multiple(+list(positive_integer),-positive_integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `softmax/2` Computes the softmax of a list of floats, returning a probability distribution. The implementation is numerically stable. **Compilation flags:** `static` **Template:** `softmax(Floats,Softmax)` **Mode and number of proofs:** `softmax(+list(float),-list(float))` - `one` ------------------------------------------------------------------------ ###### `softmax/3` Computes the softmax of a list of floats with the given temperature, returning a probability distribution. The implementation is numerically stable. **Compilation flags:** `static` **Template:** `softmax(Floats,Temperature,Softmax)` **Mode and number of proofs:** `softmax(+list(float),+positive_float,-list(float))` - `one` **Remarks:** > - `Temperature`` ``>`` ``1.0`: Makes the distribution more uniform. > > - `Temperature`` ``<`` ``1.0`: Makes the distribution more concentrated on the largest values. > > - `Temperature`` ``=`` ``1.0`: Standard softmax behavior. ------------------------------------------------------------------------ ###### `linear_regression/4` Computes the simple linear regression for the given lists of X and Y coordinates, returning the slope and the intercept. Fails if the lists have less than two elements, are not of the same length, or if all X values are the same. **Compilation flags:** `static` **Template:** `linear_regression(Xs,Ys,Slope,Intercept)` **Mode and number of proofs:** `linear_regression(+list(number),+list(number),-float,-float)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also numberlist, listp, varlistp **object** #### `pairs` Useful predicates over lists of pairs (key-value terms). **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 2:1:1 **Date:** 2023-11-21 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** > - Usage: This object can be loaded independently of other entities in the `types` library by using the goal `logtalk_load(types(pairs))`. **Inherited public predicates:** (none) - Public predicates - `keys_values/3` - `keys/2` - `key/2` - `values/2` - `value/3` - `transpose/2` - `group_sorted_by_key/2` - `group_consecutive_by_key/2` - `group_by_key/2` - `map/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `keys_values/3` Converts between a list of pairs and lists of keys and values. When converting to pairs, this predicate fails if the list of keys and the list of values have different lengths. **Compilation flags:** `static` **Template:** `keys_values(Pairs,Keys,Values)` **Mode and number of proofs:** `keys_values(+list(pair),-list,-list)` - `one` `keys_values(-list(pair),+list,+list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `keys/2` Returns a list of keys from a list of pairs. **Compilation flags:** `static` **Template:** `keys(Pairs,Keys)` **Mode and number of proofs:** `keys(+list(pair),-list)` - `one` ------------------------------------------------------------------------ ###### `key/2` Enumerates by backtracking all keys from a list of pairs. **Compilation flags:** `static` **Template:** `key(Pairs,Key)` **Mode and number of proofs:** `key(+list(pair),-term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `values/2` Returns a list of values from a list of pairs. **Compilation flags:** `static` **Template:** `values(Pairs,Values)` **Mode and number of proofs:** `values(+list(pair),-list)` - `one` ------------------------------------------------------------------------ ###### `value/3` Returns a value addressed by the given path (a key or a list of keys in the case of nested list of pairs). Fails if path does not exist. **Compilation flags:** `static` **Template:** `value(Pairs,Path,Value)` **Mode and number of proofs:** `value(+list(pair),+term,-term)` - `zero_or_one` `value(+list(pair),+list,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `transpose/2` Transposes a list of pairs by swapping each pair key and value. The relative order of the list elements is kept. **Compilation flags:** `static` **Template:** `transpose(Pairs,TransposedPairs)` **Mode and number of proofs:** `transpose(+list(pair),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `group_sorted_by_key/2` Groups pairs by key by sorting them and then constructing new pairs by grouping all values for a given key in a list. Keys are compared using equality. Relative order of values per key is kept. Resulting list of pairs is sorted by key. **Compilation flags:** `static` **Template:** `group_sorted_by_key(Pairs,Groups)` **Mode and number of proofs:** `group_sorted_by_key(+list(pair),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `group_consecutive_by_key/2` Groups pairs by constructing new pairs by grouping all values for consecutive key in a list. Keys are compared using equality. The relative order of the values for the same key is kept. **Compilation flags:** `static` **Template:** `group_consecutive_by_key(Pairs,Groups)` **Mode and number of proofs:** `group_consecutive_by_key(+list(pair),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `group_by_key/2` Same as the `group_sorted_by_key/2` predicate. Deprecated. **Compilation flags:** `static` **Template:** `group_by_key(Pairs,Groups)` **Mode and number of proofs:** `group_by_key(+list(pair),-list(pair))` - `one` ------------------------------------------------------------------------ ###### `map/3` Maps a list into pairs using a closure that applies to each list element to compute its key. **Compilation flags:** `static` **Template:** `map(Closure,List,Pairs)` **Meta-predicate template:** `map(2,*,*)` **Mode and number of proofs:** `map(@callable,+list,-list(pair))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `term` Term utility predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:11:0 **Date:** 2022-05-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` termp **Aliases:** `termp` `variables/2` as `vars/2` **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  check/1  depth/2  ground/1  new/1  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `termp` Term utility predicates protocol. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:35:0 **Date:** 2022-05-13 **Compilation flags:** `static` **Extends:** `public` comparingp **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2 - Public predicates - `depth/2` - `ground/1` - `new/1` - `occurs/2` - `subsumes/2` - `subterm/2` - `valid/1` - `check/1` - `variant/2` - `variables/2` - `singletons/2` - `numbervars/3` - `numbervars/1` - `varnumbers/3` - `varnumbers/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `depth/2` True if the depth of `Term` is `Depth`. The depth of atomic terms is zero; the depth of a compound term is one plus the maximum depth of its sub-terms. **Compilation flags:** `static` **Template:** `depth(Term,Depth)` **Mode and number of proofs:** `depth(@term,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `ground/1` True if the argument is ground. Deprecated. Use the `ground/1` standard predicate instead. **Compilation flags:** `static` **Template:** `ground(Term)` **Mode and number of proofs:** `ground(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `new/1` Creates a new term instance (if meaningful). **Compilation flags:** `static` **Template:** `new(Term)` **Mode and number of proofs:** `new(-nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `occurs/2` True if the variable occurs in the term. **Compilation flags:** `static` **Template:** `occurs(Variable,Term)` **Mode and number of proofs:** `occurs(@var,@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `subsumes/2` The first term subsumes the second term. Deprecated. Use the `subsumes_term/2` standard predicate instead. **Compilation flags:** `static` **Template:** `subsumes(General,Specific)` **Mode and number of proofs:** `subsumes(@term,@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `subterm/2` The first term is a subterm of the second term. **Compilation flags:** `static` **Template:** `subterm(Subterm,Term)` **Mode and number of proofs:** `subterm(?term,+term)` - `zero_or_more` ------------------------------------------------------------------------ ###### `valid/1` Term is valid. **Compilation flags:** `static` **Template:** `valid(Term)` **Mode and number of proofs:** `valid(@nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `check/1` Checks if a term is valid. Throws an exception if the term is not valid. **Compilation flags:** `static` **Template:** `check(Term)` **Mode and number of proofs:** `check(@nonvar)` - `one` ------------------------------------------------------------------------ ###### `variant/2` Each term is a variant of the other (i.e., they are structurally equivalent). **Compilation flags:** `static` **Template:** `variant(Term1,Term2)` **Mode and number of proofs:** `variant(@term,@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `variables/2` Returns a list of all term variables (ordered as found when doing a depth-first, left-to-right traversal of `Term`). Deprecated. Use the standard `term_variables/2` predicate instead. **Compilation flags:** `static` **Template:** `variables(Term,List)` **Mode and number of proofs:** `variables(@term,-list)` - `one` ------------------------------------------------------------------------ ###### `singletons/2` Returns a list of all term singleton variables (ordered as found when doing a depth-first, left-to-right traversal of `Term`). **Compilation flags:** `static` **Template:** `singletons(Term,Singletons)` **Mode and number of proofs:** `singletons(@term,-list)` - `one` ------------------------------------------------------------------------ ###### `numbervars/3` Grounds a term by replacing all variables with `'$VAR'(N)` terms with `N` starting at `From`. The `Next` argument is unified with the next value for `N` after binding all variables. **Compilation flags:** `static` **Template:** `numbervars(Term,From,Next)` **Mode and number of proofs:** `numbervars(?term,+integer,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `numbervars/1` Grounds a term by replacing all variables with `'$VAR'(N)` terms with `N` starting at `0`. **Compilation flags:** `static` **Template:** `numbervars(Term)` **Mode and number of proofs:** `numbervars(?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `varnumbers/3` Replaces all `'$VAR'(N)` sub-terms in a term with fresh variables for all values of `N` grater or equal to `From`. Variables in `Term` are shared with `Copy`. **Compilation flags:** `static` **Template:** `varnumbers(Term,From,Copy)` **Mode and number of proofs:** `varnumbers(@term,+integer,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `varnumbers/2` Replaces all `'$VAR'(N)` sub-terms in a term with fresh variables for all values of `N` grater or equal to `0`. Variables in `Term` are shared with `Copy`. **Compilation flags:** `static` **Template:** `varnumbers(Term,Copy)` **Mode and number of proofs:** `varnumbers(@term,?term)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also term **object** #### `type` Type checking predicates. User extensible. New types can be defined by adding clauses for the `type/1` and `check/2` multifile predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 2:8:0 **Date:** 2026-02-28 **Compilation flags:** `static,`` ``context_switching_calls,`` ``complements(restrict)` **Uses:** list **Remarks:** > - Logtalk specific types: `entity`, `object`, `protocol`, `category`, `entity_identifier`, `object_identifier`, `protocol_identifier`, `category_identifier`, `event`, `predicate`. > > - Prolog module related types (when the backend compiler supports modules): `module`, `module_identifier`, `qualified_callable`. > > - Prolog base types: `term`, `var`, `nonvar`, `atomic`, `atom`, `number`, `integer`, `float`, `compound`, `callable`, `ground`. > > - Atom derived types: `non_quoted_atom`, `non_empty_atom`, `boolean`, `character`, `in_character`, `char`, `operator_specifier`, `hex_char`. > > - Atom derived parametric types: `atom(CharSet)`, `atom(CharSet,Length)`, `non_empty_atom(CharSet)`, `character(CharSet)`, `in_character(CharSet)`, `char(CharSet)`. > > - Number derived types: `positive_number`, `negative_number`, `non_positive_number`, `non_negative_number`. > > - Float derived types: `positive_float`, `negative_float`, `non_positive_float`, `non_negative_float,`` ``probability`. > > - Integer derived types: `positive_integer`, `negative_integer`, `non_positive_integer`, `non_negative_integer`, `byte`, `in_byte`, `character_code`, `in_character_code`, `code`, `operator_priority`, `hex_code`. > > - Integer derived parametric types: `character_code(CharSet)`, `in_character_code(CharSet)`, `code(CharSet)`. > > - List types (compound derived types): `list`, `non_empty_list`, `partial_list`, `list_or_partial_list`, `list(Type)`, `list(Type,Length)`, `list(Type,Min,Max)`, `list(Type,Length,Min,Max)`, `non_empty_list(Type)`, `codes`, `chars`. > > - Difference list types (compound derived types): `difference_list`, `difference_list(Type)`. > > - Other compound derived types: `compound(Name,Types)`, `predicate_indicator`, `non_terminal_indicator`, `predicate_or_non_terminal_indicator`, `clause`, `grammar_rule`, `pair`, `pair(KeyType,ValueType)`, `cyclic`, `acyclic`. > > - Stream types: `stream`, `stream_or_alias`, `stream(Property)`, `stream_or_alias(Property)`. > > - Other types: `text`, `text(CharSet)`, `Object::Closure`, `between(Type,Lower,Upper)`, `property(Type,LambdaExpression)`, `one_of(Type,Set)`, `var_or(Type)`, `ground(Type)`, `types(Types)`, `constrain(Type,Closure)`, `type`. > > - Type `predicate` notes: This type is used to check for an object public predicate specified as `Object::Functor/Arity`. > > - Type `boolean` notes: The two value of this type are the atoms `true` and `false`. > > - Stream types notes: In the case of the `stream(Property)` and `stream_or_alias(Property)` types, Property must be a valid stream property. > > - Type `order` notes: The three possible values of this type are the single character atoms `<`, `=`, and `>`. > > - Type `character_code` notes: This type takes into account Unicode support by the backend compiler. When Unicode is supported, it distinguishes between BMP and full support. When Unicode is not supported, it assumes a byte representation for characters. > > - Types `text` and `text(CharSet)` notes: These types allow text to be represented using atoms, character lists, or character code lists. > > - Type `Object::Closure` notes: Allows calling a public object predicate for type-checking. The predicate should provide `valid/2` predicate semantics and assume called with a bound argument. The `Closure` closure is extended with a single argument, the value to be checked. > > - Type `compound(Name,Types)` notes: This type verifies that a compound term have the given `Name` and its arguments conform to `Types`. > > - Type `between(Type,`` ``Lower,`` ``Upper)` notes: The type argument allows distinguishing between numbers and other types. It also allows choosing between mixed integer/float comparisons and strict float or integer comparisons. The term is type-checked before testing for interval membership. > > - Type `property(Type,`` ``Lambda)` notes: Verifies that `Term` satisfies a property described using a lambda expression of the form `[Parameter]>>Goal`. The lambda expression is applied in the context of `user`. The term is type-checked before calling the goal. > > - Type `one_of(Type,`` ``Set)` notes: For checking if a given term is an element of a set. The set is represented using a list. The term is type-checked before testing for set membership. > > - Type `var_or(Type)` notes: Allows checking if a term is either a variable or a valid value of the given type. > > - Type `ground(Type)` notes: Allows checking if a term is ground and a valid value of the given type. > > - Type `types(Types)` notes: Allows checking if a term is a valid value for one of the types in a list of types. > > - Type `constrain(Type,Closure)` notes: Allows checking if a term is a valid value for the given type and satisfies the given closure. > > - Type `type` notes: Allows checking if a term is a valid type. > > - Type `qualified_callable` notes: Allows checking if a term is a possibly module-qualified callable term. When the term is qualified, it also checks that the qualification modules are type correct. When the term is not qualified, its semantics are the same as the callable type. > > - Design choices: The main predicates are `valid/2` and `check/3`. These are defined using the predicate `check/2`. Defining clauses for `check/2` instead of `valid/2` gives the user full control of exception terms without requiring an additional predicate. > > - Error context: The built-in execution-context method `context/1` can be used to provide the calling context for errors when using the predicate `check/3`. > > - Registering new types: New types can be registered by defining clauses for the `type/1` and `check/2` multifile predicates. Clauses for both predicates must have a bound first argument to avoid introducing spurious choice-points when type-checking terms. > > - Meta-types: Meta-types are types that have one or more sub-type arguments. E.g. `var_or(Type)`. The sub-types of a meta-type can be enumerated by defining a clause for the `meta_type/3` multifile predicate. > > - Character sets: When testing character or character code based terms (e.g., atom), it is possible to choose a character set (`ascii_identifier`, `ascii_printable`, `ascii_full`, `hexadecimal`, `byte`, `unicode_bmp`, or `unicode_full`) using the parameterizable types. > > - Caveats: The type argument (and any type parameterization) to the predicates is not type-checked (or checked for consistency) for performance reasons. > > - Unicode limitations: Currently, correct character/code type-checking is only ensured for SWI-Prolog and XVM as other backends do not provide support for querying a Unicode code point category. > > - Random seed: When setting the random generator seed using the `set_seed/1` predicate inherited from the `arbitrary` category, the seed must be a valid value for the portable random generator provided by the `random` library. **Inherited public predicates:**  arbitrary/1  arbitrary/2  edge_case/2  get_seed/1  max_size/1  mutation/3  set_seed/1  shrink/3  shrink_sequence/3  shrinker/1 - Public predicates - `type/1` - `meta_type/3` - `valid/2` - `check/3` - `check/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `type/1` Table of defined types. A new type can be registered by defining a clause for this predicate and adding a clause for the `check/2` multifile predicate. **Compilation flags:** `static,`` ``multifile` **Template:** `type(Type)` **Mode and number of proofs:** `type(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `meta_type/3` Table of defined meta-types. A registered type that is a meta-type can be described by defining a clause for this predicate to enumerate its sub-types and optional values in case of a single sub-type. **Compilation flags:** `static,`` ``multifile` **Template:** `meta_type(MetaType,SubTypes,Values)` **Mode and number of proofs:** `meta_type(?callable,-list,-list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `valid/2` True if the given term is of the specified type. Fails otherwise. **Compilation flags:** `static` **Template:** `valid(Type,Term)` **Mode and number of proofs:** `valid(@callable,@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `check/3` True if the given term is of the specified type. Throws an error otherwise using the format `error(Error,`` ``Context)`. For the possible values of `Error` see the `check/2` predicate. **Compilation flags:** `static` **Template:** `check(Type,Term,Context)` **Mode and number of proofs:** `check(@callable,@term,@term)` - `one_or_error` ------------------------------------------------------------------------ ###### `check/2` True if the given term is of the specified type. Throws an error otherwise. A new type can be added by defining a clause for this predicate and registering it by adding a clause for the `type/1` multifile predicate. **Compilation flags:** `static,`` ``multifile` **Template:** `check(Type,Term)` **Meta-predicate template:** `check(::,*)` **Mode and number of proofs:** `check(@callable,@term)` - `one_or_error` **Exceptions:** `Term` is not bound as required: `instantiation_error` `Term` is bound but not of the specified type: `type_error(Type,Term)` `Term` is the of the correct type but not in the specified domain: `domain_error(Domain,Term)` `Term` is the of the correct type and domain but the resource it represents does not exist: `existence_error(Type,Term)` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also arbitrary, os_types, either, maybe **object** #### `varlist` List of variables predicates. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2020-05-11 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` varlistp **Remarks:** (none) **Inherited public predicates:**  append/3  check/1  delete/3  empty/1  flatten/2  last/2  length/2  memberchk/2  nextto/3  nth0/3  nth0/4  nth1/3  nth1/4  permutation/2  prefix/2  remove_duplicates/2  reverse/2  same_length/2  select/3  sublist/2  subtract/3  suffix/2  valid/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also list, list(Type), numberlist, difflist **protocol** #### `varlistp` List of variables protocol. **Availability:** `logtalk_load(types(loader))` **Author:** Paulo Moura **Version:** 1:3:0 **Date:** 2022-09-19 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `append/3` - `delete/3` - `empty/1` - `flatten/2` - `last/2` - `length/2` - `memberchk/2` - `nextto/3` - `nth0/3` - `nth0/4` - `nth1/3` - `nth1/4` - `permutation/2` - `prefix/2` - `remove_duplicates/2` - `reverse/2` - `same_length/2` - `select/3` - `sublist/2` - `subtract/3` - `suffix/2` - `valid/1` - `check/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `append/3` Appends two lists. **Compilation flags:** `static` **Template:** `append(List1,List2,List)` **Mode and number of proofs:** `append(?list,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `delete/3` Deletes from a list all occurrences of an element returning the list of remaining elements. **Compilation flags:** `static` **Template:** `delete(List,Element,Remaining)` **Mode and number of proofs:** `delete(@list,@term,?list)` - `one` ------------------------------------------------------------------------ ###### `empty/1` True if the argument is an empty list. **Compilation flags:** `static` **Template:** `empty(List)` **Mode and number of proofs:** `empty(@list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `flatten/2` Flattens a list of lists into a list. **Compilation flags:** `static` **Template:** `flatten(List,Flatted)` **Mode and number of proofs:** `flatten(@list,-list)` - `one` ------------------------------------------------------------------------ ###### `last/2` List last element (if it exists). **Compilation flags:** `static` **Template:** `last(List,Last)` **Mode and number of proofs:** `last(@list,@var)` - `zero_or_one` ------------------------------------------------------------------------ ###### `length/2` List length. **Compilation flags:** `static` **Template:** `length(List,Length)` **Mode and number of proofs:** `length(@list,?integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `memberchk/2` Checks if a variable is a member of a list. **Compilation flags:** `static` **Template:** `memberchk(Element,List)` **Mode and number of proofs:** `memberchk(@var,@list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `nextto/3` `X` and `Y` are consecutive elements in List. **Compilation flags:** `static` **Template:** `nextto(X,Y,List)` **Mode and number of proofs:** `nextto(@var,@var,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth0/3` Nth element of a list (counting from zero). **Compilation flags:** `static` **Template:** `nth0(Nth,List,Element)` **Mode and number of proofs:** `nth0(?integer,+list,@var)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth0/4` Nth element of a list (counting from zero). `Rest` is a list of all the other elements. Can be used to either select the nth element of `List` or to insert an element before the nth element in `Rest`. **Compilation flags:** `static` **Template:** `nth0(Nth,List,Element,Rest)` **Mode and number of proofs:** `nth0(?integer,+list,@var,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth1/3` Nth element of a list (counting from one). **Compilation flags:** `static` **Template:** `nth1(Nth,List,Element)` **Mode and number of proofs:** `nth1(?integer,+list,@var)` - `zero_or_more` ------------------------------------------------------------------------ ###### `nth1/4` Nth element of a list (counting from zero). `Rest` is a list of all the other elements. Can be used to either select the nth element of `List` or to insert an element before the nth element in `Rest`. **Compilation flags:** `static` **Template:** `nth1(Nth,List,Element,Rest)` **Mode and number of proofs:** `nth1(?integer,+list,@var,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `permutation/2` The two lists are a permutation of the same list. **Compilation flags:** `static` **Template:** `permutation(List,Permutation)` **Mode and number of proofs:** `permutation(@list,@list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `prefix/2` `Prefix` is a prefix of `List`. **Compilation flags:** `static` **Template:** `prefix(Prefix,List)` **Mode and number of proofs:** `prefix(?list,@list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `remove_duplicates/2` Removes duplicated variables and keeping the left-most variable when repeated. **Compilation flags:** `static` **Template:** `remove_duplicates(List,Set)` **Mode and number of proofs:** `remove_duplicates(+list,-list)` - `one` ------------------------------------------------------------------------ ###### `reverse/2` Reverses a list. **Compilation flags:** `static` **Template:** `reverse(List,Reversed)` **Mode and number of proofs:** `reverse(@list,?list)` - `zero_or_one` `reverse(?list,@list)` - `zero_or_one` `reverse(-list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `same_length/2` The two lists have the same length. **Compilation flags:** `static` **Template:** `same_length(List1,List2)` **Mode and number of proofs:** `same_length(@list,?list)` - `zero_or_one` `same_length(?list,@list)` - `zero_or_one` `same_length(-list,-list)` - `one_or_more` ------------------------------------------------------------------------ ###### `select/3` Selects an element from a list, returning the list of remaining elements. **Compilation flags:** `static` **Template:** `select(Element,List,Remaining)` **Mode and number of proofs:** `select(@var,?list,?list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `sublist/2` The first list is a sublist of the second. **Compilation flags:** `static` **Template:** `sublist(Sublist,List)` **Mode and number of proofs:** `sublist(?list,@list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `subtract/3` Removes all elements in the second list from the first list, returning the list of remaining elements. **Compilation flags:** `static` **Template:** `subtract(List,Elements,Remaining)` **Mode and number of proofs:** `subtract(@list,@list,-list)` - `one` ------------------------------------------------------------------------ ###### `suffix/2` `Suffix` is a suffix of `List`. **Compilation flags:** `static` **Template:** `suffix(Suffix,List)` **Mode and number of proofs:** `suffix(?list,@list)` - `zero_or_more` ------------------------------------------------------------------------ ###### `valid/1` Term is a valid list of variables. **Compilation flags:** `static` **Template:** `valid(Term)` **Mode and number of proofs:** `valid(@nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `check/1` Checks if a term is a valid list of variables. Throws an exception if the term is not valid. **Compilation flags:** `static` **Template:** `check(Term)` **Mode and number of proofs:** `check(@nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also varlist, listp, numberlistp ### tzif") **object** #### `tzif` Loader, per-zone cache and snapshot persistence support, and zone-aware UTC lookup predicates for TZif v1/v2/v3 files. **Availability:** `logtalk_load(tzif(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` tzif_protocol **Uses:** date list logtalk os reader tzif_zone_ids **Remarks:** (none) **Inherited public predicates:**  abbreviation/2  abbreviation/3  abbreviation/4  cache/1  cache_source/1  cached_tzif/1  clear_cache/0  daylight_saving_time/2  daylight_saving_time/3  daylight_saving_time/4  load/1  load/2  local_abbreviation/2  local_abbreviation/3  local_abbreviation/4  local_abbreviation_reified/2  local_abbreviation_reified/3  local_abbreviation_reified/4  local_abbreviation_with_resolution/3  local_abbreviation_with_resolution/4  local_abbreviation_with_resolution/5  local_daylight_saving_time/2  local_daylight_saving_time/3  local_daylight_saving_time/4  local_daylight_saving_time_reified/2  local_daylight_saving_time_reified/3  local_daylight_saving_time_reified/4  local_daylight_saving_time_with_resolution/3  local_daylight_saving_time_with_resolution/4  local_daylight_saving_time_with_resolution/5  local_offset/2  local_offset/3  local_offset/4  local_offset_reified/2  local_offset_reified/3  local_offset_reified/4  local_offset_with_resolution/3  local_offset_with_resolution/4  local_offset_with_resolution/5  local_time_type/2  local_time_type/3  local_time_type/4  local_time_type_reified/2  local_time_type_reified/3  local_time_type_reified/4  local_time_type_with_resolution/3  local_time_type_with_resolution/4  local_time_type_with_resolution/5  offset/2  offset/3  offset/4  save/1  save/2  time_type/2  time_type/3  time_type/4  zone/3  zones/1  zones/2 - Public predicates - Protected predicates - Private predicates - `cached_tzif_/2` - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `cached_tzif_/2` Table holding the currently cached TZif terms keyed by zone identifier. **Compilation flags:** `dynamic` **Template:** `cached_tzif_(Zone,TZif)` **Mode and number of proofs:** `cached_tzif_(?atom,?compound)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `tzif_protocol` Protocol for loading TZif data sets, persisting loaded terms, and answering zone-aware UTC-based offset, DST, and abbreviation queries. **Availability:** `logtalk_load(tzif(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-15 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `load/1` - `load/2` - `cache/1` - `save/2` - `save/1` - `clear_cache/0` - `cache_source/1` - `cached_tzif/1` - `zone/3` - `zones/2` - `zones/1` - `time_type/4` - `time_type/3` - `time_type/2` - `offset/4` - `offset/3` - `offset/2` - `daylight_saving_time/4` - `daylight_saving_time/3` - `daylight_saving_time/2` - `abbreviation/4` - `abbreviation/3` - `abbreviation/2` - `local_time_type/4` - `local_time_type/3` - `local_time_type/2` - `local_time_type_with_resolution/5` - `local_time_type_with_resolution/4` - `local_time_type_with_resolution/3` - `local_offset/4` - `local_offset/3` - `local_offset/2` - `local_offset_with_resolution/5` - `local_offset_with_resolution/4` - `local_offset_with_resolution/3` - `local_daylight_saving_time/4` - `local_daylight_saving_time/3` - `local_daylight_saving_time/2` - `local_daylight_saving_time_with_resolution/5` - `local_daylight_saving_time_with_resolution/4` - `local_daylight_saving_time_with_resolution/3` - `local_abbreviation/4` - `local_abbreviation/3` - `local_abbreviation/2` - `local_abbreviation_with_resolution/5` - `local_abbreviation_with_resolution/4` - `local_abbreviation_with_resolution/3` - `local_time_type_reified/4` - `local_time_type_reified/3` - `local_time_type_reified/2` - `local_offset_reified/4` - `local_offset_reified/3` - `local_offset_reified/2` - `local_daylight_saving_time_reified/4` - `local_daylight_saving_time_reified/3` - `local_daylight_saving_time_reified/2` - `local_abbreviation_reified/4` - `local_abbreviation_reified/3` - `local_abbreviation_reified/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `load/1` Loads a TZif source given as `file(Path,`` ``ZoneId)`, `files(Root,`` ``Paths)`, `directory(Root)`, `stream(Stream,`` ``ZoneId)`, `bytes(Bytes,`` ``ZoneId)`, or `snapshot(File)` and caches the resulting per-zone `tzif(...)` terms, replacing cached entries with matching zone identifiers. For `directory(Root)` sources, regular files whose relative paths are not recognized zone identifiers are ignored, allowing system zoneinfo trees that contain metadata files such as `leapseconds`. Zone identifiers are validated against bundled IANA TZDB 2026a canonical names plus backward-compatible aliases. **Compilation flags:** `static` **Template:** `load(Source)` **Mode and number of proofs:** `load(+compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `load/2` Loads a TZif source given as `file(Path,`` ``ZoneId)`, `files(Root,`` ``Paths)`, `directory(Root)`, `stream(Stream,`` ``ZoneId)`, `bytes(Bytes,`` ``ZoneId)`, or `snapshot(File)` into a list of per-zone `tzif(...)` compound terms without caching them. For `directory(Root)` sources, regular files whose relative paths are not recognized zone identifiers are ignored, allowing system zoneinfo trees that contain metadata files such as `leapseconds`. Zone identifiers are validated against bundled IANA TZDB 2026a canonical names plus backward-compatible aliases. **Compilation flags:** `static` **Template:** `load(Source,TZifs)` **Mode and number of proofs:** `load(+compound,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `cache/1` Caches one or more loaded per-zone `tzif(...)` compound terms, replacing cached entries with matching zone identifiers. **Compilation flags:** `static` **Template:** `cache(TZifs)` **Mode and number of proofs:** `cache(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `save/2` Saves a list of per-zone `tzif(...)` terms to a plain Prolog snapshot file, writing one serialized term per line. **Compilation flags:** `static` **Template:** `save(TZifs,File)` **Mode and number of proofs:** `save(+list(compound),+atom)` - `one` ------------------------------------------------------------------------ ###### `save/1` Saves all cached `tzif(...)` terms to a plain Prolog snapshot file. **Compilation flags:** `static` **Template:** `save(File)` **Mode and number of proofs:** `save(+atom)` - `one_or_error` **Exceptions:** No TZif terms are cached: `existence_error(tzif_cache,tzif)` `File` is a variable: `instantiation_error` `File` is neither a variable nor a valid file name atom: `domain_error(file_name,File)` ------------------------------------------------------------------------ ###### `clear_cache/0` Clears all cached TZif terms. **Compilation flags:** `static` **Mode and number of proofs:** `clear_cache` - `one` ------------------------------------------------------------------------ ###### `cache_source/1` Enumerates the source terms recorded in the cached TZif terms. **Compilation flags:** `static` **Template:** `cache_source(Source)` **Mode and number of proofs:** `cache_source(-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `cached_tzif/1` Enumerates the cached per-zone `tzif(...)` terms. **Compilation flags:** `static` **Template:** `cached_tzif(TZif)` **Mode and number of proofs:** `cached_tzif(-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `zone/3` Returns the loaded zone identifier and its nested parsed zone-data term from a per-zone `tzif(...)` term. **Compilation flags:** `static` **Template:** `zone(TZif,Zone,ZoneData)` **Mode and number of proofs:** `zone(+compound,?atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `zones/2` Returns the list of zone identifiers loaded in a list of per-zone `tzif(...)` terms. **Compilation flags:** `static` **Template:** `zones(TZifs,Zones)` **Mode and number of proofs:** `zones(+list(compound),-list(atom))` - `one` ------------------------------------------------------------------------ ###### `zones/1` Returns the list of zone identifiers loaded in the cached `tzif(...)` terms. **Compilation flags:** `static` **Template:** `zones(Zones)` **Mode and number of proofs:** `zones(-list(atom))` - `one_or_error` **Exceptions:** No TZif terms are cached: `existence_error(tzif_cache,tzif)` ------------------------------------------------------------------------ ###### `time_type/4` Returns the applicable local time type for a loaded zone and a UTC instant given either as Unix seconds or as a `date_time/6` term. **Compilation flags:** `static` **Template:** `time_type(TZif,Zone,UTC,TimeType)` **Mode and number of proofs:** `time_type(+compound,+atom,+types([integer,compound]),-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `time_type/3` Returns the applicable local time type for a zone in the cached TZif terms. **Compilation flags:** `static` **Template:** `time_type(Zone,UTC,TimeType)` **Mode and number of proofs:** `time_type(+atom,+types([integer,compound]),-compound)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `time_type/2` Cached single-zone convenience variant of `time_type/3` using the cached TZif terms; requires exactly one cached zone. **Compilation flags:** `static` **Template:** `time_type(UTC,TimeType)` **Mode and number of proofs:** `time_type(+types([integer,compound]),-compound)` - `one_or_error` **Exceptions:** No TZif terms are cached: `existence_error(tzif_cache,tzif)` The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `offset/4` Returns the UTC offset in seconds for a loaded zone and a UTC instant. **Compilation flags:** `static` **Template:** `offset(TZif,Zone,UTC,OffsetSeconds)` **Mode and number of proofs:** `offset(+compound,+atom,+types([integer,compound]),-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `offset/3` Returns the UTC offset in seconds for a zone in the cached TZif terms. **Compilation flags:** `static` **Template:** `offset(Zone,UTC,OffsetSeconds)` **Mode and number of proofs:** `offset(+atom,+types([integer,compound]),-integer)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `offset/2` Cached single-zone convenience variant of `offset/3` using the cached TZif terms; requires exactly one cached zone. **Compilation flags:** `static` **Template:** `offset(UTC,OffsetSeconds)` **Mode and number of proofs:** `offset(+types([integer,compound]),-integer)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `daylight_saving_time/4` Returns `true` or `false` according to whether daylight saving time is active for a loaded zone and a UTC instant. **Compilation flags:** `static` **Template:** `daylight_saving_time(TZif,Zone,UTC,IsDST)` **Mode and number of proofs:** `daylight_saving_time(+compound,+atom,+types([integer,compound]),-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `daylight_saving_time/3` Returns daylight-saving information for a zone in the cached TZif terms. **Compilation flags:** `static` **Template:** `daylight_saving_time(Zone,UTC,IsDST)` **Mode and number of proofs:** `daylight_saving_time(+atom,+types([integer,compound]),-atom)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `daylight_saving_time/2` Cached single-zone convenience variant of `daylight_saving_time/3` using the cached TZif terms; requires exactly one cached zone. **Compilation flags:** `static` **Template:** `daylight_saving_time(UTC,IsDST)` **Mode and number of proofs:** `daylight_saving_time(+types([integer,compound]),-atom)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `abbreviation/4` Returns the time-zone abbreviation for a loaded zone and a UTC instant. **Compilation flags:** `static` **Template:** `abbreviation(TZif,Zone,UTC,Abbreviation)` **Mode and number of proofs:** `abbreviation(+compound,+atom,+types([integer,compound]),-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `abbreviation/3` Returns the time-zone abbreviation for a zone in the cached TZif terms. **Compilation flags:** `static` **Template:** `abbreviation(Zone,UTC,Abbreviation)` **Mode and number of proofs:** `abbreviation(+atom,+types([integer,compound]),-atom)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `abbreviation/2` Cached single-zone convenience variant of `abbreviation/3` using the cached TZif terms; requires exactly one cached zone. **Compilation flags:** `static` **Template:** `abbreviation(UTC,Abbreviation)` **Mode and number of proofs:** `abbreviation(+types([integer,compound]),-atom)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `local_time_type/4` Returns the applicable local time type for a loaded zone and a local civil time given as a `date_time/6` term. This strict variant fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_time_type(TZif,Zone,LocalDateTime,TimeType)` **Mode and number of proofs:** `local_time_type(+compound,+atom,+compound,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ###### `local_time_type/3` Returns the applicable local time type for a zone in the cached TZif terms. This strict variant fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_time_type(Zone,LocalDateTime,TimeType)` **Mode and number of proofs:** `local_time_type(+atom,+compound,-compound)` - `one_or_error` **Exceptions:** `LocalDateTime` is a variable: `instantiation_error` `LocalDateTime` is neither a variable nor a valid `date_time/6` term: `type_error(date_time,LocalDateTime)` `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_time_type/2` Cached single-zone convenience variant of strict local civil-time lookup; requires exactly one cached zone and fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_time_type(LocalDateTime,TimeType)` **Mode and number of proofs:** `local_time_type(+compound,-compound)` - `one_or_error` **Exceptions:** `LocalDateTime` is a variable: `instantiation_error` `LocalDateTime` is neither a variable nor a valid `date_time/6` term: `type_error(date_time,LocalDateTime)` No TZif terms are cached: `existence_error(tzif_cache,tzif)` The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `local_time_type_with_resolution/5` Returns the applicable local time type for a loaded zone and a local civil time using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). **Compilation flags:** `static` **Template:** `local_time_type_with_resolution(TZif,Zone,LocalDateTime,ResolutionMode,TimeType)` **Mode and number of proofs:** `local_time_type_with_resolution(+compound,+atom,+compound,+atom,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_time_type_with_resolution/4` Returns the applicable local time type for a zone in the cached TZif terms using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). **Compilation flags:** `static` **Template:** `local_time_type_with_resolution(Zone,LocalDateTime,ResolutionMode,TimeType)` **Mode and number of proofs:** `local_time_type_with_resolution(+atom,+compound,+atom,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_time_type_with_resolution/3` Cached single-zone convenience variant of local civil-time lookup using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). Requires exactly one cached zone. **Compilation flags:** `static` **Template:** `local_time_type_with_resolution(LocalDateTime,ResolutionMode,TimeType)` **Mode and number of proofs:** `local_time_type_with_resolution(+compound,+atom,-compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_offset/4` Returns the UTC offset in seconds for a loaded zone and a local civil time. This strict variant fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_offset(TZif,Zone,LocalDateTime,OffsetSeconds)` **Mode and number of proofs:** `local_offset(+compound,+atom,+compound,-integer)` - `zero_or_one` ------------------------------------------------------------------------ ###### `local_offset/3` Returns the UTC offset in seconds for a zone in the cached TZif terms. This strict variant fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_offset(Zone,LocalDateTime,OffsetSeconds)` **Mode and number of proofs:** `local_offset(+atom,+compound,-integer)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_offset/2` Cached single-zone convenience variant of strict local civil-time offset lookup. **Compilation flags:** `static` **Template:** `local_offset(LocalDateTime,OffsetSeconds)` **Mode and number of proofs:** `local_offset(+compound,-integer)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `local_offset_with_resolution/5` Returns the UTC offset in seconds for a loaded zone and a local civil time using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). **Compilation flags:** `static` **Template:** `local_offset_with_resolution(TZif,Zone,LocalDateTime,ResolutionMode,OffsetSeconds)` **Mode and number of proofs:** `local_offset_with_resolution(+compound,+atom,+compound,+atom,-integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_offset_with_resolution/4` Returns the UTC offset in seconds for a zone in the cached TZif terms using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). **Compilation flags:** `static` **Template:** `local_offset_with_resolution(Zone,LocalDateTime,ResolutionMode,OffsetSeconds)` **Mode and number of proofs:** `local_offset_with_resolution(+atom,+compound,+atom,-integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_offset_with_resolution/3` Cached single-zone convenience variant of local civil-time offset lookup using the explicit resolution mode; requires exactly one cached zone. **Compilation flags:** `static` **Template:** `local_offset_with_resolution(LocalDateTime,ResolutionMode,OffsetSeconds)` **Mode and number of proofs:** `local_offset_with_resolution(+compound,+atom,-integer)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_daylight_saving_time/4` Returns daylight-saving information for a loaded zone and a local civil time. This strict variant fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_daylight_saving_time(TZif,Zone,LocalDateTime,IsDST)` **Mode and number of proofs:** `local_daylight_saving_time(+compound,+atom,+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `local_daylight_saving_time/3` Returns daylight-saving information for a zone in the cached TZif terms. This strict variant fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_daylight_saving_time(Zone,LocalDateTime,IsDST)` **Mode and number of proofs:** `local_daylight_saving_time(+atom,+compound,-atom)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_daylight_saving_time/2` Cached single-zone convenience variant of strict local daylight-saving lookup. **Compilation flags:** `static` **Template:** `local_daylight_saving_time(LocalDateTime,IsDST)` **Mode and number of proofs:** `local_daylight_saving_time(+compound,-atom)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `local_daylight_saving_time_with_resolution/5` Returns daylight-saving information for a loaded zone and a local civil time using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). **Compilation flags:** `static` **Template:** `local_daylight_saving_time_with_resolution(TZif,Zone,LocalDateTime,ResolutionMode,IsDST)` **Mode and number of proofs:** `local_daylight_saving_time_with_resolution(+compound,+atom,+compound,+atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_daylight_saving_time_with_resolution/4` Returns daylight-saving information for a zone in the cached TZif terms using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). **Compilation flags:** `static` **Template:** `local_daylight_saving_time_with_resolution(Zone,LocalDateTime,ResolutionMode,IsDST)` **Mode and number of proofs:** `local_daylight_saving_time_with_resolution(+atom,+compound,+atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_daylight_saving_time_with_resolution/3` Cached single-zone convenience variant of local civil-time daylight-saving lookup using the explicit resolution mode; requires exactly one cached zone. **Compilation flags:** `static` **Template:** `local_daylight_saving_time_with_resolution(LocalDateTime,ResolutionMode,IsDST)` **Mode and number of proofs:** `local_daylight_saving_time_with_resolution(+compound,+atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_abbreviation/4` Returns the time-zone abbreviation for a loaded zone and a local civil time. This strict variant fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_abbreviation(TZif,Zone,LocalDateTime,Abbreviation)` **Mode and number of proofs:** `local_abbreviation(+compound,+atom,+compound,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `local_abbreviation/3` Returns the time-zone abbreviation for a zone in the cached TZif terms. This strict variant fails unless the local civil time has a unique interpretation. **Compilation flags:** `static` **Template:** `local_abbreviation(Zone,LocalDateTime,Abbreviation)` **Mode and number of proofs:** `local_abbreviation(+atom,+compound,-atom)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_abbreviation/2` Cached single-zone convenience variant of strict local abbreviation lookup. **Compilation flags:** `static` **Template:** `local_abbreviation(LocalDateTime,Abbreviation)` **Mode and number of proofs:** `local_abbreviation(+compound,-atom)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `local_abbreviation_with_resolution/5` Returns the time-zone abbreviation for a loaded zone and a local civil time using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). **Compilation flags:** `static` **Template:** `local_abbreviation_with_resolution(TZif,Zone,LocalDateTime,ResolutionMode,Abbreviation)` **Mode and number of proofs:** `local_abbreviation_with_resolution(+compound,+atom,+compound,+atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_abbreviation_with_resolution/4` Returns the time-zone abbreviation for a zone in the cached TZif terms using the explicit resolution mode: `strict` (fail unless exactly one interpretation exists), `first` (prefer the earliest valid interpretation), `second` (prefer the latest valid interpretation), and `all` (enumerate all valid interpretations in chronological order). **Compilation flags:** `static` **Template:** `local_abbreviation_with_resolution(Zone,LocalDateTime,ResolutionMode,Abbreviation)` **Mode and number of proofs:** `local_abbreviation_with_resolution(+atom,+compound,+atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_abbreviation_with_resolution/3` Cached single-zone convenience variant of local civil-time abbreviation lookup using the explicit resolution mode; requires exactly one cached zone. **Compilation flags:** `static` **Template:** `local_abbreviation_with_resolution(LocalDateTime,ResolutionMode,Abbreviation)` **Mode and number of proofs:** `local_abbreviation_with_resolution(+compound,+atom,-atom)` - `zero_or_more` ------------------------------------------------------------------------ ###### `local_time_type_reified/4` Returns a reified local civil-time lookup result for a loaded zone as one of `unique(TimeType)`, `ambiguous(TimeTypes)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_time_type_reified(TZif,Zone,LocalDateTime,Result)` **Mode and number of proofs:** `local_time_type_reified(+compound,+atom,+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `local_time_type_reified/3` Returns a reified local civil-time lookup result for a zone in the cached TZif terms as one of `unique(TimeType)`, `ambiguous(TimeTypes)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_time_type_reified(Zone,LocalDateTime,Result)` **Mode and number of proofs:** `local_time_type_reified(+atom,+compound,-compound)` - `one_or_error` **Exceptions:** `LocalDateTime` is a variable: `instantiation_error` `LocalDateTime` is neither a variable nor a valid `date_time/6` term: `type_error(date_time,LocalDateTime)` `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_time_type_reified/2` Cached single-zone convenience variant of reified local civil-time lookup; returns `unique(TimeType)`, `ambiguous(TimeTypes)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_time_type_reified(LocalDateTime,Result)` **Mode and number of proofs:** `local_time_type_reified(+compound,-compound)` - `one_or_error` **Exceptions:** `LocalDateTime` is a variable: `instantiation_error` `LocalDateTime` is neither a variable nor a valid `date_time/6` term: `type_error(date_time,LocalDateTime)` No TZif terms are cached: `existence_error(tzif_cache,tzif)` The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `local_offset_reified/4` Returns a reified local offset lookup result for a loaded zone as one of `unique(OffsetSeconds)`, `ambiguous(OffsetSecondsList)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_offset_reified(TZif,Zone,LocalDateTime,Result)` **Mode and number of proofs:** `local_offset_reified(+compound,+atom,+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `local_offset_reified/3` Returns a reified local offset lookup result for a zone in the cached TZif terms as one of `unique(OffsetSeconds)`, `ambiguous(OffsetSecondsList)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_offset_reified(Zone,LocalDateTime,Result)` **Mode and number of proofs:** `local_offset_reified(+atom,+compound,-compound)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_offset_reified/2` Cached single-zone convenience variant of reified local offset lookup; returns `unique(OffsetSeconds)`, `ambiguous(OffsetSecondsList)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_offset_reified(LocalDateTime,Result)` **Mode and number of proofs:** `local_offset_reified(+compound,-compound)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `local_daylight_saving_time_reified/4` Returns a reified local daylight-saving lookup result for a loaded zone as one of `unique(IsDST)`, `ambiguous(IsDSTList)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_daylight_saving_time_reified(TZif,Zone,LocalDateTime,Result)` **Mode and number of proofs:** `local_daylight_saving_time_reified(+compound,+atom,+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `local_daylight_saving_time_reified/3` Returns a reified local daylight-saving lookup result for a zone in the cached TZif terms as one of `unique(IsDST)`, `ambiguous(IsDSTList)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_daylight_saving_time_reified(Zone,LocalDateTime,Result)` **Mode and number of proofs:** `local_daylight_saving_time_reified(+atom,+compound,-compound)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_daylight_saving_time_reified/2` Cached single-zone convenience variant of reified local daylight-saving lookup; returns `unique(IsDST)`, `ambiguous(IsDSTList)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_daylight_saving_time_reified(LocalDateTime,Result)` **Mode and number of proofs:** `local_daylight_saving_time_reified(+compound,-compound)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ###### `local_abbreviation_reified/4` Returns a reified local abbreviation lookup result for a loaded zone as one of `unique(Abbreviation)`, `ambiguous(Abbreviations)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_abbreviation_reified(TZif,Zone,LocalDateTime,Result)` **Mode and number of proofs:** `local_abbreviation_reified(+compound,+atom,+compound,-compound)` - `one` ------------------------------------------------------------------------ ###### `local_abbreviation_reified/3` Returns a reified local abbreviation lookup result for a zone in the cached TZif terms as one of `unique(Abbreviation)`, `ambiguous(Abbreviations)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_abbreviation_reified(Zone,LocalDateTime,Result)` **Mode and number of proofs:** `local_abbreviation_reified(+atom,+compound,-compound)` - `one_or_error` **Exceptions:** `Zone` is not present in the cached TZif terms: `existence_error(time_zone,Zone)` ------------------------------------------------------------------------ ###### `local_abbreviation_reified/2` Cached single-zone convenience variant of reified local abbreviation lookup; returns `unique(Abbreviation)`, `ambiguous(Abbreviations)`, or `nonexistent`. **Compilation flags:** `static` **Template:** `local_abbreviation_reified(LocalDateTime,Result)` **Mode and number of proofs:** `local_abbreviation_reified(+compound,-compound)` - `one_or_error` **Exceptions:** The cached TZif terms do not contain exactly one zone: `domain_error(single_zone_tzif_cache,TZifs)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `tzif_zone_ids` Bundled canonical TZDB zone ids and backward-compatible aliases derived from IANA TZDB 2026a. **Availability:** `logtalk_load(tzif(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-04-07 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `tzdb_version/1` - `known_zone_id/1` - `zone_id_kind/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `tzdb_version/1` Bundled IANA TZDB release used to derive the zone-id table. **Compilation flags:** `static` **Template:** `tzdb_version(Version)` **Mode and number of proofs:** `tzdb_version(-atom)` - `one` ------------------------------------------------------------------------ ###### `known_zone_id/1` True when the argument is a bundled canonical TZDB zone id or backward-compatible alias. **Compilation flags:** `static` **Template:** `known_zone_id(ZoneId)` **Mode and number of proofs:** `known_zone_id(+atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `zone_id_kind/2` Classifies a bundled zone id as canonical or as a backward-compatible alias targeting another zone id. **Compilation flags:** `static` **Template:** `zone_id_kind(ZoneId,Kind)` **Mode and number of proofs:** `zone_id_kind(+atom,-compound)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### ulid") **object** #### `ulid` Universally Unique Lexicographically Sortable Identifier (ULID) generator using an atom representation. **Availability:** `logtalk_load(ulid(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` ulid(atom) **Remarks:** (none) **Inherited public predicates:**  generate/1  generate/2  generate/8  timestamp/2  timestamp/8 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ulid(Representation), ulid_types, cuid2, ids, ksuid, nanoid, snowflakeid, uuid **object** #### `ulid(Representation)` - `Representation` - Text representation for the ULID. Possible values are `atom`, `chars`, and `codes`. Universally Unique Lexicographically Sortable Identifier (ULID) generator. **Availability:** `logtalk_load(ulid(loader))` **Author:** Paulo Moura **Version:** 1:1:2 **Date:** 2026-07-22 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` ulid_protocol **Uses:** crypto date os type **Remarks:** (none) **Inherited public predicates:**  generate/1  generate/2  generate/8  timestamp/2  timestamp/8 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ulid, ulid_types, cuid2(Representation,Size,Alphabet), ids(Representation,Bytes), ksuid(Representation,Alphabet), nanoid(Representation,Size,Alphabet), snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), uuid(Representation) **protocol** #### `ulid_protocol` Universally Unique Lexicographically Sortable Identifier (ULID) generator protocol. **Availability:** `logtalk_load(ulid(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-07-06 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `generate/1` - `generate/2` - `generate/8` - `timestamp/2` - `timestamp/8` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `generate/1` Generates a new ULID. **Compilation flags:** `static` **Template:** `generate(ULID)` **Mode and number of proofs:** `generate(--ulid)` - `one_or_error` **Exceptions:** The representation parameter is a variable: `instantiation_error` The representation parameter is not a variable but also neither `atom`, `chars`, nor `codes`: `domain_error(ulid_representation,Representation)` ------------------------------------------------------------------------ ###### `generate/2` Generates a new ULID from a timestamp (number of milliseconds since the Unix epoch: 00:00:00 UTC on January 1, 1970). **Compilation flags:** `static` **Template:** `generate(Milliseconds,ULID)` **Mode and number of proofs:** `generate(+integer,--ulid)` - `one_or_error` **Exceptions:** The representation parameter is a variable: `instantiation_error` The representation parameter is not a variable but also neither `atom`, `chars`, nor `codes`: `domain_error(ulid_representation,Representation)` `Milliseconds` is a variable: `instantiation_error` `Milliseconds` is neither a variable nor an integer: `type_error(integer,Milliseconds)` `Milliseconds` is outside the 48-bit range required by the ULID specification: `domain_error(ulid_timestamp,Milliseconds)` ------------------------------------------------------------------------ ###### `generate/8` Generates a new ULID from a timestamp discrete components. **Compilation flags:** `static` **Template:** `generate(Year,Month,Day,Hours,Minutes,Seconds,Milliseconds,ULID)` **Mode and number of proofs:** `generate(+integer,+integer,+integer,+integer,+integer,+integer,+integer,--ulid)` - `one_or_error` **Exceptions:** The representation parameter is a variable: `instantiation_error` The representation parameter is not a variable but also neither `atom`, `chars`, nor `codes`: `domain_error(ulid_representation,Representation)` `Milliseconds` is a variable: `instantiation_error` `Milliseconds` is neither a variable nor an integer: `type_error(integer,Milliseconds)` `Milliseconds` is an integer but outside the 0..999 range: `domain_error(ulid_millisecond,Milliseconds)` The timestamp is outside the 48-bit range required by the ULID specification: `domain_error(ulid_timestamp,Timestamp)` ------------------------------------------------------------------------ ###### `timestamp/2` Returns the given ULID timestamp (number of milliseconds since the Unix epoch: 00:00:00 UTC on January 1, 1970). **Compilation flags:** `static` **Template:** `timestamp(ULID,Milliseconds)` **Mode and number of proofs:** `timestamp(++ulid,-integer)` - `one_or_error` **Exceptions:** The representation parameter is a variable: `instantiation_error` The representation parameter is not a variable but also neither `atom`, `chars`, nor `codes`: `domain_error(ulid_representation,Representation)` `ULID` is a variable: `instantiation_error` `ULID` is neither a variable nor an atom when using the `atom` representation: `type_error(atom,ULID)` `ULID` is neither a variable nor a list of characters when using the `chars` representation: `type_error(chars,ULID)` `ULID` is neither a variable nor a list of character codes when using the `codes` representation: `type_error(codes,ULID)` `ULID` is not a valid ULID: `domain_error(ulid,ULID)` ------------------------------------------------------------------------ ###### `timestamp/8` Decodes a ULID into its timestamp discrete components. **Compilation flags:** `static` **Template:** `timestamp(ULID,Year,Month,Day,Hours,Minutes,Seconds,Milliseconds)` **Mode and number of proofs:** `timestamp(++ulid,-integer,-integer,-integer,-integer,-integer,-integer,-integer)` - `one_or_error` **Exceptions:** The representation parameter is a variable: `instantiation_error` The representation parameter is not a variable but also neither `atom`, `chars`, nor `codes`: `domain_error(ulid_representation,Representation)` `ULID` is a variable: `instantiation_error` `ULID` is neither a variable nor an atom when using the `atom` representation: `type_error(atom,ULID)` `ULID` is neither a variable nor a list of characters when using the `chars` representation: `type_error(chars,ULID)` `ULID` is neither a variable nor a list of character codes when using the `codes` representation: `type_error(codes,ULID)` `ULID` is not a valid ULID: `domain_error(ulid,ULID)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **category** #### `ulid_types` ULID type definition. **Availability:** `logtalk_load(ulid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2023-05-19 **Compilation flags:** `static` **Provides:** type::type/1 type::check/2 **Uses:** list type **Remarks:** > - Provided types: This category adds a `ulid(Representation)` type for type-checking when using the `ulid` library object. Valid representation values are `atom`, `chars`, and `codes`. **Inherited public predicates:** (none) - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also ulid(Representation), ulid ### union_find") **object** #### `union_find` Union find data structure implementation. **Availability:** `logtalk_load(union_find(loader))` **Author:** José Antonio Riaza Valverde; adapted to Logtalk by Paulo Moura **Version:** 1:0:0 **Date:** 2022-02-18 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` union_find_protocol **Extends:** `public` compound **Uses:** avltree **Remarks:** (none) **Inherited public predicates:**  (\<)/2  (=:=)/2  (=\<)/2  (=\\)/2  (\>)/2  (\>=)/2  check/1  depth/2  disjoint_sets/2  find/4  find/5  ground/1  make_set/3  new/1  new/2  numbervars/1  numbervars/3  occurs/2  singletons/2  subsumes/2  subterm/2  union/4  union_all/3  valid/1  variables/2  variant/2  varnumbers/2  varnumbers/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `union_find_protocol` Union-find data structure protocol. **Availability:** `logtalk_load(union_find(loader))` **Author:** José Antonio Riaza Valverde; adapted to Logtalk by Paulo Moura **Version:** 1:0:0 **Date:** 2022-02-17 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `new/2` - `make_set/3` - `union/4` - `union_all/3` - `find/4` - `find/5` - `disjoint_sets/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `new/2` Creates a new union-find data structure with a list of elements as keys. **Compilation flags:** `static` **Template:** `new(Elements,UnionFind)` **Mode and number of proofs:** `new(+list(element),?union_find)` - `zero_or_one` ------------------------------------------------------------------------ ###### `make_set/3` Makes a new set by creating a new element with a unique key `Element`, a rank of `0`, and a parent pointer to itself. The parent pointer to itself indicates that the element is the representative member of its own set. **Compilation flags:** `static` **Template:** `make_set(UnionFind,Element,NewUnionFind)` **Mode and number of proofs:** `make_set(+union_find,+element,?union_find)` - `zero_or_one` ------------------------------------------------------------------------ ###### `union/4` Merges the two trees, if distinct, that contain the given elements. The trees are joined by attaching the shorter tree (by rank) to the root of the taller tree. Fails if any of the elements is not found. **Compilation flags:** `static` **Template:** `union(UnionFind,Element1,Element2,NewUnionFind)` **Mode and number of proofs:** `union(+union_find,+element,+element,?union_find)` - `zero_or_one` ------------------------------------------------------------------------ ###### `union_all/3` Merges the distinct trees for all the given elements returning the resulting union-find data structure. Fails if any of the elements is not found. **Compilation flags:** `static` **Template:** `union_all(UnionFind,Elements,NewUnionFind)` **Mode and number of proofs:** `union_all(+union_find,+list(element),?union_find)` - `zero_or_one` ------------------------------------------------------------------------ ###### `find/4` Finds the root element of a set by following the chain of parent pointers from the given element. Root is the representative member of the set to which the element belongs, and may be element itself. Fails if the element is not found. **Compilation flags:** `static` **Template:** `find(UnionFind,Element,Root,NewUnionFind)` **Mode and number of proofs:** `find(+union_find,+element,?element,?union_find)` - `zero_or_one` **Remarks:** > - Path compression: The structure of the tree containing the element is flattened by making every node point to the root whenever this predicate is used on it. ------------------------------------------------------------------------ ###### `find/5` Same as the `find/4` predicate, but returning also the rank of the root. Fails if the element is not found. **Compilation flags:** `static` **Template:** `find(UnionFind,Element,Root,Rank,UnionFindOut)` **Mode and number of proofs:** `find(+union_find,+element,?element,?rank,?union_find)` - `zero_or_one` **Remarks:** > - Path compression: The structure of the tree containing the element is flattened by making every node point to the root whenever this predicate is used on it. ------------------------------------------------------------------------ ###### `disjoint_sets/2` Returns the list of disjoint sets in the given union-find data structure. **Compilation flags:** `static` **Template:** `disjoint_sets(UnionFind,Sets)` **Mode and number of proofs:** `disjoint_sets(+union_find,?sets)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also union_find ### url") **object** #### `url(Representation)` - `Representation` - URL and is components representation. Valid values are `atom`, `codes`, and `chars`. URL validating, parsing, and normalizing predicates following RFC3986 nomenclature. **Availability:** `logtalk_load(url(loader))` **Author:** Paulo Moura **Version:** 2:0:0 **Date:** 2026-05-22 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `valid/1` - `parse/2` - `generate/2` - `parse/3` - `reference_kind/2` - `equivalent/2` - `relativize/3` - `resolve/3` - `normalize/2` - `file_path_components/2` - Protected predicates - Private predicates - `downcase_text/2` - Operators ##### Public predicates ###### `valid/1` True iff the argument is a valid URL, including optional query and fragment components. **Compilation flags:** `static` **Template:** `valid(URL)` **Mode and number of proofs:** `valid(++text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse/2` Parses a URL into a list of its components: `[scheme(Scheme),`` ``authority(Authority),`` ``path(Path),`` ``query(Query),`` ``fragment(Fragment)]`. Fails if the URL is invalid and cannot be parsed. **Compilation flags:** `static` **Template:** `parse(URL,Components)` **Mode and number of proofs:** `parse(++text,-list(compound))` - `zero_or_one` ------------------------------------------------------------------------ ###### `generate/2` Generates a normalized URL or RFC3986 relative reference from a list of components. Component lists headed by `scheme/1` generate absolute URLs; lists without `scheme/1` generate relative references. **Compilation flags:** `static` **Template:** `generate(Components,URL)` **Mode and number of proofs:** `generate(++list(compound),-text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse/3` Parses a URL or RFC3986 relative reference into a list of its components and classifies it as one of `url`, `network_path`, `absolute_path`, `relative_path`, `query`, or `fragment`. **Compilation flags:** `static` **Template:** `parse(Reference,Components,Kind)` **Mode and number of proofs:** `parse(++text,-list(compound),-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `reference_kind/2` Classifies a valid reference as one of `url`, `network_path`, `absolute_path`, `relative_path`, `query`, or `fragment`. **Compilation flags:** `static` **Template:** `reference_kind(Reference,Kind)` **Mode and number of proofs:** `reference_kind(++text,-atom)` - `zero_or_one` ------------------------------------------------------------------------ ###### `equivalent/2` True iff both arguments normalize to the same textual representation under the library normalization rules. **Compilation flags:** `static` **Template:** `equivalent(Reference1,Reference2)` **Mode and number of proofs:** `equivalent(++text,++text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `relativize/3` Relativizes a target absolute hierarchical URL against a base absolute hierarchical URL with the same scheme and authority, returning a non-empty relative reference accepted by the library. Fails when no such non-empty relative reference can be generated. **Compilation flags:** `static` **Template:** `relativize(Base,Target,Relative)` **Mode and number of proofs:** `relativize(++text,++text,-text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `resolve/3` Resolves a reference against a base absolute hierarchical URL and returns a normalized absolute URL. The first argument must be an absolute hierarchical URL suitable for use as a base. The second argument may be either a relative reference or an absolute URL; when it is already absolute, the result is that absolute URL normalized and returned unchanged apart from normalization. **Compilation flags:** `static` **Template:** `resolve(Base,Reference,Resolved)` **Mode and number of proofs:** `resolve(++text,++text,-text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `normalize/2` Normalizes a URL or RFC3986 relative reference by standardizing its components. Normalization includes converting the scheme to lowercase when present, normalizing the authority, percent-encoding characters that require escaping, and simplifying path dot segments while preserving absolute and relative reference forms. **Compilation flags:** `static` **Template:** `normalize(Reference,NormalizedReference)` **Mode and number of proofs:** `normalize(++text,-text)` - `one` ------------------------------------------------------------------------ ###### `file_path_components/2` Converts a file-system path into file URL components represented as `[authority(Authority),`` ``path(Path)]`. Windows drive-letter and UNC paths are normalized to RFC3986-compatible file URL components. **Compilation flags:** `static` **Template:** `file_path_components(FilePath,Components)` **Mode and number of proofs:** `file_path_components(++text,-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `downcase_text/2` Converts text to lowercase (ASCII only). Only uppercase letters A-Z are converted to lowercase. **Compilation flags:** `static` **Template:** `downcase_text(Text,LowerText)` **Mode and number of proofs:** `downcase_text(+text,-text)` - `one` ------------------------------------------------------------------------ ##### Operators (none) ### uuid") **object** #### `uuid` Universally unique identifier (UUID) generator using an atom representation. **Availability:** `logtalk_load(uuid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-26 **Compilation flags:** `static,`` ``context_switching_calls` **Extends:** `public` uuid(atom) **Remarks:** (none) **Inherited public predicates:**  random_node/1  uuid_max/1  uuid_nil/1  uuid_null/1  uuid_v1/2  uuid_v1/3  uuid_v3/3  uuid_v4/1  uuid_v5/3  uuid_v7/1  uuid_v7/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also uuid(Representation), cuid2, ksuid, ids, nanoid, snowflakeid, ulid **object** #### `uuid(Representation)` - `Representation` - Text representation for the UUID. Possible values are `atom`, `chars`, and `codes`. Universally unique identifier (UUID) generator. **Availability:** `logtalk_load(uuid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` uuid_protocol **Uses:** crypto date iso8601 list os **Remarks:** (none) **Inherited public predicates:**  random_node/1  uuid_max/1  uuid_nil/1  uuid_null/1  uuid_v1/2  uuid_v1/3  uuid_v3/3  uuid_v4/1  uuid_v5/3  uuid_v7/1  uuid_v7/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also uuid, cuid2(Representation,Size,Alphabet), ksuid(Representation,Alphabet), ids(Representation,Bytes), nanoid(Representation,Size,Alphabet), snowflakeid(Representation,EpochMilliseconds,TimeUnitMilliseconds,TimestampBits,NodeBits,SequenceBits,Node), ulid(Representation) **protocol** #### `uuid_protocol` Universally unique identifier (UUID) generator protocol. **Availability:** `logtalk_load(uuid(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-07-06 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `uuid_v1/2` - `uuid_v1/3` - `uuid_v3/3` - `uuid_v4/1` - `uuid_v5/3` - `uuid_v7/1` - `uuid_v7/2` - `uuid_null/1` - `uuid_nil/1` - `uuid_max/1` - `random_node/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `uuid_v1/2` Returns a version 1 UUID for the given MAC address (a list of six bytes). The MAC address can be replaced by a random 6 bytes node identifier as per RFC 4122 when the MAC address is not available or should not be disclosed. Portability note: some backends only provide access to local time; use `uuid_v1/3` with an explicit UTC offset when a UTC timestamp is required. **Compilation flags:** `static` **Template:** `uuid_v1(MAC,UUID)` **Mode and number of proofs:** `uuid_v1(+list(byte),--text)` - `one` ------------------------------------------------------------------------ ###### `uuid_v1/3` Returns a version 1 UUID for the given MAC address (a list of six bytes) using the given local UTC offset (`Z` or `+HH:MM`/`-HH:MM`) to convert the backend local time to UTC. The MAC address can be replaced by a random 6 bytes node identifier as per RFC 4122 when the MAC address is not available or should not be disclosed. **Compilation flags:** `static` **Template:** `uuid_v1(MAC,Offset,UUID)` **Mode and number of proofs:** `uuid_v1(+list(byte),+atom,--text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `uuid_v3/3` Returns a version 3 UUID for the given namespace UUID and name. Namespace UUIDs and names can be represented as atoms, lists of characters, or lists of character codes. Name character codes must be bytes. **Compilation flags:** `static` **Template:** `uuid_v3(Namespace,Name,UUID)` **Mode and number of proofs:** `uuid_v3(+text,+text,--text)` - `one` ------------------------------------------------------------------------ ###### `uuid_v4/1` Returns a version 4 UUID. **Compilation flags:** `static` **Template:** `uuid_v4(UUID)` **Mode and number of proofs:** `uuid_v4(--text)` - `one` ------------------------------------------------------------------------ ###### `uuid_v5/3` Returns a version 5 UUID for the given namespace UUID and name. Namespace UUIDs and names can be represented as atoms, lists of characters, or lists of character codes. Name character codes must be bytes. **Compilation flags:** `static` **Template:** `uuid_v5(Namespace,Name,UUID)` **Mode and number of proofs:** `uuid_v5(+text,+text,--text)` - `one` ------------------------------------------------------------------------ ###### `uuid_v7/1` Returns a version 7 UUID. Portability note: some backends only provide access to local time; use `uuid_v7/2` with an explicit UTC offset when a UTC timestamp is required. **Compilation flags:** `static` **Template:** `uuid_v7(UUID)` **Mode and number of proofs:** `uuid_v7(--text)` - `one` ------------------------------------------------------------------------ ###### `uuid_v7/2` Returns a version 7 UUID using the given local UTC offset (`Z` or `+HH:MM`/`-HH:MM`) to convert the backend local time to UTC. **Compilation flags:** `static` **Template:** `uuid_v7(Offset,UUID)` **Mode and number of proofs:** `uuid_v7(+atom,--text)` - `zero_or_one` ------------------------------------------------------------------------ ###### `uuid_null/1` Returns the null UUID. Deprecated. Use `uuid_nil/1` instead. **Compilation flags:** `static` **Template:** `uuid_null(UUID)` **Mode and number of proofs:** `uuid_null(--text)` - `one` ------------------------------------------------------------------------ ###### `uuid_nil/1` Returns the Nil UUID. **Compilation flags:** `static` **Template:** `uuid_nil(UUID)` **Mode and number of proofs:** `uuid_nil(--text)` - `one` ------------------------------------------------------------------------ ###### `uuid_max/1` Returns the Max UUID. **Compilation flags:** `static` **Template:** `uuid_max(UUID)` **Mode and number of proofs:** `uuid_max(--text)` - `one` ------------------------------------------------------------------------ ###### `random_node/1` Generates a list with six random bytes that can be used in alternative to a MAC address when generating version 1 UUIDs. **Compilation flags:** `static` **Template:** `random_node(Node)` **Mode and number of proofs:** `random_node(--list(byte))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### validations") **object** #### `validated` Types and predicates for type-checking and handling lists of validation terms. Inspired by Scala Cats and Kotlin Arrow. **Availability:** `logtalk_load(validations(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-02-22 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** type::type/1 type::check/2 arbitrary::arbitrary/1 arbitrary::arbitrary/2 arbitrary::shrinker/1 arbitrary::shrink/3 arbitrary::edge_case/2 **Uses:** list random type **Remarks:** > - Type-checking support: Defines a `validated(ValueType,`` ``ErrorType)` type for checking validation terms where the value and error terms must be of the given types. > > - QuickCheck support: Defines clauses for the `type::arbitrary/1-2`, `arbitrary::shrinker/1`, `arbitrary::shrink/3`, and `arbitrary::edge_case/2` predicates to allow generating random values for the `validated(ValueType,`` ``ErrorType)` type. **Inherited public predicates:** (none) - Public predicates - `valids/2` - `invalids/2` - `partition/3` - `map/3` - `map/4` - `sequence/2` - `traverse/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `valids/2` Returns the values stored in validation terms that hold valid values. **Compilation flags:** `static` **Template:** `valids(Validations,Values)` **Mode and number of proofs:** `valids(+list(validation),-list)` - `one` ------------------------------------------------------------------------ ###### `invalids/2` Returns a flattened list with all errors stored in invalid validation terms. **Compilation flags:** `static` **Template:** `invalids(Validations,Errors)` **Mode and number of proofs:** `invalids(+list(validation),-list)` - `one` ------------------------------------------------------------------------ ###### `partition/3` Retrieves and partitions valid values and flattened accumulated errors from validation terms. **Compilation flags:** `static` **Template:** `partition(Validations,Values,Errors)` **Mode and number of proofs:** `partition(+list(validation),-list,-list)` - `one` ------------------------------------------------------------------------ ###### `map/3` Applies a closure to each list element to generate validation terms and returns a pair `Values-Errors` accumulating all valid values and all errors in one pass. **Compilation flags:** `static` **Template:** `map(Closure,Terms,ValuesErrors)` **Meta-predicate template:** `map(2,*,*)` **Mode and number of proofs:** `map(+callable,+list,--compound)` - `one` ------------------------------------------------------------------------ ###### `map/4` Applies a closure to each list element to generate validation terms and returns valid values and accumulated errors in one pass. **Compilation flags:** `static` **Template:** `map(Closure,Terms,Values,Errors)` **Meta-predicate template:** `map(2,*,*,*)` **Mode and number of proofs:** `map(+callable,+list,-list,-list)` - `one` ------------------------------------------------------------------------ ###### `sequence/2` Sequences a list of validation terms into a single validation term, accumulating all errors. **Compilation flags:** `static` **Template:** `sequence(Validations,Validation)` **Mode and number of proofs:** `sequence(+list(validation),--nonvar)` - `one` ------------------------------------------------------------------------ ###### `traverse/3` Applies a closure to each list element to generate validation terms and then sequences them, accumulating all errors. **Compilation flags:** `static` **Template:** `traverse(Closure,Terms,Validation)` **Meta-predicate template:** `traverse(2,*,*)` **Mode and number of proofs:** `traverse(+callable,+list,--nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also validation, validation(Validation), type, arbitrary **object** #### `validation` Constructors for validation terms. A validation term is either `valid(Value)` or `invalid(Errors)` where `Errors` is a list of errors. Validation terms allow applicative-style error accumulation. **Availability:** `logtalk_load(validations(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-04-22 **Compilation flags:** `static,`` ``context_switching_calls` **Provides:** type::type/1 type::check/2 **Uses:** type **Remarks:** > - Type-checking support: Defines a `validation` type for use with the `type` library object. **Inherited public predicates:** (none) - Public predicates - `of_valid/2` - `of_invalid/2` - `of_invalids/2` - `from_goal/4` - `from_goal/3` - `from_goal/2` - `from_generator/4` - `from_generator/3` - `from_generator/2` - `from_optional/3` - `from_expected/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `of_valid/2` Constructs a validation term holding a valid value. **Compilation flags:** `static` **Template:** `of_valid(Value,Validation)` **Mode and number of proofs:** `of_valid(@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `of_invalid/2` Constructs a validation term holding a single error. **Compilation flags:** `static` **Template:** `of_invalid(Error,Validation)` **Mode and number of proofs:** `of_invalid(@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `of_invalids/2` Constructs a validation term holding a list of errors. **Compilation flags:** `static` **Template:** `of_invalids(Errors,Validation)` **Mode and number of proofs:** `of_invalids(@list,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_goal/4` Constructs a validation term holding a value bound by calling the given goal. Otherwise returns a validation term with a single error represented by the `Error` argument. **Compilation flags:** `static` **Template:** `from_goal(Goal,Value,Error,Validation)` **Meta-predicate template:** `from_goal(0,*,*,*)` **Mode and number of proofs:** `from_goal(+callable,--term,@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_goal/3` Constructs a validation term holding a value bound by calling the given goal. Otherwise returns a validation term with a single error being the goal error or the atom `fail` representing goal failure. **Compilation flags:** `static` **Template:** `from_goal(Goal,Value,Validation)` **Meta-predicate template:** `from_goal(0,*,*)` **Mode and number of proofs:** `from_goal(+callable,--term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_goal/2` Constructs a validation term holding a value bound by calling the given closure. Otherwise returns a validation term with a single error being the closure error or the atom `fail` representing closure failure. **Compilation flags:** `static` **Template:** `from_goal(Closure,Validation)` **Meta-predicate template:** `from_goal(1,*)` **Mode and number of proofs:** `from_goal(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_generator/4` Constructs validation terms with the values generated by calling the given goal. On goal error or failure, returns a validation term with a single error represented by the `Error` argument. **Compilation flags:** `static` **Template:** `from_generator(Goal,Value,Error,Validation)` **Meta-predicate template:** `from_generator(0,*,*,*)` **Mode and number of proofs:** `from_generator(+callable,--term,@term,--nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `from_generator/3` Constructs validation terms with the values generated by calling the given goal. On goal error or failure, returns a validation term with, respectively, a single error being the goal error or the atom `fail` representing goal failure. **Compilation flags:** `static` **Template:** `from_generator(Goal,Value,Validation)` **Meta-predicate template:** `from_generator(0,*,*)` **Mode and number of proofs:** `from_generator(+callable,--term,--nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `from_generator/2` Constructs validation terms with the values generated by calling the given closure. On closure error or failure, returns a validation term with, respectively, a single error being the closure error or the atom `fail` representing closure failure. **Compilation flags:** `static` **Template:** `from_generator(Closure,Validation)` **Meta-predicate template:** `from_generator(1,*)` **Mode and number of proofs:** `from_generator(+callable,--nonvar)` - `one_or_more` ------------------------------------------------------------------------ ###### `from_optional/3` Converts an optional term to a validation term. Returns a valid term holding the value if the optional term is not empty. Returns an invalid term with the given error otherwise. **Compilation flags:** `static` **Template:** `from_optional(Optional,Error,Validation)` **Mode and number of proofs:** `from_optional(+nonvar,@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `from_expected/2` Converts an expected term to a validation term. Returns a valid term holding the value if the expected term holds a value. Returns an invalid term with the expected term error otherwise. **Compilation flags:** `static` **Template:** `from_expected(Expected,Validation)` **Mode and number of proofs:** `from_expected(+nonvar,--nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also validation(Validation), validated, type, arbitrary **object** #### `validation(Validation)` Validation term predicates. Requires passing a validation term (constructed using the `validation` object predicates) as a parameter. **Availability:** `logtalk_load(validations(loader))` **Author:** Paulo Moura **Version:** 0:2:0 **Date:** 2026-02-21 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `is_valid/0` - `is_invalid/0` - `if_valid/1` - `if_invalid/1` - `if_valid_or_else/2` - `valid/1` - `invalid/1` - `filter/3` - `map/2` - `flat_map/2` - `map_or_else/3` - `map_catching/2` - `map_invalid/2` - `map_both/3` - `swap/1` - `or/2` - `or_else/2` - `or_else_get/2` - `or_else_call/2` - `or_else_fail/1` - `or_else_throw/1` - `or_else_throw/2` - `zip/3` - `flatten/1` - `to_optional/1` - `to_expected/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `is_valid/0` True if the validation term holds a valid value. **Compilation flags:** `static` **Mode and number of proofs:** `is_valid` - `zero_or_one` ------------------------------------------------------------------------ ###### `is_invalid/0` True if the validation term holds one or more errors. **Compilation flags:** `static` **Mode and number of proofs:** `is_invalid` - `zero_or_one` ------------------------------------------------------------------------ ###### `if_valid/1` Applies a closure when the validation term holds a valid value using the value as argument. Succeeds otherwise. **Compilation flags:** `static` **Template:** `if_valid(Closure)` **Meta-predicate template:** `if_valid(1)` **Mode and number of proofs:** `if_valid(+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `if_invalid/1` Applies a closure when the validation term holds errors using the errors list as argument. Succeeds otherwise. **Compilation flags:** `static` **Template:** `if_invalid(Closure)` **Meta-predicate template:** `if_invalid(1)` **Mode and number of proofs:** `if_invalid(+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `if_valid_or_else/2` Applies either `ValidClosure` or `InvalidClosure` depending on the validation term holding a value or errors. **Compilation flags:** `static` **Template:** `if_valid_or_else(ValidClosure,InvalidClosure)` **Meta-predicate template:** `if_valid_or_else(1,1)` **Mode and number of proofs:** `if_valid_or_else(+callable,+callable)` - `zero_or_more` ------------------------------------------------------------------------ ###### `valid/1` Returns the value hold by the validation term. Throws an error otherwise. **Compilation flags:** `static` **Template:** `valid(Value)` **Mode and number of proofs:** `valid(--term)` - `one_or_error` **Exceptions:** Validation term holds errors: `existence_error(valid_value,Validation)` ------------------------------------------------------------------------ ###### `invalid/1` Returns the errors hold by the validation term. Throws an error otherwise. **Compilation flags:** `static` **Template:** `invalid(Errors)` **Mode and number of proofs:** `invalid(--list)` - `one_or_error` **Exceptions:** Validation term holds a valid value: `existence_error(validation_errors,Validation)` ------------------------------------------------------------------------ ###### `filter/3` When the validation term holds a value and the value satisfies the closure, returns the same validation term. When the validation term holds a value that does not satisfy the closure, returns an invalid term with the given error. When the validation term holds errors, returns the same validation term. **Compilation flags:** `static` **Template:** `filter(Closure,Error,NewValidation)` **Meta-predicate template:** `filter(1,*,*)` **Mode and number of proofs:** `filter(+callable,@term,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map/2` When the validation term holds a valid value and mapping a closure with the value and the new value as additional arguments succeeds, returns a new valid term. Otherwise returns the same validation term. **Compilation flags:** `static` **Template:** `map(Closure,NewValidation)` **Meta-predicate template:** `map(2,*)` **Mode and number of proofs:** `map(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `flat_map/2` When the validation term holds a valid value, applies a closure with the value and the new validation term as additional arguments. Returns the new validation term on success. When the validation term holds errors, short-circuits by returning the same validation term without calling the closure. This is the monadic escape hatch for dependent steps; use `zip/3`, `sequence/2`, or `traverse/3` for error accumulation on independent steps. **Compilation flags:** `static` **Template:** `flat_map(Closure,NewValidation)` **Meta-predicate template:** `flat_map(2,*)` **Mode and number of proofs:** `flat_map(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map_or_else/3` When the validation term holds a value and mapping a closure with the value and the new value as additional arguments is successful, returns the new value. Otherwise returns the given default value. **Compilation flags:** `static` **Template:** `map_or_else(Closure,Default,Value)` **Meta-predicate template:** `map_or_else(2,*,*)` **Mode and number of proofs:** `map_or_else(+callable,@term,--term)` - `one` ------------------------------------------------------------------------ ###### `map_catching/2` When the validation term holds a value, applies a closure to it. Returns a valid term with the new value if the closure succeeds. Returns an invalid term with the error if the closure throws an error. Returns an invalid term with the atom `fail` as error if the closure fails. When the validation term holds errors, returns the same validation term. **Compilation flags:** `static` **Template:** `map_catching(Closure,NewValidation)` **Meta-predicate template:** `map_catching(2,*)` **Mode and number of proofs:** `map_catching(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map_invalid/2` When the validation term holds errors and mapping a closure with the errors list and the new errors list as additional arguments succeeds, returns a new invalid term. Otherwise returns the same validation term. **Compilation flags:** `static` **Template:** `map_invalid(Closure,NewValidation)` **Meta-predicate template:** `map_invalid(2,*)` **Mode and number of proofs:** `map_invalid(+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `map_both/3` When the validation term holds a value and mapping `ValidClosure` with the value is successful, returns a valid term with the new value. When the validation term holds errors and mapping `InvalidClosure` with the errors list is successful, returns an invalid term with the new errors. Otherwise returns the same validation term. **Compilation flags:** `static` **Template:** `map_both(ValidClosure,InvalidClosure,NewValidation)` **Meta-predicate template:** `map_both(2,2,*)` **Mode and number of proofs:** `map_both(+callable,+callable,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `swap/1` Swaps the valid and invalid terms. If the validation term holds a value, returns an invalid term with a singleton list containing that value. If the validation term holds errors, returns a valid term with the errors list. **Compilation flags:** `static` **Template:** `swap(NewValidation)` **Mode and number of proofs:** `swap(--nonvar)` - `one` ------------------------------------------------------------------------ ###### `or/2` Returns the same validation term if it holds a value. Otherwise calls closure to generate a new validation term. Fails if the validation term holds errors and calling the closure fails or throws an error. **Compilation flags:** `static` **Template:** `or(NewValidation,Closure)` **Meta-predicate template:** `or(*,1)` **Mode and number of proofs:** `or(--term,@callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `or_else/2` Returns the valid value if present or the default value otherwise. **Compilation flags:** `static` **Template:** `or_else(Value,Default)` **Mode and number of proofs:** `or_else(--term,@term)` - `one` ------------------------------------------------------------------------ ###### `or_else_get/2` Returns the value hold by the validation term if valid. Otherwise applies a closure to compute the value. Throws an error when the validation term holds errors and a value cannot be computed. **Compilation flags:** `static` **Template:** `or_else_get(Value,Closure)` **Meta-predicate template:** `or_else_get(*,1)` **Mode and number of proofs:** `or_else_get(--term,+callable)` - `one_or_error` **Exceptions:** Validation term holds errors and a value cannot be computed: `existence_error(valid_value,Validation)` ------------------------------------------------------------------------ ###### `or_else_call/2` Returns the value hold by the validation term if valid. Calls a goal deterministically otherwise. **Compilation flags:** `static` **Template:** `or_else_call(Value,Goal)` **Meta-predicate template:** `or_else_call(*,0)` **Mode and number of proofs:** `or_else_call(--term,+callable)` - `zero_or_one` ------------------------------------------------------------------------ ###### `or_else_fail/1` Returns the valid value if present. Fails otherwise. **Compilation flags:** `static` **Template:** `or_else_fail(Value)` **Mode and number of proofs:** `or_else_fail(--term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `or_else_throw/1` Returns the value hold by the validation term if valid. Throws the errors list hold by the validation term as an exception otherwise. **Compilation flags:** `static` **Template:** `or_else_throw(Value)` **Mode and number of proofs:** `or_else_throw(--term)` - `one_or_error` ------------------------------------------------------------------------ ###### `or_else_throw/2` Returns the value hold by the validation term if valid. Throws the given error otherwise, ignoring any errors hold by the validation term. **Compilation flags:** `static` **Template:** `or_else_throw(Value,Error)` **Mode and number of proofs:** `or_else_throw(--term,@nonvar)` - `one_or_error` ------------------------------------------------------------------------ ###### `zip/3` When both this validation and the other validation hold values and applying a closure with both values and the new value as additional arguments is successful, returns a valid term with the new value. When both hold errors, returns an invalid term with all errors accumulated. Otherwise returns the first invalid term. **Compilation flags:** `static` **Template:** `zip(Closure,OtherValidation,NewValidation)` **Meta-predicate template:** `zip(3,*,*)` **Mode and number of proofs:** `zip(+callable,+nonvar,--nonvar)` - `one` ------------------------------------------------------------------------ ###### `flatten/1` Flattens a nested validation term. When the validation term holds a value that is itself a validation term, returns the inner validation term. When the validation term holds a non-validation value, returns the same validation term. When the validation term holds errors, returns the same validation term. **Compilation flags:** `static` **Template:** `flatten(NewValidation)` **Mode and number of proofs:** `flatten(--nonvar)` - `one` ------------------------------------------------------------------------ ###### `to_optional/1` Converts the validation term to an optional term. Returns a non-empty optional term holding the value if the validation term holds a value. Returns an empty optional term if the validation term holds errors. **Compilation flags:** `static` **Template:** `to_optional(Optional)` **Mode and number of proofs:** `to_optional(--nonvar)` - `one` ------------------------------------------------------------------------ ###### `to_expected/1` Converts the validation term to an expected term. Returns an expected term holding the value if the validation term holds a value. Returns an expected term with the errors list as the unexpected error otherwise. **Compilation flags:** `static` **Template:** `to_expected(Expected)` **Mode and number of proofs:** `to_expected(--nonvar)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also validation, validated ### verdi_neruda") **object** #### `a_star_interpreter(W)` A\* interpreter for general logic programs. The parameter W is used to fine tune the behavior. W = 0 gives us a breadth-first search and W = 1 gives us a greedy best-first search. The default value for W is 0.5. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:0 **Date:** 2010-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` best_first **Remarks:** (none) **Inherited public predicates:**  prove/2  prove/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `benchmark_generators` Generates random data structures for use in benchmarks. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:0 **Date:** 2010-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** random **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `random_tree/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `random_tree/1` Generates a random tree. **Compilation flags:** `static` **Template:** `random_tree(Tree)` **Mode and number of proofs:** `random_tree(-tree)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `best_first` Best-first framework for general logic programs. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:1:1 **Date:** 2026-01-28 **Compilation flags:** `static` **Implements:** `public` interpreterp **Uses:** counter pairing_heap(Order) **Remarks:** (none) **Inherited public predicates:**  prove/2  prove/3 - Public predicates - Protected predicates - `f/4` - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates ###### `f/4` . **Compilation flags:** `static` **Template:** `f(Length1,Length2,Depth,Cost)` **Mode and number of proofs:** `f(+float,+float,+float,-float)` - `zero_or_more` ------------------------------------------------------------------------ ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `bfs_interpreter` Breadth-first interpreter for general logic programs. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:0 **Date:** 2010-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` interpreterp **Uses:** counter queue **Remarks:** (none) **Inherited public predicates:**  prove/2  prove/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `bup_interpreter` Semi-naive bottom-up interpreter for general (stratified) logic programs. Magic transformation is realized through an expansion hook. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Ulf Nilsson. Ported to Logtalk and augmented with negation by Victor Lagerkvist. **Version:** 1:1:3 **Date:** 2023-11-30 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` interpreterp **Uses:** counter list magic term **Remarks:** (none) **Inherited public predicates:**  prove/2  prove/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `counter` Counter implemented with asserta/retract. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:1 **Date:** 2022-10-08 **Compilation flags:** `static,`` ``context_switching_calls` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `increment/0` - `increase/1` - `set/1` - `value/1` - `reset/0` - Protected predicates - Private predicates - `c/1` - Operators ##### Public predicates ###### `increment/0` Increment the counter by 1. **Compilation flags:** `static` **Mode and number of proofs:** `increment` - `one` ------------------------------------------------------------------------ ###### `increase/1` Increments the counter by the specified amount. **Compilation flags:** `static` **Template:** `increase(I)` **Mode and number of proofs:** `increase(+number)` - `one` ------------------------------------------------------------------------ ###### `set/1` Sets the counter to the specified amount. **Compilation flags:** `static` **Template:** `set(N)` **Mode and number of proofs:** `set(+number)` - `one` ------------------------------------------------------------------------ ###### `value/1` Gets the current value of the counter. **Compilation flags:** `static` **Template:** `value(N)` **Mode and number of proofs:** `value(?number)` - `one` ------------------------------------------------------------------------ ###### `reset/0` Resets the counter to zero. **Compilation flags:** `static` **Mode and number of proofs:** `reset` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates ###### `c/1` Stores the current value of the counter. **Compilation flags:** `dynamic` **Template:** `c(N)` **Mode and number of proofs:** `c(?number)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) **protocol** #### `databasep` Database protocol. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:0 **Date:** 2010-06-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `rule/4` - `rule/3` - `rule/2` - `bench_goal/1` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `rule/4` Clauses for this predicate are automatically generated using term-expansion. The third argument contains the length of Body. **Compilation flags:** `static` **Template:** `rule(Head,Body,Length,Tail)` **Mode and number of proofs:** `rule(?callable,?callable,-,-)` - `zero_or_more` ------------------------------------------------------------------------ ###### `rule/3` Clauses for this predicate are automatically generated using term-expansion. The third argument denotes the tail of the Body. **Compilation flags:** `static` **Template:** `rule(Head,Body,Tail)` **Mode and number of proofs:** `rule(?callable,?callable,-)` - `zero_or_more` ------------------------------------------------------------------------ ###### `rule/2` Clauses for this predicate are automatically generated using term-expansion. **Compilation flags:** `static` **Template:** `rule(Head,Body)` **Mode and number of proofs:** `rule(?callable,-list(callable))` - `zero_or_more` ------------------------------------------------------------------------ ###### `bench_goal/1` Table of benchmark goals. They are used from shell.lgt to make benchmarking easier. **Compilation flags:** `static` **Template:** `bench_goal(Goal)` **Mode and number of proofs:** `bench_goal(?callable)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `debug_expansion(Mode)` Expands debug/1 calls. The parameter Mode can be either the atom “debug” or “production”. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2010-04-15 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `demodb` **Availability:** `logtalk_load(verdi_neruda(loader))` **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` databasep **Remarks:** (none) **Inherited public predicates:**  bench_goal/1  rule/2  rule/3  rule/4 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `dfs_interpreter` Depth-first interpreter for general logic programs. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:0 **Date:** 2010-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` interpreterp **Uses:** counter **Remarks:** (none) **Inherited public predicates:**  prove/2  prove/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **category** #### `flatting` Flattens conjunction of goals with the form f and g into a list \[f,g\]. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:1:0 **Date:** 2025-10-06 **Compilation flags:** `static` **source:** Based on source code from The Craft of Prolog, by Richard O’Keefe. **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - Protected predicates - `flatten_goals//1` - Private predicates - Operators ##### Public predicates (none) ##### Protected predicates ###### `flatten_goals//1` Flattens a conjunction of goals. **Compilation flags:** `static` **Template:** `flatten_goals(Conjunction)` **Mode and number of proofs:** `flatten_goals(+callable)` - `one` ------------------------------------------------------------------------ ##### Private predicates (none) ##### Operators (none) **object** #### `heuristic_expansion(Mode)` Expands rules of the form p if f and g to rule(p, \[f,g\|Tail\], Length, Tail). **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:2 **Date:** 2022-10-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Extends:** `public` rule_expansion(Mode) **Uses:** list **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `iddfs_interpreter(Increment)` Iterative deepening depth-first interpreter for general logic programs. Based on source code from The Craft of Prolog, by Richard O’Keefe. The default value for the increment is 1. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:0 **Date:** 2010-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` interpreterp **Uses:** counter dfs_interpreter **Remarks:** (none) **Inherited public predicates:**  prove/2  prove/3 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `interpreterp` Protocol for an interpreter. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:0 **Date:** 2010-06-13 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `prove/2` - `prove/3` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `prove/2` True if goal is provable in the specified database. **Compilation flags:** `static` **Template:** `prove(Goal,DB)` **Mode and number of proofs:** `prove(+goal,+database)` - `zero_or_more` ------------------------------------------------------------------------ ###### `prove/3` True if goal is provable within the given depth-limit in the specified database. **Compilation flags:** `static` **Template:** `prove(Goal,Limit,DB)` **Mode and number of proofs:** `prove(+goal,+limit,+database)` - `zero_or_more` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) **object** #### `magic` Object encapsulating magic methods. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Ulf Nilsson. Ported to Logtalk and augmented with stratified negation by Victor Lagerkvist. **Version:** 1:0:0 **Date:** 2010-06-13 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `magicise/4` - `magic/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `magicise/4` Transform (Head :- Body) into a magic clause (NewHead :- NewBody). **Compilation flags:** `static` **Template:** `magicise(Head,Body,NewHead,NewBody)` **Mode and number of proofs:** `magicise(+term,+list,-term,-list)` - `zero_or_one` ------------------------------------------------------------------------ ###### `magic/2` Prefix the predicate symbol of Old with magic. **Compilation flags:** `static` **Template:** `magic(Old,New)` **Mode and number of proofs:** `magic(+callable,-callable)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `magic_expansion(Mode)` Expands rules of the form p if f and g to the more manageable rule(p, \[f,g\]) and performs magic transformation of clauses. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:2 **Date:** 2022-10-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Imports:** `public` flatting **Extends:** `public` debug_expansion(Mode) **Uses:** list magic **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `rule_expansion(Mode)` Expands rules of the form p if f and g to the more manageable rule(p, \[f,g\]). **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:2 **Date:** 2022-10-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Imports:** `public` flatting **Extends:** `public` debug_expansion(Mode) **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `shell` User frontend to start the application. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2019-03-20 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** shell(Interpreters) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `welcome/0` - `start/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `welcome/0` **Compilation flags:** `static` ------------------------------------------------------------------------ ###### `start/0` **Compilation flags:** `static` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `shell(Interpreters)` Prolog shell for the interpreters. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist and Paulo Moura **Version:** 1:1:3 **Date:** 2024-03-15 **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** counter list meta pairs **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `init/0` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `init/0` **Compilation flags:** `static` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **object** #### `shell_expansion(Mode)` Expansion object for the shell. **Availability:** `logtalk_load(verdi_neruda(loader))` **Author:** Victor Lagerkvist **Version:** 1:0:1 **Date:** 2022-10-08 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Extends:** `public` rule_expansion(Mode) **Remarks:** (none) **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ### wkt_wkb") **object** #### `wkt_wkb` Well-Known Text (WKT) and Well-Known Binary (WKB) geometry parser, generator, and validator. **Availability:** `logtalk_load(wkt_wkb(loader))` **Author:** Paulo Moura **Version:** 1:1:1 **Date:** 2026-06-01 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` wkt_wkb_protocol **Uses:** crypto ieee_754(Precision,ByteOrder,NaNRepresentation) ieee_754_fields(Precision,ByteOrder) list reader **Remarks:** (none) **Inherited public predicates:**  generate/2  parse/2  validate/1  validate/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also wkt_wkb_protocol, geojson, geospatial, cbor, message_pack(StringRepresentation) **protocol** #### `wkt_wkb_protocol` Well-Known Text (WKT) and Well-Known Binary (WKB) geometry parser, generator, and validator protocol. **Availability:** `logtalk_load(wkt_wkb(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2026-06-15 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `generate/2` - `validate/1` - `validate/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses a geometry from the given source. Supported sources are `wkt(file(Path))`, `wkt(stream(Stream))`, `wkt(atom(Atom))`, `wkt(chars(List))`, `wkt(codes(List))`, `wkb(file(Path))`, `wkb(stream(Stream))`, `wkb(bytes(List))`, `wkb(hex(atom(Atom)))`, `wkb(hex(chars(List)))`, and `wkb(hex(codes(List)))`. **Compilation flags:** `static` **Template:** `parse(Source,Geometry)` **Mode and number of proofs:** `parse(++compound,--term)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(wkt_wkb_source,Source)` `Source` data does not represent a valid WKT or WKB geometry: `domain_error(wkt_wkb,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates WKT or WKB content using the representation specified in the first argument from a native geometry term. Supported sinks are `wkt(file(Path))`, `wkt(stream(Stream))`, `wkt(atom(Atom))`, `wkt(chars(List))`, `wkt(codes(List))`, `wkb(file(Path))`, `wkb(stream(Stream))`, `wkb(bytes(List))`, `wkb(hex(atom(Atom)))`, `wkb(hex(chars(List)))`, `wkb(hex(codes(List)))`, and the same WKB sink wrappers wrapped as `wkb(Sink,`` ``Order)` where `Order` is `little` or `big`. **Compilation flags:** `static` **Template:** `generate(Sink,Geometry)` **Mode and number of proofs:** `generate(+compound,++term)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `Sink` is neither a variable nor a valid sink: `domain_error(wkt_wkb_sink,Sink)` `Geometry` is not a valid native geometry term: `domain_error(wkt_wkb,Geometry)` `Geometry` is valid but cannot be represented in WKT due to special ordinates: `domain_error(wkt_wkb_representation,wkt(Geometry))` ------------------------------------------------------------------------ ###### `validate/1` True iff the argument is a valid native WKT/WKB geometry term. **Compilation flags:** `static` **Template:** `validate(Geometry)` **Mode and number of proofs:** `validate(@term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `validate/2` Validates a native geometry term returning a list of reason terms whose final argument is the failing path. **Compilation flags:** `static` **Template:** `validate(Geometry,Errors)` **Mode and number of proofs:** `validate(@term,-list(compound))` - `one_or_error` **Exceptions:** `Geometry` is a variable: `instantiation_error` **Remarks:** > - invalid_geometry_term(Path): The term is not any supported geometry representation. > > - invalid_options(Path): The options argument is not a list. > > - unknown_option(Option, Path): An option term is not recognized. > > - duplicate_option(Name, Path): The same option name occurs more than once. > > - invalid_dimensions(Path): A `dimensions/1` option does not use one of the supported values `xy`, `z`, `m`, or `zm`. > > - invalid_position(Path): A position is not a list of numeric or supported special IEEE-754 coordinates with the expected dimensionality. > > - invalid_position_array(Path): A coordinate array expected to contain positions is not a list. > > - mixed_coordinate_dimension(Path): Coordinates in the same geometry do not all have the same dimensionality. > > - coordinate_dimension_mismatch(Actual, Expected, Path): The coordinates dimensionality does not match the `dimensions/1` option. > > - insufficient_positions(MinimumLength, Path): A coordinate array contains fewer positions than required for the enclosing geometry. > > - ring_not_closed(Path): A polygon ring does not repeat its first position as its last position. > > - invalid_polygon(Path): A polygon coordinate structure is invalid. > > - invalid_multi_polygon(Path): A multi-polygon coordinate structure is invalid. > > - invalid_geometry_collection(Path): A geometry collection member is not a list of valid geometry terms. ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also wkt_wkb, geojson, geospatial ### wrapper") **object** #### `wrapper` Adviser tool for porting and wrapping plain Prolog applications. **Availability:** `logtalk_load(wrapper(loader))` **Author:** Paulo Moura **Version:** 0:12:4 **Date:** 2026-01-20 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` expanding **Provides:** logtalk::message_hook/4 logtalk::message_prefix_stream/4 logtalk::message_tokens//2 **Uses:** logtalk os **Remarks:** > - `prolog_extensions(Extensions)` option: List of file name extensions used to recognize Prolog source files (default is `['.pl','.pro','.prolog']`). > > - `logtalk_extension(Extension)` option: Logtalk file name extension to be used for the generated wrapper files (default is `'.lgt'`). > > - `exclude_files(Files)` option: List of Prolog source files names to exclude (default is `[]`). > > - `exclude_directories(Directories)` option: List of sub-directory names to exclude (default is `[]`). > > - `include_wrapped_files(Boolean)`: Generate `include/1` directives for the wrapped Prolog source files (default is `true`). **Inherited public predicates:**  goal_expansion/2  term_expansion/2 - Public predicates - `rdirectory/2` - `rdirectory/1` - `directory/2` - `directory/1` - `directories/2` - `directories/1` - `files/2` - `files/1` - `file/2` - `file/1` - `save/1` - `save/0` - `default_option/1` - `default_options/1` - Protected predicates - Private predicates - `merge_options/2` - `predicate_called_but_not_defined_/2` - `object_predicate_called_/3` - `module_predicate_called_/3` - `unknown_predicate_called_/2` - `missing_predicate_directive_/3` - `non_standard_predicate_call_/2` - `dynamic_directive_/3` - `multifile_directive_/3` - `add_directive_before_entity_/2` - `add_directive_/2` - `add_directive_/3` - `remove_directive_/2` - `file_being_advised_/4` - Operators ##### Public predicates ###### `rdirectory/2` Advises the user on missing directives for converting all plain Prolog files in a directory and its sub-directories to Logtalk objects using the specified options. **Compilation flags:** `static` **Template:** `rdirectory(Directory,Options)` **Mode and number of proofs:** `rdirectory(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `rdirectory/1` Advises the user on missing directives for converting all plain Prolog files in a directory and its sub-directories to Logtalk objects using default options. **Compilation flags:** `static` **Template:** `rdirectory(Directory)` **Mode and number of proofs:** `rdirectory(+atom)` - `one` ------------------------------------------------------------------------ ###### `directory/2` Advises the user on missing directives for converting all plain Prolog files in a directory to Logtalk objects using the specified options. **Compilation flags:** `static` **Template:** `directory(Directory,Options)` **Mode and number of proofs:** `directory(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `directory/1` Advises the user on missing directives for converting all plain Prolog files in a directory to Logtalk objects using default options. **Compilation flags:** `static` **Template:** `directory(Directory)` **Mode and number of proofs:** `directory(+atom)` - `one` ------------------------------------------------------------------------ ###### `directories/2` Advises the user on missing directives for converting all Prolog files in a set of directories to Logtalk objects using the specified options. **Compilation flags:** `static` **Template:** `directories(Directories,Options)` **Mode and number of proofs:** `directories(+list(atom),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `directories/1` Advises the user on missing directives for converting all Prolog files in a set of directories to Logtalk objects using default options. **Compilation flags:** `static` **Template:** `directories(Directories)` **Mode and number of proofs:** `directories(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `files/2` Advises the user on missing directives for converting a list of plain Prolog files to Logtalk objects using the specified options. **Compilation flags:** `static` **Template:** `files(Files,Options)` **Mode and number of proofs:** `files(+list(atom),+list(compound))` - `one` ------------------------------------------------------------------------ ###### `files/1` Advises the user on missing directives for converting a list of plain Prolog files to Logtalk objects using default options. **Compilation flags:** `static` **Template:** `files(Files)` **Mode and number of proofs:** `files(+list(atom))` - `one` ------------------------------------------------------------------------ ###### `file/2` Advises the user on missing directives for converting a plain Prolog file to Logtalk objects using the specified options. **Compilation flags:** `static` **Template:** `file(File,Options)` **Mode and number of proofs:** `file(+atom,+list(compound))` - `one` ------------------------------------------------------------------------ ###### `file/1` Advises the user on missing directives for converting a plain Prolog file to Logtalk objects using default options. **Compilation flags:** `static` **Template:** `file(File)` **Mode and number of proofs:** `file(+atom)` - `one` ------------------------------------------------------------------------ ###### `save/1` Saves the generated wrapper objects (plus a loader file per directory) for all advised files using the specified options. The wrapper objects are saved to the same directories that contain the wrapped Prolog files. **Compilation flags:** `static` **Template:** `save(Options)` **Mode and number of proofs:** `save(+list(compound))` - `one` ------------------------------------------------------------------------ ###### `save/0` Saves the generated wrapper objects (plus a loader file per directory) for all advised files using default options. The wrapper objects are saved to the same directories that contain the wrapped Prolog files. **Compilation flags:** `static` **Mode and number of proofs:** `save` - `one` ------------------------------------------------------------------------ ###### `default_option/1` Enumerates by backtracking the default options used when generating the wrapper objects. **Compilation flags:** `static` **Template:** `default_option(DefaultOption)` **Mode and number of proofs:** `default_option(?compound)` - `zero_or_more` ------------------------------------------------------------------------ ###### `default_options/1` Returns a list of the default options used when generating the wrapper objects. **Compilation flags:** `static` **Template:** `default_options(DefaultOptions)` **Mode and number of proofs:** `default_options(-list(compound))` - `one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `merge_options/2` Merges the user options with the default options, returning the list of options used when generating the wrapper objects. **Compilation flags:** `static` **Template:** `merge_options(UserOptions,Options)` **Mode and number of proofs:** `merge_options(+list(compound),-list(compound))` - `one` ------------------------------------------------------------------------ ###### `predicate_called_but_not_defined_/2` Table of called object predicates that are not locally defined. **Compilation flags:** `dynamic` **Template:** `predicate_called_but_not_defined_(Object,Predicate)` **Mode and number of proofs:** `predicate_called_but_not_defined_(?atom,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `object_predicate_called_/3` Table of called object predicates. **Compilation flags:** `dynamic` **Template:** `object_predicate_called_(Object,Other,Predicate)` **Mode and number of proofs:** `object_predicate_called_(?atom,?atom,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `module_predicate_called_/3` Table of called module predicates. **Compilation flags:** `dynamic` **Template:** `module_predicate_called_(Object,Module,Predicate)` **Mode and number of proofs:** `module_predicate_called_(?atom,?atom,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `unknown_predicate_called_/2` Table of predicates called but not defined. **Compilation flags:** `dynamic` **Template:** `unknown_predicate_called_(Object,Predicate)` **Mode and number of proofs:** `unknown_predicate_called_(?atom,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `missing_predicate_directive_/3` Table of missing predicate directives. **Compilation flags:** `dynamic` **Template:** `missing_predicate_directive_(Object,Directive,Predicate)` **Mode and number of proofs:** `missing_predicate_directive_(?atom,?predicate_indicator,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `non_standard_predicate_call_/2` Table of called non-standard predicates. **Compilation flags:** `dynamic` **Template:** `non_standard_predicate_call_(Object,Predicate)` **Mode and number of proofs:** `non_standard_predicate_call_(?atom,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `dynamic_directive_/3` Table of declared dynamic predicates. **Compilation flags:** `dynamic` **Template:** `dynamic_directive_(Object,Line,Predicate)` **Mode and number of proofs:** `dynamic_directive_(?atom,?integer,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `multifile_directive_/3` Table of declared multifile predicates. **Compilation flags:** `dynamic` **Template:** `multifile_directive_(Object,Line,Predicate)` **Mode and number of proofs:** `multifile_directive_(?atom,?integer,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `add_directive_before_entity_/2` Table of directives to be added before the entity opening directive. **Compilation flags:** `dynamic` **Template:** `add_directive_before_entity_(Object,Directive)` **Mode and number of proofs:** `add_directive_before_entity_(?atom,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `add_directive_/2` Table of directives to be added. **Compilation flags:** `dynamic` **Template:** `add_directive_(Object,Directive)` **Mode and number of proofs:** `add_directive_(?atom,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `add_directive_/3` Table of directives to be added to complement existing directives. **Compilation flags:** `dynamic` **Template:** `add_directive_(Object,Directive,NewDirective)` **Mode and number of proofs:** `add_directive_(?atom,?predicate_indicator,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `remove_directive_/2` Table of directives to be removed. **Compilation flags:** `dynamic` **Template:** `remove_directive_(Object,Directive)` **Mode and number of proofs:** `remove_directive_(?atom,?predicate_indicator)` - `zero_or_more` ------------------------------------------------------------------------ ###### `file_being_advised_/4` Table of files being advised are respective directories and names (basename without extension). **Compilation flags:** `dynamic` **Template:** `file_being_advised_(File,Path,Directory,Name)` **Mode and number of proofs:** `file_being_advised_(?atom,?atom,?atom,?atom)` - `zero_or_more` ------------------------------------------------------------------------ ##### Operators (none) ### xml_parser") **object** #### `xml` Bi-directional XML parser. **Availability:** `logtalk_load(xml_parser(loader))` **Author:** John Fletcher; adapted to Logtalk by Paulo Moura. **Version:** 3:9:0 **Date:** 2025-10-06 **Copyright:** Copyright (C) 2001-2005 Binding Time Limited, Copyright (C) 2005-2013 John Fletcher **License:** This program is offered free of charge, as unsupported source code. You may use it, copy it, distribute it, modify it or sell it without restriction, but entirely at your own risk. **Compilation flags:** `static,`` ``context_switching_calls` **Uses:** list term **Remarks:** > - On-line documentation: https://binding-time.co.uk/index.php/Parsing_XML_with_Prolog > > - Compliance: This XML parser supports a subset of XML suitable for XML Data and Worldwide Web applications. It is neither as strict nor as comprehensive as the XML 1.0 Specification mandates. > > - Compliance-strictness: It is not as strict, because, while the specification must eliminate ambiguities, not all errors need to be regarded as faults, and some reasonable examples of real XML usage would have to be rejected if they were. > > - Compliance-comprehensive: It is not as comprehensive, because, where the XML specification makes provision for more or less complete DTDs to be provided as part of a document, xml.pl actions the local definition of ENTITIES only. Other DTD extensions are treated as commentary. > > - Bi-directional conversions: Conversions are not fully symmetrical as weaker XML is accepted than can be generated. Notably, in-bound (Codes -\> Document) parsing does not require strictly well-formed XML. If Codes does not represent well-formed XML, Document is instantiated to the term `malformed(,)`. **Inherited public predicates:** (none) - Public predicates - `parse/2` - `parse/3` - `subterm/2` - `pp/1` - Protected predicates - Private predicates - `xml_to_document/3` - `empty_map/1` - `map_member/3` - `map_store/4` - `pp_string/1` - `fault/5` - `exception/4` - `document_generation//2` - `pcdata_7bit//1` - `character_data_format/3` - `cdata_generation//1` - Operators ##### Public predicates ###### `parse/2` Parses a list of character codes to/from a data structure of the form `xml(,)`. **Compilation flags:** `static` **Template:** `parse(Codes,Document)` **Mode and number of proofs:** `parse(+list(character_code),?nonvar)` - `zero_or_one` `parse(?list(character_code),+nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `parse/3` Parses a list of character codes to/from a data structure of the form `xml(,)` using the given list of options. **Compilation flags:** `static` **Template:** `parse(Options,Codes,Document)` **Mode and number of proofs:** `parse(++list(compound),+list(character_code),?nonvar)` - `zero_or_one` `parse(++list(compound),?list(character_code),+nonvar)` - `zero_or_one` **Remarks:** > - `extended_characters(Boolean)` option: Use the extended character entities for XHTML (default `true`). > > - `format(Boolean)` option: For parsing, strip layouts when no character data appears between elements (default `true`). For generating, indent the element content (default `true`). > > - `remove_attribute_prefixes(Boolean)` option: Remove namespace prefixes from attributes when it’s the same as the prefix of the parent element (default `false`). > > - `allow_ampersand(Boolean)` option: Allow unescaped ampersand characters (&) to occur in PCDATA (default `false`). ------------------------------------------------------------------------ ###### `subterm/2` Unifies `Subterm` with a sub-term of `XMLTerm`. Note that `XMLTerm` is a sub-term of itself. **Compilation flags:** `static` **Template:** `subterm(XMLTerm,Subterm)` **Mode and number of proofs:** `subterm(+nonvar,?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `pp/1` Pretty prints a XML document on the current output stream. **Compilation flags:** `static` **Template:** `pp(XMLDocument)` **Mode and number of proofs:** `pp(+nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates ###### `xml_to_document/3` Translates the list of character codes `XML` into the Prolog term `Document`. `Options` is a list of terms controlling the treatment of layout characters and character entities. **Compilation flags:** `static` **Template:** `xml_to_document(Options,XML,Document)` **Mode and number of proofs:** `xml_to_document(+nonvar,+nonvar,?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `empty_map/1` True if `Map` is a null map. **Compilation flags:** `static` **Template:** `empty_map(Map)` **Mode and number of proofs:** `empty_map(?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `map_member/3` True if `Map` is a ordered map structure which records the pair `Key-Data`. `Key` must be ground. **Compilation flags:** `static` **Template:** `map_member(Key,Map,Data)` **Mode and number of proofs:** `map_member(+nonvar,+nonvar,?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `map_store/4` True if `Map0` is an ordered map structure, `Key` must be ground, and `Map1` is identical to `Map0` except that the pair `Key-Data` is recorded by `Map1`. **Compilation flags:** `static` **Template:** `map_store(Map0,Key,Data,Map1)` **Mode and number of proofs:** `map_store(+nonvar,+nonvar,+nonvar,?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `pp_string/1` Prints `String` onto the current output stream. If `String` contains only 7-bit chars it is printed in shorthand quoted format, otherwise it is written as a list. **Compilation flags:** `static` **Template:** `pp_string(String)` **Mode and number of proofs:** `pp_string(+nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `fault/5` Identifies `SubTerm` as a sub-term of `Term` which cannot be serialized after `Indentation`. `Message` is an atom naming the type of error; `Path` is a string encoding a list of `SubTerm`’s ancestor elements in the form `{(id)}*` where `` is the element tag and `` is the value of any attribute \_named\_ `id`. **Compilation flags:** `static` **Template:** `fault(Term,Indentation,SubTerm,Path,Message)` **Mode and number of proofs:** `fault(+nonvar,+nonvar,?nonvar,?nonvar,?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `exception/4` Hook to raise an exception to be raised in respect of a fault in the XML Term `Document`. **Compilation flags:** `static` **Template:** `exception(Message,Document,Culprit,Path)` **Mode and number of proofs:** `exception(+atom,+nonvar,+nonvar,+nonvar)` - `one` ------------------------------------------------------------------------ ###### `document_generation//2` DCG generating Document as a list of character codes. `Format` is true\|false defining whether layouts, to provide indentation, should be added between the element content of the resultant “string”. Note that formatting is disabled for elements that are interspersed with `pcdata/1` terms, such as XHTML’s ‘inline’ elements. Also, `Format` is over-ridden, for an individual element, by an explicit `'xml:space'="preserve"` attribute. **Compilation flags:** `static` **Template:** `document_generation(Format,Document)` **Mode and number of proofs:** `document_generation(+nonvar,+nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `pcdata_7bit//1` Represents the ASCII character set in its simplest format, using the character entities `&`, `"`, `<`, and `>` which are common to both XML and HTML. The numeric entity `'` is used in place of `'` because browsers don’t recognize it in HTML. **Compilation flags:** `static` **Template:** `pcdata_7bit(Code)` **Mode and number of proofs:** `pcdata_7bit(?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `character_data_format/3` Holds when `Format0` and `Format1` are the statuses of XML formatting before and after `Codes` - which may be null. **Compilation flags:** `static` **Template:** `character_data_format(Codes,Format0,Format1)` **Mode and number of proofs:** `character_data_format(+nonvar,+nonvar,?nonvar)` - `zero_or_one` ------------------------------------------------------------------------ ###### `cdata_generation//1` Holds when `Format0` and `Format1` are the statuses of XML formatting before and after `Codes` - which may be null. **Compilation flags:** `static` **Template:** `cdata_generation(Codes)` **Mode and number of proofs:** `cdata_generation(+list)` - `zero_or_one` ------------------------------------------------------------------------ ##### Operators (none) ### yaml") **object** #### `yaml` YAML parser and generator. **Availability:** `logtalk_load(yaml(loader))` **Author:** Paulo Moura **Version:** 1:1:0 **Date:** 2026-04-17 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` yaml_protocol **Uses:** list reader **Remarks:** (none) **Inherited public predicates:**  generate/2  generate_all/2  parse/2  parse_all/2 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) **protocol** #### `yaml_protocol` YAML parser and generator protocol. **Availability:** `logtalk_load(yaml(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-01-31 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `parse/2` - `parse_all/2` - `generate/2` - `generate_all/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `parse/2` Parses YAML content read from the given source (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a ground term representing the parsed YAML data. **Compilation flags:** `static` **Template:** `parse(Source,YAML)` **Mode and number of proofs:** `parse(++compound,--ground)` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(yaml_source,Source)` ------------------------------------------------------------------------ ###### `parse_all/2` Parses all YAML documents from the given source (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) into a list of ground terms. Documents are separated by `---` markers and optionally terminated by `...` markers. **Compilation flags:** `static` **Template:** `parse_all(Source,YAMLs)` **Mode and number of proofs:** `parse_all(++compound,--list(ground))` - `one_or_error` **Exceptions:** `Source` is a variable: `instantiation_error` `Source` is neither a variable nor a valid source: `domain_error(yaml_source,Source)` ------------------------------------------------------------------------ ###### `generate/2` Generates YAML output using the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) from the ground YAML term in the second argument. **Compilation flags:** `static` **Template:** `generate(Sink,YAML)` **Mode and number of proofs:** `generate(++compound,+ground)` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `YAML` is a variable: `instantiation_error` `YAML` is not a valid YAML term: `domain_error(yaml_term,YAML)` `Sink` cannot be generated: `domain_error(yaml_sink,Sink)` ------------------------------------------------------------------------ ###### `generate_all/2` Generates YAML output with multiple documents separated by `---` markers using the representation specified in the first argument (`file(Path)`, `stream(Stream)`, `codes(Codes)`, `chars(Chars)`, or `atom(Atom)`) from the list of ground YAML terms in the second argument. **Compilation flags:** `static` **Template:** `generate_all(Sink,YAMLs)` **Mode and number of proofs:** `generate_all(++compound,+list(ground))` - `one_or_error` **Exceptions:** `Sink` is a variable: `instantiation_error` `YAMLs` is a variable: `instantiation_error` `YAMLs` is not a list: `type_error(list,YAMLs)` An element of `YAMLs` is not a valid YAML term: `domain_error(yaml_term,Term)` `Sink` cannot be generated: `domain_error(yaml_sink,Sink)` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) ### z_score_anomaly_detector") **object** #### `z_score_anomaly_detector` Statistical Z-score anomaly detector for continuous datasets. Learns per-attribute population mean and standard deviation from baseline training examples selected from a dataset object implementing the `anomaly_dataset_protocol` protocol and returns a detector term that can be used for scoring, prediction, and export. **Availability:** `logtalk_load(z_score_anomaly_detector(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2026-05-06 **Compilation flags:** `static,`` ``context_switching_calls` **Imports:** `public` anomaly_detector_common **Uses:** format list numberlist pairs population type **Remarks:** (none) **Inherited public predicates:**  anomaly_detector_options/2  check_anomaly_detector/1  check_option/1  check_options/1  default_option/1  default_options/1  diagnostic/2  diagnostics/2  export_to_clauses/4  export_to_file/4  learn/2  learn/3  option/2  option/3  predict/3  predict/4  print_anomaly_detector/1  score/3  score_all/3  valid_anomaly_detector/1  valid_option/1  valid_options/1 - Public predicates - Protected predicates - Private predicates - Operators ##### Public predicates (no local declarations; see entity ancestors if any) ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) See also anomaly_dataset_protocol, anomaly_detector_protocol, modified_z_score_anomaly_detector, isolation_forest_anomaly_detector, knn_distance_anomaly_detector, lof_anomaly_detector ### zippers") **protocol** #### `zipperp` Zipper protocol. **Availability:** `logtalk_load(zippers(loader))` **Author:** Paulo Moura **Version:** 1:0:0 **Date:** 2019-01-20 **Compilation flags:** `static` **Dependencies:** (none) **Remarks:** (none) **Inherited public predicates:** (none) - Public predicates - `zip/2` - `zip/3` - `unzip/2` - `current/2` - `next/2` - `next/3` - `previous/2` - `previous/3` - `rewind/2` - `rewind/3` - `forward/2` - `forward/3` - `apply/2` - `insert_before/3` - `insert_after/3` - `replace/3` - `delete_and_previous/2` - `delete_and_next/2` - `delete_and_unzip/2` - `delete_all_before/2` - `delete_all_before_and_unzip/2` - `delete_all_after/2` - `delete_all_after_and_unzip/2` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `zip/2` Adds a zipper to a compound term holding a sequence of elements. Fails if the sequence is empty. **Compilation flags:** `static` **Template:** `zip(Sequence,Zipper)` **Mode and number of proofs:** `zip(+sequence,--zipper)` - `zero_or_one` ------------------------------------------------------------------------ ###### `zip/3` Adds a zipper to a compound term holding a sequence of elements. Also returns the first element. Fails if the sequence is empty. **Compilation flags:** `static` **Template:** `zip(Sequence,Zipper,First)` **Mode and number of proofs:** `zip(+sequence,--zipper,--term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `unzip/2` Removes a zipper from a sequence. **Compilation flags:** `static` **Template:** `unzip(Zipper,Sequence)` **Mode and number of proofs:** `unzip(@zipper,--sequence)` - `one` ------------------------------------------------------------------------ ###### `current/2` Current element. **Compilation flags:** `static` **Template:** `current(Zipper,Current)` **Mode and number of proofs:** `current(+zipper,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next/2` Moves to the next element. Fails if already at the last elements. **Compilation flags:** `static` **Template:** `next(Zipper,NewZipper)` **Mode and number of proofs:** `next(+zipper,--zipper)` - `zero_or_one` ------------------------------------------------------------------------ ###### `next/3` Moves to and returns the next element. Fails if already at the last elements. **Compilation flags:** `static` **Template:** `next(Zipper,NewZipper,Next)` **Mode and number of proofs:** `next(+zipper,--zipper,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous/2` Moves to the previous element. Fails if already at the first elements. **Compilation flags:** `static` **Template:** `previous(Zipper,NewZipper)` **Mode and number of proofs:** `previous(+zipper,--zipper)` - `zero_or_one` ------------------------------------------------------------------------ ###### `previous/3` Moves to and returns the previous element. Fails if already at the first element. **Compilation flags:** `static` **Template:** `previous(Zipper,NewZipper,Previous)` **Mode and number of proofs:** `previous(+zipper,--zipper,-term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `rewind/2` Rewinds the zipper so that the first element becomes the current element. **Compilation flags:** `static` **Template:** `rewind(Zipper,NewZipper)` **Mode and number of proofs:** `rewind(+zipper,--zipper)` - `one` ------------------------------------------------------------------------ ###### `rewind/3` Rewinds the zipper so that the first element becomes the current element. Also returns the first element. **Compilation flags:** `static` **Template:** `rewind(Zipper,NewZipper,First)` **Mode and number of proofs:** `rewind(+zipper,--zipper,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `forward/2` Forward the zipper so that the last element becomes the current element. **Compilation flags:** `static` **Template:** `forward(Zipper,NewZipper)` **Mode and number of proofs:** `forward(+zipper,--zipper)` - `one` ------------------------------------------------------------------------ ###### `forward/3` Forward the zipper so that the last element becomes the current element. Also returns the last element. **Compilation flags:** `static` **Template:** `forward(Zipper,NewZipper,Last)` **Mode and number of proofs:** `forward(+zipper,--zipper,?term)` - `zero_or_one` ------------------------------------------------------------------------ ###### `apply/2` Applies a closure to the current element. **Compilation flags:** `static` **Template:** `apply(Closure,Zipper)` **Meta-predicate template:** `apply(1,*)` **Mode and number of proofs:** `apply(+callable,+zipper)` - `zero_or_more` ------------------------------------------------------------------------ ###### `insert_before/3` Inserts an element before the current one. **Compilation flags:** `static` **Template:** `insert_before(Zipper,Element,NewZipper)` **Mode and number of proofs:** `insert_before(+zipper,?term,--zipper)` - `zero_or_one` ------------------------------------------------------------------------ ###### `insert_after/3` Inserts an element after the current one. **Compilation flags:** `static` **Template:** `insert_after(Zipper,Element,NewZipper)` **Mode and number of proofs:** `insert_after(+zipper,?term,--zipper)` - `zero_or_one` ------------------------------------------------------------------------ ###### `replace/3` Replaces the current element with a new element. **Compilation flags:** `static` **Template:** `replace(Zipper,NewCurrent,NewZipper)` **Mode and number of proofs:** `replace(+zipper,?term,--zipper)` - `one` ------------------------------------------------------------------------ ###### `delete_and_previous/2` Deletes the current element and moves to the previous element. Fails if no previous element exists. **Compilation flags:** `static` **Template:** `delete_and_previous(Zipper,NewZipper)` **Mode and number of proofs:** `delete_and_previous(+zipper,--zipper)` - `zero_or_one` ------------------------------------------------------------------------ ###### `delete_and_next/2` Deletes the current element and moves to the next element. Fails if no next element exists. **Compilation flags:** `static` **Template:** `delete_and_next(Zipper,NewZipper)` **Mode and number of proofs:** `delete_and_next(+zipper,--zipper)` - `zero_or_one` ------------------------------------------------------------------------ ###### `delete_and_unzip/2` Deletes the current element and removes the zipper returning the resulting sequence. **Compilation flags:** `static` **Template:** `delete_and_unzip(Zipper,Sequence)` **Mode and number of proofs:** `delete_and_unzip(+zipper,--sequence)` - `one` ------------------------------------------------------------------------ ###### `delete_all_before/2` Deletes all elements before the current element. **Compilation flags:** `static` **Template:** `delete_all_before(Zipper,NewZipper)` **Mode and number of proofs:** `delete_all_before(+zipper,--zipper)` - `one` ------------------------------------------------------------------------ ###### `delete_all_before_and_unzip/2` Deletes all elements before the current element and removes the zipper returning the resulting sequence. **Compilation flags:** `static` **Template:** `delete_all_before_and_unzip(Zipper,NewZipper)` **Mode and number of proofs:** `delete_all_before_and_unzip(+zipper,--sequence)` - `one` ------------------------------------------------------------------------ ###### `delete_all_after/2` Deletes all elements after the current element. **Compilation flags:** `static` **Template:** `delete_all_after(Zipper,NewZipper)` **Mode and number of proofs:** `delete_all_after(+zipper,--zipper)` - `one` ------------------------------------------------------------------------ ###### `delete_all_after_and_unzip/2` Deletes all elements after the current element and removes the zipper returning the resulting sequence. **Compilation flags:** `static` **Template:** `delete_all_after_and_unzip(Zipper,NewZipper)` **Mode and number of proofs:** `delete_all_after_and_unzip(+zipper,--sequence)` - `one` ------------------------------------------------------------------------ ##### Protected predicates (none) ##### Private predicates (none) ##### Operators (none) See also zlist **object** #### `zlist` Zipper list predicates. Zippers should be regarded as opaque terms. **Availability:** `logtalk_load(zippers(loader))` **Author:** Paulo Moura **Version:** 1:0:1 **Date:** 2019-03-12 **Compilation flags:** `static,`` ``context_switching_calls` **Implements:** `public` zipperp **Remarks:** (none) **Inherited public predicates:**  apply/2  current/2  delete_all_after/2  delete_all_after_and_unzip/2  delete_all_before/2  delete_all_before_and_unzip/2  delete_and_next/2  delete_and_previous/2  delete_and_unzip/2  forward/2  forward/3  insert_after/3  insert_before/3  next/2  next/3  previous/2  previous/3  replace/3  rewind/2  rewind/3  unzip/2  zip/2  zip/3 - Public predicates - `zip_at_index/4` - Protected predicates - Private predicates - Operators ##### Public predicates ###### `zip_at_index/4` Adds a zipper to a list opened at the given index and also returns the element at the index. Fails if the list is empty or the index (starting at 1) does not exist. **Compilation flags:** `static` **Template:** `zip_at_index(Index,List,Zipper,Element)` **Mode and number of proofs:** `zip_at_index(+natural,+list,--zipper,--term)` - `zero_or_one` ------------------------------------------------------------------------ ##### Protected predicates (no local declarations; see entity ancestors if any) ##### Private predicates (no local declarations; see entity ancestors if any) ##### Operators (none) ## Directories To load an entity, always load the library that includes it using the goal `logtalk_load(library_name(loader))` instead of using its path. The library loader file ensures that all the required dependencies are also loaded and that any required flags are used. The loading goal can be found in the entity documentation. ### `contributions/flags/` ### `contributions/iso8601/` ### `contributions/pddl_parser/` ### `contributions/verdi_neruda/` ### `contributions/xml_parser/` ### `core/` ### `library/` ### `library/adaptive_boosting_classifier/` ### `library/agglomerative_clusterer/` ### `library/amqp/` ### `library/anomaly_detection_protocols/` ### `library/application/` ### `library/apriori_pattern_miner/` ### `library/arbitrary/` ### `library/arrangements/` ### `library/assignvars/` ### `library/avro/` ### `library/base32/` ### `library/base58/` ### `library/base64/` ### `library/base85/` ### `library/bayesian_ridge_regression/` ### `library/borda_ranker/` ### `library/bradley_terry_ranker/` ### `library/c45_classifier/` ### `library/cartesian_products/` ### `library/cbor/` ### `library/ccsds_frames/` ### `library/ccsds_link_profiles/` ### `library/ccsds_packet_services/` ### `library/ccsds_packetization/` ### `library/ccsds_packets/` ### `library/ccsds_tc_services/` ### `library/ccsds_time_codes/` ### `library/ccsds_time_fields/` ### `library/character_sets/` ### `library/classification_protocols/` ### `library/clo_span_pattern_miner/` ### `library/clustering_protocols/` ### `library/colley_ranker/` ### `library/combinations/` ### `library/command_line_options/` ### `library/copeland_ranker/` ### `library/coroutining/` ### `library/crs_projections/` ### `library/crypto/` ### `library/csv/` ### `library/cuid2/` ### `library/cusum_anomaly_detector/` ### `library/datalog/` ### `library/dates/` ### `library/dates_tz/` ### `library/dbscan_clusterer/` ### `library/dependents/` ### `library/deques/` ### `library/derangements/` ### `library/dictionaries/` ### `library/dif/` ### `library/dimension_reduction_protocols/` ### `library/eclat_pattern_miner/` ### `library/edcg/` ### `library/elastic_net_regression/` ### `library/elo_ranker/` ### `library/events/` ### `library/ewma_anomaly_detector/` ### `library/expand_library_alias_paths/` ### `library/expecteds/` ### `library/format/` ### `library/fp_growth_pattern_miner/` ### `library/frequent_pattern_mining_protocols/` ### `library/gaussian_mixture_clusterer/` ### `library/gaussian_process_regression/` ### `library/genint/` ### `library/gensym/` ### `library/geohash/` ### `library/geojson/` ### `library/geospatial/` ### `library/git/` ### `library/glicko2_periodic_ranker/` ### `library/glicko2_ranker/` ### `library/gradient_boosting_classifier/` ### `library/gradient_boosting_regression/` ### `library/grammars/` ### `library/graphs/` ### `library/gravatar/` ### `library/gsp_pattern_miner/` ### `library/hashes/` ### `library/hdbscan_clusterer/` ### `library/heaps/` ### `library/hierarchical_clustering/` ### `library/hierarchies/` ### `library/hmac/` ### `library/hodge_rank/` ### `library/hook_flows/` ### `library/hook_objects/` ### `library/html/` ### `library/http_authenticate/` ### `library/http_client/` ### `library/http_client_core/` ### `library/http_cookies/` ### `library/http_core/` ### `library/http_cors/` ### `library/http_digest/` ### `library/http_directory_listing/` ### `library/http_htmx/` ### `library/http_multipart/` ### `library/http_parameters/` ### `library/http_process_transport/` ### `library/http_router/` ### `library/http_server/` ### `library/http_server_core/` ### `library/http_session/` ### `library/http_socket_transport/` ### `library/http_static_files/` ### `library/http_websocket/` ### `library/http_websocket_frames/` ### `library/http_websocket_handshake/` ### `library/http_websocket_messages/` ### `library/http_websocket_service/` ### `library/http_websocket_session/` ### `library/ica_projection/` ### `library/ids/` ### `library/ieee_754/` ### `library/intervals/` ### `library/iqr_anomaly_detector/` ### `library/iso_13616/` ### `library/iso_3166/` ### `library/iso_4217/` ### `library/iso_639/` ### `library/iso_9362/` ### `library/isolation_forest_anomaly_detector/` ### `library/java/` ### `library/json/` ### `library/json_graph/` ### `library/json_ld/` ### `library/json_lines/` ### `library/json_patch/` ### `library/json_path/` ### `library/json_pointer/` ### `library/json_rpc/` ### `library/json_schema/` ### `library/jwt/` ### `library/kcenters_clusterer/` ### `library/kemeny_young_ranker/` ### `library/kernel_pca_projection/` ### `library/kernel_svm_classifier/` ### `library/kmeans_clusterer/` ### `library/kmedians_clusterer/` ### `library/kmedoids_clusterer/` ### `library/kmodes_clusterer/` ### `library/knn_classifier/` ### `library/knn_distance_anomaly_detector/` ### `library/knn_regression/` ### `library/kprototypes_clusterer/` ### `library/ksuid/` ### `library/lasso_regression/` ### `library/lda_classifier/` ### `library/lda_projection/` ### `library/linda/` ### `library/linear_algebra/` ### `library/linear_regression/` ### `library/linear_svm_classifier/` ### `library/listing/` ### `library/lof_anomaly_detector/` ### `library/logging/` ### `library/logistic_regression_classifier/` ### `library/loops/` ### `library/massey_ranker/` ### `library/mcp_server/` ### `library/memcached/` ### `library/message_pack/` ### `library/meta/` ### `library/meta_compiler/` ### `library/mime_types/` ### `library/modified_z_score_anomaly_detector/` ### `library/multisets/` ### `library/mutations/` ### `library/naive_bayes_classifier/` ### `library/nanoid/` ### `library/nearest_centroid_classifier/` ### `library/nested_dictionaries/` ### `library/nmea/` ### `library/nmf_projection/` ### `library/open_ai/` ### `library/open_api/` ### `library/open_id/` ### `library/optics_clusterer/` ### `library/optionals/` ### `library/options/` ### `library/os/` ### `library/otp/` ### `library/partitions/` ### `library/pattern_mining_protocols/` ### `library/pca_projection/` ### `library/permutations/` ### `library/plackett_luce_last_ranker/` ### `library/plackett_luce_ranker/` ### `library/pls_projection/` ### `library/prefix_span_pattern_miner/` ### `library/probabilistic_pca_projection/` ### `library/process/` ### `library/protobuf/` ### `library/qda_classifier/` ### `library/queues/` ### `library/random/` ### `library/random_forest_classifier/` ### `library/random_forest_regression/` ### `library/random_projection/` ### `library/rank_centrality/` ### `library/ranked_pairs/` ### `library/ranking_protocols/` ### `library/reader/` ### `library/recorded_database/` ### `library/redis/` ### `library/regression_protocols/` ### `library/regression_tree/` ### `library/regularized_bradley_terry_ranker/` ### `library/rest/` ### `library/ridge_regression/` ### `library/s3/` ### `library/schulze_ranker/` ### `library/sequential_pattern_mining_protocols/` ### `library/sets/` ### `library/sgd_classifier/` ### `library/simulated_annealing/` ### `library/snowflakeid/` ### `library/sockets/` ### `library/spade_pattern_miner/` ### `library/statistics/` ### `library/stemming/` ### `library/stomp/` ### `library/string_distance/` ### `library/strings/` ### `library/subsequences/` ### `library/term_io/` ### `library/thurstone_mosteller_ranker/` ### `library/time_scales/` ### `library/timeout/` ### `library/tle_orbits/` ### `library/toml/` ### `library/toon/` ### `library/truncated_svd_projection/` ### `library/tsv/` ### `library/types/` ### `library/tzif/` ### `library/ulid/` ### `library/union_find/` ### `library/url/` ### `library/uuid/` ### `library/validations/` ### `library/wkt_wkb/` ### `library/yaml/` ### `library/z_score_anomaly_detector/` ### `library/zippers/` ### `ports/fcube/` ### `ports/metagol/` ### `ports/toychr/` ### `tools/assertions/` ### `tools/code_metrics/` ### `tools/dead_code_scanner/` ### `tools/debug_messages/` ### `tools/debugger/` ### `tools/diagrams/` ### `tools/doclet/` ### `tools/help/` ### `tools/issue_creator/` ### `tools/lgtdoc/` ### `tools/lgtunit/` ### `tools/linter_reporter/` ### `tools/mutation_testing/` ### `tools/mutation_testing/mutators/` ### `tools/packs/` ### `tools/ports_profiler/` ### `tools/sarif/` ### `tools/sbom/` ### `tools/tool_diagnostics/` ### `tools/tutor/` ### `tools/wrapper/` ## Entities To load an entity, always load the library that includes it using the goal `logtalk_load(library_name(loader))` instead of loading just the entity. The library loader file ensures that all the required dependencies are also loaded and that any required flags are used. The loading goal can be found in the entity documentation. ### Categories ### Objects ### Protocols ## Predicates This index lists all entities *declaring* a given predicate. To load an entity providing the predicate that you want to call, always load the library that includes it using the goal `logtalk_load(library_name(loader))` instead of loading just the entity. The library loader file ensures that all the required dependencies are also loaded and that any required flags are used. The loading goal can be found in the entity documentation. ### `(/)/2` - help ### `(//)/2` - help ### `(<)/2` - comparingp ### `(<=)/2` - assignvarsp - streamvars ### `(=:=)/2` - comparingp ### `(=<)/2` - comparingp ### `(=>)/2` - assignvarsp - streamvars ### `(=\=)/2` - comparingp ### `=~=`` ``/`` ``2` - lgtunit - number ### `(>)/2` - comparingp ### `(>=)/2` - comparingp ### `abbreviation/2` - tzif_protocol ### `abbreviation/3` - tzif_protocol ### `abbreviation/4` - tzif_protocol ### `abort_transaction/3` - stomp ### `absolute_file_name/2` - osp ### `accept/3` - http_websocket ### `accept/4` - http_websocket ### `accept_websocket/3` - http_server_core ### `ack/3` - stomp ### `acquire/1` - amqp_pool ### `activate_debug_handler/1` - logtalk ### `activate_monitor/0` - monitorp ### `active_debug_handler/1` - logtalk ### `add/1` - registries ### `add/2` - registries ### `add/3` - difflist - registries ### `add/5` - memcached ### `add32/3` - hash_common_32 ### `add32/4` - hash_common_32 ### `add32/5` - hash_common_32 ### `add64/3` - hash_common_64 ### `addDependent/1` - subject ### `add_authentication_info/4` - http_digest ### `add_duration/3` - datep ### `add_edge/4` - unweighted_graph_protocol ### `add_edge/5` - weighted_graph_protocol ### `add_edges/3` - graph_protocol ### `add_matrices/3` - linear_algebra_protocol ### `add_response_headers/4` - http_cors - http_htmx ### `add_rule/3` - datalog_protocol ### `add_scaled_outer_product/4` - linear_algebra_protocol ### `add_scaled_vector/4` - linear_algebra_protocol ### `add_type/2` - mime_types ### `add_type/3` - mime_types ### `add_vectors/3` - linear_algebra_protocol ### `add_vertex/3` - graph_protocol ### `add_vertices/3` - graph_protocol ### `adjacent/3` - geohash_protocol ### `adjacent_bits/4` - geohash_protocol ### `adjacent_int/4` - geohash_protocol ### `after/2` - datep - interval_protocol ### `after/3` - monitoring ### `aggregate_resources/2` - html ### `alias/1` - character_set_protocol ### `all/0` - code_metric - dead_code_scanner - lgtdocp ### `all/1` - code_metric - dead_code_scanner - lgtdocp ### `all_files/0` - diagram(Format) - diagrams(Format) ### `all_files/1` - diagram(Format) - diagrams(Format) ### `all_libraries/0` - diagram(Format) - diagrams(Format) ### `all_libraries/1` - diagram(Format) - diagrams(Format) ### `all_pairs_min_paths/2` - graph_protocol ### `all_pairs_min_predecessors/2` - graph_protocol ### `all_score/1` - code_metric ### `allowed_algorithm/2` - jwt_jwa ### `along_track_distance/4` - geospatial_protocol ### `alternating_subsequence/2` - subsequences_protocol ### `alternating_subsequences/2` - subsequences_protocol ### `ancestor/1` - hierarchyp ### `ancestors/1` - hierarchyp ### `and64/3` - hash_common_64 ### `anomaly_detector_options/2` - anomaly_detector_protocol ### `api_info/1` - http_router - open_api_provider_protocol ### `apid/2` - ccsds_packets(SecondaryHeaderLength) ### `apis/0` - help ### `apis/1` - help ### `append/2` - listp ### `append/3` - listp - memcached - queuep - varlistp ### `append/4` - redis ### `apply/2` - zipperp ### `apply/3` - json_patch_protocol ### `apply/4` - dictionaryp ### `approximately_equal/2` - lgtunit - number ### `approximately_equal/3` - lgtunit - number ### `apr1/3` - crypto ### `arbitrary/1` - arbitrary ### `arbitrary/2` - arbitrary ### `archive/1` - registry_protocol ### `arithmetic_mean/2` - statisticsp ### `arrangement/3` - arrangements_protocol ### `arrangement/4` - arrangements_protocol ### `arrangement_index/4` - arrangements_protocol ### `arrangement_index/5` - arrangements_protocol ### `arrangements/3` - arrangements_protocol ### `arrangements/4` - arrangements_protocol ### `array_list/2` - java_utils_protocol ### `array_to_list/2` - java_utils_protocol ### `array_to_terms/2` - java_utils_protocol ### `array_to_terms/3` - java_utils_protocol ### `articulation_points/2` - undirected_graph_common ### `as_curly_bracketed/2` - dictionaryp - nested_dictionary_protocol ### `as_deque/2` - deque_protocol ### `as_dictionary/2` - dictionaryp ### `as_difflist/2` - list ### `as_heap/2` - heap_protocol ### `as_list/2` - deque_protocol - dictionaryp - difflist - heap_protocol - queuep - setp ### `as_nested_dictionary/2` - nested_dictionary_protocol ### `as_set/2` - setp ### `ask_question/5` - logtalk ### `assert_fact/1` - datalog_protocol ### `assertion/1` - assertions(Mode) - lgtunit ### `assertion/2` - assertions(Mode) - lgtunit ### `assignable/1` - assignvarsp ### `assignable/2` - assignvarsp ### `atom_string/2` - string(Representation) ### `atomics_to_string/2` - string(Representation) ### `atomics_to_string/3` - string(Representation) ### `attribute_values/2` - anomaly_dataset_protocol - clustering_dataset_protocol - dataset_protocol - dimension_reduction_dataset_protocol - regression_dataset_protocol ### `authentication_info/2` - http_digest ### `authorization/2` - http_authenticate - http_digest ### `authorization_code/4` - open_id - open_id_response ### `authorization_response/3` - open_id - open_id_response ### `authorization_url/5` - open_id - open_id_pkce ### `authorize_request/6` - http_digest ### `available/0` - packs ### `available/1` - packs ### `available/2` - packs ### `avatar_alt_text/2` - gravatar ### `avatar_url/2` - gravatar ### `average/2` - numberlistp ### `average_deviation/3` - statisticsp ### `backward_substitution/3` - linear_algebra_protocol ### `basic_ack/3` - amqp ### `basic_cancel/3` - amqp ### `basic_consume/3` - amqp ### `basic_get/3` - amqp ### `basic_nack/3` - amqp ### `basic_publish/4` - amqp ### `basic_qos/2` - amqp ### `basic_recover/2` - amqp ### `basic_reject/3` - amqp ### `basis_vector/3` - linear_algebra_protocol ### `bbox_contains/2` - geospatial_protocol ### `bbox_contains_polygon/2` - geospatial_protocol ### `bbox_expand/3` - geospatial_protocol ### `bbox_from_coordinates/2` - geospatial_protocol ### `bbox_intersects/2` - geospatial_protocol ### `bbox_intersects_polygon/2` - geospatial_protocol ### `bbox_intersects_polyline/2` - geospatial_protocol ### `bbox_overlaps/2` - geospatial - geospatial_protocol ### `bbox_union/3` - geospatial_protocol ### `before/2` - datep - interval_protocol ### `before/3` - monitoring ### `begin/0` - datalog_protocol ### `begin/3` - http_server_core_session ### `begin_transaction/3` - stomp ### `bell/2` - natural ### `bench_goal/1` - databasep ### `benchmark/2` - lgtunit ### `benchmark/3` - lgtunit ### `benchmark/4` - lgtunit ### `benchmark_reified/3` - lgtunit ### `bernoulli/2` - sampling_protocol ### `beta/3` - sampling_protocol ### `between/3` - integer - random_protocol ### `between/4` - float ### `bic/5` - iso_9362_protocol ### `big_endian_word32/2` - hash_common_32 ### `binary_body/2` - rest ### `binomial/3` - natural - sampling_protocol ### `bit//1` - number_grammars(Format) ### `bits//1` - number_grammars(Format) ### `blank//0` - blank_grammars(Format) ### `blanks//0` - blank_grammars(Format) ### `block_size/1` - hash_digest_protocol ### `body/1` - http_request_protocol - http_response_protocol ### `body/2` - http_core ### `body/3` - http_multipart ### `body_pred/1` - metagol ### `bounding_box/2` - geohash_protocol ### `bounding_box/3` - geospatial_protocol ### `bounding_box_bits/3` - geohash_protocol ### `bounding_box_int/3` - geohash_protocol ### `branch/2` - git_protocol ### `breadth_first_order/3` - graph_protocol ### `bridges/2` - undirected_graph_common ### `broadcast/2` - http_websocket_service_registry ### `broadcast_except/3` - http_websocket_service_registry ### `built_date/1` - application_protocol ### `built_in_directive/4` - help ### `built_in_flag/2` - flags ### `built_in_method/4` - help ### `built_in_non_terminal/4` - help ### `built_in_predicate/4` - help ### `bypass_flag/2` - ccsds_tc_frames(FrameLength,SegmentHeaderLength,HasFECF) ### `byte_count/1` - ieee_754_fields_protocol - ieee_754_protocol ### `bytes_hex/2` - hash_common_32 ### `bytes_to_codes/2` - character_set_protocol ### `cache/1` - tzif_protocol ### `cache_source/1` - tzif_protocol ### `cached_jwks/3` - open_id - open_id_jwks_cache ### `cached_tzif/1` - tzif_protocol ### `calendar_month/3` - iso8601 ### `call_with_timeout/2` - timeout ### `call_with_timeout/3` - timeout ### `canonical_bic/2` - iso_9362_protocol ### `canonical_iban/2` - iso_13616_protocol ### `canonical_query/2` - s3_signing ### `canonical_request/6` - s3_signing ### `canonical_uri/4` - s3_endpoints ### `canonical_uri/5` - s3_endpoints ### `capabilities/1` - mcp_tool_protocol ### `cartesian_product/2` - cartesian_products_protocol ### `cartesian_product/3` - cartesian_products_protocol ### `cartesian_tuple/2` - cartesian_products_protocol ### `cartesian_tuple/3` - cartesian_products_protocol ### `cartesian_tuple_index/3` - cartesian_products_protocol ### `cartesian_tuple_index/4` - cartesian_products_protocol ### `cas/6` - memcached ### `cat/2` - maybe ### `catalan/2` - natural ### `cell_dimensions/3` - geohash_protocol ### `center_gram_matrix/4` - linear_algebra_protocol ### `center_gram_vector/4` - linear_algebra_protocol ### `central_moment/3` - statisticsp ### `challenge/2` - http_authenticate - http_digest ### `change_directory/1` - osp ### `changed/0` - subject ### `changed/1` - subject ### `channel_close/1` - amqp ### `channel_close/3` - amqp ### `channel_open/3` - amqp ### `chebyshev_distance/3` - numberlistp ### `chebyshev_norm/2` - numberlistp ### `check/0` - command_line_option ### `check/1` - termp - varlistp ### `check/2` - type ### `check/3` - type ### `check_anomaly_detector/1` - anomaly_detector_protocol ### `check_classifier/1` - classifier_protocol ### `check_clusterer/1` - clusterer_protocol ### `check_conversion/3` - time_scales_protocol ### `check_convert/4` - time_scales_protocol ### `check_dimension_reducer/1` - dimension_reducer_protocol ### `check_instant/1` - time_scales_protocol ### `check_offset/3` - time_scales_protocol ### `check_option/1` - options_protocol ### `check_options/1` - options_protocol ### `check_pattern_miner/1` - pattern_miner_protocol ### `check_ranker/1` - ranker_protocol ### `check_regressor/1` - regressor_protocol ### `checksum/2` - nmea_protocol ### `chi_squared/2` - sampling_protocol ### `children/2` - geohash_protocol ### `cholesky_decomposition/2` - linear_algebra_protocol ### `chr_is/2` - toychrdb ### `chr_no_spy/1` - toychrdb ### `chr_nospy/0` - toychrdb ### `chr_notrace/0` - toychrdb ### `chr_option/2` - toychrdb ### `chr_spy/1` - toychrdb ### `chr_trace/0` - toychrdb ### `circular_uniform_cartesian/3` - sampling_protocol ### `circular_uniform_polar/3` - sampling_protocol ### `claim/3` - jwt - jwt_claims ### `claims/2` - jwt - jwt_compact ### `class/1` - anomaly_dataset_protocol - class_hierarchyp - dataset_protocol - supervised_dimension_reduction_dataset_protocol ### `class_values/1` - anomaly_dataset_protocol - dataset_protocol - supervised_dimension_reduction_dataset_protocol ### `classes/1` - class_hierarchyp ### `classifier_options/2` - classifier_protocol ### `classify/2` - ieee_754_fields_protocol ### `clause/5` - ports_profiler ### `clause_location/6` - ports_profiler ### `clean/0` - packs - registries ### `clean/1` - packs - registries ### `clean/2` - packs ### `clear/0` - datalog_protocol - open_id_jwks_cache ### `clear/1` - http_cookie_jar - open_id_jwks_cache ### `clear_cache/0` - tzif_protocol ### `clear_dut1_override/0` - time_scales_data - time_scales_protocol ### `clear_leap_seconds_override/0` - time_scales_data - time_scales_protocol ### `client_open/4` - socket ### `client_open/5` - socket ### `clockwise_polygon/2` - geospatial_protocol ### `clone/1` - cloning - registry_protocol ### `clone/3` - dictionaryp ### `clone/4` - dictionaryp ### `close/1` - amqp - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) - http_cookie_jar - http_server - http_server_core_session - http_websocket - http_websocket_service_registry - s3_session(HTTPTransport) ### `close/2` - http_websocket - socket ### `close/3` - amqp ### `close_client/1` - linda_client ### `close_connection/1` - http_transport_protocol ### `close_connection_pool/1` - http_transport_protocol ### `close_listener/1` - http_transport_protocol ### `close_polygon/2` - geospatial_protocol ### `cluster/3` - clusterer_protocol ### `cluster_probabilities/3` - gaussian_mixture_clusterer ### `clusterer_options/2` - clusterer_protocol ### `coarse/2` - ccsds_cuc(CoarseOctets,FineOctets,Epoch) ### `code_challenge/2` - open_id_pkce ### `code_verifier/2` - open_id_pkce ### `codes_to_bytes/2` - character_set_protocol ### `coefficient_of_variation/2` - statisticsp ### `combination/3` - combinations_protocol ### `combination/4` - combinations_protocol ### `combination_index/4` - combinations_protocol ### `combination_index/5` - combinations_protocol ### `combinations/3` - combinations_protocol ### `combinations/4` - combinations_protocol ### `command_line_arguments/1` - osp ### `commit/0` - datalog_protocol ### `commit_author/2` - git_protocol ### `commit_date/2` - git_protocol ### `commit_hash/2` - git_protocol ### `commit_hash_abbreviated/2` - git_protocol ### `commit_log/3` - git_protocol ### `commit_message/2` - git_protocol ### `commit_transaction/3` - stomp ### `common_prefix/3` - geohash_protocol ### `common_subsequence/3` - subsequences_protocol ### `common_subsequences/3` - subsequences_protocol ### `compact/3` - json_ld_protocol ### `compact/4` - jwt_compact ### `company/2` - gravatar ### `compare_date_time/3` - datep ### `compatible_key/2` - jwt_jwk ### `compile_aux_clauses/1` - logtalk ### `compile_predicate_heads/4` - logtalk ### `compile_predicate_indicators/3` - logtalk ### `complement/2` - unweighted_graph_protocol ### `completion/2` - help ### `completions/2` - help ### `compose/3` - interval_algebra_protocol - interval_relation_set_protocol - unweighted_directed_graph(Dictionary) ### `compress/2` - geohash_protocol ### `confirm_select/1` - amqp ### `connect/1` - redis ### `connect/2` - memcached ### `connect/3` - memcached - redis ### `connect/4` - amqp - stomp ### `connected_components/2` - unweighted_undirected_graph(Dictionary) - weighted_undirected_graph(Dictionary) ### `connection_alive/1` - amqp - stomp ### `connection_pool_stats/2` - http_transport_protocol ### `connection_streams/3` - http_transport_protocol ### `consensus_ranking/2` - kemeny_young_ranker ### `consensus_score/2` - kemeny_young_ranker ### `consistent/1` - interval_constraint_network_protocol ### `console/1` - redis ### `constraints/2` - interval_constraint_network_protocol ### `contains/2` - interval_protocol ### `contradiction/2` - interval_constraint_network_protocol ### `contradiction_explanations/2` - interval_constraint_network_protocol ### `control//0` - blank_grammars(Format) ### `control_command_flag/2` - ccsds_tc_frames(FrameLength,SegmentHeaderLength,HasFECF) ### `control_construct/4` - help ### `controls//0` - blank_grammars(Format) ### `converse/2` - interval_algebra_protocol - interval_relation_set_protocol ### `convert/4` - time_scales_protocol ### `convert_zones/4` - dates_tz_protocol ### `convert_zones_with_resolution/5` - dates_tz_protocol ### `cookie_attribute_present/2` - http_cookies(Representation) ### `cookie_attribute_value/3` - http_cookies(Representation) ### `cookie_attribute_value/4` - http_cookies(Representation) ### `cookie_count/2` - http_cookie_jar ### `cookie_deletion/3` - http_cookies(Representation) ### `cookie_expiry/2` - http_cookies(Representation) ### `cookie_expiry/3` - http_cookies(Representation) ### `cookie_jar/2` - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) ### `cookies/2` - http_cookie_jar ### `cooling_schedule/3` - simulated_annealing_protocol ### `coordinates_bounding_box/2` - geospatial_protocol ### `copy_file/2` - osp ### `copy_object/5` - s3_protocol ### `copy_object/6` - s3_session(HTTPTransport) ### `copy_object_response/2` - s3_xml ### `correlation/3` - statisticsp ### `cosine_similarity/3` - string_distance(Representation) ### `count/2` - http_server_core_session ### `count_arrangements/3` - arrangements_protocol ### `count_cartesian_product/2` - cartesian_products_protocol ### `count_combinations/3` - combinations_protocol ### `count_derangements/2` - derangements_protocol ### `count_distinct_arrangements/3` - arrangements_protocol ### `count_distinct_cartesian_product/2` - cartesian_products_protocol ### `count_distinct_combinations/3` - combinations_protocol ### `count_distinct_derangements/2` - derangements_protocol ### `count_distinct_multisets/3` - multisets_protocol ### `count_distinct_partitions/2` - partitions_protocol ### `count_distinct_partitions/3` - partitions_protocol ### `count_distinct_permutations/2` - permutations_protocol ### `count_distinct_subsequences/3` - subsequences_protocol ### `count_multisets/3` - multisets_protocol ### `count_partial_derangements/3` - derangements_protocol ### `count_partitions/2` - partitions_protocol ### `count_partitions/3` - partitions_protocol ### `count_permutations/2` - permutations_protocol ### `count_subsequences/2` - subsequences_protocol ### `counter/2` - counters - mutations_store ### `counterclockwise_polygon/2` - geospatial_protocol ### `country/4` - iso_3166_1 - iso_3166_protocol ### `country_spec/3` - iso_13616_registry ### `covariance/3` - statisticsp ### `covariance_matrix/2` - linear_algebra_protocol ### `cover/1` - lgtunit ### `coverage_clause_mutator/0` - mutator_protocol ### `covering/3` - geohash_protocol ### `covering/4` - geohash_protocol ### `cpu_time/1` - osp - timep ### `create/3` - process ### `create_multipart_upload_response/2` - s3_xml ### `created_response/4` - rest ### `creators/1` - application_protocol ### `cross_track_distance/4` - geospatial_protocol ### `crs_dimensions/2` - crs_projections_protocol ### `crs_epsg/2` - crs_projections_protocol ### `crs_kind/2` - crs_projections_protocol ### `crs_name/2` - crs_projections_protocol ### `crs_units/2` - crs_projections_protocol ### `currency/5` - iso_4217 - iso_4217_protocol ### `current/2` - http_server_core_session - zipperp ### `current_host/1` - socket ### `current_url/2` - http_htmx ### `current_url_abs_path/2` - http_htmx ### `cut/3` - hierarchical_clustering ### `cycle/2` - directed_graph_protocol - undirected_graph_common ### `damerau_levenshtein/3` - string_distance(Representation) ### `data/0` - ports_profiler ### `data/1` - ports_profiler ### `data/2` - http_server_core_session - nmea_protocol - ports_profiler ### `data_field/2` - ccsds_frame_protocol - ccsds_frames ### `data_length/2` - ccsds_packets(SecondaryHeaderLength) ### `date/4` - iso8601 ### `date/5` - iso8601 ### `date/6` - iso8601 ### `date/7` - iso8601 ### `date_string/3` - iso8601 ### `date_time/7` - osp ### `date_time_string/3` - iso8601 ### `date_time_to_unix/2` - datep ### `day/2` - ccsds_ccs(CalendarVariant,FractionOctets) ### `day_of_year/2` - ccsds_ccs(CalendarVariant,FractionOctets) - datep ### `day_of_year_date/3` - datep ### `daylight_saving_time/2` - tzif_protocol ### `daylight_saving_time/3` - tzif_protocol ### `daylight_saving_time/4` - tzif_protocol ### `days/2` - ccsds_cds(DaySegmentOctets,SubmillisecondOctets,Epoch) ### `days_in_month/3` - datep ### `deactivate_debug_handler/0` - logtalk ### `debug/0` - debuggerp ### `debug_handler/1` - logtalk ### `debug_handler/3` - logtalk ### `debugging/0` - debuggerp ### `debugging/1` - debuggerp ### `decide/1` - fcube ### `decide/2` - fcube ### `decode/2` - geohash_protocol - json_rpc ### `decode/3` - jwt - jwt_compact - open_id_jwt ### `decode/5` - jwt - jwt_compact ### `decode_bits/3` - geohash_protocol ### `decode_body/4` - http_body_codec_protocol - http_core ### `decode_exception/2` - java_utils_protocol ### `decode_exception/3` - java_utils_protocol ### `decode_frame/2` - amqp ### `decode_int/3` - geohash_protocol ### `decompile_predicate_heads/4` - logtalk ### `decompile_predicate_indicators/4` - logtalk ### `decompose_file_name/3` - osp ### `decompose_file_name/4` - osp ### `decr/3` - redis ### `decr/4` - memcached ### `decrby/4` - redis ### `decrement_counter/1` - counters ### `default/1` - command_line_option ### `default_option/1` - options_protocol - wrapper ### `default_options/1` - options_protocol - wrapper ### `define_log_file/2` - loggingp ### `defined/4` - registries ### `defined_flag/6` - flags ### `degree/3` - unweighted_undirected_graph(Dictionary) - weighted_undirected_graph(Dictionary) ### `del/3` - redis ### `del_monitors/0` - event_registryp ### `del_monitors/4` - event_registryp ### `del_spy_points/4` - monitorp ### `delete/0` - registries ### `delete/1` - registries ### `delete/2` - memcached - registries ### `delete/3` - http_client - listp - setp - varlistp ### `delete/4` - dictionaryp - heap_protocol - http_client - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) ### `delete_all_after/2` - zipperp ### `delete_all_after_and_unzip/2` - zipperp ### `delete_all_before/2` - zipperp ### `delete_all_before_and_unzip/2` - zipperp ### `delete_and_next/2` - zipperp ### `delete_and_previous/2` - zipperp ### `delete_and_unzip/2` - zipperp ### `delete_directory/1` - osp ### `delete_directory_and_contents/1` - osp ### `delete_directory_contents/1` - osp ### `delete_edge/4` - unweighted_graph_protocol ### `delete_edge/5` - weighted_graph_protocol ### `delete_edges/3` - graph_protocol ### `delete_file/1` - osp ### `delete_in/4` - nested_dictionary_protocol ### `delete_matches/3` - listp ### `delete_max/4` - dictionaryp ### `delete_min/4` - dictionaryp ### `delete_object/4` - s3_protocol ### `delete_object/5` - s3_session(HTTPTransport) ### `delete_vertex/3` - graph_protocol ### `delete_vertices/3` - graph_protocol ### `dependents/1` - packs - subject ### `dependents/2` - packs ### `dependents/3` - packs ### `depth/2` - termp ### `depth_first_order/3` - graph_protocol ### `derangement/2` - derangements_protocol ### `derangement/3` - derangements_protocol ### `derangement_index/3` - derangements_protocol ### `derangement_index/4` - derangements_protocol ### `derangements/2` - derangements_protocol ### `derangements/3` - derangements_protocol ### `descendant/1` - hierarchyp ### `descendant_class/1` - class_hierarchyp ### `descendant_classes/1` - class_hierarchyp ### `descendant_instance/1` - class_hierarchyp ### `descendant_instances/1` - class_hierarchyp ### `descendants/1` - hierarchyp ### `describe/1` - packs - registries ### `describe/2` - packs ### `description/1` - application_protocol - pack_protocol - registry_protocol ### `description/2` - gravatar ### `destination_point/4` - geospatial_protocol ### `destroy/0` - amqp_pool ### `destroy/1` - http_server_core_session ### `determinant/2` - linear_algebra_protocol ### `deterministic/1` - lgtunit ### `deterministic/2` - lgtunit ### `diagnostic/2` - anomaly_detector_protocol - classifier_protocol - clusterer_protocol - dimension_reducer_protocol - pattern_miner_protocol - ranker_protocol - regressor_protocol - tool_diagnostics_protocol ### `diagnostic/3` - tool_diagnostics_protocol ### `diagnostic_rule/5` - tool_diagnostics_protocol ### `diagnostic_rules/1` - tool_diagnostics_protocol ### `diagnostic_target/1` - tool_diagnostics_protocol ### `diagnostics/2` - anomaly_detector_protocol - classifier_protocol - clusterer_protocol - dimension_reducer_protocol - pattern_miner_protocol - ranker_protocol - regressor_protocol - tool_diagnostics_protocol ### `diagnostics/3` - tool_diagnostics_protocol ### `diagnostics_preflight/2` - tool_diagnostics_protocol ### `diagnostics_preflight/3` - tool_diagnostics_protocol ### `diagnostics_summary/2` - tool_diagnostics_protocol ### `diagnostics_summary/3` - tool_diagnostics_protocol ### `diagnostics_tool/5` - tool_diagnostics_protocol ### `diagonal_matrix/2` - linear_algebra_protocol ### `diagonal_matrix/3` - linear_algebra_protocol ### `diagonal_matrix/4` - linear_algebra_protocol ### `diagram_description/1` - diagram(Format) ### `diagram_name_suffix/1` - diagram(Format) ### `dif/1` - coroutining - dif ### `dif/2` - coroutining - dif ### `difference_norm/3` - linear_algebra_protocol ### `digest/2` - hash_digest_protocol ### `digest/4` - hmac_protocol ### `digest/5` - hmac_protocol ### `digest_size/1` - hash_digest_protocol ### `digit//1` - number_grammars(Format) ### `digits//1` - number_grammars(Format) ### `dimension_reducer_options/2` - dimension_reducer_protocol ### `directories/1` - lgtdocp - wrapper ### `directories/2` - diagram(Format) - diagrams(Format) - lgtdocp - wrapper ### `directories/3` - diagram(Format) - diagrams(Format) ### `directory/1` - code_metric - dead_code_scanner - diagram(Format) - diagrams(Format) - lgtdocp - mutation_testing - packs_common - wrapper ### `directory/2` - code_metric - dead_code_scanner - diagram(Format) - diagrams(Format) - lgtdocp - mutation_testing - packs_common - wrapper ### `directory/3` - diagram(Format) - diagrams(Format) ### `directory_exists/1` - osp ### `directory_files/2` - osp ### `directory_files/3` - osp ### `directory_mutants/2` - mutation_testing ### `directory_mutants/3` - mutation_testing ### `directory_score/2` - code_metric ### `dirichlet/2` - sampling_protocol ### `disable/0` - linter_reporter ### `disable/1` - debug_messages ### `disable/2` - debug_messages ### `disable_logging/1` - loggingp ### `disconnect/1` - memcached - redis ### `disconnect/2` - stomp ### `discover/3` - open_id - open_id_client ### `discovery_url/2` - open_id_discovery ### `disjoint/2` - setp ### `disjoint_sets/2` - union_find_protocol ### `dispatch/3` - http_server_core ### `dispatch_map_id/2` - ccsds_tc_services ### `dispatch_service_units/2` - ccsds_tc_services ### `dispatch_service_units_by_map/2` - ccsds_tc_services ### `dispatch_service_units_by_map/3` - ccsds_tc_services ### `display_name/2` - gravatar ### `distance/4` - geospatial - geospatial_protocol ### `distance/5` - geospatial - geospatial_protocol ### `distinct_arrangement/3` - arrangements_protocol ### `distinct_arrangement/4` - arrangements_protocol ### `distinct_arrangement_index/4` - arrangements_protocol ### `distinct_arrangements/3` - arrangements_protocol ### `distinct_arrangements/4` - arrangements_protocol ### `distinct_cartesian_product/2` - cartesian_products_protocol ### `distinct_cartesian_product/3` - cartesian_products_protocol ### `distinct_cartesian_tuple/2` - cartesian_products_protocol ### `distinct_cartesian_tuple/3` - cartesian_products_protocol ### `distinct_cartesian_tuple_index/3` - cartesian_products_protocol ### `distinct_combination/3` - combinations_protocol ### `distinct_combination/4` - combinations_protocol ### `distinct_combination_index/4` - combinations_protocol ### `distinct_combinations/3` - combinations_protocol ### `distinct_combinations/4` - combinations_protocol ### `distinct_derangement/2` - derangements_protocol ### `distinct_derangement/3` - derangements_protocol ### `distinct_derangement_index/3` - derangements_protocol ### `distinct_derangements/2` - derangements_protocol ### `distinct_derangements/3` - derangements_protocol ### `distinct_multiset/3` - multisets_protocol ### `distinct_multiset/4` - multisets_protocol ### `distinct_multiset_index/4` - multisets_protocol ### `distinct_multisets/3` - multisets_protocol ### `distinct_multisets/4` - multisets_protocol ### `distinct_partition/2` - partitions_protocol ### `distinct_partition/3` - partitions_protocol ### `distinct_partition/4` - partitions_protocol ### `distinct_partition_index/3` - partitions_protocol ### `distinct_partition_index/4` - partitions_protocol ### `distinct_partition_index/5` - partitions_protocol ### `distinct_partitions/2` - partitions_protocol ### `distinct_partitions/3` - partitions_protocol ### `distinct_partitions/4` - partitions_protocol ### `distinct_permutation/2` - permutations_protocol ### `distinct_permutation/3` - permutations_protocol ### `distinct_permutation_index/3` - permutations_protocol ### `distinct_permutations/2` - permutations_protocol ### `distinct_permutations/3` - permutations_protocol ### `distribution/1` - application_protocol ### `doc_goal/1` - doclet ### `document/1` - open_ai - sbom ### `document/2` - open_api - sbom ### `dot//1` - number_grammars(Format) ### `dot_product/3` - linear_algebra_protocol ### `double_metaphone/3` - string_distance(Representation) ### `double_metaphone_match/2` - string_distance(Representation) ### `dowhile/2` - loopp ### `drop/3` - listp ### `duration_between/3` - datep ### `duration_string/2` - iso8601 ### `during/2` - interval_protocol ### `dut1_entries/1` - time_scales_data - time_scales_protocol ### `dut1_offset_at_utc_unix/3` - time_scales_data ### `dut1_source/1` - time_scales_data - time_scales_protocol ### `easter_day/3` - iso8601 ### `edge/3` - unweighted_graph_protocol ### `edge/4` - weighted_graph_protocol ### `edge/5` - json_graph_data_protocol ### `edge/6` - graph_language_protocol ### `edge_case/2` - arbitrary ### `edges/2` - graph_protocol ### `edit_similarity/3` - string_distance(Representation) ### `edit_similarity/4` - string_distance(Representation) ### `either/3` - expected(Expected) ### `elicit_request/5` - mcp_server ### `email_hash/2` - gravatar ### `empty/1` - deque_protocol - dictionaryp - graph_protocol - heap_protocol - interval_relation_set_protocol - listp - nested_dictionary_protocol - optional - queuep - setp - varlistp ### `enable/0` - linter_reporter ### `enable/1` - debug_messages - linter_reporter ### `enable/2` - debug_messages ### `enable_logging/1` - loggingp ### `enabled/1` - debug_messages ### `enabled/2` - debug_messages ### `encode/2` - json_rpc ### `encode/3` - geohash_protocol ### `encode_bits/3` - geohash_protocol ### `encode_body/4` - http_body_codec_protocol - http_core ### `encode_frame/2` - amqp ### `encode_int/3` - geohash_protocol ### `encoding_suffix/2` - mime_types ### `ensure/2` - http_server_core_session ### `ensure_directory/1` - osp ### `ensure_file/1` - osp ### `entailment_explanations/5` - interval_constraint_network_protocol ### `entails/4` - interval_constraint_network_protocol ### `entails/5` - interval_constraint_network_protocol ### `entity/1` - code_metric - dead_code_scanner - help - mutation_testing - xref_diagram(Format) ### `entity/2` - dead_code_scanner - mutation_testing - xref_diagram(Format) ### `entity_info_pair_score_hook/3` - doc_metric ### `entity_info_score_hook/2` - doc_metric ### `entity_mutants/2` - mutation_testing ### `entity_mutants/3` - mutation_testing ### `entity_predicates_weights_hook/2` - doc_metric ### `entity_prefix/2` - logtalk ### `entity_score/2` - code_metric ### `enumerate/2` - random_protocol ### `environment_variable/2` - osp ### `epoch/1` - ccsds_time_code_protocol ### `epoch/2` - ccsds_time_fields ### `epsg_crs/2` - crs_projections_protocol ### `epsilon/1` - lgtunit ### `equal/2` - interval_protocol - setp ### `equirectangular_inverse/4` - geospatial_protocol ### `equirectangular_projection/4` - geospatial_protocol ### `equivalent/2` - interval_constraint_network_protocol - url(Representation) ### `erase/1` - recorded_database_core ### `error/2` - json_rpc ### `error_code/2` - json_rpc ### `error_data/2` - json_rpc ### `error_message/2` - json_rpc ### `error_response/2` - s3_xml ### `error_response/4` - json_rpc ### `error_response/5` - json_rpc ### `es256_signature_der/2` - jwt_der - open_id_der ### `essentially_equal/3` - lgtunit - number ### `estimate_temperature/1` - simulated_annealing(Problem,RandomAlgorithm) ### `estimate_temperature/2` - simulated_annealing(Problem,RandomAlgorithm) ### `euclidean_distance/3` - numberlistp ### `euclidean_norm/2` - linear_algebra_protocol - numberlistp ### `evaluate/3` - json_path_protocol - json_pointer_protocol ### `evaluate_relative/4` - json_pointer_protocol ### `event/2` - open_ai_event_stream ### `exactly_representable/1` - ieee_754_protocol ### `example/2` - clustering_dataset_protocol - dimension_reduction_dataset_protocol ### `example/3` - anomaly_dataset_protocol - dataset_protocol - regression_dataset_protocol - supervised_dimension_reduction_dataset_protocol - target_supervised_dimension_reduction_dataset_protocol ### `exchange/3` - http_transport_protocol ### `exchange/4` - http_client_core - http_transport_protocol ### `exchange/5` - http_transport_protocol ### `exchange_bind/4` - amqp ### `exchange_code/5` - open_id - open_id_client ### `exchange_declare/3` - amqp ### `exchange_delete/3` - amqp ### `exchange_sequence/3` - http_transport_protocol ### `exchange_sequence/4` - http_client_core - http_transport_protocol ### `exchange_unbind/4` - amqp ### `exclude/3` - metap ### `excluded/4` - interval_constraint_network_protocol ### `execution_context/7` - logtalk ### `exists/3` - redis ### `expand/2` - geohash_protocol - json_ld_protocol ### `expand_int/3` - geohash_protocol ### `expand_library_path/2` - logtalk ### `expected/1` - expected(Expected) ### `expecteds/2` - either ### `expire/4` - redis ### `explain/2` - datalog_protocol ### `explain//1` - tutor_explanations ### `exponential/2` - sampling_protocol ### `export/1` - sbom ### `export/2` - sbom ### `export_to_clauses/4` - anomaly_detector_protocol - classifier_protocol - clusterer_protocol - dimension_reducer_protocol - pattern_miner_protocol - ranker_protocol - regressor_protocol ### `export_to_file/4` - anomaly_detector_protocol - classifier_protocol - clusterer_protocol - dimension_reducer_protocol - pattern_miner_protocol - ranker_protocol - regressor_protocol ### `extension/1` - proto_hierarchyp ### `extension_type/2` - mime_types ### `extension_type/3` - mime_types ### `extensions/1` - proto_hierarchyp ### `external_reference/2` - application_protocol ### `extract_aos_packets/3` - ccsds_packet_services ### `extract_packets/3` - ccsds_frames ### `extract_packets/4` - ccsds_link_profiles ### `extract_tc_segment/2` - ccsds_tc_services ### `extract_tm_packets/3` - ccsds_packet_services ### `factorial/2` - natural ### `facts/1` - datalog_protocol ### `failed_test_reason//1` - lgtunit_messages ### `falling_factorial/3` - natural ### `false/1` - java_utils_protocol ### `fcube/0` - fcube ### `fecf/2` - ccsds_frame_protocol - ccsds_frames ### `fibonacci/2` - natural ### `field/3` - gravatar ### `field/4` - http_multipart ### `field_part/4` - http_multipart ### `fields/2` - http_multipart - nmea_protocol ### `fields/5` - ieee_754_fields_protocol ### `file/1` - code_metric - dead_code_scanner - entity_diagram(Format) - lgtdocp - wrapper ### `file/2` - code_metric - dead_code_scanner - entity_diagram(Format) - lgtdocp - wrapper ### `file/6` - http_multipart ### `file_exists/1` - osp ### `file_footer/3` - graph_language_protocol ### `file_header/3` - graph_language_protocol ### `file_modification_time/2` - osp ### `file_part/6` - http_multipart ### `file_path_components/2` - url(Representation) ### `file_permission/2` - osp ### `file_score/2` - code_metric ### `file_size/2` - osp ### `file_to_bytes/2` - reader ### `file_to_bytes/3` - reader ### `file_to_chars/2` - reader ### `file_to_chars/3` - reader ### `file_to_codes/2` - reader ### `file_to_codes/3` - reader ### `file_to_terms/2` - reader ### `file_to_terms/3` - reader ### `file_type_extension/2` - logtalk ### `files/1` - diagram(Format) - diagrams(Format) - lgtdocp - wrapper ### `files/2` - diagram(Format) - diagrams(Format) - http_multipart - lgtdocp - wrapper ### `files/3` - diagram(Format) - diagrams(Format) ### `filter/2` - optional(Optional) ### `filter/3` - expected(Expected) - validation(Validation) ### `final/2` - http_websocket_frames ### `final_bearing/3` - geospatial_protocol ### `final_hash_state/2` - hash_state_protocol ### `find/4` - union_find_protocol ### `find/5` - union_find_protocol ### `findall_in_noblock/3` - linda_client ### `findall_in_noblock/4` - linda_client ### `findall_member/4` - metap ### `findall_member/5` - metap ### `findall_rd_noblock/3` - linda_client ### `findall_rd_noblock/4` - linda_client ### `fine/2` - ccsds_cuc(CoarseOctets,FineOctets,Epoch) ### `finish/3` - http_server_core_session ### `finished_by/2` - interval_protocol ### `finishes/2` - interval_protocol ### `finite_binary_rational/4` - ieee_754_fields_protocol ### `first_header_pointer/2` - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `first_significant_component/2` - linear_algebra_protocol ### `first_significant_component/3` - linear_algebra_protocol ### `fisher/3` - sampling_protocol ### `flag_group_chk/1` - flags ### `flag_groups/1` - flags ### `flat_map/2` - expected(Expected) - optional(Optional) - validation(Validation) ### `flatten/1` - expected(Expected) - optional(Optional) - validation(Validation) ### `flatten/2` - json_ld_protocol - listp - varlistp ### `float//1` - number_grammars(Format) ### `flush_all/1` - memcached ### `flush_all/2` - memcached ### `fold_left/4` - metap ### `fold_left_1/3` - metap ### `fold_right/4` - metap ### `fold_right_1/3` - metap ### `fordownto/3` - loopp ### `fordownto/4` - loopp ### `fordownto/5` - loopp ### `foreach/3` - loopp ### `foreach/4` - loopp ### `form_body/2` - rest ### `form_data_body/2` - http_multipart ### `format/1` - ccsds_time_code_protocol ### `format/2` - ccsds_time_codes - ccsds_time_fields - format ### `format/3` - format ### `format_date_time/4` - datep ### `format_entity_score//2` - code_metric ### `format_object/1` - diagram(Format) ### `format_report/1` - mutation_testing ### `format_report/2` - mutation_testing ### `format_report/3` - mutation_testing ### `format_to_atom/3` - term_io_protocol ### `format_to_chars/3` - term_io_protocol ### `format_to_chars/4` - term_io_protocol ### `format_to_codes/3` - term_io_protocol ### `format_to_codes/4` - term_io_protocol ### `formatted_iban/2` - iso_13616_protocol ### `forto/3` - loopp ### `forto/4` - loopp ### `forto/5` - loopp ### `forward/1` - forwarding ### `forward/2` - zipperp ### `forward/3` - zipperp ### `forward_substitution/3` - linear_algebra_protocol ### `fractile/3` - statisticsp ### `frame/2` - open_ai_event_stream ### `frame/3` - json_ld_protocol ### `frame/5` - http_websocket_frames ### `frame_body/2` - stomp ### `frame_command/2` - stomp ### `frame_header/3` - stomp ### `frame_headers/2` - stomp ### `frame_type/2` - ccsds_frame_protocol - ccsds_frames ### `freeze/2` - coroutining ### `frequency_distribution/2` - statisticsp ### `frobenius_norm/2` - linear_algebra_protocol ### `from_expected/2` - validation ### `from_generator/2` - expected - optional - validation ### `from_generator/3` - expected - optional - validation ### `from_generator/4` - expected - validation ### `from_goal/2` - expected - optional - validation ### `from_goal/3` - expected - optional - validation ### `from_goal/4` - expected - validation ### `from_goal_or_throw/2` - optional ### `from_goal_or_throw/3` - optional ### `from_optional/3` - expected - validation ### `from_unix_seconds/2` - ccsds_time_code_protocol ### `frozen/2` - coroutining ### `full_device_path/1` - osp ### `func_test/3` - metagol ### `functional/0` - metagol ### `fund_currency/5` - iso_4217 - iso_4217_protocol ### `game/4` - temporal_pairwise_ranking_dataset_protocol ### `gamma/3` - sampling_protocol ### `gat/4` - memcached ### `gats/5` - memcached ### `gc/2` - http_server_core_session ### `generate/1` - cuid2_protocol - ids(Representation,Bytes) - ksuid_protocol - nanoid_protocol - snowflakeid_protocol - ulid_protocol ### `generate/2` - base32 - base58 - base64 - base64url - base64url_no_padding - base85 - cbor(StringRepresentation) - ccsds_frame_protocol - ccsds_packets(SecondaryHeaderLength) - ccsds_time_code_protocol - geojson_protocol - html - http_websocket_frames - ieee_754_protocol - json_graph_protocol - json_ld_protocol - json_lines_protocol - json_path_protocol - json_pointer_protocol - json_protocol - message_pack(StringRepresentation) - open_api - sarif - toml_protocol - toon_protocol - ulid_protocol - url(Representation) - wkt_wkb_protocol - yaml_protocol ### `generate/3` - avro - ccsds_frame_protocol - ccsds_packets(SecondaryHeaderLength) - ccsds_time_code_protocol - ccsds_time_fields - http_multipart - ieee_754_protocol - protobuf ### `generate/4` - avro - protobuf - sarif ### `generate/8` - ulid_protocol ### `generate_all/2` - yaml_protocol ### `generate_authentication_info/2` - http_digest ### `generate_authorization/2` - http_authenticate - http_digest ### `generate_body/3` - http_core ### `generate_challenge/2` - http_authenticate - http_digest ### `generate_cookie/2` - http_cookies(Representation) ### `generate_fragment/2` - json_pointer_protocol ### `generate_frame/3` - ccsds_link_profiles ### `generate_frames/3` - ccsds_link_profiles ### `generate_headers/2` - http_core ### `generate_idle_packet/4` - ccsds_packetization ### `generate_relative/2` - json_pointer_protocol ### `generate_request/2` - http_core ### `generate_request_line/2` - http_core ### `generate_response/2` - http_core ### `generate_response_headers/2` - http_core ### `generate_set_cookie/4` - http_cookies(Representation) ### `generate_status_line/2` - http_core ### `genint/2` - genint_core ### `gensym/2` - gensym_core ### `geohash_to_int/2` - geohash_protocol ### `geojson_to_json/2` - geojson_protocol ### `geometric/2` - sampling_protocol ### `geometric_mean/2` - statisticsp ### `get/1` - optional(Optional) ### `get/3` - http_client - http_server_core_session - memcached - redis ### `get/4` - http_client - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) - memcached ### `get_field/2` - java_access_protocol ### `get_flag_value/2` - flags ### `get_object/5` - s3_protocol ### `get_object/6` - s3_session(HTTPTransport) ### `get_seed/1` - arbitrary - pseudo_random_protocol ### `getrange/5` - redis ### `gets/4` - memcached ### `gets/5` - memcached ### `git_object_identifier/1` - application_protocol ### `gnu/0` - fcube ### `goal_expansion/2` - expanding ### `gram_matrix/2` - linear_algebra_protocol ### `graph/2` - json_graph_data_protocol ### `graph_coloring/3` - undirected_graph_common ### `graph_footer/5` - graph_language_protocol ### `graph_header/5` - graph_language_protocol ### `ground/1` - termp ### `ground_track/5` - tle_orbits_protocol ### `ground_track/6` - tle_orbits_protocol ### `group/1` - ranking_dataset_protocol ### `group_by_key/2` - pairs ### `group_consecutive_by_key/2` - pairs ### `group_sorted_by_key/2` - pairs ### `grouped_dataset_groups/2` - ranking_dataset_common ### `grouped_dataset_items/2` - ranking_dataset_common ### `grouped_dataset_items/3` - ranking_dataset_common ### `grouped_dataset_summary/2` - ranking_dataset_common ### `guess_all_extensions/2` - mime_types ### `guess_all_extensions/3` - mime_types ### `guess_arity/2` - csv_protocol ### `guess_extension/2` - mime_types ### `guess_extension/3` - mime_types ### `guess_file_type/3` - mime_types ### `guess_file_type/4` - mime_types ### `guess_separator/2` - csv_protocol ### `guess_type/3` - mime_types ### `guess_type/4` - mime_types ### `gumbel/3` - sampling_protocol ### `ha1/4` - http_digest_verifier_protocol ### `halt/0` - logtalk ### `halt/1` - logtalk ### `halt_hook/2` - logtalk ### `hamming/3` - string_distance(Representation) ### `hamming_distance/3` - listp ### `handbook/0` - help ### `handle/2` - http_handler_protocol - http_router - http_websocket_service_handler_protocol ### `handle_open_ai/3` - open_ai_backend_protocol ### `harmonic_mean/2` - statisticsp ### `has_cycle/1` - directed_graph_protocol - undirected_graph_common ### `has_negative_cycle/1` - weighted_graph_protocol ### `has_path/3` - graph_protocol ### `hash/2` - gravatar - hash_protocol ### `haversine_distance/3` - geospatial_protocol ### `hdel/4` - redis ### `head/2` - queuep ### `head/3` - http_client ### `head/4` - http_client - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) ### `head_bucket/3` - s3_protocol ### `head_bucket/4` - s3_session(HTTPTransport) ### `head_object/4` - s3_protocol ### `head_object/5` - s3_session(HTTPTransport) ### `head_pred/1` - metagol ### `header/2` - http_request_protocol - http_response_protocol - jwt - jwt_compact ### `header/3` - http_core ### `header_algorithm/2` - jwt_jwa - open_id_jwks ### `header_key_id/2` - jwt_jwa - open_id_jwks ### `header_value/3` - s3_headers ### `headers/1` - http_request_protocol - http_response_protocol ### `headers/2` - http_core ### `help/0` - help - packs_common ### `help/1` - command_line_option ### `help/2` - command_line_options ### `help/3` - command_line_options ### `hex_bytes/2` - crypto ### `hex_digest/4` - hmac_protocol ### `hex_digest/5` - hmac_protocol ### `hex_digit//1` - number_grammars(Format) ### `hex_digits//1` - number_grammars(Format) ### `hexists/4` - redis ### `hget/4` - redis ### `hgetall/3` - redis ### `hkdf/5` - crypto ### `hkeys/3` - redis ### `hlen/3` - redis ### `hmac_hash/2` - jwt_jwa ### `home/1` - pack_protocol - registry_protocol ### `homepage/1` - application_protocol ### `hotp/5` - otp_protocol ### `hotp_verify/7` - otp_protocol ### `hset/5` - redis ### `hvals/3` - redis ### `hyperedge/4` - json_graph_data_protocol ### `hyperedge/5` - json_graph_data_protocol ### `hypergeometric/4` - sampling_protocol ### `iban/4` - iso_13616_protocol ### `ibk/3` - metagol ### `id/2` - json_rpc ### `identity_matrix/2` - linear_algebra_protocol ### `if_empty/1` - optional(Optional) ### `if_expected/1` - expected(Expected) ### `if_expected_or_else/2` - expected(Expected) ### `if_invalid/1` - validation(Validation) ### `if_present/1` - optional(Optional) ### `if_present_or_else/2` - optional(Optional) ### `if_unexpected/1` - expected(Expected) ### `if_valid/1` - validation(Validation) ### `if_valid_or_else/2` - validation(Validation) ### `in/1` - linda_client ### `in/2` - linda_client ### `in_degree/3` - directed_graph_protocol ### `in_list/2` - linda_client ### `in_list/3` - linda_client ### `in_noblock/1` - linda_client ### `in_noblock/2` - linda_client ### `include/3` - metap ### `incr/3` - redis ### `incr/4` - memcached ### `incrby/4` - redis ### `increase/1` - counter ### `increment/0` - counter ### `increment_counter/1` - counters ### `init/0` - shell(Interpreters) ### `init/2` - subsequences_protocol ### `init1/2` - subsequences_protocol ### `init_log_file/2` - loggingp ### `init_tail/2` - subsequences_protocol ### `init_tails/2` - subsequences_protocol ### `initial_bearing/3` - geospatial_protocol ### `initial_channel_reassembly_state/1` - ccsds_packet_services ### `initial_reassembly_state/1` - ccsds_link_profiles - ccsds_packet_services - ccsds_tc_services ### `initial_state/1` - ccsds_packetization - http_websocket_session(Role,TextRepresentation) - simulated_annealing_protocol ### `initial_temperature/1` - simulated_annealing_protocol ### `initialize/1` - amqp_pool ### `inits/2` - subsequences_protocol ### `inits1/2` - subsequences_protocol ### `inorder/2` - bintree ### `insert/3` - setp ### `insert/4` - dictionaryp - heap_protocol ### `insert_after/3` - zipperp ### `insert_all/3` - heap_protocol - setp ### `insert_aos_packets/4` - ccsds_packet_services ### `insert_before/3` - zipperp ### `insert_in/4` - nested_dictionary_protocol ### `insert_packets/4` - ccsds_frames ### `insert_packets/5` - ccsds_link_profiles ### `insert_tc_segment/3` - ccsds_tc_services ### `insert_tm_packets/4` - ccsds_packet_services ### `insert_zone/2` - ccsds_aos_frames(FrameLength,InsertZoneLength,HasOCF,HasFECF) ### `install/1` - packs ### `install/2` - packs ### `install/3` - packs ### `install/4` - packs ### `installed/0` - packs ### `installed/1` - packs ### `installed/3` - packs ### `installed/4` - packs ### `instance/1` - class_hierarchyp ### `instance/2` - recorded_database_core ### `instances/1` - class_hierarchyp ### `instant_to_utc_date_time/2` - time_scales_protocol ### `int_to_geohash/3` - geohash_protocol ### `integer//1` - number_grammars(Format) ### `integer_to_big_endian_bytes32/2` - hash_common_32 ### `integer_to_big_endian_bytes32/3` - hash_common_32 ### `integer_to_big_endian_bytes64/2` - hash_common_64 ### `integer_to_big_endian_bytes64/3` - hash_common_64 ### `integer_to_little_endian_bytes32/2` - hash_common_32 ### `integer_to_little_endian_bytes32/3` - hash_common_32 ### `internal_error/2` - json_rpc ### `internal_os_path/2` - osp ### `interpolate_great_circle/4` - geospatial_protocol ### `interpolate_rhumb/4` - geospatial_protocol ### `interquartile_range/2` - statisticsp ### `intersect/2` - setp ### `intersection/2` - dictionaryp ### `intersection/3` - dictionaryp - interval_relation_set_protocol - setp ### `intersection/4` - setp ### `interval_string/2` - iso8601 ### `invalid/1` - validation(Validation) ### `invalid_params/2` - json_rpc ### `invalid_request/1` - json_rpc ### `invalids/2` - validated ### `inverse_matrix/2` - linear_algebra_protocol ### `invert_from_cholesky/2` - linear_algebra_protocol ### `invoke/1` - java_access_protocol ### `invoke/2` - java_access_protocol ### `ipv4//1` - ip_grammars(Format) ### `ipv6//1` - ip_grammars(Format) ### `is_absolute_file_name/1` - osp ### `is_acyclic/1` - directed_graph_protocol ### `is_alpha/1` - characterp ### `is_alphanumeric/1` - characterp ### `is_ascii/1` - characterp ### `is_batch/1` - json_rpc ### `is_bin_digit/1` - characterp ### `is_bipartite/1` - graph_protocol ### `is_body/1` - http_multipart ### `is_boosted_request/1` - http_htmx ### `is_clockwise_polygon/1` - geospatial_protocol ### `is_complete/1` - graph_protocol ### `is_connected/1` - unweighted_undirected_graph(Dictionary) - weighted_undirected_graph(Dictionary) ### `is_control/1` - characterp ### `is_cors_request/1` - http_cors ### `is_dec_digit/1` - characterp ### `is_empty/0` - optional(Optional) ### `is_end_of_line/1` - characterp ### `is_error_response/1` - json_rpc ### `is_expected/0` - expected(Expected) ### `is_false/1` - java_utils_protocol ### `is_fragment_request/1` - http_htmx ### `is_frame/1` - http_websocket_frames ### `is_hex_digit/1` - characterp ### `is_history_restore_request/1` - http_htmx ### `is_htmx_request/1` - http_htmx ### `is_invalid/0` - validation(Validation) ### `is_layout/1` - characterp ### `is_letter/1` - characterp ### `is_lower_case/1` - characterp ### `is_message/1` - http_websocket_messages(TextRepresentation) ### `is_newline/1` - characterp ### `is_notification/1` - json_rpc ### `is_null/1` - java_utils_protocol ### `is_object/1` - java_utils_protocol ### `is_octal_digit/1` - characterp ### `is_part/1` - http_multipart ### `is_period/1` - characterp ### `is_prefix_of/2` - subsequences_protocol ### `is_preflight_request/1` - http_cors ### `is_present/0` - optional(Optional) ### `is_punctuation/1` - characterp ### `is_quote/1` - characterp ### `is_request/1` - http_core - json_rpc ### `is_response/1` - http_core - json_rpc ### `is_sparse/1` - graph_protocol ### `is_state/1` - http_websocket_session(Role,TextRepresentation) ### `is_subsequence_of/2` - subsequences_protocol ### `is_suffix_of/2` - subsequences_protocol ### `is_tree/1` - undirected_graph_common ### `is_true/1` - java_utils_protocol ### `is_unexpected/0` - expected(Expected) ### `is_upper_case/1` - characterp ### `is_valid/0` - validation(Validation) ### `is_valid_polygon/1` - geospatial_protocol ### `is_void/1` - java_utils_protocol ### `is_vowel/1` - characterp ### `is_white_space/1` - characterp ### `item/1` - pairwise_measurement_dataset_protocol - pairwise_ranking_dataset_protocol - temporal_pairwise_ranking_dataset_protocol ### `item/2` - ranking_dataset_protocol ### `items/1` - sequence_dataset_protocol - transaction_dataset_protocol ### `iterator_element/2` - java_utils_protocol ### `jaccard_index/3` - string_distance(Representation) ### `jaro/3` - string_distance(Representation) ### `jaro_winkler/3` - string_distance(Representation) ### `job_title/2` - gravatar ### `join/3` - queuep ### `join_all/3` - queuep ### `join_aos_packet_zone/3` - ccsds_packet_services ### `join_packet_zone/4` - ccsds_packet_services ### `json_array_body/2` - rest ### `json_body/2` - rest ### `json_media_descriptor/2` - open_api ### `json_media_descriptor/3` - open_api ### `json_object_body/2` - rest ### `json_request_body_descriptor/4` - open_api ### `json_request_body_descriptor/5` - open_api ### `json_response/4` - rest ### `json_response/5` - rest ### `json_response_descriptor/4` - open_api ### `json_response_descriptor/5` - open_api ### `json_to_geojson/2` - geojson_protocol ### `jump/3` - queuep ### `jump_all/3` - queuep ### `jump_all_block/3` - queuep ### `jwks/3` - open_id - open_id_client ### `k_distinct_subsequence/3` - subsequences_protocol ### `k_distinct_subsequences/3` - subsequences_protocol ### `k_permutation/3` - permutations_protocol ### `k_permutation/4` - permutations_protocol ### `k_permutations/3` - permutations_protocol ### `k_permutations/4` - permutations_protocol ### `key/2` - pairs ### `key_type/2` - jwt_jwa ### `keys/2` - dictionaryp - pairs ### `keys/3` - redis ### `keys_values/3` - pairs ### `keysort/2` - listp ### `kill/1` - process ### `kill/2` - process ### `known_zone_id/1` - tzif_zone_ids ### `kurtosis/2` - statisticsp ### `lambert_azimuthal_equal_area/3` - crs_projections_protocol ### `lambert_azimuthal_equal_area_inverse/3` - crs_projections_protocol ### `language/3` - iso_639_1 - iso_639_protocol ### `language/5` - iso_639_3 - iso_639_protocol ### `language_code/5` - iso_639_2 - iso_639_protocol ### `language_group/2` - iso_639_5 - iso_639_protocol ### `language_object/2` - graph_language_registry ### `last/2` - listp - varlistp ### `leaf/1` - hierarchyp ### `leaf_class/1` - class_hierarchyp ### `leaf_classes/1` - class_hierarchyp ### `leaf_instance/1` - class_hierarchyp ### `leaf_instances/1` - class_hierarchyp ### `leap_effective_date/2` - time_scales_data ### `leap_offset_at_utc_unix/2` - time_scales_data ### `leap_second_date/2` - time_scales_protocol ### `leap_seconds_entries/1` - time_scales_data - time_scales_protocol ### `leap_seconds_source/1` - time_scales_data - time_scales_protocol ### `leap_year/1` - datep - iso8601 ### `learn/0` - metagol_example_protocol ### `learn/1` - metagol_example_protocol ### `learn/2` - anomaly_detector_protocol - classifier_protocol - clusterer_protocol - dimension_reducer_protocol - metagol - ranker_protocol - regressor_protocol ### `learn/3` - anomaly_detector_protocol - classifier_protocol - clusterer_protocol - dimension_reducer_protocol - metagol - ranker_protocol - regressor_protocol - truncated_svd_projection ### `learn_seq/2` - metagol ### `learn_with_timeout/4` - metagol ### `leash/1` - debuggerp ### `leashing/1` - debuggerp ### `least_common_multiple/2` - numberlistp ### `least_squares/3` - linear_algebra_protocol ### `leaves/1` - hierarchyp ### `leaves/2` - unweighted_directed_graph(Dictionary) ### `length/2` - deque_protocol - listp - queuep - varlistp ### `levenshtein/3` - string_distance(Representation) ### `libraries/0` - help ### `libraries/1` - diagram(Format) - diagrams(Format) - lgtdocp ### `libraries/2` - diagram(Format) - diagrams(Format) - lgtdocp ### `libraries/3` - diagram(Format) - diagrams(Format) ### `library/1` - code_metric - dead_code_scanner - diagram(Format) - diagrams(Format) - help - lgtdocp - mutation_testing ### `library/2` - code_metric - dead_code_scanner - diagram(Format) - diagrams(Format) - lgtdocp - mutation_testing ### `library_mutants/2` - mutation_testing ### `library_mutants/3` - mutation_testing ### `library_score/2` - code_metric ### `license/1` - application_protocol - pack_protocol ### `linda/0` - linda_server ### `linda/1` - linda_server ### `linda_client/1` - linda_client ### `linda_client/2` - linda_client ### `linda_timeout/2` - linda_client ### `line_to_bytes/2` - reader ### `line_to_bytes/3` - reader ### `line_to_chars/2` - reader ### `line_to_chars/3` - reader ### `line_to_codes/2` - reader ### `line_to_codes/3` - reader ### `linear_regression/4` - numberlistp ### `lint/0` - packs - registries ### `lint/1` - packs - registries ### `lint/2` - packs ### `list/0` - registries ### `list_buckets/2` - s3_protocol ### `list_buckets/3` - s3_session(HTTPTransport) ### `list_buckets_response/2` - s3_xml ### `list_objects_v2/4` - s3_protocol ### `list_objects_v2/5` - s3_session(HTTPTransport) ### `list_objects_v2_response/2` - s3_xml ### `list_to_array/2` - java_utils_protocol ### `listing/0` - listing ### `listing/1` - listing ### `little_endian_word32/2` - hash_common_32 ### `llen/3` - redis ### `load/1` - mime_types - tzif_protocol ### `load/2` - http_cookie_jar - mime_types - tzif_protocol ### `load_config/1` - subprocess_mutation_hook ### `load_coverage_config/1` - subprocess_coverage_hook ### `load_dut1_override/1` - time_scales_data - time_scales_protocol ### `load_leap_seconds_override/1` - time_scales_data - time_scales_protocol ### `load_program/1` - datalog_protocol ### `loaded_file/1` - logtalk ### `loaded_file_property/2` - logtalk - modules_diagram_support ### `loaded_files_topological_sort/1` - logtalk ### `loaded_files_topological_sort/2` - logtalk ### `loaded_pack/3` - packs ### `loaded_pack_dependency/6` - packs ### `loaded_pack_file/4` - packs ### `loader_file/1` - application_protocol ### `local_abbreviation/2` - tzif_protocol ### `local_abbreviation/3` - tzif_protocol ### `local_abbreviation/4` - tzif_protocol ### `local_abbreviation_reified/2` - tzif_protocol ### `local_abbreviation_reified/3` - tzif_protocol ### `local_abbreviation_reified/4` - tzif_protocol ### `local_abbreviation_with_resolution/3` - tzif_protocol ### `local_abbreviation_with_resolution/4` - tzif_protocol ### `local_abbreviation_with_resolution/5` - tzif_protocol ### `local_daylight_saving_time/2` - tzif_protocol ### `local_daylight_saving_time/3` - tzif_protocol ### `local_daylight_saving_time/4` - tzif_protocol ### `local_daylight_saving_time_reified/2` - tzif_protocol ### `local_daylight_saving_time_reified/3` - tzif_protocol ### `local_daylight_saving_time_reified/4` - tzif_protocol ### `local_daylight_saving_time_with_resolution/3` - tzif_protocol ### `local_daylight_saving_time_with_resolution/4` - tzif_protocol ### `local_daylight_saving_time_with_resolution/5` - tzif_protocol ### `local_offset/2` - tzif_protocol ### `local_offset/3` - tzif_protocol ### `local_offset/4` - tzif_protocol ### `local_offset_reified/2` - tzif_protocol ### `local_offset_reified/3` - tzif_protocol ### `local_offset_reified/4` - tzif_protocol ### `local_offset_with_resolution/3` - tzif_protocol ### `local_offset_with_resolution/4` - tzif_protocol ### `local_offset_with_resolution/5` - tzif_protocol ### `local_tangent_plane/3` - crs_projections_protocol ### `local_tangent_plane_inverse/3` - crs_projections_protocol ### `local_time_type/2` - tzif_protocol ### `local_time_type/3` - tzif_protocol ### `local_time_type/4` - tzif_protocol ### `local_time_type_reified/2` - tzif_protocol ### `local_time_type_reified/3` - tzif_protocol ### `local_time_type_reified/4` - tzif_protocol ### `local_time_type_with_resolution/3` - tzif_protocol ### `local_time_type_with_resolution/4` - tzif_protocol ### `local_time_type_with_resolution/5` - tzif_protocol ### `local_to_utc/3` - datep ### `local_to_utc_tz/3` - dates_tz_protocol ### `local_to_utc_tz_with_resolution/4` - dates_tz_protocol ### `location/2` - gravatar ### `locked_pairs/2` - ranked_pairs ### `log/3` - debuggerp ### `log_event/2` - loggingp ### `log_file/2` - loggingp ### `logging/1` - loggingp ### `logging/3` - debuggerp ### `logistic/3` - sampling_protocol ### `lognormal/3` - sampling_protocol ### `logout_url/4` - open_id - open_id_logout ### `logseries/2` - sampling_protocol ### `logtalk_packs/0` - packs_common ### `logtalk_packs/1` - packs_common ### `long_flags/1` - command_line_option ### `longest_common_increasing_subsequence/3` - subsequences_protocol ### `longest_common_subsequence/3` - string_distance(Representation) - subsequences_protocol ### `longest_common_subsequence_length/3` - string_distance(Representation) ### `longest_common_substring/3` - string_distance(Representation) ### `longest_decreasing_subsequence/2` - subsequences_protocol ### `longest_increasing_subsequence/2` - subsequences_protocol ### `longest_repeating_subsequence/2` - subsequences_protocol ### `lookup/2` - dictionaryp ### `lookup/3` - dictionaryp ### `lookup/4` - dictionaryp ### `lookup_in/3` - nested_dictionary_protocol ### `lower_triangular_part/2` - linear_algebra_protocol ### `lower_triangular_part/3` - linear_algebra_protocol ### `lower_upper/2` - characterp ### `lpop/3` - redis ### `lpush/4` - redis ### `lrange/5` - redis ### `lrem/5` - redis ### `ltrim/5` - redis ### `lucas/2` - natural ### `magic/2` - magic ### `magicise/4` - magic ### `make_directory/1` - osp ### `make_directory_path/1` - osp ### `make_set/3` - union_find_protocol ### `man/1` - help ### `manhattan_distance/3` - numberlistp ### `manhattan_norm/2` - numberlistp ### `map/2` - deque_protocol - dictionaryp - expected(Expected) - metap - optional(Optional) - queuep - validation(Validation) ### `map/3` - deque_protocol - dictionaryp - metap - pairs - queuep - validated ### `map/4` - metap - validated ### `map/5` - metap ### `map/6` - metap ### `map/7` - metap ### `map/8` - metap ### `map_both/3` - expected(Expected) - validation(Validation) ### `map_catching/2` - expected(Expected) - validation(Validation) ### `map_element/2` - java_utils_protocol ### `map_id/2` - ccsds_tc_services ### `map_invalid/2` - validation(Validation) ### `map_or_else/3` - expected(Expected) - optional(Optional) - validation(Validation) ### `map_reduce/5` - metap ### `map_unexpected/2` - expected(Expected) ### `mask32/1` - hash_common_32 ### `mask64/1` - hash_common_64 ### `master_channel_frame_count/2` - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `materialize/0` - datalog_protocol ### `matrix_column/3` - linear_algebra_protocol ### `matrix_column_means/2` - linear_algebra_protocol ### `matrix_diagonal/2` - linear_algebra_protocol ### `matrix_diagonal/3` - linear_algebra_protocol ### `matrix_matrix_product/3` - linear_algebra_protocol ### `matrix_rank/2` - linear_algebra_protocol ### `matrix_rank/3` - linear_algebra_protocol ### `matrix_row/3` - linear_algebra_protocol ### `matrix_row_means/2` - linear_algebra_protocol ### `matrix_trace/2` - linear_algebra_protocol ### `matrix_value/4` - linear_algebra_protocol ### `matrix_vector_product/3` - linear_algebra_protocol ### `max/2` - listp - numberlistp - statisticsp ### `max/3` - dictionaryp ### `max_clauses/1` - metagol ### `max_inv_preds/1` - metagol ### `max_path/5` - graph_protocol ### `max_size/1` - arbitrary ### `max_tree/3` - weighted_undirected_graph(Dictionary) ### `maximal_cliques/2` - undirected_graph_common ### `maximum_cliques/2` - undirected_graph_common ### `maybe/0` - random_protocol ### `maybe/1` - random_protocol ### `maybe/2` - random_protocol ### `maybe_call/1` - random_protocol ### `maybe_call/2` - random_protocol ### `mean_center/2` - geospatial_protocol ### `mean_deviation/2` - statisticsp ### `mean_squared_error/3` - statisticsp ### `measurement/4` - pairwise_measurement_dataset_protocol ### `media_type/2` - http_multipart ### `media_types/1` - http_body_codec_protocol ### `median/2` - numberlistp - statisticsp ### `median_deviation/2` - statisticsp ### `meets/2` - interval_protocol ### `member/2` - interval_relation_set_protocol - listp - random_protocol - setp ### `memberchk/2` - listp - setp - varlistp ### `merge/3` - heap_protocol ### `merged_options/2` - http_websocket_service_loop_options - http_websocket_session_read_options - http_websocket_session_write_options ### `message/3` - http_websocket_messages(TextRepresentation) ### `message_body/2` - amqp ### `message_delivery_tag/2` - amqp ### `message_exchange/2` - amqp ### `message_hook/4` - logtalk ### `message_prefix_file/6` - logtalk ### `message_prefix_stream/4` - logtalk ### `message_properties/2` - amqp ### `message_property/3` - amqp ### `message_routing_key/2` - amqp ### `message_tokens//2` - logtalk ### `met_by/2` - interval_protocol ### `meta/1` - command_line_option ### `meta_type/3` - type ### `metaphone/2` - string_distance(Representation) ### `metaphone_match/2` - string_distance(Representation) ### `metarule/6` - metagol ### `metarule_next_id/1` - metagol ### `method/1` - http_request_protocol ### `method/2` - http_core - json_rpc ### `method_not_found/2` - json_rpc ### `mget/3` - memcached - redis ### `mibenum/1` - character_set_protocol ### `midpoint/3` - geospatial_protocol ### `milliseconds/2` - ccsds_cds(DaySegmentOctets,SubmillisecondOctets,Epoch) ### `min/2` - listp - numberlistp - statisticsp ### `min/3` - dictionaryp ### `min_clauses/1` - metagol ### `min_distances/3` - graph_protocol ### `min_max/3` - numberlistp - statisticsp ### `min_max_normalization/2` - statisticsp ### `min_path/5` - graph_protocol ### `min_path_bellman_ford/5` - weighted_graph_protocol ### `min_paths/3` - weighted_directed_graph(Dictionary) ### `min_predecessors/3` - graph_protocol ### `min_tree/3` - weighted_undirected_graph(Dictionary) ### `mine/2` - pattern_miner_protocol ### `mine/3` - pattern_miner_protocol ### `minimum_enclosing_circle/3` - geospatial_protocol ### `minkowski_distance/4` - numberlistp ### `modes/2` - numberlistp - statisticsp ### `module_property/2` - modules_diagram_support ### `monitor/1` - event_registryp ### `monitor/4` - event_registryp ### `monitor_activated/0` - monitorp ### `monitored/1` - event_registryp ### `monitors/1` - event_registryp ### `month/2` - ccsds_ccs(CalendarVariant,FractionOctets) ### `month_weekday_date/5` - datep ### `mset/3` - redis ### `msort/2` - listp ### `msort/3` - listp ### `mul32/3` - hash_common_32 ### `mul64/3` - hash_common_64 ### `multinomial/2` - natural ### `multiset/3` - multisets_protocol ### `multiset/4` - multisets_protocol ### `multiset_index/4` - multisets_protocol ### `multiset_index/5` - multisets_protocol ### `multisets/3` - multisets_protocol ### `multisets/4` - multisets_protocol ### `mutation/2` - mutator_protocol ### `mutation/3` - mutations - mutations_store ### `nack/3` - stomp ### `name/1` - application_protocol - character_set_protocol - command_line_option - pack_protocol - registry_protocol ### `name_of_day/3` - datep ### `name_of_month/3` - datep ### `nan_kind/2` - ieee_754_fields_protocol ### `nan_payload/2` - ieee_754_fields_protocol ### `nan_representation/1` - ieee_754_protocol ### `natural//1` - number_grammars(Format) ### `nearest_coordinate/5` - geospatial_protocol ### `nearest_point_on_polyline/4` - geospatial_protocol ### `nearest_point_on_segment/4` - geospatial_protocol ### `neighbor_state/2` - simulated_annealing_protocol ### `neighbor_state/3` - simulated_annealing_protocol ### `neighbors/2` - geohash_protocol ### `neighbors/3` - graph_protocol ### `neighbors_bits/3` - geohash_protocol ### `neighbors_int/3` - geohash_protocol ### `network/1` - interval_constraint_network_protocol ### `new/1` - graph_protocol - java_access_protocol - nested_dictionary_protocol - streamvars - termp ### `new/2` - graph_protocol - interval_constraint_network_protocol - java_access_protocol - streamvars - union_find_protocol ### `new/3` - graph_protocol - interval_protocol ### `new_hash_state/1` - hash_state_protocol ### `new_line//0` - blank_grammars(Format) ### `new_lines//0` - blank_grammars(Format) ### `new_matrix/4` - linear_algebra_protocol ### `new_vector/3` - linear_algebra_protocol ### `new_vector_like/2` - linear_algebra_protocol ### `next/2` - zipperp ### `next/3` - zipperp ### `next/4` - dictionaryp ### `next_arrangement/3` - arrangements_protocol ### `next_cartesian_tuple/3` - cartesian_products_protocol ### `next_combination/3` - combinations_protocol ### `next_derangement/3` - derangements_protocol ### `next_multiset/3` - multisets_protocol ### `next_partition/3` - partitions_protocol ### `next_partition/4` - partitions_protocol ### `next_permutation/2` - permutations_protocol ### `nextto/3` - listp - varlistp ### `no_content_response/2` - rest ### `node/3` - json_graph_data_protocol ### `node/7` - graph_language_protocol ### `nodebug/0` - debuggerp ### `nodes/2` - interval_constraint_network_protocol ### `nodes/3` - json_path_protocol ### `nolog/3` - debuggerp ### `nologall/0` - debuggerp ### `non_blank//1` - blank_grammars(Format) ### `non_blanks//1` - blank_grammars(Format) ### `nonempty_subsequence/2` - subsequences_protocol ### `nonempty_subsequences/2` - subsequences_protocol ### `normal/3` - sampling_protocol ### `normal_element/2` - html ### `normalize/2` - interval_relation_set_protocol - url(Representation) ### `normalize_cookie_attributes/2` - http_cookies(Representation) ### `normalize_coordinate/2` - geospatial_protocol ### `normalize_date_time/2` - datep ### `normalize_polygon_orientation/3` - geospatial_protocol ### `normalize_range/2` - numberlistp ### `normalize_range/4` - numberlistp ### `normalize_scalar/2` - numberlistp ### `normalize_unit/2` - numberlistp ### `normalize_vector/2` - linear_algebra_protocol ### `normalize_vector/3` - linear_algebra_protocol ### `nospy/1` - debuggerp ### `nospy/3` - debuggerp ### `nospy/4` - debuggerp ### `nospyall/0` - debuggerp ### `not64/2` - hash_common_64 ### `note/2` - registry_protocol ### `note/3` - pack_protocol ### `notification/2` - json_rpc ### `notification/3` - json_rpc ### `notrace/0` - debuggerp ### `now/3` - timep ### `nth0/3` - listp - varlistp ### `nth0/4` - listp - varlistp ### `nth1/3` - listp - varlistp ### `nth1/4` - listp - varlistp ### `nth_arrangement/4` - arrangements_protocol ### `nth_arrangement/5` - arrangements_protocol ### `nth_cartesian_tuple/3` - cartesian_products_protocol ### `nth_cartesian_tuple/4` - cartesian_products_protocol ### `nth_combination/4` - combinations_protocol ### `nth_combination/5` - combinations_protocol ### `nth_derangement/3` - derangements_protocol ### `nth_derangement/4` - derangements_protocol ### `nth_distinct_arrangement/4` - arrangements_protocol ### `nth_distinct_cartesian_tuple/3` - cartesian_products_protocol ### `nth_distinct_combination/4` - combinations_protocol ### `nth_distinct_derangement/3` - derangements_protocol ### `nth_distinct_multiset/4` - multisets_protocol ### `nth_distinct_partition/3` - partitions_protocol ### `nth_distinct_partition/4` - partitions_protocol ### `nth_distinct_partition/5` - partitions_protocol ### `nth_distinct_permutation/3` - permutations_protocol ### `nth_multiset/4` - multisets_protocol ### `nth_multiset/5` - multisets_protocol ### `nth_partition/3` - partitions_protocol ### `nth_partition/4` - partitions_protocol ### `nth_partition/5` - partitions_protocol ### `nth_permutation/3` - permutations_protocol ### `nth_permutation/4` - permutations_protocol ### `null/1` - java_utils_protocol ### `null_device_path/1` - osp ### `null_space/2` - linear_algebra_protocol ### `null_space/3` - linear_algebra_protocol ### `number//1` - number_grammars(Format) ### `number_of_edges/2` - graph_protocol ### `number_of_tests/1` - lgtunit ### `number_of_vertices/2` - graph_protocol ### `number_string/2` - string(Representation) ### `numbervars/1` - termp ### `numbervars/3` - termp ### `occurrences/2` - listp ### `occurrences/3` - listp ### `occurs/2` - termp ### `ocf/2` - ccsds_frame_protocol - ccsds_frames ### `ocf_flag/2` - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `of/2` - optional ### `of_expected/2` - expected ### `of_invalid/2` - validation ### `of_invalids/2` - validation ### `of_unexpected/2` - expected ### `of_valid/2` - validation ### `offset/2` - tzif_protocol ### `offset/3` - time_scales_protocol - tzif_protocol ### `offset/4` - tzif_protocol ### `one_or_more//0` - sequence_grammars ### `one_or_more//1` - sequence_grammars ### `one_or_more//2` - sequence_grammars ### `opcode/2` - http_websocket_frames ### `open/1` - http_client_session(HTTPTransport) - http_cookie_jar - http_server_core_session - http_websocket_service_registry - s3_session(HTTPTransport) ### `open/2` - http_client_session(HTTPTransport) - http_cookie_jar - http_server_core_session - http_websocket - s3_session(HTTPTransport) ### `open/3` - http_client_digest_session(HTTPTransport) - http_server - http_websocket ### `open/4` - http_client_digest_session(HTTPTransport) - http_server - http_websocket_client_service(HTTPTransport) ### `open/5` - http_websocket_client_service(HTTPTransport) ### `open_api_bad_request_response/1` - http_parameters ### `open_api_parameters/2` - http_parameters ### `open_api_request_body/3` - http_parameters ### `open_connection/4` - http_transport_protocol ### `open_connection_pool/4` - http_transport_protocol ### `open_listener/4` - http_transport_protocol ### `open_session/4` - http_websocket ### `open_session/5` - http_websocket ### `open_websocket/4` - http_client ### `operating_system_machine/1` - osp ### `operating_system_name/1` - osp ### `operating_system_release/1` - osp ### `operating_system_type/1` - osp ### `operation/3` - open_api ### `operation/8` - open_ai_catalog ### `operation_count/1` - open_ai - open_ai_catalog ### `operation_properties/2` - open_ai_catalog ### `operation_url/4` - open_ai_client ### `operations/1` - http_router - open_api_provider_protocol ### `option/2` - options_protocol ### `option/3` - options_protocol ### `or/2` - expected(Expected) - optional(Optional) - validation(Validation) ### `or64/3` - hash_common_64 ### `or_else/2` - expected(Expected) - optional(Optional) - validation(Validation) ### `or_else_call/2` - expected(Expected) - optional(Optional) - validation(Validation) ### `or_else_fail/1` - expected(Expected) - optional(Optional) - validation(Validation) ### `or_else_get/2` - expected(Expected) - optional(Optional) - validation(Validation) ### `or_else_throw/1` - expected(Expected) - validation(Validation) ### `or_else_throw/2` - expected(Expected) - optional(Optional) - validation(Validation) ### `order/1` - ieee_754_fields_protocol - ieee_754_protocol ### `originator/1` - application_protocol ### `orphaned/0` - packs ### `orphaned/2` - packs ### `out/1` - linda_client ### `out/2` - linda_client ### `out_degree/3` - directed_graph_protocol ### `outdated/0` - packs ### `outdated/1` - packs ### `outdated/2` - packs ### `outdated/4` - packs ### `outdated/5` - packs ### `outer_product/3` - linear_algebra_protocol ### `output_file_name/2` - graph_language_protocol ### `output_schema/2` - mcp_tool_protocol ### `overlapped_by/2` - interval_protocol ### `overlaps/2` - interval_protocol ### `pack_dependency/6` - packs ### `pack_metadata/4` - packs ### `pack_object/3` - packs ### `pack_property/4` - packs ### `package/1` - application_protocol ### `packet_order_flag/2` - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `packetize_aos_frames/7` - ccsds_packetization ### `packetize_aos_frames/8` - ccsds_packetization ### `packetize_aos_packets/6` - ccsds_packetization ### `packetize_aos_packets/7` - ccsds_packetization ### `packetize_tm_frames/7` - ccsds_packetization ### `packetize_tm_frames/8` - ccsds_packetization ### `packetize_tm_packets/6` - ccsds_packetization ### `packetize_tm_packets/7` - ccsds_packetization ### `packets/2` - ccsds_packet_services ### `pad_md/4` - hash_common_32 ### `pad_md_tail/3` - hash_common_64 ### `pad_md_tail/5` - hash_common_32 ### `page_fragment_reply/4` - http_htmx ### `page_fragment_reply/5` - http_htmx ### `pairwise_dataset_connected_components/2` - ranking_dataset_common ### `pairwise_dataset_declared_items/2` - ranking_dataset_common ### `pairwise_dataset_items/2` - ranking_dataset_common ### `pairwise_dataset_matchups/2` - ranking_dataset_common ### `pairwise_dataset_preferences/2` - ranking_dataset_common ### `pairwise_dataset_summary/2` - ranking_dataset_common ### `pairwise_dataset_win_totals/2` - ranking_dataset_common ### `pairwise_measurement_dataset_connected_components/2` - ranking_dataset_common ### `pairwise_measurement_dataset_declared_items/2` - ranking_dataset_common ### `pairwise_measurement_dataset_items/2` - ranking_dataset_common ### `pairwise_measurement_dataset_measurements/2` - ranking_dataset_common ### `pairwise_measurement_dataset_summary/2` - ranking_dataset_common ### `parameter/3` - http_parameters ### `parameters/3` - http_parameters ### `params/2` - json_rpc ### `parent/1` - proto_hierarchyp ### `parent/2` - geohash_protocol ### `parenthesis/2` - characterp ### `parents/1` - proto_hierarchyp ### `parse/2` - avro - base32 - base58 - base64 - base64url - base64url_no_padding - base85 - cbor(StringRepresentation) - ccsds_frame_protocol - ccsds_packets(SecondaryHeaderLength) - ccsds_time_code_protocol - geojson_protocol - http_websocket_frames - ieee_754_protocol - json_graph_protocol - json_ld_protocol - json_lines_protocol - json_path_protocol - json_pointer_protocol - json_protocol - json_schema_protocol - message_pack(StringRepresentation) - nmea_protocol - open_api - protobuf - tle_orbits_protocol - toml_protocol - toon_protocol - url(Representation) - wkt_wkb_protocol - xml - yaml_protocol ### `parse/3` - avro - ccsds_time_fields - nmea_protocol - protobuf - url(Representation) - xml ### `parse/4` - command_line_options - http_multipart ### `parse/5` - command_line_options ### `parse_all/2` - yaml_protocol ### `parse_authentication_info/2` - http_digest ### `parse_authorization/2` - http_authenticate - http_digest ### `parse_body/4` - http_core ### `parse_challenge/2` - http_authenticate - http_digest ### `parse_cookie/2` - http_cookies(Representation) ### `parse_domain/2` - pddl ### `parse_domain/3` - pddl ### `parse_error/1` - json_rpc ### `parse_fragment/2` - json_pointer_protocol ### `parse_frame/3` - ccsds_link_profiles ### `parse_frames/3` - ccsds_link_profiles ### `parse_headers/2` - http_core ### `parse_lines/4` - tle_orbits_protocol ### `parse_problem/2` - pddl ### `parse_problem/3` - pddl ### `parse_relative/2` - json_pointer_protocol ### `parse_request/2` - http_core ### `parse_request_line/2` - http_core ### `parse_response/2` - http_core ### `parse_set_cookie/4` - http_cookies(Representation) ### `parse_status_line/2` - http_core ### `part/4` - http_multipart ### `part_body/2` - http_multipart ### `part_headers/2` - http_multipart ### `part_properties/2` - http_multipart ### `partial_map/4` - rbtree ### `partition/2` - partitions_protocol ### `partition/3` - either - partitions_protocol - validated ### `partition/4` - metap - partitions_protocol ### `partition/5` - listp ### `partition/6` - metap ### `partition_index/3` - partitions_protocol ### `partition_index/4` - partitions_protocol ### `partition_index/5` - partitions_protocol ### `partition_number/2` - natural ### `partitions/2` - partitions_protocol ### `partitions/3` - partitions_protocol ### `partitions/4` - partitions_protocol ### `parts/2` - http_multipart ### `password_hash/4` - crypto ### `password_hash_needs_rehash/3` - crypto ### `patch/4` - http_client ### `patch/5` - http_client - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) ### `path/3` - graph_protocol ### `path_concat/3` - osp ### `path_consistency/2` - interval_constraint_network_protocol ### `path_parameter/3` - rest ### `paths/3` - json_path_protocol ### `pattern_miner_options/2` - pattern_miner_protocol ### `payload/2` - http_websocket_frames - http_websocket_messages(TextRepresentation) ### `payload_hash/2` - s3_signing ### `pbkdf2/6` - crypto ### `peek_algorithm/2` - jwt ### `peek_back/2` - deque_protocol ### `peek_front/2` - deque_protocol ### `peek_key_id/2` - jwt ### `pending_data/2` - ccsds_packet_services ### `pending_fragments/2` - ccsds_link_profiles - ccsds_packet_services - ccsds_tc_services ### `pending_packets/2` - ccsds_packetization ### `percentile/3` - statisticsp ### `period/1` - temporal_pairwise_ranking_dataset_protocol ### `permutation/2` - listp - permutations_protocol - random_protocol - varlistp ### `permutation/3` - permutations_protocol ### `permutation_index/3` - permutations_protocol ### `permutation_index/4` - permutations_protocol ### `permutations/2` - permutations_protocol ### `permutations/3` - permutations_protocol ### `persist/3` - redis ### `pid/1` - osp ### `pin/0` - packs_common ### `pin/1` - packs_common ### `pinned/1` - packs_common ### `plus/3` - integer ### `point_in_polygon/2` - geospatial_protocol ### `point_to_polyline_distance/3` - geospatial_protocol ### `poisson/2` - sampling_protocol ### `polygon_area/2` - geospatial_protocol ### `polygon_bounding_box/2` - geospatial_protocol ### `polygon_centroid/2` - geospatial_protocol ### `polygon_covering/4` - geohash_protocol ### `polygon_orientation/2` - geospatial_protocol ### `polygon_perimeter/2` - geospatial_protocol ### `polygon_perimeter/3` - geospatial_protocol ### `polygons_intersect/2` - geospatial_protocol ### `polyline_covering/4` - geohash_protocol ### `polyline_length/2` - geospatial_protocol ### `polyline_length/3` - geospatial_protocol ### `polyline_resample/3` - geospatial_protocol ### `polyline_simplify/3` - geospatial_protocol ### `polyline_split_at_distance/4` - geospatial_protocol ### `pop_back/3` - deque_protocol ### `pop_front/3` - deque_protocol ### `port/5` - ports_profiler ### `portray_clause/1` - listing ### `possible/4` - interval_constraint_network_protocol ### `post/4` - http_client ### `post/5` - http_client - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) ### `postorder/2` - bintree ### `power/2` - sampling_protocol ### `power_sequence/4` - integer ### `power_set/2` - subsequences_protocol ### `powerset/2` - setp ### `pp/1` - xml ### `pprint/1` - metagol ### `precision/1` - ieee_754_fields_protocol - ieee_754_protocol ### `precision/3` - geohash_protocol ### `predicate/1` - caller_diagram(Format) ### `predicate/2` - caller_diagram(Format) - dead_code_scanner - mutation_testing ### `predicate/3` - dead_code_scanner - mutation_testing ### `predicate_info_pair_score_hook/4` - doc_metric ### `predicate_info_score_hook/3` - doc_metric ### `predicate_mode_score_hook/3` - doc_metric ### `predicate_mode_score_hook/5` - doc_metric ### `predicate_mutants/3` - mutation_testing ### `predicate_mutants/4` - mutation_testing ### `predicate_stratum/3` - datalog_protocol ### `predicates/2` - dead_code_scanner ### `predicates/3` - dead_code_scanner ### `predict/3` - anomaly_detector_protocol - classifier_protocol - regressor_protocol ### `predict/4` - anomaly_detector_protocol - knn_classifier - nearest_centroid_classifier ### `predict_distribution/3` - bayesian_ridge_regression - gaussian_process_regression ### `predict_probabilities/3` - probabilistic_classifier_protocol ### `predict_probabilities/4` - knn_classifier - nearest_centroid_classifier ### `predict_scores/3` - lda_classifier - qda_classifier ### `preference/3` - pairwise_ranking_dataset_protocol ### `preferred_mime_name/1` - character_set_protocol ### `prefix/0` - packs_common ### `prefix/1` - packs_common ### `prefix/2` - listp - varlistp ### `prefix/3` - listp ### `prefix_data/2` - ccsds_packet_services ### `preflight_response/3` - http_cors ### `preorder/2` - bintree ### `prepend/3` - memcached ### `presigned_get_object/4` - s3_protocol ### `presigned_get_object/5` - s3_session(HTTPTransport) ### `presigned_post_object/4` - s3_protocol ### `presigned_post_object/5` - s3_session(HTTPTransport) ### `presigned_put_object/4` - s3_protocol ### `presigned_put_object/5` - s3_session(HTTPTransport) ### `presigned_query_pairs/7` - s3_signing ### `previous/2` - zipperp ### `previous/3` - zipperp ### `previous/4` - dictionaryp ### `previous_arrangement/3` - arrangements_protocol ### `previous_cartesian_tuple/3` - cartesian_products_protocol ### `previous_combination/3` - combinations_protocol ### `previous_derangement/3` - derangements_protocol ### `previous_multiset/3` - multisets_protocol ### `previous_partition/3` - partitions_protocol ### `previous_partition/4` - partitions_protocol ### `previous_permutation/2` - permutations_protocol ### `primary_office_bic/1` - iso_9362_protocol ### `print_anomaly_detector/1` - anomaly_detector_protocol ### `print_classifier/1` - classifier_protocol ### `print_clusterer/1` - clusterer_protocol ### `print_dimension_reducer/1` - dimension_reducer_protocol ### `print_flags/0` - flags - flags_validator ### `print_flags/1` - flags ### `print_message/3` - logtalk ### `print_message_token/4` - logtalk ### `print_message_tokens/3` - logtalk ### `print_pattern_miner/1` - pattern_miner_protocol ### `print_ranker/1` - ranker_protocol ### `print_regressor/1` - regressor_protocol ### `problem_json_schema/1` - open_api ### `problem_response/6` - rest ### `problem_response_descriptor/3` - open_api ### `product/2` - numberlistp - statisticsp ### `product/3` - setp ### `profile/2` - gravatar ### `profile/3` - gravatar ### `profile_path/2` - gravatar_api ### `profile_response/3` - gravatar ### `profile_url/2` - gravatar ### `program_to_clauses/2` - metagol ### `progress/5` - simulated_annealing_protocol ### `prompt/2` - http_htmx ### `prompt_get/3` - mcp_prompt_protocol ### `prompts/1` - mcp_prompt_protocol ### `pronouns/2` - gravatar ### `propagate/2` - interval_constraint_network_protocol ### `propagate/3` - interval_constraint_network_protocol - tle_orbits_protocol ### `propagate/4` - tle_orbits_protocol ### `propagate/5` - tle_orbits_protocol ### `propagate_state/4` - tle_orbits_protocol ### `propagate_state/5` - tle_orbits_protocol ### `propagation_triple/2` - interval_constraint_network_protocol ### `propagation_triples/2` - interval_constraint_network_protocol ### `proper_prefix/2` - listp ### `proper_prefix/3` - listp ### `proper_subsequence/2` - subsequences_protocol ### `proper_suffix/2` - listp ### `proper_suffix/3` - listp ### `properties/2` - http_websocket_frames ### `property/1` - application_protocol - http_request_protocol - http_response_protocol ### `property/2` - http_core - http_websocket - http_websocket_frames ### `property/3` - open_id_discovery ### `protect_request/4` - http_authenticate - http_digest ### `prove/2` - interpreterp ### `prove/3` - interpreterp ### `provider/3` - open_id_discovery ### `provider/4` - open_id_discovery ### `provides/2` - registries ### `prune/3` - c45_classifier ### `prune/5` - c45_classifier ### `pseudo_inverse/2` - linear_algebra_protocol ### `pseudo_inverse/3` - linear_algebra_protocol ### `public_key_pem/2` - jwt_der - jwt_jwk - open_id_der ### `push_back/3` - deque_protocol ### `push_front/3` - deque_protocol ### `put/4` - http_client ### `put/5` - http_client - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) ### `put_object/6` - s3_protocol ### `put_object/7` - s3_session(HTTPTransport) ### `qr_decomposition/3` - linear_algebra_protocol ### `quartiles/4` - statisticsp ### `query/1` - datalog_protocol ### `query/2` - datalog_protocol ### `query/3` - json_path_protocol ### `query/4` - http_client ### `query/5` - http_client ### `query_parameter/3` - rest ### `question_hook/6` - logtalk ### `question_prompt_stream/4` - logtalk ### `queue_bind/4` - amqp ### `queue_declare/3` - amqp ### `queue_delete/3` - amqp ### `queue_purge/2` - amqp ### `queue_unbind/4` - amqp ### `quick_check/1` - lgtunit ### `quick_check/2` - lgtunit ### `quick_check/3` - lgtunit ### `random/1` - random_protocol ### `random/3` - random_protocol ### `random_arrangement/3` - arrangements_protocol ### `random_below/2` - crypto ### `random_bytes/2` - crypto ### `random_cartesian_tuple/2` - cartesian_products_protocol ### `random_combination/3` - combinations_protocol ### `random_derangement/2` - derangements_protocol ### `random_distinct_arrangement/3` - arrangements_protocol ### `random_distinct_cartesian_tuple/2` - cartesian_products_protocol ### `random_distinct_combination/3` - combinations_protocol ### `random_distinct_derangement/2` - derangements_protocol ### `random_distinct_multiset/3` - multisets_protocol ### `random_distinct_partition/2` - partitions_protocol ### `random_distinct_partition/3` - partitions_protocol ### `random_distinct_permutation/2` - permutations_protocol ### `random_multiset/3` - multisets_protocol ### `random_node/1` - uuid_protocol ### `random_partition/2` - partitions_protocol ### `random_partition/3` - partitions_protocol ### `random_permutation/2` - permutations_protocol ### `random_subsequence/2` - subsequences_protocol ### `random_tree/1` - benchmark_generators ### `randomize/1` - fast_random(Algorithm) - random(Algorithm) ### `randseq/4` - random_protocol ### `randset/4` - random_protocol ### `range/2` - statisticsp ### `rank/3` - ranker_protocol ### `rank_correlation/3` - statisticsp ### `ranker_options/2` - ranker_protocol ### `rd/1` - linda_client ### `rd/2` - linda_client ### `rd_list/2` - linda_client ### `rd_list/3` - linda_client ### `rd_noblock/1` - linda_client ### `rd_noblock/2` - linda_client ### `rdirectories/1` - lgtdocp ### `rdirectories/2` - lgtdocp ### `rdirectory/1` - code_metric - dead_code_scanner - diagram(Format) - diagrams(Format) - lgtdocp - wrapper ### `rdirectory/2` - code_metric - dead_code_scanner - diagram(Format) - diagrams(Format) - lgtdocp - wrapper ### `rdirectory/3` - diagram(Format) - diagrams(Format) ### `rdirectory_score/2` - code_metric ### `reachable/3` - graph_protocol ### `read_file/2` - csv_protocol - read_file - tsv_protocol ### `read_file/3` - csv_protocol - tsv_protocol ### `read_file_by_line/2` - csv_protocol - tsv_protocol ### `read_file_by_line/3` - csv_protocol - tsv_protocol ### `read_frame/2` - http_websocket_frames ### `read_frame/3` - http_websocket_frames ### `read_framed_message/2` - json_rpc ### `read_from_atom/2` - term_io_protocol ### `read_from_chars/2` - term_io_protocol ### `read_from_codes/2` - term_io_protocol ### `read_message/2` - http_websocket_messages(TextRepresentation) - json_rpc ### `read_message/4` - http_websocket_session(Role,TextRepresentation) ### `read_message/5` - http_websocket_session(Role,TextRepresentation) ### `read_message/6` - http_websocket_session(Role,TextRepresentation) ### `read_mime_types/2` - mime_types ### `read_only_device_path/1` - osp ### `read_request/2` - http_server_core ### `read_response/2` - http_client_core ### `read_stream/2` - csv_protocol - tsv_protocol ### `read_stream/3` - csv_protocol - tsv_protocol ### `read_stream_by_line/2` - csv_protocol - tsv_protocol ### `read_stream_by_line/3` - csv_protocol - tsv_protocol ### `read_term_from_atom/3` - term_io_protocol ### `read_term_from_chars/3` - term_io_protocol ### `read_term_from_chars/4` - term_io_protocol ### `read_term_from_codes/3` - term_io_protocol ### `read_term_from_codes/4` - term_io_protocol ### `readme/1` - packs_common ### `readme/2` - packs_common ### `reassemble_aos_frames/5` - ccsds_packet_services ### `reassemble_aos_frames/6` - ccsds_packet_services ### `reassemble_aos_frames/7` - ccsds_packet_services ### `reassemble_aos_packets/5` - ccsds_packet_services ### `reassemble_aos_packets/6` - ccsds_packet_services ### `reassemble_aos_packets/7` - ccsds_packet_services ### `reassemble_frames/6` - ccsds_link_profiles ### `reassemble_frames/7` - ccsds_link_profiles ### `reassemble_frames/8` - ccsds_link_profiles ### `reassemble_packet_zone/5` - ccsds_packet_services ### `reassemble_packets/6` - ccsds_link_profiles ### `reassemble_packets/7` - ccsds_link_profiles ### `reassemble_packets/8` - ccsds_link_profiles ### `reassemble_tc_frame/4` - ccsds_tc_services ### `reassemble_tc_frame/5` - ccsds_tc_services ### `reassemble_tc_frame/6` - ccsds_tc_services ### `reassemble_tc_frame_with_provenance/5` - ccsds_tc_services ### `reassemble_tc_frame_with_provenance/6` - ccsds_tc_services ### `reassemble_tc_frames/4` - ccsds_tc_services ### `reassemble_tc_frames/5` - ccsds_tc_services ### `reassemble_tc_frames/6` - ccsds_tc_services ### `reassemble_tc_frames_with_provenance/5` - ccsds_tc_services ### `reassemble_tc_frames_with_provenance/6` - ccsds_tc_services ### `reassemble_tm_frames/5` - ccsds_packet_services ### `reassemble_tm_frames/6` - ccsds_packet_services ### `reassemble_tm_frames/7` - ccsds_packet_services ### `reassemble_tm_packets/5` - ccsds_packet_services ### `reassemble_tm_packets/6` - ccsds_packet_services ### `reassemble_tm_packets/7` - ccsds_packet_services ### `receive/2` - http_websocket ### `receive/3` - amqp - http_websocket - stomp ### `receive_binary/2` - http_websocket ### `receive_json/2` - http_websocket ### `receive_term/2` - http_websocket ### `receive_text/2` - http_websocket ### `recorda/2` - recorded_database_core ### `recorda/3` - recorded_database_core ### `recorded/2` - recorded_database_core ### `recorded/3` - recorded_database_core ### `recordz/2` - recorded_database_core ### `recordz/3` - recorded_database_core ### `reference_kind/2` - url(Representation) ### `refine/5` - interval_constraint_network_protocol ### `refine_propagate/3` - interval_constraint_network_protocol ### `refine_propagate/4` - interval_constraint_network_protocol ### `refine_propagate/5` - interval_constraint_network_protocol ### `refine_propagate/6` - interval_constraint_network_protocol ### `refresh_token/4` - open_id - open_id_client ### `register/2` - http_websocket_service_registry ### `regressor_options/2` - regressor_protocol ### `relation/1` - interval_algebra_protocol ### `relation/3` - interval_protocol ### `relation/4` - interval_constraint_network_protocol ### `relation_set/1` - interval_relation_set_protocol ### `relative_standard_deviation/2` - statisticsp ### `relativize/3` - url(Representation) ### `release/1` - amqp_pool ### `release_date/1` - application_protocol ### `relevance/3` - ranking_dataset_protocol ### `remove/3` - http_server_core_session ### `removeDependent/1` - subject ### `remove_duplicates/2` - listp - varlistp ### `remove_rule/1` - datalog_protocol ### `rename/4` - redis ### `rename_file/2` - osp ### `renew/2` - http_server_core_session ### `replace/3` - zipperp ### `replace/5` - memcached ### `replace_sub_atom/4` - atom ### `reply/3` - http_htmx ### `reply/4` - http_htmx ### `report_directory/3` - mutation_testing ### `report_entity/3` - mutation_testing ### `report_library/3` - mutation_testing ### `report_predicate/4` - mutation_testing ### `repository/1` - application_protocol ### `repository_branch/1` - application_protocol ### `repository_commit/1` - application_protocol ### `repository_commit_abbreviated/1` - application_protocol ### `repository_commit_author/1` - application_protocol ### `repository_commit_date/1` - application_protocol ### `repository_commit_message/1` - application_protocol ### `request/3` - json_rpc ### `request/4` - http_client - json_rpc ### `request/5` - http_client - http_client_digest_session(HTTPTransport) - http_client_session(HTTPTransport) - open_ai_client ### `request/6` - s3_endpoints ### `request/7` - http_core ### `request_body/2` - rest ### `request_body_bytes/4` - http_core ### `request_cookies/3` - http_cookie_jar ### `request_cookies/4` - http_cookie_jar ### `request_header/3` - rest ### `request_kind/2` - http_htmx ### `request_listener_shutdown/1` - http_server - http_transport_protocol ### `request_origin/2` - http_cors ### `request_properties/2` - http_htmx ### `request_property/2` - http_htmx ### `request_shutdown/1` - http_server - http_transport_protocol - http_websocket_server_service(HTTPTransport) ### `rescale/3` - numberlistp ### `reset/0` - counter - debuggerp - linter_reporter - mime_types - mutator_protocol - packs_common - ports_profiler ### `reset/1` - ports_profiler ### `reset_counter/1` - counters ### `reset_counters/0` - counters ### `reset_flags/0` - flags ### `reset_flags/1` - flags ### `reset_genint/0` - genint_core ### `reset_genint/1` - genint_core ### `reset_gensym/0` - gensym_core ### `reset_gensym/1` - gensym_core ### `reset_monitor/0` - monitorp ### `reset_seed/0` - fast_random(Algorithm) - random(Algorithm) ### `residuals/2` - hodge_rank ### `resize/2` - amqp_pool ### `resolve/3` - url(Representation) ### `resolve_command_path/2` - osp ### `resource_read/3` - mcp_resource_protocol ### `resources/1` - mcp_resource_protocol ### `response/3` - json_rpc ### `response/6` - http_core ### `response_body_bytes/4` - http_core ### `response_properties/2` - s3_headers ### `restore/1` - packs ### `restore/2` - packs ### `result/2` - json_rpc ### `retract_fact/1` - datalog_protocol ### `reverse/2` - listp - varlistp ### `rewind/2` - zipperp ### `rewind/3` - zipperp ### `rhumb_bearing/3` - geospatial_protocol ### `rhumb_destination_point/4` - geospatial_protocol ### `rhumb_distance/3` - geospatial_protocol ### `rhumb_midpoint/3` - geospatial_protocol ### `rising_factorial/3` - natural ### `rlibraries/1` - lgtdocp ### `rlibraries/2` - lgtdocp ### `rlibrary/1` - code_metric - dead_code_scanner - diagram(Format) - diagrams(Format) - lgtdocp ### `rlibrary/2` - code_metric - dead_code_scanner - diagram(Format) - diagrams(Format) - lgtdocp ### `rlibrary_score/2` - code_metric ### `rol32/3` - hash_common_32 ### `rol64/3` - hash_common_64 ### `rollback/0` - datalog_protocol ### `root_mean_squared_error/3` - statisticsp ### `ror32/3` - hash_common_32 ### `route_distance/2` - geospatial_protocol ### `route_distance/3` - geospatial_protocol ### `route_distance/4` - geospatial_protocol ### `route_parameters/2` - http_router_parameters ### `rpop/3` - redis ### `rpush/4` - redis ### `rule/2` - databasep ### `rule/3` - databasep ### `rule/4` - databasep ### `rules/1` - datalog_protocol ### `run/0` - lgtunit ### `run/1` - lgtunit ### `run/2` - lgtunit - simulated_annealing(Problem,RandomAlgorithm) ### `run/3` - simulated_annealing(Problem,RandomAlgorithm) ### `run/4` - simulated_annealing(Problem,RandomAlgorithm) ### `run_session/3` - http_websocket_service(HTTPTransport,Role,TextRepresentation) ### `run_session/4` - http_websocket_service(HTTPTransport,Role,TextRepresentation) ### `run_test_sets/1` - lgtunit ### `sadd/4` - redis ### `same_instant/2` - datep ### `same_length/2` - listp - varlistp ### `same_length/3` - listp ### `sample_arrangements/4` - arrangements_protocol ### `sample_cartesian_tuples/3` - cartesian_products_protocol ### `sample_combinations/4` - combinations_protocol ### `sample_derangements/3` - derangements_protocol ### `sample_distinct_arrangements/4` - arrangements_protocol ### `sample_distinct_cartesian_tuples/3` - cartesian_products_protocol ### `sample_distinct_combinations/4` - combinations_protocol ### `sample_distinct_derangements/3` - derangements_protocol ### `sample_distinct_multisets/4` - multisets_protocol ### `sample_distinct_partitions/3` - partitions_protocol ### `sample_distinct_partitions/4` - partitions_protocol ### `sample_distinct_permutations/3` - permutations_protocol ### `sample_multisets/4` - multisets_protocol ### `sample_partitions/3` - partitions_protocol ### `sample_partitions/4` - partitions_protocol ### `sample_permutations/3` - permutations_protocol ### `save/0` - wrapper ### `save/1` - packs - tzif_protocol - wrapper ### `save/2` - http_cookie_jar - packs - tzif_protocol ### `save_dut1_entries/1` - time_scales_data - time_scales_protocol ### `save_leap_seconds_entries/1` - time_scales_data - time_scales_protocol ### `scalar_product/3` - numberlistp ### `scale_matrix/3` - linear_algebra_protocol ### `scale_vector/3` - linear_algebra_protocol ### `scan_left/4` - metap ### `scan_left_1/3` - metap ### `scan_right/4` - metap ### `scan_right_1/3` - metap ### `scard/3` - redis ### `schema/2` - http_router - open_api_provider_protocol ### `score/3` - anomaly_detector_protocol - isolation_forest_anomaly_detector ### `score_all/3` - anomaly_detector_protocol - isolation_forest_anomaly_detector ### `scores/2` - ranker_protocol ### `search/1` - packs ### `secondary_header/2` - ccsds_packets(SecondaryHeaderLength) - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `secondary_header_flag/2` - ccsds_packets(SecondaryHeaderLength) - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `secondary_header_time/3` - ccsds_packets(SecondaryHeaderLength) ### `section_visibility/2` - gravatar ### `secure_compare/2` - crypto ### `security/1` - http_router - open_api_provider_protocol ### `security_scheme/2` - http_router - open_api_provider_protocol ### `segment_data/2` - ccsds_tc_services ### `segment_header/2` - ccsds_tc_frames(FrameLength,SegmentHeaderLength,HasFECF) ### `segment_header_suffix/2` - ccsds_tc_services ### `segment_header_suffixes/2` - ccsds_tc_services ### `segment_length_identifier/2` - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `segments/5` - jwt_compact ### `select/3` - listp - random_protocol - setp - varlistp ### `select/4` - listp - random_protocol ### `select_key/3` - jwt_jwks - open_id_jwks ### `select_key/4` - jwt_jwks ### `select_keys/4` - jwt_jwks ### `selectchk/3` - listp - setp ### `selectchk/4` - listp ### `send/2` - http_websocket ### `send/3` - http_websocket - http_websocket_service_registry - redis ### `send/4` - stomp ### `send_binary/2` - http_websocket ### `send_heartbeat/1` - amqp - stomp ### `send_json/2` - http_websocket ### `send_term/2` - http_websocket ### `send_text/2` - http_websocket ### `sentence_type/2` - nmea_protocol ### `sequence/2` - either - maybe - sequence_dataset_protocol - validated ### `sequence/3` - integer ### `sequence/4` - float - integer - random_protocol ### `sequence/5` - float ### `sequence_count/2` - ccsds_packets(SecondaryHeaderLength) ### `sequence_flags/2` - ccsds_packets(SecondaryHeaderLength) - ccsds_tc_services ### `sequence_number/2` - ccsds_tc_frames(FrameLength,SegmentHeaderLength,HasFECF) ### `sequential_occurrences/2` - listp ### `sequential_occurrences/3` - listp ### `serve/3` - http_server_core - queuep ### `serve/4` - http_directory_listing - http_server - http_static_files ### `serve/5` - http_directory_listing - http_server - http_static_files ### `serve/6` - http_server ### `serve_connection/3` - http_server_core ### `serve_listener/4` - http_transport_protocol ### `serve_listener/5` - http_transport_protocol ### `serve_once/3` - http_server - http_transport_protocol ### `serve_once/5` - http_websocket ### `serve_once/6` - http_websocket - http_websocket_server_service(HTTPTransport) ### `serve_once/7` - http_websocket_server_service(HTTPTransport) ### `serve_until_shutdown/4` - http_transport_protocol ### `serve_until_shutdown/5` - http_server - http_transport_protocol - http_websocket_server_service(HTTPTransport) ### `serve_until_shutdown/6` - http_server - http_websocket_server_service(HTTPTransport) ### `serve_websocket/4` - http_server_core ### `serve_websocket_once/5` - http_server - http_transport_protocol ### `server_accept/4` - socket ### `server_accept/5` - socket ### `server_close/1` - socket ### `server_open/2` - socket ### `server_open/3` - socket ### `server_open/4` - socket ### `server_property/2` - http_server ### `servers/1` - http_router - open_api_provider_protocol ### `session/2` - http_websocket_service_registry ### `session_count/2` - http_websocket_service_registry ### `sessions/2` - http_websocket_service_registry ### `set/1` - counter ### `set/3` - http_server_core_session - memcached ### `set/4` - random_protocol - redis ### `set/5` - memcached ### `set_element/2` - java_utils_protocol ### `set_field/2` - java_access_protocol ### `set_flag_value/2` - flags ### `set_flag_value/3` - flags ### `set_monitor/4` - event_registryp ### `set_seed/1` - arbitrary - pseudo_random_protocol ### `set_spy_point/4` - monitorp ### `set_write_max_depth/1` - debuggerp ### `setrange/5` - redis ### `setup/0` - packs_common ### `shell/1` - osp ### `shell/2` - osp ### `shell_command/1` - doclet ### `shift_matrix_diagonal/3` - linear_algebra_protocol ### `shl64/3` - hash_common_64 ### `short_flags/1` - command_line_option ### `shr64/3` - hash_common_64 ### `shrink/3` - arbitrary ### `shrink_sequence/3` - arbitrary ### `shrinker/1` - arbitrary ### `shutdown_server/1` - linda_client ### `sign/5` - jwt - jwt_jws ### `sign//1` - number_grammars(Format) ### `sign_payload/5` - jwt - jwt_jws ### `sign_request/8` - s3_signing ### `signaling_field/2` - ccsds_aos_frames(FrameLength,InsertZoneLength,HasOCF,HasFECF) ### `signing_input/4` - jwt_compact ### `singleton/2` - interval_relation_set_protocol ### `singletons/2` - termp ### `sismember/4` - redis ### `size/2` - dictionaryp - heap_protocol - setp ### `skewness/2` - statisticsp ### `sleep/1` - osp ### `sliding_window/3` - subsequences_protocol ### `smembers/3` - redis ### `softmax/2` - numberlistp ### `softmax/3` - numberlistp ### `software_heritage_identifier/1` - application_protocol ### `solve_cholesky/3` - linear_algebra_protocol ### `solve_linear_system/3` - linear_algebra_protocol ### `solve_linear_systems/3` - linear_algebra_protocol ### `solve_lower_triangular_matrix/3` - linear_algebra_protocol ### `solve_upper_triangular/3` - linear_algebra_protocol ### `solve_upper_triangular_matrix/3` - linear_algebra_protocol ### `sort/2` - listp ### `sort/3` - listp ### `sort/4` - listp ### `soundex/2` - string_distance(Representation) ### `soundex_match/2` - string_distance(Representation) ### `source_file_extension/1` - modules_diagram_support ### `space//0` - blank_grammars(Format) ### `spacecraft_id/2` - ccsds_frame_protocol - ccsds_frames ### `spaces//0` - blank_grammars(Format) ### `spec_version/1` - open_ai_catalog ### `split/3` - atom ### `split/4` - listp ### `split_aos_packet_zone/3` - ccsds_packet_services ### `split_packet_zone/4` - ccsds_packet_services ### `split_string/4` - string(Representation) ### `spy/1` - debuggerp ### `spy/3` - debuggerp ### `spy/4` - debuggerp ### `spy_point/4` - monitorp ### `spying/1` - debuggerp ### `spying/3` - debuggerp ### `spying/4` - debuggerp ### `srem/4` - redis ### `stabilize_vector_sign/2` - linear_algebra_protocol ### `stabilize_vector_sign/3` - linear_algebra_protocol ### `standard_cauchy/3` - sampling_protocol ### `standard_deviation/2` - statisticsp ### `standard_error/2` - statisticsp ### `standard_exponential/1` - sampling_protocol ### `standard_gamma/2` - sampling_protocol ### `standard_normal/1` - sampling_protocol ### `standard_t/2` - sampling_protocol ### `start/0` - ports_profiler - shell ### `start/2` - mcp_server ### `start/3` - mcp_server ### `start/4` - http_server - mcp_server ### `start/5` - http_server - mcp_server ### `start_redirect_to_file/2` - dump_trace ### `started_by/2` - interval_protocol ### `starts/2` - interval_protocol ### `state_energy/2` - simulated_annealing_protocol ### `stats/1` - amqp_pool ### `stats/2` - memcached ### `stats/3` - memcached ### `status/1` - http_response_protocol ### `status/2` - http_core ### `stem/2` - stemmer_protocol ### `stems/2` - stemmer_protocol ### `stirling_first/3` - natural ### `stirling_second/3` - natural ### `stop/0` - ports_profiler ### `stop/1` - http_server ### `stop_condition/3` - simulated_annealing_protocol ### `stop_redirect_to_file/0` - dump_trace ### `store_set_cookies/3` - http_cookie_jar ### `strata/1` - datalog_protocol ### `stream_to_bytes/2` - reader ### `stream_to_bytes/3` - reader ### `stream_to_chars/2` - reader ### `stream_to_chars/3` - reader ### `stream_to_codes/2` - reader ### `stream_to_codes/3` - reader ### `stream_to_terms/2` - reader ### `stream_to_terms/3` - reader ### `string_chars/2` - string(Representation) ### `string_codes/2` - string(Representation) ### `string_concat/3` - string(Representation) ### `string_length/2` - string(Representation) ### `string_lower/2` - string(Representation) ### `string_upper/2` - string(Representation) ### `strlen/3` - redis ### `strongest_paths/2` - schulze_ranker ### `strongly_connected_components/2` - directed_graph_protocol ### `sub_string/5` - string(Representation) ### `subclass/1` - class_hierarchyp ### `subclasses/1` - class_hierarchyp ### `subdivision/4` - iso_3166_2 - iso_3166_protocol ### `subfactorial/2` - natural ### `sublist/2` - listp - varlistp ### `submilliseconds/2` - ccsds_cds(DaySegmentOctets,SubmillisecondOctets,Epoch) ### `subscribe/4` - stomp ### `subsequence/2` - subsequences_protocol ### `subsequence/3` - listp - subsequences_protocol ### `subsequence/4` - listp ### `subsequence_at_indices/3` - subsequences_protocol ### `subsequence_length/2` - subsequences_protocol ### `subsequences/2` - subsequences_protocol ### `subsequences/3` - subsequences_protocol ### `subsequences_with_min_span/3` - subsequences_protocol ### `subset/2` - interval_relation_set_protocol - setp ### `subslices/2` - subsequences_protocol ### `substitute/4` - listp ### `subsumes/2` - interval_constraint_network_protocol - termp ### `subterm/2` - termp - xml ### `subtract/3` - listp - setp - varlistp ### `subtract_duration/3` - datep ### `subtract_matrices/3` - linear_algebra_protocol ### `subtract_vectors/3` - linear_algebra_protocol ### `succ/2` - integer ### `suffix/2` - listp - varlistp ### `suffix/3` - listp ### `suffix_alias/2` - mime_types ### `suffix_data/2` - ccsds_packet_services ### `sum/2` - numberlistp - statisticsp ### `sum_of_squares/2` - statisticsp ### `summary/1` - linter_reporter ### `superclass/1` - class_hierarchyp ### `superclasses/1` - class_hierarchyp ### `supplier/1` - application_protocol ### `supported_algorithm/1` - jwt_jwa ### `supported_range/2` - time_scales_protocol ### `supported_request_scheme/1` - http_transport_protocol ### `supported_websocket_scheme/1` - http_transport_protocol ### `suspend_monitor/0` - monitorp ### `swap/1` - expected(Expected) - validation(Validation) ### `swap/2` - random_protocol ### `swap_consecutive/2` - random_protocol ### `symdiff/3` - setp ### `symmetric_closure/2` - directed_graph_protocol ### `symmetric_eigen/3` - linear_algebra_protocol ### `symmetric_eigen/4` - linear_algebra_protocol ### `symmetric_eigen/5` - linear_algebra_protocol ### `symmetric_key_bytes/2` - jwt_jwk ### `synchronization_flag/2` - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `tab//0` - blank_grammars(Format) ### `tabs//0` - blank_grammars(Format) ### `tai_minus_utc_for_tai_unix/2` - time_scales_data ### `tail/2` - subsequences_protocol ### `tail1/2` - subsequences_protocol ### `tails/2` - subsequences_protocol ### `tails1/2` - subsequences_protocol ### `take/3` - listp ### `take/4` - listp ### `take_pending/3` - http_websocket_service_registry ### `talker/2` - nmea_protocol ### `target/1` - http_request_protocol - regression_dataset_protocol - target_supervised_dimension_reduction_dataset_protocol ### `target/2` - http_core - http_htmx ### `tcb_minus_tdb_approx/3` - time_scales_data ### `tcg_minus_tt_approx/3` - time_scales_data ### `tdb_minus_tt_approx/3` - time_scales_data ### `temporal_pairwise_dataset_connected_components/2` - ranking_dataset_common ### `temporal_pairwise_dataset_declared_items/2` - ranking_dataset_common ### `temporal_pairwise_dataset_games/2` - ranking_dataset_common ### `temporal_pairwise_dataset_games/3` - ranking_dataset_common ### `temporal_pairwise_dataset_items/2` - ranking_dataset_common ### `temporal_pairwise_dataset_periods/2` - ranking_dataset_common ### `temporal_pairwise_dataset_summary/2` - ranking_dataset_common ### `temporary_directory/1` - osp ### `temporary_tls_credentials/3` - http_process_transport ### `temporary_tls_credentials_files/3` - http_process_transport ### `term/2` - sarif ### `term/4` - sarif ### `term_expansion/2` - expanding ### `terms_to_array/2` - java_utils_protocol ### `test/1` - lgtunit ### `text_body/2` - rest ### `time_of_day/4` - ccsds_ccs(CalendarVariant,FractionOctets) ### `time_stamp/1` - osp ### `time_string/3` - iso8601 ### `time_type/2` - tzif_protocol ### `time_type/3` - tzif_protocol ### `time_type/4` - tzif_protocol ### `timeout/1` - metagol ### `timestamp/2` - ulid_protocol ### `timestamp/8` - ulid_protocol ### `to_expected/1` - validation(Validation) ### `to_expected/2` - optional(Optional) ### `to_optional/1` - expected(Expected) - validation(Validation) ### `today/3` - datep ### `token_hex/2` - crypto ### `token_urlsafe/2` - crypto ### `tolerance_equal/4` - lgtunit - number ### `tool/1` - help ### `tool_call/3` - mcp_tool_protocol ### `tool_call/4` - mcp_tool_protocol ### `tools/0` - help ### `tools/1` - mcp_tool_protocol ### `top/3` - heap_protocol ### `top_next/5` - heap_protocol ### `topological_sort/2` - directed_graph_protocol ### `topological_sort/3` - unweighted_directed_graph(Dictionary) ### `totp/5` - otp_protocol ### `totp_verify/7` - otp_protocol ### `touch/3` - memcached ### `trace/0` - debuggerp ### `trace_event/2` - logtalk ### `transaction/2` - transaction_dataset_protocol ### `transform/3` - dimension_reducer_protocol ### `transform/4` - crs_projections_protocol ### `transitive_closure/2` - directed_graph_protocol ### `transitive_reduction/2` - unweighted_directed_graph(Dictionary) ### `transpose/2` - directed_graph_protocol - pairs ### `transpose_matrix/2` - linear_algebra_protocol ### `traverse/3` - either - maybe - validated ### `triangular/4` - sampling_protocol ### `trigger/2` - http_htmx ### `trigger_name/2` - http_htmx ### `trim/2` - string(Representation) ### `trim/3` - string(Representation) ### `trim_left/2` - string(Representation) ### `trim_left/3` - string(Representation) ### `trim_right/2` - string(Representation) ### `trim_right/3` - string(Representation) ### `trimmed_mean/3` - statisticsp ### `true/1` - java_utils_protocol ### `tt_minus_tai/2` - time_scales_data ### `ttl/3` - redis ### `tx_commit/1` - amqp ### `tx_rollback/1` - amqp ### `tx_select/1` - amqp ### `type/1` - command_line_option - type ### `type/2` - ccsds_packets(SecondaryHeaderLength) - http_websocket_messages(TextRepresentation) ### `type/3` - redis ### `tzdb_version/1` - tzif_zone_ids ### `unauthorized_response/3` - http_authenticate - http_digest ### `unauthorized_response/4` - http_authenticate - http_digest ### `unexpected/1` - expected(Expected) ### `unexpecteds/2` - either ### `uniform/1` - sampling_protocol ### `uniform/3` - sampling_protocol ### `uninstall/0` - packs ### `uninstall/1` - packs ### `uninstall/2` - packs ### `union/3` - interval_relation_set_protocol - setp - two3tree - unweighted_directed_graph(Dictionary) ### `union/4` - setp - union_find_protocol ### `union_all/3` - union_find_protocol ### `universal/1` - interval_relation_set_protocol ### `unix_seconds/2` - ccsds_time_code_protocol ### `unix_to_date_time/2` - datep ### `unpin/0` - packs_common ### `unpin/1` - packs_common ### `unregister/2` - http_websocket_service_registry ### `unsubscribe/3` - stomp ### `unzip/2` - zipperp ### `update/0` - doclet - packs - registries ### `update/1` - observer - packs - registries ### `update/2` - packs - registries ### `update/3` - datalog_protocol - dictionaryp - packs ### `update/4` - dictionaryp ### `update/5` - dictionaryp ### `update_fecf/2` - ccsds_aos_frames(FrameLength,InsertZoneLength,HasOCF,HasFECF) - ccsds_frame_protocol - ccsds_frames - ccsds_tc_frames(FrameLength,SegmentHeaderLength,HasFECF) - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `update_hash_state/3` - hash_state_protocol ### `update_in/4` - nested_dictionary_protocol ### `update_in/5` - nested_dictionary_protocol ### `upper_triangular_part/2` - linear_algebra_protocol ### `upper_triangular_part/3` - linear_algebra_protocol ### `user_data/2` - ccsds_packets(SecondaryHeaderLength) ### `userinfo/4` - open_id - open_id_client ### `utc_date_time_to_instant/2` - time_scales_protocol ### `utc_to_local/3` - datep ### `utc_to_local_tz/3` - dates_tz_protocol ### `utm_crs/2` - crs_projections_protocol ### `utm_zone/2` - crs_projections_protocol ### `uuid_max/1` - uuid_protocol ### `uuid_nil/1` - uuid_protocol ### `uuid_null/1` - uuid_protocol ### `uuid_v1/2` - uuid_protocol ### `uuid_v1/3` - uuid_protocol ### `uuid_v3/3` - uuid_protocol ### `uuid_v4/1` - uuid_protocol ### `uuid_v5/3` - uuid_protocol ### `uuid_v7/1` - uuid_protocol ### `uuid_v7/2` - uuid_protocol ### `valid/0` - command_line_option ### `valid/1` - ccsds_frame_protocol - ccsds_frames - ccsds_packet_services - ccsds_time_code_protocol - ccsds_time_codes - ieee_754_protocol - interval_protocol - statisticsp - termp - url(Representation) - validation(Validation) - varlistp ### `valid/2` - type ### `valid/3` - datep - timep ### `valid_anomaly_detector/1` - anomaly_detector_protocol ### `valid_channel_reassembly_state/1` - ccsds_packet_services ### `valid_classifier/1` - classifier_protocol ### `valid_clusterer/1` - clusterer_protocol ### `valid_conversion/3` - time_scales_protocol ### `valid_cookie/1` - http_cookies(Representation) ### `valid_coordinate/1` - geospatial_protocol ### `valid_coordinate/2` - crs_projections_protocol ### `valid_crs/1` - crs_projections_protocol ### `valid_date/3` - iso8601 ### `valid_date_time/1` - datep ### `valid_descriptor/1` - ccsds_time_fields ### `valid_dimension_reducer/1` - dimension_reducer_protocol ### `valid_discontinuity_policy/1` - ccsds_link_profiles - ccsds_packet_services - ccsds_tc_services ### `valid_geohash/1` - geohash_protocol ### `valid_instant/1` - time_scales_protocol ### `valid_map_dispatch/1` - ccsds_tc_services ### `valid_option/1` - options_protocol ### `valid_options/1` - options_protocol ### `valid_pattern_miner/1` - pattern_miner_protocol ### `valid_profile/1` - ccsds_link_profiles ### `valid_ranker/1` - ranker_protocol ### `valid_reassembled_segment/1` - ccsds_tc_services ### `valid_reassembly_state/1` - ccsds_link_profiles - ccsds_packet_services - ccsds_tc_services ### `valid_regressor/1` - regressor_protocol ### `valid_scale/1` - time_scales_protocol ### `valid_segment/1` - ccsds_tc_services ### `valid_set_cookie/1` - http_cookies(Representation) ### `valid_until_date/1` - application_protocol ### `validate/1` - flags_validator - geojson_protocol - jwt_jwks - wkt_wkb_protocol ### `validate/2` - geojson_protocol - json_schema_protocol - wkt_wkb_protocol ### `validate/3` - json_schema_protocol ### `validate_claim/3` - jwt - jwt_claims ### `validate_claims/3` - jwt - jwt_claims ### `validate_document/1` - open_api ### `validate_document/2` - open_api ### `validate_grouped_dataset/1` - ranking_dataset_common ### `validate_grouped_dataset/2` - ranking_dataset_common ### `validate_header/1` - jwt_jwa ### `validate_http_request/3` - open_api ### `validate_http_request/4` - open_api ### `validate_http_response/3` - open_api ### `validate_http_response/4` - open_api ### `validate_pairwise_dataset/1` - ranking_dataset_common ### `validate_pairwise_dataset/2` - ranking_dataset_common ### `validate_pairwise_measurement_dataset/1` - ranking_dataset_common ### `validate_pairwise_measurement_dataset/2` - ranking_dataset_common ### `validate_request/3` - open_api ### `validate_request/4` - open_api ### `validate_response/3` - open_api ### `validate_response/4` - open_api ### `validate_temporal_pairwise_dataset/1` - ranking_dataset_common ### `validate_temporal_pairwise_dataset/2` - ranking_dataset_common ### `valids/2` - validated ### `value/1` - counter ### `value/3` - pairs ### `value_reference/2` - java_utils_protocol ### `values/2` - dictionaryp - pairs ### `variables/2` - termp ### `variance/2` - statisticsp ### `variant/2` - lgtunit - termp ### `varnumbers/2` - termp ### `varnumbers/3` - termp ### `vector_norm/3` - linear_algebra_protocol ### `vector_value/3` - linear_algebra_protocol ### `verified_accounts/2` - gravatar ### `verify/3` - http_authenticate_verifier_protocol ### `verify/4` - jwt ### `verify/5` - jwt - jwt_jws - jwt_openssl - open_id_openssl ### `verify_commands_availability/0` - packs_common ### `verify_fecf/1` - ccsds_aos_frames(FrameLength,InsertZoneLength,HasOCF,HasFECF) - ccsds_frame_protocol - ccsds_frames - ccsds_tc_frames(FrameLength,SegmentHeaderLength,HasFECF) - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `verify_id_token/4` - open_id - open_id_jwks_cache ### `verify_id_token/5` - open_id - open_id_jwt ### `verify_password_hash/2` - crypto ### `verify_signature/5` - jwt ### `version/1` - application_protocol - http_request_protocol - http_response_protocol ### `version/2` - ccsds_frame_protocol - ccsds_frames - ccsds_packets(SecondaryHeaderLength) - http_core - memcached ### `version/6` - pack_protocol ### `versions/3` - packs ### `vertices/2` - graph_protocol ### `vincenty_distance/3` - geospatial_protocol ### `virtual_channel_frame_count/2` - ccsds_aos_frames(FrameLength,InsertZoneLength,HasOCF,HasFECF) - ccsds_tm_frames(FrameLength,SecondaryHeaderLength,HasFECF) ### `virtual_channel_id/2` - ccsds_frame_protocol - ccsds_frames ### `void/1` - java_utils_protocol ### `void_element/1` - html ### `von_mises/3` - sampling_protocol ### `wait/2` - process ### `wald/3` - sampling_protocol ### `wall_time/1` - osp ### `warning/1` - linter_reporter ### `warnings/1` - linter_reporter ### `weakly_connected_components/2` - directed_graph_protocol ### `websocket_accept/2` - http_websocket_handshake ### `websocket_opening_key/1` - http_websocket_handshake ### `week_of_year_iso/2` - datep ### `weekday/2` - datep ### `weibull/3` - sampling_protocol ### `weight_variances/2` - bayesian_ridge_regression ### `weighted_mean/3` - statisticsp ### `welcome/0` - shell ### `when/2` - coroutining ### `whiledo/2` - loopp ### `white_space//0` - blank_grammars(Format) ### `white_spaces//0` - blank_grammars(Format) ### `with_connection/1` - amqp_pool ### `with_output_to/2` - term_io_protocol ### `within_distance/4` - geospatial_protocol ### `without//2` - sequence_grammars ### `wneighbors/3` - weighted_graph_protocol ### `word32_hex/2` - hash_common_32 ### `word64_hex/2` - hash_common_64 ### `working_directory/1` - osp ### `write_file/3` - csv_protocol - tsv_protocol ### `write_frame/2` - http_websocket_frames ### `write_framed_message/2` - json_rpc ### `write_max_depth/1` - debuggerp ### `write_message/2` - http_websocket_messages(TextRepresentation) - http_websocket_session(Role,TextRepresentation) - json_rpc ### `write_message/3` - http_websocket_session(Role,TextRepresentation) ### `write_message/4` - http_websocket_session(Role,TextRepresentation) ### `write_message/5` - http_websocket_session(Role,TextRepresentation) ### `write_request/2` - http_client_core ### `write_response/2` - http_server_core ### `write_stream/3` - csv_protocol - tsv_protocol ### `write_term_to_atom/3` - term_io_protocol ### `write_term_to_chars/3` - term_io_protocol ### `write_term_to_chars/4` - term_io_protocol ### `write_term_to_codes/3` - term_io_protocol ### `write_term_to_codes/4` - term_io_protocol ### `write_to_atom/2` - term_io_protocol ### `write_to_chars/2` - term_io_protocol ### `write_to_codes/2` - term_io_protocol ### `xor64/3` - hash_common_64 ### `year/2` - ccsds_ccs(CalendarVariant,FractionOctets) ### `z_normalization/2` - statisticsp ### `zadd/5` - redis ### `zcard/3` - redis ### `zero_or_more//0` - sequence_grammars ### `zero_or_more//1` - sequence_grammars ### `zero_or_more//2` - sequence_grammars ### `zip/2` - zipperp ### `zip/3` - expected(Expected) - optional(Optional) - validation(Validation) - zipperp ### `zip_at_index/4` - zlist ### `zone/3` - tzif_protocol ### `zone_id_kind/2` - tzif_zone_ids ### `zones/1` - tzif_protocol ### `zones/2` - tzif_protocol ### `zrange/5` - redis ### `zrank/4` - redis ### `zrem/4` - redis ### `zscore/4` - redis # Indices and tables - Index - Search Page Generated on Thu Jul 23 11:31:56 WEST 2026