Release Notes
2.40.1 - June 30, 2010
Restored support for GNU Prolog. Requires GNU Prolog version 1.4.0 (or
later), which provides support for the ISO Prolog predicate directive
multifile/1.
Improved the built-in debugger by making explicit the calls to the (\+)/1
built-in predicate.
Corrected a bug where a call to a local predicate would always fail when
an object or category contains a declared but not defined non-terminal.
Corrected a bug in the compilation of (\+)//1 calls in grammar rules.
Thanks to Bart Demoen, Ulrich Neumerkel, and Jan Burse for driving my
attention to this bug.
Recognize retractall/1, ground/1, keysort/2, sort/2, and numbervars/3 as
de facto Prolog standard built-in predicates. Calls to these predicates
will no longer be reported when the portability flag is set to "warning".
In addition, added syntax coloring support for these predicates.
Recognize e/0 and pi/0 as de facto Prolog standard built-in arithmetic
functions. Calls to these functions will no longer be reported when the
portability flag is set to "warning". In addition, added syntax coloring
support for these two functions.
Updated the internal hook predicate '$lgt_tr_predicate_indicators'/2,
used in the config files for processing proprietary Prolog directives,
in order to translate both grammar rule non-terminal indicators and
predicate indicators. A possible usage scenario is tabling grammar rule
non-terminals.
Updated the definition of the Logtalk flag "prolog_version" for Ciao in
order to compute major, minor, and patch version numbers.
Corrected a bug in the goal_expansion/2 clauses found on the SWI-Prolog
and YAP config files that are used for expanding calls to the Prolog
built-in predicates phrase/2-3 with a Object::GrammarRuleBody in the
first argument.
Updated the B-Prolog config file to require version 7.4 or later and
to workaround a missing "built_in" property for the built-in predicate
setup_call_cleanup/3.
Added unit tests for the "securemp" and "constraints/gprolog" examples.
Improved the "debug_hooks" example, showing how to use a parametric hook
object in alternative to two simple hook objects.
Improved the "help" example by adding a helper predicate for quick access
to the Logtalk User and Reference manuals. Added support for CxProlog.
Added partial support for CxProlog to the "cc" example in order to support
the "help" example.
Updated the "multifile" example in order to avoid compilation errors when
using a back-end Prolog compiler (such as B-Prolog) that doesn't support
discontiguous predicates.
Improved the "examples/tester.sh" script in order to print the current
time and date, plus the Logtalk and back-end Prolog compiler versions,
and to abstract the different syntax requirements for initialization
goals used by Prolog compilers.
2.40.0 - June 16, 2010
Bundled version 1.0 of Verdi Neruda, a meta-interpreter collection that
includes both top-down and bottom-up search strategies. Thanks to Victor
Lagerkvist for his contribution.
Added experimental on-line help support using the new "help" example. See
the example "NOTES.txt" file for a list of current operating-system and
back-end Prolog compiler limitations.
Changed the representation of meta-argument which are goals in the
meta_predicate/1 directives from "::" to "0". When compiling calls
to Prolog module meta-predicates, the meta-argument indicator ":" is
interpreted as "0", which will work for most cases. Due to the lack of
standardization of the Prolog meta_predicate/1 directive, special care
must taken when calling both Prolog proprietary built-in meta-predicates
and Prolog module meta-predicates.
Changed the implementation of the term and goal expansion mechanisms in
order to only be performed automatically by the Logtalk compiler when
compiling a source file. When dynamically creating entities at runtime or
when asserting clauses, the term_expansion/2 and goal_expansion/2 built-in
methods must be called explicitly.
Corrected a bug when using the ::/2, ::/1, ^^/2, and :/1 Logtalk control
constructs from bagof/3 and setof/3 calls with existentially quantified
variables. This bug could result in missing alternative solutions when
backtracking over the bagof/3 and setof/3 calls. Thanks to Victor
Lagerkvist for his help in diagnosing the problem.
Updated the Logtalk compiler implementation in order to simplify passing
of compilation context data.
Updated the Logtalk compiler in order to throw a permission error if the
user attempts to define clauses for the (>>)/2 control construct used in
lambda expressions.
Updated the Logtalk compiler in order to preprocess proprietary Prolog
directives within entities (using any defined config file hooks) after
term-expansion but before trying to compile the directives as Logtalk
directives. This change allows for simpler and more robust handling of
Prolog proprietary directives, specially module directives.
Recognize callable/1 and compare/3 as Prolog standard built-in predicates.
Calls to these predicates will no longer be reported when the portability
flag is set to "warning". In addtion, added syntax coloring support for
these two predicates.
Added support for the built-in non-terminal call//1 specified in the ISO
Prolog standardization proposal for Definite Clause Grammars.
Improved the implementation of Definite Clause Grammars in order to
rewrite exceptions generated when processing NonTerminal, ::NonTerminal,
and Obj::NonTerminal goals in grammar rules to refer to non-terminals
instead of compiled predicate forms when running in debug mode.
Changed the scope of the built-in methods phrase/2-3 from public to
private for consistent meta-predicate semantics. Updated the "dcgs"
example and the corresponding unit tests in order to comply with the
new phrase/2-3 predicate scope.
Corrected a bug in the implementation of the phrase/2-3 built-in methods
that could allow access to non-visible grammar rules.
Improved performance of Module:NonTerminal goals in grammar rules.
Corrected a bug in the implementation of the dynamic/0 directive where
the Logtalk compiler would fail to generate all the necessary dynamic/1
predicate directives. Bug introduced in the previous stable release.
Corrected a bug in the implementation of the clause/2 built-in method
where an error would be generated when trying to access clauses for
local dynamic predicates without a corresponding dynamic/1 directive
within objects and categories with a dynamic/0 directive.
Corrected a bug in the compilation of meta-calls and the <</2 control
construct in debug mode where the meta-arguments would not be compiled
in debug mode.
Corrected a silly bug in the compilation of proprietary Prolog directives
where meta-arguments would be compiled in debug mode if the "debug" flag
as "off" and in normal mode of the "debug" flag was "on".
Corrected a bug in the processing of compiler options when recursively
calling the logtalk_load/2 and logtalk_compile/2 built-in predicates with
a list of source files which could result in failure to apply the compiler
options to the compilation of all files.
Updated the ECLiPSe config file to always use atoms instead of strings in
the file-system access internal predicates. Corrected some bugs in the
processing of proprietary directives.
Added goal_expansion/2 clauses to the SWI-Prolog and YAP config files in
order to allow calling the Prolog built-in predicates phrase/2-3 with a
Object::GrammarRuleBody in the first argument.
Corrected the definitions of the predicates '$lgt_current_date'/3 and
'$lgt_current_time'/3 in the Qu-Prolog config file and rename it to
"qp.pl". Updated the minimum required version to 8.11 and changed the
value of the Logtalk flag "prolog_dialect" from "qu" to "qp" in order
to match the value of the new Prolog flag "dialect" implemented in
Qu-Prolog 8.11. Added support for the "smart_compilation" compiler flag.
Improved startup time when using the "qplgt.sh" integration script.
Corrected a typo in the template of the predicate subsumes/2 in the
library protocol "termp".
The SWI-Prolog POSIX integration shell script, "swilgt", now tries
first to use a "swipl" executable and, if not found, tries to use
instead a "pl" executable (thus preferring a recent SWI-Prolog version
over an older one).
Added man pages for the POSIX "*lgt" Prolog integration shell scripts,
for the Logtalk management shell scripts, and for the XML documenting
files processing scripts.
Renamed the "logtalk_select" shell script to "logtalk_version_select".
Renamed the "cplgtdirs.*" scripts to "logtalk_user_setup.*".
Include a XHTML version of the library documentation on the directory
"library/docs".
Improved the "examples/tester.sh" script in order to support running the
example unit tests compiled in debug mode.
Added a a simple maze search problem using a depth-first strategy with
loop detection to the "benchmarks" example.
Corrected a wrong declaration for the predicate environment_variable/2
in the "cc" example. Solved portability issues with Ciao Prolog, ECLiPSe,
and XSB.
Added missing support for syntax coloring of the "complements" entity
relation to Pygments.
2.39.2 - May 4, 2010
Changed the internal representation of most entity properties to use a
more compact bit representation, stored in the tables of loaded entities.
Changed the internal representation of non-critical predicate properties
to use a more compact bit representation, which includes the "multifile"
predicate property, stored in the tables of entity declared predicates.
Changed the type of the built-in methods (\+)/1, call/N, once/1, catch/3,
throw/1, bagof/3, findall/3, forall/2, setof/3, self/1, sender/1, this/1
and parameter/2 from local predicates to private predicates. Corrected a
bug in the predicate_property/2 built-in method where some of those built-
in methods would be reported as public. These changes should only require
updating any application code that explicitly expected the exception term
permission_error(access, local_predicate, Pred), which have been changed
to permission_error(access, private_predicate, Pred).
Added support for parsing operator declarations in the uses/2, public/1,
protected/1, and private/1 directives.
Updated the Logtalk compiler in order to avoid generating unnecessary (but
harmless) catchall clauses for predicate declaration lookups when there
are no local predicate declarations.
Updated the Logtalk compiler in order to convert calls to the non-standard
assert/1 built-in predicate as calls to the assertz/1 built-in predicate.
Updated the Logtalk compiler in order to reject use_module/2 directives
where the first argument is not an atom (assumed to be the module name).
This change results in using the config files to find the module name from
the module file name when the first argument of the use_module/2 directive
is a compound term (as usual when using library notation).
Updated the definition of the pseudo-object "user" in order to virtually
contain the definition of all Prolog built-in predicates.
Updated the definition of the built-in object "logtalk" in order to
implement the built-in protocols "expanding" and "monitoring".
Updated the "expanding" built-in protocol in order to declare the
predicates goal_expansion/2 and term_expansion/2 as both dynamic and
multifile.
Corrected a bug in the Logtalk compiler where a misleading error would be
reported when a source file contains a clause or a directive that is a
plain variable.
Corrected a bug in the Logtalk compiler where a broken term_expansion/2
definition expanding a term to a variable would succeed instead of
throwing an error.
Optimized meta-calls when using closures wrapped in the {}/1 control
construct. Removed redundant check for debugging mode when executing
meta-calls.
Corrected a potential bug in the Logtalk runtime when updating the meta-
call context for lambda expressions that could result in losing part of
the context.
Corrected a bug in the Logtalk runtime where errors generated when calling
the phrase/2 built-in method would be reported as resulting from calls to
the phrase/3 built-in method.
Corrected a bug in the implementation of the predicate_property/2 built-in
method that allowed access to properties on non-visible predicates.
Updated the predicate_property/2 built-in method in order to generate
meta-predicate templates for the call/2-N built-in methods, to return
"multifile" properties for Prolog built-in predicates, and to support
two new properties, "logtalk" and "prolog", that allows us to distinguish
between predicates defined by Logtalk and predicates defined by the back-
end Prolog compiler.
Corrected a bug in the Logtalk built-in debugger that would prevent user
interaction at the "fact" and "rule" unification ports by always skipping
to the next port, ignoring leash settings.
Corrected a bug in the processing of the conditional directives that would
result in an hanging else/0 directive when the "then" block of a false "if"
was a "if...else...endif" block.
Added support for the predicate renaming operator as/2 found on SWI-Prolog
and YAP but only when parsing use_module/2 directives in modules that are
being compiled as objects.
Updated the SWI-Prolog hooks file, "configs/swihook.pl", in order to avoid
intercepting Prolog ensure_loaded/1 calls by the prolog_load_file/2 hook
predicate. This change solves issues when calling Prolog module library
predicates from within Logtalk objects and categories. Thanks to Parker
Jones for the bug report.
Changed the predicate '$lgt_pl_meta_predicate'/2 in all supported config
files to '$lgt_pl_meta_predicate'/3 in order to simplify the handling of
proprietary built-in meta-predicates by the Logtalk compiler and runtime.
Updated the ECLiPSe, SICStus Prolog, SWI-Prolog, and YAP config files in
order to preprocess the use_module/2 directive, converting the module file
name into the module name.
Updated the SWI-Prolog and YAP config files in order to preprocess the
reexport/2 module directive, converting the module file name into the
module name, and in order to ignore the meta-predicate declaration of
the directives/predicates use_module/1-2.
Updated the SWI-Prolog config file with more robust and fast code for
preprocessing module directives when the modules are already loaded.
Also added support for the new use_foreign_library/1-2 proprietary
directives and partial support for modules that take their name from
the file name.
Updated the YAP config file in order to use the more standard predicate
working_directory/2.
Added support for parsing use_module/3 directives to the SICStus Prolog
config files. Improved finding the module name from the module file name
when preprocessing the directives use_module/1-2.
Moved the "eclipse6.pl" config file to the "configs/unsupported" folder
as Logtalk only supports ECLiPSe using the "eclipse6iso.pl" config file.
Updated the "eclipse6iso.pl" config file with partial parsing solutions
for some proprietary ECLiPSe directives.
Updated the ECLiPSe config file with more robust code for parsing
use_module/1 directives, capable of processing both ECLiPSe module/1
directives and the module/2 directives used by other Prolog compilers.
Updated the B-Prolog config file in order to support foreach/2-N calls
for any valid value of N (previous versions of the config file only
supported foreach/2-4 calls).
Updated the Qu-Prolog integration script, "qplgt.sh", in order to use
larger memory values for the code and environment areas an in preparation
for its next release.
Replaced the predicate as_dictionary/2 in the library object "bintree"
with a new implementation, contributed by Paul Fodor, that returns a
semi-balanced tree.
Added a predicate and an operator definition, =~=/2, for comparing floats
for approximate equality to the library object "lgtunit". Updated the unit
tests of several examples in order to use this predicate.
Updated the "examples/tester.sh" script in order to report an error when
the default Prolog back-end compiler is not found. Thanks to Parker Jones
for the bug report. Updated the script to also report errors that are not
written to standard error and to print a note when a unit test is not
applicable.
Updated the "encodings" example unit test loader file to correctly detect
back-end Prolog compilers supporting the encoding/1 directive. Added new
test files for each supported text encoding.
Added some more unit tests for the "reflection" example.
Fixed a typo that prevented running the "mtbatch" example using XSB as the
back-end Prolog compiler.
Simplified the "cc" example when using SICStus Prolog 4.x as the back-end
compiler by moving importing of the "system3" library shell/1-2 predicates
to the config file.
Added unit tests for the "constraints", "hooks", "miscellaneous", and
"people" examples.
Corrected a bug in the "lambdas" example (a missing meta_predicate/1
directive in the object "sigma").
Improved "inheritance" example in order to better illustrate inheritance
semantics for classes and instances. Added a set of unit tests.
Updated the implementation of the best first heuristic state space search
method in the "searching" example in order to avoid unnecessary meta-calls.
2.39.1 - March 31, 2010
Updated the Logtalk compiler and runtime to support calls to the built-in
predicates threaded_peek/2 and threaded_exit/2 where the second argument
(thread tag) is only instantiated at runtime. Updated the exception term
thrown by threaded_exit/2 when the thread goal don't exist to use error/3
instead of error/2.
Updated the implementation of the uses/2 directive in order to allow
safe use of the declared shortcuts at runtime.
Corrected a bug when using the use_module/2 directive that resulted in
a performance penalty when calling module predicates.
Updated the Logtalk compiler to warn the user when finding deprecated
directives.
Updated the Logtalk compiler to recognize "prolog_compatible_version"
and "tabling" as valid flags.
Updated the Logtalk compiler to compile settings files with the compiler
flag "altdirs" turned off in order to avoid problems with directory
permissions for back-end Prolog compilers, such as Ciao and XSB, which
require the first run of Logtalk to be made by an administrative user.
Corrected a bug in the Logtalk compiler that forced recompilation of
source files when the "smart_compilation" flag was set to "on".
Corrected an erroneous compiler warning when reporting referenced but
unknown objects when using the {Object}::Message notation. Thanks to
Parker Jones for the bug report.
Corrected a bug in the <</2 control construct where errors would be
reported without an error/3 wrapper. Thanks to Parker Jones for the
bug report.
Corrected a predicate lookup caching bug for the ^^/1 control construct
(aka "super") that resulted in cached entries never being used when the
argument was a different predicate from the one being defined by the
clause containing the call (uncommon but possible).
Updated the SWI-Prolog and YAP config files in order to recognize and
compile the proprietary directive create_prolog_flag/3.
Updated the ECLiPSe config files to treat numbervars/3 as a built-in
predicate.
Updated the file system utility predicates in the XSB config file in
order to ensure full expansion of paths into full paths.
Updated the CxProlog config file to workaround a wrong priority for the
standard **/2 operator ("xfx" instead of "xfy"). Updated the CxProlog
integration scripts for both POSIX and Windows systems in order to use
the "--script" command-line option, thus freeing the "--goal" option.
Added a logtalk_library_path/2 entry for the library "home" (the user
home directory) when running on Windows operating-systems. However,
this definition only works for some back-end Prolog compilers due to
bugs in expanding paths containing more than one environment variable.
Updated the "types_loader.lgt" library loader file in order to load the
"rbtree" library object.
Updated the library object "term" in order to implement the variant/2
predicate as a call to the =@=/2 proprietary built-in predicate when
using either SWI-Prolog or YAP as the back-end Prolog compilers.
Corrected a predicate property name bug (alias/1 instead of alias_of/1)
in the library object "listing".
Replaced the library object "lgtunit" with a new version supporting three
different dialects for specifying unit tests. See the example "testing"
and the library file "lgtuint.txt" for details.
Added unit tests for most examples, based on the sample queries found
on each example "SCRIPT.txt" files. The original tests, contributed by
Parker Jones, were rewritten to use the updated version of the "lgtunit"
library. Added a POSIX shell script, "examples/tester.sh" for automating
running the examples unit tests.
Added a missing file, "lists.lgt", to the "metainterpreters" example.
Added shell/1-2 predicates to the operating-system interface defined in
the "cc" example.
Added an op/3 directive for the :/2 operator to the "logging" example in
order to avoid syntax errors when running on a back-end Prolog compilers
that don't define this operator.
Updated the "modules" example in order to avoid an object name conflict
with the library object "list".
Corrected assorted typos on the sample queries of several examples. Thanks
to Parker Jones for the bug reports.
Updated several examples sample queries to workaround a XSB parsing bug
triggered by using message broadcasting syntax.
Updated the Windows installer in order to warn the user when no compatible
Prolog compiler can be found. In addition, update the installer in order
to also create shortcuts to the main documentation files on the Logtalk
user folder.
Added an experimental "logtalk_backend_select.sh" POSIX shell script for
defining an alias, "logtalk", to a chosen back-end Prolog integration
script. Suggested by Parker Jones.
Documentation cleanup, specially regarding installing, customizing, and
running Logtalk. Simplified Prolog compatibility notes as the current set
of compatible Prolog compilers provide a more uniform experience.
Corrected a bug in the POSIX lgt2*.sh scripts that would prevent finding
the Logtalk documenting XML files when using a XML Schema specification.
Thanks to rbt for the bug report.
2.39.0 - February 28, 2010
Removed support for the following Prolog compilers: ALS Prolog, Amzi!
Prolog, BinProlog, GNU Prolog, IF/Prolog, JIProlog, K-Prolog, LPA
MacProlog, LPA WinProlog, MasterProlog, Open Prolog, Prolog II+, and
Quintus Prolog. Only Amzi! Prolog, GNU Prolog, and Quintus Prolog seem
to be actively maintained. Amzi! Prolog ignores the official and de
facto Prolog standards. GNU Prolog is currently missing crucial support
for the standard directive multifile/1. Quintus Prolog is superseded by
SICStus Prolog (and required hacks to the Logtalk compiler that rendered
it incompatible with all the other Prolog compilers).
Removed support for all Prolog compilers that don't support the ISO Prolog
standard directive multifile/1. Removed the "multifile_directive" config
flag from the config files of supported Prolog compilers.
Reintroduced parametric categories. Changed semantics of the parameter/2
built-in execution-context method when used in category predicates to
access the category parameters instead of the parameters of the object
importing the category. This change provides safer and more robust use
of parameter/2 calls in categories.
Improved compile-time error-checking of calls to the parameter/2 built-in
execution-context method
Removed the meta-predicate compilation safety rule that required the
number of normal arguments to be equal or greater than the number of
extra arguments required by a closure. This overly restrictive rule
prevented the definition of some useful and safe meta-predicates.
Moved all config files for no longer supported Prolog compilers to the
"configs/unsupported" folder. Moved all integration scripts for no longer
supported Prolog compilers to the "integration/unsupported" folder.
Changed the default value of the compiler flags "altdirs" and "clean" to
"on" for all supported Prolog compilers. Added a read-only compiler flag
"modules".
Added index/1 directives for the predicate lookup caching predicates to
the SWI-Prolog integration files (see "integration/logtalk_comp_swi.pl").
These directives may or may not improve performance, depending on your
application.
Added meta-predicates sort/3 and msort/3 to the library object "list".
These sorting predicates accept as first-argument a closure to be used
for comparing list terms when sorting.
Added new predicate declarations to the "dictionaryp" library protocol:
clone/3, clone/4, previous/4, next/4, min/3, max/3, apply/4, delete_min/3,
delete_max/3, map/2, and update/4. Removed the insert_all/3 predicate
declaration. Added a missing meta-predicate directive for the predicate
map/3. Improved predicate documentation.
Added new predicates preorder/2, inorder/2, and postorder/2 to the library
object "bintree". Corrected broken definition of the meta-predicate map/3.
Added definitions for the new predicates in the updated "dictionaryp"
library protocol.
Added a port of the Vitor Santos Costa implementation of Red-Black trees
(found on the YAP library "rbtrees"). The port, "rbtree", implements the
"dictionaryp" library protocol. Work in progress.
Added a port of the Richard O'Keefe implementation of heaps. This port
provides both max-heap and min-heap implementations. Work in progress.
Updated the "parametric" example to also illustrate the use of parametric
categories.
Updated the "metainterpreters" example, adding a new meta-interpreter for
counting the number of resolution steps when proving a goal.
Added the classical naive list reverse benchmark test to the "benchmarks"
example. Added a version of the benchmark test module for ECLiPSe. Updated
the "benchmarks" object in order to also run the module tests whenever the
back-end Prolog compiler supports modules.
Simplified usage of the "mtbatch" multi-threading benchmarks example
by using conditional compilation directives for the Prolog-specific
predicates instead of a parametric object.
Updated the loader file for the "encodings" example in order to only load
the UTF-32 source file ("mythology.lgt") on Prolog compilers supporting
this encoding (currently, only CxProlog and SICStus Prolog). This avoids
misleading loading error messages when using SWI-Prolog or YAP.
Updated the "cc" example with predicate definitions for Ciao and added a
new predicate, expand_path/2, for all supported back-end Prolog compilers.
Updated the Logtalk Windows installer in order to detect the ECLiPSe 6.1
version (both 32 and 64 bits versions). If both 6.0 and 6.1 versions are
installed, the installer creates a shortcut for using version 6.1 as the
back-end Prolog compiler.
Updated the Logtalk Windows installer in order to detect SICStus Prolog
4.x installations when running on Windows 64 bits versions.
Update the Windows installer script in order create integration shortcuts
for both console and window versions of SWI-Prolog, to check for the new
names of the SWI-Prolog executables ("swipl.exe" and "swipl-win.exe") when
creating the shortcuts, and to detect SWI-Prolog 64 bits versions.
Updated the Windows installer to detect CxProlog 0.97.4 and later versions
(which use a different registry entry from previous versions).
2.38.2 - January 31, 2010
Added support for calling :/1 goals using the <</2 control construct.
Added support for calling non-redefined built-in predicates using the
:/1 control construct.
Corrected a Logtalk compiler bug (introduced in version 2.38.1) where
redefinitions of Prolog built-in predicates would be ignored. Thanks
to Parker Jones for the bug report.
Simplified declaration and handling of proprietary directives with
meta-arguments by defining a '$lgt_pl_meta_directive'/1 predicate in
all config files.
Added '$lgt_tr_predicate_indicators'/2, '$lgt_tr_predicate_heads'/2, and
'$lgt_tr_predicate_heads'/3 hook predicates to the Logtalk compiler in
order to simplify handling of proprietary directives in config files.
Added support for the proprietary directive eager_consume/0 to the config
file of B-Prolog and corrected bugs that prevented using the proprietary
tabling directives mode/1 and (:)/2 within objects and categories.
Added support for the proprietary directive demon/1 to the config files
of ECLiPSe.
Added support for the proprietary directive block/1 to the config files
of SICStus Prolog.
Corrected a bug in the SWI-Prolog config file that prevented using the
proprietary directive index/1 within objects and categories.
Added support for the proprietary directive initialization/2 to the config
files of SWI-Prolog and YAP.
Added support for the proprietary meta-predicates findall/4 and tfindall/3
to the XSB config file.
Updated the library object "term" with a (hopefully) faster implementation
of the predicate ground/1, following advise by Lindsey Spratt on the GNU
Prolog mailing list.
Corrected a validation (but harmless) bug in the Logtalk syntax coloring
support for the jEdit text editor.
2.38.1 - December 21, 2009
Added support for using the {}/1 compiler bypass Logtalk control construct
to wrap closures that should be executed within the context of the pseudo-
object "user" (e.g. calls to Prolog built-in predicates).
Workaround module meta-predicate semantics in order to support calls to
module meta-predicates specified in use_module/2 directives within objects
and categories.
Added support for compiling calls to module meta-predicates that are
explicitly qualified (may require that the modules are loaded, depending
on the back-end Prolog compiler).
Code cleanup of meta-predicate directives compilation. Tighten checks of
meta-predicate directives and meta-predicate directive arguments.
Improved compilation of call/2-N goals.
Improved performance of meta-calls that are compiled at runtime.
Improved performance of the lambda expression Free/Goal, usually used in
bagof/3 and setof/3 calls.
Improved lambda expression error-checking and added support for using a
(>>)/2 lambda expression as a goal.
Corrected a bug in handling the meta-call context for lambda expressions.
Corrected a typo in the exception term generated when sending a message to
an object corresponding to a built-in local method.
Updated the CxProlog config file in order to set write term and write list
limits that allow compilation of the Logtalk libraries and examples (the
default values are two low in some cases leading to compilation errors).
In addition, take advantage of the new "version_data" flag, thus requiring
version 0.97.4 or a later version.
Updated the SWI-Prolog config file in order to recognize and compile the
proprietary directive at_halt/1.
Updated the B-Prolog config file in order to add a missing meta-predicate
declaration for the proprietary foreach/2 built-in predicate.
Updated the YAP config file by adding a missing declaration for the time/1
proprietary built-in meta-predicate and by commenting out setting the call
that sets the "language" flag to "iso" due to all the YAP libraries that
don't compile with this setting.
Updated the XSB config file by adding a missing declaration for the time/1
proprietary built-in meta-predicate and a definition for the predicate
setup_call_cleanup/3 (in order to restore compatibility with the Logtalk
multi-threading features).
Updated all config files with information on the availability of the
setup_call_cleanup/3 predicate.
Expanded the "lambdas" example with a contribution by Artur Miguel Dias,
more sample queries (including non-deterministic ones), and some simple
benchmarks.
Added syntax coloring support for the ^/2 existential quantifier operator
for most supported text editors and syntax highlighters. Added sample code
using the ^/2 existential quantifier to the syntax coloring test file.
2.38.0 - December 3, 2009
Added lambda expression support. Added an example, "lambdas", illustrating
the use of lambda expressions.
Added a new compiler flag, "clean", for cleaning the intermediate Prolog
files generated when compiling Logtalk source files.
Simplified representation of the runtime execution context using a simple
list resulting in a small performance increase for some back-end Prolog
compilers such as B-Prolog.
Added support for using the set_logtalk_flag/2 directive within Logtalk
entities. This allows e.g. easy setting of entity properties such as
"events" when creating new entities using the entity creation built-in
predicates. Updated documentation on the set_logtalk_flag/2 directive
and the set_logtalk_flag/2 built-in predicate exceptions.
Added support for runtime instantiation of the <</2 control construct
arguments.
Added support for specifying multiple initialization/1 directives when
using the create_object/4, create_category/4, and create_protocol/3
built-in predicates.
Corrected a bug where some entity properties would not be set when using
the create_object/4, create_category/4, and create_protocol/3 built-in
predicates.
Corrected a bug (introduced in version 2.37.4) when simplifying calls
to the {}/1 external call control construct with a variable argument.
Updated the Logtalk compiler to workaround file path problems with
back-end Prolog compilers (e.g. SICStus Prolog) where calls to the
open/3-4 built-in predicate are not always relative to the current
working directory.
Improved Logtalk runtime error handler when using SWI-Prolog as the
back-end compiler.
Updated the ECLiPSe, SICStus Prolog, SWI-Prolog, and YAP config files
in order to detect discontiguous predicate clause warnings and update
the Logtalk warnings counter accordingly.
Corrected a bug in the ECLiPSe config files in the definition of the
predicate '$lgt_current_time'/3 where the number of seconds would be
returned as a float instead of as an integer.
Updated the SICStus Prolog config files in order to support settings
files. Updated the SICStus Prolog 4.x config file in order to use the
new "version_data" flag and recognize the new do/2 meta-predicate added
in version 4.1.
Updated the GNU Prolog config file to make use of the new "version_data"
flag in the forthcoming 1.3.2 version.
Updated the SWI-Prolog config file in order to ensure that the predicate
'$lgt_expand_path'/2 returns full paths.
Updated the library support for unit testing in order to allow per-test
setup and cleanup goals and to provide timing, testing file information,
and statistics on passed and failed tests. Updated the "testing" example
for the changes to the unit test support.
Updated the Logtalk Windows installer in order to detect the new SICStus
Prolog 4.1 version. If both 4.0.x and 4.1.x versions are installed, the
installer creates a shortcut for using version 4.1.x as the back-end
Prolog compiler.
Updated the Logtalk Windows installer in order to detect both XSB single-
threaded and multi-threaded versions and to no longer create integration
shortcuts for XSB versions older than 3.2.
Corrected a possible data loss bug when using the Debian and MacOS X
installers where some third-party mime-type associations might be lost
when adding the Logtalk mime-type to the Shared MIME-info Database.
Corrected a harmless syntax error in the Logtalk POSIX install shell
script when the "update-mime-database" command is not available.
Added a Logtalk version of the "Closed Knight's Tour" SWI-Prolog CLP(FD)
example written by Markus Triska.
Added a analyse_text() function to the Pygments syntax highlighter.
Updated the Logtalk mode for the SubEthaEdit text editor 3.5.x version
with the help of Martin Pittenauer.
Added some missing cases to the Logtalk source file used for testing
syntax highlight support.
2.37.5 - October 29, 2009
Updated the Logtalk multi-threading features, replacing all calls to
the call_cleanup/2 built-in predicate with calls to the more reliable
setup_call_cleanup/3 built-in predicate. This change requires recent
versions of SWI-Prolog, XSB, and YAP when writing multi-threading code.
Improved performance of the database built-in methods retractall/1 and
retract/1 whenever their use requires updating the internal predicate
definition lookup tables.
Corrected a bug in the Logtalk runtime when printing a compatibility
warning regarding the back-end Prolog compiler version being used.
Corrected a bug in the implementation of the :/1 control construct when
some but not all imported categories are compiled for static binding.
Corrected a event handling bug in the processing of meta-calls whose
meta-arguments have the format Object::Closure.
Corrected a bug in the runtime error handler for top-level message sending
calls where the reported exception term context argument would be unbound.
Corrected a bug in the compilation of multifile directives and multifile
predicate clauses within objects and categories for the pseudo-object
"user". Corrected a bug in the compilation of multifile predicate clauses
for other objects and categories.
Corrected a safety meta-predicate compilation bug when using static
binding to optimize a call to a local meta-predicate made by a normal,
public predicate.
Corrected a safety meta-predicate compilation bug when using a meta-
predicate call in the body of a user-defined meta-predicate clause in
order to change the number of extra arguments of a closure.
Added a monitor/1 predicate to the library event registry objects.
Updated the definition of the monitors/1 and monitored/1 predicates
in order to avoid using the non-standard predicate sort/2.
Added support for adding the Logtalk mime-type to systems supporting
the freedesktop.org shared mime-info database.
Added support for adding the Logtalk mime-type and the file description
for Logtalk source files to the Windows installer.
Updated the RPM spec file and build script to no longer require root
access. The RPM package built from these files is no longer relocatable.
Updated the POSIX (un)install shell scripts to print the version number
of the Logtalk release being (un)installed.
Updated the "lgt2pdf.sh" and "lgt2txt.sh" POSIX shell scripts in order
to prevent accidental deletion of the "logtal.dtd" and "logtalk.xsd"
files in the Logtalk installation directory. Thanks to Michael Igler
for the bug report.
Added information about using the Sublime Text Windows text editor for
editing Logtalk source files.
Added a set of Logtalk source code snippets and a set of compilation
and documenting tools for the Gnome's Gedit text editor (see the file
"wenv/gedit/NOTES.txt" for details).
Replaced GeSHi support with a new language file written from scratch.
Added syntax coloring support for the module directive reexport/1 to
all supported text editors and syntax highlighters.
Updated documentation in order to remove references to deprecated syntax
for sequences of predicate indicators in predicate directives. Updated
documentation on built-in meta-predicates to correctly described their
semantics when used within categories.
Added a simple example, "multifile", illustrating how to use multifile
predicates within Logtalk objects and categories.
Updated the "securemp" example in order to illustrate using a call to
a meta-predicate to change the number of extra arguments of a closure.
2.37.4 - September 18, 2009
Updated the Logtalk compiler to expand calls to the forall/2 and once/1
built-in predicates in order to improve performance.
Corrected a bug in the Logtalk compiler that resulted in some calls to the
built-in predicate call/1 being transparent to cuts in its goal argument.
Updated the Logtalk runtime to try to detect and warn about incompatible
back-end Prolog compiler versions.
Updated the Logtalk runtime to avoid spurious type errors when working
with parametric objects using ECLiPSe due to the weak ISO Prolog standard
compliance of this compiler.
Added two new commands to the Logtalk built-in debugger for writing the
current goal as a quoted term and for removing context spy points at
leashed ports.
Added a logtalk_library_path/2 entry for the library "home" (the user home
directory) when running on POSIX operating-systems.
The library object "pairs" in now loaded by the "types_loader.lgt" loader
file.
Updated the Qu-Prolog integration script in order to set the choice point
stack to 256KB in order to support loading larger Logtalk applications.
Updated the Qu-Prolog config file in order to set the default value of the
"tmpdir" to '.lgt_tmp/'.
Updated the B-Prolog and SICStus Prolog config files in order to set
the default value of the "tmpdir" depending on the operating-system by
checking for a POSIX-only default environment variable.
Added missing reference to the "settings.lgt" file to the spec file used
for building the Logtalk RPM installer.
Modified the scripts used to generate the PDF versions of the User and
Reference manuals to use a local catalog file for the XHTML DTD files.
2.37.3 - August 10, 2009
Added a workaround for the lack of standardization of the Prolog built-in
predicate predicate_property/2 when used in the if/1 and elif/1 conditional
compilation directives.
Added support for using file name paths containing environment variables
in the logtalk_library_path/2 predicate and in the "xmldir" and "tmpdir"
compiler flags when using selected back-end Prolog compilers.
Corrected a code optimization bug in the Logtalk compiler when compiling
bagof/3 and setof/3 calls whose goal is existentially qualified (using
the ^/2 operator). Thanks to Joerg Schuster for the bug report.
Simplified compilation and improved performance of initialization/1 goals
for Prolog compilers supporting the multifile/1 predicate directive.
Added a "libpaths/libpaths_no_multifile.pl" file for pesky back-end Prolog
compilers that don't support the ISO Prolog standard multifile/1 predicate
directive (e.g. GNU Prolog and K-Prolog).
Updated the library object "term" to use the built-in predicates ground/1
and subsumes/2 when available in the back-end Prolog compiler.
Updated the library object "list" to use the built-in predicates sort/2
and msort/2 when available in the back-end Prolog compiler.
Updated the library object "integer" to use the built-in predicates plus/3,
between/3, and succ/2 when available in the back-end Prolog compiler.
Added a predicate add/3 to the library object "difflist".
Added a predicate '$lgt_expand_path'/2 to all config files in order to
expand file name paths that may contain e.g. environment variables or
relative paths into absolute file names (only supported in some back-end
Prolog compilers).
Updated all Prolog integration shell scripts to avoid a compatibility
issue in Ubuntu distributions when running the scripts using sudo.
Updated the SWI-Prolog integration support files in order to hide some of
the Logtalk internal predicates from the SWI-Prolog native profiler.
Updated the ECLiPSe config files to ensure that attempts to create a
directory that already exists succeed instead of throwing an error.
Updated text editor configuration files in order to remove references to
the no longer used ".config" file name extension and to support syntax
coloring and code completion of multifile/1 and use_module/1-2 directives.
Corrected some spelling and XHTML typos in the User and Reference Manuals.
Corrected some BibTeX typos in the "BIBLIOGRAPHY.bib" file.
2.37.2 - June 29, 2009
Added support for parsing reexport/2 module directives when compiling
Prolog modules as Logtalk objects. The predicate renaming operator as/2
found on SWI-Prolog and YAP is also supported.
Added support for using grammar rule non-terminal indicators in the uses/2,
multifile/1, reexport/2, and use_module/2 directives.
Added support for parsing operator declarations in the module/2, export/1,
reexport/2, and use_module/2 module directives.
Added support for declaring and defining object and category multifile
grammar rules.
Corrected a bug where a failed load of a settings file could be reported
as successful.
Corrected a bug when compiling an object or category normal predicate that
redefines a built-in Prolog meta-predicate.
Added missing dynamic directives in the definition of the pseudo-objects
"debugger" and "user".
Eliminated message-sending overheads when sending messages to the pseudo-
object "user".
Allow the "debugger" built-in object to play the role of both a class and
a prototype when being specialized or extended.
Added support for compiling module-qualified arguments in calls to Prolog
database and reflection built-in predicates.
Added support for using multiple info/1 directives per entity and multiple
info/2 directives per predicate (useful when compiling modules as objects).
Added limited support for translating queries as initialization goals when
compiling modules as objects (queries must be calls to locally defined
predicates or to predicates referenced in use_module/2 directives).
Optimized performance of meta-predicates whose meta-arguments are goals,
not closures, when using static binding.
Improved automatic generation of XML documenting files for parametric
objects when no parameter names are given.
Updated the SWI-Prolog config file in order to support the proprietary
predicate directives format_predicate/2, noprofile/1, and volatile/1.
Updated the SICStus Prolog, SWI-Prolog, and YAP config files in order to
workaround broken meta-predicate declarations for the built-in predicates
format/2-3 and in order to support the sloppy use of the ensure_loaded/1
directive within modules, rewriting it to a use_module/1 directive.
Updated the ECLiPSe, SWI-Prolog, and YAP config files in order to support
parsing of reexport/1 module directives.
Updated the YAP config file in order to support parsing of the use_module/1
module directive.
Updated the ECLiPSe config files in order to make available the predicate
numbervars/3 and to support parsing of comment/2, import/2, inline/2, and
set_flag/3 proprietary directives.
Updated the SICStus Prolog config files in order to support parsing of the
load_foreign_resource/1 proprietary directive.
Updated the B-Prolog config file in order to support the new foreach/3-4
meta-predicates and the new table mode directive in B-Prolog 7.3. Added
definition for the "prolog_version" read-only compiler flag.
Updated the XSB config file in order to enable support for multifile
directives (version 3.2 or later is required).
Improved conversion guide for migrating Prolog module code to Logtalk.
Improved documentation and examples of using the term and goal expansion
mechanisms.
The "lgt2*.sh" documentation shell scripts have been updated to ignore
XML files that are not XML documenting files generated by the Logtalk
compiler.
2.37.1 - June 2, 2009
Added support for declaring and defining object and category multifile
predicates. This new feature is primarily intended to facilitate migration
of Prolog code to Logtalk and should be used with caution as multifile
support is spotty among back-end Prolog compilers (easily leading to
portability problems). Multifile predicates can be both static or dynamic.
Added support for compiling clauses for module multifile predicates within
objects and categories in order to provide better integration with CLP(FD)
and similar constraint packages.
Added support for parsing module/2 directives whose export list contains
operator declarations.
Improved Logtalk compiler error-checking of file-level op/3 directives.
Updated the Logtalk compiler to try to detect calls to proprietary built-in
meta-predicates not declared in the config files. Detection may fail due to
the lack of standardization of meta-predicate specifications.
Updated the Logtalk compiler to avoid unexpected compilation errors when
querying predicate properties due to the lack of standardization of the
Prolog predicate_property/2 built-in predicate.
Improved runtime error-checking for meta-calls whose closure argument is
either Object::Closure or Module:Closure.
Corrected a Logtalk compiler bug where a redefinition of a proprietary
built-in meta-predicate (declared in the config files) would be ignored.
Corrected a bug in the implementation of the Logtalk <</2 control construct
where a redefinition of a built-in predicate would be ignored.
Corrected a Logtalk compiler bug where initialization/1 goals would be
compiled as normal code instead of as debug code when compiling a source
file in debug mode.
Updated documentation support to include predicate alias information on
the automatically generated XML documenting files. Updated the sample XSLT
transformations to output alias information.
Corrected a bug in the YAP config file that prevented setting the "unknown"
flag to "error" and the "language" flag to "iso". Added declarations for
the proprietary built-in meta-predicates call_residue_vars/2, ignore/1,
depth_bound_call/2, setup_call_cleanup/3, and setup_call_catcher_cleanup/4.
Removed declaration for the outdated meta-predicate on_cleanup/1. Added
support for the thread_initialization/1 proprietary directive.
Updated the B-Prolog config file with declarations for the proprietary
built-in meta-predicates fd_minimize/2 and fd_maximize/2.
Updated the GNU Prolog config file in order to recognize the foreign/1-2
proprietary directives. Added declarations for the proprietary built-in
meta-predicates fd_minimize/2 and fd_maximize/2.
Updated the ECLiPSe config files with declarations for the proprietary
built-in control constructs and meta-predicates ~/1, not/1, and (-?->)/1
(the last one only for the non-ISO config files).
Updated the SWI-Prolog config files with declarations for the proprietary
meta-predicates setup_call_cleanup/3, setup_call_catcher_cleanup/4, when/2,
and with_output_to/2. Added support for the thread_initialization/1
proprietary directive. Improved parsing of use_module/1-2 directives.
Added a dummy definition for the predicate '$lgt_logtalk_prolog_encoding'/3
to the config files of all back-end Prolog compilers that don't support the
encoding/1 directive.
Added predicate sequence/3 to the library object "integer".
Added predicates append/2 and msort/2 to the library object "list". Fixed
some termination issues with the length/2 predicate on buggy input.
Added aliases foldl/4, foldr/4, scanl/4, and scanr/4 to the library object
"meta".
Added an experimental "logtalk_select.sh" POSIX shell script for switching
between installed Logtalk stable versions.
Added a POSIX integration script, "xsb64lgt", for using Logtalk with the
single-threaded, 64 bits version of XSB.
Added a note on a workaround for compatibility issues between GNU Prolog
and the contributed XML parser library. Thanks to Nicolas Pelletier for
the bug report.
Added a new example, "securemp", illustrating the safety rules used by
Logtalk in the compilation and execution of meta-predicates (as described
on the "Secure Implementation of Meta-predicates" PADL'09 paper).
Extended the "constraints" example for SWI-Prolog and YAP illustrating
the definition of custom constraint propagators within objects.
Added instructions on how to enable a source code browser when editing
Logtalk source files with the Vim text editor (using the Taglist Vim
plugin and Exuberant ctags).
2.37.0 - May 11, 2009
Improved dynamic binding performance by making calls to the lookup caches
call the cached methods instead of simply returning the corresponding
callable terms, therefore no longer requiring a meta-call for executing
the methods. For multi-threaded back-end Prolog compilers, the new caching
mechanisms forces the lookup cache dynamic predicates to be declared
thread shared instead of thread local.
Improved performance of the built-in database methods retractall/1 and
retract/1.
Improved performance of user-defined object and category meta-predicates.
Added support for meta-calls whose closure argument is ::Closure.
Simplified compilation and improved performance of predicates that call
local user meta-predicates.
Corrected a bug where calls to local user meta-predicates would fail.
Corrected a bug where local calls to user meta-predicates would not be
visible to the built-in debugger.
Improved Logtalk compiler error checking for accidental redefinition of
control constructs.
Improved Logtalk runtime error checking for message sending and "super"
control constructs when the message is only bounded at runtime.
Updated the exception terms thrown when sending messages to self in order
to use the ::/1 control construct for the culprit goal instead of the ::/2
control construct.
Simplified message sending implementation by removing the seldom used
control constructs that allowed sending the same message to a conjunction
or disjunction of objects.
Specify \+/1, call/1-N, and once/1 as built-in local meta-predicates.
Disallow using Logtalk and Prolog built-in meta-predicates as messages in
order to avoid conflicting semantics with user-defined object and category
meta-predicates. The Logtalk control constructs (,)/2, (;)/2, (->)/2, and
!/0 may still be used as syntactic sugar when sending a set of messages to
a single object.
Updated the Logtalk compiler to ensure that calls to the built-in meta-
predicate call/2-N within a category have the same semantics as other
built-in meta-predicates whose meta-arguments are goals.
Improved performance of the :/1 control construct when using dynamic
binding by adding a predicate lookup caching mechanism.
Added support for using the :/1 control construct with a non-instantiated
argument at compile-time (handled using dynamic binding at runtime).
Allow a variable clause body to be interpreted as a meta-call instead of
an instantiation error. Although is not recommended to use a variable as
a goal instead of using the call/1 built-in meta-predicate, this change
allows for uniform handling of variables as goals in clause bodies. Thanks
to Victor Noel for the bug report.
Updated the ECLiPSe config files in order to support the non-standard
*->/2 (aka "soft cut") control construct. Thanks to Victor Noel for the
bug report.
Updated the Ciao config file in order to support the non-standard if/3
(aka "soft cut") control construct.
Updated the Qu-Prolog config file in order to enable support for multifile
directives (version 8.9 or later is now required).
Updated the Windows installer in order to ensure compatibility with the
new CxProlog 0.97.3 version. Updated the CxProlog config file in order
to set the "underscore_variables" compiler flag to "dont_care".
The library object "varlist" is no longer derived from "list" as several
of the "listp" predicates are not meaningful or cannot be used with the
same modes. Added a new library protocol "varlistp". Corrected several
bugs in the implementation of the library object "varlist" predicates.
Thanks to Victor Noel for the bug report.
Added meta-predicates scan_left/4, scan_right/4, map/6-8, and partition/6
to the library object "meta". Optimized performance of the meta-predicates
fold_left/4, fold_right/4, include/3, exclude/3, map/2-8, and partition/4.
Added predicates partition/5, same_length/3, selectchk/3, and
subsequence/3 to the library objects "difflist" and "list".
Added predicates product/3 and selectchk/3 to the library object "set".
Updated the "puzzle" constraint example for SWI-Prolog to avoid leaking
"clpfd" predicates in query binding results. Thanks to Ulrich Neumerkel
for reporting the problem.
Corrected a bug in the "expansion" example that prevented some of the
example queries from working.
Simplified running the "poem" example.
2.36.0 - April 9, 2009
Added support for overriding Logtalk default compiler flags (specified
in the back-end Prolog compiler config files) using new settings files.
Logtalk will load a "settings.lgt" file in the startup directory. If
this file is not found, Logtalk will load a "settings.lgt" file in the
Logtalk user directory. Requires running Logtalk with a back-end Prolog
compiler supporting access to environment variables. Loading of settings
files from the Logtalk startup directory is only available when running
on Windows for B-Prolog, Ciao, GNU Prolog, SWI-Prolog, XSB, and YAP.
SICStus Prolog is incompatible with this new feature, requiring manual
loading of settings files after startup. Consult the "configs/NOTES.txt"
file for compatibility details for other Prolog compilers.
Updated the "cplgtdirs.*" scripts to copy an existing "settings.lgt" file
from the backup of the Logtalk user folder to the new Logtalk user folder.
Updated the Logtalk compiler and runtime and all the config files to use
the more standard call/N predicates instead of the call_with_args/N
predicates.
Improved the XML documentation automatically generated for objects and
categories by appending to the compilation mode all the active optional
features and the "threaded" and "synchronized" properties. Improved the
XML documentation automatically generated for synchronized predicates by
appending the "synchronized" property to the predicate compilation mode.
Improved error handling for the built-in predicates logtalk_load/2,
logtalk_compile/2, current_logtalk_flag/2, and set_logtalk_flag/2
when checking flag names and values.
Improved Logtalk compiler error and warning reporting by printing,
whenever possible, the range of lines where the problem was found
instead of printing only the starting line.
Added new object properties "complements", "context_switching_calls",
"events", and "dynamic_declarations". Added new category property
"events". These properties are defined whenever the corresponding
compiler flags are set to "allow" at the time of entity compilation.
Corrected a bug where some file-related entity properties would not
be stored when using back-end Prolog compilers that don't support
multifile predicates.
Corrected a bug (introduced in version 2.35.0) in the compilation
and processing of "super" calls for objects that both instantiate
and specialize other objects.
Corrected a bug (introduced in version 2.35.1) in the Logtalk compiler
that prevented compilation of Prolog modules as objects.
Corrected a bug in the implementation of the Logtalk built-in predicate
threaded/1 that would result in wasting space in the main thread message
queue with duplicated messages. Thanks to Rui Marques for the bug report.
Corrected a bug where the Logtalk compiler would report the number of
compilation warnings with the "report" compiler flag set to "off".
Updated the Logtalk compiler in order to avoid unwanted backtracking
during source file compilation and when calling the entity creation
built-in predicates.
The compiler flags "context_switching_calls", "startup_message", and
"altdirs" are no longer read-only flags in order to support changing
their default values from within "settings.lgt" files. The possible
values for the compiler flags "dynamic_declarations", "complements",
"context_switching_calls", and "events" are now "allow" and "deny".
Added a new read-only compiler flag "prolog_version". Renamed the
compiler flag "prolog" to "prolog_dialect".
Changed object compilation in order to restrict the use of the <</2
control construct to objects compiled with the "context_switching_calls"
compiler flag set to "allow".
Changed the "cplgtdirs.*" and installation scripts to no longer make a
copy of the "configs" directory in the Logtalk user directory. Updated
the customization instructions to advise users to edit the "settings.lgt"
file instead of editing the Prolog configuration files.
Changed the Windows installer script in order to create Logtalk startup
scripts that start from the current directory as returned by the "%CD%"
dynamic environment variable. This allows a shortcut to be simply copied
to a Logtalk project directory without requiring editing its properties
in order to set the startup directory to the project directory.
Updated the XSB-MT integration scripts to make all lookup cache dynamic
predicates thread private. Updated the XSB config file for version 3.2,
which is now required for running Logtalk.
Added a new '$lgt_prolog_feature'/2 predicate to all config files, used
for representing back-end Prolog supported features that are previously
represented by read-only compiler flags.
Added new '$lgt_environment_variable'/2, '$lgt_startup_directory'/1, and
'$lgt_user_directory'/1 predicates to all config files.
Changed the default value for the "startup_message" compiler flag to the
less verbose "flags(compact)".
Updated the config files of the Ciao, CxProlog, GNU Prolog, ECLiPSE, and
XSB compilers to set the default directory for temporary files depending
on the host operating-system.
Updated the config files of the Ciao, ECLiPSe, GNU Prolog, Qu-Prolog,
and SICStus Prolog compilers to return term position line numbers for
reporting warnings and errors.
Switched off use of multifile/1 directives for Amzi! Prolog due to its
buggy implementation on this Prolog compiler.
Updated the Ciao config file to workaround a weird bug in the read_term/3
predicate that prevented compilation of some Logtalk source files.
Updated the K-Prolog config files in order to make the definition of the
'$lgt_delete_file'/1 predicate compatible with Windows systems.
Updated the predicate comments in the library protocol "loopp" in order
to workaround the limitation on the maximum size of atoms in Qu-Prolog.
Removed the obsolete SWI-Prolog hook file "swi_set_logtalk_context.pl"
(the Logtalk control construct <</2 provides similar functionality).
Added a check/1 predicate to all objects in the "types" library. This
predicate differs from the existing valid/1 predicate by throwing an
exception when the argument is not valid instead of failing.
Added multifile and dynamic declarations for the logtalk_library_path/2
Logtalk predicate to the "libpaths/libpaths.pl" file. This change allows
use of Ciao as the back-end Prolog compiler without patching the Logtalk
compiler and runtime (but also results in a harmless warning when using
GNU Prolog).
Updated the POSIX integration scripts to export the environment variable
LOGTALK_STARTUP_DIRECTORY before starting Logtalk.
Changed the SWI-Prolog POSIX integration script to use the option "-s"
instead of the option "-f" in order to allow loading of any existing
user initialization file (".plrc" on POSIX systems; see the SWI-Prolog
reference manual) before loading the Logtalk files. On Windows the use
of the "-s" results in a weird double initialization bug.
Workaround a compilation error in the object "salt/3" in the "searching"
example when using SICStus Prolog as a back-end compiler.
2.35.1 - March 1, 2009
Allow explicitly qualified module calls in the body of category and object
predicate clauses without requiring the calls to be wrapped within a {}/1
control construct to ensure successful compilation. This requires an hack
in the config files of most back-end Prolog compilers with module systems
as the implementations of the predicate_property/2 built-in predicate
cannot be used to test if :/2 is a built-in control construct. Updated the
config files of Amzi! Prolog, Ciao, IF/Prolog, Quintus Prolog, SICStus
Prolog, SWI-Prolog, XSB, and YAP.
Improved the Logtalk compiler compatibility with Prolog meta_predicate/1
directives that use the integer zero as an alternative to the atom ':' for
denoting meta-arguments that are goals.
Added limited support for calling Prolog meta-predicates defined in module
libraries (meta-arguments must be goals, not closures; the Logtalk compiler
assumes that an imported_from/1 property is defined for these predicates).
Implemented a "warnings" value for the "report" compiler option, providing
a less verbose compilation reporting where only warnings are printed.
Corrected a Logtalk compiler bug where warnings related to synchronized
predicates would be reported even with the "report" flag set to "off".
Added support to the message sending mechanisms for using the object proxy
access notation when the message receiver is only known at runtime.
Changed the semantics of the Logtalk notation for accessing object proxies
when sending a message to allow backtracking over the proxy goal.
Updated the Logtalk compiler to avoid reporting multiples reference to the
same unknown parametric object.
Corrected a bug in the implementation of the "smart_compilation" compiler
flag that would result in a misleading successful compilation of a source
file containing syntax errors after the first failed compilation when the
errors are not corrected between compilations. Thanks to Joerg Schuster
for the bug report.
Added a '$lgt_delete_file'/1 predicate to all config files. For back-end
Prolog compilers that don't support a built-in predicate for deleting
files, the '$lgt_delete_file'/1 predicate simply fails. This predicate is
used by the Logtalk compiler to ensure correct behavior of the compiler
flag "smart_compilation".
Updated the YAP config file to ensure that the "syntax_errors" proprietary
flag is set to "error".
Integration with GNU Prolog now requires version 1.3.1 or later of this
compiler.
Added a workaround to the ECLiPSE config files in order to support smart
compilation of source files (due to the non-standard implementation of the
read_term/3 predicate that fails for syntax errors instead of throwing an
exception).
Updated the library object "term", adding a singletons/2 predicate and
renaming the predicate vars/2 to variables/2 (the old name is still
available but shall be considered deprecated). Both the variables/2 and
the singletons/2 predicates return variables ordered as found when doing
a depth-first, left-to-right term traversal. Optimized the implementation
of the predicates ground/1 and variables/2 to use the Prolog built-in
versions of these predicates when available.
Moved the Prolog Integration and Migration Guide into the User Manual.
Updated the "BIBLIOGRAPHY.bib" file with recent Logtalk publications.
Updated the "build_release.sh" POSIX shell script steps for building the
MacOS X installer.
Updated the Windows installer to disable by default the installation of
the integration shortcuts for Ciao Prolog and Quintus Prolog as these
compilers require patches that render Logtalk incompatible with the other
compilers.
Simplified loading and testing instructions for the XML parser included
in the "contributions" directory. Added a missing logtalk_library_path/2
entry for XML parser directory.
2.35.0 - January 16, 2009
Improved compilation of source code resulting in smaller intermediate
Prolog files and better performance for most back-end Prolog compilers.
Improved caching of message sending predicate lookups (by generating
more reusable cache entries for public predicates, improving lookup
performance and cache hits).
Improved caching of ^^/1 calls (by generating more reusable cache entries,
improving lookup performance and cache hits).
Simplified compilation of meta-predicates. Allow meta-predicates to be
specialized and called using the ^^/1 control construct.
Simplified and improved performance of the multi-threading built-in
predicates within the context of the pseudo-object "user" (e.g. for
top-level queries).
Changed compilation of once/1 goals in debug mode in order to make them
explicit when tracing using the built-in debugger.
Added support for multiple source-level and entity-level initialization/1
directives (matching the ISO Prolog standard and current Prolog practice).
Corrected a bug in the compilation of top-level queries for the Logtalk
built-in predicates.
Corrected a predicate scope checking bug when using the dynamic-binding
cache entries.
Corrected a bug when compiling entities in debug mode that contain
initialization goals. Thanks to Parker Jones for the bug report.
Corrected a bug in the library object "meta" where the deprecated
predicates filter/3 and succeeds/2 are declared (using aliases) but
not defined.
Changed the formulas used for calculating sample skewness and sample
kurtosis to match the formulas used in statistical software such as R.
Added declaration for the proprietary findall/4 meta-predicate to the
SWI-Prolog and YAP config files.
Corrected processing of the proprietary load_foreign_files/3 directive
in the YAP config file.
Switched off use of multifile/1 directives for Ciao due to its buggy
implementation on this Prolog compiler.
2.34.1 - December 15, 2008
Allow the ^^/1 control construct to be used for calling any inherited
predicate instead of being restricted to calling inherited predicates
in the context of their redefinitions.
Updated the Logtalk compiler to detect (and report as an error) the
definition of two entities with the same name in a source file.
Updated the Logtalk compiler to detect (and report as an error) any
invalid relation between an entity and itself. In most cases, these
errors could result in predicate lookup endless loops.
Corrected a long-standing bug in the implementation of the Obj<<Pred
control construct, which failed to properly set the execution context
to the receiving object for top-level queries. This bug, which results
in a stack overflow error, was uncovered by an unrelated bug fix in the
previous Logtalk version.
Fixed some broken links in the Logtalk XHTML documentation. Updated the
screen CSS file to match the new, lighter style of the Logtalk website.
Updated the "testing" example to take into account the recently added
"dynamic_declarations" compiler flag.
Added a set of double-clickable *.command Terminal.app files for starting
Logtalk with selected back-end Prolog compilers on MacOS X.
Updated the MacOS X installer postflight script to open the Logtalk
installation folder, the *.command files folder, and the "README.txt"
file.
Updated the "BIBLIOGRAPHY.bib" file with recent Logtalk publications.
2.34.0 - November 26, 2008
Added conditional compilation support, as found in some Prolog compilers,
using the new directives if/1, elif/1, else/0, and endif/0. The arguments
of the if/1 and elif/1 directives are subjected to goal expansion.
Added a "prolog" read-only compiler flag whose value is the name of the
back-end Prolog compiler (an atom). This flag can be used for conditional
compilation of Prolog specific code.
Added an expand_goal/2 built-in method to support explicit calls to the
goal_expansion/2 user-defined hook. Updated the term expansion mechanism
to allow the expansion to be a single term instead of a list of terms.
Improved the documentation of the term and goal expansion predicates.
Simplified the implementation of the threaded/1 built-in predicate.
Removed support for the deprecated message_queue_create/1 Prolog built-in
predicate.
Corrected a bug in the implementation of the predicate_property/2 built-in
method which would return wrong meta-predicate templates for predicate
aliases.
Corrected a bug in the compilation of meta-calls to predicates defined
in the pseudo-object "user".
Corrected a bug that prevented goal expansion of source file initialization
goals (expressed using the initialization/1 directive).
Modified the "statistics" library to use the variance numerically stable
algorithm to calculate accurate values for the standard deviation for both
samples and populations. Thanks to Parker Jones for the bug report. Added
calculation of sample and population kurtosis.
Added predicates included/3, excluded/3, fold_left/4, and fold_right/4
to the library entities "metap" and "meta" (requested by Paul Crocker).
Renamed the predicates filter/3 and succeeds/2 to included/3 and map/2,
respectively (the older names are still available using aliases defined
in "meta").
Changed the file name extension of all config "*.config" files to "*.pl".
Changed the file name extension of all library "*.notes" files to "*.txt".
Updated the "metapredicates" example with Paul Crocker's contributions
to illustrate the use of some of the meta-predicates implemented in the
Logtalk library.
Updated the "expansion" example to illustrate the new expand_goal/2
built-in method. Improved example documentation.
Added an example, "cc", of using conditional compilation directives to
implement a portable operating-system interface for selected back-end
Prolog compilers.
Added an example, "prototypes", illustrating the concept of "prototype".
Added syntax coloring support for the new expand_goal/2 method and for
the if/1, elif/1, else/0, endif/0, set_logtalk_flag/2, ensure_loaded/1
and, set_prolog_flag/2 directives to the supported text editors and
syntax highlighters.
Fixed a block comment syntax coloring bug in the support for the Highlight
syntax highlighter with the help of André Simon.
2.33.2 - November 3, 2008
Added support for using the set_logtalk_flag/2 directive in source files.
This directive is executed when read (thus affecting the compilation
of the source code that follows) but its scope is restricted to the source
file being compiled.
Allow a complementing category to define aliases for predicates of the
complemented object.
Improved reporting of line numbers for syntax warnings and errors when
using YAP or SWI-Prolog as back-end compilers (requires YAP git version).
Improved reporting of entity existence errors for top-level queries.
Implemented a more flexible internal representation of entity properties.
Added entity properties file(File, Path) and lines(Start, End) for
entities compiled and loaded from source files. The property lines/2 is
only available when using YAP or SWI-Prolog as back-end compilers.
Added missing "built_in" properties for the built-in protocols "expanding"
and "monitoring".
Corrected a bug where compiler options are not cleared after compilation
of source files. This bug would result in wrong compilation of messages
sent from the top-level interpreter (i.e. messages sent by the pseudo-
object "user") whenever events or hooks compiler options are used.
Updated the Logtalk compiler to print a warning when defining clauses for
the built-in predicates term_expansion/2 and goal_expansion/2 without a
reference to the built-in protocol "expanding".
Updated the Logtalk compiler to provide file information when printing
redefined entity warnings if the files of the new and the old definitions
are different (requires support for the file/2 entity property).
Updated the Logtalk compiler to prefix all informative messages with the
line comment character, "%", to make it easier to use interactive section
transcripts as scripts.
Corrected a bug that prevented using synchronized/1 predicate directives
within protocols.
Corrected a bug where portability warnings would be reported even when the
"report" compiler option is turned off. Corrected a bug where portability
warnings would not increment the warnings counter.
Added an optimization and safety compiler option, "complements", that
allows objects to be compiled with support for complementing categories
either enabled or disabled. The default value (set in the config files)
is "off" (disabled).
Added an optimization and safety compiler option, "dynamic_declarations",
that allows objects to be compiled with support for dynamic declaration of
predicates (using the built-in database methods asserta/1 and assertz/1)
either enabled or disabled. The default value (set in the config files) is
"off" (disabled).
Updated the Logtalk built-in debugger to print goal invocation numbers
and to accept the return and enter keys as alternatives to the "c" key
("creep") when tracing. Updated the implementation of the "display"
command to include the write options quoted(false) and numbervars(false)
(as common in most Prolog debuggers). Added a "unify" command.
Modified the implementation of the built-in predicate define_events/5 to
throw an exception when the monitor object doesn't define the required
event handler methods (previously the define_events/5 call would simply
fail).
Added a customized version of the read_term/2 predicate to all config
files that returns the line where a term starts for back-end Prolog
compilers whose implementation of the read_term/2 predicate supports
this information.
Updated the shortcut created by the Windows installer for integration with
K-Prolog to require version 6.0.4 of this compiler.
Updated the User Manual comparison between Logtalk nomenclature and C++
and Java nomenclatures.
Added a simple example, "instvars", illustrating how to define instance
variables, default variable values, and setter and getter methods.
Added a simple example, "classmethods", illustrating how to define
"class methods" as found on class-based object-oriented programming
languages.
Improved the documentation of the "complements", "hello_world", "hooks",
and "msglog" examples.
Added a new logic puzzle programming example, adapted with permission
from Kevin Stone's BrainBashers website (http://www.brainbashers.com/).
Updated all the examples that make use of event-driven programming
("birthdays", "bricks", "complements", "msglog", "polygons", "profiling",
and "searching") to ensure correct functionality after fixing the bug in
cleaning compiler options after compilation of source files.
Updated the "dynpred" example to use the new "dynamic_declarations"
compiler option. Updated the "complements" example to use the new
"complements" compiler option.
Corrected a Vim syntax coloring bug with line comments occurring within
entity opening directives.
2.33.1 - October 12, 2008
Added a syntax construct for easy access to parametric object proxies
represented as Prolog facts when sending a message ({Proxy}::Message).
Updated the "proxies" example to illustrate this new functionality.
Improved the Logtalk built-in debugger to print clause numbers for
static predicates at the unification ports ("fact" and "rule").
Modified the built-in methods create_category/4, create_object/4 and
create_protocol/3 to accept a variable as the first argument, which
will be instantiated to the identifier generated for the new entity.
Modified the database built-in methods to allow initialization of static
predicates for dynamic objects when the predicates are declared in "this".
These changes simplify the initialization of dynamic objects when writing
constructors. The dynamic objects must be descendants of "this".
Fixed a bug in the Logtalk compiler that would result in failure to
restore the operator table in case of compilation error.
Removed support for the deprecated mutex_create/1 Prolog built-in
predicate.
Updated the XSB config file by switching off the use of multifile/1
directives when compiling Logtalk source files as a workaround for know
bugs in the implementation of this directive for dynamic predicates.
Updated the ECLiPSe 6.0 config files in order to switch on the use of
multifile/1 directives.
Update the CxProlog config file to work with and require version 0.97.2.
Updated the Windows installer to warn the user when it fails to detect
the installation of the selected Prolog compilers. Fixed a bug where the
creation of the K-Prolog integration shortcut could fail when performing
a custom installation. Fixed a bug in detecting a CxProlog installation.
Added a library for descriptive statistics. For details, see the file
"library/statistics.notes".
Added a new library object, "pairs", defining predicates over lists of
pairs (key-value terms).
Added a new library object, "gensym", defining predicates for generating
unique atoms (object protocol based on the "gensym" module of SWI-Prolog).
Added a predicate partition/4 to the library entities "metap" and "meta".
Added predicates plus/3 and succ/2 to the library object "integer".
Added predicates is_ascii/1, is_white_space/1, is_quote/1, is_period/1,
is_punctation/1, and parenthesis/2 to the library entities "characterp"
and "character".
Modified the implementation of the predicate product/2 in the library
object "numberlist" to fail for empty lists.
Added an example, "people", illustrating a simple implementation solution
for object constructors.
Improved "metainterpreters" example.
Improved performance of the object initialization and release predicates
defined in the category "initialization" of the "roots" example.
2.33.0 - September 1, 2008
Applied several optimizations to the Logtalk compiler, mostly related to
non-detected deterministic predicates due to calls to dynamic predicates
or due to limitations in clause indexing by most Prolog compilers.
Added support for using Prolog use_module/2 directives in objects and
categories. This allows module predicates to be called using implicit
qualification, improving readability. The use_module/2 directive supports
the declaration of predicate aliases using the notation Original:Alias.
Added support for meta-calls whose closure arguments are explicitly
qualified (using either Object::Closure or Module:Closure).
Added support for using the ensure_loaded/1 and the set_prolog_flag/2
directives in source files. These directives are both processed when
read (thus affecting the compilation of the source code that follows)
and copied to the generated intermediate Prolog files.
Corrected a set of singleton variable related bugs in the Logtalk compiler
and runtime. Thanks to Joachim Schimpf and Kish Shen work on the improved
singleton variable checking code found on the new ECLiPSe 6.0 compiler.
Simplified the implementation of the Logtalk built-in debugger. Changed
the implementation of the debugger abort command to use the de-facto
standard Prolog built-in predicate abort/0. Corrected a bug that prevented
the use of the command "ignore" at the redo port.
Removed the Logtalk dispatcher thread used for dispatching asynchronous
multi-threading calls, simplifying the implementation and improving the
performance of the asynchronous built-in multi-threading predicates.
Corrected a bug in the implementation of the threaded_once/1-2 built-in
multi-threading predicates (use of detached threads could make the methods
fail despite the success of the thread goals).
Improved performance of multi-threading applications (specially on MacOS X)
when using SWI-Prolog as the back-end compiler by making the lookup caches
thread local.
Small performance improvement of the threaded/1 built-in multi-threading
predicate.
Added a multifile/1 directive for the logtalk_library_path/2 predicate.
Corrected a bug in the verification of portable calls that would fail to
flag the soft-cut control construct (_ *-> _; _) found on some Prolog
compilers.
Corrected a bug in the implementation of the built-in database predicates
retract/1 and retractall/1 when adding a cache entry for a local dynamic
predicate with no scope declaration.
Corrected a bug in the compilation of source file op/3 directives whose
third argument is a list of operator specifiers instead of a single
operator specifier.
Added ECLiPSe 6.0 config files. Modified the POSIX script "eclipselgt"
to test for both ECLiPSe 5.10 and 6.0 versions. Added Windows shortcut
to start Logtalk with ECLiPSe 6.0.
Updated the GNU Prolog config file to allow Logtalk to recognize as
built-in predicates the finite domain solver built-in predicates.
Added a new set of examples, "constraints", illustrating how to use the
Constraint Domain Solver libraries available with B-Prolog, ECLiPSe,
GNU Prolog, SWI-Prolog, and YAP. Thanks to Markus Triska for his help
with the YAP and SWI-Prolog CLP(FD) examples.
Updated the "mtbatch" example to provide multi-threading overhead data
for the competitive or-parallelism benchmark.
2.32.2 - July 26, 2008
Simplified the predicate lookup linking clauses that are generated when
compiling private and protected entity relations, resulting in a small
runtime performance improvement when looking up non-cached predicate
declarations.
Simplified and optimized handling of predicate aliases when looking up
predicate declarations and predicate definitions.
When sending a message to an object using the ::/2 control construct,
also check if the sender matches the scope container when the message
does not correspond to a public predicate. This is necessary in order
to allow calling a protected or a private predicate in "this" from
within a category.
Updated the Logtalk compiler to throw an error when detecting a call
to a dynamic predicate in the body of a predicate clause defined in a
category.
Optimized the implementation of the ^^/1 control construct. The Logtalk
compiler now requires an instantiated, callable argument that must have
the same functor and arity of the predicate being (re)defined.
Allow the ^^/1 control construct to be used within extended categories.
Updated the "engines" example to illustrate this new functionality.
Moved support for categories that complement existing objects from the
code generated when compiling objects to the Logtalk runtime, making the
implementation of this feature easier to maintain and contributing to
smaller code sizes of the intermediate Prolog files.
Corrected a typo in the exception term throw by the built-in database
method assertz/1 when an error occurs while trying to assert a fact.
Restored the redefined entity warnings for back-end Prolog compilers
that support multifile predicates (broken in the final version of 2.32.1).
Changed the format of the Logtalk compiler informative messages for
better readability.
Improved simplification of the clauses generated by the compilation of
object and category predicate clauses.
Corrected a bug that prevented asserting and retracting clauses in "this"
from within a category.
Corrected a bug in the implementation of the built-in database method
retractall/1 when retracting clauses in an object compiled in debug mode.
Thanks to Parker Jones for the bug report.
Updated all config files due to changes to the predicate used to declare
proprietary meta-predicates, '$lgt_pl_meta_predicate'/1. Added a second
argument to represent if the meta-predicate is either a built-in predicate
or a built-in control construct. This is necessary in order to properly
compile calls to these proprietary meta-predicates when in debug mode.
Thanks to Victor Noel for the bug report.
Corrected a bug in the config files hooks used in handling proprietary
Prolog directives for the SWI-Prolog, B-Prolog YAP, SICStus, and XSB
Prolog compilers. Added a new internal predicate for constructing
predicate indicators for compiled entity predicates that simplifies the
config files hooks used in handling proprietary Prolog directives.
Changed the valid values of the read-only compiler flag "break_predicate"
to "supported" and "unsupported" for consistency with other read-only
compiler flags.
Updated the SWI-Prolog config file to set the Prolog flag "optimise" to
true. Added declaration for the setup_and_call_cleanup/3 meta-predicate.
Removed setting of the deprecated "prompt_alternatives_no_bindings"
Prolog flag. Oldest SWI-Prolog compatible version is now 5.6.44.
Updated the GNU-Prolog config file, adding a declaration for the
call_det/2 proprietary meta-predicate. GNU-Prolog version 1.3.0 or
later is now required.
Added list mapping predicates map/4 and map/5 to the "metap" library
protocol and the "meta" library object.
Added a proper definition for the predicate select/3 to the "varlist"
library object.
Added a new example, "logging", of using a category to define a set of
predicates that handle a dynamic predicate in the context of "this"
(i.e. in the context of the objects importing the category).
Added a new multi-threading example, "integration2d", implementing methods
for numerical integration for functions of two variables, contributed by
Paul Crocker.
Updated the "integration" multi-threading example by bringing all example
functions under the same object in order to allow for static binding. This
is essential for good results in operating-systems with poor mutex thread
synchronization performance such as MacOS X.
Added experimental support for the GeSHi syntax highlighter, contributed
by Clara Dimene.
Improved support for the Pygments syntax highlighter, correcting coloring
bugs when there are single line comments in the same lines of an opening
entity directive.
2.32.1 - July 7, 2008
Restored the redefined entity warnings for back-end Prolog compilers
that support multifile predicates. Simplified updating of the runtime
tables when compiling and loading source files with back-end Prolog
compilers that don't support multifile predicates.
Changed the representation of the runtime tables for loaded entities
in order to drop the need of a "functors clause" per entity. This avoids
some redundancy on the representation of entity functors and also helps
reducing a bit the size of the generated Prolog files.
When reloading an object, also clean all entries in the event handlers
table where the object plays the role of a monitor.
Modified the Logtalk runtime to clean all lookup caches when compiling
and loading source files (instead of doing it only when the files
redefine existing entities).
Corrected a bug that prevented using predicate aliases with the :/1
control construct without static binding.
Updated the CxProlog config file to take advantage and require the new
0.97.1 version (which implements some more ISO Prolog predicates and
expands support for text encodings).
Updated the B-Prolog config file to take advantage and require the new
7.1 version (which adds support for the multifile/1 predicate directive).
Updated the SWI-Prolog config file notes about possible compatibility
issues with the default setting of the proprietary "iso" Prolog flag
to "true".
Updated the SWI-Prolog hook file, "swihook.pl", to avoid hijacking the
arguments of use_module/1-2 calls (which resulted in wrongly loading
Logtalk libraries with the same name as the SWI-Prolog library modules
we intended to load).
Updated the "k6.config" config file for the K-Prolog 6.0.3 release.
Renamed the K-Prolog 5.1.x config file from "k.config" to "k5.config"
to avoid being mistaken for the K-Prolog 6.0.x config file. Updated
the "plclgt.sh" integration script to work with both K-Prolog 5.1.x
and 6.0.x versions.
Renamed the SICStus Prolog 3 config file from "sicstus.config" to
"sicstus3.config" to avoid being mistaken for the SICStus Prolog 4
config file.
Updated the POSIX integration scripts and the Windows installer script
to detect outdated versions of the Logtalk user folder (setting the
compatibility version to 2.32.0 or later).
Improved the Prolog migration guide on converting code that makes use
of multifile predicates.
Added note on licensing conditions to several files. Clarified copyright
and license conditions for files on the "contributions" folder. Clarified
dual-licensing conditions for text editor and syntax highlighter
supporting files. Added license file to the TextMate bundle.
Updated support for the Vim text editor (changed the Logtalk file type
plug-in to set the path to the completion dictionary and updated the
installation instructions).
Updated the support for the Pygments syntax highlighter to avoid marking
as errors non-standard directives.
2.32.0 - June 16, 2008
Updated the Logtalk compiler and runtime to use multifile predicates for
the runtime tables of loaded entities and entities relations. This is
necessary to generate sensible intermediate Prolog code for large files
with tens of thousands of objects. The workaround of using the directive
initialization/1 is still available (for now) for Prolog compilers that
fail to support the thirteen years old ISO Prolog standard.
Updated the Logtalk runtime error handler to test for non-instantiated
exception terms. Thanks to Joerg Schuster for the bug report.
Corrected two bugs in the implementation of the built-in meta-predicate
threaded/1 when canceling individual threads. The first bug resulted from
out-of-order thread status messages. The second bug resulted from a leak
of thread results between calls to the threaded/1 predicate. Changed the
thread cancellation process to not automatically releasing any locks,
leaving that task to a catcher associated to the thread goal.
Added a new default compiler option, multifile_directive, to all config
files. Possible values are "supported" and "unsupported".
Added instructions on how to patch the Logtalk compiler in order to use
Quintus Prolog as the back-end compiler.
Removed from the YAP POSIX integration script the command-line options
setting the initial stack, heap, and tail data area sizes. These settings
are no longer necessary for recent YAP versions.
Updated the Windows installer script to search the registry for the
location of the YAP installation (for YAP 5.1.3 or later versions).
Added missing implementation of the predicate as_dictionary/2 to the
"bintree" library object. Thanks to Victor Noel for the bug report.
Updated all the search methods in the "searching" example to delegate
checking for cycles to the state space being searched (thus allowing
state descriptions to carry additional information that should not be
taken into account when comparing states). Updated the "salt" example
to support heuristics.
Updated the "mtbatch" example to include a benchmark test for competitive
or-parallelism applied to state-space search (using the resources from the
"searching" example). Improved the example documentation.
Added a filetype plugin for the Vim text editor. Updated the installation
instructions. Updated the syntax coloring support to properly highlight
quoted atoms and strings in the opening directive of parametric objects.
Fixed an auto-indentation bug when opening and closing a conditional
block in a single line in the last goal a predicate clause body. Thanks
to Victor Noel for the bug report.
Corrected missing installation of the "VERSION.txt" file when building
Linux RPMs.
2.31.6 - May 26, 2008
Fixed a Logtalk runtime bug when using the :/1 control construct to
call a predicate defined in a category extended by a category that
is imported by the object making the call.
Fixed a Logtalk compiler bug when compiling an alias/3 predicate
directive within a category that extends other categories.
Fixed a Logtalk compiler bug when compiling a class that imports a
category that extends other categories. Thanks to Victor Noel for
the bug report.
Small performance improvement to the caching of category predicates
when using static binding.
Removed from the YAP config file the definition of the forall/2
predicate, which have been added as a built-in predicate in YAP
version 5.1.3 (the current YAP CVS version must be used; the last
stable version, 5.1.2, is broken on Windows). Added support for
the proprietary if/1, else/0, elif/1, and endif/0 directives (when
used outside Logtalk entities).
Updated the SWI-Prolog config file with support for the proprietary
if/1, else/0, elif/1, and endif/0 directives (when used outside
Logtalk entities).
Improved the "complements" example, moving the category initialization
goal to the beginning of the example source file.
Added support for the Pygments syntax highlighter (co-developed with
Clara Dimene).
Added a new sample Logtalk source file for testing syntax coloring
support.
Added missing auto-completion keywords for the ISO Prolog standard
arithmetic functions to the SubEthaEdit, TextMate, Notepad++, jEdit,
Vim, and Smultron text editors.
Corrected a bug in the SubEthaEdit syntax coloring support for the
imports_category/2-3 built-in predicate. Added some missing files
(license and mode settings) to the SubEthaEdit mode bundle.
Corrected a bug in the Vim syntax coloring support for the ISO Prolog
built-in predicate current_char_conversion/2 and added missing support
for for quoted atom escape sequences.
Corrected a bug in the jEdit syntax coloring support for hexadecimal
numbers and added missing support for the extends_category/2-3 and
at_end_of_stream/0 built-in predicates.
Added missing support for the syntax coloring of the external call
Logtalk control construct, {}/1, to the Highlight package. Corrected
a bug with 0'Char constants and with octal and hexadecimal escape
sequences.
Added missing support for the syntax coloring of the external call
Logtalk control construct, {}/1, and for quoted atom escape sequences
to the TextMate text editor.
Added missing support for the syntax coloring of quoted atom escape
sequences and of the built-in predicate at_end_of_stream/0 to the
Source-highlight package.
Added missing support for the syntax coloring of the built-in predicate
at_end_of_stream/0 and of the scope operator ::/2 to the Kate text editor.
Improved syntax coloring of parametric object opening directives.
Added missing support for the syntax coloring of the built-in predicate
unify_with_occurs_check/2 to the Emacs text editor. Corrected a bug in
the syntax coloring of arithmetic comparison operators.
Added missing support for the syntax coloring of quoted atom escape
sequences and of the built-in control construct call/1 to the
GtkSourceView 2.x text widget.
Added missing support for the syntax coloring of variables, of quoted
atom escape sequences, of the built-in method clause/2, of the external
call Logtalk control construct {}/1, and of variables to the Nedit text
editor. Corrected a bug with 0'Char constants and corrected some typos
in the support for the current_event/2, implements_protocol/2-3, and
abolish_category/1 built-in predicates.
2.31.5 - April 29, 2008
Added support for checking arithmetic expressions for calls to
non-portable functions when using the "portability" compiler flag.
Updated the implementation of the threaded/1 built-in predicate to
ensure that thread creation errors (usually, virtual memory address
space exhaustion) result in the corresponding exception rather than
in a non-terminating call. Improved cancellation of all individual
threads when one of them terminates with an exception or a failure.
Simplified the terms used to post individual results from threaded/1
calls to the queue associated to the call.
Corrected a bug in the built-in predicate threaded/1 when its argument
is a conjunction (disjunction) of conjunctions (disjunctions).
Added a workaround for a mutex creation error when reloading a source
file with entities defining synchronized predicates.
Updated the Logtalk runtime to unlock all mutexes hold by a thread when
upon thread cancellation.
Corrected a Logtalk compiler bug that allowed a predicate to be declared
both dynamic and synchronized. Thanks to Paul Crocker for the bug report.
Corrected a Logtalk compiler bug where local definition clauses for
dynamic predicates are being generated for categories. Thanks to Victor
Noel for the bug report.
Updated the YAP and SWI-Prolog config files to set the default value of
the "tmpdir" flag depending on the host operating-system. Added missing
declaration for the multi-threading predicate thread_initialization/1.
Added missing declarations for some proprietary built-in meta-predicates
to the B-Prolog config file.
Corrected a bug in the SWI-Prolog config file in the declaration of the
proprietary built-in meta-predicate "soft cut". Thanks to Victor Noel
for the bug report.
Updated the XSB config file to use the new optimized call/N predicates
found on the current XSB CVS version.
Added an integration script, "xsbmt64lgt", for using Logtalk with the
multi-threaded, 64 bits version of XSB.
Simplified building of MacOS X Installer packages. Updated the Windows
installation script to use the "C:\lgtsvn" as base. Simplified manual
installation instructions.
Updated the definitions of the predicate valid/1 for the library objects
"list", "list(Type)", "numberlist", "set", "set(Type)", "varlist" to fail
for lists with unbound tails after discussion with Jan Wielemaker and
Ulrich Neumerkel.
Corrected a bug in the library object "lgtunit" when running "throws"
tests (make sure the generated exception is subsumed by the expected
exception). Added a "lgtunit_loader" loader utility file for loading
the Logtalk unit test library.
Added a simple example, "debug_hooks", of using compilation hooks and
term expansion for conditional compilation of debug statements.
Updated the "primes" multi-threading example to allow any number of
threads to be used in the computation of primes numbers.
Added a new multi-threading example, "integration", implementing
Recursive Gaussian Quadrature Methods for Numerical Integration for
functions of a single variable, contributed by Paul Crocker.
Added a new multi-threading example, "mtbatch", for benchmarking
multi-threading performance.
Added a new example, "ack", implementing the Ackermann function (general
recursive function).
Added support for using the Highlight package (version 2.6.9 or later)
by Andre Simon with Logtalk source files.
Updated the TextMate Logtalk bundle and its configuration instructions
to make the "Compile" and "Generate ..." commands more general, making
it compatible with most Prolog compilers. Added syntax coloring for
standard arithmetic functions. Added a command for generating plain text
files from XML documenting files.
Corrected a syntax coloring bug with character codes using the 0'Char
notation in the SubEthaEdit 2.x and Vim text editors and in the
source-highlight package.
Removed some redundant regular expressions from the jEdit text editor
syntax coloring support files.
Corrected syntax coloring bugs with variables starting with underscores
(including anonymous variables) and with atoms containing an underscore
in the Emacs text editor. Thanks to Joerg Schuster for the bug report.
Updated the Logtalk grammar documentation to reflect the changes to
category relations introduced in version 2.31.0.
Added a "lgttxt.xsl" XSLT style-sheet and two shell scripts, "lgt2txt.sh"
and "lgt2txt.js", for converting XML documenting files into text files.
Updated the "lgt2*.sh" shell scripts for POSIX compliance, removing
dependencies on bash shell features.
Updated the "lgtxml.xsl" XSLT style-sheet to ensure that the generated
HTML files are fully compliant with the HTML 4.01 standard.
Updated the Debian installer package shell scripts for POSIX compliance,
removing dependencies on bash shell features.
2.31.4 - February 20, 2008
Optimized the performance of threaded/1 calls by using a per-call
message queue for collecting the individual call results and by
using the message queue identifier as a tag for the individual
calls. This solution avoids runtime synchronization of a large
number of threads on the same message queue, simplifies compilation
and runtime handling of threaded/1 calls, and simplifies thread
cancellation, eliminating any risk of dangling individual thread
results.
Removed two redundant calls to the built-in predicate thread_exit/1
on the Logtalk compiler.
Corrected a bug where a competitive or-parallelism call would
prematurely fail with one or more individual calls still pending.
Corrected a bug where a competitive or-parallelism call would succeed
when all the individual calls had failed.
Corrected a bug when compiling calls to the Logtalk multi-threading
built-in predicates made from the top-level interpreter, i.e. from
within the pseudo-object "user".
Added foreach/3, forto/5, and fordownto/5 meta-predicates to the
library object "loop". Updated the definitions of the forto/3-4
and fordownto/3-4 meta-predicates to allow the use of arithmetic
expressions as arguments for convenience and clarity.
Corrected a bug in the implementation of the predicate lookup/3 in
the library object "bintree".
Added a multi-threading example of the Fast Fourier Transform, "fft",
contributed by Paul Crocker.
Corrected a bug in the implementation of the bisection algorithm in
the multi-threading example "functions". Added an implementation of
the MATLAB humps function (contributed by Paul Crocker).
Updated the multi-threading example "sorting" to workaround a mutex
performance issue with XSB when generating lists of random numbers.
Updated support for the TextMate text editor. Added a command for
generating the PDF documentation of open source files. Added missing
tab triggers to the Logtalk snippets. Updated installation notes.
Corrected a bug in the jEdit syntax coloring support for the is/2
operator.
2.31.3 - January 28, 2008
Added a "VERSION.txt" file that is used to check compatibility between
an existing Logtalk user folder (whose path is stored in the LOGTALKUSER
environment variable) and a new Logtalk version.
Updated the POSIX Prolog integration scripts to check for an outdated
Logtalk user folder, creating a new one if necessary by running the
"cplgtdirs" script (a backup is automatically made of the old directory).
Updated the Windows installer to create a registry key with the Logtalk
version number and to check for an outdated Logtalk user folder.
Changed the predicate used to load Prolog files, adding an additional
argument that represents a list of load/compile options (notably,
encoding/1, which is necessary for supporting source files encodings
such as ISO-8859-X).
Updated the SICStus Prolog 4 config file to also accept UCS-2 encodings
when using the encoding/1 directive (UCS-2 is subsumed by UTF-16).
Added a workaround to the Quintus Prolog integration scripts for its
lack of support for expanding environment variables in file names.
2.31.2 - January 21, 2008
Extended compatibility of the experimental Logtalk encoding/1 directive
to CxProlog 0.96.3 and SICStus Prolog 4.0.2 and improved support for YAP
and SWI-Prolog.
Improved source file encoding handling by ensuring that a BOM present
in a source file being compiled is inherited by the generated Prolog
and XML files.
Changed the atoms used to represent different encodings when using the
encoding/1 directive; Logtalk now uses the encoding names specified by
IANA (using the preferred MIME name whenever available).
Updated the Logtalk compiler to throw an exception when the specified
encoding is not supported by the used back-end Prolog compiler.
Updated the "encodings" example to use the new encoding names and added
new source files using UTF-16 and UTF-32 text encodings.
Added POSIX and Windows integration scripts for Quintus Prolog.
2.31.1 - January 3, 2008
Duplicated the range of threaded_call/2 tags for multi-threading Prolog
compilers with bounded integers.
Updated the YAP config file to set the flag "language" to "iso". This
is not strictly necessary to run Logtalk with YAP but it helps prevent
nasty surprises when writing portable applications that rely on ISO
Prolog semantics.
Updated the SWI-Prolog integration script to test for the availability of
the XPCE library before trying to load the "xpcehook.pl" XPCE hook file.
Updated the Linux (RMP and Debian) and MacOS X package build scripts to
include Prolog version compatibility information.
Updated the "tak" multi-threading example to allow parameterization of
the number of threads to use.
Updated the "sorting", "hanoi", and "fibonacci" multi-threading examples
to interpret the object parameter as the number of leaf threads (i.e.
working threads that will not recursively create additional threads).
Updated the TextMate text editor support to include commands to compile
and to automatically generate the XHTML documentation of open source
files.
2.31.0 - December 21, 2007
Added a new built-in protocol, "expanding", declaring goal_expansion/2
and term_expansion/2 public predicates.
Added compiler support for user-defined goal expansion hooks. Changed
the implementation of compiler term and goal expansion hooks to use
object-defined predicates term_expansion/2 and goal_expansion/2.
Changed the compiler option "hook" to accept object identifiers.
Allow a category to explicitly complement an existing object, thus
providing functionality similar to Objective-C categories. Added
complements_object/2 built-in predicate. Added a new example,
"complements", illustrating the new category functionality.
When constructing a new category from other categories, the relation
"extends" is now used instead of the relation "imports". The relation
"imports" is now only used when an object imports a category. Added
extends_category/2-3 built-in predicates.
Modified the built-in predicate define_events/5 to throw an existence
error instead of failing when the specified monitor object does not
exists.
Updated the Logtalk compiler to convert version numbers to atoms when
generating XML documenting files (thus avoiding problems with some
Prolog compilers that resulted in version numbers with a large number
of fractional digits).
Improved updating of runtime bookkeeping tables when loading source
files.
Renamed the predicate property "alias/1" to "alias_of/1" in order to
disambiguate its meaning.
Added a new config file, "k6.config", for the K-Prolog 6.0 beta
version.
Updated the B-Prolog config file to recognize mode/1 directives.
Added some missing meta-predicate specifications to the config files
of XSB and YAP.
Updated the Windows GUI installer to support running Logtalk with
CxProlog 0.96.1 and later versions.
Added two new multi-threading examples, "fibonacci" and "hanoi", and
corrected a bug in the recursive creation of threads on the "sorting"
example. Updated the "primes" multi-threading example to also support
eight threads.
Updated the "hooks" example for illustrating goal expansion hooks in
addition to term expansion hooks.
Updated the "engines" example for compliance with the changes made
to category relations.
Added syntax coloring support for the new goal_expansion/1,
complements_object/2, and extends_category/2-3 predicates to all
supported text editors.
Updated the TextMate code snippets to use the TM_FULLNAME variable
instead of the deprecated "niutil" command to retrieve the user full
name. Thanks to Michael Sheets for the update.
2.30.8 - November 9, 2007
Fixed bug in the compilation of synchronized predicates that breaks
Logtalk on single-threaded Prolog compilers.
2.30.7 - November 5, 2007
Updated the multi-threading built-in predicates threaded_notify/1 and
threaded_wait/1 to accept lists of notifications.
Added a new read-only compiler flag, "context_switching_calls", allowing
context switching calls to be disabled (they are enabled by default).
Updated the B-Prolog config file to recognize eager_consume/1 directives.
Updated the XSB config file to recognize use_subsumptive_tabling/1,
use_variant_tabling/1, index/1, thread_private/1, and thread_shared/1
directives.
Updated the YAP config file to recognize thread_local/1 directives.
Updated the SICStus Prolog config files to recognize volatile/1 directives.
Updated the SWI-Prolog config file to recognize thread_local/1, index/1,
and hash/1 directives.
Changed the backup directory names generated by the "cplgtdirs.*" shell
scripts to not include whitespace characters.
Updated the "xsbmtlgt.sh" integration script to start XSB-MT using the
new command-line option "--shared_predicates" (requires current XSB CVS
version). Updated the Windows GUI installer to support running Logtalk
with XSB-MT.
Added a multi-threading example, "barriers", of barrier synchronization.
Updated the "functions" example sample queries for compatibility with the
ISO Prolog standard regarding representation of float numbers.
Added a workaround for a parsing bug in XSB while compiling the "sicstus"
example.
2.30.6 - October 21, 2007
Replaced calls to the proprietary current_thread/2 predicate in the
Logtalk runtime by calls to the thread_property/2 predicate as per
the ISO DTR on multi-threading predicates. Added a goal_expansion/2
clause to the SWI-Prolog config file to automatically switch between
the current_thread/2 and thread_property/2 predicates depending on
availability.
Changed handling of the encoding/1 directive by the Logtalk compiler in
order to improve compatibility with YAP and SICStus Prolog. Removed from
the config files the now obsolete '$lgt_set_stream_encoding'/2 predicate
definition. Renamed the compiler option "supports_encoding_dir" to
"encoding_directive" and changed its possible values to "unsupported",
"full" (used in both Logtalk source files and compiler generated Prolog
files), and "source" (used only in Logtalk source files).
Renamed compiler option "underscore_vars" to "underscore_variables".
Renamed compiler option "supports_break_predicate" to "break_predicate".
Improved the performance of recursive predicate definitions synchronized
by mutexes. Explicitly create all mutexes used by an entity at load time
for compatibility with XSB. Several changes to multi-threading support in
order to improve compatibility with current and forthcoming versions of
YAP, SWI-Prolog, and XSB.
Updated the Logtalk compiler for compatibility with both logical and
immediate update semantics when compiling synchronized predicates.
Updated the meta-predicate compilation sanity checks to verify the
existence of the minimum number of normal arguments in a clause head
required by the closure of maximum arity.
Added a workaround for the lack of built-in support for character
unbuffered input when using the Logtalk built-in debugger to the config
files of ALS Prolog, B-Prolog, Ciao, CxProlog, IF/Prolog, JIProlog,
Prolog II+, SICStus Prolog, XSB, and YAP. Thanks to Parker Jones for the
bug report.
Updated the YAP config file to auto-detect working Unicode support when
setting the "encoding_directive" compiler option.
Updated the XSB config file to auto-detect multi-threading support
when setting the "threads" compiler option. Added an integration script
(xsbmtlgt.sh) and supporting files for the multi-threaded version of XSB
(requires current development version, available from the XSB CVS server).
Added a MacPorts portfile for building MacOS X installer packages.
Added a BOM to the "babel.lgt" UTF-8 file in the "encodings" example in
order to improve compatibility with SICStus Prolog.
Updated the library object "random" by replacing the synchronized/0
directive by a synchronized/1 directive listing only the predicates
that modify the random number seed.
Added syntax coloring support for the GtkSourceView 2.x text widget
(used e.g. on the Gnome's Gedit text editor and on the MonoDevelop IDE).
Removed syntax coloring for the obsolete atomic/1 predicate directive
from the support files of Source-highlight, Emacs, SubEthaEdit, jEdit,
and Kate. Optimized the regular expressions used in most syntax coloring
configuration files of supported text editors.
2.30.5 - September 19, 2007
Added new multi-threading built-in predicates threaded_call/2,
threaded_once/2, threaded_exit/2, and threaded_peek/2. These new
predicates support the use of threaded call identifier tags in order to
link specific threaded_call/2 and threaded_once/2 calls to specific
threaded_exit/2 and threaded_peek/2 calls. Extended the "nondet" example
in order to illustrate the new functionality.
Changed the implementation of the built-in predicate threaded_exit/1 in
order to avoid blocking when its argument is subsumed by the argument of
the corresponding threaded_call/1 call instead of being a variant.
Updated the Logtalk compiler to encapsulate resource errors inside
error/2 exception terms (as specified in the ISO Prolog core standard).
Corrected a bug in the library object "lgtunit" (wrong arity on two
failed_test/2 predicate calls).
Corrected two problems with the "testing" example: a wrong call on the
object "dyn_tests" and a missing entry in the "libpaths.pl" file. Removed
two pointless dynamic predicate directives in the "buffer" example.
Improved documentation of multi-threading programming and predicate
properties. Corrected the reference manual page describing the threaded/0
directive.
Simplified installation scripts by moving shared distribution cleaning
code into the "cleandist.sh" script. Updated the "install.sh" script to
set the installation prefix to "/usr" on Debian systems. Updated the
Linux RPM spec file in order to clean the building directory after the
package creation.
2.30.4 - August 22, 2007
Allow the argument of {}/1 calls to be a variable at compile time.
Updated the Qu-Prolog config file to match and require version 8.1 and
added a "qplgt" integration script.
Updated the XSB config file to match and require version 3.1 and to
take advantage of the compiler option optimize/1 when loading Logtalk
generated Prolog intermediate files.
Added a new library object, "lgtunit", providing preliminary support for
writing and running unit tests. Added a new example, "testing", defining
sample unit tests.
Added a new multi-threading example, "threads/tak", implementing the
Takeuchi function (recursive arithmetic).
Updated the "threads/philosophers" example to use notifications instead
of a dynamic predicate for representing chopstick availability. Added an
alternative implementation using a parametric object. Improved example
documentation.
Updated the "benchmarks" example to allow comparisons between calls to
imported category predicates and calls to local object predicates.
Updated Emacs support in order to fix problems with the syntax-coloring
of some Logtalk built-in predicates and applied a patch contributed by
Nicolas Pelletier to workaround a compatibility problem with XEmacs.
Updated jEdit support in order to fix a problem with the syntax-coloring
of the :/1 control construct.
2.30.3 - July 9, 2007
Updated the multi-threading built-in predicate threaded/1 to support
both conjunctions of goals (akin to and-parallelism) and disjunctions
of goals (akin to or-parallelism) as an argument.
Removed the experimental threaded_race/1 multi-threading built-in
predicate (its or-parallelism functionality is subsumed by the updated
threaded/1 predicate).
Corrected a bug in the implementation of the multi-threading built-in
predicate threaded_exit/1 when there is more than one thread running
the same non-deterministic goal (the fix ensures that all alternative
solutions per threaded_exit/1 call come from the same computing thread).
Thanks to Paul Crocker for the suggested bug fix solution.
Updated the sample queries in the "threads/buffer"/SCRIPT.txt" file to
match the updated entities in the example.
Updated the "threads/functions" example to use the new version of the
threaded/1 multi-threading built-in predicate.
2.30.2 - June 24, 2007
Updated the Logtalk compiler to throw a compilation error when duplicated
or conflicting predicate scope directives are found.
Updated the Logtalk compiler to correct a cosmetic glitch when reporting
compilation errors.
Updated the Logtalk compiler to check for mismatches between the argument
of this/1 calls and the parametric object identifier.
Corrected a bug in the implementation of the multi-threading built-in
predicate threaded_ignore/1.
Revamped the "threads/buffer" example to support setting the buffer
maximum number of items.
Added a new DCG example, "dcgs/morse.lgt", for parsing messages in Morse
code.
Extended the "parametric" example to illustrate a solution for dealing
with inheritance when defining "setter" predicates/methods that return
updated object identifiers.
2.30.1 - June 12, 2007
Added a new, experimental control construct, :/1, for calling imported
category predicates without using message sending mechanisms.
Added preliminary support for static binding when calling imported
category using the new :/1 control construct for categories compiled
and loaded using the compiler option "reload(skip)".
Added a new control construct, <</2, which allows proving a goal within
the context of a specified object. Useful for debugging and for writing
object unit tests.
Improved multi-threading support in order to make the built-in predicate
threaded_exit/1 generate an exception instead of blocking indefinitely
waiting for a reply from a non-existing thread.
Updated the Logtalk compiler to generate an error when compiling from a
source file new definitions for built-in entities.
Updated the Logtalk compiler to generate simpler clauses for the book-
keeping table of local predicate definitions for parametric entities.
Updated the config files for ECLiPSe, Ciao Prolog, SICStus Prolog,
SWI-Prolog, and YAP to use the renamed hook predicates introduced in
Logtalk 2.30.0 for parsing Prolog proprietary directives.
Updated the "benchmarks" example to compare the performance of calls to
imported category predicates when using a message to "self" and a direct
call.
2.30.0 - May 28, 2007
Added preliminary support for static binding when sending messages to
objects compiled and loaded using the compiler option "reload(skip)".
Allow non-instantiated arguments at compile time for the multi-threading
built-in predicate threaded/1.
Simplified and optimized the implementation of Logtalk multi-threading
support. Use a single dispatcher thread for all objects instead of each
object running its own dispatcher in order to minimize the number of
created threads (which can be problematic on 32 bits systems). Updated
the built-in predicate threaded/1 to make it deterministic and opaque to
cuts (similar to once/1).
Updated the Logtalk built-in database methods to always interpret rules
whose body is the control construct true/0 as facts. Corrected a bug when
compiling dynamic predicates that would prevent using of the clause/2
built-in database method. Corrected a bug when using the Logtalk built-in
database method clause/2 with entities compiled in debug mode. Improved
predicate lookup caching when asserting and retracting dynamic facts.
Improved detection and reporting of entity existence errors.
Added a quit option, "q", to the Logtalk built-in debugger. Modified
the debugger behavior to automatically switch to trace mode when a spy
point is found.
Added two new compiler options, "xmldir" and "tmpdir", allowing per
project definition of directories for storing XML documenting files
and for storing intermediate compilation files (e.g. Prolog files).
Removed the config file predicate '$lgt_alt_directory'/2.
Older config files are incompatible with this new Logtalk version.
Added a shortcut to the Logtalk built-in predicate logtalk_load/1, {}/1,
to all config files (defined there in order to be easy to comment it out
in case of conflict with some Prolog native feature or lack of compliance
with the ISO Prolog standard regarding the definition of the {}/1 syntax.
Allow the compiler flag "misspelt" to be set to "error".
Updated the Logtalk compiler to not try to clean-up the dynamic predicates
of redefined entities when reloading source files. Most Prolog compilers
already behave as expected when reloading the intermediate Prolog files
generated by the Logtalk compiler. For those Prolog compilers that do not
replace old definitions for dynamic predicates with the new ones, it is
not possible for Logtalk to implement a workaround that would work
correctly in all cases. Consult the "configs/NOTES.txt" file for more
information.
Corrected a bug that prevents abolishing a dynamic entity loaded from a
source file. Thanks to Victor Noel for the bug report.
Renamed the '$lgt_copy_pl_directive'/1 and '$lgt_rewrite_pl_directive'/2
config files predicates to '$lgt_rewrite_and_copy_pl_directive'/2 and
'$lgt_rewrite_and_recompile_pl_directive'/2.
Updated the config file for B-Prolog to match (and require) the new 7.0
version; updated and simplified the corresponding integration scripts.
Updated the XSB POSIX integration script to automatically detect if we
are running the XSB stable version of the XSB CVS version.
Added basic support for tabling to the config files of B-Prolog, XSB,
and YAP. Added a simple example of using tabling directives within
objects.
Updated the SWI-Prolog and YAP config files to automatically detect if
the Prolog systems have been compiled with multi-threading support and
to set the Logtalk compiler flag "threads" accordingly.
Corrected a bug when running Logtalk with SWI-Prolog that prevented the
use of alternative compilation directories (i.e. turning on the "altdirs"
compiler flag). Corrected a bug when running Logtalk with SWI-Prolog that
can prevent make/0 from recompiling and reloading modified Logtalk source
files. Updated the SWI-Prolog integration script, "swilgt.sh", to more
reliably detect the compiler executable name.
Added a "configs/swi_set_logtalk_context.pl" file defining a useful but
fragile hack implementing a set_logtalk_context/1 built-in predicate for
switching the Logtalk top-level execution context to objects other than
the default pseudo-object "user" (you may use it as a debugging tool).
Updated the CxProlog config file to use the new built-in predicates in
version 0.95. Added a shell script, "cxlgt.sh", for easy integration of
Logtalk with CxProlog on POSIX systems (with the help of Artur Miguel
Dias, CxProlog author).
Updated the Ciao, K-Prolog, and ECLiPSe config files to set the default
value for the compiler flag "underscore_vars" to "dont_care" in order to
avoid spurious warnings with some of the provided examples.
Added a config file and integration scripts for the current XSB CVS
version (3.0.1+), which supports some features needed by Logtalk not
present in the current stable version (namely, expansion of environment
variables).
Added predicates depth/2 and variant/2 to the library object "term".
Much improved "benchmarks" example, updated to allow running tests in
three different scenarios: event support on, event support off, and
using static binding. Moreover, metacalls are no longer used to run
the benchmark goals, resulting in more meaningful and accurate results.
Removed all the "make_*lgt.*" and "makeall_lgt.*" shell scripts, replaced
by pre-made integration scripts that can be found on the new "integration"
directory. Removed the "lgt_install.js" script. Renamed the POSIX install
and uninstall scripts to, respectively, "install.sh" and "uninstall.sh".
Updated the integration, uninstall, and user-setup POSIX shell scripts
to use "$prefix/share/logtalk" as the default installation directory to
better comply with the Filesystem Hierarchy Standard 2.3 for UNIX-like
operating systems.
Updated the integration scripts to automatically call the "cplgtdirs"
script when the Logtalk user directory cannot be located.
Updated the integration, documentation, uninstall, and user-setup POSIX
shell scripts to try to locate the Logtalk installation directory and the
Logtalk user directory when the environment variables LOGTALKHOME and
LOGTALKUSER are not set.
Updated the "install.sh" POSIX shell script to better clean and sanitize
the file permissions on the installation directory.
Updated the "build_release.sh" POSIX shell script to also build a Debian
binary installer package (experimental).
The Windows GUI installer no longer spans command-line shells running
JScript scripts to build the Prolog integration shortcuts. This hopefully
solves issues with security software silently blocking and breaking the
Logtalk installation.
Added basic syntax coloring support for the GNU Nano 2.x text editor.
2.29.5 - March 28, 2007
Added a new built-in predicate, "threaded/1", for proving each goal in
a conjunction in its own thread, simplifying common multi-threading
tasks that previously required sequences of calls to the built-in
predicates threaded_call/1 and threaded_exit/1.
Simplified and optimized the implementation of Logtalk multi-threading
support.
Simplified implementation of the database built-in methods. Simplified
caching of dynamic predicate lookups. Improved performance of the
built-in methods retract/1 and retractall/1.
Simplified the code generated when compiling entities in debugging mode.
Corrected a bug in the built-in debugger when processing actions at a
port that implies reading a port action again (e.g. print exception term,
print debugging status, and help options). Allow the debugger command
"skip" to work as the command "creep" in ports other than "call" and
"redo". Added a new debugger command, "ignore". Suspend debugging when
using the "break" debugger command.
Generate a compilation error instead of just printing a warning when
compiling calls to the multi-threading built-in predicates within an
object with no threaded/0 directive present.
Corrected a bug when compiling entities containing synchronization
directives on single-threaded Prolog configurations.
Improving reporting of working directory when loading or compiling source
files by expanding any environment variables occurring in the path.
Added a new compiler option, "reload", for defining the Logtalk behavior
when reloading source files. Valid values are "always" (default value;
defined in the config files) and "skip".
Updated the programming examples to use the new "reload" compiler option
when loading library entities. Simplified loading of example source files
(by updating the utility loader files to automatically load all required
library files).
Updated GNU Prolog config file to take advantage of some built-in list
predicates (requires version 1.2.14 or later); changed the compiler flag
"underscore_vars" value to "dont_care" to avoid spurious warnings with
some examples.
Added a config file for B-Prolog 7.0b1.
Updated the POSIX integration shell scripts to pass along any command
line options to the corresponding Prolog compiler and to prevent some
problems with paths containing spaces.
Much improved syntax coloring and code completion support for the jEdit
text editor.
Updated the "threads/primes" example to use the new "threaded/1" built-in
predicate. Updated the "threads/birthdays" example to better illustrate
the use of the built-in multi-threading predicates. Added a new
multi-threading example, "msort", implementing single-threaded and
multi-threaded versions of the merge sort algorithm.
Expanded the "operators" example to illustrate a simple solution for
making operators local to source files (but global to all entities
defined within the source files).
2.29.4 - February 19, 2007
Added a new library category, "listing", defining listing/0 and
listing/1 methods for helping in debugging tasks.
Added two new experimental multi-threading predicates, threaded_wait/1
and threaded_notify/1, which allows suspension of a thread's goal until
a notification is received. Added two new examples, "threads/buffer" and
"threads/blackboard", illustrating the use of these predicates.
Simplified and changed implementation of the threaded built-in
predicates in order to ensure that the threaded/0 directive is only
required on objects calling these predicates.
Only print a warning for a missing threaded/0 directive for objects.
Corrected a ordering bug on the entity initialization goal that
prevented using an object initialization goal that make use of
the object thread.
Corrected a bug when asserting rules into an object's database that
resulted in only the first asserted rule being visible when calling
the predicate through message sending. Thanks to Parker Jones for
the bug report.
Corrected a bug when compiling dynamic entities (defined in source
files using the dynamic/0 directive) where declared predicates would
be wrongly compiled as static instead of dynamic.
Updated the "make_xsblgt.sh" integration script again to fix an
additional problem resulting from the lack of support in XSB for
using environment variables in file paths.
Added minimal support for using Exuberant Ctags with Logtalk.
Added auto indent support to the jEdit text editor.
Added support for listing public predicates in the "Functions" window
of the SuperEdi text editor.
Converted TextMate code snippets from the old Property List format
to XML in order to provide compatibility with the "e" Windows text
editor.
New example: 99 bottles of beer on the wall! Sing along!
2.29.3 - January 15, 2007
Corrected a bug in the Logtalk compiler optimizer code which was
discarding some declaration and definition catchall clauses needed
by the Logtalk built-in database methods when there is no initial
declaration and definition for the referenced dynamic predicates.
Thanks to Parker Jones for the bug report.
Corrected a bug in the compilation of empty, standalone protocols
and categories.
Updated the "make_xsblgt.sh" integration script to workaround
the lack of support in XSB for using environment variables in
the argument of the reconsult/1 predicate.
Corrected a bug in the "potions.lgt" example puzzle that prevented
its solution of being found.
2.29.2 - January 10, 2007
Silently compile synchronized predicates as normal predicates on
single-threaded Prolog compilers.
When using the threaded_race/1 predicate, competing threads are
now created detached.
Corrected a bug that resulted in a loading error when reloading
source files defining threaded objects.
Corrected a bug in the implementation of the built-in predicate
threaded_peek/1 that prevented alternative solutions from being
retrieved using the built-in predicate threaded_exit/1. Removed
the built-in predicate threaded_discard/1.
The library object "random" is now a synchronized object. Updated
the "philosophers" multi-threading example accordingly.
Dropped loading of broken "cleanup" library from the YAP config file
(the call_cleanup/2 predicate, required for Logtalk multi-threading,
is now available as a built-in predicate in the YAP CVS version).
2.29.1 - December 28, 2006
Added a Logtalk version of John Fletcher's Prolog XML parser (see the
folder "contributions/xml_parser").
Added shell scripts for helping building the distribution files of a
new Logtalk release. Updated the MacOS X installer package to set
default values for the Logtalk environment variables. Corrected a bug
in the logtalk.spec file where the default value for the LOGTALKUSER
environment variable only worked for the user doing the RPM installation.
Corrected a bug in the reporting of the line number where a compilation
error (or warning) occurred. Extended support for reporting warning and
error line numbers to Quintus Prolog, Ciao Prolog, Qu-Prolog, and
ECLiPSe.
Corrected a bug when using partial lists with the predicates nth0/3-4
and nth1/3-4 provided by the "list" library object.
Improved "philosophers" multi-threading programming example.
2.29.0 - December 18, 2006
Added a new built-in, empty object named "logtalk", which can play the
role of both a class and a prototype. It may be used to define class
hierarchies without forcing the use of metaclasses or reflective
designs.
Added a built-in protocol named "monitoring" with declarations for
the before/3 and after/3 public event handler predicates. Updated
the Logtalk compiler to print a warning when defining an event handler
with no reference to the "monitoring" protocol.
The default value of the compiler flag events/1 is now off. As most
applications do not use events, this setting ensures the best possible
message processing performance for those applications.
Removed the experimental threaded_call/2 and threaded_exit/2 thread
predicates, replaced by new threaded_once/1, threaded_ignore/1,
threaded_race/1, threaded_peek/1, and threaded_discard/1 predicates.
Renamed predicate directive atomic/1 to synchronized/1. Added new
entity directive synchronized/0. Added support for new "synchronized"
and "threaded" entity properties.
Corrected a bug when using threaded calls as initialization goals
within threaded objects.
Corrected an elusive bug in the Logtalk compiler where a source file
may not be properly closed when it contains a syntax error (thanks
to Robert Shiplett for the bug report).
Corrected a bug in the implementation of the built-in methods retract/1
and retractall/1 that could result in unexpected exceptions. Updated
the built-in method assertz/1 to always use the lookup cache.
Corrected a bug in the compilation of empty classes that are not
instances of a metaclass.
Corrected a bug in the built-in method predicate_property/2 where some
predicate properties may not be returned when enumerating properties
using backtracking.
Modified the SWI-Prolog config file and integration scripts to set
the flag "iso" to "true". Corrected an elusive bug in the definition
of predicate '$lgt_directory_exists'/1 that resulted in "library not
found" errors when loading Logtalk source files from within the
SWI-Prolog initialization file (thanks to Robert Shiplett for the bug
report).
Updated the K-Prolog config file to workaround a problem when using
library notation due to failure to check directory existence with the
provided "libpaths.pl" file.
Added a RELAX NG file describing the structure of the XML documenting
files generated by Logtalk.
Corrected a bug in the Logtalk DTD file (missing "copyright" tag
declaration).
Corrected a bug in the lgt2*.js scripts where the "custom.ent" file
was not being copied when generating (X)HTML and PDF files.
Added a new multi-threading example, "philosophers", illustrating a
possible implementation of the "dining philosophers" problem.
Improved the "metapredicates" example in order to illustrate the use
of closures instead of goals as meta-arguments.
Added a reference to the "e" Windows text editor, which supports
the MacOS X TextMate 1.x text editor syntax configuration files.
Updated the manuals index pages in order to workaround browsers bugs
with parsing of empty "span" tags (e.g. Internet Explorer and Opera).
2.28.2 - November 6, 2006
Corrected a compiler bug where unknown entities will not be report when
compiling a source file whenever an entity with the same name but of a
different type is already known.
Added a XPCE hook file ("configs/xpcehook.pl") supporting Logtalk message
sending goals as XPCE call-back goals. The XPCE library is now loaded by
default by the SWI-Prolog integration scripts.
Added support for generating single PDF files of the User and Reference
Manuals. Removed the PDF versions of the individual manual XHTML pages.
The ECLiPSe config files now require release 5.10#26 or a later version.
Added support for listing Logtalk entity names (objects, categories, and
protocols) in the SubEthaEdit symbols menu.
Added a Vim dictionary file for Logtalk keyword completion and support
for automatic indentation.
Added basic support for the MacOS X Smultron text editor. Added basic
support for the Notepad++, SuperEdi, and ConTEXT Windows text editors.
2.28.1 - October 10, 2006
Added support for using XML entities using the notation "{entity name}"
in info/1 documenting directives for the "author", "copyright", and
"license" keywords. The XML entities are defined on a "custom.ent" file.
Updated Logtalk bibliographic references (in file "BIBLIOGRAPHY.bib").
Added a "lgt_uninstall.sh" shell script for uninstalling Logtalk on POSIX
operating systems.
Improved RPM install-time messages on the defined Logtalk environment
variables.
Updated the ECLiPSe integration scripts and config files to work with
and require version 5.10 (the first open source version of ECLiPSe).
Corrected a typo on the "logtalk.dtd" file that prevents validation of
XML documenting files that use a local reference to the DTD.
2.28.0 - September 28, 2006
Updated the Logtalk license to the final version of the "The Artistic
License 2.0" (see http://www.perlfoundation.org/legal/ for details).
Added experimental support for multi-threading programming on selected
Prolog compilers. Added a new object directive, threaded/0, a new
predicate directive, atomic/1, and four new built-in predicates,
threaded_call/1-2 and threaded_exit/1-2. Added a new set of examples,
"threads". Thanks to Paulo Nunes for helping developing and testing
these new features.
Expanded support for meta-predicates by allowing the declaration of meta-
arguments as closures instead of goals.
Added the generalized call/N predicate as a built-in method. This built-in
method must be used in the implementation of meta-predicates which work
with closures instead of goals.
The metapredicate/1 directive should be considered deprecated. Use the
meta_predicate/1 directive instead.
Updated the Logtalk compiler to generate an error whenever a non-variable
meta-argument is found in a clause head of a user-defined meta-predicate.
Improved compilation of meta-predicate meta-arguments. Corrected a bug
in the compilation of user meta-predicates that allowed illegal calls
to non-public predicates on the caller object to be made from the object
defining the meta-predicates. Thanks to Rémy Haemmerlé and François
Fages for reporting the problem.
Improved performance for non-cached messages, notably when running with
YAP, GNU Prolog, and SWI-Prolog on all operating systems and with SICStus
Prolog 4.0 on POSIX operating systems.
Updated the Logtalk compiler to generate an error whenever a predicate
directive appears in a source file after predicate clauses that call the
predicate specified in the directive.
Added support for "copyright" and "license" keys to the info/1 entity
documenting directive.
Improved compiler error messages to also report source file line number
for selected Prolog compilers.
Added PDF versions of all the manual XHTML pages. Added links to all the
manual XHTML pages to the corresponding PDF versions.
Corrected a bug (introduced in version 2.27.0) in the built-in predicates
abolish_object/1, abolish_protocol/1, and abolish_category/1 that resulted
in some clauses not being retracted when an object is abolished (thanks to
Neng-Fa Zhou for the bug report).
Corrected a bug (introduced in version 2.27.1) in the processing of the
term_expansion/2 predicate.
Corrected a bug in the compilation of redefined built-in predicates with
no clauses.
Added an experimental config file for CxProlog 0.93.1.
Updated the SWI-Prolog config and hook files in order to support the
edit/1 and make/0 development predicates.
Changed the Logtalk - SWI-Prolog integration scripts to load the hook
file "swihook.pl" after the other files in order to avoid some possible
errors at startup.
Updated the config file for the forthcoming SICStus Prolog 4.0 version
to work in the current beta version. Modified the "make_sicstuslgt.*"
shell scripts to work with both SICStus Prolog 3.12 and 4.0 versions.
Updated the config file for YAP to workaround a problem on the Windows
version where testing for directory existence fails if the path ends with
a slash (or a double backslash); this problem prevents the use of library
notation to load source files (problem already fixed in the current YAP
CVS version).
Updated the config file for B-Prolog to match (and require) the new 6.9
version; added integration shell scripts (for both Windows and POSIX
systems).
Updated the config files and the integration scripts for ECLiPSe in order
to workaround bugs on the predicates abolish/1 and canonical_path_name/2.
Modified the "make_eclipselgt.js" script to work with both ECLiPSe 5.8
and 5.9 versions.
Dropped support for versions of XSB older than 3.0. Added support for
smart compilation of source files to the XSB config file.
Updated the config file for IF/Prolog 5.1 by adding a missing definition
for predicate retractall/1 and avoiding some harmless singleton warnings.
Add a ".txt" extension to all "NOTES" and "SCRIPT" files.
Extended "dcgs", "parametric", and "metainterpreters" examples.
Added Inno Setup GUI Windows installer script.
Update all the JScript scripts to check if a compatible version of WSH
is installed and to workaround some problems with spaces in file paths.
Updated the "lgt_install.js" JScript script to copy the scripts/*.bat and
the xml/*.bat batch scripts to the system's Windows directory instead of
modifying the PATH environment variable.
Updated the "cplgtdirs.*" shell scripts to make a backup copy of any
previous LOGTALKUSER directory.
Added post-install scripts to the LINUX RPM "logtalk.spec" file for
setting the environment variable LOGTALKHOME for all users, defining
a default value for the environment variable LOGTALKUSER, and running
the Prolog integration scripts.
Split the installation and customization instructions in two files,
"INSTALL.txt" and "CUSTOMIZE.txt".
Added shell scripts for converting the manual XHTML pages into PDF files
using CSSToXSLFO.
2.27.1 - March 27, 2006
Allow calls to the built-in method parameter/2 with the first argument
not instantiated at compile time. Detect and report as a compilation
error parameter/2 indexes that are out of range.
Optimized generation of predicate definition and declaration linking
clauses, resulting in small lookup performance improvements and in space
savings for the Prolog code generated when compiling Logtalk entities.
Many minor code and documentation improvements to the Logtalk compiler.
Added an object version of the tokenizer described in the Michael
Covington's paper "Tokenization using DCG Rules" to the "dcgs" example.
Improved integration code for Qu-Prolog and Logtalk ("configs/qphook.ql").
Improved library hierarchy methods that return lists of objects in order
to avoid duplicated elements (library objects "proto_hierarchy.lgt" and
"class_hierarchy.lgt"). Added new methods extension/1 and extensions/1 to
the library object "proto_hierarchy.lgt".
Documented the concept of "parametric object proxy". Added a new example,
"proxies", illustrating the use of parametric object proxies.
Added support for code completion and for listing entity names on the
symbol pop-up menu to the MacOS X TextMate text editor.
Updated the "cplgtdirs.*" scripts to also create an alias/shortcut to the
"wenv" directory.
Renamed the alternative compilation and documentation directory names on
all config files to be compatible across operating-systems. Removed unused
predicate '$lgt_reverse'/2 from all config files.
Updated HTML manuals "print.css" CSS file for compatibility with the
latest version of CSSToXSLFO.
2.27.0 - February 9, 2006
Improved performance for local calls to the built-in methods phrase/2-3.
Allow the built-in methods phrase/2-3 to accept both partial and proper
lists of terminals.
Improved grammar rule translator. Report calls to undefined non-terminals
when translating grammar rules.
Added support for declaring grammar rule non-terminal aliases using the
alias/3 directive.
Added a new predicate property, non_terminal/1, for predicates resulting
from the compilation of grammar rule non-terminals.
Improved support for the built-in method expand_term/2 in order to allow
bypassing of the default Logtalk grammar rule translator by defining
clauses for the term_expansion/2 predicate. Added a "term_expansionp"
protocol to the Logtalk library. Added a new example, "expansion",
illustrating the use of the term_expansion/2 predicate.
Added a new compiler flag, hook/1, allowing the specification of a
compiler hook that is called for which term read from a source file.
Added a simple example, "hooks", of using the Logtalk compiler hook
to expand author abbreviations in info/1 directives into full names
and email addresses.
Added support for XSB 3.x to the runtime error handler. Updated the XSB
3.x config file with declarations for multi-threading meta-predicates.
Removed a few choice-points when checking validity of entity directives.
Added two new objects, list(Type) and set(Type), to the standard library
supporting the validation of lists and ordered sets whose elements are
restricted to a single type.
Added a new DCG example for solving enigmas encoded using a cellphone
keypad.
Added a missing library dependency to the "puzzles" example SCRIPT file.
Removed the experimental "systemp.lgt" protocol from the list of files
loaded by the "library/all_loader.lgt" loader utility files to avoid
compilation errors on some Prolog systems.
Corrected a bug that prevented dynamic creation of categories using the
built-in predicate create_category/4.
Corrected a bug in the reporting of singleton variables, which failed to
write an accurate message for facts and grammar rules.
Corrected a bug in passing the correct calling context ("this") when
processing meta-calls in objects.
Corrected a bug in scope checking with local calls to reflection and
database methods.
Corrected a bug in checking the validity of the arguments of the op/3
directive appearing inside entities.
Added predicates for testing if a term is a partial list or a proper list
to all config files.
Added a definition for missing open/4 ISO Prolog predicate to the config
file of Bin Prolog.
Added a workaround for a B-Prolog bug to this compiler config file.
2.26.2 - December 20, 2005
Improved error-checking for the Logtalk compiler and for the grammar rule
translator.
Small performance improvements for message sending and for the built-in
database methods.
Corrected a bug on the implementation of the built-in methods phrase/2-3
for negated grammar rule bodies (thanks to Mats Carlsson for pointing the
error).
Removed the read-only compiler flag "iso_initialization_dir".
Corrected a compilation bug on the "metapredicates" example source file.
Corrected several bugs on the performance monitor of the "searching"
example.
Switched off default generation of XML documenting files for the "symdiff"
example in order to avoid file names compatibility problems on Windows.
Updated compatibility notes on B-Prolog 6.8 and Qu-Prolog 7.0. Added a
config file for the forthcoming SICStus Prolog 4.0 version (based only
on publicly available information). Updated the config file for Amzi!
Prolog to solve issues with predicate properties and to ensure that file
system utility predicates are loaded.
Added a config file for the current XSB CVS version and the corresponding
integration shell scripts (for both Windows and POSIX systems). Modified
the "cplgtdirs.*" shell scripts in order to make either links or copies of
the config files and the "libpaths.pl" file with the required ".P" file
name extension.
Improved integration scripts documentation and help screens.
Added a predicate for checking directory existence to the config files.
2.26.1 - November 28, 2005
Added a CSS style-sheet to the Logtalk XHTML documentation that can be
used with CSSToXSLFO to generate nicely formatted PDF files suitable for
printing with running headers and page numbers.
Updated the Logtalk XHTML documentation for compliance with the XHTML 1.1
standard.
Updated the "lgtxhtml.xsl" XSLT file in order to generate XHTML 1.1 files.
Added a new, generic "lgtpdf.xsl" XSLT file. Redefined the "lgtpdfa4.xsl"
and "lgtpdfus.xsl" files to import the "lgtpdf.xsl" file.
Added support for the Lunasil XSL-FO processor to the "lgt2pdf.*" shell
scripts.
Updated the "lgt2pdf.sh", "lgt2xml.sh", and "lgt2html.sh" shell scripts
in order to write a warning message when the current directory does not
contain any XML documenting file.
Added a definition for missing open/4 ISO Prolog predicate to the config
files of Open Prolog, LPA Prolog compilers, and MasterProlog.
2.26.0 - November 7, 2005
Added support for defining predicate aliases when using uses/2 directives
(using the format Predicate::Alias).
Added Prolog modules migration code allowing modules to be compiled as
objects and allowing messages to be sent to modules. Added a new "modules"
example.
Added a "Prolog Integration and Migration Guide" to the Logtalk
documentation.
Added support for syntax coloring of common Prolog module directives to
the configuration files of the supported text editors.
Added support for using library aliases on the second argument of the
logtalk_library_path/2 predicate (using the format alias(path)).
Added support for ignoring, copying as-is, or rewriting proprietary Prolog
directives. The action to be taken is defined on a per-directive basis on
the config files.
Updated the config files of CIAO, ECLiPSe, SWI-Prolog, and YAP to define
actions for some proprietary directives in order to allow some or most of
the module libraries distributed with these compilers to be compiled as
objects.
Renamed some XML documentation-related compiler flags to more meaningful
names: "xml" -> "xmldocs", "xsl" -> "xslfile", and "doctype" -> "xmlsref".
No changes to the other flags or flag valid values.
Updated documenting scripts to use system-wide resources from LOGTALKHOME
and user-modifiable resources from LOGTALKUSER.
Updated "cplgtdirs.*" shell scripts to create links to the documenting
scripts and to the DTD and XML Schema specifications instead of making
local copies. Updated the "cplgtdirs.js" Windows JScript script to create
a link to the Logtalk manuals.
Changed generation of predicate compiled functors to add an underscore
between the original predicate functor and arity (further minimizing the
chance of name conflicts).
Improved compilation warning messages (separately handling plural and
singular forms).
Improved documentation of Windows JScript installation and integration
scripts.
Corrected a bug on the Logtalk built-in debugger on the processing of the
abort option at a leashed port (option was ignored instead of aborting the
debugging session).
Added an option to choose between a "verbose" or "compact" listing of the
default compilation flags at Logtalk startup (defined on the config files).
Improved CIAO integration scripts in order to suppress some (harmless)
warnings which are generated at first run.
Updated SWI-Prolog hook file ("swihook.pl") in order to support Logtalk
library notation when loading Logtalk files using the SWI-Prolog consult/1
predicate.
Corrected a bug on the implementation of the built-in method abolish/1
that prevented abolishing of dynamic predicates with arity zero.
Corrected a bug on the "gplgt" shell script generated by the make_gplgt.sh
shell script where the value of the LOGTALKHOME environment variable would
not be retrieved at runtime.
Removed config file for older versions of XSB (up to 2.6). Renamed the
config file for XSB 2.7.1 to simply "xsb.config".
Consolidated the source files of the "birds", "errors", "lpa", "lo",
"metainterpreters", "poem", "relations", and "symdiff" examples into
single source files. Updated the "searching" example to take advantage
of the uses/2 directive.
Removed outdated documenting shell scripts from the "xml" directory.
Corrected a bug when compiling a source file where the generated Prolog
file might not be properly closed when a compilation error occurs.
2.25.3 - September 12, 2005
Consolidated the source files of the examples "bricks", "dynpred", "mi",
"parametric", "points", "polygons", "reflection", "shapes", "sicstus",
and "viewpoints" into single source files.
Improved documentation on most example source files. Improved "parametric"
example by adding a new parametric objects and by illustrating alternative
ways of accessing object parameters.
Updated several config files with declarations for some more non-standard
Prolog meta-predicates.
Corrected some omissions and typos on the B-Prolog - Logtalk integration
instructions.
Small performance optimization for messages and super-calls with not yet
cached method lookups.
2.25.2 - August 11, 2005
Updated Logtalk installation and Prolog integration scripts in order to
detect a wrongly defined LOGTALKHOME environment variable.
Corrected a bug on the lgt_install.sh and make*lgt.sh shell scripts where
the wrong variable was being referenced when testing the existence of the
installation directory prefix.
Corrected a bug on the makeall_lgt.sh shell script that failed to properly
detect unsuccessful completion of individual Prolog integration scripts.
2.25.1 - August 8, 2005
Added support for using the "source-highlight" package (version 2.0 or
later) by Lorenzo Bettini with Logtalk source files.
Several optimizations to the syntax coloring configuration files of most
of the supported text editors. Added support for code folding to the Vim,
Kate, and TextMate text editors.
Updated the SWI-Prolog shell integration script (make_swilgt.sh) to use
either "swipl" or "pl" as the name of the Prolog executable, depending
on the host operating system.
Modified the way entity prefixes are generated for compiled code in order
to further minimize possible conflicts resulting from the same prefix being
used for different entities (bug report and fix by Brian Hulley). Changes
to the prefix format are also reflected on the names of the automatically
generated XML documenting files.
Updated the lgt2html.* and lgt2xml.* documenting scripts in order to index
parametric objects using the notation <entity>/<number of parameters>.
Corrected a bug on the lgtxml.xsl XSLT file where links to related files
pointed to .html files instead of .xml files.
Updated the lgt_install.sh and the make_*lgt.sh shell scripts to check and
report invalid installation directory prefixes.
Added a new state-space search problem, "salt3.lgt", contributed by Paula
Marisa Sampaio, to the "searching" example.
2.25.0 - May 23, 2005
Logtalk compiler is now source file-based instead of entity-based. Thus,
a source file may now contain any number of entities, without the need of
using source metafiles. Therefore, this version drops support for source
metafiles and the .mlgt file name extension.
The experimental encoding/1 directive, when used, must be the first term
on a source file. Added an entry to the reference manual describing the
directive. Improved "encodings" example.
Added a new method, debugging/1, to the "debugger" pseudo-object for
querying the system about entities compiled in debug mode.
Improved source file and entity compilation and loading reporting. In
particular, when using library notation for source files, the Logtalk
compiler now prints the library path containing the source files being
compiled or loaded.
Added new shell scripts, makeall_lgt.*, which run all the make_*lgt.*
shell scripts in sequence.
Simplified compiler reporting of singleton variables in directives and
clauses.
Added an adaption of the "timetables" LPA Prolog++ example.
Updated B-Prolog config file for the new 6.7 #2 version. Dropped support
for older versions of B-Prolog.
2.24.0 - April 22, 2005
Added experimental support for a encoding/1 directive for declaring the
text character encoding of a source file. This directive is fully based
on a directive with the same name and with similar semantics found on
recent development versions of SWI-Prolog. For now, this directive only
works with SWI-Prolog as most Prolog compilers lack support for dealing
with different text encodings. Added new flag "supports_encoding_dir".
Added a new example, "encodings", of using the new encoding/1 directive.
When a source file contains an encoding/1 directive, the XML documenting
files will use the same encoding. When no encoding/1 directive is present,
the XML documenting files will assume UTF-8 encoding.
Added new info/1 documenting directive key, "parameters", allowing the
declaration of both parameter names and parameter descriptions. Added new
info/1 documenting directive key, "remarks", allowing general remarks
about an entity to be stated. Added new info/2 documenting directive key,
"arguments", allowing declaration of both predicate argument names and
predicate argument descriptions. Added new info/2 documenting directive
key, "examples", allowing the representation of predicate call examples.
Much improved and accurate reporting of non-portable predicate calls when
using the "portability" flag.
Added a new directory to the Logtalk distribution, "contributions", which
will be used for user-contributed code. On this release, it contains an
implementation of the ISO 8601 standard by Daniel L. Dudley, providing a
library of useful date predicates.
Added new lgt2xml.* shell scripts for generating (X)HTML indexes of XML
documenting files.
Rewritten the lgtxhtml.xsl, lgthtml.xsl, lgtxml.xsl XSLT scripts in order
to make it easier to define alternative CSS files for the generated HTML
files. Rewritten the lgtpdfa4.xsl and lgtpdfus.xsl XSLT scripts in order
to improve appearance of the generated PDF files.
Improved the documentation of the "benchmarks" example and added new
predicates for running batches of benchmark tests and for generating
lists of known size for the benchmark tests of static code.
Corrected a bug in the lgt2html.*, lgt2pdf.*, and cplgtdirs.sh shell
scripts which resulted in failed transformations whenever the LOGTALKHOME
and LOGTALKUSER environment variables or the output directory contained
spaces or accented characters.
Added workaround for Prolog compilers that define operators other than
','/2 that cannot be redefined (such as new B-Prolog 6.7).
Added a Logtalk "clip" file for the TextPad Windows text editor.
Renamed directory "misc" to the more meaningful name "scripts".
Corrected a bug in the implementation of the built-in database methods
asserta/1 and assertz/1 when asserting facts on objects compiled in debug
mode.
Corrected a bug in the method leash/1 of the built-in pseudo-object
"debugger", which failed to accept an empty list as a valid argument.
Corrected a bug in the header of the automatically generated XML
documenting files when using the XML Schema specification (logtalk.xsd),
which could prevented validation when the compiler flag "doctype" is set
to "web".
Corrected a compilation bug where Prolog clauses written outside entities
on source metafiles would have their order reversed. Simplified splitting
of source metafiles.
Corrected a compilation bug where Prolog clauses written before an entity
opening directive would not be copied to the generated Prolog file.
Corrected a bug on the "roots" example in the object "class" which failed
to properly test the validity of new object identifiers.
Corrected a bug in the syntax coloring file for the Vim text editor, which
resulted in an error message when opening a Logtalk source file for the
first time.
2.23.1 - March 7, 2005
Simplified message sending compilation, improving performance of both
entity compilation and runtime top-level message sending.
Simplified implementation and improved performance of the built-in method
current_predicate/2.
Updated the runtime error handler for top-level ::/2 calls to recognize
non-existing predicate exceptions thrown by XSB, SICStus Prolog, CIAO,
B-Prolog, and recent development versions of SWI-Prolog. Rewritten the
::/2 predicate in order to minimize the overhead of the catch/3 calls
associated with the runtime error handler, thus improving performance.
Expanded the benchmarks example to test performance of the built-in
database methods.
Lookup caches are now cleaned before loading a redefined entity in order
to avoid potential problems with entity initialization goals containing
message sending calls (previous versions cleaned the caches only after
entity loading).
When reloading an object, its tables of dynamic predicate declarations
and dynamic predicate definitions are now reseted.
Corrected a compatibility problem with the "birds" example due to the use
of an operator not available in some Prolog compilers.
2.23.0 - February 21, 2005
Optimized the code generated for local calls to the built-in predicates
asserta/1, assertz/1, retract/1, and retractall/1, when the argument is
a dynamic predicate declared by a scope directive in the object making
the calls.
Added caching of predicate compiled forms for dynamic facts when used
with the database built-in methods clause/2, asserta/1, assertz/1,
retract/1, and retractall/1, resulting in a significant performance
improvement when using an object's dynamic database. Improved performance
of the database built-in methods abolish/1, asserta/1, assertz/1, clause/2,
retract/1, and retractall/1 when the cache is not used.
Corrected a bug on the implementation of the built-in methods asserta/1
and assertz/1 that prevented asserting of rules.
Corrected a bug on the implementation of built-in methods retractall/1,
retract/1, and clause/2 that allowed access to local dynamic predicates
from outside the container object.
Added a runtime error handler for top-level ::/2 calls which tries to deal
with exceptions thrown by calling non-existing predicates by translating
Logtalk generated internal predicate names to user names.
Print the total number of warnings after a call to the Logtalk built-in
predicates logtalk_compile/1-2 and logtalk_load/1-2.
2.22.5 - February 9, 2005
Added scripts for easy integration of Logtalk with K-Prolog. Updated the
K-Prolog config file, correcting a show-stopper bug and enabling support
for using the "library" notation for loading source files.
Updated JIProlog config file in order to allow smart compilation of source
files.
Changed format of preprocessor and runtime dynamic predicates that deal
with predicate indicators for better performance.
Simplified implementation of Logtalk built-in methods asserta/1 and
assertz/1.
Corrected a performance bug with calls to built-in predicates from objects
and categories.
Corrected spurious backtracking occurring on some calls to the built-in
predicate define_events/5.
Updated shell script "misc/cplgtdirs.sh" to prevent copy of Logtalk files
when the destination directory already exists (thus avoiding overriding
any user-modified files when upgrading Logtalk).
Added syntax coloring for the predicate logtalk_library_path/2 to the
supported text editors. Updated the syntax coloring file for the TextMate
text editor, adding some missing ISO Prolog predicates.
Improved printing of lists of unknown referenced entities, misspelt calls,
and singleton variables when compiling source files. Simplified handling
of references to unknown entities.
Added workaround for Prolog compilers with broken read_term/3 singletons/1
option.
Updated the Logtalk compiler/runtime and the documentation to always
use the expression "compiler flag" instead of "compiler option" for
consistency. Other minor documentation improvements.
Corrected a bug with the abolishing of dynamic entities where the clauses
corresponding to the alias/3 directive are not being abolished.
Added new predicates '$lgt_call'/9 and '$lgt_once'/9 to all config files.
Simplified and improved performance of compilation of directives containing
predicate indicators.
2.22.4 - January 12, 2005
Simplified method lookup cache tables, resulting in a small message
sending performance speedup. Improved method lookup caching for
parametric objects. Added support for caching method lookups for
parametric objects whose parameters contain cyclic terms.
Added a new category, "assignvars", to the Logtalk standard library,
containing an adaptation of the implementation of logical assignable
variables developed by Nobukuni Kino. Added a new example, "assignvars",
illustrating some possible uses of assignable variables in the context
of parametric objects.
Simplified compilation of op/3 directives: there is no longer need to
repeat the directives both before and inside an entity in order to make
the operators global and also use them in the compilation process.
Simplified installation instructions.
Corrected a compiler bug in the code that checks and prints a warning
when redefined parametric objects.
Corrected a bug in the built-in predicate abolish_category/1, which
failed to delete import relation clauses between the category being
abolished and other categories.
2.22.3 - December 30, 2004
Added a configuration file for XSB 2.7.
Corrected a bug where the use of alternative compilation directories
would fail the first time the logtalk_compile/1-2 or logtalk_load/1-2
predicates are used for a given file or library.
Corrected a bug in the built-in methods asserta/1 and assertz/1 when
asserting facts into an object being debugged, which resulted in wrong
execution context information being printed when tracing calls to
the asserted facts.
Corrected a bug in the built-in methods asserta/1 and assertz/1 when
asserting rules into an object being debugged, which resulted in rule
bodies compiled with no information being printed for the rule head
when tracing calls to the asserted rules.
Corrected a bug in the dynamic creation of objects, protocols, and
categories when the debug flag is on, which resulted in the table of
entities being debugged not being updated.
Corrected a bug in the handling of exceptions thrown when using the
built-in debugger, which resulted in exceptions always being turned
into failures.
2.22.2 - December 24, 2004
Improved performance of dynamic creation and compilation of objects,
protocols, and categories.
Improved error-checking code of methods asserta/1 and assertz/1 to
prevent asserting of non-callable terms as facts.
Improved error checking for documenting directives (info/1 and info/2).
Improved the XSB integration script (make_xsblgt.sh) in order to use the
configuration file and the libpaths file available from the $LOGTALKUSER
directory.
Improved installation instructions and installation scripts documentation.
Added documentation to the user manual on describing predicate exceptions
using the info/2 directive.
Corrected a bug in the predicate_property/2 built-in method when called
with the second argument instantiated to the alias/1 property.
2.22.1 - December 6, 2004
Improved installation instructions. Updated the Windows installation
JScript script to add the Logtalk directories "misc" and "xml" to the
system PATH environment variable and to reuse the environment variable
LOGTALKUSER if already defined.
Added helper batch scripts (misc/cplgtdirs.bat, xml/lgt2html.bat, and
xml/lgt2pdf.bat) for easily running the corresponding Windows JScript
scripts from the command-line (the two xml/lgt2*.bat scripts run the
corresponding *.js scripts stored in the %LOGTALKUSER%/xml directory
in order to support user customization).
Updated the lgt2html.* and lgt2pdf.* shell scripts to use the environment
variable LOGTALKUSER instead of LOGTALKHOME for finding supporting files,
thus allowing for end-user customization of the scripts and their related
files.
Added documentation on read-only compiler flags (which are defined in the
configuration files) to the User Manual.
Updated the misc/lgt_install.js JScript installer script to workaround a
Windows Scripting Host bug which may result in broken shortcuts in the
created "Logtalk" program group.
2.22.0 - November 29, 2004
Implemented a notion of library as simply a directory containing source
files. Added a new dynamic predicate, logtalk_library_path/2, for
specifying library paths. Added a sample file (libpaths/libpaths.pl) for
setting library paths for the Logtalk standard library and for all the
supplied examples.
Added support for using the notation <library>(<entity>) with the built-in
predicates logtalk_compile/1-2 and logtalk_load/1-2 for compiling and
loading source files contained on a library, without the need to first
change the current working directory.
Changed the library and the examples loading instructions to use the new
notation <library>(<entity>).
Improved installation instructions and installation scripts. Added a new
environment variable, LOGTALKUSER, for defining the location of the copies
of the user-modifiable Logtalk files in a multiple users setup environment.
Added utility predicates to most configuration files for querying and
changing the current working directory (needed for the <library>(<entity>)
notation to work).
Corrected a bug in the code that checks for file existence when compiling
or loading source files and source metafiles.
2.21.6 - November 15, 2004
Added support for using alternative directories for storing the Prolog files
and the XML documenting files resulting from entity compilation. A new read-
only flag, "altdirs", allows the support for alternative directories to be
turned on the configuration files of Prolog compilers providing the necessary
operating-system access predicates for implementing this feature.
Improved installation instructions and reporting of default compilation flags
at startup.
Added a sorely missing "Hello World!" example :-)
2.21.5 - November 2, 2004
Added a new optimization compiler flag, "events", which can be used to switch
off event-driven programming support when not needed, on a per-object basis,
resulting in improved message sending performance.
Small performance optimization to the runtime creation of dynamic objects,
protocols, and categories.
Updated the error handling code of the built-in predicates create_object/4,
create_protocol/3, and create_category/4 in order to throw an instantiation
error when called with a non-instantiated argument.
Updated the benchmarks example to calculate and subtract the benchmark loop
time in order to print absolute timings for the benchmarked goals.
Updated the Qu-Prolog patching instructions to also convert Logtalk source
metafiles.
Fixed a typo on the XSB compatibility notes in the configs/NOTES file.
2.21.4 - October 26, 2004
Corrected a silly bug in the definition of the predicate repeat/1 on the
new "benchmarks" example.
2.21.3 - October 25, 2004
Corrected a silly bug in message translation which resulted in a small
performance loss. Simplified implementation of message sending predicate
::/2, resulting in a small performance improvement.
Added a new section on message sending performance to the user manual.
Added a new example, "benchmarks", for helping measuring performance of
Logtalk message sending between Prolog compilers and for comparing message
sending with predicate calls in plain Prolog and with calls to modules
predicates.
Updated the YAP configuration file to hide some of the book-keeping tables
of the Logtalk runtime engine and to use statistics/2 instead of cputime/0
for more accurate timings.
Updated the Logtalk shell installation script to create the $prefix/bin
directory if it does not exist.
The lgt2pdf.sh and lgt2html.sh shell scripts now use "rm -f" when removing
the DTD and XSD files in order to avoid prompting the the user about the file
permissions.
Updated the cplgtdirs.sh shell script to make all copied files user writable.
2.21.2 - October 18, 2004
Added support for declaring grammar rule non-terminals as public, protected,
private, dynamic, or discontiguous using the notation Functor//Arity. Added
support for documenting non-terminals using the info/2 and mode/2 directives.
Added support for a new alias/1 predicate property.
New experimental config file for JIProlog 3.0 (see the configs/NOTES file
for details).
Added a mode bundle for the TextMode 1.0.x (MacOS X) text editor providing
syntax highlighting, folding, and code snippets for editing Logtalk source
files. Corrected a bug in the syntax coloring of the :-/1-2 operator on the
SubEthaEdit 2.x text editor.
2.21.1 - September 27, 2004
Added experimental support for a new built-in method, expand_term/2, which
allows access to the Logtalk grammar rule translator. Corrected bug in the
expansion of \+/1 in grammar rule bodies. Optimized code generated for
message sending calls in the body of grammar rules. Improved error handling
of the built-in methods phrase/2 and phrase/3. Added new section on definite
clause grammars to the user manual. Added two new objects to the "dcgs"
example, dcgtest and bypass, containing test cases for the Logtalk DCG
translator and illustrating some programming techniques with grammar rules.
Corrected a bug in the implementation of the built-in method clause/2 which
prevented access to clauses of local dynamic predicates.
Corrected some dead links on the XHTML manuals.
Corrected a bug in the syntax coloring of numbers on the SubEthaEdit 2.x
text editor.
2.21.0 - September 14, 2004
Added a new predicate directive, alias/3, which allows the definition of
alternative predicate names in order to improve readability of inherited
features and to solve conflicts between implemented, imported, or inherited
predicates.
Added new example, "aliases", illustrating the use of the new alias/3
predicate directive for improving readability of inherited features.
Added new example, "diamonds", illustrating problems and solutions for the
"diamond problem" (multi-inheritance conflicts and ambiguities) using the
new alias/3 predicate directive.
Allow categories to import other categories, i.e. allow categories to be
defined as a composition of other categories. This feature should only be
used when extending a category without breaking its functional cohesion
(for example, when a modified version of a category is needed for importing
into several unrelated objects).
Added new example, "engines", illustrating importing a category from another
category.
Updated the syntax coloring configuration files for the supported text
editors for the new alias/3 predicate directive.
Added auto-complete strings for Logtalk methods and for Logtalk and Prolog
built-in predicates and directives to the SubEthaEdit 2.x text editor.
Corrected a bug which prevented compilation of metafiles containing
parametric entities.
2.20.2 - August 31, 2004
Added a Windows JScript script for installing Logtalk. Improved the Windows
JScript scripts used for easy integration of Logtalk with selected Prolog
compilers.
Improved user manual section on defining object and category metapredicates
and on calling non-standard Prolog built-in metapredicates. Improved the
description of some compiler options.
Added some files missing from the "errors" example (which should have been
included in the previous release).
Added basic syntax coloring support for the BBEdit 8.x text editor.
2.20.1 - August 19, 2004
Added Windows JScript scripts for easy integration of Logtalk with CIAO and
GNU Prolog.
Added encoding attribute (set to UTF-8) to the xsl:output tag in the
lgtxml.xsl, lgthtml.xsl, and lgtxhtml.xsl files.
Replaced the Windows JScript scripts lgt2pdf.js and lgt2html.js by their
final versions (the wrong ones shipped with Logtalk version 2.20.0).
Updated the "errors" example to illustrate possible conflict errors when
using the uses/2 directive.
Updated the RPM logtalk.spec file to use the .tgz archive extension.
2.20.0 - August 16, 2004
Added support for the uses/2 predicate directive (whose semantics is similar
to C++ using-declarations). Updated the uses/1 entity directive to accept as
argument a single object identifier.
Improved installation instructions for Windows users.
Added four new sample bash shell scripts and Windows JScript scripts for
converting XML documenting files to PDF, HTML, and XHTML using several XSL
processors.
Added missing namespace to XSL files in order to generated valid (X)HTML
files with recent versions of XSLT processors.
Updated the User Manual documentation on converting XML documenting files
to other formats.
Removed the texml.xsl XSLT file as the TeXMLatte application it depends on
is no longer available.
Added Windows JScript script for copying the Logtalk examples, library, and
xml directories to the user directory.
Added Windows JScript scripts for easy integration of Logtalk with ECLiPSe,
SWI-Prolog, SICStus Prolog, and YAP.
Added missing extension for source metafiles to the SWI-Prolog hook file.
Corrected a bug in the lgtxhtml.xsl XSLT file where a wrong reference to
the Logtalk CSS file is being used in the xml-stylesheet tag.
The iso_initialization_dir/1 compiler option is now a read only flag,
defined in the configuration files.
2.19.1 - August 2, 2004
Corrected a bug where entities could not be reloaded if they depend on
other, not yet loaded entities.
Corrected a bug where compiler options would not be used when compiling
source metafiles.
Corrected several typos on the Logtalk manuals.
2.19.0 - July 26, 2004
Added support for defining more that one entity per file using Logtalk
source metafiles (*.mlgt), which the runtime engine automatically splits
on single entity source files plus loading and compiling helper files.
Updated URL used on the automatically generated XML documenting files
when compiling entities with the option doctype(web).
Improved error checking when compiling calls to the {}/1 control construct.
Corrected several typos and some outdated links on the Logtalk manuals.
2.18.0 - July 9, 2004
Added caching of method lookups in order to improve message processing
performance (including messages to self and super calls). Applied several
optimizations to runtime translation of messages in order to further
improve performance.
Improved error checking while parsing and compiling messages to self.
Update ECLiPSe config files to compile the Prolog files generated by Logtalk
(when compiling source files) in optimized mode instead of traceable mode.
Updated description of patches needed for running Logtalk with XSB, added
a shell script for easy integration of Logtalk with this Prolog compiler,
and corrected a problem with its corresponding config file.
Added multifile/1 directive to the syntax coloring configuration files of the
supported text editors.
2.17.2 - June 14, 2004
Updated the Logtalk compiler to allow compilation of source files which
contain only directives and no entity definition.
Simplified loading of library and example entities by using Logtalk source
files as loader files.
Some improvements to the documentation, including the QUICK_START file and
the User Manual for first-time users, and to the example descriptions.
Corrected a bug in handling of local object operators that are also global
operators.
Corrected a bug where dynamic directives are not being generated for dynamic
predicates that lack a scope directive or an initial set of clauses.
Corrected a bug where local dynamic predicates would need a private scope
directive in order to allow clauses of the predicate to be retracted.
Simplified compilation of dynamic and discontiguous predicate directives.
Added new "logic" example implementing a translator from logic propositions
to conjunctive normal form.
Corrected a problem with wrong end-on-lines on some files.
Added a shell script for easy integration of Logtalk with CIAO Prolog.
2.17.1 - June 7, 2004
Added custom handling of specification of predicate exceptions in info/2
documenting directives when writing XML documenting files (declared as
"exceptions is [Cond1-Term1, Cond2-Term2, ...]"; each pair (Condi, Termi)
represents an error condition and its respective exception).
Changed debugger command "e" to print exception terms instead of exiting
Logtalk session.
Corrected a compilation error with B-Prolog due to operator priorities.
Corrected a possible problem with the redefinition of loaded entities that
define (possibly at runtime) dynamic predicates. All clauses for an entity
dynamic predicates are retracted before loading the new entity definition.
Corrected a potential bug when pretty printing terms with variables in the
debugger and in the created XML documenting files.
Added four more DCGs examples ("walker movements", "iterative shell command
parsing", "bill of materials", and "command language").
New "puzzles" and "metainterpreters" examples.
Added a mode bundle for the SubEthaEdit 2.x (MacOS X) text editor providing
syntax coloring for editing Logtalk source files. Optimized some of the
regular expressions in the syntax coloring files for the Kate/Kwrite and Vim
text editors.
Removed predicate nth/3 from library entities listp, list, and difflist.
Replaced by the predicates nth0/3 and nth1/3. Added new predicates nth1/4
and nth0/4.
Updated the config file for Quintus Prolog to make use of the "files"
library.
Added experimental implementations for some Prolog compilers of the library
portable protocol for operating system access (systemp.lgt). See the file
library/experimental/NOTES for details.
2.17.0 - April 26, 2004
Added built-in debugging support implemented through the definition of a
new pseudo-object named "debugger". Added "debug" compiler option. Renamed
library entities "debuggerp" and "debugger" to, respectively, "event_dbgp"
and "event_dbg".
Improved installation instructions for multi-user environments. Added
a shell script for installing Logtalk in Unix and Unix-like operating
systems. Added a shell script for copying Logtalk xml, examples, and
library directories to the user home directory.
Added a logtalk.spec file for building Linux RPMs from sources.
Added a set of shell scripts for easy integration of Logtalk with ECLiPSe,
GNU Prolog, Qu-Prolog, SICStus Prolog, SWI-Prolog, and YAP.
Corrected bug in the definition of the pseudo-object "user" that resulted
in mixed up metapredicate and type predicate properties.
Removed config files for outdated versions of Qu-Prolog, SWI-Prolog, ECLiPSe,
K-Prolog, CIAO, YAP, Amzi! Prolog, LPA Win-Prolog, SICStus Prolog, and XSB.
2.16.2 - April 2, 2004
Corrected a bug in the library category monitor (file library/monitor.lgt)
that prevents its compilation.
Changed the possible values of the read-only flag startup_message (defined
in the config files) to "flags" (print banner and flag values), "banner"
(print only the banner), and "none" (do not print neither the banner or the
flag values). Default value is "flags".
Updated the "errors" example to illustrate the error messages thrown when
trying to redefine Logtalk built-in control constructs.
Corrected a small problem with the Logtalk language specification file for
Apple's Xcode IDE.
Added preliminary support for syntax coloring using the Windows text editor
Crimson Editor.
2.16.1 - March 23, 2004
The local built-in method parameter/2 can now be used inside categories
(but please read the warnings about such practice on the user manual).
Updated the Logtalk compiler to report an error when the user tries to
redefine a message sending or external call control construct inside an
object or category.
Corrected a bug in the compilation of metacalls whose meta-arguments are
variables.
Removed references to file sax.jar from the scripts used to convert XML
documenting files into (X)HTML. Updated scripts html.sh, htmlnt.cmd, and
htmldos.bat to use XT 20020426a or later version.
Improved syntax coloring accuracy of built-in predicates and methods for
the SubEthaEdit text editor.
Updated config file for Qu-Prolog 6.4.
2.16.0 - March 3, 2004
Logtalk is now distributed under the Artistic License 2.0.
Operators declared inside an entity are now local to the entity, not
affecting the global operator table (complying with the Logtalk language
specification). Input and output of terms from inside objects and
categories now work as expected in the presence of local operator
declarations. Added a new example named "operators".
Updated built-in method predicate_property/2 for returning metapredicate/1
properties for both Logtalk and Prolog metapredicates.
Added support for calls to non-ISO Prolog standard built-in metapredicates
inside objects and categories. Added support for the declaration of non-ISO
Prolog standard metapredicates in the config files.
Small change to the way the Logtalk compiler reports the compilation of
entities. Small optimizations to the compilation of Logtalk source files.
Corrected a bug where calls to Logtalk built-in predicates would be
reported as non-portable when the value of compiler option portability is
set to warning.
New config file for Qu-Prolog 6.4 (see the configs/NOTES file for details).
Corrected a problem with the syntax coloring of quoted atoms and strings
in the SubEthaEdit text editor. Added more accurate syntax highlight for
built-in methods and built-in predicates.
Updated the syntax coloring configuration files for all supported text
editors to recognize the file extension used by the config files.
2.15.6 - February 9, 2004
Added "xmlspec" compiler option in order to specify the extension (dtd
or xsd) of the file describing the XML documenting files specification.
Renamed compiler option "named_anonymous_vars" to the more appropriated
name "underscore_vars". Changed possible option values to "dont_care" and
"singletons" (default).
Added XSLT file for converting XML documenting files to XHTML 1.0 Strict
files. Set the default encoding of all XSLT files to UTF-8.
Added syntax coloring support for the KDE Kate and Kwrite text editors.
Improved syntax coloring configuration files for VIM, jEdit, NEdit,
SubEthaEdit, and Emacs text editors.
Removed outdated support for MacOS X Project Builder and added support
for the new MacOS X Xcode developer tool.
Corrected bug in the built-in predicate current_logtalk_flag/2 that
prevented some flag values from being returned after using the built-in
predicate set_logtalk_flag/2.
Corrected bug in the shapes example (wrong placement of the declaration
of the predicate side/1).
2.15.5 - December 30, 2003
Make operator ^^/1 right-associative for consistency with remaining
operator declarations.
Added file BIBLIOGRAPHY containing a list of Logtalk publications in
BibTeX format.
Added a font-lock file for Emacs providing syntax coloring for editing
Logtalk source files.
Added an implementation of the Smalltalk dependent mechanism to the
standard Logtalk library.
Updated the config file for ECLiPSe 5.4~5.7 with missing ISO Prolog
predicate definitions needed for successful compilation of all entities
in the Logtalk standard library.
Updated manual pages to comply with XHTML 1.0 Strict and to provide
better navigation.
2.15.4 - July 9, 2003
Corrected a spurious backtracking bug in the DCG rule translator. Added
two more examples of DCGs.
New config file for XSB 2.6. Updated Logtalk compiler to compile cleanly
under XSB after applying the patch described in configs/NOTES.
Updated SWI-Prolog config file to hide compiled entity predicates (requires
SWI-Prolog 5.2.3 or later version). New optional file configs/swihook.pl
contains hook code that allows Logtalk entities to be compiled and loaded
using SWI-Prolog load_files/2 and consult/1 predicates.
Syntax definition file for the Hydra 1.1 (MacOS X) text editor providing
syntax coloring for editing Logtalk source files.
Updated syntax coloring files for jEdit, NEdit, Vim, and TextPad in order
to recognize character code constants (0'x) and the DCG operator -->/2.
2.15.3 - June 27, 2003
Updated experimental support for DCG rules to prevent over-simplification
of unification goals in the compilation of rules to clauses. Push-back
lists can now be used on rule heads.
The compilation mode of an entity (static/dynamic) is now stored in the
corresponding entity table (implying recompilation of all entities).
Updated GNU Prolog config file to hide compiled entity predicates.
Updated SWI-Prolog config file for better integration of Logtalk with
this compiler.
2.15.2 - April 2, 2003
Experimental support for DCG rules inside categories and objects. Added
built-in methods phrase/2 and phrase/3.
Updated GNU Prolog config file to not hide compiled entity predicates in
order to avoid incompatibilities with dynamic entities.
2.15.1 - March 8, 2003
New example, msglog, of using events and monitors to record, replay, and
print user messages.
Corrected a typo on the jEdit templates that resulted in syntax errors.
Corrected wrong year format in info/1 directive in all entity templates.
Added missing version info key to jEdit prototype template.
Corrected documentation of built-in local methods self/1 and sender/1.
Updated documentation of built-in local methods parameter/2 and this/1.
2.15.0 - February 3, 2003
Changed "authors" key in info/1 directive to "author".
Corrected documentation of built-in local method this/1.
New geometric shapes example implemented in two versions, one
prototype-based and the other one class-based.
Improved support for jEdit text editor by adding a set of programming
templates for use with the editor Templates plug-in.
Added basic support for syntax highlighting and programming templates
for MacOS X Project builder.
2.14.7 - January 10, 2003
Corrected a bug in the built-in methods asserta/1 and assertz/1 when
asserting predicate rules.
The built-in predicates logtalk_compile/1-2 and logtalk_load/1-2 now
accept both an entity (an atom) or a list of entities (a list of atoms).
Optimized the code generated when compiling or asserting clauses for
dynamic predicates.
Optimized protected inheritance performance on some Prolog compilers.
2.14.6 - December 31, 2002
Corrected a bug where the opening directive of an object that,
simultaneously, implements a protocol, imports a category, instantiates
a class, and specializes a superclass, will not be recognized.
2.14.5 - December 20, 2002
Simplified dynamic table of predicate declarations by removing two
redundant arguments.
Corrected a bug where sending messages such as true/0 or !/0 to an
unknown object succeeded instead of throwing the correct exception.
Simplified the code used to generate links in the lgtpdfa4.xsl and
lgtpdfus.xsl XSLT files.
2.14.4 - November 5, 2002
Removed definition of deprecated built-in predicate logtalk_version/3.
Show flag names when printing at startup the default flag values.
Small change to messages printed on console with smart compilation of
source files turned on.
Updated YAP 4.3.x config file to use the YAP "system" library to access
the operating system for time, date, and file properties (enabling smart
source code compilation).
Updated the lgtpdfa4.xsl and lgtpdfus.xsl XSLT files to workaround a bug
in the PassiveTeX 1.21 XSL:FO processor.
2.14.3 - September 16, 2002
New compiler option, doctype, to set the doctype reference (if any)
in the XML documenting files. Default value is "local" for backward
compatibility. Updated the user manual section on compiler options.
The Logtalk built-in predicate logtalk_version/3 should be considered
deprecated (use current_logtalk_flag/3 instead). All references to this
predicate have been removed from the manuals.
Updated the jEdit syntax coloring config file for the new jEdit 4.1
version.
Updated the lgtpdfa4.xsl and lgtpdfus.xsl XSLT files for compatibility
with the XSL:FO processors Apache FOP 0.20.4, PassiveTeX, and RenderX
and with the XSL W3C Recommendation of October 15, 2001. Updated the
pdf.bat and pdf.sh scripts to reference the latest version of the
Apache FOP processor (0.20.4).
Changed the shell scripts html.sh and pdf.sh for compatibility with the
sh, bash, and zsh shells.
2.14.2 - August 26, 2002
Calls to built-in method parameter/2 are now compiled inline, improving
call performance.
Updated Logtalk compiler to clean temporary compilation predicates after
compiling an entity instead of only before compilation.
Updated YAP 4.3.x config file for better Logtalk integration by hiding
all internal compiler, runtime, and compiled entities static predicates.
Updated GNU Prolog config file for better Logtalk integration by hiding
all internal compiler, runtime, and compiled entities predicates.
Updated the XSLT conversion scripts lgtxml.xsl and lgthtml.xsl to correct
some HTML conformance errors in the generated pages.
Corrected some XHTML conformance errors in the manual pages.
2.14.1 - July 31, 2002
New Windows NT script and updated Unix shell script for batch converting
XML documenting files to HTML. Both scripts also generate an index.html
file containing links to all converted XML documenting files.
Corrected wrong XHTML DOCTYPE declaration in manual pages.
2.14.0 - July 26, 2002
Renamed all compiler and runtime internal predicates and all auxiliary
predicates in the config files to start with a "$" character.
New compiler option, code_prefix, to set a prefix for all Prolog code
functors generated by Logtalk when compiling entities. Default is ''.
New compiler option, named_anonymous_vars, that instructs the compiler to
interpret variables that start with an underscore as anonymous variables
(and to not report them as singleton variables). Default value is "off".
Directive info/2 was wrongly declared as a entity directive instead of a
predicate directive.
Converted all manual pages to XHTML 1.0 format. Corrected a wrong link in
the reference manual. Replaced GIF images by PNG versions.
Updated BProlog 6.x config file to workaround the new 6.2 built-in
predicate ::/2 that conflicts with the same named Logtalk message sending
operator.
Removed call to the obsolete built-in predicate nodbgcomp/0 from all
ECLiPSe config files.
2.13.0 - June 15, 2002
Logtalk now outputs Prolog code using write_canonical/2 instead of
write_term/3. Goals are better portability of the generated Prolog files
and avoid issues with clauses with long bodies for Prolog compilers that
use a term print depth limit to prevent problems with cyclic terms.
Added report of default flag values at Logtalk startup.
Logtalk now prints a warning when redefining parametric objects.
Removed need of an abort/0 predicate from the Logtalk debugger example.
Removed any definition of this predicate from the config files.
Added missing definitions for some ISO built-in predicates to the Amzi!
Prolog 6.2.2 config file.
2.12.0 - May 25, 2002
New read-only Logtalk flag "version". Corrected exception term generated
when trying to modify a read-only flag using the set_logtalk_flag/2
built-in predicate.
Updated config file for OpenProlog 1.1b5.
New config file for ECLiPSe 5.4.
Renamed config files for CIAO 1.7 (beta of 1.8) to "ciao_aux18.config"
and "ciao18.config".
Updated config file for Amzi! Prolog 6.2.2.
New example of using some of the built-in database handling methods
(dynpred).
Syntax configuration files for jEdit 4.0, VIM 6.1, NEdit 5.2, and
TextPad 4.5 text editors providing syntax highlighting for editing
Logtalk source files.
2.11.0 - April 24, 2002
Added a "smart compilation" feature to the Logtalk compiler, controlled
by a "smart_compilation" flag. Only available in Prolog compilers that
provide access to file modification dates.
Added a "startup_message" flag to control printing of the Logtalk banner
at startup.
Reworked Logtalk pre-processor compilation and loading reports. Compiler
option "report" now toggles between normal reporting (as specified by the
other flags) and silent compilation/loading of source files.
2.10.0 - April 5, 2002
Scope of object asserted predicates for which there is no declaration is
now a function of the context instead of always being declared public.
Asserting in this, the predicate is declared private, asserting in self,
the predicate is declared protected, otherwise the predicate is declared
public.
Throw an error if a category contains clauses for dynamic predicates.
Updated documentation on categories and built-in methods for database
handling.
Retracting all clauses for a dynamic predicate from an object now allows
an inherited definition to be called when sending the corresponding
message. In previous versions the message just failed.
Added missing entries for the built-in predicates current_logtalk_flag/2
and set_logtalk_flag/2 to the Logtalk compiler built-in predicates table.
Updated config file for Amzi! Prolog 6.1.74.
Updated notes on patching XSB to work with Logtalk.
2.9.3 - February 9, 2002
New current_logtalk_flag/2 and set_logtalk_flag/2 built-in predicates.
Updated documentation on new built-in predicates.
Renamed SWI-Prolog config file swi330.config to swi.config.
Renamed config file predicate lgt_default_compiler_option/2 to lgt_flag/2.
New XSL style-sheets and shell scripts to convert Logtalk XML entity
documenting files to PDF format using XSL Formating Objects.
2.9.2 - January 4, 2002
The Logtalk compiler can now print a warning when compiling source files
that use non-ISO defined built-in predicates using a new portability/1
compiler option. Updated the relevant sections of the user manual and the
errors example.
Corrected a compiler bug where the entity relation tables only recorded
the last entry per entity relation type.
Updated config file for CIAO 1.7#162.
2.9.1 - December 5, 2001
Logtalk compiler now prints a warning when redefining or replacing an
existing entity.
Corrected a compiler bug in the error checking code for the info/1
and info/2 directives.
Changed the order of object loading in the "mi" example to avoid
spurious warning messages.
Added a new problem ("bridge") to the "searching" example. Improved
"performance" monitor to give correct reports on alternative solutions.
Corrected a bug in the "water jug" state space example.
2.9.0 - October 22, 2001
Added config files for CIAO Prolog 1.7p115 and B-Prolog 6.0.
Compiling and loading an entity that contains references to unknown
entities (by default) prints a warning. Updated user and reference
manuals.
Rewritten all the compiler warning/error code and output messages.
Changed compiled code functors postfixes from "_sdcl" and "_sdef" to
"_idcl" and "_idef" (implies recompilation of all objects, protocols,
and categories).
Changed all occurrences and references to the term "entity_scope" to
"scope".
Removed some redundant productions from the Logtalk grammar.
Updated documentation on the xml directory. Renamed some of the .xsl
files. Added sample scripts to batch convert .xml files to .html files.
Added a new loader utility file, all.loader, to load all library files
loaded by the other loader files.
Started work on documenting the Logtalk pre-processor/compiler source
file.
New "errors" example. Updated the "inheritance" example.
2.8.4 - March 9, 2001
Updated config files for BinProlog 8.0, K-Prolog 5.01, XSB 2.3, and
Amzi! Prolog 4.103~5.0.
New config file for Amzi! Prolog 6.1 beta.
Corrected an incomplete entity definition in the Logtalk XML DTD.
Rewrite the Logtalk XSLT files for improved compatibility with XSLT
processors regarding handling of whitespace.
A first cut of a XML Schema for the Logtalk XML documentation files
(file xml/logtalk.xsd).
Small improvements to the documentation.
2.8.3 - November 21, 2000
Corrected a bug where sending a message for a built-in method to an
unknown object fails instead of generating the expected exception.
Put some occurrences of atoms public, mode, and type between ()'s to
avoid compilation errors in BinProlog 8.0 and other Prolog compilers
that declare these atoms as operators.
Corrected the definition of the state space of the "Missionaries and
Cannibals" problem in the "searching" example that resulted in some
wrong solutions.
2.8.2 - November 5, 2000
New .xsl file to convert .xml files to TeXML files.
Fixed a problem with explicit compilation options being correctly parsed
but not processed.
Corrected a bug regarding default init options definition for the
points, polygons, and bricks examples. Updated category initialization
in roots example.
2.8.1 - October 28, 2000
New config file for K-Prolog 5.0.
Improved compiler error detection and reporting of invalid directives
and clauses.
Corrected a problem with some Prolog compilers where compiling a file
containing syntax errors may not close the file after the errors are
reported.
Many small improvements to all documentation.
Small improvements to the .xsl files and to the output of .xml files.
2.8.0 - October 1, 2000
I have found just a few days ago that I have uploaded to the Logtalk web
server a development version of Logtalk 2.7.0 instead of the final one!
To avoid confusions I decided to release a new version.
Changed implementation of the logtalk_compile/1-2 and logtalk_load/1-2
predicates to only accept a list of entities instead of either an entity
or a list of entities, simplifying and improving the performance of these
predicates. Improved error reporting for the logtalk_compile/1 and
logtalk_load/1 predicates. Updated relevant sessions in the user and
reference manuals.
Simplified the implementation of the following predicates, by sharing
the error checking code with the corresponding extended versions:
implements_protocol/2, imports_category/2, instantiates_class/2,
specializes_class/2, extends_protocol/2, and extends_object/2.
Completed some missing library file dependencies documentation in some
examples.
New version of the QUICK_START help file. Updated tutorial.
2.7.0 - August 24, 2000
First release of the Logtalk standard library of objects, protocols and
categories.
Rewritten all examples to use the new Logtalk standard library.
New logtalk_load/2 and logtalk_compile/2 Logtalk built-in predicates,
accepting a list of compiler options. See the User and Reference Manuals
for details.
New XSLT file for viewing .xml files in Microsoft Internet Explorer 5.5
for Windows after installing the latest Microsoft XML Parser Preview
Release. Small improvements in all XSLT files.
Starting with this version all config files need to provide a definition
for the compare/3 predicate if it is not built-in in the corresponding
Prolog compiler. Also, default Logtalk compiler options are now also set
in the config files using the lgt_default_compiler_option/2 predicate.
Updated config file for CIAO 1.6p1. See the configs/NOTES file for
details.
2.6.2 - July 4, 2000
Improved performance and error checking for the built-in predicates
create_object/4, create_protocol/3 and create_category/4.
Updated config file for BinProlog 7.83.
Many small updates to all documentation.
New PDF versions of the documentation formated for printing (with page
numbers, table of contents and index)are now available in both A4 and
US letter formats.
2.6.1 - May 5, 2000
Modified the structure of the automatically generated XML documenting
files to improve XSL translation performance. Added a new, more standard
compliant, XSL file to generate HTML files and renamed the old one to
ie5.xsl. See the xml/NOTES file for details. Corrected an error in the
logtalk.css CSS file.
Modified the definitions of predicates lgt_file_extension/2 and
lgt_file_name/2 in all config files.
Updated all the user manual sessions related to automatic documentation.
Updated all HTML documentation for future XHTML 1.0 conformance.
Start adding documenting directives to most examples.
2.6.0 - April 27, 2000
Added support for documentation of objects, protocols, and
categories, using automatic generation of XML files.
Added info/1 and info/2 directives for documenting objects, protocols,
categories, and predicates. Added definition of documentation file name
extension and default file names for the DTD and XSL files to the config
files.
Improved error checking for the built-in predicates create_object/4,
create_protocol/3 and create_category/4 to also detect invalid entity
identifiers.
Updated the user and reference manuals to describe the new automatic
documenting features.
Updated all HTML documentation to conform to HTML 4.01 strict standard.
Corrected some wrong cross-reference links and titles in the reference
and user manuals HTML pages.
PDF versions of the manuals and tutorial are now available in both A4
and US letter formats.
Corrected two errors in the searching example, one in the definition of
the farmer problem state space and the other when backtracking over
performance reports.
2.5.2 - March 7, 2000
Updated manuals to clarify some limitations of declaring and defining
dynamic predicates inside categories and documented a way of using the
built-in local method this/1 to access object parameters.
Removed references to parametric categories from the Logtalk
documentation (at runtime we can only access object parameters,
not category parameters).
Corrected two wrong declarations of built-in methods (forall/2 and
retractall/1) in the Logtalk pre-processor.
Corrected bug where predicates declared in dynamic entities may have
a "static" instead of a "dynamic" property.
Corrected a bug in category compilation that prevented a dynamic category
from being abolished. Speedup predicate definition lookups for categories.
2.5.1 - February 18, 2000
Two new examples: birds, a bird identification expert system adopted
(with permission) from an Amzi example, and viewpoints, a set of
prototypes showing how to do property sharing and value sharing in
Logtalk.
Renamed config file yap421.config to yap430.config to match the name of
the new YAP 4.3.0 public release (named 4.2.1 while on beta testing).
on beta testing).
Partial config file for Trinc Prolog R3.
2.5.0 - December 29, 1999
The Logtalk pre-processor now accepts arbitrary clauses and directives
to appear in a file before an opening entity directive. The clauses and
directives are added unchanged to the compiled file.
Improved performance for all kinds of message sending.
Two new examples: reflection, showing how to implement a simple
class-based reflective system, and symdiff, showing how to use
parametric objects to implement symbolic expression differentiation
and simplification.
Updated config file for the beta 8 release of SWI-Prolog 3.3.0.
2.4.0 - December 1, 1999
Logtalk is now an Open Source project, available under Perl's Artistic
license.
Two new examples: instmethods, illustrating the use of instance defined
methods and classvars, showing how to implement class variables.
Updated Logtalk grammar to explicitly allow for user-defined types
in mode/2 directives.
New config files for SWI-Prolog 3.3.0, SICStus Prolog 3.8 and CIAO
Prolog 1.4p0 (incomplete).
Updated config file for B-Prolog 4.0.
Updated config file for GNU Prolog to use the new call_with_args()
built-in predicate added in version 1.1.0.
Updated config file for YAP Prolog to use the new call_with_args()
built-in predicate added in version 4.2.1.
2.3.1 - September 22, 1999
Logtalk pre-processor updated to only report one warning per redefined
Logtalk or Prolog built-in predicate.
Changed some occurrences of atom "public" to "(public)" in
compiler/logtalk.pl file to avoid syntax errors in Prolog compilers
(like BinProlog) that define "public" as an operator. Also put some
terms between ()'s to avoid syntax errors with ALS Prolog 3.1
Update config file for ALS Prolog to work with version 3.1.
Updated configs/NOTES file include a workaround to use Logtalk with
XSB 2.0, some guidelines on how to write loader utility files for
BinProlog 7.50, and a bug in ALS Prolog 3.1 that affects Logtalk.
2.3.0 - September 12, 1999
Metapredicate information is now stored with the other predicate
properties, instead of being discarded after compiling the clauses of
a metapredicate. Added predicate property metapredicate/1. It is now
possible to assert clauses for dynamic metapredicates.
Corrected a bug in the processing of metacalls in pseudo-object user.
Corrected a bug in the implementation of private inheritance.
Improved performance of protected inheritance.
Corrected failure of processing initialization/1 and op/3 directives in
create_object/4, create_category/4 and create_protocol/3 built-in
predicates.
Corrected a bug when calling private static category predicates from
importing objects. Simplified code generated for categories.
Rewrite code for the built-in method current_predicate/1 to avoid
duplicated or wrong results when overriding predicate declarations
and to ensure that all possible argument type errors are detected.
Changed compilation of classes that do not instantiate any (meta)class
in order to throw the correct exception when a message is sent to them.
Changed compilation of root objects (that do not instantiate, specialize
or extend other objects) so that calls to "super" (^^/1) fail (as they
should) instead of generating a "predicate does not exist" error message.
Changed implementation of "super" calls (^^/1) to avoid a potential
endless loop problem when using these calls from the inheritance root
object of a reflexive class-based systems.
Pre-processor now checks for callable and object identifier errors.
Runtime now checks for non-instantiated messages.
Added new example (inheritance) about public, protected and private
inheritance.
Updated metapredicates, lo, kernel, and types examples. Most of the
code in the last two examples is being updated to form the basis of an
upcoming Logtalk standard library.
Small changes in the pre-processor/runtime code for compatibility with
ECLiPSe 4.2.2. Updated config files for this Prolog compiler.
Rewrite some predicates in the config files for SWI-Prolog and LPA
Mac and WIN Prologs for improved performance.
New tutorial session about events and monitors.
Updated documentation to match the changes made in this version.
2.2.0 - July 10, 1999
Implemented public, protected and private object inheritance, protocol
implementation and category importation.
New Logtalk built-in predicates instantiates_class/3, extends_object/3,
extends_protocol/3, specializes_class/3, imports_category/3 and
implements_protocol/3. The third argument returns the relation scope.
Pre-processor now checks most directive errors.
Changed ^^/1 (super call) implementation to only allow the use of a
single predicate call for argument and to retain the original sender
of the message (see the updated sicstus example).
Fixed bug that prevented directives with a variable number of arguments
(like dynamic(), public(), uses(), ...) being recognized.
Changed definition of predicate read_term/3 in the configs files of Amzi!,
Aquarius, Arity, Eclipse, IC, K, LPA Mac and WIN, Master and XSB to always
instantiates the singleton variables list to the empty list. Needed to
prevent backtracking problems in logtalk_load/1 and logtalk_compile/1
predicates.
Removed choice-point in processing metacalls in predicate definitions.
A banner with the Logtalk version is printed after loading the runtime/
pre-processor.
Removed variables example. The category attributes is now part of the
kernel example. Corrected some harmless syntax errors in directives in
kernel/attributes.lgt, kernel/monitor.lgt and miscellaneous/queens.lgt.
Changed name of blocks example to bricks and object "block" to "brick"
in order to avoid problems with some Prolog compilers that use the atom
"block" for operators or built-in predicates.
2.1.0 - May 11, 1999
Fixed some bugs in the definition of the pseudo-object user when sending
the message predicate_property/2.
Renamed config file for Calypso to GNU Prolog.
New config file for LPA WinProlog 4.0.
Corrected the omission in the documentation of the Logtalk grammar of the
built_in entity property.
New tutorial pages about building reflective class-based systems.
Modified pre-processor to compile throw/1 as a control structure to
ensure compatibility with the GNU-Prolog compiler.
Modified pre-processor to ensure compatibility with Prolog compilers that
use immediate update semantics instead of the ISO logical database update.
Improved simplification of compiled object and category clauses.
Rewrite and clean up pre-processor code for better compiler performance.
Several updates to the examples files.
Changed all example loader files to wrap the call to logtalk_load/1 inside
an initialization/1 directive for ISO standard compliance.
2.0 GM - February 9, 1999
Removed some redundant choice-points that are being created when
compiling Logtalk entities.
Small compilation speed optimizations.
Logtalk compiled files now contain the declarations for the message
sending operators to ensure compatibility with some Prolog compilers.
Changed the way Logtalk pre-processor writes directives to ensure
compatibility with some Prolog compilers. Corrected a bug in the
processing of the op/3 directive.
Updated PrologII+ config file for version 4.5.
Changed the definitions of catch/3 and throw/1 in the config files for
LPA Prolog compilers.
New config file for MasterProlog 4.1; removed config file for the
old BIM Prolog 4.0.
Corrected an error in the config file for OpenProlog in the definition
of the write_term/3 predicate.
Added a safer definition for write_term/3 predicate in the config
files for Amzi, Aquarius, Arity, Eclipse, IC, K, LPA Mac, LPA Win,
and XSB Prolog compilers.
Added a QUICK_START file.
2.0 Beta 3 - February 1, 1999
Closed some encapsulation holes in the implementation of super calls.
Changed Logtalk pre-processor to use write_term/3 instead of write/2 and
writeq/2 to workaround some compatibility problems with some Prolog
compilers.
Changed mode operators priority and type to be compatible with the ISO
standard.
Modified definition of predicate read_term/3 in the config file for Amzi
compiler to return the atom end_of_file instead of '!EOF' at the end of
a file (this prevented Logtalk to complete compilation any file under
this compiler). Improved detection of built-in predicates while compiling.
Removed config file for wamcc. This compiler have been replaced by
Calypso (developed by the same author).
Updated K-Prolog config file for version 4.50.
Improved documentation of template config file.
Added SCRIPT files to the kernel and types examples.
Updated Tutorial and User and Reference Manuals.
New end user license.
2.0 Beta 2 - November 16, 1998
Built-ins logtalk_compile/1 and logtalk_load/1 updated to match
the documentation regarding thrown errors and to accept a list of
entities to compile/load.
Modified the examples loader utility files to make only a call to
logtalk_load/1 by using a list of entities. This should make it easy to
modify these files for compilers that don't support arbitrary queries
in a file.
Logtalk runtime no longer tries to catch some of the errors thrown
by ::/2.
Added to all config files a Logtalk predicate to check if a file
exists in the current working directory (used by the logtalk_load/1
and logtalk_compile/1 Logtalk built-in predicates).
New configs files for the K-Prolog 4.14 and Calypso 1.0b6 Prolog
compilers.
Completed the config file for Open Prolog 1.03d38 (with the exception
of lgt_current_date/3 that still have a dummy definition).
Added a missing definition for Logtalk predicate forall/2 to the config
file for Prolog II+ 4.4.
Modified Logtalk pre-processor/runtime to avoid syntax errors when
running on Open Prolog or Calypso and to remove some redundant
choice-points that are being created when compiling categories and
protocols.
Modified some examples that use operators to avoid syntax errors in
some Prolog compilers.
Modified the implementation of the built-in method
predicate_property/2 to avoid duplicate answers and to throw an
instantiation error if the first argument is not bound.
Modified definition of the pseudo-object user to hide Logtalk pre-
processor predicates from the current_predicate/1 built-in method and
to ensure that the predicate_property/2 built-in method returns
Logtalk defined predicate properties for built-in Logtalk and Prolog
predicates.
Modified Prolog code generated by the pre-processor to further minimize
possible conflicts with user defined predicates.
Added a lgt_predicate_property/2 predicate to the config files to
improve Logtalk portability.
Updated Tutorial and User and Reference Manuals.
2.0 Beta 1 - October 18, 1998
Added basic support for implementation multi-inheritance.
Logtalk pre-processor updated to try to detect misspelt local
predicate calls.
First public beta.
2.0 Alpha 1 - July, 1998
First release for registered users.