object

halstead_metric(Stroud)

  • Stroud - Coefficient for computing the time required to program.

Computes Halstead complexity numbers for an entity.

Availability:
logtalk_load(code_metrics(loader))
Author: Paulo Moura
Version: 0:8:0
Date: 2022-05-05
Compilation flags:
static, context_switching_calls
Imports:
Uses:
Remarks:
  • Definition of operators: Predicates declared, user-defined, and called are interpreted as operators. Built-in predicates and built-in control constructs are ignored.

  • Definition of operands: Predicate arguments are abstracted and interpreted as operands. Note that this definition of operands is a significant deviation from the original definition, which used syntactic literals.

  • Pn: Number of distinct predicates (declared, defined, called, or updated).

  • PAn: Number of predicate arguments (assumed distinct).

  • Cn: Number of predicate calls/updates + number of clauses.

  • CAn: Number of predicate call/update arguments + number of clause head arguments.

  • EV: Entity vocabulary: EV = Pn + PAn.

  • EL: Entity length: EL = Cn + CAn.

  • V: Volume: V = EL * log2(EV).

  • D: Difficulty: D = (Pn/2) * (CAn/An).

  • E: Effort: E = D * V.

  • T: Time required to program: T = E/k seconds (k is the Stroud number; defaults to 18).

  • B: Number of delivered bugs: B = V/3000.

  • Entity score: Represented as the compound term pn_pan_cn_can_ev_el_v_d_e_t_b/11.

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)