object
halstead_metric(Stroud)
¶
Stroud
- Coefficient for computing the time required to program.
Computes Halstead complexity numbers for an entity.
static, context_switching_calls
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)