177 lines
4.7 KiB
Prolog
177 lines
4.7 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: checker.yap *
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* comments: style checker for Prolog *
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* *
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* Last rev: $Date: 2008-03-31 22:56:22 $,$Author: vsc $ *
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* *
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*************************************************************************/
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/**
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* @file checker.yap
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*
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*/
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:- system_module( style_checker, [no_style_check/1,
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style_check/1], ['$check_term'/5,
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'$sv_warning'/2,
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'$syntax_check_discontiguous'/2,
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'$syntax_check_multiple'/2,
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'$syntax_check_single_var'/2]).
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/**
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@defgroup YAPStyleChecker Style Checker
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@ingroup YAPCompilerSettings
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@{
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YAP implements a style-checker thay currently verifies whether:
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1 named variables occur once in a clause.
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2 clauses from dofferent predicates are mixed together.
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3 clauses for the same predicate occur in different files.
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One can declare a predicate to be discontiguous (see the
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discontiguous/1 declaration) and/or multifile/1.
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*/
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/*
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@pred style_check(+ _X_)
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Turns on style checking according to the attribute specified by _X_,
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which must be one of the following:
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+ single_var
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Checks single occurrences of named variables in a clause.
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+ discontiguous
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Checks non-contiguous clauses for the same predicate in a file.
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+ multiple
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Checks the presence of clauses for the same predicate in more than one
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file when the predicate has not been declared as `multifile`
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+ all
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Performs style checking for all the cases mentioned above.
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By default, style checking is disabled in YAP unless we are in
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`sicstus` or `iso` language mode.
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The style_check/1 built-in is now deprecated. Please use
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`set_prolog_flag/1` instead.
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**/
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%
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% A Small style checker for YAP
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style_check(V) :- var(V), !, fail.
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style_check(V) :-
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\+atom(V),
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\+ is_list(V),
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V \= + _,
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V \= - _, !,
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'$do_error'( type_error('+|-|?(Flag)', V), style_check(V) ).
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style_check(V) :-
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\+atom(V),
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\+ is_list(V),
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V \= + _,
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V \= + _, !,
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'$do_error'( domain_error(style_name, V), style_check(V) ).
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style_check(all) :-
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style_check( [ singleton, discontiguous, multiple ] ).
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style_check(+X) :-
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style_check(X).
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style_check(single_var) :-
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style_check( singleton ).
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style_check(singleton) :-
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yap_flag( single_var_warnings, true ).
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style_check(-single_var) :-
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yap_flag( single_var_warnings, false ).
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style_check(-singleton) :-
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yap_flag( single_var_warnings, false ).
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style_check(discontiguous) :-
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yap_flag( discontiguous_warnings, true ).
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style_check(-discontiguous) :-
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yap_flag( discontiguous_warnings, false ).
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style_check(multiple) :-
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yap_flag( redefine_warnings, true ).
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style_check(-multiple) :-
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yap_flag( redefine_warnings, false ).
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style_check(no_effect).
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style_check(+no_effect) .
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style_check(-no_effect).
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style_check(var_branches).
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style_check(+var_branches) :-
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'$style_checker'( [ var_branches ] ).
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style_check(-var_branches) :-
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'$style_checker'( [ -var_branches ] ).
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style_check(atom).
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style_check(+atom) :-
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'$style_checker'( [ atom ] ).
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style_check(-atom) :-
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'$style_checker'( [ -atom ] ).
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style_check(charset) :-
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'$style_checker'( [ charset ] ).
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style_check(+charset) :-
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'$style_checker'( [ charset ] ).
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style_check(-charset) :-
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'$style_checker'( [ -charset ] ).
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style_check('?'(Info) ) :-
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L = [ singleton, discontiguous, multiple ],
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( lists:member(Style, L ) -> Info = +Style ; Info = -Style ).
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style_check([]).
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style_check([H|T]) :- style_check(H), style_check(T).
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/** @pred no_style_check(+ _X_)
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Turns off style checking according to the attribute specified by
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_X_, which have the same meaning as in style_check/1.
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The no_style_check/1 built-in is now deprecated. Please use
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`set_prolog_flag/1` instead.
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**/
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no_style_check(V) :- var(V), !, fail.
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no_style_check(all) :-
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'$style_checker'( [ -singleton, -discontiguous, -multiple ] ).
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no_style_check(-single_var) :-
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'$style_checker'( [ -singleton ] ).
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no_style_check(-singleton) :-
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'$style_checker'( [ -singleton ] ).
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no_style_check(-discontiguous) :-
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'$style_checker'( [ -discontiguous ] ).
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no_style_check(-multiple) :-
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'$style_checker'( [ -multiple ] ).
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no_style_check([]).
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no_style_check([H|T]) :- no_style_check(H), no_style_check(T).
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/**
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* @pred discontiguous(+ G) is iso, directive
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Avoid warnings from the sytax checker.
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Declare that the predicate _G_ or list of predicates are discontiguous
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procedures, that is, clauses for discontigous procedures may be
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separated by clauses from other procedures.
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*/
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discontiguous(P) :- '$discontiguous'(P).
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/**
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@}
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*/
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