799 lines
22 KiB
Prolog
799 lines
22 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: preds.yap *
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* Last rev: 8/2/88 *
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* mods: *
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* comments: Predicate Manipulation for YAP *
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* *
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*************************************************************************/
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/**
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* @defgroup Database Using the Clausal Data Base
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* @ingroup builtins
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* @{
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Predicates in YAP may be dynamic or static. By default, when
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consulting or reconsulting, predicates are assumed to be static:
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execution is faster and the code will probably use less space.
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Static predicates impose some restrictions: in general there can be no
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addition or removal of clauses for a procedure if it is being used in the
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current execution.
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Dynamic predicates allow programmers to change the Clausal Data Base with
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the same flexibility as in C-Prolog. With dynamic predicates it is
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always possible to add or remove clauses during execution and the
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semantics will be the same as for C-Prolog. But the programmer should be
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aware of the fact that asserting or retracting are still expensive operations,
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and therefore he should try to avoid them whenever possible.
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*/
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:- system_module( '$_preds', [abolish/1,
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abolish/2,
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assert/1,
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assert/2,
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assert_static/1,
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asserta/1,
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asserta/2,
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asserta_static/1,
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assertz/1,
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assertz/2,
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assertz_static/1,
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clause/2,
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clause/3,
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clause_property/2,
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compile_predicates/1,
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current_key/2,
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current_predicate/1,
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current_predicate/2,
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dynamic_predicate/2,
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hide_predicate/1,
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nth_clause/3,
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predicate_erased_statistics/4,
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predicate_property/2,
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predicate_statistics/4,
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retract/1,
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retract/2,
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retractall/1,
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stash_predicate/1,
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system_predicate/1,
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system_predicate/2,
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unknown/2], ['$assert_static'/5,
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'$assertz_dynamic'/4,
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'$clause'/4,
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'$current_predicate'/4,
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'$init_preds'/0,
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'$noprofile'/2,
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'$public'/2,
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'$unknown_error'/1,
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'$unknown_warning'/1]).
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:- use_system_module( '$_boot', ['$check_head_and_body'/4,
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'$check_if_reconsulted'/2,
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'$handle_throw'/3,
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'$head_and_body'/3,
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'$inform_as_reconsulted'/2]).
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:- use_system_module( '$_errors', ['$do_error'/2]).
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:- use_system_module( '$_init', ['$do_log_upd_clause'/6,
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'$do_log_upd_clause0'/6,
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'$do_log_upd_clause_erase'/6,
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'$do_static_clause'/5]).
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:- use_system_module( '$_modules', ['$imported_pred'/4,
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'$meta_predicate'/4,
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'$module_expansion'/5]).
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:- use_system_module( '$_preddecls', ['$check_multifile_pred'/3,
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'$dynamic'/2]).
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:- use_system_module( '$_strict_iso', ['$check_iso_strict_clause'/1]).
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/** @pred assert_static(: _C_)
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Adds clause _C_ to a static procedure. Asserting a static clause
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for a predicate while choice-points for the predicate are available has
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undefined results.
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*/
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assert_static(C) :-
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strip_module(C, Mod, C1),
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'$assert_static'(C1, Mod,last,_,assert_static(C)).
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/** @pred asserta_static(: _C_)
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Adds clause _C_ as the first clause for a static procedure.
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*/
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asserta_static(C) :-
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strip_module(C, Mod, C1),
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'$assert_static'(C1,Mod,first,_,asserta_static(C)).
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/** @pred assertz_static(: _C_)
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Adds clause _C_ to the end of a static procedure. Asserting a
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static clause for a predicate while choice-points for the predicate are
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available has undefined results.
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The following predicates can be used for dynamic predicates and for
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static predicates, if source mode was on when they were compiled:
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*/
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assertz_static(C) :-
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strip_module(C, Mod, C1),
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'$assert_static'(C1,Mod,last,_,assertz_static(C)).
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'$assert_static'(V,M,_,_,_) :- var(V), !,
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'$do_error'(instantiation_error,assert(M:V)).
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'$assert_static'((H:-_G),_M1,_Where,_R,P) :-
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var(H), !, '$do_error'(instantiation_error,P).
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'$assert_static'(CI,Mod,Where,R,P) :-
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'$expand_clause'(CI,C0,C,Mod, HM),
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'$check_head_and_body'(C,H,B,P),
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( '$is_dynamic'(H, HM) ->
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'$do_error'(permission_error(modify,dynamic_procedure,HM:Na/Ar),P)
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;
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'$undefined'(H,HM), get_value('$full_iso',true) ->
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functor(H,Na,Ar), '$dynamic'(Na/Ar, HM), '$assertat_d'(Where,H,B,C0,HM,R)
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;
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'$assert1'(Where,C,C0,HM,H)
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).
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'$assert1'(last,C,C0,Mod,_) :- '$compile'(C,0,C0,Mod).
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'$assert1'(first,C,C0,Mod,_) :- '$compile'(C,2,C0,Mod).
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/** @pred clause(+ _H_, _B_) is iso
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A clause whose head matches _H_ is searched for in the
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program. Its head and body are respectively unified with _H_ and
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_B_. If the clause is a unit clause, _B_ is unified with
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_true_.
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This predicate is applicable to static procedures compiled with
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`source` active, and to all dynamic procedures.
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*/
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clause(V0,Q) :-
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strip_module(V0, M, V),
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'$clause'(V,M,Q,_).
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/** @pred clause(+ _H_, _B_,- _R_)
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The same as clause/2, plus _R_ is unified with the
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reference to the clause in the database. You can use instance/2
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to access the reference's value. Note that you may not use
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erase/1 on the reference on static procedures.
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*/
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clause(P,Q,R) :- var(P), !,
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'$current_module'(M),
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'$clause'(P,M,Q,R).
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clause(V0,Q,R) :-
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strip_module(V0, M, V),
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'$clause'(V,M,Q,R).
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'$clause'(P,M,Q,R) :-
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'$instance_module'(R,M0), !,
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M0 = M,
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instance(R,T),
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( T = (H :- B) -> P = H, Q = B ; P=T, Q = true).
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'$clause'(V,M,Q,R) :- var(V), !,
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'$do_error'(instantiation_error,clause(M:V,Q,R)).
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'$clause'(C,M,Q,R) :-
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number(C), !,
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'$do_error'(type_error(callable,C),clause(M:C,Q,R)).
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'$clause'(C,M,Q,R) :-
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db_reference(C), !,
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'$do_error'(type_error(callable,C),clause(M:R,Q,R)).
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'$clause'(M:P,_,Q,R) :- !,
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'$clause'(P,M,Q,R).
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'$clause'(P,M,Q,R) :-
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'$is_exo'(P, M), !,
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Q = true,
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R = '$exo_clause'(M,P),
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'$execute0'(P, M).
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'$clause'(P,M,Q,R) :-
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'$is_source'(P, M), !,
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'$static_clause'(P,M,Q,R).
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'$clause'(P,M,Q,R) :-
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'$is_log_updatable'(P, M), !,
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'$log_update_clause'(P,M,Q,R).
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'$clause'(P,M,Q,R) :-
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'$some_recordedp'(M:P), !,
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'$recordedp'(M:P,(P:-Q),R).
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'$clause'(P,M,Q,R) :-
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\+ '$undefined'(P,M),
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( '$system_predicate'(P,M) -> true ;
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'$number_of_clauses'(P,M,N), N > 0 ),
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functor(P,Name,Arity),
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'$do_error'(permission_error(access,private_procedure,Name/Arity),
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clause(M:P,Q,R)).
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'$init_preds' :-
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once('$handle_throw'(_,_,_)),
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fail.
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'$init_preds' :-
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once('$do_static_clause'(_,_,_,_,_)),
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fail.
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'$init_preds' :-
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once('$do_log_upd_clause0'(_,_,_,_,_,_)),
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fail.
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'$init_preds' :-
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once('$do_log_upd_clause'(_,_,_,_,_,_)),
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fail.
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'$init_preds' :-
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once('$do_log_upd_clause_erase'(_,_,_,_,_,_)),
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fail.
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'$init_preds'.
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:- '$init_preds'.
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/** @pred nth_clause(+ _H_, _I_,- _R_)
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Find the _I_th clause in the predicate defining _H_, and give
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a reference to the clause. Alternatively, if the reference _R_ is
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given the head _H_ is unified with a description of the predicate
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and _I_ is bound to its position.
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*/
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nth_clause(V,I,R) :-
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strip_module(V, M1, P), !,
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'$nth_clause'(P, M1, I, R).
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'$nth_clause'(P,M,I,R) :-
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var(I), var(R), !,
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'$clause'(P,M,_,R),
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'$fetch_nth_clause'(P,M,I,R).
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'$nth_clause'(P,M,I,R) :-
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'$fetch_nth_clause'(P,M,I,R).
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/** @pred abolish(+ _P_,+ _N_)
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Completely delete the predicate with name _P_ and arity _N_. It will
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remove both static and dynamic predicates. All state on the predicate,
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including whether it is dynamic or static, multifile, or
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meta-predicate, will be lost.
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*/
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abolish(N0,A) :-
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strip_module(N0, Mod, N), !,
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'$abolish'(N,A,Mod).
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'$abolish'(N,A,M) :- var(N), !,
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'$do_error'(instantiation_error,abolish(M:N,A)).
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'$abolish'(N,A,M) :- var(A), !,
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'$do_error'(instantiation_error,abolish(M:N,A)).
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'$abolish'(N,A,M) :-
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( recorded('$predicate_defs','$predicate_defs'(N,A,M,_),R) -> erase(R) ),
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fail.
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'$abolish'(N,A,M) :- functor(T,N,A),
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( '$is_dynamic'(T, M) -> '$abolishd'(T,M) ;
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/* else */ '$abolishs'(T,M) ).
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/** @pred abolish(+ _PredSpec_) is iso
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Deletes the predicate given by _PredSpec_ from the database. If
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§§ _PredSpec_ is an unbound variable, delete all predicates for the
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current module. The
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specification must include the name and arity, and it may include module
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information. Under <tt>iso</tt> language mode this built-in will only abolish
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dynamic procedures. Under other modes it will abolish any procedures.
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*/
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abolish(X0) :-
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strip_module(X0,M,X),
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'$abolish'(X,M).
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'$abolish'(X,M) :-
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current_prolog_flag(language, sicstus), !,
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'$new_abolish'(X,M).
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'$abolish'(X, M) :-
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'$old_abolish'(X,M).
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'$new_abolish'(V,M) :- var(V), !,
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'$abolish_all'(M).
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'$new_abolish'(A,M) :- atom(A), !,
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'$abolish_all_atoms'(A,M).
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'$new_abolish'(Na//Ar1, M) :-
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integer(Ar1),
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!,
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Ar is Ar1+2,
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'$new_abolish'(Na//Ar, M).
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'$new_abolish'(Na/Ar, M) :-
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functor(H, Na, Ar),
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'$is_dynamic'(H, M), !,
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'$abolishd'(H, M).
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'$new_abolish'(Na/Ar, M) :- % succeed for undefined procedures.
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functor(T, Na, Ar),
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'$undefined'(T, M), !.
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'$new_abolish'(Na/Ar, M) :-
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'$do_error'(permission_error(modify,static_procedure,Na/Ar),abolish(M:Na/Ar)).
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'$new_abolish'(T, M) :-
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'$do_error'(type_error(predicate_indicator,T),abolish(M:T)).
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'$abolish_all'(M) :-
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'$current_predicate'(Na, M, S, _),
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functor(S, Na, Ar),
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'$new_abolish'(Na/Ar, M),
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fail.
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'$abolish_all'(_).
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'$abolish_all_atoms'(Na, M) :-
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'$current_predicate'(Na,M,S,_),
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functor(S, Na, Ar),
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'$new_abolish'(Na/Ar, M),
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fail.
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'$abolish_all_atoms'(_,_).
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'$check_error_in_predicate_indicator'(V, Msg) :-
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var(V), !,
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'$do_error'(instantiation_error, Msg).
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'$check_error_in_predicate_indicator'(M:S, Msg) :- !,
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'$check_error_in_module'(M, Msg),
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'$check_error_in_predicate_indicator'(S, Msg).
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'$check_error_in_predicate_indicator'(S, Msg) :-
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S \= _/_,
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S \= _//_, !,
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'$do_error'(type_error(predicate_indicator,S), Msg).
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'$check_error_in_predicate_indicator'(Na/_, Msg) :-
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var(Na), !,
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'$do_error'(instantiation_error, Msg).
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'$check_error_in_predicate_indicator'(Na/_, Msg) :-
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\+ atom(Na), !,
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'$do_error'(type_error(atom,Na), Msg).
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'$check_error_in_predicate_indicator'(_/Ar, Msg) :-
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var(Ar), !,
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'$do_error'(instantiation_error, Msg).
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'$check_error_in_predicate_indicator'(_/Ar, Msg) :-
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\+ integer(Ar), !,
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'$do_error'(type_error(integer,Ar), Msg).
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'$check_error_in_predicate_indicator'(_/Ar, Msg) :-
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Ar < 0, !,
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'$do_error'(domain_error(not_less_than_zero,Ar), Msg).
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% not yet implemented!
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%'$check_error_in_predicate_indicator'(Na/Ar, Msg) :-
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% Ar < maxarity, !,
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% '$do_error'(type_error(representation_error(max_arity),Ar), Msg).
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'$check_error_in_module'(M, Msg) :-
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var(M), !,
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'$do_error'(instantiation_error, Msg).
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'$check_error_in_module'(M, Msg) :-
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\+ atom(M), !,
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'$do_error'(type_error(atom,M), Msg).
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'$old_abolish'(V,M) :- var(V), !,
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( current_prolog_flag(language, sicstus) ->
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'$do_error'(instantiation_error,abolish(M:V))
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;
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'$abolish_all_old'(M)
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).
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'$old_abolish'(N/A, M) :- !,
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'$abolish'(N, A, M).
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'$old_abolish'(A,M) :- atom(A), !,
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( current_prolog_flag(language, iso) ->
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'$do_error'(type_error(predicate_indicator,A),abolish(M:A))
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;
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'$abolish_all_atoms_old'(A,M)
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).
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'$old_abolish'([], _) :- !.
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'$old_abolish'([H|T], M) :- !, '$old_abolish'(H, M), '$old_abolish'(T, M).
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'$old_abolish'(T, M) :-
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'$do_error'(type_error(predicate_indicator,T),abolish(M:T)).
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'$abolish_all_old'(M) :-
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'$current_predicate'(Na, M, S, _),
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functor( S, Na, Ar ),
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'$abolish'(Na, Ar, M),
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fail.
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'$abolish_all_old'(_).
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'$abolish_all_atoms_old'(Na, M) :-
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'$current_predicate'(Na, M, S, _),
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functor(S, Na, Ar),
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'$abolish'(Na, Ar, M),
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fail.
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'$abolish_all_atoms_old'(_,_).
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'$abolishs'(G, M) :- '$system_predicate'(G,M), !,
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functor(G,Name,Arity),
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'$do_error'(permission_error(modify,static_procedure,Name/Arity),abolish(M:G)).
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'$abolishs'(G, Module) :-
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current_prolog_flag(language, sicstus), % only do this in sicstus mode
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'$undefined'(G, Module),
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functor(G,Name,Arity),
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print_message(warning,no_match(abolish(Module:Name/Arity))).
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'$abolishs'(G, M) :-
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'$is_multifile'(G,M),
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functor(G,Name,Arity),
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recorded('$mf','$mf_clause'(_,Name,Arity,M,_Ref),R),
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erase(R),
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% no need erase(Ref),
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fail.
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'$abolishs'(T, M) :-
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recorded('$import','$import'(_,M,_,_,T,_,_),R),
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erase(R),
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fail.
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'$abolishs'(G, M) :-
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'$purge_clauses'(G, M), fail.
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'$abolishs'(_, _).
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/** @pred stash_predicate(+ _Pred_) @anchor stash_predicate
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Make predicate _Pred_ invisible to new code, and to `current_predicate/2`,
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`listing`, and friends. New predicates with the same name and
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functor can be declared.
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**/
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stash_predicate(P0) :-
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strip_module(P0, M, P),
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'$stash_predicate2'(P, M).
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'$stash_predicate2'(V, M) :- var(V), !,
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'$do_error'(instantiation_error,stash_predicate(M:V)).
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'$stash_predicate2'(N/A, M) :- !,
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functor(S,N,A),
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'$stash_predicate'(S, M) .
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'$stash_predicate2'(PredDesc, M) :-
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'$do_error'(type_error(predicate_indicator,PredDesc),stash_predicate(M:PredDesc)).
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/** @pred @pred hide_predicate(+ _Pred_)
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|
Make predicate _Pred_ invisible to `current_predicate/2`,
|
|
`listing`, and friends.
|
|
|
|
**/
|
|
hide_predicate(V) :- var(V), !,
|
|
'$do_error'(instantiation_error,hide_predicate(V)).
|
|
hide_predicate(P0) :-
|
|
strip_module(P0, M, P),
|
|
'$hide_predicate2'(P, M).
|
|
|
|
'$hide_predicate2'(V, M) :- var(V), !,
|
|
'$do_error'(instantiation_error,hide_predicate(M:V)).
|
|
'$hide_predicate2'(N/A, M) :- !,
|
|
functor(S,N,A),
|
|
'$hide_predicate'(S, M) .
|
|
'$hide_predicate2'(PredDesc, M) :-
|
|
'$do_error'(type_error(predicate_indicator,PredDesc),hide_predicate(M:PredDesc)).
|
|
|
|
/** @pred predicate_property( _P_, _Prop_) is iso
|
|
|
|
|
|
For the predicates obeying the specification _P_ unify _Prop_
|
|
with a property of _P_. These properties may be:
|
|
|
|
+ `built_in `
|
|
true for built-in predicates,
|
|
|
|
+ `dynamic`
|
|
true if the predicate is dynamic
|
|
|
|
+ `static `
|
|
true if the predicate is static
|
|
|
|
+ `meta_predicate( _M_) `
|
|
true if the predicate has a meta_predicate declaration _M_.
|
|
|
|
+ `multifile `
|
|
true if the predicate was declared to be multifile
|
|
|
|
+ `imported_from( _Mod_) `
|
|
true if the predicate was imported from module _Mod_.
|
|
|
|
+ `exported `
|
|
true if the predicate is exported in the current module.
|
|
|
|
+ `public`
|
|
true if the predicate is public; note that all dynamic predicates are
|
|
public.
|
|
|
|
+ `tabled `
|
|
true if the predicate is tabled; note that only static predicates can
|
|
be tabled in YAP.
|
|
|
|
+ `source (predicate_property flag) `
|
|
true if source for the predicate is available.
|
|
|
|
+ `number_of_clauses( _ClauseCount_) `
|
|
Number of clauses in the predicate definition. Always one if external
|
|
or built-in.
|
|
|
|
*/
|
|
predicate_property(Pred,Prop) :-
|
|
strip_module(Pred, Mod, TruePred),
|
|
'$predicate_property2'(TruePred,Prop,Mod).
|
|
|
|
'$predicate_property2'(Pred, Prop, Mod) :-
|
|
var(Mod), !,
|
|
'$all_current_modules'(Mod),
|
|
'$predicate_property2'(Pred, Prop, Mod).
|
|
'$predicate_property2'(Pred,Prop,M0) :-
|
|
var(Pred), !,
|
|
(M = M0 ;
|
|
M = prolog ;
|
|
M = user), % prolog and user modules are automatically incorporate in every other module
|
|
'$generate_all_preds_from_mod'(Pred, SourceMod, M),
|
|
'$predicate_property'(Pred,SourceMod,M,Prop).
|
|
'$predicate_property2'(M:Pred,Prop,_) :- !,
|
|
'$predicate_property2'(Pred,Prop,M).
|
|
'$predicate_property2'(Pred,Prop,Mod) :-
|
|
'$pred_exists'(Pred,Mod), !,
|
|
'$predicate_property'(Pred,Mod,Mod,Prop).
|
|
'$predicate_property2'(Pred,Prop,Mod) :-
|
|
'$imported_predicate'(Pred, Mod, NPred, M),
|
|
(
|
|
Prop = imported_from(M)
|
|
;
|
|
'$predicate_property'(NPred,M,M,Prop),
|
|
Prop \= exported
|
|
).
|
|
|
|
'$generate_all_preds_from_mod'(Pred, M, M) :-
|
|
'$current_predicate'(_Na,M,Pred,user).
|
|
'$generate_all_preds_from_mod'(Pred, SourceMod, Mod) :-
|
|
recorded('$import','$import'(SourceMod, Mod, Orig, Pred,_,_),_),
|
|
'$pred_exists'(Orig, SourceMod).
|
|
|
|
'$predicate_property'(P,M,_,built_in) :-
|
|
'$system_predicate'(P,M).
|
|
'$predicate_property'(P,M,_,source) :-
|
|
'$predicate_flags'(P,M,F,F),
|
|
F /\ 0x00400000 =\= 0.
|
|
'$predicate_property'(P,M,_,tabled) :-
|
|
'$predicate_flags'(P,M,F,F),
|
|
F /\ 0x00000040 =\= 0.
|
|
'$predicate_property'(P,M,_,dynamic) :-
|
|
'$is_dynamic'(P,M).
|
|
'$predicate_property'(P,M,_,static) :-
|
|
\+ '$is_dynamic'(P,M),
|
|
\+ '$undefined'(P,M).
|
|
'$predicate_property'(P,M,_,meta_predicate(Q)) :-
|
|
functor(P,Na,Ar),
|
|
'$meta_predicate'(Na,M,Ar,Q).
|
|
'$predicate_property'(P,M,_,multifile) :-
|
|
'$is_multifile'(P,M).
|
|
'$predicate_property'(P,M,_,public) :-
|
|
'$is_public'(P,M).
|
|
'$predicate_property'(P,M,_,thread_local) :-
|
|
'$is_thread_local'(P,M).
|
|
'$predicate_property'(P,M,M,exported) :-
|
|
functor(P,N,A),
|
|
once(recorded('$module','$module'(_TFN,M,_S,Publics,_L),_)),
|
|
lists:memberchk(N/A,Publics).
|
|
'$predicate_property'(P,Mod,_,number_of_clauses(NCl)) :-
|
|
'$number_of_clauses'(P,Mod,NCl).
|
|
'$predicate_property'(P,Mod,_,file(F)) :-
|
|
'$owner_file'(P,Mod,F).
|
|
|
|
|
|
/**
|
|
@pred predicate_statistics( _P_, _NCls_, _Sz_, _IndexSz_)
|
|
|
|
Given predicate _P_, _NCls_ is the number of clauses for
|
|
_P_, _Sz_ is the amount of space taken to store those clauses
|
|
(in bytes), and _IndexSz_ is the amount of space required to store
|
|
indices to those clauses (in bytes).
|
|
*/
|
|
predicate_statistics(V,NCls,Sz,ISz) :- var(V), !,
|
|
'$do_error'(instantiation_error,predicate_statistics(V,NCls,Sz,ISz)).
|
|
predicate_statistics(P0,NCls,Sz,ISz) :-
|
|
strip_module(P0, M, P),
|
|
'$predicate_statistics'(P,M,NCls,Sz,ISz).
|
|
|
|
'$predicate_statistics'(M:P,_,NCls,Sz,ISz) :- !,
|
|
'$predicate_statistics'(P,M,NCls,Sz,ISz).
|
|
'$predicate_statistics'(P,M,NCls,Sz,ISz) :-
|
|
'$is_log_updatable'(P, M), !,
|
|
'$lu_statistics'(P,NCls,Sz,ISz,M).
|
|
'$predicate_statistics'(P,M,_,_,_) :-
|
|
'$system_predicate'(P,M), !, fail.
|
|
'$predicate_statistics'(P,M,_,_,_) :-
|
|
'$undefined'(P,M), !, fail.
|
|
'$predicate_statistics'(P,M,NCls,Sz,ISz) :-
|
|
'$static_pred_statistics'(P,M,NCls,Sz,ISz).
|
|
|
|
/** @pred predicate_erased_statistics( _P_, _NCls_, _Sz_, _IndexSz_)
|
|
|
|
|
|
Given predicate _P_, _NCls_ is the number of erased clauses for
|
|
_P_ that could not be discarded yet, _Sz_ is the amount of space
|
|
taken to store those clauses (in bytes), and _IndexSz_ is the amount
|
|
of space required to store indices to those clauses (in bytes).
|
|
|
|
*/
|
|
predicate_erased_statistics(P,NCls,Sz,ISz) :-
|
|
var(P), !,
|
|
current_predicate(_,P),
|
|
predicate_erased_statistics(P,NCls,Sz,ISz).
|
|
predicate_erased_statistics(P0,NCls,Sz,ISz) :-
|
|
strip_module(P0,M,P),
|
|
'$predicate_erased_statistics'(M:P,NCls,Sz,_,ISz).
|
|
|
|
/** @pred current_predicate( _A_, _P_)
|
|
|
|
Defines the relation: _P_ is a currently defined predicate whose name is the atom _A_.
|
|
*/
|
|
current_predicate(A,T0) :-
|
|
'$yap_strip_module'(T0, M, T),
|
|
(
|
|
'$current_predicate'(A, M, T, user)
|
|
;
|
|
'$imported_predicate'(T, M, SourceT, SourceMod),
|
|
functor(T, A, _),
|
|
\+ '$system_predicate'(SourceT, SourceMod)
|
|
).
|
|
|
|
/** @pred system_predicate( _A_, _P_)
|
|
|
|
Defines the relation: _P_ is a built-in predicate whose name
|
|
is the atom _A_.
|
|
|
|
*/
|
|
system_predicate(A,T1) :-
|
|
'$yap_strip_module'( T1, M, T),
|
|
(
|
|
M \= prolog,
|
|
'$current_predicate'(A, M, T0, system)
|
|
;
|
|
'$imported_predicate'(T, M, SourceT, SourceMod),
|
|
M \= prolog,
|
|
functor(T, A, _),
|
|
'$system_predicate'(SourceT, SourceMod)
|
|
;
|
|
'$current_predicate'(A, prolog, T0, system)
|
|
).
|
|
|
|
/** @pred system_predicate( ?_P_ )
|
|
|
|
Defines the relation: _P_ is a currently defined system predicate.
|
|
*/
|
|
system_predicate(P) :-
|
|
strip_module(M, P),
|
|
system_predicate(_, M:P).
|
|
|
|
|
|
/**
|
|
@pred current_predicate( _F_) is iso
|
|
|
|
True if _F_ is the predicate indicator for a currently defined user or
|
|
library predicate.The indicator _F_ is of the form _Mod_:_Na_/_Ar_ or _Na/Ar_,
|
|
where the atom _Mod_ is the module of the predicate,
|
|
_Na_ is the name of the predicate, and _Ar_ its arity.
|
|
*/
|
|
current_predicate(F0) :-
|
|
'$yap_strip_module'(F0, M, AN),
|
|
( AN = A/N
|
|
->
|
|
current_predicate(A, M:S),
|
|
functor( S, A, N)
|
|
;
|
|
AN == A//N
|
|
->
|
|
current_predicate(A, M:S),
|
|
Ar2 is N+2,
|
|
functor( S, A, Ar2)
|
|
).
|
|
|
|
'$imported_predicate'(A, ImportingMod, A/Arity, G, Flags) :-
|
|
'$get_undefined_pred'(G, ImportingMod, G0, ExportingMod),
|
|
functor(G, A, Arity),
|
|
'$pred_exists'(G, ExportingMod),
|
|
'$predicate_flags'(G0, ExportingMod, Flags, Flags).
|
|
|
|
/** @pred current_key(? _A_,? _K_)
|
|
|
|
|
|
Defines the relation: _K_ is a currently defined database key whose
|
|
name is the atom _A_. It can be used to generate all the keys for
|
|
the internal data-base.
|
|
*/
|
|
current_key(A,K) :-
|
|
'$current_predicate'(A,idb,K,user).
|
|
|
|
% do nothing for now.
|
|
'$noprofile'(_, _).
|
|
|
|
'$ifunctor'(Pred,Na,Ar) :-
|
|
(Ar > 0 ->
|
|
functor(Pred, Na, Ar)
|
|
;
|
|
Pred = Na
|
|
).
|
|
|
|
|
|
/** @pred compile_predicates(: _ListOfNameArity_)
|
|
|
|
|
|
|
|
Compile a list of specified dynamic predicates (see dynamic/1 and
|
|
assert/1 into normal static predicates. This call tells the
|
|
Prolog environment the definition will not change anymore and further
|
|
calls to assert/1 or retract/1 on the named predicates
|
|
raise a permission error. This predicate is designed to deal with parts
|
|
of the program that is generated at runtime but does not change during
|
|
the remainder of the program execution.
|
|
*/
|
|
compile_predicates(Ps) :-
|
|
'$current_module'(Mod),
|
|
'$compile_predicates'(Ps, Mod, compile_predicates(Ps)).
|
|
|
|
'$compile_predicates'(V, _, Call) :-
|
|
var(V), !,
|
|
'$do_error'(instantiation_error,Call).
|
|
'$compile_predicates'(M:Ps, _, Call) :-
|
|
'$compile_predicates'(Ps, M, Call).
|
|
'$compile_predicates'([], _, _).
|
|
'$compile_predicates'([P|Ps], M, Call) :-
|
|
'$compile_predicate'(P, M, Call),
|
|
'$compile_predicates'(Ps, M, Call).
|
|
|
|
'$compile_predicate'(P, _M, Call) :-
|
|
var(P), !,
|
|
'$do_error'(instantiation_error,Call).
|
|
'$compile_predicate'(M:P, _, Call) :-
|
|
'$compile_predicate'(P, M, Call).
|
|
'$compile_predicate'(Na/Ar, Mod, _Call) :-
|
|
functor(G, Na, Ar),
|
|
findall((G.B),clause(Mod:G,B),Cls),
|
|
abolish(Mod:Na,Ar),
|
|
'$add_all'(Cls, Mod).
|
|
|
|
'$add_all'([], _).
|
|
'$add_all'((G.B).Cls, Mod) :-
|
|
assert_static(Mod:(G:-B)),
|
|
'$add_all'(Cls, Mod).
|
|
|
|
|
|
clause_property(ClauseRef, file(FileName)) :-
|
|
( recorded('$mf','$mf_clause'(FileName,_Name,_Arity,_Module,ClauseRef),_R)
|
|
-> true
|
|
;
|
|
instance_property(ClauseRef, 2, FileName) ).
|
|
clause_property(ClauseRef, source(FileName)) :-
|
|
( recorded('$mf','$mf_clause'(FileName,_Name,_Arity,_Module,ClauseRef),_R)
|
|
-> true
|
|
;
|
|
instance_property(ClauseRef, 2, FileName) ).
|
|
clause_property(ClauseRef, line_count(LineNumber)) :-
|
|
instance_property(ClauseRef, 4, LineNumber),
|
|
LineNumber > 0.
|
|
clause_property(ClauseRef, fact) :-
|
|
instance_property(ClauseRef, 3, true).
|
|
clause_property(ClauseRef, erased) :-
|
|
instance_property(ClauseRef, 0, true).
|
|
clause_property(ClauseRef, predicate(PredicateIndicator)) :-
|
|
instance_property(ClauseRef, 1, PredicateIndicator).
|
|
|
|
'$set_predicate_attribute'(M:N/Ar, Flag, V) :-
|
|
functor(P, N, Ar),
|
|
'$set_flag'(P, M, Flag, V).
|
|
|
|
|
|
/**
|
|
@}
|
|
*/
|