105 lines
2.6 KiB
Prolog
105 lines
2.6 KiB
Prolog
%%%%%%%%%%%%%%%%%%%%
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% map utilities
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%%%%%%%%%%%%%%%%%%%%
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/**
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* @file maputils.yap
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*
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* @addtogroup maplist
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*
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* Auxiliary routines
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*
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*@{
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*/
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:- module(maputils,
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[compile_aux/2,
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goal_expansion_allowed/0,
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pred_name/4,
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aux_preds/5,
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append_args/3]).
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:- use_module(library(lists), [append/3]).
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:- dynamic number_of_expansions/1.
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number_of_expansions(0).
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compile_aux([Clause|Clauses], Module) :-
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% compile the predicat declaration if needed
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( Clause = (Head :- _)
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; Clause = Head ),
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!,
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functor(Head, F, N),
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( current_predicate(Module:F/N)
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->
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true
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;
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% format("*** Creating auxiliary predicate ~q~n", [F/N]),
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% checklist(portray_clause, [Clause|Clauses]),
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compile_term([Clause|Clauses], Module)
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).
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compile_term([], _).
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compile_term([Clause|Clauses], Module) :-
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assert_static(Module:Clause),
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compile_term(Clauses, Module).
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append_args(Term, Args, NewTerm) :-
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Term =.. [Meta|OldArgs],
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append(OldArgs, Args, GoalArgs),
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NewTerm =.. [Meta|GoalArgs].
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aux_preds(Meta, _, _, _, _) :-
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var(Meta), !,
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fail.
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aux_preds(_:Meta, MetaVars, Pred, PredVars, Proto) :- !,
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aux_preds(Meta, MetaVars, Pred, PredVars, Proto).
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aux_preds(Meta, MetaVars, Pred, PredVars, Proto) :-
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Meta =.. [F|Args],
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aux_args(Args, MetaVars, PredArgs, PredVars, ProtoArgs),
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Pred =.. [F|PredArgs],
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Proto =.. [F|ProtoArgs].
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aux_args([], [], [], [], []).
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aux_args([Arg|Args], MVars, [Arg|PArgs], PVars, [Arg|ProtoArgs]) :-
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ground(Arg), !,
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aux_args(Args, MVars, PArgs, PVars, ProtoArgs).
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aux_args([Arg|Args], [Arg|MVars], [PVar|PArgs], [PVar|PVars], ['_'|ProtoArgs]) :-
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aux_args(Args, MVars, PArgs, PVars, ProtoArgs).
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pred_name(Macro, Arity, _ , Name) :-
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transformation_id(Id),
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atomic_concat(['$$$__Auxiliary_predicate__ for ',Macro,'/',Arity,' ',Id], Name).
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transformation_id(Id) :-
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retract(number_of_expansions(Id)),
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Id1 is Id+1,
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assert(number_of_expansions(Id1)).
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harmless_dcgexception(instantiation_error). % ex: phrase(([1],x:X,[3]),L)
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harmless_dcgexception(type_error(callable,_)). % ex: phrase(27,L)
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%% contains_illegal_dcgnt(+ Term) is semidet.
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%
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% `True` if _Term_ contains a non-terminal we cannot deal with using
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% goal-expansion. The test is too general approximation, but safe.
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contains_illegal_dcgnt(NT) :-
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sub_term(I, NT),
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nonvar(I),
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( I = ! ; I = phrase(_,_,_) ), !.
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% write(contains_illegal_nt(NT)), % JW: we do not want to write
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% nl.
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%% goal_expansion_allowed is semidet.
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%
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% `True` if we can use
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% goal-expansion.
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goal_expansion_allowed :-
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once( prolog_load_context(_, _) ), % make sure we are compiling.
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\+ current_prolog_flag(xref, true).
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/**
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@}
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*/ |