161 lines
4.2 KiB
Prolog
161 lines
4.2 KiB
Prolog
/**
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** @file imports.yap
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*
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* @brief Module systemm code to import predicates
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*
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* This code does not provide visible builtins.
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*/
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/**
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* @addtogroup ModuleBuiltins
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* @{
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*
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* YAP follows the following protovol:
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* - predicate is in current module;
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* - predicate is in user
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* - predicate will be autoloaded, SWI style.
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*/
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:- '$mk_dynamic'('$parent_module'(_,_),prolog).
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/** @pred mimp
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debug import table
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*/
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mimp :-
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recorded('$import',I,_),
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%'$import'(ExportingMod,ImportingMod,G0,G,_,_),_),
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writeln(I),
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%(ImportingMod:G :- ExportingMod:G0)),
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fail.
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%:- start_low_level_trace.
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% parent module mechanism
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%% system has priority
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'$get_predicate_definition'(_ImportingMod:G,prolog:G) :-
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nonvar(G).
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%% I am there, no need to import
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'$get_predicate_definition'(Mod:Pred,Mod:Pred) :-
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nonvar(Pred).
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%% export table
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'$get_predicate_definition'(ImportingMod:G,ExportingMod:G0) :-
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recorded('$import','$import'(ExportingMod,ImportingMod,G0,G,_,_),_).
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%% parent/user
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'$get_predicate_definition'(ImportingMod:G,PMod:G) :-
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( '$parent_module'(ImportingMod, PMod) ; PMod = user ),
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ImportingMod \= PMod.
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%% autoload`
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%'$get_predicate_definition'(ImportingMod:G,ExportingMod:G) :-
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% current_prolog_flag(autoload, true),
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% '$autoload'(G, ImportingMod, ExportingMod, swi).
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'$predicate_definition'(Imp:Pred,Exp:NPred) :-
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'$predicate_definition'(Imp:Pred,[],Exp:NPred),
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'$pred_exists'(NPred,Exp),
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%writeln((Imp:Pred -> Exp:NPred )).
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!.
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'$one_predicate_definition'(Imp:Pred,Exp:NPred) :-
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'$get_predicate_definition'(Imp:Pred,[],Exp:NPred),
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'$pred_exists'(NPred,Exp),
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%writeln((Imp:Pred -> Exp:NPred )).
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!.
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'$one_predicate_definition'(Exp:Pred,Exp:Pred).
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'$predicate_definition'(M0:Pred0,Path,ModF:PredF) :-
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'$get_predicate_definition'(M0:Pred0, Mod:Pred),
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(
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'$pred_exists'(Pred,Mod), Mod = ModF, Pred = PredF
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;
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\+ lists:member(Mod:Pred,Path),
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'$predicate_definition'(Mod:Pred,[Mod:Pred|Path], ModF:PredF)
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).
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%
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'$get_undefined_predicate'(ImportingMod:G, ExportingMod:G0) :-
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must_be_callable( ImportingMod:G ),
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'$predicate_definition'(ImportingMod:G,[], ExportingMod:G0),
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ImportingMod:G \= ExportingMod:G0,
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!.
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% be careful here not to generate an undefined exception.
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'$imported_predicate'(ImportingMod:G, ExportingMod:G0) :-
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( var(ImportingMod) ->
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current_module(ImportingMod)
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;
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true
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),
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(
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var(G) ->
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'$current_predicate'(_,G,ImportingMod,_)
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;
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true
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),
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(
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'$undefined'(G, ImportingMod)
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->
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'$predicate_definition'(ImportingMod:G, ExportingMod:G0),
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ExportingMod \= ImportingMod
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;
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ExportingMod = ImportingMod, G = G0
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).
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% check if current module redefines an imported predicate.
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% and remove import.
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%
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'$not_imported'(H, Mod) :-
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recorded('$import','$import'(NM,Mod,NH,H,_,_),R),
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NM \= Mod,
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functor(NH,N,Ar),
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print_message(warning,redefine_imported(Mod,NM,N/Ar)),
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erase(R),
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fail.
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'$not_imported'(_, _).
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'$autoload'(G, _mportingMod, ExportingMod, Dialect) :-
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functor(G, Name, Arity),
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'$pred_exists'(index(Name,Arity,ExportingMod,_),Dialect),
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call(Dialect:index(Name,Arity,ExportingMod,_)),
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!.
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'$autoload'(G, ImportingMod, ExportingMod, _Dialect) :-
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functor(G, N, K),
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functor(G0, N, K),
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'$autoloader_find_predicate'(G0,ExportingMod),
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ExportingMod \= ImportingMod,
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(recordzifnot('$import','$import'(ExportingMod,ImportingMod,G0,G0, N ,K),_),
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\+ '$is_system_predicate'(G0, ExportingMod)
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->
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'$compile'((G:-ExportingMod:G0), reconsult ,(ImportingMod:G:-ExportingMod:G0), ImportingMod, _)
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;
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true
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).
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'$autoloader_find_predicate'(G,ExportingMod) :-
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'__NB_getval__'('$autoloader_set', true, false), !,
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autoloader:find_predicate(G,ExportingMod).
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'$autoloader_find_predicate'(G,ExportingMod) :-
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yap_flag(autoload, true, false),
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yap_flag( unknown, Unknown, fail),
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yap_flag(debug, Debug, false), !,
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load_files([library(autoloader)],[silent(true)]),
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nb_setval('$autoloader_set', true),
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yap_flag(autoload, _, true),
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yap_flag( unknown, _, Unknown),
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yap_flag( debug, _, Debug),
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setup_autoloader:find_predicate(G,ExportingMod).
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/**
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*
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* @}
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*/
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