142 lines
3.7 KiB
Prolog
142 lines
3.7 KiB
Prolog
/**
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** @file imports.yapi
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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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* @ingroup 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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mimp :-
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recorded('$import',I,_), %'$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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'$get_undefined_predicates'(ImportingMod:G,ExportingMod:G0) :-
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recorded('$import','$import'(ExportingMod,ImportingMod,G,G0,_,_),_)
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->
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true
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;
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%% this should have been caught before
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'$is_system_predicate'(G, prolog)
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->
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true
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;
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% autoload
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current_prolog_flag(autoload, true)
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->
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'$autoload'(G, ImportingMod, ExportingMod, swi)
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;
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'$parent_module'(ImportingMod, NewImportingMod)
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->
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'$get_undefined_predicates'(NewImportingMod:G, ExportingMod:G0).
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/**
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*
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* @pred '$continue_imported'(+Modn, +ModOut, +Predn ,+PredOut)
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*
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* @return
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*/
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'$continue_imported'(Mod:Pred,Mod,Pred) :-
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'$pred_exists'(Pred, Mod),
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!.
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'$continue_imported'(FM:FPred,Mod:Pred) :-
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'$get_undefined_predicates'(FM:FPred, ModI:PredI),
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'$continue_imported'(ModI:PredI,Mod:Pred).
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%
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'$get_undefined_pred'(ImportingMod:G, ExportingMod:G0) :-
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must_be_callablle( ImportingMod:G ),
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'$get_undefined_predicates'(ImportingMod:G, ExportingMod:G0).
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% be careful here not to generate an undefined exception.
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'$imported_predicate'(ImportingMod:G, ExportingMod:G0) :-
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var(G) ->
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'$current_predicate'(_,G,ImportingMod,_),
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'$imported_predicate'(ImportingMod:G, ExportingMod:G0)
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;
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var(ImportingMod) ->
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current_module(ImportingMod),
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'$imported_predicate'(ImportingMod:G, ExportingMod:G0)
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;
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'$undefined'(G, ImportingMod),
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'$get_undefined_predicates'(ImportingMod:G, ExportingMod:G0),
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ExportingMod \= ImportingMod.
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% check if current module redefines an imported predicate.
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% and remove import.
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%
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'$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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'$not_imported'(_, _).
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'$verify_import'(_M:G, prolog:G) :-
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'$is_system_predicate'(G, prolog).
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'$verify_import'(M:G, NM:NG) :-
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'$get_undefined_pred'(G, M, NG, NM),
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!.
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'$verify_import'(MG, MG).
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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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% assert_static(ExportingMod:G0 :- ImportingMod:G0),
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(recordzifnot('$import','$import'(ExportingMod,ImportingMod,G0,G0, N ,K),_) -> true ; true ).
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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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'$autoloader_find_predicate'(G,ExportingMod) :-
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yap_flag(autoload, true, false),
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yap_flag( unknown, Unknown, fail),
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yap_flag(debug, Debug, false), !,
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load_files([library(autoloader),
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autoloader:library('NDEX'),
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swi:library('dialect/swi/NDEX')],
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[autoload(true),if(not_loaded)]),
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nb_setval('$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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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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