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yap-6.3/pl/consult.yap

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: consult.yap *
* Last rev: 8/2/88 *
* mods: *
* comments: Consulting Files in YAP *
* *
*************************************************************************/
ensure_loaded(V) :-
'$ensure_loaded'(V).
'$ensure_loaded'(V) :- var(V), !,
'$do_error'(instantiation_error,ensure_loaded(V)).
'$ensure_loaded'([]) :- !.
'$ensure_loaded'([F|Fs]) :- !,
'$ensure_loaded'(F),
'$ensure_loaded'(Fs).
'$ensure_loaded'(M:X) :- atom(M), !,
'$current_module'(M0),
'$change_module'(M),
'$ensure_loaded'(X),
'$change_module'(M0).
'$ensure_loaded'(X) :-
'$find_in_path'(X,Y,ensure_loaded(X)),
'$open'(Y, '$csult', Stream, 0), !,
( '$loaded'(Stream,TFN) ->
( '$recorded'('$module','$module'(TFN,M,P),_) ->
'$current_module'(T), '$import'(P,M,T)
;
true
)
;
'$reconsult'(X,Stream)
),
'$close'(Stream).
'$ensure_loaded'(X) :-
'$do_error'(permission_error(input,stream,X),ensure_loaded(X)).
compile(P) :-
'$has_yap_or',
'$do_error'(context_error(compile(P),clause),query).
compile(P) :-
'$compile'(P).
% leave compile mode to 1 for native code.
'$compile'(A) :-
'$compile_mode'(Old,0),
'$reconsult'(A),
'$compile_mode'(_,Old).
consult(Fs) :-
'$has_yap_or',
'$do_error'(context_error(consult(Fs),clause),query).
consult(Fs) :-
'$consult'(Fs).
reconsult(Fs) :-
'$has_yap_or', fail,
'$do_error'(context_error(reconsult(Fs),clause),query).
reconsult(Fs) :-
'$reconsult'(Fs).
'$reconsult'(V) :- var(V), !,
'$do_error'(instantiation_error,reconsult(V)).
'$reconsult'([]) :- !.
'$reconsult'(M:X) :- atom(M), !,
'$current_module'(M0),
'$change_module'(M),
'$reconsult'(X),
'$change_module'(M0).
'$reconsult'([F|Fs]) :- !,
'$reconsult'(F),
'$reconsult'(Fs).
'$reconsult'(X) :-
'$find_in_path'(X,Y,reconsult(X)),
'$open'(Y,'$csult',Stream,0), !,
'$reconsult'(X,Stream),
'$close'(Stream).
'$reconsult'(X) :-
'$do_error'(permission_error(input,stream,X),reconsult(X)).
'$reconsult'(F,Stream) :-
'$record_loaded'(Stream),
fail.
'$reconsult'(F,Stream) :-
'$getcwd'(OldD),
'$get_value'('$consulting_file',OldF),
'$set_consulting_file'(Stream),
H0 is heapused, '$cputime'(T0,_),
current_stream(File,_,Stream),
'$get_value'('$consulting',Old),
'$set_value'('$consulting',false),
'$current_module'(OldModule),
'$start_reconsulting'(F),
'$start_consult'(reconsult,File,LC),
'$recorda'('$initialisation','$',_),
'$print_message'(informational, loading(reconsulting, File)),
'$loop'(Stream,reconsult),
'$current_module'(Mod,OldModule),
'$end_consult',
'$clear_reconsulting',
( LC == 0 -> prompt(_,' |: ') ; true),
H is heapused-H0, '$cputime'(TF,_), T is TF-T0,
'$print_message'(informational, loaded(reconsulted, File, Mod, T, H)),
'$set_value'('$consulting',Old),
'$set_value'('$consulting_file',OldF),
'$cd'(OldD),
'$exec_initialisation_goals',
!.
'$start_reconsulting'(F) :-
'$recorda'('$reconsulted','$',_),
'$recorda'('$reconsulting',F,_).
'EMACS_FILE'(F,File0) :-
'$format'('''EMACS_RECONSULT''(~w).~n',[File0]),
'$getcwd'(OldD),
'$open'(F,'$csult',Stream,0),
'$find_in_path'(File0,File,emacs(F)),
'$open'(File,'$csult',Stream0,0),
'$get_value'('$consulting_file',OldF),
'$set_consulting_file'(Stream0),
H0 is heapused, '$cputime'(T0,_),
'$get_value'('$consulting',Old),
'$set_value'('$consulting',false),
'$start_reconsulting'(File),
'$start_consult'(reconsult,File,LC),
'$current_module'(OldModule),
'$recorda'('$initialisation','$',_),
'$print_message'(informational, loading(reconsulting, File)),
'$loop'(Stream,reconsult),
'$current_module'(Mod,OldModule),
'$end_consult',
'$clear_reconsulting',
( LC == 0 -> prompt(_,' |: ') ; true),
H is heapused-H0, '$cputime'(TF,_), T is TF-T0,
'$print_message'(informational, loaded(reconsulted, File, Mod, T, H)),
'$set_value'('$consulting',Old),
'$set_value'('$consulting_file',OldF),
'$cd'(OldD),
'$exec_initialisation_goals',
!.
'$initialization'(V) :-
var(V), !,
'$do_error'(instantiation_error,initialization(V)).
'$initialization'(C) :- number(C), !,
'$do_error'(type_error(callable,C),initialization(C)).
'$initialization'(C) :- db_reference(C), !,
'$do_error'(type_error(callable,C),initialization(C)).
'$initialization'(G) :-
'$recorda'('$initialisation',G,_),
fail.
'$initialization'(_).
'$include'(V, _) :- var(V), !,
'$do_error'(instantiation_error,include(V)).
'$include'([], _) :- !.
'$include'([F|Fs], Status) :- !,
'$include'(F, Status),
'$include'(Fs, Status).
'$include'(X, Status) :-
'$find_in_path'(X,Y,include(X)),
'$values'('$included_file',OY,Y),
( '$open'(Y,'$csult',Stream,0), !,
'$loop'(Stream,Status), '$close'(Stream)
;
'$do_error'(permission_error(input,stream,Y),include(X))
),
'$set_value'('$included_file',OY).
'$do_startup_reconsult'(X) :-
( '$access_yap_flags'(15, 0) ->
true
;
'$set_value'('$verbose',off)
),
( '$find_in_path'(X,Y,reconsult(X)),
'$open'(Y,'$csult',Stream,0) ->
( '$access_yap_flags'(15, 0) -> true ; '$skip_unix_comments'(Stream) ),
'$reconsult'(X,Stream), '$close'(Stream)
;
'$output_error_message'(permission_error(input,stream,X),reconsult(X))
),
( '$access_yap_flags'(15, 0) -> true ; halt).
'$skip_unix_comments'(Stream) :-
'$peek'(Stream, 0'#), !, % 35 is ASCII for #
'$get0_line_codes'(Stream, _),
'$skip_unix_comments'(Stream).
'$skip_unix_comments'(_).
prolog_load_context(_, _) :-
'$get_value'('$consulting_file',[]), !, fail.
prolog_load_context(directory, DirName) :-
'$get_value'('$consulting_file',FileName),
(FileName = user_input ->
'$getcwd'(S),
atom_codes(DirName,S)
;
atom_codes(FileName,S),
'$strip_file_for_scd'(S,Dir,Unsure,Unsure),
atom_codes(DirName,Dir)
).
prolog_load_context(file, FileName) :-
'$get_value'('$included_file',IncFileName),
( IncFileName = [] ->
'$get_value'('$consulting_file',FileName)
;
FileName = IncFileName
).
prolog_load_context(module, X) :-
'$current_module'(X).
prolog_load_context(source, FileName) :-
'$get_value'('$consulting_file',FileName).
prolog_load_context(stream, Stream) :-
'$fetch_stream_alias'('$loop_stream', Stream).
prolog_load_context(term_position, Position) :-
'$fetch_stream_alias'('$loop_stream', Stream),
stream_position(Stream, Position).
'$loaded'(Stream,F1) :-
'$file_name'(Stream,F), %
'$recorded'('$loaded','$loaded'(F1,Age),R),
'$same_file'(F1,F), !,
'$file_age'(F,CurrentAge),
((CurrentAge = Age ; Age = -1) -> true; erase(R), fail).