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yap-6.3/pl/consult.yap
vsc 35174e0901 fix some encoding stuff and add some documentation. 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1863 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2007-04-03 15:03:11 +00:00

550 lines
18 KiB
Prolog
Raw Blame History

/*************************************************************************
* *
* 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 *
* *
*************************************************************************/
%
% SWI options
% autoload(true,false)
% derived_from(File) -> make
% encoding(Enconding)
% expand({true,false)
% if(changed,true,not_loaded)
% imports(all,List)
% qcompile(true,false)
% silent(true,false) => implemented
% stream(Stream) => implemented
% consult(consult,reconsult)
%
load_files(Files,Opts) :-
'$load_files'(Files,Opts,load_files(Files,Opts)).
'$load_files'(Files,Opts,Call) :-
'$process_lf_opts'(Opts,Silent,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,Files,Call),
'$check_use_module'(Call,UseModule),
'$current_module'(M0),
'$lf'(Files,M0,Call,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,UseModule),
'$close_lf'(Silent).
'$process_lf_opts'(V,_,_,_,_,_,_,_,_,_,_,_,Call) :-
var(V), !,
'$do_error'(instantiation_error,Call).
'$process_lf_opts'([],_,_,_,_,_,_,_,Encoding,_,_,_,_) :-
(var(Encoding) ->
'$default_encoding'(Encoding)
;
true
).
'$process_lf_opts'([Opt|Opts],Silent,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,Files,Call) :-
'$process_lf_opt'(Opt,Silent,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,Files,Call), !,
'$process_lf_opts'(Opts,Silent,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,Files,Call).
'$process_lf_opts'([Opt|_],_,_,_,_,_,_,_,_,_,_,_,Call) :-
'$do_error'(domain_error(unimplemented_option,Opt),Call).
'$process_lf_opt'(autoload(true),_,InfLevel,_,_,_,_,_,_,_,_,_,_) :-
get_value('$verbose_auto_load',VAL),
(VAL = true ->
InfLevel = informational
;
InfLevel = silent
).
'$process_lf_opt'(autoload(false),_,_,_,_,_,_,_,_,_,_,_,_).
'$process_lf_opt'(derived_from(File),_,_,_,_,_,_,_,_,_,_,Files,Call) :-
( atom(File) -> true ; '$do_error'(type_error(atom,File),Call) ),
( atom(Files) -> true ; '$do_error'(type_error(atom,Files),Call) ),
/* call make */
'$do_error'(domain_error(unimplemented_option,derived_from),Call).
'$process_lf_opt'(encoding(Encoding),_,_,_,_,_,_,_,_,EncCode,_,_,Call) :-
( var(Encoding) ->
'$do_error'(instantiation_error,Call)
;
'$valid_encoding'(Encoding, EncCode) ->
true
;
'$do_error'(domain_error(io_mode,encoding(Encoding)),Call)
).
'$process_lf_opt'(expand(true),_,_,true,_,_,_,_,_,_,_,_,Call) :-
'$do_error'(domain_error(unimplemented_option,expand),Call).
'$process_lf_opt'(expand(false),_,_,false,_,_,_,_,_,_,_,_,_).
'$process_lf_opt'(if(changed),_,_,_,changed,_,_,_,_,_,_,_,_).
'$process_lf_opt'(if(true),_,_,_,true,_,_,_,_,_,_,_,_).
'$process_lf_opt'(if(not_loaded),_,_,_,not_loaded,_,_,_,_,_,_,_,_).
'$process_lf_opt'(imports(all),_,_,_,_,_,_,_,_,_,_,_,_).
'$process_lf_opt'(imports(Imports),_,_,_,_,_,Imports,_,_,_,_,_,_).
'$process_lf_opt'(qcompile(true),_,_,_,_,true,_,_,_,_,_,_,Call) :-
'$do_error'(domain_error(unimplemented_option,qcompile),Call).
'$process_lf_opt'(qcompile(false),_,_,_,_,false,_,_,_,_,_,_,_).
'$process_lf_opt'(silent(true),Silent,silent,_,_,_,_,_,_,_,_,_,_) :-
( get_value('$lf_verbose',Silent) -> true ; Silent = informational),
set_value('$lf_verbose',silent).
'$process_lf_opt'(skip_unix_comments,_,_,_,_,_,_,_,_,skip_unix_comments,_,_,_).
'$process_lf_opt'(silent(false),_,_,_,_,_,_,_,_,_,_,_,_).
'$process_lf_opt'(consult(reconsult),_,_,_,_,_,_,_,_,_,reconsult,_,_).
'$process_lf_opt'(consult(consult),_,_,_,_,_,_,_,_,_,consult,_,_).
'$process_lf_opt'(stream(Stream),_,_,_,_,_,_,Stream,_,_,_,Files,Call) :-
/* ( '$stream'(Stream) -> true ; '$do_error'(domain_error(stream,Stream),Call) ), */
( atom(Files) -> true ; '$do_error'(type_error(atom,Files),Call) ).
'$check_use_module'(use_module(_),use_module(_)) :- !.
'$check_use_module'(use_module(_,_),use_module(_)) :- !.
'$check_use_module'(use_module(M,_,_),use_module(M)) :- !.
'$check_use_module'(_,load_files) :- !.
'$lf'(V,_,Call,_,_,_,_,_,_,_,_,_) :- var(V), !,
'$do_error'(instantiation_error,Call).
'$lf'([],_,_,_,_,_,_,_,_,_,_,_,_) :- !.
'$lf'(M:X, _, Call,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,UseModule) :- !,
(
atom(M)
->
'$lf'(X, M, Call,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,UseModule)
;
'$do_error'(type_error(atom,M),Call)
).
'$lf'([F|Fs], Mod,Call,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,UseModule) :- !,
'$lf'(F,Mod,Call,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,_),
'$lf'(Fs, Mod,Call,InfLevel,Expand,Changed,CompilationMode,Imports,Stream,Encoding,SkipUnixComments,Reconsult,UseModule).
'$lf'(_, Mod, _,InfLevel,_,_,CompilationMode,Imports,Stream,_,Reconsult,SkipUnixComments,UseModule) :-
nonvar(Stream), !,
'$do_lf'(Mod, Stream, InfLevel,CompilationMode,Imports,SkipUnixComments,Reconsult,UseModule).
'$lf'(user, Mod, _,InfLevel,_,_,CompilationMode,Imports,_,_,SkipUnixComments,Reconsult,UseModule) :- !,
'$do_lf'(Mod, user_input, InfLevel, CompilationMode,Imports,SkipUnixComments,Reconsult,UseModule).
'$lf'(user_input, Mod, _,InfLevel,_,_,CompilationMode,Imports,_,_,SkipUnixComments,Reconsult,UseModule) :- !,
'$do_lf'(Mod, user_input, InfLevel, CompilationMode,Imports,SkipUnixComments,Reconsult,UseModule).
'$lf'(X, Mod, Call, InfLevel,_,Changed,CompilationMode,Imports,_,Enc,SkipUnixComments,Reconsult,UseModule) :-
'$find_in_path'(X, Y, Call),
'$open'(Y, '$csult', Stream, 0, Enc), !,
'$set_changed_lfmode'(Changed),
'$start_lf'(X, Mod, Stream, InfLevel, CompilationMode, Imports, Changed,SkipUnixComments,Reconsult,UseModule),
'$close'(Stream).
'$lf'(X, _, Call, _, _, _, _, _, _, _, _, _, _) :-
'$do_error'(permission_error(input,stream,X),Call).
'$set_changed_lfmode'(true) :- !.
'$set_changed_lfmode'(_).
'$start_lf'(_, Mod, Stream,_ ,_, Imports, not_loaded, _, _, _) :-
'$file_loaded'(Stream, Mod, Imports), !.
'$start_lf'(_, Mod, Stream, _, _, Imports, changed, _, _, _) :-
'$file_unchanged'(Stream, Mod, Imports), !.
'$start_lf'(_, Mod, Stream, InfLevel, CompilationMode, Imports, _, SkipUnixComments, Reconsult, UseModule) :-
'$do_lf'(Mod, Stream, InfLevel, CompilationMode, Imports, SkipUnixComments, Reconsult, UseModule).
'$close_lf'(Silent) :-
nonvar(Silent), !,
set_value('$lf_verbose',Silent).
'$close_lf'(_).
ensure_loaded(Fs) :-
'$load_files'(Fs, [if(changed)],ensure_loaded(Fs)).
compile(Fs) :-
'$load_files'(Fs, [], compile(Fs)).
consult(Fs) :-
'$has_yap_or',
'$do_error'(context_error(consult(Fs),clause),query).
consult(V) :-
var(V), !,
'$do_error'(instantiation_error,consult(V)).
consult(M0:Fs) :- !,
'$consult'(Fs, M0).
consult(Fs) :-
'$current_module'(M0),
'$consult'(Fs, M0).
'$consult'(Fs,Module) :-
'$access_yap_flags'(8, 2), % SICStus Prolog compatibility
!,
'$load_files'(Module:Fs,[],Fs).
'$consult'(Fs, Module) :-
'$load_files'(Module:Fs,[consult(consult)],Fs).
reconsult(Fs) :-
'$load_files'(Fs, [], reconsult(Fs)).
use_module(F) :-
'$load_files'(F, [if(not_loaded)], use_module(F)).
use_module(F,Is) :-
'$load_files'(F, [if(not_loaded),imports(Is)], use_module(F,Is)).
use_module(M,F,Is) :-
'$use_module'(M,F,Is).
'$use_module'(U,_F,Is) :- nonvar(U), U = user, !,
'$import_to_current_module'(user_input, user, Is).
'$use_module'(M,F,Is) :- nonvar(M), !,
recorded('$module','$module'(F1,M,_),_),
'$load_files'(F1, [if(not_loaded),imports(Is)], use_module(M,F,Is)),
F1 = F.
'$use_module'(M,F,Is) :- nonvar(F),
'$load_files'(F, [if(not_loaded),imports(Is)], use_module(M,F,Is)).
'$csult'(V, _) :- var(V), !,
'$do_error'(instantiation_error,consult(V)).
'$csult'([], _).
'$csult'([-F|L], M) :- !, '$load_files'(M:F, [],[-M:F]), '$csult'(L, M).
'$csult'([F|L], M) :- '$consult'(F, M), '$csult'(L, M).
'$do_lf'(ContextModule, Stream, InfLevel, _, Imports, SkipUnixComments, Reconsult, UseModule) :-
nb_getval('$system_mode', OldMode),
( OldMode == off -> '$enter_system_mode' ; true ),
'$record_loaded'(Stream, ContextModule),
'$current_module'(OldModule,ContextModule),
getcwd(OldD),
get_value('$consulting_file',OldF),
'$set_consulting_file'(Stream),
H0 is heapused, '$cputime'(T0,_),
'$current_stream'(File,_,Stream),
'$fetch_stream_alias'(OldStream,'$loop_stream'),
'$change_alias_to_stream'('$loop_stream',Stream),
get_value('$consulting',Old),
set_value('$consulting',false),
'$access_yap_flags'(18,GenerateDebug),
'$consult_infolevel'(InfLevel),
recorda('$initialisation','$',_),
( Reconsult = reconsult ->
'$start_reconsulting'(File),
'$start_consult'(Reconsult,File,LC),
'$remove_multifile_clauses'(File),
StartMsg = reconsulting,
EndMsg = reconsulted
;
'$start_consult'(Reconsult,File,LC),
StartMsg = consulting,
EndMsg = consulted
),
'$print_message'(InfLevel, loading(StartMsg, File)),
( SkipUnixComments == skip_unix_comments ->
'$skip_unix_comments'(Stream)
;
true
),
'$loop'(Stream,Reconsult),
'$end_consult',
(
Reconsult = reconsult ->
'$clear_reconsulting'
;
true
),
'$change_alias_to_stream'('$loop_stream',OldStream),
'$set_yap_flags'(18,GenerateDebug),
set_value('$consulting',Old),
set_value('$consulting_file',OldF),
cd(OldD),
'$current_module'(Mod,OldModule),
'$bind_module'(Mod, UseModule),
'$import_to_current_module'(File, ContextModule, Imports),
( LC == 0 -> prompt(_,' |: ') ; true),
H is heapused-H0, '$cputime'(TF,_), T is TF-T0,
'$print_message'(InfLevel, loaded(EndMsg, File, Mod, T, H)),
( OldMode == off -> '$exit_system_mode' ; true ),
'$exec_initialisation_goals',
!.
'$bind_module'(_, load_files).
'$bind_module'(Mod, use_module(Mod)).
'$import_to_current_module'(File, M, Imports) :-
recorded('$module','$module'(File,NM,Ps),_), M \= NM, !,
'$use_preds'(Imports, Ps, NM, M).
'$import_to_current_module'(_, _, _).
'$consult_infolevel'(InfoLevel) :- nonvar(InfoLevel), !.
'$consult_infolevel'(InfoLevel) :-
get_value('$lf_verbose',InfoLevel), InfoLevel \= [], !.
'$consult_infolevel'(informational).
'$start_reconsulting'(F) :-
recorda('$reconsulted','$',_),
recorda('$reconsulting',F,_).
'$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) :-
'$show_consult_level'(Level1),
% it will be done after we leave the current consult level.
Level is Level1-1,
recorda('$initialisation',do(Level,G),_),
fail.
'$initialization'(_).
'$exec_initialisation_goals' :-
recorded('$blocking_code',_,R),
erase(R),
fail.
% system goals must be performed first
'$exec_initialisation_goals' :-
recorded('$system_initialisation',G,R),
erase(R),
G \= '$',
call(G),
fail.
'$exec_initialisation_goals' :-
'$show_consult_level'(Level),
recorded('$initialisation',do(Level,G),R),
erase(R),
G \= '$',
'$current_module'(M),
nb_getval('$system_mode', OldMode),
( OldMode == on -> '$exit_system_mode' ; true ),
% run initialization under user control (so allow debugging this stuff).
(
'$system_catch'(once(M:G), M, Error, user:'$LoopError'(Error, top)),
fail
;
OldMode = on,
'$enter_system_mode',
fail
).
'$exec_initialisation_goals'.
'$include'(V, _) :- var(V), !,
'$do_error'(instantiation_error,include(V)).
'$include'([], _) :- !.
'$include'([F|Fs], Status) :- !,
'$include'(F, Status),
'$include'(Fs, Status).
'$include'(X, Status) :-
get_value('$lf_verbose',Verbosity),
'$find_in_path'(X,Y,include(X)),
'$values'('$included_file',OY,Y),
'$current_module'(Mod),
H0 is heapused, '$cputime'(T0,_),
'$default_encoding'(Encoding),
( '$open'(Y,'$csult',Stream,0,Encoding), !,
'$print_message'(Verbosity, loading(including, Y)),
'$loop'(Stream,Status), '$close'(Stream)
;
'$do_error'(permission_error(input,stream,Y),include(X))
),
H is heapused-H0, '$cputime'(TF,_), T is TF-T0,
'$print_message'(Verbosity, loaded(included, Y, Mod, T, H)),
set_value('$included_file',OY).
'$do_startup_reconsult'(X) :-
( '$access_yap_flags'(15, 0) ->
'$system_catch'(load_files(X, []),Module,Error,'$Error'(Error))
;
set_value('$verbose',off),
'$system_catch'(load_files(X, [silent(true),skip_unix_comments]),Module,_,fail)
;
true
),
!,
( '$access_yap_flags'(15, 0) -> true ; halt).
'$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('$consulting_file',[]), !, fail.
prolog_load_context(directory, DirName) :-
getcwd(DirName).
prolog_load_context(file, FileName) :-
get_value('$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'(Stream,'$loop_stream').
prolog_load_context(term_position, Position) :-
'$fetch_stream_alias'(Stream,'$loop_stream'),
stream_position(Stream, Position).
% if the file exports a module, then we can
% be imported from any module.
'$file_loaded'(Stream, M, Imports) :-
'$file_name'(Stream, F),
'$ensure_file_loaded'(F, M, Imports).
'$ensure_file_loaded'(F, M, Imports) :-
recorded('$module','$module'(F1,NM,P),_),
recorded('$lf_loaded','$lf_loaded'(F1,_,_),_),
'$same_file'(F1,F), !,
'$use_preds'(Imports,P, NM, M).
'$ensure_file_loaded'(F, M, _) :-
recorded('$lf_loaded','$lf_loaded'(F1,M,_),_),
'$same_file'(F1,F), !.
% if the file exports a module, then we can
% be imported from any module.
'$file_unchanged'(Stream, M, Imports) :-
'$file_name'(Stream, F),
'$ensure_file_unchanged'(F, M, Imports).
'$ensure_file_unchanged'(F, M, Imports) :-
recorded('$module','$module'(F1,NM,P),_),
recorded('$lf_loaded','$lf_loaded'(F1,_,Age),R),
'$same_file'(F1,F), !,
'$file_is_unchanged'(F, R, Age),
'$use_preds'(Imports, P, NM, M).
'$ensure_file_unchanged'(F, M, _) :-
recorded('$lf_loaded','$lf_loaded'(F1,M,Age),R),
'$same_file'(F1,F), !,
'$file_is_unchanged'(F, R, Age).
'$file_is_unchanged'(F, R, Age) :-
'$file_age'(F,CurrentAge),
((CurrentAge = Age ; Age = -1) -> true; erase(R), fail).
path(Path) :- findall(X,'$in_path'(X),Path).
'$in_path'(X) :- recorded('$path',Path,_),
atom_codes(Path,S),
( S = "" -> X = '.' ;
atom_codes(X,S) ).
add_to_path(New) :- add_to_path(New,last).
add_to_path(New,Pos) :-
atom(New), !,
'$check_path'(New,Str),
atom_codes(Path,Str),
'$add_to_path'(Path,Pos).
'$add_to_path'(New,_) :- recorded('$path',New,R), erase(R), fail.
'$add_to_path'(New,last) :- !, recordz('$path',New,_).
'$add_to_path'(New,first) :- recorda('$path',New,_).
remove_from_path(New) :- '$check_path'(New,Path),
recorded('$path',Path,R), erase(R).
'$check_path'(At,SAt) :- atom(At), !, atom_codes(At,S), '$check_path'(S,SAt).
'$check_path'([],[]).
'$check_path'([Ch],[Ch]) :- '$dir_separator'(Ch), !.
'$check_path'([Ch],[Ch,A]) :- !, integer(Ch), '$dir_separator'(A).
'$check_path'([N|S],[N|SN]) :- integer(N), '$check_path'(S,SN).
% add_multifile_predicate when we start consult
'$add_multifile'(Name,Arity,Module) :-
get_value('$consulting_file',File),
'$add_multifile'(File,Name,Arity,Module).
'$add_multifile'(File,Name,Arity,Module) :-
recorded('$multifile_defs','$defined'(File,Name,Arity,Module), _), !,
'$print_message'(warning,declaration((multifile Module:Name/Arity),ignored)).
'$add_multifile'(File,Name,Arity,Module) :-
recordz('$multifile_defs','$defined'(File,Name,Arity,Module),_), !,
fail.
'$add_multifile'(File,Name,Arity,Module) :-
recorded('$mf','$mf_clause'(File,Name,Arity,Module,Ref),R),
erase(R),
'$erase_clause'(Ref,Module),
fail.
'$add_multifile'(_,_,_,_).
% retract old multifile clauses for current file.
'$remove_multifile_clauses'(FileName) :-
recorded('$multifile_defs','$defined'(FileName,_,_,_),R1),
erase(R1),
fail.
'$remove_multifile_clauses'(FileName) :-
recorded('$mf','$mf_clause'(FileName,_,_,Module,Ref),R),
'$erase_clause'(Ref, Module),
erase(R),
fail.
'$remove_multifile_clauses'(_).
'$set_consulting_file'(user) :- !,
set_value('$consulting_file',user_input).
'$set_consulting_file'(user_input) :- !,
set_value('$consulting_file',user_input).
'$set_consulting_file'(Stream) :-
'$file_name'(Stream,F),
set_value('$consulting_file',F),
'$set_consulting_dir'(F).
%
% Use directory where file exists
%
'$set_consulting_dir'(F) :-
file_directory_name(F, Dir),
cd(Dir).
'$record_loaded'(Stream, M) :-
Stream \= user,
Stream \= user_input,
'$file_name'(Stream,F),
( recorded('$lf_loaded','$lf_loaded'(F,M,_),R), erase(R), fail ; true ),
'$file_age'(F,Age),
recorda('$lf_loaded','$lf_loaded'(F,M,Age),_),
fail.
'$record_loaded'(_, _).
'$system_library_directories'(Dir) :-
getenv('YAPSHAREDIR', Dir).
'$system_library_directories'(Dir) :-
get_value(system_library_directory,Dir).
%
% encoding stuff: what I believe SWI does.
%
% 8-bit binaries
'$valid_encoding'(octet, 0).
% 7-bit ASCII as America originally intended
'$valid_encoding'(ascii, 2).
% Ye europeaners made it 8 bits
'$valid_encoding'(iso_latin_1, 1).
% UTF-8: default 8 bits but 80 extends to 16bits
'$valid_encoding'(utf8, 8).
% UNICODE: 16 bits throughout, the way it was supposed to be!
'$valid_encoding'(unicode_be, 16).
'$valid_encoding'(unicode_le, 32).
% whatever the system tell us to do.
'$valid_encoding'(text, 4).
'$default_encoding'(DefCode) :- nonvar(DefCode), !,
'$encoding'('$stream'(0),DefCode),
'$encoding'('$stream'(1),DefCode),
'$encoding'('$stream'(2),DefCode),
set_value('$default_encoding',DefCode).
'$default_encoding'(DefCode) :-
get_value('$default_encoding',DefCode0),
( DefCode0 == [] ->
'$get_default_encoding'(DefCode)
;
DefCode = DefCode0
).
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