1351 lines
34 KiB
Prolog
Executable File
1351 lines
34 KiB
Prolog
Executable File
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-2014 *
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* *
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**************************************************************************
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* *
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* File: boot.yap *
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* Last rev: 8/2/88 *
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* mods: *
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* comments: boot file for Prolog *
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* *
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*************************************************************************/
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system_module(_init, _SysExps, _Decls) :- !.
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system_module(M, SysExps, Decls) :-
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'$current_module'(prolog, M),
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'$compile'( ('$system_module'(M) :- true), 0, assert_static('$system_module'(M)), M ),
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'$export_preds'(SysExps, prolog),
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'$export_preds'(Decls, M).
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'$export_preds'([], _).
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'$export_preds'([N/A|Decls], M) :-
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functor(S, N, A),
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'$sys_export'(S, M),
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'$export_preds'(Decls, M).
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use_system_module(_init, _SysExps) :- !.
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use_system_module(M, SysExps) :-
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'$current_module'(M0, M0),
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'$import_system'(SysExps, M0, M).
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'$import_system'([], _, _).
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'$import_system'([N/A|Decls], M0, M) :-
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functor(S, N, A),
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'$compile'( (G :- M0:G) ,0, assert_static((M:G :- M0:G)), M ),
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'$import_system'(Decls, M0, M).
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private(_).
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%
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% boootstrap predicates.
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%
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:- system_module( '$_boot', [(*->)/2,
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(',')/2,
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(->)/2,
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(;)/2,
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(\+)/1,
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bootstrap/1,
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call/1,
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catch/3,
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catch_ball/2,
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expand_term/2,
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import_system_module/2,
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incore/1,
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(not)/1,
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repeat/0,
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throw/1,
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true/0,
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('|')/2], ['$$compile'/4,
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'$call'/4,
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'$catch'/3,
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'$check_callable'/2,
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'$check_head_and_body'/4,
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'$check_if_reconsulted'/2,
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'$clear_reconsulting'/0,
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'$command'/4,
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'$cut_by'/1,
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'$disable_debugging'/0,
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'$do_live'/0,
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'$enable_debugging'/0,
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'$find_goal_definition'/4,
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'$handle_throw'/3,
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'$head_and_body'/3,
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'$inform_as_reconsulted'/2,
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'$init_system'/0,
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'$init_win_graphics'/0,
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'$live'/0,
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'$loop'/2,
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'$meta_call'/2,
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'$prompt_alternatives_on'/1,
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'$run_at_thread_start'/0,
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'$system_catch'/4,
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'$undefp'/1,
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'$version'/0]).
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:- use_system_module( '$_absf', ['$system_library_directories'/2]).
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:- use_system_module( '$_checker', ['$check_term'/5,
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'$sv_warning'/2]).
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:- use_system_module( '$_consult', ['$csult'/2]).
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:- use_system_module( '$_control', ['$run_atom_goal'/1]).
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:- use_system_module( '$_directives', ['$all_directives'/1,
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'$exec_directives'/5]).
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:- use_system_module( '$_errors', ['$do_error'/2]).
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:- use_system_module( '$_grammar', ['$translate_rule'/2]).
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:- use_system_module( '$_modules', ['$get_undefined_pred'/4,
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'$meta_expansion'/6,
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'$module_expansion'/5]).
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:- use_system_module( '$_preddecls', ['$dynamic'/2]).
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:- use_system_module( '$_preds', ['$assert_static'/5,
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'$assertz_dynamic'/4,
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'$init_preds'/0,
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'$unknown_error'/1,
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'$unknown_warning'/1]).
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:- use_system_module( '$_qly', ['$init_state'/0]).
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:- use_system_module( '$_strict_iso', ['$check_iso_strict_clause'/1,
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'$iso_check_goal'/2]).
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%
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%
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%
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true :- true.
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'$live' :-
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'$init_system',
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'$do_live'.
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'$init_prolog' :-
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'$init_system'.
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'$do_live' :-
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repeat,
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'$current_module'(Module),
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( Module==user ->
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'$compile_mode'(_,0)
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;
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format(user_error,'[~w]~n', [Module])
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),
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'$system_catch'('$enter_top_level',Module,Error,user:'$Error'(Error)).
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'$init_system' :-
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get_value('$yap_inited', true), !.
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'$init_system' :-
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set_value('$yap_inited', true),
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% do catch as early as possible
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(
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'$access_yap_flags'(15, 0),
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'$access_yap_flags'(22, 0),
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\+ '$uncaught_throw'
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->
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'$version'
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;
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true
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),
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(
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'$access_yap_flags'(22, 0) ->
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'$swi_set_prolog_flag'(verbose, normal)
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;
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'$swi_set_prolog_flag'(verbose, silent)
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),
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% '$init_preds', % needs to be done before library_directory
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% (
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% retractall(user:library_directory(_)),
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% '$system_library_directories'(D),
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% assertz(user:library_directory(D)),
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% fail
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% ;
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% true
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% ),
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'$swi_current_prolog_flag'(file_name_variables, OldF),
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'$swi_set_prolog_flag'(file_name_variables, true),
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'$init_consult',
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'$swi_set_prolog_flag'(file_name_variables, OldF),
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'$init_win_graphics',
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'$init_globals',
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'$swi_set_prolog_flag'(fileerrors, true),
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set_value('$gc',on),
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('$exit_undefp' -> true ; true),
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prompt1(' ?- '),
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'$swi_set_prolog_flag'(debug, false),
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% simple trick to find out if this is we are booting from Prolog.
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% boot from a saved state
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(
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'$undefined'('$init_preds',prolog)
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->
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true
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;
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'$init_state'
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),
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'$db_clean_queues'(0),
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% this must be executed from C-code.
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% '$startup_saved_state',
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set_input(user_input),
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set_output(user_output),
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'$init_or_threads',
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'$run_at_thread_start'.
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'$init_globals' :-
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% '$swi_set_prolog_flag'(break_level, 0),
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% '$set_read_error_handler'(error), let the user do that
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nb_setval('$chr_toplevel_show_store',false).
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'$init_consult' :-
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set_value('$open_expands_filename',true),
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nb_setval('$assert_all',off),
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nb_setval('$if_level',0),
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nb_setval('$endif',off),
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nb_setval('$initialization_goals',off),
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nb_setval('$included_file',[]),
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\+ '$undefined'('$init_preds',prolog),
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'$init_preds',
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fail.
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'$init_consult' :-
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retractall(user:library_directory(_)),
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'$system_library_directories'(library, D),
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assert(user:library_directory(D)),
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fail.
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'$init_consult' :-
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retractall(user:commons_directory(_)),
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'$system_library_directories'(commons, D),
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assert(user:commons_directory(D)),
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fail.
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'$init_consult'.
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'$init_win_graphics' :-
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'$undefined'(window_title(_,_), system), !.
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'$init_win_graphics' :-
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load_files([library(win_menu)], [silent(true),if(not_loaded)]),
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fail.
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'$init_win_graphics'.
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'$init_or_threads' :-
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'$c_yapor_workers'(W), !,
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'$start_orp_threads'(W).
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'$init_or_threads'.
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'$start_orp_threads'(1) :- !.
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'$start_orp_threads'(W) :-
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thread_create('$c_worker',_,[detached(true)]),
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W1 is W-1,
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'$start_orp_threads'(W1).
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% Start file for yap
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/* I/O predicates */
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/* meaning of flags for '$write' is
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1 quote illegal atoms
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2 ignore operator declarations
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4 output '$VAR'(N) terms as A, B, C, ...
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8 use portray(_)
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*/
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/* main execution loop */
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'$read_toplevel'(Goal, Bindings) :-
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'$pred_exists'(read_history(_,_,_,_,_,_), user),
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'$swi_current_prolog_flag'(readline, true), !,
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read_history(h, '!h',
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[trace, end_of_file],
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Prompt, Goal, Bindings), !,
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(nonvar(Err) ->
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print_message(error,Err), fail
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;
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true
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).
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'$read_toplevel'(Goal, Bindings) :-
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prompt1('?- '),
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prompt(_,'|: '),
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'$system_catch'('$raw_read'(user_input, Line), prolog, E,
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(print_message(error, E),
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'$handle_toplevel_error'(Line, E))),
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(
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'$pred_exists'(rl_add_history(_), user)
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->
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format(atom(CompleteLine), '~W~W',
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[ Line, [partial(true)],
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'.', [partial(true)]
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]),
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user:rl_add_history(CompleteLine)
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;
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true
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),
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'$system_catch'(
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atom_to_term(Line, Goal, Bindings), prolog, E,
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( print_message(error, E),
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fail
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)
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), !.
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'$handle_toplevel_error'(_, syntax_error(_)) :- !, fail.
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'$handle_toplevel_error'(end_of_file, error(io_error(read,user_input),_)) :- !.
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'$handle_toplevel_error'(_, E) :-
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throw(E).
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% reset alarms when entering top-level.
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'$enter_top_level' :-
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'$alarm'(0, 0, _, _),
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fail.
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'$enter_top_level' :-
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'$clean_up_dead_clauses',
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fail.
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'$enter_top_level' :-
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'$swi_current_prolog_flag'(break_level, BreakLevel),
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'$swi_current_prolog_flag'(debug, DBON),
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(
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'$nb_getval'('$trace', on, fail)
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->
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TraceDebug = trace
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;
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DBON == true
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->
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TraceDebug = debug
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;
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true
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),
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print_message(informational,prompt(BreakLevel,TraceDebug)),
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fail.
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'$enter_top_level' :-
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get_value('$top_level_goal',GA), GA \= [], !,
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set_value('$top_level_goal',[]),
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'$run_atom_goal'(GA),
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'$swi_current_prolog_flag'(break_level, BreakLevel),
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( Breaklevel \= 0 -> true ; '$pred_exists'(halt(_), user) -> halt(0) ; '$halt'(0) ).
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'$enter_top_level' :-
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flush_output,
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'$run_toplevel_hooks',
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prompt1(' ?- '),
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'$read_toplevel'(Command,Varnames),
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nb_setval('$spy_gn',1),
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% stop at spy-points if debugging is on.
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nb_setval('$debug_run',off),
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nb_setval('$debug_jump',off),
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'$command'(Command,Varnames,_Pos,top),
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'$swi_current_prolog_flag'(break_level, BreakLevel),
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( BreakLevel \= 0 -> true ; '$pred_exists'(halt(_), user) -> halt(0) ; '$halt'(0) ).
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'$erase_sets' :-
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eraseall('$'),
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eraseall('$$set'),
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eraseall('$$one'),
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eraseall('$reconsulted'), fail.
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'$erase_sets' :- \+ recorded('$path',_,_), recorda('$path',"",_).
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'$erase_sets'.
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'$version' :-
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get_value('$version_name',VersionName),
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print_message(help, version(VersionName)),
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get_value('$myddas_version_name',MYDDASVersionName),
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MYDDASVersionName \== [],
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print_message(help, myddas_version(MYDDASVersionName)),
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fail.
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'$version' :-
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recorded('$version',VersionName,_),
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print_message(help, VersionName),
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fail.
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'$version'.
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repeat :- '$repeat'.
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'$repeat'.
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'$repeat'.
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'$repeat'.
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'$repeat'.
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'$repeat'.
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'$repeat'.
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'$repeat'.
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'$repeat'.
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'$repeat'.
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'$repeat' :- '$repeat'.
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'$start_corouts' :-
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eraseall('$corout'),
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eraseall('$result'),
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eraseall('$actual'),
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fail.
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'$start_corouts' :- recorda('$actual',main,_),
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recordz('$corout','$corout'(main,main,'$corout'([],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[])),_Ref),
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recorda('$result',going,_).
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'$command'(C,VL,Pos,Con) :-
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'$access_yap_flags'(9,1), !,
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'$execute_command'(C,VL,Pos,Con,C).
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'$command'(C,VL,Pos,Con) :-
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( (Con = top ; var(C) ; C = [_|_]) ->
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'$execute_command'(C,VL,Pos,Con,C), ! ;
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% do term expansion
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expand_term(C, EC),
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% execute a list of commands
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'$execute_commands'(EC,VL,Pos,Con,C),
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% succeed only if the *original* was at end of file.
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C == end_of_file
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).
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%
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% Hack in case expand_term has created a list of commands.
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%
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'$execute_commands'(V,_,_,_,Source) :- var(V), !,
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'$do_error'(instantiation_error,meta_call(Source)).
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'$execute_commands'([],_,_,_,_) :- !.
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'$execute_commands'([C|Cs],VL,Pos,Con,Source) :- !,
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(
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'$system_catch'('$execute_command'(C,VL,Pos,Con,C),prolog,Error,user:'$LoopError'(Error, Con)),
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fail
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;
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'$execute_commands'(Cs,VL,Pos,Con,Source)
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).
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'$execute_commands'(C,VL,Pos,Con,Source) :-
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'$execute_command'(C,VL,Pos,Con,Source).
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%
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%
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%
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'$execute_command'(C,_,_,top,Source) :- var(C), !,
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'$do_error'(instantiation_error,meta_call(Source)).
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'$execute_command'(C,_,_,top,Source) :- number(C), !,
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'$do_error'(type_error(callable,C),meta_call(Source)).
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'$execute_command'(R,_,_,top,Source) :- db_reference(R), !,
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'$do_error'(type_error(callable,R),meta_call(Source)).
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'$execute_command'(end_of_file,_,_,_,_) :- !.
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'$execute_command'(Command,_,_,_,_) :-
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'$nb_getval'('$if_skip_mode', skip, fail),
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\+ '$if_directive'(Command),
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!.
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'$execute_command'((:-G),VL,Pos,Option,_) :-
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% !,
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Option \= top, !,
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'$current_module'(M),
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% allow user expansion
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expand_term((:- G), O),
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(
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O = (:- G1)
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->
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'$process_directive'(G1, Option, M, VL, Pos)
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;
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'$execute_commands'(O,VL,Pos,Option,O)
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).
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'$execute_command'((?-G), V, Pos, Option, Source) :-
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Option \= top, !,
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'$execute_command'(G, V, Pos, top, Source).
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'$execute_command'(G, V, Pos, Option, Source) :-
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'$continue_with_command'(Option, V, Pos, G, Source).
|
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%
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|
% This command is very different depending on the language mode we are in.
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%
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% ISO only wants directives in files
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% SICStus accepts everything in files
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|
% YAP accepts everything everywhere
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|
%
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'$process_directive'(G, top, M, VL, Pos) :-
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'$access_yap_flags'(8, 0), !, % YAP mode, go in and do it,
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'$process_directive'(G, consult, M, VL, Pos).
|
|
'$process_directive'(G, top, _, _, _) :- !,
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'$do_error'(context_error((:- G),clause),query).
|
|
%
|
|
% allow modules
|
|
%
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|
'$process_directive'(M:G, Mode, _, VL, Pos) :- !,
|
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'$process_directive'(G, Mode, M, VL, Pos).
|
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%
|
|
% default case
|
|
%
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'$process_directive'(Gs, Mode, M, VL, Pos) :-
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'$all_directives'(Gs), !,
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'$exec_directives'(Gs, Mode, M, VL, Pos).
|
|
|
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%
|
|
% ISO does not allow goals (use initialization).
|
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%
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'$process_directive'(D, _, M, VL, Pos) :-
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'$access_yap_flags'(8, 1), !, % ISO Prolog mode, go in and do it,
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'$do_error'(context_error((:- M:D),query),directive).
|
|
%
|
|
% but YAP and SICStus does.
|
|
%
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|
'$process_directive'(G, _, M, VL, Pos) :-
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( '$execute'(M:G) -> true ; format(user_error,':- ~w:~w failed.~n',[M,G]) ).
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|
|
|
'$continue_with_command'(Where,V,'$stream_position'(C,_P,A1,A2,A3),'$source_location'(_F,L):G,Source) :- !,
|
|
'$continue_with_command'(Where,V,'$stream_position'(C,L,A1,A2,A3),G,Source).
|
|
'$continue_with_command'(reconsult,V,Pos,G,Source) :-
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'$go_compile_clause'(G,V,Pos,5,Source),
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fail.
|
|
'$continue_with_command'(consult,V,Pos,G,Source) :-
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'$go_compile_clause'(G,V,Pos,13,Source),
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fail.
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|
'$continue_with_command'(top,V,_,G,_) :-
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'$query'(G,V).
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%
|
|
% not 100% compatible with SICStus Prolog, as SICStus Prolog would put
|
|
% module prefixes all over the place, although unnecessarily so.
|
|
%
|
|
'$go_compile_clause'(G,V,Pos,N,Source) :-
|
|
'$current_module'(Mod),
|
|
'$go_compile_clause'(G,V,Pos,N,Mod,Mod,Source).
|
|
|
|
'$go_compile_clause'(G,_,_,_,_,_,Source) :-
|
|
var(G), !,
|
|
'$do_error'(instantiation_error,assert(Source)).
|
|
'$go_compile_clause'((G:-_),_,_,_,_,_,Source) :-
|
|
var(G), !,
|
|
'$do_error'(instantiation_error,assert(Source)).
|
|
'$go_compile_clause'(M:G,V,Pos,N,_,_,Source) :- !,
|
|
'$go_compile_clause'(G,V,Pos,N,M,M,Source).
|
|
'$go_compile_clause'((M:H :- B),V,Pos,N,_,BodyMod,Source) :- !,
|
|
'$go_compile_clause'((H :- B),V,Pos,N,M,BodyMod,Source).
|
|
'$go_compile_clause'(G,V,Pos,N,HeadMod,BodyMod,Source) :- !,
|
|
'$prepare_term'(G, V, Pos, G0, G1, BodyMod, HeadMod, Source),
|
|
'$$compile'(G1, G0, N, HeadMod).
|
|
|
|
'$prepare_term'(G, V, Pos, G0, G1, BodyMod, SourceMod, Source) :-
|
|
(
|
|
get_value('$syntaxcheckflag',on)
|
|
->
|
|
'$check_term'(Source, G, V, Pos, BodyMod)
|
|
;
|
|
true
|
|
),
|
|
'$precompile_term'(G, G0, G1, BodyMod, SourceMod).
|
|
|
|
% process an input clause
|
|
'$$compile'(G, G0, L, Mod) :-
|
|
'$head_and_body'(G,H,_),
|
|
'$flags'(H, Mod, Fl, Fl),
|
|
is(NFl, /\, Fl, 0x00002000),
|
|
(
|
|
NFl \= 0
|
|
->
|
|
'$assertz_dynamic'(L,G,G0,Mod)
|
|
;
|
|
'$nb_getval'('$assert_all',on,fail)
|
|
->
|
|
functor(H,N,A),
|
|
'$dynamic'(N/A,Mod),
|
|
'$assertz_dynamic'(L,G,G0,Mod)
|
|
;
|
|
'$not_imported'(H, Mod),
|
|
'$compile'(G, L, G0, Mod)
|
|
).
|
|
|
|
%
|
|
% check if current module redefines an imported predicate.
|
|
% and remove import.
|
|
%
|
|
'$not_imported'(H, Mod) :-
|
|
recorded('$import','$import'(NM,Mod,NH,H,_,_),R),
|
|
NM \= Mod,
|
|
functor(NH,N,Ar),
|
|
print_message(warning,redefine_imported(Mod,NM,N/Ar)),
|
|
erase(R),
|
|
fail.
|
|
'$not_imported'(_, _).
|
|
|
|
|
|
'$check_if_reconsulted'(N,A) :-
|
|
once(recorded('$reconsulted',N/A,_)),
|
|
recorded('$reconsulted',X,_),
|
|
( X = N/A , !;
|
|
X = '$', !, fail;
|
|
fail
|
|
).
|
|
|
|
'$inform_as_reconsulted'(N,A) :-
|
|
recorda('$reconsulted',N/A,_).
|
|
|
|
'$clear_reconsulting' :-
|
|
recorded('$reconsulted',X,Ref),
|
|
erase(Ref),
|
|
X == '$', !,
|
|
( recorded('$reconsulting',_,R) -> erase(R) ).
|
|
|
|
'$prompt_alternatives_on'(determinism).
|
|
|
|
/* Executing a query */
|
|
|
|
'$query'(end_of_file,_).
|
|
|
|
'$query'(G,[]) :-
|
|
'$prompt_alternatives_on'(OPT),
|
|
( OPT = groundness ; OPT = determinism), !,
|
|
'$yes_no'(G,(?-)).
|
|
'$query'(G,V) :-
|
|
(
|
|
'$current_choice_point'(CP),
|
|
'$current_module'(M),
|
|
'$user_call'(G, M),
|
|
'$current_choice_point'(NCP),
|
|
'$delayed_goals'(G, V, NV, LGs, DCP),
|
|
'$write_answer'(NV, LGs, Written),
|
|
'$write_query_answer_true'(Written),
|
|
(
|
|
'$prompt_alternatives_on'(determinism), CP == NCP, DCP = 0
|
|
->
|
|
format(user_error, '.~n', []),
|
|
!
|
|
;
|
|
'$another',
|
|
!
|
|
),
|
|
fail
|
|
;
|
|
'$out_neg_answer'
|
|
).
|
|
|
|
'$yes_no'(G,C) :-
|
|
'$current_module'(M),
|
|
'$do_yes_no'(G,M),
|
|
'$delayed_goals'(G, [], NV, LGs, _),
|
|
'$write_answer'(NV, LGs, Written),
|
|
( Written = [] ->
|
|
!,'$present_answer'(C, true)
|
|
;
|
|
'$another', !
|
|
),
|
|
fail.
|
|
'$yes_no'(_,_) :-
|
|
'$out_neg_answer'.
|
|
|
|
'$add_env_and_fail' :- fail.
|
|
|
|
%
|
|
% *-> at this point would require compiler support, which does not exist.
|
|
%
|
|
'$delayed_goals'(G, V, NV, LGs, NCP) :-
|
|
(
|
|
CP is '$last_choice_pt',
|
|
'$current_choice_point'(NCP1),
|
|
'$attributes':delayed_goals(G, V, NV, LGs),
|
|
'$current_choice_point'(NCP2),
|
|
'$clean_ifcp'(CP),
|
|
NCP is NCP2-NCP1
|
|
;
|
|
copy_term_nat(V, NV),
|
|
LGs = [],
|
|
% term_factorized(V, NV, LGs),
|
|
NCP = 0
|
|
).
|
|
|
|
'$out_neg_answer' :-
|
|
( '$undefined'(print_message(_,_),prolog) ->
|
|
'$present_answer'(user_error,'false.~n')
|
|
;
|
|
print_message(help,false)
|
|
),
|
|
fail.
|
|
|
|
'$do_yes_no'([X|L], M) :-
|
|
!,
|
|
'$csult'([X|L], M).
|
|
'$do_yes_no'(G, M) :-
|
|
'$user_call'(G, M).
|
|
|
|
'$write_query_answer_true'([]) :- !,
|
|
format(user_error,'true',[]).
|
|
'$write_query_answer_true'(_).
|
|
|
|
|
|
%
|
|
% present_answer has three components. First it flushes the streams,
|
|
% then it presents the goals, and last it shows any goals frozen on
|
|
% the arguments.
|
|
%
|
|
'$present_answer'(_,_):-
|
|
flush_output,
|
|
fail.
|
|
'$present_answer'((?-), Answ) :-
|
|
'$swi_current_prolog_flag'(break_level, BL ),
|
|
( BL \= 0 -> format(user_error, '[~p] ',[BL]) ;
|
|
true ),
|
|
( recorded('$print_options','$toplevel'(Opts),_) ->
|
|
write_term(user_error,Answ,Opts) ;
|
|
format(user_error,'~w',[Answ])
|
|
),
|
|
format(user_error,'.~n', []).
|
|
|
|
'$another' :-
|
|
format(user_error,' ? ',[]),
|
|
get0(user_input,C),
|
|
'$do_another'(C).
|
|
|
|
'$do_another'(C) :-
|
|
( C== 0'; -> skip(user_input,10), %'
|
|
% '$add_nl_outside_console',
|
|
fail
|
|
;
|
|
C== 10 -> '$add_nl_outside_console',
|
|
( '$undefined'(print_message(_,_),prolog) ->
|
|
format(user_error,'yes~n', [])
|
|
;
|
|
print_message(help,yes)
|
|
)
|
|
;
|
|
C== 13 ->
|
|
get0(user_input,NC),
|
|
'$do_another'(NC)
|
|
;
|
|
C== -1 -> halt
|
|
;
|
|
skip(user_input,10), '$ask_again_for_another'
|
|
).
|
|
|
|
%'$add_nl_outside_console' :-
|
|
% '$is_same_tty'(user_input, user_error), !.
|
|
'$add_nl_outside_console' :-
|
|
format(user_error,'~n',[]).
|
|
|
|
'$ask_again_for_another' :-
|
|
format(user_error,'Action (\";\" for more choices, <return> for exit)', []),
|
|
'$another'.
|
|
|
|
'$write_answer'(_,_,_) :-
|
|
flush_output,
|
|
fail.
|
|
'$write_answer'(Vs, LBlk, FLAnsw) :-
|
|
'$purge_dontcares'(Vs,IVs),
|
|
'$sort'(IVs, NVs),
|
|
'$prep_answer_var_by_var'(NVs, LAnsw, LBlk),
|
|
'$name_vars_in_goals'(LAnsw, Vs, NLAnsw),
|
|
'$write_vars_and_goals'(NLAnsw, first, FLAnsw).
|
|
|
|
'$purge_dontcares'([],[]).
|
|
'$purge_dontcares'([Name=_|Vs],NVs) :-
|
|
atom_codes(Name, [C|_]), C is "_", !,
|
|
'$purge_dontcares'(Vs,NVs).
|
|
'$purge_dontcares'([V|Vs],[V|NVs]) :-
|
|
'$purge_dontcares'(Vs,NVs).
|
|
|
|
|
|
'$prep_answer_var_by_var'([], L, L).
|
|
'$prep_answer_var_by_var'([Name=Value|L], LF, L0) :-
|
|
'$delete_identical_answers'(L, Value, NL, Names),
|
|
'$prep_answer_var'([Name|Names], Value, LF, LI),
|
|
'$prep_answer_var_by_var'(NL, LI, L0).
|
|
|
|
% fetch all cases that have the same solution.
|
|
'$delete_identical_answers'([], _, [], []).
|
|
'$delete_identical_answers'([(Name=Value)|L], Value0, FL, [Name|Names]) :-
|
|
Value == Value0, !,
|
|
'$delete_identical_answers'(L, Value0, FL, Names).
|
|
'$delete_identical_answers'([VV|L], Value0, [VV|FL], Names) :-
|
|
'$delete_identical_answers'(L, Value0, FL, Names).
|
|
|
|
% now create a list of pairs that will look like goals.
|
|
'$prep_answer_var'(Names, Value, LF, L0) :- var(Value), !,
|
|
'$prep_answer_unbound_var'(Names, LF, L0).
|
|
'$prep_answer_var'(Names, Value, [nonvar(Names,Value)|L0], L0).
|
|
|
|
% ignore unbound variables
|
|
'$prep_answer_unbound_var'([_], L, L) :- !.
|
|
'$prep_answer_unbound_var'(Names, [var(Names)|L0], L0).
|
|
|
|
'$gen_name_string'(I,L,[C|L]) :- I < 26, !, C is I+65.
|
|
'$gen_name_string'(I,L0,LF) :-
|
|
I1 is I mod 26,
|
|
I2 is I // 26,
|
|
C is I1+65,
|
|
'$gen_name_string'(I2,[C|L0],LF).
|
|
|
|
'$write_vars_and_goals'([], _, []).
|
|
'$write_vars_and_goals'([nl,G1|LG], First, NG) :- !,
|
|
nl(user_error),
|
|
'$write_goal_output'(G1, First, NG, Next, IG),
|
|
'$write_vars_and_goals'(LG, Next, IG).
|
|
'$write_vars_and_goals'([G1|LG], First, NG) :-
|
|
'$write_goal_output'(G1, First, NG, Next, IG),
|
|
'$write_vars_and_goals'(LG, Next, IG).
|
|
|
|
'$goal_to_string'(Format, G, String) :-
|
|
format(codes(String),Format,G).
|
|
|
|
'$write_goal_output'(var([V|VL]), First, [var([V|VL])|L], next, L) :- !,
|
|
( First = first -> true ; format(user_error,',~n',[]) ),
|
|
format(user_error,'~a',[V]),
|
|
'$write_output_vars'(VL).
|
|
'$write_goal_output'(nonvar([V|VL],B), First, [nonvar([V|VL],B)|L], next, L) :- !,
|
|
( First = first -> true ; format(user_error,',~n',[]) ),
|
|
format(user_error,'~a',[V]),
|
|
'$write_output_vars'(VL),
|
|
format(user_error,' = ', []),
|
|
( recorded('$print_options','$toplevel'(Opts),_) ->
|
|
write_term(user_error,B,[priority(699)|Opts]) ;
|
|
write_term(user_error,B,[priority(699)])
|
|
).
|
|
'$write_goal_output'(nl, First, NG, First, NG) :- !,
|
|
format(user_error,'~n',[]).
|
|
'$write_goal_output'(Format-G, First, NG, Next, IG) :- !,
|
|
G = [_|_], !,
|
|
% dump on string first so that we can check whether we actually
|
|
% had any output from the solver.
|
|
'$goal_to_string'(Format, G, String),
|
|
( String == [] ->
|
|
% we didn't
|
|
IG = NG, First = Next
|
|
;
|
|
% we did
|
|
( First = first -> true ; format(user_error,',~n',[]) ),
|
|
format(user_error, '~s', [String]),
|
|
NG = [G|IG]
|
|
).
|
|
'$write_goal_output'(_-G, First, [G|NG], next, NG) :- !,
|
|
( First = first -> true ; format(user_error,',~n',[]) ),
|
|
( recorded('$print_options','$toplevel'(Opts),_) ->
|
|
write_term(user_error,G,Opts) ;
|
|
format(user_error,'~w',[G])
|
|
).
|
|
'$write_goal_output'(_M:G, First, [G|NG], next, NG) :- !,
|
|
( First = first -> true ; format(user_error,',~n',[]) ),
|
|
( recorded('$print_options','$toplevel'(Opts),_) ->
|
|
write_term(user_error,G,Opts) ;
|
|
format(user_error,'~w',[G])
|
|
).
|
|
'$write_goal_output'(G, First, [M:G|NG], next, NG) :-
|
|
'$current_module'(M),
|
|
( First = first -> true ; format(user_error,',~n',[]) ),
|
|
( recorded('$print_options','$toplevel'(Opts),_) ->
|
|
write_term(user_error,G,Opts) ;
|
|
format(user_error,'~w',[G])
|
|
).
|
|
|
|
'$name_vars_in_goals'(G, VL0, G) :-
|
|
'$name_well_known_vars'(VL0),
|
|
'$variables_in_term'(G, [], GVL),
|
|
'$name_vars_in_goals1'(GVL, 0, _).
|
|
|
|
'$name_well_known_vars'([]).
|
|
'$name_well_known_vars'([Name=V|NVL0]) :-
|
|
var(V), !,
|
|
V = '$VAR'(Name),
|
|
'$name_well_known_vars'(NVL0).
|
|
'$name_well_known_vars'([_|NVL0]) :-
|
|
'$name_well_known_vars'(NVL0).
|
|
|
|
'$name_vars_in_goals1'([], I, I).
|
|
'$name_vars_in_goals1'(['$VAR'(Name)|NGVL], I0, IF) :-
|
|
I is I0+1,
|
|
'$gen_name_string'(I0,[],SName), !,
|
|
atom_codes(Name, [95|SName]),
|
|
'$name_vars_in_goals1'(NGVL, I, IF).
|
|
'$name_vars_in_goals1'([NV|NGVL], I0, IF) :-
|
|
nonvar(NV),
|
|
'$name_vars_in_goals1'(NGVL, I0, IF).
|
|
|
|
'$write_output_vars'([]).
|
|
'$write_output_vars'([V|VL]) :-
|
|
format(user_error,' = ~s',[V]),
|
|
'$write_output_vars'(VL).
|
|
|
|
call(G) :- '$execute'(G).
|
|
|
|
incore(G) :- '$execute'(G).
|
|
|
|
%
|
|
% standard meta-call, called if $execute could not do everything.
|
|
%
|
|
'$meta_call'(G, M) :-
|
|
'$current_choice_point'(CP),
|
|
'$call'(G, CP, G, M).
|
|
|
|
'$user_call'(G, M) :-
|
|
( '$$save_by'(CP),
|
|
'$enable_debugging',
|
|
'$call'(G, CP, M:G, M),
|
|
'$$save_by'(CP2),
|
|
(CP == CP2 -> ! ; ( true ; '$enable_debugging', fail ) ),
|
|
'$disable_debugging'
|
|
;
|
|
'$disable_debugging',
|
|
fail
|
|
).
|
|
|
|
'$enable_debugging' :-
|
|
'$swi_current_prolog_flag'(debug, false), !.
|
|
'$enable_debugging' :-
|
|
'$nb_getval'('$trace', on, fail), !,
|
|
'$creep'.
|
|
'$enable_debugging'.
|
|
|
|
'$disable_debugging' :-
|
|
'$stop_creeping'.
|
|
|
|
|
|
','(X,Y) :-
|
|
yap_hacks:env_choice_point(CP),
|
|
'$current_module'(M),
|
|
'$call'(X,CP,(X,Y),M),
|
|
'$call'(Y,CP,(X,Y),M).
|
|
';'((X->A),Y) :- !,
|
|
yap_hacks:env_choice_point(CP),
|
|
'$current_module'(M),
|
|
( '$execute'(X)
|
|
->
|
|
'$call'(A,CP,(X->A;Y),M)
|
|
;
|
|
'$call'(Y,CP,(X->A;Y),M)
|
|
).
|
|
';'((X*->A),Y) :- !,
|
|
yap_hacks:env_choice_point(CP),
|
|
'$current_module'(M),
|
|
(
|
|
yap_hacks:current_choice_point(DCP),
|
|
'$execute'(X),
|
|
yap_hacks:cut_at(DCP),
|
|
'$call'(A,CP,((X*->A),Y),M)
|
|
;
|
|
'$call'(Y,CP,((X*->A),Y),M)
|
|
).
|
|
';'(X,Y) :-
|
|
yap_hacks:env_choice_point(CP),
|
|
'$current_module'(M),
|
|
( '$call'(X,CP,(X;Y),M) ; '$call'(Y,CP,(X;Y),M) ).
|
|
'|'(X,Y) :-
|
|
yap_hacks:env_choice_point(CP),
|
|
'$current_module'(M),
|
|
( '$call'(X,CP,(X|Y),M) ; '$call'(Y,CP,(X|Y),M) ).
|
|
'->'(X,Y) :-
|
|
yap_hacks:env_choice_point(CP),
|
|
'$current_module'(M),
|
|
( '$call'(X,CP,(X->Y),M) -> '$call'(Y,CP,(X->Y),M) ).
|
|
'*->'(X,Y) :-
|
|
yap_hacks:env_choice_point(CP),
|
|
'$current_module'(M),
|
|
( '$call'(X,CP,(X*->Y),M), '$call'(Y,CP,(X*->Y),M) ).
|
|
\+(G) :- \+ '$execute'(G).
|
|
not(G) :- \+ '$execute'(G).
|
|
|
|
'$cut_by'(CP) :- '$$cut_by'(CP).
|
|
|
|
%
|
|
% do it in ISO mode.
|
|
%
|
|
'$meta_call'(G,_ISO,M) :-
|
|
'$iso_check_goal'(G,G),
|
|
'$current_choice_point'(CP),
|
|
'$call'(G, CP, G, M).
|
|
|
|
'$meta_call'(G, CP, G0, M) :-
|
|
'$call'(G, CP, G0, M).
|
|
|
|
'$call'(G, CP, G0, _, M) :- /* iso version */
|
|
'$iso_check_goal'(G,G0),
|
|
'$call'(G, CP, G0, M).
|
|
|
|
|
|
'$call'(M:_,_,G0,_) :- var(M), !,
|
|
'$do_error'(instantiation_error,call(G0)).
|
|
'$call'(M:G,CP,G0,_) :- !,
|
|
'$call'(G,CP,G0,M).
|
|
'$call'((X,Y),CP,G0,M) :- !,
|
|
'$call'(X,CP,G0,M),
|
|
'$call'(Y,CP,G0,M).
|
|
'$call'((X->Y),CP,G0,M) :- !,
|
|
(
|
|
'$call'(X,CP,G0,M)
|
|
->
|
|
'$call'(Y,CP,G0,M)
|
|
).
|
|
'$call'((X*->Y),CP,G0,M) :- !,
|
|
'$call'(X,CP,G0,M),
|
|
'$call'(Y,CP,G0,M).
|
|
'$call'((X->Y; Z),CP,G0,M) :- !,
|
|
(
|
|
'$call'(X,CP,G0,M)
|
|
->
|
|
'$call'(Y,CP,G0,M)
|
|
;
|
|
'$call'(Z,CP,G0,M)
|
|
).
|
|
'$call'((X*->Y; Z),CP,G0,M) :- !,
|
|
(
|
|
'$current_choice_point'(DCP),
|
|
'$call'(X,CP,G0,M),
|
|
yap_hacks:cut_at(DCP),
|
|
'$call'(Y,CP,G0,M)
|
|
;
|
|
'$call'(Z,CP,G0,M)
|
|
).
|
|
'$call'((A;B),CP,G0,M) :- !,
|
|
(
|
|
'$call'(A,CP,G0,M)
|
|
;
|
|
'$call'(B,CP,G0,M)
|
|
).
|
|
'$call'((X->Y| Z),CP,G0,M) :- !,
|
|
(
|
|
'$call'(X,CP,G0,M)
|
|
->
|
|
'$call'(Y,CP,G0,M)
|
|
;
|
|
'$call'(Z,CP,G0,M)
|
|
).
|
|
'$call'((X*->Y| Z),CP,G0,M) :- !,
|
|
(
|
|
'$current_choice_point'(DCP),
|
|
'$call'(X,CP,G0,M),
|
|
yap_hacks:cut_at(DCP),
|
|
'$call'(Y,CP,G0,M)
|
|
;
|
|
'$call'(Z,CP,G0,M)
|
|
).
|
|
'$call'((A|B),CP, G0,M) :- !,
|
|
(
|
|
'$call'(A,CP,G0,M)
|
|
;
|
|
'$call'(B,CP,G0,M)
|
|
).
|
|
'$call'(\+ X, _CP, _G0, M) :- !,
|
|
'$current_choice_point'(CP),
|
|
\+ '$call'(X,CP,G0,M).
|
|
'$call'(not(X), _CP, _G0, M) :- !,
|
|
\+ '$call'(X,CP,G0,M).
|
|
'$call'(!, CP, _,_) :- !,
|
|
'$$cut_by'(CP).
|
|
'$call'([A|B], _, _, M) :- !,
|
|
'$csult'([A|B], M).
|
|
'$call'(G, CP, G0, CurMod) :-
|
|
( '$is_expand_goal_or_meta_predicate'(G,CurMod) ->
|
|
(
|
|
'$do_goal_expansion'(G, CurMod, NG) ->
|
|
'$call'(NG, CP, G0,CurMod)
|
|
;
|
|
% repeat other code.
|
|
'$is_metapredicate'(G,CurMod) ->
|
|
(
|
|
'$meta_expansion'(G,CurMod,CurMod,CurMod,NG,[]) ->
|
|
'$execute0'(NG, CurMod)
|
|
;
|
|
'$execute0'(G, CurMod)
|
|
)
|
|
;
|
|
'$execute0'(G, CurMod)
|
|
)
|
|
;
|
|
'$execute0'(G, CurMod)
|
|
).
|
|
|
|
'$check_callable'(V,G) :- var(V), !,
|
|
'$do_error'(instantiation_error,G).
|
|
'$check_callable'(M:_G1,G) :- var(M), !,
|
|
'$do_error'(instantiation_error,G).
|
|
'$check_callable'(_:G1,G) :- !,
|
|
'$check_callable'(G1,G).
|
|
'$check_callable'(A,G) :- number(A), !,
|
|
'$do_error'(type_error(callable,A),G).
|
|
'$check_callable'(R,G) :- db_reference(R), !,
|
|
'$do_error'(type_error(callable,R),G).
|
|
'$check_callable'(_,_).
|
|
|
|
% Called by the abstract machine, if no clauses exist for a predicate
|
|
'$undefp'([M|G]) :-
|
|
'$find_goal_definition'(M, G, NM, NG),
|
|
'$execute0'(NG, NM).
|
|
|
|
'$find_goal_definition'(M, G, NM, NG) :-
|
|
% make sure we do not loop on undefined predicates
|
|
% for undefined_predicates.
|
|
'$enter_undefp',
|
|
(
|
|
'$get_undefined_pred'(G, M, Goal, NM)
|
|
->
|
|
'$exit_undefp',
|
|
Goal \= fail,
|
|
'$complete_goal'(M, Goal, NM, G, NG)
|
|
;
|
|
'$find_undefp_handler'(G, M),
|
|
NG = G, NM = M
|
|
).
|
|
|
|
'$complete_goal'(M, G, CurMod, G0, NG) :-
|
|
(
|
|
'$is_metapredicate'(G,CurMod)
|
|
->
|
|
'$meta_expansion'(G, CurMod, M, M, NG,[])
|
|
;
|
|
NG = G
|
|
).
|
|
|
|
'$find_undefp_handler'(G,M,NG,user) :-
|
|
functor(G, Na, Ar),
|
|
user:exception(undefined_predicate,M:Na/Ar,Action), !,
|
|
'$exit_undefp',
|
|
(
|
|
Action == fail
|
|
->
|
|
NG = fail
|
|
;
|
|
Action == retry
|
|
->
|
|
NG = G
|
|
;
|
|
Action == error
|
|
->
|
|
'$unknown_error'(M:G)
|
|
;
|
|
'$do_error'(type_error(atom, Action),M:G)
|
|
).
|
|
|
|
'$find_undefp_handler'(G,M) :-
|
|
'$exit_undefp',
|
|
'$swi_current_prolog_flag'(M:unknown, Action),
|
|
(
|
|
Action == fail
|
|
->
|
|
fail
|
|
;
|
|
Action == warning
|
|
->
|
|
'$unknown_warning'(M:G),
|
|
fail
|
|
;
|
|
'$unknown_error'(M:G)
|
|
).
|
|
|
|
'$silent_bootstrap'(F) :-
|
|
'$init_globals',
|
|
nb_setval('$if_level',0),
|
|
'$swi_current_prolog_flag'(verbose_load, OldSilent),
|
|
'$swi_set_prolog_flag'(verbose_load, silent),
|
|
bootstrap(F),
|
|
% -p option must be processed after initializing the system
|
|
'$swi_set_prolog_flag'(verbose_load, OldSilent).
|
|
|
|
bootstrap(F) :-
|
|
% '$open'(F, '$csult', Stream, 0, 0, F),
|
|
% '$file_name'(Stream,File),
|
|
open(F, read, Stream),
|
|
stream_property(Stream, file_name(File)),
|
|
'$start_consult'(consult, File, LC),
|
|
file_directory_name(File, Dir),
|
|
working_directory(OldD, Dir),
|
|
(
|
|
'$swi_current_prolog_flag'(verbose_load, silent)
|
|
->
|
|
true
|
|
;
|
|
H0 is heapused, '$cputime'(T0,_),
|
|
format(user_error, '~*|% consulting ~w...~n', [LC,F])
|
|
),
|
|
'$loop'(Stream,consult),
|
|
working_directory(_, OldD),
|
|
'$current_module'(_, prolog),
|
|
'$end_consult',
|
|
(
|
|
'$swi_current_prolog_flag'(verbose_load, silent)
|
|
->
|
|
true
|
|
;
|
|
H is heapused-H0, '$cputime'(TF,_), T is TF-T0,
|
|
format(user_error, '~*|% ~w consulted ~w bytes in ~d msecs~n', [LC,F,H,T])
|
|
),
|
|
!,
|
|
close(Stream).
|
|
|
|
'$loop'(Stream,exo) :-
|
|
prolog_flag(agc_margin,Old,0),
|
|
prompt1('| '), prompt(_,'| '),
|
|
'$current_module'(OldModule),
|
|
repeat,
|
|
'$system_catch'(dbload_from_stream(Stream, OldModule, exo), '$db_load', Error,
|
|
user:'$LoopError'(Error, Status)),
|
|
prolog_flag(agc_margin,_,Old),
|
|
!.
|
|
'$loop'(Stream,db) :-
|
|
prolog_flag(agc_margin,Old,0),
|
|
prompt1('| '), prompt(_,'| '),
|
|
'$current_module'(OldModule),
|
|
repeat,
|
|
'$system_catch'(dbload_from_stream(Stream, OldModule, db), '$db_load', Error,
|
|
user:'$LoopError'(Error, Status)),
|
|
prolog_flag(agc_margin,_,Old),
|
|
!.
|
|
'$loop'(Stream,Status) :-
|
|
repeat,
|
|
prompt1('| '), prompt(_,'| '),
|
|
'$current_module'(OldModule),
|
|
'$system_catch'('$enter_command'(Stream,OldModule,Status), OldModule, Error,
|
|
user:'$LoopError'(Error, Status)),
|
|
!.
|
|
|
|
'$enter_command'(Stream,Mod,Status) :-
|
|
read_clause(Stream, Command, [variable_names(Vars), term_position(Pos), syntax_errors(dec10) ]),
|
|
'$command'(Command,Vars,Pos,Status).
|
|
|
|
'$abort_loop'(Stream) :-
|
|
'$do_error'(permission_error(input,closed_stream,Stream), loop).
|
|
|
|
|
|
/* General purpose predicates */
|
|
|
|
'$head_and_body'((H:-B),H,B) :- !.
|
|
'$head_and_body'(H,H,true).
|
|
|
|
%
|
|
% split head and body, generate an error if body is unbound.
|
|
%
|
|
'$check_head_and_body'((H:-B),H,B,P) :- !,
|
|
'$check_head'(H,P).
|
|
'$check_head_and_body'(H,H,true,P) :-
|
|
'$check_head'(H,P).
|
|
|
|
'$check_head'(H,P) :- var(H), !,
|
|
'$do_error'(instantiation_error,P).
|
|
'$check_head'(H,P) :- number(H), !,
|
|
'$do_error'(type_error(callable,H),P).
|
|
'$check_head'(H,P) :- db_reference(H), !,
|
|
'$do_error'(type_error(callable,H),P).
|
|
'$check_head'(_,_).
|
|
|
|
% term expansion
|
|
%
|
|
% return two arguments: Expanded0 is the term after "USER" expansion.
|
|
% Expanded is the final expanded term.
|
|
%
|
|
'$precompile_term'(Term, Expanded0, Expanded, BodyMod, SourceMod) :-
|
|
%format('[ ~w~n',[Term]),
|
|
'$module_expansion'(Term, Expanded0, ExpandedI, BodyMod, SourceMod), !,
|
|
%format(' -> ~w~n',[Expanded0]),
|
|
(
|
|
'$access_yap_flags'(9,1) /* strict_iso on */
|
|
->
|
|
Expanded = ExpandedI,
|
|
'$check_iso_strict_clause'(Expanded0)
|
|
;
|
|
'$expand_array_accesses_in_term'(ExpandedI,Expanded)
|
|
).
|
|
'$precompile_term'(Term, Term, Term, _, _).
|
|
|
|
|
|
expand_term(Term,Expanded) :-
|
|
( '$do_term_expansion'(Term,Expanded)
|
|
->
|
|
true
|
|
;
|
|
'$expand_term_grammar'(Term,Expanded)
|
|
).
|
|
|
|
%
|
|
% Grammar Rules expansion
|
|
%
|
|
'$expand_term_grammar'((A-->B), C) :-
|
|
'$translate_rule'((A-->B),C), !.
|
|
'$expand_term_grammar'(A, A).
|
|
|
|
%
|
|
% Arithmetic expansion
|
|
%
|
|
'$expand_array_accesses_in_term'(Expanded0,ExpandedF) :-
|
|
'$array_refs_compiled',
|
|
'$arrays':'$c_arrays'(Expanded0,ExpandedF), !.
|
|
'$expand_array_accesses_in_term'(Expanded,Expanded).
|
|
|
|
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
% catch/throw implementation
|
|
|
|
% at each catch point I need to know:
|
|
% what is ball;
|
|
% where was the previous catch
|
|
catch(G, C, A) :-
|
|
'$catch'(C,A,_),
|
|
'$$save_by'(CP0),
|
|
'$execute'(G),
|
|
'$$save_by'(CP1),
|
|
(CP0 == CP1 -> !; true ).
|
|
|
|
% makes sure we have an environment.
|
|
'$true'.
|
|
|
|
|
|
% system_catch is like catch, but it avoids the overhead of a full
|
|
% meta-call by calling '$execute0' instead of $execute.
|
|
% This way it
|
|
% also avoids module preprocessing and goal_expansion
|
|
%
|
|
'$system_catch'(G, M, C, A) :-
|
|
% check current trail
|
|
'$catch'(C,A,_),
|
|
'$$save_by'(CP0),
|
|
'$execute_nonstop'(G, M),
|
|
'$$save_by'(CP1),
|
|
(CP0 == CP1 -> !; true ).
|
|
|
|
%
|
|
% throw has to be *exactly* after system catch!
|
|
%
|
|
throw(_Ball) :-
|
|
% use existing ball
|
|
'$get_exception'(Ball),
|
|
!,
|
|
'$jump_env_and_store_ball'(Ball).
|
|
throw(Ball) :-
|
|
( var(Ball) ->
|
|
'$do_error'(instantiation_error,throw(Ball))
|
|
;
|
|
% get current jump point
|
|
'$jump_env_and_store_ball'(Ball)
|
|
).
|
|
|
|
|
|
% just create a choice-point
|
|
'$catch'(_,_,_).
|
|
'$catch'(_,_,_) :- fail.
|
|
|
|
'$handle_throw'(_, _, _).
|
|
'$handle_throw'(C, A, _Ball) :-
|
|
'$reset_exception'(Ball),
|
|
% reset info
|
|
(catch_ball(Ball, C) ->
|
|
'$execute'(A)
|
|
;
|
|
throw(Ball)
|
|
).
|
|
|
|
catch_ball(Abort, _) :- Abort == '$abort', !, fail.
|
|
% system defined throws should be ignored by used, unless the
|
|
% user is hacking away.
|
|
catch_ball(Ball, V) :-
|
|
var(V),
|
|
nonvar(Ball),
|
|
Ball = error(Type,_), % internal error ??
|
|
functor(Type, Name, _),
|
|
atom_codes(Name, [0'$|_]), %'0
|
|
!, fail.
|
|
catch_ball(C, C).
|
|
|
|
'$run_toplevel_hooks' :-
|
|
'$swi_current_prolog_flag'(break_level, 0 ),
|
|
recorded('$toplevel_hooks',H,_),
|
|
H \= fail, !,
|
|
( call(user:H1) -> true ; true).
|
|
'$run_toplevel_hooks'.
|
|
|
|
'$run_at_thread_start' :-
|
|
recorded('$thread_initialization',M:D,_),
|
|
'$meta_call'(D, M),
|
|
fail.
|
|
'$run_at_thread_start'.
|
|
|
|
|
|
|
|
|