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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-2014 *
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* *
**************************************************************************
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* *
* File: boot.yap *
* Last rev: 8/2/88 *
* mods: *
* commen ts: boot file for Prolog *
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* *
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*************************************************************************/
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/**
@file boot.yap
@brief YAP bootstrap
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@defgroup YAPControl Control Predicates
@ingroup builtins
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@{
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*/
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system_module(_Mod, _SysExps, _Decls).
% new_system_module(Mod).
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use_system_module(_Module, _SysExps).
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private(_).
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%
% boootstrap predicates.
%
:- system_module( '$_boot', [
bootstrap/1,
call/1,
catch/3,
catch_ball/2,
expand_term/2,
import_system_module/2,
incore/1,
(not)/1,
repeat/0,
throw/1,
true/0], ['$$compile'/4,
'$call'/4,
'$catch'/3,
'$check_callable'/2,
'$check_head_and_body'/4,
'$check_if_reconsulted'/2,
'$clear_reconsulting'/0,
'$command'/4,
'$cut_by'/1,
'$disable_debugging'/0,
'$do_live'/0,
'$'/0,
'$find_goal_definition'/4,
'$head_and_body'/3,
'$inform_as_reconsulted'/2,
'$init_system'/0,
'$init_win_graphics'/0,
'$live'/0,
'$loop'/2,
'$meta_call'/2,
'$prompt_alternatives_on'/1,
'$run_at_thread_start'/0,
'$system_catch'/4,
'$undefp'/1,
'$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,
'$sv_warning'/2]).
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:- use_system_module( '$_consult', ['$csult'/2]).
:- use_system_module( '$_control', ['$run_atom_goal'/1]).
:- use_system_module( '$_directives', ['$all_directives'/1,
'$exec_directives'/5]).
:- use_system_module( '$_errors', ['$do_error'/2]).
:- use_system_module( '$_grammar', ['$translate_rule'/2]).
:- use_system_module( '$_modules', ['$get_undefined_pred'/4,
'$meta_expansion'/6,
'$module_expansion'/6]).
:- use_system_module( '$_preddecls', ['$dynamic'/2]).
:- use_system_module( '$_preds', ['$assert_static'/5,
'$assertz_dynamic'/4,
'$init_preds'/0,
'$unknown_error'/1,
'$unknown_warning'/1]).
:- use_system_module( '$_qly', ['$init_state'/0]).
:- use_system_module( '$_strict_iso', ['$check_iso_strict_clause'/1,
'$iso_check_goal'/2]).
% be careful here not to generate an undefined exception.
'$undefp0'([_M|'$imported_predicate'(G, _ImportingMod, G, prolog)], _Action) :-
nonvar(G), '$is_system_predicate'(G, prolog), !.
'$undefp0'([_M|print_message(A,B)], _Action) :-
!.
'$undefp0'([_M|sort(A,B)], _Action) :-
!,
'$sort'(A,B).
'$undefp0'([M|G], _Action) :-
stream_property( loop_stream, file_name(F)),
stream_property( loop_stream, line_number(L)),
%'$bootstrap_predicate'(G, M, Action).
writeln(F:L:M:G),
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fail.
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:- '$undefp_handler'('$undefp0'(_,_),prolog).
live :-
repeat,
'$current_module'(Module),
( Module==user ->
true % '$compile_mode'(_,0)
;
format(user_error,'[~w]~n', [Module])
),
'$system_catch'('$enter_top_level',Module,Error,'$Error'(Error)).
initialize_prolog :-
'$init_system'.
'$init_globals' :-
% set_prolog_flag(break_level, 0),
% '$set_read_error_handler'(error), let the user do that
nb_setval('$chr_toplevel_show_store',false).
'$init_consult' :-
set_value('$open_expands_filename',true),
nb_setval('$assert_all',off),
nb_setval('$if_level',0),
nb_setval('$endif',off),
nb_setval('$initialization_goals',off),
nb_setval('$included_file',[]),
nb_setval('$loop_streams',[]),
\+ '$undefined'('$init_preds',prolog),
'$init_preds',
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fail.
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'$init_consult'.
'$init_win_graphics' :-
'$undefined'(window_title(_,_), system), !.
'$init_win_graphics' :-
load_files([library(win_menu)], [silent(true),if(not_loaded)]),
fail.
'$init_win_graphics'.
'$init_or_threads' :-
'$c_yapor_workers'(W), !,
'$start_orp_threads'(W).
'$init_or_threads'.
'$start_orp_threads'(1) :- !.
'$start_orp_threads'(W) :-
thread_create('$c_worker',_,[detached(true)]),
W1 is W-1,
'$start_orp_threads'(W1).
'$version' :-
current_prolog_flag(halt_after_consult, false),
current_prolog_flag(verbose, normal), !,
current_prolog_flag(version_git,VersionGit),
current_prolog_flag(compiled_at,AT),
current_prolog_flag(version_data, yap(Mj, Mi, Patch, _) ),
sub_atom( VersionGit, 0, 8, _, VERSIONGIT ),
current_prolog_flag(version_data, yap(Mj, Mi, Patch, _) ),
current_prolog_flag(resource_database, Saved ),
format(user_error, '% YAP ~d.~d.~d-~a (compiled ~a)~n', [Mj,Mi, Patch, VERSIONGIT, AT]),
format(user_error, '% database loaded from ~a~n', [Saved]),
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fail.
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'$version'.
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'$init_system' :-
get_value('$yap_inited', true), !.
'$init_system' :-
set_value('$yap_inited', true), % start_low_level_trace,
% do catch as early as possible
'$version',
current_prolog_flag(file_name_variables, OldF),
set_prolog_flag(file_name_variables, true),
'$init_consult',
set_prolog_flag(file_name_variables, OldF),
'$init_globals',
set_prolog_flag(fileerrors, true),
set_value('$gc',on),
('$exit_undefp' -> true ; true),
prompt1(' ?- '),
set_prolog_flag(debug, false),
% simple trick to find out if this is we are booting from Prolog.
% boot from a saved state
(
current_prolog_flag(saved_program, true)
% use saved state
->
'$init_state'
;
qsave_program( 'startup.yss')
),
'$db_clean_queues'(0),
% this must be executed from C-code.
% '$startup_saved_state',
set_input(user_input),
set_output(user_output),
'$init_or_threads',
'$run_at_thread_start'.
% Start file for yap
/* I/O predicates */
/* meaning of flags for '$write' is
1 quote illegal atoms
2 ignore operator declarations
4 output '$VAR'(N) terms as A, B, C, ...
8 use portray(_)
*/
/* main execution loop */
'$read_toplevel'(Goal, Bindings) :-
'$prompt',
catch(read_term(user_input,
Goal,
[variable_names(Bindings), syntax_errors(dec10)]),
E, '$handle_toplevel_error'( E) ).
'$handle_toplevel_error'( syntax_error(_)) :-
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!,
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fail.
'$handle_toplevel_error'( error(io_error(read,user_input),_)) :-
!.
'$handle_toplevel_error'(_, E) :-
throw(E).
/** @pred stream_property( _Stream_, _Prop_)
*/
% reset alarms when entering top-level.
'$enter_top_level' :-
'$alarm'(0, 0, _, _),
fail.
'$enter_top_level' :-
'$clean_up_dead_clauses',
fail.
'$enter_top_level' :-
get_value('$top_level_goal',GA), GA \= [], !,
set_value('$top_level_goal',[]),
'$run_atom_goal'(GA),
current_prolog_flag(break_level, BreakLevel),
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(
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BreakLevel \= 0
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->
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true
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;
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'$pred_exists'(halt(_), user)
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->
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halt(0)
;
'$halt'(0)
).
'$enter_top_level' :-
flush_output,
'$run_toplevel_hooks',
prompt1(' ?- '),
'$read_toplevel'(Command,Varnames),
nb_setval('$spy_gn',1),
% stop at spy-points if debugging is on.
nb_setval('$debug_state', state(creep,0,stop)),
'$command'(Command,Varnames,_Pos,top),
current_prolog_flag(break_level, BreakLevel),
(
BreakLevel \= 0
->
true
;
'$pred_exists'(halt(_), user)
-> halt(0)
;
'$halt'(0)
).
'$erase_sets' :-
eraseall('$'),
eraseall('$$set'),
eraseall('$$one'),
eraseall('$reconsulted'), fail.
'$erase_sets' :- \+ recorded('$path',_,_), recorda('$path',"",_).
'$erase_sets'.
'$start_corouts' :-
eraseall('$corout'),
eraseall('$result'),
eraseall('$actual'),
fail.
'$start_corouts' :- recorda('$actual',main,_),
recordz('$corout','$corout'(main,main,'$corout'([],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[])),_Ref),
recorda('$result',going,_).
'$command'(C,VL,Pos,Con) :-
current_prolog_flag(strict_iso, true), !, /* strict_iso on */
'$execute_command'(C,VL,Pos,Con,_Source).
'$command'(C,VL,Pos,Con) :-
( (Con = top ; var(C) ; C = [_|_]) ->
'$execute_command'(C,VL,Pos,Con,C), ! ;
% do term expansion
expand_term(C, EC),
% execute a list of commands
'$execute_commands'(EC,VL,Pos,Con,_Source),
% succeed only if the *original* was at end of file.
C == end_of_file
).
%
% Hack in case expand_term has created a list of commands.
%
'$execute_commands'(V,_,_,_,Source) :- var(V), !,
'$do_error'(instantiation_error,meta_call(Source)).
'$execute_commands'([],_,_,_,_) :- !.
'$execute_commands'([C|Cs],VL,Pos,Con,Source) :- !,
(
'$system_catch'('$execute_command'(C,VL,Pos,Con,Source),prolog,Error,'$LoopError'(Error, Con)),
fail
;
'$execute_commands'(Cs,VL,Pos,Con,Source)
).
'$execute_commands'(C,VL,Pos,Con,Source) :-
'$execute_command'(C,VL,Pos,Con,Source).
%
%
%
'$execute_command'(C,_,_,top,Source) :-
var(C),
!,
'$do_error'(instantiation_error,meta_call(Source)).
'$execute_command'(C,_,_,top,Source) :-
number(C),
!,
'$do_error'(type_error(callable,C),meta_call(Source)).
'$execute_command'(R,_,_,top,Source) :-
db_reference(R),
!,
'$do_error'(type_error(callable,R),meta_call(Source)).
'$execute_command'(end_of_file,_,_,_,_) :- !.
'$execute_command'(Command,_,_,_,_) :-
'__NB_getval__'('$if_skip_mode', skip, fail),
\+ '$if_directive'(Command),
!.
'$execute_command'((:-G),VL,Pos,Option,_) :-
% !,
Option \= top, !,
% allow user expansion
expand_term((:- G), O),
(
O = (:- G1)
->
'$yap_strip_module'(G1, M, G2),
'$process_directive'(G2, Option, M, VL, Pos)
;
'$execute_commands'(G1,VL,Pos,Option,O)
).
'$execute_command'((?-G), VL, Pos, Option, Source) :-
Option \= top,
!,
'$execute_command'(G, VL, Pos, top, Source).
'$execute_command'(G, VL, Pos, Option, Source) :-
'$continue_with_command'(Option, VL, Pos, G, Source).
'$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) :-
% writeln(G),
'$go_compile_clause'(G,V,Pos,reconsult,Source),
fail.
'$continue_with_command'(consult,V,Pos,G,Source) :-
'$go_compile_clause'(G,V,Pos,consult,Source),
fail.
'$continue_with_command'(top,V,_,G,_) :-
'$query'(G,V).
%%
% @pred '$go_compile_clause'(G,Vs,Pos, Where, Source) is det
%
% interfaces the loader and the compiler
% not 100% compatible with SICStus Prolog, as SICStus Prolog would put
% module prefixes all over the place, although unnecessarily so.
%
% @param [in] _G_ is the clause to compile
% @param [in] _Vs_ a list of variables and their name
% @param [in] _Pos_ the source-code position
% @param [in] _N_ a flag telling whether to add first or last
% @param [out] _Source_ the user-tranasformed clause
'$go_compile_clause'(G, _Vs, _Pos, Where, Source) :-
'$precompile_term'(G, Source, G1),
!,
'$$compile'(G1, Where, Source, _).
'$go_compile_clause'(G,_Vs,_Pos, _Where, _Source) :-
throw(error(system, compilation_failed(G))).
'$$compile'(C, Where, C0, R) :-
'$head_and_body'( C, MH, B ),
strip_module( MH, Mod, H),
(
'$undefined'(H, Mod)
->
'$init_pred'(H, Mod, Where)
;
true
),
% writeln(Mod:((H:-B))),
'$compile'((H:-B), Where, C0, Mod, R).
'$init_pred'(H, Mod, _Where ) :-
recorded('$import','$import'(NM,Mod,NH,H,_,_),RI),
% NM \= Mod,
functor(NH,N,Ar),
print_message(warning,redefine_imported(Mod,NM,Mod:N/Ar)),
erase(RI),
fail.
'$init_pred'(H, Mod, Where ) :-
'$init_as_dynamic'(Where),
!,
functor(H, Na, Ar),
'$dynamic'(Na/Ar, Mod).
'$init_pred'(_H, _Mod, _Where ).
'$init_as_dynamic'( asserta ).
'$init_as_dynamic'( assertz ).
'$init_as_dynamic'( consult ) :-
'__NB_getval__'('$assert_all',on,fail).
'$init_as_dynamic'( reconsult ) :-
'__NB_getval__'('$assert_all',on,fail).
'$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_module'(M),
'$current_choice_point'(CP),
'$user_call'(G, M),
'$current_choice_point'(NCP),
'$delayed_goals'(G, V, Vs, LGs, DCP),
'$write_answer'(Vs, 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.
'$process_answer'(Vs, LGs, Bindings) :-
'$purge_dontcares'(Vs,IVs),
'$sort'(IVs, NVs),
'$prep_answer_var_by_var'(NVs, LAnsw, LGs),
'$name_vars_in_goals'(LAnsw, Vs, Bindings).
%
% *-> 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' :-
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) :-
current_prolog_flag(break_level, BL ),
( BL \= 0 -> format(user_error, '[~p] ',[BL]) ;
true ),
( current_prolog_flag(toplevel_print_options, Opts) ->
write_term(user_error,Answ,Opts) ;
format(user_error,'~w',[Answ])
),
format(user_error,'.~n', []).
'$another' :-
format(user_error,' ? ',[]),
'$clear_input'(user_input),
get_code(user_input,C),
'$do_another'(C).
'$do_another'(C) :-
( C=:= ";" ->
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
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;
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skip(user_input,10), '$ask_again_for_another'
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).
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%'$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) :-
'$process_answer'(Vs, LBlk, NLAnsw),
'$write_vars_and_goals'(NLAnsw, first, FLAnsw).
write_query_answer( Bindings ) :-
'$write_vars_and_goals'(Bindings, 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,' = ', []),
( yap_flag(toplevel_print_options, 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',[]) ),
( yap_flag(toplevel_print_options, 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',[]) ),
( yap_flag(toplevel_print_options, 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',[]) ),
( yap_flag(toplevel_print_options, 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'([V|NGVL], I0, IF) :-
I is I0+1,
'$gen_name_string'(I0,[],SName), !,
atom_codes(Name, [95|SName]),
V = '$VAR'(Name),
'$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,' = ~a',[V]),
'$write_output_vars'(VL).
%
% 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) :-
gated_call(
'$enable_debugging',
M:G,
Port,
'$disable_debugging_on_port'(Port)
).
'$disable_debugging_on_port'(retry) :-
!,
'$enable_debugging'.
'$disable_debugging_on_port'(_Port) :-
'$disable_debugging'.
% enable creeping
'$enable_debugging':-
current_prolog_flag(debug, false), !.
'$enable_debugging' :-
'__NB_setval__'('$debug_status', state(creep, 0, stop)),
'$trace_on', !,
'$creep'.
'$enable_debugging'.
'$trace_on' :-
'__NB_getval__'('$trace', on, fail).
'$trace_off' :-
'__NB_getval__'('$trace', off, fail).
'$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) :- !,
\+ ('$current_choice_point'(CP),
'$call'(X,CP,G0,M) ).
'$call'(!, CP, _,_) :- !,
'$$cut_by'(CP).
'$call'([A|B], _, _, M) :- !,
'$csult'([A|B], M).
'$call'(G, _CP, _G0, CurMod) :-
/*
(
'$is_metapredicate'(G,CurMod)
->
'$disable_debugging',
( '$expand_meta_call'(CurMod:G, [], NG) -> true ; true ),
'$enable_debugging'
;
NG = G
),
*/
'$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'(_,_).
'$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, top)),
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, top)),
prolog_flag(agc_margin,_,Old),
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!.
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'$loop'(Stream,Status) :-
repeat,
'$current_module'( OldModule, OldModule ),
'$system_catch'( '$enter_command'(Stream,OldModule,Status),
OldModule, Error,
user:'$LoopError'(Error, Status)
),
!.
'$boot_loop'(Stream,Where) :-
repeat,
'$current_module'( OldModule, OldModule ),
read_clause(Stream, Command, [module(OldModule), syntax_errors(dec10),variable_names(_Vars), term_position(_Pos)]),
(Command == end_of_file
->
!
;
Command = (:- Goal) ->
'$system_catch'('$boot_execute'(Goal), prolog, Error,
user:'$LoopError'(Error, consult) ),
fail
;
Command = (H --> B) ->
'$system_catch'('$boot_dcg'(H,B, Where), prolog, Error,
user:'$LoopError'(Error, consult) ),
fail
;
'$system_catch'('$boot_clause'( Command, Where ), prolog, Error,
user:'$LoopError'(Error, consult) ),
fail
).
'$boot_execute'( Goal ) :-
'$execute'( Goal ),
!.
'$boot_execute'( Goal ) :-
format(user_error, ':- ~w failed.~n', [Goal]).
'$boot_dcg'( H, B, Where ) :-
'$translate_rule'((H --> B), (NH :- NB) ),
'$$compile'((NH :- NB), Where, ( H --> B), _R),
!.
'$boot_dcg'( H, B, _ ) :-
format(user_error, ' ~w --> ~w failed.~n', [H,B]).
'$boot_clause'( Command, Where ) :-
'$$compile'(Command, Where, Command, _R),
!.
'$boot_clause'( Command, _ ) :-
format(user_error, ' ~w failed.~n', [Command]).
'$enter_command'(Stream, Mod, Status) :-
prompt1(': '), prompt(_,' '),
Options = [module(Mod), syntax_errors(dec10),variable_names(Vars), term_position(Pos)],
(
Status == top
->
read_term(Stream, Command, Options)
;
read_clause(Stream, Command, Options)
),
'$command'(Command,Vars,Pos, Status).
/** @pred user:expand_term( _T_,- _X_) is dynamic,multifile.
This user-defined predicate is called by YAP after
reading goals and clauses.
- _Module_:`expand_term(` _T_ , _X_) is called first on the
current source module _Module_ ; if i
- `user:expand_term(` _T_ , _X_ `)` is available on every module.
*/
/* General purpose predicates */
'$head_and_body'((H:-B),H,B) :- !.
'$head_and_body'(H,H,true).
gated_call(Setup, Goal, Catcher, Cleanup) :-
'$setup_call_catcher_cleanup'(Setup),
'$gated_call'( true , Goal, Catcher, Cleanup) .
'$gated_call'( All , Goal, Catcher, Cleanup) :-
Task0 = cleanup( All, Catcher, Cleanup, Tag, true, CP0),
TaskF = cleanup( All, Catcher, Cleanup, Tag, false, CP0),
'$tag_cleanup'(CP0, Task0),
'$execute'( Goal ),
'$cleanup_on_exit'(CP0, TaskF).
%
% split head and body, generate an error if body is unbound.
%
'$check_head_and_body'(C,M,H,B,P) :-
'$yap_strip_module'(C,M1,(MH:-B0)),
!,
'$yap_strip_module'(M1:MH,M,H),
( M == M1 -> B = B0 ; B = M1:B0),
is_callable(M:H,P).
'$check_head_and_body'(MH, M, H, true, P) :-
'$yap_strip_module'(MH,M,H),
is_callable(M:H,P).
% term expansion
%
% return two arguments: Expanded0 is the term after "USER" expansion.
% Expanded is the final expanded term.
%
'$precompile_term'(Term, ExpandedUser, Expanded) :-
%format('[ ~w~n',[Term]),
'$expand_clause'(Term, ExpandedUser, ExpandedI),
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!,
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%format(' -> ~w~n',[Expanded0]),
(
current_prolog_flag(strict_iso, true) /* strict_iso on */
->
Expanded = ExpandedI,
'$check_iso_strict_clause'(ExpandedUser)
;
'$expand_array_accesses_in_term'(ExpandedI,Expanded)
-> true
;
Expanded = ExpandedI
).
'$precompile_term'(Term, Term, Term).
'$expand_clause'(InputCl, C1, CO) :-
source_module(SM),
'$yap_strip_clause'(SM:InputCl, M, ICl),
'$expand_a_clause'( M:ICl, SM, C1, CO),
!.
'$expand_clause'(Cl, Cl, Cl).
/** @pred expand_term( _T_,- _X_)
This predicate is used by YAP for preprocessing each top level
term read when consulting a file and before asserting or executing it.
It rewrites a term _T_ to a term _X_ according to the following
rules: first try term_expansion/2 in the current module, and then try to use the user defined predicate user:term_expansion/2`. If this call fails then the translating process
for DCG rules is applied, together with the arithmetic optimizer
whenever the compilation of arithmetic expressions is in progress.
*/
expand_term(Term,Expanded) :-
(
'$do_term_expansion'(Term,Expanded)
->
true
;
'$expand_term_grammar'(Term,Expanded)
).
%
% Grammar Rules expansion
%
'$expand_term_grammar'((A-->B), C) :-
prolog:'$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
/** @pred catch( : _Goal_,+ _Exception_,+ _Action_) is iso
The goal `catch( _Goal_, _Exception_, _Action_)` tries to
execute goal _Goal_. If during its execution, _Goal_ throws an
exception _E'_ and this exception unifies with _Exception_, the
exception is considered to be caught and _Action_ is executed. If
the exception _E'_ does not unify with _Exception_, control
again throws the exception.
The top-level of YAP maintains a default exception handler that
is responsible to capture uncaught exceptions.
*/
catch(G, C, A) :-
'$catch'(G,C,A).
% 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'(M:G,C,A).
'$catch'(MG,_,_) :-
'$$save_by'(CP0),
'$execute'(MG),
'$$save_by'(CP1),
% remove catch
(
CP0 == CP1
->
!
;
true
).
'$catch'(_,C,A) :-
'$get_exception'(C),
'$run_catch'(A, C).
% variable throws are user-handled.
'$run_catch'(G,E) :-
E = '$VAR'(_),
!,
call(G ).
'$run_catch'(abort,_) :-
abort.
'$run_catch'('$Error'(E),E) :-
!,
'$LoopError'(E, top ).
'$run_catch'('$LoopError'(E, Where),E) :-
!,
'$LoopError'(E, Where).
'$run_catch'('$TraceError'(E, GoalNumber, G, Module, CalledFromDebugger),E) :-
!,
'$TraceError'(E, GoalNumber, G, Module, CalledFromDebugger).
'$run_catch'(_Signal,E) :-
functor( E, N, _),
'$hidden_atom'(N), !,
throw(E).
'$run_catch'( Signal, _E) :-
call( Signal ).
%
% throw has to be *exactly* after system catch!
%
/** @pred throw(+ _Ball_) is iso
The goal `throw( _Ball_)` throws an exception. Execution is
stopped, and the exception is sent to the ancestor goals until reaching
a matching catch/3, or until reaching top-level.
*/
throw(Ball) :-
% get current jump point
'$jump_env_and_store_ball'(Ball).
'$run_toplevel_hooks' :-
current_prolog_flag(break_level, 0 ),
recorded('$toplevel_hooks',H,_),
H \= fail, !,
( call(user:H) -> true ; true).
'$run_toplevel_hooks'.
'$run_at_thread_start' :-
recorded('$thread_initialization',M:D,_),
'$meta_call'(D, M),
fail.
'$run_at_thread_start'.
log_event( String, Args ) :-
format( atom( M ), String, Args),
log_event( M ).
'$prompt' :-
current_prolog_flag(break_level, BreakLevel),
(
BreakLevel == 0
->
LF = LD
;
LF = ['Break (level ', BreakLevel, ')'|LD]
),
current_prolog_flag(debug, DBON),
(
'$trace_on'
->
(
var(LF)
->
LD = ['trace'|LP]
;
LD = [', trace '|LP]
)
;
DBON == true
->
(var(LF)
->
LD = ['debug'|LP]
;
LD = [', debug'|LP]
)
;
LD = LP
),
(
var(LF)
->
LP = [P]
;
LP = [' ',P]
),
yap_flag(toplevel_prompt, P),
atomic_concat(LF, PF),
prompt1(PF),
prompt(_,' | '),
'$ensure_prompting'.
/**
@} @}
*/
/**
@{
@defgroup library The Prolog library
@addtogroup YAPControl
@ingroup builtins
@{
*/
:- system_module( '$_init', [!/0,
':-'/1,
'?-'/1,
[]/0,
extensions_to_present_answer/1,
fail/0,
false/0,
goal_expansion/2,
goal_expansion/3,
otherwise/0,
term_expansion/2,
version/2,
'$do_log_upd_clause'/6,
'$do_log_upd_clause0'/6,
'$do_log_upd_clause_erase'/6,
'$do_static_clause'/5], [
'$system_module'/1]).
:- use_system_module( '$_boot', ['$cut_by'/1]).
%:- start_low_level_trace.
% This is the YAP init file
% should be consulted first step after booting
% These are pseudo declarations
% so that the user will get a redefining system predicate
% just create a choice-point
% the 6th argument marks the time-stamp.
'$do_log_upd_clause'(_,_,_,_,_,_).
'$do_log_upd_clause'(A,B,C,D,E,_) :-
'$continue_log_update_clause'(A,B,C,D,E).
'$do_log_upd_clause'(_,_,_,_,_,_).
'$do_log_upd_clause_erase'(_,_,_,_,_,_).
'$do_log_upd_clause_erase'(A,B,C,D,E,_) :-
'$continue_log_update_clause_erase'(A,B,C,D,E).
'$do_log_upd_clause_erase'(_,_,_,_,_,_).
'$do_log_upd_clause0'(_,_,_,_,_,_).
'$do_log_upd_clause0'(A,B,C,D,_,_) :-
'$continue_log_update_clause'(A,B,C,D).
'$do_log_upd_clause0'(_,_,_,_,_,_).
'$do_static_clause'(_,_,_,_,_).
'$do_static_clause'(A,B,C,D,E) :-
'$continue_static_clause'(A,B,C,D,E).
'$do_static_clause'(_,_,_,_,_).
%:- start_low_level_trace.
:- c_compile('arith.yap').
:- c_compile('builtins.yap').
%:- stop_low_level_trace.
:- '$all_current_modules'(M), yap_flag(M:unknown, error) ; true.
:- compile_expressions.
:- c_compile('imports.yap').
:- c_compile('bootutils.yap').
:- c_compile('bootlists.yap').
:- c_compile('consult.yap').
:- c_compile('preddecls.yap').
:- c_compile('preddyns.yap').
:- c_compile('meta.yap').
:- c_compile('newmod.yap').
:- c_compile('atoms.yap').
:- c_compile('os.yap').
:- c_compile('grammar.yap').
:- c_compile('errors.yap').
:- c_compile('absf.yap').
%:- set_prolog_flag(verbose_file_search, true ).
%:- yap_flag(write_strings,on).
%:- start_low_level_trace.
:- [
'preds.yap',
'modules.yap'
].
:- use_module('error.yap').
:- [
'utils.yap',
'control.yap',
'flags.yap'
].
:- [
% lists is often used.
'../os/yio.yap',
'../pl/debug.yap',
'checker.yap',
'depth_bound.yap',
'ground.yap',
'listing.yap',
'arithpreds.yap',
% modules must be after preds, otherwise we will have trouble
% with meta-predicate expansion being invoked
% must follow grammar
'eval.yap',
'signals.yap',
'profile.yap',
'callcount.yap',
'load_foreign.yap',
% 'save.yap',
'setof.yap',
'sort.yap',
'statistics.yap',
'strict_iso.yap',
'tabling.yap',
'threads.yap',
'eam.yap',
'yapor.yap',
'qly.yap',
'spy.yap',
'udi.yap'].
:- meta_predicate(log_event(+,:)).
:- dynamic prolog:'$user_defined_flag'/4.
:- multifile prolog:debug_action_hook/1.
:- multifile prolog:'$system_predicate'/2.
:- ['protect.yap'].
version(yap,[6,3]).
:- op(1150,fx,(mode)).
:- dynamic 'extensions_to_present_answer'/1.
:- ['arrays.yap'].
%:- start_low_level_trace.
:- multifile user:portray_message/2.
:- dynamic user:portray_message/2.
/** @pred _CurrentModule_:goal_expansion(+ _G_,+ _M_,- _NG_), user:goal_expansion(+ _G_,+ _M_,- _NG_)
YAP now supports goal_expansion/3. This is an user-defined
procedure that is called after term expansion when compiling or
asserting goals for each sub-goal in a clause. The first argument is
bound to the goal and the second to the module under which the goal
_G_ will execute. If goal_expansion/3 succeeds the new
sub-goal _NG_ will replace _G_ and will be processed in the same
way. If goal_expansion/3 fails the system will use the default
*/
:- multifile user:goal_expansion/3.
:- dynamic user:goal_expansion/3.
:- multifile user:goal_expansion/2.
:- dynamic user:goal_expansion/2.
:- multifile system:goal_expansion/2.
:- dynamic system:goal_expansion/2.
:- multifile goal_expansion/2.
:- dynamic goal_expansion/2.
:- use_module('messages.yap').
:- ['undefined.yap'].
:- use_module('hacks.yap').
:- use_module('attributes.yap').
:- use_module('corout.yap').
:- use_module('dialect.yap').
:- use_module('dbload.yap').
:- use_module('../library/ypp.yap').
:- use_module('../os/chartypes.yap').
:- ensure_loaded('../os/edio.yap').
yap_hacks:cut_by(CP) :- '$$cut_by'(CP).
:- '$change_type_of_char'(36,7). % Make $ a symbol character
:- set_prolog_flag(generate_debug_info,true).
%
% cleanup ensure loaded and recover some data-base space.
%
%:- ( recorded('$lf_loaded',_,R), erase(R), fail ; true ).
%:- ( recorded('$module',_,R), erase(R), fail ; true ).
:- set_value('$user_module',user), '$protect'.
:- style_check([+discontiguous,+multiple,+single_var]).
%
% moved this to init_gc in gc.c to separate the alpha
%
% :- yap_flag(gc,on).
% :- yap_flag(gc_trace,verbose).
:- multifile
prolog:comment_hook/3.
:- source.
:- module(user).
/** @pred _CurrentModule_:term_expansion( _T_,- _X_), user:term_expansion( _T_,- _X_)
This user-defined predicate is called by `expand_term/3` to
preprocess all terms read when consulting a file. If it succeeds:
+
If _X_ is of the form `:- G` or `?- G`, it is processed as
a directive.
+
If _X_ is of the form `$source_location`( _File_, _Line_): _Clause_` it is processed as if from `File` and line `Line`.
+
If _X_ is a list, all terms of the list are asserted or processed
as directives.
+ The term _X_ is asserted instead of _T_.
*/
:- multifile term_expansion/2.
:- dynamic term_expansion/2.
:- multifile system:term_expansion/2.
:- dynamic system:term_expansion/2.
:- multifile swi:swi_predicate_table/4.
/** @pred user:message_hook(+ _Term_, + _Kind_, + _Lines_)
Hook predicate that may be define in the module `user` to intercept
messages from print_message/2. _Term_ and _Kind_ are the
same as passed to print_message/2. _Lines_ is a list of
format statements as described with print_message_lines/3.
This predicate should be defined dynamic and multifile to allow other
modules defining clauses for it too.
*/
:- multifile user:message_hook/3.
:- dynamic user:message_hook/3.
/** @pred exception(+ _Exception_, + _Context_, - _Action_)
Dynamic predicate, normally not defined. Called by the Prolog system on run-time exceptions that can be repaired `just-in-time`. The values for _Exception_ are described below. See also catch/3 and throw/1.
If this hook predicate succeeds it must instantiate the _Action_ argument to the atom `fail` to make the operation fail silently, `retry` to tell Prolog to retry the operation or `error` to make the system generate an exception. The action `retry` only makes sense if this hook modified the environment such that the operation can now succeed without error.
+ `undefined_predicate`
_Context_ is instantiated to a predicate-indicator ( _Module:Name/Arity_). If the predicate fails Prolog will generate an existence_error exception. The hook is intended to implement alternatives to the SWI built-in autoloader, such as autoloading code from a database. Do not use this hook to suppress existence errors on predicates. See also `unknown`.
+ `undefined_global_variable`
_Context_ is instantiated to the name of the missing global variable. The hook must call nb_setval/2 or b_setval/2 before returning with the action retry.
*/
:- multifile user:exception/3.
:- dynamic user:exception/3.
:- ensure_loaded('../pl/pathconf.yap').
/*
Add some tests
*/
:- yap_flag(user:unknown,error).
/*
:- if(predicate_property(run_tests, static)).
aa b.
p(X,Y) :- Y is X*X.
prefix(information, '% ', S, user_error) --> [].
:- format('~d~n', [a]).
:- format('~d~n', []).
:- p(X,Y).
a(1).
a.
a(2).
a(2).
lists:member(1,[1]).
clause_to_indicator(T, M:Name/Arity) :- ,
strip_module(T, M, T1),
pred_arity( T1, Name, Arity ).
:- endif.
*/
/**
@{
@defgroup library The Prolog library
@addtogroup YAPControl
@ingroup builtins
@{
*/
:- '$system_predicate'(
[!/0,
':-'/1,
'?-'/1,
[]/0,
extensions_to_present_answer/1,
fail/0,
false/0,
goal_expansion/2,
goal_expansion/3,
otherwise/0,
term_expansion/2,
version/2]).
%:- start_low_level_trace.
% This is the YAP init file
% should be consulted first step after booting
% These are pseudo declarations
% so that the user will get a redefining system predicate
:- '$init_pred_flag_vals'('$flag_info'(a,0), prolog).
/** @pred fail is iso
Always fails.
*/
fail :- fail.
/** @pred false is iso
The same as fail.
*/
false :- fail.
otherwise.
!.
(:- G) :- '$execute'(G), !.
(?- G) :- '$execute'(G).
'$$!'(CP) :- '$cut_by'(CP).
[] :- true.
% just create a choice-point
% the 6th argument marks the time-stamp.
'$do_log_upd_clause'(_,_,_,_,_,_).
'$do_log_upd_clause'(A,B,C,D,E,_) :-
'$continue_log_update_clause'(A,B,C,D,E).
'$do_log_upd_clause'(_,_,_,_,_,_).
'$do_log_upd_clause_erase'(_,_,_,_,_,_).
'$do_log_upd_clause_erase'(A,B,C,D,E,_) :-
'$continue_log_update_clause_erase'(A,B,C,D,E).
'$do_log_upd_clause_erase'(_,_,_,_,_,_).
'$do_log_upd_clause0'(_,_,_,_,_,_).
'$do_log_upd_clause0'(A,B,C,D,_,_) :-
'$continue_log_update_clause'(A,B,C,D).
'$do_log_upd_clause0'(_,_,_,_,_,_).
'$do_static_clause'(_,_,_,_,_).
'$do_static_clause'(A,B,C,D,E) :-
'$continue_static_clause'(A,B,C,D,E).
'$do_static_clause'(_,_,_,_,_).
:- c_compile('arith.yap', prolog).
:- '$all_current_modules'(M), yap_flag(M:unknown, error) ; true.
:- compile_expressions.
:- c_compile('bootutils.yap', prolog).
:- c_compile('bootlists.yap', prolog).
:- c_compile('consult.yap', prolog).
:- c_compile('preddecls.yap', prolog).
:- c_compile('preddyns.yap', prolog).
:- c_compile('meta.yap', prolog).
:- c_compile('newmod.yap', prolog).
:- c_compile('atoms.yap', prolog).
:- c_compile('os.yap', prolog).
:- c_compile('grammar.yap', prolog).
:- c_compile('directives.yap', prolog).
:- c_compile('absf.yap', prolog).
:- dynamic prolog:'$parent_module'/2.
%:- set_prolog_flag(verbose_file_search, true ).
%:- yap_flag(write_strings,on).
%:- start_low_level_trace.
:- ensure_loaded([
'preds.yap',
'modules.yap'
]).
%:-stop_low_level_trace.
:- use_module('error.yap').
:- ensure_loaded([
'errors.yap',
'utils.yap',
'control.yap',
'flags.yap'
]).
:- ensure_loaded([
% lists is often used.
'../os/yio.yap',
'debug.yap',
'checker.yap',
'depth_bound.yap',
'ground.yap',
'listing.yap',
'arithpreds.yap',
% modules must be after preds, otherwise we will have trouble
% with meta-predicate expansion being invoked
% must follow grammar
'eval.yap',
'signals.yap',
'profile.yap',
'callcount.yap',
'load_foreign.yap',
% 'save.yap',
'setof.yap',
'sort.yap',
'statistics.yap',
'strict_iso.yap',
'tabling.yap',
'threads.yap',
'eam.yap',
'yapor.yap',
'qly.yap',
'spy.yap',
'udi.yap']).
:- meta_predicate(log_event(+,:)).
:- dynamic prolog:'$user_defined_flag'/4.
:- multifile prolog:debug_action_hook/1.
:- multifile prolog:'$system_predicate'/2.
:- ensure_loaded(['protect.yap']).
version(yap,[6,3]).
:- op(1150,fx,(mode)).
:- dynamic 'extensions_to_present_answer'/1.
:- ensure_loaded(['arrays.yap']).
%:- start_low_level_trace.
:- multifile user:portray_message/2.
:- dynamic user:portray_message/2.
/** @pred _CurrentModule_:goal_expansion(+ _G_,+ _M_,- _NG_), user:goal_expansion(+ _G_,+ _M_,- _NG_)
YAP now supports goal_expansion/3. This is an user-defined
procedure that is called after term expansion when compiling or
asserting goals for each sub-goal in a clause. The first argument is
bound to the goal and the second to the module under which the goal
_G_ will execute. If goal_expansion/3 succeeds the new
sub-goal _NG_ will replace _G_ and will be processed in the same
way. If goal_expansion/3 fails the system will use the default
*/
:- multifile user:goal_expansion/3.
:- dynamic user:goal_expansion/3.
:- multifile user:goal_expansion/2.
:- dynamic user:goal_expansion/2.
:- multifile system:goal_expansion/2.
:- dynamic system:goal_expansion/2.
:- multifile goal_expansion/2.
:- dynamic goal_expansion/2.
:- use_module('messages.yap').
:- ensure_loaded(['undefined.yap']).
:- use_module('hacks.yap').
:- use_module('attributes.yap').
:- use_module('corout.yap').
:- use_module('dialect.yap').
:- use_module('dbload.yap').
:- use_module('../library/ypp.yap').
:- use_module('../os/chartypes.yap').
:- ensure_loaded('../os/edio.yap').
yap_hacks:cut_by(CP) :- '$$cut_by'(CP).
:- '$change_type_of_char'(36,7). % Make $ a symbol character
:- set_prolog_flag(generate_debug_info,true).
%
% cleanup ensure loaded and recover some data-base space.
%
:- ( recorded('$lf_loaded',_,R), erase(R), fail ; true ).
:- ( recorded('$lf_loaded',_,R), erase(R), fail ; true ).
:- ( recorded('$module',_,R), erase(R), fail ; true ).
:- set_value('$user_module',user), '$protect'.
:- style_check([+discontiguous,+multiple,+single_var]).
%
% moved this to init_gc in gc.c to separate the alpha
%
% :- yap_flag(gc,on).
% :- yap_flag(gc_trace,verbose).
:- multifile
prolog:comment_hook/3.
:- source.
:- module(user).
/** @pred _CurrentModule_:term_expansion( _T_,- _X_), user:term_expansion( _T_,- _X_)
This user-defined predicate is called by `expand_term/3` to
preprocess all terms read when consulting a file. If it succeeds:
+
If _X_ is of the form `:- G` or `?- G`, it is processed as
a directive.
+
If _X_ is of the form `$source_location`( _File_, _Line_): _Clause_` it is processed as if from `File` and line `Line`.
+
If _X_ is a list, all terms of the list are asserted or processed
as directives.
+ The term _X_ is asserted instead of _T_.
*/
:- multifile term_expansion/2.
:- dynamic term_expansion/2.
:- multifile system:term_expansion/2.
:- dynamic system:term_expansion/2.
:- multifile swi:swi_predicate_table/4.
/** @pred user:message_hook(+ _Term_, + _Kind_, + _Lines_)
Hook predicate that may be define in the module `user` to intercept
messages from print_message/2. _Term_ and _Kind_ are the
same as passed to print_message/2. _Lines_ is a list of
format statements as described with print_message_lines/3.
This predicate should be defined dynamic and multifile to allow other
modules defining clauses for it too.
*/
:- multifile user:message_hook/3.
:- dynamic user:message_hook/3.
/** @pred exception(+ _Exception_, + _Context_, - _Action_)
Dynamic predicate, normally not defined. Called by the Prolog system on run-time exceptions that can be repaired `just-in-time`. The values for _Exception_ are described below. See also catch/3 and throw/1.
If this hook predicate succeeds it must instantiate the _Action_ argument to the atom `fail` to make the operation fail silently, `retry` to tell Prolog to retry the operation or `error` to make the system generate an exception. The action `retry` only makes sense if this hook modified the environment such that the operation can now succeed without error.
+ `undefined_predicate`
_Context_ is instantiated to a predicate-indicator ( _Module:Name/Arity_). If the predicate fails Prolog will generate an existence_error exception. The hook is intended to implement alternatives to the SWI built-in autoloader, such as autoloading code from a database. Do not use this hook to suppress existence errors on predicates. See also `unknown`.
+ `undefined_global_variable`
_Context_ is instantiated to the name of the missing global variable. The hook must call nb_setval/2 or b_setval/2 before returning with the action retry.
*/
:- multifile user:exception/3.
:- dynamic user:exception/3.
:- ensure_loaded('pathconf.yap').
:- yap_flag(user:unknown,error).
:- halt(0).
