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yap-6.3/pl/boot.yap

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: boot.yap *
* Last rev: 8/2/88 *
* mods: *
* comments: boot file for Prolog *
* *
*************************************************************************/
% This one should come first so that disjunctions and long distance
% cuts are compiled right with co-routining.
%
true :- true.
'$live' :-
'$init_system',
'$do_live'.
'$do_live' :-
repeat,
'$set_input'(user_input),'$set_output'(user),
'$current_module'(Module),
( Module==user ->
'$compile_mode'(_,0)
;
format(user_error,'[~w]~n', [Module])
),
'$system_catch'('$enter_top_level',Module,Error,user:'$Error'(Error)).
'$init_system' :-
'$change_alias_to_stream'('$loop_stream','$stream'(0)),
% do catch as early as possible
(
'$access_yap_flags'(15, 0), \+ '$uncaught_throw' ->
'$version'
;
true
),
'$allocate_default_arena'(1024, 64),
'$enter_system_mode',
set_value(fileerrors,1),
set_value('$gc',on),
set_value('$lf_verbose',informational),
('$exit_undefp' -> true ; true),
prompt(' ?- '),
nb_setval('$break',0),
% '$set_read_error_handler'(error), let the user do that
nb_setval('$debug',off),
nb_setval('$trace',off),
b_setval('$spy_glist',[]),
% simple trick to find out if this is we are booting from Prolog.
get_value('$user_module',V),
(
V == []
->
'$current_module'(_,prolog)
;
'$current_module'(_,V), '$compile_mode'(_,0),
('$access_yap_flags'(16,0) ->
( exists('~/.yaprc') -> load_files('~/.yaprc', []) ; true ),
( exists('~/.prologrc') -> load_files('~/.prologrc', []) ; true ),
( exists('~/prolog.ini') -> load_files('~/prolog.ini', []) ; true )
;
true
)
),
'$db_clean_queues'(0),
'$startup_reconsult',
'$startup_goals'.
% 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 */
'$read_vars'(Stream,T,Mod,Pos,V) :-
'$read'(true,T,Mod,V,Pos,Err,Stream),
(nonvar(Err) ->
'$print_message'(error,Err), fail
;
true
).
% reset alarms when entering top-level.
'$enter_top_level' :-
'$alarm'(0, _),
fail.
'$enter_top_level' :-
'$clean_up_dead_clauses',
fail.
'$enter_top_level' :-
recorded('$restore_goal',G,R),
erase(R),
prompt(_,' | '),
'$system_catch'('$do_yes_no'((G->true),user),user,Error,user:'$Error'(Error)),
fail.
'$enter_top_level' :-
nb_getval('$break',BreakLevel),
(
nb_getval('$trace',on)
->
TraceDebug = trace
;
nb_getval('$debug', on)
->
TraceDebug = debug
;
true
),
'$print_message'(informational,prompt(BreakLevel,TraceDebug)),
fail.
'$enter_top_level' :-
get_value('$top_level_goal',GA), GA \= [], !,
set_value('$top_level_goal',[]),
'$run_atom_goal'(GA),
set_value('$live','$false').
'$enter_top_level' :-
prompt(_,' ?- '),
prompt(' | '),
'$run_toplevel_hooks',
'$read_vars'(user_input,Command,_,_,Varnames),
nb_setval('$spy_gn',1),
% stop at spy-points if debugging is on.
nb_setval('$debug_run',off),
nb_setval('$debug_zip',off),
prompt(_,' |: '),
'$command'((?-Command),Varnames,top),
'$sync_mmapped_arrays',
set_value('$live','$false').
'$startup_goals' :-
get_value('$extend_file_search_path',P), P \= [],
set_value('$extend_file_search_path',[]),
'$extend_file_search_path'(P),
fail.
'$startup_goals' :-
recorded('$startup_goal',G,_),
'$current_module'(Module),
'$system_catch'('$query'(once(G), []),Module,Error,user:'$Error'(Error)),
fail.
'$startup_goals' :-
get_value('$init_goal',GA),
GA \= [],
set_value('$init_goal',[]),
'$run_atom_goal'(GA),
fail.
'$startup_goals' :-
get_value('$myddas_goal',GA), GA \= [],
set_value('$myddas_goal',[]),
get_value('$myddas_user',User), User \= [],
set_value('$myddas_user',[]),
get_value('$myddas_db',Db), Db \= [],
set_value('$myddas_db',[]),
get_value('$myddas_host',HostT),
( HostT \= [] ->
Host = HostT,
set_value('$myddas_host',[])
;
Host = localhost
),
get_value('$myddas_pass',PassT),
( PassT \= [] ->
Pass = PassT,
set_value('$myddas_pass',[])
;
Pass = ''
),
use_module(library(myddas)),
call(db_open(mysql,myddas,Host/Db,User,Pass)),
'$myddas_import_all',
fail.
'$startup_goals'.
'$startup_reconsult' :-
get_value('$consult_on_boot',X), X \= [], !,
set_value('$consult_on_boot',[]),
'$do_startup_reconsult'(X).
'$startup_reconsult'.
%
% MYDDAS: Import all the tables from one database
%
'$myddas_import_all':-
call(db_my_show_tables(myddas,table(Table))),
call(db_import(myddas,Table,Table)),
fail.
'$myddas_import_all'.
'$erase_sets' :-
eraseall('$'),
eraseall('$$set'),
eraseall('$$one'),
eraseall('$reconsulted'), fail.
'$erase_sets' :- \+ recorded('$path',_,_), recorda('$path',"",_).
'$erase_sets'.
'$version' :-
get_value('$version_name',VersionName),
'$print_message'(help, version(VersionName)),
get_value('$myddas_version_name',MYDDASVersionName),
MYDDASVersionName \== [],
'$print_message'(help, myddas_version(MYDDASVersionName)),
fail.
'$version' :- recorded('$version',VersionName,_),
'$print_message'(help, VersionName),
fail.
'$version'.
repeat :- '$repeat'.
'$repeat'.
'$repeat'.
'$repeat'.
'$repeat'.
'$repeat'.
'$repeat'.
'$repeat'.
'$repeat'.
'$repeat'.
'$repeat' :- '$repeat'.
'$start_corouts' :- recorded('$corout','$corout'(Name,_,_),R), Name \= main, finish_corout(R),
fail.
'$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,Con) :-
'$access_yap_flags'(9,1), !,
'$execute_command'(C,VL,Con,C).
'$command'(C,VL,Con) :-
( (Con = top ; var(C) ; C = [_|_]) ->
'$execute_command'(C,VL,Con,C), ! ;
expand_term(C, EC),
'$execute_commands'(EC,VL,Con,C)
).
%
% Hack in case expand_term has created a list of commands.
%
'$execute_commands'(V,_,_,Source) :- var(V), !,
'$do_error'(instantiation_error,meta_call(Source)).
'$execute_commands'([],_,_,_) :- !, fail.
'$execute_commands'([C|Cs],VL,Con,Source) :- !,
(
'$execute_command'(C,VL,Con,Source)
;
'$execute_commands'(Cs,VL,Con,Source)
),
fail.
'$execute_commands'(C,VL,Con,Source) :-
'$execute_command'(C,VL,Con,Source).
%
%
%
'$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,_,_,_) :- !.
'$execute_command'((:-G),_,Option,_) :- !,
'$current_module'(M),
'$process_directive'(G, Option, M),
fail.
'$execute_command'((?-G),V,_,Source) :- !,
'$execute_command'(G,V,top,Source).
'$execute_command'(G,V,Option,Source) :-
'$continue_with_command'(Option,V,G,Source).
%
% This command is very different depending on the language mode we are in.
%
% ISO only wants directives in files
% SICStus accepts everything in files
% YAP accepts everything everywhere
%
'$process_directive'(G, top, M) :-
'$access_yap_flags'(8, 0), !, % YAP mode, go in and do it,
'$process_directive'(G, consult, M).
'$process_directive'(G, top, _) :- !,
'$do_error'(context_error((:- G),clause),query).
%
% allow modules
%
'$process_directive'(M:G, Mode, _) :- !,
'$process_directive'(G, Mode, M).
%
% default case
%
'$process_directive'(Gs, Mode, M) :-
'$all_directives'(Gs), !,
'$exec_directives'(Gs, Mode, M).
%
% ISO does not allow goals (use initialization).
%
'$process_directive'(D, _, M) :-
'$access_yap_flags'(8, 1), !, % ISO Prolog mode, go in and do it,
'$do_error'(context_error((:- M:D),query),directive).
%
% but YAP and SICStus does.
%
'$process_directive'(G, _, M) :-
( '$do_yes_no'(G,M) -> true ; format(user_error,':- ~w:~w failed.~n',[M,G]) ).
'$continue_with_command'(reconsult,V,G,Source) :-
'$go_compile_clause'(G,V,5,Source),
fail.
'$continue_with_command'(consult,V,G,Source) :-
'$go_compile_clause'(G,V,13,Source),
fail.
'$continue_with_command'(top,V,G,_) :-
'$query'(G,V).
%
% not 100% compatible with SICStus Prolog, as SICStus Prolog would put
% module prefixes all over the place, although unnecessarily so.
%
'$go_compile_clause'(Mod:G,V,N,Source) :- !,
'$go_compile_clause'(G,V,N,Mod,Source).
'$go_compile_clause'((M:G :- B),V,N,Source) :- !,
'$current_module'(M1),
(M1 = M ->
NG = (G :- B)
;
'$preprocess_clause_before_mod_change'((G:-B),M1,M,NG)
),
'$go_compile_clause'(NG,V,N,M,Source).
'$go_compile_clause'(G,V,N,Source) :-
'$current_module'(Mod),
'$go_compile_clause'(G,V,N,Mod,Source).
'$go_compile_clause'(G, V, N, Mod, Source) :-
'$prepare_term'(G, V, G0, G1, Mod, Source),
'$$compile'(G1, G0, N, Mod).
'$prepare_term'(G, V, G0, G1, Mod, Source) :-
( get_value('$syntaxcheckflag',on) ->
'$check_term'(Source, V, Mod) ; true ),
'$precompile_term'(G, G0, G1, Mod).
% process an input clause
'$$compile'(G, G0, L, Mod) :-
'$head_and_body'(G,H,_),
'$flags'(H, Mod, Fl, Fl),
is(NFl, /\, Fl, 0x00002000),
( NFl \= 0 -> '$assertz_dynamic'(L,G,G0,Mod) ;
'$compile'(G, L, G0, Mod) ).
'$check_if_reconsulted'(N,A) :-
recorded('$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('$reconsulting',_,R) -> erase(R) ).
/* Executing a query */
'$query'(end_of_file,_).
% ***************************
% * -------- YAPOR -------- *
% ***************************
'$query'(G,V) :-
\+ '$undefined'('$yapor_on', prolog),
'$yapor_on',
\+ '$undefined'('$start_yapor', prolog),
'$parallelizable'(G), !,
'$parallel_query'(G,V),
fail.
% end of YAPOR
'$query'(G,[]) :- !,
'$yes_no'(G,(?-)).
'$query'(G,V) :-
(
'$exit_system_mode',
'$execute'(G),
( '$enter_system_mode' ; '$exit_system_mode', fail),
'$output_frozen'(G, V, LGs),
'$write_answer'(V, LGs, Written),
'$write_query_answer_true'(Written),
'$another',
!, fail
;
'$enter_system_mode',
'$out_neg_answer'
).
'$yes_no'(G,C) :-
'$current_module'(M),
'$do_yes_no'(G,M),
'$output_frozen'(G, [], LGs),
'$write_answer'([], LGs, Written),
( Written = [] ->
!,'$present_answer'(C, yes);
'$another', !
),
fail.
'$yes_no'(_,_) :-
'$out_neg_answer'.
'$add_env_and_fail' :- fail.
'$out_neg_answer' :-
( '$undefined'('$print_message'(_,_),prolog) ->
'$present_answer'(user_error,"no~n", [])
;
print_message(help,no)
),
fail.
'$do_yes_no'([X|L], M) :- !, '$csult'([X|L], M).
'$do_yes_no'(G, M) :-
'$exit_system_mode',
'$execute'(M:G),
( '$enter_system_mode' ; '$exit_system_mode', fail ).
'$write_query_answer_true'([]) :- !,
format(user_error,'~ntrue',[]).
'$write_query_answer_true'(_).
'$output_frozen'(_,V,LGs) :-
\+ '$undefined'(bindings_message(_,_,_), swi),
swi:bindings_message(V, LGs, []), !.
'$output_frozen'(G,V,LGs) :-
'$extract_goal_vars_for_dump'(V,LIV),
'$show_frozen'(G,LIV,LGs).
'$extract_goal_vars_for_dump'([],[]).
'$extract_goal_vars_for_dump'([[_|V]|VL],[V|LIV]) :-
'$extract_goal_vars_for_dump'(VL,LIV).
%
% 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_all_streams',
fail.
'$present_answer'((?-), Answ) :-
nb_getval('$break',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),
( C== 0'; -> '$skip'(user_input,10), %'
'$add_nl_outside_console',
fail
;
C== 10 -> '$add_nl_outside_console',
( '$undefined'('$print_message'(_,_),prolog) ->
format(user_error,'yes~n', [])
;
print_message(help,yes)
)
;
C== -1 -> halt
;
'$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_all_streams',
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'([[[95|_]|_]|Vs],NVs) :- !,
'$purge_dontcares'(Vs,NVs).
'$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).
'$goal_to_string'(Format, G, String) :-
charsio:open_mem_write_stream(W),
format(W,Format,G),
charsio:peek_mem_write_stream(W, [], String),
close(W).
'$write_goal_output'(var([V|VL]), First, [var([V|VL])|L], next, L) :-
( First = first -> true ; format(user_error,',~n',[]) ),
format(user_error,'~s',[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,'~s',[V]),
'$write_output_vars'(VL),
format(user_error,' = ', []),
( recorded('$print_options','$toplevel'(Opts),_) ->
write_term(user_error,B,Opts) ;
format(user_error,'~w',[B])
).
'$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])
).
'$name_vars_in_goals'(G, VL0, NG) :-
copy_term_nat(G+VL0, NG+NVL0),
'$name_well_known_vars'(NVL0),
'$variables_in_term'(NG, [], NGVL),
'$name_vars_in_goals1'(NGVL, 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'(['$VAR'([95|Name])|NGVL], I0, IF) :-
I is I0+1,
'$gen_name_string'(I0,[],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'([]).
'$write_output_vars'([V|VL]) :-
format(user_error,' = ~s',[V]),
'$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) :-
yap_hacks:current_choice_point(CP),
'$call'(G, CP, G, M).
','(X,Y) :-
yap_hacks:env_choice_point(CP),
'$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) :- '$$cut_by'(CP).
%
% do it in ISO mode.
%
'$meta_call'(G,_ISO,M) :-
'$iso_check_goal'(G,G),
yap_hacks:current_choice_point(CP),
'$call'(G, CP, G, M).
'$meta_call'(G, CP, G0, M) :-
'$call'(G, CP, G0, M).
'$call'(G, CP, G0, _, M) :- /* iso version */
'$iso_check_goal'(G,G0),
'$call'(G, CP, G0, M).
'$call'(M:_,_,G0,_) :- var(M), !,
'$do_error'(instantiation_error,call(G0)).
'$call'(M:G,CP,G0,_) :- !,
'$call'(G,CP,G0,M).
'$call'((X,Y),CP,G0,M) :- !,
'$call'(X,CP,G0,M),
'$call'(Y,CP,G0,M).
'$call'((X->Y),CP,G0,M) :- !,
(
'$call'(X,CP,G0,M)
->
'$call'(Y,CP,G0,M)
).
'$call'((X->Y; Z),CP,G0,M) :- !,
(
'$call'(X,CP,G0,M)
->
'$call'(Y,CP,G0,M)
;
'$call'(Z,CP,G0,M)
).
'$call'((A;B),CP,G0,M) :- !,
(
'$call'(A,CP,G0,M)
;
'$call'(B,CP,G0,M)
).
'$call'((X->Y| Z),CP,G0,M) :- !,
(
'$call'(X,CP,G0,M)
->
'$call'(Y,CP,G0,M)
;
'$call'(Z,CP,G0,M)
).
'$call'((A|B),CP, G0,M) :- !,
(
'$call'(A,CP,G0,M)
;
'$call'(B,CP,G0,M)
).
'$call'(\+ X, _CP, _G0, M) :- !,
\+ '$execute'(M:X).
'$call'(not(X), _CP, _G0, M) :- !,
\+ '$execute'(M:X).
'$call'(!, CP, _,_) :- !,
'$$cut_by'(CP).
'$call'([A|B], _, _, M) :- !,
'$csult'([A|B], M).
'$call'(G, CP, G0, CurMod) :-
( '$is_expand_goal_or_meta_predicate'(G,CurMod) ->
(
user:goal_expansion(G, CurMod, NG) ->
'$call'(NG, CP, G0,CurMod)
;
% repeat other code.
'$is_metapredicate'(G,CurMod) ->
(
'$meta_expansion'(CurMod,CurMod,G,NG,[]) ->
'$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
'$undefp'([M|G]) :-
% make sure we do not loop on undefined predicates
% for undefined_predicates.
'$enter_undefp',
'$find_undefp_handler'(G,M,Goal,NM), !,
'$execute0'(Goal,NM).
'$find_undefp_handler'(G,M,G,S) :-
functor(G,F,N),
recorded('$import','$import'(S,M,F,N),_),
S \= M, % can't try importing from the module itself.
!,
'$exit_undefp'.
/*
'$find_undefp_handler'(G,M,NG,M) :-
'$is_expand_goal_or_meta_predicate'(G,M),
'$system_catch'(goal_expansion(G, M, NG), user, _, fail), !,
'$exit_undefp'.
*/
'$find_undefp_handler'(G,M,NG,user) :-
\+ '$undefined'(unknown_predicate_handler(_,_,_), user),
'$system_catch'(unknown_predicate_handler(G,M,NG), user, Error, '$leave_undefp'(Error)), !,
'$exit_undefp'.
'$find_undefp_handler'(G,M,US,user) :-
recorded('$unknown','$unknown'(M:G,US),_), !,
'$exit_undefp'.
'$find_undefp_handler'(_,_,_,_) :-
'$exit_undefp',
fail.
'$leave_undefp'(Ball) :-
'$exit_undefp',
throw(Ball).
/* This is the break predicate,
it saves the importante data about current streams and
debugger state */
break :-
nb_getval('$trace',Trace),
nb_setval('$trace',off),
nb_getval('$debug',Debug),
nb_setval('$debug',off),
nb_getval('$break',BL), NBL is BL+1,
nb_getval('$spy_gn',SPY_GN),
b_getval('$spy_glist',GList),
b_setval('$spy_glist',[]),
nb_setval('$break',NBL),
current_output(OutStream), current_input(InpStream),
format(user_error, '% Break (level ~w)~n', [NBL]),
'$do_live',
!,
set_value('$live','$true'),
b_setval('$spy_glist',GList),
nb_setval('$spy_gn',SPY_GN),
'$set_input'(InpStream), '$set_output'(OutStream),
nb_setval('$debug',Debug),
nb_setval('$trace',Trace),
nb_setval('$break',BL).
'$silent_bootstrap'(F) :-
'$allocate_default_arena'(1024, 64),
get_value('$lf_verbose',OldSilent),
set_value('$lf_verbose',silent),
bootstrap(F),
set_value('$lf_verbose', OldSilent).
bootstrap(F) :-
'$open'(F,'$csult',Stream,0,0),
'$current_stream'(File,_,Stream),
'$start_consult'(consult, File, LC),
file_directory_name(File, Dir),
getcwd(OldD),
cd(Dir),
(
get_value('$lf_verbose',silent)
->
true
;
H0 is heapused, '$cputime'(T0,_),
format(user_error, '~*|% consulting ~w...~n', [LC,F])
),
'$loop'(Stream,consult),
cd(OldD),
'$end_consult',
(
get_value('$lf_verbose',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).
'$loop'(Stream,Status) :-
'$change_alias_to_stream'('$loop_stream',Stream),
repeat,
( '$current_stream'(_,_,Stream) -> true
; '$abort_loop'(Stream)
),
prompt('| '), prompt(_,'| '),
'$current_module'(OldModule),
'$system_catch'('$enter_command'(Stream,Status), OldModule, Error,
user:'$LoopError'(Error, Status)),
!.
'$enter_command'(Stream,Status) :-
'$read_vars'(Stream,Command,_,_,Vars),
'$command'(Command,Vars,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).
'$check_head'(_,_).
% Path predicates
'$exists'(F,Mode) :-
get_value(fileerrors,V),
set_value(fileerrors,0),
( '$open'(F,Mode,S,0,1) -> '$close'(S), set_value(fileerrors,V) ; set_value(fileerrors,V), fail).
% This sequence must be followed:
% user and user_input are special;
% library(F) must check library_directories
% T(F) must check file_search_path
% all must try search in path
'$find_in_path'(user,user_input, _) :- !.
'$find_in_path'(user_input,user_input, _) :- !.
'$find_in_path'(library(File),NewFile, _) :-
'$dir_separator'(D),
atom_codes(A,[D]),
user:library_directory(Dir),
'$extend_path'(Dir, A, File, NFile, compile(library(File))),
'$search_in_path'(NFile, NewFile), !.
'$find_in_path'(S,NewFile, _) :-
S =.. [Name,File], !,
'$dir_separator'(D),
atom_codes(A,[D]),
user:file_search_path(Name, Dir),
'$extend_path'(Dir, A, File, NFile, compile(S)),
'$search_in_path'(NFile, NewFile), !.
'$find_in_path'(File,NewFile,_) :- atom(File), !,
'$search_in_path'(File,NewFile),!.
'$find_in_path'(File,_,Call) :-
'$do_error'(domain_error(source_sink,File),Call).
'$search_in_path'(New,New) :-
'$exists'(New,'$csult'), !.
'$search_in_path'(File,New) :-
recorded('$path',Path,_),
atom_concat([Path,File],New),
'$exists'(New,'$csult').
'$extend_path'(Dir, A, File, NFile, _) :-
atom(Dir), !,
atom_concat([Dir,A,File],NFile).
'$extend_path'(Name, A, File, NFile, Goal) :-
nonvar(Name),
Name =.. [_,_],
'$find_in_path'(Name, Path, Goal),
'$extend_path'(Path, A, File, NFile, Goal).
% term expansion
%
% return two arguments: Expanded0 is the term after "USER" expansion.
% Expanded is the final expanded term.
%
'$precompile_term'(Term, Expanded0, Expanded, Mod) :-
(
'$access_yap_flags'(9,1) /* strict_iso on */
->
'$expand_term_modules'(Term, Expanded0, Expanded, Mod),
'$check_iso_strict_clause'(Expanded0)
;
'$expand_term_modules'(Term, Expanded0, ExpandedI, Mod),
'$expand_array_accesses_in_term'(ExpandedI,Expanded)
).
expand_term(Term,Expanded) :-
( \+ '$undefined'(term_expansion(_,_), user),
user:term_expansion(Term,Expanded)
;
'$expand_term_grammar'(Term,Expanded)
),
!.
%
% Grammar Rules expansion
%
'$expand_term_grammar'((A-->B), C) :-
'$translate_rule'((A-->B),C), !.
'$expand_term_grammar'(A, A).
%
% Arithmetic expansion
%
'$expand_term_arith'(G1, G2) :-
get_value('$c_arith',true),
'$c_arith'(G1, G2), !.
'$expand_term_arith'(G,G).
%
% Arithmetic expansion
%
'$expand_array_accesses_in_term'(Expanded0,ExpandedF) :-
'$array_refs_compiled',
'$c_arrays'(Expanded0,ExpandedF), !.
'$expand_array_accesses_in_term'(Expanded,Expanded).
%
% Module system expansion
%
'$expand_term_modules'(A,B,C,M) :- '$module_expansion'(A,B,C,M), !.
'$expand_term_modules'(A,A,A,_).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% catch/throw implementation
% at each catch point I need to know:
% what is ball;
% where was the previous catch
catch(G, C, A) :-
'$catch'(C,A,_),
'$execute'(G).
% system_catch is like catch, but it avoids the overhead of a full
% meta-call by calling '$execute0' instead of $execute.
% This way it
% also avoids module preprocessing and goal_expansion
%
'$system_catch'(G, M, C, A) :-
% check current trail
'$catch'(C,A,_),
'$execute_nonstop'(G, M).
%
% throw has to be *exactly* after system catch!
%
throw(Ball) :-
% get this off the unwound computation.
copy_term(Ball,NewBall),
% get current jump point
'$jump_env_and_store_ball'(NewBall).
% just create a choice-point
'$catch'(_,_,_).
'$catch'(_,_,_) :- fail.
'$handle_throw'(_, _, _).
'$handle_throw'(C, A, Ball) :-
% reset info
(Ball \== '$abort', C = Ball ->
'$execute'(A)
;
throw(Ball)
).
'$run_toplevel_hooks' :-
nb_getval('$break',0),
recorded('$toplevel_hooks',H,_), !,
( '$execute'(H) -> true ; true).
'$run_toplevel_hooks'.
'$enter_system_mode' :-
nb_setval('$system_mode',on).
'$exit_system_mode' :-
nb_setval('$system_mode',off),
( nb_getval('$trace',on) -> '$creep' ; true).