/************************************************************************* * * * YAP Prolog * * * * Yap Prolog was developed at NCCUP - Universidade do Porto * * * * Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 * * * ************************************************************************** * * * File: utils.yap * * Last rev: 8/2/88 * * mods: * * comments: Some utility predicates available in yap * * * *************************************************************************/ once(G) :- '$execute'(G), !. if(X,Y,_Z) :- CP is '$last_choice_pt', '$execute'(X), '$clean_ifcp'(CP), '$execute'(Y). if(_X,_Y,Z) :- '$execute'(Z). call_with_args(M:V) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V)). call_with_args(M:A) :- !, '$call_with_args'(A,M). call_with_args(A) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,M). call_with_args(A) :- '$do_error'(type_error(atom,A),call_with_args(A)). call_with_args(M:V,A1) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1)). call_with_args(M:A,A1) :- !, '$call_with_args'(A,A1,M). call_with_args(A,A1) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,M). call_with_args(A,A1) :- '$do_error'(type_error(atom,A),call_with_args(A,A1)). call_with_args(M:V,A1,A2) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2)). call_with_args(M:A,A1,A2) :- !, '$call_with_args'(A,A1,A2,M). call_with_args(A,A1,A2) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,M). call_with_args(A,A1,A2) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2)). call_with_args(M:V,A1,A2,A3) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3)). call_with_args(M:A,A1,A2,A3) :- !, '$call_with_args'(A,A1,A2,A3,M). call_with_args(A,A1,A2,A3) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,M). call_with_args(A,A1,A2,A3) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3)). call_with_args(M:V,A1,A2,A3,A4) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4)). call_with_args(M:A,A1,A2,A3,A4) :- !, '$call_with_args'(A,A1,A2,A3,A4,M). call_with_args(A,A1,A2,A3,A4) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,A4,M). call_with_args(A,A1,A2,A3,A4) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4)). call_with_args(M:V,A1,A2,A3,A4,A5) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5)). call_with_args(M:A,A1,A2,A3,A4,A5) :- !, '$call_with_args'(A,A1,A2,A3,A4,A5,M). call_with_args(A,A1,A2,A3,A4,A5) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,A4,A5,M). call_with_args(A,A1,A2,A3,A4,A5) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5)). call_with_args(M:V,A1,A2,A3,A4,A5,A6) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6)). call_with_args(M:A,A1,A2,A3,A4,A5,A6) :- !, '$call_with_args'(A,A1,A2,A3,A4,A5,A6,M). call_with_args(A,A1,A2,A3,A4,A5,A6) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,A4,A5,A6,M). call_with_args(A,A1,A2,A3,A4,A5,A6) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6)). call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7)). call_with_args(M:A,A1,A2,A3,A4,A5,A6,A7) :- !, '$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,M). call_with_args(A,A1,A2,A3,A4,A5,A6,A7) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,M). call_with_args(A,A1,A2,A3,A4,A5,A6,A7) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6,A7)). call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8)). call_with_args(M:A,A1,A2,A3,A4,A5,A6,A7,A8) :- !, '$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,M). call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,M). call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8)). call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8,A9) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8,A9)). call_with_args(M:A,A1,A2,A3,A4,A5,A6,A7,A8,A9) :- !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,M). call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,M). call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9)). call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :- var(V), !, '$do_error'(instantiation_error,call_with_args(M:V,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10)). call_with_args(M:A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :- !, '$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,M). call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :- atom(A), !, '$current_module'(M), '$call_with_args'(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,M). call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10) :- '$do_error'(type_error(atom,A),call_with_args(A,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10)). op(P,T,V) :- var(P), !, '$do_error'(instantiation_error,op(P,T,V)). op(P,T,V) :- \+integer(P), !, '$do_error'(type_error(integer,P),op(P,T,V)). op(P,T,V) :- (P < 0 ; P > 1200), !, '$do_error'(domain_error(operator_priority,P),op(P,T,V)). op(P,T,V) :- var(T), !, '$do_error'(instantiation_error,op(P,T,V)). op(P,T,V) :- \+atom(T), !, '$do_error'(type_error(atom,T),op(P,T,V)). op(P,T,V) :- var(V), !, '$do_error'(instantiation_error,op(P,T,V)). op(P,T,V) :- \+ atom(V), \+ '$check_list_of_operators'(V, op(P,T,V)), '$do_error'(type_error(list,V),op(P,T,V)). op(P,T,V) :- '$op2'(P,T,V). '$check_list_of_operators'(V, T) :- var(V), !, '$do_error'(instantiation_error,T). '$check_list_of_operators'([], _). '$check_list_of_operators'([H|L], T) :- '$check_if_operator'(H,T), '$check_list_of_operators'(L, T). '$check_if_operator'(H,T) :- var(H), !, '$do_error'(instantiation_error,T). '$check_if_operator'(H,_) :- atom(H), !. '$check_if_operator'(H,T) :- '$do_error'(type_error(atom,H),T). '$op2'(_,_,[]) :- !. '$op2'(P,T,[A|L]) :- !, '$op'(P,T,A), '$op2'(P,T,L). '$op2'(P,T,A) :- atom(A), '$op'(P,T,A). '$op'(P,T,',') :- !, '$do_error'(permission_error(modify,operator,','),op(P,T,',')). '$op'(P,T,A) :- '$opdec'(P,T,A). %%% Operating System utilities cd(A) :- atom(A), !, atom_codes(A,S), '$cd'(S). cd(S) :- '$cd'(S). getcwd(D) :- '$getcwd'(SD), atom_codes(D, SD). system(A) :- atom(A), !, atom_codes(A,S), '$system'(S). system(S) :- '$system'(S). rename(Old,New) :- atom(Old), atom(New), !, name(Old,SOld), name(New,SNew), '$rename'(SOld,SNew). unix(V) :- var(V), !, '$do_error'(instantiation_error,unix(V)). unix(argv(L)) :- '$is_list_of_atoms'(L,L), !, '$argv'(L). unix(argv(V)) :- '$do_error'(type_error(atomic,V),unix(argv(V))). unix(cd) :- cd('~'). unix(cd(V)) :- var(V), !, '$do_error'(instantiation_error,unix(cd(V))). unix(cd(A)) :- atomic(A), !, cd(A). unix(cd(V)) :- '$do_error'(type_error(atomic,V),unix(cd(V))). unix(environ(X,Y)) :- '$do_environ'(X,Y). unix(getcwd(X)) :- getcwd(X). unix(shell(V)) :- var(V), !, '$do_error'(instantiation_error,unix(shell(V))). unix(shell(A)) :- atomic(A), !, '$shell'(A). unix(shell(V)) :- '$do_error'(type_error(atomic,V),unix(shell(V))). unix(system(V)) :- var(V), !, '$do_error'(instantiation_error,unix(system(V))). unix(system(A)) :- atomic(A), !, system(A). unix(system(V)) :- '$do_error'(type_error(atom,V),unix(system(V))). unix(shell) :- sh. unix(putenv(X,Y)) :- '$putenv'(X,Y). '$is_list_of_atoms'(V,_) :- var(V),!. '$is_list_of_atoms'([],_) :- !. '$is_list_of_atoms'([H|L],L0) :- !, '$check_if_head_may_be_atom'(H,L0), '$is_list_of_atoms'(L,L0). '$is_list_of_atoms'(H,L0) :- '$do_error'(type_error(list,H),unix(argv(L0))). '$check_if_head_may_be_atom'(H,L0) :- var(H), !. '$check_if_head_may_be_atom'(H,L0) :- atom(H), !. '$check_if_head_may_be_atom'(H,L0) :- '$do_error'(type_error(atom,H),unix(argv(L0))). '$do_environ'(X, Y) :- var(X), !, '$do_error'(instantiation_error,unix(environ(X,Y))). '$do_environ'(X, Y) :- atom(X), !, '$getenv'(X,Y). '$do_environ'(X, Y) :- '$do_error'(type_error(atom,X),unix(environ(X,Y))). putenv(Na,Val) :- '$putenv'(Na,Val). getenv(Na,Val) :- '$getenv'(Na,Val). alarm(_, _, _) :- recorded('$alarm_handler',_, Ref), erase(Ref), fail. alarm(Interval, Goal, Left) :- '$current_module'(M), '$recordz'('$alarm_handler',M:Goal,_), '$alarm'(Interval, Left). on_signal(Signal,OldAction,default) :- recorded('$sig_handler', default(Signal,Action), _Ref), on_signal(Signal,OldAction,Action). on_signal(Signal,OldAction,Action) :- recorded('$sig_handler', action(Signal,OldAction), Ref), erase(Ref), '$current_module'(M), '$recordz'('$sig_handler', action(Signal,M:Action), _). %%% Saving and restoring a computation save(A) :- var(A), !, '$do_error'(instantiation_error,save(A)). save(A) :- atom(A), !, name(A,S), '$save'(S). save(S) :- '$save'(S). save(A,_) :- var(A), !, '$do_error'(instantiation_error,save(A)). save(A,OUT) :- atom(A), !, name(A,S), '$save'(S,OUT). save(S,OUT) :- '$save'(S,OUT). save_program(A) :- var(A), !, '$do_error'(instantiation_error,save_program(A)). save_program(A) :- atom(A), !, name(A,S), '$save_program'(S). save_program(S) :- '$save_program'(S). save_program(A, G) :- var(A), !, '$do_error'(instantiation_error,save_program(A,G)). save_program(A, G) :- var(G), !, '$do_error'(instantiation_error,save_program(A,G)). save_program(A, G) :- \+ callable(G), !, '$do_error'(type_error(callable,G),save_program(A,G)). save_program(A, G) :- ( atom(A) -> name(A,S) ; A = S), '$recorda'('$restore_goal',G,R), '$save_program'(S), erase(R), fail. save_program(_,_). restore(A) :- var(A), !, '$do_error'(instantiation_error,restore(A)). restore(A) :- atom(A), !, name(A,S), '$restore'(S). restore(S) :- '$restore'(S). %%% Data base predicates -> the interface to the external world recorda(Key,Term,Ref) :- '$recorda'(Key,Term,Ref). recordz(Key,Term,Ref) :- '$recordz'(Key,Term,Ref). recordaifnot(Key,Term,Ref) :- '$recordaifnot'(Key,Term,Ref). recordzifnot(Key,Term,Ref) :- '$recordzifnot'(Key,Term,Ref). %%% Atoms with value get_value(X,Y) :- '$get_value'(X,Y). set_value(X,Y) :- '$set_value'(X,Y). %%% current .... current_atom(A) :- % check atom(A), !. current_atom(A) :- % generate '$current_atom'(A). current_predicate(A,T) :- var(T), !, % only for the predicate '$current_module'(M), '$current_predicate_no_modules'(M,A,T). current_predicate(A,M:T) :- % module specified var(M), !, current_module(M), M \= prolog, '$current_predicate_no_modules'(M,A,T). current_predicate(A,M:T) :- % module specified nonvar(T), !, functor(T,A,_), '$pred_exists'(T,M). current_predicate(A,M:T) :- % module specified !, '$current_predicate_no_modules'(M,A,T). current_predicate(A,T) :- % only for the predicate '$current_module'(M), '$current_predicate_no_modules'(M,A,T). current_predicate(F) :- var(F), !, % only for the predicate '$current_module'(M), '$current_predicate3'(M,F). current_predicate(M:F) :- % module specified var(M), !, '$current_module'(M), M \= prolog, '$current_predicate3'(M,F). current_predicate(M:F) :- % module specified !, '$current_predicate3'(M,F). current_predicate(S) :- % only for the predicate '$current_module'(M), '$current_predicate3'(M,S). system_predicate(A,P) :- '$current_predicate_no_modules'(prolog,A,P), \+ '$hidden'(A). system_predicate(P) :- '$current_module'(M), '$system_predicate'(P,M). '$current_predicate_no_modules'(M,A,T) :- '$current_predicate'(M,A,Arity), \+ '$hidden'(A), functor(T,A,Arity), '$pred_exists'(T,M). '$current_predicate3'(M,A/Arity) :- !, '$current_predicate'(M,A,Arity), \+ '$hidden'(A), functor(T,A,Arity), '$pred_exists'(T,M). '$current_predicate3'(M,BadSpec) :- % only for the predicate '$do_error'(type_error(predicate_indicator,BadSpec),current_predicate(M:BadSpec)). %%% User interface for statistics statistics :- '$runtime'(Runtime,_), '$cputime'(CPUtime,_), '$walltime'(Walltime,_), '$statistics_heap_info'(HpSpa, HpInUse), '$statistics_heap_max'(HpMax), '$statistics_trail_info'(TrlSpa, TrlInUse), '$statistics_trail_max'(TrlMax), '$statistics_stacks_info'(StkSpa, GlobInU, LocInU), '$statistics_global_max'(GlobMax), '$statistics_local_max'(LocMax), '$inform_heap_overflows'(NOfHO,TotHOTime), '$inform_stack_overflows'(NOfSO,TotSOTime), '$inform_trail_overflows'(NOfTO,TotTOTime), '$inform_gc'(NOfGC,TotGCTime,TotGCSize), '$inform_agc'(NOfAGC,TotAGCTime,TotAGCSize), '$statistics'(Runtime,CPUtime,Walltime,HpSpa,HpInUse,HpMax,TrlSpa, TrlInUse,TrlMax,StkSpa, GlobInU, LocInU,GlobMax,LocMax,NOfHO,TotHOTime,NOfSO,TotSOTime,NOfTO,TotTOTime,NOfGC,TotGCTime,TotGCSize,NOfAGC,TotAGCTime,TotAGCSize). '$statistics'(Runtime,CPUtime,Walltime,HpSpa,HpInUse,_HpMax,TrlSpa, TrlInUse,_TrlMax,StkSpa, GlobInU, LocInU,GlobMax,LocMax,NOfHO,TotHOTime,NOfSO,TotSOTime,NOfTO,TotTOTime,NOfGC,TotGCTime,TotGCSize,NOfAGC,TotAGCTime,TotAGCSize) :- TotalMemory is HpSpa+StkSpa+TrlSpa, '$format'(user_error,"memory (total)~t~d bytes~35+~n", [TotalMemory]), '$format'(user_error," program space~t~d bytes~35+", [HpSpa]), '$format'(user_error,":~t ~d in use~19+", [HpInUse]), HpFree is HpSpa-HpInUse, '$format'(user_error,",~t ~d free~19+~n", [HpFree]), '$format'(user_error," stack space~t~d bytes~35+", [StkSpa]), StackInUse is GlobInU+LocInU, '$format'(user_error,":~t ~d in use~19+", [StackInUse]), StackFree is StkSpa-StackInUse, '$format'(user_error,",~t ~d free~19+~n", [StackFree]), '$format'(user_error," global stack:~t~35+", []), '$format'(user_error," ~t ~d in use~19+", [GlobInU]), '$format'(user_error,",~t ~d max~19+~n", [GlobMax]), '$format'(user_error," local stack:~t~35+", []), '$format'(user_error," ~t ~d in use~19+", [LocInU]), '$format'(user_error,",~t ~d max~19+~n", [LocMax]), '$format'(user_error," trail stack~t~d bytes~35+", [TrlSpa]), '$format'(user_error,":~t ~d in use~19+", [TrlInUse]), TrlFree is TrlSpa-TrlInUse, '$format'(user_error,",~t ~d free~19+~n", [TrlFree]), OvfTime is TotHOTime+TotSOTime+TotTOTime, '$format'(user_error,"~n~t~3f~12+ sec. for ~w code, ~w stack, and ~w trail space overflows~n", [OvfTime,NOfHO,NOfSO,NOfTO]), TotGCTimeF is float(TotGCTime)/1000, '$format'(user_error,"~t~3f~12+ sec. for ~w garbage collections which collected ~d bytes~n", [TotGCTimeF,NOfGC,TotGCSize]), TotAGCTimeF is float(TotAGCTime)/1000, '$format'(user_error,"~t~3f~12+ sec. for ~w atom garbage collections which collected ~d bytes~n", [TotAGCTimeF,NOfAGC,TotAGCSize]), RTime is float(Runtime)/1000, '$format'(user_error,"~t~3f~12+ sec. runtime~n", [RTime]), CPUTime is float(CPUtime)/1000, '$format'(user_error,"~t~3f~12+ sec. cputime~n", [CPUTime]), WallTime is float(Walltime)/1000, '$format'(user_error,"~t~3f~12+ sec. elapsed time~n~n", [WallTime]), fail. '$statistics'(_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_). statistics(runtime,[T,L]) :- '$runtime'(T,L). statistics(cputime,[T,L]) :- '$cputime'(T,L). statistics(walltime,[T,L]) :- '$walltime'(T,L). %statistics(core,[_]). %statistics(memory,[_]). statistics(heap,[Hp,HpF]) :- '$statistics_heap_info'(HpM, Hp), HpF is HpM-Hp. statistics(program,Info) :- statistics(heap,Info). statistics(global_stack,[GlobInU,GlobFree]) :- '$statistics_stacks_info'(StkSpa, GlobInU, LocInU), GlobFree is StkSpa-GlobInU-LocInU. statistics(local_stack,[LocInU,LocFree]) :- '$statistics_stacks_info'(StkSpa, GlobInU, LocInU), LocFree is StkSpa-GlobInU-LocInU. statistics(trail,[TrlInUse,TrlFree]) :- '$statistics_trail_info'(TrlSpa, TrlInUse), TrlFree is TrlSpa-TrlInUse. statistics(garbage_collection,[NOfGC,TotGCSize,TotGCTime]) :- '$inform_gc'(NOfGC,TotGCTime,TotGCSize). statistics(stack_shifts,[NOfHO,NOfSO,NOfTO]) :- '$inform_heap_overflows'(NOfHO,_), '$inform_stack_overflows'(NOfSO,_), '$inform_trail_overflows'(NOfTO,_). %%% The unknown predicate, % informs about what the user wants to be done when % there are no clauses for a certain predicate */ unknown(V0,V) :- '$current_module'(M), '$unknown'(V0,V,M). % query mode '$unknown'(V0,V,_) :- var(V), !, '$ask_unknown_flag'(V), V = V0. % handle modules. '$unknown'(V0,Mod:Handler,_) :- '$unknown'(V0,Handler,Mod). % check if we have one we like. '$unknown'(_,New,Mod) :- '$valid_unknown_handler'(New,Mod), fail. % clean up previous unknown predicate handlers '$unknown'(Old,New,Mod) :- '$recorded'('$unknown','$unknown'(_,MyOld),Ref), !, erase(Ref), '$cleanup_unknown_handler'(MyOld,Old), '$new_unknown'(New, Mod). % store the new one. '$unknown'(fail,New,Mod) :- '$new_unknown'(New, Mod). '$valid_unknown_handler'(V,_) :- var(V), !, '$do_error'(instantiation_error,yap_flag(unknown,V)). '$valid_unknown_handler'(fail,_) :- !. '$valid_unknown_handler'(error,_) :- !. '$valid_unknown_handler'(warning,_) :- !. '$valid_unknown_handler'(S,M) :- functor(S,_,1), arg(1,S,A), var(A), \+ '$undefined'(S,M), !. '$valid_unknown_handler'(S,_) :- '$do_error'(domain_error(flag_value,unknown+S),yap_flag(unknown,S)). '$ask_unknown_flag'(Old) :- '$recorded'('$unknown','$unkonwn'(_,MyOld),_), !, '$cleanup_unknwon_handler'(MyOld,Old). '$ask_unknown_flag'(fail). '$cleanup_unknown_handler'('$unknown_error'(_),error) :- !. '$cleanup_unknown_handler'('$unknown_warning'(_),warning) :- !. '$cleanup_unknown_handler'(Handler, Handler). '$new_unknown'(fail,_) :- !. '$new_unknown'(error,_) :- !, '$recorda'('$unknown','$unknown'(P,'$unknown_error'(P)),_). '$new_unknown'(warning,_) :- !, '$recorda'('$unknown','$unknown'(P,'$unknown_warning'(P)),_). '$new_unknown'(X,M) :- arg(1,X,A), '$recorda'('$unknown','$unknown'(A,M:X),_). '$unknown_error'(P) :- '$do_error'(unknown,P). '$unknown_warning'(P) :- P=M:F, functor(F,Na,Ar), '$format'(user_error,"[ EXISTENCE ERROR: ~w, procedure ~w:~w/~w undefined ]~n", [P,M,Na,Ar]), fail. predicate_property(Mod:Pred,Prop) :- !, '$predicate_property2'(Pred,Prop,Mod). predicate_property(Pred,Prop) :- '$current_module'(Mod), '$predicate_property2'(Pred,Prop,Mod). '$predicate_property2'(Pred,Prop,M) :- var(Pred), !, '$generate_all_preds_from_mod'(Pred, SourceMod, M), '$predicate_property'(Pred,SourceMod,M,Prop). '$predicate_property2'(M:Pred,Prop,_) :- !, '$predicate_property2'(Pred,Prop,M). '$predicate_property2'(Pred,Prop,Mod) :- '$pred_exists'(Pred,Mod), !, '$predicate_property'(Pred,Mod,Mod,Prop). '$predicate_property2'(Pred,Prop,Mod) :- functor(Pred, N, K), '$recorded'('$import','$import'(M,Mod,N,K),_), '$predicate_property'(Pred,M,Mod,Prop). '$generate_all_preds_from_mod'(Pred, M, M) :- '$current_predicate'(M,Na,Ar), functor(Pred, Na, Ar). '$generate_all_preds_from_mod'(Pred, SourceMod, Mod) :- '$recorded'('$import','$import'(SourceMod,Mod,N,K),_), functor(Pred, N, K). '$predicate_property'(P,M,_,built_in) :- '$system_predicate'(P,M), !. '$predicate_property'(P,M,_,source) :- ( '$recordedp'(M:P,_,_) -> true ; false). '$predicate_property'(P,M,_,dynamic) :- '$is_dynamic'(P,M). '$predicate_property'(P,M,_,static) :- \+ '$is_dynamic'(P,M), \+ '$undefined'(P,M). '$predicate_property'(P,M,_,meta_predicate(P)) :- functor(P,Na,Ar), user:'$meta_predicate'(M,Na,Ar,P). '$predicate_property'(P,M,_,multifile) :- '$is_multifile'(P,M). '$predicate_property'(P,Mod,M,imported_from(Mod)) :- functor(P,N,K), '$recorded'('$import','$import'(Mod,M,N,K),_). '$predicate_property'(P,M,_,public) :- '$is_public'(P,M). '$predicate_property'(P,M,M,exported) :- functor(P,N,A), '$recorded'('$module','$module'(_TFN,M,Publics),_), '$member'(N/A,Publics), !. /* defined in modules.yap */ %%% Some "dirty" predicates % Only efective if yap compiled with -DDEBUG % this predicate shows the code produced by the compiler '$show_code' :- '$debug'(0'f). '$pred_exists'(Pred,M) :- '$is_dynamic'(Pred,M), !. '$pred_exists'(Pred,M) :- \+ '$undefined'(Pred,M). grow_heap(X) :- '$grow_heap'(X). grow_stack(X) :- '$grow_stack'(X). % % gc() expects to be called from "call". Make sure it has an % environment to return to. % %garbage_collect :- save(dump), '$gc', save(dump2). garbage_collect :- '$gc'. gc :- yap_flag(gc,on). nogc :- yap_flag(gc,off). garbage_collect_atoms :- '$atom_gc'. '$force_environment_for_gc'. '$good_list_of_character_codes'(V) :- var(V), !. '$good_list_of_character_codes'([]). '$good_list_of_character_codes'([X|L]) :- '$good_character_code'(X), '$good_list_of_character_codes'(L). '$good_character_code'(X) :- var(X), !. '$good_character_code'(X) :- integer(X), X > -2, X < 256. atom_concat(X,Y,At) :- atom(At), !, atom_length(At,Len), '$atom_contact_split'(At,0,Len,X,Y). /* Let atom_chars do our error handling */ atom_concat(X,Y,At) :- atom_codes(X,S1), atom_codes(Y,S2), '$append'(S1,S2,S), atom_codes(At,S). '$atom_contact_split'(At,Len,Len,X,Y) :- !, '$atom_split'(At,Len,X,Y). '$atom_contact_split'(At,Len1,_,X,Y) :- '$atom_split'(At,Len1,X,Y). '$atom_contact_split'(At,Len1,Len,X,Y) :- Len2 is Len1+1, '$atom_contact_split'(At,Len2,Len,X,Y). sub_atom(At, Bef, Size, After, SubAt) :- var(At), !, '$do_error'(instantiation_error,sub_atom(At, Bef, Size,After, SubAt)). sub_atom(At, Bef, Size, After, SubAt) :- \+ atom(At), !, '$do_error'(type_error(atom,At),sub_atom(At, Bef, Size,After, SubAt)). sub_atom(At, Bef, Size, After, SubAt) :- nonvar(SubAt), \+ atom(SubAt), !, '$do_error'(type_error(atom,SubAt),sub_atom(At, Bef, Size,After, SubAt)). sub_atom(At, Bef, Size, After, SubAt) :- '$check_type_sub_atom'(Bef, sub_atom(At, Bef, Size,After, SubAt)), '$check_type_sub_atom'(Size, sub_atom(At, Bef, Size,After, SubAt)), '$check_type_sub_atom'(After, sub_atom(At, Bef, Size,After, SubAt)), atom_codes(At, Atl), '$$_length1'(Atl,0,Len), '$split_len_in_parts'(Atl, Len, Bef, Size, After, SubAtl), atom_codes(SubAt, SubAtl). '$check_type_sub_atom'(I, _) :- var(I), !. '$check_type_sub_atom'(I, P) :- integer(I), I < 0, !, '$do_error'(domain_error(not_less_than_zero,I),P). '$check_type_sub_atom'(I, P) :- \+ integer(I), !, '$do_error'(type_error(integer,I),P). '$check_type_sub_atom'(_, _). '$split_len_in_parts'(Atl, Len, Bef, Size, After, SubAt) :- var(Bef), !, '$range_var'(0, Len, Bef), '$split_len_in_parts2'(Atl, Len, Bef, Size, After, SubAt). '$split_len_in_parts'(Atl, Len, Bef, Size, After, SubAt) :- '$split_len_in_parts2'(Atl, Len, Bef, Size, After, SubAt). '$split_len_in_parts2'(Atl, Len, 0, Size, After, SubAt) :- !, '$split_len_in_parts3'(Atl, Len, Size, After, SubAt). '$split_len_in_parts2'([_|Atl], Len0, Bef0, Size, After, SubAt) :- Bef is Bef0-1 , Len is Len0-1, '$split_len_in_parts2'(Atl, Len, Bef, Size, After, SubAt). '$split_len_in_parts3'(Atl, Len, Size, After, SubAt) :- var(Size), !, '$range_var'(0, Len, Size), '$split_len_in_parts4'(Atl, Len, Size, After, SubAt). '$split_len_in_parts3'(Atl, Len, Size, After, SubAt) :- '$split_len_in_parts4'(Atl, Len, Size, After, SubAt). '$split_len_in_parts4'(_, Len, 0, After, SubAt) :- !, After = Len, SubAt = []. '$split_len_in_parts4'([Code|Atl], Len0, Size0, After, [Code|SubAt]) :- Size is Size0-1, Len is Len0-1, '$split_len_in_parts4'(Atl, Len, Size, After, SubAt). '$range_var'(X,X,S) :- !, S = X. '$range_var'(X1,_,X1). '$range_var'(X1,X2,XF) :- X11 is X1+1, '$range_var'(X11,X2,XF). '$singletons_in_term'(T,VL) :- '$variables_in_term'(T,[],V10), '$sort'(V10, V1), '$non_singletons_in_term'(T,[],V20), '$sort'(V20, V2), '$subtract_lists_of_variables'(V2,V1,VL). '$subtract_lists_of_variables'([],VL,VL). '$subtract_lists_of_variables'([_|_],[],[]) :- !. '$subtract_lists_of_variables'([V1|VL1],[V2|VL2],VL) :- V1 == V2, !, '$subtract_lists_of_variables'(VL1,VL2,VL). '$subtract_lists_of_variables'([V1|VL1],[V2|VL2],[V2|VL]) :- '$subtract_lists_of_variables'([V1|VL1],VL2,VL). simple(V) :- var(V), !. simple(A) :- atom(A), !. simple(N) :- number(N). callable(V) :- var(V), !, fail. callable(V) :- atom(V), !. callable(V) :- functor(V,_,Ar), Ar > 0. initialization :- '$initialisation_goals'. prolog_initialization(G) :- var(G), !, '$do_error'(instantiation_error,initialization(G)). prolog_initialization(T) :- callable(T), !, '$assert_init'(T). prolog_initialization(T) :- '$do_error'(type_error(callable,T),initialization(T)). '$assert_init'(T) :- '$recordz'('$startup_goal',T,_), fail. '$assert_init'(_). version :- '$version'. version(V) :- var(V), !, '$do_error'(instantiation_error,version(V)). version(T) :- atom(T), !, '$assert_version'(T). version(T) :- '$do_error'(type_error(atom,T),version(T)). '$assert_version'(T) :- '$recordz'('$version',T,_), fail. '$assert_version'(_). term_variables(Term, L) :- '$variables_in_term'(Term, [], L). term_hash(X,Y) :- term_hash(X,-1,16'1000000,Y). % % allow users to define their own directives. % user_defined_directive(Dir,_) :- '$directive'(Dir), !. user_defined_directive(Dir,Action) :- functor(Dir,Na,Ar), functor(NDir,Na,Ar), '$current_module'(M, prolog), assert_static('$directive'(NDir)), assert_static(('$exec_directive'(Dir, _, _) :- Action)), '$current_module'(_, M). '$set_toplevel_hook'(_) :- '$recorded'('$toplevel_hooks',_,R), erase(R), fail. '$set_toplevel_hook'(H) :- '$recorda'('$toplevel_hooks',H,_), fail. '$set_toplevel_hook'(_). raise_exception(Ball) :- throw(Ball). on_exception(Pat, G, H) :- catch(G, Pat, H). '$append'([], L, L) . '$append'([H|T], L, [H|R]) :- '$append'(T, L, R).