660 lines
17 KiB
Prolog
660 lines
17 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: utils.yap *
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* Last rev: 8/2/88 *
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* mods: *
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* comments: Some utility predicates available in yap *
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* *
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*************************************************************************/
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op(P,T,V) :-
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'$check_op'(P,T,V,op(P,T,V)),
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'$op'(P, T, V).
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% just check the operator declarations for correctness.
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'$check_op'(P,T,Op,G) :-
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( var(P) ; var(T); var(Op)), !,
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'$do_error'(instantiation_error,G).
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'$check_op'(P,_,_,G) :-
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\+ integer(P), !,
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'$do_error'(type_error(integer,P),G).
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'$check_op'(P,_,_,G) :-
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P < 0, !,
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'$do_error'(domain_error(operator_priority,P),G).
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'$check_op'(P,_,_,G) :-
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P > 1200, !,
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'$do_error'(domain_error(operator_priority,P),G).
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'$check_op'(_,T,_,G) :-
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\+ atom(T), !,
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'$do_error'(type_error(atom,P),G).
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'$check_op'(_,T,_,G) :-
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\+ '$associativity'(T), !,
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'$do_error'(domain_error(operator_specifier,T),G).
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'$check_op'(P,T,V,G) :-
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'$check_module_for_op'(V, G, NV),
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'$check_top_op'(P, T, NV, G).
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'$check_top_op'(_, _, [], _).
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'$check_top_op'(P, T, Op.NV, G) :- !,
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'$check_ops'(P, T, Op.NV, G).
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'$check_top_op'(P, T, V, G) :-
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atom(V), !,
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'$check_op_name'(P, T, V, G).
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'$check_top_op'(P, T, V, G) :-
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'$do_error'(type_error(atom,V),G).
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'$associativity'(xfx).
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'$associativity'(xfy).
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'$associativity'(yfx).
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'$associativity'(yfy).
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'$associativity'(xf).
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'$associativity'(yf).
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'$associativity'(fx).
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'$associativity'(fy).
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'$check_module_for_op'(MOp, G, _) :-
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var(MOp), !,
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'$do_error'(instantiation_error,G).
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'$check_module_for_op'(M:V, G, _) :-
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var(M), !,
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'$do_error'(instantiation_error,G).
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'$check_module_for_op'(M:V, G, NV) :-
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atom(M), !,
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'$check_module_for_op'(V, G, NV).
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'$check_module_for_op'(M:V, G, _) :- !,
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'$do_error'(type_error(atom,P),G).
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'$check_module_for_op'(V, G, V).
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'$check_ops'(P, T, [], G) :- !.
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'$check_ops'(P, T, Op.NV, G) :- !,
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(
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var(NV)
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->
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'$do_error'(instantiation_error,G)
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;
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'$check_module_for_op'(Op, G, NOp),
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'$check_op_name'(P, T, NOp, G),
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'$check_ops'(P, T, NV, G)
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).
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'$check_ops'(P, T, Ops, G) :-
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'$do_error'(type_error(list,Ops),G).
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'$check_op_name'(_,_,V,G) :-
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var(V), !,
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'$do_error'(instantiation_error,G).
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'$check_op_name'(_,_,',',G) :- !,
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'$do_error'(permission_error(modify,operator,','),G).
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'$check_op_name'(_,_,'[]',G) :- !,
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'$do_error'(permission_error(create,operator,'[]'),G).
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'$check_op_name'(_,_,'{}',G) :- !,
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'$do_error'(permission_error(create,operator,'{}'),G).
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'$check_op_name'(P,T,'|',G) :-
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(
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integer(P),
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P < 1001, P > 0
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;
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atom_codes(T,[_,_])
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), !,
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'$do_error'(permission_error(create,operator,'|'),G).
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'$check_op_name'(_,_,V,_) :-
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atom(V), !.
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'$check_op_name'(_,_,A,G) :-
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'$do_error'(type_error(atom,A),G).
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'$op'(P, T, ML) :-
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strip_module(ML, M, [A|As]), !,
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'$opl'(P, T, M, [A|As]).
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'$op'(P, T, A) :-
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'$op2'(P,T,A).
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'$opl'(P, T, _, []).
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'$opl'(P, T, M, [A|As]) :-
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'$op2'(P, T, M:A),
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'$opl'(P, T, M, As).
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'$op2'(P,T,A) :-
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atom(A), !,
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'$opdec'(P,T,A,prolog).
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'$op2'(P,T,A) :-
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strip_module(A,M,N),
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'$opdec'(P,T,N,M).
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current_op(X,Y,V) :- var(V), !,
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'$current_module'(M),
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'$do_current_op'(X,Y,V,M).
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current_op(X,Y,M:Z) :- !,
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'$current_opm'(X,Y,Z,M).
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current_op(X,Y,Z) :-
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'$current_module'(M),
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'$do_current_op'(X,Y,Z,M).
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'$current_opm'(X,Y,Z,M) :-
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nonvar(Y),
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\+ '$associativity'(Y),
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'$do_error'(domain_error(operator_specifier,Y),current_op(X,Y,M:Z)).
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'$current_opm'(X,Y,Z,M) :-
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var(Z), !,
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'$do_current_op'(X,Y,Z,M).
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'$current_opm'(X,Y,M:Z,_) :- !,
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'$current_opm'(X,Y,Z,M).
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'$current_opm'(X,Y,Z,M) :-
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'$do_current_op'(X,Y,Z,M).
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'$do_current_op'(X,Y,Z,M) :-
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nonvar(Y),
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\+ '$associativity'(Y),
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'$do_error'(domain_error(operator_specifier,Y),current_op(X,Y,M:Z)).
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'$do_current_op'(X,Y,Z,M) :-
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atom(Z), !,
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'$current_atom_op'(Z, M1, Prefix, Infix, Posfix),
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( M1 = prolog -> true ; M1 = M ),
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(
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'$get_prefix'(Prefix, X, Y)
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;
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'$get_infix'(Infix, X, Y)
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;
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'$get_posfix'(Posfix, X, Y)
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).
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'$do_current_op'(X,Y,Z,M) :-
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'$current_op'(Z, M1, Prefix, Infix, Posfix),
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( M1 = prolog -> true ; M1 = M ),
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(
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'$get_prefix'(Prefix, X, Y)
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;
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'$get_infix'(Infix, X, Y)
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;
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'$get_posfix'(Posfix, X, Y)
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).
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'$get_prefix'(Prefix, X, Y) :-
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Prefix > 0,
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X is Prefix /\ 0xfff,
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(
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0x2000 /\ Prefix =:= 0x2000
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->
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Y = fx
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;
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Y = fy
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).
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'$get_infix'(Infix, X, Y) :-
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Infix > 0,
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X is Infix /\ 0xfff,
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(
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0x3000 /\ Infix =:= 0x3000
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->
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Y = xfx
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;
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0x1000 /\ Infix =:= 0x1000
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->
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Y = xfy
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;
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Y = yfx
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).
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'$get_posfix'(Posfix, X, Y) :-
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Posfix > 0,
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X is Posfix /\ 0xfff,
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(
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0x1000 /\ Posfix =:= 0x1000
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->
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Y = xf
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;
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Y = yf
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).
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%%% Operating System utilities
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cd :-
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cd('~').
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cd(F) :-
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absolute_file_name(F, Dir, [file_type(directory),file_errors(fail),access(execute),expand(true)]),
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working_directory(_, Dir).
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getcwd(Dir) :- working_directory(Dir, Dir).
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ls :-
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getcwd(X),
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'$load_system_ls'(X,L),
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'$do_print_files'(L).
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'$load_system_ls'(X,L) :-
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'$undefined'(directory_files(X, L), operating_system_support),
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load_files(library(system),[silent(true)]),
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fail.
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'$load_system_ls'(X,L) :-
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operating_system_support:directory_files(X, L).
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'$do_print_files'([]) :-
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nl.
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'$do_print_files'([F| Fs]) :-
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'$do_print_file'(F),
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'$do_print_files'(Fs).
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'$do_print_file'('.') :- !.
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'$do_print_file'('..') :- !.
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'$do_print_file'(F) :- atom_concat('.', _, F), !.
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'$do_print_file'(F) :-
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write(F), write(' ').
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pwd :-
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getcwd(X),
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write(X), nl.
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unix(V) :- var(V), !,
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'$do_error'(instantiation_error,unix(V)).
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unix(argv(L)) :- '$is_list_of_atoms'(L,L), !, '$argv'(L).
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unix(argv(V)) :-
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'$do_error'(type_error(atomic,V),unix(argv(V))).
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unix(cd) :- cd('~').
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unix(cd(A)) :- cd(A).
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unix(environ(X,Y)) :- '$do_environ'(X,Y).
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unix(getcwd(X)) :- getcwd(X).
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unix(shell(V)) :- var(V), !,
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'$do_error'(instantiation_error,unix(shell(V))).
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unix(shell(A)) :- atom(A), !, '$shell'(A).
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unix(shell(V)) :-
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'$do_error'(type_error(atomic,V),unix(shell(V))).
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unix(system(V)) :- var(V), !,
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'$do_error'(instantiation_error,unix(system(V))).
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unix(system(A)) :- atom(A), !, system(A).
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unix(system(V)) :-
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'$do_error'(type_error(atom,V),unix(system(V))).
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unix(shell) :- sh.
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unix(putenv(X,Y)) :- '$putenv'(X,Y).
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'$is_list_of_atoms'(V,_) :- var(V),!.
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'$is_list_of_atoms'([],_) :- !.
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'$is_list_of_atoms'([H|L],L0) :- !,
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'$check_if_head_may_be_atom'(H,L0),
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'$is_list_of_atoms'(L,L0).
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'$is_list_of_atoms'(H,L0) :-
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'$do_error'(type_error(list,H),unix(argv(L0))).
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'$check_if_head_may_be_atom'(H,_) :-
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var(H), !.
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'$check_if_head_may_be_atom'(H,_) :-
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atom(H), !.
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'$check_if_head_may_be_atom'(H,L0) :-
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'$do_error'(type_error(atom,H),unix(argv(L0))).
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'$do_environ'(X, Y) :-
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var(X), !,
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'$do_error'(instantiation_error,unix(environ(X,Y))).
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'$do_environ'(X, Y) :- atom(X), !,
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'$getenv'(X,Y).
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'$do_environ'(X, Y) :-
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'$do_error'(type_error(atom,X),unix(environ(X,Y))).
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putenv(Na,Val) :-
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'$putenv'(Na,Val).
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getenv(Na,Val) :-
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'$getenv'(Na,Val).
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setenv(Na,Val) :-
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'$putenv'(Na,Val).
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prolog :-
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'$live'.
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%%% current ....
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recordaifnot(K,T,R) :-
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recorded(K,T,R), % force non-det binding to R.
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'$still_variant'(R,T),
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!,
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fail.
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recordaifnot(K,T,R) :-
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recorda(K,T,R).
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recordzifnot(K,T,R) :-
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recorded(K,T,R),
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'$still_variant'(R,T),
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!,
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fail.
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recordzifnot(K,T,R) :-
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recordz(K,T,R).
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current_atom(A) :- % check
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atom(A), !.
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current_atom(A) :- % generate
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'$current_atom'(A).
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current_atom(A) :- % generate
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'$current_wide_atom'(A).
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atom_concat(X,Y,At) :-
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(
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nonvar(X), nonvar(Y)
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->
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atom_concat([X,Y],At)
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;
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atom(At) ->
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'$atom_contact_split'(At,X,Y)
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;
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var(At) ->
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'$do_error'(instantiation_error,atom_concat(X,Y,At))
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;
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'$do_error'(type_error(atom,At),atomic_concat(X,Y,At))
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).
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'$atom_contact_split'(At,X,Y) :-
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nonvar(X), !,
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atom_codes(At, Codes),
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atom_codes(X, Xs),
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lists:append(Xs,Ys,Codes),
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atom_codes(Y, Ys).
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'$atom_contact_split'(At,X,Y) :-
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nonvar(Y), !,
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atom_codes(At, Codes),
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atom_codes(Y, Ys),
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once(lists:append(Xs,Ys,Codes)),
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atom_codes(X, Xs).
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'$atom_contact_split'(At,X,Y) :-
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atom_codes(At, Codes),
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lists:append(Xs, Ys, Codes),
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atom_codes(X, Xs),
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atom_codes(Y, Ys).
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callable(A) :-
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( var(A) -> fail ; number(A) -> fail ; true ).
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atomic_list_concat(L,At) :-
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atomic_concat(L, At).
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atomic_list_concat(L, El, At) :-
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var(El), !,
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'$do_error'(instantiation_error,atom_list_concat(L,El,At)).
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atomic_list_concat(L, El, At) :-
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nonvar(L), !,
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'$add_els'(L,El,LEl),
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atomic_concat(LEl, At).
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atomic_list_concat(L, El, At) :-
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nonvar(At), !,
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atom_codes(At, S),
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atom_codes(El, [ElS]),
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'$split_elements'(S, ElS, SubS),
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'$atomify_list'(SubS, L).
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'$add_els'([A,B|L],El,[A,El|NL]) :- !,
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'$add_els'([B|L],El,NL).
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'$add_els'(L,_,L).
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'$split_elements'(E.S, E, SubS) :- !,
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'$split_elements'(S, E, SubS).
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'$split_elements'(E1.S, E, [E1|L].SubS) :- !,
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'$split_elements'(S, E, L, SubS).
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'$split_elements'([], _, []).
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'$split_elements'([], _, [], []).
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'$split_elements'(E.S, E, [], SubS) :- !,
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'$split_elements'(S, E, SubS).
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'$split_elements'(E1.S, E, E1.L, SubS) :-
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'$split_elements'(S, E, L, SubS).
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'$atomify_list'([], []).
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'$atomify_list'(S.SubS, A.L) :-
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atom_codes(A, S),
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'$atomify_list'(SubS, L).
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atomic_concat(X,Y,At) :-
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(
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nonvar(X), nonvar(Y)
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->
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atomic_concat([X,Y],At)
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;
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atom(At) ->
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atom_length(At,Len),
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'$atom_contact_split'(At,X,Y)
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;
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number(At) ->
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'$number_contact_split'(At,X,Y)
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;
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var(At) ->
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'$do_error'(instantiation_error,atomic_concat(X,Y,At))
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;
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'$do_error'(type_error(atomic,At),atomic_concat(X,Y,At))
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).
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'$number_contact_split'(At,X,Y) :-
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nonvar(X), !,
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number_codes(At, Codes),
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name(X, Xs),
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lists:append(Xs,Ys,Codes),
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name(Y, Ys).
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'$number_contact_split'(At,X,Y) :-
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nonvar(Y), !,
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number_codes(At, Codes),
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name(Y, Ys),
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once(lists:append(Xs,Ys,Codes)),
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name(X, Xs).
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'$number_contact_split'(At,X,Y) :-
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number_codes(At, Codes),
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lists:append(Xs, Ys, Codes),
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name(X, Xs),
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name(Y, Ys).
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sub_atom(At, Bef, Size, After, SubAt) :-
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% extract something from an atom
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atom(At), integer(Bef), integer(Size), !,
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'$sub_atom_extract'(At, Bef, Size, After, SubAt).
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sub_atom(At, Bef, Size, After, SubAt) :-
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% extract subatom from an atom
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atom(At), atom(SubAt), !,
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'$sub_atom_fetch'(At, Bef, Size, After, SubAt).
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sub_atom(At, Bef, Size, After, SubAt) :-
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atom(At), !,
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atom_codes(At, Atl),
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'$sub_atom2'(Bef, Atl, Size, After, SubAt, sub_atom(At, Bef, Size, After, SubAt)).
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sub_atom(At, Bef, Size, After, SubAt) :-
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var(At), !,
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'$do_error'(instantiation_error,sub_atom(At, Bef, Size,After, SubAt)).
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sub_atom(At, Bef, Size, After, SubAt) :-
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\+ atom(At), !,
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'$do_error'(type_error(atom,At),sub_atom(At, Bef, Size,After, SubAt)).
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'$sub_atom2'(Bef, Atl, Size, After, SubAt, ErrorTerm) :-
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var(Bef), !,
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'$sub_atombv'(Bef, Size, After, SubAt, Atl, ErrorTerm).
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'$sub_atom2'(Bef, Atl, Size, After, SubAt, ErrorTerm) :-
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'$sub_atom_get_subchars'(Bef, Atl, NewAtl),
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|
'$sub_atom3'(Size, After, SubAt, NewAtl, ErrorTerm).
|
|
|
|
% if SubAt is bound, the rest is deterministic.
|
|
'$sub_atom3'(Size, After, SubAt, Atl, ErrorTerm) :-
|
|
nonvar(SubAt), !,
|
|
'$sub_atom_needs_atom'(SubAt,ErrorTerm),
|
|
'$sub_atom_needs_int'(Size,ErrorTerm),
|
|
'$sub_atom_needs_int'(After,ErrorTerm),
|
|
atom_codes(SubAt,Atls),
|
|
length(Atls, 0, Size),
|
|
'$sub_atom_get_subchars_and_match'(Size, Atl, Atls, NAtl),
|
|
length(NAtl,0,After).
|
|
% SubAt is unbound, but Size is bound
|
|
'$sub_atom3'(Size, After, SubAt, Atl, ErrorTerm) :-
|
|
nonvar(Size), !,
|
|
'$sub_atom_needs_int'(Size,ErrorTerm),
|
|
'$sub_atom_needs_int'(After,ErrorTerm),
|
|
'$sub_atom_get_subchars_and_match'(Size, Atl, SubAts, NAtl),
|
|
length(NAtl,After),
|
|
atom_codes(SubAt,SubAts).
|
|
% SubAt and Size are unbound, but After is bound.
|
|
'$sub_atom3'(Size, After, SubAt, Atl, ErrorTerm) :-
|
|
nonvar(After), !,
|
|
'$sub_atom_needs_int'(After,ErrorTerm),
|
|
'$sub_atom_get_last_subchars'(Atl,SubAts,After,Total,Size),
|
|
Total >= After,
|
|
atom_codes(SubAt,SubAts).
|
|
% SubAt, Size, and After are unbound.
|
|
'$sub_atom3'(Size, After, SubAt, Atl, _) :-
|
|
length(Atl,Len),
|
|
'$sub_atom_split'(Atl,Len,SubAts,Size,_,After),
|
|
atom_codes(SubAt,SubAts).
|
|
|
|
% Bef is unbound, so we've got three hypothesis
|
|
% ok: in the best case we just try to find SubAt in the original atom.
|
|
'$sub_atombv'(Bef, Size, After, SubAt, Atl, ErrorTerm) :-
|
|
nonvar(SubAt), !,
|
|
'$sub_atom_needs_atom'(SubAt, ErrorTerm),
|
|
atom_codes(SubAt,SubAts),
|
|
'$sub_atom_search'(SubAts, Atl, 0, Bef, AfterS),
|
|
length(SubAts, Size),
|
|
length(AfterS, After).
|
|
% ok: in the second best case we just get rid of the tail
|
|
'$sub_atombv'(Bef, Size, After, SubAt, Atl, ErrorTerm) :-
|
|
nonvar(After), !,
|
|
'$sub_atom_needs_int'(After, ErrorTerm),
|
|
'$sub_atom_get_last_subchars'(Atl,SubAt0,After,Total,Size0),
|
|
Total >= After,
|
|
'$sub_atom_split'(SubAt0,Size0,_,Bef,SubAts,Size),
|
|
atom_codes(SubAt,SubAts).
|
|
% ok: just do everything
|
|
'$sub_atombv'(Bef, Size, After, SubAt, Atl, _) :-
|
|
length(Atl, Len),
|
|
'$sub_atom_split'(Atl,Len,_,Bef,Atls2,Len2),
|
|
'$sub_atom_split'(Atls2,Len2,SubAts,Size,_,After),
|
|
atom_codes(SubAt,SubAts).
|
|
|
|
'$sub_atom_search'([], AfterS, BefSize, BefSize, AfterS).
|
|
'$sub_atom_search'([C|SubAts], [C|Atl], BefSize, BefSize, AfterS) :-
|
|
'$sub_atom_search2'(SubAts, Atl, AfterS).
|
|
'$sub_atom_search'([C|SubAts], [_|Atl], BefSize, BefSizeF, AfterS) :-
|
|
NBefSize is BefSize+1,
|
|
'$sub_atom_search'([C|SubAts], Atl, NBefSize, BefSizeF, AfterS).
|
|
|
|
'$sub_atom_search2'([], AfterS, AfterS).
|
|
'$sub_atom_search2'([C|SubAts], [C|Atl], AfterS) :-
|
|
'$sub_atom_search2'(SubAts, Atl, AfterS).
|
|
|
|
'$sub_atom_get_subchars'(0, Atl, Atl) :- !.
|
|
'$sub_atom_get_subchars'(I0, [_|Atl], NAtl) :-
|
|
I is I0-1,
|
|
'$sub_atom_get_subchars'(I, Atl, NAtl).
|
|
|
|
'$sub_atom_get_subchars'(0, Atl, [], Atl) :- !.
|
|
'$sub_atom_get_subchars'(I0, [C|Atl], [C|L], NAtl) :-
|
|
I is I0-1,
|
|
'$sub_atom_get_subchars'(I, Atl, L, NAtl).
|
|
|
|
'$sub_atom_get_subchars_and_match'(0, Atl, [], Atl) :- !.
|
|
'$sub_atom_get_subchars_and_match'(I0, [C|Atl], [C|Match], NAtl) :-
|
|
I is I0-1,
|
|
'$sub_atom_get_subchars_and_match'(I, Atl, Match, NAtl).
|
|
|
|
'$sub_atom_check_length'([],0).
|
|
'$sub_atom_check_length'([_|L],N1) :-
|
|
N1 > 0,
|
|
N is N1-1,
|
|
'$sub_atom_check_length'(L,N).
|
|
|
|
'$sub_atom_get_last_subchars'([],[],_,0,0).
|
|
'$sub_atom_get_last_subchars'([C|Atl],SubAt,After,Total,Size) :-
|
|
'$sub_atom_get_last_subchars'(Atl,SubAt0,After,Total0,Size0),
|
|
Total is Total0+1,
|
|
( Total > After ->
|
|
Size is Size0+1, SubAt = [C|SubAt0]
|
|
;
|
|
Size = Size0, SubAt = SubAt0
|
|
).
|
|
|
|
'$sub_atom_split'(Atl,After,[],0,Atl,After).
|
|
'$sub_atom_split'([C|Atl],Len,[C|Atls],Size,NAtl,After) :-
|
|
Len1 is Len-1,
|
|
'$sub_atom_split'(Atl,Len1,Atls,Size0,NAtl,After),
|
|
Size is Size0+1.
|
|
|
|
'$sub_atom_needs_int'(V,_) :- var(V), !.
|
|
'$sub_atom_needs_int'(I,_) :- integer(I), I >= 0, !.
|
|
'$sub_atom_needs_int'(I,ErrorTerm) :- integer(I), !,
|
|
'$do_error'(domain_error(not_less_than_zero,I),ErrorTerm).
|
|
'$sub_atom_needs_int'(I,ErrorTerm) :-
|
|
'$do_error'(type_error(integer,I),ErrorTerm).
|
|
|
|
'$sub_atom_needs_atom'(V,_) :- var(V), !.
|
|
'$sub_atom_needs_atom'(A,_) :- atom(A), !.
|
|
'$sub_atom_needs_atom'(A,ErrorTerm) :-
|
|
'$do_error'(type_error(atom,A),ErrorTerm).
|
|
|
|
'$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]) :-
|
|
'$subtract_lists_of_variables'([V1|VL1],VL2,VL).
|
|
|
|
simple(V) :- var(V), !.
|
|
simple(A) :- atom(A), !.
|
|
simple(N) :- number(N).
|
|
|
|
callable(V) :- var(V), !, fail.
|
|
callable(V) :- atom(V), !.
|
|
callable(V) :- functor(V,_,Ar), Ar > 0.
|
|
|
|
nth_instance(Key,Index,Ref) :-
|
|
nonvar(Key), var(Index), var(Ref), !,
|
|
recorded(Key,_,Ref),
|
|
'$nth_instance'(_,Index,Ref).
|
|
nth_instance(Key,Index,Ref) :-
|
|
'$nth_instance'(Key,Index,Ref).
|
|
|
|
nth_instance(Key,Index,T,Ref) :-
|
|
nonvar(Key), var(Index), var(Ref), !,
|
|
recorded(Key,T,Ref),
|
|
'$nth_instance'(_,Index,Ref).
|
|
nth_instance(Key,Index,T,Ref) :-
|
|
'$nth_instance'(Key,Index,Ref),
|
|
instance(Ref,T).
|
|
|
|
nb_current(GlobalVariable, Val) :-
|
|
'$nb_current'(GlobalVariable),
|
|
'$nb_getval'(GlobalVariable, Val, _).
|
|
|
|
'$getval_exception'(GlobalVariable, Val, Caller) :-
|
|
user:exception(undefined_global_variable, GlobalVariable, Action),
|
|
!,
|
|
(
|
|
Action == fail
|
|
->
|
|
fail
|
|
;
|
|
Action == retry
|
|
->
|
|
b_getval(GlobalVariable, Val)
|
|
;
|
|
Action == error
|
|
->
|
|
'$do_error'(existence_error(variable, GlobalVariable),Caller)
|
|
;
|
|
'$do_error'(type_error(atom, Action),Caller)
|
|
).
|
|
|
|
|
|
subsumes_term(A,B) :-
|
|
\+ \+ terms:subsumes(A,B).
|
|
|
|
|