61 lines
1.1 KiB
Prolog
61 lines
1.1 KiB
Prolog
% File : varnumbers.yap
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% Author : Vitor Santos Costa
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% Updated: 2006
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% Purpose: opposite to numbervars
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:- module(varnumbers, [
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numbervars/1,
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max_var_number/3,
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varnumbers/2
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]).
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numbervars(Term) :-
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numbervars(Term, 0, _).
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max_var_number(V,Max,Max) :- var(V), !.
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max_var_number('$VAR'(I),Max0,Max) :- !,
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Max is max(I,Max0).
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max_var_number(S,Max0,Max) :-
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functor(S,_,Ar),
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max_var_numberl(0,Ar,S,Max0,Max).
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max_var_numberl(I0,Ar,T,Max0,Max) :-
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( I0 =:= Ar ->
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Max0 = Max
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;
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I is I0+1,
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arg(I,T,A),
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max_var_number(A,Max0,MaxI),
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max_var_numberl(I,Ar,T,MaxI,Max)
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).
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varnumbers(GT, VT) :-
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max_var_number(GT,0,Max),
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Max1 is Max+1,
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functor(Vars,vars,Max1),
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varnumbers(GT, Vars, VT).
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varnumbers(V,_,V) :- var(V), !.
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varnumbers('$VAR'(I),Vs,V) :- !,
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I1 is I+1,
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arg(I1,Vs,V).
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varnumbers(S,Vs,NS) :-
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functor(S,N,Ar),
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functor(NS,N,Ar),
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varnumbersl(0,Ar,Vs,S,NS).
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varnumbersl(I0,Ar,Vs,S,NS) :-
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(I0 =:= Ar ->
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true
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;
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I is I0+1,
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arg(I,S,A),
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arg(I,NS,NA),
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varnumbers(A,Vs,NA),
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varnumbersl(I,Ar,Vs,S,NS)
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).
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