35 lines
675 B
Prolog
35 lines
675 B
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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unnumbervars(GT, VT).
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