% File : varnumbers.yap
% Author : Vitor Santos Costa
% Updated: 2006
% Purpose: opposite to numbervars
:- module(varnumbers, [
numbervars/1,
max_var_number/3,
varnumbers/2
]).
numbervars(Term) :-
numbervars(Term, 0, _).
max_var_number(V,Max,Max) :- var(V), !.
max_var_number('$VAR'(I),Max0,Max) :- !,
Max is max(I,Max0).
max_var_number(S,Max0,Max) :-
functor(S,_,Ar),
max_var_numberl(0,Ar,S,Max0,Max).
max_var_numberl(I0,Ar,T,Max0,Max) :-
( I0 =:= Ar ->
Max0 = Max
;
I is I0+1,
arg(I,T,A),
max_var_number(A,Max0,MaxI),
max_var_numberl(I,Ar,T,MaxI,Max)
).
varnumbers(GT, VT) :-
unnumbervars(GT, VT).
