54 lines
997 B
Plaintext
54 lines
997 B
Plaintext
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%% @file yapi.yap
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%% @brief support yap shell
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%%
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:- module(yapi, [bindvars/2]).
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:- use_module( library(maplist) ).
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:- use_module( library(rbtrees) ).
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bindvars( [], [] ) :- !.
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bindvars( L, NL ) :-
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rb_new(T),
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% trace,
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foldl2( bind, L, NL, T, _ , 0, _),
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term_variables(NL, Vs),
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foldl( bind_new, Vs, 0, _).
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bind(t(_,t(X,Y)), Z, T0, T, N1, N2) :-
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!,
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bind(X=Y, Z, T0, T, N1, N2).
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bind(tuple(_,tuple(X,Y)), Z, T0, T, N1, N2) :-
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!,
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bind(X=Y, Z, T0, T, N1, N2).
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bind(X=Y, X=X, T0, T, N, N) :-
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var(Y),
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!,
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rb_update(T0, Y, X, T).
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bind(X = G, X = G, T, T, N0, N0) :-
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ground(G),
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!.
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bind(X = C, X = NC, T, NT, N0, NF) :-
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C =.. [N|L],
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foldl2(newb, L, NL, T, NT, N0, NF),
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NC =.. [N|NL].
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newb(Y, X, T, T, N, N) :-
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var(Y),
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rb_lookup(Y, X, T),
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!.
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newb(Y, X, T, TN, N, NF) :-
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var(Y),
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!,
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rb_insert(Y, T, X, TN),
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NF is N+1,
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atomic_concat('_',N,X).
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newb(Y, Y, T, T, N, N) :-
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ground(Y),
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!.
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newb(Y, X, T, NT, N0, NF) :-
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Y =.. [N|L],
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foldl2(newb, L, NL, T, NT, N0, NF),
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X =.. [N|NL].
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