diogo/yap-6.3
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fix ground cyclic terms (thanks to Paulo).

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This commit is contained in:
Vítor Santos Costa
2012-10-02 15:13:52 +01:00
parent e6fb32d9ca
commit 8eede3eb73
1 changed files with 17 additions and 1 deletions
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18
pl/setof.yap
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@@ -150,7 +150,7 @@ bagof(Template, Generator, Bag) :-
; L = L0
).
'$excess_vars'(A, A, _, L, L) :-
atomic(A), !.
ground(A), !.
'$excess_vars'(X^P, NP, Y, L0, L) :- !,
'$variables_in_term'(X+Y, [], NY),
'$excess_vars'(P, NP, NY, L0, L).
@@ -166,6 +166,22 @@ bagof(Template, Generator, Bag) :-
'$excess_vars'(S, _, Y, L0, L).
'$excess_vars'(\+G, \+G, _, L0, LF) :- !,
L0 = LF.
'$excess_vars'((G1,G2), (NG1, NG2), Y, L0, LF) :- !,
'$excess_vars'(G1, NG1, Y, L0, L1),
'$excess_vars'(G2, NG2, Y, L1, LF).
'$excess_vars'((G1;G2), (NG1; NG2), Y, L0, LF) :- !,
'$excess_vars'(G1, NG1, Y, L0, L1),
'$excess_vars'(G2, NG2, Y, L1, LF).
'$excess_vars'((G1->G2), (NG1-> NG2), Y, L0, LF) :- !,
'$excess_vars'(G1, NG1, Y, L0, L1),
'$excess_vars'(G2, NG2, Y, L1, LF).
'$excess_vars'((G1*->G2), (NG1 *-> NG2), Y, L0, LF) :- !,
'$excess_vars'(G1, NG1, Y, L0, L1),
'$excess_vars'(G2, NG2, Y, L1, LF).
'$excess_vars'(if(G1,G2,G3), if(NG1, NG2, NG3), Y, L0, LF) :- !,
'$excess_vars'(G1, NG1, Y, L0, L1),
'$excess_vars'(G2, NG2, Y, L1, L2),
'$excess_vars'(G3, NG3, Y, L2, LF).
'$excess_vars'(_:G1, M:NG, Y, L0, LF) :- nonvar(G1), G1 = M:G, !,
'$excess_vars'(G, NG, Y, L0, LF).
'$excess_vars'(M:G, M:NG, Y, L0, LF) :- !,