diogo/yap-6.3
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make sublist from hprolog and sublist from yap be the same beast.

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Vitor Santos Costa
2010-03-15 14:19:05 +00:00
parent 9cce7df45b
commit cfc0a23953
2 changed files with 35 additions and 21 deletions
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19
library/lists.yap
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@@ -267,10 +267,21 @@ select(Element, [Head|Tail], [Head|Rest]) :-
% sublist(Sublist, List)
% is true when both append(_,Sublist,S) and append(S,_,List) hold.
sublist(Sublist, List) :-
prefix(Sublist, List).
sublist(Sublist, [_|List]) :-
sublist(Sublist, List).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% sublist(?Sub, +List) is nondet.
%
% True if all elements of Sub appear in List in the same order.
sublist(L, L).
sublist(Sub, [H|T]) :-
'$sublist1'(T, H, Sub).
'$sublist1'(Sub, _, Sub).
'$sublist1'([H|T], _, Sub) :-
'$sublist1'(T, H, Sub).
'$sublist1'([H|T], X, [X|Sub]) :-
'$sublist1'(T, H, Sub).
% substitute(X, XList, Y, YList)
% is true when XList and YList only differ in that the elements X in XList