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add rb_fold/4.

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Costa Vitor 2012-08-24 15:19:15 -05:00
parent 495d852879
commit cb53d087b2
2 changed files with 37 additions and 0 deletions
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11
docs/yap.tex
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@ -10910,6 +10910,17 @@ holds, then the value associated with @var{Key} in @var{TN} is
@var{ValF}. Fails if or if @code{call(G,Val0,ValF)} is not satisfiable
for all @var{Var0}. Assumes keys are not repeated.
@item rb_fold(+@var{T},+@var{G},+@var{Acc0}, -@var{AccF})
@findex rb_fold/4
@snindex rb_fold/4
@cnindex rb_fold/4
For all nodes @var{Key} in the tree @var{T}, if the value
associated with key @var{Key} is @var{V} in tree @var{T}, if
@code{call(G,V,Acc1,Acc2)} holds, then if @var{VL} is value of the
previous node in inorder, @code{call(G,VL,_,Acc0)} must hold, and if
@var{VR} is the value of the next node in inorder,
@code{call(G,VR,Acc1,_)} must hold.
@item rb_clone(+@var{T},+@var{NT},+@var{Nodes})
@findex rb_clone/3
@snindex rb_clone/3

26
library/rbtrees.yap
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@ -30,6 +30,7 @@
rb_map/2,
rb_map/3,
rb_partial_map/4,
rb_accumulate/4,
rb_clone/3,
rb_clone/4,
rb_min/3,
@ -820,6 +821,31 @@ map(black(L,_,V,R),Goal) :-
map(L,Goal),
map(R,Goal).
:- meta_predicate rb_accumulate(?,3,?,?). % this is required.
:- meta_predicate map_acc(?,3,?,?). % this is required.
%% rb_fold(+T, :G, +Acc0, -AccF) is semidet.
%
% For all nodes Key in the tree T, if the value associated with
% key Key is V in tree T, if call(G,V,Acc1,Acc2) holds, then
% if VL is value of the previous node in inorder,
% call(G,VL,_,Acc0) must hold, and
% if VR is the value of the next node in inorder,
% call(G,VR,Acc1,_) must hold.
rb_fold(t(_,Tree), Goal, In, Out) :-
map_acc(Tree, Goal, In, Out).
map_acc(black('',_,_,''), _, Acc, Acc) :- !.
map_acc(red(L,_,V,R), Goal, Left, Right) :-
map_acc(L,Goal, Left, Left1),
once(call(Goal,V, Left1, Right1)),
map_acc(R,Goal, Right1, Right).
map_acc(black(L,_,V,R), Goal, Left, Right) :-
map_acc(L,Goal, Left, Left1),
once(call(Goal,V, Left1, Right1)),
map_acc(R,Goal, Right1, Right).
%% rb_clone(+T, -NT, -Pairs)
%
% "Clone" the red-back tree into a new tree with the same keys as