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fix(avl): do not propagate all the way if not necessary

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Signed-off-by: Matej Focko <mfocko@redhat.com>
This commit is contained in:
Matej Focko 2022-05-16 19:27:43 +02:00
parent f17abfd50e
commit 41c9c05ab2
Signed by: mfocko
GPG key ID: 7C47D46246790496
1 changed files with 13 additions and 8 deletions
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21
avl.js
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@ -153,12 +153,10 @@ class AVLTree extends RankedTree {
this.record("Updating rank of nodes affected by rotations", n); this.record("Updating rank of nodes affected by rotations", n);
}); });
return factor == 0; return factor != 0;
} }
deleteFixup(y, parent) { deleteFixup(x, parent) {
let x = y ? y : parent;
let factor = balanceFactor(x); let factor = balanceFactor(x);
switch (factor) { switch (factor) {
case 0: case 0:
@ -168,10 +166,10 @@ class AVLTree extends RankedTree {
x x
); );
return false; return true;
case -1: case -1:
case 1: case 1:
return true; return false;
} }
let rotatingAroundRoot = x.parent == null; let rotatingAroundRoot = x.parent == null;
@ -201,8 +199,15 @@ class AVLTree extends RankedTree {
} }
deleteRebalance(node, parent) { deleteRebalance(node, parent) {
while (node || parent) { if (!node && !parent) {
this.deleteFixup(node, parent); return;
}
if (!node) {
[node, parent] = [parent, parent.parent];
}
while (node && this.deleteFixup(node, parent)) {
[node, parent] = [parent, parent ? parent.parent : null]; [node, parent] = [parent, parent ? parent.parent : null];
} }
} }