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optimize splay tree #907

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optimize splay tree #907

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539490b
optimize splay tree
m4ushold Oct 2, 2024
0329ccd
Refactor code based on CodeRabbit AI recommendations
m4ushold Oct 2, 2024
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20 changes: 18 additions & 2 deletions packages/sdk/src/util/splay_tree.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -170,9 +170,13 @@ export abstract class SplayNode<V> {
*/
export class SplayTree<V> {
private root?: SplayNode<V>;
private static readonly SPLAY_THRESHOLD = 500;
private linearCount: number;
private firstNode?: SplayNode<V>;

constructor(root?: SplayNode<V>) {
this.root = root;
this.linearCount = 0;
}

/**
Expand Down Expand Up @@ -211,7 +215,7 @@ export class SplayTree<V> {
`out of index range: pos: ${pos} > node.length: ${node.getLength()}`,
);
}
this.splayNode(node)
this.splayNode(node);
return [node, pos];
}

Expand All @@ -226,7 +230,7 @@ export class SplayTree<V> {
return -1;
}

this.splayNode(node)
this.splayNode(node);
return this.root!.getLeftWeight();
}

Expand Down Expand Up @@ -257,6 +261,18 @@ export class SplayTree<V> {
return newNode;
}

if (target == this.root) {
this.linearCount++;
if (this.linearCount == 1) {
this.firstNode = newNode;
} else if (this.linearCount > SplayTree.SPLAY_THRESHOLD) {
this.splayNode(this.firstNode);
this.linearCount = 0;
Comment on lines +269 to +270
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⚠️ Potential issue

Ensure firstNode is defined before splaying

Although firstNode should be defined when linearCount > 500, adding a safety check can prevent unexpected errors if the state changes in the future.

Apply this diff to add a null check:

   } else if (this.linearCount > 500) {
+    if (this.firstNode) {
       this.splayNode(this.firstNode);
+    }
     this.linearCount = 0;

Committable suggestion was skipped due to low confidence.

}
} else {
this.linearCount = 0;
}

Comment on lines +264 to +275
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⚠️ Potential issue

Implement the new balancing strategy with some improvements.

The new logic effectively implements the proposed balancing strategy for linear insertions, aligning well with the PR objectives. However, there are a few points to address:

  1. Use strict equality (===) instead of loose equality (==) for comparisons.
  2. Add a null check before splaying firstNode.
  3. Consider resetting firstNode after splaying.

Apply this diff to address the points mentioned:

-    if (target == this.root) {
+    if (target === this.root) {
       this.linearCount++;
-      if (this.linearCount == 1) {
+      if (this.linearCount === 1) {
         this.firstNode = newNode;
       } else if (this.linearCount > SplayTree.SPLAY_THRESHOLD) {
-        this.splayNode(this.firstNode);
+        if (this.firstNode) {
+          this.splayNode(this.firstNode);
+          this.firstNode = undefined;
+        }
         this.linearCount = 0;
       }
     } else {
       this.linearCount = 0;
+      this.firstNode = undefined;
     }

These changes improve type safety, prevent potential null pointer exceptions, and ensure proper reset of the firstNode reference.

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
if (target == this.root) {
this.linearCount++;
if (this.linearCount == 1) {
this.firstNode = newNode;
} else if (this.linearCount > SplayTree.SPLAY_THRESHOLD) {
this.splayNode(this.firstNode);
this.linearCount = 0;
}
} else {
this.linearCount = 0;
}
if (target === this.root) {
this.linearCount++;
if (this.linearCount === 1) {
this.firstNode = newNode;
} else if (this.linearCount > SplayTree.SPLAY_THRESHOLD) {
if (this.firstNode) {
this.splayNode(this.firstNode);
this.firstNode = undefined;
}
this.linearCount = 0;
}
} else {
this.linearCount = 0;
this.firstNode = undefined;
}

this.splayNode(target);
this.root = newNode;
newNode.setRight(target.getRight());
Expand Down
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