chore: merge blocksuite source code (#9213)

blocksuite/affine/model/src/elements/mindmap/utils.ts

@@ -0,0 +1,46 @@
+import type { MindmapNode } from './mindmap.js';
+
+export function findInfiniteLoop(
+  root: MindmapNode,
+  nodeMap: Map<string, MindmapNode>
+) {
+  const visited = new Set<string>();
+  const loop: {
+    detached: boolean;
+    chain: MindmapNode[];
+  }[] = [];
+
+  const traverse = (
+    node: MindmapNode,
+    traverseChain: MindmapNode[] = [],
+    detached = false
+  ) => {
+    if (visited.has(node.id)) {
+      loop.push({
+        detached,
+        chain: traverseChain,
+      });
+      return;
+    }
+
+    visited.add(node.id);
+
+    traverseChain.push(node);
+
+    node.children.forEach(child =>
+      traverse(child, traverseChain.slice(), detached)
+    );
+  };
+
+  traverse(root);
+
+  nodeMap.forEach(node => {
+    if (visited.has(node.id)) {
+      return;
+    }
+
+    traverse(node, [], true);
+  });
+
+  return loop;
+}