refactor(editor): improve element adapters (#11473)

blocksuite/affine/gfx/mindmap/src/adapter/utils.ts

@@ -0,0 +1,65 @@
+import { getShapeText } from '@blocksuite/affine-gfx-shape';
+import {
+  buildMindMapTree,
+  type MindMapTreeNode,
+} from '@blocksuite/affine-model';
+
+/**
+ * traverse the mindMapTree and construct the content string
+ * like:
+ * - Root
+ *   - Child 1
+ *     - Child 1.1
+ *     - Child 1.2
+ *   - Child 2
+ *     - Child 2.1
+ *     - Child 2.2
+ *   - Child 3
+ *     - Child 3.1
+ *     - Child 3.2
+ * @param elementModel - the mindmap element model
+ * @param elements - the elements map
+ * @returns the mindmap tree text
+ */
+export function getMindMapTreeText(
+  elementModel: Record<string, unknown>,
+  elements: Record<string, Record<string, unknown>>,
+  options: {
+    prefix: string;
+    repeat: number;
+  } = {
+    prefix: ' ',
+    repeat: 2,
+  }
+): string {
+  let mindMapContent = '';
+  if (elementModel.type !== 'mindmap') {
+    return mindMapContent;
+  }
+
+  const mindMapTree = buildMindMapTree(elementModel);
+  if (!mindMapTree) {
+    return mindMapContent;
+  }
+
+  let layer = 0;
+  const traverseMindMapTree = (
+    node: MindMapTreeNode,
+    prefix: string,
+    repeat: number
+  ) => {
+    const shapeElement = elements[node.id as string];
+    const shapeText = getShapeText(shapeElement);
+    if (shapeElement) {
+      mindMapContent += `${prefix.repeat(layer * repeat)}- ${shapeText}\n`;
+    }
+    node.children.forEach(child => {
+      layer++;
+      traverseMindMapTree(child, prefix, repeat);
+      layer--;
+    });
+  };
+  traverseMindMapTree(mindMapTree, options.prefix, options.repeat);
+
+  return mindMapContent;
+}