chore: merge blocksuite source code (#9213)

blocksuite/affine/shared/src/utils/collapsed/index.ts

@@ -0,0 +1 @@
+export * from './paragraph.js';

blocksuite/affine/shared/src/utils/collapsed/paragraph.ts

@@ -0,0 +1,57 @@
+import type { ParagraphBlockModel } from '@blocksuite/affine-model';
+import type { BlockModel } from '@blocksuite/store';
+
+import { matchFlavours } from '../model/checker.js';
+
+export function calculateCollapsedSiblings(
+  model: ParagraphBlockModel
+): BlockModel[] {
+  const parent = model.parent;
+  if (!parent) return [];
+  const children = parent.children;
+  const index = children.indexOf(model);
+  if (index === -1) return [];
+
+  const collapsedEdgeIndex = children.findIndex((child, i) => {
+    if (
+      i > index &&
+      matchFlavours(child, ['affine:paragraph']) &&
+      child.type.startsWith('h')
+    ) {
+      const modelLevel = parseInt(model.type.slice(1));
+      const childLevel = parseInt(child.type.slice(1));
+      return childLevel <= modelLevel;
+    }
+    return false;
+  });
+
+  let collapsedSiblings: BlockModel[];
+  if (collapsedEdgeIndex === -1) {
+    collapsedSiblings = children.slice(index + 1);
+  } else {
+    collapsedSiblings = children.slice(index + 1, collapsedEdgeIndex);
+  }
+
+  return collapsedSiblings;
+}
+
+export function getNearestHeadingBefore(
+  model: BlockModel
+): ParagraphBlockModel | null {
+  const parent = model.parent;
+  if (!parent) return null;
+  const index = parent.children.indexOf(model);
+  if (index === -1) return null;
+
+  for (let i = index - 1; i >= 0; i--) {
+    const sibling = parent.children[i];
+    if (
+      matchFlavours(sibling, ['affine:paragraph']) &&
+      sibling.type.startsWith('h')
+    ) {
+      return sibling;
+    }
+  }
+
+  return null;
+}