chore: merge blocksuite source code (#9213)

blocksuite/framework/inline/src/utils/text.ts

@@ -0,0 +1,25 @@
+import { ZERO_WIDTH_SPACE } from '../consts.js';
+
+export function calculateTextLength(text: Text): number {
+  if (text.wholeText === ZERO_WIDTH_SPACE) {
+    return 0;
+  } else {
+    return text.wholeText.length;
+  }
+}
+
+export function getTextNodesFromElement(element: Element): Text[] {
+  const textSpanElements = Array.from(
+    element.querySelectorAll('[data-v-text="true"]')
+  );
+  const textNodes = textSpanElements.flatMap(textSpanElement => {
+    const textNode = Array.from(textSpanElement.childNodes).find(
+      (node): node is Text => node instanceof Text
+    );
+    if (!textNode) return [];
+
+    return textNode;
+  });
+
+  return textNodes;
+}