♻️ Refactor code

frontend/src/views/editor/extensions/statsExtension.ts

@@ -0,0 +1,42 @@
+import {Extension} from '@codemirror/state';
+import {EditorView} from '@codemirror/view';
+import {DocumentStats} from '@/types/editor';
+
+// 更新编辑器文档统计信息
+export const updateStats = (
+  view: EditorView, 
+  updateDocumentStats: (stats: DocumentStats) => void
+) => {
+  if (!view) return;
+  
+  const state = view.state;
+  const doc = state.doc;
+  const text = doc.toString();
+  
+  // 计算选中的字符数
+  let selectedChars = 0;
+  const selections = state.selection;
+  if (selections) {
+    for (let i = 0; i < selections.ranges.length; i++) {
+      const range = selections.ranges[i];
+      selectedChars += range.to - range.from;
+    }
+  }
+  
+  updateDocumentStats({
+    lines: doc.lines,
+    characters: text.length,
+    selectedCharacters: selectedChars
+  });
+};
+
+// 创建统计信息更新监听器扩展
+export const createStatsUpdateExtension = (
+  updateDocumentStats: (stats: DocumentStats) => void
+): Extension => {
+  return EditorView.updateListener.of(update => {
+    if (update.docChanged || update.selectionSet) {
+      updateStats(update.view, updateDocumentStats);
+    }
+  });
+};