✨ Improve code block function

frontend/src/views/editor/extensions/codeblock/transposeChars.ts

@@ -0,0 +1,53 @@
+/**
+ * 字符转置功能
+ * 交换光标前后的字符
+ */
+
+import { EditorSelection, findClusterBreak } from "@codemirror/state";
+import { getNoteBlockFromPos } from "./state";
+
+/**
+ * 交换光标前后的字符
+ */
+export const transposeChars = ({ state, dispatch }: { state: any; dispatch: any }): boolean => {
+  if (state.readOnly) {
+    return false;
+  }
+  
+  let changes = state.changeByRange((range: any) => {
+    // 防止在代码块的开始或结束位置进行字符转置，因为这会破坏块语法
+    const block = getNoteBlockFromPos(state, range.from);
+    if (block && (range.from === block.content.from || range.from === block.content.to)) {
+      return { range };
+    }
+
+    if (!range.empty || range.from == 0 || range.from == state.doc.length) {
+      return { range };
+    }
+    
+    let pos = range.from;
+    let line = state.doc.lineAt(pos);
+    let from = pos == line.from ? pos - 1 : findClusterBreak(line.text, pos - line.from, false) + line.from;
+    let to = pos == line.to ? pos + 1 : findClusterBreak(line.text, pos - line.from, true) + line.from;
+    
+    return { 
+      changes: { 
+        from, 
+        to, 
+        insert: state.doc.slice(pos, to).append(state.doc.slice(from, pos)) 
+      },
+      range: EditorSelection.cursor(to) 
+    };
+  });
+  
+  if (changes.changes.empty) {
+    return false;
+  }
+  
+  dispatch(state.update(changes, { 
+    scrollIntoView: true, 
+    userEvent: "move.character" 
+  }));
+  
+  return true;
+};