在ace中有没有函数可以返回匹配的括号位置？

function findMatchingBracket(editor) {
  var cursor = editor.getCursorPosition();
  var iterator = new TokenIterator(editor.getSession(), cursor.row, cursor.column);
  var token = iterator.getCurrentToken();

  if (token && (token.type === 'paren.lparen' || token.type === 'paren.rparen')) {
    var bracketCount = 1;
    var startToken = token;
    var endToken = null;

    while ((token = iterator.stepBackward())) {
      if (token.type === 'paren.lparen') {
        bracketCount--;
        if (bracketCount === 0) {
          endToken = token;
          break;
        }
      } else if (token.type === 'paren.rparen') {
        bracketCount++;
      }
    }

    if (endToken) {
      var startPos = editor.session.doc.indexToPosition(startToken.start);
      var endPos = editor.session.doc.indexToPosition(endToken.start);
      return {
        start: startPos,
        end: endPos
      };
    }
  }

  return null;
}