Method _parse_and_update_cell

modules/xml_merger.py:375–414

解析XML片段并更新ID Args: xml_content: mxCell的XML字符串 new_id: 新分配的ID Returns: 更新后的ET.Element，解析失败返回None

(self, xml_content: str, new_id: int)

        return mxfile
    
    def _parse_and_update_cell(self, xml_content: str, new_id: int) -> Optional[ET.Element]:
        """
        解析XML片段并更新ID
        
        Args:
            xml_content: mxCell的XML字符串
            new_id: 新分配的ID
            
        Returns:
            更新后的ET.Element，解析失败返回None
        """
        try:
            # 清理XML字符串
            xml_content = xml_content.strip()
            
            # 如果不是以<mxCell开头，尝试提取mxCell部分
            if not xml_content.startswith('<mxCell'):
                match = re.search(r'<mxCell[^>]*>.*?</mxCell>|<mxCell[^>]*/>', 
                                  xml_content, re.DOTALL)
                if match:
                    xml_content = match.group()
                else:
                    self._log(f"警告: 无法提取mxCell: {xml_content[:100]}...")
                    return None
            
            # 解析XML
            cell = ET.fromstring(xml_content)
            
            # 更新ID
            cell.set("id", str(new_id))
            
            # 确保parent正确（除了特殊cell外，都应该是"1"）
            if cell.get("parent") not in ["0"]:
                cell.set("parent", "1")
            
            return cell
            
        except ET.ParseError as e:
            self._log(f"XML解析失败: {e}, 内容: {xml_content[:100]}...")
            return None
    
    def _create_base_xml(self, canvas_width: int, canvas_height: int) -> ET.Element:
        """创建DrawIO基础XML结构"""