xiamuceer
149 lines
5.4 KiB
Python
149 lines
5.4 KiB
Python
"""JSON 处理工具类"""
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import json
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import re
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from typing import Any, Dict, List, Union
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from app.logger import get_logger
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logger = get_logger(__name__)
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def clean_json_response(text: str) -> str:
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"""清洗 AI 返回的 JSON（改进版 - 流式安全）"""
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try:
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if not text:
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logger.warning("⚠️ clean_json_response: 输入为空")
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return text
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original_length = len(text)
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logger.debug(f"🔍 开始清洗JSON，原始长度: {original_length}")
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# 去除 markdown 代码块
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text = re.sub(r'^```json\s*\n?', '', text, flags=re.MULTILINE | re.IGNORECASE)
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text = re.sub(r'^```\s*\n?', '', text, flags=re.MULTILINE)
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text = re.sub(r'\n?```\s*$', '', text, flags=re.MULTILINE)
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text = text.strip()
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if len(text) != original_length:
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logger.debug(f" 移除markdown后长度: {len(text)}")
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# 尝试直接解析（快速路径）
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try:
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json.loads(text)
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logger.debug(f"✅ 直接解析成功，无需清洗")
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return text
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except:
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pass
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# 找到第一个 { 或 [
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start = -1
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for i, c in enumerate(text):
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if c in ('{', '['):
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start = i
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break
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if start == -1:
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logger.warning(f"⚠️ 未找到JSON起始符号 {{ 或 [")
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logger.debug(f" 文本预览: {text[:200]}")
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return text
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if start > 0:
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logger.debug(f" 跳过前{start}个字符")
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text = text[start:]
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# 改进的括号匹配算法（更严格的字符串处理）
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stack = []
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i = 0
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end = -1
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while i < len(text):
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c = text[i]
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# 处理字符串（关键：正确处理转义）
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if c == '"':
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# 计算前面有多少个连续的反斜杠
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num_backslashes = 0
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j = i - 1
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while j >= 0 and text[j] == '\\':
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num_backslashes += 1
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j -= 1
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# 偶数个反斜杠（包括0）表示引号未被转义
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if num_backslashes % 2 == 0:
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# 这是字符串边界，跳过整个字符串
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i += 1
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while i < len(text):
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if text[i] == '"':
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# 再次检查转义
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num_backslashes = 0
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j = i - 1
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while j >= 0 and text[j] == '\\':
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num_backslashes += 1
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j -= 1
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if num_backslashes % 2 == 0:
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# 字符串结束
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break
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i += 1
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i += 1
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continue
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# 处理括号（只有在字符串外部才有效）
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if c == '{' or c == '[':
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stack.append(c)
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elif c == '}':
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if len(stack) > 0 and stack[-1] == '{':
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stack.pop()
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if len(stack) == 0:
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end = i + 1
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logger.debug(f"✅ 找到JSON结束位置: {end}")
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break
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else:
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logger.warning(f"⚠️ 括号不匹配：遇到 }} 但栈顶是 {stack[-1] if stack else 'empty'}")
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elif c == ']':
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if len(stack) > 0 and stack[-1] == '[':
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stack.pop()
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if len(stack) == 0:
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end = i + 1
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logger.debug(f"✅ 找到JSON结束位置: {end}")
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break
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else:
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logger.warning(f"⚠️ 括号不匹配：遇到 ] 但栈顶是 {stack[-1] if stack else 'empty'}")
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i += 1
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# 提取结果
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if end > 0:
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result = text[:end]
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logger.debug(f"✅ JSON清洗完成，结果长度: {len(result)}")
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else:
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result = text
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logger.warning(f"⚠️ 未找到JSON结束位置，返回全部内容（长度: {len(result)}）")
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logger.debug(f" 栈状态: {stack}")
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# 验证清洗后的结果
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try:
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json.loads(result)
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logger.debug(f"✅ 清洗后JSON验证成功")
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except json.JSONDecodeError as e:
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logger.error(f"❌ 清洗后JSON仍然无效: {e}")
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logger.debug(f" 结果预览: {result[:500]}")
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logger.debug(f" 结果结尾: ...{result[-200:]}")
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return result
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except Exception as e:
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logger.error(f"❌ clean_json_response 出错: {e}")
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logger.error(f" 文本长度: {len(text) if text else 0}")
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logger.error(f" 文本预览: {text[:200] if text else 'None'}")
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raise
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def parse_json(text: str) -> Union[Dict, List]:
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"""解析 JSON"""
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try:
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cleaned = clean_json_response(text)
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return json.loads(cleaned)
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except Exception as e:
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logger.error(f"❌ parse_json 出错: {e}")
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logger.error(f" 原始文本长度: {len(text) if text else 0}")
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logger.error(f" 清洗后文本长度: {len(cleaned) if cleaned else 0}")
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raise |