Source code for langchain_experimental.autonomous_agents.autogpt.output_parser

import json
import re
from abc import abstractmethod
from typing import Dict, NamedTuple

from langchain_core.output_parsers import BaseOutputParser


class AutoGPTAction(NamedTuple):
    """AutoGPTOutputParser返回的操作。"""

    name: str
    args: Dict


class BaseAutoGPTOutputParser(BaseOutputParser):
    """AutoGPT的基本输出解析器。"""

    @abstractmethod
    def parse(self, text: str) -> AutoGPTAction:
        """返回AutoGPTAction"""


def preprocess_json_input(input_str: str) -> str:
    """预处理字符串以便解析为json。

    将单个反斜杠替换为双反斜杠，同时保留已经转义的反斜杠不变。

    参数:
        input_str: 需要预处理的字符串

    返回:
        预处理后的字符串
    """
    corrected_str = re.sub(
        r'(?<!\\)\\(?!["\\/bfnrt]|u[0-9a-fA-F]{4})', r"\\\\", input_str
    )
    return corrected_str


class AutoGPTOutputParser(BaseAutoGPTOutputParser):
    """AutoGPT的输出解析器。"""

    def parse(self, text: str) -> AutoGPTAction:
        try:
            parsed = json.loads(text, strict=False)
        except json.JSONDecodeError:
            preprocessed_text = preprocess_json_input(text)
            try:
                parsed = json.loads(preprocessed_text, strict=False)
            except Exception:
                return AutoGPTAction(
                    name="ERROR",
                    args={"error": f"Could not parse invalid json: {text}"},
                )
        try:
            return AutoGPTAction(
                name=parsed["command"]["name"],
                args=parsed["command"]["args"],
            )
        except (KeyError, TypeError):
            # If the command is null or incomplete, return an erroneous tool
            return AutoGPTAction(
                name="ERROR", args={"error": f"Incomplete command args: {parsed}"}
            )