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import json
import re
from abc import abstractmethod
from typing import Dict, NamedTuple
from langchain.schema import BaseOutputParser
class AutoGPTAction(NamedTuple):
"""Action returned by AutoGPTOutputParser."""
name: str
args: Dict
class BaseAutoGPTOutputParser(BaseOutputParser):
"""Base Output parser for AutoGPT."""
@abstractmethod
def parse(self, text: str) -> AutoGPTAction:
"""Return AutoGPTAction"""
def preprocess_json_input(input_str: str) -> str:
"""Preprocesses a string to be parsed as json.
Replace single backslashes with double backslashes,
while leaving already escaped ones intact.
Args:
input_str: String to be preprocessed
Returns:
Preprocessed string
"""
corrected_str = re.sub(
r'(?<!\\)\\(?!["\\/bfnrt]|u[0-9a-fA-F]{4})', r"\\\\", input_str
)
return corrected_str
class AutoGPTOutputParser(BaseAutoGPTOutputParser):
"""Output parser for AutoGPT."""
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}"}
)
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