Harrison/official pre release (#8106)

libs/experimental/langchain_experimental/autonomous_agents/autogpt/output_parser.py

@@ -0,0 +1,60 @@
+import json
+import re
+from abc import abstractmethod
+from typing import Dict, NamedTuple
+
+from langchain.schema import BaseOutputParser
+
+
+class AutoGPTAction(NamedTuple):
+    name: str
+    args: Dict
+
+
+class BaseAutoGPTOutputParser(BaseOutputParser):
+    @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):
+    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}"}
+            )