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50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
"""Strategies used with MultiStrategyParser parsers."""
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import json
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from langchain.output_parsers.json import (
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REGEXES,
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fix_json_with_embedded_code_block,
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parse_json_markdown,
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)
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from langchain.output_parsers.multi_strategy.base import ParseStrategy
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def is_bare_json(text: str) -> dict:
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"""Tries to load as bare json"""
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return json.loads(text.strip())
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def json_markdown(text: str) -> dict:
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"""Extract a json object from markdown markup"""
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return parse_json_markdown(text)
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def json_nested_md_code_block(text: str) -> dict:
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"""Extract the outermost code block. Can accomodate nested code blocks."""
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return parse_json_markdown(text, regex=REGEXES["nested_json_md_code_block"])
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def fallback(text: str) -> dict:
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"""Example fallback strategy."""
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return {"action": "Final Answer", "action_input": text}
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# The order of the strategies is important
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# They are tried in order and the first one that matches is used
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json_react_strategies = (
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ParseStrategy(is_bare_json, lambda text: text.startswith("{"), name="bare_json"),
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ParseStrategy(json_markdown, lambda text: text.find("```") != -1),
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ParseStrategy(
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json_nested_md_code_block,
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lambda text: text.find("```") != -1,
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name="nested_code_block",
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),
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ParseStrategy(
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fix_json_with_embedded_code_block,
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lambda text: text.find("```") != -1,
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name="fix_embedded_code_block",
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),
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# this is where a fallback would go
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# ParseStrategy(fallback, lambda _: True),
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)
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