from typing import Optional as Optional

from langchain_core.output_parsers.transform import BaseTransformOutputParser


class StrOutputParser(BaseTransformOutputParser[str]):
    """OutputParser that parses LLMResult into the top likely string."""

    @classmethod
    def is_lc_serializable(cls) -> bool:
        """Return whether this class is serializable."""
        return True

    @classmethod
    def get_lc_namespace(cls) -> list[str]:
        """Get the namespace of the langchain object."""
        return ["langchain", "schema", "output_parser"]

    @property
    def _type(self) -> str:
        """Return the output parser type for serialization."""
        return "default"

    def parse(self, text: str) -> str:
        """Returns the input text with no changes."""
        return text


StrOutputParser.model_rebuild()