Source code for langchain_experimental.plan_and_execute.schema

from abc import abstractmethod
from typing import List, Tuple

from langchain_core.output_parsers import BaseOutputParser
from pydantic import BaseModel, Field



[docs]
class Step(BaseModel):
    """Step."""

    value: str
    """The value."""




[docs]
class Plan(BaseModel):
    """Plan."""

    steps: List[Step]
    """The steps."""




[docs]
class StepResponse(BaseModel):
    """Step response."""

    response: str
    """The response."""




[docs]
class BaseStepContainer(BaseModel):
    """Base step container."""


[docs]
    @abstractmethod
    def add_step(self, step: Step, step_response: StepResponse) -> None:
        """Add step and step response to the container."""



[docs]
    @abstractmethod
    def get_final_response(self) -> str:
        """Return the final response based on steps taken."""





[docs]
class ListStepContainer(BaseStepContainer):
    """Container for List of steps."""

    steps: List[Tuple[Step, StepResponse]] = Field(default_factory=list)
    """The steps."""


[docs]
    def add_step(self, step: Step, step_response: StepResponse) -> None:
        self.steps.append((step, step_response))



[docs]
    def get_steps(self) -> List[Tuple[Step, StepResponse]]:
        return self.steps



[docs]
    def get_final_response(self) -> str:
        return self.steps[-1][1].response





[docs]
class PlanOutputParser(BaseOutputParser):
    """Plan output parser."""


[docs]
    @abstractmethod
    def parse(self, text: str) -> Plan:
        """Parse into a plan."""