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52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
"""BasePrompt schema definition."""
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from abc import ABC, abstractmethod
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from typing import Any, List
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from langchain.formatting import formatter
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DEFAULT_FORMATTER_MAPPING = {
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"f-string": formatter.format,
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}
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def check_valid_template(
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template: str, template_format: str, input_variables: List[str]
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) -> None:
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"""Check that template string is valid."""
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if template_format not in DEFAULT_FORMATTER_MAPPING:
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valid_formats = list(DEFAULT_FORMATTER_MAPPING)
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raise ValueError(
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f"Invalid template format. Got `{template_format}`;"
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f" should be one of {valid_formats}"
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)
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dummy_inputs = {input_variable: "foo" for input_variable in input_variables}
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try:
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formatter_func = DEFAULT_FORMATTER_MAPPING[template_format]
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formatter_func(template, **dummy_inputs)
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except KeyError:
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raise ValueError("Invalid prompt schema.")
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class BasePromptTemplate(ABC):
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"""Base prompt should expose the format method, returning a prompt."""
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input_variables: List[str]
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"""A list of the names of the variables the prompt template expects."""
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@abstractmethod
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def format(self, **kwargs: Any) -> str:
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"""Format the prompt with the inputs.
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Args:
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kwargs: Any arguments to be passed to the prompt template.
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Returns:
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A formatted string.
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Example:
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.. code-block:: python
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prompt.format(variable1="foo")
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"""
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