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"""Support for alias configurations.""" from __future__ import annotations import dataclasses from typing import Any, Callable, Literal from pydantic_core import PydanticUndefined from ._internal import _internal_dataclass __all__ = ('AliasGenerator', 'AliasPath', 'AliasChoices') @dataclasses.dataclass(**_internal_dataclass.slots_true) class AliasPath: """Usage docs: https://docs.pydantic.dev/2.8/concepts/alias#aliaspath-and-aliaschoices A data class used by `validation_alias` as a convenience to create aliases. Attributes: path: A list of string or integer aliases. """ path: list[int | str] def __init__(self, first_arg: str, *args: str | int) -> None: self.path = [first_arg] + list(args) def convert_to_aliases(self) -> list[str | int]: """Converts arguments to a list of string or integer aliases. Returns: The list of aliases. """ return self.path def search_dict_for_path(self, d: dict) -> Any: """Searches a dictionary for the path specified by the alias. Returns: The value at the specified path, or `PydanticUndefined` if the path is not found. """ v = d for k in self.path: if isinstance(v, str): # disallow indexing into a str, like for AliasPath('x', 0) and x='abc' return PydanticUndefined try: v = v[k] except (KeyError, IndexError, TypeError): return PydanticUndefined return v @dataclasses.dataclass(**_internal_dataclass.slots_true) class AliasChoices: """Usage docs: https://docs.pydantic.dev/2.8/concepts/alias#aliaspath-and-aliaschoices A data class used by `validation_alias` as a convenience to create aliases. Attributes: choices: A list containing a string or `AliasPath`. """ choices: list[str | AliasPath] def __init__(self, first_choice: str | AliasPath, *choices: str | AliasPath) -> None: self.choices = [first_choice] + list(choices) def convert_to_aliases(self) -> list[list[str | int]]: """Converts arguments to a list of lists containing string or integer aliases. Returns: The list of aliases. """ aliases: list[list[str | int]] = [] for c in self.choices: if isinstance(c, AliasPath): aliases.append(c.convert_to_aliases()) else: aliases.append([c]) return aliases @dataclasses.dataclass(**_internal_dataclass.slots_true) class AliasGenerator: """Usage docs: https://docs.pydantic.dev/2.8/concepts/alias#using-an-aliasgenerator A data class used by `alias_generator` as a convenience to create various aliases. Attributes: alias: A callable that takes a field name and returns an alias for it. validation_alias: A callable that takes a field name and returns a validation alias for it. serialization_alias: A callable that takes a field name and returns a serialization alias for it. """ alias: Callable[[str], str] | None = None validation_alias: Callable[[str], str | AliasPath | AliasChoices] | None = None serialization_alias: Callable[[str], str] | None = None def _generate_alias( self, alias_kind: Literal['alias', 'validation_alias', 'serialization_alias'], allowed_types: tuple[type[str] | type[AliasPath] | type[AliasChoices], ...], field_name: str, ) -> str | AliasPath | AliasChoices | None: """Generate an alias of the specified kind. Returns None if the alias generator is None. Raises: TypeError: If the alias generator produces an invalid type. """ alias = None if alias_generator := getattr(self, alias_kind): alias = alias_generator(field_name) if alias and not isinstance(alias, allowed_types): raise TypeError( f'Invalid `{alias_kind}` type. `{alias_kind}` generator must produce one of `{allowed_types}`' ) return alias def generate_aliases(self, field_name: str) -> tuple[str | None, str | AliasPath | AliasChoices | None, str | None]: """Generate `alias`, `validation_alias`, and `serialization_alias` for a field. Returns: A tuple of three aliases - validation, alias, and serialization. """ alias = self._generate_alias('alias', (str,), field_name) validation_alias = self._generate_alias('validation_alias', (str, AliasChoices, AliasPath), field_name) serialization_alias = self._generate_alias('serialization_alias', (str,), field_name) return alias, validation_alias, serialization_alias # type: ignore
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