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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2026-06-08 18:08
gen	[ DIR ]	drwxr-xr-x	2026-06-08 18:08
preconf	[ DIR ]	drwxr-xr-x	2026-06-08 18:08
strategies	[ DIR ]	drwxr-xr-x	2026-06-08 18:08
LICENSE	1.05 KB	-rw-r--r--	1980-01-01 08:00
__init__.py	1.86 KB	-rw-r--r--	1980-01-01 08:00
_compat.py	12.66 KB	-rw-r--r--	1980-01-01 08:00
_generics.py	966 B	-rw-r--r--	1980-01-01 08:00
cols.py	10.11 KB	-rw-r--r--	1980-01-01 08:00
converters.py	53.97 KB	-rw-r--r--	1980-01-01 08:00
disambiguators.py	6.7 KB	-rw-r--r--	1980-01-01 08:00
dispatch.py	6.62 KB	-rw-r--r--	1980-01-01 08:00
errors.py	4.24 KB	-rw-r--r--	1980-01-01 08:00
fns.py	626 B	-rw-r--r--	1980-01-01 08:00
literals.py	331 B	-rw-r--r--	1980-01-01 08:00
py.typed	0 B	-rw-r--r--	1980-01-01 08:00
subclasses.py	783 B	-rw-r--r--	1980-01-01 08:00
typealiases.py	1.58 KB	-rw-r--r--	1980-01-01 08:00
types.py	278 B	-rw-r--r--	1980-01-01 08:00
v.py	4.03 KB	-rw-r--r--	1980-01-01 08:00

Rename

"""Utilities for type aliases."""

from __future__ import annotations

import sys
from typing import TYPE_CHECKING, Any

from ._compat import is_generic
from ._generics import deep_copy_with
from .dispatch import StructureHook
from .gen._generics import generate_mapping

if TYPE_CHECKING:
    from .converters import BaseConverter

__all__ = ["get_type_alias_base", "is_type_alias", "type_alias_structure_factory"]

if sys.version_info >= (3, 12):
    from types import GenericAlias
    from typing import TypeAliasType

def is_type_alias(type: Any) -> bool:
        """Is this a PEP 695 type alias?"""
        return isinstance(
            type.__origin__ if type.__class__ is GenericAlias else type, TypeAliasType
        )

else:

def is_type_alias(type: Any) -> bool:
        """Is this a PEP 695 type alias?"""
        return False

def get_type_alias_base(type: Any) -> Any:
    """
    What is this a type alias of?

Works only on 3.12+.
    """
    return type.__value__

def type_alias_structure_factory(type: Any, converter: BaseConverter) -> StructureHook:
    base = get_type_alias_base(type)
    if is_generic(type):
        mapping = generate_mapping(type)
        if base.__name__ in mapping:
            # Probably just type T = T
            base = mapping[base.__name__]
        else:
            base = deep_copy_with(base, mapping)
    res = converter.get_structure_hook(base)
    if res == converter._structure_call:
        # we need to replace the type arg of `structure_call`
        return lambda v, _, __base=base: __base(v)
    return lambda v, _, __base=base: res(v, __base)