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import typing
from functools import lru_cache
from typish.functions._is_from_typing import is_from_typing
from typish._types import T
@lru_cache()
def get_alias(cls: T) -> typing.Optional[T]:
"""
Return the alias from the ``typing`` module for ``cls``. For example, for
``cls=list``, the result would be ``typing.List``. If ``cls`` is
parameterized (>=3.9), then a parameterized ``typing`` equivalent is
returned. If no alias exists for ``cls``, then ``None`` is returned.
If ``cls`` already is from ``typing`` it is returned as is.
:param cls: the type for which the ``typing`` equivalent is to be found.
:return: the alias from ``typing``.
"""
if is_from_typing(cls):
return cls
alias = _alias_per_type.get(cls.__name__, None)
if alias:
args = getattr(cls, '__args__', tuple())
if args:
alias = alias[args]
return alias
_alias_per_type = {
'list': typing.List,
'tuple': typing.Tuple,
'dict': typing.Dict,
'set': typing.Set,
'frozenset': typing.FrozenSet,
'deque': typing.Deque,
'defaultdict': typing.DefaultDict,
'type': typing.Type,
'Set': typing.AbstractSet,
}