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from __future__ import annotations
from collections.abc import Callable
from typing import TYPE_CHECKING, TypeVar
from returns.interfaces.specific.ioresult import IOResultLikeN
from returns.primitives.hkt import Kinded, KindN, kinded
if TYPE_CHECKING:
from returns.io import IOResult # noqa: WPS433
_FirstType = TypeVar('_FirstType')
_SecondType = TypeVar('_SecondType')
_ThirdType = TypeVar('_ThirdType')
_UpdatedType = TypeVar('_UpdatedType')
_IOResultLikeKind = TypeVar('_IOResultLikeKind', bound=IOResultLikeN)
def bind_ioresult(
function: Callable[[_FirstType], IOResult[_UpdatedType, _SecondType]],
) -> Kinded[
Callable[
[KindN[_IOResultLikeKind, _FirstType, _SecondType, _ThirdType]],
KindN[_IOResultLikeKind, _UpdatedType, _SecondType, _ThirdType],
]
]:
"""
Composes successful container with a function that returns a container.
In other words, it modifies the function's
signature from:
``a -> IOResult[b, c]``
to:
``Container[a, c] -> Container[b, c]``
.. code:: python
>>> from returns.io import IOResult, IOSuccess
>>> from returns.context import RequiresContextIOResult
>>> from returns.pointfree import bind_ioresult
>>> def returns_ioresult(arg: int) -> IOResult[int, str]:
... return IOSuccess(arg + 1)
>>> bound = bind_ioresult(returns_ioresult)
>>> assert bound(IOSuccess(1)) == IOSuccess(2)
>>> assert bound(
... RequiresContextIOResult.from_value(1),
... )(...) == IOSuccess(2)
"""
@kinded
def factory(
container: KindN[
_IOResultLikeKind,
_FirstType,
_SecondType,
_ThirdType,
],
) -> KindN[_IOResultLikeKind, _UpdatedType, _SecondType, _ThirdType]:
return container.bind_ioresult(function)
return factory
|
