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from collections.abc import Callable
from typing import TypeVar
from returns.interfaces.specific.ioresult import IOResultLikeN
from returns.primitives.hkt import Kind3, Kinded, kinded
from returns.result import Result
_FirstType = TypeVar('_FirstType')
_NewFirstType = TypeVar('_NewFirstType')
_SecondType = TypeVar('_SecondType')
_ThirdType = TypeVar('_ThirdType')
_IOResultLikeKind = TypeVar('_IOResultLikeKind', bound=IOResultLikeN)
def compose_result(
function: Callable[
[Result[_FirstType, _SecondType]],
Kind3[_IOResultLikeKind, _NewFirstType, _SecondType, _ThirdType],
],
) -> Kinded[
Callable[
[Kind3[_IOResultLikeKind, _FirstType, _SecondType, _ThirdType]],
Kind3[_IOResultLikeKind, _NewFirstType, _SecondType, _ThirdType],
]
]:
"""
Composes inner ``Result`` with ``IOResultLike`` returning function.
Can be useful when you need an access to both states of the result.
.. code:: python
>>> from returns.io import IOResult, IOSuccess, IOFailure
>>> from returns.pointfree import compose_result
>>> from returns.result import Result
>>> def modify_string(container: Result[str, str]) -> IOResult[str, str]:
... return IOResult.from_result(
... container.map(str.upper).alt(str.lower),
... )
>>> assert compose_result(modify_string)(
... IOSuccess('success')
... ) == IOSuccess('SUCCESS')
>>> assert compose_result(modify_string)(
... IOFailure('FAILURE')
... ) == IOFailure('failure')
"""
@kinded
def factory(
container: Kind3[
_IOResultLikeKind,
_FirstType,
_SecondType,
_ThirdType,
],
) -> Kind3[_IOResultLikeKind, _NewFirstType, _SecondType, _ThirdType]:
return container.compose_result(function)
return factory
|
