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