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# This file is borrowed from the Expression library, licensed under the MIT license. | ||
# https://github.com/cognitedata/Expression | ||
from typing import Any, Callable, Tuple, TypeVar, overload | ||
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from typing_extensions import Concatenate, Literal, ParamSpec | ||
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_P = ParamSpec("_P") | ||
_A = TypeVar("_A") | ||
_B = TypeVar("_B") | ||
_C = TypeVar("_C") | ||
_D = TypeVar("_D") | ||
_E = TypeVar("_E") | ||
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_Arity = Literal[0, 1, 2, 3, 4] | ||
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def _curry( | ||
args: Tuple[Any, ...], arity: int, fun: Callable[..., Any] | ||
) -> Callable[..., Any]: | ||
def wrapper(*args_: Any, **kw: Any) -> Any: | ||
if arity == 1: | ||
return fun(*args, *args_, **kw) | ||
return _curry(args + args_, arity - 1, fun) | ||
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return wrapper | ||
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@overload | ||
def curry(num_args: Literal[0]) -> Callable[[Callable[_P, _B]], Callable[_P, _B]]: | ||
... | ||
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@overload | ||
def curry( | ||
num_args: Literal[1], | ||
) -> Callable[[Callable[Concatenate[_A, _P], _B]], Callable[[_A], Callable[_P, _B]]]: | ||
... | ||
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@overload | ||
def curry( | ||
num_args: Literal[2], | ||
) -> Callable[ | ||
[Callable[Concatenate[_A, _B, _P], _C]], | ||
Callable[ | ||
[_A], | ||
Callable[ | ||
[_B], | ||
Callable[_P, _C], | ||
], | ||
], | ||
]: | ||
... | ||
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@overload | ||
def curry( | ||
num_args: Literal[3], | ||
) -> Callable[ | ||
[Callable[Concatenate[_A, _B, _C, _P], _D]], | ||
Callable[ | ||
[_A], | ||
Callable[ | ||
[_B], | ||
Callable[ | ||
[_C], | ||
Callable[_P, _D], | ||
], | ||
], | ||
], | ||
]: | ||
... | ||
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@overload | ||
def curry( | ||
num_args: Literal[4], | ||
) -> Callable[ | ||
[Callable[Concatenate[_A, _B, _C, _D, _P], _E]], | ||
Callable[ | ||
[_A], | ||
Callable[ | ||
[_B], | ||
Callable[ | ||
[_C], | ||
Callable[[_D], Callable[_P, _E]], | ||
], | ||
], | ||
], | ||
]: | ||
... | ||
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def curry(num_args: _Arity) -> Callable[..., Any]: | ||
"""A curry decorator. | ||
Makes a function curried. | ||
Args: | ||
num_args: The number of args to curry from the start of the | ||
function | ||
Example: | ||
>>> @curry(1) | ||
... def add(a: int, b: int) -> int: | ||
... return a + b | ||
>>> | ||
>>> assert add(3)(4) == 7 | ||
""" | ||
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def wrapper(fun: Callable[..., Any]) -> Callable[..., Any]: | ||
return _curry((), num_args + 1, fun) | ||
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return wrapper | ||
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@overload | ||
def curry_flip( | ||
num_args: Literal[0], | ||
) -> Callable[[Callable[_P, _A]], Callable[_P, _A]]: | ||
... | ||
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@overload | ||
def curry_flip( | ||
num_args: Literal[1], | ||
) -> Callable[[Callable[Concatenate[_A, _P], _B]], Callable[_P, Callable[[_A], _B]]]: | ||
... | ||
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@overload | ||
def curry_flip( | ||
num_args: Literal[2], | ||
) -> Callable[ | ||
[Callable[Concatenate[_A, _B, _P], _C]], | ||
Callable[ | ||
_P, | ||
Callable[ | ||
[_A], | ||
Callable[[_B], _C], | ||
], | ||
], | ||
]: | ||
... | ||
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@overload | ||
def curry_flip( | ||
num_args: Literal[3], | ||
) -> Callable[ | ||
[Callable[Concatenate[_A, _B, _C, _P], _D]], | ||
Callable[ | ||
_P, | ||
Callable[ | ||
[_A], | ||
Callable[ | ||
[_B], | ||
Callable[[_C], _D], | ||
], | ||
], | ||
], | ||
]: | ||
... | ||
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@overload | ||
def curry_flip( | ||
num_args: Literal[4], | ||
) -> Callable[ | ||
[Callable[Concatenate[_A, _B, _C, _D, _P], _E]], | ||
Callable[ | ||
_P, | ||
Callable[ | ||
[_A], | ||
Callable[ | ||
[_B], | ||
Callable[[_C], Callable[[_D], _E]], | ||
], | ||
], | ||
], | ||
]: | ||
... | ||
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def curry_flip( | ||
num_args: _Arity, | ||
) -> Callable[[Callable[..., Any]], Callable[..., Any]]: | ||
"""A flipped curry decorator. | ||
Makes a function curried, but flips the curried arguments to become | ||
the last arguments. This is very nice when having e.g optional | ||
arguments after a source argument that will be piped. | ||
Args: | ||
num_args: The number of args to curry from the start of the | ||
function | ||
Example: | ||
>>> @curry_flip(1) | ||
... def map(source: List[int], mapper: Callable[[int], int]): | ||
... return [mapper(x) for x in source] | ||
>>> | ||
>>> ys = pipe(xs, map(lambda x: x * 10)) | ||
""" | ||
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def _wrap_fun(fun: Callable[..., Any]) -> Callable[..., Any]: | ||
def _wrap_args(*args: Any, **kwargs: Any) -> Callable[..., Any]: | ||
def _wrap_curried(*curry_args: Any) -> Any: | ||
return fun(*curry_args, *args, **kwargs) | ||
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return _curry((), num_args, _wrap_curried) | ||
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return _wrap_args if num_args else fun | ||
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return _wrap_fun | ||
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__all__ = ["curry", "curry_flip"] |
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