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from __future__ import annotations
from collections.abc import Callable, Iterable
from enum import Flag, auto
from typing import (
Any,
Generic,
Literal,
ParamSpec,
TypeAlias,
TypeVar,
)
from ._base import CRU
from ._const import CruPlaceholder
_P = ParamSpec("_P")
_P1 = ParamSpec("_P1")
_T = TypeVar("_T")
class _Dec:
@staticmethod
def wrap(
origin: Callable[_P, Callable[_P1, _T]]
) -> Callable[_P, _Wrapper[_P1, _T]]:
def _wrapped(*args: _P.args, **kwargs: _P.kwargs) -> _Wrapper[_P1, _T]:
return _Wrapper(origin(*args, **kwargs))
return _wrapped
class _RawBase:
@staticmethod
def none(*_v, **_kwargs) -> None:
return None
@staticmethod
def true(*_v, **_kwargs) -> Literal[True]:
return True
@staticmethod
def false(*_v, **_kwargs) -> Literal[False]:
return False
@staticmethod
def identity(v: _T) -> _T:
return v
@staticmethod
def only_you(v: _T, *_v, **_kwargs) -> _T:
return v
@staticmethod
def equal(a: Any, b: Any) -> bool:
return a == b
@staticmethod
def not_equal(a: Any, b: Any) -> bool:
return a != b
@staticmethod
def not_(v: Any) -> Any:
return not v
class _Wrapper(Generic[_P, _T]):
def __init__(self, f: Callable[_P, _T]):
self._f = f
@property
def me(self) -> Callable[_P, _T]:
return self._f
def __call__(self, *args: _P.args, **kwargs: _P.kwargs) -> _T:
return self._f(*args, **kwargs)
@_Dec.wrap
def bind(self, *bind_args, **bind_kwargs) -> Callable[..., _T]:
func = self.me
def bound_func(*args, **kwargs):
popped = 0
real_args = []
for arg in bind_args:
if CruPlaceholder.check(arg):
real_args.append(args[popped])
popped += 1
else:
real_args.append(arg)
real_args.extend(args[popped:])
return func(*real_args, **(bind_kwargs | kwargs))
return bound_func
class ChainMode(Flag):
ARGS = auto()
KWARGS = auto()
BOTH = ARGS | KWARGS
ArgsChainableCallable: TypeAlias = Callable[..., Iterable[Any]]
KwargsChainableCallable: TypeAlias = Callable[..., Iterable[tuple[str, Any]]]
ChainableCallable: TypeAlias = Callable[
..., tuple[Iterable[Any], Iterable[tuple[str, Any]]]
]
@_Dec.wrap
def chain_with_args(
self, funcs: Iterable[ArgsChainableCallable], *bind_args, **bind_kwargs
) -> ArgsChainableCallable:
def chained_func(*args):
args = self.bind(*bind_args, **bind_kwargs)(*args)
for func in funcs:
args = _Wrapper(func).bind(*bind_args, **bind_kwargs)(*args)
return args
return chained_func
@_Dec.wrap
def chain_with_kwargs(
self, funcs: Iterable[KwargsChainableCallable], *bind_args, **bind_kwargs
) -> KwargsChainableCallable:
def chained_func(**kwargs):
kwargs = self.bind(*bind_args, **bind_kwargs)(**kwargs)
for func in funcs:
kwargs = _Wrapper(func).bind(func, *bind_args, **bind_kwargs)(**kwargs)
return kwargs
return chained_func
@_Dec.wrap
def chain_with_both(
self, funcs: Iterable[ChainableCallable], *bind_args, **bind_kwargs
) -> ChainableCallable:
def chained_func(*args, **kwargs):
for func in funcs:
args, kwargs = _Wrapper(func).bind(func, *bind_args, **bind_kwargs)(
*args, **kwargs
)
return args, kwargs
return chained_func
class _Base:
none = _Wrapper(_RawBase.none)
true = _Wrapper(_RawBase.true)
false = _Wrapper(_RawBase.false)
identity = _Wrapper(_RawBase.identity)
only_you = _Wrapper(_RawBase.only_you)
equal = _Wrapper(_RawBase.equal)
not_equal = _Wrapper(_RawBase.not_equal)
not_ = _Wrapper(_RawBase.not_)
class _Creators:
@staticmethod
def make_isinstance_of_types(*types: type) -> Callable:
return _Wrapper(lambda v: type(v) in types)
class CruFunction:
RawBase: TypeAlias = _RawBase
Base: TypeAlias = _Base
Creators: TypeAlias = _Creators
Wrapper: TypeAlias = _Wrapper
Decorators: TypeAlias = _Dec
CRU.add_objects(CruFunction)
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