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from __future__ import annotations
from collections.abc import Callable
from enum import Flag, auto
from typing import (
Any,
Generic,
Iterable,
Literal,
ParamSpec,
TypeAlias,
TypeVar,
cast,
)
from ._cru import CRU
from ._const import CruPlaceholder
_P = ParamSpec("_P")
_T = TypeVar("_T")
_ArgsChainableCallable: TypeAlias = Callable[..., Iterable[Any]]
_KwargsChainableCallable: TypeAlias = Callable[..., Iterable[tuple[str, Any]]]
_ChainableCallable: TypeAlias = Callable[
..., tuple[Iterable[Any], Iterable[tuple[str, Any]]]
]
class CruFunctionMeta:
class Base:
@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
@staticmethod
def bind(func: Callable[..., _T], *bind_args, **bind_kwargs) -> Callable[..., _T]:
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 = _ArgsChainableCallable
KwargsChainableCallable = _KwargsChainableCallable
ChainableCallable = _ChainableCallable
@staticmethod
def chain_with_args(
funcs: Iterable[_ArgsChainableCallable], *bind_args, **bind_kwargs
) -> _ArgsChainableCallable:
def chained_func(*args):
for func in funcs:
args = CruFunctionMeta.bind(func, *bind_args, **bind_kwargs)(*args)
return args
return chained_func
@staticmethod
def chain_with_kwargs(
funcs: Iterable[_KwargsChainableCallable], *bind_args, **bind_kwargs
) -> _KwargsChainableCallable:
def chained_func(**kwargs):
for func in funcs:
kwargs = CruFunctionMeta.bind(func, *bind_args, **bind_kwargs)(**kwargs)
return kwargs
return chained_func
@staticmethod
def chain_with_both(
funcs: Iterable[_ChainableCallable], *bind_args, **bind_kwargs
) -> _ChainableCallable:
def chained_func(*args, **kwargs):
for func in funcs:
args, kwargs = CruFunctionMeta.bind(func, *bind_args, **bind_kwargs)(
*args, **kwargs
)
return args, kwargs
return chained_func
@staticmethod
def chain(
mode: ChainMode,
funcs: Iterable[
_ArgsChainableCallable | _KwargsChainableCallable | _ChainableCallable
],
*bind_args,
**bind_kwargs,
) -> _ArgsChainableCallable | _KwargsChainableCallable | _ChainableCallable:
if mode == CruFunctionMeta.ChainMode.ARGS:
return CruFunctionMeta.chain_with_args(
cast(Iterable[_ArgsChainableCallable], funcs),
*bind_args,
**bind_kwargs,
)
elif mode == CruFunctionMeta.ChainMode.KWARGS:
return CruFunctionMeta.chain_with_kwargs(
cast(Iterable[_KwargsChainableCallable], funcs),
*bind_args,
**bind_kwargs,
)
elif mode == CruFunctionMeta.ChainMode.BOTH:
return CruFunctionMeta.chain_with_both(
cast(Iterable[_ChainableCallable], funcs), *bind_args, **bind_kwargs
)
class CruFunction(Generic[_P, _T]):
def __init__(self, f: Callable[_P, _T]):
self._f = f
@property
def me(self) -> Callable[_P, _T]:
return self._f
def bind(self, *bind_args, **bind_kwargs) -> CruFunction[..., _T]:
return CruFunction(CruFunctionMeta.bind(self._f, *bind_args, **bind_kwargs))
def _iter_with_self(
self, funcs: Iterable[Callable[..., Any]]
) -> Iterable[Callable[..., Any]]:
yield self
yield from funcs
@staticmethod
def chain_with_args(
self,
funcs: Iterable[_ArgsChainableCallable],
*bind_args,
**bind_kwargs,
) -> _ArgsChainableCallable:
return CruFunction(
CruFunctionMeta.chain_with_args(
self._iter_with_self(funcs), *bind_args, **bind_kwargs
)
)
def chain_with_kwargs(
self, funcs: Iterable[_KwargsChainableCallable], *bind_args, **bind_kwargs
) -> _KwargsChainableCallable:
return CruFunction(
CruFunctionMeta.chain_with_kwargs(
self._iter_with_self(funcs), *bind_args, **bind_kwargs
)
)
def chain_with_both(
self, funcs: Iterable[_ChainableCallable], *bind_args, **bind_kwargs
) -> _ChainableCallable:
return CruFunction(
CruFunctionMeta.chain_with_both(
self._iter_with_self(funcs), *bind_args, **bind_kwargs
)
)
def chain(
self,
mode: CruFunctionChainMode,
funcs: Iterable[
_ArgsChainableCallable | _KwargsChainableCallable | _ChainableCallable
],
*bind_args,
**bind_kwargs,
) -> _ArgsChainableCallable | _KwargsChainableCallable | _ChainableCallable:
return CruFunction(
CruFunctionMeta.chain(
mode, self._iter_with_self(funcs), *bind_args, **bind_kwargs
)
)
def __call__(self, *args: _P.args, **kwargs: _P.kwargs) -> _T:
return self._f(*args, **kwargs)
@staticmethod
def make_chain(
mode: CruFunctionChainMode,
funcs: Iterable[
_ArgsChainableCallable | _KwargsChainableCallable | _ChainableCallable
],
*bind_args,
**bind_kwargs,
) -> CruFunction:
return CruFunction(
CruFunctionMeta.chain(mode, funcs, *bind_args, **bind_kwargs)
)
class CruWrappedFunctions:
none = CruFunction(CruRawFunctions.none)
true = CruFunction(CruRawFunctions.true)
false = CruFunction(CruRawFunctions.false)
identity = CruFunction(CruRawFunctions.identity)
only_you = CruFunction(CruRawFunctions.only_you)
equal = CruFunction(CruRawFunctions.equal)
not_equal = CruFunction(CruRawFunctions.not_equal)
not_ = CruFunction(CruRawFunctions.not_)
class CruFunctionGenerators:
@staticmethod
def make_isinstance_of_types(*types: type) -> Callable:
return CruFunction(lambda v: type(v) in types)
CRU.add_objects(
CruRawFunctions,
CruFunctionMeta,
CruFunction,
CruWrappedFunctions,
CruFunctionGenerators,
)
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