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from collections.abc import Callable
from typing import TypeVar
from ._cru import CRU
from ._const import CRU_PLACEHOLDER
T = TypeVar("T")
_PLACEHOLDER = CRU_PLACEHOLDER
class CruRawFunctions:
@staticmethod
def none(*_v, **_kwargs) -> None:
return None
@staticmethod
def true(*_v, **_kwargs) -> True:
return True
@staticmethod
def false(*_v, **_kwargs) -> 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, b) -> bool:
return a == b
@staticmethod
def not_equal(a, b) -> bool:
return a != b
@staticmethod
def not_(v):
return not v
class CruFunctionMeta:
@staticmethod
def bind(func: Callable, *bind_args, **bind_kwargs) -> Callable:
def bound_func(*args, **kwargs):
popped = 0
real_args = []
for arg in bind_args:
if arg is _PLACEHOLDER:
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
@staticmethod
def chain(*funcs: Callable) -> Callable:
if len(funcs) == 0:
raise ValueError("At least one function is required!")
final_func = funcs[0]
for func in funcs[1:]:
func_copy = func
def chained_func(*args, **kwargs):
results = final_func(*args, **kwargs)
results = results if isinstance(results, tuple) else (results,)
return func_copy(*results)
final_func = chained_func
return final_func
# Advanced Function Wrapper
class CruFunction:
def __init__(self, f: Callable):
self._f = f
@property
def f(self) -> Callable:
return self._f
@property
def func(self) -> Callable:
return self.f
def bind(self, *bind_args, **bind_kwargs) -> "CruFunction":
self._f = CruFunctionMeta.bind(self._f, *bind_args, **bind_kwargs)
return self
def chain(self, *funcs: Callable) -> "CruFunction":
self._f = CruFunctionMeta.chain(self._f, *funcs)
return self
def __call__(self, *args, **kwargs):
return self._f(*args, **kwargs)
@staticmethod
def make_chain(base_func: Callable, *funcs: Callable) -> "CruFunction":
return CruFunction(base_func).chain(*funcs)
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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