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import inspect
from functools import wraps
from inspect import signature
from types import FunctionType
from typing import Callable, Generic, Optional, Type, Union
from apischema.typing import get_type_hints
from apischema.utils import PREFIX, T, get_origin_or_type2
MethodOrProperty = Union[Callable, property]
def _method_location(method: MethodOrProperty) -> Optional[Type]:
if isinstance(method, property):
assert method.fget is not None
method = method.fget
while hasattr(method, "__wrapped__"):
method = method.__wrapped__
assert isinstance(method, FunctionType)
global_name, *class_path = method.__qualname__.split(".")[:-1]
if global_name not in method.__globals__:
return None
location = method.__globals__[global_name]
for attr in class_path:
if hasattr(location, attr):
location = getattr(location, attr)
else:
break
return location
def is_method(method: MethodOrProperty) -> bool:
"""Return if the function is method/property declared in a class"""
return (
isinstance(method, property)
and method.fget is not None
and is_method(method.fget)
) or (
isinstance(method, FunctionType)
and method.__name__ != method.__qualname__
and isinstance(_method_location(method), (type, type(None)))
and next(iter(inspect.signature(method).parameters), None) == "self"
)
def method_class(method: MethodOrProperty) -> Optional[Type]:
cls = _method_location(method)
return cls if isinstance(cls, type) else None
METHOD_WRAPPER_ATTR = f"{PREFIX}method_wrapper"
def method_wrapper(method: MethodOrProperty, name: Optional[str] = None) -> Callable:
if isinstance(method, property):
assert method.fget is not None
name = name or method.fget.__name__
@wraps(method.fget)
def wrapper(self):
assert name is not None
return getattr(self, name)
else:
if hasattr(method, METHOD_WRAPPER_ATTR):
return method
name = name or method.__name__
if list(signature(method).parameters) == ["self"]:
@wraps(method)
def wrapper(self):
assert name is not None
return getattr(self, name)()
else:
@wraps(method)
def wrapper(self, *args, **kwargs):
assert name is not None
return getattr(self, name)(*args, **kwargs)
setattr(wrapper, METHOD_WRAPPER_ATTR, True)
return wrapper
class MethodWrapper(Generic[T]):
def __init__(self, method: T):
self._method = method
def getter(self, func: Callable):
self._method = self._method.getter(func) # type: ignore
return self
def setter(self, func: Callable):
self._method = self._method.setter(func) # type: ignore
return self
def deleter(self, func: Callable):
self._method = self._method.deleter(func) # type: ignore
return self
def __set_name__(self, owner, name):
setattr(owner, name, self._method)
def __call__(self, *args, **kwargs):
raise RuntimeError("Method __set_name__ has not been called")
def method_registerer(
arg: Optional[Callable],
owner: Optional[Type],
register: Callable[[Callable, Type, str], None],
):
def decorator(method: MethodOrProperty):
if owner is None and is_method(method) and method_class(method) is None:
class Descriptor(MethodWrapper[MethodOrProperty]):
def __set_name__(self, owner, name):
super().__set_name__(owner, name)
register(method_wrapper(method), owner, name)
return Descriptor(method)
else:
owner2 = owner
if is_method(method):
if owner2 is None:
owner2 = method_class(method)
method = method_wrapper(method)
if owner2 is None:
try:
hints = get_type_hints(method)
owner2 = get_origin_or_type2(hints[next(iter(hints))])
except (KeyError, StopIteration):
raise TypeError("First parameter of method must be typed") from None
assert not isinstance(method, property)
register(method, owner2, method.__name__)
return method
return decorator if arg is None else decorator(arg)
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