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Viewing File: simple.py
import operator
from .compat import string_types
from .compat import with_metaclass
from .utils import await_
from .utils import cached_property
from .utils import identity
def make_proxy_method(code):
def proxy_wrapper(self, *args):
return code(self.__wrapped__, *args)
return proxy_wrapper
class _ProxyMethods(object):
# We use properties to override the values of __module__ and
# __doc__. If we add these in ObjectProxy, the derived class
# __dict__ will still be setup to have string variants of these
# attributes and the rules of descriptors means that they appear to
# take precedence over the properties in the base class. To avoid
# that, we copy the properties into the derived class type itself
# via a meta class. In that way the properties will always take
# precedence.
@property
def __module__(self):
return self.__wrapped__.__module__
@__module__.setter
def __module__(self, value):
self.__wrapped__.__module__ = value
@property
def __doc__(self):
return self.__wrapped__.__doc__
@__doc__.setter
def __doc__(self, value):
self.__wrapped__.__doc__ = value
# Need to also propagate the special __weakref__ attribute for case
# where decorating classes which will define this. If do not define
# it and use a function like inspect.getmembers() on a decorator
# class it will fail. This can't be in the derived classes.
@property
def __weakref__(self):
return self.__wrapped__.__weakref__
class _ProxyMetaType(type):
def __new__(cls, name, bases, dictionary):
# Copy our special properties into the class so that they
# always take precedence over attributes of the same name added
# during construction of a derived class. This is to save
# duplicating the implementation for them in all derived classes.
dictionary.update(vars(_ProxyMethods))
dictionary.pop('__dict__')
return type.__new__(cls, name, bases, dictionary)
class Proxy(with_metaclass(_ProxyMetaType)):
__factory__ = None
def __init__(self, factory):
self.__dict__['__factory__'] = factory
@property
def __resolved__(self):
return '__wrapped__' in self.__dict__
@cached_property
def __wrapped__(self):
self = self.__dict__
if '__factory__' in self:
factory = self['__factory__']
return factory()
else:
raise ValueError("Proxy hasn't been initiated: __factory__ is missing.")
__name__ = property(make_proxy_method(operator.attrgetter('__name__')))
__class__ = property(make_proxy_method(operator.attrgetter('__class__')))
__annotations__ = property(make_proxy_method(operator.attrgetter('__anotations__')))
__dir__ = make_proxy_method(dir)
__str__ = make_proxy_method(str)
__bytes__ = make_proxy_method(bytes)
def __repr__(self, __getattr__=object.__getattribute__):
if '__wrapped__' in self.__dict__:
return '<{} at 0x{:x} wrapping {!r} at 0x{:x} with factory {!r}>'.format(
type(self).__name__, id(self), self.__wrapped__, id(self.__wrapped__), self.__factory__
)
else:
return '<{} at 0x{:x} with factory {!r}>'.format(type(self).__name__, id(self), self.__factory__)
def __fspath__(self):
wrapped = self.__wrapped__
if isinstance(wrapped, string_types):
return wrapped
else:
fspath = getattr(wrapped, '__fspath__', None)
if fspath is None:
return wrapped
else:
return fspath()
__reversed__ = make_proxy_method(reversed)
__round__ = make_proxy_method(round)
__lt__ = make_proxy_method(operator.lt)
__le__ = make_proxy_method(operator.le)
__eq__ = make_proxy_method(operator.eq)
__ne__ = make_proxy_method(operator.ne)
__gt__ = make_proxy_method(operator.gt)
__ge__ = make_proxy_method(operator.ge)
__hash__ = make_proxy_method(hash)
__nonzero__ = make_proxy_method(bool)
__bool__ = make_proxy_method(bool)
def __setattr__(self, name, value):
if hasattr(type(self), name):
self.__dict__[name] = value
else:
setattr(self.__wrapped__, name, value)
def __getattr__(self, name):
if name in ('__wrapped__', '__factory__'):
raise AttributeError(name)
else:
return getattr(self.__wrapped__, name)
def __delattr__(self, name):
if hasattr(type(self), name):
del self.__dict__[name]
else:
delattr(self.__wrapped__, name)
__add__ = make_proxy_method(operator.add)
__sub__ = make_proxy_method(operator.sub)
__mul__ = make_proxy_method(operator.mul)
__matmul__ = make_proxy_method(operator.matmul)
__truediv__ = make_proxy_method(operator.truediv)
__floordiv__ = make_proxy_method(operator.floordiv)
__mod__ = make_proxy_method(operator.mod)
__divmod__ = make_proxy_method(divmod)
__pow__ = make_proxy_method(pow)
__lshift__ = make_proxy_method(operator.lshift)
__rshift__ = make_proxy_method(operator.rshift)
__and__ = make_proxy_method(operator.and_)
__xor__ = make_proxy_method(operator.xor)
__or__ = make_proxy_method(operator.or_)
def __radd__(self, other):
return other + self.__wrapped__
def __rsub__(self, other):
return other - self.__wrapped__
def __rmul__(self, other):
return other * self.__wrapped__
def __rmatmul__(self, other):
return other @ self.__wrapped__
def __rdiv__(self, other):
return operator.div(other, self.__wrapped__)
def __rtruediv__(self, other):
return operator.truediv(other, self.__wrapped__)
def __rfloordiv__(self, other):
return other // self.__wrapped__
def __rmod__(self, other):
return other % self.__wrapped__
def __rdivmod__(self, other):
return divmod(other, self.__wrapped__)
def __rpow__(self, other, *args):
return pow(other, self.__wrapped__, *args)
def __rlshift__(self, other):
return other << self.__wrapped__
def __rrshift__(self, other):
return other >> self.__wrapped__
def __rand__(self, other):
return other & self.__wrapped__
def __rxor__(self, other):
return other ^ self.__wrapped__
def __ror__(self, other):
return other | self.__wrapped__
__iadd__ = make_proxy_method(operator.iadd)
__isub__ = make_proxy_method(operator.isub)
__imul__ = make_proxy_method(operator.imul)
__imatmul__ = make_proxy_method(operator.imatmul)
__itruediv__ = make_proxy_method(operator.itruediv)
__ifloordiv__ = make_proxy_method(operator.ifloordiv)
__imod__ = make_proxy_method(operator.imod)
__ipow__ = make_proxy_method(operator.ipow)
__ilshift__ = make_proxy_method(operator.ilshift)
__irshift__ = make_proxy_method(operator.irshift)
__iand__ = make_proxy_method(operator.iand)
__ixor__ = make_proxy_method(operator.ixor)
__ior__ = make_proxy_method(operator.ior)
__neg__ = make_proxy_method(operator.neg)
__pos__ = make_proxy_method(operator.pos)
__abs__ = make_proxy_method(operator.abs)
__invert__ = make_proxy_method(operator.invert)
__int__ = make_proxy_method(int)
__float__ = make_proxy_method(float)
__oct__ = make_proxy_method(oct)
__hex__ = make_proxy_method(hex)
def __index__(self):
if hasattr(self.__wrapped__, '__index__'):
return operator.index(self.__wrapped__)
else:
return int(self.__wrapped__)
__len__ = make_proxy_method(len)
__contains__ = make_proxy_method(operator.contains)
__getitem__ = make_proxy_method(operator.getitem)
__setitem__ = make_proxy_method(operator.setitem)
__delitem__ = make_proxy_method(operator.delitem)
def __enter__(self):
return self.__wrapped__.__enter__()
def __exit__(self, *args, **kwargs):
return self.__wrapped__.__exit__(*args, **kwargs)
__iter__ = make_proxy_method(iter)
def __call__(self, *args, **kwargs):
return self.__wrapped__(*args, **kwargs)
def __reduce__(self):
return identity, (self.__wrapped__,)
def __reduce_ex__(self, protocol):
return identity, (self.__wrapped__,)
if await_:
from .utils import __aenter__
from .utils import __aexit__
from .utils import __aiter__
from .utils import __anext__
from .utils import __await__
__aiter__, __anext__, __await__, __aenter__, __aexit__ # noqa
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