mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-09-19 22:07:28 +02:00
414 lines
11 KiB
Python
414 lines
11 KiB
Python
import operator
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from .compat import PY2
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from .compat import PY3
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from .compat import with_metaclass
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from .utils import identity
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class _ProxyMethods(object):
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# We use properties to override the values of __module__ and
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# __doc__. If we add these in ObjectProxy, the derived class
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# __dict__ will still be setup to have string variants of these
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# attributes and the rules of descriptors means that they appear to
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# take precedence over the properties in the base class. To avoid
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# that, we copy the properties into the derived class type itself
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# via a meta class. In that way the properties will always take
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# precedence.
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@property
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def __module__(self):
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return self.__wrapped__.__module__
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@__module__.setter
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def __module__(self, value):
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self.__wrapped__.__module__ = value
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@property
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def __doc__(self):
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return self.__wrapped__.__doc__
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@__doc__.setter
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def __doc__(self, value):
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self.__wrapped__.__doc__ = value
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# We similar use a property for __dict__. We need __dict__ to be
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# explicit to ensure that vars() works as expected.
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@property
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def __dict__(self):
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return self.__wrapped__.__dict__
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# Need to also propagate the special __weakref__ attribute for case
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# where decorating classes which will define this. If do not define
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# it and use a function like inspect.getmembers() on a decorator
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# class it will fail. This can't be in the derived classes.
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@property
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def __weakref__(self):
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return self.__wrapped__.__weakref__
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class _ProxyMetaType(type):
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def __new__(cls, name, bases, dictionary):
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# Copy our special properties into the class so that they
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# always take precedence over attributes of the same name added
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# during construction of a derived class. This is to save
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# duplicating the implementation for them in all derived classes.
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dictionary.update(vars(_ProxyMethods))
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return type.__new__(cls, name, bases, dictionary)
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class Proxy(with_metaclass(_ProxyMetaType)):
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"""
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A proxy implementation in pure Python, using slots. You can subclass this to add
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local methods or attributes, or enable __dict__.
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The most important internals:
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* ``__factory__`` is the callback that "materializes" the object we proxy to.
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* ``__target__`` will contain the object we proxy to, once it's "materialized".
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* ``__wrapped__`` is a property that does either:
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* return ``__target__`` if it's set.
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* calls ``__factory__``, saves result to ``__target__`` and returns said result.
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"""
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__slots__ = '__target__', '__factory__'
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def __init__(self, factory):
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object.__setattr__(self, '__factory__', factory)
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@property
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def __wrapped__(self, __getattr__=object.__getattribute__, __setattr__=object.__setattr__,
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__delattr__=object.__delattr__):
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try:
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return __getattr__(self, '__target__')
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except AttributeError:
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try:
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factory = __getattr__(self, '__factory__')
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except AttributeError:
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raise ValueError("Proxy hasn't been initiated: __factory__ is missing.")
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target = factory()
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__setattr__(self, '__target__', target)
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return target
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@__wrapped__.deleter
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def __wrapped__(self, __delattr__=object.__delattr__):
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__delattr__(self, '__target__')
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@__wrapped__.setter
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def __wrapped__(self, target, __setattr__=object.__setattr__):
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__setattr__(self, '__target__', target)
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@property
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def __name__(self):
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return self.__wrapped__.__name__
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@__name__.setter
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def __name__(self, value):
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self.__wrapped__.__name__ = value
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@property
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def __class__(self):
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return self.__wrapped__.__class__
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@__class__.setter # noqa
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def __class__(self, value):
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self.__wrapped__.__class__ = value
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@property
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def __annotations__(self):
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return self.__wrapped__.__anotations__
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@__annotations__.setter
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def __annotations__(self, value):
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self.__wrapped__.__annotations__ = value
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def __dir__(self):
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return dir(self.__wrapped__)
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def __str__(self):
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return str(self.__wrapped__)
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if PY3:
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def __bytes__(self):
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return bytes(self.__wrapped__)
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def __repr__(self, __getattr__=object.__getattribute__):
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try:
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target = __getattr__(self, '__target__')
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except AttributeError:
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return '<{} at 0x{:x} with factory {!r}>'.format(
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type(self).__name__, id(self),
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self.__factory__
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)
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else:
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return '<{} at 0x{:x} wrapping {!r} at 0x{:x} with factory {!r}>'.format(
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type(self).__name__, id(self),
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target, id(target),
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self.__factory__
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)
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def __reversed__(self):
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return reversed(self.__wrapped__)
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if PY3:
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def __round__(self):
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return round(self.__wrapped__)
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def __lt__(self, other):
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return self.__wrapped__ < other
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def __le__(self, other):
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return self.__wrapped__ <= other
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def __eq__(self, other):
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return self.__wrapped__ == other
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def __ne__(self, other):
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return self.__wrapped__ != other
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def __gt__(self, other):
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return self.__wrapped__ > other
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def __ge__(self, other):
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return self.__wrapped__ >= other
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def __hash__(self):
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return hash(self.__wrapped__)
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def __nonzero__(self):
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return bool(self.__wrapped__)
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def __bool__(self):
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return bool(self.__wrapped__)
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def __setattr__(self, name, value, __setattr__=object.__setattr__):
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if hasattr(type(self), name):
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__setattr__(self, name, value)
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else:
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setattr(self.__wrapped__, name, value)
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def __getattr__(self, name):
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if name in ('__wrapped__', '__factory__'):
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raise AttributeError(name)
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else:
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return getattr(self.__wrapped__, name)
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def __delattr__(self, name, __delattr__=object.__delattr__):
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if hasattr(type(self), name):
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__delattr__(self, name)
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else:
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delattr(self.__wrapped__, name)
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def __add__(self, other):
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return self.__wrapped__ + other
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def __sub__(self, other):
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return self.__wrapped__ - other
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def __mul__(self, other):
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return self.__wrapped__ * other
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def __div__(self, other):
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return operator.div(self.__wrapped__, other)
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def __truediv__(self, other):
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return operator.truediv(self.__wrapped__, other)
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def __floordiv__(self, other):
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return self.__wrapped__ // other
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def __mod__(self, other):
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return self.__wrapped__ % other
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def __divmod__(self, other):
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return divmod(self.__wrapped__, other)
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def __pow__(self, other, *args):
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return pow(self.__wrapped__, other, *args)
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def __lshift__(self, other):
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return self.__wrapped__ << other
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def __rshift__(self, other):
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return self.__wrapped__ >> other
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def __and__(self, other):
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return self.__wrapped__ & other
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def __xor__(self, other):
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return self.__wrapped__ ^ other
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def __or__(self, other):
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return self.__wrapped__ | other
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def __radd__(self, other):
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return other + self.__wrapped__
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def __rsub__(self, other):
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return other - self.__wrapped__
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def __rmul__(self, other):
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return other * self.__wrapped__
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def __rdiv__(self, other):
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return operator.div(other, self.__wrapped__)
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def __rtruediv__(self, other):
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return operator.truediv(other, self.__wrapped__)
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def __rfloordiv__(self, other):
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return other // self.__wrapped__
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def __rmod__(self, other):
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return other % self.__wrapped__
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def __rdivmod__(self, other):
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return divmod(other, self.__wrapped__)
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def __rpow__(self, other, *args):
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return pow(other, self.__wrapped__, *args)
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def __rlshift__(self, other):
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return other << self.__wrapped__
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def __rrshift__(self, other):
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return other >> self.__wrapped__
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def __rand__(self, other):
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return other & self.__wrapped__
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def __rxor__(self, other):
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return other ^ self.__wrapped__
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def __ror__(self, other):
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return other | self.__wrapped__
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def __iadd__(self, other):
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self.__wrapped__ += other
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return self
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def __isub__(self, other):
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self.__wrapped__ -= other
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return self
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def __imul__(self, other):
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self.__wrapped__ *= other
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return self
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def __idiv__(self, other):
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self.__wrapped__ = operator.idiv(self.__wrapped__, other)
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return self
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def __itruediv__(self, other):
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self.__wrapped__ = operator.itruediv(self.__wrapped__, other)
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return self
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def __ifloordiv__(self, other):
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self.__wrapped__ //= other
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return self
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def __imod__(self, other):
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self.__wrapped__ %= other
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return self
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def __ipow__(self, other):
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self.__wrapped__ **= other
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return self
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def __ilshift__(self, other):
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self.__wrapped__ <<= other
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return self
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def __irshift__(self, other):
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self.__wrapped__ >>= other
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return self
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def __iand__(self, other):
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self.__wrapped__ &= other
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return self
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def __ixor__(self, other):
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self.__wrapped__ ^= other
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return self
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def __ior__(self, other):
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self.__wrapped__ |= other
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return self
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def __neg__(self):
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return -self.__wrapped__
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def __pos__(self):
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return +self.__wrapped__
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def __abs__(self):
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return abs(self.__wrapped__)
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def __invert__(self):
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return ~self.__wrapped__
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def __int__(self):
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return int(self.__wrapped__)
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if PY2:
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def __long__(self):
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return long(self.__wrapped__) # noqa
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def __float__(self):
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return float(self.__wrapped__)
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def __oct__(self):
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return oct(self.__wrapped__)
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def __hex__(self):
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return hex(self.__wrapped__)
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def __index__(self):
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return operator.index(self.__wrapped__)
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def __len__(self):
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return len(self.__wrapped__)
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def __contains__(self, value):
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return value in self.__wrapped__
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def __getitem__(self, key):
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return self.__wrapped__[key]
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def __setitem__(self, key, value):
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self.__wrapped__[key] = value
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def __delitem__(self, key):
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del self.__wrapped__[key]
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def __getslice__(self, i, j):
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return self.__wrapped__[i:j]
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def __setslice__(self, i, j, value):
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self.__wrapped__[i:j] = value
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def __delslice__(self, i, j):
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del self.__wrapped__[i:j]
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def __enter__(self):
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return self.__wrapped__.__enter__()
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def __exit__(self, *args, **kwargs):
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return self.__wrapped__.__exit__(*args, **kwargs)
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def __iter__(self):
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return iter(self.__wrapped__)
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def __call__(self, *args, **kwargs):
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return self.__wrapped__(*args, **kwargs)
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def __reduce__(self):
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return identity, (self.__wrapped__,)
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def __reduce_ex__(self, protocol):
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return identity, (self.__wrapped__,)
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