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agriconnect / opbeat   python

Repository URL to install this package:

/ utils / wrapt / wrappers.py

import sys
import functools
import operator
import weakref
import inspect

PY2 = sys.version_info[0] == 2
PY3 = sys.version_info[0] == 3

if PY3:
    string_types = str,
else:
    string_types = basestring,

def with_metaclass(meta, *bases):
    """Create a base class with a metaclass."""
    return meta("NewBase", bases, {})

class _ObjectProxyMethods(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

    # We similar use a property for __dict__. We need __dict__ to be
    # explicit to ensure that vars() works as expected.

    @property
    def __dict__(self):
        return self.__wrapped__.__dict__

    # 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 _ObjectProxyMetaType(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(_ObjectProxyMethods))

         return type.__new__(cls, name, bases, dictionary)

class ObjectProxy(with_metaclass(_ObjectProxyMetaType)):

    __slots__ = '__wrapped__'

    def __init__(self, wrapped):
        object.__setattr__(self, '__wrapped__', wrapped)

        # Python 3.2+ has the __qualname__ attribute, but it does not
        # allow it to be overridden using a property and it must instead
        # be an actual string object instead.

        try:
            object.__setattr__(self, '__qualname__', wrapped.__qualname__)
        except AttributeError:
            pass

    @property
    def __name__(self):
        return self.__wrapped__.__name__

    @__name__.setter
    def __name__(self, value):
        self.__wrapped__.__name__ = value

    @property
    def __class__(self):
        return self.__wrapped__.__class__

    @__class__.setter
    def __class__(self, value):
        self.__wrapped__.__class__ = value

    @property
    def __annotations__(self):
        return self.__wrapped__.__anotations__

    @__annotations__.setter
    def __annotations__(self, value):
        self.__wrapped__.__annotations__ = value

    def __dir__(self):
        return dir(self.__wrapped__)

    def __str__(self):
        return str(self.__wrapped__)

    if PY3:
        def __bytes__(self):
            return bytes(self.__wrapped__)

    def __repr__(self):
        return '<%s at 0x%x for %s at 0x%x>' % (
                type(self).__name__, id(self),
                type(self.__wrapped__).__name__,
                id(self.__wrapped__))

    def __reversed__(self):
        return reversed(self.__wrapped__)

    if PY3:
        def __round__(self):
            return round(self.__wrapped__)

    def __lt__(self, other):
        return self.__wrapped__ < other

    def __le__(self, other):
        return self.__wrapped__ <= other

    def __eq__(self, other):
        return self.__wrapped__ == other

    def __ne__(self, other):
        return self.__wrapped__ != other

    def __gt__(self, other):
        return self.__wrapped__ > other

    def __ge__(self, other):
        return self.__wrapped__ >= other

    def __hash__(self):
        return hash(self.__wrapped__)

    def __nonzero__(self):
        return bool(self.__wrapped__)

    def __bool__(self):
        return bool(self.__wrapped__)

    def __setattr__(self, name, value):
        if name.startswith('_self_'):
            object.__setattr__(self, name, value)

        elif name == '__wrapped__':
            object.__setattr__(self, name, value)
            try:
                object.__delattr__(self, '__qualname__')
            except AttributeError:
                pass
            object.__setattr__(self, name, value)
            try:
                object.__setattr__(self, '__qualname__', value.__qualname__)
            except AttributeError:
                pass

        elif name == '__qualname__':
            setattr(self.__wrapped__, name, value)
            object.__setattr__(self, name, value)

        elif hasattr(type(self), name):
            object.__setattr__(self, name, value)

        else:
            setattr(self.__wrapped__, name, value)

    def __getattr__(self, name):
        # If we are being to lookup '__wrapped__' then the
        # '__init__()' method cannot have been called.

        if name == '__wrapped__':
            raise ValueError('wrapper has not been initialised')

        return getattr(self.__wrapped__, name)

    def __delattr__(self, name):
        if name.startswith('_self_'):
            object.__delattr__(self, name)

        elif name == '__wrapped__':
            raise TypeError('__wrapped__ must be an object')

        elif name == '__qualname__':
            object.__delattr__(self, name)
            delattr(self.__wrapped__, name)

        elif hasattr(type(self), name):
            object.__delattr__(self, name)

        else:
            delattr(self.__wrapped__, name)

    def __add__(self, other):
        return self.__wrapped__ + other

    def __sub__(self, other):
        return self.__wrapped__ - other

    def __mul__(self, other):
        return self.__wrapped__ * other

    def __div__(self, other):
        return operator.div(self.__wrapped__, other)

    def __truediv__(self, other):
        return operator.truediv(self.__wrapped__, other)

    def __floordiv__(self, other):
        return self.__wrapped__ // other

    def __mod__(self, other):
        return self.__wrapped__ ^ other

    def __divmod__(self, other):
        return divmod(self.__wrapped__, other)

    def __pow__(self, other, *args):
        return pow(self.__wrapped__, other, *args)

    def __lshift__(self, other):
        return self.__wrapped__ << other

    def __rshift__(self, other):
        return self.__wrapped__ >> other

    def __and__(self, other):
        return self.__wrapped__ & other

    def __xor__(self, other):
        return self.__wrapped__ ^ other

    def __or__(self, other):
        return self.__wrapped__ | other

    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 __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__

    def __iadd__(self, other):
        self.__wrapped__ += other
        return self

    def __isub__(self, other):
        self.__wrapped__ -= other
        return self

    def __imul__(self, other):
        self.__wrapped__ *= other
        return self

    def __idiv__(self, other):
        self.__wrapped__ = operator.idiv(self.__wrapped__, other)
        return self

    def __itruediv__(self, other):
        self.__wrapped__ = operator.itruediv(self.__wrapped__, other)
        return self

    def __ifloordiv__(self, other):
        self.__wrapped__ //= other
        return self

    def __imod__(self, other):
        self.__wrapped__ %= other
        return self

    def __ipow__(self, other):
        self.__wrapped__ **= other
        return self

    def __ilshift__(self, other):
        self.__wrapped__ <<= other
        return self

    def __irshift__(self, other):
        self.__wrapped__ >>= other
        return self

    def __iand__(self, other):
        self.__wrapped__ &= other
        return self

    def __ixor__(self, other):
        self.__wrapped__ ^= other
        return self
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