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class BaseWrapper(object):
"Base class for interface wrappers built from mixin classes"
def __init__(self, obj):
self.__obj = obj
def __get__(self, obj, objcls=None):
if obj is None:
return self
return self.__class__(obj)
def __getattr__(self, name):
obj = self.__obj
if obj is None:
raise TypeError('Unbound wrapper %r' % self)
return getattr(obj, name)
def __repr__(self):
names = ', '.join(n for n in dir(self) if not n.startswith('_'))
msg = 'bound to %r' % self.__obj if self.__obj is not None else ''
return '<%s {%s} %s>' % (self.__class__.__name__, names, msg)
def iwrapper(mixin):
"Convert a mixin class into an interface wrapper object"
# could be implemented with single-inheritance only, but why bother?
cls = type(mixin.__name__ + 'Wrapper', (BaseWrapper, mixin), {})
return cls(None)
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