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"""Base class for Namespace proxies in class creation.""" |
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import weakref |
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from . import ops |
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from .proxy import _Proxy |
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_PROXY_INFOS = weakref.WeakKeyDictionary() |
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class _ScopeProxy(_Proxy): |
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"""Proxy object for manipulating namespaces during class creation.""" |
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__slots__ = '__weakref__', |
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def __init__(self, dct, container): |
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_PROXY_INFOS[self] = container |
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container[self] = dct |
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def __dir__(self): |
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# This line will fire if dir(ns) is done during class creation. |
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return _PROXY_INFOS[self][self] |
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def __getattribute__(self, name): |
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dct = _PROXY_INFOS[self][self] |
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try: |
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return dct[name] |
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# These lines will fire if a non-existent namespace attribute is gotten |
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# during class creation. |
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except KeyError: |
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raise AttributeError(name) |
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def __setattr__(self, name, value): |
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_PROXY_INFOS[self][self][name] = value |
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def __delattr__(self, name): |
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ops.delete(_PROXY_INFOS[self][self], name) |
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def __enter__(self): |
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return _PROXY_INFOS[self][self].__enter__() |
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def __exit__(self, exc_type, exc_value, traceback): |
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return _PROXY_INFOS[self][self].__exit__( |
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exc_type, exc_value, traceback) |
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mwchase /
class-namespaces
