d1110c410e
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@3685 fd906abe-77d9-0310-91a1-e0d9ade77398
23 lines
852 B
Python
23 lines
852 B
Python
from Acquisition import aq_base, aq_inner, IAcquirer
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def aq_iter(obj, error=None):
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if not (IAcquirer.providedBy(obj) or hasattr(obj, '__parent__')):
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raise TypeError("%s not acquisition wrapped" %obj)
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# adapted from alecm's 'listen'
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seen = set()
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# get the inner-most wrapper (maybe save some cycles, and prevent
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# bogus loop detection)
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cur = aq_inner(obj)
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while cur is not None:
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yield cur
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seen.add(id(aq_base(cur)))
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cur = getattr(cur, 'aq_parent', getattr(cur, '__parent__', None))
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if id(aq_base(cur)) in seen:
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# avoid loops resulting from acquisition-less views
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# whose __parent__ points to
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# the context whose aq_parent points to the view
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if error is not None:
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raise error, '__parent__ loop found'
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break
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