36 lines
1.0 KiB
Python
36 lines
1.0 KiB
Python
##############################################################################
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#
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# Copyright (c) 2002 Zope Foundation and Contributors.
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# All Rights Reserved.
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#
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# This software is subject to the provisions of the Zope Public License,
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# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
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# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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# FOR A PARTICULAR PURPOSE.
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#
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##############################################################################
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"""Adapter-style interface registry
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See Adapter class.
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"""
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from zope.interface import Declaration
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def _flatten(implements, include_None=0):
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try:
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r = implements.flattened()
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except AttributeError:
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if implements is None:
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r=()
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else:
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r = Declaration(implements).flattened()
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if not include_None:
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return r
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r = list(r)
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r.append(None)
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return r
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