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52 lines
1.1 KiB
Python
52 lines
1.1 KiB
Python
"""
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Commonly useful filters for :func:`attr.asdict`.
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"""
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from __future__ import absolute_import, division, print_function
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from ._compat import isclass
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from ._make import Attribute
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def _split_what(what):
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"""
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Returns a tuple of `frozenset`s of classes and attributes.
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"""
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return (
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frozenset(cls for cls in what if isclass(cls)),
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frozenset(cls for cls in what if isinstance(cls, Attribute)),
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)
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def include(*what):
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"""
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Whitelist *what*.
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:param what: What to whitelist.
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:type what: :class:`list` of :class:`type` or :class:`attr.Attribute`\\ s
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:rtype: :class:`callable`
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"""
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cls, attrs = _split_what(what)
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def include_(attribute, value):
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return value.__class__ in cls or attribute in attrs
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return include_
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def exclude(*what):
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"""
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Blacklist *what*.
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:param what: What to blacklist.
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:type what: :class:`list` of classes or :class:`attr.Attribute`\\ s.
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:rtype: :class:`callable`
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"""
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cls, attrs = _split_what(what)
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def exclude_(attribute, value):
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return value.__class__ not in cls and attribute not in attrs
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return exclude_
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