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