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# SPDX-License-Identifier: MIT
"""
Commonly useful filters for `attr.asdict`.
"""
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 isinstance(cls, type)),
frozenset(cls for cls in what if isinstance(cls, str)),
frozenset(cls for cls in what if isinstance(cls, Attribute)),
)
def include(*what):
"""
Include *what*.
:param what: What to include.
:type what: `list` of classes `type`, field names `str` or
`attrs.Attribute`\\ s
:rtype: `callable`
.. versionchanged:: 23.1.0 Accept strings with field names.
"""
cls, names, attrs = _split_what(what)
def include_(attribute, value):
return (
value.__class__ in cls
or attribute.name in names
or attribute in attrs
)
return include_
def exclude(*what):
"""
Exclude *what*.
:param what: What to exclude.
:type what: `list` of classes `type`, field names `str` or
`attrs.Attribute`\\ s.
:rtype: `callable`
.. versionchanged:: 23.3.0 Accept field name string as input argument
"""
cls, names, attrs = _split_what(what)
def exclude_(attribute, value):
return not (
value.__class__ in cls
or attribute.name in names
or attribute in attrs
)
return exclude_