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e062359 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | # SPDX-License-Identifier: MIT
"""
Commonly useful filters for `attrs.asdict` and `attrs.astuple`.
"""
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):
"""
Create a filter that only allows *what*.
Args:
what (list[type, str, attrs.Attribute]):
What to include. Can be a type, a name, or an attribute.
Returns:
Callable:
A callable that can be passed to `attrs.asdict`'s and
`attrs.astuple`'s *filter* argument.
.. 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):
"""
Create a filter that does **not** allow *what*.
Args:
what (list[type, str, attrs.Attribute]):
What to exclude. Can be a type, a name, or an attribute.
Returns:
Callable:
A callable that can be passed to `attrs.asdict`'s and
`attrs.astuple`'s *filter* argument.
.. 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_
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