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# SPDX-License-Identifier: MIT """ Commonly used hooks for on_setattr. """ from . import _config from .exceptions import FrozenAttributeError def pipe(*setters): """ Run all *setters* and return the return value of the last one. .. versionadded:: 20.1.0 """ def wrapped_pipe(instance, attrib, new_value): rv = new_value for setter in setters: rv = setter(instance, attrib, rv) return rv return wrapped_pipe def frozen(_, __, ___): """ Prevent an attribute to be modified. .. versionadded:: 20.1.0 """ raise FrozenAttributeError() def validate(instance, attrib, new_value): """ Run *attrib*'s validator on *new_value* if it has one. .. versionadded:: 20.1.0 """ if _config._run_validators is False: return new_value v = attrib.validator if not v: return new_value v(instance, attrib, new_value) return new_value def convert(instance, attrib, new_value): """ Run *attrib*'s converter -- if it has one -- on *new_value* and return the result. .. versionadded:: 20.1.0 """ c = attrib.converter if c: # This can be removed once we drop 3.8 and use attrs.Converter instead. from ._make import Converter if not isinstance(c, Converter): return c(new_value) return c(new_value, instance, attrib) return new_value # Sentinel for disabling class-wide *on_setattr* hooks for certain attributes. # Sphinx's autodata stopped working, so the docstring is inlined in the API # docs. NO_OP = object()
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