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"""
Commonly used hooks for on_setattr.
"""

from __future__ import absolute_import, division, print_function

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:
        return c(new_value)

return new_value

NO_OP = object()
"""
Sentinel for disabling class-wide *on_setattr* hooks for certain attributes.

Does not work in `pipe` or within lists.

.. versionadded:: 20.1.0
"""

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