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Commonly useful validators.
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    A validator that raises a :exc:`TypeError` if the initializer is called
    with a wrong type for this particular attribute (checks are performed using
    :func:`isinstance` therefore it's also valid to pass a tuple of types).

    :param type: The type to check for.
    :type type: type or tuple of types

    :raises TypeError: With a human readable error message, the attribute
        (of type :class:`attr.Attribute`), the expected type, and the value it
        got.
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c@s"eZdZeZddZddZdS)_ProvidesValidatorcCs0|j|s,tdj|j|j|d||j|dS)rz<'{name}' must provide {interface!r} which {value!r} doesn't.)r	interfacerN)r)Z
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    A validator that raises a :exc:`TypeError` if the initializer is called
    with an object that does not provide the requested *interface* (checks are
    performed using ``interface.providedBy(value)`` (see `zope.interface
    <https://zopeinterface.readthedocs.io/en/latest/>`_).

    :param zope.interface.Interface interface: The interface to check for.

    :raises TypeError: With a human readable error message, the attribute
        (of type :class:`attr.Attribute`), the expected interface, and the
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c@s"eZdZeZddZddZdS)_OptionalValidatorcCs|dkrdS||||dS)N	validatorrrrr r!fsz_OptionalValidator.__call__cCsdjt|jdS)Nz'<optional validator for {what} or None>)Zwhat)rrr-r#rrr r$lsz_OptionalValidator.__repr__N)r%r&r'rr-r!r$rrrr r+bsr+cCst|trtt|St|S)a
    A validator that makes an attribute optional.  An optional attribute is one
    which can be set to ``None`` in addition to satisfying the requirements of
    the sub-validator.

    :param validator: A validator (or a list of validators) that is used for
        non-``None`` values.
    :type validator: callable or :class:`list` of callables.

    .. versionadded:: 15.1.0
    .. versionchanged:: 17.1.0 *validator* can be a list of validators.
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c@s"eZdZeZddZddZdS)_InValidatorcCs&||jkr"tdj|j|j|ddS)Nz/'{name}' must be in {options!r} (got {value!r}))roptionsr)r0
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    A validator that raises a :exc:`ValueError` if the initializer is called
    with a value that does not belong in the options provided.  The check is
    performed using ``value in options``.

    :param options: Allowed options.
    :type options: list, tuple, :class:`enum.Enum`, ...

    :raises ValueError: With a human readable error message, the attribute (of
       type :class:`attr.Attribute`), the expected options, and the value it
       got.

    .. versionadded:: 17.1.0
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