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from __future__ import absolute_import
__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"
from hamcrest.core.base_matcher import BaseMatcher, Matcher
from hamcrest.core.helpers.wrap_matcher import wrap_matcher, is_matchable_type
from .isequal import equal_to
from .isinstanceof import instance_of
class IsNot(BaseMatcher):
def __init__(self, matcher):
self.matcher = matcher
def _matches(self, item):
return not self.matcher.matches(item)
def describe_to(self, description):
description.append_text('not ').append_description_of(self.matcher)
def wrap_value_or_type(x):
if is_matchable_type(x):
return instance_of(x)
else:
return wrap_matcher(x)
def is_not(match):
"""Inverts the given matcher to its logical negation.
:param match: The matcher to negate.
This matcher compares the evaluated object to the negation of the given
matcher. If the ``match`` argument is not a matcher, it is implicitly
wrapped in an :py:func:`~hamcrest.core.core.isequal.equal_to` matcher to
check for equality, and thus matches for inequality.
Examples::
assert_that(cheese, is_not(equal_to(smelly)))
assert_that(cheese, is_not(smelly))
"""
return IsNot(wrap_value_or_type(match))
def not_(match):
"""Alias of :py:func:`is_not` for better readability of negations.
Examples::
assert_that(alist, not_(has_item(item)))
"""
return is_not(match)
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