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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.matcher import Matcher
from hamcrest.core.string_description import tostring
class BaseMatcher(Matcher):
"""Base class for all :py:class:`~hamcrest.core.matcher.Matcher`
implementations.
Most implementations can just implement :py:obj:`_matches`, leaving the
handling of any mismatch description to the ``matches`` method. But if it
makes more sense to generate the mismatch description during the matching,
override :py:meth:`~hamcrest.core.matcher.Matcher.matches` instead.
"""
def __str__(self):
return tostring(self)
def _matches(self, item):
raise NotImplementedError('_matches')
def matches(self, item, mismatch_description=None):
match_result = self._matches(item)
if not match_result and mismatch_description:
self.describe_mismatch(item, mismatch_description)
return match_result
def describe_mismatch(self, item, mismatch_description):
mismatch_description.append_text('was ').append_description_of(item)
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