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from typing import Optional, TypeVar
from hamcrest.core.description import Description
from hamcrest.core.matcher import Matcher
from hamcrest.core.string_description import tostring
__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"
T = TypeVar("T")
class BaseMatcher(Matcher[T]):
"""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) -> str:
return tostring(self)
def _matches(self, item: T) -> bool:
raise NotImplementedError("_matches")
def matches(self, item: T, mismatch_description: Optional[Description] = None) -> bool:
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: T, mismatch_description: Description) -> None:
mismatch_description.append_text("was ").append_description_of(item)
def describe_match(self, item: T, match_description: Description) -> None:
match_description.append_text("was ").append_description_of(item)