Current File : //lib/python3/dist-packages/hamcrest/library/object/haslength.py
from collections.abc import Sized
from typing import Union
from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.description import Description
from hamcrest.core.helpers.hasmethod import hasmethod
from hamcrest.core.helpers.wrap_matcher import wrap_matcher
from hamcrest.core.matcher import Matcher
__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"
class HasLength(BaseMatcher[Sized]):
def __init__(self, len_matcher: Matcher[int]) -> None:
self.len_matcher = len_matcher
def _matches(self, item: Sized) -> bool:
if not hasmethod(item, "__len__"):
return False
return self.len_matcher.matches(len(item))
def describe_mismatch(self, item: Sized, mismatch_description: Description) -> None:
super(HasLength, self).describe_mismatch(item, mismatch_description)
if hasmethod(item, "__len__"):
mismatch_description.append_text(" with length of ").append_description_of(len(item))
def describe_to(self, description: Description) -> None:
description.append_text("an object with length of ").append_description_of(self.len_matcher)
def has_length(match: Union[int, Matcher[int]]) -> Matcher[Sized]:
"""Matches if ``len(item)`` satisfies a given matcher.
:param match: The matcher to satisfy, or an expected value for
:py:func:`~hamcrest.core.core.isequal.equal_to` matching.
This matcher invokes the :py:func:`len` function on the evaluated object to
get its length, passing the result to a given matcher for evaluation.
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.
Examples::
has_length(greater_than(6))
has_length(5)
"""
return HasLength(wrap_matcher(match))
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