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issequence_containinginorder.py
__author__ = "Jon Reid" __copyright__ = "Copyright 2011 hamcrest.org" __license__ = "BSD, see License.txt" from hamcrest.core.base_matcher import BaseMatcher from hamcrest.core.helpers.hasmethod import hasmethod from hamcrest.core.helpers.wrap_matcher import wrap_matcher class MatchingInOrder(object): def __init__(self, matchers, mismatch_description): self.matchers = matchers self.mismatch_description = mismatch_description self.next_match_index = 0 def matches(self, item): return self.isnotsurplus(item) and self.ismatched(item) def isfinished(self): if self.next_match_index < len(self.matchers): if self.mismatch_description: self.mismatch_description.append_text('No item matched: ') \ .append_description_of(self.matchers[self.next_match_index]) return False return True def ismatched(self, item): matcher = self.matchers[self.next_match_index] if not matcher.matches(item): if self.mismatch_description: self.mismatch_description.append_text('item ' + str(self.next_match_index) + ': ') matcher.describe_mismatch(item, self.mismatch_description) return False self.next_match_index += 1 return True def isnotsurplus(self, item): if len(self.matchers) <= self.next_match_index: if self.mismatch_description: self.mismatch_description.append_text('Not matched: ') \ .append_description_of(item) return False return True class IsSequenceContainingInOrder(BaseMatcher): def __init__(self, matchers): self.matchers = matchers def matches(self, sequence, mismatch_description=None): try: matchsequence = MatchingInOrder(self.matchers, mismatch_description) for item in sequence: if not matchsequence.matches(item): return False return matchsequence.isfinished() except TypeError: if mismatch_description: super(IsSequenceContainingInOrder, self) \ .describe_mismatch(sequence, mismatch_description) return False def describe_mismatch(self, item, mismatch_description): self.matches(item, mismatch_description) def describe_to(self, description): description.append_text('a sequence containing ') \ .append_list('[', ', ', ']', self.matchers) def contains(*items): """Matches if sequence's elements satisfy a given list of matchers, in order. :param match1,...: A comma-separated list of matchers. This matcher iterates the evaluated sequence and a given list of matchers, seeing if each element satisfies its corresponding matcher. Any argument that is not a matcher is implicitly wrapped in an :py:func:`~hamcrest.core.core.isequal.equal_to` matcher to check for equality. """ matchers = [] for item in items: matchers.append(wrap_matcher(item)) return IsSequenceContainingInOrder(matchers)
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