_Mismatch? _compareIterables()

in lib/src/equals_matcher.dart [105:135]

• 24 lines of code
• 8 McCabe index (conditional complexity)

  _Mismatch? _compareIterables(Iterable expected, Object? actual,
      _RecursiveMatcher matcher, int depth, String location) {
    if (actual is Iterable) {
      var expectedIterator = expected.iterator;
      var actualIterator = actual.iterator;
      for (var index = 0;; index++) {
        // Advance in lockstep.
        var expectedNext = expectedIterator.moveNext();
        var actualNext = actualIterator.moveNext();

        // If we reached the end of both, we succeeded.
        if (!expectedNext && !actualNext) return null;

        // Fail if their lengths are different.
        var newLocation = '$location[$index]';
        if (!expectedNext) {
          return _Mismatch.simple(newLocation, actual, 'longer than expected');
        }
        if (!actualNext) {
          return _Mismatch.simple(newLocation, actual, 'shorter than expected');
        }

        // Match the elements.
        var rp = matcher(expectedIterator.current, actualIterator.current,
            newLocation, depth);
        if (rp != null) return rp;
      }
    } else {
      return _Mismatch.simple(location, actual, 'is not Iterable');
    }
  }