int _lastIndexOf()

in lib/src/characters_impl.dart [1083:1106]

• 21 lines of code
• 9 McCabe index (conditional complexity)

int _lastIndexOf(String source, String pattern, int start, int end) {
  var patternLength = pattern.length;
  if (patternLength == 0) return end;
  // Start of pattern must be in range [start .. end - patternLength].
  var realEnd = end - patternLength;
  if (realEnd < start) return -1;
  // If the range from 0 to start is no more than double the range from
  // start to end, use lastIndexOf.
  if (realEnd * 2 > start) {
    var index = 0;
    while (realEnd >= start &&
        (index = source.lastIndexOf(pattern, realEnd)) >= 0) {
      if (index < start) return -1;
      if (isGraphemeClusterBoundary(source, start, end, index) &&
          isGraphemeClusterBoundary(
              source, start, end, index + patternLength)) {
        return index;
      }
      realEnd = index - 1;
    }
    return -1;
  }
  return _gcLastIndexOf(source, pattern, start, end);
}