int _indexOf()

in lib/src/characters_impl.dart [1041:1064]

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

int _indexOf(String source, String pattern, int start, int end) {
  var patternLength = pattern.length;
  if (patternLength == 0) return start;
  // Any start position after realEnd won't fit the pattern before end.
  var realEnd = end - patternLength;
  if (realEnd < start) return -1;
  // Use indexOf if what we can overshoot is
  // less than twice as much as what we have left to search.
  var rest = source.length - realEnd;
  if (rest <= (realEnd - start) * 2) {
    var index = 0;
    while (start < realEnd && (index = source.indexOf(pattern, start)) >= 0) {
      if (index > realEnd) return -1;
      if (isGraphemeClusterBoundary(source, start, end, index) &&
          isGraphemeClusterBoundary(
              source, start, end, index + patternLength)) {
        return index;
      }
      start = index + 1;
    }
    return -1;
  }
  return _gcIndexOf(source, pattern, start, end);
}