CharacterRange? replaceFirst()

in lib/src/characters_impl.dart [821:838]

• 18 lines of code
• 3 McCabe index (conditional complexity)

  CharacterRange? replaceFirst(Characters pattern, Characters replacement) {
    var patternString = pattern.string;
    var replacementString = replacement.string;
    String replaced;
    if (patternString.isEmpty) {
      replaced = _string.replaceRange(_start, _start, replacementString);
    } else {
      var index = _indexOf(_string, patternString, _start, _end);
      if (index >= 0) {
        replaced = _string.replaceRange(
            index, index + patternString.length, replacementString);
      } else {
        return null;
      }
    }
    var newEnd = replaced.length - _string.length + _end;
    return _expandRange(replaced, _start, newEnd);
  }