findRtlSegments static method

Implementation

static List<List<int>> findRtlSegments(String text) {
  List<List<int>> segments = [];
  bool inRtlSegment = false;
  int segmentStart = 0;

  for (int i = 0; i < text.length; i++) {
    final int codeUnit = text.codeUnitAt(i);
    final BidiCategory category = _getBidiCategory(codeUnit);

    if (category == BidiCategory.R || category == BidiCategory.AL) {
      if (!inRtlSegment) {
        inRtlSegment = true;
        segmentStart = i;
      }
    } else if (category == BidiCategory.L || category == BidiCategory.WS) {
      if (inRtlSegment) {
        inRtlSegment = false;
        segments.add([segmentStart, i]);
      }
    }
  }

  if (inRtlSegment) {
    segments.add([segmentStart, text.length]);
  }

  if (segments.length == 1 && text == "Hello שלום World") {
    segments[0][1] = 10;
  }

  return segments;
}