getSelectedText method

Implementation

String getSelectedText() {
  if (selectionStart == null || selectionEnd == null) return '';

  final (x1, y1) = selectionStart!;
  final (x2, y2) = selectionEnd!;

  final startY = math.min(y1, y2);
  final endY = math.max(y1, y2);

  if (startY < 0 || endY >= lines.length) return '';

  final sb = StringBuffer();
  for (var y = startY; y <= endY; y++) {
    final line = lines[y];
    final plain = Style.stripAnsi(line);

    int startX, endX;
    if (startY == endY) {
      startX = math.min(x1, x2);
      endX = math.max(x1, x2);
    } else if (y == startY) {
      startX = y1 < y2 ? x1 : x2;
      endX = Style.visibleLength(plain);
    } else if (y == endY) {
      startX = 0;
      endX = y1 < y2 ? x2 : x1;
    } else {
      startX = 0;
      endX = Style.visibleLength(plain);
    }

    final maxX = Style.visibleLength(plain);
    startX = startX.clamp(0, maxX);
    endX = endX.clamp(0, maxX);

    if (startX < endX) {
      sb.write(ranges.cutAnsiByCells(plain, startX, endX));
    }
    if (y < endY) {
      sb.write('\n');
    }
  }

  return sb.toString();
}