moveWordLeft function

NavigationResult moveWordLeft(Root root, CaretStop current, { List<CaretStop>? stops, List<LogicalLine>? cachedLines, })

Implementation

NavigationResult moveWordLeft(Root root, CaretStop current, {
  List<CaretStop>? stops,
  List<LogicalLine>? cachedLines,
}) {
  final stops_ = stops ?? buildAllStops(root);
  int idx = findStopIndex(stops_, current.fragmentId, current.offset);
  if (idx < 0 || idx <= 0) return NavigationResult.none;

  _ensureWordCaches(root, stops_, cachedLines: cachedLines);
  final cache = _wordFragCache!;
  final lineIdx = _wordLineIdx!;
  String? ch(int i) => _charLeft(stops_, i, cache, lineIdx);

  final startChar = ch(idx);

  if (startChar == null) return NavigationResult.none;

  if (_isSpaceChar(startChar)) {
    while (idx > 0 && _isSpaceChar(ch(idx) ?? '')) {
      idx--;
    }
    while (idx > 0) {
      final c = ch(idx);
      if (c == null || !_isWordChar(c)) break;
      idx--;
    }
  } else if (_isWordChar(startChar)) {
    while (idx > 0) {
      final c = ch(idx);
      if (c == null || !_isWordChar(c)) break;
      idx--;
    }
  } else {
    while (idx > 0) {
      final c = ch(idx);
      if (c == null || _isWordChar(c) || _isSpaceChar(c)) break;
      idx--;
    }
  }

  return NavigationResult(position: stops_[idx], preferredX: 0.0);
}