getSearchKeys static method

Implementation

static List<String> getSearchKeys({required final String text}) {
  final searchKeys = <String>[];

  var _text = text.length > 300 ? text.substring(0, 300) : text;
  final _texts = _text.split(' ');

  // split letters of text
  for (int i = 0; i < _text.length; i++) {
    final letter = _text.substring(0, i + 1);
    if (!searchKeys.contains(letter.toUpperCase())) {
      searchKeys.add(letter.toUpperCase());
    }
  }
  //

  // split letters of texts
  for (int i = 0; i < _texts.length; i++) {
    for (int j = 0; j < _texts[i].length; j++) {
      final letter = _texts[i].substring(0, j + 1);
      if (!searchKeys.contains(letter.toUpperCase())) {
        searchKeys.add(letter.toUpperCase());
      }
    }
  }
  //

  return searchKeys
      .where((element) =>
          element.trim() != '' &&
          element.trim() != ',' &&
          element.trim() != '.')
      .toList();
}