extract method

@override List extract(dynamic input)

Process input and extract necessary data.

• Note: the output is usually passed to the next extractor in the chain.

Implementation

@override
List extract(input) {
  final inputSource = prepareInputSource(input);
  if (inputSource == null) return [];
  return [options[inputSource] ?? defaultValue].where((element) => element != null).toList();
}