parse method

@override String? parse(String? value)

Implementation

@override
String? parse(String? value) {
  if (value == null || value.isEmpty) {
    return null;
  }

  List<String> parts = value.split('.');

  if (parts.length != 4) {
    return null;
  }

  for (final String part in parts) {
    int? octet = int.tryParse(part);
    if (octet == null || octet < 0 || octet > 255) {
      return null;
    }
  }

  return value;
}