ValidatedQuantity.fromString constructor

ValidatedQuantity.fromString(String string)

Implementation

factory ValidatedQuantity.fromString(String string) {
  final RegExpMatch? matches = valueRegex.firstMatch(string);
  if (matches?.namedGroup('value') == null) {
    throw Exception('Quantity must have a number, but was passed $string');
  }
  string = string.replaceAll(matches!.namedGroup('value')!, '').trim();
  if (string.startsWith("'")) {
    string = string.substring(1);
  }
  if (string.endsWith("'")) {
    string = string.substring(0, string.length - 1);
  }
  return ValidatedQuantity(
      value: UcumDecimal.fromString(matches.namedGroup('value')),
      unit: string.isEmpty ? '1' : string);
}