import 'package:belatuk_combinator/belatuk_combinator.dart'; import 'package:test/test.dart'; import 'common.dart'; void main() { var number = chain([ match(RegExp(r'[0-9]+')).value((r) => int.parse(r.span!.text)), match(',').opt(), ]).first().cast(); var numbers = number.plus(); test('sort', () { var parser = numbers.sort((a, b) => a.compareTo(b)); expect(parser.parse(scan('21,2,3,34,20')).value, [2, 3, 20, 21, 34]); }); test('reduce', () { var parser = numbers.reduce((a, b) => a + b); expect(parser.parse(scan('21,2,3,34,20')).value, 80); expect(parser.parse(scan('not numbers')).value, isNull); }); }