66 lines
2 KiB
Dart
66 lines
2 KiB
Dart
import 'package:belatuk_combinator/belatuk_combinator.dart';
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import 'package:matcher/matcher.dart';
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import 'package:test/test.dart';
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import 'common.dart';
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void main() {
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test('advance', () {
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var scanner = scan('hello world');
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// Casted -> dynamic just for the sake of coverage.
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var parser = match('he').forward(2).castDynamic();
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parser.parse(scanner);
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expect(scanner.position, 4);
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});
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test('change', () {
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var parser = match('hello').change((r) => r.change(value: 23));
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expect(parser.parse(scan('helloworld')).value, 23);
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});
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test('check', () {
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var parser = match<int>(RegExp(r'[A-Za-z]+'))
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.value((r) => r.span!.length)
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.check(greaterThan(3));
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expect(parser.parse(scan('helloworld')).successful, isTrue);
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expect(parser.parse(scan('yo')).successful, isFalse);
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});
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test('map', () {
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var parser = match(RegExp(r'[A-Za-z]+')).map<int>((r) => r.span!.length);
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expect(parser.parse(scan('hello')).value, 5);
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});
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test('negate', () {
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var parser = match('hello').negate(errorMessage: 'world');
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expect(parser.parse(scan('goodbye world')).successful, isTrue);
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expect(parser.parse(scan('hello world')).successful, isFalse);
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expect(parser.parse(scan('hello world')).errors.first.message, 'world');
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});
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group('opt', () {
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var single = match('hello').opt(backtrack: true);
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var list = match('hel').then(match('lo')).opt();
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test('succeeds if present', () {
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expect(single.parse(scan('hello')).successful, isTrue);
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expect(list.parse(scan('hello')).successful, isTrue);
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});
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test('succeeds if not present', () {
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expect(single.parse(scan('goodbye')).successful, isTrue);
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expect(list.parse(scan('goodbye')).successful, isTrue);
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});
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test('backtracks if not present', () {
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for (var parser in [single, list]) {
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var scanner = scan('goodbye');
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var pos = scanner.position;
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parser.parse(scanner);
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expect(scanner.position, pos);
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}
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});
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});
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test('safe', () {});
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}
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