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packages/petitparser/test/debug_test.dart

+library petitparser.test.debug_test;
+
+import 'package:test/test.dart';
+
+import 'package:petitparser/petitparser.dart';
+import 'package:petitparser/debug.dart';
+
+final identifier = letter() & word().star();
+
+main() {
+  group('continuation', () {
+    test('delegation', () {
+      var parser = new ContinuationParser(digit(), (continuation, context) {
+        return continuation(context);
+      });
+      expect(parser.parse('1').isSuccess, isTrue);
+      expect(parser.parse('a').isSuccess, isFalse);
+    });
+    test('divertion', () {
+      var parser = new ContinuationParser(digit(), (continuation, context) {
+        return letter().parseOn(context);
+      });
+      expect(parser.parse('1').isSuccess, isFalse);
+      expect(parser.parse('a').isSuccess, isTrue);
+    });
+    test('resume', () {
+      var capture = new List();
+      var parser = new ContinuationParser(digit(), (continuation, Context context) {
+        capture.add([continuation, context]);
+        // we have to return something for now
+        return context.failure('Abort');
+      });
+      // execute the parser twice to collect the continuations
+      expect(parser.parse('1').isSuccess, isFalse);
+      expect(parser.parse('a').isSuccess, isFalse);
+      // later we can execute the captured continuations
+      expect(capture[0][0](capture[0][1]).isSuccess, isTrue);
+      expect(capture[1][0](capture[1][1]).isSuccess, isFalse);
+      // of course the continuations can be resumed multiple times
+      expect(capture[0][0](capture[0][1]).isSuccess, isTrue);
+      expect(capture[1][0](capture[1][1]).isSuccess, isFalse);
+    });
+    test('success', () {
+      var parser = new ContinuationParser(digit(), (continuation, Context context) {
+        return context.success('Always succeed');
+      });
+      expect(parser.parse('1').isSuccess, isTrue);
+      expect(parser.parse('a').isSuccess, isTrue);
+    });
+    test('failure', () {
+      var parser = new ContinuationParser(digit(), (continuation, Context context) {
+        return context.failure('Always fail');
+      });
+      expect(parser.parse('1').isSuccess, isFalse);
+      expect(parser.parse('a').isSuccess, isFalse);
+    });
+    test('copy', () {
+      var parser = new ContinuationParser(digit(), (continuation, context) {
+        return continuation(context);
+      });
+      var copy = parser.copy();
+      expect(copy.parse('1').isSuccess, isTrue);
+      expect(copy.parse('a').isSuccess, isFalse);
+    });
+  });
+  group('trace', () {
+    test('success', () {
+      var lines = new List();
+      expect(trace(identifier, (line) => lines.add(line)).parse('a').isSuccess, isTrue);
+      expect(lines, [
+        'Instance of \'SequenceParser\'',
+        '  Instance of \'CharacterParser\'[letter expected]',
+        '  Success[1:2]: a',
+        '  Instance of \'PossessiveRepeatingParser\'[0..*]',
+        '    Instance of \'CharacterParser\'[letter or digit expected]',
+        '    Failure[1:2]: letter or digit expected',
+        '  Success[1:2]: []',
+        'Success[1:2]: [a, []]'
+      ]);
+    });
+    test('failure', () {
+      var lines = new List();
+      expect(trace(identifier, (line) => lines.add(line)).parse('1').isFailure, isTrue);
+      expect(lines, [
+        'Instance of \'SequenceParser\'',
+        '  Instance of \'CharacterParser\'[letter expected]',
+        '  Failure[1:1]: letter expected',
+        'Failure[1:1]: letter expected'
+      ]);
+    });
+  });
+  group('profile', () {
+    test('success', () {
+      var lines = new List();
+      expect(profile(identifier, (line) => lines.add(line))
+          .parse('ab123').isSuccess, isTrue);
+      lines = lines
+          .map((row) => row.split('\t'))
+          .map((row) => [int.parse(row[0]), int.parse(row[1]), row[2]]);
+      expect(lines, hasLength(4));
+      expect(lines.every((row) => row[1] >= 0), isTrue);
+      expect(lines.firstWhere((row) => row[2].indexOf('SequenceParser') > 0)[0], 1);
+      expect(lines.firstWhere((row) => row[2].indexOf('letter expected') > 0)[0], 1);
+      expect(lines.firstWhere((row) => row[2].indexOf('PossessiveRepeatingParser') > 0)[0], 1);
+      expect(lines.firstWhere((row) => row[2].indexOf('letter or digit expected') > 0)[0], 5);
+    });
+    test('failure', () {
+      var lines = new List();
+      expect(profile(identifier, (line) => lines.add(line)).parse('1').isFailure, isTrue);
+      lines = lines
+          .map((row) => row.split('\t'))
+          .map((row) => [int.parse(row[0]), int.parse(row[1]), row[2]]);
+      expect(lines, hasLength(4));
+      expect(lines.every((row) => row[1] >= 0), isTrue);
+      expect(lines.firstWhere((row) => row[2].indexOf('SequenceParser') > 0)[0], 1);
+      expect(lines.firstWhere((row) => row[2].indexOf('letter expected') > 0)[0], 1);
+      expect(lines.firstWhere((row) => row[2].indexOf('PossessiveRepeatingParser') > 0)[0], 0);
+      expect(lines.firstWhere((row) => row[2].indexOf('letter or digit expected') > 0)[0], 0);
+    });
+  });
+  group('progress', () {
+    test('success', () {
+      var lines = new List();
+      expect(progress(identifier, (line) => lines.add(line))
+          .parse('ab123').isSuccess, isTrue);
+      expect(lines, [
+        '* Instance of \'SequenceParser\'',
+        '* Instance of \'CharacterParser\'[letter expected]',
+        '** Instance of \'PossessiveRepeatingParser\'[0..*]',
+        '** Instance of \'CharacterParser\'[letter or digit expected]',
+        '*** Instance of \'CharacterParser\'[letter or digit expected]',
+        '**** Instance of \'CharacterParser\'[letter or digit expected]',
+        '***** Instance of \'CharacterParser\'[letter or digit expected]',
+        '****** Instance of \'CharacterParser\'[letter or digit expected]'
+      ]);
+    });
+    test('failure', () {
+      var lines = new List();
+      expect(progress(identifier, (line) => lines.add(line)).parse('1').isFailure, isTrue);
+      expect(lines, [
+        '* Instance of \'SequenceParser\'',
+        '* Instance of \'CharacterParser\'[letter expected]'
+      ]);
+    });
+  });
+}