public void DfaLexemeShouldMatchOneOrMoreRandomWhitespaceCharacters() { var randomWhitespace = "\t\f\v \r\n"; var dfa = new DfaState(); var final = new DfaState(true); dfa.AddTransition(new DfaTransition(new WhitespaceTerminal(), final)); final.AddTransition(new DfaTransition(new WhitespaceTerminal(), final)); var dfaLexerRule = new DfaLexerRule(dfa, new TokenType("whitespace")); var whitespaceLexeme = new DfaLexeme(dfaLexerRule); for (int i = 0; i < randomWhitespace.Length; i++) Assert.IsTrue(whitespaceLexeme.Scan(randomWhitespace[i])); }
public void DfaLexemeGivenCharacerLexemeNumberShouldFail() { var numberInput = "0"; var dfa = new DfaState(); var final = new DfaState(true); dfa.AddTransition(new DfaTransition(new RangeTerminal('a', 'z'), final)); final.AddTransition(new DfaTransition(new RangeTerminal('a', 'z'), final)); var dfaLexerRule = new DfaLexerRule(dfa, new TokenType("lowerCase")); var letterLexeme = new DfaLexeme(dfaLexerRule); Assert.IsFalse(letterLexeme.Scan(numberInput[0])); Assert.AreEqual(string.Empty, letterLexeme.Capture); }
public void DfaLexemeShouldMatchMixedCaseWord() { var wordInput = "t90vAriabl3"; var dfa = new DfaState(); var final = new DfaState(true); dfa.AddTransition(new DfaTransition(new RangeTerminal('a', 'z'), final)); dfa.AddTransition(new DfaTransition(new RangeTerminal('A', 'Z'), final)); final.AddTransition(new DfaTransition(new RangeTerminal('a', 'z'), final)); final.AddTransition(new DfaTransition(new RangeTerminal('A', 'Z'), final)); final.AddTransition(new DfaTransition(new DigitTerminal(), final)); var dfaLexerRule = new DfaLexerRule(dfa, new TokenType("Identifier")); var indentifierLexeme = new DfaLexeme(dfaLexerRule); for (int i = 0; i < wordInput.Length; i++) Assert.IsTrue(indentifierLexeme.Scan(wordInput[i])); }
public ILexeme Create(ILexerRule lexerRule, int position) { if (lexerRule.LexerRuleType != LexerRuleType) { throw new Exception( $"Unable to create DfaLexeme from type {lexerRule.GetType().FullName}. Expected DfaLexerRule"); } var dfaLexerRule = lexerRule as IDfaLexerRule; if (_queue.Count > 0) { var reusedLexeme = _queue.Dequeue(); reusedLexeme.Reset(dfaLexerRule, position); return(reusedLexeme); } var dfaLexeme = new DfaLexeme(dfaLexerRule, position); return(dfaLexeme); }