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);
}