public void ValidExpressionContainsNoUnrecognizedTokens()
{
TheLexer lexer = new TheLexer();
var tokens = lexer.GetTokens("3 + 5");
Assert.AreEqual(0, tokens.Count(p => p.GetType() == typeof(UnrecognizedToken)));
}
public void UnrecognizedTokenDetected()
{
TheLexer lexer = new TheLexer();
var tokens = lexer.GetTokens("3 xyz 5");
Assert.AreEqual(1, tokens.Count(p => p.GetType() == typeof(UnrecognizedToken)));
}
public ParserState(string input)
{
var inputStream = new AntlrInputStream(input);
lexer = new TheLexer(inputStream);
var commonTokenStream = new CommonTokenStream(lexer);
parser = new TheParser(commonTokenStream);
errorListener = new ErrorListener(commonTokenStream);
lexer.RemoveErrorListeners();
parser.RemoveErrorListeners();
parser.AddErrorListener(errorListener);
}
/// <summary>
/// Will convert the input to a Regular Expression String, but will not enclose it with reuired options. Used for testing purposes.
/// </summary>
/// <param name="input">A string in Impression format.</param>
public static string ConvertNoOptions(string input)
{
var inputStream = new AntlrInputStream(input);
var lexer = new TheLexer(inputStream);
var commonTokenStream = new CommonTokenStream(lexer);
var parser = new TheParser(commonTokenStream);
var errorListener = new ErrorListener(commonTokenStream);
lexer.RemoveErrorListeners();
parser.RemoveErrorListeners();
parser.AddErrorListener(errorListener);
var context = parser.expressionSeq();
var visitor = new Visitor(errorListener);
var result = visitor.Visit(context);
if (visitor.errorListener.hadErrors)
{
throw new InvalidOperationException(visitor.errorListener.PrintErrors());
}
return(result);
}
