public void TestCalculator()
{
var testString = @"a=1+2*3; print a;";
CalculatorLexer lexer = new CalculatorLexer(new AntlrInputStream(testString));
CommonTokenStream tokens = new CommonTokenStream(lexer);
CalculatorParser p = new CalculatorParser(tokens);
p.BuildParseTree = true;
p.AddParseListener(new CalculatorListener());
ParserRuleContext t = p.program();
}
static int Evaluate(string input)
{
var stream = new AntlrInputStream(input);
var lexer = new CalculatorLexer(stream);
var tokens = new CommonTokenStream(lexer);
var parser = new CalculatorParser(tokens);
var program = parser.program();
var visitor = new CalcGrammarVisitor();
var result = visitor.Visit(program);
return(result);
}
public object Execute(string script)
{
AntlrInputStream stream = new AntlrInputStream(script);
CalculatorLexer lexer = new CalculatorLexer(stream);
CommonTokenStream tokenStream = new CommonTokenStream(lexer);
CalculatorParser parser = new CalculatorParser(tokenStream);
var root = parser.program();
if (root.IsEmpty && root.exception != null)
{
if (root.exception is RecognitionException)
{
throw new Exception("null");
}
else
{
throw new InvalidOperationException();
}
}
object result = root.Accept(m_processor);
return(result);
}
