public static string Execute(string input)
{
var inputStream = CharStreams.fromstring(input);
var lexer = new calcLexer(inputStream);
var tokenStream = new CommonTokenStream(lexer);
var parser = new calcParser(tokenStream);
var inputTree = parser.input();
var(isSuccess, type, value) = new Visitor().Visit(inputTree);
if (isSuccess)
{
return($"{type}" + ":" + $"{value}");
}
else
{
return(ErrString.GetErrString((ErrID)value));
}
}
public static void Main(string[] args)
{
Syms.init("calc.tokens");
string gdata;
using (var r = new StreamReader("terminals.txt"))
{
gdata = r.ReadToEnd();
}
var tokenizer = new Tokenizer(gdata);
string idata = Console.ReadLine();
tokenizer.setInput(idata);
IList <IToken> tokens = new List <IToken>();
while (true)
{
Token t = tokenizer.next();
if (t.Symbol == "$")
{
break; //at end
}
//CommonToken is defined in the ANTLR runtime
CommonToken T = new CommonToken(Syms.stringToInt[t.Symbol], t.Lexeme);
T.Line = t.Line;
tokens.Add(T);
}
var antlrtokenizer = new BufferedTokenStream(new ListTokenSource(tokens));
var parser = new calcParser(antlrtokenizer);
parser.BuildParseTree = true;
//optional: parser.ErrorHandler = new BailErrorStrategy ();
//'start' should be the name of the grammar's start symbol
var listener = new MyListener();
var walker = new ParseTreeWalker();
var antlrroot = parser.start();
walker.Walk(listener, antlrroot);
double v = Annotations.ptp.Get(antlrroot);
Console.WriteLine($"{v}");
}
