public Value CalculateFormula(string formula)
{
AntlrInputStream input = new AntlrInputStream(formula); //2. parse is to AntlrIS
calculatorLexer lexer = new calculatorLexer(input); //3. lexer created from AntlrIS
CommonTokenStream tokens = new CommonTokenStream(lexer); //4. want to save tokens from the lexer
calculatorParser parser = new calculatorParser(tokens); //5. feed these tokens from lexer when creating the parser
IParseTree tree = parser.block(); //6. run parser using parser.prog() and save output in IParseTree
//Console.WriteLine(tree.ToStringTree(parser)); //7.
CalcVisitor visitor = new CalcVisitor(); //8. CalcVisitor will do the evaluations
Value ret = visitor.Visit(tree.GetChild(0));
//Console.WriteLine(ret); //z. CalcVisitor performs the actual evaluations + then write output
return(ret);
}
static void Main(string[] args)
{
StreamReader inputStream = new StreamReader(Console.OpenStandardInput()); //1. type in our expressions
AntlrInputStream input = new AntlrInputStream(inputStream.ReadLine()); //2. parse is to AntlrIS
calculatorLexer lexer = new calculatorLexer(input); //3. lexer created from AntlrIS
CommonTokenStream tokens = new CommonTokenStream(lexer); //4. want to save tokens from the lexer
calculatorParser parser = new calculatorParser(tokens); //5. feed these tokens from lexer when creating the parser
IParseTree tree = parser.block(); //6. run parser using parser.prog() and save output in IParseTree
//Console.WriteLine(tree.ToStringTree(parser)); //7.
CalcVisitor visitor = new CalcVisitor(); //8. CalcVisitor will do the evaluations
//Console.WriteLine("Tree: " + visitor.Visit(tree.GetChild(0))); //z. CalcVisitor performs the actual evaluations + then write output
//dont dropout before i can see return
Console.ReadKey();
}
