/// <summary>
/// Using http://programming-pages.com/2013/12/14/antlr-4-with-c-and-visual-studio-2012/ as a guide.
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
string test = "a = 10*10";
var input = new AntlrInputStream(test);
var lexer = new calculatorLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
var parser = new calculatorParser(tokens);
var tree = parser.equation();
Console.WriteLine(tree.ToStringTree(parser));
}
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);
}
