public static void Main(string[] args)
{
var input = "1 * (2 + 3) - 4";
Console.Write("Input:\n {0}\n\n", input);
var lexer = new SchoolLexer(input);
var parser = new SchoolParser(lexer);
Surface.Expr expr = parser.Parse();
Console.WriteLine("Print:");
var printer = new Printer();
printer.Print(expr);
Console.Write("\n\n");
var desugarer = new Desugarer();
Core.Expr coreExpr = desugarer.Desugar(expr);
var evaluator = new Evaluator();
Console.Write("Result:\n{0}\n\n", evaluator.Evaluate(coreExpr));
}
public int Evaluate(Core.Expr expr)
{
return(expr.Accept(this));
}