using System;
using Ilog.Language.Parsing;

public class PartialCalculator
{
  public static void Main ()
    {
      try
        {
          CalculatorTokenizer t;

          t = new CalculatorTokenizer("",false);

          try
            {
              CalculatorParser p = new CalculatorParser(t);

              String input;

              p.ParseTreeType = GenericParser.COMPACT_TREE;
//            p.toggleTrace();
              
              Console.WriteLine("\n---------------------------------------------\n");

              p.ParseExpression(input="1+2");
              Console.WriteLine("\nThe value of "+input+" is "+p.CurrentNode.NValue);
              Console.WriteLine("\nPARSE TREE:\n");
              p.CurrentNode.Show();

              Console.WriteLine("\n---------------------------------------------\n");

              p.ParseDefinition("pi = 22/7");
              Console.WriteLine("\nDefining pi as "+p.CurrentNode.NValue);
              Console.WriteLine("\nPARSE TREE:\n");
              p.CurrentNode.Show();

              Console.WriteLine("\n---------------------------------------------\n");
              
              p.ParseExpression("2 * pi");
              Console.WriteLine("\nTwice this pi is "+p.CurrentNode.NValue);
              Console.WriteLine("\nPARSE TREE:\n");
              p.CurrentNode.Show();

              Console.WriteLine("\n---------------------------------------------\n");
            }
          catch (Exception e)
            {
              Console.WriteLine("*** Parsing error: "+e);
            }
        }
      catch (Exception e)
        {
          Console.WriteLine("*** Tokenizing error: "+e);
        }
    }
}