ParserAction.cs :  » Script » IronRuby » gpcc » C# / CSharp Open Source

// Copyright (c) Microsoft Corporation. All rights reserved.

using System;


namespace gpcc{
  public abstract class ParserAction
  {
        public abstract int ToNum();
  }


  public class Shift : ParserAction
  {
    public State next;

    public Shift(State next)
    {
      this.next = next;
    }

    public override string ToString()
    {
      return "shift, and go to state " + next.num;
    }

        public override int ToNum()
        {
            return next.num;
        }
  }


  public class Reduce : ParserAction
  {
    public ProductionItem item;

    public Reduce(ProductionItem item)
    {
      this.item = item;
    }

    public override string ToString()
    {
      return "reduce using rule " + item.production.num + " (" + item.production.lhs + ")";
    }

        public override int  ToNum()
        {
            return -item.production.num;
        }
  }
}