/*---------------------------------------------------------------------------
File:         			Expression.java
Package:                        JFLAP Version 3.1
Author:			        Ted Hung
                                
Description of Contents:	holds a String and a State used in Parsing.
				
--------------------------------------------------------------------------*/

/* 
 * Susan H. Rodger, Magda Procopiuc, Octavian Procopiuc, Eric Gramond, Ted Hung
 * Computer Science Department
 * Duke University
 * August 1999
 * Supported by National Science Foundation DUE-9596002, DUE-9555084,
 *  and DUE-9752583
 *
 * Copyright (c) 1999
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the author.  The name of the author may not be used to
 * endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

package flap.operators;

import flap.*;

//
//
// Expression
//
//
public class Expression 
{
   /**
    * a string that identifies the particular expression
    */
   public String exp;

   /**
    * the state that corresponds to beginning of an FSA subunit
    * This is used by the Operators when being executed
    */
   public State state;

   public Expression(String str, State st)
   {
      exp = new String(str);
      if(st != null)
      {
	 state = new State(st);
      }
      else
      {
	 state = null;
      }
   }
}

