/*  SCCS - @(#)ExprsNode.java	1.2 - 02/28/99 - 12:39:10 */

/*
 * Copyright (c) 1997 USC Brain Project. email nsl@java.usc.edu.
*/
//
// ExprsNode
////////////////////////////////////////////////////////////

/**
 * ExprsNode - General expression statement List
 */
package npp.src.util;

import java.lang.String;
import java.util.Vector;
import pp.src.jbf.*;

public class ExprsNode extends YYtoken{

  /** Unary Expression node construction
   */
  public ExprsNode(YYtoken t) {
    super(YYtokentypes.nt_expression, t.text, t.lineno, t.charno, t.charno0);
    list = new Vector();
    list.addElement(t);
    processed = false;
    code0=t.text;
  }

  public void addHead(YYtoken t) {
    list.insertElementAt(t, 0);
    code0=t.text+","+code0;
  }

  public void addTail(YYtoken t) {
    list.addElement(t);
    code0=code0+","+t.text;
  }

  public void remove() {
    list.removeAllElements();
    code0="";
  }

  public int size() {
    return list.size();
  }


  /**
   * Code generation. 
   * Generate all expressions in the list
   * @param npp Nsl Preprocessor
   * @return error value
   */
  public int genCode(NslPreProcessor npp) {
   java.util.Enumeration E = list.elements();
   ExprNode expr;
   //System.out.println("in genCode for ExprsNode***");
   while(E.hasMoreElements()) {
     expr = (ExprNode)E.nextElement();
     expr.genCode(npp);
     if(expr.processed) processed = true;
   }
   return NO_OP;

  }

  public final static int NO_OP = 0;
  public Vector list;
  public String code; 
  public boolean processed;
  public String code0="";
}