class ParserVal
{
    Integer ival;
    Double dval;
    String sval;
    Object obj;
    Object[] objlist;
    Integer present;

    public ParserVal(Node node)
    {
	present = 1;
	ival = 0;
	dval = 0.0;
	sval = "";
	obj = node;
	objlist = null;
    };
    public ParserVal(Node[] nodelst)
    {
	present = 1;
	ival = 0;
	dval = 0.0;
	sval = "";
	obj = null;
	objlist = nodelst;
    };

    public ParserVal(boolean bool)
    {
	present = 1;
	ival = 0;
	dval = 0.0;
	sval = "";
	if (bool)
	    obj = new Integer(1);
	else
	    obj = new Integer(0);
   };
    public static boolean is_present(ParserVal it)
    {
	return (it.present == 1);
    }
    public ParserVal()
    {
	present = 1;
	ival = 0;
	dval = 0.0;
	sval = "";
	obj = null;
	objlist = null;
    };

    public Node NodeCvt()
    {
	Node it = Node.class.cast(this.obj);
	return it;
    };
    public Node[] NodelstCvt()
    {
	Node[] it = Node[].class.cast(this.objlist);
	return it;
    };
    public static ParserVal conc(ParserVal a, ParserVal b)
    {
	Integer present = new Integer(1);
	Node a1 = a.NodeCvt();
	Node b1 = b.NodeCvt();
	ParserVal c = new ParserVal(ListHeaderNode.mklist(a1,b1));
	return c;
    };
}