class test_grammar{

   public static void main(String args[]){

       if ( (args == null) || (args.length != 1)) {
          System.out.println ("Usage: java test_grammar <input-file>");
          System.exit (-1);
       }

       try{
       	parser p = new parser(args[0]);
       	p.parse();
       } catch (Exception e) {
       	e.printStackTrace();
       }

     }
     }