final public void atom() throws ParseException {
             /*@bgen(jjtree) atom */
             SimpleNode jjtn000 = new SimpleNode(JJTATOM);
             boolean jjtc000 = true;
             jjtree.openNodeScope(jjtn000);Token value;
    try {
         jjtn000.operators = new Vector<Integer>();jjtn000.negative=false;
      label_3:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case OP_SUM:
        case OP_DIFF:
          ;
          break;
        default:
          jj_la1[18] = jj_gen;
          break label_3;
        }
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case OP_DIFF:
          jj_consume_token(OP_DIFF);
                    jjtn000.negative = !jjtn000.negative;
          break;
        case OP_SUM:
          jj_consume_token(OP_SUM);
          break;
        default:
          jj_la1[19] = jj_gen;
          jj_consume_token(-1);
          throw new ParseException();
        }
      }
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case VAR:
      case VAR_LOCAL:
      case NUM:
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case NUM:
          value = jj_consume_token(NUM);
                                                  jjtn000.operators.add(constants.NUM);
          break;
        case VAR:
          value = jj_consume_token(VAR);
                                                  jjtn000.operators.add(constants.VAR);
          break;
        case VAR_LOCAL:
          value = jj_consume_token(VAR_LOCAL);
                                          jjtn000.operators.add(constants.VAR_LOCAL);
          break;
        default:
          jj_la1[20] = jj_gen;
          jj_consume_token(-1);
          throw new ParseException();
        }
                    jjtree.closeNodeScope(jjtn000, true);
                    jjtc000 = false;
                   jjtn000.numVar =value.toString();
        break;
      case PAR_OPEN:
        jj_consume_token(PAR_OPEN);
        SumExpr();
        jj_consume_token(PAR_CLOSE);
        break;
      default:
        jj_la1[21] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
    } catch (Throwable jjte000) {
          if (jjtc000) {
            jjtree.clearNodeScope(jjtn000);
            jjtc000 = false;
          } else {
            jjtree.popNode();
          }
          if (jjte000 instanceof RuntimeException) {
            {if (true) throw (RuntimeException)jjte000;}
          }
          if (jjte000 instanceof ParseException) {
            {if (true) throw (ParseException)jjte000;}
          }
          {if (true) throw (Error)jjte000;}
    } finally {
          if (jjtc000) {
            jjtree.closeNodeScope(jjtn000, true);
          }
    }
  }