case JJTFLOORDIV_2OP:
ret = new BinOp(null, BinOp.FloorDiv, null);
break;
case JJTPOS_1OP:
ret = new UnaryOp(UnaryOp.UAdd, null);
break;
case JJTNEG_1OP:
ret = new UnaryOp(UnaryOp.USub, null);
break;
case JJTINVERT_1OP:
ret = new UnaryOp(UnaryOp.Invert, null);
break;
case JJTNOT_1OP:
ret = new UnaryOp(UnaryOp.Not, null);
break;
case JJTIMPORT:
ret = new Import(null);
break;