private static void writeSimpleUnary(GrExpression operand, GrUnaryExpression unary, ExpressionGenerator generator) {
    String opTokenText = unary.getOperationToken().getText();
    boolean isPostfix = unary.isPostfix();
    if (!isPostfix) {
      generator.getBuilder().append(opTokenText);
    }
    operand.accept(generator);
    if (isPostfix) {
      generator.getBuilder().append(opTokenText);
    }
  }
private static void writeSimpleUnary(GrExpression operand, GrUnaryExpression unary, ExpressionGenerator generator)