Over the last years, P4 has positioned itself as the primary language for data-plane programming. Despite its constant evolution, the P4 language still ``suffers'' from one significant limitation: the voluminosity of its code. P4 applications easily reach thousands of lines of code, becoming hard to develop, debug, and maintain. The reason is two-fold: P4 requires many characters to express individual concepts (verbosity), and it relies on code repetition (lack of parametrization).

Today, P4 users overcome this limitation by relying on templating tools, hand-crafted scripts, and complicated macros. Unfortunately, these methods are not optimal: they make the development process difficult and do not generalize well.

In this work, we propose reducing the voluminosity of P4 code by introducing higher-level constructs to the language. We present O4, an extended version of P4, that includes three higher-level abstractions: arrays (which group same-type entities together), loops (which reduce simple repetitions), and factories (which enable code parametrization).

We evaluate O4 on several state-of-the-art programs and show how, with respect to P4: (i) it reduces code volumes by up to 80%, (ii) it decreases code verbosity by 44% on average, and (iii) it cuts duplicated code by 60%. We show how these benefits come with just a 3.5% increase in compilation time.