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It is imperative to democratize robotic process automation (RPA), as RPA hasbecome a main driver of the digital transformation but is still technicallyvery demanding to construct, especially for non-experts. In this paper, westudy how to automate an important class of RPA tasks, dubbed web RPA, whichare concerned with constructing software bots that automate interactions acrossdata and a web browser. Our main contributions are twofold. First, we develop aformal foundation which allows semantically reasoning about web RPA programsand formulate its synthesis problem in a principled manner. Second, we proposea web RPA program synthesis algorithm based on a new idea called speculativerewriting. This leads to a novel speculate-and-validate methodology in thecontext of rewrite-based program synthesis, which has also shown to be boththeoretically simple and practically efficient for synthesizing programs fromdemonstrations. We have built these ideas in a new interactive synthesizercalled WebRobot and evaluate it on 76 web RPA benchmarks. Our results show thatWebRobot automated a majority of them effectively. Furthermore, we show thatWebRobot compares favorably with a conventional rewrite-based synthesisbaseline implemented using egg. Finally, we conduct a small user studydemonstrating WebRobot is also usable.

WebRobot: Web Robotic Process Automation using Interactive Programming-by-Demonstration