  Formal Languages and Automata Theory are important foundational topics in
Computer Science. Their rigorous and formal characteristics make their learning
them demanding. An important support for the assimilation of concepts is the
possibility of interactively visualizing concrete examples of these
computational models, facilitating understanding them. The tools available are
neither complete nor fully support the interactive aspect. This project aims at
the development of an interactive web tool in Portuguese to help in an assisted
and intuitive way to understand the concepts and algorithms in question, seeing
them work step-by-step, through typical examples preloaded or built by the user
(an original aspect of our platform). The tool should therefore enable the
creation and edition of an automata, as well as execute the relevant classical
algorithms such as word acceptance, model conversions, etc. It is also intended
to visualize not only the process of construction of the automaton, but also
all the steps of applying the given algorithm. This tool uses the Ocsigen
Framework because it provides the development of complete and interactive web
tools written in OCaml, a functional language with a strong type checking
system and therefore perfect for a web page without errors. Ocsigen was also
chosen because it allows the creation of dynamic pages with a singular
client-server system. This article presents the first phase of the development
of the project. It is already possible to create automata, check the nature of
its states and verify step-by-step (with undo) the acceptance of a word.

Formal Languages and Automata Theory