# Extracting Monadic Parsers from Proofs

## Alison Jones

(Swansea University)

This talk outlines a proof-theoretic approach to developing correct and terminating monadic parsers. Using modified realizability, we extract formally verified and terminating programs from formal proofs. By extracting both primitive parsers and parser combinators, it is ensured that all complex parsers built from these are also correct, complete and terminating for any input. We demonstrate the viability of our approach by means of two case studies: we extract (1) a small arithmetic calculator and (2) a non-deterministic natural language parser. The work is being carried out in the interactive proof system Minlog.

**Thursday 3rd March 2016, 15:00**

The Board Room

Department of Computer Science