In Yacc is dead (2010) Matthew Might and David Darais of the University of Utah, Salt Lake City...

present two novel approaches to parsing context-free languages. The first approach is based on an extension of Brzozowskiâ€™s derivative from regular expressions to context-free grammars. The second approach is based on a generalization of the derivative to parser combinators. The payoff of these techniques is a small (less than 250 lines of code), easy-to-implement parsing library capable of parsing arbitrary context-free grammars into lazy parse forests. Implementations for both Scala and Haskell are provided. Preliminary experiments with S-Expressions parsed millions of tokens per second, which suggests this technique is efficient enough for use in practice.

It seems every problem in computer science can be solved with either one more level of indirection or a derivative.

## Recent comments

1 hour 15 min ago

13 hours 11 min ago

1 day 17 hours ago

1 day 22 hours ago

1 day 22 hours ago

3 days 19 hours ago

3 days 21 hours ago

3 days 22 hours ago

4 days 3 hours ago

4 days 4 hours ago