fuuzetsu / agdoparsec Goto Github PK

An Agda implementation of what aims to model the behaviour of Haskell's Attoparsec library.

This implementation simply uses Strings/[Char] and does not worry about the performance of the resulting parser. We are simply interested in a parser implementation that produces the same output as Attoparsec does.

The project is temporarily on hiatus as the author needs to rethink the goal.

The fundamental problem is that Attoparsec uses combinators from Alternative which are inherently non-terminating. What needs to happen is that we either end up using co-induction to model that or we only implement best-faith combinators, such as those only working on right-recursive grammars at which point it's not as close to the Attoparsec model as we'd like.

Nils Anders Danielsson appears to have written a parser library in Agda already but it does not compile with current Agda. I am currently waiting for him to find some time and give it a look.

Related reading:
http://www.andres-loeh.de/DependentlyTypedGrammars/DependentlyTypedGrammars.pdf
http://www.andres-loeh.de/STC-AgdaParsers.pdf
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.157.8813&rep=rep1&type=pdf
http://sneezy.cs.nott.ac.uk/fplunch/weblog/?p=271