On Fri, 2008-11-28 at 23:27 +0000, Roly Perera wrote: > Hi, > > I've spent some time writing a parser using the Parsec library and was > looking > forward to being able to plug in some side-behaviour once I'd got the parser > working. > > Now it seems I can't actually do that in a nice way because Parsec appears to > be "fixed" to a simple State monad. > > I found this mentioned in the Cafe archives, but not much discussion. Is > there > a reason Parsec wasn't implemented using the monad transformer approach? Are > there any plans to open it up? It's a nice powerful library and a natural > thing to want to do for example would be to plug in something like a Reader > to > track a variable context. I guess one could abuse the State monad to achieve > the goal but that feels like the wrong tool for the job. > > Any insights appreciated.
Parsec3 is implemented as a monad transformer. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
