Hi Warren,
On Thu, Apr 12, 2012 at 6:31 PM, Warren Harris
I wrote a parsec parser that does symbols lookups during the parsing process (ParsecT String Store IO a). Now I'd like to write a pretty printer that does the reverse. Unfortunately there doesn't appear to be a transformer version of Text.PrettyPrint.HughesPJ. Can anyone suggest a way to do this? Thanks,
It seems like the opposite would be a function of type 'a -> Store -> IO Doc'. Maybe a function of type 'a -> ReaderT Store IO Doc' could be easier to work with. If you go this route you could write a lifted versions of (<>), (<+>), hcat etc. An example: (<>) :: Applicative m => m Doc -> m Doc -> m Doc I haven't tried any of this, so I'm not sure if you would get any big win over just using the first suggestion (a function of type 'a -> Store -> IO Doc') and using the stock combinators and threading the store around by hand. But do let me know if something works out. Antoine