[Haskell-cafe] Retrieving Haddock comments with haskell-src-exts

[Niklas Broberg]

Hi Mateusz,

haskell-src-exts is not haddock-aware I'm afraid, so I don't have any real
solution for you. The one you mention, i.e. going through the whole parse
result and stiching things together manually seems like the best bet if you
want to use haskell-src-exts throughout.

In the longer run, it would be nice to have haddock support in
haskell-src-exts, so ideas regarding what kind of interface you would like
to see are most welcome. :-)

Cheers, Niklas


On Wed, Aug 14, 2013 at 4:57 PM, Mateusz Kowalczyk
<fuuzetsu at fuuzetsu.co.uk>wrote:

> I'm writing a small tool to help to analyse Haddock comments in
> Haskell source files to help me to indicate any potential breakage to
> documentation in existing source files.
>
> Currently I'm doing the parsing with the GHC's ‘parser’ function with
> Opt_Haddock set and I filter out everything I don't need. There are
> problems with this approach: determining any extensions and options
> used is vital for valid parsing of the files and a large amount of
> source files outright fails to parse without this information.
>
> Fortunately, haskell-src-exts exists and it can deal with all (or
> most) of this for me. Unfortunately, there doesn't seem to be any way
> to get it to recognise Haddock comments and the only option available
> is all comments or no comments at all. It's not easily possible to
> stitch these together without analysing the whole parse result.
>
> Currently I'm thinking of parsing out extensions and pragmas used
> using haskell-src-exts and then feeding those to GHC, effectively
> parsing the second time. Is there a way to avoid this?
>
> There's ‘lexTokenStream’ but I believe it has similar problems to
> ‘parser’, that is, needing to know the extensions beforehand.
> --
> Mateusz K.
>
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