This is not using haskell-src-exts, but the Haskell Refactorer has a
structure to keep a parallel tree of tokens indexed by SrcSpan, which
attempts to allocate comments to the appropriate point.
See
https://github.com/alanz/HaRe/blob/master/src/Language/Haskell/Refact/Utils/....
It does not make use of the AST itself, so may be usable with
haskell-src-exts
Alan
On Tue, Aug 20, 2013 at 11:19 AM, Niklas Broberg
Hi Niklas,
1) My most desired feature would be a syntax tree that does not pluck
pluck comments out and make me treat them separately. It looks much easier to me to have a fully descriptive tree and (filter . concatMap) / traverse them out in some way than getting a list of comments and having to insert them back in the right places myself. Is that possible?
Sadly not - it's theoretically impossible. The fact that you can put comments literally wherever, means that it's impossible to treat them as nodes of the AST. E.g.
f {- WHERE -} x = -- WOULD -- THESE do -- COMMENTS a {- END -} <- g x -- UP return {- ? -} a
What would be theoretically possible is to define a restricted language that allows comments only in certain well-defined places (cf haddock), and ignores any others. That's a lot of work though, and it's not clear how big the gain is. :-\
A different solution could be to improve the support, through better helper functions, for handling a syntax tree and a list of comments together. That's something I think could be worthwhile.
2) Have you considered downloading the all-of-Hackage tarball and running haskell-src-exts over it to get a benchmark of how much HSE can already parse of the Haskell code out there?
Considered, yes. Done, no. Would love to see the results :-). The crew at OdHac (Roman, Erik, Simon) ensured that the current version handles all of 'base', which is a good start.
Cheers, Niklas
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