[Haskell-cafe] GHC API - list all exports of a module

[Alan & Kim Zimmerman]

Have you looked at ModuleInfo [1] ?

This is accesible from a TypecheckedModule.

And what do you mean by the exported declarations?

If you are prepared to use the HaRe API (ony up to GHC 7.6.3) you can use
definingDeclsNames [2]

[1]
https://downloads.haskell.org/~ghc/7.8.3/docs/html/libraries/ghc-7.8.3/GHC.html#t:ModuleInfo
[2]
http://hackage.haskell.org/package/HaRe-0.7.2.8/docs/Language-Haskell-Refact-API.html#v:definingDeclsNames




On Mon, Feb 2, 2015 at 6:58 PM, Jochen Keil <jochen.keil at gmail.com> wrote:

> Hi Erik,
>
> On 02.02.2015 12:55, Erik Hesselink wrote:
> > On Mon, Feb 2, 2015 at 12:46 PM, Jochen Keil <jochen.keil at gmail.com>
> wrote:
> >> Hello Peter,
> >>
> >> On 02.02.2015 12:31, Peter Simons wrote:
> >>> Hi Jochen,
> >>>
> >>>  > My main goal would be to have a program which takes two modules of
> >>>  > different versions, compare them and highlight the differences
> >>>  > between them.
> >>>
> >>> maybe http://hackage.haskell.org/package/hackage-diff would work for
> >>> your purposes?
> >>
> >> Thanks for the hint, this looks pretty good.
> >>
> >> One thing though: hackage-diff uses haskell-src-exts for parsing
> >> modules. Does haskell-src-exts re-use the GHC API or does it run its own
> >> parser? (from a quick glance I'd say the latter case)
> >
> > There are basically two routes to choose from with such a tool (of
> > which a few already exist, I think): you can use GHC and its API, like
> > you're doing, or you can use haskell-src-exts, which is a separate
> > parser, and use haskell-names for name resolution (and
> > haskell-packages for dependency information). Sadly there's no
> > haskell-type-exts for typechecking (yet). The GHC route is probably
> > more powerful, the haskell-suite route is simpler and doesn't depend
> > on GHC.
>
> thanks for the clarification!
> Indeed it seems to me that the GHC approach is more powerful, because
> after running the typechecker I would have the AST available for
> comparing modules (did I get this right?). Drawback would obviously be
> the need for running the typechecker. :)
>
> So, just for the sake of my curiosity:
> Is there a way to get the exported declarations (and not just the
> RdrNames) from GHC without running the typechecker?
> I don't understand why it's necessary to run the typechecker in order to
> get this list. The parser already returns a list with all declarations,
> so shouldn't it be possible to filter this list for only the exported ones?
>
> Thanks,
>   Jochen
>
>
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