[Haskell-cafe] Re: Re: Re: Reflective capabilities of Haskell (cont'd)

Martin Hofmann martin.hofmann at uni-bamberg.de
Thu Mar 13 05:59:15 EDT 2008

On Wed, 2008-03-12 at 15:59 -0400, Jeff Polakow wrote:
> > Data.Generics allows you to do this (to a certain extent), i.e. 
> > there is a function 
> > 
> >     dataTypeConstrs :: DataType -> [Constr] 
> > 
> It might be hard, or even impossible, to get Data.Typeable and
> Data.Generics to play with each other. There seems to be no good way
> of converting a Data.Typeable.TypeRep to a
> Data.Generics.Basics.DataType. 
> Another option might be to use Language.Haskell.Parser and
> Language.Haskell.Syntax, but I have little experience with this and am
> not sure if you'll be able to do what you want. 
On Wed, 2008-03-12 at 23:08 -0700, oleg at okmij.org wrote:
> > Thanks a lot, this helps a bit, but access to function bodies is exactly
> > what I need 
> Then perhaps you might like the method of reconstructing bodies (of
> possibly compiled) functions
> 	http://okmij.org/ftp/Computation/Generative.html#diff-th
> in the form of AST -- the template Haskell AST. The reconstructed
> bodies of functions can be arbitrarily manipulated (e.g.,
> _symbolically_ differentiated or algebraically simplified) and then
> converted `back' to the compiled code.

Thanks for the hints, they all seem to be promising, at least for some part of my problem.  I'll try it out whether I can put them together.



More information about the Haskell-Cafe mailing list