"eval" in ghc(i)?

Geoffrey Alan Washburn geoffw at cis.upenn.edu
Wed May 3 15:20:52 EDT 2006

	I have an application written in OCaml that I'm interested in porting 
over to Haskell, and I was wondering what the best way to replace the 
following OCaml function would be:


let eval txt = let lb = (Lexing.from_string txt) in
  let phr = !Toploop.parse_toplevel_phrase lb in
  Toploop.execute_phrase true Format.std_formatter phr;;

eval "let add1 x = x +1;;";;
eval "add1 2;;";;

Where I would like to be able to "eval" Haskell-code instead.  It looks 
like I might be able to achieve something like this using hs-plugins, 
but it looks a bit more complex.  Is hs-plugins the best choice for this 
kind of "meta"-programming?  I'm pretty sure Template Haskell will not 
work for me, at least as I understand it I can only manipulate program 
fragments that will be compiled later and as such that it will not be 
possible to execute them until the next "phase".

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