Fwd: [Haskell-cafe] DSL libraries

[Dupont Corentin]

Nobody had the compilation messages I had?

---------- Forwarded message ----------
From: Dupont Corentin <corentin.dupont at gmail.com>
Date: Tue, Nov 2, 2010 at 2:30 PM
Subject: [Haskell-cafe] DSL libraries (Was: Map constructor in a DSL)
To: steffen <steffen.siering at googlemail.com>, haskell-cafe at haskell.org


Hello Steffen,
can you compile AwesomePrelude?
I've got error messages (see below).

By the way, I've looked at some DSLs made in Haskell, if I don't mistake
there are lots of similarities between them.
There similarities could be put in a library to help the implementors of a
DSL, more or less like AwesomePrelude.

Is there already packages on Hackage dealing with that?

Cheers,
Corentin

AwesomePrelude compilation error:
I'm using GHC 6.12.1.

> cd tomlokhorst-AwesomePrelude-9819315
> cabal install
(...)
Warning: Lang.Haskell: Instances of type and data families are not yet
supported. Instances of the following families will be filtered out:  H


Then, when trying with a very simple GATD in GHCI, I've got:

<interactive>: HSAwesomePrelude-0.1.0.o: unknown symbol
`AwesomePreludezm0zi1zi0_
CompilerziLiftDefinitions_inline_closure'
ghc: unable to load package `AwesomePrelude-0.1.0'



On Thu, Oct 28, 2010 at 2:02 PM, steffen <steffen.siering at googlemail.com>wrote:

> I think you would love to have a look at AwesomePrelude[1] or a fork
> of AwesomePrelude using associated types[2]
> Some more background information by Tom Lokhorst [3][4].
>
> [1] http://github.com/tomlokhorst/AwesomePrelude
> [2] http://github.com/urso/AwesomePrelude
> [3] http://tom.lokhorst.eu/2009/09/deeply-embedded-dsls
> [4] http://tom.lokhorst.eu/2010/02/awesomeprelude-presentation-video
>
> On 28 Okt., 12:09, Dupont Corentin <corentin.dup... at gmail.com> wrote:
> > Thank you for your rich responses.
> >
> > Indeed I think I miss some thinks in my DSL, that would make things
> easier
> > to deal with lists and first class functions.
> > I don't really know what for now.
> > Perhaps a List Constructor? Or a constructor on functions like yours
> Ryan?
> > EAp :: Exp ref (a -> b) -> Exp ref a -> Exp ref b
> > It's from which DSL? It is accessible on the net?
> >
> > Chris suggested me that I can only define the Foldr constructor and
> deduce
> > Map from it.
> > But maybe I have to add a List constructor for that.
> >
> > But in the suggestions from Ryan and Brandon I don't understand why I
> should
> > add an extra type parameter and what it is!
> >
> > Steffen: Wow nice. I'll integrate that ;)
> >
> > I'm also looking at the Atom's DSL to get inspiration.
> > Something I don't understand in it is that it has two languages, on
> typed:
> >
> > data E a where
> >   VRef    :: V a -> E a
> >   Const   :: a -> E a
> >   Cast    :: (NumE a, NumE b) => E a -> E b
> >   Add     :: NumE a => E a -> E a -> E a
> > etc.
> >
> > And, along with it, an untyped counterpart:
> >
> > -- | An untyped term.
> > data UE
> >   = UVRef UV
> >   | UConst Const
> >   | UCast  Type UE
> >   | UAdd   UE UE
> > etc.
> >
> > What that for? What's the use of having beautiful GADT if you have to
> > maintain an untyped ADT aside??
> >
> > Corentin
> >
> > _______________________________________________
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> > Haskell-C... at haskell.orghttp://
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