[Haskell-cafe] Type checking the content of a string

[Corentin Dupont]

Up on that, anybody already tried to load an haskell interpreter in a
QuasiQuoter?

On Sat, Feb 23, 2013 at 12:03 AM, Corentin Dupont <corentin.dupont at gmail.com
> wrote:

> I'm trying to load my interpreter in the Q monad:
>
> cr :: QuasiQuoter
> cr = QuasiQuoter { quoteExp = quoteRuleFunc}
>
> quoteRuleFunc :: String -> Q TH.Exp
> quoteRuleFunc s = do
>    res <- runIO $ runInterpreter $ do
>       setImports ["Prelude", "Language.Nomyx.Rule",
> "Language.Nomyx.Expression", "Language.Nomyx.Test",
>                "Language.Nomyx.Examples", "GHC.Base", "Data.Maybe"]
>       interpret s (as :: RuleFunc)
>    case res of
>       Right _ -> [| s |]
>       Left e -> fail $ show e
>
>
>  However, I always obtain an error durring compilation:
>
> ...
> Loading package XXX ... linking ... done.
>
>
> GHCi runtime linker: fatal error: I found a duplicate definition for symbol
>    __stginit_ghczm7zi4zi1_DsMeta
> whilst processing object file
>    /usr/lib/ghc/ghc-7.4.1/libHSghc-7.4.1.a
> This could be caused by:
>    * Loading two different object files which export the same symbol
>    * Specifying the same object file twice on the GHCi command line
>    * An incorrect `package.conf' entry, causing some object to be
>      loaded twice.
> GHCi cannot safely continue in this situation.  Exiting now.  Sorry.
>
>
> I vaguely understand that the interpreted modules are conflicting with the
> compiled ones...
>
>
>
> On Fri, Feb 22, 2013 at 11:51 PM, Corentin Dupont <
> corentin.dupont at gmail.com> wrote:
>
>> Great! That seems very powerful. So you can do what you want during
>> compilation, readin files, send data over the network?
>> Other question, in my example how can I halt the compilation if a test
>> program is wrong?
>>
>>
>> On Fri, Feb 22, 2013 at 8:30 PM, Francesco Mazzoli <f at mazzo.li> wrote:
>>
>>> At Fri, 22 Feb 2013 19:43:51 +0100,
>>> Corentin Dupont wrote:
>>> > Hi Adam,
>>> > that looks interresting. I'm totally new to TH and QuasiQuotes, though.
>>> > Can I run IO in a QuasiQuoter? I can run my own interpreter.
>>>
>>> Yes, you can:
>>> <
>>> http://hackage.haskell.org/packages/archive/template-haskell/2.8.0.0/doc/html/Language-Haskell-TH.html#v:runIO
>>> >.
>>>
>>> Francesco
>>>
>>
>>
>
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