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. On Fri, Feb 22, 2013 at 7:12 PM, adam vogt wrote:

On Fri, Feb 22, 2013 at 12:44 PM, Corentin Dupont wrote:

...

Hi all, I have a program able to read another program as a string, and interpret it (using Hint). I'd like to make unit tests, so I have a file "Test.hs" containing a serie of test programs as strings. However, how could I be sure that these test program are syntactically valid, at compile time?

Hi Corentin,

You could write the test programs like:

test1 :: String test1 = [qq| x+1 == 3 |]

Where qq is a QuasiQuoter you have to define. It could try to parse the string with http://hackage.haskell.org/package/haskell-src-exts, and if that succeeds, returns the original string.

-- Adam

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 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/htm...

...

.

Francesco

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

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@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 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/htm...

...

.

Francesco