Thanks Greg, interesting thought. It would work the other way around, but it'd be easy enough to set up a node server to run the javascript. There's no IO allowed or any other blocking operations so I can make this all automatic. Still, that's another moving part I'd just as soon not have.

Strange there's no JavaScript embedding in GHC, or there doesn't seem to be.

Cheers,
Bob

On 2012-09-09, at 6:24 PM, Greg Fitzgerald <garious@gmail.com> wrote:

Hi Bob,

> All I really need is to allow users to write some JavaScript 
> that accepts a single JSON 'file/string' from my Haskell 
> program and produces another JSON 'file/string' that my 
> Haskell program will accept.

One option is to make your Haskell program an HTTP server, and then use Node.js to send and receive JSON files.

http://www.happstack.com/docs/happstack-lite-7.2.0/doc/html/happstack-lite/index.html

http://nodejs.org/

-Greg


On Sat, Sep 8, 2012 at 12:08 PM, Bob Hutchison <hutch-lists@recursive.ca> wrote:
Hi,

I've looked around with no success… this surprises me actually. Has anyone embedded SpiderMonkey, V8, or any other relatively decent JavaScript interpreters in GHC (using the FFI)?

I did find http://justinethier.github.com/husk-scheme/ which is a scheme R5RS implementation (I could make this work). There's also some work done embedding Lua. I also found a number of packages that compile javascript to Haskell, or the other way around, but I don't need that kind of thing.

All I really need is to allow users to write some JavaScript that accepts a single JSON 'file/string' from my Haskell program and produces another JSON 'file/string' that my Haskell program will accept.

Thanks,
Bob
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