[Haskell-cafe] ECMA262 (Javascript) interpreter

Tobias Dammers tdammers at gmail.com
Mon Dec 8 12:59:30 UTC 2014

I'm kind of fiddling with solving the same (almost) problem, but since
you seem to have done most of the heavy lifting already, I'd like to
know whether your implementation could fit my needs.

Specifically, my use case is that I want to use JavaScript as a
scripting language for a host application written in Haskell; this could
be a game, or a CMS/blogging platform, or anything else that needs
scripting; one of the must-have requirements is to parametrize the
interpreter over arbitrary monads, such that it can be sandboxed into
whatever monad stack you need to script over.

On Sun, Dec 07, 2014 at 03:48:47PM +1000, Fabian Bergmark wrote:
> I have been implementing an ECMA-262 (Javascript) interpreter over the
> last few weeks. I have been following
> http://www.ecma-international.org/ecma-262/5.1 and tried to keep my
> implementation as close to the specification as possible.
> The code can be found here https://github.com/fabianbergmark/ECMA-262
> So far I have implemented the core language, but has yet to write all
> the specification functions (Array.splice, String.substring etc.).
> Before I do this and release it on hackage, I would appreciate
> feedback on my implementation.
> The issues I see at the time are:
> * The parser is slow for deeply nested code
> * Strict mode is not implemented
> * Interpret.hs is ~ 6k lines
> * SubType.hs uses IncoherentInstances, and a better implementation
> would be nice. At the moment it works but for one case.
> To test the code, install the cabal package and run ecma262 on a .js
> file. One host object, console.log is provided and prints to stdout.
> Fabian Bergmark
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Tobias Dammers - tobias at twokings.nl - 070-3457628 - www.twokings.nl
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