[Haskell-cafe] ECMA262 (Javascript) interpreter

Andrey Chudnov achudnov at gmail.com
Sun Dec 7 06:23:58 UTC 2014

1) Does it pass test-262?
2) I see you have implemented your own parser and AST? Have you looked 
at the other packages implementing/trying to implement that?

On 12/07/2014 12:48 AM, 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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