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From: Anil Madhavapeddy <anil@recoil.org>
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To: Andy Ray <andy.ray@ujamjar.com>,
 Leo White <lpw25@cam.ac.uk>
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Subject: Re: [Caml-list] camlp4 for js_of_ocaml toplevels

On 22 Feb 2014, at 03:07, Andy Ray <andy.ray@ujamjar.com> wrote:

> Hi,
> 
> Is anyone working on making camlp4 extensions available in a
> js_of_ocaml toplevel?
> 
> I have seen the work the OCamlPro guys have done to get pa_js going by
> hacking the compiler itself - serious kudos for that!
> 
> Is there a reason why that's easier than js_of_ocaml compiling a
> (static) version of camlp4?

Leo White put together a custom compiler frontend for just this use
case a while back:

https://github.com/lpw25/ocaml-with-pp

The idea is that you build this with a static set of camlp4 extensions,
and it runs the input through camlp4 and then passes the AST directly
through to the compiler (via compiler-libs). 

It should be reasonably easy to adapt this to a toplevel model
as well -- let us know if you need a hand.

-anil