[wg-camlp4] My uses of syntax extension

[Alain Frisch]

On 01/28/2013 03:47 PM, Hongbo Zhang wrote:
> Hi Alain,
>     Is there any chance to see your current work to decide how hard it
> would be to adapt p4 to your new syntax?

Which current work are you referring to?  The stuff about conditional 
compilation implemented on top of -ppx is there:

https://www.lexifi.com/blog/syntax-extensions-without-camlp4-lets-do-it

(I've just adapted the code to the current version of Ast_mapper.)

>    Btw: do you have a clear idea how to implement ast lifting in ppx(
> the meta filter in p4) which is an essential part in
> quasi-quotation?(the stream parsers have non-trivial optimizations
> which depends on it )

Unfortunately, I'm not sure to know what quasi-quotations are (compared 
to just "quotations" in camlp4 parlance).

Can you elaborate on which kinds of non-trivial optimizations in stream 
parser depend on ast lifting?  Compilers have implemented optimizations 
based on AST rewriting for decades without going meta, and I suspect 
that can probably be done for stream parser optimizations as well, but I 
might be proven wrong.


Alain