Re: Parser extensions (maybe for 10?)

On 04/12/2016 06:45 AM, Craig Ringer wrote:
> On 12 April 2016 at 12:36, Arcadiy Ivanov <arcadiy(at)gmail(dot)com
> <mailto:arcadiy(at)gmail(dot)com>> wrote:
>
>
> Is there any interest and/or tips to allow a pluggable parser or
> at least allow some syntactical pluggability by extensions?
> I think this may allow some projects to move towards becoming an
> extension as opposed to forking the project entirely.
>

FWIW, I have previously sketched a "syntax rewriter" of sorts: a simple
filter which is applied to input before the lexer even sees it.
Quite some "syntax magic" can be achieved by allowing an extension to
*hook* into this functionality in order to do some rewriting; If turning
one statement into several (multi-statement) is also allowed quite some
serious emulation could be achieved.

I can certainly prepare a small patch for the first commitfest of 9.7 if
this sounds viable.

Thanks,

/ J.L.