Re: PL support

[Dmitry Gutov]

On 09.05.2020 22:49, Dmitry Gutov wrote:
> > Looking at TreeSitter's repository, it looks like the parser generator 
> > itself is written in Rust (which could be linked directly into Emacs), 
> > the JS-specific grammar bit is pretty small and directly translatable 
> > to elisp [1], and the output of the parser generator is a bunch of 
> > tables that could, in principle, be used directly instead of having to 
> > round-trip through a C compiler.
>
> I guess the question is how fast this is going to work, compared to the 
> original. Then the details of the Elisp interface. And also our ability 
> to keep up with the grammars and TreeSitter's development (new features, 
> api changes, etc).

Just something I have stumbled on by chance:

https://marijnhaverbeke.nl/blog/lezer.html

Lezer is a parser system that compiles to JavaScript (an interpreted 
language closer Emacs Lisp than C), inspired by TreeSitter but making 
some different tradeoffs WRT performance and memory use.

It uses its own grammars, however: 
https://github.com/lezer-parser/lezer/issues/7