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Re: Tree sitter support for C-like languages

From: Visuwesh
Subject: Re: Tree sitter support for C-like languages
Date: Tue, 15 Nov 2022 23:57:13 +0530
User-agent: Gnus/5.13 (Gnus v5.13)

[செவ்வாய் நவம்பர் 15, 2022] Eli Zaretskii wrote:

>> From: Stefan Monnier <monnier@iro.umontreal.ca>
>> Cc: Yuan Fu <casouri@gmail.com>,  theo@thornhill.no,  emacs-devel@gnu.org
>> Date: Tue, 15 Nov 2022 11:01:24 -0500
>> > I guess we need to report these to the developers of the Tree-sitter's
>> > C parser?  Is there anything else we could do until they fix
>> > the parser?
>> AFAIK the tree-sitter parser parses basically already-preprocessed C.
>> It's wickedly hard to parse meaningfully notyet-preprocessed C with
>> something based on a BNF grammar.
> There are a lot of macros in our code that tree-sitter based C mode
> gets right, so I'm not sure this is accurate.
>> So my guess is that this is going to be a "wont fix".
> Maybe we should grow some augmentations for tree-sitter, at least
> given enough time.  Or maybe it's possible to identify the parts where
> this happens by some tree-sitter indications, and tweak the faces in
> those regions in some way.

I'm not sure how similar the emacs-tree-sitter
(https://github.com/ubolonton/emacs-tree-sitter) and Yuan's code are but
in his EmacsConf 2020 talk, Tuấn-Anh Nguyễn wrote some custom
tree-sitter query (?) to correctly parse our macros and highlighted the
type, the function name, etc. with the approriate faces.
You can find his talk here: https://emacsconf.org/2020/talks/23 and his
demonstration of the Emacs source code is around the 20 minute mark
(after a quick search in the subtitles).

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