Re: A few questions about c++-ts-mode.

[Yuan Fu]

> On May 8, 2024, at 2:05 PM, Ergus <spacibba@aol.com> wrote:
> 
> Hi Eli and Yuan
> 
> On May 8, 2024 3:35:52 PM GMT+02:00, Eli Zaretskii <eliz@gnu.org> wrote:
>>> From: Yuan Fu <casouri@gmail.com>
>>> Date: Tue, 7 May 2024 17:19:53 -0700
>>> Cc: emacs-devel@gnu.org
>>> 
>>>> 1. namespaces are not fontified like in c-mode (i.e in std::string the
>>>> `std` used to have font-lock-constant-face while `string` used to have
>>>> font-lock-type-face). It seems like tresitter identifies properly them
>>>> like (namespace_identifier) and (type_identifier)
>>> 
>>> Then we probably want to fontify namespaces in constant face. Or perhaps 
>>> add a namespace-face that inherits from constant face.
>> 
>> I think using font-lock-constant-face is fine.  Patches welcome.
>> 
>>>> 2. Doc string comments are fontified like normal comments. It looks like
>>>> treesiter does not recognize them at all. Is this something we need to
>>>> report to treesitter or we need to workaround it in emacs side?
>>> 
>>> I’m working on that. I think the best way is to workaround it in Emacs.
>> 
>> Please note that some of those specially-formatted comments are
>> explicitly supported by the grammar.
>> 
> 
> It looks like tree sitter already supports this using language injection:
> 
> <https://github.com/tree-sitter/tree-sitter-cpp/issues/116>
> 
> I am not sure if we can handle this same way in emacs. Or if it is a better 
> or worst approach than using a made in home workaround.

Emacs supports language injection (in the name of embedded parser), see 38.7 
Parsing Text in Multiple Languages in elisp manual.

The workaround we were talking about is just fontifynig the /** comments with 
font-lock-doc-face, nothing fancy. For more elaborate effect you’d need doxygen 
grammar. 

Yuan