From: "Óscar Fuentes" <ofv@wanadoo.es>
To: emacs-devel@gnu.org
Subject: Re: Help sought from C++ expert: is this `value' a type or something else (what)?
Date: Thu, 19 Jan 2023 17:22:41 +0100 [thread overview]
Message-ID: <87sfg68pf2.fsf@telefonica.net> (raw)
In-Reply-To: Y8lZYoDmlzEmKLra@ACM
Alan Mackenzie <acm@muc.de> writes:
> Hello, Emacs.
>
> In the following test file, templates-9.cc from the CC Mode test suite,
> on the indicated line, what is the syntactic significance of `value'?
> Traditionally, it has fontified with the default face, but recently after
> some (not yet committed) changes in CC Mode, it has started getting
> font-lock-type-face.
>
> I don't understand the file at all, hardly, and can't work out whether
> the old (non-) fontification was correct, or whether the new
> fontification of f-l-type-face is correct. Help would be appreciated.
>
> Just as a matter of interest, in c++-ts-mode a treesit-query-error gets
> thrown. It isn't clear to me whether the file is still valid C++.
It is not valid C++ because it misses quite a few declarations.
The parser has no way of knowing what `value' is unless it can see the
relevant declarations. And even then, in the general case, it is not
possible to really know unless your "parser" is, actually, a C++ front
end. So both c++-mode and c++-ts-mode are out of their breadth here.
IMAO, a reasonable heuristic is to consider it a value unless it is
preceded by `typename'.
next prev parent reply other threads:[~2023-01-19 16:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-19 14:53 Help sought from C++ expert: is this `value' a type or something else (what)? Alan Mackenzie
2023-01-19 14:59 ` Eli Zaretskii
2023-01-19 17:14 ` Difficulty building tree-sitter grammars [was: Help sought from C++ expert: ....] Alan Mackenzie
2023-01-19 17:53 ` Dmitry Gutov
2023-01-19 18:06 ` Eli Zaretskii
2023-01-19 18:16 ` Dmitry Gutov
2023-01-19 17:53 ` Eli Zaretskii
2023-01-19 20:56 ` Alan Mackenzie
2023-01-20 6:44 ` Eli Zaretskii
2023-01-19 15:41 ` Help sought from C++ expert: is this `value' a type or something else (what)? Michael Welsh Duggan
2023-01-21 14:34 ` Alan Mackenzie
2023-01-19 16:22 ` Óscar Fuentes [this message]
2023-01-21 14:59 ` Alan Mackenzie
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