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Re: Bug #25608 and the comment-cache branch
From: |
Stefan Monnier |
Subject: |
Re: Bug #25608 and the comment-cache branch |
Date: |
Thu, 23 Feb 2017 09:48:03 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) |
> Naturally, we'd need to save more information to be able to do
> that. E.g. propertize the end of a complex comment with the position of its
> beginning. Since the first time we go through a buffer is in the forward
> direction, getting that info would be inexpensive.
Actually, back_comment may very well parse backward "the first time",
since it doesn't use any cache (currently).
>> Maybe. Obviously, my syntax-ppss hammer makes me think that such
>> alternate solutions aren't needed: syntax-ppss solves this case without
>> having to try and come out with a clever way to detect which comments
>> are tricky nor how to mark them.
> The alternative tweak I had in mind would be applied somewhere around
> syntax-propertize.
But you still have to decide what info to save and when. I.e. there's
a design problem, with non-trivial tradeoffs.
Using syntax-ppss saves me the trouble.
> Another thing to consider is that we would probably want to fontify the
> contents of all subregions normally, even when inside comments belonging to
> the outer mode. So the primitives used in
> font-lock-fontify-syntactically-region would need to be able to stop at
> those boundaries instead of automatically skipping over.
That's right.
> Just having those hooks won't be enough, we still don't have enough info how
> to syntax-propertize the subregion contents, for instance. So I'm not sure
> what the flexibility of using the functions here would buy us.
Me neither.
Maybe the real issue is that starting from syntax-table +
syntax-propertize + font-lock is a losing proposition, and instead we
should first come up with a completely different design (from scratch)
that would be able to parse and highlight code and to accommodate
multiple major modes. Then we can maybe see if there's a way to evolve
the current design of syntax-table + syntax-propertize + font-lock to
that new design.
Stefan
- Re: Bug #25608 and the comment-cache branch, (continued)
- Re: Bug #25608 and the comment-cache branch, Alan Mackenzie, 2017/02/04
- Re: Bug #25608 and the comment-cache branch, Dmitry Gutov, 2017/02/05
- Re: Bug #25608 and the comment-cache branch, Alan Mackenzie, 2017/02/06
- Re: Bug #25608 and the comment-cache branch, Dmitry Gutov, 2017/02/06
- Re: Bug #25608 and the comment-cache branch, Alan Mackenzie, 2017/02/07
- Re: Bug #25608 and the comment-cache branch, Dmitry Gutov, 2017/02/14
- Re: Bug #25608 and the comment-cache branch, Stefan Monnier, 2017/02/14
- Re: Bug #25608 and the comment-cache branch, Dmitry Gutov, 2017/02/21
- Re: Bug #25608 and the comment-cache branch, Stefan Monnier, 2017/02/21
- Re: Bug #25608 and the comment-cache branch, Dmitry Gutov, 2017/02/23
- Re: Bug #25608 and the comment-cache branch,
Stefan Monnier <=
- Re: Bug #25608 and the comment-cache branch, Tom Tromey, 2017/02/24
- Re: Bug #25608 and the comment-cache branch, Alan Mackenzie, 2017/02/14
- Re: Bug #25608 and the comment-cache branch, Stefan Monnier, 2017/02/16
- Re: Bug #25608 and the comment-cache branch, Alan Mackenzie, 2017/02/18
- Re: Bug #25608 and the comment-cache branch, Stefan Monnier, 2017/02/18
- Re: Bug #25608 and the comment-cache branch, John Wiegley, 2017/02/11
- Re: Bug #25608 and the comment-cache branch, Elias Mårtenson, 2017/02/12
- Re: Bug #25608 and the comment-cache branch, Alan Mackenzie, 2017/02/12
- Re: Bug #25608 and the comment-cache branch, martin rudalics, 2017/02/12
- Re: Bug #25608 and the comment-cache branch, Andreas Röhler, 2017/02/12