From: "Andreas Röhler" <andreas.roehler@online.de>
To: Alan Mackenzie <acm@muc.de>
Cc: emacs-devel@gnu.org
Subject: Re: Problems with syntax-ppss: Was [... Apply `comment-depth' text properties when calling `back_comment'.]
Date: Sat, 12 Mar 2016 21:19:54 +0100 [thread overview]
Message-ID: <56E479EA.5010306@online.de> (raw)
In-Reply-To: <20160311120808.GA2888@acm.fritz.box>
On 11.03.2016 13:08, Alan Mackenzie wrote:
> Hello, Andreas.
>
> On Fri, Mar 11, 2016 at 08:27:17AM +0100, Andreas Röhler wrote:
>
>>> Well, given that syntax-ppss is not suitable for fixing back_comment,
>>> the alternatives are not fixing it, substantially amending syntax-ppss,
>>> using my new code, or fixing it some other way. I really think it
>>> should be fixed. You don't want syntax-ppss to be changed. Do you have
>>> an idea for an "other way"?
>> There is neither a need nor a way to fix syntax-ppss : Determining
>> syntax must check from beginning of buffer, as parse-partial-sexp does.
>> parse-partial-sexp is in C, it's fast.
> parse-partial-sexp starts scanning from where you ask it to, optionally
> starting with a parse state returned by a previous invocation. Although
> it's fast, it's not all that fast when repeatedly run over large
> portions of a large buffer. This is what syntax-ppss was intended to
> solve.
>
> The position syntax-ppss notionally starts scanning from is
> indeterminate. Sometimes it's the beginning of buffer, sometimes it's
> the beginning of the visible portion of the buffer, sometimes it's some
> former beginning of visible portion.
>
> Its documentation is confused, too. The entry in the elisp manual says
> "beginning of buffer". The doc string string says "point-min".
>
> I disagree about the need to fix syntax-ppss - medium level functions
> should be rigorous and determinate.
>
>
Needed or not: it's impossible. The idea of a cache WRT to comments
can't work. Every insert may start a new multiline-comment at pos 1. How
a cache will detect that? The results of syntax-ppss are hardly
predictable.
next prev parent reply other threads:[~2016-03-12 20:19 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160308132530.861.91488@vcs.savannah.gnu.org>
[not found] ` <E1adHdj-0000FI-0W@vcs.savannah.gnu.org>
2016-03-08 14:19 ` [Emacs-diffs] comment-cache 223d16f 2/3: Apply `comment-depth' text properties when calling `back_comment' Stefan Monnier
2016-03-08 18:30 ` Alan Mackenzie
2016-03-08 18:42 ` Stefan Monnier
2016-03-08 20:07 ` Alan Mackenzie
2016-03-08 21:22 ` Dmitry Gutov
2016-03-08 21:43 ` Alan Mackenzie
2016-03-09 0:17 ` Stefan Monnier
2016-03-09 1:54 ` Stefan Monnier
2016-03-09 10:49 ` Problems with syntax-ppss: Was [... Apply `comment-depth' text properties when calling `back_comment'.] Alan Mackenzie
2016-03-09 13:11 ` Stefan Monnier
2016-03-09 14:19 ` Alan Mackenzie
2016-03-09 19:16 ` Stefan Monnier
2016-03-09 19:22 ` Clément Pit--Claudel
2016-03-09 19:37 ` Alan Mackenzie
2016-03-09 21:40 ` Stefan Monnier
2016-03-10 13:01 ` Alan Mackenzie
2016-03-10 14:52 ` Stefan Monnier
2016-03-10 15:29 ` Alan Mackenzie
2016-03-10 16:45 ` Stefan Monnier
2016-03-10 17:25 ` Alan Mackenzie
2016-03-10 17:34 ` Stefan Monnier
2016-03-10 19:08 ` Alan Mackenzie
2016-03-10 23:10 ` Stefan Monnier
2016-03-11 12:50 ` Stefan Monnier
2016-03-11 20:48 ` Alan Mackenzie
2016-03-11 22:35 ` Stefan Monnier
2016-03-11 23:08 ` Alan Mackenzie
2016-03-11 23:09 ` Clément Pit--Claudel
2016-03-11 23:31 ` Stefan Monnier
2016-03-10 23:31 ` John Wiegley
2016-03-11 2:08 ` Clément Pit--Claudel
2016-03-11 3:08 ` Stefan Monnier
2016-03-11 7:27 ` Andreas Röhler
2016-03-11 12:08 ` Alan Mackenzie
2016-03-11 12:30 ` Dmitry Gutov
2016-03-11 13:04 ` Alan Mackenzie
2016-03-11 20:21 ` Dmitry Gutov
2016-03-12 20:19 ` Andreas Röhler [this message]
2016-03-12 20:38 ` Dmitry Gutov
2016-03-12 20:45 ` Alan Mackenzie
2016-03-13 14:56 ` Andreas Röhler
2016-03-10 13:41 ` Stefan Monnier
2016-03-09 17:06 ` How do you check if the current point is in a comment or a string? (Was Re: Problems with syntax-ppss: Was [... Apply `comment-depth' text properties when calling `back_comment'.]) Clément Pit--Claudel
2016-03-09 17:24 ` Kaushal Modi
2016-03-09 17:56 ` Clément Pit--Claudel
2016-03-09 19:19 ` Kaushal Modi
2016-03-09 19:34 ` Clément Pit--Claudel
2016-03-10 14:28 ` Stefan Monnier
2016-03-10 15:03 ` Clément Pit--Claudel
2016-03-10 15:20 ` Stefan Monnier
2016-03-10 17:21 ` Clément Pit--Claudel
2016-03-12 20:45 ` Andreas Röhler
2016-03-12 20:53 ` Clément Pit--Claudel
2016-03-09 16:37 ` [Emacs-diffs] comment-cache 223d16f 2/3: Apply `comment-depth' text properties when calling `back_comment' Richard Stallman
2016-03-09 17:06 ` Dmitry Gutov
2016-03-10 21:20 ` Richard Stallman
2016-03-11 0:26 ` Dmitry Gutov
2016-03-11 12:22 ` Alan Mackenzie
2016-03-11 12:52 ` Stefan Monnier
2016-03-11 16:20 ` Drew Adams
2016-03-09 17:48 ` Alan Mackenzie
2016-03-09 19:58 ` martin rudalics
2016-03-09 20:36 ` Eli Zaretskii
2016-03-09 20:53 ` John Wiegley
2016-03-13 9:30 ` Daniel Colascione
2016-03-13 15:28 ` Stefan Monnier
2016-03-13 16:24 ` Eli Zaretskii
2016-03-13 16:27 ` Daniel Colascione
2016-03-13 17:19 ` Eli Zaretskii
2016-03-14 1:13 ` Stefan Monnier
2016-03-14 16:10 ` Eli Zaretskii
2016-03-11 18:27 ` Alan Mackenzie
2016-03-12 17:08 ` Alan Mackenzie
2016-03-12 18:10 ` martin rudalics
2016-03-12 18:22 ` Paul Eggert
2016-03-12 18:46 ` martin rudalics
2016-03-12 19:36 ` Alan Mackenzie
2016-03-13 9:26 ` martin rudalics
2016-03-13 11:52 ` Alan Mackenzie
2016-03-13 12:08 ` martin rudalics
2016-03-13 12:49 ` Alan Mackenzie
2016-03-13 13:32 ` martin rudalics
2016-03-13 17:59 ` Eli Zaretskii
2016-03-13 20:09 ` martin rudalics
2016-03-14 1:15 ` Paul Eggert
2016-03-14 7:42 ` martin rudalics
2016-03-14 11:22 ` Alan Mackenzie
2016-03-14 19:41 ` martin rudalics
2016-03-14 20:58 ` Alan Mackenzie
2016-03-14 16:15 ` Eli Zaretskii
2016-03-14 19:41 ` martin rudalics
2016-03-14 17:00 ` Paul Eggert
2016-03-14 19:41 ` martin rudalics
2016-03-14 16:09 ` Eli Zaretskii
2016-03-13 18:00 ` Eli Zaretskii
2016-03-13 18:41 ` Alan Mackenzie
2016-03-12 20:56 ` Dmitry Gutov
2016-03-12 21:29 ` Clément Pit--Claudel
2016-03-12 21:59 ` Dmitry Gutov
2016-03-12 21:58 ` Alan Mackenzie
2016-03-12 22:16 ` Dmitry Gutov
2016-03-13 17:59 ` Alan Mackenzie
2016-03-13 22:49 ` Stefan Monnier
2016-03-14 12:51 ` Alan Mackenzie
2016-03-15 3:14 ` Stefan Monnier
2016-03-14 1:13 ` Dmitry Gutov
2016-03-14 1:30 ` Stefan Monnier
2016-03-14 1:45 ` Dmitry Gutov
2016-03-14 2:18 ` Stefan Monnier
2016-03-14 12:23 ` Alan Mackenzie
2016-03-14 16:15 ` Dmitry Gutov
2016-03-14 17:29 ` Alan Mackenzie
2016-03-14 17:52 ` Dmitry Gutov
2016-03-14 18:46 ` Alan Mackenzie
2016-03-14 19:33 ` Dmitry Gutov
2016-03-14 21:20 ` Alan Mackenzie
2016-03-15 3:10 ` Stefan Monnier
2016-03-17 0:47 ` Dmitry Gutov
2016-03-17 18:47 ` Alan Mackenzie
2016-03-18 1:24 ` Dmitry Gutov
2016-03-10 21:20 ` Richard Stallman
2016-03-10 22:24 ` Alan Mackenzie
2016-03-12 1:53 ` Richard Stallman
2016-03-12 3:28 ` Stefan Monnier
2016-03-12 19:28 ` Richard Stallman
2016-03-09 17:51 ` Clément Pit--Claudel
2016-03-10 21:20 ` Richard Stallman
2016-03-10 21:38 ` Clément Pit--Claudel
2016-03-12 1:53 ` Richard Stallman
2016-03-10 7:14 ` Andreas Röhler
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=56E479EA.5010306@online.de \
--to=andreas.roehler@online.de \
--cc=acm@muc.de \
--cc=emacs-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).