From: Alan Mackenzie <acm@muc.de>
To: Dmitry Gutov <dgutov@yandex.ru>
Cc: 18826@debbugs.gnu.org
Subject: bug#18826: 24.3.94; c++-mode bad indentation after programmatic insert with locally changed syntax table
Date: 25 Oct 2014 19:34:41 -0000 [thread overview]
Message-ID: <20141025193441.10278.qmail@mail.muc.de> (raw)
In-Reply-To: <mailman.12024.1414247237.1147.bug-gnu-emacs@gnu.org>
Hello, Dmitry.
In article <mailman.12024.1414247237.1147.bug-gnu-emacs@gnu.org> you wrote:
> I think the following should be harmless. Why does it result in broken
> indentation?
Why do you think it should be harmless?
> 1. Open in c++-mode buffer with following contents:
> int main(int argc, char** argv) {
> fgets(0, 1, 2);
> }
> 2. Add an empty line after the semicolon, move cursor there, and
> evaluate this:
> (with-syntax-table (make-char-table 'syntax-table nil)
> (modify-syntax-entry ?\( "(")
> (modify-syntax-entry ?\) ")")
> (modify-syntax-entry ?< "(")
> (modify-syntax-entry ?> ")")
> (insert "fgets(0, 1, 2)"))
> 3. Press `;', see the indentation of the current line change, and
> include (erroneously) two extra spaces:
> int main(int argc, char** argv) {
> fgets(0, 1, 2);
> fgets(0, 1, 2);
> }
If you go to the semicolon at the end of line 2 and do C-u C-x = you'll
see that that character has these text-properties:
c-in-sws t
c-is-sws t
fontified t
. The c-in-sws and c-is-sws indicate that the semicolon has been
recognised and marked as syntactic whitespace. The second line thus gets
parsed as "statement-cont", i.e. a continued statement, so it gets
indented an extra level.
If you cripple C++ Mode by substituting a wrong syntax table, you
shouldn't be too surprised when things go "wrong". This seems like one of
these "well, don't do that, then" bugs.
Question: why do you want to play around with the syntax table in this
manner? What are you trying to achieve?
> Originally: https://github.com/company-mode/company-mode/issues/212
> In GNU Emacs 24.3.94.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
> of 2014-10-06 on axl
> Repository revision: 117555 sdl.web@gmail.com-20141005005838-oyl694hqhu2d3632
> Windowing system distributor `The X.Org Foundation', version 11.0.11501000
> System Description: Ubuntu 14.04.1 LTS
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2014-10-25 19:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-25 14:25 bug#18826: 24.3.94; c++-mode bad indentation after programmatic insert with locally changed syntax table Dmitry Gutov
[not found] ` <mailman.12024.1414247237.1147.bug-gnu-emacs@gnu.org>
2014-10-25 19:34 ` Alan Mackenzie [this message]
2014-10-25 22:45 ` Dmitry Gutov
[not found] ` <mailman.12048.1414277182.1147.bug-gnu-emacs@gnu.org>
2014-10-25 23:24 ` Alan Mackenzie
2014-10-26 15:09 ` Dmitry Gutov
2014-10-26 17:07 ` Stefan Monnier
2014-10-25 23:25 ` Stefan Monnier
[not found] ` <jwv61f7ohq0.fsf-monnier+emacsbugs@gnu.org>
2014-10-26 14:56 ` Dmitry Gutov
2014-10-26 14:56 ` Dmitry Gutov
2014-10-26 17:03 ` Stefan Monnier
[not found] ` <mailman.12080.1414336227.1147.bug-gnu-emacs@gnu.org>
2014-10-26 17:38 ` Alan Mackenzie
2014-10-27 1:06 ` Dmitry Gutov
2014-10-27 8:53 ` Alan Mackenzie
2014-10-27 10:21 ` Dmitry Gutov
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