GNU bug report logs - #72525
31.0.50; Forward sexp inconsistency issue c++-ts-mode

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ergus <spacibba <at> aol.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Forward sexp inconsistency issue c++-ts-mode
Date: Thu, 08 Aug 2024 16:45:42 +0200

Hi:

Using this code:

```
int main()
{
  abort(); /* 1 */
  abort(); /* 1 */
}
```

There is an inconsistency in the c++-ts-mode behavior of `forward-sexp`.

When there is a comment at the end of the line, if I do `mark-sexp`
(C-M-SPC) consecutively I get this selected regions:

-----------------------------
1.
abort();

2.
abort(); /* 1 */

3.
abort(); /* 1 */
abort

4.
abort(); /* 1 */
abort()

5.
abort(); /* 1 */
abort();

6.
abort(); /* 1 */
abort(); /* 1 */

-------------------------------



But when there is NOT trailing comment

```
int main()
{
  abort();
  abort();
}
```

-------------------------------
1.
abort();

2.
abort();
abort();
-------------------------------


It looks like in the fist example after 3 the sexp definition is more fine
grained (similar to the previous c++-mode behavior) and it selects
separately:
 the function name,
 the arguments
 the semicolon
 the comment

But if there is no comment at the end, it always considers the complete
line as a sexp (including the ;).

For my use case I would prefer the old behavior because it is consistent
with the current sexp definition in all emacs (with maybe the exception
of python-mode).  Because it is easier to copy function names or
function calls with a few movements.

However, if it is too difficult to reproduce the old behavior; then the
new one may be implemented consistently.

Best,
Ergus



In GNU Emacs 31.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.0) of 2024-08-07 built on RTX
Repository revision: dd93c32c82c65f7c7b26e8c7a8e4fa8425cdbfe0
Repository branch: project
System Description: Arch Linux

Configured using:
 'configure --prefix=/home/ergo/.local/ --with-mailutils --with-pgtk
 --with-modules --with-cairo --with-harfbuzz
 --with-native-compilation=aot
 '--program-transform-name=s/^ctags$/ctags.emacs/''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PGTK
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Important settings:
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Major mode: C++//

Minor modes in effect:
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Load-path shadows:
/mnt/casa/gits/emacs_clones/cuda-mode/cuda-mode hides /home/ergo/.config/emacs/elpa/cuda-mode-20240716.1936/cuda-mode
/mnt/casa/gits/emacs_clones/gtags-mode/gtags-mode hides /home/ergo/.config/emacs/elpa/gtags-mode-1.8/gtags-mode
/home/ergo/.config/emacs/elpa/transient-20240805.1231/transient hides /home/ergo/.local/share/emacs/31.0.50/lisp/transient

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Memory information:
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 (strings 32 50296 12386) (string-bytes 1 1766229) (vectors 16 19239)
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