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bug#65885: Acknowledgement (29.1.50; wrong behaviour of treesit-beginnin
From: |
Yang Yingchao |
Subject: |
bug#65885: Acknowledgement (29.1.50; wrong behaviour of treesit-beginning-of-defun in c++-ts-mode) |
Date: |
Wed, 13 Sep 2023 08:03:48 +0800 |
User-agent: |
mu4e 1.10.6; emacs 29.1.50 |
>> Date: Tue, 12 Sep 2023 12:41:32 +0800
>> From: Yang Yingchao via "Bug reports for GNU Emacs,
>> the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>>
>> It seams that there is an issue with the behavior of
>> `treesit-beginning-of-defun` function in
>> `c++-ts-mode` when there are static variables present in the source code.
>> For instance, in the
>> provided code snippet, if the cursor is initially placed on the line
>> containing `int b`, and the
>> "C-M-a" is pressed, the cursor is positioned on line 4 instead of line 1
>> where the beginning of
>> the function is located.
>>
>> ,----
>> | void func // c-ts-mode: treesit-beginning-of-defun stops in this
>> line, RIGHT
>> | {
>> | char * msg;
>> | static int a; // c++-ts-mode: treesit-beginning-of-defun stops in this
>> line, WRONG
>> | int b; // PUT CUSOR HERE
>> | }
>> `----
>>
>> it works in c-ts-mode works normally.
>
> If you want c++-ts-mode to work like c-ts-mode, set
> treesit-defun-tactic to 'top-level'. By default, we try to support
> nested defuns in C++, but not in C.
I apologize, but I realized that I have already asked this question before.
However, setting 'treesit-defun-tactic' to 'top-level' could cause other
issues, as seen in the following snippets:
,----
| class Name {
| public:
| Name()
| {
| // cursor here
| }
|
| void func()
| {
| static int a;
| }
|
| };
`----
Suppose the cursor is in line 5, and "C-M-a" is pressed:
- In 'c++-mode', the cursor will be moved to the start of the function
'Name()', which is the expected behavior.
- In 'c++-ts-mode':
- With 'treesit-defun-tactic' set to 'nested', it behaves the same as in
'c++-mode'.
- With 'treesit-defun-tactic' set to 'top-level', the cursor is moved to the
beginning of the class, i.e., line 1.
Is it possible to make 'c++-ts-mode' behave the same as in 'c++-mode'?
Regards.