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bug#64442: 29.0.92; treesit-beginning-of-defun fails in DEFUN functions
From: |
Eli Zaretskii |
Subject: |
bug#64442: 29.0.92; treesit-beginning-of-defun fails in DEFUN functions in C |
Date: |
Tue, 04 Jul 2023 14:39:55 +0300 |
> From: Yuan Fu <casouri@gmail.com>
> Date: Tue, 4 Jul 2023 01:41:22 -0700
> Cc: 64442@debbugs.gnu.org
>
> The problem with DEFUN’s is that a DEFUN is really made of two nodes in the
> parse tree. One for the DEFUN part, one for the body, and there isn’t a
> parent node that encloses the two.
>
> The defun movement functions are not designed to handle a construct made of
> two adjacent nodes. They can find a node, go to the beginning/end of it; they
> can’t find a node, and go to the end of the next node.
>
> It sounds easy to add some hack to handle it, but really isn’t. Defun
> movement need to support forward/backward to beg/end, that’s four movement
> types;
Why cannot we look for a top-level expression_statement node which is
a call_expression whose function identifier is "DEFUN" and whose
position is between the place where C-M-a was invoked and the place
where it does find a defun?
> on top of that you have nested defun’s.
DEFUN's cannot be nested, so we don't need to consider that.
Thanks.