bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

[Denis Zubarev]

Steps to reproduce:
1. emacs -Q
2. M-x find-file /tmp/t.py
3. paste to the buffer

def premain():
    pa|ss
def main():
    pass

where | is cursor position for further steps

4. M-x python-ts-mode
5. M-x eval-expression (treesit-defun-at-point)
treesit-defun-at-point returns nil, but I expect that it will return
a node for `premain`.
If you move the cursor to the beginning of the word `pass` and try again
it will return node for `premain` function.

If you eval `(treesit--things-around (point) treesit-defun-type-regexp)`,
it returns  `(nil #<treesit-node function_definition ...> nil)`
It seems that when cursor is not on the beginning of the node, treesit
erroneously finds next sibling. 
It prevents finding parent node correctly (premain function in this case).
I managed to fix the problem by replacing 
`(cursor (or (nth 0 result) (nth 1 result) node)` with ~(cursor node)~ - here 
https://github.com/emacs-mirror/emacs/blob/12d1f33ceb37a2d0399af7e4054024c60a465ab8/lisp/treesit.el#L2383
But I'm sure it is not the proper fix.


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.33, cairo version 1.16.0) of 2023-11-07 built on NUC-here
Repository revision: a1abb6a85e6605c256595b8d7b885018e5421c28
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.3 LTS

Configured using:
 'configure --with-modules --with-native-compilation=aot
 --with-imagemagick --with-json --with-tree-sitter --with-xft'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2
M17N_FLT MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP
SOUND THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM XINPUT2
XPM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: ru_RU.UTF-8
  value of $LC_NUMERIC: ru_RU.UTF-8
  value of $LC_TIME: ru_RU.UTF-8
  value of $LANG: en_US.UTF-8
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  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
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bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

[Yuan Fu]

> On Nov 7, 2023, at 8:16 AM, Denis Zubarev <dvzubarev@yandex.ru> wrote:
> 
> 
> Steps to reproduce:
> 1. emacs -Q
> 2. M-x find-file /tmp/t.py
> 3. paste to the buffer
> 
> def premain():
>    pa|ss
> def main():
>    pass
> 
> where | is cursor position for further steps
> 
> 4. M-x python-ts-mode
> 5. M-x eval-expression (treesit-defun-at-point)
> treesit-defun-at-point returns nil, but I expect that it will return
> a node for `premain`.
> If you move the cursor to the beginning of the word `pass` and try again
> it will return node for `premain` function.
> 
> If you eval `(treesit--things-around (point) treesit-defun-type-regexp)`,
> it returns  `(nil #<treesit-node function_definition ...> nil)`
> It seems that when cursor is not on the beginning of the node, treesit
> erroneously finds next sibling. 
> It prevents finding parent node correctly (premain function in this case).
> I managed to fix the problem by replacing 
> `(cursor (or (nth 0 result) (nth 1 result) node)` with ~(cursor node)~ - here 
> https://github.com/emacs-mirror/emacs/blob/12d1f33ceb37a2d0399af7e4054024c60a465ab8/lisp/treesit.el#L2383
> But I'm sure it is not the proper fix.

Thank you very much, Denis, your fix is actually the proper fix! But the problem is more complicated. I didn’t clearly define the (prev next parent) returned by treesit--things-around—maybe parent must enclose the prev and next node, and if there are prev and next node beyond the smallest parent node at point, they are not returned; maybe parent doesn’t have to enclose prev and next node, and we will include prev and next nodes in the return value as long as they exist.

It’s not clear which definition is more correct. I’m leaning towards the first. Maybe both are correct and useful and we should support both, hmm...

Yuan

bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

[Zubarev Dv]

Initially I thought that it is the second definition.  It seems to be more intuitive. But after reading code, I was sure its the first case.

But I actually don't sure that all three "things" are needed at once.
For example,  I think for `thing-at-point` only enclosing parent is needed.
If parent is nil, it may optionally fallback to the next sibling thing.
`treesit--navigate-thing` uses only `parent` and `next` or `prev`.
I was playing with creating evil text objects, based on your awesome
work with "things".
I ended up extracting the second part (;; 2. Find the parent) from `treesit--things-around`.
Since I only need to find enclosing parent and I don't want to pay for
what I don't use.
So it seems no function uses all results from `treesit--things-around`.

Maybe it makes sense to decompose `treesit--things-around` into two
functions:
1. (treesit--enclosing-thing (pos thing)) - returns node or nil if no
enclosing parent
2. (treesit--find-sibling (pos thing dir)) - return sibling node in
specified direction.

BTW, I've found another unexpected behavior on the same code:


1. python-ts-mode

def premain():
    pa|ss
def main():
    pass
2. after
(goto-char (treesit--navigate-thing (point) 1 'end treesit-defun-type-regexp))

def premain():
    pass
def main():
    pass|

cursor in the end of the second function

3. but if you move cursor to the beginning of pass

def premain():
    |pass
def main():
    pass

4.  after
(goto-char (treesit--navigate-thing (point) 1 'end treesit-defun-type-regexp))

def premain():
    pass|
def main():
    pass

This behavior does not affected by the fix proposed in the first message.

bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

[Yuan Fu]

> On Nov 8, 2023, at 12:37 PM, Zubarev Dv <dvzubarev@yandex.ru> wrote:
> 
> Initially I thought that it is the second definition.  It seems to be more intuitive. But after reading code, I was sure its the first case.
> 
> But I actually don't sure that all three "things" are needed at once.
> For example,  I think for `thing-at-point` only enclosing parent is needed.
> If parent is nil, it may optionally fallback to the next sibling thing.
> `treesit--navigate-thing` uses only `parent` and `next` or `prev`.
> I was playing with creating evil text objects, based on your awesome
> work with "things".
> I ended up extracting the second part (;; 2. Find the parent) from `treesit--things-around`.
> Since I only need to find enclosing parent and I don't want to pay for
> what I don't use.
> So it seems no function uses all results from `treesit--things-around`.
> 
> Maybe it makes sense to decompose `treesit--things-around` into two
> functions:
> 1. (treesit--enclosing-thing (pos thing)) - returns node or nil if no
> enclosing parent
> 2. (treesit--find-sibling (pos thing dir)) - return sibling node in
> specified direction.

Makes sense. I think separating into two functions is ok. For treesit--enclosing-thing, we might as well call it treesit--thing-at-point ;-) Tentative plan: retire treesit—things-around, add treesit--enclosing-thing (as --thing-at-point), add treesit--find-sibling (as --sibling-thing), add treesit-node-enclose-p which tests whether a node encloses another node.

> 
> BTW, I've found another unexpected behavior on the same code:
> 
> 
> 1. python-ts-mode
> 
> def premain():
>    pa|ss
> def main():
>    pass
> 2. after
> (goto-char (treesit--navigate-thing (point) 1 'end treesit-defun-type-regexp))
> 
> def premain():
>    pass
> def main():
>    pass|
> 
> cursor in the end of the second function
> 
> 3. but if you move cursor to the beginning of pass
> 
> def premain():
>    |pass
> def main():
>    pass
> 
> 4.  after
> (goto-char (treesit--navigate-thing (point) 1 'end treesit-defun-type-regexp))
> 
> def premain():
>    pass|
> def main():
>    pass
> 
> This behavior does not affected by the fix proposed in the first message.

In the first case, treesit--navigate-thing returns a non-nil NEXT node. And treesit—navigate will prioritize NEXT node over PARENT node (because it assumes PARENT node always encloses NEXT node). Fixing the original problem should fix this too.

Yuan

bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

[Yuan Fu]

> On Nov 9, 2023, at 12:13 AM, Yuan Fu <casouri@gmail.com> wrote:
> 
> 
> 
>> On Nov 8, 2023, at 12:37 PM, Zubarev Dv <dvzubarev@yandex.ru> wrote:
>> 
>> Initially I thought that it is the second definition.  It seems to be more intuitive. But after reading code, I was sure its the first case.
>> 
>> But I actually don't sure that all three "things" are needed at once.
>> For example,  I think for `thing-at-point` only enclosing parent is needed.
>> If parent is nil, it may optionally fallback to the next sibling thing.
>> `treesit--navigate-thing` uses only `parent` and `next` or `prev`.
>> I was playing with creating evil text objects, based on your awesome
>> work with "things".
>> I ended up extracting the second part (;; 2. Find the parent) from `treesit--things-around`.
>> Since I only need to find enclosing parent and I don't want to pay for
>> what I don't use.
>> So it seems no function uses all results from `treesit--things-around`.
>> 
>> Maybe it makes sense to decompose `treesit--things-around` into two
>> functions:
>> 1. (treesit--enclosing-thing (pos thing)) - returns node or nil if no
>> enclosing parent
>> 2. (treesit--find-sibling (pos thing dir)) - return sibling node in
>> specified direction.
> 
> Makes sense. I think separating into two functions is ok. For treesit--enclosing-thing, we might as well call it treesit--thing-at-point ;-) Tentative plan: retire treesit—things-around, add treesit--enclosing-thing (as --thing-at-point), add treesit--find-sibling (as --sibling-thing), add treesit-node-enclose-p which tests whether a node encloses another node.
> 
>> 
>> BTW, I've found another unexpected behavior on the same code:
>> 
>> 
>> 1. python-ts-mode
>> 
>> def premain():
>>   pa|ss
>> def main():
>>   pass
>> 2. after
>> (goto-char (treesit--navigate-thing (point) 1 'end treesit-defun-type-regexp))
>> 
>> def premain():
>>   pass
>> def main():
>>   pass|
>> 
>> cursor in the end of the second function
>> 
>> 3. but if you move cursor to the beginning of pass
>> 
>> def premain():
>>   |pass
>> def main():
>>   pass
>> 
>> 4.  after
>> (goto-char (treesit--navigate-thing (point) 1 'end treesit-defun-type-regexp))
>> 
>> def premain():
>>   pass|
>> def main():
>>   pass
>> 
>> This behavior does not affected by the fix proposed in the first message.
> 
> In the first case, treesit--navigate-thing returns a non-nil NEXT node. And treesit—navigate will prioritize NEXT node over PARENT node (because it assumes PARENT node always encloses NEXT node). Fixing the original problem should fix this too.
> 
> Yuan

I’ve pushed to master four new functions: treesit--thing-prev, treesit--thing-next, treesit--thing-at, treesit-node-enclosed-p. And I updated other functions to use the new functions. Now your original example and the later ones should all work right.

Yuan

bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

[Eli Zaretskii]

> Cc: 66989@debbugs.gnu.org
> From: Yuan Fu <casouri@gmail.com>
> Date: Thu, 9 Nov 2023 21:46:01 -0800
> 
> I’ve pushed to master four new functions: treesit--thing-prev, treesit--thing-next, treesit--thing-at, treesit-node-enclosed-p. And I updated other functions to use the new functions. Now your original example and the later ones should all work right.

Thanks.

Should this bug be closed now?

bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

[Zubarev Dv]

Thank you, It fixed the issues!

bug#66989: 30.0.50; tree-sitter: treesit-defun-at-point wrong behavior in python-ts-mode

[Yuan Fu]

> On Nov 10, 2023, at 2:58 PM, Zubarev Dv <dvzubarev@yandex.ru> wrote:
> 
> Thank you, It fixed the issues!

I’ll close the report, but please feel free to follow up with any comments and suggestions.

Yuan