bug#67990: 30.0.50; tree-sitter: treesit-node-field-name-for-child seems to be broken after recent changes

bug#67990: 30.0.50; tree-sitter: treesit-node-field-name-for-child seems to be broken after recent changes

[Denis Zubarev]

libtree-sitter is compiled from sources (latest version) 

Steps to reproduce:
1. emacs -Q
2. M-x find-file /tmp/t.py
3. Paste there
if (v is not None and #comment
    v > 0):
   pass
4. M-x python-ts-mode
5. M-x treesit-explore-mode
    python

Parse tree:
(module
 (if_statement if
  (parenthesized_expression (
   (boolean_operator
    left: (comparison_operator (identifier) operators: is not operators: is not operators: (none))
    operator: and operator: (comment)
    operator: (comparison_operator (identifier) operators: > operators: (integer)))
   ))
  condition: :
  condition:
   (block
    (pass_statement pass))))


Parse tree from the playground:
module [0, 0] - [4, 0]
  if_statement [0, 0] - [2, 7]
    condition: parenthesized_expression [0, 3] - [1, 10]
      boolean_operator [0, 4] - [1, 9]
        left: comparison_operator [0, 4] - [0, 17]
          identifier [0, 4] - [0, 5]
          none [0, 13] - [0, 17]
        comment [0, 22] - [0, 30]
        right: comparison_operator [1, 4] - [1, 9]
          identifier [1, 4] - [1, 5]
          integer [1, 8] - [1, 9]
    consequence: block [2, 3] - [2, 7]
      pass_statement [2, 3] - [2, 7]


Version from the playground has correctly assigned fields:
parenthesized_expression - condition:, block is labeled as
consequence:, the second comparison_operator - right:

I noticed this regression after 9874561f39e62c1c9fada6c2e013f93d9ea65729.
Quote from this commit "So turns out ts_node_field_name_for_child takes a named node index,"
It seems that was a bug in the libtree-sitter and they fixed it in
https://github.com/tree-sitter/tree-sitter/pull/2104
Unfortunately, there is no release with this fix yet.

I have tested various combinations of libtree-sitter and fix from 9874561f39:
With commit 9874561f39
libtree-sitter v0.20.8 - condition: and consequence: fields are wrongly assigned
libtree-sitter version with the fix* - most fields are broken

When reverting commit 9874561f39
libtree-sitter v0.20.8 - only right: field is wrong (points to the comment node)
libtree-sitter version with the fix* - ok


* tree-sitter version with the fix:
git clone https://github.com/tree-sitter/tree-sitter.git
git checkout 6d1904c221d15d2fcbe0b590ff0a3f96c692429f
It is needed to recompile grammar after changing the libtree-sitter version.



In GNU Emacs 30.0.50 (build 9, x86_64-pc-linux-gnu, GTK+ Version
 3.24.33, cairo version 1.16.0) of 2023-12-23 built on NUC-here
Repository revision: 9c86dd52475e0ad65359bc964fbe0d62b9d3e464
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
  locale-coding-system: utf-8-unix

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bug#67990: 30.0.50; tree-sitter: treesit-node-field-name-for-child seems to be broken after recent changes

[Eli Zaretskii]

> From: Denis Zubarev <dvzubarev@yandex.ru>
> Date: Sat, 23 Dec 2023 17:37:54 +0300
> 
> 
> libtree-sitter is compiled from sources (latest version) 
> 
> Steps to reproduce:
> 1. emacs -Q
> 2. M-x find-file /tmp/t.py
> 3. Paste there
> if (v is not None and #comment
>     v > 0):
>    pass
> 4. M-x python-ts-mode
> 5. M-x treesit-explore-mode
>     python
> 
> Parse tree:
> (module
>  (if_statement if
>   (parenthesized_expression (
>    (boolean_operator
>     left: (comparison_operator (identifier) operators: is not operators: is not operators: (none))
>     operator: and operator: (comment)
>     operator: (comparison_operator (identifier) operators: > operators: (integer)))
>    ))
>   condition: :
>   condition:
>    (block
>     (pass_statement pass))))
> 
> 
> Parse tree from the playground:
> module [0, 0] - [4, 0]
>   if_statement [0, 0] - [2, 7]
>     condition: parenthesized_expression [0, 3] - [1, 10]
>       boolean_operator [0, 4] - [1, 9]
>         left: comparison_operator [0, 4] - [0, 17]
>           identifier [0, 4] - [0, 5]
>           none [0, 13] - [0, 17]
>         comment [0, 22] - [0, 30]
>         right: comparison_operator [1, 4] - [1, 9]
>           identifier [1, 4] - [1, 5]
>           integer [1, 8] - [1, 9]
>     consequence: block [2, 3] - [2, 7]
>       pass_statement [2, 3] - [2, 7]
> 
> 
> Version from the playground has correctly assigned fields:
> parenthesized_expression - condition:, block is labeled as
> consequence:, the second comparison_operator - right:
> 
> I noticed this regression after 9874561f39e62c1c9fada6c2e013f93d9ea65729.
> Quote from this commit "So turns out ts_node_field_name_for_child takes a named node index,"
> It seems that was a bug in the libtree-sitter and they fixed it in
> https://github.com/tree-sitter/tree-sitter/pull/2104
> Unfortunately, there is no release with this fix yet.
> 
> I have tested various combinations of libtree-sitter and fix from 9874561f39:
> With commit 9874561f39
> libtree-sitter v0.20.8 - condition: and consequence: fields are wrongly assigned
> libtree-sitter version with the fix* - most fields are broken
> 
> When reverting commit 9874561f39
> libtree-sitter v0.20.8 - only right: field is wrong (points to the comment node)
> libtree-sitter version with the fix* - ok

Yuan, any comments?

bug#67990: 30.0.50; tree-sitter: treesit-node-field-name-for-child seems to be broken after recent changes

[Yuan Fu]

> On Dec 23, 2023, at 6:37 AM, Denis Zubarev <dvzubarev@yandex.ru> wrote:
> 
> 
> libtree-sitter is compiled from sources (latest version) 
> 
> Steps to reproduce:
> 1. emacs -Q
> 2. M-x find-file /tmp/t.py
> 3. Paste there
> if (v is not None and #comment
>    v > 0):
>   pass
> 4. M-x python-ts-mode
> 5. M-x treesit-explore-mode
>    python
> 
> Parse tree:
> (module
> (if_statement if
>  (parenthesized_expression (
>   (boolean_operator
>    left: (comparison_operator (identifier) operators: is not operators: is not operators: (none))
>    operator: and operator: (comment)
>    operator: (comparison_operator (identifier) operators: > operators: (integer)))
>   ))
>  condition: :
>  condition:
>   (block
>    (pass_statement pass))))
> 
> 
> Parse tree from the playground:
> module [0, 0] - [4, 0]
>  if_statement [0, 0] - [2, 7]
>    condition: parenthesized_expression [0, 3] - [1, 10]
>      boolean_operator [0, 4] - [1, 9]
>        left: comparison_operator [0, 4] - [0, 17]
>          identifier [0, 4] - [0, 5]
>          none [0, 13] - [0, 17]
>        comment [0, 22] - [0, 30]
>        right: comparison_operator [1, 4] - [1, 9]
>          identifier [1, 4] - [1, 5]
>          integer [1, 8] - [1, 9]
>    consequence: block [2, 3] - [2, 7]
>      pass_statement [2, 3] - [2, 7]
> 
> 
> Version from the playground has correctly assigned fields:
> parenthesized_expression - condition:, block is labeled as
> consequence:, the second comparison_operator - right:
> 
> I noticed this regression after 9874561f39e62c1c9fada6c2e013f93d9ea65729.
> Quote from this commit "So turns out ts_node_field_name_for_child takes a named node index,"
> It seems that was a bug in the libtree-sitter and they fixed it in
> https://github.com/tree-sitter/tree-sitter/pull/2104
> Unfortunately, there is no release with this fix yet.
> 
> I have tested various combinations of libtree-sitter and fix from 9874561f39:
> With commit 9874561f39
> libtree-sitter v0.20.8 - condition: and consequence: fields are wrongly assigned
> libtree-sitter version with the fix* - most fields are broken
> 
> When reverting commit 9874561f39
> libtree-sitter v0.20.8 - only right: field is wrong (points to the comment node)
> libtree-sitter version with the fix* - ok
> 
> 
> * tree-sitter version with the fix:
> git clone https://github.com/tree-sitter/tree-sitter.git
> git checkout 6d1904c221d15d2fcbe0b590ff0a3f96c692429f
> It is needed to recompile grammar after changing the libtree-sitter version.

Thank you very much! So it seems that we should revert that commit, and point to libtree-sitter if people come to us reporting errors. I reverted that commit on emacs-29.

Yuan

bug#67990: 30.0.50; tree-sitter: treesit-node-field-name-for-child seems to be broken after recent changes

[Eli Zaretskii]

> Cc: 67990@debbugs.gnu.org
> From: Yuan Fu <casouri@gmail.com>
> Date: Fri, 29 Dec 2023 19:54:27 -0800
> 
> 
> 
> > On Dec 23, 2023, at 6:37 AM, Denis Zubarev <dvzubarev@yandex.ru> wrote:
> > 
> > 
> > libtree-sitter is compiled from sources (latest version) 
> > 
> > Steps to reproduce:
> > 1. emacs -Q
> > 2. M-x find-file /tmp/t.py
> > 3. Paste there
> > if (v is not None and #comment
> >    v > 0):
> >   pass
> > 4. M-x python-ts-mode
> > 5. M-x treesit-explore-mode
> >    python
> > 
> > Parse tree:
> > (module
> > (if_statement if
> >  (parenthesized_expression (
> >   (boolean_operator
> >    left: (comparison_operator (identifier) operators: is not operators: is not operators: (none))
> >    operator: and operator: (comment)
> >    operator: (comparison_operator (identifier) operators: > operators: (integer)))
> >   ))
> >  condition: :
> >  condition:
> >   (block
> >    (pass_statement pass))))
> > 
> > 
> > Parse tree from the playground:
> > module [0, 0] - [4, 0]
> >  if_statement [0, 0] - [2, 7]
> >    condition: parenthesized_expression [0, 3] - [1, 10]
> >      boolean_operator [0, 4] - [1, 9]
> >        left: comparison_operator [0, 4] - [0, 17]
> >          identifier [0, 4] - [0, 5]
> >          none [0, 13] - [0, 17]
> >        comment [0, 22] - [0, 30]
> >        right: comparison_operator [1, 4] - [1, 9]
> >          identifier [1, 4] - [1, 5]
> >          integer [1, 8] - [1, 9]
> >    consequence: block [2, 3] - [2, 7]
> >      pass_statement [2, 3] - [2, 7]
> > 
> > 
> > Version from the playground has correctly assigned fields:
> > parenthesized_expression - condition:, block is labeled as
> > consequence:, the second comparison_operator - right:
> > 
> > I noticed this regression after 9874561f39e62c1c9fada6c2e013f93d9ea65729.
> > Quote from this commit "So turns out ts_node_field_name_for_child takes a named node index,"
> > It seems that was a bug in the libtree-sitter and they fixed it in
> > https://github.com/tree-sitter/tree-sitter/pull/2104
> > Unfortunately, there is no release with this fix yet.
> > 
> > I have tested various combinations of libtree-sitter and fix from 9874561f39:
> > With commit 9874561f39
> > libtree-sitter v0.20.8 - condition: and consequence: fields are wrongly assigned
> > libtree-sitter version with the fix* - most fields are broken
> > 
> > When reverting commit 9874561f39
> > libtree-sitter v0.20.8 - only right: field is wrong (points to the comment node)
> > libtree-sitter version with the fix* - ok
> > 
> > 
> > * tree-sitter version with the fix:
> > git clone https://github.com/tree-sitter/tree-sitter.git
> > git checkout 6d1904c221d15d2fcbe0b590ff0a3f96c692429f
> > It is needed to recompile grammar after changing the libtree-sitter version.
> 
> Thank you very much! So it seems that we should revert that commit, and point to libtree-sitter if people come to us reporting errors. I reverted that commit on emacs-29.

Thanks, I'm therefore closing this bug.