GNU bug report logs - #58979
treesitter-regression with json-mode

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Message #18 received at 58979-done <at> debbugs.gnu.org (full text, mbox):

From: Yuan Fu <casouri <at> gmail.com>
To: 58979-done <at> debbugs.gnu.org
Subject: Re: bug#58979: treesitter-regression with json-mode
Date: Sat, 7 Jan 2023 15:10:14 -0800

Yuan Fu <casouri <at> gmail.com> writes:

> Stefan Kangas <stefankangas <at> gmail.com> writes:
>
>> Johann Höchtl <johann.hoechtl <at> gmail.com> writes:
>>
>>> When I open a large json file (about 3_000_000 lines, about 72Mb,
>>> pretty-printed) Emacs 29.0.50 opens the file just fine in
>>> `js-json-mode` and when using regexp-based font locking, it works
>>> well.
>>>
>>> When I force this buffer into javascript-mode, Emacs hangs. Memory
>>> consumption as reported by Windows task manager "dances" around 2Gb,
>>> yet even after waiting for three minutes, Emacs doesn't get responsive
>>> any more.
>>>
>>> I consider this an unfortunately regression as recent commits to Emacs
>>> 29 (long lines patches) actually makes working with such large files
>>> with long lines absolutely pleasant, yet as it seems the interaction
>>> with tree-sitter destroys this gains.
>>
>> Copying in Yuan Fu.
>
> Again, sorry for the delay, I just saw this report :-)
>
> Since your previous report is actually about emacs-tree-sitter, I think
> this one is too?
>
> Anyway, since tree-sitter is merged into master now, if you rebuild
> master and turn on json-ts-mode, you should be in tree-sitter backed
> JSON mode. I’d give that a try and see if works fine.
>
> Thanks,
> Yuan

Closing this report since I think there’s nothing to do. Feel free to
reopen.

Yuan

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