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

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Message #8 received at 58979 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Johann Höchtl <johann.hoechtl <at> gmail.com>
Cc: Yuan Fu <casouri <at> gmail.com>, 58979 <at> debbugs.gnu.org
Subject: Re: bug#58979: treesitter-regression with json-mode
Date: Sat, 12 Nov 2022 12:34:03 -0800

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.

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