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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Johann Höchtl <johann.hoechtl <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: treesitter-regression with json-mode
Date: Wed, 2 Nov 2022 17:16:08 +0100

[Message part 1 (text/plain, inline)]

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.

[Message part 2 (text/html, inline)]

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