From: Yuan Fu <casouri@gmail.com>
To: Theodor Thornhill <theo@thornhill.no>
Cc: emacs-devel <emacs-devel@gnu.org>,
Stefan Monnier <monnier@iro.umontreal.ca>
Subject: Re: Tree-sitter indentation for js-mode & cc-mode
Date: Fri, 28 Oct 2022 18:05:29 -0700 [thread overview]
Message-ID: <EC0B7F2C-D990-474A-8289-5AC8755B9239@gmail.com> (raw)
In-Reply-To: <87wn8jd8zp.fsf@thornhill.no>
> On Oct 28, 2022, at 12:49 PM, Theodor Thornhill <theo@thornhill.no> wrote:
>
>
>>>
>>
>> Ok, I’m fairly certain this is due to tree-sitter reparsing after we
>> indenting each line: treesit-buffer-root-node asks for the root node
>> of the parser, which triggers a reparse, because last indent modified
>> the buffer. We are basically reparsing as many time as there are lines
>> in the buffer.
>>
>> Indenting a similarly sized buffer where all indent are good is much
>> faster, because there is no reparse due to change to the buffer.
>
> Yeah, that's what I was seeing as well. I think this is correct.
>>
>> Tree-sitter indent should add an implementation for indent-for-region
>> function which precomputes indent for each line and indent lines in
>> batch. That ought to fix it. Added to TODO :-)
>
> Hehe, sorry!
Now done. Tree-sitter’s indentation is now slightly faster than cc-mode’s. There are certainly still room for improvement, around 70% time are spent in evaluating each indentation rules. In the future we could introduce a preprocessor for indentation rules like the one for font-lock rules which can pro-compile the rules’s higher order functions. And maybe we can optimize the way we layout the rules slightly.
Yuan
next prev parent reply other threads:[~2022-10-29 1:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-27 1:43 Tree-sitter indentation for js-mode & cc-mode Yuan Fu
2022-10-27 9:11 ` Theodor Thornhill
2022-10-27 9:28 ` Theodor Thornhill
2022-10-27 9:58 ` Theodor Thornhill
2022-10-27 15:21 ` Yuan Fu
2022-10-27 18:36 ` Theodor Thornhill
2022-10-28 8:15 ` Yuan Fu
2022-10-28 8:59 ` Theodor Thornhill
2022-10-28 9:10 ` Theodor Thornhill
2022-10-28 19:43 ` Yuan Fu
2022-10-28 19:49 ` Theodor Thornhill
2022-10-29 1:05 ` Yuan Fu [this message]
2022-10-29 5:53 ` Eli Zaretskii
2022-10-29 6:54 ` Yuan Fu
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