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Re: CC Mode -> Tree sitter challenge

From: Theodor Thornhill
Subject: Re: CC Mode -> Tree sitter challenge
Date: Sat, 05 Nov 2022 08:56:52 +0100

On 5 November 2022 00:10:06 CET, Yuan Fu <casouri@gmail.com> wrote:
>> On Nov 4, 2022, at 1:34 PM, Theodor Thornhill <theo@thornhill.no> wrote:
>> Hi Eli and others!
>> So you challenged me to add some more modes that are supported in CC
>> Mode, but not using CC Mode.  I finally got some free hours, so here's
>> my first follow-up to your "show me the code".
>> In this repo[0] you will find support for the following modes:
>> - javascript  (this is already in tree-sitter branch - but adding
>>  without cc mode here)
>> - c
>> - c++
>> - java
>> - css
>> - JSON
>> - TypeScript (left out, as it is in tree-sitter branch already)
>> So - some notes:
>> 1. This is still very early, but I wanted to put it out there so that
>> others more knowledgeable than me could chime in on some of the
>> languages. C++ in particular is a language I don't code in, and is
>> notoriously complex.
>> 2. I've focused mostly on indentation and font locking.  Indentation is
>> using xdisp code style and the gnu style in general.
>> 3. There's some support for navigation
>> 4. I'll make Imenu, which-func and other goodies later.  I want it to be
>> usable first.
>I learnt this from João: you don’t need to write a dedicated which-func 
>function, it by default uses data from Imenu.

Nice! I'll check it out.
>> 5. Most other CC mode features such as electric-foo and whitespace
>> cleanup should be possible to do with constructs outside of cc mode.
>Didn’t know cc-mode has white-space cleaning, I’ve always used ws-butler. 

It has some hungry delete and similar stuff

>> When scrolling through xdisp with this variant of C support it is
>> noticeably faster on my system.  However, I'd like some guidance on how
>> to provide some benchmarks to prove my guess.  Loading said file and
>> immediately going to EOB is instant, but in CC Mode takes a little less
>> than a second.
>I’ve done benchmarks, and tree-sitter is indeed much faster, you can probably 
>find them in the archive. Speaking of archive, how does you guys find old 
>messages in the archive? The search feature on the official archive webpage is 

Yeah, i tried too, hehe.

>> @Stefan, you mentioned that filling could be extracted from cc
>> mode. Could you point me either to what/where to look for/at, so that I
>> can make such an attempt?
>I’ll add that it might be a good idea to take out the whole comment, insert 
>them into a temp buffer, fill it with c-fill-paragraph or whatever, then go 
>back and replace the whole comment in the original buffer. Cc-mode’s filling 
>does a lot of invisible insertion and edits in-place, and IIRC it caused 
>problems with eglot before.

Yeah, i was hoping that tree-sitter could do that, but I only tried briefly. 
Seems most of the (comment) nodes contain the comment prefix along with the 
commented text. Would be nice to access the text without comment prefix, but I 
guess we can code or way out of that.

Btw, Yuan - could you tweak indent-region to that it doesn't insert spaces in 
empty lines? It creates a lot of whitespace changes now :)


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