Re: treesitter local parser: huge slowdown and memory usage in a long file

[Dmitry Gutov <dmitry@gutov.dev>]

On 04/06/2024 07:53, Yuan Fu wrote:
>> Yep, that sounds easier. And the performance should be about the same, even if it'd have a bit extra overhead in those theoretical complex cases.
>>
> Ok, I pushed a commit to master that does just that. I tried with C’s block comment, and php-ts-mode. Everything seems to work fine.
> 
> I also added treesit-primary-parser. This is supposed to be another configuration variable that a major mode should set. I’ve encountered various cases where knowing the primary parser (parser that parses the entire buffer rather than just a subset of it) would be very helpful. Treesit-primary-parser can be auto-guessed if major mode doesn’t set it, so it shouldn’t break anything. I’d love to know yours and Stefan’s thoughts on it.

Thanks Yuan, it's looking good.

The new variable probably deserves a mention in the manual, although if 
the guesser fallback is reliable enough (which it seems to be, given 
that we didn't hear seee reports about that specifically) maybe that's 
not urgent.