Re: emacs-tree-sitter and Emacs

[Stephen Leake <stephen_leake@stephe-leake.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: 조성빈 <pcr910303@icloud.com>
>> Date: Fri, 3 Apr 2020 04:39:08 +0900
>> Cc: Michael Welsh Duggan <mwd@cert.org>, mwd@md5i.com,
>>  stephen_leake@stephe-leake.org, Emacs-devel@gnu.org
>> 
>> > Yes, with one correction: ideally, it should be unnecessary to start
>> > from point-min (which could be a long way away).  Most languages
>> > should do well enough with starting from the beginning of the
>> > outermost function or class that affects the displayed text.
>> 
>> AFAIU, determining that starting point is a non-trivial task, and if
>> Emacs wants to present the user an exact representation, the text
>> from point-min is still needed: just a hypothetical case would be
>> having a file with all code commented out.
>
> The decision whether there's a need to go to the beginning should be
> made by the parser, not by the infrastructure that invokes it.  If the
> parser needs access to earlier parts of the buffer, it should do that;
> but the fontification infrastructure should not force it to do that.

Yes. wisi provides wisi-parse-expand-region to do just that; it
dispatches on the parser.

-- 
-- Stephe