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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: emacs-tree-sitter and Emacs
Date: Thu, 02 Apr 2020 18:15:41 +0300
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> From: Michael Welsh Duggan <mwd@md5i.com>
> Cc: Stephen Leake <stephen_leake@stephe-leake.org>,  emacs-devel@gnu.org
> Date: Thu, 02 Apr 2020 10:27:23 -0400
> 
> > But why do you need that initial full parse in the first place?  Is
> > parsing parts of the buffer so much harder?
> 
> I would think that you at least need to parse everything displayed and
> everything before what is displayed.  (You need all prior context.  What
> if someone opened a comment on line 1 and hasn't closed it, for
> example?)

Each buffer always knows which part of it remains unchanged.  When
fontification is invoked, it should start from that place.  So there's
no need to parse _all_ prior context.