From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Dmitry Gutov Newsgroups: gmane.emacs.bugs Subject: bug#56682: feature/improved-locked-narrowing 9dee6df39c: Reworked locked narrowing. 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Tue, 31 Jan 2023 14:25:03 -0800 (PST) Original-Received: from [192.168.0.2] ([46.251.119.176]) by smtp.googlemail.com with ESMTPSA id bh6-20020a05600c3d0600b003daffc2ecdesm20620428wmb.13.2023.01.31.14.25.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 31 Jan 2023 14:25:02 -0800 (PST) Content-Language: en-US In-Reply-To: X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:254548 Archived-At: On 31/01/2023 23:46, Stefan Monnier wrote: >> Speaking of additional slowdowns, though, at least in theory -- both >> syntax-ppss and tree-sitter drop their current parse result when point-min >> changes. > FWIW, `syntax-ppss` keeps 2 caches: one for point-min=1 and one for the > other cases. So narrowing doesn't quite "drop the current parse", it > just temporarily ignores it, but recovers it when we exit the narrowing. Take the scenario for scrolling through a whole file. When the file reaches a certain length, the current scheme is to narrow, linearly, to successive text chunks of size N, and fontify them. And since for every chunk point-min will have a new value, it will have to re-parse the text from the beginning of the chunk. Even if the cache exists already for the whole (unrestricted) buffer. And even if syntax-ppss-max-span is lower than N (which it currently is by default, 20000 vs 500000).