From: Drew Adams <drew.adams@oracle.com>
To: Drew Adams <drew.adams@oracle.com>,
Matt Armstrong <matt@rfc20.org>,
Stefan Monnier <monnier@iro.umontreal.ca>
Cc: "gerd.moellmann@gmail.com" <gerd.moellmann@gmail.com>,
"eliz@gnu.org" <eliz@gnu.org>,
"mail@andreas-politz.de" <mail@andreas-politz.de>,
"58342@debbugs.gnu.org" <58342@debbugs.gnu.org>
Subject: bug#58342: 29.0.50; noverlay branch is O(N) for important calls
Date: Sat, 8 Oct 2022 00:27:40 +0000 [thread overview]
Message-ID: <SJ0PR10MB5488D22C8185C8185883543CF35E9@SJ0PR10MB5488.namprd10.prod.outlook.com> (raw)
In-Reply-To: <SJ0PR10MB5488492F4E8E60819364AB2FF35F9@SJ0PR10MB5488.namprd10.prod.outlook.com>
> > Does anybody know of an Emacs package that uses a large number of
> > overlays that span large amounts of the buffer in complex ways?
>
> Sure. zones.el does (especially the version
> I use, which I haven't yet exposed externally).
>
> The point of zones.el is to manipulate arbitrary
> sets of buffer zones, which can be implemented
> as overlays (as one possibility).
>
> They can overlap in any way, as the library is
> a utility that you can use in any way. And you
> can sort zones, unite/coalesce them, etc. It's
> not at all unusual to deal with many overlapping
> zones, e.g., overlays.
>
> Dunno what the "noverlay" branch is. I haven't
> seen any description of it or its purpose,
> despite the many, many emails here and in
> emacs-devel with "noverlay" in the Subject line.
> As a result, those many messages get only an
> uninformed glance from me.
>
> But if the "noverlay" branch is supposed to deal
> with overlays _in general_ in some way, then I'd
> think that the case of many overlapping overlays
> wouldn't necessarily be rare. Why would it be?
>
> You can use an overlay for anything: store any
> information on for buffer zone. An overlay is
> just two buffer positions plus a set of
> properties - any properties. _Super_ general.
As an example just one use of arbitrarily
positioned overlays, you can save narrowings
to a set of zones (which can be overlays), and
later reactivate any of them on demand.
Narrowings can have any limits, of course. The
overlays in a zones set can overlap in arbitrary
ways, like Venn diagrams.
next prev parent reply other threads:[~2022-10-08 0:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-06 23:25 bug#58342: 29.0.50; noverlay branch is O(N) for important calls Matt Armstrong
2022-10-07 1:12 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-07 7:09 ` Eli Zaretskii
2022-10-07 13:36 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-07 13:57 ` Eli Zaretskii
2022-10-07 14:47 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-07 15:23 ` Matt Armstrong
2022-10-07 16:51 ` bug#58361: " Andreas Politz
2022-10-07 18:38 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-07 17:11 ` bug#58342: " Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-07 20:37 ` Matt Armstrong
2022-10-07 21:22 ` Drew Adams
2022-10-08 0:27 ` Drew Adams [this message]
2022-10-07 21:58 ` Dmitry Gutov
2022-10-08 6:20 ` Eli Zaretskii
2022-10-08 13:08 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-08 17:24 ` Drew Adams
2022-10-08 23:08 ` Matt Armstrong
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