From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: what means "intervals". Date: Mon, 08 Mar 2021 23:21:08 -0500 Message-ID: References: <5131bd90-1182-1917-3a2e-dce3d236fc9f@protonmail.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="4247"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:bRSOiWPysDegJovlSjtXxFuNYoY= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Mar 09 05:21:58 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lJTsc-00010Z-1P for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 09 Mar 2021 05:21:58 +0100 Original-Received: from localhost ([::1]:60512 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lJTsb-0000wg-1d for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 08 Mar 2021 23:21:57 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34528) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lJTrx-0000v7-CT for help-gnu-emacs@gnu.org; Mon, 08 Mar 2021 23:21:17 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:40082) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lJTrw-000142-0q for help-gnu-emacs@gnu.org; Mon, 08 Mar 2021 23:21:17 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lJTrs-0000Dh-Pj for help-gnu-emacs@gnu.org; Tue, 09 Mar 2021 05:21:12 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:128369 Archived-At: > I read this section as saying that some editors support adding > attributes to text by first defining a range of positions and then > specifying what properties that range of positions should have. Emacs, > on the other hand, works differently, and does not use the concept of a > distinct "interval" object to describe the attributes of text in the buffer. My take on it is that back during Emacs-19 development, there were discussions about what kind of functionality to add, where Lucid ended up going with "extents" whereas the official Emacs tree ended up going with text-properties (Lucid's "extents" are similar to Emacs's "overlays"), and this chapter was basically written as a justification of the choice of text properties over the choice of extents. This was back during the "great Emacs schism". Stefan