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.devel Subject: Re: Unicode confusables and reordering characters considered harmful, a simple solution Date: Thu, 04 Nov 2021 15:22:41 -0400 Message-ID: References: <831r3yjqo9.fsf@gnu.org> <83v91aibe7.fsf@gnu.org> <87o872s0wf.fsf_-_@db48x.net> <83lf25gm1j.fsf@gnu.org> <83ee7xgio2.fsf@gnu.org> <87fssdrp54.fsf@db48x.net> <831r3xgfz3.fsf@gnu.org> <87v918qx37.fsf@db48x.net> <83o870fjqg.fsf@gnu.org> <7699dbfaffc44df293f3@heytings.org> <83ee7wfe4p.fsf@gnu.org> <7699dbfaff0348867b72@heytings.org> <83a6ikf9pw.fsf@gnu.org> <7699dbfaff090e4342a3@heytings.org> <838ry4f3xf.fsf@gnu.org> <7699dbfaffce8f3a1f41@heytings.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="15652"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Eli Zaretskii , cpitclaudel@gmail.com, stefan@marxist.se, emacs-devel@gnu.org, db48x@db48x.net, yuri.v.khan@gmail.com To: Gregory Heytings Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Nov 04 20:23:55 2021 Return-path: Envelope-to: ged-emacs-devel@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 1miiL4-0003qa-6U for ged-emacs-devel@m.gmane-mx.org; Thu, 04 Nov 2021 20:23:54 +0100 Original-Received: from localhost ([::1]:50808 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1miiL2-0007wW-Fr for ged-emacs-devel@m.gmane-mx.org; Thu, 04 Nov 2021 15:23:52 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:46292) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miiK5-0007FE-LC for emacs-devel@gnu.org; Thu, 04 Nov 2021 15:22:53 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:2692) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miiK2-0002na-ON; Thu, 04 Nov 2021 15:22:53 -0400 Original-Received: from pmg1.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg1.iro.umontreal.ca (Proxmox) with ESMTP id 992F310012C; Thu, 4 Nov 2021 15:22:48 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg1.iro.umontreal.ca (Proxmox) with ESMTP id 6ABBA10028A; Thu, 4 Nov 2021 15:22:42 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1636053762; bh=rcFX7RZceMqXjDDwvisZF/MF5dSSKHoOnoggPhlrSyg=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=pr8jW/IcusENAa/RpDo61PywUgQq0Wrk6dw1PbQsAUovxUvzaHZRWpQ3Rvd+BdMct 6i6EaYsV8BMkL2sV70xpIVAFDsNzLslBuBv/nWcYPlhtMaIqhAs81rO3v/OIFiF+7j 3QZKZjDHsyDOa9RcU63VKRq/wODJfMmBv6P9DwTOeQkLueDP6wQ+Q1NVaQgMj1Rja/ 8/UkcMTibYEWaXoU0FsSEDgUycUHv6QzKnUwGVxQ9HouAwlB9lqop3NTQSY6VVdlgG lBPsRmbukEuxJmoALORCojZ7QfxdKIN0pmErLIugoJ23hGllSHkRYKUKHu35WXD441 Gs0YRh1tKcJKw== Original-Received: from alfajor (lechon.iro.umontreal.ca [132.204.27.242]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 5242E12097A; Thu, 4 Nov 2021 15:22:42 -0400 (EDT) In-Reply-To: <7699dbfaffce8f3a1f41@heytings.org> (Gregory Heytings's message of "Thu, 04 Nov 2021 14:10:01 +0000") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:278707 Archived-At: >> myfun("=D7=A9=D6=B8=D7=81=D7=9C=D7=95=D6=B9=D7=9D" ,"=D8=A7=D9=84= =D8=B3=D9=91=D9=84=D8=A7=D9=85=D8=B9=D9=84=D9=8A=D9=83=D9=85"); [...] > There is a danger when, because the source code contains invisible control > characters, the programmer sees something on their screen, and the compil= er > sees something completely different. You mean there is a special kind of danger coming from the invisible control characters because they can make code render unexpectedly even though all the rendered chars are "familiar" (e.g. all-ASCII)? That's a good point. Maybe a middle ground could be to call the attention to such overrides when they're used inside a text line where all the chars are of the exact same directionality, but not if the line already contains both strong-LTR and strong-RTL characters. Stefan