From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: Unicode confusables and reordering characters considered harmful Date: Wed, 03 Nov 2021 20:34:47 +0100 Message-ID: <87mtml119k.fsf@igel.home> References: <875ytag0hb.fsf@yahoo.com> <87zgqmd5np.fsf@mat.ucm.es> <83wnlqk3rn.fsf@gnu.org> <72dd5c2a-42c7-b12e-05ed-e93adbd89727@gmail.com> <83ilxajyhw.fsf@gnu.org> <83fssejxf8.fsf@gnu.org> <835ytajsv2.fsf@gnu.org> <11d5fecb44af1d388b7f@heytings.org> <11d5fecb449846dc0851@heytings.org> <875yt932ar.fsf@igel.home> <83cznhghp0.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="9073"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) Cc: gregory@heytings.org, stefan@marxist.se, Stefan Monnier , cpitclaudel@gmail.com, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Nov 03 20:37:30 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 1miM4g-0002C5-3e for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Nov 2021 20:37:30 +0100 Original-Received: from localhost ([::1]:45166 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1miM4e-00023k-86 for ged-emacs-devel@m.gmane-mx.org; Wed, 03 Nov 2021 15:37:28 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48360) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miM2C-0006Ob-IA for emacs-devel@gnu.org; Wed, 03 Nov 2021 15:34:56 -0400 Original-Received: from mail-out.m-online.net ([212.18.0.10]:54011) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1miM2A-0000FR-5V; Wed, 03 Nov 2021 15:34:55 -0400 Original-Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 4Hkxmn1YWQz1s6w3; Wed, 3 Nov 2021 20:34:49 +0100 (CET) Original-Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 4Hkxmn0yfGz1qqkB; Wed, 3 Nov 2021 20:34:49 +0100 (CET) X-Virus-Scanned: amavisd-new at mnet-online.de Original-Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id fQn7i5SSchBs; Wed, 3 Nov 2021 20:34:48 +0100 (CET) X-Auth-Info: kpx9LyIm3OusfNppZNUm32pac1Zts2JvukN9DbqR2fUnvuzT+lChUwsBB8Zh29z+ Original-Received: from igel.home (ppp-46-244-172-4.dynamic.mnet-online.de [46.244.172.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Wed, 3 Nov 2021 20:34:48 +0100 (CET) Original-Received: by igel.home (Postfix, from userid 1000) id 9FCFF2C0CFF; Wed, 3 Nov 2021 20:34:47 +0100 (CET) X-Yow: I'd like some JUNK FOOD... and then I want to be ALONE -- In-Reply-To: <83cznhghp0.fsf@gnu.org> (Eli Zaretskii's message of "Wed, 03 Nov 2021 21:30:51 +0200") Received-SPF: pass client-ip=212.18.0.10; envelope-from=whitebox@nefkom.net; helo=mail-out.m-online.net X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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:278615 Archived-At: On Nov 03 2021, Eli Zaretskii wrote: >> From: Stefan Monnier >> Cc: Gregory Heytings , Eli Zaretskii , >> Stefan Kangas , cpitclaudel@gmail.com, >> emacs-devel@gnu.org >> Date: Wed, 03 Nov 2021 14:47:26 -0400 >> >> >> + (aset buffer-display-table ?‪ [?→]) >> >> + (aset buffer-display-table ?‫ [?←]) >> >> + (aset buffer-display-table ?‭ [?→]) >> >> + (aset buffer-display-table ?‮ [?←]) >> >> + (aset buffer-display-table ?⁦ [?→]) >> >> + (aset buffer-display-table ?⁧ [?←]) >> >> + (aset buffer-display-table ?⁨ [?↓]) >> >> + (aset buffer-display-table ?‬ [?↑]) >> >> + (aset buffer-display-table ?⁩ [?↑]) >> > >> > A perfect example of how legitimate use of these characters can mess up >> > your source. :-) >> >> FWIW, I think the source would be clearer if it used `?\u{CHARNAME}` >> instead of the literal chars. > > Huh? What's unclear in a line like this one: > > (aset buffer-display-table ?‫ [?←]) Can you explain what `?([←?]' means? Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."