From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Unicode confusables and reordering characters considered harmful, a simple solution Date: Thu, 04 Nov 2021 15:25:48 +0200 Message-ID: <838ry4f3xf.fsf@gnu.org> References: <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> <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> 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="17952"; mail-complaints-to="usenet@ciao.gmane.io" Cc: cpitclaudel@gmail.com, stefan@marxist.se, yuri.v.khan@gmail.com, db48x@db48x.net, monnier@iro.umontreal.ca, emacs-devel@gnu.org To: Gregory Heytings Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Nov 04 14:27:33 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 1micmD-0004Sc-31 for ged-emacs-devel@m.gmane-mx.org; Thu, 04 Nov 2021 14:27:33 +0100 Original-Received: from localhost ([::1]:47634 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1micmA-00056x-DJ for ged-emacs-devel@m.gmane-mx.org; Thu, 04 Nov 2021 09:27:30 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:50742) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mickZ-0003hk-An for emacs-devel@gnu.org; Thu, 04 Nov 2021 09:25:51 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:41430) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mickX-00081H-IR; Thu, 04 Nov 2021 09:25:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-version:References:Subject:In-Reply-To:To:From: Date; bh=M5yo6x9R1GZF4s2U5lV5BLwDEKQnx8eD05hfOIXoJko=; b=Md3wg7xBTg0XoupNdsgZ 5oirKq5JyyVicKfVTtuspp1zxkOZLMkLvz+6q54D4nenF4yrn+If7DjPRYH/hofn9sOUV5mVMjFoB h9R6CLbHh1iE+ZJVNKfUAisYsxRHQIHHcfM2Y/yFgAswKfpUr9gkCe4KP9g8X95ZNcnQ+6PZLlVWs NXYU3wbOjLJv2RSevMZINX3Az3174eiR8KqqzC763A66MkZJ/gWDac6nOZDCCvLf2EYHJ3fq0KcOv Nzk0/j9fH2Ci+ADVJZCL+02V9SJoC7d8nvo4FrOm4f9f8L8BZg7U+U/jbAQhgMhM4JIl6UDoLJeX1 ngamnTz5hkJU5A==; Original-Received: from [87.69.77.57] (port=1168 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mickX-0001mP-31; Thu, 04 Nov 2021 09:25:49 -0400 In-Reply-To: <7699dbfaff090e4342a3@heytings.org> (message from Gregory Heytings on Thu, 04 Nov 2021 11:34:06 +0000) 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:278680 Archived-At: > Date: Thu, 04 Nov 2021 11:34:06 +0000 > From: Gregory Heytings > cc: cpitclaudel@gmail.com, stefan@marxist.se, emacs-devel@gnu.org, > db48x@db48x.net, monnier@iro.umontreal.ca, yuri.v.khan@gmail.com > > >> From a theoretical point of view, that's correct. From a practical > >> point of view, if these controls characters are only found in 0.01% of > >> the files that are hosted on, say, GitLab, and given that these > >> controls can have a dangerous effect, it is reasonable for an editor to > >> make them stand out. > > > > Since when is it OK to flag characters that are used very rarely? What > > would be the sense of doing that? Should we perhaps flag all the > > Egyptian hieroglyphs for the same reason? > > The answer is above: "given that these controls can have a dangerous > effect". But they don't. Not more than just using RTL characters within LTR text would. Just revisit the example posted by Stefan (which I slightly modified to be more realistic): myfun("שָׁלוֹם" ,"السّلامعليكم"); Which string does this function call pass as the first argument, and which as the second one? > There's no reason to put a traffic sign in the middle of a forest. Exactly. And flagging those characters when they are used legitimately is doing precisely that.