From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Newsgroups: gmane.emacs.bugs Subject: bug#50136: 28.0.50; A problem with rx-let expansion Date: Fri, 20 Aug 2021 20:45:41 +0200 Message-ID: References: <878s0wcj3j.fsf@web.de> <87y28whw1b.fsf@web.de> Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.21\)) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="5707"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 50136@debbugs.gnu.org, monnier@iro.umontreal.ca To: Michael Heerdegen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Aug 20 20:46:15 2021 Return-path: Envelope-to: geb-bug-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 1mH9Wx-0001Hm-Jo for geb-bug-gnu-emacs@m.gmane-mx.org; 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envelope-from=mattiase@acm.org; helo=mail33c50.megamailservers.eu X-Spam_score_int: -11 X-Spam_score: -1.2 X-Spam_bar: - X-Spam_report: (-1.2 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:212302 Archived-At: 20 aug. 2021 kl. 19.21 skrev Michael Heerdegen = : > I guess it's not very useful for the current mechanism. With a > macro-like thing, the expansion would just not use the value if it's = nil. The > expander would check whether the argument was provided. Yes. It was (and is) a trade-off between the simpler "template-like" = semantics currently used and the programmatic "execute code" semantics = of Lisp macros. The idea was that the simpler semantics would be simpler = and sufficient for most uses, and `eval` forms could always be employed = in other cases. I'm still fretting over having made the wrong call, and that at least I = should have omitted parametrised rx definitions until better understood. If you just have one optional argument, try &rest -- at least its = default-case semantics are crystal clear (no arguments inserted). = Obviously, you could also use separate rx macros for different parameter = lists: (rx-let ((delimited (grp delim) (seq delim (group-n grp (* (not delim)) = delim))) (double-quoted (grp) (delimited grp ?\"))) etc.