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 17:23:58 +0200 Message-ID: References: <878s0wcj3j.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="5930"; 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 17:25:13 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 1mH6OM-0001I5-W6 for geb-bug-gnu-emacs@m.gmane-mx.org; 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envelope-from=mattiase@acm.org; helo=mail70c50.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:212285 Archived-At: 20 aug. 2021 kl. 15.59 skrev Michael Heerdegen = : > (rx-let ((scatter (string) > (regex (mapconcat #'string (string-to-list string) = ".*")))) > (rx (scatter "abc"))) =3D> useless error message Yes, that's an unfortunate consequence of the current substitution = mechanism (validating Stefan's premonitions to some extent). However the syndrome is entirely avoidable and does not make the = facility less powerful. > Personally I would be more happy with a thing called `rx-macrolet' = than > with an extended `rx-let' to support this additional macro-like kind = of > syntax. Noted (in the honest sense)! > AFAIU, the current approach doesn't allow to extend this with an > optional CHARS argument to specify with chars are allowed "in between" > (instead of "any"). The "&optional" keyword makes it barf. That's right. What would be the preferred semantics? For example, what = value would you expect an absent optional parameter to take? `nil` isn't = very useful inside rx forms, so it would only make sense inside embedded = Lisp expressions. > And I can't actually "look" at the arguments to provide a conditional > replacement. All I can do is to use `regex' to eval a constant > expression I specify (at run-time). This seems a quite limiting > approach. Something more macro-like would be appropriate IMO. Actually it's the rx `eval` form that you are looking for if you want = arbitrary compile-time computation. `regexp` and `literal` are = explicitly made for run-time expressions.