From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Philip Kaludercic Newsgroups: gmane.emacs.help Subject: Re: macros and macroexpand Date: Tue, 08 Aug 2023 05:57:40 +0000 Message-ID: <87sf8uvzxn.fsf@posteo.net> References: <87wmy7rkxp.fsf@posteo.net> <2cUOv53USl65TgeJJfJlgDmgfzHuXV-aVXANzNsUzvHYoGAwJS2QxesnnSrbkuath2yoan9_Ws8P37dXBRVIFdGgTkFb5rZuG5WyxnqSXv0=@protonmail.com> <87sf8usjia.fsf@posteo.net> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="17082"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Yuri Khan , Heime via Users list for the GNU Emacs text editor To: Heime Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Aug 08 07:58:23 2023 Return-path: Envelope-to: geh-help-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 1qTFja-0004E7-TF for geh-help-gnu-emacs@m.gmane-mx.org; 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envelope-from=philipk@posteo.net; helo=mout01.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=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: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:144676 Archived-At: Heime writes: > ------- Original Message ------- > On Tuesday, August 8th, 2023 at 8:08 AM, Philip Kaludercic wrote: > > >> Heime heimeborgia@protonmail.com writes: >> >> > Sent with Proton Mail secure email. >> > >> > ------- Original Message ------- >> > On Tuesday, August 8th, 2023 at 2:22 AM, Philip Kaludercic philipk@posteo.net wrote: >> > >> > > Heime heimeborgia@protonmail.com writes: >> > > >> > > > Sent with Proton Mail secure email. >> > > > >> > > > ------- Original Message ------- >> > > > On Monday, August 7th, 2023 at 11:46 PM, Yuri Khan yuri.v.khan@gmail.com wrote: >> > > > >> > > > > On Mon, 7 Aug 2023 at 18:04, Heime heimeborgia@protonmail.com wrote: >> > > > > > >> > > > (defmacro adder (mopi mopj) >> > > > `(+ ,(cl-second mopi) ,(cl-third mopj))) >> > > > >> > > > (princ (pp-to-string '(adder (* 3 5) (* 5 7)) )) >> > > >> > > ^ >> > > don't do this >> > > >> > > If you quote an expression, it won't be evaluated or macro-expanded any >> > > further. You can sort-of think of a macro like a kind of inline >> > > function call. The evaluation would go along these lines: >> > > >> > > (princ (pp-to-string (adder (* 3 5) (* 5 7)))) >> > > >> > > will be transformed into this at macro-expansion time, and evaluation >> > > would do this: >> > > >> > > (princ (pp-to-string (+ (cl-second '(* 3 5)) (cl-third '(* 5 7))))) >> > > (princ (pp-to-string (+ 3 7))) >> > > (princ (pp-to-string 10)) >> > > (princ "10\n") >> > > "10\n" >> > >> > What I want to do is print the code made by adder of its final expansion code. >> > Rather than the last evaluation of 10, I want to print (+ 3 7). >> > >> > Can my print command be modified in such a way that the message shows (+ 3 7) ? >> > IT seems that I would need to use macroexpand-all, to get to the final unevaluated >> > sexp. >> >> >> You can modify your macro, to return a quoted expression. >> >> (defmacro adder (mopi mopj) >> `'(+ ,(cl-second mopi) ,(cl-third mopj))) >> ^ >> note this > > That means that you do not evaluate the sexp. I see this more of a hack > to be able to print the sexp as elisp code, rather than the way a macro > will be coded for practical use. Am I right ? > > What I want to have is a function that is able to print the end sexp result > produced by a practically implemented macro, without evaluating the expression. In that case, if I understand you correctly (a concrete example might be useful), macroexpand-all is the right approach. >> This is synonymous with >> >> (defmacro adder (mopi mopj) >> (list 'quote (list '+ (cl-second mopi) (cl-third mopj)))) >> >> which makes sense, if you keep in mind that the result of evaluating the >> macro is what replaces the macro expression in the syntax tree. >> >> > > > I would not do >> > > > >> > > > (princ (pp-to-string (macroexpand '(adder (* 3 5) (* 5 7))) ))