Please take me off the list Thanks
On Thu, Sep 25, 2014 at 12:00 PM, <[email protected]> wrote: > Send users mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.racket-lang.org/users/listinfo > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of users digest..." > > > [Racket Users list: > http://lists.racket-lang.org/users ] > > > Today's Topics: > > 1. Unquoting a variable without unquoting its contents? (J Arcane) > 2. Re: macro question (Jay McCarthy) > 3. Re: macro question (Alejandro Zamora) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 25 Sep 2014 16:52:47 +0300 > From: J Arcane <[email protected]> > To: Racket Users <[email protected]> > Subject: [racket] Unquoting a variable without unquoting its > contents? > Message-ID: > <CA+HVF0Ddf_WybAgJAAnJBvYeVoYMXhcN=4kp4yf1_v-a9ts...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > http://try-racket.org continues to splutter to life, but there's still > something of a glaring error in that it doesn't really like list or quote > at all. > > AlexKnauth has narrowed the problem down here: > https://github.com/jarcane/try-racket/issues/4#issuecomment-56751603 > > It seems that unquoting a variable does funny things to the variable's > contents when they contain a bare quoted list or symbol, so we get weird > results and errors. Quotes get lost, and then the eval finds itself looking > at mangled forms. > > The best I can think of to do is maybe make a simple macro rather than > using quasiquote? Any ideas? > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.racket-lang.org/users/archive/attachments/20140925/e97f0d3f/attachment-0001.html> > > ------------------------------ > > Message: 2 > Date: Thu, 25 Sep 2014 10:17:49 -0400 > From: Jay McCarthy <[email protected]> > To: Alejandro Zamora <[email protected]> > Cc: Racket Users <[email protected]> > Subject: Re: [racket] macro question > Message-ID: > <cajybdakr7sxa55rrizofinregedzyt7v4d+qrd0f_g1ca4j...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > I won't answer the question about R5RS, but in Racket you can do this > fairly succinctly: > > #lang racket/base > (require (for-syntax racket/base > racket/syntax)) > > (define-syntax (vars stx) > (syntax-case stx () > [(_ id count val) > (with-syntax > ([(id_i ...) > (for/list ([i (in-range 1 (add1 (syntax->datum #'count)))]) > (format-id #'id "~a~a" #'id i))]) > (syntax/loc stx > (begin (define id_i val) > ...)))])) > > (vars id 5 null) > > (vector id1 id2 id3 id4 id5) > > 2014-09-24 22:35 GMT-04:00 Alejandro Zamora <[email protected]>: >> Hi Racket people: >> I have a (maybe too simple) question: >> How I create one macro like this (but using define-macro & >> R5RS language only)?: >> >> (vars sym var-cant val-of-vars) >> >> Example: >> (vars id 5 null) -> (prog (define id1 null) >> (define id2 null) >> (define id3 null) >> (define id4 null) >> (define id5 null)) >> >> -- >> Nunca digas nunca, di mejor: gracias, permiso, disculpe. >> >> Este mensaje le ha llegado mediante el servicio de correo electronico que >> ofrece Infomed para respaldar el cumplimiento de las misiones del Sistema >> Nacional de Salud. La persona que envia este correo asume el compromiso de >> usar el servicio a tales fines y cumplir con las regulaciones establecidas >> >> Infomed: http://www.sld.cu/ >> >> ____________________ >> Racket Users list: >> http://lists.racket-lang.org/users > > > > -- > Jay McCarthy > http://jeapostrophe.github.io > > "Wherefore, be not weary in well-doing, > for ye are laying the foundation of a great work. > And out of small things proceedeth that which is great." > - D&C 64:33 > > > > ------------------------------ > > Message: 3 > Date: Thu, 25 Sep 2014 10:49:15 -0400 > From: Alejandro Zamora <[email protected]> > To: Jay McCarthy <[email protected]> > Cc: Racket Users <[email protected]> > Subject: Re: [racket] macro question > Message-ID: <20140925104915.59291dc0@alejandro-H61H2-CM> > Content-Type: text/plain; charset=UTF-8 > > Thanks Jay!! > nice solution!! > I'm asking for define-macro & R5RS because I'm trying to use one > R5RS Embedded Scheme Interpreter on Python that have only define-macro > construction for make macros and I want to use it. > > greetings! > > El Thu, 25 Sep 2014 10:17:49 -0400 > Jay McCarthy <[email protected]> escribi?: >> I won't answer the question about R5RS, but in Racket you can do this >> fairly succinctly: >> >> #lang racket/base >> (require (for-syntax racket/base >> racket/syntax)) >> >> (define-syntax (vars stx) >> (syntax-case stx () >> [(_ id count val) >> (with-syntax >> ([(id_i ...) >> (for/list ([i (in-range 1 (add1 (syntax->datum #'count)))]) >> (format-id #'id "~a~a" #'id i))]) >> (syntax/loc stx >> (begin (define id_i val) >> ...)))])) >> >> (vars id 5 null) >> >> (vector id1 id2 id3 id4 id5) >> >> 2014-09-24 22:35 GMT-04:00 Alejandro Zamora <[email protected]>: >> > Hi Racket people: >> > I have a (maybe too simple) question: >> > How I create one macro like this (but using define-macro & >> > R5RS language only)?: >> > >> > (vars sym var-cant val-of-vars) >> > >> > Example: >> > (vars id 5 null) -> (prog (define id1 null) >> > (define id2 null) >> > (define id3 null) >> > (define id4 null) >> > (define id5 null)) >> > >> > -- >> > Nunca digas nunca, di mejor: gracias, permiso, disculpe. >> > >> > Este mensaje le ha llegado mediante el servicio de correo >> > electronico que ofrece Infomed para respaldar el cumplimiento de >> > las misiones del Sistema Nacional de Salud. La persona que envia >> > este correo asume el compromiso de usar el servicio a tales fines y >> > cumplir con las regulaciones establecidas >> > >> > Infomed: http://www.sld.cu/ >> > >> > ____________________ >> > Racket Users list: >> > http://lists.racket-lang.org/users >> >> >> > > > -- > Nunca digas nunca, di mejor: gracias, permiso, disculpe. > > Este mensaje le ha llegado mediante el servicio de correo electronico que > ofrece Infomed para respaldar el cumplimiento de las misiones del Sistema > Nacional de Salud. La persona que envia este correo asume el compromiso de > usar el servicio a tales fines y cumplir con las regulaciones establecidas > > Infomed: http://www.sld.cu/ > > > > > End of users Digest, Vol 109, Issue 56 > ************************************** ____________________ Racket Users list: http://lists.racket-lang.org/users
