Comments on: Python vs Scheme: function parameters (part I) http://4.flowsnake.org/archives/12 A Pythoneer's adventures with Scheme, Clojure and a whole lot more. ^_^ Sat, 22 May 2010 22:09:30 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Hans Nowak http://4.flowsnake.org/archives/12/comment-page-1#comment-11 Hans Nowak Sun, 06 Jan 2008 19:11:27 +0000 http://4.flowsnake.org/archives/12#comment-11 A message was posted in the newsgroup/mailing list today stating that an egg was added for SRFI-89. A message was posted in the newsgroup/mailing list today stating that an egg was added for SRFI-89.

]]> By: Hans Nowak http://4.flowsnake.org/archives/12/comment-page-1#comment-9 Hans Nowak Fri, 04 Jan 2008 17:31:49 +0000 http://4.flowsnake.org/archives/12#comment-9 I think that this kind of optional argument is already supported by Chicken (maybe it's part of a different SRFI, maybe it's something else, I don't know). It doesn't define 'define*' or 'lambda*', but #!optional, #!key and #!rest do support this kind of arguments. (See <a href="/archives/13" rel="nofollow">part II</a> of this post.) Maybe that's why nobody in the Chicken community has bothered to implement SRFI-89 so far. I think that this kind of optional argument is already supported by Chicken (maybe it’s part of a different SRFI, maybe it’s something else, I don’t know). It doesn’t define ‘define*’ or ‘lambda*’, but #!optional, #!key and #!rest do support this kind of arguments. (See part II of this post.) Maybe that’s why nobody in the Chicken community has bothered to implement SRFI-89 so far.

]]> By: Rudolf Olah http://4.flowsnake.org/archives/12/comment-page-1#comment-5 Rudolf Olah Fri, 04 Jan 2008 02:13:59 +0000 http://4.flowsnake.org/archives/12#comment-5 I think all SRFIs include an implementation. At the bottom of SRFI-89 there's some code and it will probably work. Of course you also need SRFI-88 implemented. Fortunately, there's a hack implementation of that at the bottom of the SRFI-88 final report. "The implementation of keyword objects requires changing the reader and the evaluator. Although the changes are expected to be straightforward they are obviously highly system dependent. Here we offer a simplistic `user-level' implementation (a.k.a. kludge) that will work in Scheme implementations that allow colons anywhere in the symbol." So it's possible to get that stuff into your Scheme even if it isn't implemented at the system level. Of course I haven't tried the code so I don't know if it works in Chicken Scheme. Would be awesome if it did though :) I think all SRFIs include an implementation. At the bottom of SRFI-89 there’s some code and it will probably work. Of course you also need SRFI-88 implemented. Fortunately, there’s a hack implementation of that at the bottom of the SRFI-88 final report.

“The implementation of keyword objects requires changing the reader and the evaluator. Although the changes are expected to be straightforward they are obviously highly system dependent. Here we offer a simplistic `user-level’ implementation (a.k.a. kludge) that will work in Scheme implementations that allow colons anywhere in the symbol.”

So it’s possible to get that stuff into your Scheme even if it isn’t implemented at the system level. Of course I haven’t tried the code so I don’t know if it works in Chicken Scheme. Would be awesome if it did though :)

]]> By: Hans Nowak http://4.flowsnake.org/archives/12/comment-page-1#comment-4 Hans Nowak Wed, 02 Jan 2008 21:02:16 +0000 http://4.flowsnake.org/archives/12#comment-4 Thanks, I'll look at it. According to the <a href="http://chicken.wiki.br/The%20User's%20Manual" rel="nofollow">Chicken user manual</a>, SRFI-89 is not in the list of SRFIs supported by Chicken... but I don't know how up-to-date that list is. Thanks, I’ll look at it. According to the Chicken user manual, SRFI-89 is not in the list of SRFIs supported by Chicken… but I don’t know how up-to-date that list is.

]]> By: Rudolf Olah http://4.flowsnake.org/archives/12/comment-page-1#comment-3 Rudolf Olah Wed, 02 Jan 2008 19:12:50 +0000 http://4.flowsnake.org/archives/12#comment-3 Just a quick tip. SRFI-89 (http://srfi.schemers.org/srfi-89/srfi-89.html) contains a specification for optional and named parameters (a.k.a keyword parameters). I'm not sure if Chicken Scheme uses something else or if it even implements SRFI-89. Just a quick tip. SRFI-89 (http://srfi.schemers.org/srfi-89/srfi-89.html) contains a specification for optional and named parameters (a.k.a keyword parameters). I’m not sure if Chicken Scheme uses something else or if it even implements SRFI-89.

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