alexandria-devel June 2009

alexandria-devel@common-lisp.net

8 participants
6 discussions

[alexandria-devel] Review cycle 2: SWITCH, ESCWITCH, and CSWITCH
by Nikodemus Siivola 08 Apr '10

08 Apr '10

macro switch ((object &key test key) &body clauses) "Evaluates first matching clause, returning its values, or evaluates and returns the values of DEFAULT if no keys match." macro eswitch ((object &key test key) &body clauses) "Like SWITCH, but signals an error if no key matches." cswitch ((object &key test key) &body clauses) "Like SWITCH, but signals a continuable error if no key matches."

8 23

[alexandria-devel] cdr assoc (now called alist-get)
by John Fremlin 25 Nov '09

25 Nov '09

For http://common-lisp.net/project/cl-irregsexp/ and in fact for many other projects, it is quite handy to have a way of storing key value pairs in a table that is more lightweight than a hashtable, and that preserves ordering. The obvious way to do it in Lisp is to store a list like '((key0 . value0) (key1 . value1) ...) However in the ANSI standard there is no easy way to implement (setf (gethash key table) value). (cdr (assoc ...)) is sufficient for lookup. To that end there is commonly available in extensions a (setf cdr-assoc). I posted one to the list before but I had managed to mangle it utterly in my last edit of it and it didn't work. I hope that was why you Alexandrians ignored me . . . Anyway, one problem with cdr-assoc is that the order of parameters is apparently non-standard. To alleviate this problem I have come back with a new name, alist-get and also ralist-get (for cdr-rassoc, the (value.key) convention). Feedback very much appreciated! (declaim (inline racons)) (defun racons (key value ralist) (acons value key ralist)) (macrolet ((define-alist-get (name get-pair get-value-from-pair add) `(progn (declaim (inline ,name)) (defun ,name (alist key &key (test 'eql)) (let ((pair (,get-pair key alist :test test))) (values (,get-value-from-pair pair) pair))) (define-setf-expander ,name (place key &key (test ''eql) &environment env) (multiple-value-bind (dummies vals newvals setter getter) (get-setf-expansion place env) (when (cdr newvals) (error "~A cannot store multiple values in one place" ',name)) (with-unique-names (store key-val test-val alist found) (values `(,@dummies ,key-val ,test-val) `(,@vals ,key ,test) (list store) `(let ((,alist ,getter)) (let ((,found (,',get-pair ,key-val ,alist :test ,test-val))) (cond (,found (setf (,',get-value-from-pair ,found) ,store)) (t (let ,newvals (setf ,(first newvals) (,',add ,key ,store ,alist)) ,setter))) ,store)) `(,',name ,getter ,key)))))))) (define-alist-get alist-get assoc cdr acons) (define-alist-get ralist-get rassoc car racons))

3 6

[alexandria-devel] darcs patch: Add #.#+ readtime conditional functions.
by asf＠boinkor.net 02 Oct '09

02 Oct '09

Mon Oct 16 10:00:31 CEST 2006 asf(a)boinkor.net * Add #.#+ readtime conditional functions. * This adds functions that can be used in #+#. readtime conditionals, for example: #+#.(alexandria:read-if (find-package :asdf-install)) :yay #+#.(alexandria:read-if-fbound :install :asdf-install :exportedp t) :yay * included in the patch is a commented-out portion that allows the user to activate a #? read syntax. I'm not sure if that fits into the conservativism constraints.

3 3

[alexandria-devel] curry and rcurry -> papply and rpapply?
by szergling 07 Aug '09

07 Aug '09

Hi Alexandrians, I believe curry and rcurry are the wrong names for the current functions in Alexandria. See the following for example, http://srfi.schemers.org/srfi-26/mail-archive/msg00000.html http://srfi.schemers.org/srfi-26/mail-archive/msg00015.html What about papply or partial-apply? Or maybe p-apply? This way, The reversed version might be called rp-apply. Otherwise reverse-partial-apply? I am aware that this is a common usage/mistake in CL, but Alexandria doesn't have to perpetuate this error. An unfortunate downside is breaking backwards compatibility. I'm not sure what Alexandria's policy is regarding this... I'm happy to send patches if this renaming is agreed upon. Theam Yong Chew

9 17

[alexandria-devel] RPMs available for Fedora 11
by Robert Uhl 19 Jun '09

19 Jun '09

I just wanted to announce that an Alexandria RPM is available at: http://yum.octopodial-chrome.com/11/RPMS/noarch/cl-alexandria-0.0.0-1.fc11.… In the same location there is an octopodial-chrome RPM which will install the signing key for all packages as well as Yum repository configuration information for those wishing to keep up-to-date. -- Robert Uhl <http://public.xdi.org/=ruhl> The CS curriculum really is critical. Learning it would save you from inventing PHP, which would be a huge benefit to mankind. --David Chapman

1 0

[alexandria-devel] curry and rcurry -> papply and rpapply?
by szergling 04 Jun '09

04 Jun '09

Hi Alexandrians, I believe curry and rcurry are the wrong names for the functions in Alexandria. See the following for example, http://srfi.schemers.org/srfi-26/mail-archive/msg00000.html http://srfi.schemers.org/srfi-26/mail-archive/msg00015.html What about papply or partial-apply? Or maybe p-apply? This way, The reversed version might be called rp-apply. Otherwise reverse-partial-apply? I am aware that this is a common usage/mistake in CL, but Alexandria doesn't have to perpetuate this error. An unfortunate downside is breaking backwards compatibility. I'm not sure what Alexandria's policy is regarding this... Theam Yong Chew

1 0

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alexandria-devel June 2009