alexandria-devel October 2009

alexandria-devel@common-lisp.net

9 participants
9 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."

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[alexandria-devel] Lost earmuff in tests.lisp
by Peter Graves 11 Mar '10

11 Mar '10

diff -rN -u old-alexandria/tests.lisp new-alexandria/tests.lisp --- old-alexandria/tests.lisp 2009-10-07 03:51:00.000000000 -0700 +++ new-alexandria/tests.lisp 2009-10-07 03:51:01.000000000 -0700 @@ -7,7 +7,7 @@ (in-package :alexandria-tests) -(defun run-tests (&key ((:compiled *compile-tests))) +(defun run-tests (&key ((:compiled *compile-tests*))) (do-tests)) ;;;; Arrays

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[alexandria-devel] eval-always, defun-always, etc...
by Attila Lendvai 03 Dec '09

03 Dec '09

dear list, i know that this is a subject that has strong feelings attached to, but with recent developments in XCVB the need for (eval-when (:compile-toplevel :load-toplevel :execute) ...) has rose, and seeing numerous eval-when noise in the code is potentially annoying. related material: a) relevant part of XCVB docs: http://common-lisp.net/project/xcvb/doc/README.html#compile-time-side-effec… b) "XCVB patch for Alexandria" thread on alexandria-devel c) blog entry from Nikodemus at http://random-state.net/log/3387124996.html (broken currently, google cache below) http://209.85.129.132/search?q=cache:dmgWWKN8vFMJ:random-state.net/log/3387… ============= c) makes it clear that Nikodemus doesn't like eval-always, and i'm sure many other lispers are on the same opinion. for the argument that it does not introduce a new abstraction, i can point to COND, which is the same as an ugly IF ladder, still most people prefer COND when there are many legs of that if, because in that case COND is much less noisy. no new abstraction, only a syntactic sugar, but it's much easier for the eye. a) has a detailed description why often a full (:compile-toplevel :load-toplevel :execute) is necessary, and it'll be even more so as XCVB gets used more and more. so, i'd suggest to take some action: I) add an eval-always to alexandria-devel II) add a defun-always to alexandria-devel avoid the entire need for a wrapper III) ? my vote goes for II), which is kinda in sync with c) too. suggestions? opinions? -- attila

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[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))

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[alexandria-devel] conjoin bug fix
by Kilian Sprotte 02 Nov '09

02 Nov '09

Hi, I stumbled (probably due to some macro-expansion) over the following degenerate case of conjoin: (funcall (conjoin #'zerop) 0) It fails with NIL is not a function. I propose the changes below (also attached as a darcs patch). Cheers, Kilian Thu Oct 15 16:42:45 CEST 2009 Kilian Sprotte <kilian.sprotte(a)gmail.com> * conjoin bug fix for single predicate argument diff -rN old-alexandria/functions.lisp new-alexandria/functions.lisp 40,49c40,51 < (lambda (&rest arguments) < (and (apply predicate arguments) < ;; Cannot simply use CL:EVERY because we want to return the < ;; non-NIL value of the last predicate if all succeed. < (do ((tail (cdr more-predicates) (cdr tail)) < (head (car more-predicates) (car tail))) < ((not tail) < (apply head arguments)) < (unless (apply head arguments) < (return nil)))))) --- > (if (null more-predicates) > predicate > (lambda (&rest arguments) > (and (apply predicate arguments) > ;; Cannot simply use CL:EVERY because we want to return the > ;; non-NIL value of the last predicate if all succeed. > (do ((tail (cdr more-predicates) (cdr tail)) > (head (car more-predicates) (car tail))) > ((not tail) > (apply head arguments)) > (unless (apply head arguments) > (return nil))))))) diff -rN old-alexandria/tests.lisp new-alexandria/tests.lisp 359a360,365 > (deftest conjoin.2 > (let ((conjunction (conjoin #'zerop))) > (list (funcall conjunction 0) > (funcall conjunction 1))) > (t nil)) > -- Kilian Sprotte 10405 Berlin

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Re: [alexandria-devel] [Sbcl-devel] How abour top-level setf = REPL-lexical variables?
by Faré 21 Oct '09

21 Oct '09

2009/10/21 Stas Boukarev <stassats(a)gmail.com>: > "Scott L. Burson" <Scott(a)sympoiesis.com> writes: > >> Historically and throughout most of the CL and pre-CL world -- at least, the MIT and MIT-influenced pole thereof -- the >> practice has been, on a top-level interpreted SETQ of a previously unseen variable, to set the symbol-value of the variable >> and do nothing else -- specifically, not to declare the variable special. MacLisp and ZetaLisp (Lisp Machine Lisp) did >> this, and many important implementations still do: Allegro, LispWorks, the MCL family(*), CLISP, the KCL family(*). (Don't >> know about Lucid or Corman; nor InterLisp, Spice Lisp, or the other pre-CL implementations.) >> >> (*) I am reasonably certain of these. OpenMCL 1.1 and a recent ECL both do, by experiment. >> >> AFAIK it was CMUCL that broke from this practice; and AFAIK it is only the CMUCL family that declares the variable globally >> special, or indeed does anything other than just set the symbol-value. > CMUCL indeed does declare it special, but not SBCL. > (progn (setq fooo 10) (sb-cltl2:variable-information 'fooo)) > => NIL, NIL, NIL There you go for a portable, standard-conformant solution to your problem. (defpackage lexicals) (defmacro deflexical (name &optional value doc) (let ((special (intern (format nil "~W" name) :lexicals))) `(progn (defvar ,special ,@(when value `(,value)) ,@(when doc `(,doc))) (define-symbol-macro ,name ,special)))) Should probably be added to alexandria or some such. (Thanks to Nikodemus or whoever suggested that idea, long ago.) [ François-René ÐVB Rideau | Reflection&Cybernethics | http://fare.tunes.org ] Backwards compatible -- If it's not backwards it's not compatible -- Greg Newton <gregnewton(a)netscape.net>

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[alexandria-devel] XCVB patch for Alexandria
by Faré 16 Oct '09

16 Oct '09

Here's what I need to get Alexandria to compile under XCVB. Is it a problem getting this merged upstream? [ François-René ÐVB Rideau | Reflection&Cybernethics | http://fare.tunes.org ] "I believe that sex is one of the most beautiful, natural, wholesome things that money can buy." -- Steve Martin

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[alexandria-devel] inline
by Faré 09 Oct '09

09 Oct '09

To compile alexandria with the latest CCL, I had to move sequence-of-length-p near the top of sequences.lisp (just below the declaim) least the local (declare (inline ...)) of it would cause CCL to bork, complaining that you're trying to inline a function that hasn't been defined yet. I believe that CCL is justified in complaining and that alexandria upstream should be modified similarly. [ François-René ÐVB Rideau | Reflection&Cybernethics | http://fare.tunes.org ] Down to Gehenna or up to the Throne, He travels the fastest who travels alone. -- Rudyard Kipling

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[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.

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alexandria-devel October 2009