toronto-lisp

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492 discussions

[toronto-lisp] Reminder: TorLisp meeting, Tues Jan 5 @ LinuxCaffe
by Vishvajit Singh 05 Jan '10

05 Jan '10

Looking forward to our first meeting of the New Year.. Toronto Lisp Users Group, January Meeting: Tuesday January 5th, 6pm, at the Linux Caffe Directions: http://tinyurl.com/linuxcafe-lisp-meet Brave the cold and meet your fellow Lispers! http://www.lisptoronto.org/ Best wishes, Vish

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[toronto-lisp] next meeting
by Paul Tarvydas 24 Dec '09

24 Dec '09

The next meeting is on Tuesday, January 5, 2010. Does anyone volunteer to give a talk? If you have suggestions on topics you would like to hear about, please post them - it might inspire someone to give a talk. Possible suggestions: - optimization, writing efficient CL - survey of repositories - specific libraries.

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[toronto-lisp] Lenient structs
by doug＠hcsw.org 02 Dec '09

02 Dec '09

I mentioned "lenient structs" at the meeting today and like I said they are a simple but useful example of read macros. A lenient struct is a class wrapper around a list with a special print-object method that makes it print like a struct. The only (defined) thing you can do with lenient structs is print them back out again. Here's the interesting part about lenient structs with respect to read macros: The with-lenient-struct-reader macro installs a custom reader function in a read-table that, when in effect, will cause read-from-string et al to read #S(...) forms as lenient structs instead of regular structs, overriding the system's structure reader function. Lenient structs are used in antiweb so that an intermediate lisp image process in an antiweb system doesn't need to have the structure in question's defstruct definition in order to read it in, process it (as an atom), store it to a DB, read it back out, and print it out to another process. http://hoytech.com/antiweb/ ;; lenient-struct is so we can read in and print out structs even without a corresponding defstruct (defclass lenient-struct () ((contents :accessor lenient-struct-contents :initform nil :initarg :contents))) (defmethod print-object ((l lenient-struct) (s stream)) (format s "#S~S" (lenient-struct-contents l))) (defmacro! with-lenient-struct-reader (&rest body) `(let ((*readtable* (copy-readtable *readtable*))) (let ((,g!read-handler (lambda (stream sub-char numarg) (declare (ignore sub-char numarg)) (unless (char= #\( (read-char stream)) ;) (error "bad lenient-struct form")) ;( (make-instance 'lenient-struct :contents (read-delimited-list #\) stream t))))) (set-dispatch-macro-character #\# #\s ,g!read-handler) (set-dispatch-macro-character #\# #\S ,g!read-handler) ,@body)))

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[toronto-lisp] My notes of the Toronto Lisp Meeting <2009-12-01 Tue>
by Abram Hindle 02 Dec '09

02 Dec '09

* Lisp meeting <2009-12-01 Tue> - Emacs - Defunkt mode - XONG - Google talk - sawzi - Sawzall - Google and machine learning on large datasets - Interpreting the Data: Parallel Analysis with Sawzall > Title: Extreme Data Mining: Machine Learning in Adwords and Google Product Search > Date: Monday, November 30, 2009 at 5pm. > Location: Institute for Quantum Computing, 475 Wes Graham Way, 2nd Floor (RAC Seminar Room) > Map URL: http://bit.ly/InstQuantumComputing > Admission: Free (Google's mission is to organize the world's information and make it universally available and useful) > This Doc URL: http://bit.ly/ExtremeDataMining - Reader Macros - by doug - builds up lists - frames - read delimited list - security issues with #. - how to ignore errors - potential DOS - http://www.lispworks.com/documentation/lw50/CLHS/Body/f_rd_del.htm - read CL by guy steele, table with each character - the readtable - backquote is code.. - meant to be eval'd - `(print ,a) -> (list print value-of-a) - nested backquote.. uhhhh - Reserve our meeting next time, those android devs are trying to infringe on our turf - Serialization - define a generic - print-method - roll your own - more readermacro stuff - how to deal with transients - #<> can't be deserialized - Possible modules http://www.cl-user.net/asp/libs/bdb http://www.cl-user.net/asp/libs/bknr http://www.cl-user.net/asp/libs/clouchdb http://www.cl-user.net/asp/libs/elephant http://www.cl-user.net/asp/libs/PLOB http://common-lisp.net/project/clouchdb/ http://cl-user.net/asp/libs/cl-store http://common-lisp.net/project/cl-perec/ - why FSFS was used for subversion http://web.mit.edu/ghudson/info/fsfs - Tokyo Cabinet key store http://www.igvita.com/2009/02/13/tokyo-cabinet-beyond-key-value-store/ http://1978th.net/tokyocabinet/ - Couchdb http://couchdb.apache.org/ - More BDB - What if HDDs were as fast as memory - Solid state database speed - denormalized distributed database - Mandelbulb discussion - - LISP Admin - talks - we need a group - what do you want to hear - you can do it yourself too, if you want to learn real quick - Do you have a talk to give - projects? - Early talk announcement - Venue - Early Announcement - Reimplementations or analysis - mailinglist

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[toronto-lisp] Dec 01 Meeting
by Mark Bolusmjak 01 Dec '09

01 Dec '09

Can't make it to tonight's meeting. Got back from vacation yesterday & catching up with work, life, etc. Hope to see you all in January. Cheers. -mark

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[toronto-lisp] meeting Dec. 1
by Paul Tarvydas 01 Dec '09

01 Dec '09

Tomorrow is the monthly meeting at LinuxCafe. Does anyone have a presentation? pt

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[toronto-lisp] CL Books
by David Penton 21 Nov '09

21 Nov '09

At the last meeting I recommended Seibel's Practical Common Lisp. I should qualify that recommendation. I am now augmenting my study by going methodically through Graham's ANSI Common Lisp. Doing the exercises has been invaluable to me. So, I would recommend Graham's book for those who are beginning with CL. However, had I only used Graham's book I may have become bored with the simple examples, since I am not a beginner at programming generally. I also have the books listed below, either in hardcopy or digital form. Should I also consider looking at The Little Schemer and related works? What about Doug Hoyte's book? I recognize that a surfeit of textbooks does not guaranty progress. Rest assured that I am actually programming in CL too. Basic Lisp Techniques (Cooper) Common Lisp An Interactive Approach (Shapiro) Common Lisp A Gentle Approach to Symbolic Computation (Touretzky) On Lisp (Graham) Successful Lisp (Lamkins) Structure and Interpretation of Computer Programs Lisp in Small Pieces (Queinnec) The Art of the Metaobject Protocol (Kiczales et al) - Dave -

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[toronto-lisp] pretty printing
by David Penton 17 Nov '09

17 Nov '09

I am baffled (or dense). I cannot get pprint to do what I think it should in any of openmcl, sbcl, or LW. An example given in the ANSI spec/Hyperspec under *print-pretty* is: (let ((*print-pretty* t)) (progn (write '(let ((a 1) (b 2) (c 3)) (+ a b c))) nil)) >> (LET ((A 1) >> (B 2) >> (C 3)) >> (+ A B C)) => NIL I don't get any indentation when I type that example into any of the CL implementations listed above. The example just gets printed on one line of output, no indentation. Am I supposed to do some additional thing to get the output shown? - Dave -

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[toronto-lisp] Request for advice on learning CLOS and MOP (mostly MOP)
by David Penton 16 Nov '09

16 Nov '09

I have been working my way through Seibel's Practical Common Lisp. In one of the chapters (ch.24) Seibel illustrates keeping track of the inherited slots of a class by tucking the information away in a symbol plist. This immediately made me wonder why he did not use something built in to the object system to query a class about itself. Thus I came to investigate MOP stuff, which I believe does provide for the functionality needed in Seibel's example. (I used MOP fns CLASS-SLOTS and CLASS-DIRECT-SLOTS to do the job.) I am considering ordering the book The Art of the MetaObject Protocol by Kiczales et al. However, I wonder if that is really the book I want. I am not so much interested in how it is all implemented as I am in learning about fairly pragmatic reflection functionality. Is anyone familiar with this book? Is it mostly about implementing CLOS? Is there a better resource for learning to use MOP functionality at a basic level? thx - Dave -

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[toronto-lisp] OT: clojure -> DLL hell -> help needed
by Paul Tarvydas 12 Nov '09

12 Nov '09

After playing around with clojure, I found that one of my purchased apps no longer works. The vendor is clueless, so I'm going to have to suss this out myself. The error message is exactly like the one in this post: http://www.eclipsezone.com/eclipse/forums/t94058.html but I don't understand what they're talking about (I obviously don't understand the Java nor Eclipse environments) nor how to solve the problem. If anyone can help, email me directly (unless you think the rest of the mailing list would be interested :-). Thanks. pt

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