toronto-lisp December 2009

toronto-lisp@common-lisp.net

9 participants
5 discussions

[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 December 2009