Squeak-dev September 2007

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150 participants
157 discussions

[ANN] LatexMorph
by Simon Guest 29 Sep '07

29 Sep '07

Hello Squeak Hackers, I've made a LatexMorph, which uses Latex and Ghostscript to format Latex commands and display the output on screen. The reason I did this was to get beautiful mathematical formulae in Squeak, but it enables you to do any Latex formatting, not just maths. The Latex output is anti-aliased, courtesy of Ghostscript, and can be used with a transparent or solid background, borders, and stuff. It uses OSProcess to do its business, so you'll need that installed first. And of course, you need to install Latex and Ghostscript on your system. On Unix, Latex and Ghostscript run invisibly in the background. However, on Windows, I'm interested in any suggestions to make the console window not appear when the batch file is run in the background. I'm thinking this needs a change to Win32ProcessPlugin, since there's possibly a flag that can be passed to CreateProcess(). Who knows? In this respect, the Unix version is much nicer. A screenshot here: http://www.tesujimath.org/squeak/LatexMorph/ Get the LatexMorph from SqueakMap. Works in 3.10 and 3.9, and also in 3.8 if you get this bugfix: http://bugs.squeak.org/view.php?id=6701 I learnt a lot about Squeak from doing this. I am beginning to suspect that Squeak is a bit like my wife. I love her dearly, and am very glad we got together, but from time to time and in various ways, she drives me nuts. Happy hacking! cheers, Simon

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Article on Seaside :)
by stephane ducasse 29 Sep '07

29 Sep '07

http://www.computer.org/portal/site/software/

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How to implement a Proxy
by Alejandro Martínez 29 Sep '07

29 Sep '07

I was thinking about implementing a Proxy but instead the usual way which I believe is subclassing from ProtoObject, I subclassed from Object a ProxyObject with an iVar called encapsulatedObject, and then write ProxyObject >>doesNotUnderstand: aMessage ^aMessage sendTo: self encapsulatedObject Then for every message I need to intercept, I write: ProxyObject >>at: index put: value ^self doesNotUnderstand: (Message selector: #at:put: arguments: (Array with: index with: value)). ProxyObject>>asString ^self doesNotUnderstand: (Message selector: #asString). ProxyObject>>name ^self doesNotUnderstand: (Message selector: #name). .... ok... you get the idea. But I was reading a paper called "Evaluating Message Passing Control Techniques in Smalltalk" from Stéphane Ducasse, and supposed my idea qualified as "minimal object". He wrote: "The right technique to create a minimal object is the following: (1) creation of a subclass of Object, (2) assignment of the superclass link to nil and (3) definition of the minimal behavior by copying the needed methods from Object" But I've implemented it without (2) and doing some message replication mentioned above (currently I have no more than 15 of those kind of messages) it would, at first, bypass the problem described in the "Problems" section: "This leads to the problem of the interpretation by the minimal object of messages that were initially destined for the controlled object" Hope I've understood the right way. However, something still smells bad to me... and that's why I'm writing to the list for some advice or suggestion. The only real problem I've experimented is when the replication of #ifNil: nilBlock takes place, this doesn't seem to work: ProxyObject>>ifNil: nilBlock ^self doesNotUnderstand: (Message selector: #ifNil: argument: nilBlock). (my guess here is there's some optimization thing walking around) So, for those cool guys here, can you tell me if there is a possible drawback or unwanted behavior I'm not seeing? If true in which case would happen? Is this a valid way of implementing a Proxy or there's something I've missing? (I suspect a performance penalty, but I'm not sure about this) I'm using a 3.9 image and VM. Cheers

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CFP: STIC Smalltalk Community Committee
by Brad Fuller 28 Sep '07

28 Sep '07

Y'all see this? http://www.cincomsmalltalk.com/userblogs/sticBlog/blogView?showComments=tru… (this is the above link): At ESUG in Lugano I presented STIC - Smalltalk Industry Council as lobby organization for Smalltalk. At the end of the presentation a strong wish was articulated to give members of the greater Smalltalk community a voice inside STIC. In the last month we discussed about this approach on the board of directors and as a result of this I found today STIC Smalltalk Community Committee according to Article VI of the STIC bylaws. The role of this committee shall be to create communication among the different Smalltalk user groups and other important players including the STIC board. Membership is by appointment through the STIC Executive Director. So please send an e-mail to georg(a)stic.st to express your interest. Members of the STIC Advisory Committee shall be * all STIC board members (they are already appointed) * important players in the Smalltalk World e.g. representatives of Seaside, Squeak, ESUG, Smalltalk X, Dolphin, ... The committee shall have one phone conference per month/quarter and meet at Smalltalk Solutions and ESUG. Georg Heeg STIC - Smalltalk Industry Council Executive Director

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CFP: C5-2008 (Extented deadline)
by Serge Stinckwich 28 Sep '07

28 Sep '07

------------------------------------------------------------------ *** Extended deadline for paper submission to: October 14, 2007 *** ------------------------------------------------------------------ CALL FOR PAPERS The Sixth International Conference on Creating, Connecting and Collaborating through Computing (C5 2008) January 14-16, 2008, Poitiers, France http://www.cm.is.ritsumei.ac.jp/c5-08/ Oraganized by Kyoto University Global COE (Centers of Excellence) Program: Informatics Education and Research Center for Knowledge-Circulating Society European Smalltalk User Group Espace Mendès France Viewpoints Research Institute Impara SCOPE Computers, networks, and other forms of technology are now pervasive in our information-based society. However, most users still function as passive consumers of technology. To evolve into a true knowledge society, it is critical that we transform computer-based human activities to engage users in the active process of creating, connecting, and collaborating together. The C5 conference is for researchers, technology developers, educators, and technology users who are concerned about developing and enabling human-oriented creation, connection, and collaboration processes. C5 is an international forum for presenting ongoing work as well as new work currently under development and for discussing future needs and directions in creative computing and multimedia authoring environments. We welcome equally the submission of technical papers and practitioner/experience reports for paper presentations. In addition, we are adding a workshop track for the third day of the conference and are soliciting proposals for interactive workshops. For the first time hosted in Europe, this conference builds on the successes and high standards held by previous C5 conferences : 2003-2005, 2007 in Kyoto (Japan), 2006 in Berkeley (USA). TOPICS OF INTEREST Topics of interest include but not limited to - Development and applications of collaboration tools and environments - User collaboration using 3D, multimedia, and animation objects - Technologies for creating educational environments - Computer-Supported Collaborative Learning (CSCL) and Technology-Enabled Learning (TEL) - Computer-Supported Cooperative Work (CSCW), distributed work, and virtual teaming - Hybrid technology activities, such as scientific experiments, instrumentation, robots, and game playing - Development of applications/content for non traditional learning environments, e.g. mentoring, peer-to-peer, "teacherless" environments (in developing countries), low cost and sustainable technologies, e.g., $100 laptop - Applications and tools for education from K-12 through higher education, system design by children, digital library and search environment for children PAPER SUBMISSION GUIDELINES C5 2008 invites submissions of long papers in the following categories: - Theoretical papers - Case studies, experiments reports - 'Bringing theory into practice or practice into theory' papers focus on building a bridge between practices and theories in the field of C5. Full papers must report original work that has not been previously published. Papers must present reports of significant work in research, development and applications with regards to one or more of the conference topics of interest. All submissions will be reviewed by a distinguished international program committee. A full paper with 8 page limit formatted in two columns and 10 point font should be submitted by the paper submission deadline. The papers are reviewed by the program comittee and authors will be notified about acceptance. Accepted authors have to submit a camera ready version of the full paper with 8 page limit by the camera-ready copy deadline. Papers should follow the formatting instructions provided by 8.5" x 11", Two-Column Format of "IEEE Computer Society Press - Proceedings Author Guidelines" (please refer to INFORMATION FOR AUTHORS in Conference Publishing Service). Submitted papers and camera-ready papers should be sent electronically through our online submission site (will be available soon). The PDF, Postscript and MS-WORD formats are acceptable. PUBLICATION OF THE PROCEEDINGS Preliminary version of the proceedings will be distributed during the conference. The formal version of the proceedings will be published by the IEEE Computer Society and sent to authors after the conference. For each accepted paper, at least one of the authors needs to attend the conference and give presentation, otherwise the paper will not be included in the formal proceedings. IMPORTANT DATES Full paper submission: October 14, 2007 Notification of acceptance: November 21, 2007 Full paper camera-ready copies: December 15, 2007 ORGANIZING COMMITTEE Honorary Co-Chairs Alan Kay, Viewpoints Research Institute, USA Makoto Nagao, National Diet Library, Japan Advisory Chairs Kim Rose, Viewpoints Research Institute, USA Katsumi Tanaka, Kyoto University, Japan Conference Co-Chairs Benay Dara-Abrams, DALaboratories, USA Serge Stinckwich, GREYC, Universite' de Caen/CNRS, France Program Co-Chairs Rieko Kadobayashi, National Institute of Information and Communications Technology (NICT), Japan Hajime Kita, Kyoto University, Japan Rick McGeer, Hewlett-Packard Company, USA Local Arrangement Chairs Thierry Pasquier, Espace Mendes France, France Jean-Francois Cerisier, University of Poitiers, France Samuel Besson, Espace Mendes France, France Publicity and Publication Chair Hideyuki Takada, Ritsumeikan University, Japan Financial Chair Samuel Besson, Espace Mendes France, France Program Committee Noury Bouraqadi, École des Mines de Douai, France Jean-Francois Cerisier, University of Poitiers, France Yvonne Coady, University of Victoria, Canada Sidney Fels, University of British Columbia, Canada Marc Fiuczynski, Princeton University, USA Robert Hirschfeld, Hasso-Plattner-Institut Potsdam, Germany Tsuneo Jozen, Osaka Electro-Communication University, Japan Ton Kalker, HP Labs, USA Shinichi Konomi, University of Tokyo, Japan Pascal Leroux, Université du Maine, France Julian Lombardi, Duke University, USA Maic Masuch, Otto-von-Guericke-University of Magdeburg, Germany Mark McCahill, Duke University, USA John David Miller, Intel Corporation, USA Shinya Nakagawa, HP Labs, Japan Pierre Nonnon, Laboratoire de robotique pédagogique, Université de Montréal, Canada Yoshiki Ohshima, Viewpoints Research Institute, USA Ian Piumarta, Viewpoints Research Institute, USA David P. Reed, MIT Media Lab/ HP Labs, USA Martha Russell, Stanford University, USA Phil Stenton, HP Labs, UK Kazutoshi Sumiya, University of Hyogo, Japan Shin'ichi Ueshima, Kansai University, Japan

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Re: New mock objects framework
by Denis Kudriashov 28 Sep '07

28 Sep '07

2007/9/19, Robert Krahn <rksm(a)gmx.net>: > > Hello Denis, > > I dipped into your BehaviorMockup package and it seems really powerful. I > like the block notation so that the expected behavior is stated after the > exercised code. This way the tests can be more uniform (Four-Phase Test) and > clearer. > > One thing I didn't found out is how to have the mocks ignore certain > message calls. > E.g. I want this to pass: > [:mock | mock m1; m2] should lenient satisfy: [:mock | mock m1] > > I tried it the 'lenient way' as above but I get a SpecFailed: > WrongMessageSelector. How can one do this? > > Best regards, > Robert > > p.s. > I wrote this mail to the squeak-dev mailing list first but forgot to add > your mail address in the header so I am writing you an extra mail. > Hi Robert. Expression [:mock | mock m1; m2] should lenient satisfy: [:mock | mock m1] > creates and verifies LenientBehaviorSpec. It only defines arbitrary message sends order. If you want mock ignores any message sends you must write something like: [:mock | mock m1; m2] should lenient satisfy: [:mock | mock anyMessage. mock m1] But it is not implemented yet. I think it takes a few hours work.. Possible implementation: - Create subclass MessageSemanticsSpec named like AnyMessageSemanticsSpec - Implement #validate: method like in MessageSemanticsSpec but without some testings for message selector and arguments - Change method BehaviorSpecBuilder>>evaluateBehavior: aMessageSend selector = #anyMessage ifTrue: [ messageSendSpec := MessageSendSpec new. messageSendSpec add: (AnyMessageSemanticsSpec from: aMessageSend). spec add: messageSendSpec. ^MessageSendSpecBuilder on: messageSendSpec] messageSendSpec := MessageSendSpec withMessageSemanticsLike: aMessageSend. spec add: messageSendSpec. ^MessageSendSpecBuilder on: messageSendSpec With that stuff you can write specification for ignoring any message any times: mock anyMessage useArbitrary And use null object (with eating message sends): mock anyMessage useArbitrary willReturn: Null new Of course you can implement some nice helper messages for it. Sorry for my english. Best regards, Denis

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Re: [Squeakland] Importing wav files
by Brad Fuller 28 Sep '07

28 Sep '07

Scott, Will you make it available so we can move it into the main Squeak image? On Thu September 27 2007, Scott Wallace wrote: > Hi, Karl and Pierre-André, > > Thank you both for this work! > > We now have three different bodies of code afoot that address sound > issues -- the recent code from the two of you, and also some not-yet- > published code of our own concerning sound-library management. > > Within the next two weeks, we'll scrutinize all this code, integrate > as appropriate, and put the result out as an etoys2.2 update. > > Meanwhile, further tweaks and further discussions remain most > welcome. Thanks again to all! > > Cheers, > > -- Scott > > On Sep 25, 2007, at 11:18 AM, karl wrote: > > Hi, > > I have just started a kind of unification of the sound stuff and > > made some progress. > > I made a SoundTool (Which I should rename SoundLibraryTool) that > > lists the sounds in the sound library. You can also open a > > WaveEditor on the sounds and you get a tile when you click on the > > sound. > > > > I have made a SoundPlayerMorph that pops up when a wav or aif is > > dropped on Squeak. With SoundPlayerMorph you can get a tile of the > > sound without adding it to the library. You can add the sound to > > the library or edit it in WaveEditor. > > > > There are also other fixes to the sound classes. > > > > A few notes on your post: > > > > FileDialogs are not part of the etoys image any longer. > > MP3 files are quite big and external MP3 files is maybe the best > > solution on the OLPC. > > > > Karl > > > > Dreyfuss Pierre-André (EDU) wrote: > >> Hi, > >> > >> You can donwload this project > >> http://ofset.org:8000/super/uploads/traitementSons.015.pr > >> It contains just a change set adding some feature to the sound > >> recorder. > >> > >> The halo's menu has two new items: > >> Load SoundFile and Remove Sound from Librairy. > >> > >> Load SoundFile open a file browser window and let you see aiff and > >> wave sounds. > >> Sound loaded behave the same as recorded sound. > >> > >> To put it in the sound library just hit the tile button. > >> > >> You can ignore the button install , it will load French > >> translation for menu items and some messages. > >> > >> To get a soundrecorder in English, just throw away the french > >> one, change the language to English and get a new one from object > >> catalog. > >> > >> For another language, just change the language to yours, edit the > >> script install in the World's viewer and run it. It is important > >> to change the language first since translations are added to the > >> current language. > >> For the olpc team: > >> > >> Feel free to add this changes to the OLPC image if you like it. > >> (And add mp3 by the way (if possible )) > >> Regards > >> > >> -------- Message d'origine-------- > >> De: squeakland-bounces(a)squeakland.org de la part de subbukk > >> Date: mar. 25/09/2007 06:12 > >> À: squeakland(a)squeakland.org > >> Objet : Re: [Squeakland] Importing wav files > >> > >> On Saturday 22 September 2007 8:02 pm, Bert Freudenberg wrote: > >>>> And there is no sound library tool which could reference all sounds > >>>> present in the Etoys sound tiles. How should such a tool be > >>>> implemented ? Like a book ? > >>> > >>> Maybe a parts bin with all these little tiles? Or like the object > >>> catalog where we have sorting and filtering options? That would be a > >>> nice contribution. The core developers must focus on fixing bugs and > >>> implement missing support now (it's only one month to First > >>> Deployment), but I for one welcome such improvements from others. > >> > >> Squeak does not have a generic mechanism for browsing non-text > >> collections like sound, video or even projects contained within an > >> image. I like the catalog idea with some extensions. The browser > >> manages a collection of tags each of which represent a collection. > >> Then it could display the tag names in the top pane with a > >> 'more ...' button. A selected collection tag could be iterated in > >> the bottom pane. Collections could register their tags with the > >> catalog browser and allow operations for iterations, icons, tiles, > >> morphs, players, editors etc. > >> > >> The file/directory browser is also a catalog browser except that > >> the collection is generated on the fly (by a file or directory > >> open operation) and transient (i.e. not saved in an image but > >> disposed by close operation). A directory would be tagged > >> collection of Morphs. A mime detector would attempt to match a > >> file into an existing morph (e.g. wav, flv, mpg, .image etc.). > >> > >> Any ideas to get me started? .. Subbu > >> > >> _______________________________________________ > >> Squeakland mailing list > >> Squeakland(a)squeakland.org > >> http://squeakland.org/mailman/listinfo/squeakland > > _______________________________________________ > Squeakland mailing list > Squeakland(a)squeakland.org > http://squeakland.org/mailman/listinfo/squeakland

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OmniBrowser too slow?
by Esteban Lorenzano 28 Sep '07

28 Sep '07

Hi all, I recently changed to OmniBrowser (used to use RefactoringBrowser), and is great stuff, but i found it very slow... Is there others with the same feeling or it's just me? btw, i'm using squeak VM 3.9 on ubuntu feisty Cheers, Esteban -- "Querer es suscitar las paradojas" Camus. El míto de Sísifo.

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To new or not to new
by Alejandro Martínez 28 Sep '07

28 Sep '07

Hello list. I'm searching for the opinion of experienced developers: In which case do you create specialized class message for instantiating an object? I think two factors are fundamental: 1) You want to enforce correcteness of your objects by making sure they are complete, so you "minimize" #new and provide specialized messages for creation. 2) You do not want to enforce anything until real usage experience shows you which messages you must "promote" to the class side. My personal view is 2) would be more humble at first, but since this is a question so dependent of the domain you're implementing and your knowledge about it, I'd like to know which patterns or approaches have you seen or taken through the years. Thanks.

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PR Team Request: Submit this story to Slashdot
by Chris Cunnington 28 Sep '07

28 Sep '07

Please read the press release for the book 'Squeak By Example', and submit the story to Slashdot. http://www.squeak.org/PressRoom/NewSmalltalkBookNowAvailableSqueakbyExample/ http://slashdot.org/submit.pl YOU MUST MENTION SQUEAK'S A PART OF THE OLPC. We need to hook into the current wind of G1G1 news spreading throughout the media. Q: On the contrary, that is who you wanted to be: someone who was less headstrong in his youth, less impulsive, less like me. The downside is as follows: the Jean-Luc Picard who you wanted to be, the one who did NOT fight the Nausicaans, had quite a different career from the one you remember. That Jean-Luc Picard never had a brush with death; he never came face-to-face with his own mortality; he never realized how fragile life is, or how important each moment must be. So HIS life never came into focus. He drifted through most of his career, with no plan or agenda... going from one assignment to the next, never seizing the opportunities that presented themselves. He never led the away team on Millica 3 to save the ambassador, or took charge of the Stargazer's bridge when its captain was killed... and no one ever offered HIM a command. He learned to 'play it safe' ... and never got noticed by anybody. Chris Cunnington PR Team leader

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