Squeak-dev May 2007

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150 participants
233 discussions

About NewCompiler double-bar
by nicolas cellier 24 May '07

24 May '07

NewCompiler accepts the double bar binary message as a valid selector #|| This is not ambiguous with an empty literal declaration that always happen before an expression. If i tried this, it works perfectly: ClosureCompiler evaluate: '[:x| ||]'. [] in UndefinedObject>>DoIt {[:t1 | nil]} But fails without the space: ClosureCompiler evaluate: '[:x|||]'. [:xSmaCCParserError: Token not expected ->|||] HUH? Concouring for the most minor bug one ever care of in the world! Nicolas

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Unescape html text
by Brian Murphy-Dye 23 May '07

23 May '07

Is there an existing method that is the opposite of String>>encodeForHTTP, e.g., converting 'a b' into 'a b'? #unescapePercents takes care of converting the percent signs; 'a%26b' unescapePercents => 'a&b' but can't find anything for the "special" escape sequences. Brian.

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RE: Fun with symbol
by Boris Popov 23 May '07

23 May '07

Ditto, 7.5 works just fine. Cheers! -Boris -- +1.604.689.0322 DeepCove Labs Ltd. 4th floor 595 Howe Street Vancouver, Canada V6C 2T5 http://tinyurl.com/r7uw4 boris(a)deepcovelabs.com CONFIDENTIALITY NOTICE This email is intended only for the persons named in the message header. Unless otherwise indicated, it contains information that is private and confidential. If you have received it in error, please notify the sender and delete the entire message including any attachments. Thank you. > -----Original Message----- > From: Dave Stevenson [mailto:dstevenson@cincom.com] > Sent: Wednesday, May 23, 2007 8:35 AM > To: nicolas cellier > Cc: vwnc(a)cs.uiuc.edu > Subject: Re: Fun with symbol > > Works fine in current builds. > > nicolas cellier wrote: > > About some discussion on Squeak-dev... > > Ah, even mature VW is caught sometimes (at leat 7.3.1) > > > > | str | > > str := String new writeStream. > > #'x:y:z' storeOn: str. > > Kernel.Compiler evaluate: str contents readStream > > > > Cheers > > > > > > > > nicolas cellier a écrit : > > > That's what mature means I guess. > > > > > > The last is syntactically correct, and correctly parsed by Squeak. > > > However Squeak result is quite surprising, debug it to believe it. > > > > > > Nicolas > > > > > > > > > > > > PS: forgot this one: > > > Compiler evaluate: '#$'. > > > Not to confuse: > > > Compiler evaluate: '# $'. > > > And: > > > Compiler evaluate: '#$ '. > > > > > > Boris Popov a écrit : > > >> If anyone cares, here's VisualWorks' treatment, > > >> > > >> Compiler evaluate: '#++'. > > >> #++ > > >> > > >> Compiler evaluate: '##'. > > >> #word, binary, keyword, (, or [ expected -># > > >> > > >> Compiler evaluate: '#'. > > >> #word, binary, keyword, (, or [ expected -> > > >> > > >> Compiler evaluate: '# "please" # "print" # "me"'. > > >> # "please" word, binary, keyword, (, or [ expected -># "print" # > "me" > > >> > > >> Compiler evaluate: '##()'. > > >> #word, binary, keyword, (, or [ expected ->#() > > >> > > >> Compiler evaluate: '##)'. > > >> #word, binary, keyword, (, or [ expected ->#) > > >> > > >> Compiler evaluate: '##('. > > >> #word, binary, keyword, (, or [ expected ->#( > > >> > > >> Compiler evaluate: '##(##)'. > > >> #word, binary, keyword, (, or [ expected ->#(##) > > >> > > >> Compiler evaluate: '#1'. > > >> #word, binary, keyword, (, or [ expected ->1 > > >> > > >> Compiler evaluate: '#-1'. > > >> #-Nothing more expected ->1 > > >> > > >> Compiler evaluate: '#--1'. > > >> Unhandled exception: Message not understood: #- > > >> > > >> Cheers! > > >> > > >> -Boris > > >> > > > > > > > > > > > > >

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Re: fullBounds off by one?
by Jerome Peace 23 May '07

23 May '07

Hi Subbu, I tried several variations in a fresh 3dot9 (7067) and could not reproduce the problem. Could you write it up as a mantis report and include the simplist way to reproduce the problem. Yours in curiosity and service, --Jerome Peace *** >fullBounds off by one? > > >subbukk subbukk at gmail.com >Tue May 22 18:47:52 UTC 2007 > >Hi, > >Why is: > (fullBounds x) = (bounds x) >but > (fullBounds y) = (bounds y - 1) > >for aSystemWindow (e.g. Workspace). This is causing a gap along the top in a >snapshot image (see attachment). The problem does not occur for >RectangleMorph. > >Is this a bug? .. Subbu *** ____________________________________________________________________________________Ready for the edge of your seat? Check out tonight's top picks on Yahoo! TV. http://tv.yahoo.com/

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Dynabook hw cost
by mmille10＠comcast.net 23 May '07

23 May '07

As I looked over how Alan Kay had described the Dynabook in 1972 (in "A Personal Computer for Children of All Ages") the thought that was forming in my head was "Hmm... This sounds like my PDA", at least in terms of the hardware configuration (though the PDA is smaller), and the way the owner would interact with the hardware. The "tablet" computers of today (sans physical keyboard) would fit the description more accurately. The only part missing would be the software. When I think about the software characteristics, I think Squeak/eToys matches pretty well with the educational qualities that he described for it. In terms of business and other personal uses, I think that part would need to be developed more to match what he described. It's uncanny. If you take a look at how he described the Dynabook interacting with what was called the ARPANet back then (the internet), and translated it to today's web medium, he was right on in predicting the future. He used some old-fashioned terminology for things, but if you look at the concepts beneath the labels, what he described is what we have now. I especially liked this line. He just got done describing all the different things a Dynabook user could access through the ARPANet, including "stores" and "billboards", and then he says: "One can imagine one of the first programs an owner will write is a filter to eliminate advertising!" Today we call them "pop-up blockers"! :) ---Mark mmille10(a)comcast.net

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Something for the News Team? 'UNCW, School Districts Using "Squeak"'
by Michael Davies 23 May '07

23 May '07

Interesting press release here: http://appserv02.uncw.edu/news/article.asp?ID=2148 I've extracted a one-paragraph summary suitable for posting to news.squeak.org: "Teachers and students in North Carolina will soon be learning to use "Squeak" software to create virtual models that simulate actual science and math-related experiments. A grant-funded partnership between the University of North Carolina Wilmington and the New Hanover, Pender and Brunswick County schools is addressing concerns over students' declining interest in computing by infusing IT skills into the curriculum in grades 7-12. The three-year-long project will work directly with about 75 educators who teach the Science, Technology, Engineering, Mathematics (STEM) curricula and 150 of their students. " By the way, should there be an official 'news' address on the site that such proposed articles could be sent to? Michael

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Spoon progress 2007-05-22: behavior archives
by Craig Latta 23 May '07

23 May '07

Hi-- I've just started following up on an idea I mentioned a while ago, a mechanism for storing and restoring past versions of methods and classes. It effectively replaces the traditional changes and sources files, and is used by the module system to perform module unloading. When a system wants to store a method or class (for example, when it is about to overwrite an old method with a newly-compiled version), it makes a request via remote message to an entirely separate object memory dedicated to archival (which may also perform archival for any number of other systems). Methods, classes, and metadata about them (such as author and source code) are stored as objects. The archival system snapshots itself after every addition (not a big deal since it's relatively small). I think having a real system available to help with version browsing and crash recovery, as opposed to a text file, will be a lot more powerful. Modules use the archival system during loading to keep track of the components they happen to replace (old methods and classes). Each module creates an "antimodule" which, when installed, reverts the system to the way it was before installing the module, drawing upon the old components stored in the archive. Note that the antimodule for a given module varies depending on the state of the system into which it is installed. This seems to highlight the advantage of using live negotiating objects to convey behavior, rather than static files. As always, I very much welcome questions and feedback! The Spoon project website is http://netjam.org/spoon/. thanks, -C -- Craig Latta improvisational musical informaticist www.netjam.org Smalltalkers do: [:it | All with: Class, (And love: it)]

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Release Announcement: Siren 7.5 Music/Sound Package for Smalltalk
by Stephen Travis Pope 23 May '07

23 May '07

Hello all, Siren 7.5 is now available! The Siren system is an open-source general-purpose software framework for sound and music composition and production; it is a collection of about 375 classes written in the Smalltalk programming language and intended for use with for the VisualWorks Smalltalk system (though most of it is portable to other dialects of Smalltalk). Siren includes cross-platform support for MIDI and audio I/O; the source code and documentation files are all available from the Siren home page at http://FASTLabInc.com/Siren To get the entire release, grab http://FASTLabInc.com/Siren/Siren7.5.zip Siren Documentation Siren 7.5 includes a set of new documentation, including an update on- line workbook, http://FASTLabInc.com/Siren/Workbook/Siren7.5.Workbook.html a complete reference manual, http://FASTLabInc.com/Siren/Manual/index.html a brief paper on the recent updates, http://FASTLabInc.com/Siren/Doc/STP_ICMC07_Siren.pdf a detailed book chapter on the framework, http://FASTLabInc.com/Siren/Doc/SirenBookChapter.pdf and an hour-long in-depth video introduction available in lo-fi (94 MB) and hi-fi (240 MB) versions at http://FASTLabInc.com/Siren/Siren7.5.Demo-lo-res.mov and http://FASTLabInc.com/Siren/Siren7.5.Demo-hi-res.mov respectively. What's New? Many parts of Siren were upgraded, enhanced, or rewritten for the 7.5 release. All of the external interfaces (e.g., for sound I/O, MIDI, FFTW, and other external libraries) have been rewritten to be more portable and robust. The entire EventScheduler has been updated, and there are several new packages, such as the CSL and Loris application packages. In addition to this, Francois Pachet's pitch class framework was ported from his MusEs system. The support for OpenSoundControl has been updated and improved, so that Siren can serve as an OSC- generating client for servers written in several languages, such as CSL and SuperCollider. Two new tools - the SirenUtility and the SirenTransport - have been added to assist users with general environment maintenance and with session state, and data persistency has been incorporated into the SirenSession class. Lastly, the documentation, including the web pages, the on-line Siren workbook, and the complete reference manual, have been greatly enhanced in Siren 7.5. The new release also includes compiled binary releases of the support frameworks Siren uses (PortAudio, PortMIDI, FFTW, etc), which are available at http://FASTLabInc.com/CSL/CSL_Libs.tgz To join the Siren mailing list, please use the web form at http://create.ucsb.edu/mailman/listinfo/SqueakAudio stp -- Stephen Travis Pope -- Santa Barbara, California, USA http://HeavenEverywhere.com http://FASTLabInc.com

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multi-language GUI / shells in Smalltalk
by Ralph Boland 23 May '07

23 May '07

I am developing a replacement for SmaCC (far from complete). Once it is completed I am interested in being able to define languages and have code in these languages placed directly in a Smalltalk (probably Squeak) image. I haven't figured out how this will work. Somewhere there will need to be a specification that a given class or method contains not Smalltalk code but code from some language X. The compiler for language X would generate Smalltalk byte codes that would be stored in the image much like bytes codes of Smalltalk methods. Some example languages: 1) Regular expressions 2) bash shell scripts (Linux) 3) sed scripts (Linux) 4) C There are tons of issues here to be resolved much later. Meanwhile, I thought of two languages worth adding to the list: 4) SLang 5) Assembler for the virtual machine. The reason for 4) is to allow users to write code that they mean to be efficient. My understanding is that SLang is C like and gives similar performance. Of course translating SLang methods to byte codes will slow it down but it should still be useful when performance matters. The reason for 5) is the same though I admit it would be odd for someone who is so committed to performance to write his code in assembler to then choose to write his code for a Smalltalk virtual machine. Questions: a) Is it a good idea to be able to embed other languages/language compilers into a Smalltalk image? I am sure many will object to this idea but I hope there are some supporters as well, as least in principle. At this point I am just interested in hearing what the pros and cons are. b) I am just writing an easier to use, more powerful, and faster SmaCC. To generate byte codes from a language specification more compiler utilities are needed. Has anyone done any work in this area, either in Squeak or other versions of Smalltalk? c) If efficiency is desired when converting a regular expression to a finite state machine, then one option is to represent the finite state machine in machine code or a language that supports computed gotos and collections of goto locations. A transition in the finite state machine might be represented by an instruction of the form: goto followStatesOfThisState at: inputValue ifAbsent: [self reportInvalidInputAndExit]. If I write a compiler to generate Squeak virtual machine bytes codes corresponding to an input regular expression will I be able to generate instructions equivalent to the goto instruction above? Of course there are many problems. The biggest concern I have is that we can't allow the user to generate virtual machine codes that blow the system out of the water. Admittedly this problem could kill the whole idea. Perhaps there are security issues as well. Once the above has been completed I hope to start another project. I want to build a replacement for the Linux shell bash which I call squash. Squash would be a running Squeak image which provides the user with an interface similar to when running the bash shell in Linux. It would also be possible to write squash shell scripts that provided functionality similar to bash shell scripts. Unlike bash shell scripts, however, squash shell scripts would be compiled into files of byte codes called squash executable files. It would also be possible to have other languages whose compilers generate squash executable files and have the squash shell execute them. What does all of us give us (at least on Linux)? Well, I think it gives us: 1) A version of Squeak that interfaces with other languages much better than now, thus making Squeak (Smalltalk) much more useful to the software community in general. 2) The option of using Squeak where scripting languages are now used. And since in the Squeak case the code is compiled into byte codes it should run faster than would be the case for many scripting languages. 3) Since the squash shell scripting language will have the entire Squeak image available to it, it should be a powerful language to write shell scripts in. Comments welcome, especially negative (but constructive) ones. I am looking for comments on whether this is a good or bad idea, not a detailed description of what all the problems are, though the latter may be useful too. Ralph Boland

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Morph>>changed should call super changed?
by Simon Guest 22 May '07

22 May '07

Hi, I've created a "dependent" morph which should be updated if one of several others are changed. So I called addDependent: on the morphs I am observing, expecting to be called back with update: via Object>>changed. However, Morph>>changed overrides Object>>changed, and does not call super, thus stopping this from working. Have I missed something that would enable me to "observe" changes in any other morph? cheers, Simon

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