Squeak-dev December 2011

squeak-dev@lists.squeakfoundation.org

52 participants
175 discussions

How Moprhs is rendered
by Hilaire Fernandes 24 Jan '12

24 Jan '12

To optimise the DrGeo canvas (get it faster), I try to understand in detail how is done the rendering of Morphs embedded in a pasteupmorph. I did not find any detailed information on the Internet about that. Any pointer? Right now, DrGeo canvas is a pasteUpMorph, the line, segment, point, circle, etc. are all Morph added in the pasteUpMoprh. When the model of a geometry sketch is updated, then all the Morphs view are updated in one shot (it appeared to be faster than to climb the model tree to update only the morphs needing update) Hilaire -- Education 0.2 -- http://blog.ofset.org/hilaire

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[ANN] Koans for Teaching the Basics of Smalltalk
by Michael Perscheid 06 Jan '12

06 Jan '12

Hi all, it's a pleasure for me to announce the Koans tutorial project for teaching beginners the basics of Smalltalk. Inspired by the Edgecase Ruby Koans project and the original "The little Lisper" book by Daniel P. Friedman and Matthias Felleisen, we have implemented Smalltalk Koans in order to help our students to get started with Smalltalk. Smalltalk Koans will guide you as a Smalltalk novice from first steps in Smalltalk to your first small project. The path is simple: You get a task, you solve it and, in the process, learn something. The Koans Sensei (jap.: teacher) will be your guide and introduce you to fundamental concepts in Smalltalk such as strings, blocks, collections and many more. After a first internal use, we'd like to announce that we make this tutorial project available for the community. https://www.hpi.uni-potsdam.de/hirschfeld/trac/SqueakCommunityProjects/wiki… Especially, we'd like to acknowledge our student assistants, Eric Seckler, Robin Schreiber, and Partick Rein for implementing Koans in Smalltalk. If you have any wishes for new lectures and feedback to existing ones, please let us know. Best regards, Michael

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Monticello trickery: pointers needed
by Frank Shearar 04 Jan '12

04 Jan '12

Hi, The background to the question is that I'm trying to repackage LanguageBoxes so that both the Squeak and Pharo community can use its features (or just parts of it). Cutie-Helvetia defines a class, CURaisedToExample. Among others, it defines two methods: CURaisedToExample class >> #raise:to and CURaisedToExample >> testSplice. The latter makes use of QQCompiler's splice operation (just like Common Lisp's) - @foo will replace 'foo' with whatever 'foo' evaluates to, so compiling 'a := @(3 + 4)' means the same thing as 'a := 7'. Now testSplice says self assert: `@(self raise: 2 to: -3) = (1/8). which means that, _at_compile_time_, testSplice will invoke #raise:to: (the self refers to the class-side method)... and at this point in time #raise:to: has been compiled, but not installed. Compiling #testSplice fails with a MessageNotUnderstood, and package loading aborts. My question is this: how can I work around this? Can I move the installation of #raise:to: to a preload step? Some hacks that spring to mind, and don't seem very pleasant, are: * introduce a new superclass defining the method, put that in a seperate package, and load that package before Cutie-Helvetia * move the definition of CURaisedToExample and #raise:to: to a separate package, and make all the tests extensions to that package. frank

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Daily Commit Log
by commits＠source.squeak.org 31 Dec '11

31 Dec '11

Changes to Trunk (http://source.squeak.org/trunk.html) in the last 24 hours: http://lists.squeakfoundation.org/pipermail/packages/2011-December/005154.h… Name: Collections-dtl.469 Ancestors: Collections-cmm.468 Fix weak finalization thrashing, root cause of user interrupt issues. Perform the check for VM support of new finalization once at image startUp time. This prevents the weak finalization process from creating new weak references that result in thrashing between VM and image as the VM signals the the image to clean up weak references, and the finalization process produces additional weak to be removed. With this change the finalization process is much less active, and user interrupt handling works as intended such that any of the following can interrupted in the expected way: "[true] whileTrue" "[[true] whileTrue] forkAt: Processor userSchedulingPriority + 1" "Smalltalk createStackOverflow" "[Smalltalk createStackOverflow] forkAt: Processor userSchedulingPriority + 1" =============================================

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irc client with squeak?
by Lawson English 30 Dec '11

30 Dec '11

has anyone used the irc client lately? MCHttpRepository location: 'http://www.squeaksource.com/IRC' user: '' password: '' Using 4.3, it breaks with syntax errors at too many places for me to figure out how to correct on-the-fly. Just wondering if anyone has used it and gotten it to work recently. L.

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The Trunk: Collections-dtl.469.mcz
by commits＠source.squeak.org 30 Dec '11

30 Dec '11

David T. Lewis uploaded a new version of Collections to project The Trunk: http://source.squeak.org/trunk/Collections-dtl.469.mcz ==================== Summary ==================== Name: Collections-dtl.469 Author: dtl Time: 30 December 2011, 12:57:50.064 am UUID: f8d7d7a5-e127-4108-95ae-6ef48ac43d86 Ancestors: Collections-cmm.468 Fix weak finalization thrashing, root cause of user interrupt issues. Perform the check for VM support of new finalization once at image startUp time. This prevents the weak finalization process from creating new weak references that result in thrashing between VM and image as the VM signals the the image to clean up weak references, and the finalization process produces additional weak to be removed. With this change the finalization process is much less active, and user interrupt handling works as intended such that any of the following can interrupted in the expected way: "[true] whileTrue" "[[true] whileTrue] forkAt: Processor userSchedulingPriority + 1" "Smalltalk createStackOverflow" "[Smalltalk createStackOverflow] forkAt: Processor userSchedulingPriority + 1" =============== Diff against Collections-cmm.468 =============== Item was changed: ----- Method: WeakArray class>>finalizationProcess (in category 'private') ----- finalizationProcess + | initialized | + initialized := false. + [FinalizationSemaphore wait. + initialized ifFalse: ["check VM capability once at image startup time" + WeakFinalizationList initTestPair. + Smalltalk garbageCollect. - [ WeakFinalizationList initTestPair. - FinalizationSemaphore wait. - FinalizationLock critical: - [ WeakFinalizationList checkTestPair. + initialized := true]. + FinalizationLock critical: + [FinalizationDependents do: + [ :weakDependent | - FinalizationDependents do: - [:weakDependent | weakDependent ifNotNil: [weakDependent finalizeValues]]] ifError: + [:msg :rcvr | rcvr error: msg]] repeat! - [:msg :rcvr | rcvr error: msg] ] repeat!

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More squeak tutorials: simple algorithm visualization tool
by Lawson English 30 Dec '11

30 Dec '11

I'm working on a tool to visualize simple algorithms and data structures for my tutorials http://www.youtube.com/watch?v=O8mimAy5_es&list=PL6601A198DF14788D&index=48… http://www.youtube.com/watch?v=QAA0mGRAQwY&list=PL6601A198DF14788D&index=49… Currently, it only supports display of Array>>at: #at:put: #wrapAt: #wrapAt:put: in the near term, I'm working on the display of operations on the the elementary data structures like linked lists, trees, etc, with the elementary algorithms for sorting/searching/insert/delete/etc. I'm refactoring as I go. The second iteration still needs much work even within the context of Array methods. Suggestions/comments/criticisms welcome, thanks. Lawson

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Daily Commit Log
by commits＠source.squeak.org 30 Dec '11

30 Dec '11

Changes to Trunk (http://source.squeak.org/trunk.html) in the last 24 hours: http://lists.squeakfoundation.org/pipermail/packages/2011-December/005153.h… Name: System-cwp.467 Ancestors: System-laza.466 SystemOrganizer>>classify:under: now uses #at:ifAbsent: to look up a class when generating system change notifications. This prevents bogus change notifications and walk backs when running tests against SystemOrganizer instances. =============================================

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Monticello: loading multiple packages only mentions first package's name
by Frank Shearar 29 Dec '11

29 Dec '11

I have a small Installer script called logic.st: Installer cache install: 'AlgebraicDataType'; install: 'Unification'; install: 'Zippers' and I pass that in as the startup script when I start up my Squeak (whether a pre-4.3 or a 4.3 (yay!)), I see the usual progress bar. It says "Compiling AlgebraicDataType-fbs.nn" and then "Installing AlgebraicDataType-fbs.nn", as expected. And then it says the same thing again, talking about installing and compiling AlgebraicDataType instead of Unification, and then again when loading Zippers. The packages all load correctly: it's just the progress morph giving a misleading status message. Has anyone else seen this? frank

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Squeak 4.3 released
by Chris Cunnington 29 Dec '11

29 Dec '11

Congratulations for release and I hope you'll soon provide an All-in-One package too, as there is for 4.2 still linked from Download box on http://www.squeak.org. Yup, there are a number of released-related tasks that need doing and I've added that to the list. I'm sure they'll all be taken care of soon. Chris

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