Squeak-dev July 2010

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The Inbox: System-cbr.354.mcz
by commits＠source.squeak.org 28 Jul '10

28 Jul '10

A new version of System was added to project The Inbox: http://source.squeak.org/inbox/System-cbr.354.mcz ==================== Summary ==================== Name: System-cbr.354 Author: cbr Time: 27 July 2010, 9:40:25.256 pm UUID: f49d8aa0-ca22-47c9-880c-7713a9667439 Ancestors: System-eem.353 Removed cruft from Project class comment to do with project isolation, which is deprecated. If any of the good people of Squeak who are familiar with this stuff would look this over to make certain that I haven't nixed anything that's still relevant, I'd be much obliged. =============== Diff against System-eem.353 =============== Item was changed: Model subclass: #Project instanceVariableNames: 'world uiManager changeSet transcript parentProject previousProject displayDepth viewSize thumbnail nextProject guards projectParameters version urlList environment lastDirectory lastSavedAtSeconds projectPreferenceFlagDictionary resourceManager' classVariableNames: 'AllProjects CurrentProject GoalFreePercent GoalNotMoreThan LastScreenModeSelected UIProcess' poolDictionaries: '' category: 'System-Support'! + !Project commentStamp: 'cbr 7/27/2010 21:36' prior: 0! - !Project commentStamp: 'tk 12/2/2004 12:38' prior: 0! A Project stores the state of a complete Squeak desktop, including the windows, and the currently active changeSet. A project knows who its parent project is. When you change projects, whether by entering or exiting, the screen state of the project being exited is saved in that project. A project is retained by its view in the parent world. It is effectively named by the name of its changeSet, which can be changed either by renaming in a changeSorter, or by editing the label of its view from the parent project. As the site of major context switch, Projects are the locus of swapping between the old MVC and the new Morphic worlds. The distinction is based on whether the variable 'world' contains a WorldMorph or a ControlManager. Saving and Loading Projects may be stored on the disk in external format. (Project named: 'xxx') exportSegment, or choose 'store project on file...'. Projects may be loaded from a server and stored back. Storing on a server never overwrites; it always makes a new version. A project remembers the url of where it lives in urlList. The list is length one, for now. The url may point to a local disk instead of a server. + All projects that the user looks at are cached in the Squeaklet - All projects that the user looks at, are cached in the Squeaklet folder. Sorted by server. The cache holds the most recent version only. When a project is loaded into Squeak, its objects are converted to the current version. There are three levels of conversion. First, each object is converted from raw bits to an object in its old format. Then it is sent some or all of these messages: comeFullyUpOnReload: smartRefStream Used to re-discover an object that already exists in this image, such as a resource, global variable, Character, or Symbol. (sent to objects in outPointers) convertToCurrentVersion: varDict refStream: smartRefStrm fill in fields that have been added to a class since the object was stored. Used to set the extra inst var to a default value. Or, return a new object of a different class. (sent to objects that changed instance variables) fixUponLoad: aProject refStream: smartRefStrm change the object due to conventions that have changed on the project level. (sent to all objects in the incoming project) Here is the calling sequence for storing out a Project: Project saveAs Project storeOnServer Project storeOnServerWithProgressInfo Project storeOnServerInnards Project exportSegmentFileName:directory: Project exportSegmentWithChangeSet:fileName:directory: ImageSegment writeForExportWithSources:inDirectory:changeSet: - --------- - Isolation (not used any more) - When you accept a method, the entire system feels the change, except - projects that are "isolated". In an isolated project, all new global - variables (including new classes) arestored in the project-local - environment, and all changes to preexisting classes are revoked when - you leave the project. When you enter another project, that - project's changes are invoked. Invocation and revocation are handled - efficiently by swapping pointers. To make a project be isolated, - choose 'isolate changes of this project' from the 'changes...' - section of the screen menu. You can use an isolated project for - making dangerous change to a system, and you can get out if it - crashes. A foreign application can have the separate environment it - wants. Also, you can freeze part of the system for a demo that you - don't want to disturb. An isolated project shares methods with all - subprojects inside it, unless they are isolated themselves. Each - isolated project is the head of a tree of projects with which it - shares all methods. - You may 'assert' all changes ever made in the current project to take - effect above this project. This amounts to exporting all the globals - in the current environment, and zapping the revocation lists to that - the current state of the world will remain in force upon exit from - this project. - - [Later: A project may be 'frozen'. Asserts do not apply to it after - that. (Great for demos.) You should be informed when an assert was - blocked in a frozen project.] - - Class definitions are layered by the isolation mechanism. You are - only allowed to change the shape of a class in projects that lie - within its isolation scope. All versions of the methods are - recompiled, in all projects. If you remove an inst var that is in - use in an isolated project, it will become an Undeclared global. It - is best not to remove an inst var when it is being used in another - isolated project. [If we recompile them all, why can't we diagnose - the problem before allowing the change??] - - Senders and Implementors do not see versions of a method in isolated - projects. [again, we might want to make this possible at a cost]. - When you ask for versions of a method, you will not get the history - in other isolated projects. - - Moving methods and classes between changeSets, and merging changeSets - has no effect on which methods are in force. But, when you look at a - changeSet from a different isolated project, the methods will contain - code that is not in force. A changeSet is just a list of method - names, and does not keep separate copies of any code. - - When finer grained assertion is needed, use the method (aProject - assertClass: aClass from: thisProject warn: warnConflicts). - - How isolated changes work: The first time a class changes, store its - MethodDictionary object. Keep parallel arrays of associations to - Classes and MethodDictionaries. Traverse these and install them when - you enter an "ioslated project". When you leave, store this - project's own MethodDictionaries there. - To do an assert, we must discover which methods changed here, - and which changed only in the project we are asserting into. There - is one copy of the 'virgin' method dictionaries in the system. It is - always being temporarily stored by the currently inForce isolated - project. - - isolatedHead - true for the top project, and for each isolated - project. false or nil for any subproject that shares all methods - with its parent project. - - inForce - true if my methods are installed now. false if I am - dormant. [is this equivalent to self == Project Current?] - - classArray - list of associations to classes - - methodDictArray - the method dictionaries of those classes before we - started changing methods. They hang onto the original - compiledMethods. (If this project is dormant, it contains the method - dictionaries of those classes as they will be here, in this project). - - orgArray - the class organizations of the classes in classArray. - - UsingIsolation (class variable) - No longer used. - - When you want to save a project in export format from within that - very project, it gets tricky. We set two flags in parentProject, - exit to it, and let parentProject write the project. - ProjectViewMorph in parentProject checks in its step method, does the - store, clears the flags, and reenters the subProject. - !

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Project Isolation: Is This Still a True Statement?
by Casey Ransberger 28 Jul '10

28 Jul '10

I thought we ripped out the project isolation stuff. >From the lass comment for ChangeSet: "For isolated projects (see Project class comment), the changeSet binding is semi-permanent. Every project exists in an isolation layer defined by its closest enclosing parent (or itself) that is isolated. If a project is not isolated, then changes reported to its designated changeSet must also be reported to the permanent changeSet for that layer, designated in the isolated project. This ensures that that outer project will be able to revert all changes upon exit." Is this statement still true (I don't think so?) Would folks be receptive to my removing it from the comment? While some charitable soul has added a note to the Project class comment that isolation is not used anymore, I think having the large amount of cruft in the comment is at best distracting, and at worst confusing. I'm thinking I'd like to remove that stuff; older images which still use the mechanism will still have the comment, and since we keep all the releases around forever, we aren't at risk of losing the information for folks who want to run an older Squeak. What say the people of Squeak? -- Casey Ransberger

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The Inbox: Kernel-cbr.475.mcz
by commits＠source.squeak.org 28 Jul '10

28 Jul '10

A new version of Kernel was added to project The Inbox: http://source.squeak.org/inbox/Kernel-cbr.475.mcz ==================== Summary ==================== Name: Kernel-cbr.475 Author: cbr Time: 27 July 2010, 8:47:17.817 pm UUID: 31fff092-aa15-4aac-9cff-0edb485a0d25 Ancestors: Kernel-eem.474 A few of the chronology classes met my current heuristic for "comment is too small," and though the comments were fine as is, I added an example usage to each just for fun. =============== Diff against Kernel-eem.474 =============== Item was changed: Timespan subclass: #Week instanceVariableNames: '' classVariableNames: 'StartDay' poolDictionaries: 'ChronologyConstants' category: 'Kernel-Chronology'! + !Week commentStamp: 'cbr 7/27/2010 20:28' prior: 0! + I represent a week. + + To find out what days of the week on which Squeak is fun, select the following expression, and print it: + + Week dayNames! - !Week commentStamp: 'brp 5/13/2003 09:48' prior: 0! - I represent a week.! Item was changed: Timespan subclass: #Year instanceVariableNames: '' classVariableNames: '' poolDictionaries: '' category: 'Kernel-Chronology'! + !Year commentStamp: 'cbr 7/27/2010 20:41' prior: 0! + I represent a year. + + Try me!! Select the following expression and print it: + + Year current daysInYear "Try me again next leap year!!"! - !Year commentStamp: 'dtl 7/11/2009 16:35' prior: 0! - I represent a year.! Item was changed: Timespan subclass: #Month instanceVariableNames: '' classVariableNames: '' poolDictionaries: 'ChronologyConstants' category: 'Kernel-Chronology'! + !Month commentStamp: 'cbr 7/27/2010 20:34' prior: 0! + I represent a month. + + For example, to get the number of days this month, you can evaluate the following expression: + + Month current daysInMonth! - !Month commentStamp: 'brp 5/13/2003 09:48' prior: 0! - I represent a month.! Item was removed: - ----- Method: Integer>>isPrime (in category 'testing') ----- - isPrime - "Answer true if the receiver is a prime number. See isProbablyPrime for a probabilistic - implementation that is much faster for large integers, and that is correct to an extremely - high statistical level of confidence (effectively deterministic)." - - self <= 1 ifTrue: [ ^false ]. - self even ifTrue: [ ^self = 2]. - 3 to: self sqrtFloor by: 2 do: [ :each | - self \\ each = 0 ifTrue: [ ^false ] ]. - ^true! Item was removed: - ----- Method: Float class>>twoPi (in category 'constants') ----- - twoPi - - ^ Twopi - ! Item was removed: - ----- Method: Integer>>isProbablyPrimeWithK:andQ: (in category 'private') ----- - isProbablyPrimeWithK: k andQ: q - "Algorithm P, probabilistic primality test, from - Knuth, Donald E. 'The Art of Computer Programming', Vol 2, - Third Edition, section 4.5.4, page 395, P1-P5 refer to Knuth description." - - "P1" - - | x j y | - x := (self - 2) atRandom + 1. - "P2" - j := 0. - y := x raisedToInteger: q modulo: self. - "P3" - - [(((j = 0) & (y = 1)) | (y = (self - 1))) ifTrue: [^true]. - ((j > 0) & (y = 1)) ifTrue: [^false]. "P5" - true] - whileTrue: - [j := j + 1. - (j < k) ifTrue: [y := y squared \\ self] - ifFalse:[^ false]]! Item was removed: - ----- Method: Object>>isArray (in category 'testing') ----- - isArray - ^false! Item was removed: - ----- Method: Integer>>raisedToInteger:modulo: (in category 'mathematical functions') ----- - raisedToInteger: exp modulo: m - (exp = 0) ifTrue: [^ 1]. - exp even - ifTrue: [^ (self raisedToInteger: (exp // 2) modulo: m) squared \\ m] - ifFalse: [^ (self * (self raisedToInteger: (exp - 1) modulo: m)) \\ m].!

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The Trunk: Tools-cbr.255.mcz
by commits＠source.squeak.org 28 Jul '10

28 Jul '10

David T. Lewis uploaded a new version of Tools to project The Trunk: http://source.squeak.org/trunk/Tools-cbr.255.mcz ==================== Summary ==================== Name: Tools-cbr.255 Author: cbr Time: 27 July 2010, 7:19:26.643 pm UUID: e1ad6ef8-81f2-4cff-84e9-6c6fcda132c2 Ancestors: Tools-ul.254 Cheered up another sad class comment, this time ChangesOrganizer. =============== Diff against Tools-ul.254 =============== Item was changed: Object subclass: #ChangesOrganizer instanceVariableNames: '' classVariableNames: 'ChangeSetNamesInRelease RecentUpdateMarker' poolDictionaries: '' category: 'Tools-Changes'! + !ChangesOrganizer commentStamp: 'cbr 7/27/2010 19:17' prior: 0! + I manage ChangeSets in the system. See the protocols on my class side. + + For an example of what I can do, select the following line in a Workspace and print it. + + + ChangesOrganizer allChangeSetNames! - !ChangesOrganizer commentStamp: 'pk 10/17/2006 09:25' prior: 0! - Changes organizer!

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The Trunk: MorphicExtras-cbr.90.mcz
by commits＠source.squeak.org 28 Jul '10

28 Jul '10

David T. Lewis uploaded a new version of MorphicExtras to project The Trunk: http://source.squeak.org/trunk/MorphicExtras-cbr.90.mcz ==================== Summary ==================== Name: MorphicExtras-cbr.90 Author: cbr Time: 27 July 2010, 6:51:14.719 pm UUID: 3a3ab829-a9c5-4415-b7d5-7861e6fb0413 Ancestors: MorphicExtras-ar.89 Made one of the saddest comments in the system happier. =============== Diff against MorphicExtras-ar.89 =============== Item was changed: Morph subclass: #LedCharacterMorph instanceVariableNames: 'char highlighted' classVariableNames: 'BSegments CHSegmentOrigins CHSegments CVSegmentOrigins CVSegments DSegments TSegments' poolDictionaries: '' category: 'MorphicExtras-Leds'! + !LedCharacterMorph commentStamp: 'cbr 7/27/2010 18:47' prior: 0! + I represent a character to be displayed on an LedMorph; I am a peer to LedDigitMorph. The char 36 is SPACE. + + I can live outside of LedMorphs, however. If you'd like to play with me, evaluate the following line: + + + LedCharacterMorph new char: $e; openInWorld! - !LedCharacterMorph commentStamp: '<historical>' prior: 0! - char 36 is SPACE!

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The Inbox: Tools-cbr.255.mcz
by commits＠source.squeak.org 28 Jul '10

28 Jul '10

A new version of Tools was added to project The Inbox: http://source.squeak.org/inbox/Tools-cbr.255.mcz ==================== Summary ==================== Name: Tools-cbr.255 Author: cbr Time: 27 July 2010, 7:19:26.643 pm UUID: e1ad6ef8-81f2-4cff-84e9-6c6fcda132c2 Ancestors: Tools-ul.254 Cheered up another sad class comment, this time ChangesOrganizer. =============== Diff against Tools-ul.254 =============== Item was changed: Object subclass: #ChangesOrganizer instanceVariableNames: '' classVariableNames: 'ChangeSetNamesInRelease RecentUpdateMarker' poolDictionaries: '' category: 'Tools-Changes'! + !ChangesOrganizer commentStamp: 'cbr 7/27/2010 19:17' prior: 0! + I manage ChangeSets in the system. See the protocols on my class side. + + For an example of what I can do, select the following line in a Workspace and print it. + + + ChangesOrganizer allChangeSetNames! - !ChangesOrganizer commentStamp: 'pk 10/17/2006 09:25' prior: 0! - Changes organizer!

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The Inbox: MorphicExtras-cbr.90.mcz
by commits＠source.squeak.org 28 Jul '10

28 Jul '10

A new version of MorphicExtras was added to project The Inbox: http://source.squeak.org/inbox/MorphicExtras-cbr.90.mcz ==================== Summary ==================== Name: MorphicExtras-cbr.90 Author: cbr Time: 27 July 2010, 6:51:14.719 pm UUID: 3a3ab829-a9c5-4415-b7d5-7861e6fb0413 Ancestors: MorphicExtras-ar.89 Made one of the saddest comments in the system happier. =============== Diff against MorphicExtras-ar.89 =============== Item was changed: Morph subclass: #LedCharacterMorph instanceVariableNames: 'char highlighted' classVariableNames: 'BSegments CHSegmentOrigins CHSegments CVSegmentOrigins CVSegments DSegments TSegments' poolDictionaries: '' category: 'MorphicExtras-Leds'! + !LedCharacterMorph commentStamp: 'cbr 7/27/2010 18:47' prior: 0! + I represent a character to be displayed on an LedMorph; I am a peer to LedDigitMorph. The char 36 is SPACE. + + I can live outside of LedMorphs, however. If you'd like to play with me, evaluate the following line: + + + LedCharacterMorph new char: $e; openInWorld! - !LedCharacterMorph commentStamp: '<historical>' prior: 0! - char 36 is SPACE!

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VNC on Android/ Squeak
by Stefan Krecher 27 Jul '10

27 Jul '10

Hi, i just uploaded a new Squeak-On-Android Image containing a RFB/VNC-Server. This image will only work with a VM build from the current source. It would be really cool if someone would test it, because i still have problems establishing a VNC-Connection to the Squeak-Image running in the Emulator. I can connect with a VNC-Client but the the image freezes/ crashes/ does nothing, maybe it's just an issue with the correct settings. Project Homepage: http://code.google.com/p/squeak-android-vm/ Hints for using VNC on Android: http://code.google.com/p/squeak-android-vm/wiki/VNC Any Help/ Hints are very welcome! regards, Stefan

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ProgressDisplay package released
by Ralph Boland 27 Jul '10

27 Jul '10

I just released the first draft of my package PackageDisplay to SqueakSource. It is like SystemProgressMorph et. al. but with a lot of bells and whistles added. It is not a suitable replacement for SystemProgressMorph though because it is too large and specific for that. SystemProgressMorph could be made a subclass of one of its classes though. It is designed largely to meet my specific needs but since it's MIT anyone may use it, steal components, or move components of it to Squeak. It has a utility class category with useful classes for things like array permutation generation and array multiset permutation generation, numeric partitioning of a number, and a class RangeList (which I will be expanding upon later). All of these classes will be removed when the package meant to contain them is ready (not soon). There are also a number of utility methods that could be stolen or put into Squeak proper. It probably has lots of bugs, so bug reports appreciated. Comments on its function, design, and implementation most welcome. Proposals for improvements or extensions will be considered but no promises. If you need access to make changes let me know. If Levente Uzonyi likes it but feels compelled to rewrite it completely from scratch, thats OK too. :-) One of my reasons for releasing it is because of a bug I could not fix. It is supposed to be possible to turn on the ability to catch user interrupts but when this feature is turned on and an interrupt generated while the progress bar is displayed the interrupt is caught but not processed until the progress bar closes. :-( Of course the interrupt was meant to be processed immediately. If anyone can tell me how to fix this bug (or better still send me the code or add the code to the package) that would be great! If you use the package I would appreciate knowing since I would like to know who may be impacted by changes I make in the future. The more software impacted the more careful I need to be. Regards, Ralph Boland

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Fwd: Call for Participation - C5-2011, Kyoto, Japan
by Andreas Raab 26 Jul '10

26 Jul '10

-------- Original Message -------- Subject: Call for Participation - C5-2011, Kyoto, Japan Date: Sun, 25 Jul 2010 19:30:05 -0700 From: Kim Rose <kim.rose(a)vpri.org> To: Kim Rose <kim.rose(a)vpri.org> Dear Friends& Colleagues, I am pleased to announce the 9th C5 Conference to be held January 18-20, in its "home", Kyoto, Japan. The organizing committee appreciates your encouraging submissions of papers and attendance to this gathering in Kyoto. Thanks for spreading this call to colleagues and mailing lists/groups you belong that are appropriate. I hope to see you and/or your colleagues there! Best, Kim ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Call for Papers Ninth International Conference on Creating, Connecting and Collaborating through Computing (C5 2011) 18-20 January 2011 Kyoto University, Kyoto, Japan http://www.cm.is.ritsumei.ac.jp/c5-11/ Computers, networks, and other forms of technology are pervasive in our information-based society. Unfortunately, most users of this technology use it for passive consumption of information and entertainment. 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 anyone interested in the use of computers as tools to develop and enable user-oriented creation, connection, and collaboration processes. Researchers, developers, educators and users come together at C5 to present new and ongoing work and to discuss future directions for creative computing and multimedia environments. We welcome the submission of theoretical and technical papers, practitioner/experience reports, and papers that bridge the gap between theory and practice or that encourage inter- and cross-disciplinary study. === Submissions === C5 invites submissions of full papers in (but not limited to) the following areas: * Technology-enhanced human-computer and human-human interaction * Multimedia authoring environments * New technologies for literature, music and the visual arts * Virtual worlds and immersive environments * Gaming/entertainment platforms and infrastructure * Social networks and social networking * Novel programming paradigms and languages for implementors * Scripting or visual paradigms and languages for end-users * Creating and maintaining online communities * Tools for creating/managing online services/environments * Distributed and collaborative working * Educational environments for classroom, field work and online/distance learning * Technologies for collaborative and self-empowered learning * Social and cultural implications of new technologies Papers should be submitted electronically in PDF format via EasyChair at: http://www.easychair.org/conferences/?conf=c511 Submissions must be written in English (the official language of the conference) and must not exceed eight (8) pages. They should use the IEEE 10-point two-column format, templates for which are available at: http://www.computer.org/portal/web/cscps/home === Proceedings === A preliminary version of the proceedings will be distributed during the conference. The formal version of the proceedings will be published by the Conference Publishing Services (CPS) and sent to authors after the conference. For each accepted paper, at least one of the authors needs to attend the conference and deliver the presentation; otherwise the paper will not be included in the formal proceedings. === Dates === Submission of papers: October 8, 2010 Author notification: November 19, 2010 Camera-ready copy: December 19, 2010 Conference: January 18-20, 2011

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