Squeak-dev March 2014

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139 discussions

The Trunk: KernelTests-nice.264.mcz
by commits＠source.squeak.org 21 Mar '14

21 Mar '14

Nicolas Cellier uploaded a new version of KernelTests to project The Trunk: http://source.squeak.org/trunk/KernelTests-nice.264.mcz ==================== Summary ==================== Name: KernelTests-nice.264 Author: nice Time: 21 March 2014, 6:40:48.635 pm UUID: e99bef3c-6fa7-8d4f-b491-f9ef0f98ed63 Ancestors: KernelTests-nice.263 A non regression test for just found sqrtFloor bug. =============== Diff against KernelTests-nice.263 =============== Item was added: + ----- Method: LargePositiveIntegerTest>>testLargeSqrtFloor (in category 'tests') ----- + testLargeSqrtFloor + "This test fails if a careless implementation naivly factors out the power of two (remove the trailing zeroes up to lowBit). + This was the case in a previous Squeak 4.x implementation." + + | large root | + large := (SmallInteger maxVal << 100 + 1) << 100. + root := large sqrtFloor. + self assert: root squared <= large. + self assert: (root+1) squared > large.!

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The Trunk: Kernel-nice.843.mcz
by commits＠source.squeak.org 21 Mar '14

21 Mar '14

Nicolas Cellier uploaded a new version of Kernel to project The Trunk: http://source.squeak.org/trunk/Kernel-nice.843.mcz ==================== Summary ==================== Name: Kernel-nice.843 Author: nice Time: 21 March 2014, 6:28:55.456 pm UUID: 28ea5418-9be7-964b-b0c1-fde1bf8528a3 Ancestors: Kernel-nice.842 Correct the bug I introduced for large integer sqrtFloor. If receiver was of the form 2^2n*u we did answer 2^n *E(sqrt(u)) But sqrt(u) = E(sqrt(u)) + residue where 0<=residue<1 And result is rather E(2^n*sqrt(u)) = E( 2^n*(E(sqrt(u)) + residue)) = 2^n*E(sqrt(u)) + E(2^n*residue) As 2^n * residue can be big (superior to 1), we miss the correct value by default. If we want to correct this, an approximation of residue is (u-E(sqrt(u))^2) / 2 E(sqrt(u)) This is more or less like super Newton-Raphson inner loop... It would be possible to duplicate super work, but I feel like it's adding too much complexity for small reward, so I prefer to remove offending code for now =============== Diff against Kernel-nice.842 =============== Item was removed: - ----- Method: LargePositiveInteger>>sqrtFloor (in category 'mathematical functions') ----- - sqrtFloor - "Return the integer part of the square root of self" - - | powerOfTwo | - (powerOfTwo := self lowBit - 1 // 2) > 1 - ifFalse: [^super sqrtFloor]. - ^(self bitShift: -2 * powerOfTwo) sqrtFloor bitShift: powerOfTwo!

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Fwd: [Newbies] Re: Website change, Squeek by Example Game?
by Chris Cunnington 21 Mar '14

21 Mar '14

The previous email: "Can we help abuzar? Begin forwarded message: > From: Abuzar <abuzar at abuzar.com> > Subject: [Newbies] Re: Website change, Squeek by Example Game? > Date: 21. März 2014 14:20:26 MEZ > To: beginners at lists.squeakfoundation.org > Reply-To: "A friendly place to get answers to even the most basic questions about Squeak." <beginners at lists.squeakfoundation.org> > Delivered-To: list-beginners at lists.squeakfoundation.org > > Hi all, > > I'm still looking for that specific tutorial, and a recommendation on > whether it's obsolete or other advice. A response would be > appreciated. > > Thanks, > Abuzar > > > On Wed, Mar 12, 2014 at 7:04 PM, Abuzar <abuzar at abuzar.com> wrote: >> Hi all, >> >> I was going through a squeek-by-example tutorial. Not the .pdf book. >> It was a simple game tutorial on the Documentation page. After the >> website changeover, it has seemingly disappeared. Is it now obsolete? >> or no longer recommended? >> >> I'm also noticing that Squeak 4.5 is rolling out. Is this a big >> change? Should I hold off going through tutorials until they're >> updated? >> >> Abuzar > _______________________________________________ > Beginners mailing list > Beginners at lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners" You could help abuzar by 1) posting this kind of thing on the webteam list and 2) finding what you think got lost and handing it to me. I change and upload. People hand me changes they know they want and where they want them. How about you deploy the old image in localhost and find what you're talking about and then where on the new site you want it? I feel entitled to say there are limits to my brief. http://chriscunnington.com/oldsqueaksite.zip Chris

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Fwd: [Newbies] Re: Website change, Squeek by Example Game?
by Tobias Pape 21 Mar '14

21 Mar '14

Can we help abuzar? Begin forwarded message: > From: Abuzar <abuzar(a)abuzar.com> > Subject: [Newbies] Re: Website change, Squeek by Example Game? > Date: 21. März 2014 14:20:26 MEZ > To: beginners(a)lists.squeakfoundation.org > Reply-To: "A friendly place to get answers to even the most basic questions about Squeak." <beginners(a)lists.squeakfoundation.org> > Delivered-To: list-beginners(a)lists.squeakfoundation.org > > Hi all, > > I'm still looking for that specific tutorial, and a recommendation on > whether it's obsolete or other advice. A response would be > appreciated. > > Thanks, > Abuzar > > > On Wed, Mar 12, 2014 at 7:04 PM, Abuzar <abuzar(a)abuzar.com> wrote: >> Hi all, >> >> I was going through a squeek-by-example tutorial. Not the .pdf book. >> It was a simple game tutorial on the Documentation page. After the >> website changeover, it has seemingly disappeared. Is it now obsolete? >> or no longer recommended? >> >> I'm also noticing that Squeak 4.5 is rolling out. Is this a big >> change? Should I hold off going through tutorials until they're >> updated? >> >> Abuzar > _______________________________________________ > Beginners mailing list > Beginners(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners

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Exporting 4.4 projects to 4.5
by Herbert König 21 Mar '14

21 Mar '14

Hi, importing projects saved in 4.4 into 4.5 does not work. If I save an empty project in 4.4 loading it in 4.5 complains about missing MultiNewParagraph. Looking into Multilingual-Scanning category I notice that most classes are missing now. Is this intentional? Cheers Herbert

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Process improvement for 4.6, a new .sources file!
by Chris Muller 21 Mar '14

21 Mar '14

I've spent my last couple of afternoons learning about and tweaking our condenseSources methods and process and think have come to something that gives us the best balance between all factors: size, thoroughness, and convention. http://wiki.squeak.org/squeak/6196

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Unintended consequences; part zillion of a gazillion
by tim Rowledge 20 Mar '14

20 Mar '14

I just stumbled over a fairly amusing case of unintended consequences. In MenuMorph we have the ability to add icons next to the text labels of any menu item. To be ‘helpful’ somebody decided to allow parsing of the texts sent to MenuItemMorphs to see if .. (#('<on>' '<off>' '<yes>' '<no>') includes: marker) and if so, attach a suitable icon to the entry. Unfortunately, ‘no’ is also the code for the Norwegian language setting, so a menu of language codes has this mysterious big ‘X” icon next to that entry. So far as I can see right now there isn’t any way to actually access the menu building so as to tell it not to be so ‘helpful. I’m sure it wouldn’t be too hard but I just don’t have time to worry about that for now. A lesson in the need for careful thinking, brought to you by the letters ’n’ and ‘o’. tim -- tim Rowledge; tim(a)rowledge.org; http://www.rowledge.org/tim 'Profanity: the universal programming language'

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Audio problem, an Exception on sqUnixSoundOSS.c.
by Gustavo Duarte 19 Mar '14

19 Mar '14

Hi folks, Information: Image: Scratch SqueakVm: 4.10.2-2614 Sist. Op: Ubuntu 12.04 Steps to reproduce this error. 0) Execute SqueakVm from a console. 1) Go to sounds, and play the default record already on the image. 2) Hear the sound, without problem 3) Click on button to record a new sound. 4) An exception is raised, showed bellow. Executing: padsp /usr/lib/squeak/4.10.2-2614/squeakvm -encoding UTF-8 -vm-display-x11 -xshm -plugins /usr/lib/scratch/plugins/:/usr/lib/squeak/4.10.2-2614/ -vm-sound-oss /usr/share/scratch/Scratch.image squeakvm: /tmp/makepackage/PACKAGES/squeak-vm/source/unix/vm-sound-OSS/sqUnixSoundOSS.c:355: dspOpen: La declaración `dsp->fd < 0' no se cumple. Abortado 1) Is right report this issue here ? is it squeakvm bug ? Or should i report on Scratch tracker list ? 2) What else can I do to try figure out what is happening ? Thanks in advance. Gustavo.

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Re: [ANN] PathFinder (was Re: [ANN] The Path Tools Framework)
by Michael Perscheid 18 Mar '14

18 Mar '14

Hi all, the next tool of our Path tools framework is “PathFinder” a lightweight back-in-time debugger for (reproducible) test cases. Compared to PathMap where we analyzed multiple test cases at once, PathFinder allows developers to focus on one specific test case and to explore its details. A test case executes one specific path through the system which can be recorded with all its behavior and state to understand the complete execution history. However, traditional approaches for analyzing a program’s run-time are time-consuming and expensive. They capture comprehensive information about the entire execution up-front, which is in large parts not required at all. We solve this problem with the reproducible and deterministic properties of test cases. We assume that a test case always takes the same path through the system so that each execution comprises the same behavior and state information. With this insight, we are able to split the expensive analysis of a program’s run-time over multiple test runs. Based on developers’ decisions, we divide the analysis into multiple steps: A high-level analysis followed by on-demand refinements. Thus, we incrementally collect only the data developers are interested in and so reduce the analysis overhead to a minimum while preserving instantaneous access to detailed execution histories. Based on this analysis technique, PathFinder implements a lightweight back-in-time debugger for introspecting specific test case executions that supports the characteristics of immediacy. Moreover, this tool reuses PathMap's anomalies in order to classify traces with suspicious behavior and state. So, developers can follow infection chains back to their root causes without much effort. More documentation can be found here: http://www.hpi.uni-potsdam.de/hirschfeld/trac/SqueakCommunityProjects/wiki/… http://www.hpi.uni-potsdam.de/hirschfeld/trac/SqueakCommunityProjects/wiki/… http://www.hpi.uni-potsdam.de/hirschfeld/trac/SqueakCommunityProjects/wiki/… Best regards, Michael > On 03.03.2014, at 10:30, Michael Perscheid <michaelperscheid(a)googlemail.com> wrote: > >> Hi all, >> >> as promised, I’d like to further present parts of our Path tools framework. In this mail, I introduce the "PathMap test runner". >> >> Test cases possess a valuable source of information as they implicitly define expected and unexpected behavior all over the system. During the execution of their exemplary assertions, they do not merely cover directly-tested methods but rather large call sequences with corresponding states through internal parts of the system. Based on this idea, we can inductively derive from the specific run-time values of executed test cases more generalized and helpful program properties. By making this hidden test knowledge available, developers have additional information for debugging, testing, and understanding their programs. >> >> PathMap is our extended test runner that reveals the hidden knowledge of test cases and presents it to developers. It provides a low overhead analysis framework that computes coverage data, likely invariants, and static metrics and displays the results in form of a scalable tree map visualization representing the system under observation. >> >> <pathMap.png> >> >> To start a specific analysis of your system under test, select your tests, choose a flap from the right side (large icons, description see below), and press the button “run selected”. >> >> PathMap Analyses Modes (Flaps from top to bottom): >> >> * The test quality flap analyzes the (method) coverage of test cases (effectivity) and relates it to different static metrics. This allows developers to answer questions such as which methods require more tests and which author is responsible for missing tests. >> >> * The profiling flap measures the run-time characteristics of test cases (efficiency) and their relation to the methods of the system under observations. Performance bottlenecks, memory leaks, and massively called methods can be revealed with this analysis. >> >> * The fault localization flap reveals spectrum-based anomalies (methods) that have a high probability to include failure causes. By comparing the coverage of all failed and passed test cases, we offer several starting points for debugging failing test cases and creating initial failure cause hypotheses. >> >> * The induction flap derives likely invariants from passing test cases. We expect that every state (parameter, receiver, return value) of a passing test is also a valid data point. Based on this assumption, we generalize concrete run-time values all over the system into assertions. Such likely invariants can help in program comprehension as well as debugging if they are compared to failing test cases. (Analysis can take some time) >> >> * The traceability flap connects arbitrary concerns and software artifacts with test cases in order to analyze their relationship with the code base. For example, requirements can be related to their acceptance tests and we compute methods that overlap or are completely specific to requirements. >> >> More documentation can be found here: >> http://www.hpi.uni-potsdam.de/hirschfeld/trac/SqueakCommunityProjects/wiki/… >> http://www.michaelperscheid.de/projects/index.html >> >> Best regards, >> Michael >> >> On 22.02.2014, at 18:19, Michael Perscheid <michaelperscheid(a)googlemail.com> wrote: >> >>> Hi all, >>> >>> I’m pleased to announce the release of our Path Tools Framework that has been developed >>> during the last five years as part of my dissertation. >>> >>> https://www.hpi.uni-potsdam.de/hirschfeld/trac/SqueakCommunityProjects/wiki… >>> >>> The Path Tools Framework comprises several development tools for supporting typical software >>> maintenance tasks such as debugging, testing, and program comprehension. It realizes among >>> others our test-driven fault navigation (a systematic debugging approach that leads developers >>> from the observable failure back to root causes), test quality feedback (improve software quality >>> by analyzing test cases), and model-based source code editing (single source development >>> method that joins model-driven development and standard source code editing). >>> >>> As there are several tools and use cases, we will provide more detailed information in following >>> announcements. Nevertheless, all tools are already available and can be tested. Furthermore, >>> there is also a bunch of documentation, screencasts, and published papers. >>> >>> http://www.michaelperscheid.de/projects/index.html >>> >>> Have fun :-) >>> >>> Best regards, >>> Michael >>> >>> --- >>> Dr.-Ing. Michael Perscheid >>> michaelperscheid(a)googlemail.com >>> >>> http://www.michaelperscheid.de/ >>> >> >> --- >> Dr.-Ing. Michael Perscheid >> michaelperscheid(a)googlemail.com >> >> http://www.michaelperscheid.de/ >> > > --- > Dr.-Ing. Michael Perscheid > michaelperscheid(a)googlemail.com > > http://www.michaelperscheid.de/ > --- Dr.-Ing. Michael Perscheid michaelperscheid(a)googlemail.com http://www.michaelperscheid.de/

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Squeak/.NET Bridge
by Germán Arduino 18 Mar '14

18 Mar '14

Hi Guys: The url from http://map.squeak.org/package/f4f46616-3def-4f6c-b574-7b04d78dca28 ( saltypickle.com) seems not work. The domain seems not be available anymore. Someone know from where I can download the latest version of the .mcz? Thanks.

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