- Pharo-users - lists.pharo.org

Re: [Pharo-users] [Pharo-dev] looking for input for a lecture on TDD and XtremeTDD
by HernÃ¡n Morales Durand April 15, 2020

April 15, 2020

Hi Stef, One of the funniest talks about TDD is the one from HernÃ¡n Wilkinson : https://youtu.be/x4CXWBW5fMo (minute 29 starts the TDD coding show) It's in Argentine Spanish dialect, but it's worth to see. Cheers, HernÃ¡n El mar., 14 abr. 2020 a las 9:36, StÃ©phane Ducasse (< stephane.ducasse(a)inria.fr>) escribiÃ³: > Hello > > I would like to build a lecture around TDD and XtremeTDD (coding in the > debugger). > Iâm looking around to see if someone already did such a lecture. > > S. > -------------------------------------------- > StÃ©phane Ducasse > http://stephane.ducasse.free.fr / http://www.pharo.org > 03 59 35 87 52 > Assistant: Julie Jonas > FAX 03 59 57 78 50 > TEL 03 59 35 86 16 > S. Ducasse - Inria > 40, avenue Halley, > Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza > Villeneuve d'Ascq 59650 > France > >

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Problem downloading images
by Vitor Medina Cruz April 14, 2020

April 14, 2020

Hello, I am having problem downloading new images through PharoLauncher, it's very slow and around 20% download it tells "ConnectionTimedOut: Data Receive time out". Full stacktrace is below. Actually, I couldn't download the new version of PharoLauncher too, it is very slow and then it fails. Is there some problem or maintenance in the servers? PhLDownloadManager>>downloadFailureForUrl: [ :exception | self downloadFailureForUrl: url ] in PhLDownloadManager>>newHTTPClientForUrl: in Block: [ :exception | self downloadFailureForUrl: url ] BlockClosure>>cull: Context>>evaluateSignal: Context>>handleSignal: ConnectionTimedOut(Exception)>>pass [ :exception | retryCount > 0 ifTrue: [ self handleRetry: exception; executeWithRetriesRemaining: retryCount - 1 ] ifFalse: [ exception pass ] ] in ZnClient>>executeWithRetriesRemaining: in Block: [ :exception | ... BlockClosure>>cull: Context>>evaluateSignal: Context>>handleSignal: ConnectionTimedOut(Exception)>>signal ConnectionTimedOut(Exception)>>signal: ConnectionTimedOut class(Exception class)>>signal: [ ConnectionTimedOut signal: 'Data receive timed out.' ] in Socket>>waitForDataFor: in Block: [ ConnectionTimedOut signal: 'Data receive timed o...etc... Socket>>waitForDataFor:ifClosed:ifTimedOut: Socket>>waitForDataFor: ZdcSecureSocketStream(ZdcAbstractSocketStream)>>socketWaitForData ZdcSecureSocketStream>>readEncryptedBytes:startingAt:count: ZdcSecureSocketStream>>connect ZnClient>>setupTLSTo: ZnClient>>newConnectionTo: ZnClient>>getConnectionAndExecute ZnClient>>executeWithRedirectsRemaining: [ self executeWithRedirectsRemaining: self maxNumberOfRedirects ] in ZnClient>>executeWithRetriesRemaining: in Block: [ self executeWithRedirectsRemaining: self maxNumb...etc... BlockClosure>>on:do: ZnClient>>executeWithRetriesRemaining: [ self executeWithRetriesRemaining: self numberOfRetries ] in [ [ self executeWithRetriesRemaining: self numberOfRetries ] on: Error do: self ifFailBlock ] in ZnClient>>executeWithTimeout in Block: [ self executeWithRetriesRemaining: self numberOfR...etc... BlockClosure>>on:do: [ [ self executeWithRetriesRemaining: self numberOfRetries ] on: Error do: self ifFailBlock ] in ZnClient>>executeWithTimeout in Block: [ [ self executeWithRetriesRemaining: self numberO...etc... [ ^ block value ] in ZnClient>>withTimeoutDo: in Block: [ ^ block value ] regards, Vitor

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Re: [Pharo-users] [ANN] QRCode on github
by Torsten Bergmann April 14, 2020

April 14, 2020

Hi Renaud, your code is also based on the orginal version of Jochen Rick. Jochens code always worked but unfortunately had only a few tests and was codewise hard to understand. Dont know if you just moved or also refactored and extended it. I also once started with a clean reimplementation (also based on Jochens code but also checked barcode code from Java/JavScript) - mainly to understand the algorithms. I also did not want to limit to QR but also other barcode, includes proper packaging and more tests. Result is here: https://github.com/astares/Pharo-Barcode including also EAN8/EAN13 barcodes. Had to put it aside for time reasons - but maybe this could be the base for a full and clean barcode library for Pharo. I can move it to a community hosted location if more people want to join. Thanks T. Gesendet:Â Dienstag, 14. April 2020 um 00:19 Uhr Von:Â "Renaud de Villemeur via Pharo-users" <pharo-users(a)lists.pharo.org> An:Â "Any question about pharo is welcome" <pharo-users(a)lists.pharo.org> Cc:Â "Renaud de Villemeur" <renaud.devillemeur(a)tuta.io> Betreff:Â [Pharo-users] [ANN] QRCode on github Â

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Problem switching from PetitParser to PetitParser2
by PBKResearch April 14, 2020

April 14, 2020

Hello I have been switching part of a package called TextLint so that it uses PetitParser2 as the parsing engine. For the most part it went fairly smoothly, but I have one problem which occurs in many places. The original parse rules had many conditional matching rules based on PPPredicateObjectParser. I have changed this to PP2PredicateObjectNode, using the same block as a predicate in each case. All of them fail when I test run them in a playground; in every case the error message is of the form: 'Character does not understand [some condition testing method]'. The condition being tested is meaningless for a character - it applies to a token produced by some earlier parsing. Looking at the code for PP2PredicateObjectNode>>#predicate:, I see that the predicate is always treated as a PP2CharSetPredicate, which is claimed to be a performance optimization. The error messages I have seen come from the initialization of this, setting up the 255 precomputed results, because they all relate to a character with asciiValue = 1. All these rules worked in PetitParser, because the methods for PPPredicateObjectParser allow one to distinguish between a character set predicate and a general block; in fact, the class side contains a large variety of methods for generating conditions. As far as I can see, PP2PredicateObjectNode allows only one type of condition. Have I misunderstood - is there some way to specify the condition is not a character set? Thanks for any help Peter Kenny

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Re: [Pharo-users] [ANN] QRCode on github
by Sven Van Caekenberghe April 14, 2020

April 14, 2020

Great, thanks. This is indeed a very well written project. > On 14 Apr 2020, at 00:19, Renaud de Villemeur via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Renaud de Villemeur <renaud.devillemeur(a)tuta.io> > Subject: [ANN] QRCode on github > Date: 14 April 2020 at 00:19:58 GMT+2 > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > > > Need to generate a QRCode ? An old (but still relevant) project was available on smalltalkhub. > > As I wasn't aware if it was already available elsewhere, I moved it to Github, including load instruction: > https://github.com/rvillemeur/QRCode > > Unit test are all green on Linux. > > Have fun. > Renaud > > > > >

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Migrating your projects to GitHub? Do not forget to tag your project!
by Esteban Lorenzano April 14, 2020

April 14, 2020

Hello, Just a gentle reminder to tag your project as âPharoâ, so a search engine can find it better! Esteban

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[ANN] QRCode on github
by Renaud de Villemeur April 13, 2020

April 13, 2020

Need to generate a QRCode ? An old (but still relevant) project was available on smalltalkhub. As I wasn't aware if it was already available elsewhere, I moved it to Github, including load instruction: https://github.com/rvillemeur/QRCode Unit test are all green on Linux. Have fun. Renaud

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April 13, 2020

Hi, I wanted to do a moving/rolling average on raw data [1]. I havenât find code for that (maybe this is done in polymath though). So I ended writing that (I thing this is SMA): SequenceableCollection>>movingAverage: anOrder "Answer the moving or rolling average for anOrder window" | retval size x y | anOrder <= 0 ifTrue: [ Error signal: 'the order must be positive']. size := self size - anOrder. size negative ifTrue: [ Error signal: 'the collection size is too small']. retval := self species ofSize: size + 1. x := 1. y := anOrder. [y <= self size ] whileTrue: [ retval at: x put: (self copyFrom: x to: y) average x := x + 1. y := y + 1 ]. ^retval Not perfect but seems to works quite well (thatâs probably better to remove copyFrom: and use some kind of buffer instead). Any interest in that ? If any existing code too, Iâll be interested especially for other implementation (weighted, exponential) ? (#(118 113 105 105 103 99 98 101 100 107) movingAverage: 3) collect: [:v | v asScaledDecimal: 1 ] . "an Array(112.0s1 107.7s1 104.3s1 102.3s1 100.0s1 99.3s1 99.7s1 102.7s1)" Cheers, CÃ©drick [1] https://www.meilleursbrokers.com/techniques-de-trading/moyennes-mobiles.html <https://www.meilleursbrokers.com/techniques-de-trading/moyennes-mobiles.html> (in French but is understandable)

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Pharo 8: What is the VM doing when I am doing nothing?
by PBKResearch April 11, 2020

April 11, 2020

Hello. I have noticed a curiosity when I am running Pharo 8 on Windows 10. I am in the habit of leaving the Task Manager open when I am working, and it seems that Pharo 8 is using the CPU when I am doing nothing. When the image - which is exactly as first loaded, with only the welcome window visible - is loaded, CPU consumption is zero. I open a playground, get a list of recent files from the playground cache, open one of the files but do nothing with it; the CPU activity is constantly changing within the range 2.5% - 3.5%. After 5 mins of no Pharo activity by me, the CPU is still in the same range. I reloaded an earlier image, which is Moose Suite 6.1 (Pharo 6) and opened a playground in the same way. After a few seconds, the CPU usage dropped to zero. This activity is a feature of the newest versions only. It's obviously not a major problem, but I would like to know, if just out of curiosity. Thanks for any help. Peter Kenny My Pharo 8 details: Build information: Pharo-8.0.0+build.1124.sha.0932da82f08175e906b0e2a8052120c823374e9f (32 Bit) Installed from Pharo Launcher on 8 Apr 2020 VM details: CoInterpreter * VMMaker-CompatibleUserName.1577968628 uuid: d729bf66-2ea7-5a6d-b1eb-fc005785636d Jan 3 2020 StackToRegisterMappingCogit * VMMaker-CompatibleUserName.1577968628 uuid: d729bf66-2ea7-5a6d-b1eb-fc005785636d Jan 3 2020 VM: 201911290039-dev-7 admin@MacBook-Pro-de-admin.local:dev/Pharo/git-repos/pharo-vm/repo Date: Thu Nov 28 21:39:57 2019 CommitHash: 9b6bd16d3 Plugins: 201911290039-dev-7 admin@MacBook-Pro-de-admin.local:dev/Pharo/git-repos/pharo-vm/repo <mailto:admin@MacBook-Pro-de-admin.local:dev/Pharo/git-repos/pharo-vm/repo>

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April 11, 2020

Hi, Iâm playing with compiler with scripts. For instance: result := OpalCompiler new source: â3 + 1'; evaluate. result2 := OpalCompiler new source: 'self + 1'; receiver: 3; evaluate. I would eventually (as an exercice) try to log the time before and after the execution of the script. Its possible to send #logged: true; to the compiler which basically is able to log doIt through SystemPresenter. logDoIt self compilationContext logged ifFalse: [ ^self ]. Smalltalk globals at: #SystemAnnouncer ifPresent: [ :sysAnn | sysAnn uniqueInstance evaluated: source contents context: context ]. Right now, it seems the logging mechanism is launched once the evaluation is done. So my question is would it be possible to log start and ent time execution through the compiler. OpalCompiler>>evaluate "Compiles the sourceStream into a parse tree, then generates code into a method. If aContext is not nil, the text can refer to temporaries in that context (the Debugger uses this). If aRequestor is not nil, then it will receive a notify:at: message before the attempt to evaluate is aborted. Finally, the compiled method is invoked from here via withArgs:executeMethod:, hence the system no longer creates Doit method litter on errors." | value | self noPattern: true. self getSourceFromRequestorSelection. self class: (context ifNil: [ receiver class ] ifNotNil: [ context method methodClass ]). => here a kind of sell startLog. "code execution" value := receiver withArgs: (context ifNil: [ #() ] ifNotNil: [ {context} ]) executeMethod: self compile. "actual log callâ¦. Only for doIt ?" self logDoIt. ^ value I wonder what would be the way of doing it ? Is it only for doIts ? Start/endLog could be calling log options #(logDoIt, logWhatever, â¦) ? Maybe doing ScriptEvaluated to differ from ExpressionEvaluated would be the solution ? I imagine this has impact on performance too... My toy objective is to log statistic of scripts usage. Again this is just experiments, so happy to hear and learn from others. How would people do ? Cheers, CÃ©drick

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