May 2016 - Pharo-users - lists.pharo.org

Can you help me find this info?
by Victor RENE May 4, 2016

May 4, 2016

Hello, I am new to Pharo and would like to understand a few things. I can search by myself, but I do not know the code base yet, so: [Questions] Pharo image: Serialization, deserialization, where is the code? Pharo vm (Cog/Spur): Rendering loop and event loops. done with SDL2, where is the code? Message passing, object hierarchy lookup, where is the code? Pharo minimal: How to get a working version? The builds I tried (4.0) crashed. [Purpose] My goal is work out an image/vm with minimum overhead. For example, let's say I want to build a modern multi-touch application. Pharo's environment looks promising on the live coding/debugging side, but what about the performance? Lack of responsiveness would not be acceptable (think about design differences between Android/iOS). [Context] I want to understand if the object oriented nature of Smalltalk is the reason for the lack of apps of this nature (as far as I can tell). For example, games have been done with Lisp: Jack and Daxter (on the PS2, by Naughty Dogs). There are also game engines for the JVM (https://www.lwjgl.org/) Dedicated hardware has been built for either Lisp or Forth. I can't seem to find any hardware built specifically to power Smalltalk software. Yet as far as I can tell, it's the big time for software virtual machines, because the new generation of hardware will be supporting them. (https://news.ycombinator.com/item?id=10032295) UPDATE: I am reading through "Evaluating message passing control techniques in Smalltalk" (https://www.researchgate.net/publication/2440118_Evaluating_Message_Passing…) I am getting a better picture of the whole, please direct to more such papers. Thanks, Victor RENESoftware engineer,Game designer, Writer Blog: http://victor-rene.comProjects: http://logiqub.com tel: +33 6 26 83 61 76email: victor-rene(a)outlook.com

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[Post] adding custom method icons
by Peter UhnÃ¡k May 4, 2016

May 4, 2016

Hi, if you wondered how you can add your own method icon/action to Nautilus, well wonder no more. :) â http://peteruhnak.com/blog/2016/05/04/custom-method-icons/ Peter

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Metaprogramming facilities
by Victor RENE May 3, 2016

May 3, 2016

In the TinyBlog mini-project of the MOOC, we start by creating the model. However, since I basically finished the exercises, I wanted to go one step further and ask you guys, what is the correct way _not_ to write all gettters / setters for the fields. TBPost >> title ^ title TBPost >> title: anObject title := anObject TBPost >> text ^ text TBPost >> text: anObject text := anObject etc... Do you do it with macros / templates / something else ? I am having a bit of fun (although I would love that they unlock weeks 2 to 7 for me). Thanks in advance. Victor RENESoftware engineer,Game designer, Writer Blog: http://victor-rene.comProjects: http://logiqub.com tel: +33 6 26 83 61 76email: victor-rene(a)outlook.com

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[ANN] EventRecorder updated (import/export)
by Torsten Bergmann May 3, 2016

May 3, 2016

Hi, I forgot to mention that for "EventRecorder" there was another pass on the code together with Peter Uhnak. It is now possible to import/export the recordings again and also the UI was updated accordingly (see attached screenshot) Works in Pharo 5.0 - you can load the tool from Catalog or by opening Spotter and entering "EventRecorder". Have fun T.

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Help me make sense of this (AST manipulation)
by Victor RENE May 3, 2016

May 3, 2016

| f g h | f := '[ :a | ^a + 1 ].'. " Message pattern expected " g := '| b |'. " '|' expected " h := '| b ||'. " Success?!? " OpalCompiler compile: f. OpalCompiler compile: g. OpalCompiler compile: h. Basically I went from writing a function to clean up StringMorphs on the World... cleanupStringMorph "Clean up string morph in world." | x y | x := World submorphs. y := [ x select: [ :each | (each isMemberOf: StringMorph) ] ]. y value do: [ :each | each delete ]. Smalltalk garbageCollect. ...to wondering how to generalize the idea (pass the class as an argument)... ...but that would be too easy, so why not manipulate the AST programatically... I read https://marcusdenker.de/publications/Bera13a-OpalIWST.pdf but the compiler thinks I am a fool :-( My guess is I need to know what are the method calls from text to AST to bytecode. Any idea? Victor RENESoftware engineer,Game designer, Writer Blog: http://victor-rene.comProjects: http://logiqub.com tel: +33 6 26 83 61 76email: victor-rene(a)outlook.com

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RT export to PDF
by Arturo Zambrano May 2, 2016

May 2, 2016

Hi, I'm using RT on top of pharo5. As I need to export to pdf, I also installed RTPDFExporter and Artefact development versions Exporting to pdf fails with MNU RTPDFVisitor>>visitMapShape: any hint regarding this? cheers, arturo

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What other languages can do something similar?
by Jimmie Houchin May 2, 2016

May 2, 2016

While working on a project I made a mistake in some code. A common mistake in most languages, a less common one in Smalltalk or Pharo. Something similar to the below. foreverTrue | index end | [ index < end ] whileTrue: [ "Do something clever. But forget to increment index." ]. ^ returnSomething I can execute foreverTrue in a Playground and when nothing returns in an appropriate amount of time. I can stop the execution. Fix the bug. Try again. I lose nothing. All my data, all my image state is still there. I do not have to do anything special to execute foreverTrue again, but now successfully so. Because Pharo/Smalltalk is so much more than just a programming language, this is possible. Most languages I know you would have to kill the vm and start all over. I would have to do everything I had already done to get to the correct state in order to execute my method. I guess many static languages might catch the bug and not allow execution. But I have no experience there. I was just curious as to what other languages, environments might survive my mistake and allow me to gracefully correct and continue. I think this one of the big wins for Pharo/Smalltalk. We can sometimes mess up and recover gracefully. I think small things like this should possibly be collected in a document as to some reasons for Pharo. Thanks. Jimmie

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Best way to clear the Transcript?
by phil＠highoctane.be May 2, 2016

May 2, 2016

I am looking for a way to clear the Transcript. There is no direct command like Transcript clear available. I do not want to reopen a new one, just be able to clear one with code, so that I can leave the window placed properly where I want it. TIA Phil

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Machine learning in Pharo
by Andy Burnett May 1, 2016

May 1, 2016

Are there any ML libraries in Pharo? I want to build a document classifier for the contents of an RSS feed. I was hoping to try this in Pharo. Cheers Andy

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Create BaselineOf from ConfigurationOf
by Sean P. DeNigris May 1, 2016

May 1, 2016

I got tired of manually converting Configs into Baselines, so I wrote a little script. You pass it the selector of a #baselineXyz: method, and it converts it (i.e. changes the pragma, removes the blessing and repo, etc) Hopefully you will find it useful. Cross posting to Metcello list... ConfigurationOf>>#createBaselineFrom: selector | projectName baselineName baseline methodTree commonBlockBody repoSetter | "Create new class" projectName := self name allButFirst: self superclass name size. baselineName := 'BaselineOf', projectName. baseline := BaselineOf subclass: baselineName asSymbol instanceVariableNames: '' classVariableNames: '' category: baselineName. "Convert baseline##: method" methodTree := (self methodNamed: selector) parseTree. methodTree selector: #baseline:. methodTree pragmas at: 1 put: (RBPragmaNode selector: #baseline arguments: #()). commonBlockBody := methodTree statements first arguments last body. repoSetter := commonBlockBody statements detect: [ :e | e selector = #repository: ]. commonBlockBody removeNode: repoSetter. "Compile baseline method" baseline compile: methodTree newSource classified: 'baseline' ----- Cheers, Sean -- View this message in context: http://forum.world.st/Create-BaselineOf-from-ConfigurationOf-tp4893076.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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