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

Re: [Pharo-users] How does Boolean ifTrue work?

by Nicolas Passerini

Well, in fact Boolean class has no instances, the boolean value true is an instance of True class, you should look at the ifTrue: methods in the subclasses of Boolean True and False. But also, ifTrue: expressions are inlined, as the comment says in the code you posted. So I think that all this ifTrue: methods are never actually executed. 2016-10-31 14:17 GMT+01:00 CodeDmitry <dimamakhnin(a)gmail.com>: > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the > value is > the > false alternative, which is nil. Otherwise answer the result of > evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here > because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated? > > > > > -- > View this message in context: http://forum.world.st/How- > does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by Cyril Ferlicot D.

On 31/10/2016 14:17, CodeDmitry wrote: > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the value is > the > false alternative, which is nil. Otherwise answer the result of evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated? > > Hi! Boolean is only an abstract class. You never manipulate a Boolean, you manipulate True or False. The #ifTrue: method works with a dispatch between True and False. Try to check: `True browse` or `False browse` :) > > > -- > View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > -- Cyril Ferlicot http://www.synectique.eu 2 rue Jacques PrÃ©vert 01, 59650 Villeneuve d'ascq France

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by Sven Van Caekenberghe

> On 31 Oct 2016, at 14:17, CodeDmitry <dimamakhnin(a)gmail.com> wrote: > > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the value is > the > false alternative, which is nil. Otherwise answer the result of evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated? In the sub classes of Boolean, True and False. Have a look at ALL implementors of #ifTrue: or #ifFalse: There is only one instance of True, the constant true, same for False and false. HTH, Sven > > > > -- > View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >

Oct. 31, 2016

Re: [Pharo-users] How does Boolean ifTrue work?

by CodeDmitry

Wait, so unlike JavaScript; True and False are actual singletons and ifTrue/ifFalse/ifTrue:ifFalse: uses visitor pattern to have the actual True or False handle the block rather than doing it themselves? -- View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873p4920878.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Oct. 31, 2016

How does Boolean ifTrue work?

by CodeDmitry

I am looking at ifTrue: alternativeBlock "If the receiver is false (i.e., the condition is false), then the value is the false alternative, which is nil. Otherwise answer the result of evaluating the argument, alternativeBlock. Create an error notification if the receiver is nonBoolean. Execution does not actually reach here because the expression is compiled in-line." self subclassResponsibility In order to perform the block, ifTrue must somehow end up evaluating the block, but this code only sends a subclassResponsibility message to itself and implicitly returns itself. Where does the block actually get evaluated? -- View this message in context: http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Oct. 31, 2016

UDP Socket primitive failure

by Dimitris Chloupis

Hey guys I try to use Pharo to use Supercollider via OSC. OSC library is maintained by Stef in STHub. So SC informs that it receives the messages sent, but in Pharo I am getting annoying Primitive errors that I paste bellow. Anyone knows if this a bug or something missing here ? Also SC sometimes it informs me that the message was received in a different port than it was sent. Here the code I am using (OSCMessage for:{'/mixer.volume'. 1 . 0.2})sendTo: '127.0.0.1' port: 57120. Any help greatly appreciated. Supercollider is an application which is basically a server written in C++ that does music composition and audio synthesis live , its extremely powerful and the top professional audio tool for audio synthesis and music live coding. http://supercollider.github.io Socket(Object)>>primitiveFailed: Socket>>errorSending:startingAt:count:toHost:port: Socket>>primSocket:sendUDPData:toHost:port:startIndex:count: Socket>>sendUDPData:toHost:port: OSCMessage(OSCPacket)>>sendTo:port: UndefinedObject>>DoIt OpalCompiler>>evaluate RubSmalltalkEditor>>evaluate:andDo: RubSmalltalkEditor>>highlightEvaluateAndDo: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] in [ textMorph textArea handleEdit: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] ] in GLMMorphicPharoScriptRenderer(GLMMorphicPharoCodeRenderer)>>actOnHighlightAndEvaluate: in Block: [ textMorph textArea editor highlightEvaluateAndDo...etc... RubEditingArea(RubAbstractTextArea)>>handleEdit: [ textMorph textArea handleEdit: [ textMorph textArea editor highlightEvaluateAndDo: ann action. textMorph shoutStyler style: textMorph text ] ] in GLMMorphicPharoScriptRenderer(GLMMorphicPharoCodeRenderer)>>actOnHighlightAndEvaluate: in Block: [ textMorph textArea... WorldState>>runStepMethodsIn: WorldMorph>>runStepMethods WorldState>>doOneCycleNowFor: WorldState>>doOneCycleFor: WorldMorph>>doOneCycle [ [ World doOneCycle. Processor yield. false ] whileFalse: [ ] ] in MorphicUIManager>>spawnNewProcess in Block: [ [ World doOneCycle.... [ self value. Processor terminateActive ] in BlockClosure>>newProcess in Block: [ self value....

Oct. 31, 2016

Re: [Pharo-users] Spec: Setting rows height of a pictures list

by Nicolai Hess

2016-10-31 10:19 GMT+01:00 Matteo via Pharo-users < pharo-users(a)lists.pharo.org>: > > > ---------- Weitergeleitete Nachricht ---------- > From: Matteo <matteob8(a)yahoo.it> > To: "Pharo is welcome (ML)" <pharo-users(a)lists.pharo.org> > Cc: > Date: Mon, 31 Oct 2016 10:18:03 +0100 > Subject: Spec: Setting rows height of a pictures list > Hi, > I've created a list of pictures, i.e. a widget based on ListModel > where > each item is a ImageModel. > > When the widget is displayed I get list window with very thin rows. > > Is there a way to control the ListModel rows height? > Not if the images have different heights (you can, but it looks terrible, because the underlaying list morph does not work for list items with different heights). > > > Thanks, > Matteo > > >

Oct. 31, 2016

Spec: Setting rows height of a pictures list

by Matteo

Hi, I've created a list of pictures, i.e. a widget based on ListModel where each item is a ImageModel. When the widget is displayed I get list window with very thin rows. Is there a way to control the ListModel rows height? Thanks, Matteo

Oct. 31, 2016

Re: [Pharo-users] [vwnc] small examples to show the tools

by Dimitris Chloupis

When I made the presentation in the Greek Hackespace in Athens, I tried to illustrate how Smalltalk is a live organism. Took me 10 minutes to do that. The rest, 20 minutes, was spent with me debugging the GUI of ChronosManager, I inserted a bug and show how I fixed it without the GUI stoping and of course demonstrated the use of halos and the inspector. On Sun, Oct 30, 2016 at 8:52 PM Richard Sargent <rsargent(a)5x5.on.ca> wrote: > For the idea of transferring the code to another image, look at Dale's > work with "server blocks" between Pharo and GemStone/S. > > There is also his work which builds on this called Tugrik. > > > ------------------------------ > From: Christian Haider <christian.haider(a)smalltalked-visuals.com> > Sent: â2016-â10-â30 00:39 > To: vwnc(a)lists.cs.illinois.edu; pharo-users(a)lists.pharo.org > Subject: [vwnc] small examples to show the tools > > Hi all, > > > > in two weeks, I am going to give a little talk about Smalltalk: > http://metameute.de/nook2016/ > <https://urldefense.proofpoint.com/v2/url?u=http-3A__metameute.de_nook2016_&…> > . > > It is 45 min with students who probably never heard of Smalltalk. > > I want to concentrate on the liveliness of the environment with the tools: > Workspace, Inspector, Browser and Debugger. > > > > For this, I need a simple but nice example. > > > > I will use VisualWorks 8.2 and Mirko, a new Smalltalk lover, will use > Pharo 5. > > We want to have the computers connected, maybe also a Pi, to show the > platform independence of the image concept. > > > > The first idea was a chat client. A client and a server in one image. Then > in two images on one machine, on two machines (also the Pi), maybe in two > dialects (VW, Pharo). > > Possible to transfer code (blocks) across images (that should blow their > minds J). > > This is cool, but I am not sure if this is not too much and distracting > with other technologies. > > > > Another is to read a csv file or web service and parse it into objects. > With the right kind of cool data it is fun to mold these objects for the > tools. > > This not so sexy, but easy to do from scratch. Unfortunately, the > different computers would not play a role. > > > > As you see, I am a bit lost and wanted to ask you guys for ideas. > > > > Happy hacking, > > Christian > > > > P.S. Here in LÃ¼beck, a town in northern Germany, the attitude towards > Smalltalk is generally positive, interested and curious. Maybe it is time > for a Smalltalk renaissance? >

Oct. 30, 2016

Re: [Pharo-users] [ANN] Pharo By Example 5.0

by Dimitris Chloupis

are you asking me a question or request ? On Sun, Oct 30, 2016 at 11:39 PM stepharo <stepharo(a)free.fr> wrote: > I'm looking for the > > figures/workspaceInspector.png > > Because I pulled and I cannot latex anymore. > > I'm working on the web site: http://books.pharo.org to get > > all the book pdfs in a well defined place (and all the rest). > > all the pointer to git hub > > all the pointer to the jenkins server. > > Stef > > Le 29/10/16 Ã 20:45, Dimitris Chloupis a Ã©crit : > > I forgot to add that the final render of the book cover can be found here > > > https://gitlab.com/Kilon/pbe5-cover/raw/master/Pharo%20demo/renders/render-… > > have fun :) > > On Sat, Oct 29, 2016 at 9:38 PM Dimitris Chloupis <kilon.alios(a)gmail.com> > wrote: > > As promised I released PBE5.0 just now, which basically puts a tag to our > github repository to mark the beginning of version 5 and also provided a > release in a fork of separate downloads for the book and the repository > itself which anything that is required to build the book. > > If you want just to read , downloading the pdf is enough. You can get the > release from here > > > https://github.com/SquareBracketAssociates/UpdatedPharoByExample/releases/t… > > Unfortunately I was not able to port the Reflection chapter , it needs a > ton of work , probably a complete rewrite but since its a late chapter and > we already have achieved a 80% updating I think it was the right time now > that pharo 7 is starting developing . > > Still till PBE6.0 we have a long way to go but I think we can get there > far easier than we got from PBE1.4 to PBE5.0. > > The rest of the details are in the link. > > Salute to fellow Guardians of the Light :) > > >

Oct. 30, 2016