January 2019 - Pharo-users - lists.pharo.org

Re: [Pharo-users] adding instance variables (data) to the Object class
by Benoit St-Jean Jan. 16, 2019

Jan. 16, 2019

Petr, Since you seem to want to add this (these) extra instance variable(s) in the context of some kind of persistence (objects being retrieved/created from/to some kind of database), perhaps subclassing all your objects from a PersistentObject class (that inherits from Object) would be the simplest solution.

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Re: [Pharo-users] adding instance variables (data) to the Object class
by James Foster Jan. 16, 2019

Jan. 16, 2019

> On Jan 16, 2019, at 6:28 AM, Petr Fischer via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Petr Fischer <petr.fischer(a)me.com> > Subject: Re: [Pharo-users] adding instance variables (data) to the Object class > Date: January 16, 2019 at 6:28:44 AM PST > To: pharo-users(a)lists.pharo.org > > > Yes, due to the object layouts and strong connection of Object with VM, my idea can not be done that easily. > > I want to add some information (instance variables like OID [object id]) to some objects of any kind (some objects = persistent objects). > > I can do it with map (idenity as key, OID + other info as value), but I was afraid that the map would tend to be enormous. > Now (with all your feedback) I am inclined to think that this (map/dictionary) will be the only way. > > Also - on some systems (like Gemstone), there is "dynamic instance variables" (just key/value pairs) and you can add some information to any object instance you want. I like this, but not possible in Pharo, right? While GemStone allows dynamic instance variables on most objects (to support Ruby), it is not allowed on âspecialâ objects like SmallInteger instances that are encoded completely in the OOP. > > Thanks! pf > > >> I am having a little trouble understanding how adding instance >> variables to Object is supposed to work. Where would an immediate >> object like a SmallInteger *put* such variables? What does it even >> *mean* for 0 and 1 to have instance variables? Do you really want >> to give an extra word of storage to *every* object in your system, >> or to just some, but potentially of any kind? >> >> The usual technique is to use something like a WeakIdentityKeyDictionary. >> >> On Mon, 14 Jan 2019 at 13:54, Petr Fischer via Pharo-users < >> pharo-users(a)lists.pharo.org> wrote: >> >>> It looks like I can't simply add statefull trait to the Object like this: >>> >>> ProtoObject subclass: #Object >>> uses: TMyTrait >>> instanceVariableNames: '' >>> classVariableNames: 'DependentsFields' >>> package: 'Kernel-Objects' >>> >>> After this, Pharo 7 VM goes to 100% of CPU usage, several GB of RAM usage >>> and then crash. >>> >>> Or... what do you mean by "talents"? I found also this: >>> https://github.com/tesonep/pharo-talents >>> >>> Thanks, pf >>> >>> >>>> Talents with statefull traits will help you >>>> >>>> Ð¿Ñ, 7 ÑÐµÐ½Ñ. 2018 Ð³., 9:08 Marcus Denker <marcus.denker(a)inria.fr>: >>>> >>>>> >>>>> >>>>> On 6 Sep 2018, at 23:35, Petr Fischer via Pharo-users < >>>>> pharo-users(a)lists.pharo.org> wrote: >>>>> >>>>> >>>>> *From: *Petr Fischer <petr.fischer(a)me.com> >>>>> *Subject: **adding instance variables (data) to the Object class* >>>>> *Date: *6 September 2018 at 23:35:26 CEST >>>>> *To: *pharo-users(a)lists.pharo.org >>>>> >>>>> >>>>> Hello! Weird question: why I can't add instance variables to the Object >>>>> class (for example "oid" or something else)? Is it due to some internal >>>>> (and different) VM "class layouts"? >>>>> >>>>> Or - can I inject my own information to all existing objects (any >>> class)? >>>>> >>>>> >>>>> Behavior is a subclass of Object, too. So that means that you would >>> add a >>>>> ivar to all the classes, but for the VM an object can only be a class >>> that >>>>> has three ivars, and those >>>>> are accessed by offset. So if you add an ivar, you shift the offset â> >>>>> problem. >>>>> >>>>> As for âI want to add object specific stateâ: it would be nice to add >>> an >>>>> easy to use (and efficient) mechanism to do it. >>>>> >>>>> Marcus >>>>> >>> >>> > > > >

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Re: [Pharo-users] adding instance variables (data) to the Object class
by Richard O'Keefe Jan. 16, 2019

Jan. 16, 2019

I am having a little trouble understanding how adding instance variables to Object is supposed to work. Where would an immediate object like a SmallInteger *put* such variables? What does it even *mean* for 0 and 1 to have instance variables? Do you really want to give an extra word of storage to *every* object in your system, or to just some, but potentially of any kind? The usual technique is to use something like a WeakIdentityKeyDictionary. On Mon, 14 Jan 2019 at 13:54, Petr Fischer via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > It looks like I can't simply add statefull trait to the Object like this: > > ProtoObject subclass: #Object > uses: TMyTrait > instanceVariableNames: '' > classVariableNames: 'DependentsFields' > package: 'Kernel-Objects' > > After this, Pharo 7 VM goes to 100% of CPU usage, several GB of RAM usage > and then crash. > > Or... what do you mean by "talents"? I found also this: > https://github.com/tesonep/pharo-talents > > Thanks, pf > > > > Talents with statefull traits will help you > > > > Ð¿Ñ, 7 ÑÐµÐ½Ñ. 2018 Ð³., 9:08 Marcus Denker <marcus.denker(a)inria.fr>: > > > > > > > > > > > On 6 Sep 2018, at 23:35, Petr Fischer via Pharo-users < > > > pharo-users(a)lists.pharo.org> wrote: > > > > > > > > > *From: *Petr Fischer <petr.fischer(a)me.com> > > > *Subject: **adding instance variables (data) to the Object class* > > > *Date: *6 September 2018 at 23:35:26 CEST > > > *To: *pharo-users(a)lists.pharo.org > > > > > > > > > Hello! Weird question: why I can't add instance variables to the Object > > > class (for example "oid" or something else)? Is it due to some internal > > > (and different) VM "class layouts"? > > > > > > Or - can I inject my own information to all existing objects (any > class)? > > > > > > > > > Behavior is a subclass of Object, too. So that means that you would > add a > > > ivar to all the classes, but for the VM an object can only be a class > that > > > has three ivars, and those > > > are accessed by offset. So if you add an ivar, you shift the offset â> > > > problem. > > > > > > As for âI want to add object specific stateâ: it would be nice to add > an > > > easy to use (and efficient) mechanism to do it. > > > > > > Marcus > > > > >

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LOOP book title mismatch
by Richard Kenneth Eng Jan. 16, 2019

Jan. 16, 2019

At http://books.pharo.org/learning-oop/, the title is "Learning Object-Oriented Programming, Design *with* TDD *in* Pharo" but the actual PDF has the title "Learning Object-Oriented Programming, Design *and* TDD *with* Pharo". So which title is correct?

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Re: [Pharo-users] #select was sent to nil
by Andrei Chis Jan. 16, 2019

Jan. 16, 2019

The bug seems to have been introduce in Pharo7.0-SNAPSHOT.build.102.sha.3f660fc.arch.64bit by merging the pull request https://github.com/pharo-project/pharo/pull/1847 On Wed, Jan 16, 2019 at 1:32 AM Hilaire via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > Indeed, seems to only happen in a subclass of BlEement. > > Hilaire > > Le 15/01/2019 Ã 21:33, Andrei Chis a Ã©crit : > > It happens if you create methods in a class having a superclass with > > traits. For example if you create a subclass of BlElement you will get > > this error. > > > > What class are you editing when you get this errror? > > > -- > Dr. Geo > http://drgeo.eu > > > >

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A volunteer is desperately needed
by Richard Kenneth Eng Jan. 16, 2019

Jan. 16, 2019

As you know, the James Robertson Memorial Programming Competition (or JRMPC) is proceeding. You may recall that the decision was made to use VisualWorks for the competition. However, I now realize that it was the wrong decision. VisualWorks presents a number of issues, such as: 1. licensing, esp. to minors (all high school students are minors) 2. awkward installation 3. poor community support â their forum is dead and their mailing list is a PITA to use 4. lack of GitHub support â GitHub rules the programming world now 5. aging IDE and lack of innovation All of this makes for a bad image, which is disastrous from the marketing perspective. David Buck coded the competition in VisualWorks because he wasn't familiar with Pharo. His code is quite functional and he says it's about 80% complete. He started coding just six weeks ago! So the remaining 20% shouldn't be arduous. Here are the things left to do: - complete the OpenGL rendering of the competition and video recording - add code to scan source code submitted by students to prevent malware and cheating - add code to allow full automation of the competition The OpenGL rendering and video recordings will make the competition look much more attractive to the public. This is vital because the competition is a promotional and marketing event, and it has to look really good. I need a Pharo expert to take over from David and convert the code base to Pharo, then finish the remaining 20%. This needs to be done by September. I'd really hate to scrap the project when we've made so much progress already. I just need one Pharoer who truly believes that this marketing event is worthwhile. Please give it serious consideration. Thanks.

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Re: [Pharo-users] #select was sent to nil
by Denis Kudriashov Jan. 15, 2019

Jan. 15, 2019

Hi Hilaire. Can you reproduce it? Ð¿Ð½, 14 ÑÐ½Ð². 2019 Ð³. Ð² 23:24, Hilaire via Pharo-users < pharo-users(a)lists.pharo.org>: > Hi, > > After installing drgeo and save some modification on tonel repo. I got > this persisting error on calypso whatever the button I click on the > browser ui. > > Hilaire > > -- > Dr. Geo > http://drgeo.eu > >

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Re: [Pharo-users] Pier CMS
by Ben Coman Jan. 15, 2019

Jan. 15, 2019

On Tue, 15 Jan 2019 at 22:49, Pierce Ng via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > On Tue, Jan 15, 2019 at 09:08:43AM -0500, Richard Kenneth Eng wrote: > > I'm looking at Pier CMS and it appears to require (32-bit) Pharo 1.3. > Since > > I'm running 64-bit Pharo on 64-bit Linux, this is a problem, am I right? > What features are you looking for? cheers -ben > You can install 32-bit run-time libraries on your 64-bit Linux to run > 32-bit Pharo. I'm still running Pharo 5 and 6 images that way. However, > Pier on Pharo 1.3 is ancient by Internet time scale and you are unlikely > to get much help if/when you run into problems. > > Pierce >

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Pier CMS
by Richard Kenneth Eng Jan. 15, 2019

Jan. 15, 2019

I'm looking at Pier CMS and it appears to require (32-bit) Pharo 1.3. Since I'm running 64-bit Pharo on 64-bit Linux, this is a problem, am I right?

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splitting a string using regex
by Steve Quezadas Jan. 15, 2019

Jan. 15, 2019

I am trying to split a string in pharo using a regular expression. A simple example that works: myString := 'one\n\ntwo\n\n'. myString splitOn: '\n\n'. A simple example that does not work: myString := 'one\n\ntwo\n\n'. re := '\n\n' asRegex. myString splitOn: re. The result of the above is I get the regular old string back ('one\n\ntwo\n\n'). I went through the source code and it should be able to handle a regex object: > "splitter - can be a subsequence, a Block or a Regex (String receiver > only). Any other object used as a splitter is treated as an Array > containing that object." I am baffled as to why it's not working. is there something simple I am missing? - Steve

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