July 2018 - Pharo-users - lists.pharo.org

Re: [Pharo-users] transactions on pharo objects

by Esteban A. Maringolo

I think it is a tricky thing to do "in memory transactions", even without thinking about databases. You have to define what to keep and where to place the "original" values (inst. vars.) of the object. As a general purpose solution if you can do that, you end up implementing a mini gemstone in Pharo :) But what's sure is that you should have a mini object-table of the "touched" objects or do "explicit" registration of these objects like GLORP allows you to do. e.g. | p | p := Person new. System transaction: [:tx | tx register: p. p name: 'Nobody'. p age: 70. ]. self assert: p name equals: 'Nobody'. self assert: p age equals: 70. I'm using System here, to make it compatible with GemStone. #transaction: could be implemented in terms of #beginTransaction, #commitTransaction and internally use #abortTransaction if an unhandled Error is signalled. Regards! Esteban A. Maringolo El lun., 30 jul. 2018 a las 10:17, Peter UhnÃ¡k (<i.uhnak(a)gmail.com>) escribiÃ³: > > Hi, > > is there some library or approach how to do transactions in pharo? > And I don't mean database transactions, but directly in memory on Pharo objects... e.g. > > p := Person new. > > transaction do: [ > p name: 'Nobody'. > p age: 70. > ] on: Error do: [ > transaction rollback. > ]. > > self assert: p name equals: 'Nobody'. > self assert: p age equals: 70. > > transaction do: [ > p name: 'Somebody'. > p age: 1 / 0. > ] on: Error do: [ > transaction rollback. > ]. > > self assert: p name equals: 'Nobody'. > self assert: p age equals: 70. > > Any pointers appreciated. > > Thanks, > Peter

July 30, 2018

transactions on pharo objects

by Peter UhnÃ¡k

Hi, is there some library or approach how to do transactions in pharo? And I don't mean database transactions, but directly in memory on Pharo objects... e.g. p := Person new. transaction do: [ p name: 'Nobody'. p age: 70. ] on: Error do: [ transaction rollback. ]. self assert: p name equals: 'Nobody'. self assert: p age equals: 70. transaction do: [ p name: 'Somebody'. p age: 1 / 0. ] on: Error do: [ transaction rollback. ]. self assert: p name equals: 'Nobody'. self assert: p age equals: 70. Any pointers appreciated. Thanks, Peter

July 30, 2018

Re: [Pharo-users] a basic hash question

by James Foster

Werner, I would say that you are right, this is a problem. A (not un-common) source of subtle bugs in Smalltalk is missing this rule that equivalent objects must have the same hash. In GemStone the objects are not equivalent (Iâm not arguing that this is right, just that it avoids the problem you identify). I wonder what would happen if the hash comparison were added to the equivalence operator (#â=â)! James > On Jul 30, 2018, at 5:07 AM, werner kassens <wkassens(a)libello.com> wrote: > > Hi, > i guess i can subsume almost everything i know about hashes in one sentence: > it is my understanding that two objects that are equal (obj1=obj2. > -->true) have to have the same hash value (which is used for some > collection types), whereas objects where obj1=obj2 returns false should > have different hash values although it may happen that they have the > same one. > > now here things don't turn out exactly like that: > (1 to:4) = #(1 2 3 4). "true" > (1 to:4)hash = #(1 2 3 4)hash. "false" > well ok, actually these results make - pfffh, in a certain way - sense > to me, but i wonder what arguments the people in the know would use to > defend that result, if i would have another opinion? > werner > > >

July 30, 2018

Re: [Pharo-users] a basic hash question

by CÃ©drick BÃ©ler

But it raises the question if : (1 to:4)hash = #(1 2 3 4)hash should return true instead ?? Cedrick > Le 30 juil. 2018 Ã 14:51, CÃ©drick BÃ©ler <cdrick65(a)gmail.com> a Ã©crit : > > Just a quick guess seeing the implementation > > hash for collections is about hash of its elements > > SequencableCollection>>hasEqualElements: otherCollection > "Answer whether the receiver's size is the same as otherCollection's > size, and each of the receiver's elements equal the corresponding > element of otherCollection. > This should probably replace the current definition of #= ." > > | size | > (otherCollection isKindOf: SequenceableCollection) ifFalse: [^ false]. > (size := self size) = otherCollection size ifFalse: [^ false]. > 1 to: size do: > [:index | > (self at: index) = (otherCollection at: index) ifFalse: [^ false]]. > ^ true > > Cheers, > > CÃ©drick > >> Le 30 juil. 2018 Ã 14:07, werner kassens <wkassens(a)libello.com> a Ã©crit : >> >> Hi, >> i guess i can subsume almost everything i know about hashes in one sentence: >> it is my understanding that two objects that are equal (obj1=obj2. >> -->true) have to have the same hash value (which is used for some >> collection types), whereas objects where obj1=obj2 returns false should >> have different hash values although it may happen that they have the >> same one. >> >> now here things don't turn out exactly like that: >> (1 to:4) = #(1 2 3 4). "true" >> (1 to:4)hash = #(1 2 3 4)hash. "false" >> well ok, actually these results make - pfffh, in a certain way - sense >> to me, but i wonder what arguments the people in the know would use to >> defend that result, if i would have another opinion? >> werner >> >> >

July 30, 2018

Re: [Pharo-users] a basic hash question

by CÃ©drick BÃ©ler

Just a quick guess seeing the implementation hash for collections is about hash of its elements SequencableCollection>>hasEqualElements: otherCollection "Answer whether the receiver's size is the same as otherCollection's size, and each of the receiver's elements equal the corresponding element of otherCollection. This should probably replace the current definition of #= ." | size | (otherCollection isKindOf: SequenceableCollection) ifFalse: [^ false]. (size := self size) = otherCollection size ifFalse: [^ false]. 1 to: size do: [:index | (self at: index) = (otherCollection at: index) ifFalse: [^ false]]. ^ true Cheers, CÃ©drick > Le 30 juil. 2018 Ã 14:07, werner kassens <wkassens(a)libello.com> a Ã©crit : > > Hi, > i guess i can subsume almost everything i know about hashes in one sentence: > it is my understanding that two objects that are equal (obj1=obj2. > -->true) have to have the same hash value (which is used for some > collection types), whereas objects where obj1=obj2 returns false should > have different hash values although it may happen that they have the > same one. > > now here things don't turn out exactly like that: > (1 to:4) = #(1 2 3 4). "true" > (1 to:4)hash = #(1 2 3 4)hash. "false" > well ok, actually these results make - pfffh, in a certain way - sense > to me, but i wonder what arguments the people in the know would use to > defend that result, if i would have another opinion? > werner > >

July 30, 2018

a basic hash question

by werner kassens

Hi, i guess i can subsume almost everything i know about hashes in one sentence: it is my understanding that two objects that are equal (obj1=obj2. -->true) have to have the same hash value (which is used for some collection types), whereas objects where obj1=obj2 returns false should have different hash values although it may happen that they have the same one. now here things don't turn out exactly like that: (1 to:4) = #(1 2 3 4). "true" (1 to:4)hash = #(1 2 3 4)hash. "false" well ok, actually these results make - pfffh, in a certain way - sense to me, but i wonder what arguments the people in the know would use to defend that result, if i would have another opinion? werner

July 30, 2018

Re: [Pharo-users] Morph reacting to Window being closed

by Henrik-Nergaard

Hi Peter, There are two methods which can be used for this purpose. #outOfWorld: #announceDeleted Both are called recursively down the morph tree from the window. If you need to stop the window or provide a dialog then you should create a subclass of Model and use that to keep references to things that need cleanup and control the closing and other events. Best regards, Henrik -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 29, 2018

Re: [Pharo-users] [ANN] Pharo Git Thermite Release

by Andrew Black

Hi Ronie, These visualizations look great! But I donât know what they mean. When one hovers the mouse over the visualizations, does help text appear explaining what one is looking at? For example, I guess that the red and green segments in âLines of Codeâ refer to lines deleted and added. But what are the green and yellow for âClassesâ. And whatâs a âFunctionâ in Pharo? The more complicated diagram for âRoassal2â I canât even begin to guess at! Donât make the mistake of thinking that because you know what the diagram means, after working on it for months, that other programmers will also know. Andrew

July 29, 2018

Re: [Pharo-users] Morph reacting to Window being closed

by Hilaire

Hi Peter, I think you have two options: 1. Specialize the Window and use your own delete method to do your additional cleaning. This is what I do in Dr. Geo. 2. Use the WindowClosed announcement from system window to catch the signal from the morph you want to clean Hilaire Le 29/07/2018 Ã 13:35, Peter UhnÃ¡k a Ã©critÂ : > how can a Morph react to its parent window being closed? > > E.g. > > Morph subclass: #MyMorph. > MyMorph new openInWindow > > how can MyMorph cleanup itself on window close? > > I thought Morph>>delete would do the trick, but it is not being called. > > Thanks, > Peter -- Dr. Geo http://drgeo.eu

July 29, 2018

Morph reacting to Window being closed

by Peter UhnÃ¡k

Hi, how can a Morph react to its parent window being closed? E.g. Morph subclass: #MyMorph. MyMorph new openInWindow how can MyMorph cleanup itself on window close? I thought Morph>>delete would do the trick, but it is not being called. Thanks, Peter

July 29, 2018

Re: [Pharo-users] Jupyter notebooks / Dynabook / JupyterTalk

by Serge Stinckwich

On Sat, Jul 28, 2018 at 11:21 AM H. Hirzel <hannes.hirzel(a)gmail.com> wrote: > Hello > > What is the status of this project? > > > https://github.com/jmari/JupyterTalk > > âYou can ask the author of the software, Jesus Mari Aguirre. He is quite active. W âe talk together about be able to use Jupytalk with Tensorflow and PolyMath. He was able to reproduce part of my talk about Tensorflow: https://htmlpreview.github.io/?https://github.com/jmari/JupyterTalk/blob/ma… -- Serge Stinckwich UMI UMMISCO 209 (SU/IRD/UY1) "Programs must be written for people to read, and only incidentally for machines to execute."http://www.doesnotunderstand.org/

July 28, 2018

Re: [Pharo-users] [Pharo-dev] [ANN] Pharo Git Thermite Release

by peter yoo

Wow!! so great!!!

July 28, 2018

Re: [Pharo-users] Monticello default repositories & Iceberg

by Tim Mackinnon

Yeah - I had a similar problem and had forgotten that the global startup settings are applied every tine you launch an image. Not at my computer - but on OS X they are in the is Library subfolder, on Windows there is some profile directories. Tim Sent from my iPhone > On 28 Jul 2018, at 03:13, Sean P. DeNigris <sean(a)clipperadams.com> wrote: > > Evan Donahue wrote >> I see a "default local repository" and a "local cache directory" that >> point to old obsolete paths >> from years ago on my machine. > > Could this be the result of an obsolete startup script? > > > > ----- > Cheers, > Sean > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >

July 28, 2018

Jupyter notebooks / Dynabook / JupyterTalk

by H. Hirzel

Hello What is the status of this project? https://github.com/jmari/JupyterTalk Hannes

July 28, 2018

Re: [Pharo-users] OmniBase for Pharo 6

by PBKResearch

Marco Thanks again. I was apprehensive about using OmniBase for real. With all green tests I am much happier. Peter Kenny -----Original Message----- From: Pharo-users <pharo-users-bounces(a)lists.pharo.org> On Behalf Of marco Sent: 27 July 2018 14:51 To: pharo-users(a)lists.pharo.org Subject: Re: [Pharo-users] OmniBase for Pharo 6 Peter, yes, tested windows (10) and unix/linux (32-bit). It works, green light. With the 2010 "fix" at least the garbage collection will not work on any OS. The logic tries to lock the same file twice. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 28, 2018

Re: [Pharo-users] Monticello default repositories & Iceberg

by Sean P. DeNigris

Evan Donahue wrote > I see a "default local repository" and a "local cache directory" that > point to old obsolete paths > from years ago on my machine. Could this be the result of an obsolete startup script? ----- Cheers, Sean -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 28, 2018

Monticello default repositories & Iceberg

by Evan Donahue

I am using Pharo Launcher. Currently, if I create a new image and go to Settings > Software Configuration > Monticello, I see a "default local repository" and a "local cache directory" that point to old obsolete paths from years ago on my machine. As a result, I'm having trouble using iceberg through metacello, because it keeps looking for baselines in these old paths and crashing. What should those paths be for Pharo launcher? Does it use one default path for all images, or is there a way to tell it to change the default cache for each new image? Thanks, Evan

July 27, 2018

Re: [Pharo-users] Tracing Method Calls

by Steven Costiou

Hi, it may not be actively maintained but Phantom has recently been ported to Pharo 6/6.1 https://github.com/InesSosa95/PHANtom You could also use Reflectivity (look for MetaLink class), which should not be hard to understand if you are familiar with aspects (although that is not aspects). For example, if you wanted to trace the receivers and parameters of a method named #mWithArg1:withArg2:withArg3: in class C, you could do : |link| link := MetaLink new. link control: #before. link arguments: #(#receiver #arguments). link metaObject: YourMetaObject. link selector: #yourMethodWithArg1:andArg:. (C lookupSelector: #mWithArg1:withArg2:withArg3:) ast link: link YourMetaObject is here an object which will receive the yourMethodWithArg1:andArg: with as arguments the receiver of the method #mWithArg1:withArg2:withArg3: and its arguments as an array. It could be a block with 2 arguments, or any other object that you would use to implement your trace behavior. You have a number of reifications available that you can pass as arguments from the context, look for subclasses of RFReification. Steven. Le 2018-07-27 17:25, Arturo Zambrano a Ã©crit : > Hi all, > I have a piece of undocumented software that I need understand ... One thing I would like to do is to have a complete trace of method calls (receivers, parameters) for certain scenarios. > As an "aspects"guy, my first idea was to use Phantom, but it seems not active anymore. > > Could someone please point me to some tools that I could use for this? (using Pharo 6, 6.1 or 7) > > Thanks in advance > > Cheers > Arturo

July 27, 2018

Re: [Pharo-users] [Pharo-dev] [ANN] Pharo Git Thermite Release

by Arturo Zambrano

This sounds great! I need to use something like this now. I will make questions ;-) and provide feedback On Tue, Jul 17, 2018 at 10:28 PM Alexandre Bergel via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > It would be fantastic that people try it out. It is easy to use, and is > really a big improvement over the tool set we use. > > And getting feedback is important. > > Cheers, > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > > On Jul 17, 2018, at 11:08 AM, Ronie Salgado <roniesalg(a)gmail.com> wrote: > > Hello, > > I am finally releasing an initial public version of Pharo Git Thermite, a > tool that I am developing as part of my master thesis for visualizing > Monticello and Git commits, for Pharo and Python: > > GitHub Page with sources/documentation/issue tracker: > https://github.com/ronsaldo/pharo-git-thermite > > Short video examples: > - Monticello Visualization; https://youtu.be/02CUHBmm-K8 > - GitHub pull request: https://youtu.be/f196btLfYxM > - Local git commit: https://youtu.be/LCHTiJ4nx3g > > Feedback form: > https://docs.google.com/forms/d/e/1FAIpQLSeir6VlE3bR78oRsNAp9eHLkUn2Q016wEl… > > Best regards, > Ronie > > <thermite-visualization.png> > > >

July 27, 2018

Tracing Method Calls

by Arturo Zambrano

Hi all, I have a piece of undocumented software that I need understand ... One thing I would like to do is to have a complete trace of method calls (receivers, parameters) for certain scenarios. As an "aspects"guy, my first idea was to use Phantom, but it seems not active anymore. Could someone please point me to some tools that I could use for this? (using Pharo 6, 6.1 or 7) Thanks in advance Cheers Arturo

July 27, 2018

Re: [Pharo-users] Working with urls that contain non latin characters

by Sven Van Caekenberghe

> On 27 Jul 2018, at 15:25, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > Right, but that guess is wrong (check the resulting string). Actually, the encoding used is GBK, https://en.wikipedia.org/wiki/GBK_(character_encoding) This is a variable length encoding used in China. It is not currently implemented (but could be added). But even if we implemented it, it would not solve the current issue (we would not known that we had to use it).

July 27, 2018

Re: [Pharo-users] OmniBase for Pharo 6

by marco

Peter, yes, tested windows (10) and unix/linux (32-bit). It works, green light. With the 2010 "fix" at least the garbage collection will not work on any OS. The logic tries to lock the same file twice. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

July 27, 2018

Re: [Pharo-users] Working with urls that contain non latin characters

by Sven Van Caekenberghe

> On 27 Jul 2018, at 13:58, Ben Coman <btc(a)openinworld.com> wrote: > > On 27 July 2018 at 18:39, Offray Vladimir Luna CÃ¡rdenas > <offray.luna(a)mutabit.com> wrote: >> Hi, >> >> I was ready to show a friend the Pharo web capabilities with the >> classical "myString asUrl retrieveContents", but the friend gave me a >> url that contains non Latin characters[1] and then I got an >> ZnInvalidUTF8 error. >> >> [1] >> http://www.bidchance.com/freesearch.do?&filetype=&channel=&currentpage=1&se… >> >> How can I process web addresses in Pharo that contain non latin >> characters like the one in [1]? > > Just some blind digging... > > A few levels down the stack is a call equivalent to... > x := '%BF%A6%CA%B2'. > ZnPercentEncoder new decode: x. > which fails with the same error. > > In #decode we have... > bytes := #[191 166 202 178]. Correct (as it is not legal UTF-8) > and browsing around I discovered a useful method... > encoder := ZnCharacterEncoder detectEncoding: bytes > "==> a ZnSimplifiedByteEncoder('iso88591' strict)" > > now the following works... > (ZnPercentEncoder new characterEncoder: encoder ) decode: x. Right, but that guess is wrong (check the resulting string). Since we are talking about Chinese characters that are outside the allowed range for #iso88591 (#latin1), that is logical. Clearly, the original website http://www.bidchance.com knows the encoding ... Again, to my understanding, without further context, when %BF%A6%CA%B2 is encountered in the query part of a URL, it is first percent decoded, then UTF-8 decoded. That is what #asUrl assumes, and which leads to the error since that particular sequence, when interpreted like that, does not constitute a legal UTF-8 encoding. > So maybe that helps explain it, > but I don't know how to join the dots to make it work out of the box > with "asUrl retrieveContents" > > cheers -ben

July 27, 2018

Re: [Pharo-users] Working with urls that contain non latin characters

by Ben Coman

On 27 July 2018 at 18:39, Offray Vladimir Luna CÃ¡rdenas <offray.luna(a)mutabit.com> wrote: > Hi, > > I was ready to show a friend the Pharo web capabilities with the > classical "myString asUrl retrieveContents", but the friend gave me a > url that contains non Latin characters[1] and then I got an > ZnInvalidUTF8 error. > > [1] > http://www.bidchance.com/freesearch.do?&filetype=&channel=&currentpage=1&se… > > How can I process web addresses in Pharo that contain non latin > characters like the one in [1]? Just some blind digging... A few levels down the stack is a call equivalent to... x := '%BF%A6%CA%B2'. ZnPercentEncoder new decode: x. which fails with the same error. In #decode we have... bytes := #[191 166 202 178]. and browsing around I discovered a useful method... encoder := ZnCharacterEncoder detectEncoding: bytes "==> a ZnSimplifiedByteEncoder('iso88591' strict)" now the following works... (ZnPercentEncoder new characterEncoder: encoder ) decode: x. So maybe that helps explain it, but I don't know how to join the dots to make it work out of the box with "asUrl retrieveContents" cheers -ben

July 27, 2018

Re: [Pharo-users] Working with urls that contain non latin characters

by Sven Van Caekenberghe

Hi Offray, > On 27 Jul 2018, at 12:39, Offray Vladimir Luna CÃ¡rdenas <offray.luna(a)mutabit.com> wrote: > > Hi, > > I was ready to show a friend the Pharo web capabilities with the > classical "myString asUrl retrieveContents", but the friend gave me a > url that contains non Latin characters[1] and then I got an > ZnInvalidUTF8 error. > > [1] > http://www.bidchance.com/freesearch.do?&filetype=&channel=&currentpage=1&se… > > How can I process web addresses in Pharo that contain non latin > characters like the one in [1]? I am on holiday, so I cannot go too deep into this, but AFAIU the URL is wrong (or it assumes a specific context with a non-standard encoding). In a URL's query part, non-ASCII data is first UTF-8 encoded, then percent encoded (this is the modern way). I don't read Chinese, so it is hard to infer much from the original site, but I am assuming the search is for 'åä»', a city called Kashgar, https://en.wikipedia.org/wiki/Kashgar_(disambiguation). The string in question can be written as (to avoid copy/paste problems): String with: 21888 asCharacter with: 20160 asCharacter. The encoding in a URL has to be: ZnPercentEncoder new encode: (String with: 21888 asCharacter with: 20160 asCharacter). This gives us for example the following URL: 'https://www.google.com/search?q=%E5%96%80%E4%BB%80' asUrl. Which parses OK and contains the correct encoded string (decoded in the URL object): 'https://www.google.com/search?q=%E5%96%80%E4%BB%80' asUrl queryAt: #q. If you copy/paste that URL in your browser it should resolve to stuff about Kashgar. Obviously the website www.bidchance.com does something else (non-standard ?). HTH, Sven > Thanks, > > Offray

July 27, 2018