January 2015 - Pharo-users - lists.pharo.org

Re: [Pharo-users] New book for Pharo :)

by Werner Kassens

Hi HernÃ¡n > This is like if I get 5 mathematicians, fork SciSmalltalk, push cool new > features, and then make all you loose them if you don't update. And I > could do it for fun 1000 times. You get the idea. <g> got it! btw Serge explained his plans for scismalltalk here: http://forum.world.st/scismalltalk-policy-tp4799887p4801564.html an excerpt: "What I want to do is to have a uniform prefix for all SciSmalltalk classes, maybe SCI or MATH." werner

Jan. 29, 2015

Re: [Pharo-users] Why single inheritance?

by Ben Coman

http://www.visoracle.com/squeak/faq/traits-vs.html On Wed, Jan 28, 2015 at 11:41 PM, Laura Risani <laura.risani(a)gmail.com> wrote: > Hi all, > > What is the explanation why Smalltalk designers preferred single > inheritance+traits to multiple inheritance? Why is the former better than > the latter? > Do traits let you share state also or only behavior? > > Best, > Laura >

Jan. 29, 2015

[ANN] PUnQLite NoSQL database project updated

by Torsten Bergmann

Hi, are you in need for really simple out of image persistency? If you like to use a small RDBMS solution with Pharo then there is the embeddable SQLite shared library and NBSQLite3 project [1] to access it. Combine it with Glorp [2] and you do not have to fight too much with SQL. On the other end of persistency world there are the so called "NoSQL databases" and beside Mongo and all the others that require special setup etc. there is this wonderful small UnQLite embeddable database [3] that similar to SQlite world only requires a simple library. Thanks to Masashi Umezawa there is a nice wrapper for Pharo already to access this tiny embeddable NoSQL database called "PUnQLite" [4] and [5], also including access to the Jx9 machinery of UnQLite. It is really cool that he made this available. This week I updated "PUnQLite" a little bit: - refactored the Native boost wrapper for UnQLite (using shared pools, ...) - documented classes - added a help topic - fixed a bug in cursors when accessing the keys in an empty database - and finally added a small spec based tool to work with a database file (see attached screenshot) One can use it to open an unqlite database, show the key value pairs and remove or add entries. If you are in latest Pharo 4 already you can load all of that right from the config browser. Be aware that you need the external unqlite shared library which is downloaded and extracted into a folder "pharo-vm" when loading the config. For instance on Windows it automagically downloads a file "pharo-vm/unqlite.dll" below your image directory and you just have to copy this shared library file to the folder where your VM (Pharo.exe) resides. Havent tried on other OS platforms. >From the Pharo side using the UnQLite database basically works like having some kind "external dictionary" in a database file. Just run that in a workspace: |db| db := PqDatabase open: 'comments.db'. db disableAutoCommit. db transact: [ Object subclasses do: [:cls | | key | key := cls asString. db at: key put: cls comment ] ]. db close. Then open the "Database Browser" from the world menu and open the "comments.db" file. You can browse the keys and values, remove entries or add new. A filter for the keys is also included. Nothing fancy but hope you like it or find it usable. Couldnt make it to PharoConf 2015 but I hope all participants enjoy their time there. Keep the others updated by using the #pharodays2015 on Twitter. Have fun! Bye T. [1] http://lists.pharo.org/pipermail/pharo-dev_lists.pharo.org/2015-January/104… [2] http://lists.pharo.org/pipermail/pharo-users_lists.pharo.org/2015-January/0… [3] http://unqlite.org/ [4] https://github.com/mumez/PunQLite [5] http://smalltalkhub.com/#!/~MasashiUmezawa/PunQLite

Jan. 29, 2015

Re: [Pharo-users] New book for Pharo :)

by HernÃ¡n Morales Durand

We could probably start with RBClassRegexRefactoring new renameClasses; replace: '^Dhb(.*)$' with: 'NM$1' ignoreCase: false; execute. or whatever prefix you prefer :) I wrote some DHB extensions for easier building of matrices, if anyone give me access to the SciSmalltalk repository I could push them for review. HernÃ¡n 2015-01-29 4:05 GMT-03:00 stepharo <stepharo(a)free.fr>: > So hernan > how do we make progress? > > >

Jan. 29, 2015

Re: [Pharo-users] SPEC and Athens

by Sebastian Heidbrink

Okay, I had a short look and it seems one needs to either subclass the GenericAdapter, or configure it upon initializtion. One will need to add handlers upon resize and maybe even implement some kind of Form around the polymorph... but I have no idea if there is something like a form in Spec... I do not know it enough yet. Try this and see. It is part of the RewriteRuleBuilder statusBarForMatch | morph | morph := TransformationRule arrowMorph: ActivePolygonMorph. morph rotationDegrees: 90; scale: 0.6; color: self matchColor; infoText: self matchLabel; yourself. ^ morph asSpecAdapter vSpaceFill; yourself Sebastian On 2015-01-28 12:26 PM, Mark Rizun wrote: > It is in rewrite tool that I'm developing. > You can download it here: > > http://smalltalkhub.com/#!/~MarkRizun/RewriteTool > <http://smalltalkhub.com/#%21/%7EMarkRizun/RewriteTool> > > The morph is used, for example, in RewriteRuleBuilder>>#statusBarForMatch > > Mark > > 2015-01-28 21:24 GMT+01:00 Sebastian Heidbrink <sheidev(a)yahoo.de > <mailto:sheidev@yahoo.de>>: > > Hi Mark, > > can you send me an example implementation on this? > > I'll try to find a solution that might work for both of us. It is > easier to find the reason with a second reference implementation, > I guess. > > Sebastian > > > > Am 28.01.2015 um 07:27 schrieb Mark Rizun: >> I have the same problem with PolygonMorph. It does not resize >> properly. >> Also I couldn't find any event related with window resizing. >> If you find a solution please let me know. >> >> Mark >> >> 2015-01-28 16:19 GMT+01:00 Sebastian Heidbrink <sheidev(a)yahoo.de >> <mailto:sheidev@yahoo.de>>: >> >> Am 28.01.2015 um 07:07 schrieb Mark Rizun: >>> >>> First the svg does not resive properly while resizing >>> the window. >>> >>> >>> What do you mean by this? >> >> Well, I implemented the example window from spec.st >> <http://spec.st> and added a ASVGMorph to it. >> When I now resize the window, then the button changes his >> size correctly but the svg somhow just seems to be put into >> the background. >> I then implemented a SVGMorpModel that includes a >> ASVGMorpAdapter and adde dthis one to my example window but >> the result is that the SVG resizes just half the speed... >> >> >>> How can I also introduce an animated SVG? Like an svg >>> that changes color during a mouse click? >>> >>> >>> To work with events that are implemented in >>> AthensSvgMorph you have to (as far as I know) access this morph. >>> You can do it by sending #widget message to your model to >>> times like this: >>> >>> svgModel widget widget ==> svgMorph >>> >>> Than morph can handle events like "changes color during a >>> mouse click". >>> >>> Are there any particular Models that could be used as a >>> container for this SVGMorphAdapter? >>> >>> >>> SVGMorphAdapter is a class that represents a layer betwen >>> SVGMorph and model of svg in spec. >>> It allows model and morph to "communicate" with each other. >>> >>> Mark >> >> > >

Jan. 29, 2015

Re: [Pharo-users] any OCR library for Pharo (Free or Commercial)

by stepharo

I do not know the ones that use pinesoft but they made it for real and sell products Stef Le 29/1/15 05:32, Sanjay Minni a Ã©crit : > Hi > > is there any OCR library which has been interfaced with Pharo > (may be Free or Commercial library licence). > > I need a robust one preferably without deployment licence fee > > Regards > Sanjay > > > > ----- > --- > Regards, Sanjay > -- > View this message in context: http://forum.world.st/any-OCR-library-for-Pharo-Free-or-Commercial-tp480237… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Jan. 29, 2015

Re: [Pharo-users] smalltalk workshops (building a webserver) after code-in

by stepharo

This is excellent!!!! I'm working on new teaching material and I would love to have a simple chat app in a couple of lines :) Stef Le 29/1/15 05:52, Martin BÃ¤hr a Ã©crit : > hi, > > Google Code-In is over (i'll probably write more about that later) > and there are a few students who have started their path to smalltalk. > > because there was interest among the students to continue learning, we have > started a series of workshops to learn the elements of building a webserver. > > i have created a screencast for the first topic: FileSystem > > you can read more about the workshop and find the screencast here: > http://societyserver.org/mbaehr/training/Using-the-FileSystem-class-in-Phar… > > being new to smalltalk myself, there are probably some mistakes, and things > that could be done better, however i believe the screencast is usable for > learning. > > i recorded this mostly without interruption except for a few times where i was > lost and had to stop and look up what i was going to do. > > i am open to feedback and criticism of any kind, from pointing out redundant > ()s or ways to improve the code to tips for debugging and testing. > > the next workshop will be saturday the > > greetings, martin. >

Jan. 29, 2015

Re: [Pharo-users] New book for Pharo :)

by stepharo

So hernan how do we make progress?

Jan. 29, 2015

Re: [Pharo-users] New book for Pharo :)

by stepharo

Le 29/1/15 01:08, Werner Kassens a Ã©crit : > Hi StÃ©phane, > > thanks to Msr Besset, to you and to the other people who made this > possible. it's a fascinating book. We really want to have new library. > > werner > >

Jan. 29, 2015

Re: [Pharo-users] New book for Pharo :)

by stepharo

> Let's get started with this. > I agree with NumericalMethods being freezed in the Configuration Browser. > But I don't want to be forced to load the whole SciSmalltalk to use 3 > methods in NumericalMethods. > > Do you agree Serge? I agree with you that having a nice modular structure is important. > Can you import the ConfigurationOfNumericalMethod from a common > repository in SciSmalltalk? > >> I am trying to avoid what the Python community did with NumPy and >> SciPy which is a mess. >> > Ah you see you have to sync with Serge. I think that Serge was not > aware about that you publish the code in your repository. > Now we want to rename the acronym (because DHB is not good) and > probably improve the code of the library while keeping the book in > sync (like using String streamContents for printing). > > > DHB prefix is ugly of course. so let us rename it > > I personally hate to see all the comment with a copyright and a > commit dates. > > > Me too. let us fix that too. We can put a simple copyright notice on the class side. > > > HernÃ¡n > > Stef > >> HernÃ¡n >> >> >> 2015-01-28 16:16 GMT-03:00 stepharo <stepharo(a)free.fr >> <mailto:stepharo@free.fr>>: >> >> Hernan >> >> This is 8 months that I push didier to release it. I spent my >> week-end to edit it. >> So when you talk about respect use your energy th right way. >> >> Stef >> >>> >>> >>> 2015-01-28 14:21 GMT-03:00 stepharo <stepharo(a)free.fr >>> <mailto:stepharo@free.fr>>: >>> >>> Didier Besset offered his great book "Object-Oriented >>> Implementation of Numerical Methods >>> An Introduction with Smalltalk and Java" to the community. >>> >>> We would like to thank Didier Besset for his great book >>> and for his gift of the source and implementation to the >>> community. >>> >>> >>> This is indeed, great news. >>> >>> >>> You can find >>> â¢ Archive of the original book, with code in both >>> Java and Smalltalk >>> https://github.com/SquareBracketAssociates/ArchiveOONumericalMethods >>> >>> https://github.com/SquareBracketAssociates/ArchiveOONumericalMethods/blob/m… >>> >>> >>> â¢ An abridged version of Didierâs book, without the >>> Java implementation and reference; our goal is to make >>> the book slimmer and easier to read. The implementation >>> presented in this book is part of the SciSmalltalk library. >>> >>> >>> The implementation presented in his book is part of the >>> NumericalMethods library. >>> >>> You want to promote SciSmalltalk, then first respect others. >>> NumericalMethods could be part of SciSmalltalk, but it is >>> the library where code was originally released. >>> >>> Cheers, >>> >>> HernÃ¡n >>> >> >> > >

Jan. 29, 2015