- Pharo-users - lists.pharo.org

Re: [Pharo-users] How to silently generate and remove code

by Werner Kassens

On 03/30/2015 09:10 AM, Marcus Denker wrote: > What the compiler does not have is to look up references e.g. to symbols regarding to an environment, but that is because we > donât have that concept right now in the system in general. globals/class vars are requested from the class (which defines its environment). > > So in general, we first need a use case, else it is not clear what to doâ¦ Hi Marcus, i dont know whether this really applies to the things you are talking about here, but it sounds a bit like it eventually could, hence i'll mention it: i had a little program, that constructs an array of blocks (no object methods) via opal from scratch (using strings). now this worked of course without problems, but there are situations where it would be nice if those blocks would have - in a _simple_ way - access to common variables constructed by the program, iow if all those blocks would live in the same 'space' as those variables - or however thats called correctly. does this scenario apply as a possible use case (obviously completely different from Johan's use case) ? werner

March 30, 2015

Re: [Pharo-users] How to silently generate and remove code

by Johan Fabry

> On Mar 30, 2015, at 09:23, Christophe Demarey <Christophe.Demarey(a)inria.fr> wrote: > > > Le 30 mars 2015 Ã 09:10, Marcus Denker a Ã©crit : > >> >>> On 29 Mar 2015, at 10:32, stepharo <stepharo(a)free.fr> wrote: >>> >>> Before that I would like that the compiler outputs classes definition in an environment (that can be the default one) but that can be the one >>> I want and specified from the outside of the compiler. >> >> For installing, it is the ClassInstaller that does that (and yes, it has an environment). >> >> What the compiler does not have is to look up references e.g. to symbols regarding to an environment, but that is because we >> donât have that concept right now in the system in general. globals/class vars are requested from the class (which defines its environment). >> >> So in general, we first need a use case, else it is not clear what to doâ¦ > > A first use case could be to install new code in a sandbox, check if the loading is good, and then move the code to the default environment, else drop the sandbox. > It is also a part of the feature asked by Johan: install code in a sandbox for tests purposes and then drop it without perturbing the system. To be clear: I want to be able to generate code (classes and methods in these classes), and remove them when needed without it being logged in the changes file. This is because it may end up to be a lot of code that changes extremely frequently, so it will pollute the change file a lot. And for debugging, I want to be able to see the source for the methods, even though they are not in .changes. (I will never want to version this code nor do anything else âseriousâ with it, itâs all generated stuff). ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD lab - Computer Science Department (DCC) - University of Chile

March 30, 2015

Re: [Pharo-users] How to silently generate and remove code

by Christophe Demarey

Le 30 mars 2015 Ã 09:10, Marcus Denker a Ã©crit : > >> On 29 Mar 2015, at 10:32, stepharo <stepharo(a)free.fr> wrote: >> >> Before that I would like that the compiler outputs classes definition in an environment (that can be the default one) but that can be the one >> I want and specified from the outside of the compiler. > > For installing, it is the ClassInstaller that does that (and yes, it has an environment). > > What the compiler does not have is to look up references e.g. to symbols regarding to an environment, but that is because we > donât have that concept right now in the system in general. globals/class vars are requested from the class (which defines its environment). > > So in general, we first need a use case, else it is not clear what to doâ¦ A first use case could be to install new code in a sandbox, check if the loading is good, and then move the code to the default environment, else drop the sandbox. It is also a part of the feature asked by Johan: install code in a sandbox for tests purposes and then drop it without perturbing the system.

March 30, 2015

Re: [Pharo-users] How to silently generate and remove code

by Marcus Denker

> On 29 Mar 2015, at 10:32, stepharo <stepharo(a)free.fr> wrote: > > Before that I would like that the compiler outputs classes definition in an environment (that can be the default one) but that can be the one > I want and specified from the outside of the compiler. For installing, it is the ClassInstaller that does that (and yes, it has an environment). What the compiler does not have is to look up references e.g. to symbols regarding to an environment, but that is because we donât have that concept right now in the system in general. globals/class vars are requested from the class (which defines its environment). So in general, we first need a use case, else it is not clear what to doâ¦ Marcus

March 30, 2015

Boardician (board game framework) update

by Laura Risani

Hi all, I did some clean up and implemented one new (old) game. More changes to come upon feedback. It's very important that we all play with them cause science shows that this type of games improve brain function <http://www.technologyreview.com/view/415115/does-tetris-boost-brainpower/>. You can install configuration BgBoardician from Configuration Browser on 3.0 and 4.0 . Documentation here <http://boardician.blogspot.com.ar/2015/03/boardician.html> Best, Laura

March 29, 2015

Re: [Pharo-users] Introduction to OOP for UPBE was: Some new book chapters :)

by stepharo

> I would like the opinion of the community on this. I have discussed > the addition of an introduction to OOP back when I was very actively > contributing to UPBE and the response I got was very positive. The > plan was similar to what I mentioned, just bare basics , making sure > that the reader understand the very basic fundamental concepts of OO, > like classes, inheritance, instances, class and instance variables, > class and instance methods etc. Essentially a chapter similar to my > video tutorials but going a bit deepers with more detailed example > still keeping it simple , clear and understandable even for non coders. If you write something I will review it and tell you if it is ok for the book. If this is more or less ok, I'm ready to do a pass. so I can help if what you write is ok. Now I do not know your writing skills so I do not want to tell you that this is ok without even getting a feel about what you can produce. > > I want to know whether such chapter would be included because I dont > like to waste my time or the precious time of the student that has > taken the task on her shoulders. > > "IMHO this is the exception to that obvious rule. OOP in particular is > misunderstood by almost everyone. If we as Smalltalkers describe it > from a forensic CS perspective that sounds to me like C++, I believe > it is better that we say nothing on the subject." > > Personally I dont care if people misunderstand OOP , I only care about > getting my code to work the way I want it. So far I had no problem > doing that even though I code using very simple concept some of them > may come even back when I was coding in C++. I also dont share the > sense of wonder that some of you may share about how Smalltalk is > doing OO, coming from python does not seem such a big deal for me. > > For example message passing suppose to be this super powerful feature > , that diffirentiate from method calls in the essence that the user > does not need to know the internals of the class. But I have not seen > a class that take advantage of this feature inside pharo. sorry but I do not get the last paragraph. To me method calls are just a different way to call message passing and I prefer message passing because it conveys that we do not directly refer to the method but that the method is dynamically selected. > In every single case if I had exchanged the message passing with > method calls I would not have even noticed the difference. How could you? in Smalltalk the only to implement what you call method calls is to access directly the method and use executeXXX on it. > In every case I have studied each message corresponds to a method with > exactly the same name. There are plenty of methods defined with the same name in the system so I do not get your point. > I am sure maybe one day will come handly , but I dont see why one > needs to explain a feature that rarely someone will use understand how > to code in a specific environment. ??? Stef

March 29, 2015

Re: [Pharo-users] Introduction to OOP for UPBE was: Some new book chapters :)

by kilon alios

first example is at page 5 . I don't overheat , I rarely get angry. So there is no reason to worry, all opinions are more than welcomed. If the styles of documentation that the community desires is on par with the link you provided then I know and this is not what I want to be working on. But since creating a chapter is quite an effort I rather spent efforts on things that are here to stay than things that get ignored. its ok , chapter cancelled, I hope an expert is found sometime in the near future to fill in our shoes. Have fun :) On Sun, Mar 29, 2015 at 5:59 PM, Hilaire <hilaire(a)drgeo.eu> wrote: > Hello, > > > [..] no need to list the chapters, I know the book. > > > Le 29/03/2015 16:43, kilon alios a Ã©crit : > > > The iink your provided is a reference documentation and I dont like > > this kind of documentation sinking inside theory with few practical > > examples. Quite the opposite of PBE and frankly a really bad way to > > teach coding especially to a newcomer and someone unfamiliar with OOP. > > > > We are probably not reading the same article then, the one I pointed to > you comes with a lot of examples. Nevertheless, only its first > paragraphs were of interest related to the point Sean raised. > Anyway I gave my opinion and will stop on this discussion before it > overheats. > > Best > > -- > Dr. Geo - http://drgeo.eu > iStoa - http://istoa.drgeo.eu > > > >

March 29, 2015

Re: [Pharo-users] MySQL framework for Pharo to analyze futures and options.

by Merwan Ouddane

On 29/03/2015 15:58, Mariano Martinez Peck wrote: > > > On Sun, Mar 29, 2015 at 6:07 AM, Sven Van Caekenberghe <sven(a)stfx.eu > <mailto:sven@stfx.eu>> wrote: > > > > On 29 Mar 2015, at 04:47, Pierce Ng <pierce(a)samadhiweb.com > <mailto:pierce@samadhiweb.com>> wrote: > > > > On Fri, Mar 27, 2015 at 02:21:01PM -0700, nacho wrote: > >> I'm using MySQL to hold some data on commodities prices for futures > >> valuation and want to - of course - use Smalltalk as a > front-end. Which > >> framework would you recommend? > > > > There is a pure Smalltalk MySQL driver on Squeaksource. Not sure > whether > > it has been moved to SS3 or STH. > > > > http://www.squeaksource.com/StdbMysqlProtocol > Here it is: http://smalltalkhub.com/#!/~DBXTalk/MysqlDriver > > > > Others have suggested Glorp. Glancing at the code, seems Glorp > currently only > > works with VisualWorks' MySQL driver. Based on my experience > integrating > > NBSQLite3 into Glorp, I'd say it will take about a day or two, > depending on the > > design of the driver. I've tested abovementioned MySQL driver > with some version > > of MySQL5 some months ago. > > It would be very good to have another Glorp solution with a pure > Smalltalk implemented DB driver, like the PostgresV2 one. IMHO > this is way less error prone than the whole library/driver/.. mess > on all these different platform. > > > Since our Glorp refactor back years ago...adding a Glorp adaptor > (DatabaseDriver subclasses) should be very very easy. > So yes, it would be nice to do it for the MySQL driver...but I thought > we already had that... > Me and some other students made an adaptator for the MySQL Driver written in smalltalk based on the one for PostgresV2, you can find it here: http://smalltalkhub.com/#!/~ThomasHeniart/GlorpDriverMySQL There is a method NativeMySQLDriver>>beGlorpDefaultDriver to use it as native driver for glorp. We posted it on the mailing list one and a half month ago ^^ > > -- > Mariano > http://marianopeck.wordpress.com

March 29, 2015

Re: [Pharo-users] MySQL framework for Pharo to analyze futures and options.

by nacho

Hi! @Cameron: Yes the data is in a MySQL database. I could do a dump and save it as CVS or plain text, should be no problem but I think I prefer to keep it as a SQL database as the new data gets updated automatically. @Mariano: I installed Glorp and as you say, the driver is there, altough in the class comments it says that is not complete yet. I would take a look these days to see if it works properly. Thanks for your support!! Cheers Nacho ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/MySQL-framework-for-Pharo-to-analyze-futures-and-opti… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

March 29, 2015

Re: [Pharo-users] Introduction to OOP for UPBE was: Some new book chapters :)

by Hilaire

Hello, [..] no need to list the chapters, I know the book. Le 29/03/2015 16:43, kilon alios a Ã©crit : > The iink your provided is a reference documentation and I dont like > this kind of documentation sinking inside theory with few practical > examples. Quite the opposite of PBE and frankly a really bad way to > teach coding especially to a newcomer and someone unfamiliar with OOP. > We are probably not reading the same article then, the one I pointed to you comes with a lot of examples. Nevertheless, only its first paragraphs were of interest related to the point Sean raised. Anyway I gave my opinion and will stop on this discussion before it overheats. Best -- Dr. Geo - http://drgeo.eu iStoa - http://istoa.drgeo.eu

March 29, 2015