- Pharo-users - lists.pharo.org

Re: [Pharo-users] BLOG: Block Translators - parsing magic

by stepharo

Hi udo I agree with sven :) We could easily turn your blog into a chapter for a future book :) I have the impression that the blog is how to avoid parsing and still get translation done! Stef > Hi Sven, > > thanks for the feedback. > > > Keep that kind of stuff coming, it is very helpful. > I'll try to. It just always takes so long to write stuff. But I think > you know that, don't you? :-) > > CU, > > Udo > > On 23.09.14 16:00, Sven Van Caekenberghe wrote: >> Hi Udo, >> >> This is really an excellent article: I enjoyed reading it a lot. >> >> It is well written, has lots of relevant code examples and a nice >> pace, but above all it is really interesting. >> >> Thanks a lot. >> >> Keep that kind of stuff coming, it is very helpful. >> >> Sven >> >> On 23 Sep 2014, at 01:48, Udo Schneider >> <udo.schneider(a)homeaddress.de> wrote: >> >>> All, >>> >>> I just finished a blog entry. It shows how to use Smalltalk blocks >>> as parsers/translators. E.g. translating a Block >>> >>> [:customer | (customer joinDate year is: Date today year)] >>> >>> into an SQL-like String >>> >>> (YEAR(customers.joinDate) = 2014) >>> >>> The SQL stuff is just an example - you can create nearly any output. >>> >>> Check out >>> http://readthesourceluke.blogspot.de/2014/09/block-translators-parsing-magi… >>> >>> Maybe that's old stuff for some of you - but I hope it's interesting >>> for some at least :-) >>> >>> Comments and feedback appreciated. >>> >>> CU, >>> >>> Udo >>> >>> >> >> >> > > > >

Sept. 25, 2014

Re: [Pharo-users] Passed by references and by value

by nacho

" stepharo wrote >> Hi, >> In PBE says that ordinary objects' ivars are passed by references and >> small >> integers are passed by value. > > Strange I do not remember having written that. > Especially because in Smalltalk this has no real interest. > > > Well you also wrote that :p > > "Deep in the implementation of Smalltalk, there are three different kinds > of objects. There are (1) ordinary objects with instance variables that > are passed by references, there are (2) small integers that are passed by > value, and there are (3) indexable objects like arrays that hold a > contiguous portion of memory. The beauty of Smalltalk is that you normally > donât need to care about the differences between these three kinds of > object. > >> Is there a way to know if a class is passed by reference or by value? > In Smalltalk consider that everything is an object and that you pass a > reference to the object. >> Only small integers are passed as value? >> Thanks in advance >> Nacho >> >> >> >> >> >> ----- >> Nacho >> Smalltalker apprentice. >> Buenos Aires, Argentina. >> -- >> View this message in context: >> http://forum.world.st/Passed-by-references-and-by-value-tp4780289.html >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >> ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/Passed-by-references-and-by-value-tp4780289p4780321.h… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Sept. 25, 2014

Re: [Pharo-users] Passed by references and by value

by stepharo

> Hi, > In PBE says that ordinary objects' ivars are passed by references and small > integers are passed by value. Strange I do not remember having written that. Especially because in Smalltalk this has no real interest. > Is there a way to know if a class is passed by reference or by value? In Smalltalk consider that everything is an object and that you pass a reference to the object. > Only small integers are passed as value? > Thanks in advance > Nacho > > > > > > ----- > Nacho > Smalltalker apprentice. > Buenos Aires, Argentina. > -- > View this message in context: http://forum.world.st/Passed-by-references-and-by-value-tp4780289.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Sept. 25, 2014

Re: [Pharo-users] Passed by references and by value

by Esteban A. Maringolo

I forgot. Floats too. And I think that's it. Esteban A. Maringolo 2014-09-25 15:35 GMT-03:00 Mark Rizun <mrizun(a)gmail.com>: >> > Only small integers are passed as value? >> >> Yes. >> >> It has to do with the object headers, SmallIntegers are embedded in the >> OH. > > > What about Float, for example? >

Sept. 25, 2014

Re: [Pharo-users] invoking python from pharo

by kilon alios

Its far from excellent. Its not as tested as I want it to be, and the code could be much better but it works and makes interfacing with python code very easy. Its also an ongoing project that I will keep adding feature to , for example I would like to extend pharo syntax to more complex stuff than calling python methods like defining python classes etc so you wont have to use sendMessage and getValue at all and not have to write a line of python code. In short do all your python coding using 100% pharo syntax. But that will take a lot of time to do because it will require a fully python syntax parser. I have updated the code to resolve the error when issuing a command to close the bridge with Ephestos sendMessage:'exit'. This command basically terminate pyAtlas and closes it server socket. I dont know if its Pharo or Python or Macos but it looks like it takes time to free up the socket address so you will need 20 seconds to restart pyAtlas again. I tried to set the timeout of the socket to 1 second but it looks to me it still uses the default 20 seconds timeout. I guess 20 sec is not that bad for a pre alpha software :D But anyway that should not be a problem since you will have to rerun pyatlas every 20 sec , which is something you would not want to do . I was actually planning to test Ephestos with pyQT and pyCuda and make a youtube video about it but have not found the time yet. Probably in the weekend. On Thu, Sep 25, 2014 at 9:23 PM, Pablo R. Digonzelli <pdigonzelli(a)gmail.com> wrote: > Yes , I was aware of the excellent work of kilon. > I was hoping that this be the way to solve my issue. > > Thanks kilon, I will follow your instructions and comment the results into > the list. > > > ------------------------------ > *Ing. Pablo Digonzelli* > Software Solutions > IP-Solutiones SRL > Metrotec SRL > 25 de Mayo 521 > Email: pdigonzelli(a)softsargentina.com > pdigonzelli(a)gmail.com > Cel: 5493815982714 > > ------------------------------ > *De: *"kilon alios" <kilon.alios(a)gmail.com> > *Para: *"Any question about pharo is welcome" <pharo-users(a)lists.pharo.org > > > *Enviados: *Jueves, 25 de Septiembre 2014 14:13:34 > *Asunto: *Re: [Pharo-users] invoking python from pharo > > a minor correction to the previous email its > python3 pyatlas.py and not python3 pyAtlas.py > > also I forgot to make clear that it works for pyhton 2.7 and python 3. > > On Thu, Sep 25, 2014 at 8:11 PM, kilon alios <kilon.alios(a)gmail.com> > wrote: > >> Hi there, I promised to do this a long time ago, but since you asked it I >> done it now. >> So as Ben said I am the author of Ephestos, a communication bridge >> between Blender and Pharo . >> >> To go directly to the how to . Ephestos is basically a socket bridge that >> send via sockets strings from pharo to python that then python executes as >> python commands. >> >> Ephestos is made so it works inside blender but I promised Atals a spin >> off project that allows the same socket bridge to be used as a standalone. >> To use do the following. >> >> 1) Get Ephestos , you can find it and install it with the configuration >> browser in your image in Pharo 3 and Pharo 4. Make sure you have a recent >> release though because I added it recently. >> >> 2) Get pyAtlas , this is the python side , you can get it from here --> >> https://github.com/kilon/pyAtlas >> >> 3) in your command line cd to the pyAtlas directory and execute : >> python3 pyAtlas.py >> >> 4) in Pharo you can now try any python code you want >> >> for example >> >> Ephestos sendMessage: 'print("hello world")'. >> Ephestos sendMessage: 'x = 3'. >> x := Ephestos getValue: 'x'. >> x inspect. >> >> Ephestos sendMessage: string, basically sends the python command to be >> executes while getValue: sends the command and returns a value as a string. >> >> you can use string 'exit' to close the socket bridge but this part is >> buggy as it seems to keep the binding of the sokcet active and I have to >> wait to clean it up in macos to reopen the bridge. >> >> You can also use pharo syntax and python errors will trigger the pharo >> debugger with a title the python error itself. >> >> You can find more information about Ephestos in my gitbook that can be >> read here >> >> https://www.gitbook.io/book/kilon/ephestos >> >> Also I forgot to add that sendMessage can send multiline strings , so its >> possible to send python class definitions and other stuff, you type the >> string exactly as you would type python code respecting whitespaces. If you >> want to execute loads of lines of python code then it would be better to >> put your code in a python module and do >> >> Ephestos sendMessage: 'import mymodule' >> >> assuming your module is called 'mymodule' , python import basically are >> executions of code. >> >> If you have any questions just ask. >> >> Bare in mind this is a socket bridge so its not ideal for sending >> thousands of messages per second and you may run into the occasional bug or >> two which I will fix if you report it. Nonetheless it should allow you to >> execute any kind of code and not just call python functions or python >> methods. >> >> >> >> On Thu, Sep 25, 2014 at 7:40 PM, Ben Coman <btc(a)openinworld.com> wrote: >> >>> Pablo R. Digonzelli wrote: >>> >>> Hi all , I need to invoke python rutines from Pharo. I need some >>> orientation about the best way to do it. >>> TIA >>> >>> ------------------------------ >>> *Ing. Pablo Digonzelli* >>> Software Solutions >>> IP-Solutiones SRL >>> Metrotec SRL >>> 25 de Mayo 521 >>> Email: pdigonzelli(a)softsargentina.com >>> pdigonzelli(a)gmail.com >>> Cel: 5493815982714 >>> >>> >>> Search the [pharo-dev] list for Ephestos by kilon. >>> cheers -ben >>> >> >> >

Sept. 25, 2014

Re: [Pharo-users] Passed by references and by value

by Alexandre Bergel

Floats are passed as values. Objects that are passed as values should be immutable, as floats and integers. Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. On Sep 25, 2014, at 3:35 PM, Mark Rizun <mrizun(a)gmail.com> wrote: > > Only small integers are passed as value? > > Yes. > > It has to do with the object headers, SmallIntegers are embedded in the OH. > > What about Float, for example? >

Sept. 25, 2014

Re: [Pharo-users] Machine learning in Pharo?

by HernÃ¡n Morales Durand

In BioSmalltalk you can do something like this: | cluster classifier trainedData observations| cluster := BioGroupOrganization forSimilarityOn: #value. trainedData := { 'Polaromonas naphthalenivorans CJ2' . 'Polaromonas sp. JS666' . 'Planctomyces limnophilus DSM 3776' . 'Nautilia' . 'Lactobacillus crispatus ST1' . 'Acidithiobacillus ferrooxidans' }. trainedData do: [ : feature | cluster addOrganization: (BioOrganization new feature: feature) ]. classifier := BioClassifier new organization: cluster. observations := 'Acidithiobacillus ferrooxidans ATCC 53993 chromosome, complete genome Lactobacillus crispatus ST1, complete genome Nautilia profundicola AmH chromosome, complete genome Planctomyces limnophilus DSM 3776 plasmid pPLIM01, complete sequence Planctomyces limnophilus DSM 3776 chromosome, complete genome Polaromonas sp. JS666 plasmid 2, complete sequence Polaromonas sp. JS666 plasmid 1, complete sequence Polaromonas sp. JS666, complete genome Polaromonas naphthalenivorans CJ2, complete genome Polaromonas naphthalenivorans CJ2 plasmid pPNAP08, complete sequence Polaromonas naphthalenivorans CJ2 plasmid pPNAP07, complete sequence Polaromonas naphthalenivorans CJ2 plasmid pPNAP06, complete sequence Polaromonas naphthalenivorans CJ2 plasmid pPNAP05, complete sequence Polaromonas naphthalenivorans CJ2 plasmid pPNAP04, complete sequence ' lines. observations do: [ : obs | classifier classify: obs ]. classifier classesSize = 6. classifier maxClasses = 6. classifier maxClass feature = 'Polaromonas naphthalenivorans CJ2'. classifier minClasses = 1. classifier minClass feature = 'Nautilia'. HernÃ¡n 2014-09-25 7:08 GMT-03:00 Martin Dias <tinchodias(a)gmail.com>: > Hi all, > > I'm playing with weka [1] for classifying data using data mining/machine > learning. I'm really new on this field so I want to give you a concrete > example of my use case to make it clear: > > I have elements that can be classified as true or false. In a training > phase, I set up a bayesian network with elements that I manually > classified. Then, I can use such network for predicting the classification > of new elements. > > ---> my question is: > Do we have a package for replacing weka-in-my-use-case in Pharo? It > doesn't need to be exactly a bayesian network, it could be simpler. > > > I looked a bit in Moose-Algos and in BioSmalltalk but I think they don't > have what I need. > > I would appreciate any help. Cheers. > MartÃn > > > [1]: http://www.cs.waikato.ac.nz/ml/weka/ > > >

Sept. 25, 2014

Re: [Pharo-users] Ridiculous we are

by Alain Rastoul

Le 25/09/2014 07:23, Sven Van Caekenberghe a Ã©crit : > > On 25 Sep 2014, at 01:04, Alain Rastoul <alf.mmm.cat(a)gmail.com> wrote: > >> Le 25/09/2014 00:06, Sven Van Caekenberghe a Ã©crit : >>> Alain, >> >>> The character encoding situation in Pharo is pretty good actually. The only problem is that there is some old school code left that encodes strings into strings, but today you can easily write much better and conceptually correct code. >>> >>> You could have a look at this draft chapter of the upcoming 'Enterprise Pharo' book that I am currently writing: >>> >>> http://stfx.eu/EnterprisePharo/Zinc-Encoding-Meta/ >>> >>> Concerning file system paths, FilePathEncoder and FilePluginPrimitives already do the right thing. >>> >>> Now, your idea about using UTF-8 to represent internal Strings is something that has been discussed before and in many other languages as well. The short answer is that due to it being variable length, the inefficiency is (probably) just too high. Simple indexed access becomes a problem, let alone more complex string manipulations. I am not saying that it cannot be done, I think it is just not worth the trouble. The current solution in Pharo with ByteString and WideString is quite nice (check the chapter I mentioned before). >>> >>> Sven >>> >> Very interesting ! >> It seems that most of what I was saying is already here :) >> I was not saying that Pharo should use utf8 (I mentionned utf8 because it is a standard, but I find the variable length encoding very weird), I was rather talking of using WideString in UTF 16 or 32 and that's done. >> I saw asWideString but didn't know about automatic convertion or codepoint selector and internal wide string support. >> Does it means that Pharo Greek users (for example) use WideString for Strings without having to specify it or make explicit convertions (except of course when dealing with bytes if they want to) ? >> If yes, very good, job is almost done :) >> (personnally I would also deprecate ByteString, and get rid of it, just my opinion). >> Thanks for the link, another good chapter . >> >> Regards, >> >> Alain > > ByteString is important because it is an optimalization of the most common case. I understand the point here, memory/data footprint, cpu cache and so on (not talking of encoding/decoding). I think that's why Microsoft choosed UTF16 (old UCS2) as a middle solution because it covers most of character sets with 2 bytes. May be I'm excessive but I have reasons, once had to debug a french program used in China by a Chinese user who was seeing "weird" characters on a (weird-to-me) chinese windows xp ... a missing WideString and a great moment of loneliness :) As a normal user you should only think of abstract Strings and never use #asByteString (but use proper encoding). > > Feedback on the chapter is always welcome. > > Sven > Agree. Your chapter is excellent, I played a bit with Zn encoders. I look forward to Pharo for the enterprise on Lulu. However, I'm wondering , WideString beeing a variableWordSubclass: with 32 bits words on a 32 bits vm, what will it become on a 64 bits vm ? 32 bits words or 64 bit words ? immediate characters (seen on ClÃ©ment Bera's blog about Spur and new object format) ? Alain

Sept. 25, 2014

Re: [Pharo-users] Passed by references and by value

by Mark Rizun

> > > Only small integers are passed as value? > > Yes. > > It has to do with the object headers, SmallIntegers are embedded in the OH. What about Float, for example?

Sept. 25, 2014

Re: [Pharo-users] Passed by references and by value

by Esteban A. Maringolo

2014-09-25 15:14 GMT-03:00 nacho <0800nacho(a)gmail.com>: > Hi, > In PBE says that ordinary objects' ivars are passed by references and small > integers are passed by value. > Is there a way to know if a class is passed by reference or by value? > Only small integers are passed as value? Yes. It has to do with the object headers, SmallIntegers are embedded in the OH. Esteban A. Maringolo

Sept. 25, 2014