September 2014 - Pharo-users

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

by ClÃ©ment Bera

Depending on the VM you use, different objects are passed by values. Currently -> only smallintegers on Spur 32 bits VM -> smallintegers and characters on Spur 64 bits VM -> smallintegers, characters and smallfloat But as Stef said it does not really matter in smalltalk. 2014-09-25 21:55 GMT+02:00 nacho <0800nacho(a)gmail.com>: > " > 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. 26, 2014

Re: [Pharo-users] Your picture on Pharo contributors :)

by Sven Van Caekenberghe

On 26 Sep 2014, at 07:25, stepharo <stepharo(a)free.fr> wrote: > Hi guys > > do not forget to sign the license agreement > http://files.pharo.org/media/PharoSoftwareDistributionAgreement.pdf > and send us your picture to be added to > http://pharo.org/about > > Stef The picture should be a 70x70 PNG.

Sept. 26, 2014

Your picture on Pharo contributors :)

by stepharo

Hi guys do not forget to sign the license agreement http://files.pharo.org/media/PharoSoftwareDistributionAgreement.pdf and send us your picture to be added to http://pharo.org/about Stef

Sept. 26, 2014

Re: [Pharo-users] Loading PetitParser loads a hell of a lot of things... is there a terser version?

by Sean P. DeNigris

Tudor Girba-2 wrote > If you can live without the UI, you > can load the 'Core' group from the configuration. +1. That's what I usually do. ----- Cheers, Sean -- View this message in context: http://forum.world.st/Loading-PetitParser-loads-a-hell-of-a-lot-of-things-i… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Sept. 25, 2014

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

by Udo Schneider

Hi Stef, > We could easily turn your blog into a chapter for a future book :) Wow! I didn't really expect that! But I'd happy to help any way I can. Maybe by adding some bits an pieces how to parse blocks with multiple expressions? I have that working for a project I'm working on - but it isn't nice enough for an article (yet). > I have the impression that the blog is how to avoid parsing and still > get translation done! Let me put it that way: I love using PetitParser - but sometimes parsing an expression compared to full code is more than enough. It also has the benefit of blending nicely with regular Smalltalk tools (code, not Strings!) w/o hooking into the compiler - which makes it more portable by default. So you're right - it provides a "kind of AST" which allows you to reason about some Smalltalk expression w/o relying on a full parser. I'll use it for translating only though... The limitations of this approach are clear - but if you need more than the tools you'll need are clear and known as well. CU, Udo On 25.09.14 22:06, stepharo wrote: > 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] invoking python from pharo

by Pablo R. Digonzelli

Excellent, I will waiting ... 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 16:01:08 Asunto: Re: [Pharo-users] invoking python from pharo 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: BQ_BEGIN 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: BQ_BEGIN Pablo R. Digonzelli wrote: BQ_BEGIN 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 BQ_END BQ_END BQ_END

Sept. 25, 2014

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

by stepharo

> Yes I do, but you also know (it was clear from the article) that you learn a lot yourself from writing something for public consumption. Most people underestimate how powerful that is. :) In fact I only write for that: to force myself to deeply understand something and be able to forget it :) Stef

Sept. 25, 2014

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