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

Messaging solutions for Pharo
by Esteban A. Maringolo April 8, 2015

April 8, 2015

Hi, I'll be needing to add bidirectional messaging to our current Android (Java) application, and as usual I'm expecting to manage the server side of the communication with Pharo. I'm evaluating two alternatives, but I'm in open to other, proven, options. Option 1. WebSockets Open a WebSocket on each device, and push/retrieve messages from each of these, tracking the device id if I need to recreate a new socket (avoiding recreating new sockets in case of connectivity issues, very common). Option 2. MQTT [1] This is basically a mobile oriented MQ, super low footprint on mobile. For what I saw, I could implement the server using an intermediate MQ (RabbitMQ) and use STOMP to connect to it. Option 3. XMPP [3] Provides several features I'll need in the future, like file transfer in addition to regular text messaging. It is very well supported in Android with Smack [4], but I don't know if we have a Pharo server for it, or if somebody ever played with it. By means of simplicity and use load I favor option 1, because I can understand it better, and as everything moves towards web based technologies, I could implement WAMP [5] on top of that in the future. Right now I'd need to have a hundred websockets opened at the same time, which doesn't sound like a heavy load to me, but I certainly don't know. In the future it could be an order of magnitude bigger, and that's why I don't discard more complex solutions like XMPP or MQTT. Regards! [1] http://mqtt.org/ [2] https://github.com/svenvc/docs/blob/master/neo/stamp.md [3] http://xmpp.org/ [4] http://www.igniterealtime.org/projects/smack/ [5] http://wamp.ws/

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Code formatting - preserving newlines and comments
by Peter UhnÃ¡k March 25, 2015

March 25, 2015

Is it possible to configure formatter to preserve empty lines and line comments? e.g. -------------- myMethod someCode. < empty line that I would like to preserve > moreCode. --------------- the formatter also automatically puts comments on the end of the previous statement. e.g. ------ someCode. "a comment" moreCode. ---- ends up as ---- someCode. "a comment" moreCode. ----- Both those behaviors seems odd to me. I've seen empty newlines and line comments in Pharo code... so either I missed some setting or people just don't use the formatter? Thanks, Peter

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Question about loading Roassal2 in Pharo4
by Sven Van Caekenberghe March 24, 2015

March 24, 2015

Hi, I just loaded Roassal2 in Pharo4 using the following expression: Gofer it smalltalkhubUser: 'ObjectProfile' project: 'Roassal2'; configurationOf: 'Roassal2'; loadStable. When I try one of the examples I see that I am missing some GT presentations specific to Roassal. How should I load those ? Thx, Sven

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Aconcagua Documentation
by Sean P. DeNigris March 19, 2015

March 19, 2015

Is there anything besides http://stephane.ducasse.free.fr/Teaching/CoursAnnecy/0506-M1-COO/aconcagua-… ? There are not many class comments and the tests were a bit overwhelming for me... Specifically I'm searching for anything built-in to present measures in the "most tidy" representation e.g. "125 dollars" instead of "12500 cents", "10 cups" instead of "480 teaspoons", etc. ----- Cheers, Sean -- View this message in context: http://forum.world.st/Aconcagua-Documentation-tp4759781.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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[ANN] RProjectConnector V1.0
by Blondeau Vincent March 17, 2015

March 17, 2015

Hello everyone, I am glad to announce the first version of the RProjectConnector, a binding between Pharo and R using NativeBoost. You can now call directly your R methods from Pharo: data := (1 to: 1000) collect: #yourself. res := (#acf asRFunctionWith: {data}) eval To use it, you should copy the R libraries near the Pharo VM (see the documentation on SmalltalkHub to see how to proceed) and Gofer it smalltalkhubUser: 'VincentBlondeau' project: 'RProjectConnector'; configuration; loadStable Don't forget to relaunch Pharo after the installation to be able to use the connector. The sources are available on Smalltalkhub: http://smalltalkhub.com/#!/~VincentBlondeau/RProjectConnector if you want to participate, just ask me! Cheers, Vincent BLONDEAU ________________________________ Ce message et les pi?ces jointes sont confidentiels et r?serv?s ? l'usage exclusif de ses destinataires. Il peut ?galement ?tre prot?g? par le secret professionnel. Si vous recevez ce message par erreur, merci d'en avertir imm?diatement l'exp?diteur et de le d?truire. L'int?grit? du message ne pouvant ?tre assur?e sur Internet, la responsabilit? de Worldline ne pourra ?tre recherch?e quant au contenu de ce message. Bien que les meilleurs efforts soient faits pour maintenir cette transmission exempte de tout virus, l'exp?diteur ne donne aucune garantie ? cet ?gard et sa responsabilit? ne saurait ?tre recherch?e pour tout dommage r?sultant d'un virus transmis. This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, the Worldline liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted.

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SmaCC: First steps
by kilon alios March 3, 2015

March 3, 2015

Ok I have read a few times of the tutorial of Smacc in here http://www.refactoryworkers.com/SmaCC/ASTs.html and I am also following the help tool documentation inside pharo for SmaCC and I have to say I am very confused. Please bare with me because I am extremely noob when it comes to parsing, this is my first effort. Now the way I understand it so far, is that SmaCC uses a syntax similar to regex expressions to define parsers and scanners. Scanners evaluate a string to see that it contains a valid form and parser divide to parts named as "tokens" and help in the creating of ASTs which are basically hierarchy tree containing the syntax elements of a language. Now in order to make SmaCC work I need to use the SmaCC tool that comes with pharo . The smacc tool takes two inputs a scanner and a parser class. Does that mean I need to create that parser and scanner class ? I thought since I define the syntax that those things would be generated by the tool. What I need to define exactly ? Why when I select the PythonScanner2 and PythonParser2 and click then Compile LR it gives a MNU receiver of method is nil ? I am using latest Pharo 4 image. My goal is to parse python types to similar pharo objects. I get those python types as strings and my main focus in lists, dictionaries and tuples . The tricky part is that one can contain the other inside in every imagined way. The way I understand it I will need something called "transformations" to convert those python types to OrderedCollections, Arrays etc and anything would make more sense for a pharo coder. Additionally what is the meaning of the vertibal bar ? --> | eg. | Number Are there any other tutorials that can help a beginner like me to understand these concepts ? I am not looking for someone to give me the solution to the plate, I would love to learn and understand parsing because I am very interested into making Pharo easy to mix with Python code and allow Pharo to use Python libraries without the user having to learn or code Python :) As you may imagine this is a crucial ingredient for my project Ephestos which tries to use Pharo to script Blender by either replacing or cooperating with blender python. So learning a good way to parse pharo code to python code and vice versa is extremely important for me.

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smalltalk workshops (building a webserver) after code-in
by Martin BÃ¤hr Feb. 28, 2015

Feb. 28, 2015

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. -- eKita - the online platform for your entire academic life -- chief engineer eKita.co pike programmer pike.lysator.liu.se caudium.net societyserver.org secretary beijinglug.org mentor fossasia.org foresight developer foresightlinux.org realss.com unix sysadmin Martin BÃ¤hr working in china http://societyserver.org/mbaehr/

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Conditional CSV parsing
by HernÃ¡n Morales Durand Feb. 23, 2015

Feb. 23, 2015

I used to use a CSV parser from Squeak where I could attach conditional iterations: csvParser rowsSkipFirst: 2 do: [: row | " some action ignoring first 2 fields on each row " ]. csvParser rowsSkipLast: 2 do: [: row | " some action ignoring last 2 fields on each row " ]. csvParser rowsWhere: [ " a condition block " ] do: [ : row | " ... " ]. csvParser rowsUpTo: 500000 do: [ " some action for rows up to 500000 " ]. csvParser rowsFrom: 2000 to: 5000 do: [ " some action for rows between 2000 to 5000 " ]. I want to replace the parser with NeoCSVReader, is this easily possible with the current implementation? Cheers, HernÃ¡n

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Rule engine
by HernÃ¡n Morales Durand Feb. 15, 2015

Feb. 15, 2015

Hello, If anyone is working in a rule engine we could merge efforts because I have implemented one (or something like that) for a project. Cheers, HernÃ¡n

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Changes file size
by Esteban A. Maringolo Feb. 13, 2015

Feb. 13, 2015

I know we're on our way to get rid of changes, but meanwhile after installing my Metacello config I end up with an image of 40megs and a changes file of 140 megs!!! It doesn't load anything too esoteric: Glorp, Magritte, Seaside, Postgres, NeoCSV and my own packages. I can run PharoChangesCondenser condense, but it takes forever! (I started it 20 minutes ago and it's still running). Is there a way I can improve this situation? Esteban A. Maringolo

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