December 2014 - Pharo-users

PetitParser and PPBrowser in Pharo 3.0
by Hartmut Jan. 1, 2015

Jan. 1, 2015

Hi to all, I'm working with PetitParser in a Pharo 3 image. Until now I had to do without the PPBrowser which I loved in Pharo 2. On forum.world.st I now found the hint by Jan Kurs to install all of the Petit suite: > "Configuration should be loaded like this:" > Gofer new smalltalkhubUser: 'Moose' project: 'PetitParser'; > configurationOf: #PetitParser; load. > > "All the petit parser suite:" > ConfigurationOfPetitParser loadDevelopment. Apart from the fact that this installed a real lot into my image, I notice the following problems in PPBrowser: 1. The map of none of the 18 parsers included, is displayed (it becomes red crossed). However, this was the most useful part of it 2. My interrelated parsers consist of a tree of parsers where each leave has its own start clause. They define related languages. It makes no sense to add a /start/ clause to the root. However, without such a meaningless /start/ clause, only the /source/ is displayed, neither /graph, example, first/ or /follow/ of any clause. (this can be reproduced when you move PPJsonGrammar>>start to PPJsonParser) I like the style of having a grammar class above a parser (or compiler) class. This is as seen in most of the accompanying parsers. My preferred petit parser style comprises: a) keeping grammar rules (without ==>) in the upper classes of the grammar hierarchy tree, such that we find the complete grammar there (without the /start/ clause). b) keeping replacement rules (using ==>) as low as possible the grammar hierarchy tree c) writing the start clause to the class that is actually called. (this gives different entries in a grammar allowing for different languages with grammar subsets) Is there an idea to have 1. and/or 2. resolved? Hartmut -- Hartmut Krasemann? KÃ¶nigsberger Str. 41 c ?D 22869 Schenefeld? Tel. 040.8307097? Mobil 0171.6451283? krasemann(a)acm.org

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PetitParser problem with plus
by James Foster Jan. 1, 2015

Jan. 1, 2015

There is something about plus that I donât understand. In the following code if I parse for (x , x) then I get what I expect. If I parse for (x plus) then the image hangs. What am I doing wrong? James | a notA x y | a := $a asParser. notA := $a asParser negate star flatten. x := a / notA. y := x , x. âworks fineâ y := x plus. ânever finishesâ ^y end parse: 'abâ.

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Implementation of book editor for PillarHub application
by Flayer Jan. 1, 2015

Jan. 1, 2015

Hello everyone! My name is Maxim Skripnik, and I wish to tell you about my first project that deals with Pharo and Pillar world. To make a long story short, it's about extension of functional for web-application called "PillarHub" that is written fully on Pharo with Seaside's tools. In substance, today it's a editor and viewer for articles written on Pillar markup but I will add opportunity to compile complete books from them. Anyway, if you are interested in it, you may find full description * here <http://pillarhub.pharocloud.com/hub/MaximSkripnik/bookcompilerintro> *. There, on PillarHub, I will report on progress, so check for updates there. Feel free to comment and share your ideas with me, I would be very glad to see some. Thank you for your attention! -- View this message in context: http://forum.world.st/Implementation-of-book-editor-for-PillarHub-applicati… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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Pharo by Example updated: Metaclass chapter
by stepharo Dec. 31, 2014

Dec. 31, 2014

Hi guys I just finished to revisit the metaclass chapter for Pharo by Example based on Pharo 40. Stef

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pharo at google code-in
by Martin BÃ¤hr Dec. 31, 2014

Dec. 31, 2014

hi, i have been meaning to learn smalltalk for a while, but i always lacked a good project that i could do with it, until recently. and figuring that teaching is the best way to learn i put up my projects as tasks for google code-in as part of FOSSASIA which is a code-in mentor organization. since code-in targets middle and highschool students, it is quite unlikely that any of them already know smalltalk, or have even heared about it. so in a way this will introduce a few students to smalltalk. i picked pharo because i feel it is going in the right direction trying to improve and also adding things like commandline support. for my tasks i have two major aims: a desktop application that can search a given collection of text and browse the search results. a web application in form if a RESTful user management system that can be used as authentication server for nginx. (nginx makes a request for a given resource and asks if a user is allowed access) it has a dynamic frontend (angular.js or other) without generating html in the server. both projects are split up into several tasks. the desktop application project starts out exploring the basics of how to display text in a frame, covering the full pharo window, and switch between multiple texts: http://www.google-melange.com/gci/task/view/google/gci2014/5902940472606720 once completed a second task will add search capabilities: http://www.google-melange.com/gci/task/view/google/gci2014/5904045940146176 for the web-project first a set of tasks explores various web frameworks by letting the students walk through a tutorial and report on the results: aida: http://www.google-melange.com/gci/task/view/google/gci2014/5858171612561408 http://awblog.blog.com/2014/12/21/hello-world-creating-a-simple-webpage-wit… iliad: http://www.google-melange.com/gci/task/view/google/gci2014/5888240192061440 http://awblog.blog.com/2014/12/22/hello-world-creating-a-simple-webpage-wit… seaside: http://www.google-melange.com/gci/task/view/google/gci2014/5786620192096256 zinc: http://www.google-melange.com/gci/task/view/google/gci2014/5906919541702656 i may add another task for teapot, but i could not find any tutorial for tide the next step is to figure out how to serve static files from the image: http://www.google-melange.com/gci/task/view/google/gci2014/5814729360539648 the reason for that is that, this being a small application, i prefer easy deployability over performance, so i'd rather have all assets within the image. then the REST api: http://www.google-melange.com/gci/task/view/google/gci2014/5880541949722624 personally i am now leaning towards either just zinc or teapot to build the API since i have no need for most of the features of the larger frameworks. initially i was interested in aida because of its support for user management, but i am not sure it is needed. there is of course also a frontend: http://www.google-melange.com/gci/task/view/google/gci2014/5905960371486720 demo: http://idarbek.com/angular and a task to connect the two: http://www.google-melange.com/gci/task/view/google/gci2014/5240815429353472 for good measure, one task is exploring amber: http://www.google-melange.com/gci/task/view/google/gci2014/5825641580593152 what does all of that have to do with you? well, aside from the outreach to introduce pharo to students i'd like to invite your feedback on the tasks, and i am wondering if you have suggestions for other tasks that students could work on. essentially this is an opportunity for pharo (and other smalltalk projects) to participate in google code-in. FOSSASIA is inviting Free Software and Open Source projects to join as mentors. (well, primarily asian projects, but since Free Software and Open Source are global that is hard to pin down. i am in china, so...) but even if you don't join as mentors, if you have tasks for one of your projects that would be suitable, i can put them up, if i can mentor them. (and if they are easy enough for beginners, then i probably can) google code-in ends on the 20th of january, so there is still time for students to pick up a few more smalltalk tasks. 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 BLUG secretary beijinglug.org foresight developer foresightlinux.org realss.com unix sysadmin Martin BÃ¤hr working in china http://societyserver.org/mbaehr/

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ZnClient Error - Improper store into indexable object
by Edward Povazan Dec. 29, 2014

Dec. 29, 2014

I am playing around with Zinc, and I get an "Error - Improper store into indexable objectâ at ZnBufferedWriteStream>>nextPut: My Workspace: ----- | response | response := ZnClient new url:'http://amazon.com'; get; response. response writeOn: Transcript. Transcript flush ----- The reason is that instead of a Character, there is a SmallInteger of value 10 being added at ByteString>>at:put: (and 10 is a linefeed). Also the string in the entity is a WideString (ZnUTF8Encoder>>next:putAll:startingAt:toStream is where the choice is made to decode a ByteString vs WideString). Is this a bug? Running on Pharo 3. My newb debugging skills donât go further :( Other sites that fail are reddit.com, news.ycombinator.com. Thanks, -Ed

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Question on temporal variables in Workspace
by nacho Dec. 29, 2014

Dec. 29, 2014

Hi pharoers, In killion video tutorials I see that he uses variables not declaring them as temporal (that is | aVariable | ). If one does not declare variables as temporal in a workspace what kind of variables are them? Also why in the tutorial they appear in blue and in my workspace they appear in red as if there was something wrong? (actually if I declare all variables as temporal using | | then all turn tu blue). Thanks in advance and best regards Nacho ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/Question-on-temporal-variables-in-Workspace-tp4797161… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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Re: [Pharo-users] [squeak-dev] From Smalltalk to Squeak by Dan Ingalls at CHM 10/11/2001 (VPRI 797)
by Trygve Reenskaug Dec. 28, 2014

Dec. 28, 2014

On 25.12.2014 01:22, Yoshiki Ohshima wrote: > A holiday present from the past! I digitized a video tape that VPRI > has and uploaded: > http://youtu.be/4ki2AQvneD8 > > Hope you enjoy it! > Dear Dan, Thank you for taking the trouble to record the history of Smalltalk history; I think it is both interesting and important to understand how the Smalltalk technology evolved. I hear you refer to Smalltalk as a programming language. Most of the programmers I know will misunderstand this. To them, a program is a text written in a programming language. The text is the Real Thing, the executable is derived. Contrast with Alan's definition of object orientation: Objects are like computers communicating through a very fast network. With Smalltalk, communication became a first class citizen of computing. The Real Thing is now a universe of communicating objects. Objects are mustered on the fly to perform a task. There is no "Smalltalk Language" in the common sense of the word. It is true that Smalltalk releases have a default language for compiling methods within a class. The compiler is private to the class; other classes may use different compilers and, therefore, different languages. For example, VisualWorks had a class where the methods were written in SQL. My main objection to calling Smalltalk a programing language is that it belittles its importance. IMO, Alan's concept of object orientation that is reified in Smalltalk is the the most important software invention since the first programming languages in the 1950s. It heralds an entirely new way of thinking about computing by replacing the underlying digital computer with a universe of communicating entities. I call it an /object computer/. (I see signs of this idea cropping up in other contexts as for example in "Unikernels: Rise of the Virtual Library Operating System <http://queue.acm.org/detail.cfm?id=2566628>"). We are only scratching the surface of the object computer's capabilities. I hope we in the coming years will deepen our understanding of what this invention entails and create powerful ways to exploit it. Squeak and its derivatives give us a flying start. I wish you all a productive and Happy New Year --Trygve -- Trygve Reenskaug mailto: trygver(a)ifi.uio.no Morgedalsvn. 5A http://folk.uio.no/trygver/ N-0378 Oslo http://fullOO.info Norway Tel: (+47) 22 49 57 27

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Re: [Pharo-users] Traveling to PharoDays
by Joachim Tuchel Dec. 28, 2014

Dec. 28, 2014

Interesting. A EU citizen flying from Munich to Brussels on transit to Paris has to be checked at the Belgian/French Border? But I absolutely buy into your connection argument for Brussels Airport... Unfortunately, I will not have time to come to Pharo Days 2015. I hope some sessions willbe recorded. Not a replacement for the networking... Joachim stepharo <stepharo(a)free.fr> schrieb: > >Le 27/12/14 14:08, Joachim Tuchel a Ã©crit : >> Doesn't the Thalys from Brussels to Paris stop in Lille? > >Yes it does. >Now you have to pay attention that you have to be really on time because >you have to pass a scan with your luggages and a border check. >I tend to avoid to take it because this is not fun. > > >> ClÃ©ment Bera <bera.clement(a)gmail.com> schrieb: >> >> There's a direct train from Paris CDG airport to Lille. It's usually >> more complex to go from brussels airport to Lille. >> >> There's an airport in Lille but there's very few flights from there >> (only to Marseilles and Porto AFAIK). >> >> 2014-12-27 12:21 GMT+01:00 Udo Schneider <udo.schneider(a)homeaddress.de >> <mailto:udo.schneider@homeaddress.de>>: >> >> All, >> >> what's the best international Airport to reach Lille? I'm >> currently thinking of flying to Brussels and take a train from >> there? Any other recommendations? >> >> CU, >> >> Udo >> >> >> >

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Re: [Pharo-users] Traveling to PharoDays
by Joachim Tuchel Dec. 28, 2014

Dec. 28, 2014

Doesn't the Thalys from Brussels to Paris stop in Lille? ClÃ©ment Bera <bera.clement(a)gmail.com> schrieb: >There's a direct train from Paris CDG airport to Lille. It's usually more >complex to go from brussels airport to Lille. > >There's an airport in Lille but there's very few flights from there (only >to Marseilles and Porto AFAIK). > >2014-12-27 12:21 GMT+01:00 Udo Schneider <udo.schneider(a)homeaddress.de>: > >> All, >> >> what's the best international Airport to reach Lille? I'm currently >> thinking of flying to Brussels and take a train from there? Any other >> recommendations? >> >> CU, >> >> Udo >> >> >>

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