May 2013 - Pharo-dev - lists.pharo.org

[Pharo-project] XPath issue ?
by Herve Verjus May 18, 2013

May 18, 2013

Dear All, I try a very simple example: mydoc.xml document: <?xml version="1.0" encoding="UTF-8" ?> <first> <second> <item type="attvalue">nodevalue</item> </second> </first> And the Pharo code found in the book.pharo-project.org: | doc results | doc := XMLDOMParser parseFileNamed: 'mydoc.xml'. results := ( XPath for: 'first' ) in: doc. results explore As a result, I obtain an empty OrderedCollection...It should contain an element. Then a make some changes using different XPath expressions (i.e. '/first/second/item/@type", etc.) but no way. Then I discover the first element of the XPath expression must not be the root of the XML doc. If I change the mydoc.xml, introducing a new root element: <?xml version="1.0" encoding="UTF-8" ?> <foo> <first> <second> <item type="attvalue">nodevalue</item> </second> </first> </foo> Everything is ok (the same code as above). Here, XPath assumes that the first tag we are looking for is not the root of the doc, otherwise it fails. I'm not so sure but it seems that such implementation doesn't follow the XPath specs. I tried another example from http://www.w3schools.com/xpath/xpath_syntax.asp and same results: I obtain an empty collection when using an XPath expression beginning with the 'bookstore' tag, the root element of the doc: | doc results | doc := XMLDOMParser parseFileNamed: 'books.xml'. results := ( XPath for: '/bookstore' ) in: doc. results explore Maybe, I missed something... Note: I have had to replace the isTag (deprecated) with isElement in some piece of XPath code. Cheers, Herve

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Small Methods dont need comments , true or myth ?
by dimitris chloupis May 18, 2013

May 18, 2013

I really enjoy smalltalk, every small thing that I discover every day. But there is one thing that really annoys me. The bold claim that small functions do not need comments. There is of course a level of truth that when a function/methods is well formated and follows the common logic rules of readable code a comment should not be needed for what it takes 10 lines or less of code to explain. But then that is also an illusion. The problem is that the code never explains the why. And why can be very important in understanding the code. Also a big issue I have with smalltalk in general. All this spaggeti mess I see unfold before my eyes in every library I see. One method calling another method which calls (excuse me, I should have said "sends a message") another and before you know you forget where you started and where is the end. Its the definition of Code Labyrinth. All this hectic browsing around could have been avoided so easily with a single comment. Its those moments you beg for a comment or some documentation. So my message to this list is to express my discomfort on this and ask Is it me or is this a really bad code practice afterall ? I am new to smalltalk so maybe I miss something or maybe things get easier in the future with more experience. But something it tells me inside that I will never get used to this , maybe I will learn to tolerate it , but its so far away from my way of thinking I dont think it has much chance into integrating in my brain. The thing is that I am quite the opposite , I am a comment and documentation freak. You may think I do it just to be awared the oscar of amazing readable coding but nothing can be further from the truth. I may be coding for 25 years now but it was never something serious , I am no pro and certainly not a serious coder. I just like to mess around with code, thats all. For me its a matter of survivability , if I dont comment or document I will quickly forget why I code these things anyway. Its so easy for me to forget and be confused and I find in this case smalltalk code is not as forging to coders like me. So I would like to hear you thoughts on this as much more experience smalltalk coders than me.Â I would like to note here that I am also a big fan of small methods and that my questionis not related to whether methods should be kept small and readable but whether comments are really needed for those methods.

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[update 3.0] #30144
by Marcus Denker May 18, 2013

May 18, 2013

30144 ----- 10666 FileList should work on any FileSystem https://pharo.fogbugz.com/f/cases/10666 10664 Unify and clean a bit the CommandLine class comments https://pharo.fogbugz.com/f/cases/10664 10663 RPackageOrganizer out of sync https://pharo.fogbugz.com/f/cases/10663 Diff information: http://smalltalkhub.com/mc/Pharo/Pharo30/main/UpdateStreamer-Core-MarcusDen… http://smalltalkhub.com/mc/Pharo/Pharo30/main/ToolsTest-MarcusDenker.denker… http://smalltalkhub.com/mc/Pharo/Pharo30/main/Tools-MarcusDenker.1124.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/System-CommandLine-MarcusDenk… http://smalltalkhub.com/mc/Pharo/Pharo30/main/HudsonBuildTools20-MarcusDenk… http://smalltalkhub.com/mc/Pharo/Pharo30/main/FuelCommandLineHandler-Marcus… http://smalltalkhub.com/mc/Pharo/Pharo30/main/ConfigurationCommandLineHandl… http://smalltalkhub.com/mc/Pharo/Pharo30/main/AndreasProfiler-MarcusDenker.…

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TxTextLayout
by Camillo Bruni May 18, 2013

May 18, 2013

I have a question concerning the new TxText layout. How hard is it support inline non-text nodes (aka inline morphs) in a text layout? My dream is still to be able to drag and drop an "instance" from an inspector to a workspace and do some operations on it using standard smalltalk. The only difference here would be instead of using a variable or expression to get an instance of something I would have a textual/visual node directly representing an instance! best regard, camillo

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Stop saving the image at the end of an 'eval' script!
by Damien Cassou May 18, 2013

May 18, 2013

Hi, If you have scripts you call with the command line argument 'eval' like this: ./pharo eval '1+2. Smalltalk snapshot: true andQuit: true' you will get into problems in Pharo 2.0 (e.g., a debugger with 'stdout is closed' message). Pharo 3.0 does not have this problem. The correct way to do that in Pharo 2.0 is: ./pharo eval --save '1+2' which is non-arguably much cleaner :-) -- Damien Cassou http://damiencassou.seasidehosting.st "Success is the ability to go from one failure to another without losing enthusiasm." Winston Churchill

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Penelope does not like my email...
by Ciprian Teodorov May 17, 2013

May 17, 2013

Hi guys, Some time ago there were some issues with email addresses with dot... are they solved? Today I've tried (again) to register with penelope and Invalid email address. My email is: ciprian.teodorov(a)gmail.com Can I use it or do I have to have a dot-less one? cheers, Ciprian -- Dr. Ciprian TEODOROV IngÃ©nieur DÃ©veloppement CAO tÃ©l : 06 08 54 73 48 mail : ciprian.teodorov(a)gmail.com www.teodorov.ro

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[update 3.0] #30143
by Marcus Denker May 17, 2013

May 17, 2013

30143 ----- 10615 RBMethodNode classBinding: move it to compilationContext https://pharo.fogbugz.com/f/cases/10615/ ... and update Opal to the latest version Diff information: http://smalltalkhub.com/mc/Pharo/Pharo30/main/OpalCompiler-Tests-MarcusDenk… http://smalltalkhub.com/mc/Pharo/Pharo30/main/OpalCompiler-Core-MarcusDenke… http://smalltalkhub.com/mc/Pharo/Pharo30/main/AST-Core-MarcusDenker.154.diff

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[update 3.0] #30142
by Marcus Denker May 17, 2013

May 17, 2013

30142 ----- 10647 Implement Scanner scanTokens in new compilation chain https://pharo.fogbugz.com/f/cases/10647 Diff information: http://smalltalkhub.com/mc/Pharo/Pharo30/main/AST-Core-MarcusDenker.152.diff

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ConfigurationOfMetacello directly in Pharo
by Pavel Krivanek May 17, 2013

May 17, 2013

Hi, when I load Metacello to the Pharo Kernel, I still use the SqueakSource repository and use ConfigurationOfMetacello. It is a relict from times when Metacello was not directly loaded in the standard image. We need to change to have the Metacello in the same version that is in Pharo. And we have several options: 1) load Metacello directly from Pharo30 repository on Smalltalkhub using Gofer 2) make ConfigurationOfMetacello part of Pharo and load it from Pharo30 repository on Smalltalkhub using its own configuration and Gofer 3) to have ConfiguratonOfMetacello in the Smalltalkhub repository but do not have it preloaded in the standard image What do you think? -- Pavel

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[update 3.0] #30141
by Marcus Denker May 17, 2013

May 17, 2013

30141 ----- 10153 Dependency Symbol -> Scanner https://pharo.fogbugz.com/f/cases/10153 Diff information: http://smalltalkhub.com/mc/Pharo/Pharo30/main/Collections-Strings-MarcusDen…

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