Squeak-dev July 2006

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132 participants
241 discussions

DrGeoII, dynamic geometry for Squeak, released under LGPL
by Hilaire Fernandes 05 Jul '06

05 Jul '06

I am please to announce the distribution of DrGeoII, an interactive geometry framework for Squeak, under the LGPL http://www.squeaksource.com/DrGeoII.html DrGeoII is roughly based on previous DrGeo (http://www.ofset.org/drgeo) It is far to be finished, but it is already in a quite well polished and usable state. Hilaire Fernandes

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Re: Shouldn't 7r6.5 be the same as 7r65 * 0.1
by ncellier＠ifrance.com 05 Jul '06

05 Jul '06

Yes, 7r6.5e4 is equivalent to 7r65000.0 That is the natural behavior we would expect i think To be more precise, however, the number on the right of exponent e is interpreted in base 10. let us take another example: 7r6.5e12 is (6*7^0+5*7^-1) * 7^12 that is 6*7^12+5*7^11 it is not interpreted as (6*7^0+5*7^-1) * 7^ 7r12 that is 6*7^9+5*7^8 Nicolas Klaus D. Witzel: > Thank you Wolfgang (did you see the response from Ken). > > But one thing remains: in 7r6.5e4 the exponent is also computed base 7, > contrary to the comment in NumberParsingTest>>#testFloatReadWithRadix. > > /Klaus > > On Tue, 04 Jul 2006 20:11:04 +0200, Wolfgang Helbig wrote: > > > Klaus, you asked: > >> Would some good soul please explain what > >> > >> Number readFrom: '7r6.5' > > > > And here is the good soul's answer: > > > > 7r6.5 = 6*7^0 + 5 * 7^(-1) = 6 + 5/7 = 6.714285714285... with the last > > 6 digits repeating at infinitum. > > > > Whereas 7r65 * 0.1 should evaluate to > > 7r65 * 0.1 = (6*7^1 + 5*7^0) * 10^-1 = (6*7 + 5) / 10 = 4.7 > > > > (Notation: "^" is the exponentation operator, like 3^2 = 3 * 3 = 9). > > > > Greetings, > > Wolfgang > > > > -- > > "Dijkstra is right, but you don't say such things!" > > (A less courageous programmer) > > > > > > > > > > ________________________________________________________________________ iFRANCE, exprimez-vous ! http://web.ifrance.com

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Re: Shouldn't 7r6.5 be the same as 7r65 * 0.1
by Wolfgang Helbig 05 Jul '06

05 Jul '06

Klaus, you asked: >Would some good soul please explain what > > Number readFrom: '7r6.5' And here is the good soul's answer: 7r6.5 = 6*7^0 + 5 * 7^(-1) = 6 + 5/7 = 6.714285714285... with the last 6 digits repeating at infinitum. Whereas 7r65 * 0.1 should evaluate to 7r65 * 0.1 = (6*7^1 + 5*7^0) * 10^-1 = (6*7 + 5) / 10 = 4.7 (Notation: "^" is the exponentation operator, like 3^2 = 3 * 3 = 9). Greetings, Wolfgang -- "Dijkstra is right, but you don't say such things!" (A less courageous programmer)

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[ANN] Squeak3.9b-7036 available
by stéphane ducasse 05 Jul '06

05 Jul '06

- fix pragmas - fix some traits.... Thanks lukas and adrian... Stef

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Re: Testing if a String is a number
by ncellier＠ifrance.com 05 Jul '06

05 Jul '06

However, there are two details: 1) maybe you have to care about separators for example ' 10' is Number will be true, while '10 ' isNumber will be false think of changing ^stream skipSeparators; atEnd 2) the #isNumber method name is questionnable Current implementation in virgin images is a short cut of (isKindOf: Number), Most senders of isNumber will really expect a Number, not a String try (2 * '4') or ('3.14' sin) in your image, and you will see what i mean. If you want strings to become unevaled (differed evaluation) objects, then it makes me think of a lisp approach, String quotes being equivalent somehow to lisp uneval quote... Nicolas Damien Cassou: > ncellier(a)ifrance.com wrote: > > I suggest you use my Squeak NumberParser (See http://bugs.impara.de/view.php?id=3512 ) which has error handling a little bit more developped than just answering zero... > > > > You could simply test is aNumber is read without error from (self readStream), and assert the stream atEnd. > > Your parser works perfectly. Now, #stringIsNumber should be implemented as: > > stringIsNumber > | stream | > stream _ self readStream. > SqNumberParser parse: stream onError: [^ false]. > ^ stream atEnd > > > Next line is a subliminal message, don't read it please ! > It would be cool to have it in the base image, please include it > > > Thank you > ________________________________________________________________________ iFRANCE, exprimez-vous ! http://web.ifrance.com

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Re: Testing if a String is a number
by ncellier＠ifrance.com 05 Jul '06

05 Jul '06

Hi Damien I suggest you use my Squeak NumberParser (See http://bugs.impara.de/view.php?id=3512 ) which has error handling a little bit more developped than just answering zero... You could simply test is aNumber is read without error from (self readStream), and assert the stream atEnd. Nicolas Damien Cassou: > Hi, > > I'm surprised there is no #isNumber selector for strings. If I want to > detect if a string is a number or not, it's not so easy. One of the > possible implementation would be: > > String>>isNumber > value := self asNumber. > value isZero > ifFalse: [^ true] > ifTrue: [^ self first = $0] > > > But this is buggy and incomplete: > > 'dfdfd' isNumber false <- correct > '12' isNumber true <- correct > '0' isNumber true <- correct > '0ef' isNumber true <- Wrong ! > '2r0' isNumber false <- Wrong ! > > > Should I open a bug report on Mantis ? > > ________________________________________________________________________ iFRANCE, exprimez-vous ! http://web.ifrance.com

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Testing if a String is a number
by Damien Cassou 05 Jul '06

05 Jul '06

Hi, I'm surprised there is no #isNumber selector for strings. If I want to detect if a string is a number or not, it's not so easy. One of the possible implementation would be: String>>isNumber value := self asNumber. value isZero ifFalse: [^ true] ifTrue: [^ self first = $0] But this is buggy and incomplete: 'dfdfd' isNumber false <- correct '12' isNumber true <- correct '0' isNumber true <- correct '0ef' isNumber true <- Wrong ! '2r0' isNumber false <- Wrong ! Should I open a bug report on Mantis ?

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Importing Visualworks code in Squeak
by Alexandre Bergel 05 Jul '06

05 Jul '06

hi! I would like to port Mondrian to Squeak. Mondrian is originally written in Visualworks. But when I extract the code from Visualworks, I obtain an XML description. Here is an excerpt: -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= <?xml version="1.0"?> <st-source> <time-stamp>From VisualWorksÂ® NonCommercial, 7.4 of December 5, 2005 on June 26, 2006 at 5:26:50 pm</time-stamp>  <component-property> <name>MondrianDevelopment</name> <type>bundle</type> <property>developmentPrerequisites</property> <value>#(#(#bundle 'CodeFooDevelopment' ''))</value> </component-property> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Is there an importer somewhere to load some code from visualworks into Squeak ? Nothing on Squeakmap and Squeaksource seems to correspond... Anyonw knows about Rosetta ? The work from Joseph... Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.cs.tcd.ie/Alexandre.Bergel ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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Re: can not install Chronos
by Philippe Marschall 05 Jul '06

05 Jul '06

Wow, this is great news. I'm looking forward to it. Philippe 2006/7/5, Alan Lovejoy <squeak-dev.sourcery(a)forum-mail.net>: > Phillipe, > > The next version of the Passport package for Squeak will have Passport's > HttpRequest renamed to PPHttpRequest. It will also be distributed as a SAR > (which I believe will also make it have the format of a SqueakSource > package, although Avi currently is the sole admin of the Chronos package on > SqueakSource.) > > You should expect the next version to be available by Sunday evening, 9 July > (US Pacific Time.) > > --Alan > > -----Original Message----- > From: squeak-dev-bounces(a)lists.squeakfoundation.org > [mailto:squeak-dev-bounces@lists.squeakfoundation.org] On Behalf Of Philippe > Marschall > Sent: Tuesday, July 04, 2006 12:09 PM > To: The general-purpose Squeak developers list > Subject: Re: can not install Chronos > > > The Passport package, on which Chronos depends, defines a class named > > HttpRequest. Apparently, you have some other package installed that > > also defines a class named HttpRequest. > > Well me and anybody with Seaside :( > > > You will have to rename one of the "HttpRequest" classes to something > > else, given Squeak's lack of support for namespaces. > > Well, this and I am not sure I really need or want all these overrides. > Either changing Kom or Passport and Passport-Squeak. > Passport-Squeak is the Squeak Password compatibilty/implementation layer, is > that correct? Personally I'd prefer the later but for that it would help to > have it as let's say a SqueakSource package. > > Philippe > > > >

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Squackers 5 July 2006: reminder
by Craig Latta 05 Jul '06

05 Jul '06

Hi-- Just a reminder that the next San Francisco Bay Area Squackers (Squeak hackers) meeting is from 8-10pm pacific time on Wednesday, 5 July (about 21 hours from when I sent this). Please let me know if you need directions, or if you have something you'd like to show (either in person or via VNC). We'll be doing audio conferencing via AIM as well. My ID is "threnkeldwingnut"; just ask for an invitation. thanks! -C -- Craig Latta http://netjam.org/resume

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