Squeak-dev March 2001

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139 participants
508 discussions

Re: [newbie] how does Object implement new?
by Karl Wilson 30 Mar '01

30 Mar '01

Thanks Jecel, I had the "class" button selected when looking at Object and thought I was looking at the methods which the Object class understood - didn't realize there was a whole other hierarchy on the class side - why doesn't it say something like: ProtoObject class subclass #Object class instanceVariableNames: '' and why can't you spawn a class side heirarchy? Behavior ClassDescription Class ProtoObject class Object class I am sure this will all make sense after awhile. Thanks again. Karl >the first thing you must ask yourself is if the method you are looking >for is understood by instances of Object (and so is found in Object >itself) or by Object itself (and so is found in "Object class"). > >#new is the second case (as you can see by which button is selected in >the system browser: instance/comment/class) and so you must ask who is >the superclass of "Object class" and *not* who is the superclass of >"Object". It is easier if you "Object class inspect" and then keep >following the superclass links. You will end up in "Behavior class" >like you (almost) expected. > >-- Jecel

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Re: [newbie] how does Object implement new?
by Richard A. O'Keefe 30 Mar '01

30 Mar '01

How does Object (or ProtoObject) implement new? It doesn't. #new is a *class* method. Box is a Class. Printing "Box isKindOf: Class" => true. More precisely, Box is an instance of (Box class) which is a direct subclass of Class. ProtoObject Object Behavior ClassDescription Class (Box class) You'll find #new and #new: in Behaviour. Behavior>>new <primitive 70> ^self basicNew This means "run primitive number 70 in the VM. If that fails, return (self basicNew)." It is normal to override #new, but not to override #basicNew. Let's look at that: Behavior>>basicNew <primitive 70> self isVariable ifTrue: [^self basicNew: 0]. Smalltalk signalLowSpace. ^self basicNew. To find out more, you'd have to look at primitive 70, which you might think means fishing around in assembly code or C. But no! The Squeak VM is written in (a subset of) Smalltalk, and you can look at Interpreter>>primitiveNew in the Smalltalk browser!

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Re: Cool Hardware for Squeak
by Aaron J Reichow 29 Mar '01

29 Mar '01

On Thu, 29 Mar 2001 squeak(a)sysa.barnett.sk wrote: > Hi folks, look at this : > > http://www.agendacomputing.com/ That's all fine and dandy, but it's still seems a little vaporous. I know dev units were shipped out a while back, and there seems to be a supposed consumer ship date (4/3), but then again, it was originally supposed to ship back in October... In any case, I too would love to see if we can get Squeak practically working on devices with less umph than the iPaq. Aaron Aaron Reichow :: Twin Ports ACM VP :: http://www.d.umn.edu/~reic0024/ "The profit system follows the path of least resistance and following the path of least resistance is what makes a river crooked." -U. Utah Phillips

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MIDIFileWriter beta release
by Yisrael Lowenstein 29 Mar '01

29 Mar '01

Hi squeakers... I have been working on a MIDIFileWriter for part of my senior design project with Mark Guzdial...and I think I have it working pretty well...there are still a few more features I need to implement and things I need to improve slightly, but I think that the core is done. So I am releasing this beta for the general squeak community to play with and test...hopefully you guys can help me find the problems ...I set up http://guzdial.cc.gatech.edu:8080/squeakers.179 for people to let me know what can use improving and any interesting anomalies they encounter. The test code to let you know how to use it is in the class comments section. Thanks for your help! Lushi o |Yisrael Lowenstein: Computer Science Senior at GaTech & CS1311TA () o|lushi(a)bigfoot.com; gte356h(a)prism.gatech.edu; lushi(a)cc.gatech.edu o_/||\/ |"Before you criticize a man, walk a mile in his shoes. That way || | when you do criticize him, you'll be a mile away and have his _/\_ | shoes." - Unknown AIM: YisraelL ICQ: 1037061 Class Schedule: http://www.prism.gatech.edu/~gte356h/schedule/

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Re: making it difficult for beginners
by Doug Way 29 Mar '01

29 Mar '01

Sounds great! Thanks for offering to do this extra work. I'm glad that Karl suggested making individual VM's available... For example, if I wanted to provide a stripped-down (cross-platform) Squeak application on my website as an .image file, I could direct people to the ftp site to get just the VM for their platform. They wouldn't need to download the whole vm/image/sources/changes bundle. - Doug Way dway(a)riskmetrics.com Bruce ONeel wrote: > > Ok, here's my proposal built on Karl's. I will only change the > 3.0 dir and I will remove the 3.1_alpha dir and include it under > 3.0. > > squeak 3.0/ > read-me.txt > platform-independent(SqueakCentral)/ > squeak3.0-changesetnumber.zip > squeaksources > mac/ > macfull.changesetnumber.sit > mac-vm.sit > extra-mac-vm-plugins/ > extra-mac-vm-plugin.sit > win/ > winfull.changesetnumber.zip > win-vm.zip > win-vm-src.zip > extra-win-vm-plugins/ > extra-win-vm-plugin.zip > unix-linux/ > x86/ > various-distro.changesetnumber.rpm > various-distro.changesetnumber.db > ppc/ > various-distro.changesetnumber.rpm > various-distro.changesetnumberdb > unstable-testPilot > Squeak3.1-alphachangesetnumber.zip > > Sound ok? Ted, if this is ok I'll change the ftp site and send you a > new download.html file. In fact, I'll send you a new one with the > changes that others have suggested... > > cheers > > bruce

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Re: [OT]Re: Browser Plugin 3.0 update
by Ned Konz 29 Mar '01

29 Mar '01

On Thursday 29 March 2001 09:38, Andy Stoffel wrote: > Ned Konz wrote: > > * I don't need to know your file extension (.html) (that's what MIME > > Content-type headers are for!) > > [... continuing off-topic ...] > Unfortunately, there is a well known web browser that is known > to use file extensions INSTEAD OF Content-type headers. > (This isn't just urban legend. I work with an operating system > on a daily basis (OpenVMS [the 'Open' is silent]) that runs > headlong into this issue. (e.g. Assorted versions of > Internet Explorer ASSUME the anything ending in .com > is a binary image. Oops.... on VMS they are ASCII DCL > command files (the DOS equivalent being a .BAT) and > if I attempted to use IE to look at one of these it > attempts to download it. I don't use Scamper on a > regular basis so I'm not aware of how IT handles such > things.) This is an excellent reason not to use file extensions AT ALL: it forces the browser to use the MIME types! It's really just programmer laziness that makes us see URL's as a mirror of file systems, anyway... I'd rather not know how you've organized your web server's file system. Just give me a clean, unchanging URI space that I can bookmark. Free of implementation details (.html/.gif/.jpg extensions, server names, .cgi/.jsp, etc.). -- Ned Konz currently: Stanwood, WA email: ned(a)bike-nomad.com homepage: http://bike-nomad.com

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Re: making it difficult for beginners
by Bruce ONeel 29 Mar '01

29 Mar '01

Ok, here's my proposal built on Karl's. I will only change the 3.0 dir and I will remove the 3.1_alpha dir and include it under 3.0. squeak 3.0/ read-me.txt platform-independent(SqueakCentral)/ squeak3.0-changesetnumber.zip squeaksources mac/ macfull.changesetnumber.sit mac-vm.sit extra-mac-vm-plugins/ extra-mac-vm-plugin.sit win/ winfull.changesetnumber.zip win-vm.zip win-vm-src.zip extra-win-vm-plugins/ extra-win-vm-plugin.zip unix-linux/ x86/ various-distro.changesetnumber.rpm various-distro.changesetnumber.db ppc/ various-distro.changesetnumber.rpm various-distro.changesetnumberdb unstable-testPilot Squeak3.1-alphachangesetnumber.zip Sound ok? Ted, if this is ok I'll change the ftp site and send you a new download.html file. In fact, I'll send you a new one with the changes that others have suggested... cheers bruce

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RE: [newbie] how does Object implement new?
by Peter Crowther 29 Mar '01

29 Mar '01

> From: Karl Wilson [mailto:khwilson@bigfoot.com] > How does Object (or ProtoObject) implement new? Welcome to The Metaphysics of Smalltalk :-). > When you write Box>>new (Box is a subclass of Object): > > new > ^super new initialize. > > where is the new that it is finding? In 'Box class' (which is a Metaclass) or a superclass thereof. Metaclasses are how Smalltalk gets around the problem that you need a hierarchy of instance methods that stops at Object, but somehow you need to do something different with the code for classes. Take a look at classes and metaclasses. http://wiki.cs.uiuc.edu/VisualWorks/How+do+metaclasses+work%3F would be one place to look [yeah, I know, it says VisualWorks...] - Peter

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Re: [OT]Re: Browser Plugin 3.0 update
by Michael Rueger 29 Mar '01

29 Mar '01

> headlong into this issue. (e.g. Assorted versions of > Internet Explorer ASSUME the anything ending in .com > is a binary image. Oops.... on VMS they are ASCII DCL > command files (the DOS equivalent being a .BAT) and It can be even worse when IE looks at the file and regardless of the extension decides it's e.g. a zip file (happens with Squeak project .pr files). I hate things that do something automatically, that's why I work with computers :-] Michael -- "To improve is to change, to be perfect is to change often." Winston Churchill +------------------------------------------------------------+ | Michael Rueger m.rueger(a)acm.org ++1 (310) 937 7196 | +------------------------------------------------------------+

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Re: [OT]Re: Browser Plugin 3.0 update
by Bert Freudenberg 29 Mar '01

29 Mar '01

On Wed, 28 Mar 2001, Michael Rueger wrote: > If somebody would write a mod_squeak for Apache, that wouldn't need to > happen ;-) Actually, mod_rewrite is very handy for hiding such embarrasing details ;-) Also, http://www.squeakland.org/projects/games/someproject.001.html looks much better ... Btw, why is the download server named SqueakAlpha.org? Also, why is my Linux Netscape detected as Mac? ;-) Also, please stick to the HTML (ISO Latin 1) character set - the quotes in /author/essayes.html are wrong. And: thanks for making this :) -- Bert

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