Squeak-dev January 2000

squeak-dev@lists.squeakfoundation.org

131 participants
468 discussions

Re: How to find comp.lang.smalltalk?
by Doug Way 01 Feb '00

01 Feb '00

Also, if you're desperate, you can always read newsgroups directly via remarq.com or deja.com with any browser. For comp.lang.smalltalk, that would be: http://www.remarq.com/threads.asp?g=comp%2Elang%2Esmalltalk&nav=LAST or http://deja.com/[ST_rn=bg]/topics_bg.xp?search=topic&group=comp.lang.smallt… (I tend to prefer remarq.com, since you can read many messages in a thread at one time, and the ads are slightly less obtrusive.) - Doug Way EAI/Transom Technologies, Ann Arbor, MI http://www.transom.com dway(a)mat.net, @eai.com On Sun, 30 Jan 2000, Miles Fidelman wrote: > On Sun, 30 Jan 2000, Chris Macie wrote: > > > Could someone please remind me how to connect with comp.lang.smalltalk. > > > > Using Netscape 4.04, I think it first finding the news server (default here > > 'news', DNS not found). > > I think you need to contact your ISP for the name of your news server. > > > ************************************************************************** > Network Technology Corporation PO Box 600618 > Miles R. Fidelman, President Newtonville, MA 02460-0006 > mfidelman(a)ntcorp.com 617-558-3698 > http://www.ntcorp.com fax: 617-630-8946 > ************************************************************************** > >

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Re: More Widgets for Squeak....
by Doug Way 01 Feb '00

01 Feb '00

On Mon, 31 Jan 2000, Piero Campanelli wrote: > Sorry if I haven't read previous list messages.... > I am building user interfaces with Squeak, but i think (at the moment) > there are few widgets (for MVC). In my standard image there is only Button, > List, TextBox and few others. Is there any project to enhance the number of > widgets ????????? > Is there any change set ??? If you really need more widgets, you'll probably have to use Morphic rather than MVC. There are considerably more widgets available in Morphic, such as sliders, vertical/horizontal scrollbars, the SimpleHierarchicalListMorph (tree), etc. To see some of them, check out "new morph..." from the main menu within Morphic. Also, there seem to be more changesets around related to Morphic widgets, than to MVC widgets. See the Swiki page on Morphic for more information and tutorials, etc. ( http://minnow.cc.gatech.edu/squeak/30 ) - Doug Way EAI/Transom Technologies, Ann Arbor, MI http://www.transom.com dway(a)mat.net, @eai.com

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Re: Full Closures - when do they close?
by Robert Withers 01 Feb '00

01 Feb '00

Vassili Bykov wrote: > > From: slosher(a)vnet.net [mailto:slosher@vnet.net]On Behalf Of Robert > Withers > > If this was: > > > > Method > > | answer i | > > answer := Array new: 5. > > i := 1. > > answer at: i put: [:arg | arg * i]]. > > i := 2. > > answer at: i put: [:arg | arg * i]]. > > i := 3. > > answer at: i put: [:arg | arg * i]]. > > i := 4. > > answer at: i put: [:arg | arg * i]]. > > i := 5. > > answer at: i put: [:arg | arg * i]]. > > ^answer > > > > Then all five blocks would have i = 5. Is it so? > > Yes, and this is what is essentially going on in Squeak. Here is an SUnit test case for the two examples going around. The one for Disjoint Environment Blocks which only work with #fixTemps and one for Sync Environment Blocks which only work without Fixtemps. I am actually testing all four options. It is real messy and not very clear what is being tested. This is my first SUnit test so I'll claim inexperience. :) Here are the tests and their outcomes. The #testDisjointEnvironmentBlocksWithFixTemps Succeeds. The #testDisjointEnvironmentBlocksWithoutFixTemps Fails. | answer | answer := Array new: 5. 1 to: 5 do: [:i | answer at: i put: [:arg | arg * i] fixTemps]. ^answer The #testSyncEnvironmentBlocksWithFixTemps Fails. The #testSyncEnvironmentBlocksWithoutFixTemps Succeeds. | foo | ^Array with: [:arg | foo := arg] with: [foo] Apologies for not distributing clearer code. Perhaps this can help us, with cleanup, into the future -Rob > --Vassili -- -------------------------------------------------- Smalltalking by choice. Isn't it nice to have one! 'From Squeak2.7 of 5 January 2000 [latest update: #1762] on 31 January 2000 at 6:06:17 pm'! TestCase subclass: #TestClosureCase instanceVariableNames: '' classVariableNames: '' poolDictionaries: '' category: 'Closure-Test'! !TestClosureCase reorganize! ('running' constructDisjointEnvironmentBlocksWithFixTemps constructDisjointEnvironmentBlocksWithoutFixTemps constructSyncEnvironmentBlocksWithFixTemps constructSyncEnvironmentBlocksWithoutFixTemps setUp testDisjointEnvironmentWithFixTemps testDisjointEnvironmentWithoutFixTemps testSyncEnvironmentWithFixTemps testSyncEnvironmentWithoutFixTemps) ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 17:39'! constructDisjointEnvironmentBlocksWithFixTemps |array| array := Array new: 5. 1 to: 5 do: [:i | array at: i put: [ i] fixTemps]. ^array ! ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 17:39'! constructDisjointEnvironmentBlocksWithoutFixTemps |array| array := Array new: 5. 1 to: 5 do: [:i | array at: i put: [ i] ]. ^array ! ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 17:42'! constructSyncEnvironmentBlocksWithFixTemps |array result| result := 10. array := Array new: 2. array at: 1 put: [:arg | result := arg] fixTemps. array at: 2 put: [result] fixTemps. ^array ! ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 18:02'! constructSyncEnvironmentBlocksWithoutFixTemps |array result| result := 10. array := Array new: 2. array at: 1 put: [:arg | result := arg]. array at: 2 put: [result]. ^array ! ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 17:49'! setUp "Sets up the fixture. This method is called before a test is executed." ! ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 17:39'! testDisjointEnvironmentWithFixTemps |blockArray| blockArray := self constructDisjointEnvironmentBlocksWithFixTemps. self should: [|isCorrectValue| isCorrectValue := true. 1 to: 5 do: [:i | isCorrectValue := isCorrectValue & ( (blockArray at: i) value == i)]. isCorrectValue]. ! ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 17:56'! testDisjointEnvironmentWithoutFixTemps |blockArray| blockArray := self constructDisjointEnvironmentBlocksWithoutFixTemps. self should: [|isCorrectValue| isCorrectValue := true. 1 to: 5 do: [:i | isCorrectValue := isCorrectValue & ( (blockArray at: i) value == i)]. isCorrectValue]. ! ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 17:56'! testSyncEnvironmentWithFixTemps |blockArray| blockArray := self constructSyncEnvironmentBlocksWithFixTemps. self should: [ (blockArray at: 1) value: 5. (blockArray at: 2) value == 5]. ! ! !TestClosureCase methodsFor: 'running' stamp: 'rww 1/31/2000 17:46'! testSyncEnvironmentWithoutFixTemps |blockArray| blockArray := self constructSyncEnvironmentBlocksWithoutFixTemps. self should: [ (blockArray at: 1) value: 5. (blockArray at: 2) value == 5]. ! !

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RE: Multiple Returns, was Re: Common Lisp style macros in Smallta lk?
by Stewart MacLean 31 Jan '00

31 Jan '00

Not sure about continuations, but I'll have a stab at co-routines. Co-routines consist of two processes, each with it's own state and executing quasi concurrently. An example might be a producer and consumer process pair. Say P =()=> Q where they are connected via a stream. The process Q will block until P writes something to the stream. P's writing can be made either synchronous or asynchronous. Q is said to be re-entrant, as it preserves it's state between invocations. To implement this in Smalltalk you would have two processes, the scheduling of which would be controlled by a Semaphore. See SharedQueue. Using COBOL (what!?) you would need to separate out the state and have a goto to the particular resume point in the code, depending on it's previously suspended state. Hope this helps, Stewart > OK, I'll exhibit my ignorance :-). What are continuations, > and what are > they useful for? Same questions for coroutines. > > Bob Jarvis > Compuware @ Timken > > > -----Original Message----- > > From: Vassili Bykov [SMTP:vassili@objectpeople.com] > > Sent: Thursday, January 27, 2000 8:19 AM > > To: squeak(a)cs.uiuc.edu > > Subject: RE: Multiple Returns, was Re: Common Lisp style > macros in > > Smalltalk? > > > > > From: demiourgos(a)smalltalk.org [mailto:demiourgos@smalltalk.org] > > > But I have wondered from time to time -- not having deep > process-based > > > experience in Smalltalk (applications instead) -- how one > might go about > > > implementing coroutines or continuations in the manner of > Scheme. Or > > > are these things too far out of the Smalltalk model? > > > > I implemented continuations for Squeak a couple of year ago. Nobody > > seemed > > particularly impressed, so even if they are not far out of > the Smalltalk > > implementation, they are far out of the Smalltalk thinking. > > > > --Vassili >

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VOTE for Backdrop (was RE: Change the Squeak UI Look)
by Torsten.Bergmann＠phaidros.com 31 Jan '00

31 Jan '00

I would vote for including Stephans backdrop change set into the official release (http://w3.one.net/~swessels/squeak/mine/backdrops.19Nov929pm.cs). Torsten >-----Original Message----- >From: Stephan B. Wessels [mailto:stephan.wessels@sdrc.com] >Sent: Montag, 31. Januar 2000 19:02 >To: squeak(a)cs.uiuc.edu >Subject: Re: Change the Squeak UI Look > > >I wrote some code to do this which is avaiable via the swiki at >http://minnow.cc.gatech.edu/squeak/683. Take a look at the bottom of the web >page. This code works with V2.8a. > >Maybe that will help. > > - Steve >> Howdy, >> >> Torsten.Bergmann(a)phaidros.com wrote: >> > >> > ... >> > - open a file list, select a JPEG or GIF and select 'open image as >> > background' >> >> when i do this, the image is tiled. is there anyway to get it to center >> and stretch? >> -- >> >> \\//_

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Irregularly shaped main window
by Jerome E. Garcia 31 Jan '00

31 Jan '00

Hello everyone, Can anyone tell me how I would go about creating an irregularly shaped main Squeak window using a mask or a region definition? Would this require a VM change or can it be done in Smalltalk code? I am trying to duplicate the look and feel of an Internet assistant which we are developing. I think I can accomplish just about everything else we are doing in Smalltalk code. This is just part of my effort to get people interested in Squeak for doing multi-platform development. Thanks in advance for any suggestions. Jerome

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Re: Full Closures - when do they close?
by demiourgos＠smalltalk.org 31 Jan '00

31 Jan '00

On Sun, 30 January 2000, Robert Withers wrote: > > "demiourgos(a)smalltalk.org" wrote: [snip] > > -- I'm not sure this answered my question above (but Vassili addressed > in another post so let's base from there...) but you have raised some > other interesting issues, I think. I have recently become familiar with > Functional Language concepts (HOF, Lazy eval, currying, ...). One > interesting aspect was the ability of changing or adding state, in some > FPLs, would only store a diff to the original, for space complexity > savings. That's pretty neat. I believe that's what you talk about > below... > [snip] > >.....Indeed, > > most programs which use closures make and use one or two in very special > > and restricted places. > > -- I jive with that. Program structure should be modelled in classes, > not anonymous closures or complex exception systems. However, isn't it > of benefit to realize full closures? Well, actually, it depends upon what you're trying to do. I, in fact, disagree a bit with Vassili's discussion of shared substructures. Surely, one can share, with memory savings, when direct assignment to pointer fields is disallowed. But allowing it and thereby mutating shared substructures could be devastating or not, depending upon the application area. Again, I came to this from the idea of search and knowledge spaces in AI, where contexts or closures where intended to be a "cheap" way of modeling states of the world or knowledge. In that limited environment, the idea of closures is a powerful too. However, if I were using Smalltalk to do it, I very much would prefer working within a class that implements it rather than building it into the VM. Clearly, one can model these many worlds using many techniques, and not just those which are realized using the fundamentals of the computing environment one is using. I think, in fact, the closures and contexts discussed thusfar are, in terms of realizing programming constructs, an invention comparable to the conceit in poetry: They draw attention to themselves and really don't provide that much benefit, and certainly can be done in other ways. Maybe they would be useful if modeling knowledge structures, but I believe even that business is done in different ways these days. The only thing I'd like to think about which can be implemented using these closures is something like the classical coroutine, but even that doesn't need, IMO, the power of closures to be had. [snip] --jtg ______________________________________________________ Jan Theodore Galkowski www.smalltalk.org/ http://www.scguild.com/usr/1707I.html demiourgos(a)smalltalk.org www.marssociety.org/ ********************************************** PGP Key Fingerprint: 2757 F86D AA51 677D 38D7 964B 9A8D 7852 A494 3790 ********************************************** Get my Public Key from my home page at: http://home.stny.rr.com/algebraist/ ********************************************** ______________________________________________ Get free e-mail at http://www.britannica.com

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RE: Computer Modern Fonts/Mach 2
by agree＠carltonfields.com 31 Jan '00

31 Jan '00

> Good point. I'll get some together tonight. Great! > (Re: license) Open one up in a text editor and have a look! The license looks just fine, BSD-like in nature. The only limitation is carrying forward the copyright notices, which is a fair exchange. Do be sure to put the Copyright Notices somewhere approriate in the change-file or font-files (if you build and distribute as a Font-Set, the comment arena is a good place for that). COMMENT Copyright 1984-1989, 1994 Adobe Systems Incorporated. COMMENT Copyright 1988, 1994 Digital Equipment Corporation. COMMENT COMMENT Adobe is a trademark of Adobe Systems Incorporated which may be COMMENT registered in certain jurisdictions. COMMENT Permission to use these trademarks is hereby granted only in COMMENT association with the images described in this file. COMMENT COMMENT Permission to use, copy, modify, distribute and sell this software COMMENT and its documentation for any purpose and without fee is hereby COMMENT granted, provided that the above copyright notices appear in all COMMENT copies and that both those copyright notices and this permission COMMENT notice appear in supporting documentation, and that the names of COMMENT Adobe Systems and Digital Equipment Corporation not be used in COMMENT advertising or publicity pertaining to distribution of the software COMMENT without specific, written prior permission. Adobe Systems and COMMENT Digital Equipment Corporation make no representations about the COMMENT suitability of this software for any purpose. It is provided "as COMMENT is" without express or implied warranty. > -----Original Message----- > From: MIME :nop@nop.com > Sent: Monday, January 31, 2000 10:45 AM > To: squeak(a)cs.uiuc.edu > Cc: squeak(a)cs.uiuc.edu > Subject: Re: Computer Modern Fonts/Mach 2 > > > "Andrew C. Greenberg" <werdna(a)gate.net> wrote at Monday, > January 31, 2000 > 9:29 AM: > > > > At 8:48 AM -0500 1/31/2000, Jay Carlson wrote: > > > >What's the conversion path for these---how did they get > from Metafont > source > > >files to StrikeFont bitmaps? I've done some Metafont > hacking (a zillion > > >years ago), and I'd like to try doing some fixups at the > source level. > For > > >instance, there are left-arrow and up-arrow glyphs in the > symbol sets, > and > > >the prime glyph might be ok as a single quote. > > > > I tried to do this direct from Metafont, but while Metafont makes > > very decent printer fonts, it generates seriously groty 72 dpi fonts > > that unsuitable for serious use, and too weak for a pixel-by-pixel > > fixup. > > Yeah, that's been my experience too. :-/ > > > Then, I used bitEdit to make glyphs for programming (<, >, > leftarrow, > > |, curly braces) or corresponding size, and wrote some scripts to > > install them into the fonts in TextConstants. I then wrote another > > script to adjust the FontSets, and here we are. > > I suppose that could be automated by stealing characters from > the symbol > fonts, but that may be a lot of work to get right, visually. > > > >Would anyone like the fonts from X11 as FontSets? I > figured it'd be > better > > >to publish the tools I used for conversion rather than > pure bitmaps, but > > >even as three doIts in a class comment it's less convenient than a > unified > > >changeset. > > > > Why choose? Do it both ways. > > Good point. I'll get some together tonight. > > > One thing though: are the X11 fonts subject to GPL (which, > > regrettably is incompatible with Squeak)? My primary motivation for > > converting these fonts was to make it possible to remove the font > > limitations from the Squeak license of the general > distribution. I'd > > hate to see us move from one license problem directly to another. > > X11 is not covered by the GPL; it's covered by the MIT/DEC > X11 license. The > BDF sources are text files with comments in them giving > license information > as well; the licenses are not word-for-word identical but are > very similar. > Open one up in a text editor and have a look! > http://wuarchive.wustl.edu/packages/X11R6.3/xc/fonts/bdf/75dpi /helvR12.bdf Jay

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Re: Change the Squeak UI Look
by montgomery farrar tidwell 31 Jan '00

31 Jan '00

Howdy, Torsten.Bergmann(a)phaidros.com wrote: > > ... > - open a file list, select a JPEG or GIF and select 'open image as > background' when i do this, the image is tiled. is there anyway to get it to center and stretch? -- \\//_

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Re: Full Closures - when do they close?
by Jesse Welton 31 Jan '00

31 Jan '00

Robert Withers wrote: > > > Another point. Jesse Welton already pointed out that objects are not copied > > by closures. If two closures refer to same object through their variables, > > changes made using one closure will be visible through another. it is > > important that not only objects are not copied, the bindings are not copied > > as well. Two closures created within the same environment see the same > > bindings, so changes done to a variable of that environment from one closure > > are visible from another. For example: > > > > | cell | > > ^Array > > with: [:arg | cell := arg] > > with: [cell] > > -- ??? Really?? This surprises me. I thought that a closure would > have it's own binding seperate from any other binding. This is > different that two bindings holding the same reference and changing the > internal state of that reference. Aren't you saying that two bindings > pointing to the same reference and one changes the reference, then the > other binding will also have a changed reference? Yes, this is exactly right. This is necessary to allow (among other things) assignments to propagate upwards. Consider: | sum | sum := 0. 1 to: self length do: [ :i | sum := sum + self at: i ]. ^sum In order from something like this to work, "sum" must name the same reference both within and without the block. -Jesse

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