Squeak-dev September 1999

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133 participants
357 discussions

[BUG]Stream class>on:from:to: & reset
by Tim Rowledge 03 Sep '99

03 Sep '99

If one makes a ReadStream or WriteStream using #on:from:to:, you get to stream on the contents of the collection starting at the from'th element and ending at the to'th element. Unfortunately if you the reset the stream, it will start at the first element, no matter what the from index was supposed to be! The bad news is that fixing this _could_ be a bit tricky, since we would need to add an instvar to each class, and this would mess up any prims relying on instvar numbering; I can't see any right now, but that doesn't mean there aren't any! If we're safe to add and instvar, the fix is pretty trivial. I've looked back as far as a 1982 sources file, and it was like that all the way back. Guess nobody resets partial streams very often :-) tim -- I am still waiting for the advent of the computer science groupie. Tim Rowledge: rowledge(a)interval.com (w) +1 (650) 842-6110 (w) tim(a)sumeru.stanford.edu (h) <http://sumeru.stanford.edu/tim>

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squeak for dos ...
by Mayer Goldberg 02 Sep '99

02 Sep '99

Dear Squeakers ... :) The following link to the Squeak "Port to bare DOS on a PC. (Port by Chris Grindstaff)": http://www.appliedreasoning.com/goodies/squeak/ is invalid. I've tried looking for a dos implementation on the net but all I found were links to the above ... :) So ... Is there a Squeak for DOS? I'm still using my old DOS machine, and would love to put Squeak on it; Everything else about it squeaks ... :) Thanks, Mayer

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RE: [BUG]Stream class>on:from:to: & reset
by Norton, Chris 02 Sep '99

02 Sep '99

Hi Folks. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Andres Valloud [sqrmax(a)cvtci.com.ar] wrote: > > >by the stream scheduler, or... Tar? No... StreamGlue? GluedStreams? > > >StreamCat would do (perhaps), because of conCATenate... I'm open to > > >name suggestions here. > > How about StreamStream? > > Hmmmm... Chris Norton has also provided SequencedStream... so now that's > two candidates. I haven't yet decided. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ While thinking a bit more about Andres' proposal, It occurred to me that such an object, which, for the sake of argument might be called SequencedStream (with OrderedCollection-like behavior, as well as Stream behavior), would own/maintain one or more Stream instances of a given Stream type. If one were interested in streaming over several different kinds of objects, perhaps another object, ComplexSteam (a subclass of SequencedStream), could be used. I'm not sure if the distinction is useful, but there it is. :-) I suppose it might also be useful if SequencedStream maintained separate stream pointers for each of its sub-streams. Thus you could simulate a system bus, etc. Well, I guess I've spent my 2 bits... ;-) ---==> Chris

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anAnyClass scaleBy:<foo>. What should <foo> be?
by John-Reed Maffeo 02 Sep '99

02 Sep '99

I am making modifications to the scaleBy: method in class Path. That method is scaling points but does not use the class Point scaleBy: method and I think that it should. When I look at allImplementors of scaleBy: I am confused as to what the most correct object is which should be included in the selector. Different methods seem to expect (or accept) different objects: aPoint, aFactor, aScale. Since scaleBy: (and transformBy:) exist to support WindowingTransformations, and its checkScale: method says --- begin quote checkScale: aScale "Convert aScale to the internal format of a floating-point Point." | checkedScale | checkedScale _ aScale asPoint. ^checkedScale x asFloat @ checkedScale y asFloat --- end quote it seems to me that scaleBy: aFloatingPointPoint should be the standard. Yes? No? Maybe? Thanks, John-Reed Maffeo Mesa, Arizona

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RE: [BUG]Stream class>on:from:to: & reset
by Jarvis, Robert P. 02 Sep '99

02 Sep '99

Or MultiStream? Bob Jarvis The Timken Company > -----Original Message----- > From: Andres Valloud [SMTP:sqrmax@cvtci.com.ar] > Sent: Thursday, September 02, 1999 3:07 PM > To: squeak(a)cs.uiuc.edu > Subject: Re: [BUG]Stream class>on:from:to: & reset > > Hi. > > > >by the stream scheduler, or... Tar? No... StreamGlue? GluedStreams? > > >StreamCat would do (perhaps), because of conCATenate... I'm open to > > >name suggestions here. > > How about StreamStream? > > Hmmmm... Chris Norton has also provided SequencedStream... so now that's > two candidates. I haven't yet decided. > > Andres. >

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Styled text from file-in?
by shaping＠bigfoot.com 02 Sep '99

02 Sep '99

Hi. Can can someone tell me how to file-in text and apply its style chunk? The method below skips the style chunk: [ReadWriteStream>>] fileInAnnouncing: announcement "This is special for reading expressions from text that has been formatted with exclamation delimitors. The expressions are read and passed to the Compiler. Answer the result of compilation. Put up a progress report with the given announcement as the title." | val chunk | announcement displayProgressAt: Sensor cursorPoint from: 0 to: self size during: [:bar | [self atEnd] whileFalse: [bar value: self position. self skipSeparators. val _ (self peekFor: $!) ifTrue: [(Compiler evaluate: self nextChunk logged: false) scanFrom: self] ifFalse: [chunk _ self nextChunk. self checkForPreamble: chunk. Compiler evaluate: chunk logged: true]. self skipStyleChunk]. self close]. ^ val I suppose I have to convert the style chunk into an appropriate text-attribute run array and apply it to the text before it is compiled. I don't see any examples of how this is done. Any pointers would be appreciated. Regards, Shaping

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[ENH] Image based session management
by Stephen Pair 02 Sep '99

02 Sep '99

>From the discussion yesterday on reversing fileins, I thought it would be nice to have a utility that helps me manage the images that frequently pile up on disk. This is the result: http://www.advantive.com/squeak/SessionManagement.cs -------- From the preamble ------- This is a small change set that adds three items to the World menu: begin session revert to commit to The first item (begin session) allows you begin a new work session by taking a snapshot of the current image and giving it a name that incorporates a time stamp and a session note. The second item (revert to) allows you to select a session to revert back to (reverting take you to the state at the time the selected session was started). ***Intermediate sessions (images) are deleted from disk. At the moment, you must manually restart the image for the session you wish to revert to (as this is a platform dependent thing). The third item (commit to) will commit all current changes to the session (image) selected. ***Intermediate sessions (if any) are deleted from disk, and the selected one is overwritten with the current state of your image I find these tools to be small, but useful in helping to keep track of the various images that I do work in. - Stephen

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RE: Telnet
by Peter Crowther 02 Sep '99

02 Sep '99

> > is it possible to make a telnet connection/session from within Squeak? > I don't have one of those, but I do have code for a telnet *server* within Squeak, including most of a curses library. Thanks go to a certain lurker on this list [hi Adrian] for 90+% of the code for this. It's not fully debugged, which is why there's been no real fanfare. - Peter

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What is correct in include: nil ?
by Javier Diaz 02 Sep '99

02 Sep '99

Before update 1398 threefixes-bf by Bert Freudenberg the following expression return false: '@<>)$"' includes: nil But after the update fails with error 'Message not understood: asciiValue', is this correct?

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RE: What is correct in include: nil ?
by Raab, Andreas 02 Sep '99

02 Sep '99

It should return false since nil is not in the String. [Note to Dan: Seems like all the senders of String class>>indexOfAscii:inString:startingAt: don't check if the argument is a character at all before sending #asciiValue. It should be fixed in these senders] Andreas -- +===== Andreas Raab ========= (andreasr(a)wdi.disney.com) ==+ | Walt Disney Imagineering Phone: +1 818 544 5016 I I Glendale, CA Fax: +1 818 544 4544 I +======< http://isgwww.cs.uni-magdeburg.de/~raab >========+ > ---------- > From: Javier Diaz > Reply To: squeak(a)cs.uiuc.edu > Sent: Wednesday, September 1, 1999 4:29 PM > To: squeak(a)cs.uiuc.edu > Cc: recipient list not shown > Subject: What is correct in include: nil ? > > Before update 1398 threefixes-bf by Bert Freudenberg the following > expression return false: > > '@<>)$"' includes: nil > > But after the update fails with error 'Message not understood: > asciiValue', > is this correct? > >

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