Squeak-dev September 1998

squeak-dev@lists.squeakfoundation.org

108 participants
197 discussions

Re: Crashing Squeak
by William O. Dargel 22 Sep '98

22 Sep '98

Dan Ingalls wrote: > The allusion to PseudoContext makes me immediately wonder if you have been > using a Jitter interpreter. We have had a couple of problems with become: > in Jitter, and we have probably not nailed them all because we have not > been using Jitter a lot recently. The reason for this is that Ian has a > new and diffeerent design for Jitter II, and we are awaiting that before > resuming serious focus on the Jitter VM. One of the historical occasions might have been on Jitter, but in general no. Today it has all been with the standard Windows VM. Actually, I just tried it using the Jitter and it didn't crash. But I'm not sure that says too much, since practically any deviation from the sequence and it won't crash (at least not immediately). > If this happens in a non-Jitter VM, and if you can put the image and > changes where I can get at them, I will see what I can discover about your > problem. You can save me one step if you have access to a Mac by seeing > if you get the same result on a Mac. Sorry, but I don't have access to a Mac. I also don't have anyplace that I could put the image and changes for retrieval. (Note to self: I really ought to rectify that). I could email them to you, if a 2.5MB zip file as an attachment would be OK. > Absolutely. We have observed no such flakiness with non-Jitter Mac VMs. > I won't say you can't crash Squeak, but five people in our group pound on > Squeak, day in and day out, in images that have run rock solid for weeks > and months on end. That's good to hear. One of the things about Squeak that really attracts me (having worked too long with the unsupported V/286) is the support that Squeak has. Both from the community and from having all of the source available. We've lived with periodic General Protection Faults from V/286 because there didn't seem to be anything that we could do about it. But here, I can do something about a similar problem. And I will (right after I get a C development environment from this decade :-) But I'm also glad that there are experts out there that are willing to take a crack at the problem. -Bill. ------------------------------------------- Bill Dargel wdargel(a)shoshana.com Shoshana Technologies 100 West Joy Road, Ann Arbor, MI 48105 USA

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Re: nil or #nil?
by Tim Olson 21 Sep '98

21 Sep '98

>Did this ever get resolved? I don't think there was a final resolution on it, but this question raises the larger question of Pink plane vs. Blue plane. Dan Ingalls wrote about this "pull" between the Pink and Blue planes in October of '97; here are some exerpts: ---- There are two strong forces at work in the Squeak team, which are often in opposition. However we have managed to keep it together for long enough that it's probably adequate to articulate the two and you can guess at where equilibrium will take us. These have most recently been articulated in Alan's allusion to Toffler's metaphor of progress in the pink (incremental improvement) plane and the blue (paradigm shift) plane. The forces in the pink plane have to do with making an ever-better Smalltalk-80 system that can serve a wide spectrum of research and academic needs, while leveraging off the large body of ST-80 documentation, existing code archives, and synergy with high-performance industrial ST-80 systems. In this plane Squeak's high level of compatibility with the ST-80 language (and even with the MVC display architecture) is a plus, and the current forces of progress are aimed at a higher performance interpreter, with support for block closures, exception handling, as well as some answer to various needs for finalization. There is an active crew, led by Iam Piumarta, working on the first two items, and we are holding a couple of solutions to the latter issues in abeyance until the new interpreter is incorporated and running stably. The forces in the blue plane have to do with a completely different graphics model, evolution of the language model, and hopefully an even simpler yet more powerful language kernel. Each of these constitutes significant change, and is thus at odds with various entrenched interests. At the same time we feel that each offers significant benefits. A fair portion of the new graphics model, based on the Morphic interface to Self is already running and can be explored in the Play WIth Me windows of the release. While some parts of Morphic have not been honed to peak performance like other parts of the system, many are much simpler and yet more general. With the next release you will see presentation graphics support such as drop shadows and gradient fills, as well as desktop publishing capabilities including linked text frames, text flow inside and around arbitrary shapes, and letter kerning. To best understand the "blue" pulls within the Squeak group, you need to understand what we're after. Our number one commitment is to an exquisite personal comuputing environment. Imagine a system as immediate and tactile as a sketch pad, in which you can effortlessly mingle writing, drawing, painting, and all of the structured leverage of computer science. Moverover imagine that every aspect of that system is described in itself and equally amenable to examination and composition. Perhaps this system also extends out over the internet, including and leveraging off the work of others. You get the idea -- it's the Holy Grail of computer science. All and everything. So if some new approach comes along that takes us closer to that ideal, but at the cost of a break with ST-80 tradition, we will probably take the new approach. ---- So the stated goals of Squeak (from "Squeak Central's" viewpoint, at least) do not include 100% compatibility with other Smalltalks; in the future there will likely be larger divergences between Squeak and the ANSI Smalltalk standard. To summarize from the "Pink Plane" and "Blue Plane" perspectives: The "Pink Plane" fix would be to adopt the ANSI standard in this case, and have the reserved identifiers 'nil', 'true', and 'false' treated specially in literal array creation. Some of the proposed "Blue Plane" fixes are: 1) explicit general evaluation literal arrays are created as they are now, but a special escape operator (##)? allows the insertion of any general expression, which is evaluated at runtime: foo := 25. x := #(foo ##foo 1 $b nil ##nil) x -> (#foo 25 1 $b #nil nil) 2) general evaluation with explicit non-evaluation literal arrays are created from a sequence of explicit literals; any non-literal is evaluated (runtime or compile time context?) foo := 25. x := #(#foo foo 1 $b #nil nil) x -> (#foo 25 1 $b #nil nil) note that #2 is the same as the existing Brace construct in Squeak, with a slightly different syntax. -- tim

2 1

FTP url format??
by O'NEEL Bruce 21 Sep '98

21 Sep '98

Hi, I think the answer to your question can be found in either RFC 1738 or RFC 1630. I got them from http://www.pmg.lcs.mit.edu/cgi-bin/rfc/view?1738 and http://www.pmg.lcs.mit.edu/cgi-bin/rfc/view?1630 I think the relevent bits of 1738 are: ********************************************************************** 3.2.2. FTP url-path The url-path of a FTP URL has the following syntax: <cwd1>/<cwd2>/.../<cwdN>/<name>;type=<typecode> Where <cwd1> through <cwdN> and <name> are (possibly encoded) strings and <typecode> is one of the characters "a", "i", or "d". The part ";type=<typecode>" may be omitted. The <cwdx> and <name> parts may be empty. The whole url-path may be omitted, including the "/" delimiting it from the prefix containing user, password, host, and port. The url-path is interpreted as a series of FTP commands as follows: Each of the <cwd> elements is to be supplied, sequentially, as the argument to a CWD (change working directory) command. If the typecode is "d", perform a NLST (name list) command with <name> as the argument, and interpret the results as a file directory listing. Otherwise, perform a TYPE command with <typecode> as the argument, and then access the file whose name is <name> (for example, using the RETR command.) Within a name or CWD component, the characters "/" and ";" are reserved and must be encoded. The components are decoded prior to their use in the FTP protocol. In particular, if the appropriate FTP sequence to access a particular file requires supplying a string containing a "/" as an argument to a CWD or RETR command, it is necessary to encode each "/". For example, the URL <URL:ftp://myname@host.dom/%2Fetc/motd> is interpreted by FTP-ing to "host.dom", logging in as "myname" (prompting for a password if it is asked for), and then executing "CWD /etc" and then "RETR motd". This has a different meaning from <URL:ftp://myname@host.dom/etc/motd> which would "CWD etc" and then "RETR motd"; the initial "CWD" might be executed relative to the default directory for "myname". On the other hand, <URL:ftp://myname@host.dom//etc/motd>, would "CWD " with a null argument, then "CWD etc", and then "RETR motd". FTP URLs may also be used for other operations; for example, it is possible to update a file on a remote file server, or infer information about it from the directory listings. The mechanism for doing so is not spelled out here. ********************************************************************** Reading this points out that one of my implimentations of a FTP url is slightly wrong... cheers bruce Ted K. writes: > Folks, > I'd like to know the answer to this question. In Fetch or FTP you can send commands separately to get ready to read files: > > host: shell.webpage.com > user ID: kaehler2 > password: xxxxx > directory: public_html/updates > > But, suppose you want to encode this in a url (for use in Netscape): > > ftp://kaehler2@shell.webpage.com/public_html/updates > > The problem is whether "public_html/updates" is absolute or not. It happens to be relative to the directory for kaehler2. > > But suppose I want to get a file from a directory and I know the complete path. How to do I encode this in a url? > > ftp://kaehler2@shell.webpage.com/drive1/usr/kaehler2/public_html/updates > > Is there an existing convention for this? What goes between the '.com' and the 'drive1' to indicate an absolute path? The above gives an error, since the directory kaehler2 does not have a subdirectory called drive1. > > What do other systems do to indicate an absolute ftp url? > > --Ted. > > > Ted Kaehler, Walt Disney Imagineering, R&D > (home) 3415 Cork Oak Way, Palo Alto, CA 94303. voice (650) 424-1070 > http://www.webPage.com/~kaehler2/ > Give me your old Macintosh! I will put it in a first grade classroom. > >

1 0

CrLfFileStream>>next: bug
by Pennell 21 Sep '98

21 Sep '98

If you create a new file in the file browser and then click on it, CrLfFileStream>>next: dies because it doesn't deal with n==0. The superclass returns a String with size 0. This is broken in both 2.1 and 2.2Beta. I can't believe I waited so long to try this. If you don't use a Mac, then filing in code pulled down with you browser or received via e-mail. Dan - thanks for adding this in 2.2. Is there any reason not to make this the default? If you don't change the default for 2.2, can you add it as a preference? - david ---------------------- 'From Squeak 2.1 of June 30, 1998 on 21 September 1998 at 8:54:47 am'! !CrLfFileStream methodsFor: 'access' stamp: 'djp 9/21/1998 08:48'! next: n | string | string _ super next: n. string size == 0 ifTrue: [^string]. lineEndConvention ifNil: [^ string]. lineEndConvention == #crlf ifTrue: ["Special case for last character" (string last = Cr and: [self peek = Lf]) ifTrue: [self next]]. ^ self convertStringToCr: string! !

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Re: nil or #nil?
by Pennell 21 Sep '98

21 Sep '98

Did this ever get resolved? Michael's original example was simplified from T-Gen's actual usage. A real-life example is a little more complicated. ---------------------------------------------------------- initialize "TokenSpecScanner initialize" " <tokenClass> : \<[a-zA-Z_][a-zA-Z_0-9]*\> ; <directive> : \{[a-zA-Z_][a-zA-Z_0-9]*\} ; <dchar> : \\[0-9][0-9][0-9] ; <ochar> : \\o[0-7][0-7][0-7] ; <hchar> : \\x[0-9A-F][0-9A-F] ; <eschar> : \\[!-\~] ; <char> : [!-\~] ; <comment> : \""(~[\""]|\""\""|[\s\t\r])*\"" {ignoreComment} ; <space> : [\s\t\r]+ {ignoreDelimiter} ; " | table | self fsa: #( #( nil nil nil nil nil nil nil nil 2 nil nil nil 2 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 2 3 4 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 7 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 10 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 22 3 3 3 nil ) #( nil nil nil nil nil nil nil nil 2 nil nil nil 2 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 2 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil 5 nil nil nil 5 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 5 5 6 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 nil ) #( nil nil nil nil nil nil nil nil 5 nil nil nil 5 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 5 5 6 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 5 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 nil nil nil nil 8 nil 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 8 8 8 8 8 8 8 8 8 8 nil nil nil nil 9 nil nil 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 nil nil nil nil 8 nil 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 12 12 12 12 12 12 12 12 12 12 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 15 11 11 11 11 11 11 11 11 19 11 11 11 11 11 11 nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 13 13 13 13 13 13 13 13 13 13 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 14 14 14 14 14 14 14 14 14 14 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 16 16 16 16 16 16 16 16 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 17 17 17 17 17 17 17 17 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 18 18 18 18 18 18 18 18 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 20 20 20 20 20 20 20 20 20 20 nil nil nil nil nil nil nil 20 20 20 20 20 20 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 21 21 21 21 21 21 21 21 21 21 nil nil nil nil nil nil nil 21 21 21 21 21 21 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) ( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 nil nil nil nil 23 nil 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 nil nil nil nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 23 23 23 23 23 23 23 23 23 23 nil nil nil nil nil nil nil 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 nil nil nil nil 23 nil 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 23 nil nil 24 nil nil ) #( nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil ) ). table := #( nil #( #( ) #( #('<space>' #ignoreDelimiter) ) ) #( #( '+' ';' '*' '~' ')' '(' '[' '|' ':' ']' '?' '-' ) #( #('<char>' nil) ) ) #( #( ) ( #('<char>' nil) ) ) nil #( #( ) #( #('<comment>' #ignoreComment) ) ) #( ) #( #('<char>' nil) ) ) nil #( #( ) #( #('<tokenClass>' nil) ) ) #( ) #( #('<char>' nil) ) ) #( #( ) #( #('<eschar>' nil) ) ) #( #( ) ( #('<eschar>' nil) ) ) nil #( #( ) #( #('<dchar>' nil) ) ) #( #( ) ( #('<eschar>' nil) ) ) nil nil #( #( ) #( #('<ochar>' nil) ) ) #( #( ) ( #('<eschar>' nil) ) ) nil #( #( ) #( #('<hchar>' nil) ) ) #( #( ) ( #('<char>' nil) ) ) nil #( #( ) #( #('<directive>' nil) ) ) ). self constructFinalStateTable: table ------------------------- The options that have been proposed: >From Pat Caudill: Well I am looking at an older copy of the document, not the approved one, but the ANSI standard states "If an identifier appears as an <array element> and it is one of the reserved identifiers nil, true, false the value of the coresponding element of the collection is the value of that identifier." If you want the symbol nil you say Table _ #( (-1 -1 ) 2 3 #nil). >From David N. Smith: For what it's worth, IBM Smalltalk 4.5 does this: #( nil #nil true #true false #false self super ) produces: #( nil #nil true #true false #false #self #super ) where nil, true, and false are the special objects. I'd vote for this result, not because IBM Smalltalk does it, but because it makes sense, is much more often the 'right thing', is in the proposed standard, and makes Squeak have one less gotcha. It's these little things that can drive you crazy when switching between systems. >From Dan Ingalls: 1. Table _ #( (-1 -1 ) 2 3) copyWith: nil. ....the no-frills approach. 2. Table _ { {-1. -1}. 2. 3. nil}. ....at least if someone ports it, they'll know it needs to be converted from Squeak. 3. Table _ #( (-1 -1 ) 2 3 ##(nil)). ....I'm NOT proposing ## as the operator that means evaluate (a sort of un-literal mode), but I AM saying that if we must have a way of putting values in a literal expression, then let us a) make it explicit, and b) make it general. [Historical note: ST-76 had just such a construct -- it had a special character (typed as ctrl-openParen) that looked like '->(' and meant "the value of this parenthetical expression" in a literal. Needless to say, that feature was not felt to carry its weight when the ST-80 standard was defined] ----------- The EASY thing to do for porting T-Gen is to use Dan's option 2 with the Squeak-specific curly-braces. However, I thought there was an earlier thread on this subject where at least one Squeak core-team questioned whether the curly braces would be continued. I for one would much prefer the ANSI/IBM/et-al approach. I think David (N. Smith)'s summary says it all. -david

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Re: Some methods not sorted
by Michael S. Klein 21 Sep '98

21 Sep '98

I was thinking about this, and, using the Smalltalk convention of capitalizing the first letter of subwords in compound words (i.e. compundWords), a strict ASCII sort makes more sense. Check Out: case-insensitive: askEarlier asKing askingSomeQuestion askLater askNow asLower asQueen assumeNothing asUpper Case-Sensitive: asKing asLower asQueen asUpper askEarlier askLater askNow askingSomeQuestion assumeNothing As a completely off-topic gripe... case-insensitivity of symbols is my least favorite part of Scheme... I mention only because of Smalltalk's Lisp heritage. Also, I wonder how people capitalize compundWords with one letter. It works okay if the one word letter is at the beginning, i.e. aHorse but if not, then what? findAhorse or findAHorse Usually I cheat and say findSomeHorse Also, although abreviations are discouraged in Smalltalk (with the notable exception of ST-80... no wonder newbies spell it SmallTalk ;-) they are rampant elsewhere, and I really dont want to have to write: asHyperTextMarkupLanguage (especially since 'hypertext' is one word) so do I write (A) getHTMLDocument (B) getHtmlDocument (C) getHTMLdocument I prefer (B), thinking of it as raising the abreviation to word status. Of course, this decision will interact with the one-letter-words, as well. If I haven't lost everybody on completely trivial matters, ever notice that the implementation of Object >># printOn: doesn't work for classes like HTMLDocument and UnixProcess :-? Enough for now... back to counting those angels... -- MIke

2 1

squeak FAQ?
by Aibek Musaev 20 Sep '98

20 Sep '98

Where can I find squeak FAQ if there is one?

2 1

Re: Confusion over basic Array new:
by David Stes 19 Sep '98

19 Sep '98

On Thu, 17 Sep 1998, Michael S. Klein wrote: > Hmm... I wonder what > > Behavior new superclass > > should be? I vote for nil, with Object being a close second. It's returning nil, but I find this is a bit strange, perhaps because of how I'm used to have things working in Objective-C (where only Object has nil as superclass). Objective-C uses some sort of simplified form of what Squeak offers : there is no separate metaclass hierarchy. The root class, Object, is the root for both instances and classes. Object instance <------------ Object class ^ ^ Collection instance Collection class ^ ^ OrderedCollection instance OrderedCollection class Where the arrow denotes in the left column how instance method lookup proceeds, and in the right column how class (factory) message lookup proceeds (ending the search for factory methods with Object's instance methods). There is an instance method class (which returns the class) and a factory method class (which returns self!). Like this, the 'class' message never returns metaclasses (although they do exist in the VM). It's possible that this simplified model was derived from some older Smalltalk implementation (I don't know). Or maybe when O-C was designed, they were thinking that Smalltalk's metaclass model was too complicated.

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Re: Confusion over basic Array new:
by Tim Olson 19 Sep '98

19 Sep '98

>Tim Olson: >> It might work for most cases, but what about, for example, Metaclass? >> Metaclass overrides new from Behavior to prevent multiple metaclasses >> from being created. If the new and new: messages were intercepted more >> "downstream" by Object class, then Metaclasses couldn't do special things >> like this... > >Tim, Object class is not on the inheritence chain for instances of Metaclass. >See code snippet (A) below... This means that the behavior of >instances of Metaclass (metaclasses) will be unaffected by modifications >of Object's class-side methods. Uh, right you are -- thanks for the catch! -- tim

1 0

2.2 Tiny fix for text links in Morphic
by David Mitchell 18 Sep '98

18 Sep '98

When I click on text links in Morphic, I get a walkback: Message not understood: linkMethod:. Since link method is on Model and TextMorphEditor is a subclass of Controller, I added a method on Controller to send the message to its model. 'From Squeak 2.2beta of Sept 16, 1998 on 18 September 1998 at 11:58:08 am'! !Controller methodsFor: 'text links' stamp: 'mitchell(a)sky.net 9/18/1998 11:54'! linkMethod: classAndMethod ^self model linkMethod: classAndMethod! ! -----== Sent via Deja News, The Discussion Network ==----- http://www.dejanews.com/ Easy access to 50,000+ discussion forums

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