Re: [Newbies] Exemple of pattern
Il giorno mer, 21/06/2006 alle 14.07 +0200, Mathieu SUEN ha scritto: Hi, I was wondering were I can find some concret exemple of Decorator pattern in squeak. In Squeak 3.8, look at the FlashFileStream class. And also:Adapter(I don't really understand the use of it) This I don't know. Abstract Factory I'm not sure, but for abstract factory maybe you could look into ToolBuilder for Squeak 3.9. Builder The GoF book cites Parser, ClassBuilder as examples of the Builder pattern. and Factory methode The GoF book cites BehaviorparserClass as an example of this pattern. Giovanni ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Re: [Newbies] Exemple of pattern
In fact it would be really nice to have a list of the pattern usage. Stef Il giorno mer, 21/06/2006 alle 14.07 +0200, Mathieu SUEN ha scritto: Hi, I was wondering were I can find some concret exemple of Decorator pattern in squeak. In Squeak 3.8, look at the FlashFileStream class. And also:Adapter(I don't really understand the use of it) This I don't know. Abstract Factory I'm not sure, but for abstract factory maybe you could look into ToolBuilder for Squeak 3.9. Builder The GoF book cites Parser, ClassBuilder as examples of the Builder pattern. and Factory methode The GoF book cites BehaviorparserClass as an example of this pattern. Giovanni ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Re: [Newbies] Exemple of pattern
Yes, :-) Do Roel Wuyts can do something for us? ;-) 2006/6/22, stéphane ducasse [EMAIL PROTECTED]: In fact it would be really nice to have a list of the pattern usage. Stef Il giorno mer, 21/06/2006 alle 14.07 +0200, Mathieu SUEN ha scritto: Hi, I was wondering were I can find some concret exemple of Decorator pattern in squeak. In Squeak 3.8, look at the FlashFileStream class. And also:Adapter(I don't really understand the use of it) This I don't know. Abstract Factory I'm not sure, but for abstract factory maybe you could look into ToolBuilder for Squeak 3.9. Builder The GoF book cites Parser, ClassBuilder as examples of the Builder pattern. and Factory methode The GoF book cites BehaviorparserClass as an example of this pattern. Giovanni ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Re: [Newbies] Exemple of pattern
I can sing and dance :-) Given more time I could even try to detect you all kinds of pattern instances, but for that we'd need to port Soul to Squeak again. For the Adaptor thing, any wrapper class will do. There have to exist such classes in Squeak. Doing a search for classes that ends in Wrapper will probably yield some examples. On 22 Jun 2006, at 10:36, Mathieu SUEN wrote: Yes, :-) Do Roel Wuyts can do something for us? ;-) 2006/6/22, stéphane ducasse [EMAIL PROTECTED]: In fact it would be really nice to have a list of the pattern usage. Stef Il giorno mer, 21/06/2006 alle 14.07 +0200, Mathieu SUEN ha scritto: Hi, I was wondering were I can find some concret exemple of Decorator pattern in squeak. In Squeak 3.8, look at the FlashFileStream class. And also:Adapter(I don't really understand the use of it) This I don't know. Abstract Factory I'm not sure, but for abstract factory maybe you could look into ToolBuilder for Squeak 3.9. Builder The GoF book cites Parser, ClassBuilder as examples of the Builder pattern. and Factory methode The GoF book cites BehaviorparserClass as an example of this pattern. Giovanni ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Re: [Newbies] Exemple of pattern
2006/6/22, Roel Wuyts [EMAIL PROTECTED]: I can sing and dance :-) Given more time Of course! No problem. For the Adaptor thing, any wrapper class will do. There have to exist such classes in Squeak. Doing a search for classes that ends in Wrapper will probably yield some examples. Ok I will searche for it. .. But the Decorator pattern use also this convention. Don't he? ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Re: [Newbies] Exemple of pattern
Yes, I mean, I didn't want to say that every wrapper class is an Adaptor. Just that in my experience, if you want to find examples of adaptors, looking through wrapper classes might yield you some examples. And indeed, up until a certain point adaptors and decorators might look similar. Adaptors typically (but not necessarily!) translate interfaces (e.g. they implement methods that a client class expects). Or it might happen that they adapt semantics (in which case they will implement methods with the same signature but adapt the behaviour to be consistent with what a client expects). Decorators typically override methods. Therefore the client cannot make the difference between a non-decorated and a decorated object, and just sends a polymorphic method. Note that these are just very brief summaries of the much more extensive discussions found in the design pattern book... On 22 Jun 2006, at 14:40, Mathieu SUEN wrote: 2006/6/22, Roel Wuyts [EMAIL PROTECTED]: I can sing and dance :-) Given more time Of course! No problem. For the Adaptor thing, any wrapper class will do. There have to exist such classes in Squeak. Doing a search for classes that ends in Wrapper will probably yield some examples. Ok I will searche for it. .. But the Decorator pattern use also this convention. Don't he? ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
[Newbies] installation question
Hi,I've just installed Squeak3.8-MacOS-Full and I noticed that SqueakV3.sources has a date modified of Feb 5, 2040, 9:28 PM I know Squeak is ahead of its time and I'm really impressed, but don't know what it means. Should I worry? -- Tom"Ecrasez l'Infame!" -- Voltaire ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
[Newbies] EmphasizedMenu question
Greetings,I'm working through http://www.maartensz.org/computing/squeak/Helps/Environment/Workspaces4.htm and
(EmphasizedMenu
selections: #('bold' 'plain' 'italic' 'struckout' 'plain' 'nice menu!')
emphases: #(bold plain italic struckOut plain bold))
startUpGives me the MessageNotUnderstood error:doesNotUnderstand: aMessage Handle the fact that there was an attempt to send the given message to the receiver but the receiver does not understand this message (typically sent from the machine when a message is sent to the receiver and no method is defined for that selector).
Testing: (3 activeProcess) (Preferences autoAccessors and: [self tryToDefineVariableAccess: aMessage]) ifTrue: [^ aMessage sentTo: self]. MessageNotUnderstood new message: aMessage;
receiver: self; signal. ^ aMessage sentTo: self.Can someone explain what I've done wrong? (currContext := only)-- Tom"Ecrasez l'Infame!" -- Voltaire
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[Newbies] Demystifying most Smalltalk’s don 't directly support multiple inheritance
List, haven't you heard that Smalltalk and Squeak do not directly support multiple inheritance, time and again? But that Perl, Python and Ruby do (to some extent)? - http://www.google.com/search?q=python+ruby+multiple+inheritance Well, that is not the case for Smalltalk since the time that VMs are implemented by using the specs of the Blue Book. I have attached a small .st file which demonstrates that the *unchanged* VM *must* support multiple inheritance (for message sends), or else it won't work properly. It's a matter of view on what the VM does for you :-D With the exception of support code for exceptions [pun intended] the attached examples work on VMs which implement the super send from the Blue Book. The first example demonstrates that multiple inheritance works; in this example it is also checked that the requesting method qualifies (that the instances qualify is checked at fileIn time). The second example does a message tally and shows that there is less than 50% overhead when possible walkbacks are guarded at every multiple inheritance message send. The third example employs the existing method cache of the VM (the original Squeak VM) for multiple inheritance message sends and thus minimizes the overhead to less than 5% (and the demo is written in .st code :-) Again, this all exists *unchanged* for decades. It only had to be brought to the surface? --- I would be very interested to see if my examples run on other platforms and VMs, please post your experience. Thank you. It'd be equally interesting if the approach had been used before. /Klaus Multiple-Inheritance.st Description: Binary data ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
[Newbies] how to create an object (of a selection of classes)
Best List, Im very curious to the the 'smalltalk way' to write the following code: | shape morph | (2 atRandom == 1) ifTrue: [shape := RectangleMorph] ifFalse: [shape := EllipseMorph]. morph := shape new. I've tried something like: (#(EllipseMorph RectangleMorph) at: (2 atRandom)) new. But thats too silly ? Is there some connection to get a class from a symbol ? Or is that the wrong direction ? Thanks in advance, - Jeroen - aspiring squeaker. ___ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Re: [Newbies] how to create an object (of a selection of classes)
On Jun 22, 2006, at 7:07 PM, Jeroen van Hilst wrote:
I've tried something like:
(#(EllipseMorph RectangleMorph) at: (2 atRandom)) new.
But thats too silly ? Is there some connection to get a class from
a symbol
? Or is that the wrong direction ?
I like your approach. I think using the #() array here will give you
Symbols - but you can use a literal array with curly braces -
{EllipseMorph. RectangleMorph}
to get the actual classes. (Note the period between the array
elements.) This form of literal evaluates its expressions and uses
the results to build the array. it's also useful when you want to
build an array out of some variables, or have some short math or
something to do.
Just to mention it, you can also get to a class from a Symbol by
doing something like
Smalltalk at: #EllipseMorph
if that's needed in your situation.
I don't know if you saw, but collections also respond to #atRandom
directly, so you could do
{EllipseMorph. RectangleMorph} atRandom new.
Hope this helps,
Benjamin Schroeder
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