New class factory for tests (and other use cases)

> Stéphane Ducasse <stephane.ducasse@...> writes:
>
>> class := ClassFactory newSubclass: Point with: [ :f |
>>       f metaSide compile: 'somePoint ^ self x: 2 y: 3'.
>>       f compile: '+ arg ^ self x + arg x ..... 3' ].
>> ].
>
> Looks nicer, gekauft :)
>
> --AA
>
>
>
>
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> `ClassFactoryForTestCase` is a awesome tool when you need to create  
> throw-away
> classes for tests. And the new akuhn/SUnit includes a DSL that makes  
> creating
> anonymous classes even simpler!
>
> The new DSL is put in a new class to avoid compatibility issues. To  
> create an
> anonymous class just do
>
>    class := ClassFactory newClass.
>
> this creates a new subclass of Object. The creates classes is  
> automatically
> reclaimed by garbage collection when no longer used. That is, tear  
> down of
> class factory is not required anymore.
>
> The class is created without logging and not registered with the  
> system. That
> is, `Object subclasses` does not include the created class.
>
> To create a subclass of a specific class do
>
>    class := ClassFactory newSubclass: Point.
>
> To create a subclass with accessors do
>
>    class := ClassFactory newSubclass: Point with: [ :f |
>        f compileAccessorsFor: 'color' ].
>
> If you want getters or setters only, use `#compileSetterFor:` or
> `#compilerGetterFor:`. If you want an instance variable without  
> accessor, use
> `#declareInstVar:`.
>
> To create a subclass with methods do
>
>    class := ClassFactory newSubclass: Point with: [ :f |
>        f compile: 'answer ^ 42' ].
>
> NB: please note that class factory compiles silently without logging.
>
> To create a method on the class side do
>
>    class := ClassFactory newSubclass: Point with: [ :f |
>        f forClass: [ :cf |
>            cf compile: 'somePoint ^ self x: 2 y: 3' ]].
>
> In fact, the class side factory `cf` supports the same protocol as  
> the instance
> side factory. Please note that creating instance variables on the  
> class side
> creates "class instances variables" and not "instance class  
> variables". That
> is, they are local to the creates class but not to subclasses of the  
> created
> class. Typically this should not be a limitation since you only  
> create one
> class without further subclasses.
>
> Also, please note that the created classes and all instances created  
> from that
> class are ment to be thrown away after their use. The created class  
> is not
> registered with the system, and thus when you change the instance  
> size of its
> superclass the created instances will not be updated.
>
> Gofer it
>    disablePackageCache;
>    squeaksource: 'akuhn';
>    package: 'SUnit';
>    package: 'SUnitGUI';
>    load
>
> --AA
>
>
>
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> Alexandre Bergel <alexandre@...> writes:
>
>> I feel yes. In the code you gave, there are 4 hard-to-remember
>> keywords (ClassFactory, newSubclass:, with:, metaSide), without
>> counting the block declaration.
>> Variable declaration is possible using a method
>> #createClassNamed:superclass:ivs:
>
> It's a new API, so you have to learn it, yes.
>
> It's regular and rather small though. You start with
>
>    #newClass
>    #newClassWith: aBlock
>    #newSubclass: aClass
>    #newSubclass: aClass with: aBlock
>
> and continue within the block with
>
>    #classSide ...
>    #declareInstVar: name
>    #compileGetterFor: name
>    #compileSetterFor: name
>    #compileAccessorsFor: name
>    #compile: sourceString
>
> of which you typically need the last two only.
>
> C'est tout :)
>
> --AA
>
>
>
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