Lex Spoon wrote:
> 
> On Tue, Jun 04, 2002 at 04:20:05PM +0100, Mike Rutenberg wrote:
> > Why did this happen?
> >
> > The original problem seems to be that at some point and in only some
> > images the class ResourceCollector disappeared.
> >
> > The change set
> >       4859resFix-mir -- Michael Rueger -- 3 May 2002
> > refers to ResourceCollector and so breaks when you try to add two
> > methods to the non existing class.
> 
> Squeak is robust in cases like this for instance variables.  If you use
> a variable at the beginning of a changeset, and then define it later,
> then Squeak will temporarily allocate a global variable in Undeclared.
> Whenever a variable is defined for real, the methods using it will be
> recompiled and the undeclared entry will go away.
> 
> Methods and class definitions could also be made robust.  For both
> cases, we could define an empty class which is a subclass of object,
> and add the method or subclass to that empty class.  *But*, we can't
> easily do so with the current fileout format, because the classes are
> referenced directly instead of by name.  How about we start a move
> towards using the ANSI SIF format ?  That format should easily allow
> tricks like this.
> 
> Alternatively, don't do file-in's by executing the commands.  Just run
> the parser, and then analyze what it looks like....
> 
> Or, most simply of all, change the fileout format to use symbols for
> class names, like this:
> 
>         (Smalltalk robustClassNamed: #ResourceBuilder) methodsFor:
>         'blahblah'!
> 
> No, I'm not volunteering to do it myself, just wishing....  :)
> 
> Now in theory, experienced programmers don't make mistakes like trying
> to add a method to a class that doesn't exist.  But clearly, even
> experienced programmers bump into this kind of thing every once in a
> while.  Imagine what novices, such as people taking a class based on
> Squeak, will run into.  Simply halting the filein makes it harder to
> recover.
> 
> _-Lex
Your wish is my order !
Attached is a change set that does exactly this.
I hope for some feedback on these subjects:
#1 how to supply sUnit test for this cs in order to
#1.1 make it go in the update stream
#2 wheater to add the compatibility chunk in more hooks
#3 if this is ever going to work with modules?

HTH
Torge
>From Preamble:
"Change Set:		RobustFileIn-th
Date:			11 June 2002
Author:			Torge Husfeldt

Makes fileIns more robust in that it replaces direct class references
with calls to Smalltalk. Unfortunately this changes the fileOut format
so a little hack is included to make new changeSets still fileInto old
images."
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