[Newcompiler] [ANN] First version of Shout using new SqueakParser/SqueakScanner

[Stéphane Ducasse]

On 27 août 06, at 11:47, Andrew Tween wrote:

> Hi everyone,
> I have put together an experimental version of Shout which uses  
> subclasses of
> SqueakParser/SqueakScanner. You can get it from here...
>
> http://www.squeaksource.com/shout/ShoutUsingNewCompiler.3.15-tween. 
> 71.mcz
>
> It have developed/tested it in the NewCompiler.image.
>
> Currently, the subclasses have their own SmaCC definitions, but it  
> would be good
> to merge the changed definiiton into the main parser/scanner. Who  
> is the best
> person to talk to about that?

marcus/philippe?
>
> When I tried making changes to the SqueakParser and regenerating  
> it, I got a lot
> of errors from which I couldn't recover. It's obvious why -  I was  
> compiling the
> SqueakParser with a compiler which uses the SqueakParser. Half way  
> through
> compilation the SqueakParser is in an invalid state).

:)

>     I got around this by using the old compiler to compile  
> SqueakParser/
> scanner, but it raises the question - "if an image only contained  
> the new
> compiler, then how could the parser be maintained?". How would this  
> be handled -
> include the old compiler, modify the Smacc generator to compile to  
> a temporary
> class and then rename it, have 2 Smacc parsers and alternate  
> between them, ...?
> Of course, by subclassing SqueakParser/scanner I circumvented the  
> problem
> altogether.

This is a really fun question.

>
> Cheers,
> Andy
>