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Scoping Question (Beginner) [message #932066]

Wed, 03 October 2012 16:06

Andreas Studer
Messages: 2
Registered: July 2009

Junior Member

Hello all

Given the following language definition (simplified to cover the problem ;-):

Model:
	mainclasses+=MainClazz*
	takes+=Take*
;
	
Clazz:
	MainClazz|SubClazz;

MainClazz:
	'main' name=ID
	'subclasses' subclazz+=SubClazz* '.'
;

SubClazz:
	name=ID
;

Take:
	'take' name=ID
	'Class' clazz=[Clazz]
;

So in this constellation, I only have access with the generated DSL to the instances of "MainClazz" in Take.clazz. However, if I have a look at the generated ecore model, it seems to me as I would have the possibility of referencing all instances of SubClazz and MainClazz with the superclass Clazz in the attribute Take.clazz (as I would expect).

index.php/fa/11712/0/

Is there a way to get all instances of Clazz availabe for Take.clazz? Is this in context with the scoping feature of xtext? Or should I do it completely different?

Thanks for any help or clarification.

Andreas

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Re: Scoping Question (Beginner) [message #932075 is a reply to message #932066]

Wed, 03 October 2012 16:15

Christian Dietrich
Messages: 4387
Registered: July 2009

Senior Member

Hi,

clazz=[Clazz|FQN]

FQN: ID ("." ID)*;

should do the trick

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Re: Scoping Question (Beginner) [message #934232 is a reply to message #932075]

Fri, 05 October 2012 15:33

Andreas Studer
Messages: 2
Registered: July 2009

Junior Member

Hello Christian

Thanks. That was really the trick.

However, I don't understand exactly why this works, but it does...
(it seems to me like a "...and here some magic happens" solution Wink

)

Andreas

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Re: Scoping Question (Beginner) [message #934236 is a reply to message #934232]

Fri, 05 October 2012 15:36

Christian Dietrich
Messages: 4387
Registered: July 2009

Senior Member

clazz=[Clazz] us short for clazz=[Clazz|ID]
which means "ref to a Clazz and therefore parse an ID"

Names a by default built hierachically
=> parentname.childname

an id does not allow a dot
=> you get only clazzes with a name without dot => parents

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