[news.eclipse.modeling.tmf] Re: Cross reference

[Ilyas Keser <ilyas.keser@xxxxxxxxx>]

Hi ouakib,

afaik you can restrict the reference to attributes of the same class by providing your own ScopeProvider (see [1]). Here is some pseudo code, hope it helps:

public IScope scope_Attribute_name(Attribute context, EReference reference){

	// get all elements of the class
	EList<Element> elements = ((Class)context.eContainer).getElt();

	// get attributes
	Collection<Attribute> attributes = EcoreUtil.getObjectsByType(elements, YourDSLPackage.eINSTANCE.getAttribute());

	Iterable<IScopedElement> scopedElements = Scopes.scopedElementsFor(attributes, new Function<EObject, String>() {
		public String apply(EObject from) {
			return (((Attribute)from).getName());
		}
	});
		
	return new SimpleScope(IScope.NULLSCOPE, scopedElements);
}

Regards,
ILyas

------
[1] http://www.eclipse.org/Xtext/documentation/0_7_2/xtext.html#scoping


ouakib schrieb:
> Hi all ,
> this is my grammar :
>
> Root: (root+=Model)* ;
> Class: "class" name=ID (elt+=Element)*  ;
> Element : Attribute | Ref ;
> Attribute : "var" name=ID ;
> Ref : "ref" name=[Attribute|ID] ;
>
> the attribute "name" in the element "Ref"  references all the elements 
> "Attribute"  in the model How I can restrict this reference to reference 
> only the "Attributres " which exists in then same  "Class"
> for instance in this model :
>
> class class1
>     var var1     var var2
> class class 2
>    var var3
>   var var4
>   ref  var1
>
> the reference to var1 from class2  must not work  because var1 must be 
> in class1.