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Local Scope and Shadowing [message #705343]

Fri, 29 July 2011 18:55

Rafael Angarita

Messages: 94
Registered: November 2010

Member

Hello, I've been reading other posts and blogs about local scoping but I don't getting, I think I am missing something.

Here is my example:

Model:
	A |
	R
;

A:
	'A' name=ID
;

R:
	'R' name=ID
	objectReference=ObjectReference
	innerObject=InnerObject
;
InnerObject:
	'innerObject' name=STRING
;

ObjectReference:
	object=[ecore::EObject]
;

My scope provider, where I filter objects by they file extension:

public IScope scope_ObjectReference_object(EObject i, EReference r) {
		return new org.eclipse.xtext.scoping.impl.FilteringScope(delegateGetScope(i, r),new Predicate<IEObjectDescription>() {
			@Override
			public boolean apply(IEObjectDescription input) {
				
				return input!=null && input.getEObjectURI()!=null &&  input.getEObjectURI().fileExtension()!=null &&
						(input.getEObjectURI().fileExtension().equals("a")
								);

			};
		});
		
	}

Now, I want to write this code:

file: R.r

R myr
mya   
innerObject 'mya'

file: mya.a

A mya

, but as expected, innerObject 'mya' shadows the object in mya.a, so I get "Couldn't resolve reference to EObject 'mya'".

How should I do this?

Thank you very much for your help and advices.

PD: I noted the filtering does not work since the local object "mya" shadows the global object before the call to the scope_ObjectReference_object method.

[Updated on: Fri, 29 July 2011 18:59]

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