[news.eclipse.modeling.tmf] Re: Domain model example: Proposal with enti

[Ilyas Keser <ilyas.keser@xxxxxxxxx>]

Hi Knut,

thanks for your answer. In following I will try to provide more details:

The grammar GUIDSL defines references to EntityDsl. For example:

DataTable:
	'datatable' name=ID value=[entityDsl::Attribute|QualifiedName] '{' 
		(dataColumns+=DataColumn)+ 
	'}'; 
	
DataColumn:
	'datacolumn' header=STRING  value=[entityDsl::Attribute|QualifiedName];


---------------


Both EntityDsl and GUIDSL use a third grammar named Base(Grammar Mixing). For example QualifiedName is defined in Base:

QualifiedName :
	ID ('.' ID)*;


---------------


Part of EntityDsl:

Package:
	'package' name=QualifiedName '{'
		(elements+=Package | elements+=Entity)*
	'}';

Attribute:
	'attr' (static?='static')? name=ID ':' type=TypeRef;

Operation:
	'op' (visibility=Visibility)? name=ID'(' (parameters+=Parameter (',' parameters+=Parameter)*)? ')' ':' returnType=TypeRef;

Entity :
	'entity' name=ID ('extends' superType=[Entity|QualifiedName])? '{'
		(attributes+=Attribute)*
		(operations+=Operation)*
	'}';



-------------


And here is my ScopeProvider:

public class GUIDSLScopeProvider extends AbstractDeclarativeScopeProvider {

	public IScope scope_DataColumn_value(DataColumn context, EReference reference){
		return getEntityAttributesScope(context, reference);
	}

	public IScope getEntityAttributesScope(EObject context, EReference reference){
		
		if(reference.getEType() == EntityDslPackage.eINSTANCE.getAttribute()){
		
			// get imported entity model
			Model model = (Model)EcoreUtil.getRootContainer(context);
			Import imp = (Import)model.getImports().get(0);
			Resource importedResource = ImportUriUtil.getResource(imp.eResource(), imp.getImportURI());
			de.example.xtext.entityDsl.Model importedEntityModel = (de.example.xtext.entityDsl.Model)importedResource.getContents().get(0); 
			
			// get all attributes
			Collection<Object> allElements = GUIDSLScopeProvider.iteratorToCollection(
					EcoreUtil.getAllContents(importedEntityModel.getElements()));
			Collection<Attribute> attributes = EcoreUtil.getObjectsByType(
						allElements, EntityDslPackage.eINSTANCE.getAttribute());
			
			// compute attribute names and create scoped elements 
			Iterable<IScopedElement> scopedElements = Scopes.scopedElementsFor(attributes, new Function<EObject, String>() {
				public String apply(EObject from) {
					Attribute attribute = (Attribute)from;
					Entity entity = (Entity)attribute.eContainer();
					
					// return "my.package.EntityName.attributeName" if the entity in a package
					if(entity.eContainer() != null && entity.eContainer().eClass() == EntityDslPackage.eINSTANCE.getPackage()){
						Package pack = (Package)entity.eContainer();
						return (pack.getName() + "." + entity.getName() + "." + attribute.getName());
					}
					// return "EntityName.attributeName"
					return (entity.getName() + "." + attribute.getName());
				}
			});
			
			return new SimpleScope(IScope.NULLSCOPE, scopedElements);
		}
		
		return super.getScope(context, reference);
	}

	...
}


Thanks,
ILyas


Knut Wannheden schrieb:
> Hi Ilyas,
>
> Indeed it looks like a reference in your model cannot be linked. Thus 
> there is probably a problem with your scope provider. Please provide 
> more details (grammar, scope provider implementation, and example) so we 
> can help you resolve the problem.
>
> Regards,
>
> --knut
>
> Ilyas Keser wrote:
> > Hi,
> >
> > in all workflows the standalone setup registers all used ecore 
> > metamodels. Additionally in workflows for language generation the 
> > EcoreGeneratorFragment refers to required genmodels. And language 
> > generation works for my all DSLs... But, if I try to run the 
> > MyDslGenerator.mwe the references to "Attributes" can't be resolved:
> >
> >     ERROR eclipse.emf.mwe.core.WorkflowRunner .. "Couldn't resolve 
> > reference to Attribute".
> > I am using a custom scoping to get a modified content assist for 
> > Attributes (for example: org.my.package.MyClass.myAttribute instead of 
> > myAttribute). Can this error be related with my custom scoping? Or do 
> > I need to modify the linking mechanism of Xtext. I don't really 
> > understand (out of the documentation) when a custom linking mechanism 
> > is needed. Thanks,
> > ILyas
> >
> >
> >
> > Sebastian Zarnekow schrieb:
> > > Hi Ilyas,
> > >
> > > basically you'll have to register every references ecore metamodel in 
> > > the standalone setup. The type of your uris in your grammar has 
> > > nothing to do with the runtime or the fact that you have to register 
> > > metamodels in the standalone setup.
> > > Please refer the EMF book to get used to the various EMF concepts.
> > >
> > > Regards,
> > > Sebastian