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How do I filter the result of AbstractDeclarativeScopeProvider.delegateGetScope()? [message #897741]

Wed, 25 July 2012 03:57

Aaron Digulla
Messages: 234
Registered: July 2009
Location: Switzerland

Senior Member

I have a language which allows to extend base models:

lib B extends A {}

When I try code completion after "extends", Xtext offers me "B" which doesn't make sense. So I wrote a method in ModelScopeProvider which extends AbstractDeclarativeScopeProvider:

public IScope scope_Lib_baseLib( Lib lib, EReference ref ) {
IScope delegateScope = delegateGetScope( lib, ref );

... remove "lib" from delegateScope ...
return delegateScope;
}

How do remove lib from delegateScope?

Regards,

A. Digulla

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Re: How do I filter the result of AbstractDeclarativeScopeProvider.delegateGetScope()? [message #897745 is a reply to message #897741]

Wed, 25 July 2012 04:04

Aaron Digulla
Messages: 234
Registered: July 2009
Location: Switzerland

Senior Member

Okay, I'm one step further:

    public IScope scope_Lib_baseLib( Lib lib, EReference ref ) {
        IScope delegateScope = delegateGetScope( lib, ref );

        Predicate<IEObjectDescription> filter = new Predicate<IEObjectDescription>() {
            @Override
            public boolean apply( IEObjectDescription input ) {
                return !input.getEObjectOrProxy().equals( lib );
            }
        };
        result = new FilteringScope( delegateScope, filter  ); 
        return result;
    }

Is this the correct way to compare an IEObjectDescription and an EObject to see whether they are equal?

Regards,

A. Digulla

[Updated on: Wed, 25 July 2012 04:14]

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Re: How do I filter the result of AbstractDeclarativeScopeProvider.delegateGetScope()? [message #897790 is a reply to message #897745]

Wed, 25 July 2012 05:01

Christian Dietrich
Messages: 4387
Registered: July 2009

Senior Member

Hi for perf reasons: why dont you simply compare the libs qualified
name (I qualified name provider) with the eobjectdesxriptions
qualified name

--
Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

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Re: How do I filter the result of AbstractDeclarativeScopeProvider.delegateGetScope()? [message #897858 is a reply to message #897790]

Wed, 25 July 2012 06:24

Aaron Digulla
Messages: 234
Registered: July 2009
Location: Switzerland

Senior Member

Christian Dietrich wrote on Wed, 25 July 2012 11:01

for perf reasons: why dont you simply compare the libs qualified
name (I qualified name provider) with the eobjectdesxriptions
qualified name

Two reasons:

1. I'm not sure how Xtext builds qualified names and whether it's guaranteed that the same symbols have the same name (someone said EMF proxies don't have qualified names)

2. Because I don't know how to get a qualified name for an EObject.

Regards,

A. Digulla

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Re: How do I filter the result of AbstractDeclarativeScopeProvider.delegateGetScope()? [message #897863 is a reply to message #897858]

Wed, 25 July 2012 06:28

Christian Dietrich
Messages: 4387
Registered: July 2009

Senior Member

I said: ask the ieobjectdescription for its qualifiedname and use an
injected Iqualifiednameprovider to obtain the qualifiedname of your
local eobject

--
Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

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Re: How do I filter the result of AbstractDeclarativeScopeProvider.delegateGetScope()? [message #897901 is a reply to message #897863]

Wed, 25 July 2012 07:56

Aaron Digulla
Messages: 234
Registered: July 2009
Location: Switzerland

Senior Member

Is this code correct, then?

    @Inject
    private IQualifiedNameProvider qualifiedNameProvider;

    public IScope scope_Lib_baseLib( Lib lib, EReference ref ) {
        IScope delegateScope = delegateGetScope( lib, ref );

        final QualifiedName nameFilter = qualifiedNameProvider.getFullyQualifiedName( lib );
        Predicate<IEObjectDescription> filter = new Predicate<IEObjectDescription>() {
            @Override
            public boolean apply( IEObjectDescription input ) {
                return !nameFilter.equals( input.getQualifiedName() );
            }
        };
        IScope result = new FilteringScope( delegateScope, filter  ); 

        return result;
    }

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Re: How do I filter the result of AbstractDeclarativeScopeProvider.delegateGetScope()? [message #897917 is a reply to message #897901]

Wed, 25 July 2012 08:31

Christian Dietrich
Messages: 4387
Registered: July 2009

Senior Member

Yes

--
Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

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Re: How do I filter the result of AbstractDeclarativeScopeProvider.delegateGetScope()? [message #897939 is a reply to message #897917]

Wed, 25 July 2012 09:29

Aaron Digulla
Messages: 234
Registered: July 2009
Location: Switzerland

Senior Member

Thanks a lot Smile

After my horrible experience earlier this week, I'm overcautious.

Regards,

A. Digulla

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