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Associating data with EMF model [message #1787372]

Thu, 24 May 2018 08:22

Alex Mising name

Messages: 149
Registered: March 2010

Senior Member

Hello all,

Another one in my series of basic questions:

I understand that xtext generates a model based on my grammar (see model/generatoed/{x}.ecore

I would like to be able to associate extra data with some elements. For instance, the generated type for Field is:

  <eClassifiers xsi:type="ecore:EClass" name="Field">
    <eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
    <eStructuralFeatures xsi:type="ecore:EAttribute" name="presence" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
    <eStructuralFeatures xsi:type="ecore:EReference" name="fieldEncodingType" eType="#//TypeDeclaration"/>
    <eStructuralFeatures xsi:type="ecore:EAttribute" name="id" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"/>
    <eStructuralFeatures xsi:type="ecore:EReference" name="semanticType" eType="#//SemanitTypeModifier"
        containment="true"/>
  </eClassifiers>

Now, I want to add an integer called "offset"

    <eStructuralFeatures xsi:type="ecore:EAttribute" name="offset" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"/>

Is it possible to instruct xtext to do that during some post-processing of the model?

Please note that I understand the obvious: I could just change the grammar to include that attribute "(offset=INT)?", just wondering if there's a way to do this without cluttering the grammar: I really don't mean to give the option for a user of the grammar to type that extra integer as it makes no sense.

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Re: Associating data with EMF model [message #1787373 is a reply to message #1787372]

Thu, 24 May 2018 08:27

Karsten Thoms

Messages: 762
Registered: July 2009
Location: Dortmund, Germany

Senior Member

Just do not generate the ecore model from your grammar, manually maintain it and import it in your grammar.

Additional state can be derived using the IDerivedStateComputer interface together with an DerivedStateAwareResource. Use the Guice modules to bind the customizations.

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