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Eclipse Modeling

1 Eclipse Modeling

Eclipse Modeling

2 Xtext

http://www.openarchitectureware.org/pub/documentation/4.3/html/contents/xtext_tutorial.html#xtext_dsl_grammar

2.1 Customizing Xtext

2.1.1 Syntax Highlighting

http://www.drdobbs.com/architecture-and-design/customizing-xtext/231902091?pgno=3

Go to the pre-existing org.*.Domainmodel.ui package in the org.*.Domainmodel.ui project

1. Create two components or classes.
   • HighlightingConfiguration, for defining the high lighting style
   • SemanticHighlightingCalculator, for finding the high lighting elements.
2. Bind the two components to the UI.

The HighlightingConfiguration class example:

public class DomainmodelHighlightingConfiguration extends DefaultHighlightingConfiguration 
{
 
    public static final String DATA_TYPE_ID = "datatype";
 
    public void configure(IHighlightingConfigurationAcceptor
 acceptor)
    {
        super.configure(acceptor);
        acceptor.acceptDefaultHighlighting(
DATA_TYPE_ID, "DataType", dataTypeTextStyle());
    }
 
    public TextStyle dataTypeTextStyle()
    {
        TextStyle textStyle = defaultTextStyle().copy();
        textStyle.setStyle(SWT.ITALIC);
        return textStyle;
    }
}

The SemanticHighlightingCalculator class example:

public class DomainmodelSemanticHighlightingCalculator implements ISemanticHighlightingCalculator
{
    public void provideHighlightingFor(XtextResource resource,
            IHighlightedPositionAcceptor acceptor)
{
        for(Iterator<EObject> contents = resource.getAllContents();
            contents.hasNext(); )
        {
            EObject element = contents.next();
            if (element instanceof Feature &&
                ((Feature) element).getType() instanceof DataType)
                highlightAsDataType(element,
                    DomainmodelPackage.Literals.FEATURE__TYPE,
                    acceptor);
            else if(element instanceof DataType)
                highlightAsDataType(element,
                    DomainmodelPackage.Literals.TYPE__NAME,
                    acceptor);
        }
    }
     
    protected void highlightAsDataType(EObject element,
            EStructuralFeature feature,
            IHighlightedPositionAcceptor acceptor){
        for(INode node:
            NodeModelUtils.findNodesForFeature(element, feature))
            acceptor.addPosition(node.getOffset(),
               node.getLength(),                         
                   DomainmodelHighlightingConfiguration.DATA_TYPE_ID);
    }
}

Bind the ighlightingConfiguration to the UI. Add the following methods in the pre-existing class DomainmodelUiModule Class.

public Class<? extends DefaultHighlightingConfiguration> bindSemanticConfig() {
        return DomainmodelHighlightingConfiguration.class;
    }

public Class<? extends ISemanticHighlightingCalculator> bindISemanticHighlightingCalculator() {
        return DomainmodelHighlightingCalculator.class;
    }

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