| Java-like Scoping [message #736088] |
Thu, 13 October 2011 10:49  |
Eclipse User |
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Hello everyone,
since I have a DSL with nested elements, I thought it would be nice to let the user import external model files and call elements defined in those files.
Example:
file1.mydsl
package pack_extern {
entity ent_extern {
}
}
file2.mydsl
package pack1 {
import "platform:/resource/testProject/file1.mydsl"
entity ent1 {
attribute1 : int64
attribute2 : pack_extern.ent_extern
^^^
}
}
When importing an external resource, the elements defined in that resource become visible in the actual file.
In the example I marked the line
pack_extern.ent_extern
^^^
because I'm interested how such a mechanism should be implemented - only the root element should be visible and the user should "navigate" through the AST of that model and choose the element he wants (exactly like the import package mechanism of Java).
I read this discussion, but it did not work for me.
Here's what I have at the moment:
- the import mechanism works fine and the elements from extern model files are visible, but NOT like elementA.elementB
The workflow:
fragment = scoping.ImportURIScopingFragment {}
fragment = exporting.QualifiedNamesFragment {}
The overridden class:
public class MyDslNameProvider extends DefaultDeclarativeQualifiedNameProvider {
public String qualifiedName(EObject obj) {
return NodeModelUtils.getNode(obj).getParent().getText() + "." + NodeModelUtils.getNode(obj).getText();
}
}
If I try to write
and want to trigger the autocomplete, nothing happens. But before that, I get the following exception (not in my code):
org.eclipse.emf.common.util.WrappedException: java.lang.ClassCastException: java.lang.String cannot be cast to org.eclipse.xtext.naming.QualifiedName
at org.eclipse.xtext.linking.lazy.LazyLinkingResource.getEObject(LazyLinkingResource.java:205)
at org.eclipse.xtext.linking.lazy.LazyLinkingResource.resolveLazyCrossReference(LazyLinkingResource.java:141)
at org.eclipse.xtext.linking.lazy.LazyLinkingResource.resolveLazyCrossReferences(LazyLinkingResource.java:102)
at org.eclipse.xtext.EcoreUtil2.resolveLazyCrossReferences(EcoreUtil2.java:485)
at org.eclipse.xtext.validation.ResourceValidatorImpl.resolveProxies(ResourceValidatorImpl.java:127)
at org.eclipse.xtext.validation.ResourceValidatorImpl.validate(ResourceValidatorImpl.java:62)
at org.eclipse.xtext.ui.validation.DefaultResourceUIValidatorExtension.addMarkers(DefaultResourceUIValidatorExtension.java:65)
at org.eclipse.xtext.ui.validation.DefaultResourceUIValidatorExtension.updateValidationMarkers(DefaultResourceUIValidatorExtension.java:44)
at org.eclipse.xtext.builder.builderState.MarkerUpdaterImpl.updateMarker(MarkerUpdaterImpl.java:56)
at org.eclipse.xtext.builder.builderState.AbstractBuilderState.updateMarkers(AbstractBuilderState.java:76)
at org.eclipse.xtext.builder.clustering.ClusteringBuilderState.doUpdate(ClusteringBuilderState.java:199)
at org.eclipse.xtext.builder.builderState.AbstractBuilderState.update(AbstractBuilderState.java:107)
at org.eclipse.xtext.builder.impl.XtextBuilder.doBuild(XtextBuilder.java:158)
at org.eclipse.xtext.builder.impl.XtextBuilder.incrementalBuild(XtextBuilder.java:141)
at org.eclipse.xtext.builder.impl.XtextBuilder.build(XtextBuilder.java:91)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
I also tried implementing the IQualifiedNameProvider, but I did not succeed. Some examples would be great, unfortunately I didn't find any.
Suggestions/remarks? Any help is kindly appreciated.
EDIT: if I use
fragment = exporting.QualifiedNamesFragment {}
in the workflow, the auto-generated class AbstractDslUiModule has an error at the following lines:
// contributed by org.eclipse.xtext.generator.exporting.SimpleNamesFragment
public Class<? extends org.eclipse.xtext.ui.refactoring.IDependentElementsCalculator> bindIDependentElementsCalculator() {
return org.eclipse.xtext.ui.refactoring.IDependentElementsCalculator.Null.class;
}
reads "org.eclipse.xtext.ui.refactoring.IDependentElementsCalculator.Null cannot be resolved to a type" 
I also tried getting rid of the exception by implementing the method like this:
public QualifiedName qualifiedName(EObject obj) {
if(! (obj.eContainer() instanceof EObject))
return null;
else
return QualifiedName.create(NodeModelUtils.getNode(obj).getParent().getText(), NodeModelUtils.getNode(obj).getText());
}
The exception is no longer being thrown, but nothing happens, the feature I want to implement does not work.
[Updated on: Thu, 13 October 2011 11:03] by Moderator |
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| Re: Java-like Scoping [message #736244 is a reply to message #736117] |
Thu, 13 October 2011 17:09  |
| Eclipse User |
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Hi,
you could filter the proposals
or do it another way:
Model:
packages+=Package+;
Package:
"package" name=ID "{"
entities+=Entity*
"}"
;
Entity:
"entity" name=ID "{"
attributes+=Attribute*
"}"
;
Attribute:
name=ID ":" type=Type
;
Type:
SimpleType | Reference
;
SimpleType:
type=ID
;
Reference:
package=[Package] "." entity=[Entity]
;
public class MyDslScopeProvider extends AbstractDeclarativeScopeProvider {
IScope scope_Reference_entity(Reference r, EReference ref) {
return Scopes.scopeFor(r.getPackage().getEntities());
}
}
~Christian
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