Xtext - Couldn't resolve reference to JvmOperation

Question

I am trying to create a small DSL language using XText.

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.xbase.Xbase import "http://www.eclipse.org/xtext/common/JavaVMTypes" as jvmTypes generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

StartState:
'startState'
     'evaluate' ref=JvmTypeReference "-" op=[jvmTypes::JvmOperation]
'end';

Following is the ScopeProvider Implementation:

public class MyScopeProvider extends AbstractDeclarativeScopeProvider {

IScope scope_StartState_op(StartState call, EReference reference) {
    JvmType type = call.getRef().getType();
    List<IEObjectDescription> descriptions = new ArrayList<IEObjectDescription>();

    if (type instanceof JvmGenericType) {
        JvmGenericType gt = (JvmGenericType) type;
        for (JvmMember member : gt.getMembers()) {
            if (member instanceof JvmOperation) {
                descriptions.add(EObjectDescription.create(member.getSimpleName(), member));
            }
        }
    }
    return new SimpleScope(descriptions);
}}

I type following into the resulting editor

startState evaluate controller.Controller - perform end

Here I am able to get the code completion working for method (perform which is in controller.Controller class) as expected. But I am in need of help to resolve the following error which happens after the code completion.

Couldn't resolve reference to JvmOperation 'perform'.

Also, I tried following Peter's Blog with no success

which xtext version do you use? how does the declaration line of the grammar look like? it works fine for me using 2.8.2 and inhering org.eclipse.xtext.xbase.Xtype — Christian Dietrich
@ChristianDietrich - I added the grammar at the top of the question. Please have a look. Also I am using Xtext 2.8.2 on Luna Service Release 2 (4.4.2) Build id: 20150219-0600 — Stack Overflow
@ChristianDietrich - Thank you very much for the tip. I was using org.eclipse.xtext.xbase.Xbase instead of org.eclipse.xtext.xbase.Xtype — Stack Overflow

Stack Overflow Stack Overflow · Accepted Answer · 2015-05-03T23:57:43

Posting answer to my own question. The grammer should look like the following.

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.xbase.Xtype import "http://www.eclipse.org/xtext/common/JavaVMTypes" as jvmTypes generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

StartState: 'startState' 'evaluate' ref=JvmTypeReference "-" op=[jvmTypes::JvmOperation] 'end';

There is no change to the scope provider and the usage.

Xtext - Couldn't resolve reference to JvmOperation

1 Answers