grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.xbase.Xbase

generate myDsl "h__p://www.xtext.org/example/mydsl/MyDsl"

SomeModel :
   'test' ':' expressionValue = XExpression
;

class MyDslJvmModelInferrer extends AbstractModelInferrer {

   @Inject extension JvmTypesBuilder

   def dispatch void infer(SomeModel element, IJvmDeclaredTypeAcceptor acceptor, boolean isPreIndexingPhase) {
      // assuming:  test: 1 + 1
      val returnType = element.newTypeRef(Integer.TYPE)
      acceptor.accept(element.toClass("ClassName")).initializeLater [
         documentation = element.documentation;
         members += element.toMethod("method", returnType) [
            body = element.expressionValue
         ]
      ]
   }
}

@RunWith (XtextRunner)
@InjectWith (MyDslInjectorProvider)
class TestInferrer {

   @Inject extension ParseHelper<SomeModel>
   @Inject extension ValidationTestHelper
   @Inject extension CompilationTestHelper // deps:  org.eclipse.xtext.xbase.junit / org.eclipse.jdt.core


   @Test
   def void test() {''' test : 1 + 1'''.parse.assertNoErrors}

   @Test
   def javaGen() {
      '''test : 1 + 1'''
      .compile[
         print (generatedCode)
         compiledClass
      ]
   }
}

{ClassName=@SuppressWarnings("all")
public class ClassName {
  public int method() {
    int _plus = (1 + 1);
    return _plus;
  }
}
}

// works
test : 1
test : "string".toLowerCase.length
test : Integer.valueOf(1)
test : if (true) 1 else 2
// does not work
test : 1 + 1