Game:
    'Game' name=ID grid=GridSize ...
;

GridSize:
   'Grid' 'size' size=Coordinates
;

Coordinates:
'('x=INT','y=INT')'
;
...

@Check
    def void checkGridCoordinates(Game game) {
    	val minValue = 1
    	val maxValue = 10
    	var x = game.grid.size.x
    	var y = game.grid.size.y
    	var literal = MetaGameLanguagePackage.Literals.GRID_SIZE__SIZE
    	
    	if(x < minValue || y < minValue){
    		error("Grid size must be at least 1.",literal)	
    	} else if(x > maxValue || y > maxValue) {
    		this.error("Grid size must be 10 or under.", literal)
    	}
    }

Description	Resource	Path	Location	Type
Error executing EValidator	TestingFile.gl	/IndividualExtension/src	/IndividualExtension/src/TestingFile.gl	GameLang Problem

@RunWith(XtextRunner)
@InjectWith(MyDslInjectorProvider)
class MyDslParsingTest {
	@Inject
	ParseHelper<Game> parseHelper
	
	@Inject
	extension ValidationTestHelper
	
	@Test
	def void loadModel() {
		val result = parseHelper.parse('''
			Game HelloWorld Grid size (1,11)
		''')
		Assert.assertNotNull(result)
		val errors = result.eResource.errors
		Assert.assertTrue('''Unexpected errors: «errors.join(", ")»''', errors.isEmpty)
		result.assertNoErrors // Triggers validation
	}
}

MetaGameLanguagePackage.Literals.GRID_SIZE__SIZE

@Check
def void checkGridCoordinates(GridSize grid) {
    	// Variables
    	var minValue = 1
    	var maxValue = 10
    	var x = grid.size.x
    	var y = grid.size.y
    	var gridSize = MetaGameLanguagePackage.eINSTANCE.gridSize_Size
    	
    	if(x < minValue || y < minValue){
    		error("Grid size must be at least 1.", gridSize)	
    	} else if(x > maxValue || y > maxValue) {
			error("Grid size must be 10 or under.", gridSize)
    	}
    }