Class:
  'class' name=CLASS_NAME ('extends' superType=CLASS_NAME)? '{'
    (classSlots+=Slot)*
  '}';

RoleDefinition :
	type=[Class] 'playsRole' roleName=ID (('{' 
		(roleProperty += RoleProperty)+
		'}')? | ';')
	;

class Xpto {
     String field1;
     Integer field2;
     Boolean field1;
}

class Zen {
     String field1;
}

class Zorg {}

Zorg playsRole zorg;

grammar org.xtext.example.mydsl1.MyDsl1 with org.eclipse.xtext.common.Terminals

generate myDsl1 "http://www.xtext.org/example/mydsl1/MyDsl1"

Model:
	classes+=Class*
	roledefs+=RoleDefinition*
	;
	
Class:
  'class' name=CLASS_NAME ('extends' superType=CLASS_NAME)? '{'
   
  '}';

RoleDefinition :
	type=[Class|CLASS_NAME] 'playsRole' roleName=ID (('{' 
	
		'}')? | ';')
	;
	
CLASS_NAME : ID ("."ID)*;

class Xpto { 
}

class Zen {
}

class Zorg {}

class x.slkdasl.askdasl {}

x.slkdasl.askdasl playsRole zorg

Zorg playsRole zorg;

class House {

}

class Building {

}


House playsRole house;

Building playsRole house; 

org.example.ikea.Kitchen playsRole kitchen;

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

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

Model:
	classes+=Class*
	roledefs+=RoleDefinition*
	;
	
Class:
  'class' name=ID ('extends' superType=ID)? '{'
   
  '}';

RoleDefinition :
	(name=FQN | ref=[Class|ID]) 'playsRole' roleName=ID (('{' 
	
		'}')? | ';')
	;
	
FQN : ID ("."ID)+;

module org.xtext.example.mydsl.MyDsl

import org.eclipse.emf.mwe.utils.*
import org.eclipse.xtext.generator.*
import org.eclipse.xtext.ui.generator.*

var grammarURI = "classpath:/org/xtext/example/mydsl/MyDsl.xtext"
var file.extensions = "mydsl"
var projectName = "org.xtext.example.mydsl"
var runtimeProject = "../${projectName}"

Workflow {
    bean = StandaloneSetup {
		platformUri = "${runtimeProject}/.."
	}

	component = DirectoryCleaner {
		directory = "${runtimeProject}/src-gen"
	}

	component = DirectoryCleaner {
		directory = "${runtimeProject}.ui/src-gen"
	}

	component = Generator {
		pathRtProject = runtimeProject
		pathUiProject = "${runtimeProject}.ui"
		projectNameRt = projectName
		projectNameUi = "${projectName}.ui"
		language = {
			uri = grammarURI
			fileExtensions = file.extensions

			// Java API to access grammar elements (required by several other fragments)
			fragment = grammarAccess.GrammarAccessFragment {}

			// generates Java API for the generated EPackages 
			fragment = ecore.EcoreGeneratorFragment {
			// referencedGenModels = "uri to genmodel, uri to next genmodel"
			}

			// the serialization component
			fragment = parseTreeConstructor.ParseTreeConstructorFragment {}

			// a custom ResourceFactory for use with EMF 
			fragment = resourceFactory.ResourceFactoryFragment {
				fileExtensions = file.extensions
			}

			// The antlr parser generator fragment.
			fragment = parser.antlr.XtextAntlrGeneratorFragment {
			  options = {
					backtrack = true
				}
			}

			// java-based API for validation 
			fragment = validation.JavaValidatorFragment {
				composedCheck = "org.eclipse.xtext.validation.ImportUriValidator"
				composedCheck = "org.eclipse.xtext.validation.NamesAreUniqueValidator"
				// registerForImportedPackages = true
			}

			// scoping and exporting API
			// fragment = scoping.ImportURIScopingFragment {}
			// fragment = exporting.SimpleNamesFragment {}

			// scoping and exporting API 
			fragment = scoping.ImportNamespacesScopingFragment {}
			fragment = exporting.QualifiedNamesFragment {}
			fragment = builder.BuilderIntegrationFragment {}

			// formatter API 
			fragment = formatting.FormatterFragment {}

			// labeling API 
			fragment = labeling.LabelProviderFragment {}

			// outline API 
			fragment = outline.TransformerFragment {}
			fragment = outline.OutlineNodeAdapterFactoryFragment {}
			fragment = outline.QuickOutlineFragment {}

			// quickfix API 
			fragment = quickfix.QuickfixProviderFragment {}

			// content assist API  
			fragment = contentAssist.JavaBasedContentAssistFragment {}

			// generates a more lightweight Antlr parser and lexer tailored for content assist  
			fragment = parser.antlr.XtextAntlrUiGeneratorFragment {
				
				  options = {
					backtrack = true
				}
			}

			// project wizard (optional) 
			// fragment = projectWizard.SimpleProjectWizardFragment {
			// 		generatorProjectName = "${projectName}.generator" 
			//		modelFileExtension = file.extensions
			// }
		}
	}
}

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

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

Model:
	classes+=Class*
	roledefs+=RoleDefinition*
	;
	
Class:
  'class' name=ID ('extends' superType=ID)? '{'
   
  '}';

RoleDefinition :
	thing=Thing 'playsRole' roleName=ID (('{' 
	
		'}')? | ';')
	;
	
Thing : Named | Ref;
Named: name=FQN;
Ref: ref=[Class|ID];
	
	
FQN : ID ("."ID)+;