[xtext-dev] how to resolve import files when using in standalone mode

[lee youpeng <loveyoupeng@xxxxxxxxx>]

hi,

 I am new to XText. I try to use the parser in standalone mode, however, it do not resole imported files automatically, how to make the parser to parser the imported files?

using the Xtext entity demo as an example:

// grammar

Model :
 (imports+=Import)*
 (elements+=Type)*;
 
Import :
 'import' importURI=STRING;
 
Type:
 SimpleType | Entity;
 
SimpleType:
 'type' name=ID;
 
Entity :
 'entity' name=ID ('extends' extends=[Entity])? '{'
  properties+=Property*
 '}';
......

 

 

DSL files:

 

// file a.dsl

entity A{}....

 

// file b.dsl

import "a.dsl"

 

entity B extends A{}

 

// standalone code

new org.eclipse.emf.mwe.utils.StandaloneSetup().setPlatformUri("../");
Injector injector = new MyDslStandaloneSetup().createInjectorAndDoEMFRegistration();
XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
Resource resource = resourceSet.getResource(
    URI.createURI("b.dsl"), true);
Model model = (Model) resource.getContents().get(0);

// it do not resolve a.dsl here and get null pointer error.