| Using ParseHelper outside of the test project [message #1771002] |
Mon, 21 August 2017 04:26  |
 Rohit Verma
Messages: 21
Registered: August 2017 |
Junior Member |
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I am trying to use Xtext to write a parser for a project that uses EMF metamodels (ECore files) as its backbone. The idea is that I create a new Xtext project (from existing Ecore models), select the relevant ECore files to generate the grammar and get an autogenerated parser.
Now, in this metamodel, there will be a node "Expression" which will have leaves as, say -- an integer literal and operator. So my objective is that I should be able to pass as arguments an expression like -- 10+6 and I should get in return the concrete syntax tree (Like I should know 10 is a literal integer, "+" is an operator, etc. ). Currently I am able to do this by using the XtextResourceSet class as below where I am returned the elements in this tree in a "EObjectContainmentList". However, this required me to use a file (t.dmodel in the example) which I cannot use in my project for some reason.
I looked in the ParseHelper class which lets me do the same thing without having to have an intermediate file. However, this does not work for me when I use the class outside the test project. If I try to, the object of the parsehelper is always returned as null. Why cannot I do this, I don't seem to understand -- request your help here.
// Sample code for XtextResourceSet which works
Injector injector = new DomainmodelStandaloneSetup().createInjectorAndDoEMFRegistration();
XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
Resource resource = resourceSet.getResource(
URI.createURI("t.dmodel"), true);
EObject myModel = resource.getContents().get(0);
// Sample code for ParseHelper which doesn't work
Injector injector = new DomainmodelStandaloneSetup().createInjectorAndDoEMFRegistration();
XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
ParseHelper<?> parseHelper = new ParseHelper();
try {
parseHelper.parse("");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
I get the same issue if I try to inject the right classes like this:
@RunWith(XtextRunner.class)
@InjectWith(DomainmodelInjectorProvider.class)
@SuppressWarnings("all")
public class DomainmodelParsingTest {
@Inject
private ParseHelper<Domainmodel> parseHelper;
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