| Acceleo and Xtext [message #902535] |
Sat, 18 August 2012 04:44  |
Eclipse User |
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I am in the middle of an ACCELEO Transformation aimed at producing code (i.e. Java) from an input UML model.
Some elements of this UML model (i.e. Activities Opaque actions) contain some text which is conform to an Xtext grammar and I'd like to get the equivalent AST Ecore representation in the ACCELEO transformation.
To this end I have developed a Java class with a method which takes as input a string, containing the DSL excerpt, and produces an ECORE model conform to it (see http://www.eclipse.org/forums/index.php/m/901947/#msg_901947 for further details). I have tested it in a separate Java application and it seems it works properly.
I have therefore written a simple ACCELEO module (i.e. getDSLModel) wrapping that java class and enabling me to get the Ecore model from the DSL textual representation.
Suppose my DSL (and the equivalent ECORE) consist of a root element named DSLModel containing a (0..*) number of DSLStatements (this is a simplification).
When in ACCELEO I invoke the wrapper from a string, containing a correct dsl script, i have noticed it correctly returns a ModelImpl
['statement1;statement2'.getDSLModel()/]
so the Java service and the XText parse is working.
However if I try to get the model statements, i.e.:
['statement1;statement2'.getDSLModel().statements/]
it returns an **"invalid"** string. So I can't use it in a for loop
I have therefore tried to call the eAllContents() ocl service from the model instance i.e.:
['statement1;statement2'.getDSLModel().eAllContents()/]
and it actually returns the list of statements. I do not understand why the features of the Ecore entities returned from the Xtext parser are not working properly.
Any help would be very appreciated! Thank you
here is the Java service which turns a string into a instance of my DSL model (ECORE AST). I have tested it with an independent Java application and it works fine!
public class GetDSLModel {
public DSLModel getDSLModel(String expression){
DSLStandaloneSetupGenerated dslsas = new DSLStandaloneSetupGenerated();
Injector injector = dslsas.createInjectorAndDoEMFRegistration();
XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
Resource resource = resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
InputStream in = new ByteArrayInputStream(expression.getBytes());
try {
resource.load(in, resourceSet.getLoadOptions());
DSLModel model = (DSLModel) resource.getContents().get(0);
return model;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
Now I need the AST in the main ACCELEO (UML2Text) transformation thus here is the Acceleo wrapper
[query public getDSLModel(str:String): DSLModel = (invoke('sfg.baleno.src.mloaders.GetDSLModel','getDSLModel(java.lang.String)',Sequence{str})).oclAsType(DSLModel)/]
here is what I get if run it
input: ['statement1;statement2'.getDSLModel()/]
output: mypackage.dsl.impl.DSLModelImpl@a1c7a
input: ['statement1;statement2'.getDSLModel().statements/] (Syntactically VALID)
output: invalid
input: ['statement1;statement2'.getDSLModel().eAllContents()/]
output: mypackage.dsl.impl.DSLStatement@e53202 (......
Some hours later
In the Java Class of the main ACCELEO module I have added the following lines
@Override
public void initialize(EObject element, File folder, java.util.List<? extends Object> arguments) throws IOException { preInitialize();
super.initialize(element, folder, arguments);
}
@Override
public void initialize(URI modelURI, File folder, java.util.List<?> arguments) throws IOException {
preInitialize();
super.initialize(modelURI, folder, arguments);
}
protected void preInitialize() {
DSLStandaloneSetup.doSetup();
}
and
@Override
public void registerPackages(ResourceSet resourceSet) {
super.registerPackages(resourceSet);
if (!isInWorkspace(org.eclipse.uml2.uml.UMLPackage.class)) {
resourceSet.getPackageRegistry().put(org.eclipse.uml2.uml.UMLPackage.eINSTANCE.getNsURI(), org.eclipse.uml2.uml.UMLPackage.eINSTANCE);
}
if (!isInWorkspace(mypackages.DSLPackage.class)) {
resourceSet.getPackageRegistry().put(mypackages.DSLPackage.eINSTANCE.getNsURI(), mypackages.DSLPackage.eINSTANCE);
}
EcoreUtil.resolveAll(resourceSet);
}
but it still behaves the same.
Is there anyone who managed to use Xtext with Acceleo this way?
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| Re: Acceleo and Xtext [message #902541 is a reply to message #902535] |
Sat, 18 August 2012 05:49  |
| Eclipse User |
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Hi
You have been asking this question for some time on the M2T mailing
list, which is where it belongs.
However you just provide us parts of your program without any indication
how you invoke them.
The more partial information you provide the less attractive it is to
try to help you.
As Christian demonstrated, the basic functionality work fine, so
somewhere you are doing something odd, and you have not told us about it.
If you want help, you need to help yourself, by helping us. Provide a
simple zipped project and launch configuration that demonstrates the
problem. Do not provide snippets that require us to spend time
mis-re-developing what you have failed to provide.
Regards
Ed Willink
On 18/08/2012 09:44, Andrea Sindico wrote:
> I am in the middle of an ACCELEO Transformation aimed at producing
> code (i.e. Java) from an input UML model.
> Some elements of this UML model (i.e. Activities Opaque actions)
> contain some text which is conform to an Xtext grammar and I'd like to
> get the equivalent AST Ecore representation in the ACCELEO
> transformation.
> To this end I have developed a Java class with a method which takes as
> input a string, containing the DSL excerpt, and produces an ECORE
> model conform to it (see
> http://www.eclipse.org/forums/index.php/m/901947/#msg_901947 for
> further details). I have tested it in a separate Java application and
> it seems it works properly.
>
> I have therefore written a simple ACCELEO module (i.e. getDSLModel)
> wrapping that java class and enabling me to get the Ecore model from
> the DSL textual representation.
>
> Suppose my DSL (and the equivalent ECORE) consist of a root element
> named DSLModel containing a (0..*) number of DSLStatements (this is a
> simplification). When in ACCELEO I invoke the wrapper from a string,
> containing a correct dsl script, i have noticed it correctly returns a
> ModelImpl
> ['statement1;statement2'.getDSLModel()/]
>
> so the Java service and the XText parse is working.
> However if I try to get the model statements, i.e.:
>
> ['statement1;statement2'.getDSLModel().statements/]
>
> it returns an **"invalid"** string. So I can't use it in a for loop
>
> I have therefore tried to call the eAllContents() ocl service from the
> model instance i.e.:
>
> ['statement1;statement2'.getDSLModel().eAllContents()/]
>
> and it actually returns the list of statements. I do not understand
> why the features of the Ecore entities returned from the Xtext parser
> are not working properly.
> Any help would be very appreciated! Thank you
>
>
>
> here is the Java service which turns a string into a instance of my
> DSL model (ECORE AST). I have tested it with an independent Java
> application and it works fine!
>
>
> public class GetDSLModel {
> public DSLModel getDSLModel(String expression){
> DSLStandaloneSetupGenerated dslsas = new
> DSLStandaloneSetupGenerated();
> Injector injector = dslsas.createInjectorAndDoEMFRegistration();
> XtextResourceSet resourceSet =
> injector.getInstance(XtextResourceSet.class);
> resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL,
> Boolean.TRUE);
> Resource resource =
> resourceSet.createResource(URI.createURI("dummy:/example.dsl"));
> InputStream in = new ByteArrayInputStream(expression.getBytes());
> try {
> resource.load(in, resourceSet.getLoadOptions());
> DSLModel model = (DSLModel) resource.getContents().get(0);
> return model;
> } catch (IOException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> return null;
>
> }
>
> }
>
> Now I need the AST in the main ACCELEO (UML2Text) transformation thus
> here is the Acceleo wrapper
>
>
> [query public getDSLModel(str:String): DSLModel =
> (invoke('sfg.baleno.src.mloaders.GetDSLModel','getDSLModel(java.lang.String)',Sequence{str})).oclAsType(DSLModel)/]
>
>
> here is what I get if run it
> input: ['statement1;statement2'.getDSLModel()/]
> output: mailto:mypackage.dsl.impl.DSLModelImpl@a1c7a
>
> input: ['statement1;statement2'.getDSLModel().statements/]
> (Syntactically VALID)
> output: invalid
>
> input: ['statement1;statement2'.getDSLModel().eAllContents()/]
> output: mailto:mypackage.dsl.impl.DSLStatement@e53202 (......
>
> Some hours later
>
> In the Java Class of the main ACCELEO module I have added the
> following lines
>
> @Override
> public void initialize(EObject element, File folder,
> java.util.List<? extends Object> arguments) throws IOException {
> preInitialize();
> super.initialize(element, folder, arguments);
> }
> @Override
> public void initialize(URI modelURI, File folder, java.util.List<?>
> arguments) throws IOException {
> preInitialize();
> super.initialize(modelURI, folder, arguments);
> }
> protected void preInitialize() {
> DSLStandaloneSetup.doSetup();
> }
>
> and
>
> @Override
> public void registerPackages(ResourceSet resourceSet) {
> super.registerPackages(resourceSet);
> if (!isInWorkspace(org.eclipse.uml2.uml.UMLPackage.class)) {
> resourceSet.getPackageRegistry().put(org.eclipse.uml2.uml.UMLPackage.eINSTANCE.getNsURI(),
> org.eclipse.uml2.uml.UMLPackage.eINSTANCE);
> }
> if (!isInWorkspace(mypackages.DSLPackage.class)) {
> resourceSet.getPackageRegistry().put(mypackages.DSLPackage.eINSTANCE.getNsURI(),
> mypackages.DSLPackage.eINSTANCE);
> }
> EcoreUtil.resolveAll(resourceSet);
> }
>
> but it still behaves the same.
> Is there anyone who managed to use Xtext with Acceleo this way?
>
>
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it is about 1.9 MB but it is the whole workspace encompassing the four Xtext projects plus the Acceleo one. Anyway How may I share it with you? is it ok by email?