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Unability to serialize an Xtext grammar created with EMF [message #1853849]

Tue, 19 July 2022 17:00

Jules BOYER

Messages: 2
Registered: July 2022

Junior Member

Dear all,

I am looking for help in using the Xtext serializer to save an Xtext grammar that was programmatically created as an EMF resource.

My various attempts always fail when it comes to using the save instruction from the XtextResource (log error in screenshot below).

My project consists in creating an Xtext grammar resulting from the merge of several grammars, after which this new grammar needs to be serialized. While the creation of the new grammar as well as the imports of the rules coming from the other grammars work perfectly, exceptions are triggered when it comes to saving the resource. I have been looking for examples that showcase the use of the resource and serializer in similar cases, but did not manage to find anything relevant.

Please find below other pieces of information and screenshots featuring how I use the serializer and what error is triggered in the process.

I use eclipse 2022-06 and org.eclipse.justj.openjdk.hotspot.jre.full.linux.x86_64_18.0.1.v20220515-1614 as a JRE.

Here is the constructor in wich you can see how the serializer is created starting from line 132:

index.php/fa/42315/0/

Here is how I generate the new Xtext Grammar using the previous serializer and options:

index.php/fa/42317/0/

Here is the log error printed when trying to run it:

index.php/fa/42318/0/

Attachment: Constructor1.PNG
(Size: 84.00KB, Downloaded 368 times)
Attachment: Constructor2.PNG
(Size: 115.67KB, Downloaded 356 times)
Attachment: GenerateXtext.PNG
(Size: 56.50KB, Downloaded 323 times)
Attachment: LogError.png
(Size: 122.54KB, Downloaded 361 times)

[Updated on: Thu, 21 July 2022 13:02]

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Re: Unability to serialize an Xtext grammer created with EMF [message #1853854 is a reply to message #1853849]

Wed, 20 July 2022 04:28

Christian Dietrich

Messages: 14729
Registered: July 2009

Senior Member

The code looks very strange
Normally stuff is created using injectors and not using new

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

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Re: Unability to serialize an Xtext grammer created with EMF [message #1853895 is a reply to message #1853854]

Thu, 21 July 2022 13:02

Jules BOYER

Messages: 2
Registered: July 2022

Junior Member

Hello,

Thanks for answering, if you know how to make a "normal" code used to generate an Xtext grammar programatically, do you mind sharing an example ?
Or if you don't have one, can you maybe further explain the procedure in making it ?

Unfortunately, I won't be able to progress much just by knowing I need to use injectors.

Thanks in advance ,

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Re: Unability to serialize an Xtext grammer created with EMF [message #1853900 is a reply to message #1853895]

Thu, 21 July 2022 15:33

Christian Dietrich

Messages: 14729
Registered: July 2009

Senior Member

what i dont understand is the copy part and how this one will/should survive the move to the new grammar.
so you do not only create a grammar programmatically but also do that one.
so how will the references from the old grammar be moved to the new grammar.
my proposal would be to just do it on text level.

this naive one is working for me

public class Snippet {
public static void main(String[] args) throws IOException {
// TerminalsStandaloneSetup.doSetup();
Injector i = new XtextStandaloneSetup().createInjectorAndDoEMFRegistration();
ResourceSet sourceRS = i.getInstance(ResourceSet.class);
Resource sourceR = sourceRS.getResource(URI.createURI("/home/dietrich/eclipse-workspaces/xxxxxxxxxx/org.xtext.example.mydsl/src/org/xtext/example/mydsl/MyDsl.xtext"), true);
sourceR.load(null);
EcoreUtil.resolveAll(sourceR);
System.out.println(sourceR.getErrors());

ResourceSet targetRS = i.getInstance(ResourceSet.class);
Resource targetR = targetRS.createResource(URI.createURI("MyDsl2.xtext"));

Grammar grammar = XtextFactory.eINSTANCE.createGrammar();
grammar.setName("Demo");
GeneratedMetamodel x = XtextFactory.eINSTANCE.createGeneratedMetamodel();
x.setName("bla");
EPackage p = EcoreFactory.eINSTANCE.createEPackage();
p.setName("bla");
p.setNsPrefix("bla");
p.setNsURI("http://demo");
x.setEPackage(p);
grammar.getMetamodelDeclarations().add(x);
targetR.getContents().add(grammar);

Grammar sourceG = (Grammar) sourceR.getContents().get(0);

List<AbstractRule> rulesList = new ArrayList<>();

for (AbstractRule r : sourceG.getRules()) {
rulesList.add(r);
}

for (AbstractRule r : rulesList) {
grammar.getRules().add(r);
}

for (Grammar ug : sourceG.getUsedGrammars()) {
targetRS.getResources().add(ug.eResource());
grammar.getUsedGrammars().add(ug);
}

ISerializer ser = i.getInstance(ISerializer.class);
System.out.println(ser.serialize(grammar));

}
}

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

[Updated on: Thu, 21 July 2022 15:40]

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