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Post-processing the generated genmodel? [message #1067763]

Wed, 10 July 2013 13:36

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Hi,

I've been successfully using an IXtext2EcorePostProcessor in one of my projects.
Now I wonder if it is possible to also post-process the generated genmodel, in my case in order to set a rootExtendsInterface attribute.

So, when the post-processor is invoked, does the genmodel already exist in memory? Is there a way to get hold of that either from a IXtext2EcorePostProcessor or using a similar hook?

In other projects I'm happy with manually maintaining the meta model, but in this project the language isn't quite mature enough, i.e., I still want Xtext to generate the meta model whenever the grammar is changed.

TIA,
Stephan

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Re: Post-processing the generated genmodel? [message #1067813 is a reply to message #1067763]

Wed, 10 July 2013 16:41

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi what about to override and use org.eclipse.xtext.generator.ecore.EcoreGeneratorFragment.getGenModel(ResourceSet, Grammar, XpandExecutionContext, List<EPackage>)

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Post-processing the generated genmodel? [message #1067815 is a reply to message #1067813]

Wed, 10 July 2013 16:56

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Thanks for the hint. Sounds cool.

Two issues
- @noextend This class is not intended to be subclassed by clients.
- EvaluationException : No Definition MyProcessingEcoreGenerator::generate(String) for org::eclipse::xtext::impl::GrammarImpl could be found! Internal error : element was null

any ideas?

Apart from these issues, the modification of the genmodel works fine, actually!

I'll keep trying,
Stephan

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Re: Post-processing the generated genmodel? [message #1067819 is a reply to message #1067815]

Wed, 10 July 2013 17:05

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi you may have to override the template detection meachism too to
take the old fragments package and not yours

--
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Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Post-processing the generated genmodel? [message #1067822 is a reply to message #1067819]

Wed, 10 July 2013 17:25

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

yep, thanks, I added this:

	@Override
	protected String getTemplate() {
		return EcoreGeneratorFragment.class.getName().replaceAll("\\.", "::");
	}

And now I can modify the genmodel on the fly (provided I don't worry to much about the @noextend tag Smile

)

thanks,
Stephan

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Re: Post-processing the generated genmodel? [message #1067829 is a reply to message #1067822]

Wed, 10 July 2013 18:11

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Btw feel free to file a enhancement request for this

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Post-processing the generated genmodel? [message #1067986 is a reply to message #1067829]

Thu, 11 July 2013 15:00

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Trying my trick during maven build the MWE2Launcher couldn't resolve MyProcessingEcoreGenerator and I was quite at a loss about this difference between directly invoking the .mwe2 (OK) and letting fornax do this (NOK).

The only way I could fix that was creating a new project just for that one class and have it built before the main xtext project.
Yea, maybe better integrating this with Xtext would help, but to really tell I would need better understanding of how the MWE2Launcher finds any classes of the current project when invoked via maven/fornax.

For my own application things are fine.

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