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Reference Ecore model in Xtext grammar [message #1848017]

Wed, 17 November 2021 13:18

Jan Crkvic

Messages: 18
Registered: November 2021

Junior Member

Hello, I am trying to import the Ecore meta model in the xtext grammar so that I can use EPackage.

This is a simple grammar:

grammar org.xtext.Mapping with org.eclipse.xtext.common.Terminals
import "h.ttp://www.eclipse.org/emf/2002/Ecore" as ecore
generate mapping "h.ttp://www.xtext.org/Mapping"

Model:
	greetings+=Greeting*;
	
Greeting:
	type = EPackage
;

However on the second line I get this warning:

Quote:

The imported package is not on the classpath of this project
which may lead to follow-up errors.

And on the second to last line I get this error:

Quote:

EPackage cannot be resolved to a rule.

Help on being able to reference an EPackage, would be appreciated.
Thank you.

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Re: Reference Ecore model in Xtext grammar [message #1848019 is a reply to message #1848017]

Wed, 17 November 2021 13:36

Christian Dietrich

Messages: 14492
Registered: July 2009

Senior Member

the grammar makes no sense

maybe

you intend

Greeting:
type = [EPackage|STRING]
;

which means reference epackage by string lexer rule

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/it-services/methods-and-tools/xtext
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Re: Reference Ecore model in Xtext grammar [message #1848020 is a reply to message #1848017]

Wed, 17 November 2021 13:40

Tamas Miklossy

Messages: 146
Registered: February 2016

Senior Member

[Updated on: Wed, 17 November 2021 13:41]

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Re: Reference Ecore model in Xtext grammar [message #1848022 is a reply to message #1848019]

Wed, 17 November 2021 14:53

Jan Crkvic

Messages: 18
Registered: November 2021

Junior Member

Hi,

Yes I am trying to reference it so that should be the correct way to write. Thank you! However, now I get "Cannot resolve type null".

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Re: Reference Ecore model in Xtext grammar [message #1848029 is a reply to message #1848022]

Wed, 17 November 2021 16:33

Christian Dietrich

Messages: 14492
Registered: July 2009

Senior Member

can you please give more steps what exactly you are doing and what is not working

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/it-services/methods-and-tools/xtext
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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