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Reference Ecore model in Xtext grammar [message #1848017]

Wed, 17 November 2021 08:18

Eclipse User

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.

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

Wed, 17 November 2021 08:36

Eclipse User

the grammar makes no sense

maybe

you intend

Greeting:
type = [EPackage|STRING]
;

which means reference epackage by string lexer rule

Re: Reference Ecore model in Xtext grammar [message #1848020 is a reply to message #1848017]

Wed, 17 November 2021 08:40

Eclipse User

[Updated on: Wed, 17 November 2021 08:41] by Moderator

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

Wed, 17 November 2021 09:53

Eclipse User

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".

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

Wed, 17 November 2021 11:33

Eclipse User

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

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