CODEWITHSUNDEEP
dslxtext
user3510462
user3510462

Reputation: 35

Xtext - how to use "import" in own grammar

I have an own Xtext grammar definition:

grammar org.xtext.example.mydsl.MyOtherDsl with org.eclipse.xtext.common.Terminals

generate myOtherDsl "http://www.xtext.org/example/mydsl/MyOtherDsl"

OtherModel:
    Foo | Bar;

Foo: 'foo' name=ID;

Bar: 'bar' name=ID;

Now, I want to use this grammar in the (standard example) Xtext grammar via an "import":

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

import "http://www.xtext.org/example/mydsl/MyOtherDsl" as other

Model:
    greetings+=Greeting*
    foobars+=FooBar*;

Greeting: 'Hello' name=ID '!' foo=[other::Foo];

FooBar:  other::Foo | other::Bar;

While Greeting: 'Hello' name=ID '!' foo=[other::Foo]; is working, FooBar: other::Foo | other::Bar; throws an error: no viable alternative at input 'other'. In the Greeting rule I use the reference for an attribute (foo). In the FooBar rule I just want to use it as a type. How can I do it?

Any help appreciated.

Thanks, Andreas

Upvotes: 2

Views: 1193

Answers (1)

Christian Dietrich
Christian Dietrich

Reputation: 11868

Xtext only Supports a Single Inhertiance Hierarchy

grammar org.xtext.example.mydsl.MyDslBase with org.eclipse.xtext.common.Terminals
grammar org.xtext.example.mydsl.MyDslGrandParent with org.xtext.example.mydsl.MyDslBase
grammar org.xtext.example.mydsl.MyDslParent with org.xtext.example.mydsl.MyDslGrandParent
grammar org.xtext.example.mydsl.MyDslChild with org.xtext.example.mydsl.MyDslParent

so it is not possible to spilt them up into several and group them togther in one dsl

Upvotes: 2

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