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Xtext dsl file extensions [message #708178]

Tue, 02 August 2011 10:38

Eclipse User

I have a DSL as:
grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

import "http://www.eclipse.org/emf/2002/Ecore" as ecore

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

Model:
"my invitations:" name=ID ("extends" extensions+=ID (',' extensions+=ID)*)? "{"
invitations=Invitations
"}"
;

Invitations:
greetings+=Greeting+;

Greeting:
'Hello' name=ID '!';

--------------------------------------

My intention is to able to support grammar files like:

invite1.mydsl:
my invitations:invite1{
Hello William!
}

invite2.mydsl:
my invitations:invite2 extends invite1{
Hello Columbus!
}

The above two file should result as:
my invitations:invite2 {
Hello William!
Hello Columbus!
}

Could someone suggest what should be the way to approach this.

Thanks

Re: Xtext dsl file extensions [message #708264 is a reply to message #708178]

Tue, 02 August 2011 12:02

Eclipse User

A couple of observations:
- do not use space in keywords. Replace
"my invitations:"
with
"my" "invitations" ":"

- Use [ ] for cross references. i.e.
(extensions += [Invite] (',' extensions += [Invite])*)?

- Your Invitation is called "Model" suggest changing that to Invite
(that is what I used in the example above).

Note that [Invite] is shorthand for [Invite|ID] and it cross references
to Invite.name by default. How the cross referencing actually finds
stuff is determined by how you decide to handle scopes in general - if
user needs to import what is to be visible, if it is visible by virtue
of being on the OSGi "classpath", by Eclipse project dependency
configuration (or some other scheme of your own).

Hope that helps.
Regards
- henrik

On 8/2/11 4:38 PM, sungam wrote:
> I have a DSL as:
> grammar org.xtext.example.mydsl.MyDsl with
> org.eclipse.xtext.common.Terminals
>
> import "http://www.eclipse.org/emf/2002/Ecore" as ecore
>
> generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"
>
> Model:
> "my invitations:" name=ID ("extends" extensions+=ID (','
> extensions+=ID)*)? "{"
> invitations=Invitations
> "}"
> ;
>
> Invitations:
> greetings+=Greeting+;
>
> Greeting:
> 'Hello' name=ID '!';
>
> --------------------------------------
>
> My intention is to able to support grammar files like:
>
> invite1.mydsl:
> my invitations:invite1{
> Hello William!
> }
>
>
> invite2.mydsl:
> my invitations:invite2 extends invite1{
> Hello Columbus!
> }
>
> The above two file should result as:
> my invitations:invite2 {
> Hello William!
> Hello Columbus!
> }
>
> Could someone suggest what should be the way to approach this.
>
> Thanks
>
>
>
>

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