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Xtext grammar generated from ECORE [message #778197]

Wed, 11 January 2012 15:59

Marcello Vitaletti

Messages: 7
Registered: July 2009

Junior Member

I am using Xtext to generate the grammar from a plain Ecore model using INDIGO SR1 with Xtext 2.0.1 SDK.
So for example I am getting the following grammar for a 'Pipe' class defined in my e Ecore model

Pipe returns Pipe:
{Pipe}
'Pipe'
name=EString
'{'
('length' length=EDouble)?
('fromNode' fromNode=[Node|EString])?
('toNode' toNode=[Node|EString])?
('group' group=[PipeGroup|EString])?
('data' data=PipeGroupData)?
'}';

When in the editor I tried to define a pipe I saw that I was forced to specify the attributes in the exact order in which they appear in the above grammar (length, fromNode, toNode, ...).

How can I avoid that restriction, perhaps changing the Ecore model or by tweaking the above grammar?

Thanks a lot!

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Re: Xtext grammar generated from ECORE [message #778202 is a reply to message #778197]

Wed, 11 January 2012 16:28

Meinte Boersma

Messages: 434
Registered: July 2009
Location: Leiden, Netherlands

Senior Member

You'll have to use an unordered group to achieve that: it's a standard feature of the Xtext grammar language and documented in the Reference Guide.

Xtext blogs: executable models...again? | workshop material | custom scoping with Xtend

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Re: Xtext grammar generated from ECORE [message #778420 is a reply to message #778197]

Wed, 11 January 2012 16:28

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Please refer to the section on unorderd groups in the reference
documentation.

Regards,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com

Am 11.01.12 16:59, schrieb Marcello Vitaletti:
> I am using Xtext to generate the grammar from a plain Ecore model using
> INDIGO SR1 with Xtext 2.0.1 SDK. So for example I am getting the
> following grammar for a 'Pipe' class defined in my e Ecore model
> Pipe returns Pipe:
> {Pipe}
> 'Pipe'
> name=EString
> '{'
> ('length' length=EDouble)?
> ('fromNode' fromNode=[Node|EString])?
> ('toNode' toNode=[Node|EString])?
> ('group' group=[PipeGroup|EString])?
> ('data' data=PipeGroupData)?
> '}';
>
> When in the editor I tried to define a pipe I saw that I was forced to
> specify the attributes in the exact order in which they appear in the
> above grammar (length, fromNode, toNode, ...).
> How can I avoid that restriction, perhaps changing the Ecore model or by
> tweaking the above grammar?
> Thanks a lot!

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