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[SOLVED] Transformation of Abstract Syntax Tree [message #642005]

Mon, 29 November 2010 14:12

Florian Gessner

Messages: 20
Registered: November 2010

Junior Member

Hi all,

is it possible to manipulate the abstract syntax tree programatically? If yes, is there a default approach how to do this?

I need this to do some defaulting which depends on input of the user.

If I have understood the user guide right, XTEND can only be used for M2M transformation during parser generation but not during runtime.

Thank and Best Regards
Florian

[Updated on: Wed, 01 December 2010 07:02]

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Re: Transformation of Abstract Syntax Tree [message #642032 is a reply to message #642005]

Mon, 29 November 2010 15:39

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Florian,

you are free to use the EMF API to manipulate the semantic model.
Call resource#save() to persist your changes. Please have a look at
http://koehnlein.blogspot.com/2010/06/semantic-model-access- in-xtext.html for
more information.

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

Am 29.11.10 15:12, schrieb Florian Gessner:
> Hi all,
>
> is it possible to manipulate the abstract syntax tree programatically?
> If yes, is there a default approach how to do this?
>
> I need this to do some defaulting which depends on input of the user.
>
> If I have understood the user guide right, XTEND can only be used for
> M2M transformation during parser generation but not during runtime.
>
> Thank and Best Regards
> Florian

Report message to a moderator

Re: Transformation of Abstract Syntax Tree [message #642086 is a reply to message #642005]

Mon, 29 November 2010 18:39

Florian Gessner

Messages: 20
Registered: November 2010

Junior Member

Hi Sebastian,

thanks for your fast reply.
The example described in the blog uses the IDocumentEditor to manipulate the data. I do not want to implement this in the UI layer but in the backend.
I think EMF should would independent from this, but for me it is not clear how I can integrate this into the backend. I think it would be a bit strange if I would enrich the model by some logic during validation or linking. Or is this how it works?

The best solution would be to have a post-processing step after linking.

Thanks and best regards
Florian

[Updated on: Tue, 30 November 2010 09:27]

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Re: Transformation of Abstract Syntax Tree [message #642346 is a reply to message #642086]

Tue, 30 November 2010 21:39

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Florian,

you can use the resource / EMF API directly in a plain (non-interactive)
environment.
If you want to enrich your model you should investigate using imported
metamodels and derived properties for the derivable information.
However, the Linker#afterModelLinked is usually a good place to enhance
the model.

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

Am 29.11.10 19:39, schrieb Florian Gessner:
> Hi Sebastian,
>
> thanks for your fast reply.
> The example described in the blog uses the IDocumentEditor to manipulate
> the data. I do not want to implement this in the UI layer but in the
> backend.
> I think EMF should would independent from this, but for me it is not
> clear how I can integrate this into the backend. I think it would be a
> bit strange if I would enrich the model by some logic during validation
> or linking. Or is this how it works?
>
> Thanks and best regards
> Florian

Report message to a moderator

Re: Transformation of Abstract Syntax Tree [message #642382 is a reply to message #642005]

Wed, 01 December 2010 07:02

Florian Gessner

Messages: 20
Registered: November 2010

Junior Member

Hi Sebastian,

I now solve the issue be creating an own implementation of LazyLinker and adding the required logic after the linking process. This can easly be done by overwriting the link model method.

Thanks and Best Regards
Florian

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