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beginner question [message #1007706]

Thu, 07 February 2013 08:26

Claudio Persico

Messages: 24
Registered: November 2012

Junior Member

Hi to everyone,

I'm totally new to Xtext and I'm not sure if it's suited for my need.

I have a structured comma separated value file with strings and numbers like this:

["string1", 10,5,1,4]
["string2", 5,6,1,9]
etc etc.

I also have an ECORE metamodel that represents these information.

I would like to extract the information from the textual file and create an ecore model conforming to the metamodel I have.

Is it possible to do this feature with Xtext?
If yes, what can I read about?

Thanks in advance,
Claudio

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Re: beginner question [message #1007735 is a reply to message #1007706]

Thu, 07 February 2013 11:04

Christophe Bouhier

Messages: 937
Registered: July 2009

Senior Member

Hi Cladio,

xtext will generate the meta model for you.
So you could write your grammar in an .xtext and generate the code.
the examples and documentation are really good I think.
http://www.eclipse.org/Xtext/documentation.html
Cheers Christophe

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Re: beginner question [message #1007751 is a reply to message #1007735]

Thu, 07 February 2013 12:08

Claudio Persico

Messages: 24
Registered: November 2012

Junior Member

Thank you for your reply,

I need the model, not the metamodel. I already have the metamodel of the output.

Do I need to define the grammar of the input (the text) and also of the output (my metamodel written in ecore)? Or I simply define only my input grammar and it translates in ecore?

Thanks in advance,

Claudio

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Re: beginner question [message #1007767 is a reply to message #1007751]

Thu, 07 February 2013 13:00

Christophe Bouhier

Messages: 937
Registered: July 2009

Senior Member

This is somewhat of an unusual case. Normally, the whole idea is to
define an xtext grammar, to obtain the meta model. So "your_csv.format".ecore

http://www.eclipse.org/Xtext/documentation.html#metamodelInference

If you already have this .ecore, then I am not sure, how you would deal with this.
Maybe the .mwe2 file can reference the existing .ecore.

Anyway, if you define the grammar, you get the .ecore so nothing to loose really. And you can compare it with your existing metamodel. The actual model, or the model instance as some like to call it will be generated when you open a file ending with instance.your_csv.format. Then the text is parsed, linked etc.. producing your instance model in an XtextResource. Actually your text file IS the model instance in a way.

This could help understanding the concept.

http://www.eclipse.org/Xtext/documentation.html#emf_integration

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Re: beginner question [message #1007868 is a reply to message #1007767]

Thu, 07 February 2013 20:21

Christophe Bouhier

Messages: 937
Registered: July 2009

Senior Member

actually, there is an option to start a new Xtext project from an existing .ecore. just select new -> Xtext project from existing Ecore Models.
I have never used it, but perhaps something worth checking out.

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Re: beginner question [message #1007972 is a reply to message #1007751]

Thu, 07 February 2013 17:48

Christian Dietrich

Messages: 13359
Registered: July 2009

Senior Member

It is possible to define a grammar for an existing metamodel (there is
even a wizard for that)
but note: you might get trouble if the metamodel and the concrete
syntax are too far from each other.

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Re: beginner question [message #1007980 is a reply to message #1007706]

Fri, 08 February 2013 09:01

Jan Koehnlein

Messages: 760
Registered: July 2009
Location: Hamburg

Senior Member

Look for 'generated ecore model' in the Xtend docs
http://www.eclipse.org/Xtext/documentation.html#metamodelInference

Am 07.02.13 09:26, schrieb Claudio Persico:
> Hi to everyone,
>
> I'm totally new to Xtext and I'm not sure if it's suited for my need.
>
> I have a structured comma separated value file with strings and numbers
> like this:
>
> ["string1", 10,5,1,4]
> ["string2", 5,6,1,9]
> etc etc.
>
> I also have an ECORE metamodel that represents these information.
>
> I would like to extract the information from the textual file and create
> an ecore model conforming to the metamodel I have.
>
> Is it possible to do this feature with Xtext?
> If yes, what can I read about?
>
> Thanks in advance,
> Claudio

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

---
Get professional support from the Xtext committers at www.typefox.io

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