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Extending the Xtext Generator [message #1692552]

Thu, 16 April 2015 12:51

Adolfo Sanchez-Barbudo Herrera

Messages: 260
Registered: July 2009

Senior Member

Hi folks,

I'm trying to extend the Xtext generator so that, for instance, the generated MyDSLOutlineTreeProvider extends a CustomOutlineTreeProvider rather than the default one.

I started with trying a custom OutlineTreeProviderFragment extension, but the documentation says that fragment extensions are "rarely" needed, and indeed those fragments seem to involve some xpt files which I don't know what they are.

Any hint about how to approach with this kind of extension for the Xtext Generator.

Cheers,
Adolfo.

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Re: Extending the Xtext Generator [message #1692554 is a reply to message #1692552]

Thu, 16 April 2015 12:59

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

this question cannot be answered generally. the answer is "it depends" (on the fragment, on the kind of adoption, ...)

The generated outline tree provider is a generate once class so you would no adapt a fragment but simply change the class.
Or simply remove the fragment and add your own.

Some Fragments use Xtend, some use xpand. it should be possible to adopt it.

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Extending the Xtext Generator [message #1692571 is a reply to message #1692552]

Thu, 16 April 2015 14:37

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

IMHO the Outline is an area where Xtext does not do itself justice.

There could very easily be an Outline language with an Xtext editor to
define outlines.

The old org.eclipse.ocl.examples.editor.model was just such a model, but
with only a tree editor.

The new OCL autogeneration should be useable for a CS2Outline mapping
defined in OCL so that we get the benefit of accurate incremental rather
than total refresh.

Regards

Ed Willink

On 16/04/2015 13:52, Adolfo Sanchez-Barbudo Herrera wrote:
> Hi folks,
>
> I'm trying to extend the Xtext generator so that, for instance, the
> generated MyDSLOutlineTreeProvider extends a CustomOutlineTreeProvider
> rather than the default one.
>
> I started with trying a custom OutlineTreeProviderFragment extension,
> but the documentation says that fragment extensions are "rarely"
> needed, and indeed those fragments seem to involve some xpt files
> which I don't know what they are.
>
> Any hint about how to approach with this kind of extension for the
> Xtext Generator.
>
> Cheers,
> Adolfo.

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Re: Extending the Xtext Generator [message #1692594 is a reply to message #1692554]

Thu, 16 April 2015 16:39

Adolfo Sanchez-Barbudo Herrera

Messages: 260
Registered: July 2009

Senior Member

Hi Christian,

Thanks for the quick response and hints. So, those .xpt files are Xpand files which, AFAI have looked into, to be recognised they just need to have the name of the fragment class. Good.

I've not used Xpand before, but by taking the OutlineTreeProviderFragment.xpt as a guide (and after dealing with a minor file encoding issue), I've managed to successfully make the fragment extension work as I had planned.

Cheers,
Adolfo.

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