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instantiate object with type parameter [message #1783870]

Mon, 19 March 2018 18:00

Christian Deussen

Messages: 2
Registered: March 2018

Junior Member

Hi,

I have a simple model with a generic class.
I want to create an xtext grammar which can instantiate the class with a type parameter.

TestClass returns TestClass:
        {TestClass}
        'TestClass'
        '{'
                ('typedAClass' typedAClass=[TypedClass<CustomTypeA>])?
                ('typedBClass' typedBClass=[TypedClass<CustomTypeB>])?
        '}';

TypedClass<T> returns TypedClass<T>:
        {TypedClass<T>}
        'TypedClass'
        ;

Is this possible with xtext? I havent been able to find an example using generic objects.

Thank you.

Attachment: model.png
(Size: 95.96KB, Downloaded 20 times)

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Re: instantiate object with type parameter [message #1783878 is a reply to message #1783870]

Mon, 19 March 2018 19:18

Christian Dietrich

Messages: 12388
Registered: July 2009

Senior Member

Can you please give more context

I would have expected something like (pseudo code)

GT: ref=Type (‚<‚ params+=Gt (‚,' params +=GT)*'<‚)?

Need professional support for Xtext, Xpand, EMF?
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Blog : https://www.dietrich-it.de

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Re: instantiate object with type parameter [message #1783879 is a reply to message #1783878]

Mon, 19 March 2018 19:23

Christian Dietrich

Messages: 12388
Registered: July 2009

Senior Member

And no xtext has no support for Emf generics if that is what you are looking for

Need professional support for Xtext, Xpand, EMF?
Go to: https://xtext.itemis.com
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Mon, 19 March 2018 19:24]

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Re: instantiate object with type parameter [message #1783882 is a reply to message #1783879]

Mon, 19 March 2018 20:38

Christian Deussen

Messages: 2
Registered: March 2018

Junior Member

Christian Dietrich wrote on Mon, 19 March 2018 19:23

And no xtext has no support for Emf generics if that is what you are looking for

Thank you. This answers my question.

I wonder if there is another way to to get emf generics to work.
Will binding the type parameter in concrete classes work?

TestClass returns TestClass:
	{TestClass}
	'TestClass'
	'{'
		('typedAClass' typedAClass=[ConcreteAClass])?
		('typedBClass' typedBClass=[ConcreteAClass])?
	'}';

ConcreteAClass returns ConcreteAClass:
	{ConcreteAClass}
	'ConcreteAClass'
;

Attachment: model2.png
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