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Bi-directional reference [message #1851123]

Mon, 28 March 2022 12:01

John Henbergs

Messages: 239
Registered: October 2020

Senior Member

Hi all,

I was wondering how I can write the grammar for bi directional references where one side is a containment.
If we take the following example:

index.php/fa/41819/0/

The only way I can think of writing this is the following:

Test returns Test:
{Test}
test = [Test | FQN]
 ('{' testeOpposite +=Test ( "," testeOpposite +=Test)* '}' )

However, this is not the same because in this case I get:
index.php/fa/41820/0/

Is there any way around this?

Thank you!

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Re: Bi-directional reference [message #1851128 is a reply to message #1851123]

Mon, 28 March 2022 13:16

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

maybe you can simply use a containment ref and do the opposite e.g. via giving
the generic eContainer a different name via eoperation

or you simply just use eContainer and live with it.

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

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Re: Bi-directional reference [message #1851135 is a reply to message #1851128]

Mon, 28 March 2022 15:38

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Xtext is a powerful grammar tool that often produces a useful Ecore metamodel as a side effect.

However if you want to control your metamodel explicitly rather than accidentally you should treat your *.ecore development as your primary activity and then use it with rather than generate it from Xtext.

Regards

Ed Willink

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