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Concrete to abstract syntax [message #1838495]

Fri, 26 February 2021 12:54

John Henbergs

Messages: 239
Registered: October 2020

Senior Member

Hi all,

I am trying to write an Xtext abstract syntax from an example of the concrete one. However, there is one part as follows.
"port.event1", "port.event2", or "event()".

Any ideas on how that would work or how could be implemented?

Furthermore, do you have any advice on what is the best way to go from an envisioned concrete syntax to an abstract syntax?

Many thanks,
John

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Re: Concrete to abstract syntax [message #1838510 is a reply to message #1838495]

Fri, 26 February 2021 17:37

Ed Willink

Messages: 7670
Registered: July 2009

Senior Member

Hi

OCL and QVT have a specification-imposed abstract syntax and a user grammar friendly concrete syntax. This is a very major pain for which some generalized CS2AS tooling was developed by
Adolfo Sanchez-Barbudo Herrera [1] to modelize the manual code in the OCL and QVT projects. You can follow the references to find his EngD.

If you really must have a large gap between CS and AS then a form of transformation is unavoidable.

However I very strongly recommend revisiting the models to make the AS a little more CS friendly so that you can avoid the needless transformation which is poor;y supported by Xtext.

Regards

Ed Willink

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