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Extend XBase grammar [message #1186378]

Thu, 14 November 2013 12:18

Eclipse User

Is it possible to extend the XBase grammar like this:

var customer = new Customer();
param var mcustomer = new Customer();

I'd like to mark the variables with the keyword "marked". So I tried to extend the XBase grammar with the following block:

XVariableDeclaration returns XExpression:
	{XVariableDeclaration}
	(param?='param')?(writeable?='var'|'val') (=>(type=JvmTypeReference name=ValidID) | name=ValidID) ('=' right=XExpression)?;

I read the article of Jan Köhnlein how to extend xbase grammar, but I don't really understand where to find the files DomainmodelTypeProvider and DomainmodelCompiler. Do I need to create them by myself in the dsl project?

Re: Extend XBase grammar [message #1186432 is a reply to message #1186378]

Thu, 14 November 2013 13:00

Eclipse User

Hi,

the article might be outdate due massive refactorings to xbase.

There is no subclass of XbaseCompiler created by default. so you have to subclass it yourself.
the type computation was changed in depth too. (XbaseTypeProvider is deprecated)

XbaseTypeComputer may be a good starting point

Re: Extend XBase grammar [message #1186460 is a reply to message #1186432]

Thu, 14 November 2013 13:17

Eclipse User

Btw what is the semantics of the param keyword?

Re: Extend XBase grammar [message #1188043 is a reply to message #1186460]

Fri, 15 November 2013 07:11

Eclipse User

I use param as a marker in order to add an annotation to the generated java code.

Like that, but param controls whether there is an annotation or not.

@Param
public String name = "World";

Re: Extend XBase grammar [message #1188058 is a reply to message #1188043]

Fri, 15 November 2013 07:25

Eclipse User

Hi,

i am not quite sure what your grammar looks like but i think
dothing this using the JvmModelInferrer might be a lot easier.
(XVariableDeclaration can be used inside blocks (e.g. method body) as well)

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