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Integrating Xbase in my DSL. How to activate scoping and validation? [message #1743395]

Wed, 14 September 2016 22:49

Florian König

Messages: 30
Registered: June 2014

Member

Hi,

I want to create an extension for my DSL that can integrate Xbase code for special behavior. The new DSL shall :
- import EClasses from an ecore model file in the workspace (this works)
- specify methods with parameters, return values and a Xbase expression block

My current prototype can do this, but the scoping and validation of the Xbase block does not work.

The following is my example code:

grammar examplesystem.dsl.MyDsl with org.eclipse.xtext.xbase.Xbase

generate myDsl "http://www.dsl.examplesystem/MyDsl"
import "http://www.eclipse.org/xtext/xbase/Xbase" as xbase
import "http://www.eclipse.org/emf/2002/Ecore" as ecore

Operations:
	'import' importURI=STRING
	('domain' domains+=[ecore::EPackage])*
	'operations' '{'
	operations+=MyOperation*
	'}';

MyOperation:
	'operation' name=ID '(' (parameters+=Parameter (',' parameters+=Parameter)*)? ')' 'returns' type=[ecore::EClassifier]
	body=XBlockExpression;

Parameter:
	{Parameter}
	type=[ecore::EClassifier] name=ID;

Example model:
index.php/fa/27071/0/

Xtext with broken scoping and validation:
index.php/fa/27073/0/

Now my question: What do I have to change to fix the problems? Is there a proper guide or tutorial for Xtext 2.10?

I have added my example projects as attachment to this post.

Thanks in advance,
Florian

Attachment: ExampleSystemModel.PNG
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Attachment: ExampleXtext_.PNG
(Size: 67.02KB, Downloaded 510 times)
Attachment: source-projects-xtext-example.zip
(Size: 2.21MB, Downloaded 102 times)
Attachment: runtime-workspace-example.zip
(Size: 36.05KB, Downloaded 98 times)

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Re: Integrating Xbase in my DSL. How to activate scoping and validation? [message #1743402 is a reply to message #1743395]

Thu, 15 September 2016 06:10

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

you did not implement the JvmModelInferrer.
the jvmmodelinferrer is THE keypart to get xbase running.

you map your dsl concepts to java types
and your expression places to expression places in java like field initializers and method bodys.

http://www.eclipse.org/Xtext/documentation/104_jvmdomainmodel.html

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

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Re: Integrating Xbase in my DSL. How to activate scoping and validation? [message #1743443 is a reply to message #1743402]

Thu, 15 September 2016 13:51

Florian König

Messages: 30
Registered: June 2014

Member

Well you are correct, I didn't implement the JvmModelInferrer. I also haven't encountered this tutorial before. Thanks for the link Smile

I recreated my example project using the tutorial. The imports and the validation and scoping now works correctly in the XBlockExpression.

grammar examplesystem.dsl.MyDsl with org.eclipse.xtext.xbase.Xbase

generate myDsl "http://www.dsl.examplesystem/MyDsl"
import "http://www.eclipse.org/xtext/xbase/Xbase" as xbase
import "http://www.eclipse.org/emf/2002/Ecore" as ecore

Operations:
	{Operations}
	importSection=XImportSection?
	operations+=MyOperation*;

MyOperation:
	'operation' name=ValidID '(' (parameters+=FullJvmFormalParameter (',' parameters+=FullJvmFormalParameter)*)? ')'
	'returns' type=JvmTypeReference
	body=XBlockExpression;

However now I have to generate java code for my models to import them using XImportSection. How can I import the EClasses to use them in the XBlockExpression and parameters? Is this possible without code generation?

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Re: Integrating Xbase in my DSL. How to activate scoping and validation? [message #1743448 is a reply to message #1743443]

Thu, 15 September 2016 14:03

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

i am not sure of what you are talking.

import section is for jvm imports only. if you put the javaclasses of the metamodel on the classpath your should be able to work with them.

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

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