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Is it possible to write the dsl validations in xtend2? [message #710786]

Fri, 05 August 2011 08:02

Eclipse User

Is it possible to write the DSL validations in Xtend2?
It would be nice to use the Xtend features in this place.

I've tried to create a module MyDslValidator.xtend in the example project:

package org.xtext.example.mydsl.validation

import org.eclipse.xtext.validation.Check
import org.xtext.example.mydsl.myDsl.*
import org.xtext.example.mydsl.myDsl.MyDslPackage

class MyDslValidator extends AbstractMyDslJavaValidator {

//	@Check
//	public void checkUniqueAttrNameIgC (Attribute a)
//	{
//		Entity e = (Entity)(a.eContainer());
//		for ( Attribute a1 : e.getAttributes() ) {
//			if ( a1 == a ) continue;
//			if ( a.getName().toUpperCase().equals(a1.getName().toUpperCase()) )	{
//				warning("Names should be unique ignoring case", 
//						MyDslPackage.Literals.ATTRIBUTE__NAME);
//			}
//		}
//	}
	
	@Check
	def void checkUniqueAttrNameIgC (Attribute a)
	{
		if ( (a.eContainer as Entity).attributes
				.filter( a1 | a.name.toUpperCase == a1.name.toUpperCase)
				.size == 1 )
			return
		error("Names should be unique ignoring case",
			MyDslPackage.Literals.ATTRIBUTE__NAME)
	}
}

but the MyDslPackage.Literals.ATTRIBUTE__NAME causes problems

- Couldn't resolve reference to JvmIdentifiableElement 'ATTRIBUTE__NAME'.
- Couldn't resolve reference to JvmIdentifiableElement 'Literals'.
- Couldn't resolve reference to JvmIdentifiableElement 'MyDslPackage'.

Re: Is it possible to write the dsl validations in xtend2? [message #710789 is a reply to message #710786]

Fri, 05 August 2011 08:15

Eclipse User

Hi,

the Syntax is MyDslPackage$Literals::GREETING__NAME. of couse you have to import MydslPackage Wink

~Christian

Re: Is it possible to write the dsl validations in xtend2? [message #710813 is a reply to message #710789]

Fri, 05 August 2011 08:38

Eclipse User

Hi Nikolai!

You should subclass the original validator, since the workflow would recreate the Java stub again which conflicts with the generated Xtend class.

~Karsten

Re: Is it possible to write the dsl validations in xtend2? [message #710872 is a reply to message #710813]

Fri, 05 August 2011 10:17

Eclipse User

Hi Christian and Karsten,

thanks a lot for the quick help. This way it works fine:

.../org.xtext.example.mydsl/src/org/xtext/example/mydsl/validation/MyDslXtendValidator.xtend

package org.xtext.example.mydsl.validation

import org.eclipse.xtext.validation.Check
import org.xtext.example.mydsl.myDsl.*

class MyDslXtendValidator extends MyDslJavaValidator {
	@Check
	def checkUniqueAttrNameIgC (Attribute a)
	{
		if ( (a.eContainer as Entity).attributes
				.filter( a1 | a.name.toUpperCase == a1.name.toUpperCase)
				.size == 1 )
			return;
		error("Names should be unique ignoring case",
			  MyDslPackage$Literals::ATTRIBUTE__NAME
		)
	}
}

and add in

.../org.xtext.example.mydsl/src/org/xtext/example/mydsl/MyDslRuntimeModule.java

public class MyDslRuntimeModule extends org.xtext.example.mydsl.AbstractMyDslRuntimeModule {
	// contributed by org.eclipse.xtext.generator.validation.JavaValidatorFragment
	@org.eclipse.xtext.service.SingletonBinding(eager=true)	
	public Class<? extends org.xtext.example.mydsl.validation.MyDslJavaValidator> bindMyDslJavaValidator() {
		return org.xtext.example.mydsl.validation.MyDslXtendValidator].class;
	}
}

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