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Xtend generator fails- attributes are not resolved [message #1798060]

Mon, 12 November 2018 07:23

Johan Lundberg

Messages: 8
Registered: November 2018

Junior Member

I followed this very good training material for advanced Xtext usage:

J.Hooman/DSL/AdvancedXtextManual.pdf

(I was not allowed to include the full hyperlink for some reason)

The problem starts in chapter 3.3.3
References between the two DSL files in runtime workspage works as in the example but the generator does not work- it just prints the text from the code:

Person: <<person.name>>
Greetings to: <<FOR greeting : person.greetings>> <<greeting.person.name>> (<<greeting.person.greetings.size>>)<<ENDFOR>>
<<FOR imp: person.imports>>
<<toText(imp)>>
<<ENDFOR>>

I have doublechecked the code several times to make sure it match the example.
MyDslGenerator.xtend looks as follows and match the example:

/*
* generated by Xtext 2.10.0
*/
package org.xtext.example.mydsl.generator

import org.eclipse.emf.ecore.resource.Resource
import org.eclipse.xtext.generator.AbstractGenerator
import org.eclipse.xtext.generator.IFileSystemAccess2
import org.eclipse.xtext.generator.IGeneratorContext
import org.xtext.example.mydsl.myDsl.Person
import org.xtext.example.mydsl.myDsl.Import

/**
* Generates code from your model files on save.
*
* See https://www.eclipse.org/Xtext/documentation/303_runtime_concepts.html#code-generation
*/
class MyDslGenerator extends AbstractGenerator {

override void doGenerate(Resource resource, IFileSystemAccess2 fsa, IGeneratorContext context) {
val root = ResourceUtils.resourceToEObject(resource) as Person;
fsa.generateFile(resource.getURI().lastSegment + '.txt', toText(root));
}

def static toText(Person person)
'''
Person: <<person.name>>
Greetings to: <<FOR greeting : person.greetings>> <<greeting.person.name>> (<<greeting.person.greetings.size>>)<<ENDFOR>>
<<FOR imp: person.imports>>
<<toText(imp)>>
<<ENDFOR>>

'''

def static toText(Import imp) {
val Person importedPerson = ResourceUtils.resourceToEObject(ResourceUtils.openImport(imp.eResource, imp.importURI)) as Person;
return
'''
Imported file: <<imp.importURI>>:
<<IF importedPerson == null>>
File cannot be opened.
<<ELSE>>
Number of greetings: <<importedPerson.greetings.size>>
<<ENDIF>>
'''
}
}

Should I file a bug? Which forum in that case?

Br Johan

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