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Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #670321]

Fri, 13 May 2011 10:05

Eclipse User

Hello

I created new DSL which is extension of an existing one. There is a link that I was following but I cannot send it now Razz

The title of the post is Xtext 1.0.0 and UML (Xpand on top)
In my case I didn't use UML meta model but the metamodel generated by another Xtext (base) grammar. The editor is working just fine.
The new grammar looks as follows:

grammar org.xtext.example.libExt.LibExt with org.eclipse.xtext.common.Terminals

generate libExt "URI_of_new_DSL"

import "URI_of_base_DSL" as building

Model:
 	(imports+=Import)*
 	(bref+=BuildingRef)*	 
 ;
 
Import :
 'import' importURI=STRING;

BuildingRef:
	"REF" name=ID ref=[building::Building|ID];

One note here: As you can see, in the models that conform with this grammar I allow import of model created in the base DSL.

However I tried to make small template in the generator project, and there were no errors found. However, I got errors when running the workflow mwe2 file of the .generator project. I got something like :
Couldn't resolve reference to Building 'Tower'
Does anyone know something about proper configuring of mwe2 of generator project when having imported metamodel in the Xtext grammar? Some useful links or maybe tips how to do this?
Thanks in advance
Nikola.

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #670327 is a reply to message #670321]

Fri, 13 May 2011 10:20

Eclipse User

Hi,

did you something like

register = org.xtext.example.mydsl.MyDslAStandaloneSetup {}
register = org.xtext.example.mydsl.MyDslBStandaloneSetup {}

in your generator projects workflow?

~Christian

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #670345 is a reply to message #670327]

Fri, 13 May 2011 11:27

Eclipse User

Hi Christian
I tried but again the same error appears. This is my workflow file:

module workflow.BdlGenerator

import org.eclipse.emf.mwe.utils.*


var targetDir = "src-gen"
var fileEncoding = "Cp1252"
var modelPath = "src/model"

Workflow {

	component = org.eclipse.xtext.mwe.Reader {
		// lookup all resources on the classpath
		//useJavaClassPath = false

		// or define search scope explicitly
		path = modelPath
		skipOnErrors = true
		
		// this class will be generated by the xtext generator
		register = org.xtext.example.mydsl.MyDslAStandaloneSetup {}
		register = org.xtext.example.mydsl.MyDslBStandaloneSetup {}

		
		load = {
			slot = "system"
			type = "BDL"
		}
	}

	component = org.eclipse.xpand2.Generator {
		metaModel = org.eclipse.xtend.typesystem.emf.EmfMetaModel {
			metaModelPackage = "org.xtext.example.mydsl.MyDslAPackage"
		}
		
		metaModel = org.eclipse.xtend.typesystem.emf.EmfMetaModel {
			metaModelPackage = "org.xtext.example.mydsl.MyDslBPackage"
		}
		
		expand = "templates::Template::main FOREACH greetings"
		
		outlet = {
			path = targetDir
		}
		fileEncoding = fileEncoding
	}
}

Also I put dependencies in MANIFEST.MF, but still the same error appears.

Nikola

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #670352 is a reply to message #670345]

Fri, 13 May 2011 11:45

Eclipse User

Hi,

can you please post the complete error message?

and can you post example models?

btw

there is something wrong with your workflow Wink

you read BDL into the slot system but call the generator with greetings

[Updated on: Fri, 13 May 2011 11:46] by Moderator

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #670354 is a reply to message #670345]

Fri, 13 May 2011 11:50

Eclipse User

Hi Christian
I solved the problem. The code that I've added is:

        bean = org.eclipse.emf.mwe.utils.StandaloneSetup {
	 	platformUri=".."
	}

and now the workflow file looks like:

module workflow.BdlGenerator

import org.eclipse.emf.mwe.utils.*


var targetDir = "src-gen"
var fileEncoding = "Cp1252"
var modelPath = "src/model"

Workflow {

	bean = org.eclipse.emf.mwe.utils.StandaloneSetup {
	 	platformUri=".."
	}

	component = org.eclipse.xtext.mwe.Reader {
		// lookup all resources on the classpath
		//useJavaClassPath = false

		// or define search scope explicitly
		path = modelPath
		skipOnErrors = true
		
		// this class will be generated by the xtext generator
		register = org.xtext.example.mydsl.MyDslAStandaloneSetup {}
		register = org.xtext.example.mydsl.MyDslBStandaloneSetup {}

		
		load = {
			slot = "system"
			type = "BDL"
		}
	}

	component = org.eclipse.xpand2.Generator {
		metaModel = org.eclipse.xtend.typesystem.emf.EmfMetaModel {
			metaModelPackage = "org.xtext.example.mydsl.MyDslAPackage"
		}
		
		metaModel = org.eclipse.xtend.typesystem.emf.EmfMetaModel {
			metaModelPackage = "org.xtext.example.mydsl.MyDslBPackage"
		}
		
		expand = "templates::Template::main FOREACH greetings"
		
		outlet = {
			path = targetDir
		}
		fileEncoding = fileEncoding
	}
}

Now I have problem with the generator. The error that appears is as follows
Could not find any exported element of type 'BDL' -> Slot 'system' is empty.
My question is what is a slot actually?

Nikola

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #670356 is a reply to message #670354]

Fri, 13 May 2011 11:54

Eclipse User

hi,

yes you have to add

	bean = StandaloneSetup {
		platformUri=".."
	}

if you use platform:/resource imports

a slot is just an entry in a map

load = {
			slot = "system"
			type = "BDL"
		}

stores all BDL to the map under the key system

and

templates::Template::main FOREACH greetings

call the min definition foreach of the entries of the slot greetings

and yes by default only stuff that has a name is exported/stored to the slot by this generator workflow.
(and stored to the slot)

~Christian

[Updated on: Fri, 13 May 2011 12:30] by Moderator

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671042 is a reply to message #670356]

Mon, 16 May 2011 11:39

Eclipse User

Hi Christian
me again ... Very Happy

The problems with the generation of text with templates are resolved !
I'm creating standalone java application in which I would like to read a model and to parse it. It works OK, BUTTTT when it comes to reading the cross references, the type of the cross reference is ok, but the name (taken with getName()) of the referenced object from the imported referenced model is null.
What I do in the code is the following: I invoke setups of both the base language and the new one that uses the base language for cross references.

BaseStandaloneSetup.doSetup();
BdlStandaloneSetup.doSetup();

Any suggestions?
Nikola

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671044 is a reply to message #671042]

Mon, 16 May 2011 11:43

Eclipse User

Hi,

can you give me some reproducable code?

~Christian

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671048 is a reply to message #671044]

Mon, 16 May 2011 11:49

Eclipse User

You want the java code of the script only or everything ? I can send you the java code ?? :-/
Nikola

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671051 is a reply to message #671048]

Mon, 16 May 2011 11:51

Eclipse User

Hi,

no the two grammars
+ the language generator workflows
+ the generator workflow
+ 2 sample models incl folder structure

are fine Wink

~Christian

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671052 is a reply to message #671051]

Mon, 16 May 2011 11:56

Eclipse User

Unfortunately I cannot send you Sad

company secret
Maybe I have to reproduce the entire case with two dummy grammars and then ask you again...
Life it's not easy at all Very Happy

Thanks however
I'll write when I'll repeat the case.
Nikola

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671058 is a reply to message #671052]

Mon, 16 May 2011 12:11

Eclipse User

Hi

Of cource i am fine with dummy / sample dsls Wink

~Christian

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671329 is a reply to message #671058]

Tue, 17 May 2011 10:34

Eclipse User

Hi Christian

I've reproduced the code. So, again I cannot access the referenced objects. BTW it works fine with xPand but I cannot figure out what is the problem when I want to use the parser in a standalone application.
That's why I made two grammars: libraryBuilding as a base one and libExt that is using libraryBuilding.
The standalone application is contained in the project parseLibExt.
So the output is

A
null

and it should be

A
Tower

I hope this all u need?

Thanks again
Nikola

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Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671364 is a reply to message #671329]

Tue, 17 May 2011 12:02

Eclipse User

Hi,

you have to do the same as you do in the workflow Wink

new StandaloneSetup().setPlatformUri("..");

~Christian

Re: Configuring mwe2 file of Xpand .generator project when having imported metamodel in Xtext [message #671535 is a reply to message #671364]

Wed, 18 May 2011 04:55

Eclipse User

Thanks Christian, that solved my problem ! Very Happy

Now it will be easy to proceed with the rest of the work.
Thanks again !
Nikola

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