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Cross Reference without additional feature [message #1761176]

Mon, 08 May 2017 15:11

Messages: 23
Registered: September 2015

Junior Member

Hi, I tried to look for answers on the forum on my own, but didn't find what I've looked for - please don't kill me if the question has been already answered.

I have defined following:

AttributeGroup:
( doc = COMMENT )?
'group' name = ID
'from' mainObject = [ Class | QualifiedName ]
'select' attributes += AbstractAttribute (',' attributes += AbstractAttribute)*;
now I define a reference:

AttributeGroupReference:
group = [AttributeGroup]
;
this is all well, but what I would actually want to do would be to refer the "attributes" feature of the AttributeGroup in moe or less following fashion:

AttributeGroupReference:
group = [AttributeGroup]
attributes = group.attributes;
;
the idea is that I would then be able to access the attributes directly from the AttributeGroupReference (I don't really need the AttributeGroup itself even).

Originally I've posted it on stack overflow (if somebody want's to get some fame ...):
http://stackoverflow.com/questions/43810119/xtext-cross-reference-of-a-feature-of-a-reference

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Re: Cross Reference without additional feature [message #1761182 is a reply to message #1761176]

Mon, 08 May 2017 15:35

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi I don't understand you question.

What about sharing sample models as well

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

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Re: Cross Reference without additional feature [message #1761186 is a reply to message #1761182]

Mon, 08 May 2017 16:25

Messages: 23
Registered: September 2015

Junior Member

Sorry - don't understand what the sample models are Smile

- I'm using xtext as a parser and I'm working on the grammar - the only model I know of is created at runtime when I parse the file with my grammar and I suppose it's not the thing you want from me.

Essentially what I want to do is to make a feature that can be fed either by direct definition of a type or by a cross reference to the type defined elsewhere - or to somehow make in one type a cross reference and then to assig a feature from this reference to a feature in my type .

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Re: Cross Reference without additional feature [message #1761187 is a reply to message #1761186]

Mon, 08 May 2017 16:34

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

yes and in your question you mix grammar and concrete syntax.

so please:

how shall the file look like that the user models
and where shall be the cross references
and where should they point to

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

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Re: Cross Reference without additional feature [message #1761216 is a reply to message #1761176]

Tue, 09 May 2017 06:21

Karsten Thoms

Messages: 762
Registered: July 2009
Location: Dortmund, Germany

Senior Member

I also don't completely get what you mean. I could imagine that you mean that you want to refer to a list of attributes.

Quote:

AttributeGroupReference:
attributes += [AbstractAttribute|QualifiedName]+

;

This would allow to list a set of attributes with their qualified name, which are prefixed with the AttributeGroup's name. Should work out of the box.

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Re: Cross Reference without additional feature [message #1761316 is a reply to message #1761216]

Tue, 09 May 2017 16:06

Messages: 23
Registered: September 2015

Junior Member

This would be almost what I need - except is that I want to define this list of attributes in a different place (the AttributeGroup) and be able to use the whole list, not the attributes in the list one by one.

so I have the "AttributeGroup" that has the list of "AbstractAttribute" named "attributes"
and I want the "AttributeGroupReference" to also have the list of "AbstractAttribute" named "attributes" but the contents of this list to be taken from the referenced "AttributeGroup"

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Re: Cross Reference without additional feature [message #1761335 is a reply to message #1761316]

Tue, 09 May 2017 18:35

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

that do you mean by use?

cant you simply follow the reference?

e.g.

doSomeThingWith(AttributeGroupReference ref) {
ref.getGroup().getAttributes()
}

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

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Re: Cross Reference without additional feature [message #1761346 is a reply to message #1761316]

Wed, 10 May 2017 06:09

Karsten Thoms

Messages: 762
Registered: July 2009
Location: Dortmund, Germany

Senior Member

I think Christian is right. Since you don't want to list the attributes in the concrete syntax model, you just need to name the AttributeGroup for a cross reference. To get the group's attributes list, just evaluate the collection in the AST.

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