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Xtext: Cannot resolve reference [message #1791041]

Thu, 21 June 2018 20:56

Rémi Bernard

Messages: 2
Registered: June 2018

Junior Member

Hi!

This is my first attempt at Xtext.
Here is the grammar I built:

    grammar com.x.x.x.XxxDsl with org.eclipse.xtext.common.Terminals
    generate xxxDsl "...www.x.x.x.com/xxx/xtext/XxxDsl"

    Root:
        catalogs+=Catalog*
        instances+=Instance*
        ;

    Catalog returns Catalog:
        'Catalog' name=ID
        '{'
        models+=Model*
        '}'
        ;
    
    Model returns Model:
        'Model' name=ID
        ;
    
    Instance returns Instance:
        'Instance'
        name=ID
        'of'
        model=[Model]
    ;

And here is my text:

    Catalog myCatalog
    {
        Model meteo
    	Model storm
    }

    Instance wintermeteo of meteo
    Instance strongstorm of storm

The 2 last lines are in error, `meteo` and `storm` being marked with:

    Couldn't resolve reference to Model 'meteo'/'storm'

If I change my grammar so that the Models are directly in Root (and not inside Catalogs anymore) and update the text accordingly, then the models are correctly recognized.

What did I do wrong? Thanks

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Re: Xtext: Cannot resolve reference [message #1791568 is a reply to message #1791041]

Mon, 02 July 2018 14:55

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Xtext builds hierarchical names

myCatalog.meteo
and
myCatalog.storm

either change grammar to model=[Model|FQN] with FQN: ID ("." ID)*;
and reference by fqn Instance

strongstorm of myCatalog.storm

or bind SimpleNameProvider as IQualifedNameProvider or customize
DefaultDeclarativeQualifiedNameProvider to provide simple instead of a qualifed name

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

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