Xtend model data access from top level (Code generation)

Question

If I have an Xtext grammar like the one below:

grammar org.xtext.example.mydsl.ServerGeneratorLanguage with org.eclipse.xtext.common.Terminals

generate serverGeneratorLanguage "http://www.xtext.org/example/mydsl/ServerGeneratorLanguage"

Model:
  (types+=Type)*;

Type:
  Server | DomainModel;

Server:
    "SERVER" name=ID "{"
        "CONFIG" "{"
        (Configs+=Config)*
            "}"
  "}";

Config:
    rootConfig | hostNameConfig | portConfig | logConfig | sqldbConfig | resourceConfig;

rootConfig:
    "ROOTDIR" "=" name=ID;

hostNameConfig:
    "HOSTNAME" "=" name=ID;

portConfig:
    "PORT" "=" name=ID;

logConfig:
    "LOG" "=" name=ID;

sqldbConfig:
    "SQLDB" "=" name=ID;

resourceConfig:
    "RESOURCE" "=" name=ID;

DomainModel:
    "DOMAINMODEL" name=ID "{"
        "ENTITYS" "{"
            (Entitys+=Entity)*
        "}"
        "ENTITY_RELATIONSHIP" "{"
            (Relationships+=Relationship)*
        "}" 
    "}";

Entity:
    name=ID "{"
        (Attributes+=Attribute)*
    "}";

Attribute:
    StringAttribute | NumberAttribute | ImageAttribute;

StringAttribute:
    "STRING" name=ID;

NumberAttribute:
    "NUMBER" name=ID;

ImageAttribute:
    "IMAGE" name=ID;

QualifiedName:
    ID ('.' ID)*;

Relationship:
    name=[Attribute|QualifiedName] "->" refName=[Attribute|QualifiedName];

How do I access the name-ID part of each Config object from a higher level than Server. Let me explain:

I want to generate code by collecting data from Server.configs.eClass.name AS WELL AS DomainModel.blahblah.eClass.name. I assume I need to access it from Type, but I can't seem to get there in Xtend.

From Server I can access all the components Server.configs.eClass.name.

Thank you for the help.

score 0 · Answer 1 · answered Mar 22 '13 at 07:41

0

The automatic model inferrer of Xtext should push common features (like 'name' in your case) up the inheritance hierarchy. When it does not do this, you should check:

Does each Config have a name feature? Are they the same type? Check this in your grammar.
Do RootConfig, HostConfig etc. derive from Config? Check this in the generated classes.

answered Mar 22 '13 at 07:41

A.H.

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I am a little lost with your question, does my code not answer that? I have included a name at the end of each tree. eg 'Config -> rootConfig -> name' as you can see above. But I do not know how to access it from such a high level (Type). I only know how to access is from a close level. (Config) – Charles Henry Mar 25 '13 at 15:05
I would not have asked if it would be clear from your code. Your code is not self contained. And my "question" is: Does each grammar rule "below" `Type` have a `name=ID` part? I assume, that you forgot at least one somewhere in some part of the grammar you did not post here. – A.H. Mar 25 '13 at 18:49
Ok I have added all of the code above, I have included name=ID for every grammar. What do you think the problem may be? It would be so helpful if I could get this working... – Charles Henry Apr 23 '13 at 12:49
@CharlesHenry I don't understand your problem: If I paste your grammar into an Xtext file and generate the artefacts, then the comman supertype of `DomainModel` and `Server` is `Type`. And `Type` has a `name` attribute. So in Xtend you can just use `val Type myType = ...; myType.name`. Exactly what you've asked for at the beginning. – A.H. Apr 23 '13 at 17:45

Xtend model data access from top level (Code generation)

1 Answers1