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Creating common interface [message #842994]

Thu, 12 April 2012 18:53

Andrew Gacek

Messages: 32
Registered: October 2011

Member

I have an expression language that has both field and array access:

Index returns Expr:
  Atom ({FieldIndex.base=current} '.' field=ID |
        {ArrayIndex.base=current} '[' index=INT ']')*
;

This generates interfaces FieldIndex and ArrayIndex, both extending Expr, which have their own versions of set/getBase(). I am trying to find a way to get Xtext to generate an intermediate interface Index which extends Expr and contains set/getBase() and such that FieldIndex and ArrayIndex both extend Index. So far the best solution I've found is the following two fake productions:

Fake1 returns Expr: {Index} base=Expr;
Fake2 returns Index: {FieldIndex} | {ArrayIndex};

Is there a better way to do this?

Thanks,
Andrew

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Re: Creating common interface [message #843117 is a reply to message #842994]

Thu, 12 April 2012 19:33

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Guess it is time to switch to a manually maintained metamodel

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

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