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Implementing infix dot operator [message #667891]

Mon, 02 May 2011 15:50

Rafael Angarita

Messages: 94
Registered: November 2010

Member

Hello everybody,

I have to implement the infix dot operator to access inner members of objects. For example, I have this grammar:

Domain:
	'Name:' name=ID
	 numericEnumeratedValues=NumericEnumeratedValues
;

NumericEnumeratedValues :
	('Values:' '{' enumeratedvalues+=NumericEnumeratedValue (',' enumeratedvalues+=NumericEnumeratedValue)* '}')
;

NumericEnumeratedValue :
	value=NUMBER name=ID
;

, so I could write something like:

Name: testDomain
Values: {
          0 MyTrueValue
          1 MyFalseValue
}

Now I would like to access any of those values from different objects:

      testDomain.MyTrueValue

For now, is it not really important if the possible values (MyTrueValue and MyFalseValue) are shown automatically after writing the dot. I can work with the Ctrl-space autocompletion.

I was thinking of writing something like:

ConstantReference :
	DomainReference ({Point.left = current} '.' right=ValueReference)	
;

DomainReference:
	dom=[domainRef::Domain]
;

ValueReference:
	val=[ecore::EObject]  //I dont know what to write here
;

and somehow filter the content shown at the right side of the dot operator, but first, I think the NumericEnumeratedValue of the Domain is not being exported, even though it has a name feature, and second if they were exportend and shown in the ValueReference, I would be able to get and filter by NumericEnumeratedValue type, but I will need to get only the NumericEnumeratedValue belonging to the Domain I wrote at the right side of the dot operator and I don't know how to do it.

I think I maybe going on the wrong path here.

Any advise?

Thank you very much for your help.

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