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Duplicate references in Xtext Editor [message #1098009]

Fri, 30 August 2013 13:17

Arshad Adavani

Messages: 163
Registered: July 2013
Location: Bangalore

Senior Member

Hi all,
My grammar looks something like this:

ComponentA:
"compoA" name=ID '{'
"description" Description=STRING
}

ComponentB:
"compoB" name=ID '{'
"refers" "[" (components+=[ComponentA] ("," components+=[ComponentA])*)? "]"
'}'
;

So some of the valid examples are:

compoA name1 { description "description" }
compoA name2 { description "description" }
compoA name3 { description "description" }

AND:
compoB name1B { refers [name1,name2] }
compoB name2B { refers [name1,name1] }
compoB name3B { refers [name1,name1,name1] }

As you can see duplicate references to name1 is allowed in last two examples.
Can I avoid it ? Or Validator is the ONLY way to display an error ??

Arshad

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Re: Duplicate references in Xtext Editor [message #1098028 is a reply to message #1098009]

Fri, 30 August 2013 13:54

Ian McDevitt

Messages: 70
Registered: December 2012
Location: Belfast

Member

Duplicate references are normally ok in most languages except in certain language-specific contexts which is why you'll need a context sensitive check, which would be in the validator where you can give a helpful message plus possible quick fixes.

The alternative of trying to prevent it without context through syntax (if even possible) would not have this so you'd need a very good reason to try it another way.

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