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Deafult value for enums [message #1722028]

Tue, 02 February 2016 10:58

Arshad Adavani

Messages: 163
Registered: July 2013
Location: Bangalore

Senior Member

Hi All,
I have a clarification related to enums.
Always first enum value is set by default. For E.g.

enum MyEnum :
val1 | val2 ;

If some value is not set in the editor, by default it takes as val1. How do we avoid this ? Can we do something in the grammar?

Thanks in advance Smile

Regards,
Arshad

Arshad

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Re: Deafult value for enums [message #1722029 is a reply to message #1722028]

Tue, 02 February 2016 11:00

Miro Spönemann

Messages: 74
Registered: March 2015
Location: Kiel, Germany

Member

You have to define the enum type in an ecore model and import that in your language. In that external model you can declare a default enum literal and omit that one in the grammar rule for the enum type so it's not part of the syntax.

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Re: Deafult value for enums [message #1722034 is a reply to message #1722029]

Tue, 02 February 2016 11:40

Arshad Adavani

Messages: 163
Registered: July 2013
Location: Bangalore

Senior Member

Hi Miro,

Thanks for the reply.

But now say that, if that enum field is optional in my grammar then it will still consider the first element .. So we will have to check explicitly if it's set or not..

Regards,
Arshad

Arshad

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Re: Deafult value for enums [message #1722040 is a reply to message #1722034]

Tue, 02 February 2016 12:10

Christian Dietrich

Messages: 14060
Registered: July 2009

Senior Member

yes you can use ecore unsettable eIsSet/eIsAttributeSet for that

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