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Deafult value for enums [message #1722028]

Tue, 02 February 2016 05:58

Eclipse User

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

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

Tue, 02 February 2016 06:00

Eclipse User

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.

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

Tue, 02 February 2016 06:40

Eclipse User

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

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

Tue, 02 February 2016 07:10

Eclipse User

yes you can use ecore unsettable eIsSet/eIsAttributeSet for that

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