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Xtext Enums [message #1385207]

Thu, 05 June 2014 01:49

Fernando Costa

Messages: 5
Registered: June 2014
Location: Brazil

Junior Member

The Xtext documentation states the Ecore meta model doesn't support unset Enums. So if you type a rule like

Element: "element" name=ID (value=SomeEnum)?;

And try to process the input

element foo

The feature named 'value' will store '0'

As a workaround it suggests to use a dedicated none-value or order the enums accordingly. I didn't understand. Anyone could give me examples of how to apply such workarounds.

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Re: Xtext Enums [message #1385229 is a reply to message #1385207]

Thu, 05 June 2014 05:28

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Somerule: someattr=MyEnum;

enum MyEnum returns MyEnumWithDefault:
a | b;

enum MyEnumWithDefault:
undefined | a | b;

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

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Re: Xtext Enums [message #1385283 is a reply to message #1385229]

Thu, 05 June 2014 11:36

Fernando Costa

Messages: 5
Registered: June 2014
Location: Brazil

Junior Member

Thanks Dietrich

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