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Validation of non-null enum rule [message #1706866]

Mon, 31 August 2015 14:19

Moshe Maizels

Messages: 20
Registered: August 2015

Junior Member

Hi,
I have a Grammar which includes an enum zero-based value, which i want to validate for non-null.

Lets say my grammar has rules like:

Parent:
'parent' name=ID '{'
'period-age' period=Period
'age' age=INT
'}'

enum Period:
FIRST='1Part' | SECOND='2Part' | LAST='3Part';

I Want to validate if i don't receive the enum-value (Period), which means it is null.
How can i do it?

Note: This is important because I also have rules which the enum-based value is optional (and will then pass the parser but i will want to check them in the validation step)

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