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Datatype rules [message #707536]

Mon, 01 August 2011 19:38

sungam

Messages: 21
Registered: March 2010

Junior Member

I have a grammar like:

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

import "http://www.eclipse.org/emf/2002/Ecore" as ecore

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
greetings+=Greeting*;

Greeting:
'Hello' name=ID '!'
'Person:'value=ConstantValue;

ConstantValue:
value=(BooleanType | NullObjectType );

NullObjectType returns ecore::EJavaObject:
NULL_CONSTANT;

BooleanType returns ecore::EBoolean:
BOOLEAN_CONSTANT;

terminal BOOLEAN_CONSTANT returns ecore::EBoolean:
'true' | 'false';

terminal NULL_CONSTANT:
'null';

----------------

The above grammar shows errors, at the rule ConstantValue.

Seems like this could be because of the individual data type rules used within, each of which return different types.

Could someone advice how this can be handled in xtext2.0?

Thanks

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Re: Datatype rules [message #707539 is a reply to message #707536]

Mon, 01 August 2011 19:45

Christian Dietrich

Messages: 13882
Registered: July 2009

Senior Member

Hi,

there is not type the value can be of => you have to split the constant up

ConstantValue: BooleanValue | NullValue;

BooleanValue: value=BooleanType;

NullValue: value=NullObjectType;

~Christian

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/it-services/methods-and-tools/xtext
Twitter : @chrdietrich
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Re: Datatype rules [message #707544 is a reply to message #707539]

Mon, 01 August 2011 19:52

sungam

Messages: 21
Registered: March 2010

Junior Member

Wonderful, that worked.
Thanks

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