Eclipse Community Forums: TMF (Xtext)

Help

Home

Home » Modeling » TMF (Xtext) » Datatype rules(How datatype rules handle varied types)

Show: Today's Messages :: Show Polls :: Message Navigator

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

Report message to a moderator

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

Mon, 01 August 2011 19:45

Christian Dietrich

Messages: 14665
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

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

Report message to a moderator

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

Report message to a moderator

Previous Topic:	How can I allow any character for a particular type
Next Topic:	Content Assist error

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Sat Apr 20 05:22:46 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter