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Xtext grammar which do not generate an EMF java interface [message #1784472]

Wed, 28 March 2018 11:17

Thanh Huynh

Messages: 3
Registered: March 2018

Junior Member

I had a given grammar in Xtext, the rules is defined as following:

TExpression:
PARENTHESIS_OPEN TypeE PARENTHESIS_CLOSE | EXCLAMATION TExpression| TypeA| TypeB | TypeC |
TypeD;
PARENTHESIS_OPEN:
'(';

PARENTHESIS_CLOSE:
')';
EXCLAMATION:
'!';

When I generate the EMF metamodel for this grammar specification, I only have the java interface for TExpression rule.

So how can I make the distinction in my generator that I am working with 'TExpression' object or ' EXCLAMATION TExpression' object?

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Re: Xtext grammar which do not generate an EMF java interface [message #1784479 is a reply to message #1784472]

Wed, 28 March 2018 13:36

Christian Dietrich

Messages: 12390
Registered: July 2009

Senior Member

EXCLAMATION:
{EXCLAMATION}'!';

p.s: please use assignments in your grammar.

Need professional support for Xtext, Xpand, EMF?
Go to: https://xtext.itemis.com
Twitter : @chrdietrich
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[Updated on: Wed, 28 March 2018 13:37]

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Re: Xtext grammar which do not generate an EMF java interface [message #1784537 is a reply to message #1784479]

Thu, 29 March 2018 07:31

Thanh Huynh

Messages: 3
Registered: March 2018

Junior Member

Hi Christian,

It's not work in the way you mentioned. I got this following error at the definition of TExpression

Quote:

Multiple markers at this line
- An unassigned rule call is not allowed, when the 'current'
was already created.
- Cannot change type twice within a rule

Do you have any idea on how to fix it?

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