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[Xtext2] Extending Xbase expressions [message #663678]

Wed, 06 April 2011 07:39

Ingo Meyer

Messages: 162
Registered: July 2009

Senior Member

Hello,

today I started to "play" with Xtext 2.
Seems to be very very good.

My first try is to extend xBase by adding own literals and functions.
But I absolutely have no idea cause I immediately get

"Cannot add supertype 'xxx' to sealed type 'XExpression'."

whenever I try to override something.

Can somebody please give me a hint how to start.

I tried something like:

XDecimalLiteral returns XExpression :
	{XDecimalLiteral} value=DECIMAL;

and I want to integrate that:

XLiteral:
	XClosure |
	XBooleanLiteral |
	XIntLiteral |
	XDecimalLiteral |
	XNullLiteral |
	XStringLiteral |
	XTypeLiteral
;

but got "Cannot add supertype 'XLiteral' to sealed type 'XExpression'."

[Updated on: Wed, 06 April 2011 07:40]

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Re: [Xtext2] Extending Xbase expressions [message #663699 is a reply to message #663678]

Wed, 06 April 2011 09:02

Sven Efftinge

Messages: 1823
Registered: July 2009

Senior Member

Please note, that the Xtext newsgroup is eclipse.modeling.tmf.

Am 4/6/11 9:39 AM, schrieb Ingo Meyer:
>
> XLiteral:
> XClosure |
> XBooleanLiteral |
> XIntLiteral |
> XDecimalLiteral |
> XNullLiteral |
> XStringLiteral |
> XTypeLiteral
> ;
>
>
> but got "Cannot add supertype 'XLiteral' to sealed type 'XExpression'."

You need to explicitly declare the return type:

XLiteral returns XExpression :
...
;

--
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