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[xtend] Casting to Subclass in Template [message #782282]

Mon, 23 January 2012 08:05

Sebastian Burg
Messages: 9
Registered: November 2011

Junior Member

I have a XText Grammar, which shall be used to fill out a template.

In this Grammar i have a type

VI:
	'{' (vus+=VU)+ '}'
;

VU_unit:
			Ref|Prop
;
Ref: 
	'var' variable=ID 
;

Prop:
	'prop' verif=VD
;

I walk through the given "VU"'s, and can react if something is a Ref or a Prop, but i can't seem to find a way to access the parts variable or respectively verif.

with given p

''' 		
«FOR st:p.VI.VU_unit»
«IF st instanceof Ref»			
WHAT TO DO HERE TO WRITE Ref.variable?

«ENDIF»
«ENDFOR»
'''

I cant find a way how to do it.... Please help. Thanks

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Re: [xtend] Casting to Subclass in Template [message #782305 is a reply to message #782282]

Mon, 23 January 2012 08:49

Christian Dietrich
Messages: 4407
Registered: July 2009

Senior Member

Hi you can cast with

myvar as My type

But you should consider to solve this with dispatch methods instead
of doing instance of checks and typecasts. Regards Christian

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Re: [xtend] Casting to Subclass in Template [message #782314 is a reply to message #782305]

Mon, 23 January 2012 09:17

Sebastian Burg
Messages: 9
Registered: November 2011

Junior Member

Thanks. That works for me.

But i still wonder why i couldn't find this...

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Re: [xtend] Casting to Subclass in Template [message #784474 is a reply to message #782314]

Fri, 27 January 2012 10:29

Sven Efftinge
Messages: 1667
Registered: July 2009

Senior Member

It's explained here :
http://www.eclipse.org/Xtext/xtend/documentation/index.html#typeCasts

Am 1/23/12 3:17 PM, schrieb Sebastian Burg:
> Thanks. That works for me.
> But i still wonder why i couldn't find this...

--
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--
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Go to: http://xtext.itemis.com
Twitter : @svenefftinge
Blog : blog.efftinge.de

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