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

Mon, 23 January 2012 13:05

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 13:49

Christian Dietrich

Messages: 14113
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

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/it-services/methods-and-tools/xtext
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Blog : https://www.dietrich-it.de

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

Mon, 23 January 2012 14:17

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 15:29

Sven Efftinge

Messages: 1823
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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Twitter : @svenefftinge
Blog : http://blog.efftinge.de

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