[antlr-interest] About tree duplication ?

[Mathieu Clabaut]

 Hello,

  In a tree parser, I can not reference twice the same tree when
constructing a new tree. I have to call astFactory->create().
  Is there a way to only use antlr notation ? Is this a feature or a bug ?

 For example, the following creation rules
  	    ##= #([OR_SERVICE,"||"],
		     #([TWOWAY,"<>"],#s3,
			#([SOURCE,":<"], #f3),
			#([DESTINATION,":>"],#t3)
		     ),
		     #([TWOWAY,"<>"],#s3,
			#([SOURCE,":<"], #t3),
			#([DESTINATION,":>"],#f3)
		     )
gives the following tree :
||
 <>
  s3 :<f3 :> t3 :<t3 :>f3
 <>
  s3 :<f3 :> t3 :<t3 :>f3

Whereas the following creation rules:
	    ##= #([OR_SERVICE,"||"],
		     #([TWOWAY,"<>"],#s3,
			#([TWOCOLON,"::"] , #b3),
			#([SOURCE,":<"], #f3),
			#([DESTINATION,":>"],#t3)
		     ),
		     #([TWOWAY,"<>"],astFactory->create(#s3),
			#([TWOCOLON,"::"] , #b3),
			#([SOURCE,":<"], #t3),
			#([DESTINATION,":>"],#f3)
		     )
Gives the expected results :
||
 <>
  s3 :<f3 :> t3
 <>
  s3 :<t3 :>f3

-mathieu

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Mathieu CLABAUT                         mailto:mathieu.clabaut at gmail.com
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