[antlr-interest] TreeWalker and AST Transformation

[Jens Bräuer]

Dear Loring, Dear Antlr-Intrest

thanks a lot for your answer. Seems as i made a mistake when writing the
mail.
In contrast to what i wrote, the problem is, that before transformation
a _StepletBody_ has multiple StreamStatements as children. Only the
first child (aka StreamStatement) survives a walk with the TreeWalker.
Antlr version is 2.7.7.

>> pr_StepletBody
>> 	:
>> 	#(StepletBody (pr_StreamStatement)*)
>> 	;
>>
>> pr_StreamStatement
>> 	{ StringBuffer s;}
>> 	:
>> 	#(StreamStatement
>> 		(
>> 			pr_SimpleStreamStatement
>> 			| pr_MultiStreamStatement
>> 			| pr_TimeStreamStatement
>> 			| pr_StreamStatmntWithDefault
>> 			| pr_StepletInvokation
>>
>> 		)
>> 	)
>> 	;

Any hints ?

Greetings, Jens


Loring Craymer wrote:
> Jens--
> 
> The problem is that you are only looking for a single
> child; change the child subgroup to a closure
> 
> pr_StreamStatement
>  	{ StringBuffer s;}
>  	:
>  	#(StreamStatement
>  		(
>  			pr_SimpleStreamStatement
>  			| pr_MultiStreamStatement
>  			| pr_TimeStreamStatement
>  			| pr_StreamStatmntWithDefault
>  			| pr_StepletInvokation
>  
>  		)+   // CHANGED from ) to )+
>  	)
>  	;
> 
> and everything should work.
> 
> --Loring
> 
> 
> --- Jens Braeuer <mailists at gmx.net> wrote:
> 
>> Dear TreeTransformation-Experts,
>>
>> i've got a problem transforming an AST using a
>> TreeWalker, which i was
>> unable to solve using google, antlr-doc and the
>> mailinglist archive. :-)
>>
>> I currently work on a small code generation project,
>> which involves
>> TreeWalkers to modify a AST (so buildAST is true).
>>
>> The problem is, that _before_ using the TreeParser a
>> StreamStatement has
>> _multiple_ children whereas after using the
>> TreeParser only the first
>> child survives. I used included ASTFrame to look at
>> the results.
>>
>> Any hints on how i have to modify the grammar so all
>> children are included
>> in the output-tree ?
>>
>>
>> TreeWalker grammar snipet:
>> -----
>> pr_StepletBody
>> 	:
>> 	#(StepletBody (pr_StreamStatement)*)
>> 	;
>>
>> pr_StreamStatement
>> 	{ StringBuffer s;}
>> 	:
>> 	#(StreamStatement
>> 		(
>> 			pr_SimpleStreamStatement
>> 			| pr_MultiStreamStatement
>> 			| pr_TimeStreamStatement
>> 			| pr_StreamStatmntWithDefault
>> 			| pr_StepletInvokation
>>
>> 		)
>> 	)
>> 	;
>> ---------
>>
>>
>> Greetings, Jens Braeuer
>>
>>
>>
>>
>>
> 
> 
> 
> 
>  
> ____________________________________________________________________________________
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