[antlr-interest] rewrite rule translation to tree grammar

[Johannes Luber]

Terence Parr schrieb:
> hi. that seems incorrect to me.  You can't have a tree as a root node. 
> Imagine creating $qualified_identifier as tree in first subrule then
> making root in (...)*.  Probably not right.
> Ter

Having thought about your answer, it explains one of my difficulties. I
tried to mimic the following example:

expr : (INT -> INT) ('+' i=INT -> ^('+' $expr $i) )* ;

The solution seems to be that I need an equivalent for the '+'. But my
rule doesn't have a token which could be the overall root. What do you
suggest? And what would be the tree grammar equivalent?

Johannes

> On Dec 14, 2007, at 12:24 PM, Johannes Luber wrote:
> 
>> Hi,
>>
>> I have the following rule:
>>
>> qualified_identifier
>>   :   (i1=IDENTIFIER -> ^(QUALIFIED_IDENTIFIER $i1))
>>       (DOT i2=IDENTIFIER -> ^($qualified_identifier DOT $i2))*
>>   ;
>>
>> But I haven't found an example in TDAR which explains the equivalent
>> rule for a tree grammar. Can someone help?
>>
>> Johannes
>