[antlr-interest] Re: Building trees with the correct associativity

[Monty Zukowski]

On Dec 1, 2004, at 7:00 PM, Paul J. Lucas wrote:

>> Out of curiosity, why are you avoiding the more compact
>>
>> addExpr
>>     :
>>     mulExpr (addOp^ mulExpr)*
>>     ;
>>
>> The binary trees avoid inserting the extra node.
>
> 	Because that's illegal syntax in ANTLR 2.7.x.  addOp is not a
> 	token.  But this is orthoganal to the problem at hand.
>

Well, at least that one is easy:

addExpr
	:
	mulExpr ( (PLUS^ | MINUS^) mulExpr)*
	;

Monty



 
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