[antlr-interest] Re: Antlr v3 & Trees
John D. Mitchell
johnm-antlr at non.net
Thu Apr 22 22:12:59 PDT 2004
Sorry for responding to Ter's reply to you but I don't seem to have
received your message.
>>>>> "Terence" == Terence Parr <parrt at cs.usfca.edu> writes:
>>>>>> On Apr 22, 2004, at 1:48 PM, Monty Zukowski writes:
>> On Apr 22, 2004, at 1:23 PM, John D. Mitchell writes:
[...]
>>> I'm perplexed. Do you have some example where the addition of an
>>> imaginary node is some kind of problem? The only examples that I can
>>> think of would all be issues of a very poorly designed tree to begin
>>> with.
>> Consider the following tree grammar fragment:
>> Example A:
>> selectStatement : queryExpression (computeClause)? (forClause)?
>> (optionClause)?
>> ;
>> computeClause : #(COMPUTE (identifier expression)+ (BY (expression)+)?
>> )
>> ;
That's okay but I don't see how that's an example where using imaginary
nodes instead would *create* a problem.
Thanks,
John
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