[antlr-interest] Re: getFirstChild vs getNextSibling ?

[Terence Parr]

Hi gang,

Imagine tree

A
|
|
B -- C

getFirstChild of A is B, of B is null, of C is null.
getNextSibling of A is null, of B is C, of C is null.

Terence

On Saturday, May 3, 2003, at 08:38  AM, jw9315 wrote:

> Hi,
> so what type of tree structures have a nextSibling()of null, because
> I can always get the firstChild, but calls to getNextSibling always
> return null?
> Thanks,
> Jon
>
> of null
>
> --- In antlr-interest at yahoogroups.com, ow <oneway_111 at y...> wrote:
>> --- jw9315 <jw9315 at b...> wrote:
>>> Hi,
>>> I writing a very simple interpreter using an AST tree. I know
> this is
>>>
>>> probably a trivial question, but what is the difference between
> the
>>> calls astTree.getFirstChild() vs astTree.getNextSibling()? Could
>>> anyone give me a short example, it would be much appreciated!
>>> Thanks,
>>> Jon
>>
>> The way I see it:
>>
>> AST parent
>>         +
>>         |
>>         |--- firstChild = parent.getFirstChild()
>>         |
>>         |--- nextSibling = firstChild.getNextSibling()
>>
>>
>>
>>
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