[antlr-interest] Removing nil nodes from tree

[Eric]

Hi Todd,

If you can make either all or enough of the code available to recreate the
problem, including the driver I will see if I can prune out the nil nodes
for using API calls. I can't promise an answer only help.

Eric

On Sat, Mar 17, 2012 at 1:13 PM, Todd Nine <tnine at apigee.com> wrote:

> Hi Eric,
>   Mostly a problem. They are remnants from the grammar tree where operator
> precedence has occurred.  Or->and->not->equality operand.
>
> I've subclassed CommonTree for my nodes, and I'm using the visitor pattern
> to walk the AST and perform the logic to query our Cassandra indexes and
> return results.  With the nil nodes present, I have to create my own
> CommonTreeAdapter as well as a nil class for visitor implementation and
> traversal. If I can just remove them via an option, I won't have to add
> this extra code.
>
> Thanks again for all the help!
>
> Todd
>
> On Mar 17, 2012, at 7:48 AM, Eric <researcher0x00 at gmail.com> wrote:
>
> Hi Todd,
>
> Are the nil nodes causing you a problem or are they just astetically
> unpleasing?
>
> Eric
>
> On Sat, Mar 17, 2012 at 1:38 AM, Todd Nine <tnine at apigee.com> wrote:
>
>> Hi all,
>>  I now have my AST generating node classes for my tree.  However, I have
>> one final issue.  nil nodes are included in my tree after parsing is
>> complete.  They appear in trees due to operator precedence.  Is it
>> possible
>> to remove nil nodes as the tree is generated?
>>
>> Thanks,
>> Todd
>>
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>
>