Re: [Boost-users] [Spirit] xml parse tree printing double leaf node

On Sat, Oct 31, 2009 at 12:29 PM, HT4N - wrote:

When I generating parse tree and dump it using the built-in tree-to-xml function, even from a simple grammar, I wonder why it prints out the leaf node twice.

For instance:

Parameter = ParameterName >> ParameterValue;

The tree it prints it looks more or less like the following (note the repetition of ParameterName and ParameterValue nodes):

<Parameter>      <ParameterName>             <ParameterName>                     <value>Foo</value>             </ParameterName>      </ParameterName>      </ParameterValue>             <ParameterValue>                     <value>Bar</value>             </ParameterValue>      </ParameterValue> </Parameter>

I would be expecting more something like:

<Parameter>      <ParameterName>            <value>Foo</value>      </ParameterName>      </ParameterValue>            <value>Bar</value>      </ParameterValue> </Parameter>

Is there any directive or secret that I don't know ?

Probably because of the rule indirection. You *really* should be using Spirit.QI, not Spirit.Classic like you are, it has no such problems. Also, there is a Spirit mailing list, you will get much faster responses there.