[antlr-interest] Unknown method for CommonTreeNodeStream: getNodeIndex

[fridi]

Hi Terence,

could you please give me a hint which one of the examples fits best the 
if-then-else problem?
thanks in advance, fridi.

Terence Parr schrieb:
> Hi Steven, I'd recommend staying away from tree-based interpreters that need to jump around. The code samples for my book, which are free, gives you an example though. I've moved away from that node Index stuff.
>
> Ter
> On Feb 1, 2010, at 4:37 AM, Steven Raemaekers wrote:
>
>   
>> Hello,
>>
>> I'm trying to make a tree walker for an if statement, in which the statement
>> part should of course only execute when the boolean expression part is true.
>> The problem is that in an example I found on the internet, I found that I
>> should use stream.push(...) and stream.pop() to insert tokens into
>> the stream that should be executed.
>>
>> The problem is, getNodeIndex does not exist for CommonTreeNodeStream...but
>> how do I know the index which is needed for stream.push(index)?
>>
>> ifstatement
>> @after {
>> CommonTree expressionNode = (CommonTree)$ifstatement.start.getChild(0);
>> CommonTree instructionlistNode = (CommonTree)$ifstatement.start.getChild(1);
>> if ($b.value == true)
>> {
>> System.out.println("LogoTree.g, ifstatement evaluates to true");
>> CommonTreeNodeStream stream = (CommonTreeNodeStream)input;
>> stream.push(stream.getNodeIndex(instructionlistNode));
>>                instructionlist();
>>                stream.pop();
>> }
>> }
>> : ^(IF b = booleanexpression .)
>> ;
>>
>> This does not work, since getNodeIndex does not exist for
>> CommonTreeNodeStream. Examples are rather scarce on the internet...something
>> this elemental should be more easy to implement, this has taken me days
>> now... Does anybody have any other ideas how to make an if statement? Any
>> help is greatly appreciated!
>>
>>
>> -- 
>> Regards,
>>
>> Steven Raemaekers
>>
>> List: http://www.antlr.org/mailman/listinfo/antlr-interest
>> Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address
>>     
>
>
> List: http://www.antlr.org/mailman/listinfo/antlr-interest
> Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address
>
>