[antlr-interest] How to stop automatic evaluation in Tree Grammar?

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Hi, gurus, I defined a tree grammar which contains if statements, it looks like below:

ifs: ^(IF test elseif_part else_part) ;

In normal, this rule will generate source code as below:

test(); //it will return a boolean value
....
elseif_part();
....
else_part();

As you see, if the rule 'test' is ok in some conditions, there's no need to evaluate rule 'elseif_part' and 'else_part'.
What I need is conditional tree node expansion. Ideally generated code in my mind:

if (test())
{
 //skip elseif_part and else_part
}else{
  elseif_part();
  if (some condition was satisfied){
    //skip else_part;
  }else{
    else_part();
  }
}

Hope for you help, thanks!


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