In AbstractParseTreeVisitor.h I was struggeling over shouldVisitNextChild(node, result)) in the following part (lines 35-48):

virtual std::any visitChildren(ParseTree *node) override {
   std::any result = defaultResult();
   size_t n = node->children.size();
   for (size_t i = 0; i < n; i++) {
     if (!shouldVisitNextChild(node, result)) {
       break;
     }

     std::any childResult = node->children[i]->accept(this);
     result = aggregateResult(std::move(result), std::move(childResult));
   }

   return result;
 }

Although this function is called in the loop over the children, it tests always the parent. The only validation the function can do is check the result. Is this its intension?

I would have expected

  if (!shouldVisitNextChild(node->children[i], result)) {
    break;
  }

This would allow to see the focussed node.