public static void Visit(this Node node, IParseTreeVisitor visitor)
{
int i = 0;
switch (node.Name) {
case "sequence":
visitor.VisitSequence(node);
if (node[i].Name == "var_def") {
visitor.VisitSequence(node);
++i;
}
for (int max = node.Count; i < max; ++i)
node[i].Visit(visitor);
break;
case "var_def":
visitor.VisitVariableDefinition(node);
break;
}
}