class RubyProf::CallStackPrinter

def print_stack(output, visited, call_tree, parent_time)
  total_time = call_tree.total_time
  percent_parent = (total_time/parent_time)*100
  percent_total = (total_time/@overall_time)*100
  return unless percent_total > min_percent
  color = self.color(percent_total)
  visible = percent_total >= threshold
  expanded = percent_total >= expansion
  display = visible ? "block" : "none"
  output << "<li class=\"color#{color}\" style=\"display:#{display}\">" << "\n"
  if visited.include?(call_tree)
    output << "<a href=\"#\" class=\"toggle empty\" ></a>" << "\n"
    output << "<span>%s %s</span>" % [link(call_tree.target, true), graph_link(call_tree)] << "\n"
  else
    visited << call_tree
    if call_tree.children.empty?
      output << "<a href=\"#\" class=\"toggle empty\" ></a>" << "\n"
    else
      visible_children = call_tree.children.any?{|ci| (ci.total_time/@overall_time)*100 >= threshold}
      image = visible_children ? (expanded ? "minus" : "plus") : "empty"
      output << "<a href=\"#\" class=\"toggle #{image}\" ></a>" << "\n"
    end
    output << "<span>%4.2f%% (%4.2f%%) %s %s</span>" % [percent_total, percent_parent,
                                                        link(call_tree.target, false), graph_link(call_tree)] << "\n"
    unless call_tree.children.empty?
      output <<  (expanded ? '<ul>' : '<ul style="display:none">')  << "\n"
      call_tree.children.sort_by{|c| -c.total_time}.each do |child_call_tree|
        print_stack(output, visited, child_call_tree, total_time)
      end
      output << '</ul>' << "\n"
    end
    visited.delete(call_tree)
  end
  output << '</li>' << "\n"
end