Nokogiri でパースしたオブジェクトの xpath 列挙

flatten_attributes.rb

  def flatten_attributes
    objects = {}
    stack = []
    stack << { name: '', object: html.at('body'), children: html.at('body').children.dup }
    while stack.present?
      parent = stack.last
      obj = parent[:object]
      name = parent[:name]
      name += obj.name
      name = "##{obj.attr(:id)}" if obj.attr(:id)
      name += ".#{obj.attr(:class)}" if obj.attr(:class)
  
      unless child = parent[:children].pop
        next stack.pop
      end
      if child.children.length == 1 && child.children.first.text?
        objects[name] ||= []
        objects[name] << child
        next
      end
      stack << { name: "#{name} > ", object: child, children: child.children.dup }
    end
    objects
  end