你可以使用#before和#after来添加新行：

doc.search('p,div,br').each{ |e| e.after "\n" }

这是我的解决方案：

fragment = 'hell<span>o</span><p>world<p>I am Josh</p></p>'
HtmlToText.process(fragment)
=> "hello\n\nworld\n\nI am Josh"

我遍历nokogiri树，构建一个文本字符串，对于块元素用"\n\n" Package 文本，对于行内元素用"" Package 文本。然后使用gsub来清除最后\n字符的丰度。有点古怪但很管用。

require 'nokogiri'

class HtmlToText
  class << self
    def process html
      nokogiri = Nokogiri::HTML(html)
      text = ''
      nokogiri.traverse do |el|
        if el.class == Nokogiri::XML::Element
          sep = inline_element?(el) ? "" : "\n"
          if el.children.length <= 0
            text += "#{sep}"
          else 
            text = "#{sep}#{sep}#{text}#{sep}#{sep}"
          end
        elsif el.class == Nokogiri::XML::Text
          text += el.text
        end
      end
      text.gsub(/\n{3,}/, "\n\n").gsub(/(\A\n+)|(\n+\z)/, "")
    end

    private

    def inline_element? el
      el && el.try(:name) && inline_elements.include?(el.name)
    end

    def inline_elements
      %w(
        a abbr acronym b bdo big br button cite code dfn em i img input
        kbd label map object q samp script select small span strong sub
        sup textarea time tt var
      )
    end
  end
end