如何把一组< p>在< div>内

问题描述：

我想通过使用以下Ruby代码和 Nokogiri ：

I'd like to figure out a way to get to the HTML result (mentioned further below) by using the following Ruby code and Nokogiri:

require 'rubygems'
require 'nokogiri'

value = Nokogiri::HTML.parse(<<-HTML_END)
  "<html>
    <body>
      <p id='1'>A</p>
      <p id='2'>B</p>
      <h1>Bla</h1>
      <p id='3'>C</p>
      <p id='4'>D</p>
      <p id='5'>E</p>
    </body>
  </html>"
HTML_END

# The selected-array is given by the application.
# It consists of a sorted array with all ids of 
# <p> that need to be enclosed by the <div>
selected = ["2","3","4"]
first_p = selected.first
last_p = selected.last

#
# WHAT RUBY CODE DO I NEED TO INSERT HERE TO GET
# THE RESULTING HTML AS SEEN BELOW?
#

生成的HTML应如下所示（请注意插入的< div id ='XYZ'> ）：

The resulting HTML should look like this (please note the inserted <div id='XYZ'>):

<html>
  <body>
    <p id='1'>A</p>
    <div id='XYZ'>
      <p id='2'>B</p>
      <h1>Bla</h1>
      <p id='3'>C</p>
      <p id='4'>D</p>
    </div>
    <p id='5'>E</p>
  </body>
</html>

答

这是我在我的项目（Vlad @ SO& Whitelist @ irc＃rubyonrails：感谢您的帮助和灵感）：

This is the working solution I've implemented into my project (Vlad@SO & Whitelist@irc#rubyonrails: Thanks for your help and inspiration.):

require 'rubygems'
require 'nokogiri'

value = Nokogiri::HTML.parse(<<-HTML_END)
  "<html>
    <body>
      <p id='1'>A</p>
      <p id='2'>B</p>
      <h1>Bla</h1>
      <p id='3'>C</p>
      <p id='4'>D</p>
      <p id='5'>E</p>
    </body>
  </html>"
HTML_END

# The selected-array is given by the application.
# It consists of a sorted array with all ids of 
# <p> that need to be enclosed by the <div>
selected = ["2","3","4"]

# We want an elements, not nodesets!
# .first returns Nokogiri::XML::Element instead of Nokogiri::XML::nodeset
first_p = value.css("p##{selected.first}").first
last_p = value.css("p##{selected.last}").first
parent = value.css('body').first

# build and set new div_node
div_node = Nokogiri::XML::Node.new('div', value)
div_node['class'] = 'XYZ'

# add div_node before first_p
first_p.add_previous_sibling(div_node)

selected_node = false

parent.children.each do |tag|
  # if it's the first_p
  selected_node = true if selected.include? tag['id']
  # if it's anything between the first_p and the last_p
  div_node.add_child(tag) if selected_node
  # if it's the last_p
  selected_node = false if selected.last == tag['id']
end

puts value.to_html

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