Nokogiri: need to turn markup partitioned by `hr`

2019-08-05 16:45发布

站内问答 / Ruby
834 3 4

Given markup inside an HTML document that looks like this

<h3>test</h3>
<p>test</p>
<hr/>
<h3>test2</h3>
<p>test2</p>
<hr/>

I'd like to to produce this

<div>
  <h3>test</h3>
  <p>test</p>
</div>
<div>
  <h3>test2</h3>
  <p>test2</p>
</div>

What's the most elegant way to do with with Nokogiri?

标签： ruby nokogiri
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3条回答
干净又极端
2楼-- · 2019-08-05 17:18

Here's an answer that uses Ruby 1.9.2's Enumerable#chunk to split the children into sections and also exercises Nokogiri's NodeSet class:

require 'nokogiri'
doc = Nokogiri::HTML <<ENDHTML
  <h3>test</h3>
  <p>test</p>
  <hr/>
  <h3>test2</h3>
  <p>test2</p>
  <hr/>
ENDHTML

result = Nokogiri::XML::NodeSet.new( doc,
  doc.xpath('//body/*').chunk do |n|
    n.name=='hr'
  end.reject do |matched,nodes|
    matched
  end.map do |matched,nodes|
    doc.create_element('div').tap do |div|
      div << Nokogiri::XML::NodeSet.new( doc, nodes )
    end
  end )

puts result
#=> <div>
#=> <h3>test</h3>
#=> <p>test</p>
#=> </div>
#=> <div>
#=> <h3>test2</h3>
#=> <p>test2</p>
#=> </div>
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家丑人穷心不美
3楼-- · 2019-08-05 17:40

This is how I'd go about it:

require 'nokogiri'

html = '
<h3>test</h3>
<p>test</p>
<hr/>
<h3>test2</h3>
<p>test2</p>
<hr/>
'

doc = Nokogiri::HTML(html)
doc2 = Nokogiri::HTML('<body />')
doc2_body = doc2.at('body')

doc.search('//h3 | //p').each_slice(2) do |ns| 
  nodeset = Nokogiri::XML::NodeSet.new(doc2, ns)
  div = Nokogiri::XML::Node.new('div', doc2)
  div.add_child(nodeset)
  doc2_body.add_child(div) 
end

puts doc2_body.inner_html

# >> <div>
# >> <h3>test</h3>
# >> <p>test</p>
# >> </div>
# >> <div>
# >> <h3>test2</h3>
# >> <p>test2</p>
# >> </div>
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Root（大扎）
4楼-- · 2019-08-05 17:43

Edit: Reworked answer to be a bit cleaner.
Edit2: Small rewrite to shorten by two lines

require 'nokogiri'    
doc = Nokogiri::HTML <<ENDHTML
  <h3>test</h3>
  <p>test</p>
  <hr/>
  <h3>test2</h3>
  <p>test2</p>
  <hr/>
ENDHTML

body = doc.at_css('body')         # Created by parsing as HTML
kids = body.xpath('./*')          # Every child of the body
body.inner_html = ""              # Empty the body now that we have our nodes

div = (body << "<div>").first     # Create our first container in the body
kids.each do |node|               # For every child that was in the body...
  if node.name=='hr'              
    div = (body << '<div>').first # Create a new container for stuff
  else                            
    div << node                   # Move this into the last container
  end                             
end                               
div.remove unless div.child       # Get rid of a trailing, empty div

puts body.inner_html
#=> <div>
#=> <h3>test</h3>
#=> <p>test</p>
#=> </div>
#=> <div>
#=> <h3>test2</h3>
#=> <p>test2</p>
#=> </div>
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