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Calculate the differences between two XML/HTML documents.

branch: master
README.md

nokogiri-diff

Description

nokogiri-diff adds the ability to calculate the differences (added or removed nodes) between two XML/HTML documents.

Features

  • Performs a breadth-first comparison between children nodes.
  • Compares XML/HTML Elements, Attributes, Text nodes and DTD nodes.
  • Allows calculating differences between documents, or just enumerating the added or removed nodes.

Examples

Enumerate over the the differences between two HTML documents:

require 'nokogiri/diff'

doc1 = Nokogiri::HTML('<div><p>one</p> two </div>')
doc2 = Nokogiri::HTML('<div><p id="1">one</p> <p>three</p></div>')

doc1.diff(doc2) do |change,node|
  puts "#{change} #{node.to_html}".ljust(30) + node.parent.path
end

#   <div>
# <p>one</p> two </div> /
#   <p>one</p>                  /div
# -  two                        /div
# +                             /div
# + <p>three</p>                /div
# +  id="1"                     /div/p[1]
#   one                         /div/p

Only find the added nodes:

doc1.diff(doc2, :added => true) do |change,node|
  puts node.to_html.ljust(30) + node.parent.path
end

#                               /div
# <p>three</p>                  /div
#  id="1"                       /div/p[1]

Only find the removed nodes:

doc1.diff(doc2, :removed => true) do |change,node|
  puts node.to_html.ljust(30) + node.parent.path
end

#  two                          /div

Requirements

Install

$ gem install nokogiri-diff

Copyright

Copyright (c) 2010-2012 Hal Brodigan

See {file:LICENSE.txt} for details.

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