Initial commit.

.document

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+- 
+ChangeLog.*
+LICENSE.txt

.gitignore

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+doc/
+pkg/

.rspec

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+--colour --format documentation

.yardopts

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+--markup markdown --title "nokogiri-diff Documentation" --protected

ChangeLog.md

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+### 0.1.0 / 2010-11-14
+
+* Initial release:
+

LICENSE.txt

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+Copyright (c) 2010 Hal Brodigan
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# nokogiri-diff
+
+* [Source](http://github.com/postmodern/nokogiri-diff)
+* [Issues](http://github.com/postmodern/nokogiri-diff/issues)
+* Postmodern (postmodern.mod3 at gmail.com)
+
+## Description
+
+nokogiri-diff adds the ability to calculate the differences (added or
+removed nodes) between two XML/HTML documents.
+
+## Examples
+
+    require 'nokogiri/diff'
+
+## Requirements
+
+* [tdiff](http://github.com/postmodern/tdiff) ~> 0.3.0
+* [nokogiri](http://nokogiri.rubyforge.org/) ~> 1.4.1
+
+## Install
+
+    $ gem install nokogiri-diff
+
+## Copyright
+
+Copyright (c) 2010 Hal Brodigan
+
+See {file:LICENSE.txt} for details.

Rakefile

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+require 'rubygems'
+require 'rake'
+
+begin
+  gem 'ore-tasks', '~> 0.3.0'
+  require 'ore/tasks'
+
+  Ore::Tasks.new
+rescue LoadError => e
+  STDERR.puts e.message
+  STDERR.puts "Run `gem install ore-tasks` to install 'ore/tasks'."
+end
+
+begin
+  gem 'rspec', '~> 2.0.0'
+  require 'rspec/core/rake_task'
+
+  RSpec::Core::RakeTask.new
+rescue LoadError => e
+  task :spec do
+    abort "Please run `gem install rspec` to install RSpec."
+  end
+end
+task :default => :spec
+
+begin
+  gem 'yard', '~> 0.6.0'
+  require 'yard'
+
+  YARD::Rake::YardocTask.new  
+rescue LoadError => e
+  task :yard do
+    abort "Please run `gem install yard` to install YARD."
+  end
+end

gemspec.yml

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+name: nokogiri-diff
+version: 0.1.0
+summary: Calculate the differences between two XML/HTML documents.
+description:
+  Nokogiri::Diff adds the ability to calculate the differences (added
+  or removed nodes) between two XML/HTML documents.
+
+license: MIT
+authors: Postmodern
+email: postmodern.mod3@gmail.com
+homepage: http://github.com/postmodern/nokogiri-diff
+has_yard: true
+
+dependencies:
+  tdiff: ~> 0.3.0
+  nokogiri: ~> 1.4.1
+
+development_dependencies:
+  ore-tasks: ~> 0.3.0
+  rspec: ~> 2.0.0
+  yard: ~> 0.6.0

lib/nokogiri/diff.rb

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+require 'nokogiri/diff/node'

lib/nokogiri/diff/node.rb

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+require 'nokogiri'
+require 'tdiff'
+
+class Nokogiri::XML::Node
+
+  include TDiff
+  include TDiff::Unordered
+
+  #
+  # Compares two XML/HTML nodes.
+  #
+  # @param [Nokogiri::XML::Node] node1
+  #
+  # @param [Nokogiri::XML::Node] node2
+  #
+  # @return [Boolean]
+  #   Specifies whether the two nodes are equal.
+  #
+  def tdiff_equal(node)
+    if (self.class == node.class)
+      case node
+      when Nokogiri::XML::Document
+        self.root.tdiff_equal(node.root)
+      when Nokogiri::XML::Attr
+        (self.name == node.name && self.value == node.value)
+      when Nokogiri::XML::Element
+        self.name == node.name
+      when Nokogiri::XML::Text
+        self.text == node.text
+      else
+        false
+      end
+    else
+      false
+    end
+  end
+
+  #
+  # Enumerates over the children of a XML/HTML node.
+  #
+  # @param [Nokogiri::XML::Node] node
+  # 
+  # @yield [child]
+  #   The given block will be passed every child of the node.
+  #
+  # @yieldparam [Nokogiri::XML::Node] node
+  #   A child node.
+  #
+  def tdiff_each_child(node,&block)
+    if node.kind_of?(Nokogiri::XML::Element)
+      node.attributes.each_value(&block)
+    end
+
+    node.children.each(&block)
+  end
+
+  #
+  # Finds the differences between the node and another node.
+  #
+  # @param [Nokogiri::XML::Node] other
+  #   The other node to compare against.
+  #
+  # @param [Hash] options
+  #   Additional options for filtering changes.
+  #
+  # @option options [Boolean] :added
+  #   Yield nodes that were added.
+  #
+  # @option options [Boolean] :removed
+  #   Yield nodes that were removed.
+  #
+  # @yield [change, node]
+  #   The given block will be passed each changed node.
+  #
+  # @yieldparam [' ', '-', '+'] change
+  #   Indicates whether the node stayed the same, was removed or added.
+  #
+  # @yieldparam [Nokogiri::XML::Node] node
+  #   The changed node.
+  #
+  # @return [Enumerator]
+  #   If no block was given, an Enumerator object will be returned.
+  #
+  def diff(other,options={},&block)
+    return enum_for(:diff,other,options) unless block
+
+    if (options[:added] || options[:removed])
+      tdiff_unordered(other) do |change,node|
+        if (change == '+' && options[:added])
+          yield change, node
+        elsif (change == '-' && options[:removed])
+          yield change, node
+        end
+      end
+    else
+      tdiff(other,&block)
+    end
+  end
+
+end

nokogiri-diff.gemspec

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+# -*- encoding: utf-8 -*-
+
+begin
+  Ore::Specification.new do |gemspec|
+    # custom logic here
+  end
+rescue NameError
+  STDERR.puts "The 'nokogiri-diff.gemspec' file requires Ore."
+  STDERR.puts "Run `gem install ore-core` to install Ore."
+end

spec/diff_spec.rb

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+require 'spec_helper'
+require 'nokogiri/diff'
+
+describe Nokogiri::Diff do
+  it "should have a VERSION constant" do
+    Nokogiri::Diff.const_get('VERSION').should_not be_empty
+  end
+end

spec/spec_helper.rb

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+gem 'rspec', '~> 2.0.0'
+require 'rspec'
+require 'nokogiri/diff/version'
+
+include Nokogiri::Diff
+