Nokogiri backend for XmlMini

[#2190 state:committed]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

2 files changed, 71 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/xml_mini.rb b/activesupport/lib/active_support/xml_mini.rb
index 99158e4ff7..0513c0d4d0 100644
--- a/activesupport/lib/active_support/xml_mini.rb
+++ b/activesupport/lib/active_support/xml_mini.rb
@@ -8,6 +8,10 @@ module ActiveSupport
     extend self
     delegate :parse, :to => :@backend
 
+    class << self
+      attr_reader :backend
+    end
+
     def backend=(name)
       require "active_support/xml_mini/#{name.to_s.downcase}.rb"
       @backend = ActiveSupport.const_get("XmlMini_#{name}")
diff --git a/activesupport/lib/active_support/xml_mini/nokogiri.rb b/activesupport/lib/active_support/xml_mini/nokogiri.rb
new file mode 100644
index 0000000000..bfafa29dd5
--- /dev/null
+++ b/activesupport/lib/active_support/xml_mini/nokogiri.rb
@@ -0,0 +1,67 @@
+# = XML Mini Nokogiri implementation
+module ActiveSupport
+  module XmlMini_Nokogiri #:nodoc:
+    extend self
+
+    # Parse an XML Document string into a simple hash using libxml / nokogiri.
+    # string::
+    #   XML Document string to parse
+    def parse(string)
+      return {} if string.blank?
+      doc = Nokogiri::XML(string).to_hash
+    end
+
+    module Conversions
+      module Document
+        def to_hash
+          root.to_hash
+        end
+      end
+
+      module Node
+        CONTENT_ROOT = '__content__'
+
+        # Convert XML document to hash
+        #
+        # hash::
+        #   Hash to merge the converted element into.
+        def to_hash(hash = {})
+          hash[name] ||= attributes_as_hash
+
+          walker = lambda { |child, memo, callback|
+            next if child.blank?
+
+            if child.text?
+              (memo[CONTENT_ROOT] ||= '') << child.content
+              next
+            end
+
+            name = child.name
+
+            if memo[name]
+              memo[name] = [memo[name]].flatten
+              memo[name] << child.attributes_as_hash
+            else
+              memo[name] = child.attributes_as_hash
+            end
+
+            # Recusively walk children
+            child.children.each { |c| callback.call(c, memo[name], callback) }
+          }
+
+          children.each { |c| walker.call(c, hash[name], walker) }
+          hash
+        end
+
+        def attributes_as_hash
+          Hash[*(attribute_nodes.map { |node|
+            [node.node_name, node.value]
+          }.flatten)]
+        end
+      end
+    end
+
+    Nokogiri::XML::Document.send(:include, Conversions::Document)
+    Nokogiri::XML::Node.send(:include, Conversions::Node)
+  end
+end