1 files changed, 86 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/xml_mini/nokogirisax.rb b/activesupport/lib/active_support/xml_mini/nokogirisax.rb
new file mode 100644
index 0000000000..55cd72e093
--- /dev/null
+++ b/activesupport/lib/active_support/xml_mini/nokogirisax.rb
@@ -0,0 +1,86 @@
+# frozen_string_literal: true
+
+begin
+  require "nokogiri"
+rescue LoadError => e
+  $stderr.puts "You don't have nokogiri installed in your application. Please add it to your Gemfile and run bundle install"
+  raise e
+end
+require "active_support/core_ext/object/blank"
+require "stringio"
+
+module ActiveSupport
+  module XmlMini_NokogiriSAX #:nodoc:
+    extend self
+
+    # Class that will build the hash while the XML document
+    # is being parsed using SAX events.
+    class HashBuilder < Nokogiri::XML::SAX::Document
+      CONTENT_KEY   = "__content__"
+      HASH_SIZE_KEY = "__hash_size__"
+
+      attr_reader :hash
+
+      def current_hash
+        @hash_stack.last
+      end
+
+      def start_document
+        @hash = {}
+        @hash_stack = [@hash]
+      end
+
+      def end_document
+        raise "Parse stack not empty!" if @hash_stack.size > 1
+      end
+
+      def error(error_message)
+        raise error_message
+      end
+
+      def start_element(name, attrs = [])
+        new_hash = { CONTENT_KEY => +"" }.merge!(Hash[attrs])
+        new_hash[HASH_SIZE_KEY] = new_hash.size + 1
+
+        case current_hash[name]
+        when Array then current_hash[name] << new_hash
+        when Hash  then current_hash[name] = [current_hash[name], new_hash]
+        when nil   then current_hash[name] = new_hash
+        end
+
+        @hash_stack.push(new_hash)
+      end
+
+      def end_element(name)
+        if current_hash.length > current_hash.delete(HASH_SIZE_KEY) && current_hash[CONTENT_KEY].blank? || current_hash[CONTENT_KEY] == ""
+          current_hash.delete(CONTENT_KEY)
+        end
+        @hash_stack.pop
+      end
+
+      def characters(string)
+        current_hash[CONTENT_KEY] << string
+      end
+
+      alias_method :cdata_block, :characters
+    end
+
+    attr_accessor :document_class
+    self.document_class = HashBuilder
+
+    def parse(data)
+      if !data.respond_to?(:read)
+        data = StringIO.new(data || "")
+      end
+
+      if data.eof?
+        {}
+      else
+        document = document_class.new
+        parser = Nokogiri::XML::SAX::Parser.new(document)
+        parser.parse(data)
+        document.hash
+      end
+    end
+  end
+end