# File lib/premailer/adapter/hpricot.rb, line 10
      def to_inline_css
        doc = @processed_doc
        @unmergable_rules = CssParser::Parser.new

        # Give all styles already in style attributes a specificity of 1000
        # per http://www.w3.org/TR/CSS21/cascade.html#specificity
        doc.search("*[@style]").each do |el|
          el['style'] = '[SPEC=1000[' + el.attributes['style'] + ']]'
        end

        # Iterate through the rules and merge them into the HTML
        @css_parser.each_selector(:all) do |selector, declaration, specificity, media_types|
          # Save un-mergable rules separately
          selector.gsub!(/:link([\s]*)+/i) {|m| $1 }

          # Convert element names to lower case
          selector.gsub!(/([\s]|^)([\w]+)/) {|m| $1.to_s + $2.to_s.downcase }

          if Premailer.is_media_query?(media_types) || selector =~ Premailer::RE_UNMERGABLE_SELECTORS
            @unmergable_rules.add_rule_set!(CssParser::RuleSet.new(selector, declaration), media_types) unless @options[:preserve_styles]
          else
            begin
              if selector =~ Premailer::RE_RESET_SELECTORS
                # this is in place to preserve the MailChimp CSS reset: http://github.com/mailchimp/Email-Blueprints/
                # however, this doesn't mean for testing pur
                @unmergable_rules.add_rule_set!(CssParser::RuleSet.new(selector, declaration))  unless !@options[:preserve_reset]
              end

              # Change single ID CSS selectors into xpath so that we can match more
              # than one element.  Added to work around dodgy generated code.
              selector.gsub!(/\A\#([\w_\-]+)\Z/, '*[@id=\1]')

              # convert attribute selectors to hpricot's format
              selector.gsub!(/\[([\w]+)\]/, '[@\1]')
              selector.gsub!(/\[([\w]+)([\=\~\^\$\*]+)([\w\s]+)\]/, '[@\1\2\'\3\']')

              doc.search(selector).each do |el|
                if el.elem? and (el.name != 'head' and el.parent.name != 'head')
                  # Add a style attribute or append to the existing one
                  block = "[SPEC=#{specificity}[#{declaration}]]"
                  el['style'] = (el.attributes['style'].to_s ||= '') + ' ' + block
                end
              end
            rescue ::Hpricot::Error, RuntimeError, ArgumentError
              $stderr.puts "CSS syntax error with selector: #{selector}" if @options[:verbose]
              next
            end
          end
        end

        # Remove script tags
        if @options[:remove_scripts]
          doc.search("script").remove
        end

        # Read STYLE attributes and perform folding
        doc.search("*[@style]").each do |el|
          style = el.attributes['style'].to_s

          declarations = []

          style.scan(/\[SPEC\=([\d]+)\[(.[^\]\]]*)\]\]/).each do |declaration|
            rs = CssParser::RuleSet.new(nil, declaration[1].to_s, declaration[0].to_i)
            declarations << rs
          end
          # Perform style folding
          merged = CssParser.merge(declarations)
          merged.expand_shorthand!
          merged.create_shorthand!

          # Duplicate CSS attributes as HTML attributes
          if Premailer::RELATED_ATTRIBUTES.has_key?(el.name)
            Premailer::RELATED_ATTRIBUTES[el.name].each do |css_att, html_att|
              el[html_att] = merged[css_att].gsub(/url\('(.*)'\)/,'\1').gsub(/;$|\s*!important/, '').strip if el[html_att].nil? and not merged[css_att].empty?
            end
          end

          # write the inline STYLE attribute
          el['style'] = Premailer.escape_string(merged.declarations_to_s)
        end

        doc = write_unmergable_css_rules(doc, @unmergable_rules)

        if @options[:remove_classes] or @options[:remove_comments]
          doc.search('*').each do |el|
            if el.comment? and @options[:remove_comments]
              lst = el.parent.children
              el.parent = nil
              lst.delete(el)
            elsif el.elem?
              el.remove_attribute('class') if @options[:remove_classes]
            end
          end
        end

        if @options[:reset_contenteditable]
          doc.search('*[@contenteditable]').each do |el|
            el.remove_attribute('contenteditable')
          end
        end

        if @options[:remove_ids]
          # find all anchor's targets and hash them
          targets = []
          doc.search("a[@href^='#']").each do |el|
            target = el.get_attribute('href')[1..-1]
            targets << target
            el.set_attribute('href', "#" + Digest::MD5.hexdigest(target))
          end
          # hash ids that are links target, delete others
          doc.search("*[@id]").each do |el|
            id = el.get_attribute('id')
            if targets.include?(id)
              el.set_attribute('id', Digest::MD5.hexdigest(id))
            else
              el.remove_attribute('id')
            end
          end
        end

        @processed_doc = doc

        @processed_doc.to_original_html
      end