You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: clean_html.rb
    path of file: ./repos/devdocs/lib/docs/filters/drupal
    
    the code of the file until where you have to start completion: module Docs
  class Drupal
    class CleanHtmlFilter < Filter
      def call
        root_page? ? root : other
        doc
      end

      def root
        doc.inner_html = ' '
      end

      def other
        css('.element-invisible',
            '#sidebar-first',
            '#api-alternatives',
            '#asid
    
      def other
        css('.element-invisible',
            '#sidebar-first',
            '#api-alternatives',
            '#aside',
            '.comments',
            '.view-filters',
            '#api-function-signature tr:not(.active)',
            '.ctools-collapsible-container',
            'img[width="13"]',
            'a:contains("Expanded class hierarchy")',
            'a:contains("All classes that implement")'
        ).remove

        at_css('#main').replace(at_css('.content'))
        at_css('#page-heading').replace(at_css('#page-subtitle'))

        css('th.views-field > a', '.content', 'ins', '.view', '.view-content', 'div.item-list').each do |node|
          node.before(node.children).remove
        end

        css('pre').each do |node|
          node.content = node.content
          node['data-language'] = 'php'
        end

        css('#api-function-signature').each do |table|
          signature = table.css('.signature').first.at_css('code').inner_html
          table.replace '<pre class="signature">' + signature + '</pre>'
        end

        css('table[class]', 'tr[class]', 'td[class]', 'th[class]').each do |node|
          node.remove_attribute('class')
        end
      end