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/erlang
    
    the code of the file until where you have to start completion: module Docs
  class Erlang
    class CleanHtmlFilter < Filter
      def call
        @doc = at_css('#content')

        # frontpage

        css('center:last-child').remove # copyright
        css('.footer').remove # copyright

        css('center', '.example').each do |node|
          node.before(node.children).remove
        end

        css('> font[size="+1"]:first-child').each do |node|
          node.name = 'h1'
        end

        css('p > b:first-child:last-child > font[size="+1"]').each do |node|
          node = node.parent.parent
          node.name = 'h2'
          node.content = node.content
        end

        css('font').each do |node|
          node.before(node.children).remove
        end

        # others

        # Remove JS on-hover highlighting
        css('h3.title-link', 'h4.title-link', 'div.data-type-name', 'div.func-head').each do |node|
          node.remove_attribute('onmouseover')
          node.remove_attribute('onmouseout')
        end

        css('h3').each do |node|
          content = node.content
          node.content = content.capitalize if content == content.upcase
        end

        # Subsume "Types" heading under function head heading
        css('h4.func-head + .fun-types > h3.func-types-title')
          .each { |node| node.name = 'h5' }

        css('p > a[name]').each do |node|
          parent = node.parent
          parent.name = 'h4'
          parent['id'] ||= node['name']
          parent.css('> br:last-child').remove
        end
        css('a[name]:empty').each { |n| (n.next_element || n.parent)['id'] ||= n['name'] }

        css('h3', 'h4', 'h5').each do |node|
    
      def call
        @doc = at_css('#content')

        # frontpage

        css('center:last-child').remove # copyright
        css('.footer').remove # copyright

        css('center', '.example').each do |node|
          node.before(node.children).remove
        end

        css('> font[size="+1"]:first-child').each do |node|
          node.name = 'h1'
        end

        css('p > b:first-child:last-child > font[size="+1"]').each do |node|
          node = node.parent.parent
          node.name = 'h2'
          node.content = node.content
        end

        css('font').each do |node|
          node.before(node.children).remove
        end

        # others

        # Remove JS on-hover highlighting
        css('h3.title-link', 'h4.title-link', 'div.data-type-name', 'div.func-head').each do |node|
          node.remove_attribute('onmouseover')
          node.remove_attribute('onmouseout')
        end

        css('h3').each do |node|
          content = node.content
          node.content = content.capitalize if content == content.upcase
        end

        # Subsume "Types" heading under function head heading
        css('h4.func-head + .fun-types > h3.func-types-title')
          .each { |node| node.name = 'h5' }

        css('p > a[name]').each do |node|
          parent = node.parent
          parent.name = 'h4'
          parent['id'] ||= node['name']
          parent.css('> br:last-child').remove
        end
        css('a[name]:empty').each { |n| (n.next_element || n.parent)['id'] ||= n['name'] }

        css('h3', 'h4', 'h5').each do |node|
          node.name = node.name.sub(/\d/) { |i| i.to_i - 1 }
        end

        # Convert <span/> code blocks to <code/> if inline otherwise <pre><code/></pre>
        css('span.bold_code', 'span.code', '.func-head > span.title-name').each do |node|
          node.remove_attribute('class')
          node.css('span.bold_code', 'span.code')
            .each { |n| n.before(n.children).remove }
          if node.at_css('br') then
            node.name = 'pre'
            node.inner_html = "<code>" +
                              node.inner_html.remove(/\n/).gsub('<br>', "\n").strip +
                              "</code>"
          else
            node.name = 'code'
            node.inner_html = node.inner_html.strip.gsub(/\s+/, ' ')
          end
        end