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: math_filter.rb
    path of file: ./repos/gitlabhq/lib/banzai/filter
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Generated HTML is transformed back to GFM by:
# - app/assets/javascripts/behav
    
      def process_math_codeblock
        doc.xpath(XPATH_MATH).each do |node|
          pre_node = node.parent
          pre_node[STYLE_ATTRIBUTE] = 'display'
          pre_node[:class] = TAG_CLASS
        end
      end