nokogiri_text_node_gsub.rb

    class << self
      protected

      def gsub_text_nodes_only!(html:, placeholder_name:, placeholder_value:)
        fragment = Nokogiri::HTML.fragment(html)
        fragment.traverse do |node|
          next unless node.text?
          # Can't use normal gsub! because it makes a copy of the content memory that is not attached
          # to the node. Have to use the setter provided by nokogiri to update the node
          # https://www.rubydoc.info/github/sparklemotion/nokogiri/Nokogiri%2FXML%2FNode:content=
          node.content = gsub_placeholder!(
            node.content,
            placeholder_name: placeholder_name,
            placeholder_value: placeholder_value,
          )
        end
        # updates the orginal html with are new html
        html.replace(fragment.to_html_preserve_space)
      end

      def gsub_placeholder!(text, placeholder_name:, placeholder_value:)
        text.gsub!(/\{\{\s*#{placeholder_name}\s*\}\}/i, placeholder_value)
      end
    end