# File lib/html/pipeline/email_reply_filter.rb, line 36
      def call
        found_hidden = nil
        paragraphs = EmailReplyParser.read(text.dup).fragments.map do |fragment|
          pieces = [escape_html(fragment.to_s.strip).gsub(/^\s*(>|>)/, '')]
          if fragment.quoted?
            if context[:hide_quoted_email_addresses]
              pieces.map! do |piece|
                piece.gsub(EMAIL_REGEX, HIDDEN_EMAIL_PATTERN)
              end
            end
            pieces.unshift EMAIL_QUOTED_HEADER
            pieces << EMAIL_HEADER_END
          elsif fragment.signature?
            pieces.unshift EMAIL_SIGNATURE_HEADER
            pieces << EMAIL_HEADER_END
          else
            pieces.unshift EMAIL_FRAGMENT_HEADER
            pieces << EMAIL_HEADER_END
          end
          if fragment.hidden? && !found_hidden
            found_hidden = true
            pieces.unshift EMAIL_HIDDEN_HEADER
          end
          pieces.join
        end
        paragraphs << EMAIL_HEADER_END if found_hidden
        paragraphs.join("\n")
      end