code: def run(self, lines):
          
          text = "\n".join(lines)
          while 1:
              m = FENCED_BLOCK_RE.search(text)
              if not m:
                  break
              lang = m.group('lang')
              linenums = bool(m.group('linenums'))
              html = highlight_syntax(m.group('code'), lang, linenums=linenums)
              placeholder = self.markdown.htmlStash.store(html, safe=True)
              text = '{}\n{}\n{}'.format(
                  text[:m.start()],
                  placeholder,
                  text[m.end():]
              )
  
          return text.split("\n")
docs: Match and store Fenced Code Blocks in the HtmlStash.