python sphinx - How to programmatically interpret reStructuredText into docutil nodes? -

i'm writing custom roles/directives in sphinx, , need insert node in interpret text string restructuredtext. there way this?

i found source http://agateau.com/2015/docutils-snippets says how use docutils.nodes classes construct doctree fragment programmatically, e.g.

class bulletlist(directive):     def run(self):         fruits = ['apples', 'oranges', 'bananas']          lst = nodes.bullet_list()         fruit in fruits:             item = nodes.list_item()             lst += item             item += nodes.paragraph(text=fruit)          return [lst] 

what want like

:myrole:`this *really* cool|trade|` 

by doing in conf.py:

def myrole(name, rawtext, text, lineno, inliner, options={}, content=[]):     # somehow convert "text" parameter docutils nodes     # interpreting rst     nodes = ???? goes here ???     return nodes, []  def setup(app):     app.add_role('myrole', myrole)