def _docutils_rest_to(rest, writer):
""" Uses docutils to convert a ReST string to HTML. Returns a tuple
containg the HTML string and the list of warning nodes that were
removed from the HTML.
"""
# Make sure any Sphinx polution of docutils has been removed.
if Sphinx is not None:
for key, value in docutils_roles.items():
if value.__module__.startswith('sphinx'):
docutils_roles.pop(key)
pub = Publisher(source_class=docutils.io.StringInput,
destination_class=docutils.io.StringOutput)
pub.set_reader('standalone', None, 'restructuredtext')
pub.set_writer(writer)
pub.writer.default_stylesheet_path=''
pub.get_settings() # Get the default settings
pub.settings.halt_level = 6 # Don't halt on errors
pub.settings.warning_stream = StringIO()
pub.set_source(rest)
pub.set_destination()
pub.document = pub.reader.read(pub.source, pub.parser, pub.settings)
pub.apply_transforms()
# Walk the node structure of a docutils document and remove 'problematic'
# and 'system_message' nodes. Save the system_message nodes.
warning_nodes = []
for node in pub.document.traverse(docutils.nodes.problematic):
node.parent.replace(node, node.children[0])
for node in pub.document.traverse(docutils.nodes.system_message):
warning_nodes.append(node)
node.parent.remove(node)
return pub.writer.write(pub.document, pub.destination), warning_nodes
