references.py 文件源码

def visit_reference(self, node):
        if node.resolved or not node.hasattr('refname'):
            return
        refname = node['refname']
        id = self.document.nameids.get(refname)
        if id is None:
            for resolver_function in self.unknown_reference_resolvers:
                if resolver_function(node):
                    break
            else:
                if refname in self.document.nameids:
                    msg = self.document.reporter.error(
                        'Duplicate target name, cannot be used as a unique '
                        'reference: "%s".' % (node['refname']), base_node=node)
                else:
                    msg = self.document.reporter.error(
                        'Unknown target name: "%s".' % (node['refname']),
                        base_node=node)
                msgid = self.document.set_id(msg)
                prb = nodes.problematic(
                      node.rawsource, node.rawsource, refid=msgid)
                prbid = self.document.set_id(prb)
                msg.add_backref(prbid)
                node.replace_self(prb)
        else:
            del node['refname']
            node['refid'] = id
            self.document.ids[id].note_referenced_by(id=id)
            node.resolved = 1