def run(self):
        if self.content_offset > self.lineno or not self.content:
            raise self.error('"%s" directive requires arguments on the first '
                             'line.' % self.name)
        args = self.content[0]
        match = self.argument_pattern.match(args)
        if not match:
            raise self.error('"%s" directive arguments not valid role names: '
                             '"%s".' % (self.name, args))
        new_role_name = match.group(1)
        base_role_name = match.group(3)
        messages = []
        if base_role_name:
            base_role, messages = roles.role(
                base_role_name, self.state_machine.language, self.lineno,
                self.state.reporter)
            if base_role is None:
                error = self.state.reporter.error(
                    'Unknown interpreted text role "%s".' % base_role_name,
                    nodes.literal_block(self.block_text, self.block_text),
                    line=self.lineno)
                return messages + [error]
        else:
            base_role = roles.generic_custom_role
        assert not hasattr(base_role, 'arguments'), (
            'Supplemental directive arguments for "%s" directive not '
            'supported (specified by "%r" role).' % (self.name, base_role))
        try:
            converted_role = convert_directive_function(base_role)
            (arguments, options, content, content_offset) = (
                self.state.parse_directive_block(
                self.content[1:], self.content_offset, converted_role,
                option_presets={}))
        except states.MarkupError, detail:
            error = self.state_machine.reporter.error(
                'Error in "%s" directive:\n%s.' % (self.name, detail),
                nodes.literal_block(self.block_text, self.block_text),
                line=self.lineno)
            return messages + [error]
        if 'class' not in options:
            try:
                options['class'] = directives.class_option(new_role_name)
            except ValueError, detail:
                error = self.state_machine.reporter.error(
                    u'Invalid argument for "%s" directive:\n%s.'
                    % (self.name, SafeString(detail)), nodes.literal_block(
                    self.block_text, self.block_text), line=self.lineno)
                return messages + [error]
        role = roles.CustomRole(new_role_name, base_role, options, content)
        roles.register_local_role(new_role_name, role)
        return messages
Dynamically create and register a custom interpreted text role.
dataset/ETHPy150Open timonwong/OmniMarkupPreviewer/OmniMarkupLib/Renderers/libs/python2/docutils/parsers/rst/directives/misc.py/Role.run