roles.py 文件源码

def rfc_reference_role(role, rawtext, text, lineno, inliner,
                       options={}, content=[]):
    try:
        rfcnum = int(text)
        if rfcnum <= 0:
            raise ValueError
    except ValueError:
        msg = inliner.reporter.error(
            'RFC number must be a number greater than or equal to 1; '
            '"%s" is invalid.' % text, line=lineno)
        prb = inliner.problematic(rawtext, rawtext, msg)
        return [prb], [msg]
    # Base URL mainly used by inliner.rfc_reference, so this is correct:
    ref = inliner.document.settings.rfc_base_url + inliner.rfc_url % rfcnum
    set_classes(options)
    node = nodes.reference(rawtext, 'RFC ' + utils.unescape(text), refuri=ref,
                           **options)
    return [node], []