def werkzeug2insanities(stream, rule, appname='v.', indent=''):
    # it's not usable :(
    if isinstance(rule, Map):
        stream.write(indent + 'Map(')
        for r in rule._rules:
            werkzeug2insanities(stream, r, appname, indent + '    ')
            stream.write(',\n')
        stream.write(indent + ')\n')
    elif isinstance(rule, Subdomain):
        stream.write(indent + "subdomain('%s') | Map(" % rule.subdomain)
        for r in rule._rules:
            werkzeug2insanities(stream, r, appname, indent + '    ')
            stream.write(',\n')
        stream.write(indent + ')\n')
    elif isinstance(rule, EndpointPrefix):
        for r in rule._rules:
            werkzeug2insanities(stream, r, appname + r.prefix, indent)
    elif isinstance(rule, Rule):
        stream.write('indent')
        if rule.endpoint:
            stream.write("match('%s', '%s%s') | " % (rule.string, appname, rule.endpoint))
        else:
            stream.write("prefix('%s') | " % rule.string)
        if rule.methods:
            stream.write("methods(%s) | " % rule.methods)
        if rule.defaults:
            stream.write("defaults(%s) | " % rule.defaults)

        if rule.endpoint:
            stream.write(appname + endpoint)
        elif rule.redirect_to:
            stream.write("redirect_to(???)")
        else:
            stream.write("???")
    elif isinstance(rule, RuleTemplate):
        stream.write(RuleTemplateFactory)
    else: raise Exception()