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Re: Blog: YANG Really Takes Off in the Industry

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 09 December 2014 19:39 UTC

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Date: Wed, 10 Dec 2014 08:39:41 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Ted Lemon <Ted.Lemon@nominum.com>
Subject: Re: Blog: YANG Really Takes Off in the Industry
References: <54770BA5.5060603@cisco.com> <809EFD2B-A845-46B7-A394-A9C9E5393CD5@piuha.net> <547874D6.1090001@cisco.com> <7890AE32-F7A9-4C32-9C3D-8251E70B1F29@lucidvision.com> <m2sigyhpxc.wl%randy@psg.com> <8BBBDF7F-00A0-44BD-AA64-DA7044D35012@lucidvision.com> <C51AC247-C16D-4452-874E-0D97BDB009EB@juniper.net> <547D0AEA.4020309@gmail.com> <0BFD0B22-EC45-473F-8E7A-7FB608B60E6F@juniper.net> <139D837E-F131-4791-A026-234699A7E617@nominum.com> <01f901d00ee4$3c077b40$4001a8c0@gateway.2wire.net> <FF42158A-AC42-4EBF-9FCB-1A3EF4162027@nominum.com> <00f601d013bd$a1d23900$4001a8c0@gateway.2wire.net> <822FFCEB-7848-484E-9231-9BFDA4B97672@nominum.com>
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On 10/12/2014 03:54, Ted Lemon wrote:
> On Dec 9, 2014, at 9:31 AM, t.p. <daedulus@btconnect.com> wrote:
>> The expression that controls the permissible format of IPv6 addresses in
>> yang-types is of this ilk.
>> "       type string {
>>         pattern '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}'
>>               + '((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|'
>>               + '(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}'
>>               + '(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))'
>>               + '(/(([0-9])|([0-9]{2})|(1[0-1][0-9])|(12[0-8])))';
>>         pattern '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|'
>>               + '((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)'
>>               + '(/.+)'; "
>> which was got wrong several times before it became what it is now (which
>> rings alarm bells for me).
> 
> Wow, so there's no way to do this ABNF-style?

In fairness, it took numerous attempts to get the ABNF for the text
representation of IPv6 addresses right, with RFC 6874 being the latest
twist (which, if I am not mistaken, is not covered by the above
gobbledygook; at least, I don't see anything in there that seems
equivalent to '"%25" ZoneID', but maybe I missed it).

    Brian

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