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[Cbor] 0.8.19: .abnfb too (Re: cddl 0.8.17: Add .abnf (draft-ietf-cbor-cddl-control))

Carsten Bormann <cabo@tzi.org> Fri, 26 February 2021 10:53 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Fri, 26 Feb 2021 11:53:34 +0100
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Subject: [Cbor] 0.8.19: .abnfb too (Re: cddl 0.8.17: Add .abnf (draft-ietf-cbor-cddl-control))
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0.8.19 now implements .anbfb as well.

You can now do seriously weird things such as:


message = text .abnfb ("message" .cat rfc4505)

rfc4505 = '
message     = [ email / token ]
              ;; to be prepared in accordance with Section 3

UTF1        = %x00-3F / %x41-7F ;; less "@" (U+0040)
UTF2        = %xC2-DF UTF0
UTF3        = %xE0 %xA0-BF UTF0 / %xE1-EC 2(UTF0) /
              %xED %x80-9F UTF0 / %xEE-EF 2(UTF0)
UTF4        = %xF0 %x90-BF 2(UTF0) / %xF1-F3 3(UTF0) /
              %xF4 %x80-8F 2(UTF0)
UTF0        = %x80-BF

TCHAR       = UTF1 / UTF2 / UTF3 / UTF4
              ;; any UTF-8 encoded Unicode character
              ;; except "@" (U+0040)

email        = "too@much.work"; for this example
;email       = addr-spec
              ;; as defined in [IMAIL]

token       = 1*255TCHAR
'


or


oid = bytes .abnfb ("oid" .cat cbor-tags-oid)

cbor-tags-oid = '
oid = 1*arc
roid = *arc
arc = [nlsb] %x00-7f
nlsb = %x81-ff *%x80-ff
‘

Enjoy!

Grüße, Carsten

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