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Re: [Json] Seeking more input on draft-ietf-json-text-sequence

Nico Williams <nico@cryptonector.com> Thu, 22 May 2014 17:23 UTC

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Date: Thu, 22 May 2014 12:22:57 -0500
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From: Nico Williams <nico@cryptonector.com>
To: "Manger, James" <James.H.Manger@team.telstra.com>
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Cc: Paul Hoffman <paul.hoffman@vpnc.org>, IETF JSON WG <json@ietf.org>
Subject: Re: [Json] Seeking more input on draft-ietf-json-text-sequence
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On Thu, May 22, 2014 at 12:21 AM, Manger, James
<James.H.Manger@team.telstra.com> wrote:
>>  JSON-sequence = *(JSON-text LF)
>
> No, because that means a payload of, say, 2 newlines is invalid. It should be a valid sequence of 0 JSON items. It is too easy to get stray newlines to reject them.

Good catch.

>>  JSON-sequence = *ws *(value text-sep *ws)
>>  text-sep = *(SP / HTAB / CR) LF ; these are from RFC5234
>>  ws = <given by RFC7159>
>>  value = <given by RFC7159>
>
> This still does not deal with greedy parsers as <value> includes leading and trailing optional whitespace for objects and arrays (but not for primitives).

Ah, yes, because begin-* and end-* have ws.  Oh well, then I give up
on the greedy matching issue.

> Acceptable versions:
>
>   JSON-sequence = *(JSON-text LF) ws
> or
>   JSON-sequence = ws *(JSON-text ws LF ws)
>
> with
>   ws = <given by RFC7159> ; optional whitespace
>   JSON-text = <given by RFC7159>
>   LF = <given by RFC5234> ; linefeed %x0A

I'll take the second.  Thanks!

Nico
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