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Re: [Json] Proposal: the minimal edit

Carsten Bormann <cabo@tzi.org> Tue, 25 June 2013 12:57 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Tue, 25 Jun 2013 14:57:17 +0200
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To: John Cowan <cowan@mercury.ccil.org>
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Subject: Re: [Json] Proposal: the minimal edit
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On Jun 25, 2013, at 14:51, John Cowan <cowan@mercury.ccil.org> wrote:

> Carsten Bormann scripsit:
> 
>> Try writing the ABNF for surrogate pair escapes and you'll see what I mean.
>> (Sure, it *can* be done.  Would you want to?)
> 
> Sure, why not?  You just change
> 
>    unescaped = %x20-21 / %x23-5B / %x5D-10FFFF
> 
> to
> 
>     unescaped = %x20-21 / %x23-5B / %x5D-D7FF / %xE000-10FFFF

You also have to fix the "\u" 4HEXDIG part (if you don't, it seems that ill-formed Unicode is allowed in escape sequences and not in native coding).
This gets ugly quickly.
Even uglier if you want to exclude the non-character code points as well.

Remember that this was written at a time when JSON was still vying for its space.
The appearance of complexity needed to be avoided.
So why encode things in the ABNF that already are handled by Unicode?

(Again, this is all about spec exegesis, not about reality.)

Grüße, Carsten

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