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Re: JSON for PG 9.2

From: Garick Hamlin <ghamlin(at)isc(dot)upenn(dot)edu>
To: "David E(dot) Wheeler" <david(at)kineticode(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Joey Adams <joeyadams3(dot)14159(at)gmail(dot)com>, Claes Jakobsson <claes(at)surfar(dot)nu>,Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>, Merlin Moncure<mmoncure(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Jan Urbański <wulczer(at)wulczer(dot)org>, Simon Riggs<simon(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>,PostgreSQL-development Hackers <pgsql-hackers(at)postgresql(dot)org>, Jan Wieck<janwieck(at)yahoo(dot)com>
Subject: Re: JSON for PG 9.2
Date: 2012-01-20 17:32:45
Message-ID: 20120120173245.GA12828@isc.upenn.edu (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, Jan 20, 2012 at 09:12:13AM -0800, David E. Wheeler wrote:
> On Jan 19, 2012, at 9:07 PM, Tom Lane wrote:
> 
> > If his client encoding is UTF8, the value will be letter-perfect JSON
> > when it gets to him; and if his client encoding is not UTF8, then he's
> > already pretty much decided that he doesn't give a fig about the
> > Unicode-centricity of the JSON spec, no?
> 
> Don’t entirely agree with this. Some folks are stuck with other encodings and
> cannot change them for one reason or another. That said, they can convert
> JSON from their required encoding into UTF-8 on the client side, so there is
> a workaround.

Perhaps in addition to trying to just 'do the right thing by default',
it makes sense to have a two canonicalization functions?

Say: json_utf8() and json_ascii().

They could give the same output no matter what encoding was set? 

json_utf8 would give nice output where characters were canonicalized to 
native utf8 characters and json_ascii() would output only non-control
ascii characters literally and escape everything else or something
like that?

Garick

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