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Re: uninorm/nfc - Unicode version?


From: Simon Josefsson
Subject: Re: uninorm/nfc - Unicode version?
Date: Wed, 05 Jan 2011 01:51:26 +0100
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.2 (gnu/linux)

"Bruno Haible" <address@hidden> writes:

> Hi Simon,
>
>> The Unicode NFC stuff seems to be based on Unicode 5.1.0 tables -- would
>> it be possible to upgrade it to 5.2.0 or better 6.0.0?
>
> I'm usually a bit lazy about these upgrades, because these days, the
> changes between Unicode versions are not noticeable for 99% of the
> applications and the 99% of the users.
>
> But if you wish to have this upgrade, I can put aside a couple of
> hours of time in the next few weeks for it.

Hi Bruno.  There is no hurry, I'm mostly curious about what kind of
non-trivial changes there would be.  I know that between 5.2 and 6.0
there were some changes made that would affect a IDNA2008 implementation
for example.

The best would be if the process to re-generate the files were
documented, then I could generate them on the fly to test my code with a
5.1, 5.2 and 6.0 Unicode library, which would be useful for
compatibility and regression testing.

If there were significant changes in any _algorithm_, as opposed to data
tables, that would be interesting to know.  I recall the NFKC algorithm
changed slightly between Unicode 3.2.0 and the next version but
hopefully 5.1/5.2/6.0 doesn't see any changes like that any more.

Btw, I'm (finally) working on a IDNA2008 implementation, and it is using
your libunistring.

/Simon



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