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Re: idn.el and confusables.txt

From: Eli Zaretskii
Subject: Re: idn.el and confusables.txt
Date: Mon, 16 May 2011 15:38:38 +0300

> From: Ted Zlatanov <address@hidden>
> Date: Sun, 15 May 2011 07:14:47 -0500
> EZ> If we were to implement the full IDNA protocol, would the above be
> EZ> enough?  Or will we need additional information?
> Oh, all this has been for confusables (TR39) only.  IDNA and uni-idn.el
> will have their own needs!

Granted, but I was asking whether IDNA implementation will need
anything from confusables.txt beyond what we discussed.  That is, will
a mapping of a character to a string be all IDNA needs to use the
information in confusables.txt?

> IDNA is better described in http://unicode.org/reports/tr46/ and the
> links at the end of that document (a whole bunch of RFCs).  I'm not
> interested in implementing the IDNA code beyond supporting the current
> character set detection because I don't think IDNA is popular enough,
> but maybe Lennart and others want to do it.
> For further possible markchars.el functionality, take a look at
> http://www.unicode.org/reports/tr36/ (Unicode Security Considerations).
> It talks about the confusables issues, IDNA issues, and bidi issues
> among others.  It's a really good explanation of what security-related
> functionality is needed from the confusables char-table and potentially
> other places in Emacs.

Yes, I'm familiar with these specs, but I didn't try to design an
implementation of IDNA, so the answers to the above questions are not
clear to me.  If someone can explain how would an IDNA implementation
use confusables.txt, we could make sure that the tables we produce
from it will be good for IDNA as well, if and when someone will want
to implement it.

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