Re: Newbie's questions implementing the [IDNA]

Dear Adam,
On 02:11 11/12/02, Adam M. Costello said:
>"JFC (Jefsey) Morfin" <[email protected]> wrote:
> > if (ToASCII(nameprep(ToUnicode(ascii_text))) == ascii_text) babelname=true;
> > if (babelname) "iesg--ascii_text" will display in ASCII mode on most
> > of the systems while having been registered, and possibly TMed, as
> > ToUnicode(ascii_text).
>
>Your reference to "iesg--ascii_text" suggests that you expect ascii_text
>not to include the ACE prefix.  But in that case, ToUnicode(ascii_text)
>is simply ascii_text itself, because ToUnicode won't alter a string that
>doesn't begin with the ACE prefix.

True. I was interested in the general idea.

>which is roughly approximated by this test:
>
>     Punyencode(Nameprep(Punydecode(ascii_text))) == ascii_text

actually it is:
- punycode_encode ()  and punnycode_decode.()
- and I am not interested in nameprep but just in making
   sure the Unicode stay invarient as per Paull Hoffman's draft.
   so it would be Paul_Hoffman_invarient() if I am correct.

>which is similar in form to the test you proposed, but ToASCII is
>very different from Punyencode, and ToUnicode is very different from
>Punydecode.

I am only interested to knowi if such a program permits me to
correctly determine Unicode IDNs of which the

>IESG--ascii_text will be displayed in non-ASCII form by IDN-aware
>applications capable of displaying the characters, and will be displayed
>in ASCII form otherwise.

as "iesg--coca-cola.com" or "iesg--jonathan-cohen.net" or
"iesg--vint-cerf.org".

Thank you.
jfc