> The problem I am trying to point out is that the characters in _128{.a
fall
> in a no-man's land. They are ambiguous. Sometimes they are treated like
> 8-bit extended ASCII. Sometimes they are treated like UTF-8 compression
> characters.
I don't agree that _128{.a. fall into a no-man's land.
J text is utf8, so _128{.a. are ordinary bytes. They are not any kind of
characters, since they are not valid utf8.
Earlier versions of J (J5 and earlier?) treated them as 8-bit extended
ASCII, but this is no longer the case.
On Thu, Feb 27, 2014 at 3:14 PM, Don Guinn <[email protected]> wrote:
> Everybody wants to talk about handling APL characters. I'm for that too,
> but first we need to make it clear on how to handle UTF-8 or UTF-whatever.
> The problem I am trying to point out is that the characters in _128{.a fall
> in a no-man's land. They are ambiguous. Sometimes they are treated like
> 8-bit extended ASCII. Sometimes they are treated like UTF-8 compression
> characters.
>
> u,U
> þþ
> shows how display got confused. Is it supposed to display UTF-8? Or is it
> supposed to display 8-bit extended ASCII? Looks like it ran into an error
> attempting to display it as UTF-8 so it switched to 8-bit extended ASCII.
> ": output is always literal. So
> #":u,U
> 6
> a.i.":u,U
> 195 131 194 190 195 190
> switched all the 8-bit extended ASCII to UTF-8. But sometimes it just puts
> in � when it can't figure out what to do. Maybe it should have displayed
> the 8-bit extended ASCII instead. The trouble is that the character þ is
> ambiguous.
>
> The reason why 7 u: 254{a. is an error is because 7 u. specifically has
> UTF-8 or ASCII as a right argument. 254{a. is neither. It is what I have
> been calling 8-bit extended ASCII.
>
> Before we can even hope to effectively deal with APL characters we need to
> be very clear on how to handle UTF-8.
> ----------------------------------------------------------------------
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>
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