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Content-type: text/plain
On Fri, 17 Sep 2004 19:27:04 +0100, Bob Walkden <bob{([at]})nowhere.xy
wrote:
snip
> CAP(CHR(247)) = CAP(÷) = ×
>
> There is no sense in which ÷ can be said to have a capital letter, as
> far as I know.
>
> Other Oberons do not have a character set as part of the specification of
> CAP, and none of them seems to specify the result of executing CAP on a
> character like ÷, for which there is no meaningful capital equivalent.
> Therefore, if you execute CAP with a non-letter character, all bets
> are off. This is rather unfortunate. It would have been better to
> define a result for the non-letter case. It should have returned
> either the same character that was input, or it should have returned a
> value such as 0X, indicating 'no corresponding capital'.
Thanks for writing. This my opinion as well.
And the other question I had in mind may not have shown clearly, as the
module I added was written in a little hurry. Here's a (hopefully) better
version:
MODULE PrivCapTest;
IMPORT
In, StdLog;
PROCEDURE Do*;
VAR
ch: CHAR;
i: INTEGER;
BEGIN
FOR i := ORD(MIN(CHAR)) TO ORD(MAX(SHORTCHAR)) DO
ch := CHR(i);
StdLog.Ln;
StdLog.String("CAP(CHR(");
StdLog.IntForm(i, 16, 0, 8FX, FALSE);
StdLog.String(")) = ");
StdLog.String("CAP(");
StdLog.Char(ch);
StdLog.String(") = ");
StdLog.Char(CAP(ch));
IF ch # CAP(ch) THEN
StdLog.String(" = ");
StdLog.String("CHR(");
StdLog.IntForm(ORD(CAP(CHR(i))), 16, 0, 8FX, FALSE);
StdLog.String(") ");
END;
END;
StdLog.Ln;
END Do;
END PrivCapTest.
This one shows the mappings of CAP in Hex-numbers. And on inspection it
really shows some logic. The blocks 00X to 1FX, 40X to 5FX, 80X to 9FX and
C0X to DFX are unchanged by CAP whereas the others are mapped on their
preceding blocks respectivly (e. g. 60X -> 40X and so on).
Whatever the implementation of this (non-) mapping may be, I can't imagine
that it really is a problem to change in the sense that blocks 20X to 3FX
and A0X to BFX stay unmapped as well.
I admit this will not solve the problem of having CAP(÷) = ×, but this
really is a matter of the unicode gang (or their predecessors) not one OMS
can solve. On the other side I believe OMS should be able to change CAP
the way I sugest without loss of efficiency as the action to be taken
still isn't anything else but bit-shifting. Or am I wrong?
Regards
Harro von Lavergne
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Received on Fri Sep 17 2004 - 21:02:39 UTC