Maeda-san and the list members,
Thank you for raising this issue and sorry for not raising this myself.
On Oct 22, 2005, at 19:42 , Kaoru Maeda wrote:
If we find a lot of yen sign as zip-operator in the standard library,
we have a big question: "Give up either Perl6 or Windows. Which do
we abandon?"
And I suppose the answer would be "We have a lot of substitutes to
Perl6:
Ruby, Perl5, etc."
In Japan, yes is synonym to backslash. We wish to retain this legacy.
Zip-operator is far less important than regex-escape, string-
escape, and
take-reference operator.
To make the matter worse, there are not just one "yen sign" in
Unicode. Take a look at this.
¥ U+00A5 YEN SIGN
¥ U+FFE5 FULLWIDTH YEN SIGN
Tough they look and groks the same to human, computers handle them
differently. This happened when Unicode Consortium decided to make
BMP round-trippable against legacy encodings. They were distinct in
JIS standards, so happened Unicode.
Maybe we should avoid other symbols like this for sigils -- those not
in ASCII that have 'fullwidth' variations. q($) and q(\) are okay
(or too late) because they are already in ASCII. q(¥) should be
avoided because you can hardly tell the difference from q(¥) in the
display.
But this will also outlaw the cent sign. I have attached a list of
those affected. As you see, most are with ASCII equivalents but some
are not.
Dan the Man with Too Many Signs to Deal With
% grep FULLWIDTH /usr/local/lib/perl5/5.8.7/unicore/Name.pl | perl -
Mencoding=utf8 -aple '$_=chr(hex($F[0]))."\t".$_'
! FF01 FULLWIDTH EXCLAMATION MARK
" FF02 FULLWIDTH QUOTATION MARK
# FF03 FULLWIDTH NUMBER SIGN
$ FF04 FULLWIDTH DOLLAR SIGN
% FF05 FULLWIDTH PERCENT SIGN
& FF06 FULLWIDTH AMPERSAND
' FF07 FULLWIDTH APOSTROPHE
( FF08 FULLWIDTH LEFT PARENTHESIS
) FF09 FULLWIDTH RIGHT PARENTHESIS
* FF0A FULLWIDTH ASTERISK
+ FF0B FULLWIDTH PLUS SIGN
, FF0C FULLWIDTH COMMA
- FF0D FULLWIDTH HYPHEN-MINUS
. FF0E FULLWIDTH FULL STOP
/ FF0F FULLWIDTH SOLIDUS
0 FF10 FULLWIDTH DIGIT ZERO
1 FF11 FULLWIDTH DIGIT ONE
2 FF12 FULLWIDTH DIGIT TWO
3 FF13 FULLWIDTH DIGIT THREE
4 FF14 FULLWIDTH DIGIT FOUR
5 FF15 FULLWIDTH DIGIT FIVE
6 FF16 FULLWIDTH DIGIT SIX
7 FF17 FULLWIDTH DIGIT SEVEN
8 FF18 FULLWIDTH DIGIT EIGHT
9 FF19 FULLWIDTH DIGIT NINE
: FF1A FULLWIDTH COLON
; FF1B FULLWIDTH SEMICOLON
< FF1C FULLWIDTH LESS-THAN SIGN
= FF1D FULLWIDTH EQUALS SIGN
> FF1E FULLWIDTH GREATER-THAN SIGN
? FF1F FULLWIDTH QUESTION MARK
@ FF20 FULLWIDTH COMMERCIAL AT
A FF21 FULLWIDTH LATIN CAPITAL LETTER A
B FF22 FULLWIDTH LATIN CAPITAL LETTER B
C FF23 FULLWIDTH LATIN CAPITAL LETTER C
D FF24 FULLWIDTH LATIN CAPITAL LETTER D
E FF25 FULLWIDTH LATIN CAPITAL LETTER E
F FF26 FULLWIDTH LATIN CAPITAL LETTER F
G FF27 FULLWIDTH LATIN CAPITAL LETTER G
H FF28 FULLWIDTH LATIN CAPITAL LETTER H
I FF29 FULLWIDTH LATIN CAPITAL LETTER I
J FF2A FULLWIDTH LATIN CAPITAL LETTER J
K FF2B FULLWIDTH LATIN CAPITAL LETTER K
L FF2C FULLWIDTH LATIN CAPITAL LETTER L
M FF2D FULLWIDTH LATIN CAPITAL LETTER M
N FF2E FULLWIDTH LATIN CAPITAL LETTER N
O FF2F FULLWIDTH LATIN CAPITAL LETTER O
P FF30 FULLWIDTH LATIN CAPITAL LETTER P
Q FF31 FULLWIDTH LATIN CAPITAL LETTER Q
R FF32 FULLWIDTH LATIN CAPITAL LETTER R
S FF33 FULLWIDTH LATIN CAPITAL LETTER S
T FF34 FULLWIDTH LATIN CAPITAL LETTER T
U FF35 FULLWIDTH LATIN CAPITAL LETTER U
V FF36 FULLWIDTH LATIN CAPITAL LETTER V
W FF37 FULLWIDTH LATIN CAPITAL LETTER W
X FF38 FULLWIDTH LATIN CAPITAL LETTER X
Y FF39 FULLWIDTH LATIN CAPITAL LETTER Y
Z FF3A FULLWIDTH LATIN CAPITAL LETTER Z
[ FF3B FULLWIDTH LEFT SQUARE BRACKET
\ FF3C FULLWIDTH REVERSE SOLIDUS
] FF3D FULLWIDTH RIGHT SQUARE BRACKET
^ FF3E FULLWIDTH CIRCUMFLEX ACCENT
_ FF3F FULLWIDTH LOW LINE
` FF40 FULLWIDTH GRAVE ACCENT
a FF41 FULLWIDTH LATIN SMALL LETTER A
b FF42 FULLWIDTH LATIN SMALL LETTER B
c FF43 FULLWIDTH LATIN SMALL LETTER C
d FF44 FULLWIDTH LATIN SMALL LETTER D
e FF45 FULLWIDTH LATIN SMALL LETTER E
f FF46 FULLWIDTH LATIN SMALL LETTER F
g FF47 FULLWIDTH LATIN SMALL LETTER G
h FF48 FULLWIDTH LATIN SMALL LETTER H
i FF49 FULLWIDTH LATIN SMALL LETTER I
j FF4A FULLWIDTH LATIN SMALL LETTER J
k FF4B FULLWIDTH LATIN SMALL LETTER K
l FF4C FULLWIDTH LATIN SMALL LETTER L
m FF4D FULLWIDTH LATIN SMALL LETTER M
n FF4E FULLWIDTH LATIN SMALL LETTER N
o FF4F FULLWIDTH LATIN SMALL LETTER O
p FF50 FULLWIDTH LATIN SMALL LETTER P
q FF51 FULLWIDTH LATIN SMALL LETTER Q
r FF52 FULLWIDTH LATIN SMALL LETTER R
s FF53 FULLWIDTH LATIN SMALL LETTER S
t FF54 FULLWIDTH LATIN SMALL LETTER T
u FF55 FULLWIDTH LATIN SMALL LETTER U
v FF56 FULLWIDTH LATIN SMALL LETTER V
w FF57 FULLWIDTH LATIN SMALL LETTER W
x FF58 FULLWIDTH LATIN SMALL LETTER X
y FF59 FULLWIDTH LATIN SMALL LETTER Y
z FF5A FULLWIDTH LATIN SMALL LETTER Z
{ FF5B FULLWIDTH LEFT CURLY BRACKET
| FF5C FULLWIDTH VERTICAL LINE
} FF5D FULLWIDTH RIGHT CURLY BRACKET
~ FF5E FULLWIDTH TILDE
⦅ FF5F FULLWIDTH LEFT WHITE PARENTHESIS
⦆ FF60 FULLWIDTH RIGHT WHITE PARENTHESIS
¢ FFE0 FULLWIDTH CENT SIGN
£ FFE1 FULLWIDTH POUND SIGN
¬ FFE2 FULLWIDTH NOT SIGN
 ̄ FFE3 FULLWIDTH MACRON
¦ FFE4 FULLWIDTH BROKEN BAR
¥ FFE5 FULLWIDTH YEN SIGN
₩ FFE6 FULLWIDTH WON SIGN