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
