Unicode::EastAsianWidth

Section: User Contributed Perl Documentation (3)
Updated: 2019-07-26
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NAME

Unicode::EastAsianWidth - East Asian Width properties  

SYNOPSIS

    use Unicode::EastAsianWidth;

    $_ = chr(0x2010); # HYPHEN, an ambiguous-width character

    /\p{InEastAsianAmbiguous}/; # True
    /\p{InFullwidth}/;          # False

To mark ambiguous-width characters as InFullwidth:

    BEGIN { $Unicode::EastAsianWidth::EastAsian = 1; }
    use Unicode::EastAsianWidth;

    $_ = chr(0x2010); # HYPHEN, an ambiguous-width character
    /\p{InFullwidth}/;          # True

 

DESCRIPTION

This module provide user-defined Unicode properties that deal with width status of East Asian characters, as specified in <http://www.unicode.org/unicode/reports/tr11/>.

It exports the following functions to the caller's scope, to be used by Perl's Unicode matching system: "InEastAsianFullwidth", "InEastAsianHalfwidth", "InEastAsianAmbiguous", "InEastAsianNarrow" "InEastAsianWide", "InEastAsianNeutral".

In accord to TR11 cited above, two additional context-sensitive properties are exported: "InFullwidth" (union of "Fullwidth" and "Wide") and "InHalfwidth" (union of "Halfwidth", "Narrow" and "Neutral").

Ambiguous characters are treated by default as part of "InHalfwidth", but you can modify this behaviour by assigning a true value to $Unicode::EastAsianWidth::EastAsian at compile time within a "BEGIN" block before loading this module:

    BEGIN { $Unicode::EastAsianWidth::EastAsian = 1; }
    use Unicode::EastAsianWidth;

Setting $Unicode::EastAsianWidth::EastAsian at run-time used to work on Perl versions between 5.8 and 5.14 due to an implementation detail, but it will no longer work on Perl 5.16 and later versions, and hence is not recommended.  

SEE ALSO

perlunicode, <http://www.unicode.org/unicode/reports/tr11/>  

AUTHORS

唐鳳 <cpan@audreyt.org>  

CC0 1.0 Universal

To the extent possible under law, 唐鳳 has waived all copyright and related or neighboring rights to Unicode-EastAsianWidth.

This work is published from Taiwan.

<http://creativecommons.org/publicdomain/zero/1.0>  

POD ERRORS

Hey! The above document had some coding errors, which are explained below:
Around line 486:
Non-ASCII character seen before =encoding in '唐鳳'. Assuming UTF-8


 

Index

NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
AUTHORS
CC0 1.0 Universal
POD ERRORS
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