NAME
    Unicode::EastAsianWidth - East Asian Width properties

VERSION
    This document describes version 1.10 of Unicode::EastAsianWidth,
    released October 14, 2007.

SYNOPSIS
        use Unicode::EastAsianWidth;

        $_ = chr(0x2588); # FULL BLOCK, an ambiguous-width character

        /\p{InEastAsianAmbiguous}/; # true
        /\p{InFullwidth}/;          # false

        {
            local $Unicode::EastAsianWidth::EastAsian = 1;
            /\p{InFullwidth}/;      # true; only works on perl 5.8+
        }

DESCRIPTION
    This module provide user-defined Unicode properties that deal with East
    Asian characters' width status, 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.

CAVEATS
    Setting $Unicode::EastAsianWidth::EastAsian at run-time only works on
    Perl version 5.8 or above. Perl 5.6 users must use a BEGIN block to set
    it before the "use" statement:

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

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

AUTHORS
    Audrey Tang <cpan@audreyt.org>

COPYRIGHT
    Copyright 2002, 2003, 2007 by Audrey Tang <cpan@audreyt.org>.

    This software is released under the MIT license cited below.

  The "MIT" License
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    copy of this software and associated documentation files (the
    "Software"), to deal in the Software without restriction, including
    without limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so, subject to
    the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.