more accumulated cleanups

[p5sagit/p5-mst-13.2.git] / ext / Encode / JP / JP.pm

package Encode::JP;

BEGIN {
    if ( ord("A") == 193 ) {
        die "Encode::JP not supported on EBCDIC\n";
    }
}
use Encode;
our $VERSION = do { my @r = ( q$Revision: 2.2 $ =~ /\d+/g ); sprintf "%d." . "%02d" x $#r, @r };

use XSLoader;
XSLoader::load( __PACKAGE__, $VERSION );

use Encode::JP::JIS7;

1;
__END__

=head1 NAME

Encode::JP - Japanese Encodings

=head1 SYNOPSIS

    use Encode qw/encode decode/; 
    $euc_jp = encode("euc-jp", $utf8);   # loads Encode::JP implicitly
    $utf8   = decode("euc-jp", $euc_jp); # ditto

=head1 ABSTRACT

This module implements Japanese charset encodings.  Encodings
supported are as follows.

  Canonical   Alias		Description
  --------------------------------------------------------------------
  euc-jp      /\beuc.*jp$/i	EUC (Extended Unix Character)
              /\bjp.*euc/i   
          /\bujis$/i
  shiftjis    /\bshift.*jis$/i	Shift JIS (aka MS Kanji)
          /\bsjis$/i
  7bit-jis    /\bjis$/i		7bit JIS
  iso-2022-jp			ISO-2022-JP                  [RFC1468]
                = 7bit JIS with all Halfwidth Kana 
                  converted to Fullwidth
  iso-2022-jp-1			ISO-2022-JP-1                [RFC2237]
                                = ISO-2022-JP with JIS X 0212-1990
                  support.  See below
  MacJapanese	                Shift JIS + Apple vendor mappings
  cp932       /\bwindows-31j$/i Code Page 932
                                = Shift JIS + MS/IBM vendor mappings
  jis0201-raw                   JIS0201, raw format
  jis0208-raw                   JIS0201, raw format
  jis0212-raw                   JIS0201, raw format
  --------------------------------------------------------------------

=head1 DESCRIPTION

To find out how to use this module in detail, see L<Encode>.

=head1 Note on ISO-2022-JP(-1)?

ISO-2022-JP-1 (RFC2237) is a superset of ISO-2022-JP (RFC1468) which
adds support for JIS X 0212-1990.  That means you can use the same
code to decode to utf8 but not vice versa.

  $utf8 = decode('iso-2022-jp-1', $stream);

and

  $utf8 = decode('iso-2022-jp',   $stream);

yield the same result but

  $with_0212 = encode('iso-2022-jp-1', $utf8);

is now different from

  $without_0212 = encode('iso-2022-jp', $utf8 );

In the latter case, characters that map to 0212 are first converted
to U+3013 (0xA2AE in EUC-JP; a white square also known as 'Tofu' or
'geta mark') then fed to the decoding engine.  U+FFFD is not used,
in order to preserve text layout as much as possible.

=head1 BUGS

The ASCII region (0x00-0x7f) is preserved for all encodings, even
though this conflicts with mappings by the Unicode Consortium.  See

L<http://www.debian.or.jp/~kubota/unicode-symbols.html.en>

to find out why it is implemented that way.

=head1 SEE ALSO

L<Encode>

=cut