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package Encode::Alias;
use strict;
use warnings;
our $VERSION = do { my @r = ( q$Revision: 2.25 $ =~ /\d+/g ); sprintf "%d." . "%02d" x $#r, @r };
use constant DEBUG => !!$ENV{PERL_ENCODE_DEBUG};
use Exporter 'import';
# Public, encouraged API is exported by default
our @EXPORT =
qw (
define_alias
find_alias
);
our @Alias; # ordered matching list
our %Alias; # cached known aliases
sub find_alias {
my $class = shift;
my $find = shift;
unless ( exists $Alias{$find} ) {
$Alias{$find} = undef; # Recursion guard
for ( my $i = 0 ; $i < @Alias ; $i += 2 ) {
my $alias = $Alias[$i];
my $val = $Alias[ $i + 1 ];
my $new;
if ( ref($alias) eq 'Regexp' && $find =~ $alias ) {
DEBUG and warn "eval $val";
$new = eval $val;
DEBUG and $@ and warn "$val, $@";
}
elsif ( ref($alias) eq 'CODE' ) {
DEBUG and warn "$alias", "->", "($find)";
$new = $alias->($find);
}
elsif ( lc($find) eq lc($alias) ) {
$new = $val;
}
if ( defined($new) ) {
next if $new eq $find; # avoid (direct) recursion on bugs
DEBUG and warn "$alias, $new";
my $enc =
( ref($new) ) ? $new : Encode::find_encoding($new);
if ($enc) {
$Alias{$find} = $enc;
last;
}
}
}
# case insensitive search when canonical is not in all lowercase
# RT ticket #7835
unless ( $Alias{$find} ) {
my $lcfind = lc($find);
for my $name ( keys %Encode::Encoding, keys %Encode::ExtModule )
{
$lcfind eq lc($name) or next;
$Alias{$find} = Encode::find_encoding($name);
DEBUG and warn "$find => $name";
}
}
}
if (DEBUG) {
my $name;
if ( my $e = $Alias{$find} ) {
$name = $e->name;
}
else {
$name = "";
}
warn "find_alias($class, $find)->name = $name";
}
return $Alias{$find};
}
sub define_alias {
while (@_) {
my $alias = shift;
my $name = shift;
unshift( @Alias, $alias => $name ) # newer one has precedence
if defined $alias;
if ( ref($alias) ) {
# clear %Alias cache to allow overrides
my @a = keys %Alias;
for my $k (@a) {
if ( ref($alias) eq 'Regexp' && $k =~ $alias ) {
DEBUG and warn "delete \$Alias\{$k\}";
delete $Alias{$k};
}
elsif ( ref($alias) eq 'CODE' && $alias->($k) ) {
DEBUG and warn "delete \$Alias\{$k\}";
delete $Alias{$k};
}
}
}
elsif (defined $alias) {
DEBUG and warn "delete \$Alias\{$alias\}";
delete $Alias{$alias};
}
elsif (DEBUG) {
require Carp;
Carp::croak("undef \$alias");
}
}
}
# HACK: Encode must be used after define_alias is declarated as Encode calls define_alias
use Encode ();
# Allow latin-1 style names as well
# 0 1 2 3 4 5 6 7 8 9 10
our @Latin2iso = ( 0, 1, 2, 3, 4, 9, 10, 13, 14, 15, 16 );
# Allow winlatin1 style names as well
our %Winlatin2cp = (
'latin1' => 1252,
'latin2' => 1250,
'cyrillic' => 1251,
'greek' => 1253,
'turkish' => 1254,
'hebrew' => 1255,
'arabic' => 1256,
'baltic' => 1257,
'vietnamese' => 1258,
);
init_aliases();
sub undef_aliases {
@Alias = ();
%Alias = ();
}
sub init_aliases {
undef_aliases();
# Try all-lower-case version should all else fails
define_alias( qr/^(.*)$/ => '"\L$1"' );
# UTF/UCS stuff
define_alias( qr/^(unicode-1-1-)?UTF-?7$/i => '"UTF-7"' );
define_alias( qr/^UCS-?2-?LE$/i => '"UCS-2LE"' );
define_alias(
qr/^UCS-?2-?(BE)?$/i => '"UCS-2BE"',
qr/^UCS-?4-?(BE|LE|)?$/i => 'uc("UTF-32$1")',
qr/^iso-10646-1$/i => '"UCS-2BE"'
);
define_alias(
qr/^UTF-?(16|32)-?BE$/i => '"UTF-$1BE"',
qr/^UTF-?(16|32)-?LE$/i => '"UTF-$1LE"',
qr/^UTF-?(16|32)$/i => '"UTF-$1"',
);
# ASCII
define_alias( qr/^(?:US-?)ascii$/i => '"ascii"' );
define_alias( 'C' => 'ascii' );
define_alias( qr/\b(?:ISO[-_]?)?646(?:[-_]?US)?$/i => '"ascii"' );
# Allow variants of iso-8859-1 etc.
define_alias( qr/\biso[-_]?(\d+)[-_](\d+)$/i => '"iso-$1-$2"' );
# ISO-8859-8-I => ISO-8859-8
# https://en.wikipedia.org/wiki/ISO-8859-8-I
define_alias( qr/\biso[-_]8859[-_]8[-_]I$/i => '"iso-8859-8"' );
# At least HP-UX has these.
define_alias( qr/\biso8859(\d+)$/i => '"iso-8859-$1"' );
# More HP stuff.
define_alias(
qr/\b(?:hp-)?(arabic|greek|hebrew|kana|roman|thai|turkish)8$/i =>
'"${1}8"' );
# The Official name of ASCII.
define_alias( qr/\bANSI[-_]?X3\.4[-_]?1968$/i => '"ascii"' );
# This is a font issue, not an encoding issue.
# (The currency symbol of the Latin 1 upper half
# has been redefined as the euro symbol.)
define_alias( qr/^(.+)\@euro$/i => '"$1"' );
define_alias( qr/\b(?:iso[-_]?)?latin[-_]?(\d+)$/i =>
'defined $Encode::Alias::Latin2iso[$1] ? "iso-8859-$Encode::Alias::Latin2iso[$1]" : undef'
);
define_alias(
qr/\bwin(latin[12]|cyrillic|baltic|greek|turkish|
hebrew|arabic|baltic|vietnamese)$/ix =>
'"cp" . $Encode::Alias::Winlatin2cp{lc($1)}'
);
# Common names for non-latin preferred MIME names
define_alias(
'ascii' => 'US-ascii',
'cyrillic' => 'iso-8859-5',
'arabic' => 'iso-8859-6',
'greek' => 'iso-8859-7',
'hebrew' => 'iso-8859-8',
'thai' => 'iso-8859-11',
);
# RT #20781
define_alias(qr/\btis-?620\b/i => '"iso-8859-11"');
# At least AIX has IBM-NNN (surprisingly...) instead of cpNNN.
# And Microsoft has their own naming (again, surprisingly).
# And windows-* is registered in IANA!
define_alias(
qr/\b(?:cp|ibm|ms|windows)[-_ ]?(\d{2,4})$/i => '"cp$1"' );
# Sometimes seen with a leading zero.
# define_alias( qr/\bcp037\b/i => '"cp37"');
# Mac Mappings
# predefined in *.ucm; unneeded
# define_alias( qr/\bmacIcelandic$/i => '"macIceland"');
define_alias( qr/^(?:x[_-])?mac[_-](.*)$/i => '"mac$1"' );
# http://rt.cpan.org/Ticket/Display.html?id=36326
define_alias( qr/^macintosh$/i => '"MacRoman"' );
# https://rt.cpan.org/Ticket/Display.html?id=78125
define_alias( qr/^macce$/i => '"MacCentralEurRoman"' );
# Ououououou. gone. They are different!
# define_alias( qr/\bmacRomanian$/i => '"macRumanian"');
# Standardize on the dashed versions.
define_alias( qr/\bkoi8[\s\-_]*([ru])$/i => '"koi8-$1"' );
unless ($Encode::ON_EBCDIC) {
# for Encode::CN
define_alias( qr/\beuc.*cn$/i => '"euc-cn"' );
define_alias( qr/\bcn.*euc$/i => '"euc-cn"' );
# define_alias( qr/\bGB[- ]?(\d+)$/i => '"euc-cn"' )
# CP936 doesn't have vendor-addon for GBK, so they're identical.
define_alias( qr/^gbk$/i => '"cp936"' );
# This fixes gb2312 vs. euc-cn confusion, practically
define_alias( qr/\bGB[-_ ]?2312(?!-?raw)/i => '"euc-cn"' );
# for Encode::JP
define_alias( qr/\bjis$/i => '"7bit-jis"' );
define_alias( qr/\beuc.*jp$/i => '"euc-jp"' );
define_alias( qr/\bjp.*euc$/i => '"euc-jp"' );
define_alias( qr/\bujis$/i => '"euc-jp"' );
define_alias( qr/\bshift.*jis$/i => '"shiftjis"' );
define_alias( qr/\bsjis$/i => '"shiftjis"' );
define_alias( qr/\bwindows-31j$/i => '"cp932"' );
# for Encode::KR
define_alias( qr/\beuc.*kr$/i => '"euc-kr"' );
define_alias( qr/\bkr.*euc$/i => '"euc-kr"' );
# This fixes ksc5601 vs. euc-kr confusion, practically
define_alias( qr/(?:x-)?uhc$/i => '"cp949"' );
define_alias( qr/(?:x-)?windows-949$/i => '"cp949"' );
define_alias( qr/\bks_c_5601-1987$/i => '"cp949"' );
# for Encode::TW
define_alias( qr/\bbig-?5$/i => '"big5-eten"' );
define_alias( qr/\bbig5-?et(?:en)?$/i => '"big5-eten"' );
define_alias( qr/\btca[-_]?big5$/i => '"big5-eten"' );
define_alias( qr/\bbig5-?hk(?:scs)?$/i => '"big5-hkscs"' );
define_alias( qr/\bhk(?:scs)?[-_]?big5$/i => '"big5-hkscs"' );
}
# https://github.com/dankogai/p5-encode/issues/37
define_alias(qr/cp65000/i => '"UTF-7"');
define_alias(qr/cp65001/i => '"utf-8-strict"');
# utf8 is blessed :)
define_alias( qr/\bUTF-8$/i => '"utf-8-strict"' );
# At last, Map white space and _ to '-'
define_alias( qr/^([^\s_]+)[\s_]+([^\s_]*)$/i => '"$1-$2"' );
}
1;
__END__
# TODO: HP-UX '8' encodings arabic8 greek8 hebrew8 kana8 thai8 turkish8
# TODO: HP-UX '15' encodings japanese15 korean15 roi15
# TODO: Cyrillic encoding ISO-IR-111 (useful?)
# TODO: Armenian encoding ARMSCII-8
# TODO: Hebrew encoding ISO-8859-8-1
# TODO: Thai encoding TCVN
# TODO: Vietnamese encodings VPS
# TODO: Mac Asian+African encodings: Arabic Armenian Bengali Burmese
# ChineseSimp ChineseTrad Devanagari Ethiopic ExtArabic
# Farsi Georgian Gujarati Gurmukhi Hebrew Japanese
# Kannada Khmer Korean Laotian Malayalam Mongolian
# Oriya Sinhalese Symbol Tamil Telugu Tibetan Vietnamese
=head1 NAME
Encode::Alias - alias definitions to encodings
=head1 SYNOPSIS
use Encode;
use Encode::Alias;
define_alias( "newName" => ENCODING);
define_alias( qr/.../ => ENCODING);
define_alias( sub { return ENCODING if ...; } );
=head1 DESCRIPTION
Allows newName to be used as an alias for ENCODING. ENCODING may be
either the name of an encoding or an encoding object (as described
in L<Encode>).
Currently the first argument to define_alias() can be specified in the
following ways:
=over 4
=item As a simple string.
=item As a qr// compiled regular expression, e.g.:
define_alias( qr/^iso8859-(\d+)$/i => '"iso-8859-$1"' );
In this case, if I<ENCODING> is not a reference, it is C<eval>-ed
in order to allow C<$1> etc. to be substituted. The example is one
way to alias names as used in X11 fonts to the MIME names for the
iso-8859-* family. Note the double quotes inside the single quotes.
(or, you don't have to do this yourself because this example is predefined)
If you are using a regex here, you have to use the quotes as shown or
it won't work. Also note that regex handling is tricky even for the
experienced. Use this feature with caution.
=item As a code reference, e.g.:
define_alias( sub {shift =~ /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } );
The same effect as the example above in a different way. The coderef
takes the alias name as an argument and returns a canonical name on
success or undef if not. Note the second argument is ignored if provided.
Use this with even more caution than the regex version.
=back
=head3 Changes in code reference aliasing
As of Encode 1.87, the older form
define_alias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } );
no longer works.
Encode up to 1.86 internally used "local $_" to implement this older
form. But consider the code below;
use Encode;
$_ = "eeeee" ;
while (/(e)/g) {
my $utf = decode('aliased-encoding-name', $1);
print "position:",pos,"\n";
}
Prior to Encode 1.86 this fails because of "local $_".
=head2 Alias overloading
You can override predefined aliases by simply applying define_alias().
The new alias is always evaluated first, and when necessary,
define_alias() flushes the internal cache to make the new definition
available.
# redirect SHIFT_JIS to MS/IBM Code Page 932, which is a
# superset of SHIFT_JIS
define_alias( qr/shift.*jis$/i => '"cp932"' );
define_alias( qr/sjis$/i => '"cp932"' );
If you want to zap all predefined aliases, you can use
Encode::Alias->undef_aliases;
to do so. And
Encode::Alias->init_aliases;
gets the factory settings back.
Note that define_alias() will not be able to override the canonical name
of encodings. Encodings are first looked up by canonical name before
potential aliases are tried.
=head1 SEE ALSO
L<Encode>, L<Encode::Supported>
=cut