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+package Encode::Alias;
+use strict;
+no warnings 'redefine';
+use Encode;
+our $VERSION = do { my @r = (q$Revision: 2.4 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
+sub DEBUG () { 0 }
+
+use base qw(Exporter);
+
+# 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 ($alias,$name) = splice(@_,0,2);
+ unshift(@Alias, $alias => $name); # newer one has precedence
+ if (ref($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($alias) eq 'CODE'){
+ DEBUG and warn "delete \$Alias\{$k\}";
+ delete $Alias{$alias->($name)};
+ }
+ }
+ }else{
+ DEBUG and warn "delete \$Alias\{$alias\}";
+ delete $Alias{$alias};
+ }
+ }
+}
+
+# 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$1"' );
+
+ # UTF/UCS stuff
+ define_alias( qr/^UTF-?7$/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/\bISO[-_]?646[-_]?US$/i => '"ascii"');
+ # Allow variants of iso-8859-1 etc.
+ define_alias( qr/\biso[-_]?(\d+)[-_](\d+)$/i => '"iso-$1-$2"' );
+
+ # At least HP-UX has these.
+ define_alias( qr/\biso8859(\d+)$/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($1)}' );
+
+ # Common names for non-latin preferred MIME names
+ define_alias( 'ascii' => 'US-ascii',
+ 'cyrillic' => 'iso-8859-5',
+ 'arabic' => 'iso-8859-6',
+ 'greek' => 'iso-8859-7',
+ 'hebrew' => 'iso-8859-8',
+ 'thai' => 'iso-8859-11',
+ 'tis620' => 'iso-8859-11',
+ );
+
+ # At least AIX has IBM-NNN (surprisingly...) instead of cpNNN.
+ # And Microsoft has their own naming (again, surprisingly).
+ # And windows-* is registered in IANA!
+ define_alias( qr/\b(?:cp|ibm|ms|windows)[-_ ]?(\d{2,4})$/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/^mac_(.*)$/i => '"mac$1"');
+ # Ououououou. gone. They are differente!
+ # define_alias( qr/\bmacRomanian$/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$/i => '"big5-hkscs"' );
+ }
+ # utf8 is blessed :)
+ define_alias( qr/^UTF-8$/i => '"utf-8-strict"');
+ # At last, Map white space and _ to '-'
+ define_alias( qr/^(\S+)[\s_]+(.*)$/i => '"$1-$2"' );
+}
+
+1;
+__END__
+
+# TODO: HP-UX '8' encodings arabic8 greek8 hebrew8 kana8 thai8 turkish8
+# TODO: HP-UX '15' encodings japanese15 korean15 roi15
+# TODO: Cyrillic encoding ISO-IR-111 (useful?)
+# TODO: Armenian encoding ARMSCII-8
+# TODO: Hebrew encoding ISO-8859-8-1
+# TODO: Thai encoding TCVN
+# TODO: Vietnamese encodings VPS
+# TODO: Mac Asian+African encodings: Arabic Armenian Bengali Burmese
+# ChineseSimp ChineseTrad Devanagari Ethiopic ExtArabic
+# Farsi Georgian Gujarati Gurmukhi Hebrew Japanese
+# Kannada Khmer Korean Laotian Malayalam Mongolian
+# Oriya Sinhalese Symbol Tamil Telugu Tibetan Vietnamese
+
+=head1 NAME
+
+Encode::Alias - alias definitions to encodings
+
+=head1 SYNOPSIS
+
+ use Encode;
+ use Encode::Alias;
+ define_alias( newName => ENCODING);
+
+=head1 DESCRIPTION
+
+Allows newName to be used as an alias for ENCODING. ENCODING may be
+either the name of an encoding or an encoding object (as described
+in L<Encode>).
+
+Currently I<newName> can be specified in the following ways:
+
+=over 4
+
+=item As a simple string.
+
+=item As a qr// compiled regular expression, e.g.:
+
+ define_alias( qr/^iso8859-(\d+)$/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-$1" : undef } );
+
+The same effect as the example above in a different way. The coderef
+takes the alias name as an argument and returns a canonical name on
+success or undef if not. Note the second argument is not required.
+Use this with even more caution than the regex version.
+
+=back
+
+=head3 Changes in code reference aliasing
+
+As of Encode 1.87, the older form
+
+ define_alias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } );
+
+no longer works.
+
+Encode up to 1.86 internally used "local $_" to implement ths 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.
+
+=head1 SEE ALSO
+
+L<Encode>, L<Encode::Supported>
+
+=cut
+