| 1 | package Encode::Alias;
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| 2 | use strict;
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| 3 | no warnings 'redefine';
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| 4 | use Encode;
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| 5 | our $VERSION = do { my @r = (q$Revision: 2.4 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
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| 6 | sub DEBUG () { 0 }
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| 7 |
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| 8 | use base qw(Exporter);
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| 9 |
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| 10 | # Public, encouraged API is exported by default
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| 11 |
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| 12 | our @EXPORT =
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| 13 | qw (
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| 14 | define_alias
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| 15 | find_alias
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| 16 | );
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| 17 |
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| 18 | our @Alias; # ordered matching list
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| 19 | our %Alias; # cached known aliases
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| 20 |
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| 21 | sub find_alias{
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| 22 | my $class = shift;
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| 23 | my $find = shift;
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| 24 | unless (exists $Alias{$find}) {
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| 25 | $Alias{$find} = undef; # Recursion guard
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| 26 | for (my $i=0; $i < @Alias; $i += 2){
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| 27 | my $alias = $Alias[$i];
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| 28 | my $val = $Alias[$i+1];
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| 29 | my $new;
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| 30 | if (ref($alias) eq 'Regexp' && $find =~ $alias){
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| 31 | DEBUG and warn "eval $val";
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| 32 | $new = eval $val;
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| 33 | DEBUG and $@ and warn "$val, $@";
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| 34 | }elsif (ref($alias) eq 'CODE'){
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| 35 | DEBUG and warn "$alias", "->", "($find)";
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| 36 | $new = $alias->($find);
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| 37 | }elsif (lc($find) eq lc($alias)){
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| 38 | $new = $val;
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| 39 | }
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| 40 | if (defined($new)){
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| 41 | next if $new eq $find; # avoid (direct) recursion on bugs
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| 42 | DEBUG and warn "$alias, $new";
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| 43 | my $enc = (ref($new)) ? $new : Encode::find_encoding($new);
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| 44 | if ($enc){
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| 45 | $Alias{$find} = $enc;
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| 46 | last;
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| 47 | }
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| 48 | }
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| 49 | }
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| 50 | # case insensitive search when canonical is not in all lowercase
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| 51 | # RT ticket #7835
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| 52 | unless ($Alias{$find}){
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| 53 | my $lcfind = lc($find);
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| 54 | for my $name (keys %Encode::Encoding, keys %Encode::ExtModule){
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| 55 | $lcfind eq lc($name) or next;
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| 56 | $Alias{$find} = Encode::find_encoding($name);
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| 57 | DEBUG and warn "$find => $name";
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| 58 | }
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| 59 | }
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| 60 | }
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| 61 | if (DEBUG){
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| 62 | my $name;
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| 63 | if (my $e = $Alias{$find}){
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| 64 | $name = $e->name;
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| 65 | }else{
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| 66 | $name = "";
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| 67 | }
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| 68 | warn "find_alias($class, $find)->name = $name";
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| 69 | }
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| 70 | return $Alias{$find};
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| 71 | }
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| 72 |
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| 73 | sub define_alias{
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| 74 | while (@_){
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| 75 | my ($alias,$name) = splice(@_,0,2);
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| 76 | unshift(@Alias, $alias => $name); # newer one has precedence
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| 77 | if (ref($alias)){
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| 78 | # clear %Alias cache to allow overrides
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| 79 | my @a = keys %Alias;
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| 80 | for my $k (@a){
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| 81 | if (ref($alias) eq 'Regexp' && $k =~ $alias){
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| 82 | DEBUG and warn "delete \$Alias\{$k\}";
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| 83 | delete $Alias{$k};
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| 84 | }
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| 85 | elsif (ref($alias) eq 'CODE'){
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| 86 | DEBUG and warn "delete \$Alias\{$k\}";
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| 87 | delete $Alias{$alias->($name)};
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| 88 | }
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| 89 | }
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| 90 | }else{
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| 91 | DEBUG and warn "delete \$Alias\{$alias\}";
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| 92 | delete $Alias{$alias};
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| 93 | }
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| 94 | }
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| 95 | }
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| 96 |
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| 97 | # Allow latin-1 style names as well
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| 98 | # 0 1 2 3 4 5 6 7 8 9 10
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| 99 | our @Latin2iso = ( 0, 1, 2, 3, 4, 9, 10, 13, 14, 15, 16 );
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| 100 | # Allow winlatin1 style names as well
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| 101 | our %Winlatin2cp = (
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| 102 | 'latin1' => 1252,
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| 103 | 'latin2' => 1250,
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| 104 | 'cyrillic' => 1251,
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| 105 | 'greek' => 1253,
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| 106 | 'turkish' => 1254,
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| 107 | 'hebrew' => 1255,
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| 108 | 'arabic' => 1256,
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| 109 | 'baltic' => 1257,
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| 110 | 'vietnamese' => 1258,
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| 111 | );
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| 112 |
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| 113 | init_aliases();
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| 114 |
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| 115 | sub undef_aliases{
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| 116 | @Alias = ();
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| 117 | %Alias = ();
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| 118 | }
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| 119 |
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| 120 | sub init_aliases
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| 121 | {
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| 122 | undef_aliases();
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| 123 | # Try all-lower-case version should all else fails
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| 124 | define_alias( qr/^(.*)$/ => '"\L$1"' );
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| 125 |
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| 126 | # UTF/UCS stuff
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| 127 | define_alias( qr/^UTF-?7$/i => '"UTF-7"');
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| 128 | define_alias( qr/^UCS-?2-?LE$/i => '"UCS-2LE"' );
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| 129 | define_alias( qr/^UCS-?2-?(BE)?$/i => '"UCS-2BE"',
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| 130 | qr/^UCS-?4-?(BE|LE)?$/i => 'uc("UTF-32$1")',
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| 131 | qr/^iso-10646-1$/i => '"UCS-2BE"' );
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| 132 | define_alias( qr/^UTF-?(16|32)-?BE$/i => '"UTF-$1BE"',
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| 133 | qr/^UTF-?(16|32)-?LE$/i => '"UTF-$1LE"',
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| 134 | qr/^UTF-?(16|32)$/i => '"UTF-$1"',
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| 135 | );
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| 136 | # ASCII
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| 137 | define_alias(qr/^(?:US-?)ascii$/i => '"ascii"');
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| 138 | define_alias('C' => 'ascii');
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| 139 | define_alias(qr/\bISO[-_]?646[-_]?US$/i => '"ascii"');
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| 140 | # Allow variants of iso-8859-1 etc.
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| 141 | define_alias( qr/\biso[-_]?(\d+)[-_](\d+)$/i => '"iso-$1-$2"' );
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| 142 |
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| 143 | # At least HP-UX has these.
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| 144 | define_alias( qr/\biso8859(\d+)$/i => '"iso-8859-$1"' );
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| 145 |
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| 146 | # More HP stuff.
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| 147 | define_alias( qr/\b(?:hp-)?(arabic|greek|hebrew|kana|roman|thai|turkish)8$/i => '"${1}8"' );
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| 148 |
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| 149 | # The Official name of ASCII.
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| 150 | define_alias( qr/\bANSI[-_]?X3\.4[-_]?1968$/i => '"ascii"' );
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| 151 |
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| 152 | # This is a font issue, not an encoding issue.
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| 153 | # (The currency symbol of the Latin 1 upper half
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| 154 | # has been redefined as the euro symbol.)
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| 155 | define_alias( qr/^(.+)\@euro$/i => '"$1"' );
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| 156 |
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| 157 | define_alias( qr/\b(?:iso[-_]?)?latin[-_]?(\d+)$/i
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| 158 | => 'defined $Encode::Alias::Latin2iso[$1] ? "iso-8859-$Encode::Alias::Latin2iso[$1]" : undef' );
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| 159 |
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| 160 | define_alias( qr/\bwin(latin[12]|cyrillic|baltic|greek|turkish|
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| 161 | hebrew|arabic|baltic|vietnamese)$/ix =>
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| 162 | '"cp" . $Encode::Alias::Winlatin2cp{lc($1)}' );
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| 163 |
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| 164 | # Common names for non-latin preferred MIME names
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| 165 | define_alias( 'ascii' => 'US-ascii',
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| 166 | 'cyrillic' => 'iso-8859-5',
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| 167 | 'arabic' => 'iso-8859-6',
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| 168 | 'greek' => 'iso-8859-7',
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| 169 | 'hebrew' => 'iso-8859-8',
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| 170 | 'thai' => 'iso-8859-11',
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| 171 | 'tis620' => 'iso-8859-11',
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| 172 | );
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| 173 |
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| 174 | # At least AIX has IBM-NNN (surprisingly...) instead of cpNNN.
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| 175 | # And Microsoft has their own naming (again, surprisingly).
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| 176 | # And windows-* is registered in IANA!
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| 177 | define_alias( qr/\b(?:cp|ibm|ms|windows)[-_ ]?(\d{2,4})$/i => '"cp$1"');
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| 178 |
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| 179 | # Sometimes seen with a leading zero.
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| 180 | # define_alias( qr/\bcp037\b/i => '"cp37"');
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| 181 |
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| 182 | # Mac Mappings
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| 183 | # predefined in *.ucm; unneeded
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| 184 | # define_alias( qr/\bmacIcelandic$/i => '"macIceland"');
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| 185 | define_alias( qr/^mac_(.*)$/i => '"mac$1"');
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| 186 | # Ououououou. gone. They are differente!
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| 187 | # define_alias( qr/\bmacRomanian$/i => '"macRumanian"');
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| 188 |
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| 189 | # Standardize on the dashed versions.
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| 190 | define_alias( qr/\bkoi8[\s\-_]*([ru])$/i => '"koi8-$1"' );
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| 191 |
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| 192 | unless ($Encode::ON_EBCDIC){
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| 193 | # for Encode::CN
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| 194 | define_alias( qr/\beuc.*cn$/i => '"euc-cn"' );
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| 195 | define_alias( qr/\bcn.*euc$/i => '"euc-cn"' );
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| 196 | # define_alias( qr/\bGB[- ]?(\d+)$/i => '"euc-cn"' )
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| 197 | # CP936 doesn't have vendor-addon for GBK, so they're identical.
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| 198 | define_alias( qr/^gbk$/i => '"cp936"');
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| 199 | # This fixes gb2312 vs. euc-cn confusion, practically
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| 200 | define_alias( qr/\bGB[-_ ]?2312(?!-?raw)/i => '"euc-cn"' );
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| 201 | # for Encode::JP
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| 202 | define_alias( qr/\bjis$/i => '"7bit-jis"' );
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| 203 | define_alias( qr/\beuc.*jp$/i => '"euc-jp"' );
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| 204 | define_alias( qr/\bjp.*euc$/i => '"euc-jp"' );
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| 205 | define_alias( qr/\bujis$/i => '"euc-jp"' );
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| 206 | define_alias( qr/\bshift.*jis$/i => '"shiftjis"' );
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| 207 | define_alias( qr/\bsjis$/i => '"shiftjis"' );
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| 208 | define_alias( qr/\bwindows-31j$/i => '"cp932"' );
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| 209 | # for Encode::KR
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| 210 | define_alias( qr/\beuc.*kr$/i => '"euc-kr"' );
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| 211 | define_alias( qr/\bkr.*euc$/i => '"euc-kr"' );
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| 212 | # This fixes ksc5601 vs. euc-kr confusion, practically
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| 213 | define_alias( qr/(?:x-)?uhc$/i => '"cp949"' );
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| 214 | define_alias( qr/(?:x-)?windows-949$/i => '"cp949"' );
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| 215 | define_alias( qr/\bks_c_5601-1987$/i => '"cp949"' );
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| 216 | # for Encode::TW
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| 217 | define_alias( qr/\bbig-?5$/i => '"big5-eten"' );
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| 218 | define_alias( qr/\bbig5-?et(?:en)?$/i => '"big5-eten"' );
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| 219 | define_alias( qr/\btca[-_]?big5$/i => '"big5-eten"' );
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| 220 | define_alias( qr/\bbig5-?hk(?:scs)?$/i => '"big5-hkscs"' );
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| 221 | define_alias( qr/\bhk(?:scs)?[-_]?big5$/i => '"big5-hkscs"' );
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| 222 | }
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| 223 | # utf8 is blessed :)
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| 224 | define_alias( qr/^UTF-8$/i => '"utf-8-strict"');
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| 225 | # At last, Map white space and _ to '-'
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| 226 | define_alias( qr/^(\S+)[\s_]+(.*)$/i => '"$1-$2"' );
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| 227 | }
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| 228 |
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| 229 | 1;
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| 230 | __END__
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| 231 |
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| 232 | # TODO: HP-UX '8' encodings arabic8 greek8 hebrew8 kana8 thai8 turkish8
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| 233 | # TODO: HP-UX '15' encodings japanese15 korean15 roi15
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| 234 | # TODO: Cyrillic encoding ISO-IR-111 (useful?)
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| 235 | # TODO: Armenian encoding ARMSCII-8
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| 236 | # TODO: Hebrew encoding ISO-8859-8-1
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| 237 | # TODO: Thai encoding TCVN
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| 238 | # TODO: Vietnamese encodings VPS
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| 239 | # TODO: Mac Asian+African encodings: Arabic Armenian Bengali Burmese
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| 240 | # ChineseSimp ChineseTrad Devanagari Ethiopic ExtArabic
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| 241 | # Farsi Georgian Gujarati Gurmukhi Hebrew Japanese
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| 242 | # Kannada Khmer Korean Laotian Malayalam Mongolian
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| 243 | # Oriya Sinhalese Symbol Tamil Telugu Tibetan Vietnamese
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| 244 |
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| 245 | =head1 NAME
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| 246 |
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| 247 | Encode::Alias - alias definitions to encodings
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| 248 |
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| 249 | =head1 SYNOPSIS
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| 250 |
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| 251 | use Encode;
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| 252 | use Encode::Alias;
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| 253 | define_alias( newName => ENCODING);
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| 254 |
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| 255 | =head1 DESCRIPTION
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| 256 |
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| 257 | Allows newName to be used as an alias for ENCODING. ENCODING may be
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| 258 | either the name of an encoding or an encoding object (as described
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| 259 | in L<Encode>).
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| 260 |
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| 261 | Currently I<newName> can be specified in the following ways:
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| 262 |
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| 263 | =over 4
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| 264 |
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| 265 | =item As a simple string.
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| 266 |
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| 267 | =item As a qr// compiled regular expression, e.g.:
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| 268 |
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| 269 | define_alias( qr/^iso8859-(\d+)$/i => '"iso-8859-$1"' );
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| 270 |
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| 271 | In this case, if I<ENCODING> is not a reference, it is C<eval>-ed
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| 272 | in order to allow C<$1> etc. to be substituted. The example is one
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| 273 | way to alias names as used in X11 fonts to the MIME names for the
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| 274 | iso-8859-* family. Note the double quotes inside the single quotes.
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| 275 |
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| 276 | (or, you don't have to do this yourself because this example is predefined)
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| 277 |
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| 278 | If you are using a regex here, you have to use the quotes as shown or
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| 279 | it won't work. Also note that regex handling is tricky even for the
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| 280 | experienced. Use this feature with caution.
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| 281 |
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| 282 | =item As a code reference, e.g.:
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| 283 |
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| 284 | define_alias( sub {shift =~ /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } );
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| 285 |
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| 286 | The same effect as the example above in a different way. The coderef
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| 287 | takes the alias name as an argument and returns a canonical name on
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| 288 | success or undef if not. Note the second argument is not required.
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| 289 | Use this with even more caution than the regex version.
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| 290 |
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| 291 | =back
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| 292 |
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| 293 | =head3 Changes in code reference aliasing
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| 294 |
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| 295 | As of Encode 1.87, the older form
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| 296 |
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| 297 | define_alias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } );
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| 298 |
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| 299 | no longer works.
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| 300 |
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| 301 | Encode up to 1.86 internally used "local $_" to implement ths older
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| 302 | form. But consider the code below;
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| 303 |
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| 304 | use Encode;
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| 305 | $_ = "eeeee" ;
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| 306 | while (/(e)/g) {
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| 307 | my $utf = decode('aliased-encoding-name', $1);
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| 308 | print "position:",pos,"\n";
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| 309 | }
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| 310 |
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| 311 | Prior to Encode 1.86 this fails because of "local $_".
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| 312 |
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| 313 | =head2 Alias overloading
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| 314 |
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| 315 | You can override predefined aliases by simply applying define_alias().
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| 316 | The new alias is always evaluated first, and when necessary,
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| 317 | define_alias() flushes the internal cache to make the new definition
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| 318 | available.
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| 319 |
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| 320 | # redirect SHIFT_JIS to MS/IBM Code Page 932, which is a
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| 321 | # superset of SHIFT_JIS
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| 322 |
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| 323 | define_alias( qr/shift.*jis$/i => '"cp932"' );
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| 324 | define_alias( qr/sjis$/i => '"cp932"' );
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| 325 |
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| 326 | If you want to zap all predefined aliases, you can use
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| 327 |
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| 328 | Encode::Alias->undef_aliases;
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| 329 |
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| 330 | to do so. And
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| 331 |
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| 332 | Encode::Alias->init_aliases;
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| 333 |
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| 334 | gets the factory settings back.
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| 335 |
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| 336 | =head1 SEE ALSO
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| 337 |
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| 338 | L<Encode>, L<Encode::Supported>
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| 339 |
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| 340 | =cut
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| 341 |
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