4 our $VERSION = do { my @r = (q$Revision: 1.30 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
9 # Public, encouraged API is exported by default
17 our @Alias; # ordered matching list
18 our %Alias; # cached known aliases
24 unless (exists $Alias{$_})
26 $Alias{$_} = undef; # Recursion guard
27 for (my $i=0; $i < @Alias; $i += 2)
29 my $alias = $Alias[$i];
30 my $val = $Alias[$i+1];
32 if (ref($alias) eq 'Regexp' && $_ =~ $alias)
34 $DEBUG and warn "eval $val";
36 # $@ and warn "$val, $@";
38 elsif (ref($alias) eq 'CODE')
40 $DEBUG and warn "$alias", "->", "($val)";
41 $new = $alias->($val);
43 elsif (lc($_) eq lc($alias))
49 next if $new eq $_; # avoid (direct) recursion on bugs
50 $DEBUG and warn "$alias, $new";
51 my $enc = (ref($new)) ? $new : Encode::find_encoding($new);
62 if (my $e = $Alias{$_}){
67 warn "find_alias($class, $_)->name = $name";
76 my ($alias,$name) = splice(@_,0,2);
77 unshift(@Alias, $alias => $name); # newer one has precedence
78 # clear %Alias cache to allow overrides
82 if (ref($alias) eq 'Regexp' && $k =~ $alias)
84 $DEBUG and warn "delete \$Alias\{$k\}";
87 elsif (ref($alias) eq 'CODE')
89 $DEBUG and warn "delete \$Alias\{$k\}";
90 delete $Alias{$alias->($name)};
94 $DEBUG and warn "delete \$Alias\{$alias\}";
95 delete $Alias{$alias};
100 # Allow latin-1 style names as well
101 # 0 1 2 3 4 5 6 7 8 9 10
102 our @Latin2iso = ( 0, 1, 2, 3, 4, 9, 10, 13, 14, 15, 16 );
103 # Allow winlatin1 style names as well
113 'vietnamese' => 1258,
127 # Try all-lower-case version should all else fails
128 define_alias( qr/^(.*)$/ => '"\L$1"' );
131 define_alias( qr/^UCS-?2-?LE$/i => '"UCS-2LE"' );
132 define_alias( qr/^UCS-?2-?(BE)?$/i => '"UCS-2BE"',
133 qr/^iso-10646-1$/i => '"UCS-2BE"' );
134 define_alias( qr/^UTF(16|32)-?BE$/i => '"UTF-$1BE"',
135 qr/^UTF(16|32)-?LE$/i => '"UTF-$1LE"',
136 qr/^UTF(16|32)$/i => '"UTF-$1"',
139 define_alias(qr/^(?:US-?)ascii$/i => '"ascii"');
140 define_alias('C' => 'ascii');
141 # Allow variants of iso-8859-1 etc.
142 define_alias( qr/\biso[-_]?(\d+)[-_](\d+)$/i => '"iso-$1-$2"' );
144 # At least HP-UX has these.
145 define_alias( qr/\biso8859(\d+)$/i => '"iso-8859-$1"' );
148 define_alias( qr/\b(?:hp-)?(arabic|greek|hebrew|kana|roman|thai|turkish)8$/i => '"${1}8"' );
150 # The Official name of ASCII.
151 define_alias( qr/\bANSI[-_]?X3\.4[-_]?1968$/i => '"ascii"' );
153 # This is a font issue, not an encoding issue.
154 # (The currency symbol of the Latin 1 upper half
155 # has been redefined as the euro symbol.)
156 define_alias( qr/^(.+)\@euro$/i => '"$1"' );
158 define_alias( qr/\b(?:iso[-_]?)?latin[-_]?(\d+)$/i
159 => '"iso-8859-$Encode::Alias::Latin2iso[$1]"' );
161 define_alias( qr/\bwin(latin[12]|cyrillic|baltic|greek|turkish|
162 hebrew|arabic|baltic|vietnamese)$/ix =>
163 '"cp" . $Encode::Alias::Winlatin2cp{lc($1)}' );
165 # Common names for non-latin prefered MIME names
166 define_alias( 'ascii' => 'US-ascii',
167 'cyrillic' => 'iso-8859-5',
168 'arabic' => 'iso-8859-6',
169 'greek' => 'iso-8859-7',
170 'hebrew' => 'iso-8859-8',
171 'thai' => 'iso-8859-11',
172 'tis620' => 'iso-8859-11',
175 # At least AIX has IBM-NNN (surprisingly...) instead of cpNNN.
176 # And Microsoft has their own naming (again, surprisingly).
177 # And windows-* is registered in IANA!
178 define_alias( qr/\b(?:ibm|ms|windows)[-_]?(\d\d\d\d?)$/i => '"cp$1"');
180 # Sometimes seen with a leading zero.
181 # define_alias( qr/\bcp037\b/i => '"cp37"');
184 # predefined in *.ucm; unneeded
185 # define_alias( qr/\bmacIcelandic$/i => '"macIceland"');
186 define_alias( qr/^mac_(.*)$/i => '"mac$1"');
187 # Ououououou. gone. They are differente!
188 # define_alias( qr/\bmacRomanian$/i => '"macRumanian"');
190 # Standardize on the dashed versions.
191 # define_alias( qr/\butf8$/i => 'utf-8' );
192 define_alias( qr/\bkoi8r$/i => 'koi8-r' );
193 define_alias( qr/\bkoi8u$/i => 'koi8-u' );
195 unless ($Encode::ON_EBCDIC){
197 define_alias( qr/\beuc.*cn$/i => '"euc-cn"' );
198 define_alias( qr/\bcn.*euc$/i => '"euc-cn"' );
199 # define_alias( qr/\bGB[- ]?(\d+)$/i => '"euc-cn"' )
200 # CP936 doesn't have vendor-addon for GBK, so they're identical.
201 define_alias( qr/^gbk$/i => '"cp936"');
202 # This fixes gb2312 vs. euc-cn confusion, practically
203 define_alias( qr/\bGB[-_ ]?2312(?:\D.*$|$)/i => '"euc-cn"' );
205 define_alias( qr/\bjis$/i => '"7bit-jis"' );
206 define_alias( qr/\beuc.*jp$/i => '"euc-jp"' );
207 define_alias( qr/\bjp.*euc$/i => '"euc-jp"' );
208 define_alias( qr/\bujis$/i => '"euc-jp"' );
209 define_alias( qr/\bshift.*jis$/i => '"shiftjis"' );
210 define_alias( qr/\bsjis$/i => '"shiftjis"' );
212 define_alias( qr/\beuc.*kr$/i => '"euc-kr"' );
213 define_alias( qr/\bkr.*euc$/i => '"euc-kr"' );
214 # This fixes ksc5601 vs. euc-kr confusion, practically
215 define_alias( qr/(?:x-)?uhc$/i => '"cp949"' );
216 define_alias( qr/(?:x-)?windows-949$/i => '"cp949"' );
217 define_alias( qr/\bks_c_5601-1987$/i => '"cp949"' );
219 define_alias( qr/\bbig-?5$/i => '"big5-eten"' );
220 define_alias( qr/\bbig5-?et(?:en)$/i => '"big5-eten"' );
221 define_alias( qr/\bbig5-?hk(?:scs)?$/i => '"big5-hkscs"' );
224 define_alias( qr/^UTF-8$/i => '"utf8"',);
225 # At last, Map white space and _ to '-'
226 define_alias( qr/^(\S+)[\s_]+(.*)$/i => '"$1-$2"' );
232 # TODO: HP-UX '8' encodings arabic8 greek8 hebrew8 kana8 thai8 turkish8
233 # TODO: HP-UX '15' encodings japanese15 korean15 roi15
234 # TODO: Cyrillic encoding ISO-IR-111 (useful?)
235 # TODO: Armenian encoding ARMSCII-8
236 # TODO: Hebrew encoding ISO-8859-8-1
237 # TODO: Thai encoding TCVN
238 # TODO: Vietnamese encodings VPS
239 # TODO: Mac Asian+African encodings: Arabic Armenian Bengali Burmese
240 # ChineseSimp ChineseTrad Devanagari Ethiopic ExtArabic
241 # Farsi Georgian Gujarati Gurmukhi Hebrew Japanese
242 # Kannada Khmer Korean Laotian Malayalam Mongolian
243 # Oriya Sinhalese Symbol Tamil Telugu Tibetan Vietnamese
247 Encode::Alias - alias definitions to encodings
253 define_alias( newName => ENCODING);
257 Allows newName to be used as an alias for ENCODING. ENCODING may be
258 either the name of an encoding or an encoding object (as described
261 Currently I<newName> can be specified in the following ways:
265 =item As a simple string.
267 =item As a qr// compiled regular expression, e.g.:
269 define_alias( qr/^iso8859-(\d+)$/i => '"iso-8859-$1"' );
271 In this case, if I<ENCODING> is not a reference, it is C<eval>-ed
272 in order to allow C<$1> etc. to be substituted. The example is one
273 way to alias names as used in X11 fonts to the MIME names for the
274 iso-8859-* family. Note the double quotes inside the single quotes.
276 If you are using a regex here, you have to use the quotes as shown or
277 it won't work. Also note that regex handling is tricky even for the
278 experienced. Use it with caution.
280 =item As a code reference, e.g.:
282 define_alias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } , '');
284 In this case, C<$_> will be set to the name that is being looked up and
285 I<ENCODING> is passed to the sub as its first argument. The example
286 is another way to alias names as used in X11 fonts to the MIME names
287 for the iso-8859-* family.
291 =head2 Alias overloading
293 You can override predefined aliases by simply applying define_alias().
294 The new alias is always evaluated first, and when neccessary,
295 define_alias() flushes the internal cache to make the new definition
298 # redirect SHIFT_JIS to MS/IBM Code Page 932, which is a
299 # superset of SHIFT_JIS
301 define_alias( qr/shift.*jis$/i => '"cp932"' );
302 define_alias( qr/sjis$/i => '"cp932"' );
304 If you want to zap all predefined aliases, you can use
306 Encode::Alias->undef_aliases;
310 Encode::Alias->init_aliases;
312 gets the factory settings back.
316 L<Encode>, L<Encode::Supported>