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1 | package Encode::Alias; |
2 | use strict; |
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3 | use Encode; |
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4 | our $VERSION = do { my @r = (q$Revision: 1.25 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r }; |
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5 | our $DEBUG = 0; |
6 | require Exporter; |
7 | |
8 | our @ISA = qw(Exporter); |
9 | |
10 | # Public, encouraged API is exported by default |
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11 | |
12 | our @EXPORT = |
13 | qw ( |
14 | define_alias |
15 | find_alias |
16 | ); |
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17 | |
18 | our @Alias; # ordered matching list |
19 | our %Alias; # cached known aliases |
20 | |
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21 | sub find_alias |
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22 | { |
23 | my $class = shift; |
24 | local $_ = shift; |
25 | unless (exists $Alias{$_}) |
26 | { |
27 | for (my $i=0; $i < @Alias; $i += 2) |
28 | { |
29 | my $alias = $Alias[$i]; |
30 | my $val = $Alias[$i+1]; |
31 | my $new; |
32 | if (ref($alias) eq 'Regexp' && $_ =~ $alias) |
33 | { |
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34 | $DEBUG and warn "eval $val"; |
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35 | $new = eval $val; |
36 | # $@ and warn "$val, $@"; |
37 | } |
38 | elsif (ref($alias) eq 'CODE') |
39 | { |
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40 | $DEBUG and warn "$alias", "->", "($val)"; |
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41 | $new = $alias->($val); |
42 | } |
43 | elsif (lc($_) eq lc($alias)) |
44 | { |
45 | $new = $val; |
46 | } |
47 | if (defined($new)) |
48 | { |
49 | next if $new eq $_; # avoid (direct) recursion on bugs |
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50 | $DEBUG and warn "$alias, $new"; |
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51 | my $enc = (ref($new)) ? $new : Encode::find_encoding($new); |
52 | if ($enc) |
53 | { |
54 | $Alias{$_} = $enc; |
55 | last; |
56 | } |
57 | } |
58 | } |
59 | } |
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60 | if ($DEBUG){ |
61 | my $name; |
62 | if (my $e = $Alias{$_}){ |
63 | $name = $e->name; |
64 | }else{ |
65 | $name = ""; |
66 | } |
67 | warn "find_alias($class, $_)->name = $name"; |
68 | } |
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69 | return $Alias{$_}; |
70 | } |
71 | |
72 | sub define_alias |
73 | { |
74 | while (@_) |
75 | { |
76 | my ($alias,$name) = splice(@_,0,2); |
77 | unshift(@Alias, $alias => $name); # newer one has precedence |
78 | # clear %Alias cache to allow overrides |
79 | if (ref($alias)){ |
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80 | my @a = keys %Alias; |
81 | for my $k (@a){ |
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82 | if (ref($alias) eq 'Regexp' && $k =~ $alias) |
83 | { |
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84 | $DEBUG and warn "delete \$Alias\{$k\}"; |
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85 | delete $Alias{$k}; |
86 | } |
87 | elsif (ref($alias) eq 'CODE') |
88 | { |
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89 | $DEBUG and warn "delete \$Alias\{$k\}"; |
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90 | delete $Alias{$alias->($name)}; |
91 | } |
92 | } |
93 | }else{ |
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94 | $DEBUG and warn "delete \$Alias\{$alias\}"; |
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95 | delete $Alias{$alias}; |
96 | } |
97 | } |
98 | } |
99 | |
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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 ); |
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103 | # Allow winlatin1 style names as well |
104 | our %Winlatin2cp = ( |
105 | 'latin1' => 1252, |
106 | 'latin2' => 1250, |
107 | 'cyrillic' => 1251, |
108 | 'greek' => 1253, |
109 | 'turkish' => 1254, |
110 | 'hebrew' => 1255, |
111 | 'arabic' => 1256, |
112 | 'baltic' => 1257, |
113 | 'vietnamese' => 1258, |
114 | ); |
115 | |
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116 | init_aliases(); |
117 | |
118 | sub undef_aliases{ |
119 | @Alias = (); |
120 | %Alias = (); |
121 | } |
122 | |
123 | sub init_aliases |
124 | { |
125 | undef_aliases(); |
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126 | |
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127 | # Try all-lower-case version should all else fails |
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128 | define_alias( qr/^(.*)$/ => '"\L$1"' ); |
129 | |
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130 | # UTF/UCS stuff |
131 | define_alias( qr/^UCS-?2-?LE$/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-$1"', |
137 | ); |
138 | # ASCII |
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139 | define_alias(qr/^(?:US-?)ascii$/i => '"ascii"'); |
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140 | define_alias('C' => 'ascii'); |
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141 | # Allow variants of iso-8859-1 etc. |
142 | define_alias( qr/\biso[-_]?(\d+)[-_](\d+)$/i => '"iso-$1-$2"' ); |
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143 | |
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144 | # At least HP-UX has these. |
145 | define_alias( qr/\biso8859(\d+)$/i => '"iso-8859-$1"' ); |
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146 | |
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147 | # More HP stuff. |
148 | define_alias( qr/\b(?:hp-)?(arabic|greek|hebrew|kana|roman|thai|turkish)8$/i => '"${1}8"' ); |
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149 | |
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150 | # The Official name of ASCII. |
151 | define_alias( qr/\bANSI[-_]?X3\.4[-_]?1968$/i => '"ascii"' ); |
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152 | |
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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.) |
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156 | define_alias( qr/^(.+)\@euro$/i => '"$1"' ); |
157 | |
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158 | define_alias( qr/\b(?:iso[-_]?)?latin[-_]?(\d+)$/i |
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159 | => '"iso-8859-$Encode::Alias::Latin2iso[$1]"' ); |
160 | |
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161 | define_alias( qr/\bwin(latin[12]|cyrillic|baltic|greek|turkish| |
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162 | hebrew|arabic|baltic|vietnamese)$/ix => |
163 | '"cp" . $Encode::Alias::Winlatin2cp{lc($1)}' ); |
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164 | |
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165 | # Common names for non-latin prefered MIME names |
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166 | define_alias( 'ascii' => 'US-ascii', |
167 | 'cyrillic' => 'iso-8859-5', |
168 | 'arabic' => 'iso-8859-6', |
169 | 'greek' => 'iso-8859-7', |
170 | 'hebrew' => 'iso-8859-8', |
171 | 'thai' => 'iso-8859-11', |
172 | 'tis620' => 'iso-8859-11', |
173 | ); |
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174 | |
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175 | # At least AIX has IBM-NNN (surprisingly...) instead of cpNNN. |
176 | # And Microsoft has their own naming (again, surprisingly). |
177 | # And windows-* is registered in IANA! |
178 | define_alias( qr/\b(?:ibm|ms|windows)[-_]?(\d\d\d\d?)$/i => '"cp$1"'); |
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179 | |
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180 | # Sometimes seen with a leading zero. |
181 | define_alias( qr/\bcp037\b/i => '"cp37"'); |
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182 | |
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183 | # Mac Mappings |
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184 | # predefined in *.ucm; unneeded |
185 | # define_alias( qr/\bmacIcelandic$/i => '"macIceland"'); |
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186 | define_alias( qr/^mac_(.*)$/i => '"mac$1"'); |
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187 | # Ououououou. gone. They are differente! |
188 | # define_alias( qr/\bmacRomanian$/i => '"macRumanian"'); |
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189 | |
190 | # Standardize on the dashed versions. |
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191 | # define_alias( qr/\butf8$/i => 'utf-8' ); |
192 | define_alias( qr/\bkoi8r$/i => 'koi8-r' ); |
193 | define_alias( qr/\bkoi8u$/i => 'koi8-u' ); |
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194 | |
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195 | unless ($Encode::ON_EBCDIC){ |
196 | # for Encode::CN |
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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"' ); |
204 | # for Encode::JP |
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"' ); |
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211 | # for Encode::KR |
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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$/i => '"cp949"' ); |
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218 | # for Encode::TW |
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219 | define_alias( qr/\bbig-?5$/i => '"big5"' ); |
220 | define_alias( qr/\bbig5-hk(?:scs)?$/i => '"big5-hkscs"' ); |
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221 | } |
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222 | # utf8 is blessed :) |
223 | define_alias( qr/^UTF-8$/i => '"utf8"',); |
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224 | # At last, Map white space and _ to '-' |
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225 | define_alias( qr/^(\S+)[\s_]+(.*)$/i => '"$1-$2"' ); |
226 | } |
227 | |
228 | 1; |
229 | __END__ |
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230 | |
231 | # TODO: HP-UX '8' encodings arabic8 greek8 hebrew8 kana8 thai8 turkish8 |
232 | # TODO: HP-UX '15' encodings japanese15 korean15 roi15 |
233 | # TODO: Cyrillic encoding ISO-IR-111 (useful?) |
234 | # TODO: Armenian encoding ARMSCII-8 |
235 | # TODO: Hebrew encoding ISO-8859-8-1 |
236 | # TODO: Thai encoding TCVN |
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237 | # TODO: Vietnamese encodings VPS |
238 | # TODO: Mac Asian+African encodings: Arabic Armenian Bengali Burmese |
239 | # ChineseSimp ChineseTrad Devanagari Ethiopic ExtArabic |
240 | # Farsi Georgian Gujarati Gurmukhi Hebrew Japanese |
241 | # Kannada Khmer Korean Laotian Malayalam Mongolian |
242 | # Oriya Sinhalese Symbol Tamil Telugu Tibetan Vietnamese |
243 | |
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244 | =head1 NAME |
245 | |
246 | Encode::Alias - alias defintions to encodings |
247 | |
248 | =head1 SYNOPSIS |
249 | |
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250 | use Encode; |
251 | use Encode::Alias; |
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252 | define_alias( newName => ENCODING); |
253 | |
254 | =head1 DESCRIPTION |
255 | |
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256 | Allows newName to be used as an alias for ENCODING. ENCODING may be |
257 | either the name of an encoding or an encoding object (as described |
258 | in L<Encode>). |
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259 | |
260 | Currently I<newName> can be specified in the following ways: |
261 | |
262 | =over 4 |
263 | |
264 | =item As a simple string. |
265 | |
266 | =item As a qr// compiled regular expression, e.g.: |
267 | |
268 | define_alias( qr/^iso8859-(\d+)$/i => '"iso-8859-$1"' ); |
269 | |
270 | In this case if I<ENCODING> is not a reference it is C<eval>-ed to |
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271 | allow C<$1> etc. to be substituted. The example is one way to alias |
272 | names as used in X11 fonts to the MIME names for the iso-8859-* |
273 | family. Note the double quote inside the single quote. |
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274 | |
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275 | If you are using a regex here, you have to use the quotes as shown or |
276 | it won't work. Also note that regex handling is tricky even for the |
277 | experienced. Use it with caution. |
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278 | |
279 | =item As a code reference, e.g.: |
280 | |
281 | define_alias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } , ''); |
282 | |
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283 | |
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284 | In this case C<$_> 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 |
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286 | is another way to alias names as used in X11 fonts to the MIME names |
287 | for the iso-8859-* family. |
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288 | |
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289 | =back |
290 | |
291 | =head2 Alias overloading |
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292 | |
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293 | You can override predefined aliases by simply applying define_alias(). |
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294 | New alias is always evaluated first and when neccessary define_alias() |
295 | flushes internal cache to make new definition available. |
296 | |
297 | # redirect SHIFT_JIS to MS/IBM Code Page 932, which is a |
298 | # superset of SHIFT_JIS |
299 | |
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300 | define_alias( qr/shift.*jis$/i => '"cp932"' ); |
301 | define_alias( qr/sjis$/i => '"cp932"' ); |
302 | |
303 | If you want to zap all predefined aliases, you can |
304 | |
305 | Encode::Alias->undef_aliases; |
306 | |
307 | to do so. And |
308 | |
309 | Encode::Alias->init_aliases; |
310 | |
311 | gets factory setting back. |
312 | |
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313 | |
314 | =head1 SEE ALSO |
315 | |
316 | L<Encode>, L<Encode::Supported> |
317 | |
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318 | =cut |
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319 | |