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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: 1.29 $ =~ /\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 | |
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12 | our @EXPORT = |
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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 | { |
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27 | $Alias{$_} = undef; # Recursion guard |
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28 | for (my $i=0; $i < @Alias; $i += 2) |
29 | { |
30 | my $alias = $Alias[$i]; |
31 | my $val = $Alias[$i+1]; |
32 | my $new; |
33 | if (ref($alias) eq 'Regexp' && $_ =~ $alias) |
34 | { |
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35 | $DEBUG and warn "eval $val"; |
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36 | $new = eval $val; |
37 | # $@ and warn "$val, $@"; |
38 | } |
39 | elsif (ref($alias) eq 'CODE') |
40 | { |
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41 | $DEBUG and warn "$alias", "->", "($val)"; |
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42 | $new = $alias->($val); |
43 | } |
44 | elsif (lc($_) eq lc($alias)) |
45 | { |
46 | $new = $val; |
47 | } |
48 | if (defined($new)) |
49 | { |
50 | next if $new eq $_; # avoid (direct) recursion on bugs |
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51 | $DEBUG and warn "$alias, $new"; |
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52 | my $enc = (ref($new)) ? $new : Encode::find_encoding($new); |
53 | if ($enc) |
54 | { |
55 | $Alias{$_} = $enc; |
56 | last; |
57 | } |
58 | } |
59 | } |
60 | } |
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61 | if ($DEBUG){ |
62 | my $name; |
63 | if (my $e = $Alias{$_}){ |
64 | $name = $e->name; |
65 | }else{ |
66 | $name = ""; |
67 | } |
68 | warn "find_alias($class, $_)->name = $name"; |
69 | } |
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70 | return $Alias{$_}; |
71 | } |
72 | |
73 | sub define_alias |
74 | { |
75 | while (@_) |
76 | { |
77 | my ($alias,$name) = splice(@_,0,2); |
78 | unshift(@Alias, $alias => $name); # newer one has precedence |
79 | # clear %Alias cache to allow overrides |
80 | if (ref($alias)){ |
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81 | my @a = keys %Alias; |
82 | for my $k (@a){ |
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83 | if (ref($alias) eq 'Regexp' && $k =~ $alias) |
84 | { |
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85 | $DEBUG and warn "delete \$Alias\{$k\}"; |
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86 | delete $Alias{$k}; |
87 | } |
88 | elsif (ref($alias) eq 'CODE') |
89 | { |
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90 | $DEBUG and warn "delete \$Alias\{$k\}"; |
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91 | delete $Alias{$alias->($name)}; |
92 | } |
93 | } |
94 | }else{ |
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95 | $DEBUG and warn "delete \$Alias\{$alias\}"; |
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96 | delete $Alias{$alias}; |
97 | } |
98 | } |
99 | } |
100 | |
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101 | # Allow latin-1 style names as well |
102 | # 0 1 2 3 4 5 6 7 8 9 10 |
103 | our @Latin2iso = ( 0, 1, 2, 3, 4, 9, 10, 13, 14, 15, 16 ); |
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104 | # Allow winlatin1 style names as well |
105 | our %Winlatin2cp = ( |
106 | 'latin1' => 1252, |
107 | 'latin2' => 1250, |
108 | 'cyrillic' => 1251, |
109 | 'greek' => 1253, |
110 | 'turkish' => 1254, |
111 | 'hebrew' => 1255, |
112 | 'arabic' => 1256, |
113 | 'baltic' => 1257, |
114 | 'vietnamese' => 1258, |
115 | ); |
116 | |
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117 | init_aliases(); |
118 | |
119 | sub undef_aliases{ |
120 | @Alias = (); |
121 | %Alias = (); |
122 | } |
123 | |
124 | sub init_aliases |
125 | { |
126 | undef_aliases(); |
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127 | |
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128 | # Try all-lower-case version should all else fails |
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129 | define_alias( qr/^(.*)$/ => '"\L$1"' ); |
130 | |
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131 | # UTF/UCS stuff |
132 | define_alias( qr/^UCS-?2-?LE$/i => '"UCS-2LE"' ); |
133 | define_alias( qr/^UCS-?2-?(BE)?$/i => '"UCS-2BE"', |
134 | qr/^iso-10646-1$/i => '"UCS-2BE"' ); |
135 | define_alias( qr/^UTF(16|32)-?BE$/i => '"UTF-$1BE"', |
136 | qr/^UTF(16|32)-?LE$/i => '"UTF-$1LE"', |
137 | qr/^UTF(16|32)$/i => '"UTF-$1"', |
138 | ); |
139 | # ASCII |
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140 | define_alias(qr/^(?:US-?)ascii$/i => '"ascii"'); |
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141 | define_alias('C' => 'ascii'); |
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142 | # Allow variants of iso-8859-1 etc. |
143 | define_alias( qr/\biso[-_]?(\d+)[-_](\d+)$/i => '"iso-$1-$2"' ); |
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144 | |
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145 | # At least HP-UX has these. |
146 | define_alias( qr/\biso8859(\d+)$/i => '"iso-8859-$1"' ); |
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147 | |
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148 | # More HP stuff. |
149 | define_alias( qr/\b(?:hp-)?(arabic|greek|hebrew|kana|roman|thai|turkish)8$/i => '"${1}8"' ); |
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150 | |
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151 | # The Official name of ASCII. |
152 | define_alias( qr/\bANSI[-_]?X3\.4[-_]?1968$/i => '"ascii"' ); |
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153 | |
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154 | # This is a font issue, not an encoding issue. |
155 | # (The currency symbol of the Latin 1 upper half |
156 | # has been redefined as the euro symbol.) |
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157 | define_alias( qr/^(.+)\@euro$/i => '"$1"' ); |
158 | |
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159 | define_alias( qr/\b(?:iso[-_]?)?latin[-_]?(\d+)$/i |
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160 | => '"iso-8859-$Encode::Alias::Latin2iso[$1]"' ); |
161 | |
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162 | define_alias( qr/\bwin(latin[12]|cyrillic|baltic|greek|turkish| |
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163 | hebrew|arabic|baltic|vietnamese)$/ix => |
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164 | '"cp" . $Encode::Alias::Winlatin2cp{lc($1)}' ); |
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165 | |
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166 | # Common names for non-latin prefered MIME names |
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167 | define_alias( 'ascii' => 'US-ascii', |
168 | 'cyrillic' => 'iso-8859-5', |
169 | 'arabic' => 'iso-8859-6', |
170 | 'greek' => 'iso-8859-7', |
171 | 'hebrew' => 'iso-8859-8', |
172 | 'thai' => 'iso-8859-11', |
173 | 'tis620' => 'iso-8859-11', |
174 | ); |
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175 | |
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176 | # At least AIX has IBM-NNN (surprisingly...) instead of cpNNN. |
177 | # And Microsoft has their own naming (again, surprisingly). |
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178 | # And windows-* is registered in IANA! |
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179 | define_alias( qr/\b(?:ibm|ms|windows)[-_]?(\d\d\d\d?)$/i => '"cp$1"'); |
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180 | |
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181 | # Sometimes seen with a leading zero. |
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182 | # define_alias( qr/\bcp037\b/i => '"cp37"'); |
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183 | |
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184 | # Mac Mappings |
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185 | # predefined in *.ucm; unneeded |
186 | # define_alias( qr/\bmacIcelandic$/i => '"macIceland"'); |
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187 | define_alias( qr/^mac_(.*)$/i => '"mac$1"'); |
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188 | # Ououououou. gone. They are differente! |
189 | # define_alias( qr/\bmacRomanian$/i => '"macRumanian"'); |
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190 | |
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191 | # Standardize on the dashed versions. |
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192 | # define_alias( qr/\butf8$/i => 'utf-8' ); |
193 | define_alias( qr/\bkoi8r$/i => 'koi8-r' ); |
194 | define_alias( qr/\bkoi8u$/i => 'koi8-u' ); |
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195 | |
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196 | unless ($Encode::ON_EBCDIC){ |
197 | # for Encode::CN |
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198 | define_alias( qr/\beuc.*cn$/i => '"euc-cn"' ); |
199 | define_alias( qr/\bcn.*euc$/i => '"euc-cn"' ); |
200 | # define_alias( qr/\bGB[- ]?(\d+)$/i => '"euc-cn"' ) |
201 | # CP936 doesn't have vendor-addon for GBK, so they're identical. |
202 | define_alias( qr/^gbk$/i => '"cp936"'); |
203 | # This fixes gb2312 vs. euc-cn confusion, practically |
204 | define_alias( qr/\bGB[-_ ]?2312(?:\D.*$|$)/i => '"euc-cn"' ); |
205 | # for Encode::JP |
206 | define_alias( qr/\bjis$/i => '"7bit-jis"' ); |
207 | define_alias( qr/\beuc.*jp$/i => '"euc-jp"' ); |
208 | define_alias( qr/\bjp.*euc$/i => '"euc-jp"' ); |
209 | define_alias( qr/\bujis$/i => '"euc-jp"' ); |
210 | define_alias( qr/\bshift.*jis$/i => '"shiftjis"' ); |
211 | define_alias( qr/\bsjis$/i => '"shiftjis"' ); |
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212 | # for Encode::KR |
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213 | define_alias( qr/\beuc.*kr$/i => '"euc-kr"' ); |
214 | define_alias( qr/\bkr.*euc$/i => '"euc-kr"' ); |
215 | # This fixes ksc5601 vs. euc-kr confusion, practically |
216 | define_alias( qr/(?:x-)?uhc$/i => '"cp949"' ); |
217 | define_alias( qr/(?:x-)?windows-949$/i => '"cp949"' ); |
218 | define_alias( qr/\bks_c_5601-1987$/i => '"cp949"' ); |
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219 | # for Encode::TW |
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220 | define_alias( qr/\bbig-?5$/i => '"big5-eten"' ); |
221 | define_alias( qr/\bbig5-?et(?:en)$/i => '"big5-eten"' ); |
222 | define_alias( qr/\bbig5-?hk(?:scs)?$/i => '"big5-hkscs"' ); |
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223 | } |
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224 | # utf8 is blessed :) |
225 | define_alias( qr/^UTF-8$/i => '"utf8"',); |
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226 | # At last, Map white space and _ to '-' |
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227 | define_alias( qr/^(\S+)[\s_]+(.*)$/i => '"$1-$2"' ); |
228 | } |
229 | |
230 | 1; |
231 | __END__ |
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232 | |
233 | # TODO: HP-UX '8' encodings arabic8 greek8 hebrew8 kana8 thai8 turkish8 |
234 | # TODO: HP-UX '15' encodings japanese15 korean15 roi15 |
235 | # TODO: Cyrillic encoding ISO-IR-111 (useful?) |
236 | # TODO: Armenian encoding ARMSCII-8 |
237 | # TODO: Hebrew encoding ISO-8859-8-1 |
238 | # TODO: Thai encoding TCVN |
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239 | # TODO: Vietnamese encodings VPS |
240 | # TODO: Mac Asian+African encodings: Arabic Armenian Bengali Burmese |
241 | # ChineseSimp ChineseTrad Devanagari Ethiopic ExtArabic |
242 | # Farsi Georgian Gujarati Gurmukhi Hebrew Japanese |
243 | # Kannada Khmer Korean Laotian Malayalam Mongolian |
244 | # Oriya Sinhalese Symbol Tamil Telugu Tibetan Vietnamese |
245 | |
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246 | =head1 NAME |
247 | |
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248 | Encode::Alias - alias definitions to encodings |
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249 | |
250 | =head1 SYNOPSIS |
251 | |
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252 | use Encode; |
253 | use Encode::Alias; |
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254 | define_alias( newName => ENCODING); |
255 | |
256 | =head1 DESCRIPTION |
257 | |
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258 | Allows newName to be used as an alias for ENCODING. ENCODING may be |
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259 | either the name of an encoding or an encoding object (as described |
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260 | in L<Encode>). |
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261 | |
262 | Currently I<newName> can be specified in the following ways: |
263 | |
264 | =over 4 |
265 | |
266 | =item As a simple string. |
267 | |
268 | =item As a qr// compiled regular expression, e.g.: |
269 | |
270 | define_alias( qr/^iso8859-(\d+)$/i => '"iso-8859-$1"' ); |
271 | |
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272 | In this case, if I<ENCODING> is not a reference, it is C<eval>-ed |
273 | in order to allow C<$1> etc. to be substituted. The example is one |
274 | way to alias names as used in X11 fonts to the MIME names for the |
275 | iso-8859-* family. Note the double quotes inside the single quotes. |
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276 | |
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277 | If you are using a regex here, you have to use the quotes as shown or |
278 | it won't work. Also note that regex handling is tricky even for the |
279 | experienced. Use it with caution. |
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280 | |
281 | =item As a code reference, e.g.: |
282 | |
283 | define_alias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } , ''); |
284 | |
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285 | In this case, C<$_> will be set to the name that is being looked up and |
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286 | I<ENCODING> is passed to the sub as its first argument. The example |
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287 | is another way to alias names as used in X11 fonts to the MIME names |
288 | for the iso-8859-* family. |
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289 | |
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290 | =back |
291 | |
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292 | =head2 Alias overloading |
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293 | |
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294 | You can override predefined aliases by simply applying define_alias(). |
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295 | The new alias is always evaluated first, and when neccessary, |
296 | define_alias() flushes the internal cache to make the new definition |
297 | available. |
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298 | |
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299 | # redirect SHIFT_JIS to MS/IBM Code Page 932, which is a |
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300 | # superset of SHIFT_JIS |
301 | |
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302 | define_alias( qr/shift.*jis$/i => '"cp932"' ); |
303 | define_alias( qr/sjis$/i => '"cp932"' ); |
304 | |
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305 | If you want to zap all predefined aliases, you can use |
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306 | |
307 | Encode::Alias->undef_aliases; |
308 | |
309 | to do so. And |
310 | |
311 | Encode::Alias->init_aliases; |
312 | |
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313 | gets the factory settings back. |
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314 | |
315 | =head1 SEE ALSO |
316 | |
317 | L<Encode>, L<Encode::Supported> |
318 | |
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319 | =cut |
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320 | |