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1 | package Encode::Alias; |
2 | use strict; |
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3 | use warnings; |
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4 | no warnings 'redefine'; |
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5 | our $VERSION = do { my @r = ( q$Revision: 2.8 $ =~ /\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 | |
10 | # Public, encouraged API is exported by default |
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11 | |
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12 | our @EXPORT = |
13 | qw ( |
14 | define_alias |
15 | find_alias |
16 | ); |
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17 | |
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18 | our @Alias; # ordered matching list |
19 | our %Alias; # cached known aliases |
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20 | |
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21 | sub find_alias { |
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22 | require Encode; |
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23 | my $class = shift; |
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24 | my $find = shift; |
25 | unless ( exists $Alias{$find} ) { |
26 | $Alias{$find} = undef; # Recursion guard |
27 | for ( my $i = 0 ; $i < @Alias ; $i += 2 ) { |
28 | my $alias = $Alias[$i]; |
29 | my $val = $Alias[ $i + 1 ]; |
30 | my $new; |
31 | if ( ref($alias) eq 'Regexp' && $find =~ $alias ) { |
32 | DEBUG and warn "eval $val"; |
33 | $new = eval $val; |
34 | DEBUG and $@ and warn "$val, $@"; |
35 | } |
36 | elsif ( ref($alias) eq 'CODE' ) { |
37 | DEBUG and warn "$alias", "->", "($find)"; |
38 | $new = $alias->($find); |
39 | } |
40 | elsif ( lc($find) eq lc($alias) ) { |
41 | $new = $val; |
42 | } |
43 | if ( defined($new) ) { |
44 | next if $new eq $find; # avoid (direct) recursion on bugs |
45 | DEBUG and warn "$alias, $new"; |
46 | my $enc = |
47 | ( ref($new) ) ? $new : Encode::find_encoding($new); |
48 | if ($enc) { |
49 | $Alias{$find} = $enc; |
50 | last; |
51 | } |
52 | } |
53 | } |
54 | |
55 | # case insensitive search when canonical is not in all lowercase |
56 | # RT ticket #7835 |
57 | unless ( $Alias{$find} ) { |
58 | my $lcfind = lc($find); |
59 | for my $name ( keys %Encode::Encoding, keys %Encode::ExtModule ) |
60 | { |
61 | $lcfind eq lc($name) or next; |
62 | $Alias{$find} = Encode::find_encoding($name); |
63 | DEBUG and warn "$find => $name"; |
64 | } |
65 | } |
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66 | } |
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67 | if (DEBUG) { |
68 | my $name; |
69 | if ( my $e = $Alias{$find} ) { |
70 | $name = $e->name; |
71 | } |
72 | else { |
73 | $name = ""; |
74 | } |
75 | warn "find_alias($class, $find)->name = $name"; |
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76 | } |
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77 | return $Alias{$find}; |
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78 | } |
79 | |
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80 | sub define_alias { |
81 | while (@_) { |
82 | my ( $alias, $name ) = splice( @_, 0, 2 ); |
83 | unshift( @Alias, $alias => $name ); # newer one has precedence |
84 | if ( ref($alias) ) { |
85 | |
86 | # clear %Alias cache to allow overrides |
87 | my @a = keys %Alias; |
88 | for my $k (@a) { |
89 | if ( ref($alias) eq 'Regexp' && $k =~ $alias ) { |
90 | DEBUG and warn "delete \$Alias\{$k\}"; |
91 | delete $Alias{$k}; |
92 | } |
93 | elsif ( ref($alias) eq 'CODE' ) { |
94 | DEBUG and warn "delete \$Alias\{$k\}"; |
95 | delete $Alias{ $alias->($name) }; |
96 | } |
97 | } |
98 | } |
99 | else { |
100 | DEBUG and warn "delete \$Alias\{$alias\}"; |
101 | delete $Alias{$alias}; |
102 | } |
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103 | } |
104 | } |
105 | |
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106 | # Allow latin-1 style names as well |
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107 | # 0 1 2 3 4 5 6 7 8 9 10 |
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108 | our @Latin2iso = ( 0, 1, 2, 3, 4, 9, 10, 13, 14, 15, 16 ); |
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109 | |
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110 | # Allow winlatin1 style names as well |
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111 | our %Winlatin2cp = ( |
112 | 'latin1' => 1252, |
113 | 'latin2' => 1250, |
114 | 'cyrillic' => 1251, |
115 | 'greek' => 1253, |
116 | 'turkish' => 1254, |
117 | 'hebrew' => 1255, |
118 | 'arabic' => 1256, |
119 | 'baltic' => 1257, |
120 | 'vietnamese' => 1258, |
121 | ); |
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122 | |
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123 | init_aliases(); |
124 | |
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125 | sub undef_aliases { |
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126 | @Alias = (); |
127 | %Alias = (); |
128 | } |
129 | |
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130 | sub init_aliases { |
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131 | require Encode; |
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132 | undef_aliases(); |
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133 | |
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134 | # Try all-lower-case version should all else fails |
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135 | define_alias( qr/^(.*)$/ => '"\L$1"' ); |
136 | |
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137 | # UTF/UCS stuff |
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138 | define_alias( qr/^UTF-?7$/i => '"UTF-7"' ); |
139 | define_alias( qr/^UCS-?2-?LE$/i => '"UCS-2LE"' ); |
140 | define_alias( |
141 | qr/^UCS-?2-?(BE)?$/i => '"UCS-2BE"', |
142 | qr/^UCS-?4-?(BE|LE)?$/i => 'uc("UTF-32$1")', |
143 | qr/^iso-10646-1$/i => '"UCS-2BE"' |
144 | ); |
145 | define_alias( |
146 | qr/^UTF-?(16|32)-?BE$/i => '"UTF-$1BE"', |
147 | qr/^UTF-?(16|32)-?LE$/i => '"UTF-$1LE"', |
148 | qr/^UTF-?(16|32)$/i => '"UTF-$1"', |
149 | ); |
150 | |
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151 | # ASCII |
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152 | define_alias( qr/^(?:US-?)ascii$/i => '"ascii"' ); |
153 | define_alias( 'C' => 'ascii' ); |
154 | define_alias( qr/\bISO[-_]?646[-_]?US$/i => '"ascii"' ); |
155 | |
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156 | # Allow variants of iso-8859-1 etc. |
157 | define_alias( qr/\biso[-_]?(\d+)[-_](\d+)$/i => '"iso-$1-$2"' ); |
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158 | |
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159 | # At least HP-UX has these. |
160 | define_alias( qr/\biso8859(\d+)$/i => '"iso-8859-$1"' ); |
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161 | |
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162 | # More HP stuff. |
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163 | define_alias( |
164 | qr/\b(?:hp-)?(arabic|greek|hebrew|kana|roman|thai|turkish)8$/i => |
165 | '"${1}8"' ); |
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166 | |
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167 | # The Official name of ASCII. |
168 | define_alias( qr/\bANSI[-_]?X3\.4[-_]?1968$/i => '"ascii"' ); |
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169 | |
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170 | # This is a font issue, not an encoding issue. |
171 | # (The currency symbol of the Latin 1 upper half |
172 | # has been redefined as the euro symbol.) |
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173 | define_alias( qr/^(.+)\@euro$/i => '"$1"' ); |
174 | |
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175 | define_alias( qr/\b(?:iso[-_]?)?latin[-_]?(\d+)$/i => |
176 | 'defined $Encode::Alias::Latin2iso[$1] ? "iso-8859-$Encode::Alias::Latin2iso[$1]" : undef' |
177 | ); |
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178 | |
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179 | define_alias( |
180 | qr/\bwin(latin[12]|cyrillic|baltic|greek|turkish| |
181 | hebrew|arabic|baltic|vietnamese)$/ix => |
182 | '"cp" . $Encode::Alias::Winlatin2cp{lc($1)}' |
183 | ); |
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184 | |
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185 | # Common names for non-latin preferred MIME names |
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186 | define_alias( |
187 | 'ascii' => 'US-ascii', |
188 | 'cyrillic' => 'iso-8859-5', |
189 | 'arabic' => 'iso-8859-6', |
190 | 'greek' => 'iso-8859-7', |
191 | 'hebrew' => 'iso-8859-8', |
192 | 'thai' => 'iso-8859-11', |
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193 | ); |
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194 | # RT #20781 |
195 | define_alias(qr/\btis-?620\b/i => '"iso-8859-11"'); |
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196 | |
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197 | # At least AIX has IBM-NNN (surprisingly...) instead of cpNNN. |
198 | # And Microsoft has their own naming (again, surprisingly). |
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199 | # And windows-* is registered in IANA! |
200 | define_alias( |
201 | qr/\b(?:cp|ibm|ms|windows)[-_ ]?(\d{2,4})$/i => '"cp$1"' ); |
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202 | |
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203 | # Sometimes seen with a leading zero. |
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204 | # define_alias( qr/\bcp037\b/i => '"cp37"'); |
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205 | |
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206 | # Mac Mappings |
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207 | # predefined in *.ucm; unneeded |
208 | # define_alias( qr/\bmacIcelandic$/i => '"macIceland"'); |
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209 | define_alias( qr/^mac_(.*)$/i => '"mac$1"' ); |
210 | |
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211 | # Ououououou. gone. They are differente! |
212 | # define_alias( qr/\bmacRomanian$/i => '"macRumanian"'); |
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213 | |
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214 | # Standardize on the dashed versions. |
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215 | define_alias( qr/\bkoi8[\s\-_]*([ru])$/i => '"koi8-$1"' ); |
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216 | |
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217 | unless ($Encode::ON_EBCDIC) { |
218 | |
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219 | # for Encode::CN |
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220 | define_alias( qr/\beuc.*cn$/i => '"euc-cn"' ); |
221 | define_alias( qr/\bcn.*euc$/i => '"euc-cn"' ); |
222 | |
223 | # define_alias( qr/\bGB[- ]?(\d+)$/i => '"euc-cn"' ) |
224 | # CP936 doesn't have vendor-addon for GBK, so they're identical. |
225 | define_alias( qr/^gbk$/i => '"cp936"' ); |
226 | |
227 | # This fixes gb2312 vs. euc-cn confusion, practically |
228 | define_alias( qr/\bGB[-_ ]?2312(?!-?raw)/i => '"euc-cn"' ); |
229 | |
230 | # for Encode::JP |
231 | define_alias( qr/\bjis$/i => '"7bit-jis"' ); |
232 | define_alias( qr/\beuc.*jp$/i => '"euc-jp"' ); |
233 | define_alias( qr/\bjp.*euc$/i => '"euc-jp"' ); |
234 | define_alias( qr/\bujis$/i => '"euc-jp"' ); |
235 | define_alias( qr/\bshift.*jis$/i => '"shiftjis"' ); |
236 | define_alias( qr/\bsjis$/i => '"shiftjis"' ); |
237 | define_alias( qr/\bwindows-31j$/i => '"cp932"' ); |
238 | |
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239 | # for Encode::KR |
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240 | define_alias( qr/\beuc.*kr$/i => '"euc-kr"' ); |
241 | define_alias( qr/\bkr.*euc$/i => '"euc-kr"' ); |
242 | |
243 | # This fixes ksc5601 vs. euc-kr confusion, practically |
244 | define_alias( qr/(?:x-)?uhc$/i => '"cp949"' ); |
245 | define_alias( qr/(?:x-)?windows-949$/i => '"cp949"' ); |
246 | define_alias( qr/\bks_c_5601-1987$/i => '"cp949"' ); |
247 | |
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248 | # for Encode::TW |
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249 | define_alias( qr/\bbig-?5$/i => '"big5-eten"' ); |
250 | define_alias( qr/\bbig5-?et(?:en)?$/i => '"big5-eten"' ); |
251 | define_alias( qr/\btca[-_]?big5$/i => '"big5-eten"' ); |
252 | define_alias( qr/\bbig5-?hk(?:scs)?$/i => '"big5-hkscs"' ); |
253 | define_alias( qr/\bhk(?:scs)?[-_]?big5$/i => '"big5-hkscs"' ); |
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254 | } |
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255 | |
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256 | # utf8 is blessed :) |
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257 | define_alias( qr/^UTF-8$/i => '"utf-8-strict"' ); |
258 | |
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259 | # At last, Map white space and _ to '-' |
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260 | define_alias( qr/^(\S+)[\s_]+(.*)$/i => '"$1-$2"' ); |
261 | } |
262 | |
263 | 1; |
264 | __END__ |
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265 | |
266 | # TODO: HP-UX '8' encodings arabic8 greek8 hebrew8 kana8 thai8 turkish8 |
267 | # TODO: HP-UX '15' encodings japanese15 korean15 roi15 |
268 | # TODO: Cyrillic encoding ISO-IR-111 (useful?) |
269 | # TODO: Armenian encoding ARMSCII-8 |
270 | # TODO: Hebrew encoding ISO-8859-8-1 |
271 | # TODO: Thai encoding TCVN |
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272 | # TODO: Vietnamese encodings VPS |
273 | # TODO: Mac Asian+African encodings: Arabic Armenian Bengali Burmese |
274 | # ChineseSimp ChineseTrad Devanagari Ethiopic ExtArabic |
275 | # Farsi Georgian Gujarati Gurmukhi Hebrew Japanese |
276 | # Kannada Khmer Korean Laotian Malayalam Mongolian |
277 | # Oriya Sinhalese Symbol Tamil Telugu Tibetan Vietnamese |
278 | |
5d030b67 |
279 | =head1 NAME |
280 | |
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281 | Encode::Alias - alias definitions to encodings |
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282 | |
283 | =head1 SYNOPSIS |
284 | |
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285 | use Encode; |
286 | use Encode::Alias; |
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287 | define_alias( newName => ENCODING); |
288 | |
289 | =head1 DESCRIPTION |
290 | |
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291 | Allows newName to be used as an alias for ENCODING. ENCODING may be |
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292 | either the name of an encoding or an encoding object (as described |
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293 | in L<Encode>). |
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294 | |
295 | Currently I<newName> can be specified in the following ways: |
296 | |
297 | =over 4 |
298 | |
299 | =item As a simple string. |
300 | |
301 | =item As a qr// compiled regular expression, e.g.: |
302 | |
303 | define_alias( qr/^iso8859-(\d+)$/i => '"iso-8859-$1"' ); |
304 | |
0ab8f81e |
305 | In this case, if I<ENCODING> is not a reference, it is C<eval>-ed |
306 | in order to allow C<$1> etc. to be substituted. The example is one |
307 | way to alias names as used in X11 fonts to the MIME names for the |
308 | iso-8859-* family. Note the double quotes inside the single quotes. |
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309 | |
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310 | (or, you don't have to do this yourself because this example is predefined) |
311 | |
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312 | If you are using a regex here, you have to use the quotes as shown or |
313 | it won't work. Also note that regex handling is tricky even for the |
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314 | experienced. Use this feature with caution. |
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315 | |
316 | =item As a code reference, e.g.: |
317 | |
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318 | define_alias( sub {shift =~ /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } ); |
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319 | |
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320 | The same effect as the example above in a different way. The coderef |
321 | takes the alias name as an argument and returns a canonical name on |
322 | success or undef if not. Note the second argument is not required. |
323 | Use this with even more caution than the regex version. |
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324 | |
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325 | =back |
326 | |
151b5d36 |
327 | =head3 Changes in code reference aliasing |
328 | |
329 | As of Encode 1.87, the older form |
330 | |
331 | define_alias( sub { return /^iso8859-(\d+)$/i ? "iso-8859-$1" : undef } ); |
332 | |
333 | no longer works. |
334 | |
335 | Encode up to 1.86 internally used "local $_" to implement ths older |
336 | form. But consider the code below; |
337 | |
338 | use Encode; |
339 | $_ = "eeeee" ; |
340 | while (/(e)/g) { |
341 | my $utf = decode('aliased-encoding-name', $1); |
342 | print "position:",pos,"\n"; |
343 | } |
344 | |
345 | Prior to Encode 1.86 this fails because of "local $_". |
346 | |
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347 | =head2 Alias overloading |
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348 | |
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349 | You can override predefined aliases by simply applying define_alias(). |
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350 | The new alias is always evaluated first, and when necessary, |
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351 | define_alias() flushes the internal cache to make the new definition |
352 | available. |
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353 | |
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354 | # redirect SHIFT_JIS to MS/IBM Code Page 932, which is a |
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355 | # superset of SHIFT_JIS |
356 | |
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357 | define_alias( qr/shift.*jis$/i => '"cp932"' ); |
358 | define_alias( qr/sjis$/i => '"cp932"' ); |
359 | |
0ab8f81e |
360 | If you want to zap all predefined aliases, you can use |
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361 | |
362 | Encode::Alias->undef_aliases; |
363 | |
364 | to do so. And |
365 | |
366 | Encode::Alias->init_aliases; |
367 | |
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368 | gets the factory settings back. |
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369 | |
370 | =head1 SEE ALSO |
371 | |
372 | L<Encode>, L<Encode::Supported> |
373 | |
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374 | =cut |
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375 | |