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1 | <?php |
2 | /* | |
3 | * accept-to-gettext.inc -- convert information in 'Accept-*' headers to | |
4 | * gettext language identifiers. | |
5 | * Copyright (c) 2003, Wouter Verhelst <wouter@debian.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Usage: | |
22 | * | |
23 | * $locale=al2gt(<array of supported languages/charsets in gettext syntax>, | |
24 | * <MIME type of document>); | |
25 | * setlocale('LC_ALL', $locale); // or 'LC_MESSAGES', or whatever... | |
26 | * | |
27 | * Example: | |
28 | * | |
29 | * $langs=array('nl_BE.ISO-8859-15','nl_BE.UTF-8','en_US.UTF-8','en_GB.UTF-8'); | |
30 | * $locale=al2gt($langs, 'text/html'); | |
31 | * setlocale('LC_ALL', $locale); | |
32 | * | |
33 | * Note that this will send out header information (to be | |
34 | * RFC2616-compliant), so it must be called before anything is sent to | |
35 | * the user. | |
36 | * | |
37 | * Assumptions made: | |
38 | * * Charset encodings are written the same way as the Accept-Charset | |
39 | * HTTP header specifies them (RFC2616), except that they're parsed | |
40 | * case-insensitive. | |
41 | * * Country codes and language codes are the same in both gettext and | |
42 | * the Accept-Language syntax (except for the case differences, which | |
43 | * are dealt with easily). If not, some input may be ignored. | |
44 | * * The provided gettext-strings are fully qualified; i.e., no "en_US"; | |
45 | * always "en_US.ISO-8859-15" or "en_US.UTF-8", or whichever has been | |
46 | * used. "en.ISO-8859-15" is OK, though. | |
47 | * * The language is more important than the charset; i.e., if the | |
48 | * following is given: | |
49 | * | |
50 | * Accept-Language: nl-be, nl;q=0.8, en-us;q=0.5, en;q=0.3 | |
51 | * Accept-Charset: ISO-8859-15, utf-8;q=0.5 | |
52 | * | |
53 | * And the supplied parameter contains (amongst others) nl_BE.UTF-8 | |
54 | * and nl.ISO-8859-15, then nl_BE.UTF-8 will be picked. | |
55 | * | |
56 | * $Log: accept-to-gettext.inc,v $ | |
57 | * Revision 1.1.1.1 2003/11/19 19:31:15 wouter | |
58 | * * moved to new CVS repo after death of the old | |
59 | * * Fixed code to apply a default to both Accept-Charset and | |
60 | * Accept-Language if none of those headers are supplied; patch from | |
61 | * Dominic Chambers <dominic@encasa.com> | |
62 | * | |
63 | * Revision 1.2 2003/08/14 10:23:59 wouter | |
64 | * Removed little error in Content-Type header syntaxis. | |
65 | * | |
66 | */ | |
67 | ||
68 | /* not really important, this one; perhaps I could've put it inline with | |
69 | * the rest. */ | |
70 | function find_match($curlscore,$curcscore,$curgtlang,$langval,$charval, | |
71 | $gtlang) | |
72 | { | |
73 | if($curlscore < $langval) { | |
74 | $curlscore=$langval; | |
75 | $curcscore=$charval; | |
76 | $curgtlang=$gtlang; | |
77 | } else if ($curlscore == $langval) { | |
78 | if($curcscore < $charval) { | |
79 | $curcscore=$charval; | |
80 | $curgtlang=$gtlang; | |
81 | } | |
82 | } | |
83 | return array($curlscore, $curcscore, $curgtlang); | |
84 | } | |
85 | ||
86 | function al2gt($gettextlangs, $mime) { | |
87 | /* default to "everything is acceptable", as RFC2616 specifies */ | |
88 | $acceptLang=(($_SERVER["HTTP_ACCEPT_LANGUAGE"] == '') ? '*' : | |
89 | $_SERVER["HTTP_ACCEPT_LANGUAGE"]); | |
90 | $acceptChar=(($_SERVER["HTTP_ACCEPT_CHARSET"] == '') ? '*' : | |
91 | $_SERVER["HTTP_ACCEPT_CHARSET"]); | |
92 | $alparts=@preg_split("/,/",$acceptLang); | |
93 | $acparts=@preg_split("/,/",$acceptChar); | |
94 | ||
95 | /* Parse the contents of the Accept-Language header.*/ | |
96 | foreach($alparts as $part) { | |
97 | $part=trim($part); | |
98 | if(preg_match("/;/", $part)) { | |
99 | $lang=@preg_split("/;/",$part); | |
100 | $score=@preg_split("/=/",$lang[1]); | |
101 | $alscores[$lang[0]]=$score[1]; | |
102 | } else { | |
103 | $alscores[$part]=1; | |
104 | } | |
105 | } | |
106 | ||
107 | /* Do the same for the Accept-Charset header. */ | |
108 | ||
109 | /* RFC2616: ``If no "*" is present in an Accept-Charset field, then | |
110 | * all character sets not explicitly mentioned get a quality value of | |
111 | * 0, except for ISO-8859-1, which gets a quality value of 1 if not | |
112 | * explicitly mentioned.'' | |
113 | * | |
114 | * Making it 2 for the time being, so that we | |
115 | * can distinguish between "not specified" and "specified as 1" later | |
116 | * on. */ | |
117 | $acscores["ISO-8859-1"]=2; | |
118 | ||
119 | foreach($acparts as $part) { | |
120 | $part=trim($part); | |
121 | if(preg_match("/;/", $part)) { | |
122 | $cs=@preg_split("/;/",$part); | |
123 | $score=@preg_split("/=/",$cs[1]); | |
124 | $acscores[strtoupper($cs[0])]=$score[1]; | |
125 | } else { | |
126 | $acscores[strtoupper($part)]=1; | |
127 | } | |
128 | } | |
129 | if($acscores["ISO-8859-1"]==2) { | |
130 | $acscores["ISO-8859-1"]=(isset($acscores["*"])?$acscores["*"]:1); | |
131 | } | |
132 | ||
133 | /* | |
134 | * Loop through the available languages/encodings, and pick the one | |
135 | * with the highest score, excluding the ones with a charset the user | |
136 | * did not include. | |
137 | */ | |
138 | $curlscore=0; | |
139 | $curcscore=0; | |
140 | $curgtlang=NULL; | |
141 | foreach($gettextlangs as $gtlang) { | |
142 | ||
143 | $tmp1=preg_replace("/\_/","-",$gtlang); | |
144 | $tmp2=@preg_split("/\./",$tmp1); | |
145 | $allang=strtolower($tmp2[0]); | |
146 | $gtcs=strtoupper($tmp2[1]); | |
147 | $noct=@preg_split("/-/",$allang); | |
148 | ||
149 | $testvals=array( | |
150 | array($alscores[$allang], $acscores[$gtcs]), | |
151 | array($alscores[$noct[0]], $acscores[$gtcs]), | |
152 | array($alscores[$allang], $acscores["*"]), | |
153 | array($alscores[$noct[0]], $acscores["*"]), | |
154 | array($alscores["*"], $acscores[$gtcs]), | |
155 | array($alscores["*"], $acscores["*"])); | |
156 | ||
157 | $found=FALSE; | |
158 | foreach($testvals as $tval) { | |
159 | if(!$found && isset($tval[0]) && isset($tval[1])) { | |
160 | $arr=find_match($curlscore, $curcscore, $curgtlang, $tval[0], | |
161 | $tval[1], $gtlang); | |
162 | $curlscore=$arr[0]; | |
163 | $curcscore=$arr[1]; | |
164 | $curgtlang=$arr[2]; | |
165 | $found=TRUE; | |
166 | } | |
167 | } | |
168 | } | |
169 | ||
170 | /* We must re-parse the gettext-string now, since we may have found it | |
171 | * through a "*" qualifier.*/ | |
172 | ||
173 | $gtparts=@preg_split("/\./",$curgtlang); | |
174 | $tmp=strtolower($gtparts[0]); | |
175 | $lang=preg_replace("/\_/", "-", $tmp); | |
176 | $charset=$gtparts[1]; | |
177 | ||
178 | header("Content-Language: $lang"); | |
179 | header("Content-Type: $mime; charset=$charset"); | |
180 | ||
181 | return $curgtlang; | |
182 | } | |
183 | ||
184 | ?> |