Automated build for v0.01
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186
lib/accept-to-gettext.php
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186
lib/accept-to-gettext.php
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<?php
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/*
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* accept-to-gettext.inc -- convert information in 'Accept-*' headers to
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* gettext language identifiers.
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* Copyright (c) 2003, Wouter Verhelst <wouter@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Usage:
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*
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* $locale=al2gt(<array of supported languages/charsets in gettext syntax>,
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* <MIME type of document>);
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* setlocale('LC_ALL', $locale); // or 'LC_MESSAGES', or whatever...
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*
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* Example:
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*
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* $langs=array('nl_BE.ISO-8859-15','nl_BE.UTF-8','en_US.UTF-8','en_GB.UTF-8');
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* $locale=al2gt($langs, 'text/html');
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* setlocale('LC_ALL', $locale);
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*
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* Note that this will send out header information (to be
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* RFC2616-compliant), so it must be called before anything is sent to
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* the user.
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*
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* Assumptions made:
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* * Charset encodings are written the same way as the Accept-Charset
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* HTTP header specifies them (RFC2616), except that they're parsed
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* case-insensitive.
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* * Country codes and language codes are the same in both gettext and
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* the Accept-Language syntax (except for the case differences, which
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* are dealt with easily). If not, some input may be ignored.
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* * The provided gettext-strings are fully qualified; i.e., no "en_US";
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* always "en_US.ISO-8859-15" or "en_US.UTF-8", or whichever has been
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* used. "en.ISO-8859-15" is OK, though.
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* * The language is more important than the charset; i.e., if the
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* following is given:
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*
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* Accept-Language: nl-be, nl;q=0.8, en-us;q=0.5, en;q=0.3
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* Accept-Charset: ISO-8859-15, utf-8;q=0.5
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*
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* And the supplied parameter contains (amongst others) nl_BE.UTF-8
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* and nl.ISO-8859-15, then nl_BE.UTF-8 will be picked.
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*
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* $Log: accept-to-gettext.inc,v $
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* Revision 1.1.1.1 2003/11/19 19:31:15 wouter
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* * moved to new CVS repo after death of the old
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* * Fixed code to apply a default to both Accept-Charset and
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* Accept-Language if none of those headers are supplied; patch from
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* Dominic Chambers <dominic@encasa.com>
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*
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* Revision 1.2 2003/08/14 10:23:59 wouter
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* Removed little error in Content-Type header syntaxis.
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*
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* 2007-04-01
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* add '@' before use of arrays, to avoid PHP warnings.
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*/
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/* not really important, this one; perhaps I could've put it inline with
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* the rest. */
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function find_match($curlscore,$curcscore,$curgtlang,$langval,$charval,
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$gtlang)
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{
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if($curlscore < $langval) {
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$curlscore=$langval;
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$curcscore=$charval;
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$curgtlang=$gtlang;
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} else if ($curlscore == $langval) {
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if($curcscore < $charval) {
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$curcscore=$charval;
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$curgtlang=$gtlang;
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}
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}
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return array($curlscore, $curcscore, $curgtlang);
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}
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function al2gt($gettextlangs, $mime) {
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/* default to "everything is acceptable", as RFC2616 specifies */
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$acceptLang=(($_SERVER["HTTP_ACCEPT_LANGUAGE"] == '') ? '*' :
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$_SERVER["HTTP_ACCEPT_LANGUAGE"]);
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$acceptChar=(($_SERVER["HTTP_ACCEPT_CHARSET"] == '') ? '*' :
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$_SERVER["HTTP_ACCEPT_CHARSET"]);
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$alparts=@preg_split("/,/",$acceptLang);
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$acparts=@preg_split("/,/",$acceptChar);
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/* Parse the contents of the Accept-Language header.*/
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foreach($alparts as $part) {
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$part=trim($part);
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if(preg_match("/;/", $part)) {
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$lang=@preg_split("/;/",$part);
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$score=@preg_split("/=/",$lang[1]);
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$alscores[$lang[0]]=$score[1];
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} else {
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$alscores[$part]=1;
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}
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}
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/* Do the same for the Accept-Charset header. */
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/* RFC2616: ``If no "*" is present in an Accept-Charset field, then
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* all character sets not explicitly mentioned get a quality value of
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* 0, except for ISO-8859-1, which gets a quality value of 1 if not
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* explicitly mentioned.''
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*
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* Making it 2 for the time being, so that we
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* can distinguish between "not specified" and "specified as 1" later
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* on. */
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$acscores["ISO-8859-1"]=2;
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foreach($acparts as $part) {
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$part=trim($part);
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if(preg_match("/;/", $part)) {
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$cs=@preg_split("/;/",$part);
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$score=@preg_split("/=/",$cs[1]);
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$acscores[strtoupper($cs[0])]=$score[1];
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} else {
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$acscores[strtoupper($part)]=1;
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}
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}
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if($acscores["ISO-8859-1"]==2) {
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$acscores["ISO-8859-1"]=(isset($acscores["*"])?$acscores["*"]:1);
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}
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/*
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* Loop through the available languages/encodings, and pick the one
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* with the highest score, excluding the ones with a charset the user
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* did not include.
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*/
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$curlscore=0;
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$curcscore=0;
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$curgtlang=NULL;
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foreach($gettextlangs as $gtlang) {
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$tmp1=preg_replace("/\_/","-",$gtlang);
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$tmp2=@preg_split("/\./",$tmp1);
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$allang=strtolower($tmp2[0]);
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$gtcs=strtoupper($tmp2[1]);
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$noct=@preg_split("/-/",$allang);
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$testvals=array(
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array(@$alscores[$allang], @$acscores[$gtcs]),
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array(@$alscores[$noct[0]], @$acscores[$gtcs]),
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array(@$alscores[$allang], @$acscores["*"]),
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array(@$alscores[$noct[0]], @$acscores["*"]),
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array(@$alscores["*"], @$acscores[$gtcs]),
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array(@$alscores["*"], @$acscores["*"]));
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$found=FALSE;
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foreach($testvals as $tval) {
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if(!$found && isset($tval[0]) && isset($tval[1])) {
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$arr=find_match($curlscore, $curcscore, $curgtlang, $tval[0],
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$tval[1], $gtlang);
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$curlscore=$arr[0];
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$curcscore=$arr[1];
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$curgtlang=$arr[2];
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$found=TRUE;
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}
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}
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}
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/* We must re-parse the gettext-string now, since we may have found it
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* through a "*" qualifier.*/
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$gtparts=@preg_split("/\./",$curgtlang);
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$tmp=strtolower($gtparts[0]);
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$lang=preg_replace("/\_/", "-", $tmp);
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$charset=$gtparts[1];
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header("Content-Language: $lang");
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header("Content-Type: $mime; charset=$charset");
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return $curgtlang;
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}
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?>
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