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htmlpurifier/library/HTMLPurifier/AttrTransform/Lang.php

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<?php
require_once 'HTMLPurifier/AttrTransform.php';
class HTMLPurifier_AttrTransform_Lang extends HTMLPurifier_AttrTransform
{
function transform($token) {
$lang = isset($token->attributes['lang']) ?
$token->attributes['lang'] : false;
$xml_lang = isset($token->attributes['xml:lang']) ?
$token->attributes['xml:lang'] : false;
if ($lang === false && $xml_lang == false) return $token;
$new_token = $token->copy();
if ($lang !== false && $xml_lang === false) {
$new_token->attributes['xml:lang'] = $lang;
} elseif ($xml_lang !== false) {
$new_token->attributes['lang'] = $xml_lang;
}
return $new_token;
}
}
?>