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1 efrain 1 
<?php
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/**
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 * Post-transform that copies lang's value to xml:lang (and vice-versa)
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 * @note Theoretically speaking, this could be a pre-transform, but putting
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 *       post is more efficient.
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 */
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class HTMLPurifier_AttrTransform_Lang extends HTMLPurifier_AttrTransform
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{
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    /**
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     * @param array $attr
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     * @param HTMLPurifier_Config $config
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     * @param HTMLPurifier_Context $context
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     * @return array
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     */
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    public function transform($attr, $config, $context)
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    {
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        $lang = isset($attr['lang']) ? $attr['lang'] : false;
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        $xml_lang = isset($attr['xml:lang']) ? $attr['xml:lang'] : false;
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        if ($lang !== false && $xml_lang === false) {
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            $attr['xml:lang'] = $lang;
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        } elseif ($xml_lang !== false) {
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            $attr['lang'] = $xml_lang;
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        }
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        return $attr;
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    }
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}
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// vim: et sw=4 sts=4