<?php
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								namespace p3k\XRay\Formats;
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								/**
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								 * Allows Microformats2 classes but rejects any others
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								 */
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								class HTMLPurifier_AttrDef_HTML_Microformats2 extends \HTMLPurifier_AttrDef_HTML_Nmtokens
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								{
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								    /**
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								     * @param string $string
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								     * @param HTMLPurifier_Config $config
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								     * @param HTMLPurifier_Context $context
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								     * @return bool|string
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								     */
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								    protected function split($string, $config, $context)
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								    {
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								        // really, this twiddle should be lazy loaded
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								        $name = $config->getDefinition('HTML')->doctype->name;
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								        if ($name == "XHTML 1.1" || $name == "XHTML 2.0") {
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								            return parent::split($string, $config, $context);
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								        } else {
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								            return preg_split('/\s+/', $string);
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								        }
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								    }
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								    /**
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								     * @param array $tokens
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								     * @param HTMLPurifier_Config $config
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								     * @param HTMLPurifier_Context $context
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								     * @return array
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								     */
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								    protected function filter($tokens, $config, $context)
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								    {
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								        $ret = array();
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								        foreach ($tokens as $token) {
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								            if(preg_match('/^([hpue]|dt)-[a-z\-]+$/', $token)) {
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								                $ret[] = $token;
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								            }
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								        }
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								        return $ret;
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								    }
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								}
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