<?php

namespace WPDT;

class HTMLPurifier_Filter_YouTube extends HTMLPurifier_Filter
{
    /**
     * @type string
     */
    public $name = 'YouTube';
    /**
     * @param string $html
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return string
     */
    public function preFilter($html, $config, $context)
    {
        $pre_regex = '#<object[^>]+>.+?' . '(?:http:)?//www.youtube.com/((?:v|cp)/[A-Za-z0-9\\-_=]+).+?</object>#s';
        $pre_replace = '<span class="youtube-embed">\\1</span>';
        return \preg_replace($pre_regex, $pre_replace, (string) $html);
    }
    /**
     * @param string $html
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return string
     */
    public function postFilter($html, $config, $context)
    {
        $post_regex = '#<span class="youtube-embed">((?:v|cp)/[A-Za-z0-9\\-_=]+)</span>#';
        return \preg_replace_callback($post_regex, array($this, 'postFilterCallback'), (string) $html);
    }
    /**
     * @param $url
     * @return string
     */
    protected function armorUrl($url)
    {
        return \str_replace('--', '-&#45;', $url);
    }
    /**
     * @param array $matches
     * @return string
     */
    protected function postFilterCallback($matches)
    {
        $url = $this->armorUrl($matches[1]);
        return '<object width="425" height="350" type="application/x-shockwave-flash" ' . 'data="//www.youtube.com/' . $url . '">' . '<param name="movie" value="//www.youtube.com/' . $url . '"></param>' . '<!--[if IE]>' . '<embed src="//www.youtube.com/' . $url . '"' . 'type="application/x-shockwave-flash"' . 'wmode="transparent" width="425" height="350" />' . '<![endif]-->' . '</object>';
    }
}
// vim: et sw=4 sts=4
