PurifierLinkify.php

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<?php

class HTMLPurifier_Injector_PurifierLinkify extends HTMLPurifier_Injector
{

    public $name = 'PurifierLinkify';
    public $docURL;
    public $needed = array('a' => array('href'));

    public function prepare($config, $context) {
        $this->docURL = $config->get('AutoFormat.PurifierLinkify.DocURL');
        return parent::prepare($config, $context);
    }

    public function handleText(&$token) {
        if (!$this->allowsElement('a')) return;
        if (strpos($token->data, '%') === false) return;

        $bits = preg_split('#%([a-z0-9]+\.[a-z0-9]+)#Si', $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
        $token = array();

        // $i = index
        // $c = count
        // $l = is link
        for ($i = 0, $c = count($bits), $l = false; $i < $c; $i++, $l = !$l) {
            if (!$l) {
                if ($bits[$i] === '') continue;
                $token[] = new HTMLPurifier_Token_Text($bits[$i]);
            } else {
                $token[] = new HTMLPurifier_Token_Start('a',
                    array('href' => str_replace('%s', $bits[$i], $this->docURL)));
                $token[] = new HTMLPurifier_Token_Text('%' . $bits[$i]);
                $token[] = new HTMLPurifier_Token_End('a');
            }
        }

    }

}

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