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Filename : Links.php
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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP Version 5                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Author: Stijn de Reede <sjr@gmx.co.uk>                               |
// +----------------------------------------------------------------------+
//
// $Id$
//

/**
* @package  HTML_BBCodeParser2
* @author   Stijn de Reede  <sjr@gmx.co.uk>
*/
require_once 'HTML/BBCodeParser2/Filter.php';

/**
 *
 */
class HTML_BBCodeParser2_Filter_Links extends HTML_BBCodeParser2_Filter
{
    /**
     * List of allowed schemes
     *
     * @access  private
     * @var     array
     */
    var $_allowedSchemes = array('http', 'https', 'ftp', 'irc');

    /**
     * Default scheme
     *
     * @access  private
     * @var     string
     */
    var $_defaultScheme = 'http';

    /**
     * An array of tags parsed by the engine
     *
     * @access   private
     * @var      array
     */
    var $_definedTags = array(
        'url' => array(
            'htmlopen'  => 'a',
            'htmlclose' => 'a',
            'allowed'   => 'none^img',
            'attributes'=> array('url' => 'href=%2$s%1$s%2$s',
                                 't'   => 'target=%2$s%1$s%2$s')
        )
    );


    /**
     * Executes statements before the actual array building starts
     *
     * This method should be overwritten in a filter if you want to do
     * something before the parsing process starts. This can be useful to
     * allow certain short alternative tags which then can be converted into
     * proper tags with preg_replace() calls.
     * The main class walks through all the filters and and calls this
     * method if it exists. The filters should modify their private $_text
     * variable.
     *
     * @return   none
     * @access   private
     * @see      $_text
     * @author   Stijn de Reede <sjr@gmx.co.uk>
     * @author   Seth Price <seth@pricepages.org>
     */
    function _preparse()
    {
        $options = $this->_options;
        $o = $options['open'];
        $c = $options['close'];
        $oe = $options['open_esc'];
        $ce = $options['close_esc'];

        $schemes = implode('|', $this->_allowedSchemes);

        $pattern = array(   "/(?<![\"'=".$ce."\/])(".$oe."[^".$ce."]*".$ce.")?(((".$schemes."):\/\/|www)[@-a-z0-9.]+\.[a-z]{2,4}[^\s()\[\]]*)/i",
                            "!".$oe."url(".$ce."|\s.*".$ce.")(.*)".$oe."/url".$ce."!iU",
                            "!".$oe."url=((([a-z]*:(//)?)|www)[@-a-z0-9.]+)([^\s\[\]]*)".$ce."(.*)".$oe."/url".$ce."!i");

        $pp = preg_replace_callback($pattern[0], array($this, 'smarterPPLinkExpand'), $this->_text);
        $pp = preg_replace($pattern[1], $o."url=\$2\$1\$2".$o."/url".$c, $pp);
        $this->_preparsed = preg_replace_callback($pattern[2], array($this, 'smarterPPLink'), $pp);

    }

    /**
     * Intelligently expand a URL into a link
     *
     * @return  string
     * @access  private
     * @author  Seth Price <seth@pricepages.org>
     * @author  Lorenzo Alberton <l.alberton@quipo.it>
     */
    function smarterPPLinkExpand($matches)
    {
        $options = $this->_options;
        $o = $options['open'];
        $c = $options['close'];
        $oe = $options['open_esc'];
        $ce = $options['close_esc'];

        //If we have an intro tag that is [url], then skip this match
        if (preg_match("/".$oe."url(=[^\s()\[\]=]+)?".$ce."/i", $matches[1])) {
            return $matches[0];
        }

        $punctuation = '.,;:'; // Links can't end with these chars
        $trailing = '';
        // Knock off ending punctuation
        $last = substr($matches[2], -1);
        while (strpos($punctuation, $last) !== false) {
            // Last character is punctuation - remove it from the url
            $trailing = $last.$trailing;
            $matches[2] = substr($matches[2], 0, -1);
            $last = substr($matches[2], -1);
        }

        $off = strpos($matches[2], ':');

        //Is a ":" (therefore a scheme) defined?
        if ($off === false) {
            /*
             * Create a link with the default scheme of http. Notice that the
             * text that is viewable to the user is unchanged, but the link
             * itself contains the "http://".
             */
            return $matches[1].$o.'url='.$this->_defaultScheme.'://'.$matches[2].$c.$matches[2].$o.'/url'.$c.$trailing;
        }

        $scheme = substr($matches[2], 0, $off);

        /*
         * If protocol is in the approved list than allow it. Note that this
         * check isn't really needed, but the created link will just be deleted
         * later in smarterPPLink() if we create it now and it isn't on the
         * scheme list.
         */
        if (in_array($scheme, $this->_allowedSchemes)) {
            return $matches[1].$o.'url'.$c.$matches[2].$o.'/url'.$c.$trailing;
        }
        
        return $matches[0];
    }

    /**
     * Finish preparsing URL to clean it up
     *
     * @return  string
     * @access  private
     * @author  Seth Price <seth@pricepages.org>
     */
    function smarterPPLink($matches)
    {
        $options = $this->_options;
        $o = $options['open'];
        $c = $options['close'];

        $urlServ = $matches[1];
        $path = $matches[5];

        $off = strpos($urlServ, ':');

        if ($off === false) {
            //Default to http
            $urlServ = $this->_defaultScheme.'://'.$urlServ;
            $off = strpos($urlServ, ':');
        }

        //Add trailing slash if missing (to create a valid URL)
        if (!$path) {
            $path = '/';
        }

        $protocol = substr($urlServ, 0, $off);

        if (in_array($protocol, $this->_allowedSchemes)) {
            //If protocol is in the approved list than allow it
            return $o.'url='.$urlServ.$path.$c.$matches[6].$o.'/url'.$c;
        }
        
        //Else remove url tag
        return $matches[6];
    }
}
?>