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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**

 * Class representing entries in an RSS2 feed.

 *

 * PHP versions 5

 *

 * LICENSE: This source file is subject to version 3.0 of the PHP license

 * that is available through the world-wide-web at the following URI:

 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of

 * the PHP License and are unable to obtain it through the web, please

 * send a note to license@php.net so we can mail you a copy immediately.

 *

 * @category   XML

 * @package    XML_Feed_Parser

 * @author     James Stewart <james@jystewart.net>

 * @copyright  2005 James Stewart <james@jystewart.net>

 * @license    http://www.gnu.org/copyleft/lesser.html  GNU LGPL 2.1

 * @version    CVS: $Id: RSS2Element.php,v 1.2 2007-07-25 15:05:34 jp_milcent Exp $

 * @link       http://pear.php.net/package/XML_Feed_Parser/

 */

/**

 * This class provides support for RSS 2.0 entries. It will usually be

 * called by XML_Feed_Parser_RSS2 with which it shares many methods.

 *

 * @author    James Stewart <james@jystewart.net>

 * @version    Release: 1.0.2

 * @package XML_Feed_Parser

 */

class XML_Feed_Parser_RSS2Element extends XML_Feed_Parser_RSS2

{

    /**

     * This will be a reference to the parent object for when we want

     * to use a 'fallback' rule

     * @var XML_Feed_Parser_RSS2

     */

    protected $parent;

    /**

     * Our specific element map

     * @var array

     */

    protected $map = array(

        'title' => array('Text'),

        'guid' => array('Guid'),

        'description' => array('Text'),

        'author' => array('Text'),

        'comments' => array('Text'),

        'enclosure' => array('Enclosure'),

        'pubDate' => array('Date'),

        'source' => array('Source'),

        'link' => array('Text'),

        'content' => array('Content'));

    /**

     * Here we map some elements to their atom equivalents. This is going to be

     * quite tricky to pull off effectively (and some users' methods may vary)

     * but is worth trying. The key is the atom version, the value is RSS2.

     * @var array

     */

    protected $compatMap = array(

        'id' => array('guid'),

        'updated' => array('lastBuildDate'),

        'published' => array('pubdate'),

        'guidislink' => array('guid', 'ispermalink'),

        'summary' => array('description'));

    /**

     * Store useful information for later.

     *

     * @param   DOMElement  $element - this item as a DOM element

     * @param   XML_Feed_Parser_RSS2    $parent - the feed of which this is a member

     */

    function __construct(DOMElement $element, $parent, $xmlBase = '')

    {

        $this->model = $element;

        $this->parent = $parent;

    }

    /**

     * Get the value of the guid element, if specified

     *

     * guid is the closest RSS2 has to atom's ID. It is usually but not always a

     * URI. The one attribute that RSS2 can posess is 'ispermalink' which specifies

     * whether the guid is itself dereferencable. Use of guid is not obligatory,

     * but is advisable. To get the guid you would call $item->id() (for atom

     * compatibility) or $item->guid(). To check if this guid is a permalink call

     * $item->guid("ispermalink").

     *

     * @param   string  $method - the method name being called

     * @param   array   $params - parameters required

     * @return  string  the guid or value of ispermalink

     */

    protected function getGuid($method, $params)

    {

        $attribute = (isset($params[0]) and $params[0] == 'ispermalink') ?

            true : false;

        $tag = $this->model->getElementsByTagName('guid');

        if ($tag->length > 0) {

            if ($attribute) {

                if ($tag->hasAttribute("ispermalink")) {

                    return $tag->getAttribute("ispermalink");

                }

            }

            return $tag->item(0)->nodeValue;

        }

        return false;

    }

    /**

     * Access details of file enclosures

     *

     * The RSS2 spec is ambiguous as to whether an enclosure element must be

     * unique in a given entry. For now we will assume it needn't, and allow

     * for an offset.

     *

     * @param   string $method - the method being called

     * @param   array   $parameters - we expect the first of these to be our offset

     * @return  array|false

     */

    protected function getEnclosure($method, $parameters)

    {

        $encs = $this->model->getElementsByTagName('enclosure');

        $offset = isset($parameters[0]) ? $parameters[0] : 0;

        if ($encs->length > $offset) {

            try {

                if (! $encs->item($offset)->hasAttribute('url')) {

                    return false;

                }

                $attrs = $encs->item($offset)->attributes;

                return array(

                    'url' => $attrs->getNamedItem('url')->value,

                    'length' => $attrs->getNamedItem('length')->value,

                    'type' => $attrs->getNamedItem('type')->value);

            } catch (Exception $e) {

                return false;

            }

        }

        return false;

    }

    /**

     * Get the entry source if specified

     *

     * source is an optional sub-element of item. Like atom:source it tells

     * us about where the entry came from (eg. if it's been copied from another

     * feed). It is not a rich source of metadata in the same way as atom:source

     * and while it would be good to maintain compatibility by returning an

     * XML_Feed_Parser_RSS2 element, it makes a lot more sense to return an array.

     *

     * @return array|false

     */

    protected function getSource()

    {

        $get = $this->model->getElementsByTagName('source');

        if ($get->length) {

            $source = $get->item(0);

            $array = array(

                'content' => $source->nodeValue);

            foreach ($source->attributes as $attribute) {

                $array[$attribute->name] = $attribute->value;

            }

            return $array;

        }

        return false;

    }

}

?>