335 lines
11 KiB
PHP
335 lines
11 KiB
PHP
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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Class representing feed-level data for an RSS2 feed
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*
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* PHP versions 5
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*
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* LICENSE: This source file is subject to version 3.0 of the PHP license
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* that is available through the world-wide-web at the following URI:
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* http://www.php.net/license/3_0.txt. If you did not receive a copy of
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* the PHP License and are unable to obtain it through the web, please
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* send a note to license@php.net so we can mail you a copy immediately.
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*
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* @category XML
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* @package XML_Feed_Parser
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* @author James Stewart <james@jystewart.net>
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* @copyright 2005 James Stewart <james@jystewart.net>
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* @license http://www.gnu.org/copyleft/lesser.html GNU LGPL 2.1
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* @version CVS: $Id: RSS2.php,v 1.12 2008/03/08 18:16:45 jystewart Exp $
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* @link http://pear.php.net/package/XML_Feed_Parser/
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*/
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/**
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* This class handles RSS2 feeds.
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*
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* @author James Stewart <james@jystewart.net>
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* @version Release: 1.0.3
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* @package XML_Feed_Parser
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*/
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class XML_Feed_Parser_RSS2 extends XML_Feed_Parser_Type
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{
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/**
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* The URI of the RelaxNG schema used to (optionally) validate the feed
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* @var string
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*/
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private $relax = 'rss20.rnc';
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/**
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* We're likely to use XPath, so let's keep it global
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* @var DOMXPath
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*/
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protected $xpath;
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/**
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* The feed type we are parsing
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* @var string
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*/
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public $version = 'RSS 2.0';
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/**
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* The class used to represent individual items
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* @var string
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*/
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protected $itemClass = 'XML_Feed_Parser_RSS2Element';
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/**
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* The element containing entries
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* @var string
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*/
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protected $itemElement = 'item';
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/**
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* Here we map those elements we're not going to handle individually
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* to the constructs they are. The optional second parameter in the array
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* tells the parser whether to 'fall back' (not apt. at the feed level) or
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* fail if the element is missing. If the parameter is not set, the function
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* will simply return false and leave it to the client to decide what to do.
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* @var array
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*/
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protected $map = array(
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'ttl' => array('Text'),
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'pubDate' => array('Date'),
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'lastBuildDate' => array('Date'),
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'title' => array('Text'),
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'link' => array('Link'),
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'description' => array('Text'),
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'language' => array('Text'),
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'copyright' => array('Text'),
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'managingEditor' => array('Text'),
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'webMaster' => array('Text'),
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'category' => array('Text'),
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'generator' => array('Text'),
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'docs' => array('Text'),
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'ttl' => array('Text'),
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'image' => array('Image'),
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'skipDays' => array('skipDays'),
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'skipHours' => array('skipHours'));
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/**
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* Here we map some elements to their atom equivalents. This is going to be
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* quite tricky to pull off effectively (and some users' methods may vary)
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* but is worth trying. The key is the atom version, the value is RSS2.
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* @var array
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*/
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protected $compatMap = array(
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'title' => array('title'),
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'rights' => array('copyright'),
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'updated' => array('lastBuildDate'),
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'subtitle' => array('description'),
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'date' => array('pubDate'),
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'author' => array('managingEditor'));
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protected $namespaces = array(
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'dc' => 'http://purl.org/rss/1.0/modules/dc/',
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'content' => 'http://purl.org/rss/1.0/modules/content/');
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/**
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* Our constructor does nothing more than its parent.
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*
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* @param DOMDocument $xml A DOM object representing the feed
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* @param bool (optional) $string Whether or not to validate this feed
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*/
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function __construct(DOMDocument $model, $strict = false)
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{
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$this->model = $model;
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if ($strict) {
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if (! $this->model->relaxNGValidate($this->relax)) {
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throw new XML_Feed_Parser_Exception('Failed required validation');
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}
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}
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$this->xpath = new DOMXPath($this->model);
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foreach ($this->namespaces as $key => $value) {
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$this->xpath->registerNamespace($key, $value);
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}
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$this->numberEntries = $this->count('item');
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}
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/**
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* Retrieves an entry by ID, if the ID is specified with the guid element
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*
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* This is not really something that will work with RSS2 as it does not have
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* clear restrictions on the global uniqueness of IDs. But we can emulate
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* it by allowing access based on the 'guid' element. If DOMXPath::evaluate
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* is available, we also use that to store a reference to the entry in the array
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* used by getEntryByOffset so that method does not have to seek out the entry
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* if it's requested that way.
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*
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* @param string $id any valid ID.
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* @return XML_Feed_Parser_RSS2Element
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*/
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function getEntryById($id)
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{
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if (isset($this->idMappings[$id])) {
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return $this->entries[$this->idMappings[$id]];
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}
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$entries = $this->xpath->query("//item[guid='$id']");
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if ($entries->length > 0) {
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$entry = new $this->itemElement($entries->item(0), $this);
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if (in_array('evaluate', get_class_methods($this->xpath))) {
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$offset = $this->xpath->evaluate("count(preceding-sibling::item)", $entries->item(0));
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$this->entries[$offset] = $entry;
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}
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$this->idMappings[$id] = $entry;
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return $entry;
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}
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}
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/**
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* Get a category from the element
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*
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* The category element is a simple text construct which can occur any number
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* of times. We allow access by offset or access to an array of results.
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*
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* @param string $call for compatibility with our overloading
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* @param array $arguments - arg 0 is the offset, arg 1 is whether to return as array
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* @return string|array|false
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*/
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function getCategory($call, $arguments = array())
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{
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$categories = $this->model->getElementsByTagName('category');
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$offset = empty($arguments[0]) ? 0 : $arguments[0];
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$array = empty($arguments[1]) ? false : true;
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if ($categories->length <= $offset) {
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return false;
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}
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if ($array) {
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$list = array();
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foreach ($categories as $category) {
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array_push($list, $category->nodeValue);
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}
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return $list;
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}
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return $categories->item($offset)->nodeValue;
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}
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/**
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* Get details of the image associated with the feed.
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*
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* @return array|false an array simply containing the child elements
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*/
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protected function getImage()
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{
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$images = $this->xpath->query("//image");
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if ($images->length > 0) {
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$image = $images->item(0);
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$desc = $image->getElementsByTagName('description');
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$description = $desc->length ? $desc->item(0)->nodeValue : false;
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$heigh = $image->getElementsByTagName('height');
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$height = $heigh->length ? $heigh->item(0)->nodeValue : false;
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$widt = $image->getElementsByTagName('width');
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$width = $widt->length ? $widt->item(0)->nodeValue : false;
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return array(
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'title' => $image->getElementsByTagName('title')->item(0)->nodeValue,
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'link' => $image->getElementsByTagName('link')->item(0)->nodeValue,
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'url' => $image->getElementsByTagName('url')->item(0)->nodeValue,
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'description' => $description,
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'height' => $height,
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'width' => $width);
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}
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return false;
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}
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/**
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* The textinput element is little used, but in the interests of
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* completeness...
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*
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* @return array|false
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*/
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function getTextInput()
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{
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$inputs = $this->model->getElementsByTagName('input');
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if ($inputs->length > 0) {
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$input = $inputs->item(0);
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return array(
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'title' => $input->getElementsByTagName('title')->item(0)->value,
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'description' =>
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$input->getElementsByTagName('description')->item(0)->value,
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'name' => $input->getElementsByTagName('name')->item(0)->value,
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'link' => $input->getElementsByTagName('link')->item(0)->value);
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}
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return false;
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}
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/**
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* Utility function for getSkipDays and getSkipHours
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*
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* This is a general function used by both getSkipDays and getSkipHours. It simply
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* returns an array of the values of the children of the appropriate tag.
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*
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* @param string $tagName The tag name (getSkipDays or getSkipHours)
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* @return array|false
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*/
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protected function getSkips($tagName)
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{
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$hours = $this->model->getElementsByTagName($tagName);
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if ($hours->length == 0) {
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return false;
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}
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$skipHours = array();
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foreach($hours->item(0)->childNodes as $hour) {
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if ($hour instanceof DOMElement) {
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array_push($skipHours, $hour->nodeValue);
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}
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}
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return $skipHours;
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}
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/**
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* Retrieve skipHours data
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*
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* The skiphours element provides a list of hours on which this feed should
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* not be checked. We return an array of those hours (integers, 24 hour clock)
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*
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* @return array
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*/
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function getSkipHours()
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{
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return $this->getSkips('skipHours');
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}
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/**
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* Retrieve skipDays data
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*
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* The skipdays element provides a list of days on which this feed should
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* not be checked. We return an array of those days.
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*
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* @return array
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*/
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function getSkipDays()
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{
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return $this->getSkips('skipDays');
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}
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/**
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* Return content of the little-used 'cloud' element
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*
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* The cloud element is rarely used. It is designed to provide some details
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* of a location to update the feed.
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*
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* @return array an array of the attributes of the element
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*/
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function getCloud()
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{
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$cloud = $this->model->getElementsByTagName('cloud');
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if ($cloud->length == 0) {
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return false;
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}
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$cloudData = array();
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foreach ($cloud->item(0)->attributes as $attribute) {
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$cloudData[$attribute->name] = $attribute->value;
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}
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return $cloudData;
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}
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/**
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* Get link URL
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*
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* In RSS2 a link is a text element but in order to ensure that we resolve
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* URLs properly we have a special function for them. We maintain the
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* parameter used by the atom getLink method, though we only use the offset
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* parameter.
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*
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* @param int $offset The position of the link within the feed. Starts from 0
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* @param string $attribute The attribute of the link element required
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* @param array $params An array of other parameters. Not used.
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* @return string
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*/
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function getLink($offset, $attribute = 'href', $params = array())
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{
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$xPath = new DOMXPath($this->model);
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$links = $xPath->query('//link');
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if ($links->length <= $offset) {
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return false;
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}
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$link = $links->item($offset);
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return $this->addBase($link->nodeValue, $link);
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}
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}
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?>
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