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+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Atom feed class for XML_Feed_Parser
+ *
+ * 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: Atom.php,v 1.29 2008/03/30 22:00:36 jystewart Exp $
+ * @link http://pear.php.net/package/XML_Feed_Parser/
+*/
+
+/**
+ * This is the class that determines how we manage Atom 1.0 feeds
+ *
+ * How we deal with constructs:
+ * date - return as unix datetime for use with the 'date' function unless specified otherwise
+ * text - return as is. optional parameter will give access to attributes
+ * person - defaults to name, but parameter based access
+ *
+ * @author James Stewart <james@jystewart.net>
+ * @version Release: 1.0.3
+ * @package XML_Feed_Parser
+ */
+class XML_Feed_Parser_Atom extends XML_Feed_Parser_Type
+{
+ /**
+ * The URI of the RelaxNG schema used to (optionally) validate the feed
+ * @var string
+ */
+ private $relax = 'atom.rnc';
+
+ /**
+ * We're likely to use XPath, so let's keep it global
+ * @var DOMXPath
+ */
+ public $xpath;
+
+ /**
+ * When performing XPath queries we will use this prefix
+ * @var string
+ */
+ private $xpathPrefix = '//';
+
+ /**
+ * The feed type we are parsing
+ * @var string
+ */
+ public $version = 'Atom 1.0';
+
+ /**
+ * The class used to represent individual items
+ * @var string
+ */
+ protected $itemClass = 'XML_Feed_Parser_AtomElement';
+
+ /**
+ * The element containing entries
+ * @var string
+ */
+ protected $itemElement = 'entry';
+
+ /**
+ * Here we map those elements we're not going to handle individually
+ * to the constructs they are. The optional second parameter in the array
+ * tells the parser whether to 'fall back' (not apt. at the feed level) or
+ * fail if the element is missing. If the parameter is not set, the function
+ * will simply return false and leave it to the client to decide what to do.
+ * @var array
+ */
+ protected $map = array(
+ 'author' => array('Person'),
+ 'contributor' => array('Person'),
+ 'icon' => array('Text'),
+ 'logo' => array('Text'),
+ 'id' => array('Text', 'fail'),
+ 'rights' => array('Text'),
+ 'subtitle' => array('Text'),
+ 'title' => array('Text', 'fail'),
+ 'updated' => array('Date', 'fail'),
+ 'link' => array('Link'),
+ 'generator' => array('Text'),
+ 'category' => array('Category'));
+
+ /**
+ * Here we provide a few mappings for those very special circumstances in
+ * which it makes sense to map back to the RSS2 spec. Key is RSS2 version
+ * value is an array consisting of the equivalent in atom and any attributes
+ * needed to make the mapping.
+ * @var array
+ */
+ protected $compatMap = array(
+ 'guid' => array('id'),
+ 'links' => array('link'),
+ 'tags' => array('category'),
+ 'contributors' => array('contributor'));
+
+ /**
+ * Our constructor does nothing more than its parent.
+ *
+ * @param DOMDocument $xml A DOM object representing the feed
+ * @param bool (optional) $string Whether or not to validate this feed
+ */
+ function __construct(DOMDocument $model, $strict = false)
+ {
+ $this->model = $model;
+
+ if ($strict) {
+ if (! $this->model->relaxNGValidateSource($this->relax)) {
+ throw new XML_Feed_Parser_Exception('Failed required validation');
+ }
+ }
+
+ $this->xpath = new DOMXPath($this->model);
+ $this->xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
+ $this->numberEntries = $this->count('entry');
+ }
+
+ /**
+ * Implement retrieval of an entry based on its ID for atom feeds.
+ *
+ * This function uses XPath to get the entry based on its ID. If DOMXPath::evaluate
+ * is available, we also use that to store a reference to the entry in the array
+ * used by getEntryByOffset so that method does not have to seek out the entry
+ * if it's requested that way.
+ *
+ * @param string $id any valid Atom ID.
+ * @return XML_Feed_Parser_AtomElement
+ */
+ function getEntryById($id)
+ {
+ if (isset($this->idMappings[$id])) {
+ return $this->entries[$this->idMappings[$id]];
+ }
+
+ $entries = $this->xpath->query("//atom:entry[atom:id='$id']");
+
+ if ($entries->length > 0) {
+ $xmlBase = $entries->item(0)->baseURI;
+ $entry = new $this->itemClass($entries->item(0), $this, $xmlBase);
+
+ if (in_array('evaluate', get_class_methods($this->xpath))) {
+ $offset = $this->xpath->evaluate("count(preceding-sibling::atom:entry)", $entries->item(0));
+ $this->entries[$offset] = $entry;
+ }
+
+ $this->idMappings[$id] = $entry;
+
+ return $entry;
+ }
+
+ }
+
+ /**
+ * Retrieves data from a person construct.
+ *
+ * Get a person construct. We default to the 'name' element but allow
+ * access to any of the elements.
+ *
+ * @param string $method The name of the person construct we want
+ * @param array $arguments An array which we hope gives a 'param'
+ * @return string|false
+ */
+ protected function getPerson($method, $arguments)
+ {
+ $offset = empty($arguments[0]) ? 0 : $arguments[0];
+ $parameter = empty($arguments[1]['param']) ? 'name' : $arguments[1]['param'];
+ $section = $this->model->getElementsByTagName($method);
+
+ if ($parameter == 'url') {
+ $parameter = 'uri';
+ }
+
+ if ($section->length <= $offset) {
+ return false;
+ }
+
+ $param = $section->item($offset)->getElementsByTagName($parameter);
+ if ($param->length == 0) {
+ return false;
+ }
+ return $param->item(0)->nodeValue;
+ }
+
+ /**
+ * Retrieves an element's content where that content is a text construct.
+ *
+ * Get a text construct. When calling this method, the two arguments
+ * allowed are 'offset' and 'attribute', so $parser->subtitle() would
+ * return the content of the element, while $parser->subtitle(false, 'type')
+ * would return the value of the type attribute.
+ *
+ * @todo Clarify overlap with getContent()
+ * @param string $method The name of the text construct we want
+ * @param array $arguments An array which we hope gives a 'param'
+ * @return string
+ */
+ protected function getText($method, $arguments)
+ {
+ $offset = empty($arguments[0]) ? 0: $arguments[0];
+ $attribute = empty($arguments[1]) ? false : $arguments[1];
+ $tags = $this->model->getElementsByTagName($method);
+
+ if ($tags->length <= $offset) {
+ return false;
+ }
+
+ $content = $tags->item($offset);
+
+ if (! $content->hasAttribute('type')) {
+ $content->setAttribute('type', 'text');
+ }
+ $type = $content->getAttribute('type');
+
+ if (! empty($attribute) and
+ ! ($method == 'generator' and $attribute == 'name')) {
+ if ($content->hasAttribute($attribute)) {
+ return $content->getAttribute($attribute);
+ } else if ($attribute == 'href' and $content->hasAttribute('uri')) {
+ return $content->getAttribute('uri');
+ }
+ return false;
+ }
+
+ return $this->parseTextConstruct($content);
+ }
+
+ /**
+ * Extract content appropriately from atom text constructs
+ *
+ * Because of different rules applied to the content element and other text
+ * constructs, they are deployed as separate functions, but they share quite
+ * a bit of processing. This method performs the core common process, which is
+ * to apply the rules for different mime types in order to extract the content.
+ *
+ * @param DOMNode $content the text construct node to be parsed
+ * @return String
+ * @author James Stewart
+ **/
+ protected function parseTextConstruct(DOMNode $content)
+ {
+ if ($content->hasAttribute('type')) {
+ $type = $content->getAttribute('type');
+ } else {
+ $type = 'text';
+ }
+
+ if (strpos($type, 'text/') === 0) {
+ $type = 'text';
+ }
+
+ switch ($type) {
+ case 'text':
+ case 'html':
+ return $content->textContent;
+ break;
+ case 'xhtml':
+ $container = $content->getElementsByTagName('div');
+ if ($container->length == 0) {
+ return false;
+ }
+ $contents = $container->item(0);
+ if ($contents->hasChildNodes()) {
+ /* Iterate through, applying xml:base and store the result */
+ $result = '';
+ foreach ($contents->childNodes as $node) {
+ $result .= $this->traverseNode($node);
+ }
+ return $result;
+ }
+ break;
+ case preg_match('@^[a-zA-Z]+/[a-zA-Z+]*xml@i', $type) > 0:
+ return $content;
+ break;
+ case 'application/octet-stream':
+ default:
+ return base64_decode(trim($content->nodeValue));
+ break;
+ }
+ return false;
+ }
+ /**
+ * Get a category from the entry.
+ *
+ * A feed or entry can have any number of categories. A category can have the
+ * attributes term, scheme and label.
+ *
+ * @param string $method The name of the text construct we want
+ * @param array $arguments An array which we hope gives a 'param'
+ * @return string
+ */
+ function getCategory($method, $arguments)
+ {
+ $offset = empty($arguments[0]) ? 0: $arguments[0];
+ $attribute = empty($arguments[1]) ? 'term' : $arguments[1];
+ $categories = $this->model->getElementsByTagName('category');
+ if ($categories->length <= $offset) {
+ $category = $categories->item($offset);
+ if ($category->hasAttribute($attribute)) {
+ return $category->getAttribute($attribute);
+ }
+ }
+ return false;
+ }
+
+ /**
+ * This element must be present at least once with rel="feed". This element may be
+ * present any number of further times so long as there is no clash. If no 'rel' is
+ * present and we're asked for one, we follow the example of the Universal Feed
+ * Parser and presume 'alternate'.
+ *
+ * @param int $offset the position of the link within the container
+ * @param string $attribute the attribute name required
+ * @param array an array of attributes to search by
+ * @return string the value of the attribute
+ */
+ function getLink($offset = 0, $attribute = 'href', $params = false)
+ {
+ if (is_array($params) and !empty($params)) {
+ $terms = array();
+ $alt_predicate = '';
+ $other_predicate = '';
+
+ foreach ($params as $key => $value) {
+ if ($key == 'rel' && $value == 'alternate') {
+ $alt_predicate = '[not(@rel) or @rel="alternate"]';
+ } else {
+ $terms[] = "@$key='$value'";
+ }
+ }
+ if (!empty($terms)) {
+ $other_predicate = '[' . join(' and ', $terms) . ']';
+ }
+ $query = $this->xpathPrefix . 'atom:link' . $alt_predicate . $other_predicate;
+ $links = $this->xpath->query($query);
+ } else {
+ $links = $this->model->getElementsByTagName('link');
+ }
+ if ($links->length > $offset) {
+ if ($links->item($offset)->hasAttribute($attribute)) {
+ $value = $links->item($offset)->getAttribute($attribute);
+ if ($attribute == 'href') {
+ $value = $this->addBase($value, $links->item($offset));
+ }
+ return $value;
+ } else if ($attribute == 'rel') {
+ return 'alternate';
+ }
+ }
+ return false;
+ }
+}
+
+?> \ No newline at end of file
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