Updated Simple_HTML_Dom and fixed module XML to work with KH 3.3

modules/xml/classes/XML/Core.php

@@ -0,0 +1,732 @@
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ *	Document   : core.php
+ *	Created on : 1 mai 2009, 13:03:03
+ *	@author Cedric de Saint Leger <c.desaintleger@gmail.com>
+ *
+ *	Description:
+ *      XML_Core class.
+ */
+
+ class XML_Core
+ {
+	/**
+	 * @var string XML document version
+	 */
+	public static $xml_version = "1.0";
+
+	/**
+	 * @var string Root Node name
+	 */
+	public $root_node;
+
+	/**
+	 * The DOM_Element corresponding to this XML instance
+	 * This is made public to use DOM functions directly if desired.
+	 * @var DOM_Element XML instance DOM node.
+	 */
+	public $dom_node;
+
+	/**
+	 * Basically a handy shortcut of $this->dom_node->ownerDocument
+	 * All XML instance belonging to the same document will have this attribute in common
+	 * @var DOM_Document XML instance DOM document, owner of dom_node
+	 */
+	public $dom_doc;
+
+	/**
+	 * @var array Array of XML_Meta, containing metadata about XML drivers config
+	 */
+	protected static $_metas = array();
+
+
+	/**
+	 * This creates an XML object from the specified driver.
+	 * Specify the driver name, or if there is no specific driver, the root node name
+	 * @param string $driver [optional] Driver Name
+	 * @param string $root_node [optional] Root Node name. Force the root node name. Must be used if no driver nor element is specified.
+	 * @param string $element [optional] XML string or file to generate XML from. Must be used if no driver nor root_node is specified.
+	 * @return XML XML object
+	 */
+	public static function factory($driver = NULL, $root_node = NULL, $element = NULL)
+	{
+		if ($driver)
+		{
+			// Let's attempt to generate a new instance of the subclass corresponding to the driver provided
+			$class = 'XML_Driver_'.ucfirst($driver);
+
+			// Register a new meta object
+			XML::$_metas[strtolower($class)] = $meta = new XML_Meta;
+
+			// Override the meta with driver-specific attributes
+			call_user_func(array($class, "initialize"), $meta);
+
+			//  Set content type to default if it is not already set, and report it as initialized
+			$meta->content_type("text/xml")->set_initialized();
+
+			return new $class($element, $root_node);
+		}
+		else
+		{
+			// Register a new meta object in the root node
+			XML::$_metas["xml"] = $meta = new XML_Meta;
+
+			// Set content type to default if it is not already set, and report it as initialized
+			$meta->content_type("text/xml")->set_initialized();
+
+			return new XML($element, $root_node);
+		}
+	}
+	
+	
+	/**
+	 * Class constructor. You should use the factory instead.
+	 * @param string $element [optional] What to construct from. Could be some xml string, a file name, or a DOMNode
+	 * @param string $root_node [optional] The root node name. To be specified if no driver are used.
+	 * @return XML XML object instance
+	 */
+	public function __construct($element = NULL, $root_node = NULL)
+	{
+		// Create the initial DOMDocument
+		$this->dom_doc = new DOMDocument(XML::$xml_version, Kohana::$charset);
+
+		if ($root_node)
+		{
+			// If a root node is specified, overwrite the current_one
+			$this->root_node = $root_node;
+		}
+
+		// Initialize the document with the given element
+		if (is_string($element))
+		{
+			if (is_file($element) OR Valid::url($element))
+			{
+				// Generate XML from a file
+				$this->dom_doc->load($element);
+			}
+			else
+			{
+				// Generate XML from a string
+				$this->dom_doc->loadXML($element);
+			}
+			// Node is the root node of the document, containing the whole tree
+			$this->dom_node = $this->dom_doc->documentElement;
+		}
+		elseif ($element instanceof DOMNode)
+		{
+			// This is called from another XML instance ( through add_node, or else...)
+			// Let's add that node to the new object node 
+			$this->dom_node = $element;
+
+			// And overwrite the document with that node's owner document
+			$this->dom_doc = $this->dom_node->ownerDocument;
+		}
+		elseif ( ! is_null($this->root_node))
+		{
+			// Create the Root Element from the driver attributes
+			if ($this->meta()->get("namespace", $this->root_node))
+			{
+				$root_node_name = $this->meta()->get("prefix", $this->root_node) ? $this->meta()->get("prefix", $this->root_node).":$this->root_node" : $this->root_node;
+
+				// Create the root node in its prefixed namespace
+				$root_node = $this->dom_doc->createElementNS($this->meta()->get("namespace", $this->root_node), $root_node_name);
+			}
+			else
+			{
+				// Create the root node
+				$root_node = $this->dom_doc->createElement($this->root_node);
+			}
+			
+			// Append the root node to the object DOMDocument, and set the resulting DOMNode as it's node
+			$this->dom_node = $this->dom_doc->appendChild($root_node);
+			
+			// Add other attributes
+			$this->add_attributes($this->dom_node);
+		}
+		else
+		{
+			throw new Kohana_Exception("You have to specify a root_node, either in your driver or in the constructor if you're not using any.");
+		}
+	}
+
+
+	/**
+	 * Adds a node to the document
+	 * @param string $name Name of the node. Prefixed namespaces are handled automatically.
+	 * @param value $value [optional] value of the node (will be filtered). If value is not valid CDATA, 
+	 * it will be wrapped into a CDATA section
+	 * @param array $attributes [optional] array of attributes. Prefixed namespaces are handled automatically.
+	 * @return XML instance for the node that's been added.
+	 */
+	public function add_node($name, $value = NULL, $attributes = array())
+	{	
+		// Trim the name
+		$name = trim($name);
+		
+		// Create the element
+		$node = $this->create_element($name);
+
+		// Add the attributes
+		$this->add_attributes($node, $attributes);
+		
+		// Add the value if provided
+		if ($value !== NULL)
+		{			
+			$value = strval($this->filter($name, $value, $node));
+			
+			if (str_replace(array('<', '>', '&'), "", $value) === $value)
+			{
+				// Value is valid CDATA, let's add it as a new text node
+				$value = $this->dom_doc->createTextNode($value);
+			}
+			else
+			{
+				// We shall create a CDATA section to wrap the text provided
+				$value = $this->dom_doc->createCDATASection($value);
+			}
+			$node->appendChild($value);
+		}
+
+		// return a new XML instance of the same class from the child node
+		$class = get_class($this);
+		return new $class($this->dom_node->appendChild($node));
+	}
+
+
+
+	/**
+	 * Magic get returns the first child node matching the value
+	 * @param string $node_name
+	 * @return mixed If trying to get a node:
+	 * NULL will be return if nothing is matched, 
+	 * A string value is returned if it a text/cdata node is matched
+	 * An XML instance is returned otherwise, allowing chaining.
+	 */
+	public function __get($value)
+	{
+		if ( ! isset($this->$value))
+		{
+			$node = current($this->get($value));
+			
+			if ($node instanceof XML)
+			{
+				// Return the whole XML document
+				return $node;
+			}
+			// We did not match any child nodes
+			return NULL;
+		}
+		parent::__get($value);
+	}
+
+
+
+	/**
+	 * Gets all nodes matching a name and returns them as an array.
+	 * Can also be used to get a pointer to a particular node and then deal with that node as an XML instance.
+	 * @param string $value name of the nodes desired
+	 * @param bool $as_array [optional] whether or not the nodes should be returned as an array
+	 * @return array Multi-dimensional array or array of XML instances
+	 */
+	public function get($value, $as_array = FALSE)
+	{
+		$return = array();
+		
+		$value = $this->meta()->alias($value);
+
+		foreach ($this->dom_node->getElementsByTagName($value) as $item)
+		{
+			if ($as_array)
+			{
+				// Return as array but ignore root node
+				$array = $this->_as_array($item);
+				foreach ($array as $val)
+				{
+					$return[] = $val;
+				}
+			}
+			else
+			{
+				$class = get_class($this);
+				$return[] = new $class($item);
+			}
+		}
+		return $return;
+	}
+
+
+	/**
+	 * Queries the document with an XPath query
+	 * @param string $query XPath query
+	 * @param bool $as_array [optional] whether or not the nodes should be returned as an array
+	 * @return array Multi-dimensional array or array of XML instances
+	 */
+	public function xpath($query, $as_array = TRUE)
+	{
+		$return = array();
+		
+		$xpath = new DOMXPath($this->dom_doc);
+		
+		foreach ($xpath->query($query) as $item)
+		{
+			if ($as_array)
+			{
+				$array = $this->_as_array($item);
+				foreach ($array as $val)
+				{
+					$return[] = $val;
+				}
+			}
+			else
+			{
+				$class = get_class($this);
+				$return[] = new $class($item);
+			}
+		}
+		return $return;
+	}
+
+
+
+	/**
+	 * Exports the document as a multi-dimensional array.
+	 * Handles element with the same name.
+	 * 
+	 * Root node is ignored, as it is known and available in the driver.
+	 * Example : 
+	 * <node_name attr_name="val">
+	 * 		<child_node_name>
+	 * 			value1
+	 * 		</child_node_name>
+	 * 		<child_node_name>
+	 * 			value2
+	 * 		</child_node_name>
+	 * </node_name>
+	 * 
+	 * Here's the resulting array structure :
+	 * array ("node_name" => array(
+	 * 					// array of nodes called "node_name"	
+	 * 					0 => array(
+	 *							// Attributes of that node
+	 *							"xml_attributes" => array(
+	 *											"attr_name" => "val",
+	 *													)
+	 *							// node contents
+	 * 							"child_node_name" => array( 
+	 * 												// array of nodes called "child_node_name"
+	 * 												0 => value1,
+	 * 												1 => value2,
+	 * 														)
+	 * The output is retro-actively convertible to XML using from_array().
+	 * @return array
+	 */
+	public function as_array()
+	{
+		$dom_element = $this->dom_node;
+		
+		$return = array();
+		
+		// This function is run on a whole XML document and this is the root node.
+		// That root node shall be ignored in the array as it driven by the driver and handles document namespaces.
+		foreach($dom_element->childNodes as $dom_child)
+		{
+			if ($dom_child->nodeType == XML_ELEMENT_NODE)
+			{
+				// Let's run through the child nodes
+				$child = $this->_as_array($dom_child);
+
+				foreach ($child as $key => $val)
+				{
+					$return[$key][]=$val;
+				}
+			}
+		}
+		
+		return $return;
+	}
+
+
+
+	/**
+	 * Recursive as_array for child nodes
+	 * @param DOMNode $dom_node
+	 * @return Array
+	 */
+	private function _as_array(DOMNode $dom_node)
+	{
+		// All other nodes shall be parsed normally : attributes then text value and child nodes, running through the XML tree
+		$object_element = array();
+
+		// Get the desired node name for this node
+		$node_name = $this->meta()->key($dom_node->tagName);
+
+		// Get children, run through XML tree
+		if ($dom_node->hasChildNodes())
+		{
+			if (!$dom_node->firstChild->hasChildNodes())
+			{
+				// Get text value
+				$object_element[$node_name] = trim($dom_node->firstChild->nodeValue);
+			}
+
+			foreach($dom_node->childNodes as $dom_child)
+			{
+				if ($dom_child->nodeType === XML_ELEMENT_NODE)
+				{
+					$child = $this->_as_array($dom_child);
+	
+					foreach ($child as $key=>$val)
+					{
+						$object_element[$node_name][$key][]=$val;
+					}
+				}
+			}
+		}
+
+		// Get attributes
+		if ($dom_node->hasAttributes())
+		{
+	 		$object_element[$dom_node->nodeName]['xml_attributes'] = array();
+			foreach($dom_node->attributes as $att_name => $dom_attribute)
+			{
+				// Get the desired name for this attribute
+				$att_name = $this->meta()->key($att_name);
+				$object_element[$node_name]['xml_attributes'][$att_name] = $dom_attribute->value;
+			}
+		}
+		return $object_element;
+	}
+
+
+	/**
+	 * Converts an array to XML. Expected structure is given in as_array().
+	 * However, from_array() is essentially more flexible regarding to the input array structure,
+	 * as we don't have to bother about nodes having the same name.
+	 * Try something logical, that should work as expected.
+	 * @param object $mixed
+	 * @return XML
+	 */
+	public function from_array($array)
+	{
+		$this->_from_array($array, $this->dom_node);
+
+		return $this;
+	}
+
+
+	/**
+	 * Array shall be like : array('element_name' => array( 0 => text, 'xml_attributes' => array()));
+	 * @param object     $mixed
+	 * @param DOMElement $dom_element
+	 * @return 
+	 */
+	protected function _from_array($mixed, DOMElement $dom_element)
+	{
+		if (is_array($mixed))
+		{
+			foreach( $mixed as $index => $mixed_element )
+			{
+				if ( is_numeric($index) )
+				{
+					// If we have numeric keys, we're having multiple children of the same node.
+					// Append the new node to the current node's parent
+					// If this is the first node to add, $node = $dom_element
+					$node = $dom_element;
+					if ( $index != 0 )
+					{
+						// If not, lets create a copy of the node with the same name 
+						$node = $this->create_element($dom_element->tagName);
+						// And append it to the parent node
+						$node = $dom_element->parentNode->appendChild($node);
+					}
+					$this->_from_array($mixed_element, $node);
+				}
+				elseif ($index == "xml_attributes")
+				{
+					// Add attributes to the node
+					$this->add_attributes($dom_element, $mixed_element);
+				}
+				else
+				{
+					// Create a new element with the key as the element name.
+					// Create the element corresponding to the key
+					$node = $this->create_element($index);
+					
+					// Add the driver attributes
+					$this->add_attributes($node);
+
+					// Append it
+					$dom_element->appendChild($node);
+					
+					// Treat the array by recursion
+					$this->_from_array($mixed_element, $node);
+				}
+			}
+		}
+		elseif ($mixed)
+		{
+			// This is a string value that shall be appended as such
+			$mixed = $this->filter($dom_element->tagName, $mixed, $dom_element);
+			$dom_element->appendChild($this->dom_doc->createTextNode($mixed));
+		}
+	}
+
+
+	/**
+	 * This function is used to import another XML instance, or whatever we can construct XML from (string, filename, DOMNode...)
+	 * 
+	 * $xml1 = XML::factory("atom", "<feed><bla>bla</bla></feed>");
+	 * $xml2 = XML::factory("rss", "<test></test>");
+	 * $node_xml2 = $xml2->add_node("key");
+	 * 
+	 * // outputs "<test><key><feed><bla>bla</bla></feed></key></test>"
+	 * $node_xml2->import($xml1)->render();
+	 * 
+	 * // outputs "<feed><bla>bla</bla></feed><key><feed><bla>bla</bla></feed></key>"
+	 * $xml1->import($xml2->get("key"))->render();
+	 * 
+	 * @param object $xml XML instance or DOMNode
+	 * @return object $this Chainable function
+	 */
+	public function import($xml)
+	{
+		if (! $xml instanceof XML)
+		{
+			// Attempt to construct XML from the input
+			$class = get_class($this);
+			$xml = new $class($xml);
+		}
+		// Import the node, and all its children, to the document
+		$node = $this->dom_doc->importNode($xml->dom_node, TRUE);
+		$this->dom_node->appendChild($node);
+		
+		return $this;
+	}
+
+
+	/**
+	 * Creates an element, sorts out namespaces (default / prefixed)
+	 * @param string $name element name
+	 * @return DOMElement
+	 */
+	private function create_element($name)
+	{
+		$name = $this->meta()->alias($name);
+
+		// Let's check if the element name has a namespace, and if this prefix is defined in our driver
+		if ($namespace_uri = $this->meta()->get("namespace", $name))
+		{
+			if (stristr($name, ":"))
+			{
+				// Separate the namespace prefix and the name
+				list($prefix, $name) = explode(":", $name);
+
+				// Register the prefixed namespace in the document root
+				$this->dom_doc->documentElement->setAttributeNS("http://www.w3.org/2000/xmlns/" ,"xmlns:".$prefix, $namespace_uri);
+
+				// Create the prefixed element within that namespace
+				$node = $this->dom_doc->createElementNS($namespace_uri, $prefix.":".$name);
+			}
+			else
+			{
+				// Create the element normally
+				$node = $this->dom_doc->createElement($name);
+
+				// Add the new default namespace as an attribute.
+				$node->setAttribute("xmlns", $namespace_uri);
+			}
+		}
+		else
+		{
+			// Simply create the element
+			$node = $this->dom_doc->createElement($name);
+		}
+		return $node;
+	}
+
+
+	/**
+	 * Applies attributes to a node
+	 * @param DOMNode $node
+	 * @param array  $attributes as key => value
+	 * @return DOMNode
+	 */
+	private function add_attributes(DOMNode $node, $attributes = array())
+	{
+		$node_name = $this->meta()->alias($node->tagName);
+
+		if ($this->meta()->get("attributes", $node_name))
+		{
+			$attributes = array_merge($this->meta()->get("attributes", $node_name), $attributes);
+		}
+
+		foreach ($attributes as $key => $val)
+		{
+			// Trim elements
+			$key = $this->meta()->alias(trim($key));
+			$val = $this->filter($key, trim($val), $node);
+
+			// Set the attribute
+			// Let's check if the attribute name has a namespace prefix, and if this prefix is defined in our driver
+			if ($namespace_uri = $this->meta()->get("namespace", $key)
+				AND stristr($name, ":"))
+			{
+				// Separate the namespace prefix and the name
+				list($prefix, $name) = explode(":", $name);
+
+				// Register the prefixed namespace
+				$this->dom_node->setAttributeNS("http://www.w3.org/2000/xmlns/" ,"xmlns:".$prefix, $namespace_uri);
+
+				// Add the prefixed attribute within that namespace
+				$node->setAttributeNS($namespace_uri, $key, $val);
+			}
+			else
+			{
+				// Simply add the attribute
+				$node->setAttribute($key, $val);
+			}
+		}
+		return $node;
+	}
+
+
+	/**
+	 * Applies filter on a value.
+	 * These filters are callbacks usually defined in the driver.
+	 * They allow to format dates, links, standard stuff, and play 
+	 * as you wish with the value before it is added to the document.
+	 * 
+	 * You could even extend it and modify the node name.
+	 * 
+	 * @param string $name
+	 * @param string $value
+	 * @return string $value formatted value
+	 */
+	protected function filter($name, $value, &$node)
+	{
+		$name = $this->meta()->alias($name);
+		
+		if ($this->meta()->get("filter", $name))
+		{
+			return call_user_func(array($this, $this->meta()->get("filter", $name)), $value, $node);
+		}
+		return $value;
+	}
+
+
+	/**
+	 * This is a classic filter that takes a uri and makes a proper link
+	 * @param object $value
+	 * @return $value
+	 */
+	public function normalize_uri($value, $node)
+	{
+		if (strpos($value, '://') === FALSE)
+		{
+			if (strlen(URL::base()) > 1 AND stristr($value, URL::base()))
+			{
+				// Make sure the path is not base related
+				$value = str_replace(URL::base(), '', $value);
+			}
+			// Convert URIs to URLs
+			$value = URL::site($value, TRUE);
+		}
+		return $value;
+	}
+
+
+	/**
+	 * Another classic filter to deal with boolean
+	 * @param boolean $value
+	 * @return string $value, true or false
+	 */
+	public function normalize_bool($value)
+	{
+		return $value ? "true" : "false";
+	}
+
+
+	/**
+	 * Returns this drivers XML metadata
+	 * @return XML_Meta
+	 */
+	public function meta()
+	{
+		return XML::$_metas[strtolower(get_class($this))];
+	}
+
+
+	/**
+	 * Outputs nicely formatted XML when converting as string
+	 * @return string
+	 */
+	public function __toString()
+	{
+		return $this->render(TRUE);
+	}
+
+
+	/**
+	 * Render the XML.
+	 * @param boolean $formatted [optional] Should the output be formatted and indented ?
+	 * @return string
+	 */
+	public function render($formatted = FALSE)
+	{
+		$this->dom_doc->formatOutput = $formatted;
+		return $this->dom_doc->saveXML();
+	}
+
+
+	/**
+	 * Outputs the XML in a file
+	 * @param string filename
+	 * @return 
+	 */
+	public function export($file)
+	{
+		return $this->dom_doc->save($file);
+	}
+
+
+	/**
+	 * Returns this instance node value, if the dom_node is a text node
+	 * 
+	 * @return string
+	 */
+	public function value()
+	{
+		if ($this->dom_node->hasChildNodes() AND $this->dom_node->firstChild->nodeType === XML_TEXT_NODE)
+		{
+			return $this->dom_node->nodeValue;
+		}
+		return NULL;
+	}
+
+
+	/**
+	 * Returns this instance node value
+	 * 
+	 * @return string|array attributes as array of attribute value if a name is specified
+	 */
+	public function attributes($attribute_name = NULL)
+	{
+		if ($attribute_name === NULL)
+		{
+			// Return an array of attributes
+			$attributes = array();
+
+			if ($this->dom_node->hasAttributes())
+			{
+				foreach ($this->dom_node->attributes as $attribute)
+				{
+					$attributes[$attribute->name] = $attribute->value;
+				}
+			}
+			return $attributes;
+		}
+
+		// Simply return the attribute value
+		return $this->dom_node->getAttribute($attribute_name);
+	}
+} // End XML_Core

modules/xml/classes/XML/Driver/Atom.php

@@ -0,0 +1,101 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ *	Document   : atom.php
+ *	Created on : 1 mai 2009, 13:03:03
+ *	@author Cedric de Saint Leger <c.desaintleger@gmail.com>
+ *
+ *	Description:
+ *      Atom driver
+ */
+
+class XML_Driver_Atom extends XML
+{
+	public $root_node = 'feed';
+
+
+	protected static function initialize(XML_Meta $meta)
+	{
+		$meta	->content_type("application/atom+xml")
+				->nodes (
+							array(
+								"feed"				=> array("namespace"	=> "http://www.w3.org/2005/Atom"),
+							//	"entry"				=> array("namespace"	=> "http://www.w3.org/2005/Atom"),
+								"href"				=> array("filter"		=> "normalize_uri"),
+								"link"				=> array("filter"		=> "normalize_uri"),
+								"logo"				=> array("filter"		=> "normalize_uri"),
+								"icon"				=> array("filter"		=> "normalize_uri"),
+								"id"				=> array("filter"		=> "normalize_uri"),
+								"updated"			=> array("filter"		=> "normalize_datetime"),
+								"published"			=> array("filter"		=> "normalize_datetime"),
+								"startDate"			=> array("filter" 		=> "normalize_date"),
+								'endDate'			=> array("filter" 		=> "normalize_date"),
+								"summary"			=> array("filter"		=> "normalize_text"),
+								"subtitle"			=> array("filter"		=> "normalize_text"),
+								"title"				=> array("filter"		=> "normalize_text"),
+								"content"			=> array("filter"		=> "normalize_text")
+								)
+						);
+	}
+
+
+	public function add_person($type, $name, $email = NULL, $uri = NULL)
+	{
+		$author = $this->add_node($type);
+		$author->add_node("name", $name);
+		if ($email)
+		{
+			$author->add_node("email", $email);
+		}
+		if ($uri)
+		{
+			$author->add_node("uri", $uri);
+		}
+		return $this;
+	}
+
+
+	public function add_content(XML $xml_document)
+	{
+		$this->add_node("content", NULL, array("type" => $xml_document->meta()->content_type()))->import($xml_document);
+		return $this;
+	}
+
+
+	public function normalize_text($value, $node)
+	{
+		if (strpos($value, "<") >= 0 AND strpos($value, ">") > 0)
+		{
+			// Assume type = html
+			$node->setAttribute("type", "html");
+		}
+		else
+		{
+			$node->setAttribute("type", "text");
+		}
+		return $value;
+	}
+
+
+	public function normalize_datetime($value)
+	{
+		if ( ! is_numeric($value))
+		{
+			$value = strtotime($value);
+		}
+
+		// Convert timestamps to RFC 3339 formatted datetime
+		return date(DATE_RFC3339, $value);
+	}
+
+
+	public function normalize_date($value)
+	{
+		if ( ! is_numeric($value))
+		{
+			$value = strtotime($value);
+		}
+
+		// Convert timestamps to RFC 3339 formatted dates
+		return date("Y-m-d", $value);
+	}
+}

modules/xml/classes/XML/Driver/Rss2.php

@@ -0,0 +1,57 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ *	Document   : rss2.php
+ *	Created on : 1 mai 2009, 13:03:03
+ *	@author Cedric de Saint Leger <c.desaintleger@gmail.com>
+ *
+ *	Description:
+ *      RSS2 driver
+ */
+
+class XML_Driver_Rss2 extends XML
+{
+	public $root_node = 'rss';
+
+	protected static function initialize(XML_Meta $meta)
+	{
+		$meta	->content_type("application/rss+xml")
+				->nodes (
+							array(
+								"rss"				=> array("attributes"	=> array("version" => "2.0")),
+								"title"				=> array("filter"		=> "normalize_text"),
+								"description"		=> array("filter"		=> "normalize_text"),
+								"link"				=> array("filter"		=> "normalize_uri"),
+								"atom:link"			=> array("attributes"	=> array(
+																					"rel" => "self",
+																					"type" => "application/rss+xml",
+																			//		"href" => URL::site(Request::initial()->uri(), TRUE)
+																				),
+															 "namespace"	=> "http://www.w3.org/2005/Atom"),
+								"href"				=> array("filter"		=> "normalize_uri"),
+								"docs"				=> array("filter"		=> "normalize_uri"),
+								"guid"				=> array("filter"		=> "normalize_uri"),
+								"pubDate"			=> array("filter"		=> "normalize_date"),
+								"lastBuildDate"		=> array("filter"		=> "normalize_date")
+								)
+						);
+	}
+
+
+	public function normalize_date($value)
+	{
+		if ( ! is_numeric($value))
+		{
+			$value = strtotime($value);
+		}
+
+		// Convert timestamps to RFC 822 formatted dates, with 4 digits year
+		return date(DATE_RSS, $value);
+	}
+
+
+	public function normalize_text($value)
+	{
+		// Strip HTML tags
+		return strip_tags($value);
+	}
+}

modules/xml/classes/XML/Driver/Xrds.php

@@ -0,0 +1,55 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ *	Document   : xrds.php
+ *	Created on : 1 mai 2009, 13:03:03
+ *	@author Cedric de Saint Leger <c.desaintleger@gmail.com>
+ *
+ *	Description:
+ *      XRDS driver. For Service Discovery.
+ */
+
+class XML_Driver_XRDS extends XML
+{
+	public $root_node = 'xrds:XRDS';
+						
+	protected static function initialize(XML_Meta $meta)
+	{
+		$meta	->content_type("application/xrds+xml")
+				->nodes (
+							array(
+								"xrds:XRDS"			=> array("namespace"	=> 'xri://$xrds', "attributes"	=> array("xmlns" => 'xri://$xrd*($v*2.0)')),
+								"LocalID"			=> array("filter"		=> "normalize_uri"),
+								"openid:Delegate"	=> array("filter"		=> "normalize_uri", "namespace" => "http://openid.net/xmlns/1.0"),
+								"URI"				=> array("filter"		=> "normalize_uri"),
+								)
+						);
+	}
+								
+								
+	public function add_service($type, $uri, $priority = NULL)
+	{
+		if (! is_null($priority))
+		{
+			$priority = array("priority"	=> $priority);
+		}
+		else
+		{
+			$priority = array();
+		}
+		
+		$service_node = $this->add_node("Service", NULL, $priority);
+
+		if (! is_array($type))
+		{
+			$type = array($type);
+		}
+		
+		foreach ($type as $t)
+		{
+			$service_node->add_node("Type", $t);
+		}
+		$service_node->add_node("URI", $uri);
+		
+		return $service_node;
+	}
+}

modules/xml/classes/XML/Meta.php

@@ -0,0 +1,12 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ *	Document   : meta.php
+ *	Created on : 1 mai 2009, 13:03:03
+ *	@author Cedric de Saint Leger <c.desaintleger@gmail.com>
+ *
+ *	Description:
+ *      XML_Meta class. Use this to override XML_Meta_Core
+ */
+
+ class XML_Meta extends XML_Meta_Core
+ {}

modules/xml/classes/XML/Meta/Core.php

@@ -0,0 +1,187 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ *	Document   : meta.php
+ *	Created on : 1 mai 2009, 13:03:03
+ *	@author Cedric de Saint Leger <c.desaintleger@gmail.com>
+ *
+ *	Description:
+ *      XML_Meta_Core class. This class contains XML drivers metadata
+ */
+
+ class XML_Meta_Core
+ {
+	/**
+	 * @var array assoc array alias => $node_name
+	 * This is used to abstract the node names
+	 */
+	protected $nodes = array();
+	
+	/**
+	 * @var array whole node configuration array
+	 * array("node_name" => array(
+	 * 								// Effective node name in the XML document. 
+	 * 								// This name is abstracted and "node_name" is always used when dealing with the object.
+	 * 								"node" => "effective_node_name",
+	 * 								// Defines a namespace URI for this node
+	 * 								"namespace" => "http://www.namespace.uri", 
+	 * 								// Defines a prefix for the namespace above. If not defined, namespace is interpreted as a default namespace
+	 * 								"prefix" => "ns",
+	 * 								// Defines a callback function to filter/normalize the value
+	 * 								"filter" => "filter_function_name",
+	 * 								// Array of attributes
+	 * 								"attributes" => array("default_attribute1" => "value")
+	 * 							),
+	 * 		"alias"		=> "node_name",
+	 * 		)
+	 */
+	protected $nodes_config = array();
+	
+	/**
+	 * @var string content type for HTML headers
+	 */
+	protected $content_type;
+	
+	/**
+	 * @var boolean whether the object is initialized
+	 */
+	protected $_initialized = FALSE;
+
+
+	/**
+	 * Returns the name of a node, sort out aliases
+	 * @param string $name
+	 * @return string $node_name
+	 */
+	public function alias($name)
+	{
+		if (isset($this->nodes_config[$name]))
+		{
+			if ( ! is_array($this->nodes_config[$name]))
+			{
+				$name = $this->nodes_config[$name];
+			}
+		}
+		
+		return Arr::get($this->nodes, $name, $name);
+	}
+
+	/**
+	 * Returns the value of a meta key for a given node name
+	 * exemple $this->get('attributes', 'feed') will return all the attributes set up in the meta
+	 * for the node feed.
+	 * @param object $key meta key
+	 * @param object $name node name
+	 * @return meta value or NULL if not set
+	 */
+	public function get($key, $name) 
+	{
+		$name = $this->alias($name);
+
+		if (isset($this->nodes_config[$name]) AND is_array($this->nodes_config[$name]) AND array_key_exists($key, $this->nodes_config[$name]))
+		{
+			return $this->nodes_config[$name][$key];
+		}
+		return NULL;
+	}
+
+
+	/**
+	 * Set nodes config attribute
+	 * Use it this way :
+	 * nodes(array("node_name" => array("namespace" => "http://www.namespace.uri", "prefix" => "ns", "filter" => "filter_function_name", "attributes" => array("default_attribute1" => "value")))),
+	 * OR to set up node alias names :
+	 * nodes(array("alias" => "node_name"));
+	 * 
+	 * @param array $nodes array formatted as mentionned above
+	 * @param bool $overwrite [optional] Overwrite current values if they are set ?
+	 * @return object $this
+	 */
+	public function nodes(Array $nodes)
+	{
+		$this->nodes_config = $this->_initialized ?
+									array_merge($nodes, $this->nodes_config) : 
+									array_merge($this->nodes_config, $nodes);
+									
+		$this->generate_nodes_map();
+		
+		return $this;
+	}
+
+
+	/**
+	 * Sets the content type for headers
+	 * @param string $type 
+	 * @return object $this
+	 */
+	public function content_type($type = NULL)
+	{
+		if ($type)
+		{
+			$this->content_type = $this->_initialized ?
+									$type :
+									$this->content_type ? 
+											$this->content_type : 
+											$type;
+		}
+		else
+		{
+			return $this->content_type;
+		}
+
+		return $this;
+	}
+	
+	
+	/**
+	 * Returns the key name corresponding to a node name
+	 * This is used when using as_array(), to return array keys corresponding to the node names
+	 * @param object $node_name
+	 * @return 
+	 */
+	public function key($node_name)
+	{
+		// Extract the name if it is prefixed
+		$expl = explode(":", $node_name);
+		$node_name = count($expl) > 1 ? end($expl) : current($expl);
+		
+		if (in_array($node_name, $this->nodes))
+		{
+			return current(array_keys($this->nodes, $node_name));
+		}
+		return $node_name;
+	}
+
+	
+	/**
+	 * Generates - or re-generates the node map
+	 * @return object $this
+	 */
+	public function generate_nodes_map()
+	{
+		$map = array();
+		foreach ($this->nodes_config as $key => $config)
+		{
+			if (is_array($config))
+			{
+				if (isset ($config["node"]))
+				{
+					$map[$key] = $config["node"];
+				}
+			}
+		}
+		$this->nodes = $map;
+		return $this;
+	}
+	
+	/**
+	 * Reports the Meta as initialized.
+	 * This basically allows Meta methods to overwrite existing value, if they are called explicitely
+	 * @return object $this
+	 */
+	public function set_initialized()
+	{
+		$this->_initialized = TRUE;
+		return $this;
+	}
+	
+}