router.php

<?php
/**
 * Parses the request URL into controller, action, and parameters.
 *
 * PHP 5
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP(tm) v 0.2.9
 * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 */

App::import('Core', 'CakeRequest');
App::import('Core', 'route/CakeRoute');

/**
 * Parses the request URL into controller, action, and parameters.
 *
 * @package       cake
 * @subpackage    cake.cake.libs
 */
class Router {

/**
 * Array of routes connected with Router::connect()
 *
 * @var array
 * @access public
 */
	public static $routes = array();

/**
 * List of action prefixes used in connected routes.
 * Includes admin prefix
 *
 * @var array
 * @access private
 */
	protected static $_prefixes = array();

/**
 * Directive for Router to parse out file extensions for mapping to Content-types.
 *
 * @var boolean
 * @access private
 */
	protected static $_parseExtensions = false;

/**
 * List of valid extensions to parse from a URL.  If null, any extension is allowed.
 *
 * @var array
 * @access private
 */
	protected static $_validExtensions = array();

/**
 * 'Constant' regular expression definitions for named route elements
 *
 */
	const ACTION = 'index|show|add|create|edit|update|remove|del|delete|view|item';
	const YEAR = '[12][0-9]{3}';
	const MONTH = '0[1-9]|1[012]';
	const DAY = '0[1-9]|[12][0-9]|3[01]';
	const ID = '[0-9]+';
	const UUID = '[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{12}';

	private static $__named = array(
		'Action' => Router::ACTION,
		'Year' => Router::YEAR,
		'Month' => Router::MONTH,
		'Day' => Router::DAY,
		'ID' => Router::ID,
		'UUID' => Router::UUID
	);

/**
 * Stores all information necessary to decide what named arguments are parsed under what conditions.
 *
 * @var string
 * @access public
 */
	public static $named = array(
		'default' => array('page', 'fields', 'order', 'limit', 'recursive', 'sort', 'direction', 'step'),
		'greedy' => true,
		'separator' => ':',
		'rules' => false,
	);

/**
 * The route matching the URL of the current request
 *
 * @var array
 * @access private
 */
	protected static $_currentRoute = array();

/**
 * Default HTTP request method => controller action map.
 *
 * @var array
 * @access private
 */
	protected static $_resourceMap = array(
		array('action' => 'index',	'method' => 'GET',		'id' => false),
		array('action' => 'view',	'method' => 'GET',		'id' => true),
		array('action' => 'add',	'method' => 'POST',		'id' => false),
		array('action' => 'edit',	'method' => 'PUT', 		'id' => true),
		array('action' => 'delete',	'method' => 'DELETE',	'id' => true),
		array('action' => 'edit',	'method' => 'POST', 	'id' => true)
	);

/**
 * List of resource-mapped controllers
 *
 * @var array
 */
	protected static $_resourceMapped = array();

/**
 * Maintains the request object stack for the current request.
 * This will contain more than one request object when requestAction is used.
 *
 * @var array
 */
	protected static $_requests = array();

/**
 * Keeps Router state to determine if default routes have already been connected
 *
 * @var boolean
 * @access private
 */
	protected static $_defaultsMapped = false;

/**
 * Keeps track of whether the connection of default routes is enabled or disabled.
 *
 * @var boolean
 */
	protected static $_connectDefaults = true;

/**
 * Initial state is popualated the first time reload() is called which is at the bottom
 * of this file.  This is a cheat as get_class_vars() returns the value of static vars even if they
 * have changed.
 *
 * @var array
 */
	protected static $_initialState = array();

/**
 * Sets the Routing prefixes.
 *
 * @return void
 * @access private
 */
	protected static function _setPrefixes() {
		$routing = Configure::read('Routing');
		if (!empty($routing['prefixes'])) {
			self::$_prefixes = array_merge(self::$_prefixes, (array)$routing['prefixes']);
		}
	}

/**
 * Gets the named route elements for use in app/config/routes.php
 *
 * @return array Named route elements
 * @see Router::$__named
 */
	public static function getNamedExpressions() {
		return self::$__named;
	}

/**
 * Connects a new Route in the router.
 *
 * Routes are a way of connecting request urls to objects in your application.  At their core routes
 * are a set or regular expressions that are used to match requests to destinations.
 *
 * Examples:
 *
 * `Router::connect('/:controller/:action/*');`
 *
 * The first parameter will be used as a controller name while the second is used as the action name.
 * the '/*' syntax makes this route greedy in that it will match requests like `/posts/index` as well as requests
 * like `/posts/edit/1/foo/bar`.
 *
 * `Router::connect('/home-page', array('controller' => 'pages', 'action' => 'display', 'home'));`
 *
 * The above shows the use of route parameter defaults. And providing routing parameters for a static route.
 *
 * {{{
 * Router::connect(
 *   '/:lang/:controller/:action/:id',
 *   array(),
 *   array('id' => '[0-9]+', 'lang' => '[a-z]{3}')
 * );
 * }}}
 *
 * Shows connecting a route with custom route parameters as well as providing patterns for those parameters.
 * Patterns for routing parameters do not need capturing groups, as one will be added for each route params.
 *
 * $options offers two 'special' keys. `pass` and `persist` have special meaning in the $options array.
 *
 * `pass` is used to define which of the routed parameters should be shifted into the pass array.  Adding a
 * parameter to pass will remove it from the regular route array. Ex. `'pass' => array('slug')`
 *
 * `persist` is used to define which route parameters should be automatically included when generating
 * new urls. You can override peristent parameters by redifining them in a url or remove them by
 * setting the parameter to `false`.  Ex. `'persist' => array('lang')`
 *
 * @param string $route A string describing the template of the route
 * @param array $defaults An array describing the default route parameters. These parameters will be used by default
 *   and can supply routing parameters that are not dynamic. See above.
 * @param array $options An array matching the named elements in the route to regular expressions which that
 *   element should match.  Also contains additional parameters such as which routed parameters should be
 *   shifted into the passed arguments. As well as supplying patterns for routing parameters.
 * @see routes
 * @return array Array of routes
 * @throws RouterException
 */
	public static function connect($route, $defaults = array(), $options = array()) {
		foreach (self::$_prefixes as $prefix) {
			if (isset($defaults[$prefix])) {
				$defaults['prefix'] = $prefix;
				break;
			}
		}
		if (isset($defaults['prefix'])) {
			self::$_prefixes[] = $defaults['prefix'];
			self::$_prefixes = array_keys(array_flip(self::$_prefixes));
		}
		$defaults += array('plugin' => null);
		if (empty($options['action'])) {
			$defaults += array('action' => 'index'); 
		}
		$routeClass = 'CakeRoute';
		if (isset($options['routeClass'])) {
			$routeClass = $options['routeClass'];
			if (!is_subclass_of($routeClass, 'CakeRoute')) {
				throw new RouterException(__('Route classes must extend CakeRoute'));
			}
			unset($options['routeClass']);
			if ($routeClass == 'RedirectRoute' && isset($defaults['redirect'])) {
				$defaults = $defaults['redirect'];
			}
		}
		self::$routes[] = new $routeClass($route, $defaults, $options);
		return self::$routes;
	}

/**
 * Connects a new redirection Route in the router.
 *
 * Redirection routes are different from normal routes as they perform an actual
 * header redirection if a match is found. The redirection can occur within your
 * application or redirect to an outside location.
 *
 * Examples:
 *
 * `Router::redirect('/home/*', array('controller' => 'posts', 'action' => 'view', array('persist' => true));`
 *
 * Redirects /home/* to /posts/view and passes the parameters to /posts/view.  Using an array as the 
 * redirect destination allows you to use other routes to define where a url string should be redirected ot.
 *
 * `Router::redirect('/posts/*', 'http://google.com', array('status' => 302));`
 *
 * Redirects /posts/* to http://google.com with a HTTP status of 302
 *
 * ### Options:
 *
 * - `status` Sets the HTTP status (default 301)
 * - `persist` Passes the params to the redirected route, if it can.  This is useful with greedy routes,
 *   routes that end in `*` are greedy.  As you can remap urls and not loose any passed/named args.
 *
 * @param string $route A string describing the template of the route
 * @param array $url A url to redirect to. Can be a string or a Cake array-based url
 * @param array $options An array matching the named elements in the route to regular expressions which that
 *   element should match.  Also contains additional parameters such as which routed parameters should be
 *   shifted into the passed arguments. As well as supplying patterns for routing parameters.
 * @see routes
 * @return array Array of routes
 */
	public static function redirect($route, $url, $options = array()) {
		App::import('Core', 'route/RedirectRoute');
		$options['routeClass'] = 'RedirectRoute';
		if (is_string($url)) {
			$url = array('redirect' => $url);
		}
		return self::connect($route, $url, $options);
	}

/**
 * Specifies what named parameters CakePHP should be parsing out of incoming urls. By default
 * CakePHP will parse every named parameter out of incoming URLs.  However, if you want to take more
 * control over how named parameters are parsed you can use one of the following setups:
 *
 * Do not parse any named parameters:
 *
 * {{{ Router::connectNamed(false); }}}
 *
 * Parse only default parameters used for CakePHP's pagination:
 *
 * {{{ Router::connectNamed(false, array('default' => true)); }}}
 *
 * Parse only the page parameter if its value is a number:
 *
 * {{{ Router::connectNamed(array('page' => '[\d]+'), array('default' => false, 'greedy' => false)); }}}
 *
 * Parse only the page parameter no matter what.
 *
 * {{{ Router::connectNamed(array('page'), array('default' => false, 'greedy' => false)); }}}
 *
 * Parse only the page parameter if the current action is 'index'.
 *
 * {{{
 * Router::connectNamed(
 *    array('page' => array('action' => 'index')),
 *    array('default' => false, 'greedy' => false)
 * );
 * }}}
 *
 * Parse only the page parameter if the current action is 'index' and the controller is 'pages'.
 *
 * {{{
 * Router::connectNamed(
 *    array('page' => array('action' => 'index', 'controller' => 'pages')),
 *    array('default' => false, 'greedy' => false)
 * ); 
 * }}}
 *
 * ### Options
 *
 * - `greedy` Setting this to true will make Router parse all named params.  Setting it to false will 
 *    parse only the connected named params.
 * - `default` Set this to true to merge in the default set of named parameters.
 * - `reset` Set to true to clear existing rules and start fresh.
 * - `separator` Change the string used to separate the key & value in a named parameter.  Defaults to `:`
 *
 * @param array $named A list of named parameters. Key value pairs are accepted where values are 
 *    either regex strings to match, or arrays as seen above.
 * @param array $options Allows to control all settings: separator, greedy, reset, default
 * @return array
 */
	public static function connectNamed($named, $options = array()) {
		if (isset($options['separator'])) {
			self::$named['separator'] = $options['separator'];
			unset($options['separator']);
		}

		if ($named === true || $named === false) {
			$options = array_merge(array('default' => $named, 'reset' => true, 'greedy' => $named), $options);
			$named = array();
		} else {
			$options = array_merge(array('default' => false, 'reset' => false, 'greedy' => true), $options);
		}

		if ($options['reset'] == true || self::$named['rules'] === false) {
			self::$named['rules'] = array();
		}

		if ($options['default']) {
			$named = array_merge($named, self::$named['default']);
		}

		foreach ($named as $key => $val) {
			if (is_numeric($key)) {
				self::$named['rules'][$val] = true;
			} else {
				self::$named['rules'][$key] = $val;
			}
		}
		self::$named['greedy'] = $options['greedy'];
		return self::$named;
	}

/**
 * Tell router to connect or not connect the default routes.
 *
 * If default routes are disabled all automatic route generation will be disabled
 * and you will need to manually configure all the routes you want.
 *
 * @param boolean $connect Set to true or false depending on whether you want or don't want default routes.
 * @return void
 */
	public static function defaults($connect = true) {
		self::$_connectDefaults = $connect;
	}

/**
 * Creates REST resource routes for the given controller(s)
 *
 * ### Options:
 *
 * - 'id' - The regular expression fragment to use when matching IDs.  By default, matches
 *    integer values and UUIDs.
 * - 'prefix' - URL prefix to use for the generated routes.  Defaults to '/'.
 *
 * @param mixed $controller A controller name or array of controller names (i.e. "Posts" or "ListItems")
 * @param array $options Options to use when generating REST routes
 * @return array Array of mapped resources
 */
	public static function mapResources($controller, $options = array()) {
		$options = array_merge(array('prefix' => '/', 'id' => self::$__named['ID'] . '|' . self::$__named['UUID']), $options);
		$prefix = $options['prefix'];

		foreach ((array)$controller as $ctlName) {
			$urlName = Inflector::underscore($ctlName);

			foreach (self::$_resourceMap as $params) {
				extract($params);
				$url = $prefix . $urlName . (($id) ? '/:id' : '');

				Router::connect($url,
					array('controller' => $urlName, 'action' => $action, '[method]' => $params['method']),
					array('id' => $options['id'], 'pass' => array('id'))
				);
			}
			self::$_resourceMapped[] = $urlName;
		}
		return self::$_resourceMapped;
	}

/**
 * Returns the list of prefixes used in connected routes
 *
 * @return array A list of prefixes used in connected routes
 */
	public static function prefixes() {
		return self::$_prefixes;
	}

/**
 * Parses given URL string.  Returns 'routing' parametets for that url.
 *
 * @param string $url URL to be parsed
 * @return array Parsed elements from URL
 */
	public static function parse($url) {
		if (!self::$_defaultsMapped && self::$_connectDefaults) {
			self::__connectDefaultRoutes();
		}
		$out = array(
			'pass' => array(),
			'named' => array()
		);

		$r = $ext = null;

		if ($url && strpos($url, '/') !== 0) {
			$url = '/' . $url;
		}
		if (strpos($url, '?') !== false) {
			$url = substr($url, 0, strpos($url, '?'));
		}

		extract(self::__parseExtension($url));

		for ($i = 0, $len = count(self::$routes); $i < $len; $i++) {
			$route =& self::$routes[$i];

			if (($r = $route->parse($url)) !== false) {
				self::$_currentRoute[] =& $route;

				$params = $route->options;
				$argOptions = array();

				if (array_key_exists('named', $params)) {
					$argOptions['named'] = $params['named'];
					unset($params['named']);
				}
				if (array_key_exists('greedy', $params)) {
					$argOptions['greedy'] = $params['greedy'];
					unset($params['greedy']);
				}
				$out = $r;

				if (isset($out['_args_'])) {
					$argOptions['context'] = array('action' => $out['action'], 'controller' => $out['controller']);
					$parsedArgs = self::getArgs($out['_args_'], $argOptions);
					$out['pass'] = array_merge($out['pass'], $parsedArgs['pass']);
					$out['named'] = $parsedArgs['named'];
					unset($out['_args_']);
				}

				if (isset($params['pass'])) {
					$j = count($params['pass']);
					while($j--) {
						if (isset($out[$params['pass'][$j]])) {
							array_unshift($out['pass'], $out[$params['pass'][$j]]);
						}
					}
				}
				break;
			}
		}

		if (!empty($ext) && !isset($out['url']['ext'])) {
			$out['url']['ext'] = $ext;
		}
		return $out;
	}

/**
 * Parses a file extension out of a URL, if Router::parseExtensions() is enabled.
 *
 * @param string $url
 * @return array Returns an array containing the altered URL and the parsed extension.
 * @access private
 */
	private static function __parseExtension($url) {
		$ext = null;

		if (self::$_parseExtensions) {
			if (preg_match('/\.[0-9a-zA-Z]*$/', $url, $match) === 1) {
				$match = substr($match[0], 1);
				if (empty(self::$_validExtensions)) {
					$url = substr($url, 0, strpos($url, '.' . $match));
					$ext = $match;
				} else {
					foreach (self::$_validExtensions as $name) {
						if (strcasecmp($name, $match) === 0) {
							$url = substr($url, 0, strpos($url, '.' . $name));
							$ext = $match;
							break;
						}
					}
				}
			}
			if (empty($ext)) {
				$ext = 'html';
			}
		}
		return compact('ext', 'url');
	}

/**
 * Connects the default, built-in routes, including prefix and plugin routes. The following routes are created
 * in the order below:
 *
 * For each of the Routing.prefixes the following routes are created. Routes containing `:plugin` are only
 * created when your application has one or more plugins.
 *
 * - `/:prefix/:plugin` a plugin shortcut route.
 * - `/:prefix/:plugin/:action/*` a plugin shortcut route.
 * - `/:prefix/:plugin/:controller`
 * - `/:prefix/:plugin/:controller/:action/*`
 * - `/:prefix/:controller`
 * - `/:prefix/:controller/:action/*`
 *
 * If plugins are found in your application the following routes are created:
 *
 * - `/:plugin` a plugin shortcut route.
 * - `/:plugin/:action/*` a plugin shortcut route.
 * - `/:plugin/:controller`
 * - `/:plugin/:controller/:action/*`
 *
 * And lastly the following catch-all routes are connected.
 *
 * - `/:controller'
 * - `/:controller/:action/*'
 *
 * You can disable the connection of default routes with Router::defaults().
 *
 * @return void
 * @access private
 */
	private static function __connectDefaultRoutes() {
		if ($plugins = App::objects('plugin')) {
			App::import('Core', 'route/PluginShortRoute');
			foreach ($plugins as $key => $value) {
				$plugins[$key] = Inflector::underscore($value);
			}
			$pluginPattern = implode('|', $plugins);
			$match = array('plugin' => $pluginPattern);
			$shortParams = array('routeClass' => 'PluginShortRoute', 'plugin' => $pluginPattern);

			foreach (self::$_prefixes as $prefix) {
				$params = array('prefix' => $prefix, $prefix => true);
				$indexParams = $params + array('action' => 'index');
				self::connect("/{$prefix}/:plugin", $indexParams, $shortParams);
				self::connect("/{$prefix}/:plugin/:controller", $indexParams, $match);
				self::connect("/{$prefix}/:plugin/:controller/:action/*", $params, $match);
			}
			self::connect('/:plugin', array('action' => 'index'), $shortParams);
			self::connect('/:plugin/:controller', array('action' => 'index'), $match);
			self::connect('/:plugin/:controller/:action/*', array(), $match);
		}

		foreach (self::$_prefixes as $prefix) {
			$params = array('prefix' => $prefix, $prefix => true);
			$indexParams = $params + array('action' => 'index');
			self::connect("/{$prefix}/:controller", $indexParams);
			self::connect("/{$prefix}/:controller/:action/*", $params);
		}
		self::connect('/:controller', array('action' => 'index'));
		self::connect('/:controller/:action/*');

		if (self::$named['rules'] === false) {
			self::connectNamed(true);
		}
		self::$_defaultsMapped = true;
	}

/**
 * Takes parameter and path information back from the Dispatcher, sets these
 * parameters as the current request parameters that are merged with url arrays 
 * created later in the request.
 *
 * Will accept either a CakeRequest object or an array of arrays. Support for
 * accepting arrays may be removed in the future.
 *
 * @param mixed $params Parameters and path information or a CakeRequest object.
 * @return void
 */
	public static function setRequestInfo($request) {
		if ($request instanceof CakeRequest) {
			self::$_requests[] = $request;
		} else {
			$requestObj = new CakeRequest();
			$request += array(array(), array());
			$request[0] += array('controller' => false, 'action' => false, 'plugin' => null);
			$requestObj->addParams($request[0])->addPaths($request[1]);
			self::$_requests[] = $requestObj;
		}
	}

/**
 * Get the either the current request object, or the first one.
 *
 * @param boolean $current Whether you want the request from the top of the stack or the first one.
 * @return CakeRequest or null.
 */
	public static function getRequest($current = false) {
		if ($current) {
			return self::$_requests[count(self::$_requests) - 1];
		}
		return isset(self::$_requests[0]) ? self::$_requests[0] : null;
	}

/**
 * Gets parameter information
 *
 * @param boolean $current Get current request parameter, useful when using requestAction
 * @return array Parameter information
 */
	public static function getParams($current = false) {
		if ($current) {
			return self::$_requests[count(self::$_requests) - 1]->params;
		}
		if (isset(self::$_requests[0])) {
			return self::$_requests[0]->params;
		}
		return array();
	}

/**
 * Gets URL parameter by name
 *
 * @param string $name Parameter name
 * @param boolean $current Current parameter, useful when using requestAction
 * @return string Parameter value
 */
	public static function getParam($name = 'controller', $current = false) {
		$params = Router::getParams($current);
		if (isset($params[$name])) {
			return $params[$name];
		}
		return null;
	}

/**
 * Gets path information
 *
 * @param boolean $current Current parameter, useful when using requestAction
 * @return array
 */
	public static function getPaths($current = false) {
		if ($current) {
			return self::$_requests[count(self::$_requests) - 1];
		}
		if (!isset(self::$_requests[0])) {
			return array('base' => null);
		}
		return array('base' => self::$_requests[0]->base);
	}

/**
 * Reloads default Router settings.  Resets all class variables and 
 * removes all connected routes.
 *
 * @return void
 */
	public static function reload() {
		if (empty(self::$_initialState)) {
			self::$_initialState = get_class_vars('Router');
			return;
		}
		foreach (self::$_initialState as $key => $val) {
			if ($key != '_initialState') {
				self::${$key} = $val;
			}
		}
		self::_setPrefixes();
	}

/**
 * Promote a route (by default, the last one added) to the beginning of the list
 *
 * @param $which A zero-based array index representing the route to move. For example,
 *    if 3 routes have been added, the last route would be 2.
 * @return boolean Retuns false if no route exists at the position specified by $which.
 */
	public static function promote($which = null) {
		if ($which === null) {
			$which = count(self::$routes) - 1;
		}
		if (!isset(self::$routes[$which])) {
			return false;
		}
		$route =& self::$routes[$which];
		unset(self::$routes[$which]);
		array_unshift(self::$routes, $route);
		return true;
	}

/**
 * Finds URL for specified action.
 *
 * Returns an URL pointing to a combination of controller and action. Param
 * $url can be:
 *
 * - Empty - the method will find address to actuall controller/action.
 * - '/' - the method will find base URL of application.
 * - A combination of controller/action - the method will find url for it.
 *
 * There are a few 'special' parameters that can change the final URL string that is generated
 * 
 * - `base` - Set to false to remove the base path from the generated url. If your application
 *   is not in the root directory, this can be used to generate urls that are 'cake relative'.
 *   cake relative urls are required when using requestAction.
 * - `?` - Takes an array of query string parameters
 * - `#` - Allows you to set url hash fragments.
 * - `full_base` - If true the `FULL_BASE_URL` constant will be prepended to generated urls.
 *
 * @param mixed $url Cake-relative URL, like "/products/edit/92" or "/presidents/elect/4"
 *   or an array specifying any of the following: 'controller', 'action',
 *   and/or 'plugin', in addition to named arguments (keyed array elements),
 *   and standard URL arguments (indexed array elements)
 * @param mixed $full If (bool) true, the full base URL will be prepended to the result.
 *   If an array accepts the following keys
 *    - escape - used when making urls embedded in html escapes query string '&'
 *    - full - if true the full base URL will be prepended.
 * @return string Full translated URL with base path.
 */
	public static function url($url = null, $full = false) {
		$defaults = $params = array('plugin' => null, 'controller' => null, 'action' => 'index');

		if (is_bool($full)) {
			$escape = false;
		} else {
			extract($full + array('escape' => false, 'full' => false));
		}

		$path = array('base' => null);
		if (!empty(self::$_requests)) {
			$currentRequest = self::$_requests[count(self::$_requests) - 1];
			if (!empty($currentRequest->params['requested'])) {
				$request = self::$_requests[0];
			} else {
				$request = $currentRequest;
			}
			$params = $request->params;
			$path = array('base' => $request->base, 'here' => $request->here);
		}

		$base = $path['base'];
		$extension = $output = $mapped = $q = $frag = null;
		
		if (empty($url)) {
			$output = isset($path['here']) ? $path['here'] : '/';
			if ($full && defined('FULL_BASE_URL')) {
				$output = FULL_BASE_URL . $output;
			}
			return $output;
		} elseif (is_array($url)) {
			if (isset($url['base']) && $url['base'] === false) {
				$base = null;
				unset($url['base']);
			}
			if (isset($url['full_base']) && $url['full_base'] === true) {
				$full = true;
				unset($url['full_base']);
			}
			if (isset($url['?'])) {
				$q = $url['?'];
				unset($url['?']);
			}
			if (isset($url['#'])) {
				$frag = '#' . urlencode($url['#']);
				unset($url['#']);
			}
			if (isset($url['ext'])) {
				$extension = '.' . $url['ext'];
				unset($url['ext']);
			}
			if (empty($url['action'])) {
				if (empty($url['controller']) || $params['controller'] === $url['controller']) {
					$url['action'] = $params['action'];
				} else {
					$url['action'] = 'index';
				}
			}

			$prefixExists = (array_intersect_key($url, array_flip(self::$_prefixes)));
			foreach (self::$_prefixes as $prefix) {
				if (!empty($params[$prefix]) && !$prefixExists) {
					$url[$prefix] = true;
				} elseif (isset($url[$prefix]) && !$url[$prefix]) {
					unset($url[$prefix]);
				}
				if (isset($url[$prefix]) && strpos($url['action'], $prefix) === 0) {
					$url['action'] = substr($url['action'], strlen($prefix) + 1);
				}
			}

			$url += array('controller' => $params['controller'], 'plugin' => $params['plugin']);

			$match = false;

			for ($i = 0, $len = count(self::$routes); $i < $len; $i++) {
				$originalUrl = $url;

				if (isset(self::$routes[$i]->options['persist'], $params)) {
					$url = self::$routes[$i]->persistParams($url, $params);
				}

				if ($match = self::$routes[$i]->match($url)) {
					$output = trim($match, '/');
					break;
				}
				$url = $originalUrl;
			}
			if ($match === false) {
				$output = self::_handleNoRoute($url);
			}
		} else {
			if (
				(strpos($url, '://') || 
				(strpos($url, 'javascript:') === 0) || 
				(strpos($url, 'mailto:') === 0)) ||
				(!strncmp($url, '#', 1))
			) {
				return $url;
			}
			if (substr($url, 0, 1) === '/') {
				$output = substr($url, 1);
			} else {
				foreach (self::$_prefixes as $prefix) {
					if (isset($params[$prefix])) {
						$output .= $prefix . '/';
						break;
					}
				}
				if (!empty($params['plugin']) && $params['plugin'] !== $params['controller']) {
					$output .= Inflector::underscore($params['plugin']) . '/';
				}
				$output .= Inflector::underscore($params['controller']) . '/' . $url;
			}
		}
		$protocol = preg_match('#^[a-z][a-z0-9+-.]*\://#i', $output);
		if ($protocol === 0) {
			$output = str_replace('//', '/', $base . '/' . $output);

			if ($full && defined('FULL_BASE_URL')) {
				$output = FULL_BASE_URL . $output;
			}
			if (!empty($extension)) {
				$output = rtrim($output, '/');
			}
		}
		return $output . $extension . self::queryString($q, array(), $escape) . $frag;
	}

/**
 * A special fallback method that handles url arrays that cannot match
 * any defined routes.
 *
 * @param array $url A url that didn't match any routes
 * @return string A generated url for the array
 * @see Router::url()
 */
	protected static function _handleNoRoute($url) {
		$named = $args = $query = array();
		$skip = array_merge(
			array('bare', 'action', 'controller', 'plugin', 'prefix'),
			self::$_prefixes
		);

		$keys = array_values(array_diff(array_keys($url), $skip));
		$count = count($keys);

		// Remove this once parsed URL parameters can be inserted into 'pass'
		for ($i = 0; $i < $count; $i++) {
			$key = $keys[$i];
			if (is_numeric($keys[$i])) {
				$args[] = $url[$key];
			} else {
				$named[$key] = $url[$key];
			}
		}

		list($args, $named) = array(Set::filter($args, true), Set::filter($named, true));
		foreach (self::$_prefixes as $prefix) {
			if (!empty($url[$prefix])) {
				$url['action'] = str_replace($prefix . '_', '', $url['action']);
				break;
			}
		}

		if (empty($named) && empty($args) && empty($query) && (!isset($url['action']) || $url['action'] === 'index')) {
			$url['action'] = null;
		}

		$urlOut = array_filter(array($url['controller'], $url['action']));

		if (isset($url['plugin'])) {
			array_unshift($urlOut, $url['plugin']);
		}

		foreach (self::$_prefixes as $prefix) {
			if (isset($url[$prefix])) {
				array_unshift($urlOut, $prefix);
				break;
			}
		}
		$output = implode('/', $urlOut);

		if (!empty($args)) {
			$output .= '/' . implode('/', $args);
		}

		if (!empty($named)) {
			foreach ($named as $name => $value) {
				if (is_array($value)) {
					$flattend = Set::flatten($value, '][');
					foreach ($flattend as $namedKey => $namedValue) {
						$output .= '/' . $name . "[$namedKey]" . self::$named['separator'] . $namedValue;
					}
				} else {
					$output .= '/' . $name . self::$named['separator'] . $value;
				}
			}
		}
		if (!empty($query)) {
			$output .= Router::queryString($query);
		}
		return $output;
	}

/**
 * Takes an array of URL parameters and separates the ones that can be used as named arguments
 *
 * @param array $params Associative array of URL parameters.
 * @param string $controller Name of controller being routed.  Used in scoping.
 * @param string $action Name of action being routed.  Used in scoping.
 * @return array
 */
	public static function getNamedElements($params, $controller = null, $action = null) {
		$named = array();

		foreach ($params as $param => $val) {
			if (isset(self::$named['rules'][$param])) {
				$rule = self::$named['rules'][$param];
				if (Router::matchNamed($param, $val, $rule, compact('controller', 'action'))) {
					$named[substr($param, 1)] = $val;
					unset($params[$param]);
				}
			}
		}
		return array($named, $params);
	}

/**
 * Return true if a given named $param's $val matches a given $rule depending on $context. Currently implemented
 * rule types are controller, action and match that can be combined with each other.
 *
 * @param string $param The name of the named parameter
 * @param string $val The value of the named parameter
 * @param array $rule The rule(s) to apply, can also be a match string
 * @param string $context An array with additional context information (controller / action)
 * @return boolean
 */
	public static function matchNamed($param, $val, $rule, $context = array()) {
		if ($rule === true || $rule === false) {
			return $rule;
		}
		if (is_string($rule)) {
			$rule = array('match' => $rule);
		}
		if (!is_array($rule)) {
			return false;
		}

		$controllerMatches = !isset($rule['controller'], $context['controller']) || in_array($context['controller'], (array)$rule['controller']);
		if (!$controllerMatches) {
			return false;
		}
		$actionMatches = !isset($rule['action'], $context['action']) || in_array($context['action'], (array)$rule['action']);
		if (!$actionMatches) {
			return false;
		}
		return (!isset($rule['match']) || preg_match('/' . $rule['match'] . '/', $val));
	}

/**
 * Generates a well-formed querystring from $q
 *
 * @param mixed $q Query string Either a string of already compiled query string arguments or
 *    an array of arguments to convert into a query string.
 * @param array $extra Extra querystring parameters.
 * @param bool $escape Whether or not to use escaped &
 * @return array
 */
	public static function queryString($q, $extra = array(), $escape = false) {
		if (empty($q) && empty($extra)) {
			return null;
		}
		$join = '&';
		if ($escape === true) {
			$join = '&amp;';
		}
		$out = '';

		if (is_array($q)) {
			$q = array_merge($extra, $q);
		} else {
			$out = $q;
			$q = $extra;
		}
		$out .= http_build_query($q, null, $join);
		if (isset($out[0]) && $out[0] != '?') {
			$out = '?' . $out;
		}
		return $out;
	}

/**
 * Reverses a parsed parameter array into a string. Works similarily to Router::url(), but
 * Since parsed URL's contain additional 'pass' and 'named' as well as 'url.url' keys.
 * Those keys need to be specially handled in order to reverse a params array into a string url.
 *
 * This will strip out 'autoRender', 'bare', 'requested', and 'return' param names as those
 * are used for CakePHP internals and should not normally be part of an output url.
 *
 * @param mixed $param The params array or CakeRequest object that needs to be reversed.
 * @return string The string that is the reversed result of the array
 */
	public static function reverse($params) {
		if ($params instanceof CakeRequest) {
			$params = $params->params;
		}
		$pass = $params['pass'];
		$named = $params['named'];
		$url = $params['url'];
		unset(
			$params['pass'], $params['named'], $params['paging'], $params['models'], $params['url'], $url['url'],
			$params['autoRender'], $params['bare'], $params['requested'], $params['return']
		);
		$params = array_merge($params, $pass, $named);
		if (!empty($url)) {
			$params['?'] = $url;
		}
		return Router::url($params);
	}

/**
 * Normalizes a URL for purposes of comparison.  Will strip the base path off
 * and replace any double /'s.  It will not unify the casing and underscoring
 * of the input value.
 *
 * @param mixed $url URL to normalize Either an array or a string url.
 * @return string Normalized URL
 */
	public static function normalize($url = '/') {
		if (is_array($url)) {
			$url = Router::url($url);
		} elseif (preg_match('/^[a-z\-]+:\/\//', $url)) {
			return $url;
		}
		$request = Router::getRequest();

		if (!empty($request->base) && stristr($url, $request->base)) {
			$url = preg_replace('/^' . preg_quote($request->base, '/') . '/', '', $url, 1);
		}
		$url = '/' . $url;

		while (strpos($url, '//') !== false) {
			$url = str_replace('//', '/', $url);
		}
		$url = preg_replace('/(?:(\/$))/', '', $url);

		if (empty($url)) {
			return '/';
		}
		return $url;
	}

/**
 * Returns the route matching the current request URL.
 *
 * @return CakeRoute Matching route object.
 */
	public static function &requestRoute() {
		return self::$_currentRoute[0];
	}

/**
 * Returns the route matching the current request (useful for requestAction traces)
 *
 * @return CakeRoute Matching route object.
 */
	public static function &currentRoute() {
		return self::$_currentRoute[count(self::$_currentRoute) - 1];
	}

/**
 * Removes the plugin name from the base URL.
 *
 * @param string $base Base URL
 * @param string $plugin Plugin name
 * @return base url with plugin name removed if present
 */
	public static function stripPlugin($base, $plugin = null) {
		if ($plugin != null) {
			$base = preg_replace('/(?:' . $plugin . ')/', '', $base);
			$base = str_replace('//', '', $base);
			$pos1 = strrpos($base, '/');
			$char = strlen($base) - 1;

			if ($pos1 === $char) {
				$base = substr($base, 0, $char);
			}
		}
		return $base;
	}

/**
 * Instructs the router to parse out file extensions from the URL. For example,
 * http://example.com/posts.rss would yield an file extension of "rss".
 * The file extension itself is made available in the controller as
 * $this->params['url']['ext'], and is used by the RequestHandler component to
 * automatically switch to alternate layouts and templates, and load helpers
 * corresponding to the given content, i.e. RssHelper.
 *
 * A list of valid extension can be passed to this method, i.e. Router::parseExtensions('rss', 'xml');
 * If no parameters are given, anything after the first . (dot) after the last / in the URL will be
 * parsed, excluding querystring parameters (i.e. ?q=...).
 *
 * @return void
 */
	public static function parseExtensions() {
		self::$_parseExtensions = true;
		if (func_num_args() > 0) {
			self::$_validExtensions = func_get_args();
		}
	}

/**
 * Get the list of extensions that can be parsed by Router.  To add more
 * extensions use Router::parseExtensions()
 *
 * @return array Array of extensions Router is configured to parse.
 */
	public static function extensions() {
		return self::$_validExtensions;
	}

/**
 * Takes an passed params and converts it to args
 *
 * @param array $params
 * @return array Array containing passed and named parameters
 */
	public static function getArgs($args, $options = array()) {
		$pass = $named = array();
		$args = explode('/', $args);

		$greedy = isset($options['greedy']) ? $options['greedy'] : self::$named['greedy'];
		$context = array();
		if (isset($options['context'])) {
			$context = $options['context'];
		}
		$rules = self::$named['rules'];
		if (isset($options['named'])) {
			$greedy = isset($options['greedy']) && $options['greedy'] === true;
			foreach ((array)$options['named'] as $key => $val) {
				if (is_numeric($key)) {
					$rules[$val] = true;
					continue;
				}
				$rules[$key] = $val;
			}
		}

		foreach ($args as $param) {
			if (empty($param) && $param !== '0' && $param !== 0) {
				continue;
			}

			$separatorIsPresent = strpos($param, self::$named['separator']) !== false;
			if ((!isset($options['named']) || !empty($options['named'])) && $separatorIsPresent) {
				list($key, $val) = explode(self::$named['separator'], $param, 2);
				$hasRule = isset($rules[$key]);
				$passIt = (!$hasRule && !$greedy) || ($hasRule && !self::matchNamed($key, $val, $rules[$key], $context));
				if ($passIt) {
					$pass[] = $param;
				} else {
					if (preg_match_all('/\[([A-Za-z0-9_-]+)?\]/', $key, $matches, PREG_SET_ORDER)) {
						$matches = array_reverse($matches);
						$parts = explode('[', $key);
						$key = array_shift($parts);
						$arr = $val;
						foreach ($matches as $match) {
							if (empty($match[1])) {
								$arr = array($arr);
							} else {
								$arr = array(
									$match[1] => $arr
								);
							}
						}
						$val = $arr;
					}
					$named = array_merge_recursive($named, array($key => $val));
				}
			} else {
				$pass[] = $param;
			}
		}
		return compact('pass', 'named');
	}
}
//Save the initial state
Router::reload();