<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 5.1.6 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */



// ------------------------------------------------------------------------



/**

 * Loader Class

 *

 * Loads views and files

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @author		ExpressionEngine Dev Team

 * @category	Loader

 * @link		http://codeigniter.com/user_guide/libraries/loader.html

 */

class CI_Loader {



	// All these are set automatically. Don't mess with them.

	/**

	 * Nesting level of the output buffering mechanism

	 *

	 * @var int

	 * @access protected

	 */

	protected $_ci_ob_level;

	/**

	 * List of paths to load views from

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_view_paths		= array();

	/**

	 * List of paths to load libraries from

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_library_paths	= array();

	/**

	 * List of paths to load models from

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_model_paths		= array();

	/**

	 * List of paths to load helpers from

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_helper_paths		= array();

	/**

	 * List of loaded base classes

	 * Set by the controller class

	 *

	 * @var array

	 * @access protected

	 */

	protected $_base_classes		= array(); // Set by the controller class

	/**

	 * List of cached variables

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_cached_vars		= array();

	/**

	 * List of loaded classes

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_classes			= array();

	/**

	 * List of loaded files

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_loaded_files		= array();

	/**

	 * List of loaded models

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_models			= array();

	/**

	 * List of loaded helpers

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_helpers			= array();

	/**

	 * List of class name mappings

	 *

	 * @var array

	 * @access protected

	 */

	protected $_ci_varmap			= array('unit_test' => 'unit',

											'user_agent' => 'agent');



	/**

	 * Constructor

	 *

	 * Sets the path to the view files and gets the initial output buffering level

	 */

	public function __construct()

	{

		$this->_ci_ob_level  = ob_get_level();

		$this->_ci_library_paths = array(APPPATH, BASEPATH);

		$this->_ci_helper_paths = array(APPPATH, BASEPATH);

		$this->_ci_model_paths = array(APPPATH);

		$this->_ci_view_paths = array(APPPATH.'views/'	=> TRUE);



		log_message('debug', "Loader Class Initialized");

	}



	// --------------------------------------------------------------------



	/**

	 * Initialize the Loader

	 *

	 * This method is called once in CI_Controller.

	 *

	 * @param 	array

	 * @return 	object

	 */

	public function initialize()

	{

		$this->_ci_classes = array();

		$this->_ci_loaded_files = array();

		$this->_ci_models = array();

		$this->_base_classes =& is_loaded();



		$this->_ci_autoloader();



		return $this;

	}



	// --------------------------------------------------------------------



	/**

	 * Is Loaded

	 *

	 * A utility function to test if a class is in the self::$_ci_classes array.

	 * This function returns the object name if the class tested for is loaded,

	 * and returns FALSE if it isn't.

	 *

	 * It is mainly used in the form_helper -> _get_validation_object()

	 *

	 * @param 	string	class being checked for

	 * @return 	mixed	class object name on the CI SuperObject or FALSE

	 */

	public function is_loaded($class)

	{

		if (isset($this->_ci_classes[$class]))

		{

			return $this->_ci_classes[$class];

		}



		return FALSE;

	}



	// --------------------------------------------------------------------



	/**

	 * Class Loader

	 *

	 * This function lets users load and instantiate classes.

	 * It is designed to be called from a user's app controllers.

	 *

	 * @param	string	the name of the class

	 * @param	mixed	the optional parameters

	 * @param	string	an optional object name

	 * @return	void

	 */

	public function library($library = '', $params = NULL, $object_name = NULL)

	{

		if (is_array($library))

		{

			foreach ($library as $class)

			{

				$this->library($class, $params);

			}



			return;

		}



		if ($library == '' OR isset($this->_base_classes[$library]))

		{

			return FALSE;

		}



		if ( ! is_null($params) && ! is_array($params))

		{

			$params = NULL;

		}



		$this->_ci_load_class($library, $params, $object_name);

	}



	// --------------------------------------------------------------------



	/**

	 * Model Loader

	 *

	 * This function lets users load and instantiate models.

	 *

	 * @param	string	the name of the class

	 * @param	string	name for the model

	 * @param	bool	database connection

	 * @return	void

	 */

	public function model($model, $name = '', $db_conn = FALSE)

	{

		if (is_array($model))

		{

			foreach ($model as $babe)

			{

				$this->model($babe);

			}

			return;

		}



		if ($model == '')

		{

			return;

		}



		$path = '';



		// Is the model in a sub-folder? If so, parse out the filename and path.

		if (($last_slash = strrpos($model, '/')) !== FALSE)

		{

			// The path is in front of the last slash

			$path = substr($model, 0, $last_slash + 1);



			// And the model name behind it

			$model = substr($model, $last_slash + 1);

		}



		if ($name == '')

		{

			$name = $model;

		}



		if (in_array($name, $this->_ci_models, TRUE))

		{

			return;

		}



		$CI =& get_instance();

		if (isset($CI->$name))

		{

			show_error('The model name you are loading is the name of a resource that is already being used: '.$name);

		}



		$model = strtolower($model);



		foreach ($this->_ci_model_paths as $mod_path)

		{

			if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))

			{

				continue;

			}



			if ($db_conn !== FALSE AND ! class_exists('CI_DB'))

			{

				if ($db_conn === TRUE)

				{

					$db_conn = '';

				}



				$CI->load->database($db_conn, FALSE, TRUE);

			}



			if ( ! class_exists('CI_Model'))

			{

				load_class('Model', 'core');

			}



			require_once($mod_path.'models/'.$path.$model.'.php');



			$model = ucfirst($model);



			$CI->$name = new $model();



			$this->_ci_models[] = $name;

			return;

		}



		// couldn't find the model

		show_error('Unable to locate the model you have specified: '.$model);

	}



	// --------------------------------------------------------------------



	/**

	 * Database Loader

	 *

	 * @param	string	the DB credentials

	 * @param	bool	whether to return the DB object

	 * @param	bool	whether to enable active record (this allows us to override the config setting)

	 * @return	object

	 */

	public function database($params = '', $return = FALSE, $active_record = NULL)

	{

		// Grab the super object

		$CI =& get_instance();



		// Do we even need to load the database class?

		if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db))

		{

			return FALSE;

		}



		require_once(BASEPATH.'database/DB.php');



		if ($return === TRUE)

		{

			return DB($params, $active_record);

		}



		// Initialize the db variable.  Needed to prevent

		// reference errors with some configurations

		$CI->db = '';



		// Load the DB class

		$CI->db =& DB($params, $active_record);

	}



	// --------------------------------------------------------------------



	/**

	 * Load the Utilities Class

	 *

	 * @return	string

	 */

	public function dbutil()

	{

		if ( ! class_exists('CI_DB'))

		{

			$this->database();

		}



		$CI =& get_instance();



		// for backwards compatibility, load dbforge so we can extend dbutils off it

		// this use is deprecated and strongly discouraged

		$CI->load->dbforge();



		require_once(BASEPATH.'database/DB_utility.php');

		require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_utility.php');

		$class = 'CI_DB_'.$CI->db->dbdriver.'_utility';



		$CI->dbutil = new $class();

	}



	// --------------------------------------------------------------------



	/**

	 * Load the Database Forge Class

	 *

	 * @return	string

	 */

	public function dbforge()

	{

		if ( ! class_exists('CI_DB'))

		{

			$this->database();

		}



		$CI =& get_instance();



		require_once(BASEPATH.'database/DB_forge.php');

		require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_forge.php');

		$class = 'CI_DB_'.$CI->db->dbdriver.'_forge';



		$CI->dbforge = new $class();

	}



	// --------------------------------------------------------------------



	/**

	 * Load View

	 *

	 * This function is used to load a "view" file.  It has three parameters:

	 *

	 * 1. The name of the "view" file to be included.

	 * 2. An associative array of data to be extracted for use in the view.

	 * 3. TRUE/FALSE - whether to return the data or load it.  In

	 * some cases it's advantageous to be able to return data so that

	 * a developer can process it in some way.

	 *

	 * @param	string

	 * @param	array

	 * @param	bool

	 * @return	void

	 */

	public function view($view, $vars = array(), $return = FALSE)

	{

		return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));

	}



	// --------------------------------------------------------------------



	/**

	 * Load File

	 *

	 * This is a generic file loader

	 *

	 * @param	string

	 * @param	bool

	 * @return	string

	 */

	public function file($path, $return = FALSE)

	{

		return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return));

	}



	// --------------------------------------------------------------------



	/**

	 * Set Variables

	 *

	 * Once variables are set they become available within

	 * the controller class and its "view" files.

	 *

	 * @param	array

	 * @param 	string

	 * @return	void

	 */

	public function vars($vars = array(), $val = '')

	{

		if ($val != '' AND is_string($vars))

		{

			$vars = array($vars => $val);

		}



		$vars = $this->_ci_object_to_array($vars);



		if (is_array($vars) AND count($vars) > 0)

		{

			foreach ($vars as $key => $val)

			{

				$this->_ci_cached_vars[$key] = $val;

			}

		}

	}



	// --------------------------------------------------------------------



	/**

	 * Get Variable

	 *

	 * Check if a variable is set and retrieve it.

	 *

	 * @param	array

	 * @return	void

	 */

	public function get_var($key)

	{

		return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;

	}



	// --------------------------------------------------------------------



	/**

	 * Load Helper

	 *

	 * This function loads the specified helper file.

	 *

	 * @param	mixed

	 * @return	void

	 */

	public function helper($helpers = array())

	{

		foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper)

		{

			if (isset($this->_ci_helpers[$helper]))

			{

				continue;

			}



			$ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.'.php';



			// Is this a helper extension request?

			if (file_exists($ext_helper))

			{

				$base_helper = BASEPATH.'helpers/'.$helper.'.php';



				if ( ! file_exists($base_helper))

				{

					show_error('Unable to load the requested file: helpers/'.$helper.'.php');

				}



				include_once($ext_helper);

				include_once($base_helper);



				$this->_ci_helpers[$helper] = TRUE;

				log_message('debug', 'Helper loaded: '.$helper);

				continue;

			}



			// Try to load the helper

			foreach ($this->_ci_helper_paths as $path)

			{

				if (file_exists($path.'helpers/'.$helper.'.php'))

				{

					include_once($path.'helpers/'.$helper.'.php');



					$this->_ci_helpers[$helper] = TRUE;

					log_message('debug', 'Helper loaded: '.$helper);

					break;

				}

			}



			// unable to load the helper

			if ( ! isset($this->_ci_helpers[$helper]))

			{

				show_error('Unable to load the requested file: helpers/'.$helper.'.php');

			}

		}

	}



	// --------------------------------------------------------------------



	/**

	 * Load Helpers

	 *

	 * This is simply an alias to the above function in case the

	 * user has written the plural form of this function.

	 *

	 * @param	array

	 * @return	void

	 */

	public function helpers($helpers = array())

	{

		$this->helper($helpers);

	}



	// --------------------------------------------------------------------



	/**

	 * Loads a language file

	 *

	 * @param	array

	 * @param	string

	 * @return	void

	 */

	public function language($file = array(), $lang = '')

	{

		$CI =& get_instance();



		if ( ! is_array($file))

		{

			$file = array($file);

		}



		foreach ($file as $langfile)

		{

			$CI->lang->load($langfile, $lang);

		}

	}



	// --------------------------------------------------------------------



	/**

	 * Loads a config file

	 *

	 * @param	string

	 * @param	bool

	 * @param 	bool

	 * @return	void

	 */

	public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)

	{

		$CI =& get_instance();

		$CI->config->load($file, $use_sections, $fail_gracefully);

	}



	// --------------------------------------------------------------------



	/**

	 * Driver

	 *

	 * Loads a driver library

	 *

	 * @param	string	the name of the class

	 * @param	mixed	the optional parameters

	 * @param	string	an optional object name

	 * @return	void

	 */

	public function driver($library = '', $params = NULL, $object_name = NULL)

	{

		if ( ! class_exists('CI_Driver_Library'))

		{

			// we aren't instantiating an object here, that'll be done by the Library itself

			require BASEPATH.'libraries/Driver.php';

		}



		if ($library == '')

		{

			return FALSE;

		}



		// We can save the loader some time since Drivers will *always* be in a subfolder,

		// and typically identically named to the library

		if ( ! strpos($library, '/'))

		{

			$library = ucfirst($library).'/'.$library;

		}



		return $this->library($library, $params, $object_name);

	}



	// --------------------------------------------------------------------



	/**

	 * Add Package Path

	 *

	 * Prepends a parent path to the library, model, helper, and config path arrays

	 *

	 * @param	string

	 * @param 	boolean

	 * @return	void

	 */

	public function add_package_path($path, $view_cascade=TRUE)

	{

		$path = rtrim($path, '/').'/';



		array_unshift($this->_ci_library_paths, $path);

		array_unshift($this->_ci_model_paths, $path);

		array_unshift($this->_ci_helper_paths, $path);



		$this->_ci_view_paths = array($path.'views/' => $view_cascade) + $this->_ci_view_paths;



		// Add config file path

		$config =& $this->_ci_get_component('config');

		array_unshift($config->_config_paths, $path);

	}



	// --------------------------------------------------------------------



	/**

	 * Get Package Paths

	 *

	 * Return a list of all package paths, by default it will ignore BASEPATH.

	 *

	 * @param	string

	 * @return	void

	 */

	public function get_package_paths($include_base = FALSE)

	{

		return $include_base === TRUE ? $this->_ci_library_paths : $this->_ci_model_paths;

	}



	// --------------------------------------------------------------------



	/**

	 * Remove Package Path

	 *

	 * Remove a path from the library, model, and helper path arrays if it exists

	 * If no path is provided, the most recently added path is removed.

	 *

	 * @param	type

	 * @param 	bool

	 * @return	type

	 */

	public function remove_package_path($path = '', $remove_config_path = TRUE)

	{

		$config =& $this->_ci_get_component('config');



		if ($path == '')

		{

			$void = array_shift($this->_ci_library_paths);

			$void = array_shift($this->_ci_model_paths);

			$void = array_shift($this->_ci_helper_paths);

			$void = array_shift($this->_ci_view_paths);

			$void = array_shift($config->_config_paths);

		}

		else

		{

			$path = rtrim($path, '/').'/';

			foreach (array('_ci_library_paths', '_ci_model_paths', '_ci_helper_paths') as $var)

			{

				if (($key = array_search($path, $this->{$var})) !== FALSE)

				{

					unset($this->{$var}[$key]);

				}

			}



			if (isset($this->_ci_view_paths[$path.'views/']))

			{

				unset($this->_ci_view_paths[$path.'views/']);

			}



			if (($key = array_search($path, $config->_config_paths)) !== FALSE)

			{

				unset($config->_config_paths[$key]);

			}

		}



		// make sure the application default paths are still in the array

		$this->_ci_library_paths = array_unique(array_merge($this->_ci_library_paths, array(APPPATH, BASEPATH)));

		$this->_ci_helper_paths = array_unique(array_merge($this->_ci_helper_paths, array(APPPATH, BASEPATH)));

		$this->_ci_model_paths = array_unique(array_merge($this->_ci_model_paths, array(APPPATH)));

		$this->_ci_view_paths = array_merge($this->_ci_view_paths, array(APPPATH.'views/' => TRUE));

		$config->_config_paths = array_unique(array_merge($config->_config_paths, array(APPPATH)));

	}



	// --------------------------------------------------------------------



	/**

	 * Loader

	 *

	 * This function is used to load views and files.

	 * Variables are prefixed with _ci_ to avoid symbol collision with

	 * variables made available to view files

	 *

	 * @param	array

	 * @return	void

	 */

	protected function _ci_load($_ci_data)

	{

		// Set the default data variables

		foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val)

		{

			$$_ci_val = ( ! isset($_ci_data[$_ci_val])) ? FALSE : $_ci_data[$_ci_val];

		}



		$file_exists = FALSE;



		// Set the path to the requested file

		if ($_ci_path != '')

		{

			$_ci_x = explode('/', $_ci_path);

			$_ci_file = end($_ci_x);

		}

		else

		{

			$_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);

			$_ci_file = ($_ci_ext == '') ? $_ci_view.'.php' : $_ci_view;



			foreach ($this->_ci_view_paths as $view_file => $cascade)

			{

				if (file_exists($view_file.$_ci_file))

				{

					$_ci_path = $view_file.$_ci_file;

					$file_exists = TRUE;

					break;

				}



				if ( ! $cascade)

				{

					break;

				}

			}

		}



		if ( ! $file_exists && ! file_exists($_ci_path))

		{

			show_error('Unable to load the requested file: '.$_ci_file);

		}



		// This allows anything loaded using $this->load (views, files, etc.)

		// to become accessible from within the Controller and Model functions.



		$_ci_CI =& get_instance();

		foreach (get_object_vars($_ci_CI) as $_ci_key => $_ci_var)

		{

			if ( ! isset($this->$_ci_key))

			{

				$this->$_ci_key =& $_ci_CI->$_ci_key;

			}

		}



		/*

		 * Extract and cache variables

		 *

		 * You can either set variables using the dedicated $this->load_vars()

		 * function or via the second parameter of this function. We'll merge

		 * the two types and cache them so that views that are embedded within

		 * other views can have access to these variables.

		 */

		if (is_array($_ci_vars))

		{

			$this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);

		}

		extract($this->_ci_cached_vars);



		/*

		 * Buffer the output

		 *

		 * We buffer the output for two reasons:

		 * 1. Speed. You get a significant speed boost.

		 * 2. So that the final rendered template can be

		 * post-processed by the output class.  Why do we

		 * need post processing?  For one thing, in order to

		 * show the elapsed page load time.  Unless we

		 * can intercept the content right before it's sent to

		 * the browser and then stop the timer it won't be accurate.

		 */

		ob_start();



		// If the PHP installation does not support short tags we'll

		// do a little string replacement, changing the short tags

		// to standard PHP echo statements.



		if ((bool) @ini_get('short_open_tag') === FALSE AND config_item('rewrite_short_tags') == TRUE)

		{

			echo eval('?>'.preg_replace("/;*\s*\?>/", "; ?>", str_replace('<?=', '<?php echo ', file_get_contents($_ci_path))));

		}

		else

		{

			include($_ci_path); // include() vs include_once() allows for multiple views with the same name

		}



		log_message('debug', 'File loaded: '.$_ci_path);



		// Return the file data if requested

		if ($_ci_return === TRUE)

		{

			$buffer = ob_get_contents();

			@ob_end_clean();

			return $buffer;

		}



		/*

		 * Flush the buffer... or buff the flusher?

		 *

		 * In order to permit views to be nested within

		 * other views, we need to flush the content back out whenever

		 * we are beyond the first level of output buffering so that

		 * it can be seen and included properly by the first included

		 * template and any subsequent ones. Oy!

		 *

		 */

		if (ob_get_level() > $this->_ci_ob_level + 1)

		{

			ob_end_flush();

		}

		else

		{

			$_ci_CI->output->append_output(ob_get_contents());

			@ob_end_clean();

		}

	}



	// --------------------------------------------------------------------



	/**

	 * Load class

	 *

	 * This function loads the requested class.

	 *

	 * @param	string	the item that is being loaded

	 * @param	mixed	any additional parameters

	 * @param	string	an optional object name

	 * @return	void

	 */

	protected function _ci_load_class($class, $params = NULL, $object_name = NULL)

	{

		// Get the class name, and while we're at it trim any slashes.

		// The directory path can be included as part of the class name,

		// but we don't want a leading slash

		$class = str_replace('.php', '', trim($class, '/'));



		// Was the path included with the class name?

		// We look for a slash to determine this

		$subdir = '';

		if (($last_slash = strrpos($class, '/')) !== FALSE)

		{

			// Extract the path

			$subdir = substr($class, 0, $last_slash + 1);



			// Get the filename from the path

			$class = substr($class, $last_slash + 1);

		}



		// We'll test for both lowercase and capitalized versions of the file name

		foreach (array(ucfirst($class), strtolower($class)) as $class)

		{

			$subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.'.php';



			// Is this a class extension request?

			if (file_exists($subclass))

			{

				$baseclass = BASEPATH.'libraries/'.ucfirst($class).'.php';



				if ( ! file_exists($baseclass))

				{

					log_message('error', "Unable to load the requested class: ".$class);

					show_error("Unable to load the requested class: ".$class);

				}



				// Safety:  Was the class already loaded by a previous call?

				if (in_array($subclass, $this->_ci_loaded_files))

				{

					// Before we deem this to be a duplicate request, let's see

					// if a custom object name is being supplied.  If so, we'll

					// return a new instance of the object

					if ( ! is_null($object_name))

					{

						$CI =& get_instance();

						if ( ! isset($CI->$object_name))

						{

							return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);

						}

					}



					$is_duplicate = TRUE;

					log_message('debug', $class." class already loaded. Second attempt ignored.");

					return;

				}



				include_once($baseclass);

				include_once($subclass);

				$this->_ci_loaded_files[] = $subclass;



				return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);

			}



			// Lets search for the requested library file and load it.

			$is_duplicate = FALSE;

			foreach ($this->_ci_library_paths as $path)

			{

				$filepath = $path.'libraries/'.$subdir.$class.'.php';



				// Does the file exist?  No?  Bummer...

				if ( ! file_exists($filepath))

				{

					continue;

				}



				// Safety:  Was the class already loaded by a previous call?

				if (in_array($filepath, $this->_ci_loaded_files))

				{

					// Before we deem this to be a duplicate request, let's see

					// if a custom object name is being supplied.  If so, we'll

					// return a new instance of the object

					if ( ! is_null($object_name))

					{

						$CI =& get_instance();

						if ( ! isset($CI->$object_name))

						{

							return $this->_ci_init_class($class, '', $params, $object_name);

						}

					}



					$is_duplicate = TRUE;

					log_message('debug', $class." class already loaded. Second attempt ignored.");

					return;

				}



				include_once($filepath);

				$this->_ci_loaded_files[] = $filepath;

				return $this->_ci_init_class($class, '', $params, $object_name);

			}



		} // END FOREACH



		// One last attempt.  Maybe the library is in a subdirectory, but it wasn't specified?

		if ($subdir == '')

		{

			$path = strtolower($class).'/'.$class;

			return $this->_ci_load_class($path, $params);

		}



		// If we got this far we were unable to find the requested class.

		// We do not issue errors if the load call failed due to a duplicate request

		if ($is_duplicate == FALSE)

		{

			log_message('error', "Unable to load the requested class: ".$class);

			show_error("Unable to load the requested class: ".$class);

		}

	}



	// --------------------------------------------------------------------



	/**

	 * Instantiates a class

	 *

	 * @param	string

	 * @param	string

	 * @param	bool

	 * @param	string	an optional object name

	 * @return	null

	 */

	protected function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL)

	{

		// Is there an associated config file for this class?  Note: these should always be lowercase

		if ($config === NULL)

		{

			// Fetch the config paths containing any package paths

			$config_component = $this->_ci_get_component('config');



			if (is_array($config_component->_config_paths))

			{

				// Break on the first found file, thus package files

				// are not overridden by default paths

				foreach ($config_component->_config_paths as $path)

				{

					// We test for both uppercase and lowercase, for servers that

					// are case-sensitive with regard to file names. Check for environment

					// first, global next

					if (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php'))

					{

						include($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php');

						break;

					}

					elseif (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php'))

					{

						include($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php');

						break;

					}

					elseif (file_exists($path .'config/'.strtolower($class).'.php'))

					{

						include($path .'config/'.strtolower($class).'.php');

						break;

					}

					elseif (file_exists($path .'config/'.ucfirst(strtolower($class)).'.php'))

					{

						include($path .'config/'.ucfirst(strtolower($class)).'.php');

						break;

					}

				}

			}

		}



		if ($prefix == '')

		{

			if (class_exists('CI_'.$class))

			{

				$name = 'CI_'.$class;

			}

			elseif (class_exists(config_item('subclass_prefix').$class))

			{

				$name = config_item('subclass_prefix').$class;

			}

			else

			{

				$name = $class;

			}

		}

		else

		{

			$name = $prefix.$class;

		}



		// Is the class name valid?

		if ( ! class_exists($name))

		{

			log_message('error', "Non-existent class: ".$name);

			show_error("Non-existent class: ".$class);

		}



		// Set the variable name we will assign the class to

		// Was a custom class name supplied?  If so we'll use it

		$class = strtolower($class);



		if (is_null($object_name))

		{

			$classvar = ( ! isset($this->_ci_varmap[$class])) ? $class : $this->_ci_varmap[$class];

		}

		else

		{

			$classvar = $object_name;

		}



		// Save the class name and object name

		$this->_ci_classes[$class] = $classvar;



		// Instantiate the class

		$CI =& get_instance();

		if ($config !== NULL)

		{

			$CI->$classvar = new $name($config);

		}

		else

		{

			$CI->$classvar = new $name;

		}

	}



	// --------------------------------------------------------------------



	/**

	 * Autoloader

	 *

	 * The config/autoload.php file contains an array that permits sub-systems,

	 * libraries, and helpers to be loaded automatically.

	 *

	 * @param	array

	 * @return	void

	 */

	private function _ci_autoloader()

	{

		if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))

		{

			include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');

		}

		else

		{

			include(APPPATH.'config/autoload.php');

		}



		if ( ! isset($autoload))

		{

			return FALSE;

		}



		// Autoload packages

		if (isset($autoload['packages']))

		{

			foreach ($autoload['packages'] as $package_path)

			{

				$this->add_package_path($package_path);

			}

		}



		// Load any custom config file

		if (count($autoload['config']) > 0)

		{

			$CI =& get_instance();

			foreach ($autoload['config'] as $key => $val)

			{

				$CI->config->load($val);

			}

		}



		// Autoload helpers and languages

		foreach (array('helper', 'language') as $type)

		{

			if (isset($autoload[$type]) AND count($autoload[$type]) > 0)

			{

				$this->$type($autoload[$type]);

			}

		}



		// A little tweak to remain backward compatible

		// The $autoload['core'] item was deprecated

		if ( ! isset($autoload['libraries']) AND isset($autoload['core']))

		{

			$autoload['libraries'] = $autoload['core'];

		}



		// Load libraries

		if (isset($autoload['libraries']) AND count($autoload['libraries']) > 0)

		{

			// Load the database driver.

			if (in_array('database', $autoload['libraries']))

			{

				$this->database();

				$autoload['libraries'] = array_diff($autoload['libraries'], array('database'));

			}



			// Load all other libraries

			foreach ($autoload['libraries'] as $item)

			{

				$this->library($item);

			}

		}



		// Autoload models

		if (isset($autoload['model']))

		{

			$this->model($autoload['model']);

		}

	}



	// --------------------------------------------------------------------



	/**

	 * Object to Array

	 *

	 * Takes an object as input and converts the class variables to array key/vals

	 *

	 * @param	object

	 * @return	array

	 */

	protected function _ci_object_to_array($object)

	{

		return (is_object($object)) ? get_object_vars($object) : $object;

	}



	// --------------------------------------------------------------------



	/**

	 * Get a reference to a specific library or model

	 *

	 * @param 	string

	 * @return	bool

	 */

	protected function &_ci_get_component($component)

	{

		$CI =& get_instance();

		return $CI->$component;

	}



	// --------------------------------------------------------------------



	/**

	 * Prep filename

	 *

	 * This function preps the name of various items to make loading them more reliable.

	 *

	 * @param	mixed

	 * @param 	string

	 * @return	array

	 */

	protected function _ci_prep_filename($filename, $extension)

	{

		if ( ! is_array($filename))

		{

			return array(strtolower(str_replace('.php', '', str_replace($extension, '', $filename)).$extension));

		}

		else

		{

			foreach ($filename as $key => $val)

			{

				$filename[$key] = strtolower(str_replace('.php', '', str_replace($extension, '', $val)).$extension);

			}



			return $filename;

		}

	}

}



/* End of file Loader.php */

/* Location: ./system/core/Loader.php */