Loader.php

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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package             CodeIgniter
 * @author              ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008, 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.
        var $_ci_ob_level;
        var $_ci_view_path              = '';
        var $_ci_is_php5                = FALSE;
        var $_ci_is_instance    = FALSE; // Whether we should use $this or $CI =& get_instance()
        var $_ci_cached_vars    = array();
        var $_ci_classes                = array();
        var $_ci_loaded_files   = array();
        var $_ci_models                 = array();
        var $_ci_helpers                = array();
        var $_ci_plugins                = array();
        var $_ci_varmap                 = array('unit_test' => 'unit', 'user_agent' => 'agent');
        

        /**
         * Constructor
         *
         * Sets the path to the view files and gets the initial output buffering level
         *
         * @access      public
         */
        function CI_Loader()
        {       
                $this->_ci_is_php5 = (floor(phpversion()) >= 5) ? TRUE : FALSE;
                $this->_ci_view_path = APPPATH.'views/';
                $this->_ci_ob_level  = ob_get_level();
                                
                log_message('debug', "Loader Class Initialized");
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Class Loader
         *
         * This function lets users load and instantiate classes.
         * It is designed to be called from a user's app controllers.
         *
         * @access      public
         * @param       string  the name of the class
         * @param       mixed   the optional parameters
         * @param       string  an optional object name
         * @return      void
         */     
        function library($library = '', $params = NULL, $object_name = NULL)
        {
                if ($library == '')
                {
                        return FALSE;
                }

                if ( ! is_null($params) AND ! is_array($params))
                {
                        $params = NULL;
                }

                if (is_array($library))
                {
                        foreach ($library as $class)
                        {
                                $this->_ci_load_class($class, $params, $object_name);
                        }
                }
                else
                {
                        $this->_ci_load_class($library, $params, $object_name);
                }
                
                $this->_ci_assign_to_models();
        }

        // --------------------------------------------------------------------
        
        /**
         * Model Loader
         *
         * This function lets users load and instantiate models.
         *
         * @access      public
         * @param       string  the name of the class
         * @param       string  name for the model
         * @param       bool    database connection
         * @return      void
         */     
        function model($model, $name = '', $db_conn = FALSE)
        {               
                if (is_array($model))
                {
                        foreach($model as $babe)
                        {
                                $this->model($babe);    
                        }
                        return;
                }

                if ($model == '')
                {
                        return;
                }
        
                // Is the model in a sub-folder? If so, parse out the filename and path.
                if (strpos($model, '/') === FALSE)
                {
                        $path = '';
                }
                else
                {
                        $x = explode('/', $model);
                        $model = end($x);                       
                        unset($x[count($x)-1]);
                        $path = implode('/', $x).'/';
                }
        
                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);
                
                if ( ! file_exists(APPPATH.'models/'.$path.$model.EXT))
                {
                        show_error('Unable to locate the model you have specified: '.$model);
                }
                                
                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('Model'))
                {
                        load_class('Model', FALSE);
                }

                require_once(APPPATH.'models/'.$path.$model.EXT);

                $model = ucfirst($model);
                                
                $CI->$name = new $model();
                $CI->$name->_assign_libraries();
                
                $this->_ci_models[] = $name;    
        }
                
        // --------------------------------------------------------------------
        
        /**
         * Database Loader
         *
         * @access      public
         * @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
         */     
        function database($params = '', $return = FALSE, $active_record = FALSE)
        {
                // 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 $active_record == FALSE AND isset($CI->db) AND is_object($CI->db))
                {
                        return FALSE;
                }       
        
                require_once(BASEPATH.'database/DB'.EXT);

                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); 
                
                // Assign the DB object to any existing models
                $this->_ci_assign_to_models();
        }
        
        // --------------------------------------------------------------------

        /**
         * Load the Utilities Class
         *
         * @access      public
         * @return      string          
         */             
        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'.EXT);
                require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_utility'.EXT);
                $class = 'CI_DB_'.$CI->db->dbdriver.'_utility';

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

                $CI->load->_ci_assign_to_models();
        }
        
        // --------------------------------------------------------------------

        /**
         * Load the Database Forge Class
         *
         * @access      public
         * @return      string          
         */             
        function dbforge()
        {
                if ( ! class_exists('CI_DB'))
                {
                        $this->database();
                }
                
                $CI =& get_instance();
        
                require_once(BASEPATH.'database/DB_forge'.EXT);
                require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_forge'.EXT);
                $class = 'CI_DB_'.$CI->db->dbdriver.'_forge';

                $CI->dbforge = new $class();
                
                $CI->load->_ci_assign_to_models();
        }
        
        // --------------------------------------------------------------------
        
        /**
         * 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.
         *
         * @access      public
         * @param       string
         * @param       array
         * @param       bool
         * @return      void
         */
        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
         *
         * @access      public
         * @param       string
         * @param       bool
         * @return      string
         */
        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.
         *
         * @access      public
         * @param       array
         * @return      void
         */
        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;
                        }
                }
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Load Helper
         *
         * This function loads the specified helper file.
         *
         * @access      public
         * @param       mixed
         * @return      void
         */
        function helper($helpers = array())
        {
                if ( ! is_array($helpers))
                {
                        $helpers = array($helpers);
                }
        
                foreach ($helpers as $helper)
                {               
                        $helper = strtolower(str_replace(EXT, '', str_replace('_helper', '', $helper)).'_helper');

                        if (isset($this->_ci_helpers[$helper]))
                        {
                                continue;
                        }
                        
                        $ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.EXT;

                        // Is this a helper extension request?                  
                        if (file_exists($ext_helper))
                        {
                                $base_helper = BASEPATH.'helpers/'.$helper.EXT;
                                
                                if ( ! file_exists($base_helper))
                                {
                                        show_error('Unable to load the requested file: helpers/'.$helper.EXT);
                                }
                                
                                include_once($ext_helper);
                                include_once($base_helper);
                        }
                        elseif (file_exists(APPPATH.'helpers/'.$helper.EXT))
                        { 
                                include_once(APPPATH.'helpers/'.$helper.EXT);
                        }
                        else
                        {               
                                if (file_exists(BASEPATH.'helpers/'.$helper.EXT))
                                {
                                        include_once(BASEPATH.'helpers/'.$helper.EXT);
                                }
                                else
                                {
                                        show_error('Unable to load the requested file: helpers/'.$helper.EXT);
                                }
                        }

                        $this->_ci_helpers[$helper] = TRUE;
                        log_message('debug', 'Helper loaded: '.$helper);        
                }               
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Load Helpers
         *
         * This is simply an alias to the above function in case the
         * user has written the plural form of this function.
         *
         * @access      public
         * @param       array
         * @return      void
         */
        function helpers($helpers = array())
        {
                $this->helper($helpers);
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Load Plugin
         *
         * This function loads the specified plugin.
         *
         * @access      public
         * @param       array
         * @return      void
         */
        function plugin($plugins = array())
        {
                if ( ! is_array($plugins))
                {
                        $plugins = array($plugins);
                }
        
                foreach ($plugins as $plugin)
                {       
                        $plugin = strtolower(str_replace(EXT, '', str_replace('_pi', '', $plugin)).'_pi');              

                        if (isset($this->_ci_plugins[$plugin]))
                        {
                                continue;
                        }

                        if (file_exists(APPPATH.'plugins/'.$plugin.EXT))
                        {
                                include_once(APPPATH.'plugins/'.$plugin.EXT);   
                        }
                        else
                        {
                                if (file_exists(BASEPATH.'plugins/'.$plugin.EXT))
                                {
                                        include_once(BASEPATH.'plugins/'.$plugin.EXT);  
                                }
                                else
                                {
                                        show_error('Unable to load the requested file: plugins/'.$plugin.EXT);
                                }
                        }
                        
                        $this->_ci_plugins[$plugin] = TRUE;
                        log_message('debug', 'Plugin loaded: '.$plugin);
                }               
        }

        // --------------------------------------------------------------------
        
        /**
         * Load Plugins
         *
         * This is simply an alias to the above function in case the
         * user has written the plural form of this function.
         *
         * @access      public
         * @param       array
         * @return      void
         */
        function plugins($plugins = array())
        {
                $this->plugin($plugins);
        }
                
        // --------------------------------------------------------------------
        
        /**
         * Loads a language file
         *
         * @access      public
         * @param       array
         * @param       string
         * @return      void
         */
        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 language files for scaffolding
         *
         * @access      public
         * @param       string
         * @return      arra
         */
        function scaffold_language($file = '', $lang = '', $return = FALSE)
        {
                $CI =& get_instance();
                return $CI->lang->load($file, $lang, $return);
        }
        
        // --------------------------------------------------------------------
        
        /**
         * Loads a config file
         *
         * @access      public
         * @param       string
         * @return      void
         */
        function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
        {                       
                $CI =& get_instance();
                $CI->config->load($file, $use_sections, $fail_gracefully);
        }

        // --------------------------------------------------------------------
        
        /**
         * Scaffolding Loader
         *
         * This initializing function works a bit different than the
         * others. It doesn't load the class.  Instead, it simply
         * sets a flag indicating that scaffolding is allowed to be
         * used.  The actual scaffolding function below is
         * called by the front controller based on whether the
         * second segment of the URL matches the "secret" scaffolding
         * word stored in the application/config/routes.php
         *
         * @access      public
         * @param       string
         * @return      void
         */     
        function scaffolding($table = '')
        {               
                if ($table === FALSE)
                {
                        show_error('You must include the name of the table you would like to access when you initialize scaffolding');
                }
                
                $CI =& get_instance();
                $CI->_ci_scaffolding = TRUE;
                $CI->_ci_scaff_table = $table;
        }

        // --------------------------------------------------------------------
                
        /**
         * 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
         *
         * @access      private
         * @param       array
         * @return      void
         */
        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];
                }

                // Set the path to the requested file
                if ($_ci_path == '')
                {
                        $_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);
                        $_ci_file = ($_ci_ext == '') ? $_ci_view.EXT : $_ci_view;
                        $_ci_path = $this->_ci_view_path.$_ci_file;
                }
                else
                {
                        $_ci_x = explode('/', $_ci_path);
                        $_ci_file = end($_ci_x);
                }
                
                if ( ! 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.
                // Only needed when running PHP 5
                
                if ($this->_ci_is_instance())
                {
                        $_ci_CI =& get_instance();
                        foreach (get_object_vars($_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
                {
                        // PHP 4 requires that we use a global
                        global $OUT;
                        $OUT->append_output(ob_get_contents());
                        @ob_end_clean();
                }
        }

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

        /**
         * Load class
         *
         * This function loads the requested class.
         *
         * @access      private
         * @param       string  the item that is being loaded
         * @param       mixed   any additional parameters
         * @param       string  an optional object name
         * @return      void
         */
        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
                $class = str_replace(EXT, '', trim($class, '/'));
        
                // Was the path included with the class name?
                // We look for a slash to determine this
                $subdir = '';
                if (strpos($class, '/') !== FALSE)
                {
                        // explode the path so we can separate the filename from the path
                        $x = explode('/', $class);      
                        
                        // Reset the $class variable now that we know the actual filename
                        $class = end($x);
                        
                        // Kill the filename from the array
                        unset($x[count($x)-1]);
                        
                        // Glue the path back together, sans filename
                        $subdir = implode($x, '/').'/';
                }

                // 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.EXT;

                        // Is this a class extension request?                   
                        if (file_exists($subclass))
                        {
                                $baseclass = BASEPATH.'libraries/'.ucfirst($class).EXT;
                                
                                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.
                        $is_duplicate = FALSE;          
                        for ($i = 1; $i < 3; $i++)
                        {
                                $path = ($i % 2) ? APPPATH : BASEPATH;  
                                $filepath = $path.'libraries/'.$subdir.$class.EXT;
                                
                                // 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
         *
         * @access      private
         * @param       string
         * @param       string
         * @param       string  an optional object name
         * @return      null
         */
        function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL)
        {       
                // Is there an associated config file for this class?
                if ($config === NULL)
                {
                        // We test for both uppercase and lowercase, for servers that
                        // are case-sensitive with regard to file names
                        if (file_exists(APPPATH.'config/'.strtolower($class).EXT))
                        {
                                include_once(APPPATH.'config/'.strtolower($class).EXT);
                        }                       
                        else
                        {
                                if (file_exists(APPPATH.'config/'.ucfirst(strtolower($class)).EXT))
                                {
                                        include_once(APPPATH.'config/'.ucfirst(strtolower($class)).EXT);
                                }                       
                        }
                }
                
                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, plugins, and helpers to be loaded automatically.
         *
         * @access      private
         * @param       array
         * @return      void
         */
        function _ci_autoloader()
        {       
                include_once(APPPATH.'config/autoload'.EXT);
                
                if ( ! isset($autoload))
                {
                        return FALSE;
                }
                
                // Load any custom config file
                if (count($autoload['config']) > 0)
                {                       
                        $CI =& get_instance();
                        foreach ($autoload['config'] as $key => $val)
                        {
                                $CI->config->load($val);
                        }
                }               

                // Autoload plugins, helpers and languages
                foreach (array('helper', 'plugin', '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']))
                {
                        $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 scaffolding
                        if (in_array('scaffolding', $autoload['libraries']))
                        {
                                $this->scaffolding();
                                $autoload['libraries'] = array_diff($autoload['libraries'], array('scaffolding'));
                        }
                
                        // Load all other libraries
                        foreach ($autoload['libraries'] as $item)
                        {
                                $this->library($item);
                        }
                }               

                // Autoload models
                if (isset($autoload['model']))
                {
                        $this->model($autoload['model']);
                }

        }
        
        // --------------------------------------------------------------------

        /**
         * Assign to Models
         *
         * Makes sure that anything loaded by the loader class (libraries, plugins, etc.)
         * will be available to models, if any exist.
         *
         * @access      private
         * @param       object
         * @return      array
         */
        function _ci_assign_to_models()
        {
                if (count($this->_ci_models) == 0)
                {
                        return;
                }
        
                if ($this->_ci_is_instance())
                {
                        $CI =& get_instance();
                        foreach ($this->_ci_models as $model)
                        {                       
                                $CI->$model->_assign_libraries();
                        }
                }
                else
                {               
                        foreach ($this->_ci_models as $model)
                        {                       
                                $this->$model->_assign_libraries();
                        }
                }
        }       

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

        /**
         * Object to Array
         *
         * Takes an object as input and converts the class variables to array key/vals
         *
         * @access      private
         * @param       object
         * @return      array
         */
        function _ci_object_to_array($object)
        {
                return (is_object($object)) ? get_object_vars($object) : $object;
        }

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

        /**
         * Determines whether we should use the CI instance or $this
         *
         * @access      private
         * @return      bool
         */
        function _ci_is_instance()
        {
                if ($this->_ci_is_php5 == TRUE)
                {
                        return TRUE;
                }
        
                global $CI;
                return (is_object($CI)) ? TRUE : FALSE;
        }

}

/* End of file Loader.php */
/* Location: ./system/libraries/Loader.php */