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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* Loader Class
*
* Loads framework components.
*
* @package CodeIgniter
* @subpackage Libraries
* @category Loader
* @author EllisLab Dev Team
* @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
*/
protected $_ci_ob_level;
/**
* List of paths to load views from
*
* @var array
*/
protected $_ci_view_paths = array();
/**
* List of paths to load libraries from
*
* @var array
*/
protected $_ci_library_paths = array();
/**
* List of paths to load models from
*
* @var array
*/
protected $_ci_model_paths = array();
/**
* List of paths to load helpers from
*
* @var array
*/
protected $_ci_helper_paths = array();
/**
* List of loaded base classes
*
* @var array
*/
protected $_base_classes = array(); // Set by the controller class
/**
* List of cached variables
*
* @var array
*/
protected $_ci_cached_vars = array();
/**
* List of loaded classes
*
* @var array
*/
protected $_ci_classes = array();
/**
* List of loaded files
*
* @var array
*/
protected $_ci_loaded_files = array();
/**
* List of loaded models
*
* @var array
*/
protected $_ci_models = array();
/**
* List of loaded helpers
*
* @var array
*/
protected $_ci_helpers = array();
/**
* List of class name mappings
*
* @var array
*/
protected $_ci_varmap = array(
'unit_test' => 'unit',
'user_agent' => 'agent'
);
/**
* Class constructor
*
* Sets component load paths, gets the initial output buffering level.
*
* @return void
*/
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(VIEWPATH => TRUE);
log_message('debug', 'Loader Class Initialized');
}
// --------------------------------------------------------------------
/**
* Initializer
*
* @todo Figure out a way to move this to the constructor
* without breaking *package_path*() methods.
* @uses CI_Loader::_ci_autoloader()
* @used-by CI_Controller::__construct()
* @return void
*/
public function initialize()
{
$this->_base_classes =& is_loaded();
$this->_ci_autoloader();
}
// --------------------------------------------------------------------
/**
* Is Loaded
*
* A utility method to test if a class is in the self::$_ci_classes array.
*
* @used-by Mainly used by Form Helper function _get_validation_object().
*
* @param string $class Class name to check for
* @return string|bool Class object name if loaded or FALSE
*/
public function is_loaded($class)
{
return isset($this->_ci_classes[$class]) ? $this->_ci_classes[$class] : FALSE;
}
// --------------------------------------------------------------------
/**
* Library Loader
*
* Loads and instantiates libraries.
* Designed to be called from application controllers.
*
* @param string $library Library name
* @param array $params Optional parameters to pass to the library class constructor
* @param string $object_name An optional object name to assign to
* @return void
*/
public function library($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;
}
if ( ! is_null($params) && ! is_array($params))
{
$params = NULL;
}
$this->_ci_load_class($library, $params, $object_name);
}
// --------------------------------------------------------------------
/**
* Model Loader
*
* Loads and instantiates libraries.
*
* @param string $model Model name
* @param string $name An optional object name to assign to
* @param bool $db_conn An optional database connection configuration to initialize
* @return void
*/
public function model($model, $name = '', $db_conn = FALSE)
{
if (empty($model))
{
return;
}
elseif (is_array($model))
{
foreach ($model as $class)
{
$this->model($class);
}
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);
// And the model name behind it
$model = substr($model, $last_slash);
}
if (empty($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 ($db_conn !== FALSE && ! class_exists('CI_DB'))
{
if ($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 mixed $params Database configuration options
* @param bool $return Whether to return the database object
* @param bool $query_builder Whether to enable Query Builder
* (overrides the configuration setting)
*
* @return void|object|bool Database object if $return is set to TRUE,
* FALSE on failure, void in any other case
*/
public function database($params = '', $return = FALSE, $query_builder = NULL)
{
// Grab the super object
$CI =& get_instance();
// Do we even need to load the database class?
if ($return === FALSE && $query_builder === NULL && isset($CI->db) && is_object($CI->db) && ! empty($CI->db->conn_id))
{
return FALSE;
}
require_once(BASEPATH.'database/DB.php');
if ($return === TRUE)
{
return DB($params, $query_builder);
}
// Initialize the db variable. Needed to prevent
// reference errors with some configurations
$CI->db = '';
// Load the DB class
$CI->db =& DB($params, $query_builder);
}
// --------------------------------------------------------------------
/**
* Load the Database Utilities Class
*
* @param object $db Database object
* @param bool $return Whether to return the DB Forge class object or not
* @return void|object
*/
public function dbutil($db = NULL, $return = FALSE)
{
$CI =& get_instance();
if ( ! is_object($db) OR ! ($db instanceof CI_DB))
{
class_exists('CI_DB', FALSE) OR $this->database();
$db =& $CI->db;
}
require_once(BASEPATH.'database/DB_utility.php');
require_once(BASEPATH.'database/drivers/'.$db->dbdriver.'/'.$db->dbdriver.'_utility.php');
$class = 'CI_DB_'.$db->dbdriver.'_utility';
if ($return === TRUE)
{
return new $class($db);
}
$CI->dbutil = new $class($db);
}
// --------------------------------------------------------------------
/**
* Load the Database Forge Class
*
* @param object $db Database object
* @param bool $return Whether to return the DB Forge class object or not
* @return void|object
*/
public function dbforge($db = NULL, $return = FALSE)
{
$CI =& get_instance();
if ( ! is_object($db) OR ! ($db instanceof CI_DB))
{
class_exists('CI_DB', FALSE) OR $this->database();
$db =& $CI->db;
}
require_once(BASEPATH.'database/DB_forge.php');
require_once(BASEPATH.'database/drivers/'.$db->dbdriver.'/'.$db->dbdriver.'_forge.php');
if ( ! empty($db->subdriver))
{
$driver_path = BASEPATH.'database/drivers/'.$db->dbdriver.'/subdrivers/'.$db->dbdriver.'_'.$db->subdriver.'_forge.php';
if (file_exists($driver_path))
{
require_once($driver_path);
$class = 'CI_DB_'.$db->dbdriver.'_'.$db->subdriver.'_forge';
}
}
else
{
$class = 'CI_DB_'.$db->dbdriver.'_forge';
}
if ($return === TRUE)
{
return new $class($db);
}
$CI->dbforge = new $class($db);
}
// --------------------------------------------------------------------
/**
* View Loader
*
* Loads "view" files.
*
* @param string $view View name
* @param array $vars An associative array of data
* to be extracted for use in the view
* @param bool $return Whether to return the view output
* or leave it to the Output class
* @return void
*/
public function view($view, $vars = array(), $return = FALSE)
{
return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));
}
// --------------------------------------------------------------------
/**
* Generic File Loader
*
* @param string $path File path
* @param bool $return Whether to return the file output
* @return void|string
*/
public function file($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|object|string $vars
* An associative array or object containing values
* to be set, or a value's name if string
* @param string $val Value to set, only used if $vars is a string
* @return void
*/
public function vars($vars = array(), $val = '')
{
if ($val !== '' && is_string($vars))
{
$vars = array($vars => $val);
}
$vars = $this->_ci_object_to_array($vars);
if (is_array($vars) && count($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 string $key Variable name
* @return mixed The variable or NULL if not found
*/
public function get_var($key)
{
return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;
}
// --------------------------------------------------------------------
/**
* Get Variables
*
* Retrieves all loaded variables.
*
* @return array
*/
public function get_vars()
{
return $this->_ci_cached_vars;
}
// --------------------------------------------------------------------
/**
* Helper Loader
*
* @param string|string[] $helpers Helper name(s)
* @return void
*/
public function helper($helpers = array())
{
foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper)
{
if (isset($this->_ci_helpers[$helper]))
{
continue;
}
// Is this a helper extension request?
$ext_helper = config_item('subclass_prefix').$helper;
$ext_loaded = FALSE;
foreach ($this->_ci_helper_paths as $path)
{
if (file_exists($path.'helpers/'.$ext_helper.'.php'))
{
include_once($path.'helpers/'.$ext_helper.'.php');
$ext_loaded = TRUE;
}
}
// If we have loaded extensions - check if the base one is here
if ($ext_loaded === TRUE)
{
$base_helper = BASEPATH.'helpers/'.$helper.'.php';
if ( ! file_exists($base_helper))
{
show_error('Unable to load the requested file: helpers/'.$helper.'.php');
}
include_once($base_helper);
$this->_ci_helpers[$helper] = TRUE;
log_message('debug', 'Helper loaded: '.$helper);
continue;
}
// No extensions found ... try loading regular helpers and/or overrides
foreach ($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
*
* An alias for the helper() method in case the developer has
* written the plural form of it.
*
* @uses CI_Loader::helper()
* @param string|string[] $helpers Helper name(s)
* @return void
*/
public function helpers($helpers = array())
{
$this->helper($helpers);
}
// --------------------------------------------------------------------
/**
* Language Loader
*
* Loads language files.
*
* @param string|string[] $files List of language file names to load
* @param string Language name
* @return void
*/
public function language($files = array(), $lang = '')
{
$CI =& get_instance();
is_array($files) OR $files = array($files);
foreach ($files as $langfile)
{
$CI->lang->load($langfile, $lang);
}
}
// --------------------------------------------------------------------
/**
* Config Loader
*
* Loads a config file (an alias for CI_Config::load()).
*
* @uses CI_Config::load()
* @param string $file Configuration file name
* @param bool $use_sections Whether configuration values should be loaded into their own section
* @param bool $fail_gracefully Whether to just return FALSE or display an error message
* @return bool TRUE if the file was loaded correctly or FALSE on failure
*/
public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
{
$CI =& get_instance();
return $CI->config->load($file, $use_sections, $fail_gracefully);
}
// --------------------------------------------------------------------
/**
* Driver Loader
*
* Loads a driver library.
*
* @param string|string[] $library Driver name(s)
* @param array $params Optional parameters to pass to the driver
* @param string $object_name An optional object name to assign to
*
* @return void|object|bool Object or FALSE on failure if $library is a string
* and $object_name is set. void otherwise.
*/
public function driver($library = '', $params = NULL, $object_name = NULL)
{
if (is_array($library))
{
foreach ($library as $driver)
{
$this->driver($driver);
}
return;
}
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, $object_name);
}
// --------------------------------------------------------------------
/**
* Add Package Path
*
* Prepends a parent path to the library, model, helper and config
* path arrays.
*
* @see CI_Loader::$_ci_library_paths
* @see CI_Loader::$_ci_model_paths
* @see CI_Loader::$_ci_helper_paths
* @see CI_Config::$_config_paths
*
* @param string $path Path to add
* @param bool $view_cascade (default: TRUE)
* @return void
*/
public function add_package_path($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 =& $this->_ci_get_component('config');
array_push($config->_config_paths, $path);
}
// --------------------------------------------------------------------
/**
* Get Package Paths
*
* Return a list of all package paths.
*
* @param bool $include_base Whether to include BASEPATH (default: TRUE)
* @return array
*/
public function get_package_paths($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, helper and/or config
* path arrays if it exists. If no path is provided, the most recently
* added path will be removed removed.
*
* @param string $path Path to remove
* @return void
*/
public function remove_package_path($path = '')
{
$config =& $this->_ci_get_component('config');
if ($path === '')
{
array_shift($this->_ci_library_paths);
array_shift($this->_ci_model_paths);
array_shift($this->_ci_helper_paths);
array_shift($this->_ci_view_paths);
array_pop($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)));
}
// --------------------------------------------------------------------
/**
* Internal CI Data Loader
*
* Used to load views and files.
*
* Variables are prefixed with _ci_ to avoid symbol collision with
* variables made available to view files.
*
* @used-by CI_Loader::view()
* @used-by CI_Loader::file()
* @param array $_ci_data Data to load
* @return void
*/
protected function _ci_load($_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]) ? $_ci_data[$_ci_val] : FALSE;
}
$file_exists = FALSE;
// Set the path to the requested file
if (is_string($_ci_path) && $_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 $_ci_view_file => $cascade)
{
if (file_exists($_ci_view_file.$_ci_file))
{
$_ci_path = $_ci_view_file.$_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 ( ! is_php('5.4') && (bool) @ini_get('short_open_tag') === FALSE
&& config_item('rewrite_short_tags') === TRUE && function_usable('eval')
)
{
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();
}
}
// --------------------------------------------------------------------
/**
* Internal CI Class Loader
*
* @used-by CI_Loader::library()
* @uses CI_Loader::_ci_init_class()
*
* @param string $class Class name to load
* @param mixed $params Optional parameters to pass to the class constructor
* @param string $object_name Optional object name to assign to
* @return void
*/
protected function _ci_load_class($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);
// Get the filename from the path
$class = substr($class, $last_slash);
}
// Establish subdirectories to try - if one was specified, just use that
$trysubs = array($subdir);
if ($subdir === '')
{
// Also check subdirectories matching class name
// This allows us to find libraries in self-named subdirectories
// (like Drivers) and extensions for those in the main libraries dir
$dir = strtolower($class).'/';
$trysubs[] = ucfirst($dir);
// If we aren't case-insensitive, check lowercase too
if (DIRECTORY_SEPARATOR !== '\\')
{
$trysubs[] = $dir;
}
}
// Get the subclass prefix
$prefix = config_item('subclass_prefix');
// We'll test for both lowercase and capitalized versions of the file name
$cases = array(ucfirst($class));
if (DIRECTORY_SEPARATOR !== '\\')
{
// Case-sensitive - try lowercase too
$cases[] = strtolower($class);
}
foreach ($cases as $class)
{
// Is this a class extension request?
foreach($trysubs as $dir)
{
// Check each path for an extension file
$subclass = APPPATH.'libraries/'.$dir.$prefix.$class.'.php';
if (file_exists($subclass))
{
// Require the base class in the same directory
$baseclass = BASEPATH.'libraries/'.$dir.ucfirst($class).'.php';
if ( ! file_exists($baseclass))
{
// No base matches extension - bail
$msg = 'Unable to load the requested class: '.$class;
log_message('error', $msg);
show_error($msg);
}
// Does this look like a driver?
if (strtolower($dir) === strtolower($class).'/' && ! class_exists('CI_Driver_Library'))
{
// We aren't instantiating an object here, just making the base class available
require BASEPATH.'libraries/Driver.php';
}
// 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, $prefix, $params, $object_name);
}
}
$is_duplicate = TRUE;
log_message('debug', $class.' class already loaded. Second attempt ignored.');
return;
}
include($baseclass);
include($subclass);
$this->_ci_loaded_files[] = $subclass;
return $this->_ci_init_class($class, $prefix, $params, $object_name);
}
}
// Lets search for the requested library file and load it.
$is_duplicate = FALSE;
foreach ($this->_ci_library_paths as $path)
{
foreach ($trysubs as $dir)
{
$filepath = $path.'libraries/'.$dir.$class.'.php';
// Does the file exist? No? Bummer...
if ( ! file_exists($filepath))
{
continue;
}
// Does this look like a driver?
if (strtolower($dir) === strtolower($class).'/' && ! class_exists('CI_Driver_Library'))
{
// We aren't instantiating an object here, just making the base class available
require BASEPATH.'libraries/Driver.php';
}
// 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', $class.' class already loaded. Second attempt ignored.');
return;
}
include($filepath);
$this->_ci_loaded_files[] = $filepath;
return $this->_ci_init_class($class, '', $params, $object_name);
}
}
} // END FOREACH
// If we got this far we were unable to find the requested class.
// We do not issue errors if the load call failed due to a duplicate request
if ($is_duplicate === FALSE)
{
log_message('error', 'Unable to load the requested class: '.$class);
show_error('Unable to load the requested class: '.$class);
}
}
// --------------------------------------------------------------------
/**
* Internal CI Class Instantiator
*
* @used-by CI_Loader::_ci_load_class()
*
* @param string $class Class name
* @param string $prefix Class name prefix
* @param array|null|bool $config Optional configuration to pass to the class constructor:
* FALSE to skip;
* NULL to search in config paths;
* array containing configuration data
* @param string $object_name Optional object name to assign to
* @return void
*/
protected function _ci_init_class($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 $path)
{
// We test for both uppercase and lowercase, for servers that
// are case-sensitive with regard to file names. Check for environment
// first, global next
if (defined('ENVIRONMENT') && file_exists($path.'config/'.ENVIRONMENT.'/'.strtolower($class).'.php'))
{
include($path.'config/'.ENVIRONMENT.'/'.strtolower($class).'.php');
break;
}
elseif (defined('ENVIRONMENT') && file_exists($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: '.$name);
}
// 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]) ? $this->_ci_varmap[$class] : $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 $name();
}
}
// --------------------------------------------------------------------
/**
* CI Autoloader
*
* Loads component listed in the config/autoload.php file.
*
* @used-by CI_Loader::initialize()
* @return void
*/
protected function _ci_autoloader()
{
if (defined('ENVIRONMENT') && file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))
{
include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');
}
else
{
include(APPPATH.'config/autoload.php');
}
if ( ! isset($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[$type]) && count($autoload[$type]) > 0)
{
$this->$type($autoload[$type]);
}
}
// Load libraries
if (isset($autoload['libraries']) && count($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 drivers
if (isset($autoload['drivers']))
{
foreach ($autoload['drivers'] as $item)
{
$this->driver($item);
}
}
// Autoload models
if (isset($autoload['model']))
{
$this->model($autoload['model']);
}
}
// --------------------------------------------------------------------
/**
* CI Object to Array translator
*
* Takes an object as input and converts the class variables to
* an associative array with key/value pairs.
*
* @param object $object Object data to translate
* @return array
*/
protected function _ci_object_to_array($object)
{
return is_object($object) ? get_object_vars($object) : $object;
}
// --------------------------------------------------------------------
/**
* CI Component getter
*
* Get a reference to a specific library or model.
*
* @param string $component Component name
* @return bool
*/
protected function &_ci_get_component($component)
{
$CI =& get_instance();
return $CI->$component;
}
// --------------------------------------------------------------------
/**
* Prep filename
*
* This function prepares filenames of various items to
* make their loading more reliable.
*
* @param string|string[] $filename Filename(s)
* @param string $extension Filename extension
* @return array
*/
protected function _ci_prep_filename($filename, $extension)
{
if ( ! is_array($filename))
{
return array(strtolower(str_replace(array($extension, '.php'), '', $filename).$extension));
}
else
{
foreach ($filename as $key => $val)
{
$filename[$key] = strtolower(str_replace(array($extension, '.php'), '', $val).$extension);
}
return $filename;
}
}
}
/* End of file Loader.php */
/* Location: ./system/core/Loader.php */
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