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

/**
* Loader Class
*
* Loads views and files
*
* @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.
/**
* CodeIgniter core
*
* @var object
*/
protected $CI;

/**
* Nesting level of the output buffering mechanism
*
* @var int
*/
protected $_ci_ob_level;

/**
* Configured base path (supports unit test override)
*
* @var string
*/
protected $_ci_base_path = BASEPATH;

/**
* Configured app path (supports unit test override)
*
* @var string
*/
protected $_ci_app_path = APPPATH;

/**
* Configured view path (supports unit test override)
*
* @var string
*/
protected $_ci_view_path = VIEWPATH;

/**
* List of paths to load libraries/helpers from
*
* @var array
*/
protected $_ci_library_paths = array();

/**
* List of paths to load models/viewers/controllers from
*
* @var array
*/
protected $_ci_mvc_paths = array();

/**
* List of module paths to load models/viewers/controllers from
*
* @var array
*/
protected $_ci_module_paths = array();

/**
* 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 controllers
*
* @var array
*/
protected $_ci_controllers = 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'
);

/**
* Constructor
*
* Sets default package paths, gets the initial output buffering level,
* and autoloads additional paths and config files
*
* @return void
*/
public function __construct()
{
// Attach parent reference
$this->CI =& get_instance();

// Get initial buffering level
$this->_ci_ob_level = ob_get_level();

// Get library paths with autoloaded package paths
$this->_ci_library_paths = (isset($this->CI->base_paths) && is_array($this->CI->base_paths))
? $this->CI->base_paths : array(APPPATH, BASEPATH);

// Get MVC paths with autoloaded package paths
// Apply cascade default to each one
if (isset($this->CI->app_paths) && is_array($this->CI->app_paths))
{
foreach ($this->CI->app_paths as $path)
{
$this->_ci_mvc_paths[$path] = TRUE;
}
}
else
{
// Use default from constants
$this->_ci_mvc_paths = array(APPPATH => TRUE);
}

// Get module path
$paths = $this->CI->config->item('module_path');
if ($paths)
{
// Validate each path and add to list
foreach ((array) $paths as $path)
{
// Groom and resolve path against includes
// (get root object class for unit test override)
$ciclass = get_class($this->CI);
$path = $ciclass::resolve_path($path);

// If path isn't absolute or resolved against includes, try it against the app path
foreach (array($path, $this->_ci_app_path.ltrim($path, '\/')) as $dir)
{
// Make sure it's a directory with contents (not just '.' and '..')
if (is_dir($dir) && count(array_diff(scandir($dir), array('.', '..'))))
{
// Add to paths and move on to next path
$this->_ci_module_paths[] = $dir;
break;
}
}
}
}

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

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

/**
* 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)
{
return isset($this->_ci_classes[$class]) ? $this->_ci_classes[$class] : 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 Class name
* @param mixed Optional parameters
* @param string 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 === '')
{
return FALSE;
}

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

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

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

/**
* Controller Loader
*
* This function lets users load and instantiate (sub)controllers.
*
* @param mixed Route to controller/method
* @param string Optional controller object name
* @param bool FALSE to skip calling method
* @return mixed Called method return value or NULL if not called
*/
public function controller($route, $name = NULL, $call = TRUE)
{
// Set output flag to be passed
$out = FALSE;
return $this->controller_output($out, $route, $name, $call);
}

/**
* Controller Loader with output capture
*
* This function lets users load and instantiate (sub)controllers and
* return their output as a string.
*
* @param string Reference to output string
* @param mixed Route to controller/method
* @param string Optional controller object name
* @param bool FALSE to skip calling method
* @return mixed Called method return value or NULL if not called
*/
public function controller_output(&$out, $route, $name = NULL, $call = TRUE)
{
// Check for missing class
if (empty($route))
{
return NULL;
}

// Get instance and establish segment stack
if (is_array($route))
{
// Assume segments have been pre-parsed by CI_Router::validate_route() - make sure there's 4
if (count($route) <= CI_Router::SEG_METHOD)
{
show_error('Invalid route stack provided');
}
}
else
{
// Call validate_route() to break URI into segments
$route = $this->CI->router->validate_route(explode('/', $route));
if ($route === FALSE)
{
show_error('The route "'.$route.'" does not resolve to a valid controller');
}
}

// Extract segment parts
$path = array_shift($route);
$subdir = array_shift($route);
$class = array_shift($route);
$method = array_shift($route);

// Set name if not provided
if (empty($name))
{
$name = strtolower($class);
}

// Check if already loaded
if ( ! in_array($name, $this->_ci_controllers, TRUE))
{
// Check for name conflict
if (isset($this->CI->$name))
{
$msg = 'The controller name you are loading is the name of a resource that is already being used: '.$name;
if ($name == 'routed')
{
// This could be a request from Exceptions - avoid recursive calls to show_error
exit($msg);
}
show_error($msg);
}

// Load base class(es) if not already done
if ( ! class_exists('CI_Controller'))
{
$this->_ci_include('Controller', 'core');
}

// Include source and instantiate object
// The Router is responsible for providing a valid path in the route stack
include($path.'controllers/'.$subdir.strtolower($class).'.php');
$classnm = ucfirst($class);
$this->CI->$name = new $classnm();

// Mark as loaded
$this->_ci_controllers[] = $name;
}

// Check call flag
if ($call === FALSE)
{
// Call disabled - we're done here
return NULL;
}

// Check for output
if ($out !== FALSE)
{
// Push a new stack level to capture output
$this->CI->output->stack_push();
}

// Call method and get return value
$result = $this->CI->call_controller($class, $method, $route, $name);

if ($out !== FALSE)
{
// Capture output from stack level
$out = $this->CI->output->stack_pop();
}

return $result;
}

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

/**
* Model Loader
*
* This function lets users load and instantiate models.
*
* @param string Class name
* @param string Optional object name
* @param bool Database connection flag
* @return void
*/
public function model($model, $name = '', $db_conn = FALSE)
{
if (is_array($model))
{
foreach ($model as $class)
{
$this->model($class);
}
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);

// 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;
}

// Check for name conflict
if (isset($this->CI->$name))
{
show_error('The model name you are loading is the name of a resource that is already being used: '.$name);
}

// Load database if needed
if ($db_conn !== FALSE && ! class_exists('CI_DB'))
{
if ($db_conn === TRUE)
{
$db_conn = '';
}

$this->database($db_conn, FALSE, TRUE);
}

// Load base class(es) if not already done
if ( ! class_exists('CI_Model'))
{
$this->_ci_include('Model', 'core');
}

// Search MVC paths for model
$found = FALSE;
$model = strtolower($model);
$file = 'models/'.$path.$model.'.php';
foreach (array_keys($this->_ci_mvc_paths) as $mod_path)
{
// Check each path for filename
if (file_exists($mod_path.$file))
{
// Include source and mark found
include($mod_path.$file);
$found = TRUE;
break;
}
}

// Do we need to keep looking?
if ( ! $found)
{
// Search module paths for model
$file = $path.'models/'.$model.'.php';
foreach ($this->_ci_module_paths as $mod_path)
{
// Does the model exist in the module?
if (file_exists($mod_path.$file))
{
// Include source and mark found
include($mod_path.$file);
$found = TRUE;
break;
}
}
}

// Did we find the model?
if ($found)
{
// Instantiate object
$model = ucfirst($model);
$this->CI->$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 DB credentials
* @param bool Whether to return the DB object
* @param bool Whether to enable query builder (this allows us to override the config setting)
* @return object DB object
*/
public function database($params = '', $return = FALSE, $query_builder = NULL)
{
// Do we even need to load the database class?
if (class_exists('CI_DB') && $return === FALSE && $query_builder === NULL && isset($this->CI->db) && is_object($this->CI->db))
{
return FALSE;
}

require_once($this->_ci_base_path.'database/DB.php');

if ($return === TRUE)
{
return DB($params, $query_builder);
}

// Initialize the db variable. Needed to prevent
// reference errors with some configurations
$this->CI->db = '';

// Load the DB class
$this->CI->db =& DB($params, $query_builder);
}

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

/**
* Load the Utilities Class
*
* @return void
*/
public function dbutil()
{
if ( ! class_exists('CI_DB'))
{
$this->database();
}

// for backwards compatibility, load dbforge so we can extend dbutils off it
// this use is deprecated and strongly discouraged
$this->dbforge();

$driver = $this->CI->db->dbdriver;
require_once($this->_ci_base_path.'database/DB_utility.php');
require_once($this->_ci_base_path.'database/drivers/'.$driver.'/'.$driver.'_utility.php');
$class = 'CI_DB_'.$driver.'_utility';

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

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

/**
* Load the Database Forge Class
*
* @return void
*/
public function dbforge()
{
if ( ! class_exists('CI_DB'))
{
$this->database();
}

$driver = $this->CI->db->dbdriver;
require_once($this->_ci_base_path.'database/DB_forge.php');
require_once($this->_ci_base_path.'database/drivers/'.$driver.'/'.$driver.'_forge.php');
$class = 'CI_DB_'.$driver.'_forge';

$this->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 View name
* @param array Optional vars
* @param bool Return output flag
* @return mixed Output string if requested, otherwise 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 File path
* @param bool Return output flag
* @return mixed Output string if requested, otherwise void
*/
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 mixed Variable name or array of vars
* @param string Variable value
* @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 Variable name
* @return mixed Variable value on success, otherwise NULL
*/
public function get_var($key)
{
return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;
}

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

/**
* Get Variables
*
* Retrieve all loaded variables
*
* @return array All cached variables
*/
public function get_vars()
{
return $this->_ci_cached_vars;
}

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

/**
* Load Helper
*
* This function loads the specified helper file.
*
* @param mixed Helper name or array of names
* @return void
*/
public function helper($helpers = array())
{
// Delegate multiples
if (is_array($helpers))
{
foreach ($helpers as $helper)
{
$this->helper($helper);
}
return;
}

// Prep filename
$helper = strtolower(str_replace(array('.php', '_helper'), '', $helpers)).'_helper';

// Check if already loaded
if (isset($this->_ci_helpers[$helper]))
{
return;
}

// Include helper with any subclass extension
if ($this->_ci_include($helper, 'helpers'))
{
// Mark as loaded and return
$this->_ci_helpers[$helper] = TRUE;
log_message('debug', 'Helper loaded: '.$helper);
return;
}

// Unable to load the 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 mixed Helper name or array of names
* @return void
*/
public function helpers($helpers = array())
{
$this->helper($helpers);
}

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

/**
* Loads a language file
*
* @param mixed File name or array of names
* @param string Optional language
* @return void
*/
public function language($file = array(), $lang = '')
{
if ( ! is_array($file))
{
$file = array($file);
}

foreach ($file as $langfile)
{
$this->CI->lang->load($langfile, $lang);
}
}

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

/**
* Loads a config file
*
* @param string File name
* @param bool Sections flag
* @param bool Fail gracefully flag
* @return void
*/
public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
{
$this->CI->config->load($file, $use_sections, $fail_gracefully);
}

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

/**
* Driver
*
* Loads a driver library
*
* @param mixed Class name or array of classes
* @param mixed Optional parameters
* @param string Optional object name
* @return void
*/
public function driver($library = '', $params = NULL, $object_name = NULL)
{
// Delegate multiples
if (is_array($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, mvc, and config path arrays
*
* @param string Path
* @param bool View cascade flag
* @return void
*/
public function add_package_path($path, $view_cascade = TRUE)
{
// Resolve path
$path = CodeIgniter::resolve_path($path);

// Prepend path to library/helper paths
array_unshift($this->_ci_library_paths, $path);

// Add MVC path with view cascade param
$this->_ci_mvc_paths = array_merge(array($path => $view_cascade), $this->_ci_mvc_paths);

// Prepend config file path
array_push($this->CI->config->_config_paths, $path);
}

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

/**
* Get Package Paths
*
* Return a list of all package paths, by default it will ignore $this->_ci_base_path.
*
* @param bool Include base path flag
* @return array Package paths
*/
public function get_package_paths($include_base = FALSE)
{
return $include_base === TRUE ? $this->_ci_library_paths : array_keys($this->_ci_mvc_paths);
}

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

/**
* Remove Package Path
*
* Remove a path from the library, mvc, and config path arrays if it exists
* If no path is provided, the most recently added path is removed.
*
* @param string Path
* @param bool Remove from config path flag
* @return void
*/
public function remove_package_path($path = '', $remove_config_path = TRUE)
{
if ($path === '')
{
// Shift last added path from each list
array_shift($this->_ci_library_paths);
array_shift($this->_ci_mvc_paths);
if ($remove_config_path)
{
array_pop($this->CI->config->_config_paths);
}
return;
}

// Resolve path
$path = CodeIgniter::resolve_path($path);

// Prevent app path removal - it is a default for all lists
if ($path == $this->_ci_app_path)
{
return;
}

// Unset from library/helper list unless base path
if ($path != $this->_ci_base_path && ($key = array_search($path, $this->_ci_library_paths)) !== FALSE)
{
unset($this->_ci_library_paths[$key]);
}

// Unset path from MVC list
if (isset($this->_ci_mvc_paths[$path]))
{
unset($this->_ci_mvc_paths[$path]);
}

// Unset path from config list
if ($remove_config_path && ($key = array_search($path, $this->CI->config->_config_paths)) !== FALSE)
{
unset($this->CI->config->_config_paths[$key]);
}
}

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

/**
* Get Module Paths
*
* Return a list of all module paths to check within mvc paths for
* subdirectories containing models, views, and controllers
*
* @return array Module paths
*/
public function get_module_paths()
{
// Just return module paths
return $this->_ci_module_paths;
}

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

/**
* Include a file from package paths
*
* This function includes a prefixed subclass file if found, and its base file
*
* @param string File name
* @param string Search directory
* @return void
*/
protected function _ci_include($name, $dir)
{
// Get subclass prefix and build relative file name
$pre = $this->CI->config->item('subclass_prefix');
$file = $dir.'/'.$pre.$name.'.php';

// Search all paths for subclass extension
foreach ($this->_ci_library_paths as $path)
{
// Check each path for extension
$path .= $file;
if (file_exists($path))
{
// Extension found - require base file
$base = $this->_ci_base_path.$dir.'/'.$name.'.php';
if ( ! file_exists($base))
{
// No base for extension found
return FALSE;
}

// Include extension followed by base, so extension overrides base functions
// If this is for a base class, the order won't matter
include_once($path);
include_once($base);
return TRUE;
}
}

// Search all paths for the regular file
$file = $dir.'/'.$name.'.php';
foreach ($this->_ci_library_paths as $path)
{
// Check each path for base
$path .= $file;
if (file_exists($path))
{
// Include file
include_once($path);
return TRUE;
}
}

// File not found
return FALSE;
}

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

/**
* File/View 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 Load parameters
* @return mixed Output if requested, otherwise 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;
}

// Set the path to the requested file
$_ci_exists = FALSE;
if (is_string($_ci_path) && $_ci_path !== '')
{
// General file - extract name from path
$parts = explode('/', $_ci_path);
$_ci_file = end($parts);
unset($parts);
$_ci_exists = file_exists($_ci_path);
}
else
{
// View file - add extension as necessary
$_ci_file = (pathinfo($_ci_view, PATHINFO_EXTENSION) === '') ? $_ci_view.'.php' : $_ci_view;

// Check view path first
if (file_exists($this->_ci_view_path.$_ci_file))
{
$_ci_path = $this->_ci_view_path.$_ci_file;
$_ci_exists = TRUE;
}
else
{
// Search MVC package paths
foreach ($this->_ci_mvc_paths as $_ci_mvc => $_ci_cascade)
{
if (file_exists($_ci_mvc.'views/'.$_ci_file))
{
// Set path, mark existing, and quit
$_ci_path = $_ci_mvc.'views/'.$_ci_file;
$_ci_exists = TRUE;
break;
}

if ( ! $_ci_cascade)
{
// No cascade - stop looking
break;
}
}

// Did we find it?
if ( ! $_ci_exists)
{
// Is a subdirectory included?
$_ci_subdir = '';
if (($_ci_slash = strrpos($_ci_file, '/')) !== FALSE)
{
// The path is in front of the last slash
$_ci_subdir = substr($_ci_file, 0, ++$_ci_slash);

// And the file name behind it
$_ci_file = substr($_ci_file, $_ci_slash);
}
unset($_ci_slash);

// Search module paths for view
$_ci_viewpath = $_ci_subdir.'views/'.$_ci_file;
foreach ($this->_ci_module_paths as $_ci_mod_path)
{
// Does the view exist in the module?
if (file_exists($_ci_mod_path.$_ci_viewpath))
{
// Set path, mark existing, and quit
$_ci_path = $_ci_mod_path.$_ci_viewpath;
$_ci_exists = TRUE;
break;
}
}
}
}
}

// Verify file existence
if ( ! $_ci_exists)
{
show_error('Unable to load the requested file: '.$_ci_file);
}

// This allows anything loaded using $this->load (libraries, models, etc.)
// to become accessible from within the view or file
foreach (get_object_vars($this->CI) as $_ci_key => $_ci_var)
{
if ( ! isset($this->$_ci_key))
{
$this->$_ci_key =& $this->CI->$_ci_key;
}
}

/*
* Extract and cache variables
*
* You can either set variables using the dedicated $this->CI->load->vars()
* function or via the second parameter of this function. We'll merge
* the two types and cache them so that views that are embedded within
* other views can have access to these variables.
*/
if (is_array($_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 && $this->CI->config->item('rewrite_short_tags') === TRUE)
{
echo eval('?>'.preg_replace('/;*\s*\?>/', '; ?>',
str_replace('<?=', '<?php echo ', file_get_contents($_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)
{
return @ob_get_clean();
}

/*
* 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
{
$this->CI->output->append_output(@ob_get_clean());
}
}

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

/**
* Load class
*
* This function loads the requested class.
*
* @param string Class name
* @param mixed Optional parameters
* @param string 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);

// Get the filename from the path
$class = substr($class, $last_slash);

// Check for match and driver base class
if (strtolower(trim($subdir, '/')) == strtolower($class) && ! class_exists('CI_Driver_Library'))
{
// We aren't instantiating an object here, just making the base class available
require $this->_ci_base_path.'libraries/Driver.php';
}
}

// Is this a class extension request?
$pre = $this->CI->config->item('subclass_prefix');
foreach ($this->_ci_library_paths as $path)
{
// Try both upper- and lower-class in path subdirectory
$path .= 'libraries/'.$subdir;
foreach (array(ucfirst($class), strtolower($class)) as $class)
{
$subclass = $path.$pre.$class.'.php';
if (file_exists($subclass))
{
// Found extension - require base class (in base path, no subdir, always capital)
$baseclass = $this->_ci_base_path.'libraries/'.ucfirst($class).'.php';
if ( ! file_exists($baseclass))
{
$msg = 'Unable to load the requested class: '.$class;
log_message('error', $msg);
show_error($msg);
}

// 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) && ! isset($this->CI->$object_name))
{
return $this->_ci_init_class($class, $pre, $params, $object_name);
}

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

// Include base class followed by subclass for inheritance
include_once($baseclass);
include_once($subclass);
$this->_ci_loaded_files[] = $subclass;

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

// Let's search for the requested library file and load it.
foreach ($this->_ci_library_paths as $path)
{
// Try both upper- and lower-class in path subdirectory
$path .= 'libraries/'.$subdir;
foreach (array(ucfirst($class), strtolower($class)) as $class)
{
// Does the file exist? No? Bummer...
$file = $path.$class.'.php';
if ( ! file_exists($file))
{
continue;
}

// Safety: Was the class already loaded by a previous call?
if (in_array($file, $this->_ci_loaded_files))
{
// Before we deem this to be a duplicate request, let's see
// if a custom object name is being supplied. If so, we'll
// return a new instance of the object
if ( ! is_null($object_name) && ! isset($this->CI->$object_name))
{
return $this->_ci_init_class($class, '', $params, $object_name);
}

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

// If this looks like a driver, make sure the base class is loaded
if (strtolower($subdir) == strtolower($class).'/' && ! class_exists('CI_Driver_Library'))
{
// We aren't instantiating an object here, that'll be done by the Library itself
require $this->_ci_base_path.'libraries/Driver.php';
}

include_once($file);
$this->_ci_loaded_files[] = $file;
return $this->_ci_init_class($class, '', $params, $object_name);
}
}

// 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, $object_name);
}
else if (ucfirst($subdir) != $subdir)
{
// Lowercase subdir failed - retry capitalized
$path = ucfirst($subdir).$class;
return $this->_ci_load_class($path, $params, $object_name);
}

// If we got this far we were unable to find the requested class.
$msg = 'Unable to load the requested class: '.$class;
log_message('error', $msg);
show_error($msg);
}

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

/**
* Instantiates a class
*
* @param string Class name
* @param string Class prefix
* @param array Optional configuration
* @param string Optional object name
* @return void
*/
protected function _ci_init_class($class, $prefix = '', $config = NULL, $object_name = NULL)
{
// Do we need to check for configs?
if ($config === NULL)
{
// See if there's a config file for the class
$file = strtolower($class);
$data = $this->CI->config->get($file.'.php', 'config');
if ( ! is_array($data))
{
// Try uppercase
$data = $this->CI->config->get(ucfirst($file).'.php', 'config');
}

// Set config if found
if (is_array($data))
{
$config = $data;
}
}

if ($prefix === '')
{
if (class_exists('CI_'.$class))
{
$name = 'CI_'.$class;
}
elseif (class_exists($this->CI->config->item('subclass_prefix').$class))
{
$name = $this->CI->config->item('subclass_prefix').$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
if ($config !== NULL)
{
$this->CI->$classvar = new $name($config);
}
else
{
$this->CI->$classvar = new $name();
}
}

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

/**
* Autoloader
*
* The config/autoload.php file contains an array that permits sub-systems,
* libraries, and helpers to be loaded automatically.
*
* This function is public, as it's called from CodeIgniter.php.
* However, there is no reason you should ever need to call it directly.
*
* @return void
*/
public function _ci_autoloader()
{
$autoload = $this->CI->_autoload;
unset($this->CI->_autoload);

// Check for autoload array
if (empty($autoload) OR ! is_array($autoload))
{
return FALSE;
}

// Load 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']))
{
// Load the database driver.
$libs = (array) $autoload['libraries'];
$key = array_search('database', $libs);
if ($key !== FALSE)
{
$this->database();
unset($libs[$key]);
}

// Load all other libraries
$this->library($libs);
}

// Load drivers
if (isset($autoload['drivers']))
{
$this->driver($autoload['drivers']);
}

// Load controllers
if (isset($autoload['controller']))
{
// We have to "manually" feed multiples to controller(), since an array
// is treated as a router stack instead of more than one controller
foreach ((array) $autoload['controller'] as $uri)
{
$this->controller($uri);
}
}

// Load 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 Input object
* @return array Array conversion
*/
protected function _ci_object_to_array($object)
{
return is_object($object) ? get_object_vars($object) : $object;
}

}

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