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<?php
/*
|--------------------------------------------------------------------------
| Register AutoLoader
|--------------------------------------------------------------------------
| Vafpress Framework has separated app and core directories, developers can
| put their extension code and configuration at app folder, as everything
| inside app will be loaded first and will override class with the same
| name with core classes.
*/
VP_AutoLoader::add_namespaces(VP_NAMESPACE);
VP_AutoLoader::add_directories(VP_CLASSES_DIR, VP_NAMESPACE);
VP_AutoLoader::register();
class VP_AutoLoader
{
/**
* Indicates if VP_AutoLoader has been registered.
*
* @var boolean
*/
protected static $registered = false;
/**
* The registered directories
*
* @var array
*/
protected static $directories = array();
/**
* THe registered namespaces
*
* @var array
*/
protected static $namespaces = array();
/**
* Autoloading logic
*
* @param String $class Class name
* @return Boolean Whether the loading succeded.
*/
public static function load($class)
{
clearstatcache();
// figure out namespace and halt process if not in our namespace
$namespace = self::discover_namespace($class);
if($namespace === '')
return;
$class = self::normalize_class($class, $namespace);
foreach (self::$directories[$namespace] as $dir)
{
$file = $dir . DIRECTORY_SEPARATOR . $class;
// if( $dir === end(self::$directories) )
// {
// require $file;
// return true;
// }
if (is_link($file))
{
$file = readlink($file);
}
// $real = realpath($file);
// if($real) $file = $real;
if(is_file($file))
{
require $file;
return true;
}
}
}
/**
* Discover namespace from a string
*
* @param String $key A class name or namespaced key
* @return String Namespace
*/
public static function discover_namespace($key)
{
$namespace = '';
foreach (self::$namespaces as $ns)
{
if (strpos($key, $ns) === 0)
{
$namespace = $ns;
break;
}
}
return $namespace;
}
/**
* Register autoloader
*
* @return void
*/
public static function register()
{
if(self::$registered !== TRUE)
{
spl_autoload_register(array('VP_AutoLoader', 'load'));
}
self::$registered = TRUE;
}
/**
* Add a namespace
*
* @return void
*/
public static function add_namespaces($namespaces)
{
self::$namespaces = array_merge(self::$namespaces, (array) $namespaces);
self::$namespaces = array_unique(self::$namespaces);
usort(self::$namespaces, array(self::class, 'sort'));
}
/**
* Sort by length
*/
private static function sort($a, $b)
{
return strlen($b) - strlen($a);
}
/**
* Add directories to the autoloader, loading process will be run in orderly fashion
* of directory addition.
*
* @param String|Array $directories
* @param String $namespace
* @return void
*/
public static function add_directories($directories, $namespace)
{
if(in_array($namespace, self::$namespaces))
{
if(!isset(self::$directories[$namespace]))
self::$directories[$namespace] = array();
self::$directories[$namespace] = array_merge(self::$directories[$namespace], (array) $directories);
self::$directories[$namespace] = array_unique(self::$directories[$namespace]);
}
}
/**
* Remove directories.
*
* @param String|Array $directories
* @return void
*/
public static function remove_directories($directories = null, $namespace = '')
{
// check if namespace existed
if(!in_array($namespace, self::$namespaces))
return;
// annihilate everything if none / null passed
if(is_null($directories))
{
self::$directories[$namespace] = array();
}
else
{
// prepare directories to be filtered
$directories = (array) $directories;
// do the filtering
foreach (self::$directories[$namespace] as $key => $dir)
{
if(in_array($dir, $directories))
{
unset(self::$directories[$namespace][$key]);
}
}
}
}
/**
* Normalize class to be loaded
*
* @param String $class Class name
* @return String Normalized class name
*/
public static function normalize_class($class, $namespace)
{
$class = ltrim($class, '\\');
$class = str_replace($namespace, '', $class);
$class = ltrim($class, '_');
$class = strtolower($class);
return str_replace('_', DIRECTORY_SEPARATOR, $class) . '.php';
}
/**
* Get all directories
*
* @return Array
*/
public static function get_directories()
{
return self::$directories;
}
}
/**
* EOF
*/