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Autoloader.php
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Autoloader.php
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<?php
namespace Bart;
/**
* Autoload classes in defined load paths
* Automatically stacks into the spl_register_autoload() method
*
* Default to class hierarchy in $BART_DIR/src
*/
class Autoloader
{
// All paths associated with autloading
private static $load_paths = array();
/**
* Register a root path for autload to start its search
* Autoload will always look in the default load paths
*/
public static function register_autoload_path($path)
{
self::__static__construct();
self::$load_paths[] = $path;
}
/**
* Static initializer
*/
private static function __static__construct()
{
// Should only be run once
if (count(self::$load_paths) > 0) return;
// By default, look in our src tree
self::$load_paths[] = dirname(__DIR__);
}
/**
* Autoload function
*/
public static function autoload($class_name)
{
self::__static__construct();
foreach (self::$load_paths as $load_path)
{
$path = self::path_to_class($load_path, $class_name);
// Null signifies that the class is unknown to this load path
// ...so try again in another load path
if ($path === null) continue;
require_once $path;
return;
}
// Class wasn't found!
// ...let PHP throw an error or try next autoload method
}
/**
* Given a class, return the path to the class
* @param $root root directory from which to start namespace
* @param $class_name Name of class referenced, but not yet in scope
*/
private static function path_to_class($root, $class_name)
{
$namespace_parts = explode('\\', $class_name);
$path = $root . DIRECTORY_SEPARATOR . implode(DIRECTORY_SEPARATOR, $namespace_parts) . '.php';
if (file_exists($path))
{
return $path;
}
// Couldn't find path to class in given load path root
return null;
}
}
spl_autoload_register('\Bart\Autoloader::autoload');