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<?php
/**
* Piwik - Open source web analytics
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html Gpl v3 or later
* @version $Id$
*
* @category Piwik
* @package Piwik
*/
/**
* Piwik auto loader
*
* @package Piwik
*/
class Piwik_Loader
{
// our class search path; current directory is intentionally excluded
protected static $dirs = array( '/core/', '/libs/', '/plugins/' );
/**
* Get class file name
*
* @param string $class Class name
* @return string Class file name
* @throws Exception if class name is invalid
*/
protected static function getClassFileName($class)
{
if(strspn($class, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890_') !== strlen($class))
{
throw new Exception("Invalid class name \"$class\".");
}
$class = str_replace('_', '/', $class);
if($class == 'Piwik')
{
return $class;
}
if(substr($class, 0, 6) == 'Piwik/')
{
return substr($class, 6);
}
return $class;
}
/**
* Load class by name
*
* @param string $class Class name
* @throws Exception if class not found
*/
public static function loadClass($class)
{
$classPath = self::getClassFileName($class);
while(!empty($classPath))
{
// auto-discover class location
for($i = 0; $i < count(self::$dirs); $i++)
{
$path = PIWIK_INCLUDE_PATH . self::$dirs[$i] . $classPath . '.php';
if(file_exists($path))
{
require_once $path; // prefixed by PIWIK_INCLUDE_PATH
if(class_exists($class, false) || interface_exists($class, false))
{
return;
}
}
}
// truncate to find file with multiple class definitions
$lastSlash = strrpos($classPath, '/');
$classPath = ($lastSlash === false) ? '' : substr($classPath, 0, $lastSlash);
}
throw new Exception("Class \"$class\" not found.");
}
/**
* Autoloader
*
* @param string $class Class name
*/
public static function autoload($class)
{
try {
@self::loadClass($class);
} catch (Exception $e) {
}
}
}
// Note: only one __autoload per PHP instance
if(function_exists('spl_autoload_register'))
{
// use the SPL autoload stack
spl_autoload_register(array('Piwik_Loader', 'autoload'));
// preserve any existing __autoload
if(function_exists('__autoload'))
{
spl_auto_register('__autoload');
}
}
else
{
function __autoload($class)
{
Piwik_Loader::autoload($class);
}
}
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