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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
*
* @category Piwik
* @package Piwik
*/
namespace Piwik;
use Exception;
/**
* Piwik auto loader
*
* @package Piwik
*/
class Loader
{
// our class search path; current directory is intentionally excluded
protected static $dirs = array('/core/', '/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 (!preg_match('/^[A-Za-z0-9_\\\\]+$/D', $class)) {
throw new Exception("Invalid class name \"$class\".");
}
// prefixed class
$class = str_replace('_', '/', $class);
// namespace \Piwik\Common
$class = str_replace('\\', '/', $class);
if ($class == 'Piwik') {
return $class;
}
$class = self::removePrefix($class, 'Piwik/');
$class = self::removePrefix($class, 'Plugins/');
return $class;
}
protected static function removePrefix($class, $vendorPrefixToRemove)
{
if (strpos($class, $vendorPrefixToRemove) === 0) {
return substr($class, strlen($vendorPrefixToRemove));
}
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);
if (strpos($class, '\Piwik') === 0
|| strpos($class, 'Piwik') === 0)
{
// Piwik classes are in core/ or plugins/
do {
// auto-discover class location
foreach (self::$dirs as $dir) {
$path = PIWIK_INCLUDE_PATH . $dir . $classPath . '.php';
if (file_exists($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, $lastSlash);
} while (!empty($classPath));
} else {
// non-Piwik classes (e.g., Zend Framework) are in libs/
$path = PIWIK_INCLUDE_PATH . '/libs/' . $classPath . '.php';
if (file_exists($path)) {
require_once $path; // prefixed by PIWIK_INCLUDE_PATH
if (class_exists($class, false) || interface_exists($class, false)) {
return;
}
}
}
throw new Exception("Class \"$class\" not found.");
}
/**
* Autoloader
*
* @param string $class Class name
*/
public static function autoload($class)
{
try {
self::loadClass($class);
} catch (Exception $e) {
}
}
}
// Note: only one __autoload per PHP instance
if (function_exists('spl_autoload_register')) {
// use the SPL autoload stack
spl_autoload_register(array('Piwik\Loader', 'autoload'));
// preserve any existing __autoload
if (function_exists('__autoload')) {
spl_autoload_register('__autoload');
}
} else {
function __autoload($class)
{
Loader::autoload($class);
}
}
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