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<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik;
use Exception;
/**
* Piwik auto loader
*
*/
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;
}
$class = self::removeFirstMatchingPrefix($class, array('/Piwik/', 'Piwik/'));
$class = self::removeFirstMatchingPrefix($class, array('/Plugins/', 'Plugins/'));
return $class;
}
protected static function removeFirstMatchingPrefix($class, $vendorPrefixesToRemove)
{
foreach ($vendorPrefixesToRemove as $prefix) {
if (strpos($class, $prefix) === 0) {
return substr($class, strlen($prefix));
}
}
return $class;
}
private static function isPluginClass($class)
{
return 0 === strpos($class, 'Piwik\Plugins') || 0 === strpos($class, '\Piwik\Plugins');
}
private static function usesPiwikNamespace($class)
{
return 0 === strpos($class, 'Piwik\\') || 0 === strpos($class, '\Piwik\\');
}
/**
* 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 (static::isPluginClass($class)) {
static::tryToLoadClass($class, '/plugins/', $classPath);
} elseif (static::usesPiwikNamespace($class)) {
static::tryToLoadClass($class, '/core/', $classPath);
} else {
// non-Piwik classes (e.g., Zend Framework) are in libs/
static::tryToLoadClass($class, '/libs/', $classPath);
}
}
private static function tryToLoadClass($class, $dir, $classPath)
{
$path = PIWIK_INCLUDE_PATH . $dir . $classPath . '.php';
if (file_exists($path)) {
require_once $path; // prefixed by PIWIK_INCLUDE_PATH
return class_exists($class, false) || interface_exists($class, false);
}
return false;
}
/**
* Autoloader
*
* @param string $class Class name
*/
public static function autoload($class)
{
try {
self::loadClass($class);
} catch (Exception $e) {
}
}
}
// use the SPL autoload stack
spl_autoload_register(array('Piwik\Loader', 'autoload'));
// preserve any existing __autoload
if (function_exists('__autoload')) {
spl_autoload_register('__autoload');
}
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