126 lines
3.2 KiB
PHP
126 lines
3.2 KiB
PHP
<?php
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/**
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* Piwik - Open source web analytics
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*
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* @link http://piwik.org
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* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
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*
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*/
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namespace Piwik;
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use Exception;
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/**
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* Piwik auto loader
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*
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*/
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class Loader
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{
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// our class search path; current directory is intentionally excluded
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protected static $dirs = array('/core/', '/plugins/');
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/**
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* Get class file name
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*
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* @param string $class Class name
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* @return string Class file name
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* @throws Exception if class name is invalid
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*/
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protected static function getClassFileName($class)
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{
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if (!preg_match('/^[A-Za-z0-9_\\\\]+$/D', $class)) {
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throw new Exception("Invalid class name \"$class\".");
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}
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// prefixed class
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$class = str_replace('_', '/', $class);
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// namespace \Piwik\Common
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$class = str_replace('\\', '/', $class);
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if ($class == 'Piwik') {
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return $class;
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}
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$class = self::removeFirstMatchingPrefix($class, array('/Piwik/', 'Piwik/'));
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$class = self::removeFirstMatchingPrefix($class, array('/Plugins/', 'Plugins/'));
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return $class;
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}
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protected static function removeFirstMatchingPrefix($class, $vendorPrefixesToRemove)
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{
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foreach ($vendorPrefixesToRemove as $prefix) {
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if (strpos($class, $prefix) === 0) {
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return substr($class, strlen($prefix));
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}
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}
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return $class;
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}
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private static function isPluginClass($class)
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{
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return 0 === strpos($class, 'Piwik\Plugins') || 0 === strpos($class, '\Piwik\Plugins');
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}
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private static function usesPiwikNamespace($class)
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{
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return 0 === strpos($class, 'Piwik\\') || 0 === strpos($class, '\Piwik\\');
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}
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/**
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* Load class by name
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*
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* @param string $class Class name
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* @throws Exception if class not found
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*/
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public static function loadClass($class)
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{
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$classPath = self::getClassFileName($class);
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if (static::isPluginClass($class)) {
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static::tryToLoadClass($class, '/plugins/', $classPath);
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} else if (static::usesPiwikNamespace($class)) {
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static::tryToLoadClass($class, '/core/', $classPath);
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} else {
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// non-Piwik classes (e.g., Zend Framework) are in libs/
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static::tryToLoadClass($class, '/libs/', $classPath);
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}
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}
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private static function tryToLoadClass($class, $dir, $classPath)
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{
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$path = PIWIK_INCLUDE_PATH . $dir . $classPath . '.php';
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if (file_exists($path)) {
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require_once $path; // prefixed by PIWIK_INCLUDE_PATH
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return class_exists($class, false) || interface_exists($class, false);
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}
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return false;
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}
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/**
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* Autoloader
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*
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* @param string $class Class name
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*/
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public static function autoload($class)
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{
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try {
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self::loadClass($class);
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} catch (Exception $e) {
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}
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}
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}
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// use the SPL autoload stack
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spl_autoload_register(array('Piwik\Loader', 'autoload'));
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// preserve any existing __autoload
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if (function_exists('__autoload')) {
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spl_autoload_register('__autoload');
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}
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