--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ClassLoader;
+
+/**
+ * ClassLoader implements an PSR-0 class loader.
+ *
+ * See https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md
+ *
+ * $loader = new ClassLoader();
+ *
+ * // register classes with namespaces
+ * $loader->addPrefix('Symfony\Component', __DIR__.'/component');
+ * $loader->addPrefix('Symfony', __DIR__.'/framework');
+ *
+ * // activate the autoloader
+ * $loader->register();
+ *
+ * // to enable searching the include path (e.g. for PEAR packages)
+ * $loader->setUseIncludePath(true);
+ *
+ * In this example, if you try to use a class in the Symfony\Component
+ * namespace or one of its children (Symfony\Component\Console for instance),
+ * the autoloader will first look for the class under the component/
+ * directory, and it will then fallback to the framework/ directory if not
+ * found before giving up.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+class ClassLoader
+{
+ private $prefixes = array();
+ private $fallbackDirs = array();
+ private $useIncludePath = false;
+
+ /**
+ * Returns prefixes.
+ *
+ * @return array
+ */
+ public function getPrefixes()
+ {
+ return $this->prefixes;
+ }
+
+ /**
+ * Returns fallback directories.
+ *
+ * @return array
+ */
+ public function getFallbackDirs()
+ {
+ return $this->fallbackDirs;
+ }
+
+ /**
+ * Adds prefixes.
+ *
+ * @param array $prefixes Prefixes to add
+ */
+ public function addPrefixes(array $prefixes)
+ {
+ foreach ($prefixes as $prefix => $path) {
+ $this->addPrefix($prefix, $path);
+ }
+ }
+
+ /**
+ * Registers a set of classes.
+ *
+ * @param string $prefix The classes prefix
+ * @param array|string $paths The location(s) of the classes
+ */
+ public function addPrefix($prefix, $paths)
+ {
+ if (!$prefix) {
+ foreach ((array) $paths as $path) {
+ $this->fallbackDirs[] = $path;
+ }
+
+ return;
+ }
+ if (isset($this->prefixes[$prefix])) {
+ if (is_array($paths)) {
+ $this->prefixes[$prefix] = array_unique(array_merge(
+ $this->prefixes[$prefix],
+ $paths
+ ));
+ } elseif (!in_array($paths, $this->prefixes[$prefix])) {
+ $this->prefixes[$prefix][] = $paths;
+ }
+ } else {
+ $this->prefixes[$prefix] = array_unique((array) $paths);
+ }
+ }
+
+ /**
+ * Turns on searching the include for class files.
+ *
+ * @param bool $useIncludePath
+ */
+ public function setUseIncludePath($useIncludePath)
+ {
+ $this->useIncludePath = (bool) $useIncludePath;
+ }
+
+ /**
+ * Can be used to check if the autoloader uses the include path to check
+ * for classes.
+ *
+ * @return bool
+ */
+ public function getUseIncludePath()
+ {
+ return $this->useIncludePath;
+ }
+
+ /**
+ * Registers this instance as an autoloader.
+ *
+ * @param bool $prepend Whether to prepend the autoloader or not
+ */
+ public function register($prepend = false)
+ {
+ spl_autoload_register(array($this, 'loadClass'), true, $prepend);
+ }
+
+ /**
+ * Unregisters this instance as an autoloader.
+ */
+ public function unregister()
+ {
+ spl_autoload_unregister(array($this, 'loadClass'));
+ }
+
+ /**
+ * Loads the given class or interface.
+ *
+ * @param string $class The name of the class
+ *
+ * @return bool|null True, if loaded
+ */
+ public function loadClass($class)
+ {
+ if ($file = $this->findFile($class)) {
+ require $file;
+
+ return true;
+ }
+ }
+
+ /**
+ * Finds the path to the file where the class is defined.
+ *
+ * @param string $class The name of the class
+ *
+ * @return string|null The path, if found
+ */
+ public function findFile($class)
+ {
+ if (false !== $pos = strrpos($class, '\\')) {
+ // namespaced class name
+ $classPath = str_replace('\\', DIRECTORY_SEPARATOR, substr($class, 0, $pos)).DIRECTORY_SEPARATOR;
+ $className = substr($class, $pos + 1);
+ } else {
+ // PEAR-like class name
+ $classPath = null;
+ $className = $class;
+ }
+
+ $classPath .= str_replace('_', DIRECTORY_SEPARATOR, $className).'.php';
+
+ foreach ($this->prefixes as $prefix => $dirs) {
+ if ($class === strstr($class, $prefix)) {
+ foreach ($dirs as $dir) {
+ if (file_exists($dir.DIRECTORY_SEPARATOR.$classPath)) {
+ return $dir.DIRECTORY_SEPARATOR.$classPath;
+ }
+ }
+ }
+ }
+
+ foreach ($this->fallbackDirs as $dir) {
+ if (file_exists($dir.DIRECTORY_SEPARATOR.$classPath)) {
+ return $dir.DIRECTORY_SEPARATOR.$classPath;
+ }
+ }
+
+ if ($this->useIncludePath && $file = stream_resolve_include_path($classPath)) {
+ return $file;
+ }
+ }
+}