* Jordi Boggiano * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Composer\Autoload; /** * ClassLoader implements a PSR-0, PSR-4 and classmap class loader. * * $loader = new \Composer\Autoload\ClassLoader(); * * // register classes with namespaces * $loader->add('Symfony\Component', __DIR__.'/component'); * $loader->add('Symfony', __DIR__.'/framework'); * * // activate the autoloader * $loader->register(); * * // to enable searching the include path (eg. 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. * * This class is loosely based on the Symfony UniversalClassLoader. * * @author Fabien Potencier * @author Jordi Boggiano * @see https://www.php-fig.org/psr/psr-0/ * @see https://www.php-fig.org/psr/psr-4/ */ class ClassLoader { /** @var \Closure(string):void */ private static $includeFile; /** @var string|null */ private $vendorDir; // PSR-4 /** * @var array> */ private $prefixLengthsPsr4 = array(); /** * @var array> */ private $prefixDirsPsr4 = array(); /** * @var list */ private $fallbackDirsPsr4 = array(); // PSR-0 /** * List of PSR-0 prefixes * * Structured as array('F (first letter)' => array('Foo\Bar (full prefix)' => array('path', 'path2'))) * * @var array>> */ private $prefixesPsr0 = array(); /** * @var list */ private $fallbackDirsPsr0 = array(); /** @var bool */ private $useIncludePath = false; /** * @var array */ private $classMap = array(); /** @var bool */ private $classMapAuthoritative = false; /** * @var array */ private $missingClasses = array(); /** @var string|null */ private $apcuPrefix; /** * @var array */ private static $registeredLoaders = array(); /** * @param string|null $vendorDir */ public function __construct($vendorDir = null) { $this->vendorDir = $vendorDir; self::initializeIncludeClosure(); } /** * @return array> */ public function getPrefixes() { if (!empty($this->prefixesPsr0)) { return call_user_func_array('array_merge', array_values($this->prefixesPsr0)); } return array(); } /** * @return array> */ public function getPrefixesPsr4() { return $this->prefixDirsPsr4; } /** * @return list */ public function getFallbackDirs() { return $this->fallbackDirsPsr0; } /** * @return list */ public function getFallbackDirsPsr4() { return $this->fallbackDirsPsr4; } /** * @return array Array of classname => path */ public function getClassMap() { return $this->classMap; } /** * @param array $classMap Class to filename map * * @return void */ public function addClassMap(array $classMap) { if ($this->classMap) { $this->classMap = array_merge($this->classMap, $classMap); } else { $this->classMap = $classMap; } } /** * Registers a set of PSR-0 directories for a given prefix, either * appending or prepending to the ones previously set for this prefix. * * @param string $prefix The prefix * @param list|string $paths The PSR-0 root directories * @param bool $prepend Whether to prepend the directories * * @return void */ public function add($prefix, $paths, $prepend = false) { $paths = (array) $paths; if (!$prefix) { if ($prepend) { $this->fallbackDirsPsr0 = array_merge( $paths, $this->fallbackDirsPsr0 ); } else { $this->fallbackDirsPsr0 = array_merge( $this->fallbackDirsPsr0, $paths ); } return; } $first = $prefix[0]; if (!isset($this->prefixesPsr0[$first][$prefix])) { $this->prefixesPsr0[$first][$prefix] = $paths; return; } if ($prepend) { $this->prefixesPsr0[$first][$prefix] = array_merge( $paths, $this->prefixesPsr0[$first][$prefix] ); } else { $this->prefixesPsr0[$first][$prefix] = array_merge( $this->prefixesPsr0[$first][$prefix], $paths ); } } /** * Registers a set of PSR-4 directories for a given namespace, either * appending or prepending to the ones previously set for this namespace. * * @param string $prefix The prefix/namespace, with trailing '\\' * @param list|string $paths The PSR-4 base directories * @param bool $prepend Whether to prepend the directories * * @throws \InvalidArgumentException * * @return void */ public function addPsr4($prefix, $paths, $prepend = false) { $paths = (array) $paths; if (!$prefix) { // Register directories for the root namespace. if ($prepend) { $this->fallbackDirsPsr4 = array_merge( $paths, $this->fallbackDirsPsr4 ); } else { $this->fallbackDirsPsr4 = array_merge( $this->fallbackDirsPsr4, $paths ); } } elseif (!isset($this->prefixDirsPsr4[$prefix])) { // Register directories for a new namespace. $length = strlen($prefix); if ('\\' !== $prefix[$length - 1]) { throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator."); } $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length; $this->prefixDirsPsr4[$prefix] = $paths; } elseif ($prepend) { // Prepend directories for an already registered namespace. $this->prefixDirsPsr4[$prefix] = array_merge( $paths, $this->prefixDirsPsr4[$prefix] ); } else { // Append directories for an already registered namespace. $this->prefixDirsPsr4[$prefix] = array_merge( $this->prefixDirsPsr4[$prefix], $paths ); } } /** * Registers a set of PSR-0 directories for a given prefix, * replacing any others previously set for this prefix. * * @param string $prefix The prefix * @param list|string $paths The PSR-0 base directories * * @return void */ public function set($prefix, $paths) { if (!$prefix) { $this->fallbackDirsPsr0 = (array) $paths; } else { $this->prefixesPsr0[$prefix[0]][$prefix] = (array) $paths; } } /** * Registers a set of PSR-4 directories for a given namespace, * replacing any others previously set for this namespace. * * @param string $prefix The prefix/namespace, with trailing '\\' * @param list|string $paths The PSR-4 base directories * * @throws \InvalidArgumentException * * @return void */ public function setPsr4($prefix, $paths) { if (!$prefix) { $this->fallbackDirsPsr4 = (array) $paths; } else { $length = strlen($prefix); if ('\\' !== $prefix[$length - 1]) { throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator."); } $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length; $this->prefixDirsPsr4[$prefix] = (array) $paths; } } /** * Turns on searching the include path for class files. * * @param bool $useIncludePath * * @return void */ public function setUseIncludePath($useIncludePath) { $this->useIncludePath = $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; } /** * Turns off searching the prefix and fallback directories for classes * that have not been registered with the class map. * * @param bool $classMapAuthoritative * * @return void */ public function setClassMapAuthoritative($classMapAuthoritative) { $this->classMapAuthoritative = $classMapAuthoritative; } /** * Should class lookup fail if not found in the current class map? * * @return bool */ public function isClassMapAuthoritative() { return $this->classMapAuthoritative; } /** * APCu prefix to use to cache found/not-found classes, if the extension is enabled. * * @param string|null $apcuPrefix * * @return void */ public function setApcuPrefix($apcuPrefix) { $this->apcuPrefix = function_exists('apcu_fetch') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? $apcuPrefix : null; } /** * The APCu prefix in use, or null if APCu caching is not enabled. * * @return string|null */ public function getApcuPrefix() { return $this->apcuPrefix; } /** * Registers this instance as an autoloader. * * @param bool $prepend Whether to prepend the autoloader or not * * @return void */ public function register($prepend = false) { spl_autoload_register(array($this, 'loadClass'), true, $prepend); if (null === $this->vendorDir) { return; } if ($prepend) { self::$registeredLoaders = array($this->vendorDir => $this) + self::$registeredLoaders; } else { unset(self::$registeredLoaders[$this->vendorDir]); self::$registeredLoaders[$this->vendorDir] = $this; } } /** * Unregisters this instance as an autoloader. * * @return void */ public function unregister() { spl_autoload_unregister(array($this, 'loadClass')); if (null !== $this->vendorDir) { unset(self::$registeredLoaders[$this->vendorDir]); } } /** * Loads the given class or interface. * * @param string $class The name of the class * @return true|null True if loaded, null otherwise */ public function loadClass($class) { if ($file = $this->findFile($class)) { $includeFile = self::$includeFile; $includeFile($file); return true; } return null; } /** * Finds the path to the file where the class is defined. * * @param string $class The name of the class * * @return string|false The path if found, false otherwise */ public function findFile($class) { // class map lookup if (isset($this->classMap[$class])) { return $this->classMap[$class]; } if ($this->classMapAuthoritative || isset($this->missingClasses[$class])) { return false; } if (null !== $this->apcuPrefix) { $file = apcu_fetch($this->apcuPrefix.$class, $hit); if ($hit) { return $file; } } $file = $this->findFileWithExtension($class, '.php'); // Search for Hack files if we are running on HHVM if (false === $file && defined('HHVM_VERSION')) { $file = $this->findFileWithExtension($class, '.hh'); } if (null !== $this->apcuPrefix) { apcu_add($this->apcuPrefix.$class, $file); } if (false === $file) { // Remember that this class does not exist. $this->missingClasses[$class] = true; } return $file; } /** * Returns the currently registered loaders keyed by their corresponding vendor directories. * * @return array */ public static function getRegisteredLoaders() { return self::$registeredLoaders; } /** * @param string $class * @param string $ext * @return string|false */ private function findFileWithExtension($class, $ext) { // PSR-4 lookup $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext; $first = $class[0]; if (isset($this->prefixLengthsPsr4[$first])) { $subPath = $class; while (false !== $lastPos = strrpos($subPath, '\\')) { $subPath = substr($subPath, 0, $lastPos); $search = $subPath . '\\'; if (isset($this->prefixDirsPsr4[$search])) { $pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1); foreach ($this->prefixDirsPsr4[$search] as $dir) { if (file_exists($file = $dir . $pathEnd)) { return $file; } } } } } // PSR-4 fallback dirs foreach ($this->fallbackDirsPsr4 as $dir) { if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) { return $file; } } // PSR-0 lookup if (false !== $pos = strrpos($class, '\\')) { // namespaced class name $logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1) . strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR); } else { // PEAR-like class name $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext; } if (isset($this->prefixesPsr0[$first])) { foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) { if (0 === strpos($class, $prefix)) { foreach ($dirs as $dir) { if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) { return $file; } } } } } // PSR-0 fallback dirs foreach ($this->fallbackDirsPsr0 as $dir) { if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) { return $file; } } // PSR-0 include paths. if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) { return $file; } return false; } /** * @return void */ private static function initializeIncludeClosure() { if (self::$includeFile !== null) { return; } /** * Scope isolated include. * * Prevents access to $this/self from included files. * * @param string $file * @return void */ self::$includeFile = \Closure::bind(static function($file) { include $file; }, null, null); } }