balmet.com

ClassLoader.php (14367B)

---

 <?php
 
 /*
  * This file is part of Composer.
  *
  * (c) Nils Adermann <naderman@naderman.de>
  *     Jordi Boggiano <j.boggiano@seld.be>
  *
  * 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 <fabien@symfony.com>
  * @author Jordi Boggiano <j.boggiano@seld.be>
  * @see    https://www.php-fig.org/psr/psr-0/
  * @see    https://www.php-fig.org/psr/psr-4/
  */
 class ClassLoader
 {
     private $vendorDir;
 
     // PSR-4
     private $prefixLengthsPsr4 = array();
     private $prefixDirsPsr4 = array();
     private $fallbackDirsPsr4 = array();
 
     // PSR-0
     private $prefixesPsr0 = array();
     private $fallbackDirsPsr0 = array();
 
     private $useIncludePath = false;
     private $classMap = array();
     private $classMapAuthoritative = false;
     private $missingClasses = array();
     private $apcuPrefix;
 
     private static $registeredLoaders = array();
 
     public function __construct($vendorDir = null)
     {
         $this->vendorDir = $vendorDir;
     }
 
     public function getPrefixes()
     {
         if (!empty($this->prefixesPsr0)) {
             return call_user_func_array('array_merge', array_values($this->prefixesPsr0));
         }
 
         return array();
     }
 
     public function getPrefixesPsr4()
     {
         return $this->prefixDirsPsr4;
     }
 
     public function getFallbackDirs()
     {
         return $this->fallbackDirsPsr0;
     }
 
     public function getFallbackDirsPsr4()
     {
         return $this->fallbackDirsPsr4;
     }
 
     public function getClassMap()
     {
         return $this->classMap;
     }
 
     /**
      * @param array $classMap Class to filename map
      */
     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 array|string $paths   The PSR-0 root directories
      * @param bool         $prepend Whether to prepend the directories
      */
     public function add($prefix, $paths, $prepend = false)
     {
         if (!$prefix) {
             if ($prepend) {
                 $this->fallbackDirsPsr0 = array_merge(
                     (array) $paths,
                     $this->fallbackDirsPsr0
                 );
             } else {
                 $this->fallbackDirsPsr0 = array_merge(
                     $this->fallbackDirsPsr0,
                     (array) $paths
                 );
             }
 
             return;
         }
 
         $first = $prefix[0];
         if (!isset($this->prefixesPsr0[$first][$prefix])) {
             $this->prefixesPsr0[$first][$prefix] = (array) $paths;
 
             return;
         }
         if ($prepend) {
             $this->prefixesPsr0[$first][$prefix] = array_merge(
                 (array) $paths,
                 $this->prefixesPsr0[$first][$prefix]
             );
         } else {
             $this->prefixesPsr0[$first][$prefix] = array_merge(
                 $this->prefixesPsr0[$first][$prefix],
                 (array) $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 array|string $paths   The PSR-4 base directories
      * @param bool         $prepend Whether to prepend the directories
      *
      * @throws \InvalidArgumentException
      */
     public function addPsr4($prefix, $paths, $prepend = false)
     {
         if (!$prefix) {
             // Register directories for the root namespace.
             if ($prepend) {
                 $this->fallbackDirsPsr4 = array_merge(
                     (array) $paths,
                     $this->fallbackDirsPsr4
                 );
             } else {
                 $this->fallbackDirsPsr4 = array_merge(
                     $this->fallbackDirsPsr4,
                     (array) $paths
                 );
             }
         } elseif (!isset($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] = (array) $paths;
         } elseif ($prepend) {
             // Prepend directories for an already registered namespace.
             $this->prefixDirsPsr4[$prefix] = array_merge(
                 (array) $paths,
                 $this->prefixDirsPsr4[$prefix]
             );
         } else {
             // Append directories for an already registered namespace.
             $this->prefixDirsPsr4[$prefix] = array_merge(
                 $this->prefixDirsPsr4[$prefix],
                 (array) $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 array|string $paths  The PSR-0 base directories
      */
     public function set($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 array|string $paths  The PSR-4 base directories
      *
      * @throws \InvalidArgumentException
      */
     public function setPsr4($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 $useIncludePath
      */
     public function setUseIncludePath($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 $classMapAuthoritative
      */
     public function setClassMapAuthoritative($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 $apcuPrefix
      */
     public function setApcuPrefix($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 $prepend Whether to prepend the autoloader or not
      */
     public function register($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.
      */
     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    $class The name of the class
      * @return bool|null True if loaded, null otherwise
      */
     public function loadClass($class)
     {
         if ($file = $this->findFile($class)) {
             includeFile($file);
 
             return true;
         }
     }
 
     /**
      * 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 indexed by their corresponding vendor directories.
      *
      * @return self[]
      */
     public static function getRegisteredLoaders()
     {
         return self::$registeredLoaders;
     }
 
     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;
     }
 }
 
 /**
  * Scope isolated include.
  *
  * Prevents access to $this/self from included files.
  */
 function includeFile($file)
 {
     include $file;
 }