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/mp-includes/composer/vendor/composer/ -> ClassLoader.php (source)

   1  <?php
   2  
   3  /*
   4   * This file is part of Composer.
   5   *
   6   * (c) Nils Adermann <naderman@naderman.de>
   7   *     Jordi Boggiano <j.boggiano@seld.be>
   8   *
   9   * For the full copyright and license information, please view the LICENSE
  10   * file that was distributed with this source code.
  11   */
  12  
  13  namespace Composer\Autoload;
  14  
  15  /**
  16   * ClassLoader implements a PSR-0, PSR-4 and classmap class loader.
  17   *
  18   *     $loader = new \Composer\Autoload\ClassLoader();
  19   *
  20   *     // register classes with namespaces
  21   *     $loader->add('Symfony\Component', __DIR__.'/component');
  22   *     $loader->add('Symfony',           __DIR__.'/framework');
  23   *
  24   *     // activate the autoloader
  25   *     $loader->register();
  26   *
  27   *     // to enable searching the include path (eg. for PEAR packages)
  28   *     $loader->setUseIncludePath(true);
  29   *
  30   * In this example, if you try to use a class in the Symfony\Component
  31   * namespace or one of its children (Symfony\Component\Console for instance),
  32   * the autoloader will first look for the class under the component/
  33   * directory, and it will then fallback to the framework/ directory if not
  34   * found before giving up.
  35   *
  36   * This class is loosely based on the Symfony UniversalClassLoader.
  37   *
  38   * @author Fabien Potencier <fabien@symfony.com>
  39   * @author Jordi Boggiano <j.boggiano@seld.be>
  40   * @see    http://www.php-fig.org/psr/psr-0/
  41   * @see    http://www.php-fig.org/psr/psr-4/
  42   */
  43  class ClassLoader
  44  {
  45      // PSR-4
  46      private $prefixLengthsPsr4 = array();
  47      private $prefixDirsPsr4 = array();
  48      private $fallbackDirsPsr4 = array();
  49  
  50      // PSR-0
  51      private $prefixesPsr0 = array();
  52      private $fallbackDirsPsr0 = array();
  53  
  54      private $useIncludePath = false;
  55      private $classMap = array();
  56      private $classMapAuthoritative = false;
  57      private $missingClasses = array();
  58      private $apcuPrefix;
  59  
  60      public function getPrefixes()
  61      {
  62          if (!empty($this->prefixesPsr0)) {
  63              return call_user_func_array('array_merge', $this->prefixesPsr0);
  64          }
  65  
  66          return array();
  67      }
  68  
  69      public function getPrefixesPsr4()
  70      {
  71          return $this->prefixDirsPsr4;
  72      }
  73  
  74      public function getFallbackDirs()
  75      {
  76          return $this->fallbackDirsPsr0;
  77      }
  78  
  79      public function getFallbackDirsPsr4()
  80      {
  81          return $this->fallbackDirsPsr4;
  82      }
  83  
  84      public function getClassMap()
  85      {
  86          return $this->classMap;
  87      }
  88  
  89      /**
  90       * @param array $classMap Class to filename map
  91       */
  92      public function addClassMap(array $classMap)
  93      {
  94          if ($this->classMap) {
  95              $this->classMap = array_merge($this->classMap, $classMap);
  96          } else {
  97              $this->classMap = $classMap;
  98          }
  99      }
 100  
 101      /**
 102       * Registers a set of PSR-0 directories for a given prefix, either
 103       * appending or prepending to the ones previously set for this prefix.
 104       *
 105       * @param string       $prefix  The prefix
 106       * @param array|string $paths   The PSR-0 root directories
 107       * @param bool         $prepend Whether to prepend the directories
 108       */
 109      public function add($prefix, $paths, $prepend = false)
 110      {
 111          if (!$prefix) {
 112              if ($prepend) {
 113                  $this->fallbackDirsPsr0 = array_merge(
 114                      (array) $paths,
 115                      $this->fallbackDirsPsr0
 116                  );
 117              } else {
 118                  $this->fallbackDirsPsr0 = array_merge(
 119                      $this->fallbackDirsPsr0,
 120                      (array) $paths
 121                  );
 122              }
 123  
 124              return;
 125          }
 126  
 127          $first = $prefix[0];
 128          if (!isset($this->prefixesPsr0[$first][$prefix])) {
 129              $this->prefixesPsr0[$first][$prefix] = (array) $paths;
 130  
 131              return;
 132          }
 133          if ($prepend) {
 134              $this->prefixesPsr0[$first][$prefix] = array_merge(
 135                  (array) $paths,
 136                  $this->prefixesPsr0[$first][$prefix]
 137              );
 138          } else {
 139              $this->prefixesPsr0[$first][$prefix] = array_merge(
 140                  $this->prefixesPsr0[$first][$prefix],
 141                  (array) $paths
 142              );
 143          }
 144      }
 145  
 146      /**
 147       * Registers a set of PSR-4 directories for a given namespace, either
 148       * appending or prepending to the ones previously set for this namespace.
 149       *
 150       * @param string       $prefix  The prefix/namespace, with trailing '\\'
 151       * @param array|string $paths   The PSR-4 base directories
 152       * @param bool         $prepend Whether to prepend the directories
 153       *
 154       * @throws \InvalidArgumentException
 155       */
 156      public function addPsr4($prefix, $paths, $prepend = false)
 157      {
 158          if (!$prefix) {
 159              // Register directories for the root namespace.
 160              if ($prepend) {
 161                  $this->fallbackDirsPsr4 = array_merge(
 162                      (array) $paths,
 163                      $this->fallbackDirsPsr4
 164                  );
 165              } else {
 166                  $this->fallbackDirsPsr4 = array_merge(
 167                      $this->fallbackDirsPsr4,
 168                      (array) $paths
 169                  );
 170              }
 171          } elseif (!isset($this->prefixDirsPsr4[$prefix])) {
 172              // Register directories for a new namespace.
 173              $length = strlen($prefix);
 174              if ('\\' !== $prefix[$length - 1]) {
 175                  throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
 176              }
 177              $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
 178              $this->prefixDirsPsr4[$prefix] = (array) $paths;
 179          } elseif ($prepend) {
 180              // Prepend directories for an already registered namespace.
 181              $this->prefixDirsPsr4[$prefix] = array_merge(
 182                  (array) $paths,
 183                  $this->prefixDirsPsr4[$prefix]
 184              );
 185          } else {
 186              // Append directories for an already registered namespace.
 187              $this->prefixDirsPsr4[$prefix] = array_merge(
 188                  $this->prefixDirsPsr4[$prefix],
 189                  (array) $paths
 190              );
 191          }
 192      }
 193  
 194      /**
 195       * Registers a set of PSR-0 directories for a given prefix,
 196       * replacing any others previously set for this prefix.
 197       *
 198       * @param string       $prefix The prefix
 199       * @param array|string $paths  The PSR-0 base directories
 200       */
 201      public function set($prefix, $paths)
 202      {
 203          if (!$prefix) {
 204              $this->fallbackDirsPsr0 = (array) $paths;
 205          } else {
 206              $this->prefixesPsr0[$prefix[0]][$prefix] = (array) $paths;
 207          }
 208      }
 209  
 210      /**
 211       * Registers a set of PSR-4 directories for a given namespace,
 212       * replacing any others previously set for this namespace.
 213       *
 214       * @param string       $prefix The prefix/namespace, with trailing '\\'
 215       * @param array|string $paths  The PSR-4 base directories
 216       *
 217       * @throws \InvalidArgumentException
 218       */
 219      public function setPsr4($prefix, $paths)
 220      {
 221          if (!$prefix) {
 222              $this->fallbackDirsPsr4 = (array) $paths;
 223          } else {
 224              $length = strlen($prefix);
 225              if ('\\' !== $prefix[$length - 1]) {
 226                  throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
 227              }
 228              $this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
 229              $this->prefixDirsPsr4[$prefix] = (array) $paths;
 230          }
 231      }
 232  
 233      /**
 234       * Turns on searching the include path for class files.
 235       *
 236       * @param bool $useIncludePath
 237       */
 238      public function setUseIncludePath($useIncludePath)
 239      {
 240          $this->useIncludePath = $useIncludePath;
 241      }
 242  
 243      /**
 244       * Can be used to check if the autoloader uses the include path to check
 245       * for classes.
 246       *
 247       * @return bool
 248       */
 249      public function getUseIncludePath()
 250      {
 251          return $this->useIncludePath;
 252      }
 253  
 254      /**
 255       * Turns off searching the prefix and fallback directories for classes
 256       * that have not been registered with the class map.
 257       *
 258       * @param bool $classMapAuthoritative
 259       */
 260      public function setClassMapAuthoritative($classMapAuthoritative)
 261      {
 262          $this->classMapAuthoritative = $classMapAuthoritative;
 263      }
 264  
 265      /**
 266       * Should class lookup fail if not found in the current class map?
 267       *
 268       * @return bool
 269       */
 270      public function isClassMapAuthoritative()
 271      {
 272          return $this->classMapAuthoritative;
 273      }
 274  
 275      /**
 276       * APCu prefix to use to cache found/not-found classes, if the extension is enabled.
 277       *
 278       * @param string|null $apcuPrefix
 279       */
 280      public function setApcuPrefix($apcuPrefix)
 281      {
 282          $this->apcuPrefix = function_exists('apcu_fetch') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? $apcuPrefix : null;
 283      }
 284  
 285      /**
 286       * The APCu prefix in use, or null if APCu caching is not enabled.
 287       *
 288       * @return string|null
 289       */
 290      public function getApcuPrefix()
 291      {
 292          return $this->apcuPrefix;
 293      }
 294  
 295      /**
 296       * Registers this instance as an autoloader.
 297       *
 298       * @param bool $prepend Whether to prepend the autoloader or not
 299       */
 300      public function register($prepend = false)
 301      {
 302          spl_autoload_register(array($this, 'loadClass'), true, $prepend);
 303      }
 304  
 305      /**
 306       * Unregisters this instance as an autoloader.
 307       */
 308      public function unregister()
 309      {
 310          spl_autoload_unregister(array($this, 'loadClass'));
 311      }
 312  
 313      /**
 314       * Loads the given class or interface.
 315       *
 316       * @param  string    $class The name of the class
 317       * @return bool|null True if loaded, null otherwise
 318       */
 319      public function loadClass($class)
 320      {
 321          if ($file = $this->findFile($class)) {
 322              includeFile($file);
 323  
 324              return true;
 325          }
 326      }
 327  
 328      /**
 329       * Finds the path to the file where the class is defined.
 330       *
 331       * @param string $class The name of the class
 332       *
 333       * @return string|false The path if found, false otherwise
 334       */
 335      public function findFile($class)
 336      {
 337          // class map lookup
 338          if (isset($this->classMap[$class])) {
 339              return $this->classMap[$class];
 340          }
 341          if ($this->classMapAuthoritative || isset($this->missingClasses[$class])) {
 342              return false;
 343          }
 344          if (null !== $this->apcuPrefix) {
 345              $file = apcu_fetch($this->apcuPrefix.$class, $hit);
 346              if ($hit) {
 347                  return $file;
 348              }
 349          }
 350  
 351          $file = $this->findFileWithExtension($class, '.php');
 352  
 353          // Search for Hack files if we are running on HHVM
 354          if (false === $file && defined('HHVM_VERSION')) {
 355              $file = $this->findFileWithExtension($class, '.hh');
 356          }
 357  
 358          if (null !== $this->apcuPrefix) {
 359              apcu_add($this->apcuPrefix.$class, $file);
 360          }
 361  
 362          if (false === $file) {
 363              // Remember that this class does not exist.
 364              $this->missingClasses[$class] = true;
 365          }
 366  
 367          return $file;
 368      }
 369  
 370      private function findFileWithExtension($class, $ext)
 371      {
 372          // PSR-4 lookup
 373          $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
 374  
 375          $first = $class[0];
 376          if (isset($this->prefixLengthsPsr4[$first])) {
 377              $subPath = $class;
 378              while (false !== $lastPos = strrpos($subPath, '\\')) {
 379                  $subPath = substr($subPath, 0, $lastPos);
 380                  $search = $subPath . '\\';
 381                  if (isset($this->prefixDirsPsr4[$search])) {
 382                      $pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
 383                      foreach ($this->prefixDirsPsr4[$search] as $dir) {
 384                          if (file_exists($file = $dir . $pathEnd)) {
 385                              return $file;
 386                          }
 387                      }
 388                  }
 389              }
 390          }
 391  
 392          // PSR-4 fallback dirs
 393          foreach ($this->fallbackDirsPsr4 as $dir) {
 394              if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) {
 395                  return $file;
 396              }
 397          }
 398  
 399          // PSR-0 lookup
 400          if (false !== $pos = strrpos($class, '\\')) {
 401              // namespaced class name
 402              $logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1)
 403                  . strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
 404          } else {
 405              // PEAR-like class name
 406              $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
 407          }
 408  
 409          if (isset($this->prefixesPsr0[$first])) {
 410              foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) {
 411                  if (0 === strpos($class, $prefix)) {
 412                      foreach ($dirs as $dir) {
 413                          if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
 414                              return $file;
 415                          }
 416                      }
 417                  }
 418              }
 419          }
 420  
 421          // PSR-0 fallback dirs
 422          foreach ($this->fallbackDirsPsr0 as $dir) {
 423              if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
 424                  return $file;
 425              }
 426          }
 427  
 428          // PSR-0 include paths.
 429          if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) {
 430              return $file;
 431          }
 432  
 433          return false;
 434      }
 435  }
 436  
 437  /**
 438   * Scope isolated include.
 439   *
 440   * Prevents access to $this/self from included files.
 441   */
 442  function includeFile($file)
 443  {
 444      include $file;
 445  }


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