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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\Filesystem;
  13  
  14  use Symfony\Component\Filesystem\Exception\FileNotFoundException;
  15  use Symfony\Component\Filesystem\Exception\IOException;
  16  
  17  /**
  18   * Provides basic utility to manipulate the file system.
  19   *
  20   * @author Fabien Potencier <fabien@symfony.com>
  21   */
  22  class Filesystem
  23  {
  24      private static $lastError;
  25  
  26      /**
  27       * Copies a file.
  28       *
  29       * If the target file is older than the origin file, it's always overwritten.
  30       * If the target file is newer, it is overwritten only when the
  31       * $overwriteNewerFiles option is set to true.
  32       *
  33       * @param string $originFile          The original filename
  34       * @param string $targetFile          The target filename
  35       * @param bool   $overwriteNewerFiles If true, target files newer than origin files are overwritten
  36       *
  37       * @throws FileNotFoundException When originFile doesn't exist
  38       * @throws IOException           When copy fails
  39       */
  40      public function copy($originFile, $targetFile, $overwriteNewerFiles = false)
  41      {
  42          $originIsLocal = stream_is_local($originFile) || 0 === stripos($originFile, 'file://');
  43          if ($originIsLocal && !is_file($originFile)) {
  44              throw new FileNotFoundException(sprintf('Failed to copy "%s" because file does not exist.', $originFile), 0, null, $originFile);
  45          }
  46  
  47          $this->mkdir(\dirname($targetFile));
  48  
  49          $doCopy = true;
  50          if (!$overwriteNewerFiles && null === parse_url($originFile, PHP_URL_HOST) && is_file($targetFile)) {
  51              $doCopy = filemtime($originFile) > filemtime($targetFile);
  52          }
  53  
  54          if ($doCopy) {
  55              // https://bugs.php.net/bug.php?id=64634
  56              if (false === $source = @fopen($originFile, 'r')) {
  57                  throw new IOException(sprintf('Failed to copy "%s" to "%s" because source file could not be opened for reading.', $originFile, $targetFile), 0, null, $originFile);
  58              }
  59  
  60              // Stream context created to allow files overwrite when using FTP stream wrapper - disabled by default
  61              if (false === $target = @fopen($targetFile, 'w', null, stream_context_create(array('ftp' => array('overwrite' => true))))) {
  62                  throw new IOException(sprintf('Failed to copy "%s" to "%s" because target file could not be opened for writing.', $originFile, $targetFile), 0, null, $originFile);
  63              }
  64  
  65              $bytesCopied = stream_copy_to_stream($source, $target);
  66              fclose($source);
  67              fclose($target);
  68              unset($source, $target);
  69  
  70              if (!is_file($targetFile)) {
  71                  throw new IOException(sprintf('Failed to copy "%s" to "%s".', $originFile, $targetFile), 0, null, $originFile);
  72              }
  73  
  74              if ($originIsLocal) {
  75                  // Like `cp`, preserve executable permission bits
  76                  @chmod($targetFile, fileperms($targetFile) | (fileperms($originFile) & 0111));
  77  
  78                  if ($bytesCopied !== $bytesOrigin = filesize($originFile)) {
  79                      throw new IOException(sprintf('Failed to copy the whole content of "%s" to "%s" (%g of %g bytes copied).', $originFile, $targetFile, $bytesCopied, $bytesOrigin), 0, null, $originFile);
  80                  }
  81              }
  82          }
  83      }
  84  
  85      /**
  86       * Creates a directory recursively.
  87       *
  88       * @param string|iterable $dirs The directory path
  89       * @param int             $mode The directory mode
  90       *
  91       * @throws IOException On any directory creation failure
  92       */
  93      public function mkdir($dirs, $mode = 0777)
  94      {
  95          foreach ($this->toIterator($dirs) as $dir) {
  96              if (is_dir($dir)) {
  97                  continue;
  98              }
  99  
 100              if (!self::box('mkdir', $dir, $mode, true)) {
 101                  if (!is_dir($dir)) {
 102                      // The directory was not created by a concurrent process. Let's throw an exception with a developer friendly error message if we have one
 103                      if (self::$lastError) {
 104                          throw new IOException(sprintf('Failed to create "%s": %s.', $dir, self::$lastError), 0, null, $dir);
 105                      }
 106                      throw new IOException(sprintf('Failed to create "%s"', $dir), 0, null, $dir);
 107                  }
 108              }
 109          }
 110      }
 111  
 112      /**
 113       * Checks the existence of files or directories.
 114       *
 115       * @param string|iterable $files A filename, an array of files, or a \Traversable instance to check
 116       *
 117       * @return bool true if the file exists, false otherwise
 118       */
 119      public function exists($files)
 120      {
 121          $maxPathLength = PHP_MAXPATHLEN - 2;
 122  
 123          foreach ($this->toIterator($files) as $file) {
 124              if (\strlen($file) > $maxPathLength) {
 125                  throw new IOException(sprintf('Could not check if file exist because path length exceeds %d characters.', $maxPathLength), 0, null, $file);
 126              }
 127  
 128              if (!file_exists($file)) {
 129                  return false;
 130              }
 131          }
 132  
 133          return true;
 134      }
 135  
 136      /**
 137       * Sets access and modification time of file.
 138       *
 139       * @param string|iterable $files A filename, an array of files, or a \Traversable instance to create
 140       * @param int             $time  The touch time as a Unix timestamp
 141       * @param int             $atime The access time as a Unix timestamp
 142       *
 143       * @throws IOException When touch fails
 144       */
 145      public function touch($files, $time = null, $atime = null)
 146      {
 147          foreach ($this->toIterator($files) as $file) {
 148              $touch = $time ? @touch($file, $time, $atime) : @touch($file);
 149              if (true !== $touch) {
 150                  throw new IOException(sprintf('Failed to touch "%s".', $file), 0, null, $file);
 151              }
 152          }
 153      }
 154  
 155      /**
 156       * Removes files or directories.
 157       *
 158       * @param string|iterable $files A filename, an array of files, or a \Traversable instance to remove
 159       *
 160       * @throws IOException When removal fails
 161       */
 162      public function remove($files)
 163      {
 164          if ($files instanceof \Traversable) {
 165              $files = iterator_to_array($files, false);
 166          } elseif (!\is_array($files)) {
 167              $files = array($files);
 168          }
 169          $files = array_reverse($files);
 170          foreach ($files as $file) {
 171              if (is_link($file)) {
 172                  // See https://bugs.php.net/52176
 173                  if (!(self::box('unlink', $file) || '\\' !== \DIRECTORY_SEPARATOR || self::box('rmdir', $file)) && file_exists($file)) {
 174                      throw new IOException(sprintf('Failed to remove symlink "%s": %s.', $file, self::$lastError));
 175                  }
 176              } elseif (is_dir($file)) {
 177                  $this->remove(new \FilesystemIterator($file, \FilesystemIterator::CURRENT_AS_PATHNAME | \FilesystemIterator::SKIP_DOTS));
 178  
 179                  if (!self::box('rmdir', $file) && file_exists($file)) {
 180                      throw new IOException(sprintf('Failed to remove directory "%s": %s.', $file, self::$lastError));
 181                  }
 182              } elseif (!self::box('unlink', $file) && file_exists($file)) {
 183                  throw new IOException(sprintf('Failed to remove file "%s": %s.', $file, self::$lastError));
 184              }
 185          }
 186      }
 187  
 188      /**
 189       * Change mode for an array of files or directories.
 190       *
 191       * @param string|iterable $files     A filename, an array of files, or a \Traversable instance to change mode
 192       * @param int             $mode      The new mode (octal)
 193       * @param int             $umask     The mode mask (octal)
 194       * @param bool            $recursive Whether change the mod recursively or not
 195       *
 196       * @throws IOException When the change fail
 197       */
 198      public function chmod($files, $mode, $umask = 0000, $recursive = false)
 199      {
 200          foreach ($this->toIterator($files) as $file) {
 201              if (true !== @chmod($file, $mode & ~$umask)) {
 202                  throw new IOException(sprintf('Failed to chmod file "%s".', $file), 0, null, $file);
 203              }
 204              if ($recursive && is_dir($file) && !is_link($file)) {
 205                  $this->chmod(new \FilesystemIterator($file), $mode, $umask, true);
 206              }
 207          }
 208      }
 209  
 210      /**
 211       * Change the owner of an array of files or directories.
 212       *
 213       * @param string|iterable $files     A filename, an array of files, or a \Traversable instance to change owner
 214       * @param string          $user      The new owner user name
 215       * @param bool            $recursive Whether change the owner recursively or not
 216       *
 217       * @throws IOException When the change fail
 218       */
 219      public function chown($files, $user, $recursive = false)
 220      {
 221          foreach ($this->toIterator($files) as $file) {
 222              if ($recursive && is_dir($file) && !is_link($file)) {
 223                  $this->chown(new \FilesystemIterator($file), $user, true);
 224              }
 225              if (is_link($file) && \function_exists('lchown')) {
 226                  if (true !== @lchown($file, $user)) {
 227                      throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
 228                  }
 229              } else {
 230                  if (true !== @chown($file, $user)) {
 231                      throw new IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
 232                  }
 233              }
 234          }
 235      }
 236  
 237      /**
 238       * Change the group of an array of files or directories.
 239       *
 240       * @param string|iterable $files     A filename, an array of files, or a \Traversable instance to change group
 241       * @param string          $group     The group name
 242       * @param bool            $recursive Whether change the group recursively or not
 243       *
 244       * @throws IOException When the change fail
 245       */
 246      public function chgrp($files, $group, $recursive = false)
 247      {
 248          foreach ($this->toIterator($files) as $file) {
 249              if ($recursive && is_dir($file) && !is_link($file)) {
 250                  $this->chgrp(new \FilesystemIterator($file), $group, true);
 251              }
 252              if (is_link($file) && \function_exists('lchgrp')) {
 253                  if (true !== @lchgrp($file, $group) || (\defined('HHVM_VERSION') && !posix_getgrnam($group))) {
 254                      throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
 255                  }
 256              } else {
 257                  if (true !== @chgrp($file, $group)) {
 258                      throw new IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
 259                  }
 260              }
 261          }
 262      }
 263  
 264      /**
 265       * Renames a file or a directory.
 266       *
 267       * @param string $origin    The origin filename or directory
 268       * @param string $target    The new filename or directory
 269       * @param bool   $overwrite Whether to overwrite the target if it already exists
 270       *
 271       * @throws IOException When target file or directory already exists
 272       * @throws IOException When origin cannot be renamed
 273       */
 274      public function rename($origin, $target, $overwrite = false)
 275      {
 276          // we check that target does not exist
 277          if (!$overwrite && $this->isReadable($target)) {
 278              throw new IOException(sprintf('Cannot rename because the target "%s" already exists.', $target), 0, null, $target);
 279          }
 280  
 281          if (true !== @rename($origin, $target)) {
 282              if (is_dir($origin)) {
 283                  // See https://bugs.php.net/bug.php?id=54097 & http://php.net/manual/en/function.rename.php#113943
 284                  $this->mirror($origin, $target, null, array('override' => $overwrite, 'delete' => $overwrite));
 285                  $this->remove($origin);
 286  
 287                  return;
 288              }
 289              throw new IOException(sprintf('Cannot rename "%s" to "%s".', $origin, $target), 0, null, $target);
 290          }
 291      }
 292  
 293      /**
 294       * Tells whether a file exists and is readable.
 295       *
 296       * @param string $filename Path to the file
 297       *
 298       * @return bool
 299       *
 300       * @throws IOException When windows path is longer than 258 characters
 301       */
 302      private function isReadable($filename)
 303      {
 304          $maxPathLength = PHP_MAXPATHLEN - 2;
 305  
 306          if (\strlen($filename) > $maxPathLength) {
 307              throw new IOException(sprintf('Could not check if file is readable because path length exceeds %d characters.', $maxPathLength), 0, null, $filename);
 308          }
 309  
 310          return is_readable($filename);
 311      }
 312  
 313      /**
 314       * Creates a symbolic link or copy a directory.
 315       *
 316       * @param string $originDir     The origin directory path
 317       * @param string $targetDir     The symbolic link name
 318       * @param bool   $copyOnWindows Whether to copy files if on Windows
 319       *
 320       * @throws IOException When symlink fails
 321       */
 322      public function symlink($originDir, $targetDir, $copyOnWindows = false)
 323      {
 324          if ('\\' === \DIRECTORY_SEPARATOR) {
 325              $originDir = strtr($originDir, '/', '\\');
 326              $targetDir = strtr($targetDir, '/', '\\');
 327  
 328              if ($copyOnWindows) {
 329                  $this->mirror($originDir, $targetDir);
 330  
 331                  return;
 332              }
 333          }
 334  
 335          $this->mkdir(\dirname($targetDir));
 336  
 337          if (is_link($targetDir)) {
 338              if (readlink($targetDir) === $originDir) {
 339                  return;
 340              }
 341              $this->remove($targetDir);
 342          }
 343  
 344          if (!self::box('symlink', $originDir, $targetDir)) {
 345              if (null !== self::$lastError) {
 346                  if ('\\' === \DIRECTORY_SEPARATOR && false !== strpos(self::$lastError, 'error code(1314)')) {
 347                      throw new IOException('Unable to create symlink due to error code 1314: \'A required privilege is not held by the client\'. Do you have the required Administrator-rights?', 0, null, $targetDir);
 348                  }
 349              }
 350              throw new IOException(sprintf('Failed to create symbolic link from "%s" to "%s".', $originDir, $targetDir), 0, null, $targetDir);
 351          }
 352      }
 353  
 354      /**
 355       * Given an existing path, convert it to a path relative to a given starting path.
 356       *
 357       * @param string $endPath   Absolute path of target
 358       * @param string $startPath Absolute path where traversal begins
 359       *
 360       * @return string Path of target relative to starting path
 361       */
 362      public function makePathRelative($endPath, $startPath)
 363      {
 364          // Normalize separators on Windows
 365          if ('\\' === \DIRECTORY_SEPARATOR) {
 366              $endPath = str_replace('\\', '/', $endPath);
 367              $startPath = str_replace('\\', '/', $startPath);
 368          }
 369  
 370          $stripDriveLetter = function ($path) {
 371              if (\strlen($path) > 2 && ':' === $path[1] && '/' === $path[2] && ctype_alpha($path[0])) {
 372                  return substr($path, 2);
 373              }
 374  
 375              return $path;
 376          };
 377  
 378          $endPath = $stripDriveLetter($endPath);
 379          $startPath = $stripDriveLetter($startPath);
 380  
 381          // Split the paths into arrays
 382          $startPathArr = explode('/', trim($startPath, '/'));
 383          $endPathArr = explode('/', trim($endPath, '/'));
 384  
 385          $normalizePathArray = function ($pathSegments, $absolute) {
 386              $result = array();
 387  
 388              foreach ($pathSegments as $segment) {
 389                  if ('..' === $segment && ($absolute || \count($result))) {
 390                      array_pop($result);
 391                  } elseif ('.' !== $segment) {
 392                      $result[] = $segment;
 393                  }
 394              }
 395  
 396              return $result;
 397          };
 398  
 399          $startPathArr = $normalizePathArray($startPathArr, static::isAbsolutePath($startPath));
 400          $endPathArr = $normalizePathArray($endPathArr, static::isAbsolutePath($endPath));
 401  
 402          // Find for which directory the common path stops
 403          $index = 0;
 404          while (isset($startPathArr[$index]) && isset($endPathArr[$index]) && $startPathArr[$index] === $endPathArr[$index]) {
 405              ++$index;
 406          }
 407  
 408          // Determine how deep the start path is relative to the common path (ie, "web/bundles" = 2 levels)
 409          if (1 === \count($startPathArr) && '' === $startPathArr[0]) {
 410              $depth = 0;
 411          } else {
 412              $depth = \count($startPathArr) - $index;
 413          }
 414  
 415          // Repeated "../" for each level need to reach the common path
 416          $traverser = str_repeat('../', $depth);
 417  
 418          $endPathRemainder = implode('/', \array_slice($endPathArr, $index));
 419  
 420          // Construct $endPath from traversing to the common path, then to the remaining $endPath
 421          $relativePath = $traverser.('' !== $endPathRemainder ? $endPathRemainder.'/' : '');
 422  
 423          return '' === $relativePath ? './' : $relativePath;
 424      }
 425  
 426      /**
 427       * Mirrors a directory to another.
 428       *
 429       * Copies files and directories from the origin directory into the target directory. By default:
 430       *
 431       *  - existing files in the target directory will be overwritten, except if they are newer (see the `override` option)
 432       *  - files in the target directory that do not exist in the source directory will not be deleted (see the `delete` option)
 433       *
 434       * @param string       $originDir The origin directory
 435       * @param string       $targetDir The target directory
 436       * @param \Traversable $iterator  Iterator that filters which files and directories to copy
 437       * @param array        $options   An array of boolean options
 438       *                                Valid options are:
 439       *                                - $options['override'] If true, target files newer than origin files are overwritten (see copy(), defaults to false)
 440       *                                - $options['copy_on_windows'] Whether to copy files instead of links on Windows (see symlink(), defaults to false)
 441       *                                - $options['delete'] Whether to delete files that are not in the source directory (defaults to false)
 442       *
 443       * @throws IOException When file type is unknown
 444       */
 445      public function mirror($originDir, $targetDir, \Traversable $iterator = null, $options = array())
 446      {
 447          $targetDir = rtrim($targetDir, '/\\');
 448          $originDir = rtrim($originDir, '/\\');
 449          $originDirLen = \strlen($originDir);
 450  
 451          // Iterate in destination folder to remove obsolete entries
 452          if ($this->exists($targetDir) && isset($options['delete']) && $options['delete']) {
 453              $deleteIterator = $iterator;
 454              if (null === $deleteIterator) {
 455                  $flags = \FilesystemIterator::SKIP_DOTS;
 456                  $deleteIterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($targetDir, $flags), \RecursiveIteratorIterator::CHILD_FIRST);
 457              }
 458              $targetDirLen = \strlen($targetDir);
 459              foreach ($deleteIterator as $file) {
 460                  $origin = $originDir.substr($file->getPathname(), $targetDirLen);
 461                  if (!$this->exists($origin)) {
 462                      $this->remove($file);
 463                  }
 464              }
 465          }
 466  
 467          $copyOnWindows = false;
 468          if (isset($options['copy_on_windows'])) {
 469              $copyOnWindows = $options['copy_on_windows'];
 470          }
 471  
 472          if (null === $iterator) {
 473              $flags = $copyOnWindows ? \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS : \FilesystemIterator::SKIP_DOTS;
 474              $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($originDir, $flags), \RecursiveIteratorIterator::SELF_FIRST);
 475          }
 476  
 477          if ($this->exists($originDir)) {
 478              $this->mkdir($targetDir);
 479          }
 480  
 481          foreach ($iterator as $file) {
 482              $target = $targetDir.substr($file->getPathname(), $originDirLen);
 483  
 484              if ($copyOnWindows) {
 485                  if (is_file($file)) {
 486                      $this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
 487                  } elseif (is_dir($file)) {
 488                      $this->mkdir($target);
 489                  } else {
 490                      throw new IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
 491                  }
 492              } else {
 493                  if (is_link($file)) {
 494                      $this->symlink($file->getLinkTarget(), $target);
 495                  } elseif (is_dir($file)) {
 496                      $this->mkdir($target);
 497                  } elseif (is_file($file)) {
 498                      $this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
 499                  } else {
 500                      throw new IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
 501                  }
 502              }
 503          }
 504      }
 505  
 506      /**
 507       * Returns whether the file path is an absolute path.
 508       *
 509       * @param string $file A file path
 510       *
 511       * @return bool
 512       */
 513      public function isAbsolutePath($file)
 514      {
 515          return strspn($file, '/\\', 0, 1)
 516              || (\strlen($file) > 3 && ctype_alpha($file[0])
 517                  && ':' === substr($file, 1, 1)
 518                  && strspn($file, '/\\', 2, 1)
 519              )
 520              || null !== parse_url($file, PHP_URL_SCHEME)
 521          ;
 522      }
 523  
 524      /**
 525       * Creates a temporary file with support for custom stream wrappers.
 526       *
 527       * @param string $dir    The directory where the temporary filename will be created
 528       * @param string $prefix The prefix of the generated temporary filename
 529       *                       Note: Windows uses only the first three characters of prefix
 530       *
 531       * @return string The new temporary filename (with path), or throw an exception on failure
 532       */
 533      public function tempnam($dir, $prefix)
 534      {
 535          list($scheme, $hierarchy) = $this->getSchemeAndHierarchy($dir);
 536  
 537          // If no scheme or scheme is "file" or "gs" (Google Cloud) create temp file in local filesystem
 538          if (null === $scheme || 'file' === $scheme || 'gs' === $scheme) {
 539              $tmpFile = @tempnam($hierarchy, $prefix);
 540  
 541              // If tempnam failed or no scheme return the filename otherwise prepend the scheme
 542              if (false !== $tmpFile) {
 543                  if (null !== $scheme && 'gs' !== $scheme) {
 544                      return $scheme.'://'.$tmpFile;
 545                  }
 546  
 547                  return $tmpFile;
 548              }
 549  
 550              throw new IOException('A temporary file could not be created.');
 551          }
 552  
 553          // Loop until we create a valid temp file or have reached 10 attempts
 554          for ($i = 0; $i < 10; ++$i) {
 555              // Create a unique filename
 556              $tmpFile = $dir.'/'.$prefix.uniqid(mt_rand(), true);
 557  
 558              // Use fopen instead of file_exists as some streams do not support stat
 559              // Use mode 'x+' to atomically check existence and create to avoid a TOCTOU vulnerability
 560              $handle = @fopen($tmpFile, 'x+');
 561  
 562              // If unsuccessful restart the loop
 563              if (false === $handle) {
 564                  continue;
 565              }
 566  
 567              // Close the file if it was successfully opened
 568              @fclose($handle);
 569  
 570              return $tmpFile;
 571          }
 572  
 573          throw new IOException('A temporary file could not be created.');
 574      }
 575  
 576      /**
 577       * Atomically dumps content into a file.
 578       *
 579       * @param string   $filename The file to be written to
 580       * @param string   $content  The data to write into the file
 581       * @param int|null $mode     The file mode (octal). If null, file permissions are not modified
 582       *                           Deprecated since version 2.3.12, to be removed in 3.0.
 583       *
 584       * @throws IOException if the file cannot be written to
 585       */
 586      public function dumpFile($filename, $content, $mode = 0666)
 587      {
 588          $dir = \dirname($filename);
 589  
 590          if (!is_dir($dir)) {
 591              $this->mkdir($dir);
 592          }
 593  
 594          if (!is_writable($dir)) {
 595              throw new IOException(sprintf('Unable to write to the "%s" directory.', $dir), 0, null, $dir);
 596          }
 597  
 598          $tmpFile = $this->tempnam($dir, basename($filename));
 599  
 600          if (false === @file_put_contents($tmpFile, $content)) {
 601              throw new IOException(sprintf('Failed to write file "%s".', $filename), 0, null, $filename);
 602          }
 603  
 604          if (null !== $mode) {
 605              if (\func_num_args() > 2) {
 606                  @trigger_error('Support for modifying file permissions is deprecated since Symfony 2.3.12 and will be removed in 3.0.', E_USER_DEPRECATED);
 607              }
 608  
 609              $this->chmod($tmpFile, $mode);
 610          } elseif (file_exists($filename)) {
 611              @chmod($tmpFile, fileperms($filename));
 612          }
 613  
 614          $this->rename($tmpFile, $filename, true);
 615      }
 616  
 617      /**
 618       * @param mixed $files
 619       *
 620       * @return \Traversable
 621       */
 622      private function toIterator($files)
 623      {
 624          if (!$files instanceof \Traversable) {
 625              $files = new \ArrayObject(\is_array($files) ? $files : array($files));
 626          }
 627  
 628          return $files;
 629      }
 630  
 631      /**
 632       * Gets a 2-tuple of scheme (may be null) and hierarchical part of a filename (e.g. file:///tmp -> array(file, tmp)).
 633       *
 634       * @param string $filename The filename to be parsed
 635       *
 636       * @return array The filename scheme and hierarchical part
 637       */
 638      private function getSchemeAndHierarchy($filename)
 639      {
 640          $components = explode('://', $filename, 2);
 641  
 642          return 2 === \count($components) ? array($components[0], $components[1]) : array(null, $components[0]);
 643      }
 644  
 645      private static function box($func)
 646      {
 647          self::$lastError = null;
 648          \set_error_handler(__CLASS__.'::handleError');
 649          try {
 650              $result = \call_user_func_array($func, \array_slice(\func_get_args(), 1));
 651              \restore_error_handler();
 652  
 653              return $result;
 654          } catch (\Throwable $e) {
 655          } catch (\Exception $e) {
 656          }
 657          \restore_error_handler();
 658  
 659          throw $e;
 660      }
 661  
 662      /**
 663       * @internal
 664       */
 665      public static function handleError($type, $msg)
 666      {
 667          self::$lastError = $msg;
 668      }
 669  }