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<?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\Filesystem;

use
Symfony\Component\Filesystem\Exception\FileNotFoundException;
use
Symfony\Component\Filesystem\Exception\IOException;

/**
 * Provides basic utility to manipulate the file system.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Filesystem
{
    private static
$lastError;

   
/**
     * Copies a file.
     *
     * If the target file is older than the origin file, it's always overwritten.
     * If the target file is newer, it is overwritten only when the
     * $overwriteNewerFiles option is set to true.
     *
     * @param string $originFile          The original filename
     * @param string $targetFile          The target filename
     * @param bool   $overwriteNewerFiles If true, target files newer than origin files are overwritten
     *
     * @throws FileNotFoundException When originFile doesn't exist
     * @throws IOException           When copy fails
     */
   
public function copy($originFile, $targetFile, $overwriteNewerFiles = false)
    {
       
$originIsLocal = stream_is_local($originFile) || 0 === stripos($originFile, 'file://');
        if (
$originIsLocal && !is_file($originFile)) {
            throw new
FileNotFoundException(sprintf('Failed to copy "%s" because file does not exist.', $originFile), 0, null, $originFile);
        }

       
$this->mkdir(\dirname($targetFile));

       
$doCopy = true;
        if (!
$overwriteNewerFiles && null === parse_url($originFile, \PHP_URL_HOST) && is_file($targetFile)) {
           
$doCopy = filemtime($originFile) > filemtime($targetFile);
        }

        if (
$doCopy) {
           
// https://bugs.php.net/64634
           
if (false === $source = @fopen($originFile, 'r')) {
                throw new
IOException(sprintf('Failed to copy "%s" to "%s" because source file could not be opened for reading.', $originFile, $targetFile), 0, null, $originFile);
            }

           
// Stream context created to allow files overwrite when using FTP stream wrapper - disabled by default
           
if (false === $target = @fopen($targetFile, 'w', null, stream_context_create(['ftp' => ['overwrite' => true]]))) {
                throw new
IOException(sprintf('Failed to copy "%s" to "%s" because target file could not be opened for writing.', $originFile, $targetFile), 0, null, $originFile);
            }

           
$bytesCopied = stream_copy_to_stream($source, $target);
           
fclose($source);
           
fclose($target);
            unset(
$source, $target);

            if (!
is_file($targetFile)) {
                throw new
IOException(sprintf('Failed to copy "%s" to "%s".', $originFile, $targetFile), 0, null, $originFile);
            }

            if (
$originIsLocal) {
               
// Like `cp`, preserve executable permission bits
               
@chmod($targetFile, fileperms($targetFile) | (fileperms($originFile) & 0111));

                if (
$bytesCopied !== $bytesOrigin = filesize($originFile)) {
                    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);
                }
            }
        }
    }

   
/**
     * Creates a directory recursively.
     *
     * @param string|iterable $dirs The directory path
     * @param int             $mode The directory mode
     *
     * @throws IOException On any directory creation failure
     */
   
public function mkdir($dirs, $mode = 0777)
    {
        foreach (
$this->toIterable($dirs) as $dir) {
            if (
is_dir($dir)) {
                continue;
            }

            if (!
self::box('mkdir', $dir, $mode, true)) {
                if (!
is_dir($dir)) {
                   
// The directory was not created by a concurrent process. Let's throw an exception with a developer friendly error message if we have one
                   
if (self::$lastError) {
                        throw new
IOException(sprintf('Failed to create "%s": ', $dir).self::$lastError, 0, null, $dir);
                    }
                    throw new
IOException(sprintf('Failed to create "%s".', $dir), 0, null, $dir);
                }
            }
        }
    }

   
/**
     * Checks the existence of files or directories.
     *
     * @param string|iterable $files A filename, an array of files, or a \Traversable instance to check
     *
     * @return bool true if the file exists, false otherwise
     */
   
public function exists($files)
    {
       
$maxPathLength = \PHP_MAXPATHLEN - 2;

        foreach (
$this->toIterable($files) as $file) {
            if (\
strlen($file) > $maxPathLength) {
                throw new
IOException(sprintf('Could not check if file exist because path length exceeds %d characters.', $maxPathLength), 0, null, $file);
            }

            if (!
file_exists($file)) {
                return
false;
            }
        }

        return
true;
    }

   
/**
     * Sets access and modification time of file.
     *
     * @param string|iterable $files A filename, an array of files, or a \Traversable instance to create
     * @param int|null        $time  The touch time as a Unix timestamp, if not supplied the current system time is used
     * @param int|null        $atime The access time as a Unix timestamp, if not supplied the current system time is used
     *
     * @throws IOException When touch fails
     */
   
public function touch($files, $time = null, $atime = null)
    {
        foreach (
$this->toIterable($files) as $file) {
           
$touch = $time ? @touch($file, $time, $atime) : @touch($file);
            if (
true !== $touch) {
                throw new
IOException(sprintf('Failed to touch "%s".', $file), 0, null, $file);
            }
        }
    }

   
/**
     * Removes files or directories.
     *
     * @param string|iterable $files A filename, an array of files, or a \Traversable instance to remove
     *
     * @throws IOException When removal fails
     */
   
public function remove($files)
    {
        if (
$files instanceof \Traversable) {
           
$files = iterator_to_array($files, false);
        } elseif (!\
is_array($files)) {
           
$files = [$files];
        }
       
$files = array_reverse($files);
        foreach (
$files as $file) {
            if (
is_link($file)) {
               
// See https://bugs.php.net/52176
               
if (!(self::box('unlink', $file) || '\\' !== \DIRECTORY_SEPARATOR || self::box('rmdir', $file)) && file_exists($file)) {
                    throw new
IOException(sprintf('Failed to remove symlink "%s": ', $file).self::$lastError);
                }
            } elseif (
is_dir($file)) {
               
$this->remove(new \FilesystemIterator($file, \FilesystemIterator::CURRENT_AS_PATHNAME | \FilesystemIterator::SKIP_DOTS));

                if (!
self::box('rmdir', $file) && file_exists($file)) {
                    throw new
IOException(sprintf('Failed to remove directory "%s": ', $file).self::$lastError);
                }
            } elseif (!
self::box('unlink', $file) && (false !== strpos(self::$lastError, 'Permission denied') || file_exists($file))) {
                throw new
IOException(sprintf('Failed to remove file "%s": ', $file).self::$lastError);
            }
        }
    }

   
/**
     * Change mode for an array of files or directories.
     *
     * @param string|iterable $files     A filename, an array of files, or a \Traversable instance to change mode
     * @param int             $mode      The new mode (octal)
     * @param int             $umask     The mode mask (octal)
     * @param bool            $recursive Whether change the mod recursively or not
     *
     * @throws IOException When the change fails
     */
   
public function chmod($files, $mode, $umask = 0000, $recursive = false)
    {
        foreach (
$this->toIterable($files) as $file) {
            if ((\
PHP_VERSION_ID < 80000 || \is_int($mode)) && true !== @chmod($file, $mode & ~$umask)) {
                throw new
IOException(sprintf('Failed to chmod file "%s".', $file), 0, null, $file);
            }
            if (
$recursive && is_dir($file) && !is_link($file)) {
               
$this->chmod(new \FilesystemIterator($file), $mode, $umask, true);
            }
        }
    }

   
/**
     * Change the owner of an array of files or directories.
     *
     * @param string|iterable $files     A filename, an array of files, or a \Traversable instance to change owner
     * @param string|int      $user      A user name or number
     * @param bool            $recursive Whether change the owner recursively or not
     *
     * @throws IOException When the change fails
     */
   
public function chown($files, $user, $recursive = false)
    {
        foreach (
$this->toIterable($files) as $file) {
            if (
$recursive && is_dir($file) && !is_link($file)) {
               
$this->chown(new \FilesystemIterator($file), $user, true);
            }
            if (
is_link($file) && \function_exists('lchown')) {
                if (
true !== @lchown($file, $user)) {
                    throw new
IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
                }
            } else {
                if (
true !== @chown($file, $user)) {
                    throw new
IOException(sprintf('Failed to chown file "%s".', $file), 0, null, $file);
                }
            }
        }
    }

   
/**
     * Change the group of an array of files or directories.
     *
     * @param string|iterable $files     A filename, an array of files, or a \Traversable instance to change group
     * @param string|int      $group     A group name or number
     * @param bool            $recursive Whether change the group recursively or not
     *
     * @throws IOException When the change fails
     */
   
public function chgrp($files, $group, $recursive = false)
    {
        foreach (
$this->toIterable($files) as $file) {
            if (
$recursive && is_dir($file) && !is_link($file)) {
               
$this->chgrp(new \FilesystemIterator($file), $group, true);
            }
            if (
is_link($file) && \function_exists('lchgrp')) {
                if (
true !== @lchgrp($file, $group) || (\defined('HHVM_VERSION') && !posix_getgrnam($group))) {
                    throw new
IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
                }
            } else {
                if (
true !== @chgrp($file, $group)) {
                    throw new
IOException(sprintf('Failed to chgrp file "%s".', $file), 0, null, $file);
                }
            }
        }
    }

   
/**
     * Renames a file or a directory.
     *
     * @param string $origin    The origin filename or directory
     * @param string $target    The new filename or directory
     * @param bool   $overwrite Whether to overwrite the target if it already exists
     *
     * @throws IOException When target file or directory already exists
     * @throws IOException When origin cannot be renamed
     */
   
public function rename($origin, $target, $overwrite = false)
    {
       
// we check that target does not exist
       
if (!$overwrite && $this->isReadable($target)) {
            throw new
IOException(sprintf('Cannot rename because the target "%s" already exists.', $target), 0, null, $target);
        }

        if (
true !== @rename($origin, $target)) {
            if (
is_dir($origin)) {
               
// See https://bugs.php.net/54097 & https://php.net/rename#113943
               
$this->mirror($origin, $target, null, ['override' => $overwrite, 'delete' => $overwrite]);
               
$this->remove($origin);

                return;
            }
            throw new
IOException(sprintf('Cannot rename "%s" to "%s".', $origin, $target), 0, null, $target);
        }
    }

   
/**
     * Tells whether a file exists and is readable.
     *
     * @param string $filename Path to the file
     *
     * @return bool
     *
     * @throws IOException When windows path is longer than 258 characters
     */
   
private function isReadable($filename)
    {
       
$maxPathLength = \PHP_MAXPATHLEN - 2;

        if (\
strlen($filename) > $maxPathLength) {
            throw new
IOException(sprintf('Could not check if file is readable because path length exceeds %d characters.', $maxPathLength), 0, null, $filename);
        }

        return
is_readable($filename);
    }

   
/**
     * Creates a symbolic link or copy a directory.
     *
     * @param string $originDir     The origin directory path
     * @param string $targetDir     The symbolic link name
     * @param bool   $copyOnWindows Whether to copy files if on Windows
     *
     * @throws IOException When symlink fails
     */
   
public function symlink($originDir, $targetDir, $copyOnWindows = false)
    {
        if (
'\\' === \DIRECTORY_SEPARATOR) {
           
$originDir = strtr($originDir, '/', '\\');
           
$targetDir = strtr($targetDir, '/', '\\');

            if (
$copyOnWindows) {
               
$this->mirror($originDir, $targetDir);

                return;
            }
        }

       
$this->mkdir(\dirname($targetDir));

        if (
is_link($targetDir)) {
            if (
readlink($targetDir) === $originDir) {
                return;
            }
           
$this->remove($targetDir);
        }

        if (!
self::box('symlink', $originDir, $targetDir)) {
           
$this->linkException($originDir, $targetDir, 'symbolic');
        }
    }

   
/**
     * Creates a hard link, or several hard links to a file.
     *
     * @param string          $originFile  The original file
     * @param string|string[] $targetFiles The target file(s)
     *
     * @throws FileNotFoundException When original file is missing or not a file
     * @throws IOException           When link fails, including if link already exists
     */
   
public function hardlink($originFile, $targetFiles)
    {
        if (!
$this->exists($originFile)) {
            throw new
FileNotFoundException(null, 0, null, $originFile);
        }

        if (!
is_file($originFile)) {
            throw new
FileNotFoundException(sprintf('Origin file "%s" is not a file.', $originFile));
        }

        foreach (
$this->toIterable($targetFiles) as $targetFile) {
            if (
is_file($targetFile)) {
                if (
fileinode($originFile) === fileinode($targetFile)) {
                    continue;
                }
               
$this->remove($targetFile);
            }

            if (!
self::box('link', $originFile, $targetFile)) {
               
$this->linkException($originFile, $targetFile, 'hard');
            }
        }
    }

   
/**
     * @param string $origin
     * @param string $target
     * @param string $linkType Name of the link type, typically 'symbolic' or 'hard'
     */
   
private function linkException($origin, $target, $linkType)
    {
        if (
self::$lastError) {
            if (
'\\' === \DIRECTORY_SEPARATOR && false !== strpos(self::$lastError, 'error code(1314)')) {
                throw new
IOException(sprintf('Unable to create "%s" link due to error code 1314: \'A required privilege is not held by the client\'. Do you have the required Administrator-rights?', $linkType), 0, null, $target);
            }
        }
        throw new
IOException(sprintf('Failed to create "%s" link from "%s" to "%s".', $linkType, $origin, $target), 0, null, $target);
    }

   
/**
     * Resolves links in paths.
     *
     * With $canonicalize = false (default)
     *      - if $path does not exist or is not a link, returns null
     *      - if $path is a link, returns the next direct target of the link without considering the existence of the target
     *
     * With $canonicalize = true
     *      - if $path does not exist, returns null
     *      - if $path exists, returns its absolute fully resolved final version
     *
     * @param string $path         A filesystem path
     * @param bool   $canonicalize Whether or not to return a canonicalized path
     *
     * @return string|null
     */
   
public function readlink($path, $canonicalize = false)
    {
        if (!
$canonicalize && !is_link($path)) {
            return
null;
        }

        if (
$canonicalize) {
            if (!
$this->exists($path)) {
                return
null;
            }

            if (
'\\' === \DIRECTORY_SEPARATOR) {
               
$path = readlink($path);
            }

            return
realpath($path);
        }

        if (
'\\' === \DIRECTORY_SEPARATOR) {
            return
realpath($path);
        }

        return
readlink($path);
    }

   
/**
     * Given an existing path, convert it to a path relative to a given starting path.
     *
     * @param string $endPath   Absolute path of target
     * @param string $startPath Absolute path where traversal begins
     *
     * @return string Path of target relative to starting path
     */
   
public function makePathRelative($endPath, $startPath)
    {
        if (!
$this->isAbsolutePath($endPath) || !$this->isAbsolutePath($startPath)) {
            @
trigger_error(sprintf('Support for passing relative paths to %s() is deprecated since Symfony 3.4 and will be removed in 4.0.', __METHOD__), \E_USER_DEPRECATED);
        }

       
// Normalize separators on Windows
       
if ('\\' === \DIRECTORY_SEPARATOR) {
           
$endPath = str_replace('\\', '/', $endPath);
           
$startPath = str_replace('\\', '/', $startPath);
        }

       
$splitDriveLetter = function ($path) {
            return (\
strlen($path) > 2 && ':' === $path[1] && '/' === $path[2] && ctype_alpha($path[0]))
                ? [
substr($path, 2), strtoupper($path[0])]
                : [
$path, null];
        };

       
$splitPath = function ($path, $absolute) {
           
$result = [];

            foreach (
explode('/', trim($path, '/')) as $segment) {
                if (
'..' === $segment && ($absolute || \count($result))) {
                   
array_pop($result);
                } elseif (
'.' !== $segment && '' !== $segment) {
                   
$result[] = $segment;
                }
            }

            return
$result;
        };

        list(
$endPath, $endDriveLetter) = $splitDriveLetter($endPath);
        list(
$startPath, $startDriveLetter) = $splitDriveLetter($startPath);

       
$startPathArr = $splitPath($startPath, static::isAbsolutePath($startPath));
       
$endPathArr = $splitPath($endPath, static::isAbsolutePath($endPath));

        if (
$endDriveLetter && $startDriveLetter && $endDriveLetter != $startDriveLetter) {
           
// End path is on another drive, so no relative path exists
           
return $endDriveLetter.':/'.($endPathArr ? implode('/', $endPathArr).'/' : '');
        }

       
// Find for which directory the common path stops
       
$index = 0;
        while (isset(
$startPathArr[$index]) && isset($endPathArr[$index]) && $startPathArr[$index] === $endPathArr[$index]) {
            ++
$index;
        }

       
// Determine how deep the start path is relative to the common path (ie, "web/bundles" = 2 levels)
       
if (1 === \count($startPathArr) && '' === $startPathArr[0]) {
           
$depth = 0;
        } else {
           
$depth = \count($startPathArr) - $index;
        }

       
// Repeated "../" for each level need to reach the common path
       
$traverser = str_repeat('../', $depth);

       
$endPathRemainder = implode('/', \array_slice($endPathArr, $index));

       
// Construct $endPath from traversing to the common path, then to the remaining $endPath
       
$relativePath = $traverser.('' !== $endPathRemainder ? $endPathRemainder.'/' : '');

        return
'' === $relativePath ? './' : $relativePath;
    }

   
/**
     * Mirrors a directory to another.
     *
     * Copies files and directories from the origin directory into the target directory. By default:
     *
     *  - existing files in the target directory will be overwritten, except if they are newer (see the `override` option)
     *  - files in the target directory that do not exist in the source directory will not be deleted (see the `delete` option)
     *
     * @param string            $originDir The origin directory
     * @param string            $targetDir The target directory
     * @param \Traversable|null $iterator  Iterator that filters which files and directories to copy, if null a recursive iterator is created
     * @param array             $options   An array of boolean options
     *                                     Valid options are:
     *                                     - $options['override'] If true, target files newer than origin files are overwritten (see copy(), defaults to false)
     *                                     - $options['copy_on_windows'] Whether to copy files instead of links on Windows (see symlink(), defaults to false)
     *                                     - $options['delete'] Whether to delete files that are not in the source directory (defaults to false)
     *
     * @throws IOException When file type is unknown
     */
   
public function mirror($originDir, $targetDir, \Traversable $iterator = null, $options = [])
    {
       
$targetDir = rtrim($targetDir, '/\\');
       
$originDir = rtrim($originDir, '/\\');
       
$originDirLen = \strlen($originDir);

       
// Iterate in destination folder to remove obsolete entries
       
if ($this->exists($targetDir) && isset($options['delete']) && $options['delete']) {
           
$deleteIterator = $iterator;
            if (
null === $deleteIterator) {
               
$flags = \FilesystemIterator::SKIP_DOTS;
               
$deleteIterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($targetDir, $flags), \RecursiveIteratorIterator::CHILD_FIRST);
            }
           
$targetDirLen = \strlen($targetDir);
            foreach (
$deleteIterator as $file) {
               
$origin = $originDir.substr($file->getPathname(), $targetDirLen);
                if (!
$this->exists($origin)) {
                   
$this->remove($file);
                }
            }
        }

       
$copyOnWindows = false;
        if (isset(
$options['copy_on_windows'])) {
           
$copyOnWindows = $options['copy_on_windows'];
        }

        if (
null === $iterator) {
           
$flags = $copyOnWindows ? \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS : \FilesystemIterator::SKIP_DOTS;
           
$iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($originDir, $flags), \RecursiveIteratorIterator::SELF_FIRST);
        }

        if (
$this->exists($originDir)) {
           
$this->mkdir($targetDir);
        }

        foreach (
$iterator as $file) {
           
$target = $targetDir.substr($file->getPathname(), $originDirLen);

            if (
$copyOnWindows) {
                if (
is_file($file)) {
                   
$this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
                } elseif (
is_dir($file)) {
                   
$this->mkdir($target);
                } else {
                    throw new
IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
                }
            } else {
                if (
is_link($file)) {
                   
$this->symlink($file->getLinkTarget(), $target);
                } elseif (
is_dir($file)) {
                   
$this->mkdir($target);
                } elseif (
is_file($file)) {
                   
$this->copy($file, $target, isset($options['override']) ? $options['override'] : false);
                } else {
                    throw new
IOException(sprintf('Unable to guess "%s" file type.', $file), 0, null, $file);
                }
            }
        }
    }

   
/**
     * Returns whether the file path is an absolute path.
     *
     * @param string $file A file path
     *
     * @return bool
     */
   
public function isAbsolutePath($file)
    {
        return
'' !== (string) $file && (strspn($file, '/\\', 0, 1)
            || (\
strlen($file) > 3 && ctype_alpha($file[0])
                &&
':' === $file[1]
                &&
strspn($file, '/\\', 2, 1)
            )
            ||
null !== parse_url($file, \PHP_URL_SCHEME)
        );
    }

   
/**
     * Creates a temporary file with support for custom stream wrappers.
     *
     * @param string $dir    The directory where the temporary filename will be created
     * @param string $prefix The prefix of the generated temporary filename
     *                       Note: Windows uses only the first three characters of prefix
     *
     * @return string The new temporary filename (with path), or throw an exception on failure
     */
   
public function tempnam($dir, $prefix)
    {
        list(
$scheme, $hierarchy) = $this->getSchemeAndHierarchy($dir);

       
// If no scheme or scheme is "file" or "gs" (Google Cloud) create temp file in local filesystem
       
if (null === $scheme || 'file' === $scheme || 'gs' === $scheme) {
           
$tmpFile = @tempnam($hierarchy, $prefix);

           
// If tempnam failed or no scheme return the filename otherwise prepend the scheme
           
if (false !== $tmpFile) {
                if (
null !== $scheme && 'gs' !== $scheme) {
                    return
$scheme.'://'.$tmpFile;
                }

                return
$tmpFile;
            }

            throw new
IOException('A temporary file could not be created.');
        }

       
// Loop until we create a valid temp file or have reached 10 attempts
       
for ($i = 0; $i < 10; ++$i) {
           
// Create a unique filename
           
$tmpFile = $dir.'/'.$prefix.uniqid(mt_rand(), true);

           
// Use fopen instead of file_exists as some streams do not support stat
            // Use mode 'x+' to atomically check existence and create to avoid a TOCTOU vulnerability
           
$handle = @fopen($tmpFile, 'x+');

           
// If unsuccessful restart the loop
           
if (false === $handle) {
                continue;
            }

           
// Close the file if it was successfully opened
           
@fclose($handle);

            return
$tmpFile;
        }

        throw new
IOException('A temporary file could not be created.');
    }

   
/**
     * Atomically dumps content into a file.
     *
     * @param string $filename The file to be written to
     * @param string $content  The data to write into the file
     *
     * @throws IOException if the file cannot be written to
     */
   
public function dumpFile($filename, $content)
    {
       
$dir = \dirname($filename);

        if (!
is_dir($dir)) {
           
$this->mkdir($dir);
        }

        if (!
is_writable($dir)) {
            throw new
IOException(sprintf('Unable to write to the "%s" directory.', $dir), 0, null, $dir);
        }

       
// Will create a temp file with 0600 access rights
        // when the filesystem supports chmod.
       
$tmpFile = $this->tempnam($dir, basename($filename));

        if (
false === @file_put_contents($tmpFile, $content)) {
            throw new
IOException(sprintf('Failed to write file "%s".', $filename), 0, null, $filename);
        }

        @
chmod($tmpFile, file_exists($filename) ? fileperms($filename) : 0666 & ~umask());

       
$this->rename($tmpFile, $filename, true);
    }

   
/**
     * Appends content to an existing file.
     *
     * @param string $filename The file to which to append content
     * @param string $content  The content to append
     *
     * @throws IOException If the file is not writable
     */
   
public function appendToFile($filename, $content)
    {
       
$dir = \dirname($filename);

        if (!
is_dir($dir)) {
           
$this->mkdir($dir);
        }

        if (!
is_writable($dir)) {
            throw new
IOException(sprintf('Unable to write to the "%s" directory.', $dir), 0, null, $dir);
        }

        if (
false === @file_put_contents($filename, $content, \FILE_APPEND)) {
            throw new
IOException(sprintf('Failed to write file "%s".', $filename), 0, null, $filename);
        }
    }

   
/**
     * @param mixed $files
     *
     * @return array|\Traversable
     */
   
private function toIterable($files)
    {
        return \
is_array($files) || $files instanceof \Traversable ? $files : [$files];
    }

   
/**
     * Gets a 2-tuple of scheme (may be null) and hierarchical part of a filename (e.g. file:///tmp -> [file, tmp]).
     *
     * @param string $filename The filename to be parsed
     *
     * @return array The filename scheme and hierarchical part
     */
   
private function getSchemeAndHierarchy($filename)
    {
       
$components = explode('://', $filename, 2);

        return
2 === \count($components) ? [$components[0], $components[1]] : [null, $components[0]];
    }

   
/**
     * @param callable $func
     *
     * @return mixed
     */
   
private static function box($func)
    {
       
self::$lastError = null;
       
set_error_handler(__CLASS__.'::handleError');
        try {
           
$result = \call_user_func_array($func, \array_slice(\func_get_args(), 1));
           
restore_error_handler();

            return
$result;
        } catch (\
Throwable $e) {
        } catch (\
Exception $e) {
        }
       
restore_error_handler();

        throw
$e;
    }

   
/**
     * @internal
     */
   
public static function handleError($type, $msg)
    {
       
self::$lastError = $msg;
    }
}