<?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
{

>     /** @var ?string */
    // PSR-4
>     private $vendorDir;
    private $prefixLengthsPsr4 = array();
> 


    private $prefixDirsPsr4 = array();

>     /**
    private $fallbackDirsPsr4 = array();
>      * @var array[]

>      * @psalm-var array<string, array<string, int>>
    // PSR-0
>      */


    private $prefixesPsr0 = array();

>     /**
    private $fallbackDirsPsr0 = array();
>      * @var array[]

>      * @psalm-var array<string, array<int, string>>
    private $useIncludePath = false;
>      */


    private $classMap = array();

>     /**
    private $classMapAuthoritative = false;
>      * @var array[]
    private $missingClasses = array();
>      * @psalm-var array<string, string>
    private $apcuPrefix;
>      */




>     /**
    public function getPrefixes()
>      * @var array[]
    {
>      * @psalm-var array<string, array<string, string[]>>
        if (!empty($this->prefixesPsr0)) {
>      */


            return call_user_func_array('array_merge', array_values($this->prefixesPsr0));

>     /**
        }
>      * @var array[]

>      * @psalm-var array<string, string>
        return array();
>      */


    }

>     /** @var bool */




> 
    public function getPrefixesPsr4()
>     /**
    {
>      * @var string[]
        return $this->prefixDirsPsr4;
>      * @psalm-var array<string, string>
    }
>      */




> 
    public function getFallbackDirs()
>     /** @var bool */


    {

> 
        return $this->fallbackDirsPsr0;
>     /**
    }
>      * @var bool[]

>      * @psalm-var array<string, bool>
    public function getFallbackDirsPsr4()
>      */


    {

> 
        return $this->fallbackDirsPsr4;
>     /** @var ?string */


    }

>     /**

>      * @var self[]
    public function getClassMap()
>      */
    {
>     private static $registeredLoaders = array();
        return $this->classMap;
> 
    }
>     /**

>      * @param ?string $vendorDir
    /**
>      */
     * @param array $classMap Class to filename map
>     public function __construct($vendorDir = null)
     */
>     {
    public function addClassMap(array $classMap)
>         $this->vendorDir = $vendorDir;
    {
>     }
        if ($this->classMap) {
> 
            $this->classMap = array_merge($this->classMap, $classMap);
>     /**
        } else {
>      * @return string[]
            $this->classMap = $classMap;
>      */


        }

>     /**
    }
>      * @return array[]

>      * @psalm-return array<string, array<int, string>>
    /**
>      */


     * Registers a set of PSR-0 directories for a given prefix, either

>     /**
     * appending or prepending to the ones previously set for this prefix.
>      * @return array[]
     *
>      * @psalm-return array<string, string>
     * @param string       $prefix  The prefix
>      */


     * @param array|string $paths   The PSR-0 root directories

>     /**
     * @param bool         $prepend Whether to prepend the directories
>      * @return array[]
     */
>      * @psalm-return array<string, string>
    public function add($prefix, $paths, $prepend = false)
>      */


    {

>     /**
        if (!$prefix) {
>      * @return string[] Array of classname => path
            if ($prepend) {
>      * @psalm-return array<string, string>
                $this->fallbackDirsPsr0 = array_merge(
>      */



<      * @param array $classMap Class to filename map



>      * @param string[] $classMap Class to filename map
>      * @psalm-param array<string, string> $classMap
>      *
>      * @return void



<      * @param array|string $paths   The PSR-0 root directories



>      * @param string[]|string $paths   The PSR-0 root directories


                );

>      *
            } else {
>      * @return void


                $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 string[]|string $paths   The PSR-4 base directories


     * @param bool         $prepend Whether to prepend the directories
     *
     * @throws \InvalidArgumentException

>      *
     */
>      * @return void


    public function addPsr4($prefix, $paths, $prepend = false)
    {
        if (!$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



>      * @param string[]|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 array|string $paths  The PSR-4 base directories



>      * @param string[]|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;
    /**
>         }
     * Unregisters this instance as an autoloader.
> 
     */
>         if ($prepend) {
    public function unregister()
>             self::$registeredLoaders = array($this->vendorDir => $this) + self::$registeredLoaders;
    {
>         } else {
        spl_autoload_unregister(array($this, 'loadClass'));
>             unset(self::$registeredLoaders[$this->vendorDir]);
    }
>             self::$registeredLoaders[$this->vendorDir] = $this;

>         }


    /**

>      *
     * Loads the given class or interface.
>      * @return void


     *

> 
     * @param  string    $class The name of the class
>         if (null !== $this->vendorDir) {
     * @return bool|null True if loaded, null otherwise
>             unset(self::$registeredLoaders[$this->vendorDir]);
     */
>         }



<      * @return bool|null True if loaded, null otherwise



>      * @return true|null True if loaded, null otherwise


    {
        if ($file = $this->findFile($class)) {
            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;
    }


>     /**
    private function findFileWithExtension($class, $ext)
>      * Returns the currently registered loaders indexed by their corresponding vendor directories.
    {
>      *
        // PSR-4 lookup
>      * @return self[]
        $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
>      */

>     public static function getRegisteredLoaders()
        $first = $class[0];
>     {
        if (isset($this->prefixLengthsPsr4[$first])) {
>         return self::$registeredLoaders;
            $subPath = $class;
>     }
            while (false !== $lastPos = strrpos($subPath, '\\')) {
> 
                $subPath = substr($subPath, 0, $lastPos);
>     /**
                $search = $subPath . '\\';
>      * @param  string       $class
                if (isset($this->prefixDirsPsr4[$search])) {
>      * @param  string       $ext
                    $pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
>      * @return string|false
                    foreach ($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.

>  *
 */
>  * @param  string $file
function includeFile($file)
>  * @return void
{
>  * @private


    include $file;
}