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 * @see    https://www.php-fig.org/psr/psr-0/
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 * @see    https://www.php-fig.org/psr/psr-0/
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 * @see    https://www.php-fig.org/psr/psr-4/
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 * @see    https://www.php-fig.org/psr/psr-4/
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 */
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 */
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class ClassLoader
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class ClassLoader
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{
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{
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    /** @var \Closure(string):void */
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    private static $includeFile;
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    /** @var ?string */
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    /** @var ?string */
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    private $vendorDir;
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    private $vendorDir;
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    // PSR-4
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    // PSR-4
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    /**
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    /**
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     * @param ?string $vendorDir
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     * @param ?string $vendorDir
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     */
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     */
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    public function __construct($vendorDir = null)
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    public function __construct($vendorDir = null)
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    {
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    {
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        $this->vendorDir = $vendorDir;
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        $this->vendorDir = $vendorDir;
- 
 
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        self::initializeIncludeClosure();
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    }
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    }
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    /**
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    /**
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     * @return string[]
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     * @return string[]
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     */
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     */
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     * @return true|null True if loaded, null otherwise
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     * @return true|null True if loaded, null otherwise
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     */
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     */
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    public function loadClass($class)
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    public function loadClass($class)
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    {
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    {
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        if ($file = $this->findFile($class)) {
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        if ($file = $this->findFile($class)) {
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            $includeFile = self::$includeFile;
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            includeFile($file);
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            $includeFile($file);
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            return true;
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            return true;
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        }
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        }
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        return null;
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        return null;
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            return $file;
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            return $file;
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        }
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        }
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        return false;
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        return false;
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    }
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    }
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    /**
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     * @return void
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     */
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    private static function initializeIncludeClosure()
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    {
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        if (self::$includeFile !== null) {
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            return;
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}
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        }
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/**
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        /**
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 * Scope isolated include.
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         * Scope isolated include.
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 *
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         *
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 * Prevents access to $this/self from included files.
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         * Prevents access to $this/self from included files.
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 *
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         *
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 * @param  string $file
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         * @param  string $file
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 * @return void
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         * @return void
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 * @private
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 */
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         */
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function includeFile($file)
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        self::$includeFile = \Closure::bind(static function($file) {
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{
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    include $file;
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            include $file;
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        }, null, null);
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    }
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}
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}