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<?php

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/**

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* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)

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* Licensed under The MIT License

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* Redistributions of files must retain the above copyright notice.

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* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)

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* @link https://cakephp.org CakePHP(tm) Project

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* @since 3.0.0

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* @license https://opensource.org/licenses/mit-license.php MIT License

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namespace Cake\Core;

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/**

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* ClassLoader

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class ClassLoader

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{

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/**

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* An associative array where the key is a namespace prefix and the value

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* is an array of base directories for classes in that namespace.

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* @var array

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protected $_prefixes = [];

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/**

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* Register loader with SPL autoloader stack.

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* @return void

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public function register()

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{

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spl_autoload_register([$this, 'loadClass']);

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}

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/**

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* Adds a base directory for a namespace prefix.

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* @param string $prefix The namespace prefix.

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* @param string $baseDir A base directory for class files in the

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* namespace.

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* @param bool $prepend If true, prepend the base directory to the stack

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* instead of appending it; this causes it to be searched first rather

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* than last.

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* @return void

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public function addNamespace($prefix, $baseDir, $prepend = false)

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{

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$prefix = trim($prefix, '\\') . '\\';

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$baseDir = rtrim($baseDir, '/') . DIRECTORY_SEPARATOR;

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$baseDir = rtrim($baseDir, DIRECTORY_SEPARATOR) . '/';

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if (!isset($this->_prefixes[$prefix])) {

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$this->_prefixes[$prefix] = [];

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}

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if ($prepend) {

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array_unshift($this->_prefixes[$prefix], $baseDir);

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} else {

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$this->_prefixes[$prefix][] = $baseDir;

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}

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}

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/**

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* Loads the class file for a given class name.

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* @param string $class The fully-qualified class name.

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* @return string|false The mapped file name on success, or boolean false on

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* failure.

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public function loadClass($class)

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{

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$prefix = $class;

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while (($pos = strrpos($prefix, '\\')) !== false) {

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$prefix = substr($class, 0, $pos + 1);

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$relativeClass = substr($class, $pos + 1);

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$mappedFile = $this->_loadMappedFile($prefix, $relativeClass);

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if ($mappedFile) {

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return $mappedFile;

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}

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$prefix = rtrim($prefix, '\\');

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}

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return false;

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}

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/**

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* Load the mapped file for a namespace prefix and relative class.

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* @param string $prefix The namespace prefix.

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* @param string $relativeClass The relative class name.

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* @return string|false Boolean false if no mapped file can be loaded, or the

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* name of the mapped file that was loaded.

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protected function _loadMappedFile($prefix, $relativeClass)

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{

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if (!isset($this->_prefixes[$prefix])) {

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return false;

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}

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foreach ($this->_prefixes[$prefix] as $baseDir) {

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$file = $baseDir . str_replace('\\', DIRECTORY_SEPARATOR, $relativeClass) . '.php';

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if ($this->_requireFile($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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}

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/**

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* If a file exists, require it from the file system.

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* @param string $file The file to require.

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* @return bool True if the file exists, false if not.

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protected function _requireFile($file)

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{

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if (file_exists($file)) {

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require $file;

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return true;

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}

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return false;

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}

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}

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