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<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc. (https://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 3.0.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Core;
/**
* ClassLoader
*/
class ClassLoader
{
/**
* An associative array where the key is a namespace prefix and the value
* is an array of base directories for classes in that namespace.
*
* @var array
*/
protected $_prefixes = [];
/**
* Register loader with SPL autoloader stack.
*
* @return void
*/
public function register()
{
spl_autoload_register([$this, 'loadClass']);
}
/**
* Adds a base directory for a namespace prefix.
*
* @param string $prefix The namespace prefix.
* @param string $baseDir A base directory for class files in the
* namespace.
* @param bool $prepend If true, prepend the base directory to the stack
* instead of appending it; this causes it to be searched first rather
* than last.
* @return void
*/
public function addNamespace($prefix, $baseDir, $prepend = false)
{
$prefix = trim($prefix, '\\') . '\\';
$baseDir = rtrim($baseDir, '/') . DIRECTORY_SEPARATOR;
$baseDir = rtrim($baseDir, DIRECTORY_SEPARATOR) . '/';
if (!isset($this->_prefixes[$prefix])) {
$this->_prefixes[$prefix] = [];
}
if ($prepend) {
array_unshift($this->_prefixes[$prefix], $baseDir);
} else {
$this->_prefixes[$prefix][] = $baseDir;
}
}
/**
* Loads the class file for a given class name.
*
* @param string $class The fully-qualified class name.
* @return string|false The mapped file name on success, or boolean false on
* failure.
*/
public function loadClass($class)
{
$prefix = $class;
while (($pos = strrpos($prefix, '\\')) !== false) {
$prefix = substr($class, 0, $pos + 1);
$relativeClass = substr($class, $pos + 1);
$mappedFile = $this->_loadMappedFile($prefix, $relativeClass);
if ($mappedFile) {
return $mappedFile;
}
$prefix = rtrim($prefix, '\\');
}
return false;
}
/**
* Load the mapped file for a namespace prefix and relative class.
*
* @param string $prefix The namespace prefix.
* @param string $relativeClass The relative class name.
* @return mixed Boolean false if no mapped file can be loaded, or the
* name of the mapped file that was loaded.
*/
protected function _loadMappedFile($prefix, $relativeClass)
{
if (!isset($this->_prefixes[$prefix])) {
return false;
}
foreach ($this->_prefixes[$prefix] as $baseDir) {
$file = $baseDir . str_replace('\\', DIRECTORY_SEPARATOR, $relativeClass) . '.php';
if ($this->_requireFile($file)) {
return $file;
}
}
return false;
}
/**
* If a file exists, require it from the file system.
*
* @param string $file The file to require.
* @return bool True if the file exists, false if not.
*/
protected function _requireFile($file)
{
if (file_exists($file)) {
require $file;
return true;
}
return false;
}
}