ClassLoader.php
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ClassLoader.php
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	<?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 \Closure(string):void */
	private static $includeFile;

	/** @var string\|null */
	private $vendorDir;

	// PSR-4
	/**
	* @var array<string, array<string, int>>
	*/
	private $prefixLengthsPsr4 = array();
	/**
	* @var array<string, list<string>>
	*/
	private $prefixDirsPsr4 = array();
	/**
	* @var list<string>
	*/
	private $fallbackDirsPsr4 = array();

	// PSR-0
	/**
	* List of PSR-0 prefixes
	*
	* Structured as array('F (first letter)' => array('Foo\Bar (full prefix)' => array('path', 'path2')))
	*
	* @var array<string, array<string, list<string>>>
	*/
	private $prefixesPsr0 = array();
	/**
	* @var list<string>
	*/
	private $fallbackDirsPsr0 = array();

	/** @var bool */
	private $useIncludePath = false;

	/**
	* @var array<string, string>
	*/
	private $classMap = array();

	/** @var bool */
	private $classMapAuthoritative = false;

	/**
	* @var array<string, bool>
	*/
	private $missingClasses = array();

	/** @var string\|null */
	private $apcuPrefix;

	/**
	* @var array<string, self>
	*/
	private static $registeredLoaders = array();

	/**
	* @param string\|null $vendorDir
	*/
	public function __construct($vendorDir = null)
	{
	$this->vendorDir = $vendorDir;
	self::initializeIncludeClosure();
	}

	/**
	* @return array<string, list<string>>
	*/
	public function getPrefixes()
	{
	if (!empty($this->prefixesPsr0)) {
	return call_user_func_array('array_merge', array_values($this->prefixesPsr0));
	}

	return array();
	}

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

	/**
	* @return list<string>
	*/
	public function getFallbackDirs()
	{
	return $this->fallbackDirsPsr0;
	}

	/**
	* @return list<string>
	*/
	public function getFallbackDirsPsr4()
	{
	return $this->fallbackDirsPsr4;
	}

	/**
	* @return array<string, string> Array of classname => path
	*/
	public function getClassMap()
	{
	return $this->classMap;
	}

	/**
	* @param array<string, string> $classMap Class to filename map
	*
	* @return void
	*/
	public function addClassMap(array $classMap)
	{
	if ($this->classMap) {
	$this->classMap = array_merge($this->classMap, $classMap);
	} else {
	$this->classMap = $classMap;
	}
	}

	/**
	* Registers a set of PSR-0 directories for a given prefix, either
	* appending or prepending to the ones previously set for this prefix.
	*
	* @param string $prefix The prefix
	* @param list<string>\|string $paths The PSR-0 root directories
	* @param bool $prepend Whether to prepend the directories
	*
	* @return void
	*/
	public function add($prefix, $paths, $prepend = false)
	{
	$paths = (array) $paths;
	if (!$prefix) {
	if ($prepend) {
	$this->fallbackDirsPsr0 = array_merge(
	$paths,
	$this->fallbackDirsPsr0
	);
	} else {
	$this->fallbackDirsPsr0 = array_merge(
	$this->fallbackDirsPsr0,
	$paths
	);
	}

	return;
	}

	$first = $prefix[0];
	if (!isset($this->prefixesPsr0[$first][$prefix])) {
	$this->prefixesPsr0[$first][$prefix] = $paths;

	return;
	}
	if ($prepend) {
	$this->prefixesPsr0[$first][$prefix] = array_merge(
	$paths,
	$this->prefixesPsr0[$first][$prefix]
	);
	} else {
	$this->prefixesPsr0[$first][$prefix] = array_merge(
	$this->prefixesPsr0[$first][$prefix],
	$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 list<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)
	{
	$paths = (array) $paths;
	if (!$prefix) {
	// Register directories for the root namespace.
	if ($prepend) {
	$this->fallbackDirsPsr4 = array_merge(
	$paths,
	$this->fallbackDirsPsr4
	);
	} else {
	$this->fallbackDirsPsr4 = array_merge(
	$this->fallbackDirsPsr4,
	$paths
	);
	}
	} elseif (!isset($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] = $paths;
	} elseif ($prepend) {
	// Prepend directories for an already registered namespace.
	$this->prefixDirsPsr4[$prefix] = array_merge(
	$paths,
	$this->prefixDirsPsr4[$prefix]
	);
	} else {
	// Append directories for an already registered namespace.
	$this->prefixDirsPsr4[$prefix] = array_merge(
	$this->prefixDirsPsr4[$prefix],
	$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 list<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 list<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;
	}

	if ($prepend) {
	self::$registeredLoaders = array($this->vendorDir => $this) + self::$registeredLoaders;
	} else {
	unset(self::$registeredLoaders[$this->vendorDir]);
	self::$registeredLoaders[$this->vendorDir] = $this;
	}
	}

	/**
	* Unregisters this instance as an autoloader.
	*
	* @return void
	*/
	public function unregister()
	{
	spl_autoload_unregister(array($this, 'loadClass'));

	if (null !== $this->vendorDir) {
	unset(self::$registeredLoaders[$this->vendorDir]);
	}
	}

	/**
	* Loads the given class or interface.
	*
	* @param string $class The name of the class
	* @return true\|null True if loaded, null otherwise
	*/
	public function loadClass($class)
	{
	if ($file = $this->findFile($class)) {
	$includeFile = self::$includeFile;
	$includeFile($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;
	}

	/**
	* Returns the currently registered loaders keyed by their corresponding vendor directories.
	*
	* @return array<string, self>
	*/
	public static function getRegisteredLoaders()
	{
	return self::$registeredLoaders;
	}

	/**
	* @param string $class
	* @param string $ext
	* @return string\|false
	*/
	private function findFileWithExtension($class, $ext)
	{
	// PSR-4 lookup
	$logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;

	$first = $class[0];
	if (isset($this->prefixLengthsPsr4[$first])) {
	$subPath = $class;
	while (false !== $lastPos = strrpos($subPath, '\\')) {
	$subPath = substr($subPath, 0, $lastPos);
	$search = $subPath . '\\';
	if (isset($this->prefixDirsPsr4[$search])) {
	$pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
	foreach ($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;
	}

	/**
	* @return void
	*/
	private static function initializeIncludeClosure()
	{
	if (self::$includeFile !== null) {
	return;
	}

	/**
	* Scope isolated include.
	*
	* Prevents access to $this/self from included files.
	*
	* @param string $file
	* @return void
	*/
	self::$includeFile = \Closure::bind(static function($file) {
	include $file;
	}, null, null);
	}
	}

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