573 lines
16 KiB
PHP
573 lines
16 KiB
PHP
<?php
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/*
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* This file is part of Composer.
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*
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* (c) Nils Adermann <naderman@naderman.de>
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* Jordi Boggiano <j.boggiano@seld.be>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Composer\Autoload;
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/**
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* ClassLoader implements a PSR-0, PSR-4 and classmap class loader.
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*
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* $loader = new \Composer\Autoload\ClassLoader();
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*
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* // register classes with namespaces
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* $loader->add('Symfony\Component', __DIR__.'/component');
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* $loader->add('Symfony', __DIR__.'/framework');
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*
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* // activate the autoloader
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* $loader->register();
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*
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* // to enable searching the include path (eg. for PEAR packages)
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* $loader->setUseIncludePath(true);
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*
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* In this example, if you try to use a class in the Symfony\Component
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* namespace or one of its children (Symfony\Component\Console for instance),
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* the autoloader will first look for the class under the component/
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* directory, and it will then fallback to the framework/ directory if not
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* found before giving up.
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*
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* This class is loosely based on the Symfony UniversalClassLoader.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Jordi Boggiano <j.boggiano@seld.be>
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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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*/
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class ClassLoader
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{
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/** @var ?string */
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private $vendorDir;
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// PSR-4
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/**
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* @var array[]
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* @psalm-var array<string, array<string, int>>
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*/
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private $prefixLengthsPsr4 = array();
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/**
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* @var array[]
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* @psalm-var array<string, array<int, string>>
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*/
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private $prefixDirsPsr4 = array();
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/**
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* @var array[]
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* @psalm-var array<string, string>
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*/
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private $fallbackDirsPsr4 = array();
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// PSR-0
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/**
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* @var array[]
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* @psalm-var array<string, array<string, string[]>>
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*/
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private $prefixesPsr0 = array();
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/**
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* @var array[]
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* @psalm-var array<string, string>
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*/
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private $fallbackDirsPsr0 = array();
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/** @var bool */
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private $useIncludePath = false;
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/**
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* @var string[]
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* @psalm-var array<string, string>
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*/
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private $classMap = array();
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/** @var bool */
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private $classMapAuthoritative = false;
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/**
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* @var bool[]
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* @psalm-var array<string, bool>
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*/
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private $missingClasses = array();
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/** @var ?string */
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private $apcuPrefix;
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/**
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* @var self[]
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*/
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private static $registeredLoaders = array();
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/**
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* @param ?string $vendorDir
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*/
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public function __construct($vendorDir = null)
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{
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$this->vendorDir = $vendorDir;
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}
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/**
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* @return string[]
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*/
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public function getPrefixes()
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{
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if (!empty($this->prefixesPsr0)) {
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return call_user_func_array('array_merge', array_values($this->prefixesPsr0));
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}
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return array();
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}
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/**
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* @return array[]
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* @psalm-return array<string, array<int, string>>
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*/
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public function getPrefixesPsr4()
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{
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return $this->prefixDirsPsr4;
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}
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/**
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* @return array[]
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* @psalm-return array<string, string>
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*/
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public function getFallbackDirs()
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{
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return $this->fallbackDirsPsr0;
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}
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/**
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* @return array[]
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* @psalm-return array<string, string>
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*/
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public function getFallbackDirsPsr4()
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{
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return $this->fallbackDirsPsr4;
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}
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/**
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* @return string[] Array of classname => path
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* @psalm-var array<string, string>
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*/
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public function getClassMap()
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{
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return $this->classMap;
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}
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/**
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* @param string[] $classMap Class to filename map
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* @psalm-param array<string, string> $classMap
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*
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* @return void
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*/
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public function addClassMap(array $classMap)
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{
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if ($this->classMap) {
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$this->classMap = array_merge($this->classMap, $classMap);
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} else {
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$this->classMap = $classMap;
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}
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}
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/**
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* Registers a set of PSR-0 directories for a given prefix, either
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* appending or prepending to the ones previously set for this prefix.
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*
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* @param string $prefix The prefix
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* @param string[]|string $paths The PSR-0 root directories
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* @param bool $prepend Whether to prepend the directories
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*
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* @return void
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*/
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public function add($prefix, $paths, $prepend = false)
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{
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if (!$prefix) {
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if ($prepend) {
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$this->fallbackDirsPsr0 = array_merge(
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(array) $paths,
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$this->fallbackDirsPsr0
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);
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} else {
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$this->fallbackDirsPsr0 = array_merge(
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$this->fallbackDirsPsr0,
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(array) $paths
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);
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}
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return;
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}
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$first = $prefix[0];
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if (!isset($this->prefixesPsr0[$first][$prefix])) {
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$this->prefixesPsr0[$first][$prefix] = (array) $paths;
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return;
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}
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if ($prepend) {
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$this->prefixesPsr0[$first][$prefix] = array_merge(
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(array) $paths,
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$this->prefixesPsr0[$first][$prefix]
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);
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} else {
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$this->prefixesPsr0[$first][$prefix] = array_merge(
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$this->prefixesPsr0[$first][$prefix],
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(array) $paths
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);
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}
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}
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/**
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* Registers a set of PSR-4 directories for a given namespace, either
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* appending or prepending to the ones previously set for this namespace.
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*
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* @param string $prefix The prefix/namespace, with trailing '\\'
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* @param string[]|string $paths The PSR-4 base directories
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* @param bool $prepend Whether to prepend the directories
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*
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* @throws \InvalidArgumentException
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*
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* @return void
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*/
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public function addPsr4($prefix, $paths, $prepend = false)
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{
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if (!$prefix) {
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// Register directories for the root namespace.
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if ($prepend) {
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$this->fallbackDirsPsr4 = array_merge(
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(array) $paths,
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$this->fallbackDirsPsr4
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);
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} else {
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$this->fallbackDirsPsr4 = array_merge(
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$this->fallbackDirsPsr4,
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(array) $paths
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);
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}
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} elseif (!isset($this->prefixDirsPsr4[$prefix])) {
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// Register directories for a new namespace.
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$length = strlen($prefix);
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if ('\\' !== $prefix[$length - 1]) {
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throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
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}
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$this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
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$this->prefixDirsPsr4[$prefix] = (array) $paths;
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} elseif ($prepend) {
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// Prepend directories for an already registered namespace.
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$this->prefixDirsPsr4[$prefix] = array_merge(
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(array) $paths,
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$this->prefixDirsPsr4[$prefix]
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);
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} else {
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// Append directories for an already registered namespace.
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$this->prefixDirsPsr4[$prefix] = array_merge(
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$this->prefixDirsPsr4[$prefix],
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(array) $paths
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);
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}
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}
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/**
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* Registers a set of PSR-0 directories for a given prefix,
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* replacing any others previously set for this prefix.
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*
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* @param string $prefix The prefix
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* @param string[]|string $paths The PSR-0 base directories
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*
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* @return void
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*/
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public function set($prefix, $paths)
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{
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if (!$prefix) {
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$this->fallbackDirsPsr0 = (array) $paths;
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} else {
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$this->prefixesPsr0[$prefix[0]][$prefix] = (array) $paths;
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}
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}
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/**
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* Registers a set of PSR-4 directories for a given namespace,
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* replacing any others previously set for this namespace.
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*
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* @param string $prefix The prefix/namespace, with trailing '\\'
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* @param string[]|string $paths The PSR-4 base directories
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*
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* @throws \InvalidArgumentException
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*
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* @return void
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*/
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public function setPsr4($prefix, $paths)
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{
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if (!$prefix) {
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$this->fallbackDirsPsr4 = (array) $paths;
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} else {
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$length = strlen($prefix);
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if ('\\' !== $prefix[$length - 1]) {
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throw new \InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
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}
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$this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
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$this->prefixDirsPsr4[$prefix] = (array) $paths;
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}
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}
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/**
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* Turns on searching the include path for class files.
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*
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* @param bool $useIncludePath
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*
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* @return void
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*/
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public function setUseIncludePath($useIncludePath)
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{
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$this->useIncludePath = $useIncludePath;
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}
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/**
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* Can be used to check if the autoloader uses the include path to check
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* for classes.
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*
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* @return bool
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*/
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public function getUseIncludePath()
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{
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return $this->useIncludePath;
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}
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/**
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* Turns off searching the prefix and fallback directories for classes
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* that have not been registered with the class map.
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*
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* @param bool $classMapAuthoritative
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*
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* @return void
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*/
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public function setClassMapAuthoritative($classMapAuthoritative)
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{
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$this->classMapAuthoritative = $classMapAuthoritative;
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}
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/**
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* Should class lookup fail if not found in the current class map?
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*
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* @return bool
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*/
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public function isClassMapAuthoritative()
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{
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return $this->classMapAuthoritative;
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}
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/**
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* APCu prefix to use to cache found/not-found classes, if the extension is enabled.
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*
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* @param string|null $apcuPrefix
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*
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* @return void
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*/
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public function setApcuPrefix($apcuPrefix)
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{
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$this->apcuPrefix = function_exists('apcu_fetch') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? $apcuPrefix : null;
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}
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/**
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* The APCu prefix in use, or null if APCu caching is not enabled.
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*
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* @return string|null
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*/
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public function getApcuPrefix()
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{
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return $this->apcuPrefix;
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}
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/**
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* Registers this instance as an autoloader.
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*
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* @param bool $prepend Whether to prepend the autoloader or not
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*
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* @return void
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*/
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public function register($prepend = false)
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{
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spl_autoload_register(array($this, 'loadClass'), true, $prepend);
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if (null === $this->vendorDir) {
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return;
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}
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if ($prepend) {
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self::$registeredLoaders = array($this->vendorDir => $this) + self::$registeredLoaders;
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} else {
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unset(self::$registeredLoaders[$this->vendorDir]);
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self::$registeredLoaders[$this->vendorDir] = $this;
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}
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}
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/**
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* Unregisters this instance as an autoloader.
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*
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* @return void
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*/
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public function unregister()
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{
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spl_autoload_unregister(array($this, 'loadClass'));
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if (null !== $this->vendorDir) {
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unset(self::$registeredLoaders[$this->vendorDir]);
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}
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}
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/**
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* Loads the given class or interface.
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*
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* @param string $class The name of the class
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* @return true|null True if loaded, null otherwise
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*/
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public function loadClass($class)
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{
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if ($file = $this->findFile($class)) {
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includeFile($file);
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return true;
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}
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return null;
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}
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/**
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* Finds the path to the file where the class is defined.
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*
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* @param string $class The name of the class
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*
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* @return string|false The path if found, false otherwise
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*/
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public function findFile($class)
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{
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// class map lookup
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if (isset($this->classMap[$class])) {
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return $this->classMap[$class];
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}
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if ($this->classMapAuthoritative || isset($this->missingClasses[$class])) {
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return false;
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}
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if (null !== $this->apcuPrefix) {
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$file = apcu_fetch($this->apcuPrefix.$class, $hit);
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if ($hit) {
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return $file;
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}
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}
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$file = $this->findFileWithExtension($class, '.php');
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// Search for Hack files if we are running on HHVM
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if (false === $file && defined('HHVM_VERSION')) {
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$file = $this->findFileWithExtension($class, '.hh');
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}
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if (null !== $this->apcuPrefix) {
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apcu_add($this->apcuPrefix.$class, $file);
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}
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if (false === $file) {
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// Remember that this class does not exist.
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$this->missingClasses[$class] = true;
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}
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return $file;
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}
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/**
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* Returns the currently registered loaders indexed by their corresponding vendor directories.
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*
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* @return self[]
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*/
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public static function getRegisteredLoaders()
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{
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return self::$registeredLoaders;
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}
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/**
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* @param string $class
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* @param string $ext
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* @return string|false
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*/
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private function findFileWithExtension($class, $ext)
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{
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// PSR-4 lookup
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$logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
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$first = $class[0];
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if (isset($this->prefixLengthsPsr4[$first])) {
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$subPath = $class;
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while (false !== $lastPos = strrpos($subPath, '\\')) {
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$subPath = substr($subPath, 0, $lastPos);
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$search = $subPath . '\\';
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if (isset($this->prefixDirsPsr4[$search])) {
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$pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
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foreach ($this->prefixDirsPsr4[$search] as $dir) {
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if (file_exists($file = $dir . $pathEnd)) {
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return $file;
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}
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}
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}
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}
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}
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// PSR-4 fallback dirs
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foreach ($this->fallbackDirsPsr4 as $dir) {
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if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) {
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return $file;
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}
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}
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// PSR-0 lookup
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if (false !== $pos = strrpos($class, '\\')) {
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// namespaced class name
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$logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1)
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. strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
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} else {
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// PEAR-like class name
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$logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
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}
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if (isset($this->prefixesPsr0[$first])) {
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foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) {
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if (0 === strpos($class, $prefix)) {
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foreach ($dirs as $dir) {
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if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
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return $file;
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}
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}
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}
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}
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}
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// PSR-0 fallback dirs
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foreach ($this->fallbackDirsPsr0 as $dir) {
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if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
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return $file;
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}
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}
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// PSR-0 include paths.
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if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) {
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return $file;
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}
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return false;
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}
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}
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/**
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* Scope isolated include.
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*
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* Prevents access to $this/self from included files.
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*
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* @param string $file
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* @return void
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* @private
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*/
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function includeFile($file)
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{
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include $file;
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}
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