<?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 http://www.php-fig.org/psr/psr-0/

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* @see http://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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// PSR-4

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private $prefixLengthsPsr4 = array();

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private $prefixDirsPsr4 = array();

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private $fallbackDirsPsr4 = array();

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// PSR-0

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private $prefixesPsr0 = array();

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private $fallbackDirsPsr0 = array();

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private $useIncludePath = false;

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private $classMap = array();

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private $classMapAuthoritative = false;

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private $missingClasses = array();

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private $apcuPrefix;

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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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public function getPrefixesPsr4()

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{

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return $this->prefixDirsPsr4;

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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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public function getFallbackDirsPsr4()

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{

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return $this->fallbackDirsPsr4;

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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 array $classMap Class to filename map

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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 array|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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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 array|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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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 array|string $paths The PSR-0 base directories

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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 array|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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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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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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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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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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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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}

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/**

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* Unregisters this instance as an autoloader.

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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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}

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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 bool|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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}

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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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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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function includeFile($file)

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{

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include $file;

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}

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