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<?php |
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|
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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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|
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namespace Composer\Autoload; |
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|
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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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private $vendorDir; |
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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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|
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// PSR-0 |
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private $prefixesPsr0 = array(); |
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private $fallbackDirsPsr0 = array(); |
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|
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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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|
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private static $registeredLoaders = array(); |
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|
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public function __construct($vendorDir = null) |
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{ |
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$this->vendorDir = $vendorDir; |
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} |
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|
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public function getPrefixes() |
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{ |
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if (!empty($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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|
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return array(); |
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} |
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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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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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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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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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/** |
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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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/** |
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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) $paths |
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); |
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} |
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|
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return; |
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} |
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|
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$first = $prefix[0]; |
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if (!isset($this->prefixesPsr0[$first][$prefix])) { |
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$this->prefixesPsr0[$first][$prefix] = (array) $paths; |
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|
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return; |
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} |
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if ($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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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/** |
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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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if (null === $this->vendorDir) { |
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return; |
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} |
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|
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if ($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] = $this; |
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} |
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} |
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|
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/** |
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* Unregisters this instance as an autoloader. |
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*/ |
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public function unregister() |
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{ |
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spl_autoload_unregister(array($this, 'loadClass')); |
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|
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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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/** |
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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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|
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return true; |
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} |
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|
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return null; |
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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 $file; |
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} |
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} |
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|
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$file = $this->findFileWithExtension($class, '.php'); |
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|
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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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|
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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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|
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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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|
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return $file; |
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} |
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|
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/** |
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* Returns the currently registered loaders indexed by their corresponding vendor directories. |
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* |
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* @return self[] |
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*/ |
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public static function getRegisteredLoaders() |
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{ |
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return self::$registeredLoaders; |
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} |
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|
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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) . $ext; |
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|
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$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 $file; |
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} |
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} |
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} |
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} |
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} |
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|
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// PSR-4 fallback dirs |
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foreach ($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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|
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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) . $ext; |
| 443 |
} |
| 444 |
|
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if (isset($this->prefixesPsr0[$first])) { |
| 446 |
foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) { |
| 447 |
if (0 === strpos($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 $file; |
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} |
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} |
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} |
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} |
| 455 |
} |
| 456 |
|
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// PSR-0 fallback dirs |
| 458 |
foreach ($this->fallbackDirsPsr0 as $dir) { |
| 459 |
if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) { |
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return $file; |
| 461 |
} |
| 462 |
} |
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|
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// PSR-0 include paths. |
| 465 |
if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) { |
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return $file; |
| 467 |
} |
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|
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return false; |
| 470 |
} |
| 471 |
} |
| 472 |
|
| 473 |
/** |
| 474 |
* Scope isolated include. |
| 475 |
* |
| 476 |
* Prevents access to $this/self from included files. |
| 477 |
*/ |
| 478 |
function includeFile($file) |
| 479 |
{ |
| 480 |
include $file; |
| 481 |
} |
| 482 |
|
