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expressolivretools / vendor / composer / ClassLoader.php @ 68c328a2

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1 68c328a2 Alexandre Correia
<?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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    private $vendorDir;
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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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    private static $registeredLoaders = array();
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    public function __construct($vendorDir = null)
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    {
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        $this->vendorDir = $vendorDir;
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    }
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    public function getPrefixes()
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    {
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        if (!empty($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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        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] = $this;
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        }
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    }
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    /**
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     * Unregisters this instance as an autoloader.
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     */
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    public function unregister()
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    {
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        spl_autoload_unregister(array($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');
382
        }
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        if (null !== $this->apcuPrefix) {
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            apcu_add($this->apcuPrefix.$class, $file);
386
        }
387
388
        if (false === $file) {
389
            // Remember that this class does not exist.
390
            $this->missingClasses[$class] = true;
391
        }
392
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        return $file;
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    }
395
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    /**
397
     * Returns the currently registered loaders indexed by their corresponding vendor directories.
398
     *
399
     * @return self[]
400
     */
401
    public static function getRegisteredLoaders()
402
    {
403
        return self::$registeredLoaders;
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    }
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406
    private function findFileWithExtension($class, $ext)
407
    {
408
        // PSR-4 lookup
409
        $logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
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        $first = $class[0];
412
        if (isset($this->prefixLengthsPsr4[$first])) {
413
            $subPath = $class;
414
            while (false !== $lastPos = strrpos($subPath, '\\')) {
415
                $subPath = substr($subPath, 0, $lastPos);
416
                $search = $subPath . '\\';
417
                if (isset($this->prefixDirsPsr4[$search])) {
418
                    $pathEnd = DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $lastPos + 1);
419
                    foreach ($this->prefixDirsPsr4[$search] as $dir) {
420
                        if (file_exists($file = $dir . $pathEnd)) {
421
                            return $file;
422
                        }
423
                    }
424
                }
425
            }
426
        }
427
428
        // PSR-4 fallback dirs
429
        foreach ($this->fallbackDirsPsr4 as $dir) {
430
            if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) {
431
                return $file;
432
            }
433
        }
434
435
        // PSR-0 lookup
436
        if (false !== $pos = strrpos($class, '\\')) {
437
            // namespaced class name
438
            $logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1)
439
                . strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
440
        } else {
441
            // PEAR-like class name
442
            $logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
443
        }
444
445
        if (isset($this->prefixesPsr0[$first])) {
446
            foreach ($this->prefixesPsr0[$first] as $prefix => $dirs) {
447
                if (0 === strpos($class, $prefix)) {
448
                    foreach ($dirs as $dir) {
449
                        if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
450
                            return $file;
451
                        }
452
                    }
453
                }
454
            }
455
        }
456
457
        // PSR-0 fallback dirs
458
        foreach ($this->fallbackDirsPsr0 as $dir) {
459
            if (file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
460
                return $file;
461
            }
462
        }
463
464
        // PSR-0 include paths.
465
        if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) {
466
            return $file;
467
        }
468
469
        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
}