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[ClassLoader] A PSR-4 compatible class loader
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‎src/Symfony/Component/ClassLoader/Psr4ClassLoader.php

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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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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 Symfony\Component\ClassLoader;
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/**
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* A PSR-4 compatible class loader.
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*
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* See http://www.php-fig.org/psr/psr-4/
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*
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* @author Alexander M. Turek <me@derrabus.de>
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*/
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class Psr4ClassLoader
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{
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/**
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* @var array
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*/
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private $prefixes = array();
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/**
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* @param string $prefix
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* @param string $baseDir
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*/
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public function addPrefix($prefix, $baseDir)
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{
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$prefix = trim($prefix, '\\').'\\';
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$baseDir = rtrim($baseDir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
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$this->prefixes[] = array($prefix, $baseDir);
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}
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/**
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* @param string $class
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*
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* @return string|null
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*/
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public function findFile($class)
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{
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$class = ltrim($class, '\\');
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foreach ($this->prefixes as $current) {
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list($currentPrefix, $currentBaseDir) = $current;
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if (0 === strpos($class, $currentPrefix)) {
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$classWithoutPrefix = substr($class, strlen($currentPrefix));
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$file = $currentBaseDir . str_replace('\\', DIRECTORY_SEPARATOR, $classWithoutPrefix) . '.php';
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if (file_exists($file)) {
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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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* @param string $class
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*
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* @return Boolean
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*/
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public function loadClass($class)
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{
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$file = $this->findFile($class);
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if (null !== $file) {
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require $file;
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return true;
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}
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return false;
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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 Boolean $prepend
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*/
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public function register($prepend = false)
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{
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spl_autoload_register(array($this, 'loadClass'), true, $prepend);
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}
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/**
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* Removes this instance from the registered autoloaders.
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*/
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public function unregister()
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{
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spl_autoload_unregister(array($this, 'loadClass'));
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}
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}

‎src/Symfony/Component/ClassLoader/Tests/Fixtures/psr-4/Class_With_Underscores.php

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<?php
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namespace Acme\DemoLib;
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class Class_With_Underscores
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{
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}

‎src/Symfony/Component/ClassLoader/Tests/Fixtures/psr-4/Foo.php

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<?php
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namespace Acme\DemoLib;
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class Foo
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{
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}

‎src/Symfony/Component/ClassLoader/Tests/Fixtures/psr-4/Lets/Go/Deeper/Class_With_Underscores.php

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<?php
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namespace Acme\DemoLib\Lets\Go\Deeper;
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class Class_With_Underscores
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{
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}

‎src/Symfony/Component/ClassLoader/Tests/Fixtures/psr-4/Lets/Go/Deeper/Foo.php

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<?php
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namespace Acme\DemoLib\Lets\Go\Deeper;
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class Foo
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{
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}

‎src/Symfony/Component/ClassLoader/Tests/Psr4ClassLoaderTest.php

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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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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 Symfony\Component\ClassLoader\Tests;
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use Symfony\Component\ClassLoader\Psr4ClassLoader;
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class Psr4ClassLoaderTest extends \PHPUnit_Framework_TestCase
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{
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/**
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* @param string $className
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* @dataProvider getLoadClassTests
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*/
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public function testLoadClass($className)
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{
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$loader = new Psr4ClassLoader();
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$loader->addPrefix(
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'Acme\\DemoLib',
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__DIR__ . DIRECTORY_SEPARATOR . 'Fixtures' . DIRECTORY_SEPARATOR . 'psr-4'
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);
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$loader->loadClass($className);
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$this->assertTrue(class_exists($className), sprintf('loadClass() should load %s', $className));
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}
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/**
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* @return array
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*/
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public function getLoadClassTests()
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{
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return array(
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array('Acme\\DemoLib\\Foo'),
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array('Acme\\DemoLib\\Class_With_Underscores'),
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array('Acme\\DemoLib\\Lets\\Go\\Deeper\\Foo'),
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array('Acme\\DemoLib\\Lets\\Go\\Deeper\\Class_With_Underscores')
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);
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}
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/**
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* @param string $className
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* @dataProvider getLoadNonexistentClassTests
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*/
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public function testLoadNonexistentClass($className)
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{
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$loader = new Psr4ClassLoader();
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$loader->addPrefix(
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'Acme\\DemoLib',
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__DIR__ . DIRECTORY_SEPARATOR . 'Fixtures' . DIRECTORY_SEPARATOR . 'psr-4'
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);
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$loader->loadClass($className);
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$this->assertFalse(class_exists($className), sprintf('loadClass() should not load %s', $className));
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}
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/**
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* @return array
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*/
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public function getLoadNonexistentClassTests()
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{
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return array(
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array('Acme\\DemoLib\\I_Do_Not_Exist'),
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array('UnknownVendor\\SomeLib\\I_Do_Not_Exist')
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);
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}
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}

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