319 lines
8.6 KiB
PHP
319 lines
8.6 KiB
PHP
<?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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* UniversalClassLoader implements a "universal" autoloader for PHP 5.3.
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*
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* It is able to load classes that use either:
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*
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* * The technical interoperability standards for PHP 5.3 namespaces and
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* class names (https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md);
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*
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* * The PEAR naming convention for classes (http://pear.php.net/).
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*
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* Classes from a sub-namespace or a sub-hierarchy of PEAR classes can be
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* looked for in a list of locations to ease the vendoring of a sub-set of
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* classes for large projects.
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*
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* Example usage:
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*
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* $loader = new UniversalClassLoader();
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*
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* // register classes with namespaces
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* $loader->registerNamespaces(array(
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* 'Symfony\Component' => __DIR__.'/component',
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* 'Symfony' => __DIR__.'/framework',
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* 'Sensio' => array(__DIR__.'/src', __DIR__.'/vendor'),
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* ));
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*
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* // register a library using the PEAR naming convention
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* $loader->registerPrefixes(array(
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* 'Swift_' => __DIR__.'/Swift',
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* ));
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*
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*
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* // to enable searching the include path (e.g. for PEAR packages)
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* $loader->useIncludePath(true);
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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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* 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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* @author Fabien Potencier <fabien@symfony.com>
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*
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* @api
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*/
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class UniversalClassLoader
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{
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private $namespaces = array();
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private $prefixes = array();
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private $namespaceFallbacks = array();
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private $prefixFallbacks = array();
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private $useIncludePath = false;
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/**
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* Turns on searching the include for class files. Allows easy loading
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* of installed PEAR packages
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*
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* @param bool $useIncludePath
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*/
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public function useIncludePath($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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* Gets the configured namespaces.
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*
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* @return array A hash with namespaces as keys and directories as values
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*/
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public function getNamespaces()
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{
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return $this->namespaces;
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}
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/**
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* Gets the configured class prefixes.
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*
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* @return array A hash with class prefixes as keys and directories as values
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*/
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public function getPrefixes()
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{
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return $this->prefixes;
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}
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/**
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* Gets the directory(ies) to use as a fallback for namespaces.
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*
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* @return array An array of directories
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*/
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public function getNamespaceFallbacks()
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{
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return $this->namespaceFallbacks;
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}
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/**
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* Gets the directory(ies) to use as a fallback for class prefixes.
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*
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* @return array An array of directories
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*/
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public function getPrefixFallbacks()
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{
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return $this->prefixFallbacks;
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}
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/**
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* Registers the directory to use as a fallback for namespaces.
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*
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* @param array $dirs An array of directories
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*
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* @api
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*/
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public function registerNamespaceFallbacks(array $dirs)
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{
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$this->namespaceFallbacks = $dirs;
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}
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/**
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* Registers a directory to use as a fallback for namespaces.
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*
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* @param string $dir A directory
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*/
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public function registerNamespaceFallback($dir)
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{
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$this->namespaceFallbacks[] = $dir;
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}
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/**
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* Registers directories to use as a fallback for class prefixes.
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*
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* @param array $dirs An array of directories
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*
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* @api
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*/
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public function registerPrefixFallbacks(array $dirs)
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{
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$this->prefixFallbacks = $dirs;
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}
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/**
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* Registers a directory to use as a fallback for class prefixes.
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*
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* @param string $dir A directory
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*/
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public function registerPrefixFallback($dir)
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{
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$this->prefixFallbacks[] = $dir;
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}
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/**
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* Registers an array of namespaces
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*
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* @param array $namespaces An array of namespaces (namespaces as keys and locations as values)
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*
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* @api
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*/
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public function registerNamespaces(array $namespaces)
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{
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foreach ($namespaces as $namespace => $locations) {
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$this->namespaces[$namespace] = (array) $locations;
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}
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}
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/**
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* Registers a namespace.
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*
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* @param string $namespace The namespace
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* @param array|string $paths The location(s) of the namespace
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*
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* @api
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*/
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public function registerNamespace($namespace, $paths)
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{
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$this->namespaces[$namespace] = (array) $paths;
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}
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/**
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* Registers an array of classes using the PEAR naming convention.
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*
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* @param array $classes An array of classes (prefixes as keys and locations as values)
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*
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* @api
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*/
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public function registerPrefixes(array $classes)
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{
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foreach ($classes as $prefix => $locations) {
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$this->prefixes[$prefix] = (array) $locations;
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}
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}
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/**
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* Registers a set of classes using the PEAR naming convention.
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*
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* @param string $prefix The classes prefix
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* @param array|string $paths The location(s) of the classes
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*
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* @api
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*/
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public function registerPrefix($prefix, $paths)
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{
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$this->prefixes[$prefix] = (array) $paths;
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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 $prepend Whether to prepend the autoloader or not
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*
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* @api
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*/
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public function register($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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* Loads the given class or interface.
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*
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* @param string $class The name of the class
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*
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* @return bool|null True, if loaded
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*/
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public function loadClass($class)
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{
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if ($file = $this->findFile($class)) {
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require $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 $class The name of the class
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*
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* @return string|null The path, if found
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*/
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public function findFile($class)
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{
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if (false !== $pos = strrpos($class, '\\')) {
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// namespaced class name
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$namespace = substr($class, 0, $pos);
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$className = substr($class, $pos + 1);
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$normalizedClass = str_replace('\\', DIRECTORY_SEPARATOR, $namespace).DIRECTORY_SEPARATOR.str_replace('_', DIRECTORY_SEPARATOR, $className).'.php';
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foreach ($this->namespaces as $ns => $dirs) {
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if (0 !== strpos($namespace, $ns)) {
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continue;
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}
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foreach ($dirs as $dir) {
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$file = $dir.DIRECTORY_SEPARATOR.$normalizedClass;
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if (is_file($file)) {
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return $file;
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}
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}
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}
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foreach ($this->namespaceFallbacks as $dir) {
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$file = $dir.DIRECTORY_SEPARATOR.$normalizedClass;
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if (is_file($file)) {
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return $file;
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}
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}
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} else {
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// PEAR-like class name
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$normalizedClass = str_replace('_', DIRECTORY_SEPARATOR, $class).'.php';
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foreach ($this->prefixes as $prefix => $dirs) {
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if (0 !== strpos($class, $prefix)) {
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continue;
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}
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foreach ($dirs as $dir) {
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$file = $dir.DIRECTORY_SEPARATOR.$normalizedClass;
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if (is_file($file)) {
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return $file;
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}
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}
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}
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foreach ($this->prefixFallbacks as $dir) {
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$file = $dir.DIRECTORY_SEPARATOR.$normalizedClass;
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if (is_file($file)) {
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return $file;
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}
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}
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}
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if ($this->useIncludePath && $file = stream_resolve_include_path($normalizedClass)) {
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return $file;
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}
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}
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}
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