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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Loader
* @subpackage Exception
* @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Loader;
// Grab SplAutoloader interface
require_once __DIR__ . '/SplAutoloader.php';
/**
* PSR-0 compliant autoloader
*
* Allows autoloading both namespaced and vendor-prefixed classes. Class
* lookups are performed on the filesystem. If a class file for the referenced
* class is not found, a PHP warning will be raised by include().
*
* @package Zend_Loader
* @license New BSD {@link http://framework.zend.com/license/new-bsd}
*/
class StandardAutoloader implements SplAutoloader
{
const NS_SEPARATOR = '\\';
const PREFIX_SEPARATOR = '_';
const LOAD_NS = 'namespaces';
const LOAD_PREFIX = 'prefixes';
const ACT_AS_FALLBACK = 'fallback_autoloader';
/**
* @var array Namespace/directory pairs to search; ZF library added by default
*/
protected $namespaces = array();
/**
* @var array Prefix/directory pairs to search
*/
protected $prefixes = array();
/**
* @var bool Whether or not the autoloader should also act as a fallback autoloader
*/
protected $fallbackAutoloaderFlag = false;
/**
* Constructor
*
* @param null|array|Traversable $options
* @return void
*/
public function __construct($options = null)
{
$this->registerNamespace('Zend', dirname(__DIR__));
if (null !== $options) {
$this->setOptions($options);
}
}
/**
* Configure autoloader
*
* Allows specifying both "namespace" and "prefix" pairs, using the
* following structure:
* <code>
* array(
* 'namespaces' => array(
* 'Zend' => '/path/to/Zend/library',
* 'Doctrine' => '/path/to/Doctrine/library',
* ),
* 'prefixes' => array(
* 'Phly_' => '/path/to/Phly/library',
* ),
* 'fallback_autoloader' => true,
* )
* </code>
*
* @param array|Traversable $options
* @return StandardAutoloader
*/
public function setOptions($options)
{
if (!is_array($options) && !($options instanceof \Traversable)) {
require_once __DIR__ . '/Exception/InvalidArgumentException.php';
throw new Exception\InvalidArgumentException('Options must be either an array or Traversable');
}
foreach ($options as $type => $pairs) {
switch ($type) {
case self::LOAD_NS:
if (is_array($pairs) || $pairs instanceof \Traversable) {
$this->registerNamespaces($pairs);
}
break;
case self::LOAD_PREFIX:
if (is_array($pairs) || $pairs instanceof \Traversable) {
$this->registerPrefixes($pairs);
}
break;
case self::ACT_AS_FALLBACK:
$this->setFallbackAutoloader($pairs);
break;
default:
// ignore
}
}
return $this;
}
/**
* Set flag indicating fallback autoloader status
*
* @param bool $flag
* @return StandardAutoloader
*/
public function setFallbackAutoloader($flag)
{
$this->fallbackAutoloaderFlag = (bool) $flag;
return $this;
}
/**
* Is this autoloader acting as a fallback autoloader?
*
* @return bool
*/
public function isFallbackAutoloader()
{
return $this->fallbackAutoloaderFlag;
}
/**
* Register a namespace/directory pair
*
* @param string $namespace
* @param string $directory
* @return StandardAutoloader
*/
public function registerNamespace($namespace, $directory)
{
$namespace = rtrim($namespace, self::NS_SEPARATOR). self::NS_SEPARATOR;
$this->namespaces[$namespace] = $this->normalizeDirectory($directory);
return $this;
}
/**
* Register many namespace/directory pairs at once
*
* @param array $namespaces
* @return StandardAutoloader
*/
public function registerNamespaces($namespaces)
{
if (!is_array($namespaces) && !$namespaces instanceof \Traversable) {
require_once __DIR__ . '/Exception/InvalidArgumentException.php';
throw new Exception\InvalidArgumentException('Namespace pairs must be either an array or Traversable');
}
foreach ($namespaces as $namespace => $directory) {
$this->registerNamespace($namespace, $directory);
}
return $this;
}
/**
* Register a prefix/directory pair
*
* @param string $prefix
* @param string $directory
* @return StandardAutoloader
*/
public function registerPrefix($prefix, $directory)
{
$prefix = rtrim($prefix, self::PREFIX_SEPARATOR). self::PREFIX_SEPARATOR;
$this->prefixes[$prefix] = $this->normalizeDirectory($directory);
return $this;
}
/**
* Register many namespace/directory pairs at once
*
* @param array $prefixes
* @return StandardAutoloader
*/
public function registerPrefixes($prefixes)
{
if (!is_array($prefixes) && !$prefixes instanceof \Traversable) {
require_once __DIR__ . '/Exception/InvalidArgumentException.php';
throw new Exception\InvalidArgumentException('Prefix pairs must be either an array or Traversable');
}
foreach ($prefixes as $prefix => $directory) {
$this->registerPrefix($prefix, $directory);
}
return $this;
}
/**
* Defined by Autoloadable; autoload a class
*
* @param string $class
* @return false|string
*/
public function autoload($class)
{
$isFallback = $this->isFallbackAutoloader();
if (false !== strpos($class, self::NS_SEPARATOR)) {
if ($this->loadClass($class, self::LOAD_NS)) {
return $class;
} elseif ($isFallback) {
return $this->loadClass($class, self::ACT_AS_FALLBACK);
}
return false;
}
if (false !== strpos($class, self::PREFIX_SEPARATOR)) {
if ($this->loadClass($class, self::LOAD_PREFIX)) {
return $class;
} elseif ($isFallback) {
return $this->loadClass($class, self::ACT_AS_FALLBACK);
}
return false;
}
if ($isFallback) {
return $this->loadClass($class, self::ACT_AS_FALLBACK);
}
return false;
}
/**
* Register the autoloader with spl_autoload
*
* @return void
*/
public function register()
{
spl_autoload_register(array($this, 'autoload'));
}
/**
* Transform the class name to a filename
*
* @param string $class
* @param string $directory
* @return string
*/
protected function transformClassNameToFilename($class, $directory)
{
// $class may contain a namespace portion, in which case we need
// to preserve any underscores in that portion.
$matches = array();
preg_match('/(?P<namespace>.+\\\)?(?P<class>[^\\\]+$)/', $class, $matches);
$class = (isset($matches['class'])) ? $matches['class'] : '';
$namespace = (isset($matches['namespace'])) ? $matches['namespace'] : '';
return $directory
. str_replace(self::NS_SEPARATOR, '/', $namespace)
. str_replace(self::PREFIX_SEPARATOR, '/', $class)
. '.php';
}
/**
* Load a class, based on its type (namespaced or prefixed)
*
* @param string $class
* @param string $type
* @return void
*/
protected function loadClass($class, $type)
{
if (!in_array($type, array(self::LOAD_NS, self::LOAD_PREFIX, self::ACT_AS_FALLBACK))) {
require_once __DIR__ . '/Exception/InvalidArgumentException.php';
throw new Exception\InvalidArgumentException();
}
// Fallback autoloading
if ($type === self::ACT_AS_FALLBACK) {
// create filename
$filename = $this->transformClassNameToFilename($class, '');
$resolvedName = stream_resolve_include_path($filename);
if ($resolvedName !== false) {
return include $resolvedName;
}
return false;
}
// Namespace and/or prefix autoloading
foreach ($this->$type as $leader => $path) {
if (0 === strpos($class, $leader)) {
// Trim off leader (namespace or prefix)
$trimmedClass = substr($class, strlen($leader));
// create filename
$filename = $this->transformClassNameToFilename($trimmedClass, $path);
if (file_exists($filename)) {
return include $filename;
}
return false;
}
}
return false;
}
/**
* Normalize the directory to include a trailing directory separator
*
* @param string $directory
* @return string
*/
protected function normalizeDirectory($directory)
{
$last = $directory[strlen($directory) - 1];
if (in_array($last, array('/', '\\'))) {
$directory[strlen($directory) - 1] = DIRECTORY_SEPARATOR;
return $directory;
}
$directory .= DIRECTORY_SEPARATOR;
return $directory;
}
}