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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
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 // Grab SplAutoloader interface
 // require_once dirname(__FILE__) . '/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
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    New BSD {@link http://framework.zend.com/license/new-bsd}
  */
 class Zend_Loader_StandardAutoloader implements Zend_Loader_SplAutoloader
 {
     const NS_SEPARATOR     = '\\';
     const PREFIX_SEPARATOR = '_';
     const LOAD_NS          = 'namespaces';
     const LOAD_PREFIX      = 'prefixes';
     const ACT_AS_FALLBACK  = 'fallback_autoloader';
     const AUTOREGISTER_ZF  = 'autoregister_zf';
 
     /**
      * @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;
 
     /**
      * @var bool
      */
     protected $error;
 
     /**
      * Constructor
      *
      * @param  null|array|Traversable $options
      * @return void
      */
     public function __construct($options = null)
     {
         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 $options
      * @return Zend_Loader_StandardAutoloader
      */
     public function setOptions($options)
     {
         if (!is_array($options) && !($options instanceof Traversable)) {
             // require_once dirname(__FILE__) . '/Exception/InvalidArgumentException.php';
             throw new Zend_Loader_Exception_InvalidArgumentException('Options must be either an array or Traversable');
         }
 
         foreach ($options as $type => $pairs) {
             switch ($type) {
                 case self::AUTOREGISTER_ZF:
                     if ($pairs) {
                         $this->registerPrefix('Zend', dirname(dirname(__FILE__)));
                     }
                     break;
                 case self::LOAD_NS:
                     if (is_array($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 $flag
      * @return Zend_Loader_StandardAutoloader
      */
     public function setFallbackAutoloader($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 $directory
      * @return Zend_Loader_StandardAutoloader
      */
     public function registerNamespace($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 $namespaces
      * @return Zend_Loader_StandardAutoloader
      */
     public function registerNamespaces($namespaces)
     {
         if (!is_array($namespaces) && !$namespaces instanceof Traversable) {
             // require_once dirname(__FILE__) . '/Exception/InvalidArgumentException.php';
             throw new Zend_Loader_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 $directory
      * @return Zend_Loader_StandardAutoloader
      */
     public function registerPrefix($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 $prefixes
      * @return Zend_Loader_StandardAutoloader
      */
     public function registerPrefixes($prefixes)
     {
         if (!is_array($prefixes) && !$prefixes instanceof Traversable) {
             // require_once dirname(__FILE__) . '/Exception/InvalidArgumentException.php';
             throw new Zend_Loader_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'));
     }
 
     /**
      * Error handler
      *
      * Used by {@link loadClass} during fallback autoloading in PHP versions
      * prior to 5.3.0.
      * 
      * @param mixed $errno 
      * @param mixed $errstr 
      * @return void
      */
     public function handleError($errno, $errstr)
     {
         $this->error = true;
     }
 
     /**
      * 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 dirname(__FILE__) . '/Exception/InvalidArgumentException.php';
             throw new Zend_Loader_Exception_InvalidArgumentException();
         }
 
         // Fallback autoloading
         if ($type === self::ACT_AS_FALLBACK) {
             // create filename
             $filename = $this->transformClassNameToFilename($class, '');
             if (version_compare(PHP_VERSION, '5.3.2', '>=')) {
                 $resolvedName = stream_resolve_include_path($filename);
                 if ($resolvedName !== false) {
                     return include $resolvedName;
                 }
                 return false;
             }
             $this->error = false;
             set_error_handler(array($this, 'handleError'), E_WARNING);
             include $filename;
             restore_error_handler();
             if ($this->error) {
                 return false;
             }
             return class_exists($class, 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;
     }
 
 }