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<?php
/**
* CMF for web applications based on Zend Framework 1 and Doctrine 2
* Copyright (C) 2010 Eugene Gruzdev aka yugeon
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @copyright Copyright (c) 2010 yugeon <yugeon.ru@gmail.com>
* @license http://www.gnu.org/licenses/gpl-3.0.html GNU GPLv3
*/
namespace Xboom\Loader;
/**
* Description of Autoloader
*
* @author yugeon
*/
class Autoloader
{
const NS_SEPARATOR = '\\';
const PREFIX_SEPARATOR = '_';
/**
* @var Xboom\Loader\Autoloader Singleton instance
*/
protected static $_instance = null;
/**
* @var array Supported namespaces 'Zend' and 'ZendX' by default.
*/
protected static $_namespaces = array(
'Zend' => '',
'ZendX' => '',
);
/**
* Helper method to calculate the correct class path
*
* @param string $class
* @return False if not matched other wise the correct path
*/
public static function getClassPath($class)
{
$separator = self::PREFIX_SEPARATOR;
if (false !== strpos($class, self::NS_SEPARATOR))
{
//if exist php 5.3 namespace separator
$separator = self::NS_SEPARATOR;
}
$segments = explode($separator, $class);
if (count($segments) < 2)
{
// assumes all resources have a component and class name, minimum
return false;
}
$final = array_pop($segments);
$component = '';
$lastMatch = false;
do
{
$segment = array_shift($segments);
$component .= empty($component) ? $segment : $separator . $segment;
if (isset(self::$_namespaces[$component]))
{
$lastMatch = $component;
}
}
while (count($segments));
if (!$lastMatch)
{
return false;
}
$final = substr($class, strlen($lastMatch) + 1);
if (empty(self::$_namespaces[$lastMatch]))
{
$path = str_replace($separator, DIRECTORY_SEPARATOR, $lastMatch)
. DIRECTORY_SEPARATOR;
}
else
{
$path = self::$_namespaces[$lastMatch];
}
$classPath = $path
. str_replace($separator, DIRECTORY_SEPARATOR, $final) . '.php';
return $classPath;
}
/**
* Autoload a class
*
* @param $class
* @return mixed
* False [if unable to load $class]
* get_class($class) [if $class is successfully loaded]
*/
public static function autoload($class)
{
$classPath = self::getClassPath($class);
if (false !== $classPath)
{
return @include $classPath;
}
return false;
}
/**
* Retrieve singleton instance
*
* @return Xboom\Loader\Autoloader
*/
public static function getInstance()
{
if (null === self::$_instance)
{
self::$_instance = new self();
}
return self::$_instance;
}
/**
* Constructor
*
* Registers instance with spl_autoload stack
*
* @return void
*/
protected function __construct()
{
spl_autoload_register(array(__CLASS__, 'autoload'), true, true);
}
/**
* Reset the singleton instance
*
* @return void
*/
public static function resetInstance()
{
self::$_instance = null;
}
/**
* Get a list of registered autoload namespaces
*
* @return array
*/
public function getRegisteredNamespaces()
{
return array_keys(self::$_namespaces);
}
/**
* Register a namespace/directory pair
*
* @param string|array $namespace
* @param string $directory Default empty string (use include_path)
*/
public function registerNamespace($namespace, $directory = '')
{
if (is_string($namespace))
{
$namespace = array($namespace => $directory);
}
elseif (!is_array($namespace))
{
throw new \InvalidArgumentException('Invalid namespace provided');
}
foreach ($namespace as $ns => $dir)
{
$ns = rtrim($ns, self::PREFIX_SEPARATOR . self::NS_SEPARATOR);
self::$_namespaces[$ns] = $this->normalizeDirectory($dir);
}
}
/**
* Unload a registered autoload namespace
*
* @param string|array $namespace
*/
public function unregisterNamespace($namespace)
{
if (is_string($namespace))
{
$namespace = (array) $namespace;
}
elseif (!is_array($namespace))
{
throw new \InvalidArgumentException('Invalid namespace provided');
}
foreach ($namespace as $ns)
{
$ns = rtrim($ns, self::PREFIX_SEPARATOR . self::NS_SEPARATOR);
if (isset(self::$_namespaces[$ns]))
{
unset(self::$_namespaces[$ns]);
}
}
}
/**
* Normalize the directory to include a trailing directory separator
* If empty directory then use include_path
*
* @param string $directory
* @return string
*/
protected function normalizeDirectory($directory)
{
if ('' === $directory)
{
return '';
}
$last = $directory[strlen($directory) - 1];
if (in_array($last, array('/', '\\')))
{
$directory[strlen($directory) - 1] = DIRECTORY_SEPARATOR;
return $directory;
}
$directory .= DIRECTORY_SEPARATOR;
return $directory;
}
}