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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) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/**
* Zend_Exception
*/
require_once 'Zend/Exception.php';
/**
* Static methods for loading classes and files.
*
* @category Zend
* @package Zend_Loader
* @copyright Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Loader
{
/**
* Loads a class from a PHP file. The filename must be formatted
* as "$class.php".
*
* If $dirs is a string or an array, it will search the directories
* in the order supplied, and attempt to load the first matching file.
*
* If $dirs is null, it will split the class name at underscores to
* generate a path hierarchy (e.g., "Zend_Example_Class" will map
* to "Zend/Example/Class.php").
*
* If the file was not found in the $dirs, or if no $dirs were specified,
* it will attempt to load it from PHP's include_path.
*
* @param string $class - The full class name of a Zend component.
* @param string|array $dirs - OPTIONAL Either a path or an array of paths
* to search.
* @return void
* @throws Zend_Exception
*/
public static function loadClass($class, $dirs = null)
{
if (class_exists($class, false) || interface_exists($class, false)) {
return;
}
if ((null !== $dirs) && !is_string($dirs) && !is_array($dirs)) {
throw new Zend_Exception('Directory argument must be a string or an array');
}
if (null === $dirs) {
$dirs = array();
}
if (is_string($dirs)) {
$dirs = (array) $dirs;
}
// autodiscover the path from the class name
$path = str_replace('_', DIRECTORY_SEPARATOR, $class);
if ($path != $class) {
// use the autodiscovered path
$dirPath = dirname($path);
if (0 == count($dirs)) {
$dirs = array($dirPath);
} else {
foreach ($dirs as $key => $dir) {
$dir = rtrim($dir, '\\/');
$dirs[$key] = $dir . DIRECTORY_SEPARATOR . $dirPath;
}
}
$file = basename($path) . '.php';
} else {
$file = $class . '.php';
}
self::loadFile($file, $dirs, true);
if (!class_exists($class, false) && !interface_exists($class, false)) {
throw new Zend_Exception("File \"$file\" was loaded but class \"$class\" was not found in the file");
}
}
/**
* Loads a PHP file. This is a wrapper for PHP's include() function.
*
* $filename must be the complete filename, including any
* extension such as ".php". Note that a security check is performed that
* does not permit extended characters in the filename. This method is
* intended for loading Zend Framework files.
*
* If $dirs is a string or an array, it will search the directories
* in the order supplied, and attempt to load the first matching file.
*
* If the file was not found in the $dirs, or if no $dirs were specified,
* it will attempt to load it from PHP's include_path.
*
* If $once is TRUE, it will use include_once() instead of include().
*
* @param string $filename
* @param string|array $dirs - OPTIONAL either a path or array of paths
* to search.
* @param boolean $once
* @return mixed
* @throws Zend_Exception
*/
public static function loadFile($filename, $dirs = null, $once = false)
{
// security check
if (preg_match('/[^a-z0-9\-_.]/i', $filename)) {
throw new Zend_Exception('Security check: Illegal character in filename');
}
/**
* Determine if the file is readable, either within just the include_path
* or within the $dirs search list.
*/
$filespec = $filename;
if (empty($dirs)) {
$dirs = null;
}
if ($dirs === null) {
$found = self::isReadable($filespec);
} else {
foreach ((array)$dirs as $dir) {
$filespec = rtrim($dir, '\\/') . DIRECTORY_SEPARATOR . $filename;
$found = self::isReadable($filespec);
if ($found) {
break;
}
}
}
/**
* Throw an exception if the file could not be located
*/
if (!$found) {
throw new Zend_Exception("File \"$filespec\" was not found");
}
/**
* Attempt to include() the file.
*
* include() is not prefixed with the @ operator because if
* the file is loaded and contains a parse error, execution
* will halt silently and this is difficult to debug.
*
* Always set display_errors = Off on production servers!
*/
if ($once) {
return include_once $filespec;
} else {
return include $filespec ;
}
}
/**
* Returns TRUE if the $filename is readable, or FALSE otherwise.
* This function uses the PHP include_path, where PHP's is_readable()
* does not.
*
* @param string $filename
* @return boolean
*/
public static function isReadable($filename)
{
if (is_readable($filename)) {
return true;
}
$path = get_include_path();
$dirs = explode(PATH_SEPARATOR, $path);
foreach ($dirs as $dir) {
// No need to check against current dir -- already checked
if ('.' == $dir) {
continue;
}
if (is_readable($dir . DIRECTORY_SEPARATOR . $filename)) {
return true;
}
}
return false;
}
/**
* spl_autoload() suitable implementation for supporting class autoloading.
*
* Attach to spl_autoload() using the following:
* <code>
* spl_autoload_register(array('Zend_Loader', 'autoload'));
* </code>
*
* @param string $class
* @return string|false Class name on success; false on failure
*/
public static function autoload($class)
{
try {
self::loadClass($class);
return $class;
} catch (Exception $e) {
return false;
}
}
} |
