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<?php
namespace Luracast\Restler {
/**
* Class that implements spl_autoload facilities and multiple
* conventions support.
* Supports composer libraries and 100% PSR-0 compliant.
* In addition we enable namespace prefixing and class aliases.
*
* @category Framework
* @package Restler
* @subpackage helper
* @author Nick Lombard <github@jigsoft.co.za>
* @copyright 2012 Luracast
* @version 3.0.0rc6
*/
class AutoLoader
{
protected static $instance, // the singleton instance reference
$perfectLoaders, // used to keep the ideal list of loaders
$rogueLoaders = array(), // other auto loaders now unregistered
$classMap = array(), // the class to include file mapping
$aliases = array( // aliases and prefixes instead of null list aliases
'Luracast\\Restler' => null,
'Luracast\\Restler\\Format' => null,
'Luracast\\Restler\\Data' => null,
'Luracast\\Restler\\Filter' => null,
);
/**
* Singleton instance facility.
*
* @static
* @return AutoLoader the current instance or new instance if none exists.
*/
public static function instance()
{
static::$instance = static::$instance ?: new static();
return static::thereCanBeOnlyOne();
}
/**
* Helper function to add a path to the include path.
* AutoLoader uses the include path to discover classes.
*
* @static
*
* @param $path string absolute or relative path.
*
* @return bool false if the path cannot be resolved
* or the resolved absolute path.
*/
public static function addPath($path) {
if (false === $path = stream_resolve_include_path($path))
return false;
else
set_include_path($path.PATH_SEPARATOR.get_include_path());
return $path;
}
/**
* Other autoLoaders interfere and cause duplicate class loading.
* AutoLoader is capable enough to handle all standards so no need
* for others stumbling about.
*
* @return callable the one true auto loader.
*/
public static function thereCanBeOnlyOne() {
if (static::$perfectLoaders === spl_autoload_functions())
return static::$instance;
if (false !== $loaders = spl_autoload_functions())
if (0 < $count = count($loaders))
for ($i = 0, static::$rogueLoaders += $loaders;
$i < $count && false != ($loader = $loaders[$i]);
$i++)
if ($loader !== static::$perfectLoaders[0])
spl_autoload_unregister($loader);
return static::$instance;
}
/**
* Seen this before cache handler.
* Facilitates both lookup and persist operations as well as convenience,
* load complete map functionality. The key can only be given a non falsy
* value once, this will be truthy for life.
*
* @param $key mixed class name considered or a collection of
* classMap entries
* @param $value mixed optional not required when doing a query on
* key. Default is false we haven't seen this
* class. Most of the time it will be the filename
* for include and is set to true if we are unable
* to load this class iow true == it does not exist.
* value may also be a callable auto loader function.
*
* @return mixed The known value for the key or false if key has no value
*/
public static function seen($key, $value = false)
{
if (is_array($key)) {
static::$classMap = $key + static::$classMap;
return false;
}
if (empty(static::$classMap[$key]))
static::$classMap[$key] = $value;
if (is_string($alias = static::$classMap[$key]))
if (isset(static::$classMap[$alias]))
return static::$classMap[$alias];
return static::$classMap[$key];
}
/**
* Protected constructor to enforce singleton pattern.
* Populate a default include path.
* All possible includes cant possibly be catered for and if you
* require another path then simply add it calling set_include_path.
*/
protected function __construct()
{
static::$perfectLoaders = array($this);
if (false === static::seen('__include_path')) {
$paths = explode(PATH_SEPARATOR, get_include_path());
$slash = DIRECTORY_SEPARATOR;
$dir = dirname(__DIR__);
$source_dir = dirname($dir);
$dir = dirname($source_dir);
foreach (
array(
array($source_dir),
array($dir, '..', '..', 'composer'),
array($dir, 'vendor', 'composer'),
array($dir, '..', '..', '..', 'php'),
array($dir, 'vendor', 'php'))
as $includePath)
if (false !== $path = stream_resolve_include_path(
implode($slash, $includePath)
))
if ('composer' == end($includePath) &&
false !== $classmapPath = stream_resolve_include_path(
"$path{$slash}autoload_classmap.php"
)
) {
static::seen(static::loadFile(
$classmapPath
));
$paths = array_merge(
$paths,
array_values(static::loadFile(
"$path{$slash}autoload_namespaces.php"
))
);
} else
$paths[] = $path;
$paths = array_filter(array_map(
function ($path) {
if (false == $realPath = @realpath($path))
return null;
return $realPath . DIRECTORY_SEPARATOR;
},
$paths
));
natsort($paths);
static::seen(
'__include_path',
implode(PATH_SEPARATOR, array_unique($paths))
);
}
set_include_path(static::seen('__include_path'));
}
/**
* Attempt to include the path location.
* Called from a static context which will not expose the AutoLoader
* instance itself.
*
* @param $path string location of php file on the include path
*
* @return bool|mixed returns reference obtained from the include or false
*/
private static function loadFile($path)
{
return \Luracast_Restler_autoloaderInclude($path);
}
/**
* Attempt to load class with namespace prefixes.
*
* @param $className string class name
*
* @return bool|mixed reference to discovered include or false
*/
private function loadPrefixes($className)
{
$currentClass = $className;
if (false !== $pos = strrpos($className, '\\'))
$className = substr($className, $pos);
else
$className = "\\$className";
for (
$i = 0,
$file = false,
$count = count(static::$aliases),
$prefixes = array_keys(static::$aliases);
$i < $count
&& false === $file
&& false === $file = $this->discover(
$variant = $prefixes[$i++].$className,
$currentClass
);
$file = $this->loadAliases($variant)
);
return $file;
}
/**
* Attempt to load configured aliases based on namespace part of class name.
*
* @param $className string fully qualified class name.
*
* @return bool|mixed reference to discovered include or false
*/
private function loadAliases($className)
{
$file = false;
if (preg_match('/(.+)(\\\\\w+$)/U', $className, $parts))
for (
$i = 0,
$aliases = isset(static::$aliases[$parts[1]])
? static::$aliases[$parts[1]] : array(),
$count = count($aliases);
$i < $count && false === $file;
$file = $this->discover(
"{$aliases[$i++]}$parts[2]",
$className
)
) ;
return $file;
}
/**
* Load from rogueLoaders as last resort.
* It may happen that a custom auto loader may load classes in a unique way,
* these classes cannot be seen otherwise nor should we attempt to cover every
* possible deviation. If we still can't find a class, as a last resort, we will
* run through the list of rogue loaders and verify if we succeeded.
*
* @param $className string className that can't be found
* @param null $loader callable loader optional when the loader is known
*
* @return bool false unless className now exists
*/
private function loadLastResort($className, $loader = null) {
// @CHANGE LDR Add protection to avoid conflict with other autoloader
/*print 'Try to load '.$className."\n";
if (in_array($className, array('Google_Client')))
{
return false;
}*/
$loaders = array_unique(static::$rogueLoaders);
if (isset($loader)) {
if (false === array_search($loader, $loaders))
static::$rogueLoaders[] = $loader;
return $this->loadThisLoader($className, $loader);
}
foreach ($loaders as $loader)
if (false !== $file = $this->loadThisLoader($className, $loader))
return $file;
return false;
}
/**
* Helper for loadLastResort.
* Use loader with $className and see if className exists.
*
* @param $className string name of a class to load
* @param $loader callable autoLoader method
*
* @return bool false unless className exists
*/
private function loadThisLoader($className, $loader) {
if (is_callable($loader)
&& false !== $file = $loader($className)
&& $this->exists($className, $loader))
return $file;
return false;
}
/**
* Create an alias for class.
*
* @param $className string the name of the alias class
* @param $currentClass string the current class this alias references
*/
private function alias($className, $currentClass)
{
// @CHANGE LDR
if ($className == 'Luracast\Restler\string') return;
if ($className == 'Luracast\Restler\mixed') return;
if ($className != $currentClass
&& false !== strpos($className, $currentClass))
if (!class_exists($currentClass, false)
&& class_alias($className, $currentClass))
static::seen($currentClass, $className);
}
/**
* Discovery process.
*
* @param $className string class name to discover
* @param $currentClass string optional name of current class when
* looking up an alias
*
* @return bool|mixed resolved include reference or false
*/
private function discover($className, $currentClass = null)
{
$currentClass = $currentClass ?: $className;
/** The short version we've done this before and found it in cache */
if (false !== $file = static::seen($className)) {
if (!$this->exists($className))
if (is_callable($file))
$file = $this->loadLastResort($className, $file);
elseif($file = stream_resolve_include_path($file))
$file = static::loadFile($file);
$this->alias($className, $currentClass);
return $file;
}
/** We did not find it in cache, lets look for it shall we */
/** replace \ with / and _ in CLASS NAME with / = PSR-0 in 3 lines */
$file = preg_replace("/\\\|_(?=\w+$)/", DIRECTORY_SEPARATOR, $className);
if (false === $file = stream_resolve_include_path("$file.php"))
return false;
/** have we loaded this file before could this be an alias */
if (in_array($file, get_included_files())) {
if (false !== $sameFile = array_search($file, static::$classMap))
if (!$this->exists($className, $file))
if (false !== strpos($sameFile, $className))
$this->alias($sameFile, $className);
return $file;
}
$state = array_merge(get_declared_classes(), get_declared_interfaces());
if (false !== $result = static::loadFile($file)) {
if ($this->exists($className, $file))
$this->alias($className, $currentClass);
elseif (false != $diff = array_diff(
array_merge(get_declared_classes(), get_declared_interfaces()), $state))
foreach ($diff as $autoLoaded)
if ($this->exists($autoLoaded, $file))
if (false !== strpos($autoLoaded, $className))
$this->alias($autoLoaded, $className);
if (!$this->exists($currentClass))
$result = false;
}
return $result;
}
/**
* Checks whether supplied string exists in a loaded class or interface.
* As a convenience the supplied $mapping can be the value for seen.
*
* @param $className string The class or interface to verify
* @param $mapping string (optional) value for map/seen if found to exist
*
* @return bool whether the class/interface exists without calling auto loader
*/
private function exists($className, $mapping = null)
{
if (class_exists($className, false)
|| interface_exists($className, false))
if (isset($mapping))
return static::seen($className, $mapping);
else
return true;
return false;
}
/**
* Auto loader callback through __invoke object as function.
*
* @param $className string class/interface name to auto load
*
* @return mixed|null the reference from the include or null
*/
public function __invoke($className)
{
if (empty($className))
return false;
if (false !== $includeReference = $this->discover($className))
return $includeReference;
static::thereCanBeOnlyOne();
if (false !== $includeReference = $this->loadAliases($className))
return $includeReference;
if (false !== $includeReference = $this->loadPrefixes($className))
return $includeReference;
if (false !== $includeReference = $this->loadLastResort($className))
return $includeReference;
static::seen($className, true);
return null;
}
}
}
namespace {
/**
* Include function in the root namespace to include files optimized
* for the global context.
*
* @param $path string path of php file to include into the global context.
*
* @return mixed|bool false if the file could not be included.
*/
function Luracast_Restler_autoloaderInclude($path) {
return include $path;
}
}