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<?php
/**
* This file is part of the Fedora Autoloader package.
*
* (c) Shawn Iwinski <shawn@iwin.ski> and Remi Collet <remi@fedoraproject.org>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Fedora\Autoloader;
class Autoload
{
/**
* @var bool Whether self is registered as an autoloader
*/
protected static $registered = false;
/**
* @var array Class map. See addClassMap() for description of elements
*/
protected static $classMap = array();
/**
* @var array PSR-4 mapping stack. See addPsr4() for description of elements
*/
protected static $psr4 = array();
/**
* @var array PSR-0 mapping stack. See addPsr0() for description of elements
*/
protected static $psr0 = array();
/**
* Static functions only.
*/
private function __construct()
{
}
/**
* Returns if self is registered as an autoloader.
*
* @return bool
*/
public static function isRegistered()
{
return static::$registered;
}
/**
* Register self as an autoloader (prepended).
*
* Sets {@link $registered} to `true` on self autoload register.
*
* No-op if self already registered (determined by {@link isRegistered()})
* as an autoloader.
*
* Called automatically from {@link addPsr4()} and {@link addClassMap()}
* if self not already registered (determined by {@link isRegistered()})
* as an autoloader.
*/
public static function register()
{
if (static::isRegistered()) {
return;
}
spl_autoload_register(array(__CLASS__, 'loadClass'), true, true);
static::$registered = true;
}
/**
* Add PSR-0 mapping.
*
* If self not already registered (determined by {@link isRegistered()}),
* registers by calling {@link register()}.
*
* Elements added to {@link $psr0} are:
* ```php
* array($prefix, $path)
* ```
*
* @param string $prefix Class or Namespace prefix (no `\` added)
* @param string $path Base path/directory (automatically suffixed with `DIRECTORY_SEPARATOR`)
* @param bool $prepend Whether or not to prepend to PSR-0 mapping stack
*
* @see http://www.php-fig.org/psr/psr-0/
*/
public static function addPsr0($prefix, $path, $prepend = false)
{
// If not registered, register.
if (!static::isRegistered()) {
static::register();
}
$path = rtrim($path, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
if ($prepend) {
array_unshift(static::$psr0, array($prefix, $path));
} else {
static::$psr0[] = array($prefix, $path);
}
}
/**
* Returns protected PSR-0 mappings.
*
* @return array
*/
public static function getPsr0()
{
return static::$psr0;
}
/**
* Add every dir in the include_path as a PSR-0 tree.
*/
public static function addIncludePath()
{
$paths = explode(PATH_SEPARATOR, get_include_path());
foreach ($paths as $path) {
if ($path == '.') {
continue;
}
self::addPsr0('', $path);
}
}
/**
* Add PSR-4 mapping.
*
* If self not already registered (determined by {@link isRegistered()}),
* registers by calling {@link register()}.
*
* Elements added to {@link $psr4} are:
* ```php
* array($prefix, $path)
* ```
*
* @param string $prefix Namespace prefix (automatically suffixed with `\`)
* @param string $path Base path/directory (automatically suffixed with `DIRECTORY_SEPARATOR`)
* @param bool $prepend Whether or not to prepend to PSR-4 mapping stack
*
* @see http://www.php-fig.org/psr/psr-4/
*/
public static function addPsr4($prefix, $path, $prepend = false)
{
if (empty($prefix)) {
throw new \InvalidArgumentException('Prefix must not be empty (i.e. no failover paths).');
}
// If not registered, register.
if (!static::isRegistered()) {
static::register();
}
$prefix = trim($prefix, '\\').'\\';
$path = rtrim($path, DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR;
if ($prepend) {
array_unshift(static::$psr4, array($prefix, $path));
} else {
static::$psr4[] = array($prefix, $path);
}
}
/**
* Returns protected PSR-4 mappings.
*
* @return array
*/
public static function getPsr4()
{
return static::$psr4;
}
public static function addClassMap(array $classMap, $path)
{
// If not registered, register.
if (!static::isRegistered()) {
static::register();
}
$path = rtrim($path, DIRECTORY_SEPARATOR);
if (isset(static::$classMap[$path])) {
static::$classMap[$path] = array_merge($classMap, static::$classMap[$path]);
} else {
static::$classMap[$path] = $classMap;
}
}
/**
* Returns protected class mappings.
*
* @return array
*/
public static function getClassMap()
{
return static::$classMap;
}
/**
* Loads a class' file.
*
* This is the self function registered as an autoload handler.
*
* @return bool
*/
public static function loadClass($class)
{
if ($file = static::findFileForClass($class)) {
includeFile($file);
return true;
}
return false;
}
/**
* Finds a class' file.
*
* Checks for a classmap and then loops through PSR-4 mappings.
*/
public static function findFileForClass($class)
{
$class = ltrim($class, '\\');
$lower = strtolower($class);
// Classmap
foreach (static::$classMap as $dir => $classmap) {
if (isset($classmap[$lower]) && file_exists($dir.$classmap[$lower])) {
return $dir.$classmap[$lower];
}
}
// PSR-4
// NOTE: Cannot use `foreach (static::$psr4 as list($prefix, $path))`
// for PHP < 5.5 compatibility.
foreach (static::$psr4 as $psr4) {
list($prefix, $path) = $psr4;
if (0 === strpos($class, $prefix)) {
$classWithoutPrefix = substr($class, strlen($prefix));
$file = $path.str_replace('\\', DIRECTORY_SEPARATOR, $classWithoutPrefix).'.php';
if (file_exists($file)) {
return $file;
}
}
}
// PSR-0
if (count(static::$psr0)) {
$pos = strrpos($class, '\\');
$file = $namespace = '';
if ($pos) {
$namespace = substr($class, 0, $pos + 1);
$class = substr($class, $pos + 1);
$file = str_replace('\\', DIRECTORY_SEPARATOR, $namespace);
}
$file .= str_replace('_', DIRECTORY_SEPARATOR, $class).'.php';
// NOTE: Cannot use `foreach (static::$psr0 as list($prefix, $path))`
// for PHP < 5.5 compatibility.
foreach (static::$psr0 as $psr0) {
list($prefix, $path) = $psr0;
if (empty($prefix) || 0 === strpos($namespace.$class, $prefix)) {
if (file_exists($path.$file)) {
return $path.$file;
}
}
}
}
}
}
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