Viewing file:  ClassLoader.php (7.11 KB) -rw-r--r--
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<?php
/**
* This file is based on Composer's autoloader.
*
* (c) Nils Adermann <naderman@naderman.de>
* Jordi Boggiano <j.boggiano@seld.be>
*
* @package SqlParser
* @subpackage Autoload
*/
namespace SqlParserAutoload;
/**
* ClassLoader implements a PSR-4 class loader,
*
* This class is loosely based on the Symfony UniversalClassLoader.
* This class is a stripped version of Composer's ClassLoader.
*
* @package SqlParser
* @subpackage Autoload
* @author Fabien Potencier <fabien@symfony.com>
* @author Jordi Boggiano <j.boggiano@seld.be>
*/
class ClassLoader
{
public $prefixLengths = array();
public $prefixDirs = array();
public $fallbackDirs = array();
public $classMap = array();
public $classMapAuthoritative = false;
/**
* @param array $classMap Class to filename map
*
* @return void
*/
public function addClassMap(array $classMap)
{
if (!empty($this->classMap)) {
$this->classMap = array_merge($this->classMap, $classMap);
} else {
$this->classMap = $classMap;
}
}
/**
* Registers a set of PSR-4 directories for a given namespace, either
* appending or prepending to the ones previously set for this namespace.
*
* @param string $prefix The prefix/namespace, with trailing '\\'
* @param array|string $paths The PSR-0 base directories
* @param bool $prepend Whether to prepend the directories
*
* @throws \InvalidArgumentException
*
* @return void
*/
public function add($prefix, $paths, $prepend = false)
{
if (!$prefix) {
// Register directories for the root namespace.
if ($prepend) {
$this->fallbackDirs = array_merge(
(array) $paths,
$this->fallbackDirs
);
} else {
$this->fallbackDirs = array_merge(
$this->fallbackDirs,
(array) $paths
);
}
} elseif (!isset($this->prefixDirs[$prefix])) {
// Register directories for a new namespace.
$length = strlen($prefix);
if ('\\' !== $prefix[$length - 1]) {
throw new InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
}
$this->prefixLengths[$prefix[0]][$prefix] = $length;
$this->prefixDirs[$prefix] = (array) $paths;
} elseif ($prepend) {
// Prepend directories for an already registered namespace.
$this->prefixDirs[$prefix] = array_merge(
(array) $paths,
$this->prefixDirs[$prefix]
);
} else {
// Append directories for an already registered namespace.
$this->prefixDirs[$prefix] = array_merge(
$this->prefixDirs[$prefix],
(array) $paths
);
}
}
/**
* Registers a set of PSR-4 directories for a given namespace,
* replacing any others previously set for this namespace.
*
* @param string $prefix The prefix/namespace, with trailing '\\'
* @param array|string $paths The PSR-4 base directories
*
* @throws \InvalidArgumentException
*
* @return void
*/
public function set($prefix, $paths)
{
if (!$prefix) {
$this->fallbackDirs = (array) $paths;
} else {
$length = strlen($prefix);
if ('\\' !== $prefix[$length - 1]) {
throw new InvalidArgumentException("A non-empty PSR-4 prefix must end with a namespace separator.");
}
$this->prefixLengths[$prefix[0]][$prefix] = $length;
$this->prefixDirs[$prefix] = (array) $paths;
}
}
/**
* Registers this instance as an autoloader.
*
* @param bool $prepend Whether to prepend the autoloader or not
*
* @return void
*/
public function register($prepend = false)
{
spl_autoload_register(array($this, 'loadClass'), true, $prepend);
}
/**
* Unregisters this instance as an autoloader.
*
* @return void
*/
public function unregister()
{
spl_autoload_unregister(array($this, 'loadClass'));
}
/**
* Loads the given class or interface.
*
* @param string $class The name of the class
*
* @return bool|null True if loaded, null otherwise
*/
public function loadClass($class)
{
if ($file = $this->findFile($class)) {
includeFile($file);
return true;
}
}
/**
* Finds the path to the file where the class is defined.
*
* @param string $class The name of the class
*
* @return string|false The path if found, false otherwise
*/
public function findFile($class)
{
// work around for PHP 5.3.0 - 5.3.2 https://bugs.php.net/50731
if ('\\' == $class[0]) {
$class = substr($class, 1);
}
// class map lookup
if (isset($this->classMap[$class])) {
return $this->classMap[$class];
}
if ($this->classMapAuthoritative) {
return false;
}
$file = $this->findFileWithExtension($class, '.php');
// Search for Hack files if we are running on HHVM
if ($file === null && defined('HHVM_VERSION')) {
$file = $this->findFileWithExtension($class, '.hh');
}
if ($file === null) {
// Remember that this class does not exist.
return $this->classMap[$class] = false;
}
return $file;
}
/**
* Finds a file that defines the specified class and has the specified
* extension.
*
* @param string $class The name of the class
* @param string $ext The extension of the file
*
* @return string|false The path if found, false otherwise
*/
public function findFileWithExtension($class, $ext)
{
$logicalPath = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;
$first = $class[0];
if (isset($this->prefixLengths[$first])) {
foreach ($this->prefixLengths[$first] as $prefix => $length) {
if (0 === strpos($class, $prefix)) {
foreach ($this->prefixDirs[$prefix] as $dir) {
if (is_file($file = $dir . DIRECTORY_SEPARATOR . substr($logicalPath, $length))) {
return $file;
}
}
}
}
}
foreach ($this->fallbackDirs as $dir) {
if (is_file($file = $dir . DIRECTORY_SEPARATOR . $logicalPath)) {
return $file;
}
}
return false;
}
}
if (!function_exists('SqlParser\\Autoload\\includeFile')) {
/**
* Scope isolated include.
*
* Prevents access to $this/self from included files.
*
* @param string $file The name of the file
*
* @return void
*/
function includeFile($file)
{
include $file;
}
}
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