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<?php

namespace Composer\Autoload;

defined('_ELXIS_') or die ('Direct access to this location is not allowed');

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */


/**
 * ClassLoader implements a PSR-0, PSR-4 and classmap class loader.
 *
 *     $loader = new \Composer\Autoload\ClassLoader();
 *
 *     // register classes with namespaces
 *     $loader->add('Symfony\Component', __DIR__.'/component');
 *     $loader->add('Symfony',           __DIR__.'/framework');
 *
 *     // activate the autoloader
 *     $loader->register();
 *
 *     // to enable searching the include path (eg. for PEAR packages)
 *     $loader->setUseIncludePath(true);
 *
 * In this example, if you try to use a class in the Symfony\Component
 * namespace or one of its children (Symfony\Component\Console for instance),
 * the autoloader will first look for the class under the component/
 * directory, and it will then fallback to the framework/ directory if not
 * found before giving up.
 *
 * This class is loosely based on the Symfony UniversalClassLoader.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Jordi Boggiano <j.boggiano@seld.be>
 * @see    http://www.php-fig.org/psr/psr-0/
 * @see    http://www.php-fig.org/psr/psr-4/
 */
class ClassLoader
{
   
// PSR-4
   
private $prefixLengthsPsr4 = array();
    private
$prefixDirsPsr4 = array();
    private
$fallbackDirsPsr4 = array();

   
// PSR-0
   
private $prefixesPsr0 = array();
    private
$fallbackDirsPsr0 = array();

    private
$useIncludePath = false;
    private
$classMap = array();

    private
$classMapAuthoritative = false;

    public function
getPrefixes()
    {
        if (!empty(
$this->prefixesPsr0)) {
            return
call_user_func_array('array_merge', $this->prefixesPsr0);
        }

        return array();
    }

    public function
getPrefixesPsr4()
    {
        return
$this->prefixDirsPsr4;
    }

    public function
getFallbackDirs()
    {
        return
$this->fallbackDirsPsr0;
    }

    public function
getFallbackDirsPsr4()
    {
        return
$this->fallbackDirsPsr4;
    }

    public function
getClassMap()
    {
        return
$this->classMap;
    }

   
/**
     * @param array $classMap Class to filename map
     */
   
public function addClassMap(array $classMap)
    {
        if (
$this->classMap) {
           
$this->classMap = array_merge($this->classMap, $classMap);
        } else {
           
$this->classMap = $classMap;
        }
    }

   
/**
     * Registers a set of PSR-0 directories for a given prefix, either
     * appending or prepending to the ones previously set for this prefix.
     *
     * @param string       $prefix  The prefix
     * @param array|string $paths   The PSR-0 root directories
     * @param bool         $prepend Whether to prepend the directories
     */
   
public function add($prefix, $paths, $prepend = false)
    {
        if (!
$prefix) {
            if (
$prepend) {
               
$this->fallbackDirsPsr0 = array_merge(
                    (array)
$paths,
                   
$this->fallbackDirsPsr0
               
);
            } else {
               
$this->fallbackDirsPsr0 = array_merge(
                   
$this->fallbackDirsPsr0,
                    (array)
$paths
               
);
            }

            return;
        }

       
$first = $prefix[0];
        if (!isset(
$this->prefixesPsr0[$first][$prefix])) {
           
$this->prefixesPsr0[$first][$prefix] = (array) $paths;

            return;
        }
        if (
$prepend) {
           
$this->prefixesPsr0[$first][$prefix] = array_merge(
                (array)
$paths,
               
$this->prefixesPsr0[$first][$prefix]
            );
        } else {
           
$this->prefixesPsr0[$first][$prefix] = array_merge(
               
$this->prefixesPsr0[$first][$prefix],
                (array)
$paths
           
);
        }
    }

   
/**
     * 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-4 base directories
     * @param bool         $prepend Whether to prepend the directories
     *
     * @throws \InvalidArgumentException
     */
   
public function addPsr4($prefix, $paths, $prepend = false)
    {
        if (!
$prefix) {
           
// Register directories for the root namespace.
           
if ($prepend) {
               
$this->fallbackDirsPsr4 = array_merge(
                    (array)
$paths,
                   
$this->fallbackDirsPsr4
               
);
            } else {
               
$this->fallbackDirsPsr4 = array_merge(
                   
$this->fallbackDirsPsr4,
                    (array)
$paths
               
);
            }
        } elseif (!isset(
$this->prefixDirsPsr4[$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.");
            }
           
$this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
           
$this->prefixDirsPsr4[$prefix] = (array) $paths;
        } elseif (
$prepend) {
           
// Prepend directories for an already registered namespace.
           
$this->prefixDirsPsr4[$prefix] = array_merge(
                (array)
$paths,
               
$this->prefixDirsPsr4[$prefix]
            );
        } else {
           
// Append directories for an already registered namespace.
           
$this->prefixDirsPsr4[$prefix] = array_merge(
               
$this->prefixDirsPsr4[$prefix],
                (array)
$paths
           
);
        }
    }

   
/**
     * Registers a set of PSR-0 directories for a given prefix,
     * replacing any others previously set for this prefix.
     *
     * @param string       $prefix The prefix
     * @param array|string $paths  The PSR-0 base directories
     */
   
public function set($prefix, $paths)
    {
        if (!
$prefix) {
           
$this->fallbackDirsPsr0 = (array) $paths;
        } else {
           
$this->prefixesPsr0[$prefix[0]][$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
     */
   
public function setPsr4($prefix, $paths)
    {
        if (!
$prefix) {
           
$this->fallbackDirsPsr4 = (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.");
            }
           
$this->prefixLengthsPsr4[$prefix[0]][$prefix] = $length;
           
$this->prefixDirsPsr4[$prefix] = (array) $paths;
        }
    }

   
/**
     * Turns on searching the include path for class files.
     *
     * @param bool $useIncludePath
     */
   
public function setUseIncludePath($useIncludePath)
    {
       
$this->useIncludePath = $useIncludePath;
    }

   
/**
     * Can be used to check if the autoloader uses the include path to check
     * for classes.
     *
     * @return bool
     */
   
public function getUseIncludePath()
    {
        return
$this->useIncludePath;
    }

   
/**
     * Turns off searching the prefix and fallback directories for classes
     * that have not been registered with the class map.
     *
     * @param bool $classMapAuthoritative
     */
   
public function setClassMapAuthoritative($classMapAuthoritative)
    {
       
$this->classMapAuthoritative = $classMapAuthoritative;
    }

   
/**
     * Should class lookup fail if not found in the current class map?
     *
     * @return bool
     */
   
public function isClassMapAuthoritative()
    {
        return
$this->classMapAuthoritative;
    }

   
/**
     * Registers this instance as an autoloader.
     *
     * @param bool $prepend Whether to prepend the autoloader or not
     */
   
public function register($prepend = false)
    {
       
spl_autoload_register(array($this, 'loadClass'), true, $prepend);
    }

   
/**
     * Unregisters this instance as an autoloader.
     */
   
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;
    }

    private function
findFileWithExtension($class, $ext)
    {
       
// PSR-4 lookup
       
$logicalPathPsr4 = strtr($class, '\\', DIRECTORY_SEPARATOR) . $ext;

       
$first = $class[0];
        if (isset(
$this->prefixLengthsPsr4[$first])) {
            foreach (
$this->prefixLengthsPsr4[$first] as $prefix => $length) {
                if (
0 === strpos($class, $prefix)) {
                    foreach (
$this->prefixDirsPsr4[$prefix] as $dir) {
                        if (
file_exists($file = $dir . DIRECTORY_SEPARATOR . substr($logicalPathPsr4, $length))) {
                            return
$file;
                        }
                    }
                }
            }
        }

       
// PSR-4 fallback dirs
       
foreach ($this->fallbackDirsPsr4 as $dir) {
            if (
file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr4)) {
                return
$file;
            }
        }

       
// PSR-0 lookup
       
if (false !== $pos = strrpos($class, '\\')) {
           
// namespaced class name
           
$logicalPathPsr0 = substr($logicalPathPsr4, 0, $pos + 1)
                .
strtr(substr($logicalPathPsr4, $pos + 1), '_', DIRECTORY_SEPARATOR);
        } else {
           
// PEAR-like class name
           
$logicalPathPsr0 = strtr($class, '_', DIRECTORY_SEPARATOR) . $ext;
        }

        if (isset(
$this->prefixesPsr0[$first])) {
            foreach (
$this->prefixesPsr0[$first] as $prefix => $dirs) {
                if (
0 === strpos($class, $prefix)) {
                    foreach (
$dirs as $dir) {
                        if (
file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
                            return
$file;
                        }
                    }
                }
            }
        }

       
// PSR-0 fallback dirs
       
foreach ($this->fallbackDirsPsr0 as $dir) {
            if (
file_exists($file = $dir . DIRECTORY_SEPARATOR . $logicalPathPsr0)) {
                return
$file;
            }
        }

       
// PSR-0 include paths.
       
if ($this->useIncludePath && $file = stream_resolve_include_path($logicalPathPsr0)) {
            return
$file;
        }
    }
}

/**
 * Scope isolated include.
 *
 * Prevents access to $this/self from included files.
 */
function includeFile($file)
{
    include
$file;
}