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<?php

/*
 * 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.
 */

namespace Composer\Autoload;

/**
 * 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    https://www.php-fig.org/psr/psr-0/
 * @see    https://www.php-fig.org/psr/psr-4/
 */
class ClassLoader {

private $vendorDir;

// 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;
	private $missingClasses        = array();
	private $apcuPrefix;

private static $registeredLoaders = array();

public function __construct( $vendorDir = null ) {
		$this->vendorDir = $vendorDir;
	}

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

/**
	 * APCu prefix to use to cache found/not-found classes, if the extension is enabled.
	 *
	 * @param string|null $apcuPrefix
	 */
	public function setApcuPrefix( $apcuPrefix ) {
		$this->apcuPrefix = function_exists( 'apcu_fetch' ) && filter_var( ini_get( 'apc.enabled' ), FILTER_VALIDATE_BOOLEAN ) ? $apcuPrefix : null;
	}

/**
	 * The APCu prefix in use, or null if APCu caching is not enabled.
	 *
	 * @return string|null
	 */
	public function getApcuPrefix() {
		return $this->apcuPrefix;
	}

/**
	 * 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 );

if ( null === $this->vendorDir ) {
			// no-op
		} elseif ( $prepend ) {
			self::$registeredLoaders = array( $this->vendorDir => $this ) + self::$registeredLoaders;
		} else {
			unset( self::$registeredLoaders[ $this->vendorDir ] );
			self::$registeredLoaders[ $this->vendorDir ] = $this;
		}
	}

/**
	 * Unregisters this instance as an autoloader.
	 */
	public function unregister() {
		spl_autoload_unregister( array( $this, 'loadClass' ) );

if ( null !== $this->vendorDir ) {
			unset( self::$registeredLoaders[ $this->vendorDir ] );
		}
	}

/**
	 * 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 ) {
		// class map lookup
		if ( isset( $this->classMap[ $class ] ) ) {
			return $this->classMap[ $class ];
		}
		if ( $this->classMapAuthoritative || isset( $this->missingClasses[ $class ] ) ) {
			return false;
		}
		if ( null !== $this->apcuPrefix ) {
			$file = apcu_fetch( $this->apcuPrefix . $class, $hit );
			if ( $hit ) {
				return $file;
			}
		}

$file = $this->findFileWithExtension( $class, '.php' );

// Search for Hack files if we are running on HHVM
		if ( false === $file && defined( 'HHVM_VERSION' ) ) {
			$file = $this->findFileWithExtension( $class, '.hh' );
		}

if ( null !== $this->apcuPrefix ) {
			apcu_add( $this->apcuPrefix . $class, $file );
		}

if ( false === $file ) {
			// Remember that this class does not exist.
			$this->missingClasses[ $class ] = true;
		}

return $file;
	}

/**
	 * Returns the currently registered loaders indexed by their corresponding vendor directories.
	 *
	 * @return self[]
	 */
	public static function getRegisteredLoaders() {
		return self::$registeredLoaders;
	}

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

$first = $class[0];
		if ( isset( $this->prefixLengthsPsr4[ $first ] ) ) {
			$subPath = $class;
			while ( false !== $lastPos = strrpos( $subPath, '\\' ) ) {
				$subPath = substr( $subPath, 0, $lastPos );
				$search  = $subPath . '\\';
				if ( isset( $this->prefixDirsPsr4[ $search ] ) ) {
					$pathEnd = DIRECTORY_SEPARATOR . substr( $logicalPathPsr4, $lastPos + 1 );
					foreach ( $this->prefixDirsPsr4[ $search ] as $dir ) {
						if ( file_exists( $file = $dir . $pathEnd ) ) {
							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;
		}

return false;
	}
}

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

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