WEBD-325-45/week-04/homework/libraries/loader.php

600 lines
16 KiB
PHP

<?php
/**
* @package Sport Stars
*
* Joomla! Content Management System
*
* @source https://github.com/joomla/joomla-cms/blob/4.1-dev/libraries/loader.php
* @adapted Llewellyn van der Merwe <https://git.vdm.dev/Llewellyn>
*
* @copyright (C) 2005 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
**/
defined('LPATH_PLATFORM') or die;
/**
* Static class to handle loading of libraries.
*
* @since 1.0.0
*/
abstract class LLoader
{
/**
* Container for already imported library paths.
*
* @var array
* @since 1.7.0
*/
protected static $classes = array();
/**
* Container for already imported library paths.
*
* @var array
* @since 1.7.0
*/
protected static $imported = array();
/**
* Container for registered library class prefixes and path lookups.
*
* @var array
* @since 3.0.0
*/
protected static $prefixes = array();
/**
* Holds proxy classes and the class names the proxy.
*
* @var array
* @since 3.2
*/
protected static $classAliases = array();
/**
* Holds the inverse lookup for proxy classes and the class names the proxy.
*
* @var array
* @since 3.4
*/
protected static $classAliasesInverse = array();
/**
* Container for namespace => path map.
*
* @var array
* @since 3.1.4
*/
protected static $namespaces = array();
/**
* Holds a reference for all deprecated aliases (mainly for use by a logging platform).
*
* @var array
* @since 3.6.3
*/
protected static $deprecatedAliases = array();
/**
* The root folders where extensions can be found.
*
* @var array
* @since 4.0.0
*/
protected static $extensionRootFolders = array();
/**
* Method to get the list of registered classes and their respective file paths for the autoloader.
*
* @return array The array of class => path values for the autoloader.
*
* @since 1.7.0
*/
public static function getClassList()
{
return self::$classes;
}
/**
* Method to get the list of deprecated class aliases.
*
* @return array An associative array with deprecated class alias data.
*
* @since 3.6.3
*/
public static function getDeprecatedAliases()
{
return self::$deprecatedAliases;
}
/**
* Method to get the list of registered namespaces.
*
* @return array The array of namespace => path values for the autoloader.
*
* @since 3.1.4
*/
public static function getNamespaces()
{
return self::$namespaces;
}
/**
* Load the file for a class.
*
* @param string $class The class to be loaded.
*
* @return boolean True on success
*
* @since 1.7.0
*/
public static function load($class)
{
// Sanitize class name.
$key = strtolower($class);
// If the class already exists do nothing.
if (class_exists($class, false))
{
return true;
}
// If the class is registered include the file.
if (isset(self::$classes[$key]))
{
$found = (bool) include_once self::$classes[$key];
if ($found)
{
self::loadAliasFor($class);
}
// If the class doesn't exists, we probably have a class alias available
if (!class_exists($class, false))
{
// Search the alias class, first none namespaced and then namespaced
$original = array_search($class, self::$classAliases) ? : array_search('\\' . $class, self::$classAliases);
// When we have an original and the class exists an alias should be created
if ($original && class_exists($original, false))
{
class_alias($original, $class);
}
}
return true;
}
return false;
}
/**
* Register a class prefix with lookup path. This will allow developers to register library
* packages with different class prefixes to the system autoloader. More than one lookup path
* may be registered for the same class prefix, but if this method is called with the reset flag
* set to true then any registered lookups for the given prefix will be overwritten with the current
* lookup path. When loaded, prefix paths are searched in a "last in, first out" order.
*
* @param string $prefix The class prefix to register.
* @param string $path Absolute file path to the library root where classes with the given prefix can be found.
* @param boolean $reset True to reset the prefix with only the given lookup path.
* @param boolean $prepend If true, push the path to the beginning of the prefix lookup paths array.
*
* @return void
*
* @throws RuntimeException
*
* @since 3.0.0
*/
public static function registerPrefix($prefix, $path, $reset = false, $prepend = false)
{
// Verify the library path exists.
if (!is_dir($path))
{
$path = (str_replace(LPATH_ROOT, '', $path) == $path) ? basename($path) : str_replace(LPATH_ROOT, '', $path);
throw new RuntimeException('Library path ' . $path . ' cannot be found.', 500);
}
// If the prefix is not yet registered or we have an explicit reset flag then set set the path.
if ($reset || !isset(self::$prefixes[$prefix]))
{
self::$prefixes[$prefix] = array($path);
}
// Otherwise we want to simply add the path to the prefix.
else
{
if ($prepend)
{
array_unshift(self::$prefixes[$prefix], $path);
}
else
{
self::$prefixes[$prefix][] = $path;
}
}
}
/**
* Offers the ability for "just in time" usage of `class_alias()`.
* You cannot overwrite an existing alias.
*
* @param string $alias The alias name to register.
* @param string $original The original class to alias.
* @param string|boolean $version The version in which the alias will no longer be present.
*
* @return boolean True if registration was successful. False if the alias already exists.
*
* @since 3.2
*/
public static function registerAlias($alias, $original, $version = false)
{
// PHP is case insensitive so support all kind of alias combination
$lowercasedAlias = strtolower($alias);
if (!isset(self::$classAliases[$lowercasedAlias]))
{
self::$classAliases[$lowercasedAlias] = $original;
$original = self::stripFirstBackslash($original);
if (!isset(self::$classAliasesInverse[$original]))
{
self::$classAliasesInverse[$original] = array($lowercasedAlias);
}
else
{
self::$classAliasesInverse[$original][] = $lowercasedAlias;
}
// If given a version, log this alias as deprecated
if ($version)
{
self::$deprecatedAliases[] = array('old' => $alias, 'new' => $original, 'version' => $version);
}
return true;
}
return false;
}
/**
* Register a namespace to the autoloader. When loaded, namespace paths are searched in a "last in, first out" order.
*
* @param string $namespace A case sensitive Namespace to register.
* @param string $path A case sensitive absolute file path to the library root where classes of the given namespace can be found.
* @param boolean $reset True to reset the namespace with only the given lookup path.
* @param boolean $prepend If true, push the path to the beginning of the namespace lookup paths array.
*
* @return void
*
* @throws RuntimeException
*
* @since 3.1.4
*/
public static function registerNamespace($namespace, $path, $reset = false, $prepend = false)
{
// Verify the library path exists.
if (!is_dir($path))
{
$path = (str_replace(LPATH_ROOT, '', $path) == $path) ? basename($path) : str_replace(LPATH_ROOT, '', $path);
throw new RuntimeException('Library path ' . $path . ' cannot be found.', 500);
}
// Trim leading and trailing backslashes from namespace, allowing "\Parent\Child", "Parent\Child\" and "\Parent\Child\" to be treated the same way.
$namespace = trim($namespace, '\\');
// If the namespace is not yet registered or we have an explicit reset flag then set the path.
if ($reset || !isset(self::$namespaces[$namespace]))
{
self::$namespaces[$namespace] = array($path);
}
// Otherwise we want to simply add the path to the namespace.
else
{
if ($prepend)
{
array_unshift(self::$namespaces[$namespace], $path);
}
else
{
self::$namespaces[$namespace][] = $path;
}
}
}
/**
* Method to setup the autoloaders for the Sport Stars Platform.
* Since the SPL autoloaders are called in a queue we will add our explicit
* class-registration based loader first, then fall back on the autoloader based on conventions.
* This will allow people to register a class in a specific location and override platform libraries
* as was previously possible.
*
* @param boolean $enablePsr True to enable autoloading based on PSR-0.
* @param boolean $enablePrefixes True to enable prefix based class loading (needed to auto load the Sport Stars core).
* @param boolean $enableClasses True to enable class map based class loading (needed to auto load the Sport Stars core).
*
* @return void
*
* @since 3.1.4
*/
public static function setup($enablePsr = true, $enablePrefixes = true, $enableClasses = true)
{
if ($enableClasses)
{
// Register the class map based autoloader.
spl_autoload_register(array('LLoader', 'load'));
}
if ($enablePrefixes)
{
// Register the prefix autoloader.
spl_autoload_register(array('LLoader', '_autoload'));
}
if ($enablePsr)
{
// Register the PSR based autoloader.
spl_autoload_register(array('LLoader', 'loadByPsr'));
spl_autoload_register(array('LLoader', 'loadByAlias'));
}
}
/**
* Method to autoload classes that are namespaced to the PSR-4 standard.
*
* @param string $class The fully qualified class name to autoload.
*
* @return boolean True on success, false otherwise.
*
* @since 3.7.0
* @deprecated 5.0 Use LLoader::loadByPsr instead
*/
public static function loadByPsr4($class)
{
return self::loadByPsr($class);
}
/**
* Method to autoload classes that are namespaced to the PSR-4 standard.
*
* @param string $class The fully qualified class name to autoload.
*
* @return boolean True on success, false otherwise.
*
* @since 4.0.0
*/
public static function loadByPsr($class)
{
$class = self::stripFirstBackslash($class);
// Find the location of the last NS separator.
$pos = strrpos($class, '\\');
// If one is found, we're dealing with a NS'd class.
if ($pos !== false)
{
$classPath = str_replace('\\', DIRECTORY_SEPARATOR, substr($class, 0, $pos)) . DIRECTORY_SEPARATOR;
$className = substr($class, $pos + 1);
}
// If not, no need to parse path.
else
{
$classPath = null;
$className = $class;
}
$classPath .= $className . '.php';
// Loop through registered namespaces until we find a match.
foreach (self::$namespaces as $ns => $paths)
{
if (strpos($class, "{$ns}\\") === 0)
{
$nsPath = trim(str_replace('\\', DIRECTORY_SEPARATOR, $ns), DIRECTORY_SEPARATOR);
// Loop through paths registered to this namespace until we find a match.
foreach ($paths as $path)
{
$classFilePath = realpath($path . DIRECTORY_SEPARATOR . substr_replace($classPath, '', 0, strlen($nsPath) + 1));
// We do not allow files outside the namespace root to be loaded
if (strpos($classFilePath, realpath($path)) !== 0)
{
continue;
}
// We check for class_exists to handle case-sensitive file systems
if (is_file($classFilePath) && !class_exists($class, false))
{
$found = (bool) include_once $classFilePath;
if ($found)
{
self::loadAliasFor($class);
}
return $found;
}
}
}
}
return false;
}
/**
* Method to autoload classes that have been aliased using the registerAlias method.
*
* @param string $class The fully qualified class name to autoload.
*
* @return boolean True on success, false otherwise.
*
* @since 3.2
*/
public static function loadByAlias($class)
{
$class = strtolower(self::stripFirstBackslash($class));
if (isset(self::$classAliases[$class]))
{
// Force auto-load of the regular class
class_exists(self::$classAliases[$class], true);
// Normally this shouldn't execute as the autoloader will execute applyAliasFor when the regular class is
// auto-loaded above.
if (!class_exists($class, false) && !interface_exists($class, false))
{
class_alias(self::$classAliases[$class], $class);
}
}
}
/**
* Applies a class alias for an already loaded class, if a class alias was created for it.
*
* @param string $class We'll look for and register aliases for this (real) class name
*
* @return void
*
* @since 3.4
*/
public static function applyAliasFor($class)
{
$class = self::stripFirstBackslash($class);
if (isset(self::$classAliasesInverse[$class]))
{
foreach (self::$classAliasesInverse[$class] as $alias)
{
class_alias($class, $alias);
}
}
}
/**
* Autoload a class based on name.
*
* @param string $class The class to be loaded.
*
* @return boolean True if the class was loaded, false otherwise.
*
* @since 1.7.3
*/
public static function _autoload($class)
{
foreach (self::$prefixes as $prefix => $lookup)
{
$chr = strlen($prefix) < strlen($class) ? $class[strlen($prefix)] : 0;
if (strpos($class, $prefix) === 0 && ($chr === strtoupper($chr)))
{
return self::_load(substr($class, strlen($prefix)), $lookup);
}
}
return false;
}
/**
* Load a class based on name and lookup array.
*
* @param string $class The class to be loaded (without prefix).
* @param array $lookup The array of base paths to use for finding the class file.
*
* @return boolean True if the class was loaded, false otherwise.
*
* @since 3.0.0
*/
private static function _load($class, $lookup)
{
// Split the class name into parts separated by camelCase.
$parts = preg_split('/(?<=[a-z0-9])(?=[A-Z])/x', $class);
$partsCount = count($parts);
foreach ($lookup as $base)
{
// Generate the path based on the class name parts.
$path = realpath($base . '/' . implode('/', array_map('strtolower', $parts)) . '.php');
// Load the file if it exists and is in the lookup path.
if (strpos($path, realpath($base)) === 0 && is_file($path))
{
$found = (bool) include_once $path;
if ($found)
{
self::loadAliasFor($class);
}
return $found;
}
// Backwards compatibility patch
// If there is only one part we want to duplicate that part for generating the path.
if ($partsCount === 1)
{
// Generate the path based on the class name parts.
$path = realpath($base . '/' . implode('/', array_map('strtolower', array($parts[0], $parts[0]))) . '.php');
// Load the file if it exists and is in the lookup path.
if (strpos($path, realpath($base)) === 0 && is_file($path))
{
$found = (bool) include_once $path;
if ($found)
{
self::loadAliasFor($class);
}
return $found;
}
}
}
return false;
}
/**
* Loads the aliases for the given class.
*
* @param string $class The class.
*
* @return void
*
* @since 3.8.0
*/
private static function loadAliasFor($class)
{
if (!array_key_exists($class, self::$classAliasesInverse))
{
return;
}
foreach (self::$classAliasesInverse[$class] as $alias)
{
// Force auto-load of the alias class
class_exists($alias, true);
}
}
/**
* Strips the first backslash from the given class if present.
*
* @param string $class The class to strip the first prefix from.
*
* @return string The striped class name.
*
* @since 3.8.0
*/
private static function stripFirstBackslash($class)
{
return $class && $class[0] === '\\' ? substr($class, 1) : $class;
}
}