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<?php

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namespace EmbedPress;

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(defined('ABSPATH') && defined('EMBEDPRESS_IS_LOADED')) or die("No direct script access allowed.");

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/**

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* Entity responsible for autoloading classes using the PSR-4 pattern.

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* @package EmbedPress

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* @author EmbedPress <help@embedpress.com>

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* @license GPLv3 or later

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* @since 1.0.0

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class AutoLoader

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{

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/**

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* Associative array where the key is a namespace prefix and the value

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* is an array of base directories for classes in that namespace.

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* @since 1.0.0

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* @access protected

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* @static

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* @var array

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protected static $prefixes = [];

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/**

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* Associative array of prefixes for loading specialized camelCase classes

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* where Uppercase letters in the class name indicate directory structure

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* @since 1.0.0

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* @access protected

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* @static

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* @var array

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protected static $camelPrefixes = [];

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/**

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* @since 1.0.0

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* @access protected

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* @static

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* @var AutoLoader

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protected static $instance = null;

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/**

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* Register a new loader.

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* @since 1.0.0

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* @access protected

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* @static

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* @param string $method The method name which will be called.

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* @return void

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protected static function registerLoader($method)

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{

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if (static::$instance === null) {

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static::$instance = new static();

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}

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spl_autoload_register([static::$instance, $method]);

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}

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/**

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* Register a psr4 namespace

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* @since 1.0.0

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* @static

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* @param string $prefix The namespace prefix.

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* @param string $baseDir A base directory for class files in the namespace.

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* @param bool $prepend If true, prepend the base directory to the stack instead of

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* appending it; this causes it to be searched first rather than last.

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* @return void

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public static function register($prefix = null, $baseDir = null, $prepend = false)

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{

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if ($prefix === null || $baseDir === null) {

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// Recognize old-style instantiations for backward compatibility

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return;

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}

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if (count(self::$prefixes) == 0) {

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// Register function on first call

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static::registerLoader('loadClass');

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}

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// normalize namespace prefix

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$prefix = trim($prefix, '\\') . '\\';

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// normalize the base directory with a trailing separator

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$baseDir = rtrim($baseDir, '\\/') . '/';

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// initialise the namespace prefix array

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if (empty(self::$prefixes[$prefix])) {

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self::$prefixes[$prefix] = [];

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}

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// retain the base directory for the namespace prefix

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if ($prepend) {

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array_unshift(self::$prefixes[$prefix], $baseDir);

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} else {

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array_push(self::$prefixes[$prefix], $baseDir);

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}

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}

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/**

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* Loads the class file for a given class name.

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* @since 1.0.0

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* @access protected

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* @static

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* @param string $class The fully-qualified class name.

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* @return mixed The mapped file name on success, or boolean false on failure.

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protected function loadClass($class)

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{

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$prefixes = explode('\\', $class);

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$className = '';

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while ($prefixes) {

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$className = array_pop($prefixes) . $className;

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$prefix = join('\\', $prefixes) . '\\';

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if ($filePath = $this->loadMappedFile($prefix, $className)) {

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return $filePath;

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}

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$className = '\\' . $className;

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}

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// never found a mapped file

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return false;

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}

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/**

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* Load the mapped file for a namespace prefix and class.

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* @since 1.0.0

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* @access protected

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* @static

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* @param string $prefix The namespace prefix.

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* @param string $className The relative class name.

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* @return mixed False if no mapped file can be loaded | path that was loaded

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protected function loadMappedFile($prefix, $className)

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{

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// are there any base directories for this namespace prefix?

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if (isset(self::$prefixes[$prefix]) === false) {

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return false;

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}

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// look through base directories for this namespace prefix

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foreach (self::$prefixes[$prefix] as $baseDir) {

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$path = $baseDir . str_replace('\\', '/', $className) . '.php';

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if (is_file($path)) {

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require_once $path;

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return $path;

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}

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}

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// never found it

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return false;

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}

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/**

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* Register a base directory for classes organized using camelCase.

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* Class names beginning with the prefix will be automatically loaded

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* if there is a matching file in the directory tree starting with $baseDir.

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* File names and directory names are all expected to be lower case.

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* @since 1.0.0

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* @static

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* @param string $prefix

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* @param string $baseDir

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* @return void

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* @throws \Exception

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public static function registerCamelBase($prefix, $baseDir)

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{

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if ( ! is_dir($baseDir)) {

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throw new \Exception("Cannot register '{$prefix}'. The requested base directory does not exist!'");

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}

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if (count(self::$camelPrefixes) == 0) {

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// Register function on first call

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static::registerLoader('loadCamelClass');

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}

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if (empty(self::$camelPrefixes[$prefix])) {

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self::$camelPrefixes[$prefix] = $baseDir;

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}

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}

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/**

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* Autoload a class using the camelCase structure

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* @since 1.0.0

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* @access protected

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* @param string $class

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* @return mixed Bool/string

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protected function loadCamelClass($class)

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{

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if ( ! class_exists($class)) {

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foreach (self::$camelPrefixes as $prefix => $baseDir) {

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if (strpos($class, $prefix) === 0) {

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$parts = preg_split('/(?<=[a-z])(?=[A-Z])/x', substr($class, strlen($prefix)));

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$file = strtolower(join('/', $parts));

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$filePath = $baseDir . '/' . $file . '.php';

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if (is_file($filePath)) {

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require_once $filePath;

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return $filePath;

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}

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}

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}

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}

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// No file found

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return false;

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}

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}

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