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123 lines
3.4 KiB
123 lines
3.4 KiB
<?php
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/**
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* @author http://php-fig.org/ <info@php-fig.org>
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* @site https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md
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*/
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class Psr4AutoloaderClass {
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/**
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* An 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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*
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* @var array
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*/
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protected $prefixes = [];
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/**
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* Register loader with SPL autoloader stack.
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*
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* @return void
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*/
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public function register() {
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spl_autoload_register(array($this, 'load_class'));
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}
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public function is_loaded(string $prefix): bool {
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$prefix = trim($prefix, '\\') . '\\';
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return (isset($this->prefixes[$prefix])) ? true : false;
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}
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public function get_list(): array {
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return $this->prefixes;
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}
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/**
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* Adds a base directory for a namespace prefix.
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*
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* @param string $prefix The namespace prefix.
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* @param string $base_dir A base directory for class files in the
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* namespace.
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* @param bool $prepend If true, prepend the base directory to the stack
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* instead of appending it; this causes it to be searched first rather
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* than last.
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* @return void
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*/
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public function add_namespace(string $prefix, string $base_dir, bool $prepend = false): void {
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$prefix = trim($prefix, '\\') . '\\';
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$base_dir = rtrim($base_dir, DIRECTORY_SEPARATOR) . '/';
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if (isset($this->prefixes[$prefix]) === false) {
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$this->prefixes[$prefix] = array();
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}
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if ($prepend) {
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array_unshift($this->prefixes[$prefix], $base_dir);
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} else {
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array_push($this->prefixes[$prefix], $base_dir);
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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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*
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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
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* failure.
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*/
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public function load_class(string $class) {
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/**
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* Semi-Fix for non-namespaced classes
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*/
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if (! strrpos($class, '\\')) {
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return ($this->load_mapped_file($class . '\\', $class));
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}
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$prefix = $class;
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while (false !== $pos = strrpos($prefix, '\\')) {
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$prefix = substr($class, 0, $pos + 1);
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$relative_class = substr($class, $pos + 1);
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$mapped_file = $this->load_mapped_file($prefix, $relative_class);
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if ($mapped_file) {
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return $mapped_file;
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}
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$prefix = rtrim($prefix, '\\');
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}
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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 relative class.
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*
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* @param string $prefix The namespace prefix.
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* @param string $relative_class The relative class name.
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* @return mixed Boolean false if no mapped file can be loaded, or the
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* name of the mapped file that was loaded.
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*/
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protected function load_mapped_file(string $prefix, string $relative_class) {
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if (isset($this->prefixes[$prefix]) === false) {
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return false;
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}
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foreach ($this->prefixes[$prefix] as $base_dir) {
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$file = $base_dir
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. str_replace('\\', '/', $relative_class)
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. '.php';
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if ($this->require_file($file)) {
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return $file;
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}
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}
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return false;
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}
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/**
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* If a file exists, require it from the file system.
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*
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* @param string $file The file to require.
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* @return bool True if the file exists, false if not.
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*/
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protected function require_file(string $file): bool {
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if (file_exists($file)) {
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require $file;
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return true;
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}
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return false;
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}
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}
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