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7 years ago
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ThirdParty
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AutoLoader.php
7 years ago
Compatibility.php
7 years ago
Core.php
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AutoLoader.php
242 lines
| 1 | <?php |
| 2 | |
| 3 | namespace EmbedPress; |
| 4 | |
| 5 | (defined('ABSPATH') && defined('EMBEDPRESS_IS_LOADED')) or die("No direct script access allowed."); |
| 6 | |
| 7 | /** |
| 8 | * Entity responsible for autoloading classes using the PSR-4 pattern. |
| 9 | * |
| 10 | * @package EmbedPress |
| 11 | * @author EmbedPress <help@embedpress.com> |
| 12 | * @copyright Copyright (C) 2018 EmbedPress. All rights reserved. |
| 13 | * @license GPLv2 or later |
| 14 | * @since 1.0.0 |
| 15 | */ |
| 16 | class AutoLoader |
| 17 | { |
| 18 | /** |
| 19 | * Associative array where the key is a namespace prefix and the value |
| 20 | * is an array of base directories for classes in that namespace. |
| 21 | * |
| 22 | * @since 1.0.0 |
| 23 | * @access protected |
| 24 | * @static |
| 25 | * |
| 26 | * @var array |
| 27 | */ |
| 28 | protected static $prefixes = []; |
| 29 | |
| 30 | /** |
| 31 | * Associative array of prefixes for loading specialized camelCase classes |
| 32 | * where Uppercase letters in the class name indicate directory structure |
| 33 | * |
| 34 | * @since 1.0.0 |
| 35 | * @access protected |
| 36 | * @static |
| 37 | * |
| 38 | * @var array |
| 39 | */ |
| 40 | protected static $camelPrefixes = []; |
| 41 | |
| 42 | /** |
| 43 | * @since 1.0.0 |
| 44 | * @access protected |
| 45 | * @static |
| 46 | * |
| 47 | * @var AutoLoader |
| 48 | */ |
| 49 | protected static $instance = null; |
| 50 | |
| 51 | /** |
| 52 | * Register a new loader. |
| 53 | * |
| 54 | * @since 1.0.0 |
| 55 | * @access protected |
| 56 | * @static |
| 57 | * |
| 58 | * @param string $method The method name which will be called. |
| 59 | * |
| 60 | * @return void |
| 61 | */ |
| 62 | protected static function registerLoader($method) |
| 63 | { |
| 64 | if (static::$instance === null) { |
| 65 | static::$instance = new static(); |
| 66 | } |
| 67 | |
| 68 | spl_autoload_register([static::$instance, $method]); |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Register a psr4 namespace |
| 73 | * |
| 74 | * @since 1.0.0 |
| 75 | * @static |
| 76 | * |
| 77 | * @param string $prefix The namespace prefix. |
| 78 | * @param string $baseDir A base directory for class files in the namespace. |
| 79 | * @param bool $prepend If true, prepend the base directory to the stack instead of |
| 80 | * appending it; this causes it to be searched first rather than last. |
| 81 | * |
| 82 | * @return void |
| 83 | */ |
| 84 | public static function register($prefix = null, $baseDir = null, $prepend = false) |
| 85 | { |
| 86 | if ($prefix === null || $baseDir === null) { |
| 87 | // Recognize old-style instantiations for backward compatibility |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | if (count(self::$prefixes) == 0) { |
| 92 | // Register function on first call |
| 93 | static::registerLoader('loadClass'); |
| 94 | } |
| 95 | |
| 96 | // normalize namespace prefix |
| 97 | $prefix = trim($prefix, '\\') . '\\'; |
| 98 | |
| 99 | // normalize the base directory with a trailing separator |
| 100 | $baseDir = rtrim($baseDir, '\\/') . '/'; |
| 101 | |
| 102 | // initialise the namespace prefix array |
| 103 | if (empty(self::$prefixes[$prefix])) { |
| 104 | self::$prefixes[$prefix] = []; |
| 105 | } |
| 106 | |
| 107 | // retain the base directory for the namespace prefix |
| 108 | if ($prepend) { |
| 109 | array_unshift(self::$prefixes[$prefix], $baseDir); |
| 110 | } else { |
| 111 | array_push(self::$prefixes[$prefix], $baseDir); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Loads the class file for a given class name. |
| 117 | * |
| 118 | * @since 1.0.0 |
| 119 | * @access protected |
| 120 | * @static |
| 121 | * |
| 122 | * @param string $class The fully-qualified class name. |
| 123 | * |
| 124 | * @return mixed The mapped file name on success, or boolean false on failure. |
| 125 | */ |
| 126 | protected function loadClass($class) |
| 127 | { |
| 128 | $prefixes = explode('\\', $class); |
| 129 | $className = ''; |
| 130 | while ($prefixes) { |
| 131 | $className = array_pop($prefixes) . $className; |
| 132 | $prefix = join('\\', $prefixes) . '\\'; |
| 133 | |
| 134 | if ($filePath = $this->loadMappedFile($prefix, $className)) { |
| 135 | return $filePath; |
| 136 | } |
| 137 | $className = '\\' . $className; |
| 138 | } |
| 139 | |
| 140 | // never found a mapped file |
| 141 | return false; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Load the mapped file for a namespace prefix and class. |
| 146 | * |
| 147 | * @since 1.0.0 |
| 148 | * @access protected |
| 149 | * @static |
| 150 | * |
| 151 | * @param string $prefix The namespace prefix. |
| 152 | * @param string $className The relative class name. |
| 153 | * |
| 154 | * @return mixed False if no mapped file can be loaded | path that was loaded |
| 155 | */ |
| 156 | protected function loadMappedFile($prefix, $className) |
| 157 | { |
| 158 | // are there any base directories for this namespace prefix? |
| 159 | if (isset(self::$prefixes[$prefix]) === false) { |
| 160 | return false; |
| 161 | } |
| 162 | |
| 163 | // look through base directories for this namespace prefix |
| 164 | foreach (self::$prefixes[$prefix] as $baseDir) { |
| 165 | $path = $baseDir . str_replace('\\', '/', $className) . '.php'; |
| 166 | |
| 167 | if (is_file($path)) { |
| 168 | require_once $path; |
| 169 | |
| 170 | return $path; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | // never found it |
| 175 | return false; |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Register a base directory for classes organized using camelCase. |
| 180 | * Class names beginning with the prefix will be automatically loaded |
| 181 | * if there is a matching file in the directory tree starting with $baseDir. |
| 182 | * File names and directory names are all expected to be lower case. |
| 183 | * |
| 184 | * @since 1.0.0 |
| 185 | * @static |
| 186 | * |
| 187 | * @param string $prefix |
| 188 | * @param string $baseDir |
| 189 | * |
| 190 | * @return void |
| 191 | * @throws \Exception |
| 192 | */ |
| 193 | public static function registerCamelBase($prefix, $baseDir) |
| 194 | { |
| 195 | if ( ! is_dir($baseDir)) { |
| 196 | throw new \Exception("Cannot register '{$prefix}'. The requested base directory does not exist!'"); |
| 197 | } |
| 198 | |
| 199 | if (count(self::$camelPrefixes) == 0) { |
| 200 | // Register function on first call |
| 201 | static::registerLoader('loadCamelClass'); |
| 202 | } |
| 203 | |
| 204 | if (empty(self::$camelPrefixes[$prefix])) { |
| 205 | self::$camelPrefixes[$prefix] = $baseDir; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Autoload a class using the camelCase structure |
| 211 | * |
| 212 | * @since 1.0.0 |
| 213 | * @access protected |
| 214 | * |
| 215 | * @param string $class |
| 216 | * |
| 217 | * @return mixed Bool/string |
| 218 | */ |
| 219 | protected function loadCamelClass($class) |
| 220 | { |
| 221 | if ( ! class_exists($class)) { |
| 222 | foreach (self::$camelPrefixes as $prefix => $baseDir) { |
| 223 | if (strpos($class, $prefix) === 0) { |
| 224 | $parts = preg_split('/(?<=[a-z])(?=[A-Z])/x', substr($class, strlen($prefix))); |
| 225 | |
| 226 | $file = strtolower(join('/', $parts)); |
| 227 | $filePath = $baseDir . '/' . $file . '.php'; |
| 228 | |
| 229 | if (is_file($filePath)) { |
| 230 | require_once $filePath; |
| 231 | |
| 232 | return $filePath; |
| 233 | } |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | // No file found |
| 239 | return false; |
| 240 | } |
| 241 | } |
| 242 |