WPStore /
wp-autoloader
| 1 | <?php |
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introduced
by
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| 2 | /** |
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| 3 | * @author WPStore.io <[email protected]> |
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| 4 | * @copyright Copyright (c) 2017-2018, WPStore.io |
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| 5 | * @license https://spdx.org/licenses/MIT.html MIT |
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| 97 | /** |
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| 98 | * Register loader with SPL autoloader stack. |
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| 99 | * |
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| 100 | * @throws \Exception |
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| 101 | */ |
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| 102 | public function register() { |
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| 103 | spl_autoload_register( array( $this, 'loadClass' ) ); |
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| 104 | } |
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| 105 | |||
| 106 | /** |
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| 107 | * Adds a base directory for a namespace prefix. |
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| 109 | * @param string $prefix The namespace prefix. |
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| 110 | * @param string $base_dir A base directory for class files in the |
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| 111 | * namespace. |
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| 112 | * @param bool $prepend If true, prepend the base directory to the stack |
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| 113 | * instead of appending it; this causes it to be searched first rather |
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| 114 | * than last. |
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| 115 | * |
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| 116 | * @return void |
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| 117 | */ |
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| 118 | public function addNamespace( $prefix, $base_dir, $prepend = false ) { |
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| 119 | /** normalize namespace prefix */ |
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| 120 | $prefix = trim( $prefix, '\\' ) . '\\'; |
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| 121 | |||
| 122 | /** normalize the base directory with a trailing separator */ |
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| 123 | $base_dir = rtrim( $base_dir, DIRECTORY_SEPARATOR ) . '/'; |
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| 124 | |||
| 125 | /** initialize the namespace prefix array */ |
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| 126 | if ( isset( $this->prefixes[ $prefix ] ) === false ) { |
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| 127 | $this->prefixes[ $prefix ] = array(); |
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| 128 | } |
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| 129 | |||
| 130 | /** retain the base directory for the namespace prefix */ |
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| 131 | if ( $prepend ) { |
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| 132 | array_unshift( $this->prefixes[ $prefix ], $base_dir ); |
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| 133 | } else { |
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| 134 | array_push( $this->prefixes[ $prefix ], $base_dir ); |
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| 135 | } |
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| 136 | } |
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| 137 | |||
| 138 | /** |
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| 139 | * Loads the class file for a given class name. |
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| 143 | * @return mixed The mapped file name on success, or boolean false on |
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| 144 | * failure. |
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| 145 | */ |
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| 146 | public function loadClass( $class ) { |
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| 147 | // the current namespace prefix |
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| 148 | $prefix = $class; |
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| 149 | |||
| 150 | // work backwards through the namespace names of the fully-qualified |
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| 151 | // class name to find a mapped file name |
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| 152 | while ( false !== $pos = strrpos( $prefix, '\\' ) ) { |
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| 153 | |||
| 154 | // retain the trailing namespace separator in the prefix |
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| 155 | $prefix = substr( $class, 0, $pos + 1 ); |
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| 156 | |||
| 157 | // the rest is the relative class name |
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| 158 | $relative_class = substr( $class, $pos + 1 ); |
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| 159 | |||
| 160 | // try to load a mapped file for the prefix and relative class |
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| 161 | $mapped_file = $this->loadMappedFile( $prefix, $relative_class ); |
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| 162 | if ( $mapped_file ) { |
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| 163 | return $mapped_file; |
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| 164 | } |
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| 165 | |||
| 166 | // remove the trailing namespace separator for the next iteration |
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| 167 | // of strrpos() |
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| 168 | $prefix = rtrim( $prefix, '\\' ); |
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| 169 | } |
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| 170 | |||
| 171 | // never found a mapped file |
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| 172 | return false; |
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| 173 | } |
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| 174 | |||
| 175 | /** |
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| 176 | * Load the mapped file for a namespace prefix and relative class. |
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| 181 | * @return mixed Boolean false if no mapped file can be loaded, or the |
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| 182 | * name of the mapped file that was loaded. |
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| 183 | */ |
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| 184 | protected function loadMappedFile( $prefix, $relative_class ) { |
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| 185 | // are there any base directories for this namespace prefix? |
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| 186 | if ( isset( $this->prefixes[ $prefix ] ) === false ) { |
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| 187 | return false; |
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| 188 | } |
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| 189 | |||
| 190 | // look through base directories for this namespace prefix |
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| 191 | foreach ( $this->prefixes[ $prefix ] as $base_dir ) { |
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| 192 | |||
| 193 | /** |
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| 194 | * replace the namespace prefix with the base directory, |
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| 195 | * replace namespace separators with directory separators |
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| 196 | * in the relative class name, append with .php |
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| 197 | */ |
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| 198 | $file = $base_dir . str_replace( '\\', '/', $relative_class ) . '.php'; |
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| 199 | |||
| 200 | // if the mapped file exists, require it |
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| 201 | if ( $this->requireFile( $file ) ) { |
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| 202 | // yes, we're done |
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| 203 | return $file; |
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| 204 | } |
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| 205 | } |
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| 206 | |||
| 207 | // never found it |
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| 208 | return false; |
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| 209 | } |
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| 210 | |||
| 211 | /** |
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| 212 | * If a file exists, require it from the file system. |
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| 215 | * |
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| 216 | * @return bool True if the file exists, false if not. |
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| 217 | */ |
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| 218 | protected function requireFile( $file ) { |
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| 219 | if ( file_exists( $file ) ) { |
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| 220 | require $file; |
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| 221 | |||
| 223 | } |
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| 224 | |||
| 225 | return false; |
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| 226 | } |
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| 227 | |||
| 228 | } // END class |
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| 229 |
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