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Extension_Loader.php
169 lines
| 1 | <?php |
| 2 | defined( 'WPINC' ) || die; // Do not load directly. |
| 3 | |
| 4 | /** |
| 5 | * Class Tribe__Extension_Loader |
| 6 | */ |
| 7 | class Tribe__Extension_Loader { |
| 8 | |
| 9 | /** |
| 10 | * Plugin header data |
| 11 | * |
| 12 | * @var array { |
| 13 | * Plugin header data |
| 14 | * |
| 15 | * @param array $plugin_basename Plugin header key/value pairs. |
| 16 | * } |
| 17 | */ |
| 18 | private $plugin_data = []; |
| 19 | |
| 20 | /** |
| 21 | * Class instance. |
| 22 | * |
| 23 | * @var Tribe__Extension_Loader The singleton instance. |
| 24 | */ |
| 25 | private static $instance; |
| 26 | |
| 27 | /** |
| 28 | * Returns the singleton instance of this class. |
| 29 | * |
| 30 | * @return Tribe__Extension_Loader instance. |
| 31 | */ |
| 32 | public static function instance() { |
| 33 | return null === self::$instance ? new self() : self::$instance; |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * Intializes each extension. |
| 38 | */ |
| 39 | private function __construct() { |
| 40 | $prefixes = self::get_extension_file_prefixes(); |
| 41 | $extension_filepaths = Tribe__Utils__Plugins::get_plugins_with_prefix( $prefixes ); |
| 42 | |
| 43 | foreach ( $extension_filepaths as $plugin_file ) { |
| 44 | $this->instantiate_extension( $plugin_file ); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Gets tribe extension plugin foldername prefixes |
| 50 | * |
| 51 | * @return array Prefixes |
| 52 | */ |
| 53 | public static function get_extension_file_prefixes() { |
| 54 | $prefixes = [ 'tribe-ext-' ]; |
| 55 | |
| 56 | /** |
| 57 | * Filter which plugin folder prefixes are considered tribe extensions. |
| 58 | * |
| 59 | * @param array $prefixes Extension plugin folder name prefixes. |
| 60 | */ |
| 61 | return apply_filters( 'tribe_extension_prefixes', $prefixes ); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Instantiates an extension based on info in its plugin file header. |
| 66 | * |
| 67 | * @param string $plugin_file Full path to extension's plugin file header. |
| 68 | * |
| 69 | * @return bool Indicates if extension was instantiated successfully. |
| 70 | */ |
| 71 | public function instantiate_extension( $plugin_file ) { |
| 72 | $p_data = $this->get_cached_plugin_data( $plugin_file ); |
| 73 | $p_folder = trailingslashit( dirname( $plugin_file ) ); |
| 74 | $success = false; |
| 75 | |
| 76 | // Nothing to instantiate if class is not set. |
| 77 | if ( empty( $p_data['ExtensionClass'] ) ) { |
| 78 | return $success; |
| 79 | } |
| 80 | |
| 81 | // Default to plugin file when empty. |
| 82 | $class_file = ! empty( $p_data['ExtensionFile'] ) ? $p_folder . $p_data['ExtensionFile'] : $plugin_file; |
| 83 | |
| 84 | // Include file. |
| 85 | if ( file_exists( $class_file ) ) { |
| 86 | // Prevent loading class twice in edge cases where require_once wouldn't work. |
| 87 | if ( ! class_exists( $p_data['ExtensionClass'] ) ) { |
| 88 | require( $class_file ); |
| 89 | } |
| 90 | } else { |
| 91 | _doing_it_wrong( |
| 92 | esc_html( $class_file ), |
| 93 | 'Extension file does not exist, please specify valid extension file.', |
| 94 | '4.3' |
| 95 | ); |
| 96 | } |
| 97 | |
| 98 | // Class instantiation. |
| 99 | if ( class_exists( $p_data['ExtensionClass'] ) ) { |
| 100 | $extension_args = [ |
| 101 | 'file' => $plugin_file, |
| 102 | 'plugin_data' => $p_data, |
| 103 | ]; |
| 104 | |
| 105 | // Instantiates extension instance. |
| 106 | $extension = call_user_func( |
| 107 | [ $p_data['ExtensionClass'], 'instance' ], |
| 108 | $p_data['ExtensionClass'], |
| 109 | $extension_args |
| 110 | ); |
| 111 | |
| 112 | if ( null !== $extension ) { |
| 113 | $success = true; |
| 114 | } |
| 115 | } else { |
| 116 | _doing_it_wrong( |
| 117 | esc_html( $p_data['ExtensionClass'] ), |
| 118 | 'Specified extension class does not exist. Please double check that this class is declared in the extension file.', |
| 119 | '4.3' |
| 120 | ); |
| 121 | } |
| 122 | |
| 123 | return $success; |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Retrieves plugin data from cache if it exists. |
| 128 | * |
| 129 | * @param string $plugin_path Path to plugin header file. |
| 130 | * |
| 131 | * @return array|null Plugin data or null. |
| 132 | */ |
| 133 | public function get_cached_plugin_data( $plugin_path ) { |
| 134 | $plugin_basename = plugin_basename( $plugin_path ); |
| 135 | |
| 136 | if ( ! array_key_exists( $plugin_basename, $this->plugin_data ) ) { |
| 137 | $this->plugin_data[ $plugin_basename ] = Tribe__Utils__Plugins::get_plugin_data( $plugin_path ); |
| 138 | } |
| 139 | |
| 140 | return $this->plugin_data[ $plugin_basename ]; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Prevent cloning the singleton with 'clone' operator |
| 145 | * |
| 146 | * @return void |
| 147 | */ |
| 148 | public function __clone() { |
| 149 | _doing_it_wrong( |
| 150 | __FUNCTION__, |
| 151 | 'Can not use this method on singletons.', |
| 152 | '4.3' |
| 153 | ); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Prevent unserializing the singleton instance |
| 158 | * |
| 159 | * @return void |
| 160 | */ |
| 161 | public function __wakeup() { |
| 162 | _doing_it_wrong( |
| 163 | __FUNCTION__, |
| 164 | 'Can not use this method on singletons.', |
| 165 | '4.3' |
| 166 | ); |
| 167 | } |
| 168 | } |
| 169 |