├── CHANGELOG.md ├── composer.json ├── inpsyde-translation-cache.php ├── README.md ├── src └── MoCache.php └── LICENSE /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | # Change Log 2 | All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/). 3 | 4 | ## [1.0.3](https://github.com/inpsyde/translation-cache/compare/1.0.2...1.0.) - 2019-01-21 5 | * Add parameter to make thrid param optional to avoid errors, #3 6 | 7 | ## [1.0.2](https://github.com/inpsyde/translation-cache/compare/1.0.1...1.0.2) - 2017-09-20 8 | * Fixed warning for undefined variable access when dropins replaced `wp_cache_get` with a signature different from core 9 | 10 | ## [1.0.1](https://github.com/inpsyde/translation-cache/compare/1.0.0...1.0.1) - 2016-10-31 11 | * Codestyles. 12 | 13 | ## 1.0.0 14 | * Initial Release. -------------------------------------------------------------------------------- /composer.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "inpsyde/translation-cache", 3 | "description": "Improves site performance by caching translation files using WordPress object cache.", 4 | "keywords": [ 5 | "wordpress", 6 | "cache", 7 | "caching", 8 | "performance", 9 | "mo file", 10 | "i18n", 11 | "internationalization", 12 | "l10n", 13 | "localization", 14 | "language", 15 | "languages", 16 | "translation", 17 | "translations", 18 | "translate" 19 | ], 20 | "type": "wordpress-plugin", 21 | "license": "gpl-2.0-or-later", 22 | "authors": [ 23 | { 24 | "name": "Inpsyde GmbH", 25 | "email": "hello@inpsyde.com", 26 | "homepage": "http://inpsyde.com", 27 | "role": "Company" 28 | }, 29 | { 30 | "name": "Giuseppe Mazzapica", 31 | "email": "giuseppe.mazzapica@gmail.com", 32 | "role": "Developer" 33 | }, 34 | { 35 | "name": "Masaki Takeuchi", 36 | "role": "Developer" 37 | } 38 | ], 39 | "minimum-stability": "stable", 40 | "require": { 41 | "php": ">=5.5" 42 | }, 43 | "autoload": { 44 | "psr-4": { 45 | "Inpsyde\\TranslationCache\\": "src/" 46 | } 47 | }, 48 | "config": { 49 | "optimize-autoloader": true 50 | } 51 | } 52 | -------------------------------------------------------------------------------- /inpsyde-translation-cache.php: -------------------------------------------------------------------------------- 1 | id ) { 95 | return; 96 | } 97 | 98 | $markup = '

%s

'; 99 | $format = 'Inpsyde Translation Cache can\'t install itself as MU plugin.
'; 100 | $format .= 'Please copy "%s" to "%s" to improve translation performance'; 101 | printf( $markup, sprintf( $format, __FILE__, trailingslashit( WPMU_PLUGIN_DIR ) . basename( __FILE__ ) ) ); 102 | } 103 | ); 104 | 105 | /* 106 | * When regular plugin is deactivated, but MU plugin is still there because deleting it failed, show an admin notice 107 | * telling users to manually delete the file from MU plugins folder, or in case it was edited, to removed the code that 108 | * show the notice. 109 | */ 110 | ( ! $is_regular_plugin && ! get_site_option( 'inpsyde-mocache-class-path' ) ) and add_action( 111 | 'all_admin_notices', 112 | function () { 113 | $line = __LINE__ - 3; 114 | 115 | $markup = '
%s
'; 116 | $msg = '

Inpsyde Translation Cache is installed as MU plugin without its "regular" plugin counterpart.

'; 117 | $msg .= '

Possible causes are:

'; 118 | $msg .= '
  1. was not possible to delete MU plugin on plugin deactivation
    2. '; 119 | $msg .= '
  2. the MU plugin was edited "manually" and preserved to avoid deleting custom work
'; 120 | $msg .= '

In the first case, please delete MU plugin file at %s '; 121 | $msg .= '(note it is not doing anything but showing this notice).

'; 122 | $msg .= '

In the second case, if the MU plugin was edited to do something without regular plugin, '; 123 | $msg .= 'you should probably also delete the code that shows this notice (starts around line %d).

'; 124 | printf( $markup, sprintf( $msg, __FILE__, $line ) ); 125 | } 126 | ); 127 | 128 | // When installed as MU plugin successfully, there's nothing more to do. 129 | if ( $is_regular_plugin && $is_loaded ) { 130 | unset( $is_regular_plugin, $is_loaded ); 131 | 132 | return; 133 | } 134 | 135 | // We need to check for existence because when copied to MU plugin this file is loaded twice. 136 | if ( ! function_exists( __NAMESPACE__ . '\\load_translation_cache' ) ) { 137 | 138 | /** 139 | * Bootstrap plugin routine. 140 | * 141 | * @wp-hook muplugins_loaded 142 | * @wp-hook plugins_loaded 143 | */ 144 | function load_translation_cache() { 145 | 146 | $class_missing = FALSE; 147 | 148 | if ( ! class_exists( MoCache::class ) ) { 149 | $class_missing = TRUE; 150 | $class_path = get_site_option( 'inpsyde-mocache-class-path' ); 151 | if ( $class_path && file_exists( $class_path ) && is_readable( $class_path ) ) { 152 | /** @noinspection PhpIncludeInspection */ 153 | require_once $class_path; 154 | } 155 | } 156 | 157 | if ( ! $class_missing || class_exists( MoCache::class ) ) { 158 | 159 | // Add plugin hooks, avoiding to add them more than once. 160 | $has_load = has_filter( 'override_load_textdomain', [ MoCache::class, 'load' ] ); 161 | $has_load or add_filter( 'override_load_textdomain', [ MoCache::class, 'load' ], 30, 3 ); 162 | 163 | $has_theme_switch = has_action( 'switch_theme', [ MoCache::class, 'on_theme_switch' ] ); 164 | $has_theme_switch or add_action( 'switch_theme', [ MoCache::class, 'on_theme_switch' ], 30, 3 ); 165 | 166 | $has_plugin_activated = has_action( 'activated_plugin', [ MoCache::class, 'on_plugin_switch' ] ); 167 | $has_plugin_activated or add_action( 'activated_plugin', [ MoCache::class, 'on_plugin_switch' ], 30 ); 168 | 169 | $has_plugin_deactivated = has_action( 'deactivate_plugin', [ MoCache::class, 'on_plugin_switch' ] ); 170 | $has_plugin_deactivated or add_action( 'deactivate_plugin', [ MoCache::class, 'on_plugin_switch' ], 30 ); 171 | 172 | $has_shutdown = has_action( 'shutdown', [ MoCache::class, 'sync_options' ] ); 173 | $has_shutdown or add_action( 'shutdown', [ MoCache::class, 'sync_options' ], 30 ); 174 | 175 | /** 176 | * Fires just after the plugin class has been discovered. 177 | * Useful to wrap calls to `Inpsyde\MoCache::flush_cache()` 178 | */ 179 | do_action( 'inpsyde_translation_cache' ); 180 | } 181 | } 182 | } 183 | 184 | /* 185 | * When installed as MU plugin, we lunch plugin workflow at 'muplugins_loaded'. 186 | * When self installation as MU plugin failed, run loading routine at 'plugins_loaded' as a fallback. 187 | */ 188 | add_action( 189 | $is_regular_plugin ? 'plugins_loaded' : 'muplugins_loaded', 190 | __NAMESPACE__ . '\\load_translation_cache', 191 | 0 192 | ); 193 | 194 | // Cleanup. 195 | unset( $is_regular_plugin, $is_loaded ); 196 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | Inpsyde Translation Cache 2 | ========================= 3 | 4 | > Improves site performance by caching translation files using WordPress object cache. 5 | 6 | ---- 7 | 8 | ## Description 9 | 10 | _'Inpsyde Translation Cache'_ provides caching of the translation `.mo` files using [WP Object Cache](http://codex.wordpress.org/Class_Reference/WP_Object_Cache) 11 | mechanism. 12 | 13 | Performance benefit of the plugin can be seen when using [persistent cache plugin](http://codex.wordpress.org/Class_Reference/WP_Object_Cache#Persistent_Cache_Plugins) 14 | because, by default, WordPress object cache does not 'survive' the single request and translation files are _already_ 15 | cached on a per-request basis in WP. 16 | 17 | For this reason **the plugin, by default, does nothing when there's no persistent caching plugin installed**. 18 | 19 | -------- 20 | 21 | ## MU plugin self-installation 22 | 23 | Considering that many plugins have their language files, to be allowed to cache plugins translations, _'Inpsyde Translation Cache'_ 24 | has to run as [MU plugin](https://codex.wordpress.org/Must_Use_Plugins). 25 | 26 | For this reason, **_'Inpsyde Translation Cache'_ copies its main file to the MU plugin folder on installation**, 27 | so it can work as MU plugin. 28 | 29 | The 'regular' plugin stays active though, but doing nothing, or better, it listed for deactivation to delete the MU 30 | plugin copy. 31 | 32 | In fact, when 'regular' plugin is deactivated, the MU plugin copy is deleted (unless it was modified). 33 | 34 | Please note that on some configurations this 'self-installation' routine may not work, e.g. if MU plugins folder is not 35 | writable. 36 | 37 | In those cases _'Inpsyde Translation Cache'_ will continue to work as a regular plugin, but it will not be able to cache 38 | translation files loaded before `'plugins_loaded'` hook is fired. Moreover, an admin notice is also shown to suggest users 39 | to manually copy main plugin file to MU plugins folder to improve performance. 40 | 41 | -------- 42 | 43 | ## Cache invalidation 44 | 45 | _'Inpsyde Translation Cache'_ stores all the text domains: 46 | 47 | - core 48 | - plugins 49 | - themes 50 | 51 | it means that when a new version of those is installed, the cache need to cleared. 52 | 53 | ### Automatic invalidation 54 | 55 | For invalidation of WordPress core translations the plugin relies on WordPress version: if that change all cached core 56 | translations are invalidated. 57 | 58 | For plugin and themes, things are less straightforward. 59 | 60 | _'Inpsyde Translation Cache'_ uses [`'switch_theme'`](https://developer.wordpress.org/reference/functions/switch_theme/) 61 | hook to invalidate cache of both the 'old' and the 'new' theme. 62 | 63 | It also uses [`'activated_plugin'`](https://developer.wordpress.org/reference/hooks/activated_plugin/) and 64 | [`'deactivated_plugin'`](https://developer.wordpress.org/reference/hooks/deactivated_plugin/) to invalidate cache for 65 | plugins. 66 | 67 | However, to invalidate cache of themes and plugins _'Inpsyde Translation Cache'_ needs to know the text domain they use. 68 | 69 | For that scope, _'Inpsyde Translation Cache'_ uses 'TextDomain' file header of plugin and themes. 70 | 71 | Considering that 'TextDomain' file header is not mandatory, it is possible that some plugins or themes that don't provide 72 | that header (even if they should). 73 | 74 | ### Manual invalidation 75 | 76 | In those cases it is possible to invalidate the cache 'manually' by calling `Inpsyde\MoCache::flush_cache()` method. 77 | 78 | For example, let's assume there's a plugin that loads a text domain like this: 79 | 80 | ```php 81 | load_plugin_textdomain( 'some-plugin-txt-domain', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' ); 82 | ``` 83 | 84 | and let's assume this plugin has **not** in plugin headers something like: 85 | 86 | ``` 87 | Text Domain: some-plugin-txt-domain 88 | ``` 89 | 90 | _'Inpsyde Translation Cache'_ will not be able to flush cache for that plugin automatically when activated and deactivated. 91 | 92 | However, 'manually' invalidating cache for that plugin would be just a matter of: 93 | 94 | ```php 95 | function invalidate_some_plugin_translation_cache() { 96 | if ( class_exists( 'Inpsyde\TranslationCache\MoCache' ) ) { 97 | Inpsyde\TranslationCache\MoCache::flush_cache( 'some-plugin-txt-domain' ); 98 | } 99 | } 100 | 101 | register_activation_hook( 102 | WP_PLUGIN_DIR . '/some-plugin-dir/some-plugin-filename.php', 103 | 'invalidate_some_plugin_translation_cache' 104 | ); 105 | 106 | register_deactivation_hook( 107 | WP_PLUGIN_DIR . '/some-plugin-dir/some-plugin-filename.php', 108 | 'invalidate_some_plugin_translation_cache' 109 | ); 110 | ``` 111 | 112 | Of course, when it is possible to edit the plugin to include the `Text Domain` plugin header, it is surely better, 113 | because _'Inpsyde Translation Cache'_ will be able to invalidate the cache for plugin translations automatically. 114 | 115 | For themes the workflow is very similar, just use `'switch_theme'` hook to intercept theme change. 116 | 117 | ### Invalidation by version 118 | 119 | There's another way to invalidate cached translations. 120 | 121 | _'Inpsyde Translation Cache'_ builds an unique key for the combination of text domain and `.mo` file path. 122 | 123 | This unique key is built using an 'hash' of: 124 | 125 | - text domain 126 | - `.mo` file path 127 | - _'Inpsyde Translation Cache'_ own version 128 | - an arbitrary 'version' string that can be set via `mocache_cache_version` filter 129 | 130 | It means that using `mocache_cache_version` filter it is possible to invalidate all the stored keys for a 131 | given text domain. 132 | 133 | For example, assuming same plugin as above we could do: 134 | 135 | ```php 136 | add_filter( 'mocache_cache_version', function( $version, $domain ) { 137 | $plugin_path = WP_PLUGIN_DIR . '/some-plugin-dir/some-plugin-filename.php'; 138 | $headers = get_plugin_data( $plugin_file_path, FALSE, FALSE ); 139 | 140 | return $headers['Version']; 141 | }, 10, 2 ); 142 | ``` 143 | 144 | So we use the 'Version' plugin header to invalidate the cache whenever the version change. 145 | 146 | Compared to the 'manual' approach above, this approach has the benefit to do not explicitly call _'Inpsyde Translation Cache'_ 147 | objects, so there's no need to check for class existence, in fact, if _'Inpsyde Translation Cache'_ is not installed or 148 | not activated, then the code does nothing with no effect. 149 | 150 | But it also has two flaws: 151 | 152 | - Cache entries for 'old' versions are **not** deleted, they are just ignored because there's a new version. 153 | However, they will be discarded when 'natural' expiration for keys is reached and considering that, by default, the 154 | 'natural' expiration is 12 hours, this issue should not be that critical. 155 | - A code like the one above requires the plugin to define the version in headers and to be effective it relies on the 156 | version be updated every time any translation file is changed. 157 | Even if these are common practices, theme / plugins authors may just ignore or forget them. 158 | 159 | So, again, the suggestion is to use `Text Domain` header whenever possible, maybe suggesting to maintainers of 160 | third party plugins and themes to add it when not present. 161 | 162 | -------- 163 | 164 | ## Available hooks 165 | 166 | _'Inpsyde Translation Cache'_ provides some hooks for customization. Most of them will only work properly from a MU plugin, 167 | especially if _'Inpsyde Translation Cache'_ is running as MU plugin. 168 | 169 | Available **action** hooks: 170 | 171 | - **`inpsyde_translation_cache`**, Fires just after the plugin class has been loaded. 172 | Useful to wrap calls to `Inpsyde\TranslationCache\MoCache::flush_cache()` 173 | 174 | Available **filter** hooks: 175 | 176 | - **`mocache_cache_enabled`** Can be used to disable plugin programmatically returning `false` via hooked callback. 177 | 178 | - **`mocache_cache_version`** Can be used to invalidate the cache for given text domain (passed as argument) 179 | If returned version change, cache is invalidated. See _' Invalidation by version'_ above. 180 | 181 | - **`mocache_cache_expire`** Can be used to customize the duration in seconds of cached values. Returning a value 182 | less or equal to zero prevent cache to be done at all. 183 | 184 | -------- 185 | 186 | ## Installation 187 | 188 | _'Inpsyde Translation Cache'_ is available via Composer with package name **`inpsyde/mo-cache`**, but it does not 189 | require Composer to be installed or used. 190 | 191 | The 'classical' installation method (_download_ -> _put in plugins folder_ -> _activate_) works as well. 192 | 193 | -------- 194 | 195 | ## Requirements 196 | 197 | * PHP 5.5 or higher. 198 | * WordPress, tested currently in version 5.1 199 | 200 | -------- 201 | 202 | ## License 203 | 204 | This repository is a free software, and is released under the terms of the GNU General Public License version 2 or (at your option) any later version. See [LICENSE](./LICENSE) for complete license. 205 | 206 | _'Inpsyde Translation Cache'_ incorporates work covered by the following copyright and 207 | permission notices: 208 | 209 | - ['MO Cache' WordPress plugin](https://wordpress.org/plugins/mo-cache/), 210 | Copyright (c) Masaki Takeuchi (m4i) 211 | Released under the MIT. 212 | 213 | 214 | ``` 215 | ___ _ 216 | |_ _|_ __ _ __ ___ _ _ __| | ___ 217 | | || '_ \| '_ \/ __| | | |/ _` |/ _ \ 218 | | || | | | |_) \__ \ |_| | (_| | __/ 219 | |___|_| |_| .__/|___/\__, |\__,_|\___| 220 | |_| |___/ 221 | ``` 222 | 223 | The team at [Inpsyde](https://inpsyde.com) is engineering the Web since 2006. 224 | -------------------------------------------------------------------------------- /src/MoCache.php: -------------------------------------------------------------------------------- 1 | 19 | * @author Masaki Takeuchi 20 | * @package inpsyde-translation-cache 21 | */ 22 | namespace Inpsyde\TranslationCache; 23 | 24 | /** 25 | * Class MoCache 26 | * 27 | * @package Inpsyde\TranslationCache 28 | */ 29 | class MoCache { 30 | 31 | const VERSION = '1.0.1'; 32 | const GROUP = 'mo_cache'; 33 | const KEYS_OPTION = 'inpsyde_translation_cache'; 34 | const DEFAULT_EXPIRE = 43200; // 12 hours 35 | 36 | /** 37 | * Store options for each domain. 38 | * 39 | * @var array 40 | */ 41 | private static $options; 42 | 43 | /** 44 | * Flush cache for given domain(s). 45 | * 46 | * @param string|string[] $domains The given domains. 47 | * 48 | * @return bool 49 | */ 50 | public static function flush_cache( $domains ) { 51 | 52 | $options = is_array( self::$options ) ? self::$options : get_site_option( self::KEYS_OPTION, [] ); 53 | $flushed = 0; 54 | 55 | foreach ( (array) $domains as $domain ) { 56 | if ( ! $domain || ! is_string( $domain ) || ! array_key_exists( $domain, $options ) ) { 57 | continue; 58 | } 59 | 60 | $flushed ++; 61 | 62 | $keys = $options[ $domain ]; 63 | unset( $options[ $domain ] ); 64 | 65 | array_walk( 66 | $keys, 67 | function ( $key ) { 68 | 69 | wp_cache_delete( $key, self::GROUP ); 70 | } 71 | ); 72 | } 73 | 74 | self::$options = $options; 75 | 76 | return $flushed > 0; 77 | } 78 | 79 | /** 80 | * Flush all cached translations. 81 | */ 82 | public static function flush_all() { 83 | 84 | $options = is_array( self::$options ) ? self::$options : get_site_option( self::KEYS_OPTION, [] ); 85 | self::$options = []; 86 | 87 | /** 88 | * The stored options. 89 | * 90 | * @var array $options 91 | */ 92 | foreach ( $options as $domain => $keys ) { 93 | array_walk( 94 | $keys, 95 | function ( $key ) { 96 | 97 | wp_cache_delete( $key, self::GROUP ); 98 | } 99 | ); 100 | } 101 | 102 | delete_site_option( self::KEYS_OPTION ); 103 | 104 | return TRUE; 105 | } 106 | 107 | /** 108 | * Runs when theme is switched and tries to invalidate the cache for bot old and new theme. 109 | * 110 | * @wp-hook switch_theme 111 | * 112 | * @param string $new_theme_name New theme string. 113 | * @param \WP_Theme $new_theme New Theme. 114 | * @param \WP_Theme $old_theme Old Theme. 115 | * 116 | * @return bool 117 | */ 118 | public static function on_theme_switch( $new_theme_name, \WP_Theme $new_theme, \WP_Theme $old_theme = null ) { 119 | 120 | $domains = $old_theme ? [ $old_theme->get( 'TextDomain' ) ] : []; 121 | $domains[] = $new_theme->get( 'TextDomain' ); 122 | 123 | return self::flush_cache( $domains ); 124 | } 125 | 126 | /** 127 | * Runs when a plugin is activated and deactivated, trying to invalidate the cache for it. 128 | * 129 | * @wp-hook activated_plugin 130 | * @wp-hook deactivate_plugin 131 | * 132 | * @param string $plugin_file The plugin file name string. 133 | * 134 | * @return bool 135 | */ 136 | public static function on_plugin_switch( $plugin_file ) { 137 | 138 | if ( ! is_file( $plugin_file ) ) { 139 | $plugin_file = trailingslashit( WP_PLUGIN_DIR ) . $plugin_file; 140 | } 141 | 142 | if ( ! is_file( $plugin_file ) ) { 143 | return FALSE; 144 | } 145 | 146 | $headers = get_plugin_data( $plugin_file, FALSE, FALSE ); 147 | if ( $headers && isset( $headers[ 'TextDomain' ] ) ) { 148 | return self::flush_cache( [ $headers[ 'TextDomain' ] ] ); 149 | } 150 | 151 | return FALSE; 152 | 153 | } 154 | 155 | /** 156 | * Sync options with database. 157 | * 158 | * @wp-hook shutdown 159 | */ 160 | public static function sync_options() { 161 | 162 | if ( ! is_array( self::$options ) ) { 163 | return; 164 | } 165 | 166 | $cache_found_filter = function ( $key ) { 167 | 168 | $found = FALSE; 169 | is_string( $key ) and wp_cache_get( $key, self::GROUP, TRUE, $found ); 170 | 171 | return $found; 172 | }; 173 | 174 | // Remove keys that can't be found in cache anymore. 175 | array_walk( 176 | self::$options, 177 | function ( &$keys ) use ( $cache_found_filter ) { 178 | 179 | $keys = array_filter( (array) $keys, $cache_found_filter ); 180 | } 181 | ); 182 | 183 | array_filter( self::$options ); 184 | 185 | get_site_option( self::KEYS_OPTION ) 186 | ? update_site_option( self::KEYS_OPTION, self::$options ) 187 | : add_site_option( self::KEYS_OPTION, self::$options ); 188 | } 189 | 190 | /** 191 | * Overrides default loading of .mo file, by loading translation values from cache. 192 | * 193 | * @wp-hook override_load_textdomain 194 | * 195 | * @param bool $override Whether to override the .mo file loading. Default false. 196 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 197 | * @param string $mo_file Path to the MO file. 198 | * 199 | * @return bool 200 | */ 201 | public static function load( $override, $domain, $mo_file ) { 202 | 203 | $instance = new static(); 204 | 205 | return $instance->override_load_textdomain( $override, $domain, $mo_file ); 206 | } 207 | 208 | /** 209 | * Rewrite the textdomain load with cached values. 210 | * 211 | * @param bool $override Whether to override the .mo file loading. Default false. 212 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 213 | * @param string $mo_file Path to the MO file. 214 | * 215 | * @return bool 216 | */ 217 | public function override_load_textdomain( $override, $domain, $mo_file ) { 218 | 219 | if ( ! $this->is_enabled( $domain, $mo_file ) ) { 220 | return FALSE; 221 | } 222 | 223 | /** 224 | * Fires before the MO translation file is loaded. 225 | * 226 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 227 | * @param string $mo_file Path to the .mo file. 228 | * 229 | * @see \load_textdomain() 230 | */ 231 | do_action( 'load_textdomain', $domain, $mo_file ); 232 | 233 | /** 234 | * Filters MO file path for loading translations for a specific text domain. 235 | * 236 | * @param string $mo_file Path to the MO file. 237 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 238 | * 239 | * @see \load_textdomain() 240 | */ 241 | $mo_file = (string) apply_filters( 'load_textdomain_mofile', $mo_file, $domain ); 242 | 243 | if ( function_exists( 'wp_cache_add_global_groups' ) ) { 244 | wp_cache_add_global_groups( self::GROUP ); 245 | } 246 | 247 | $key = $this->get_key( $domain, $mo_file ); 248 | 249 | $mo = new \MO(); 250 | $cached = $this->load_cache( $key, $mo ); 251 | 252 | if ( $cached ) { 253 | return $this->setup_globals( $domain, $mo ); 254 | } 255 | 256 | if ( is_readable( $mo_file ) && $mo->import_from_file( $mo_file ) ) { 257 | $this->set_cache( $key, $mo, $domain, $mo_file ); 258 | $override = $this->setup_globals( $domain, $mo ); 259 | } 260 | 261 | return $override; 262 | } 263 | 264 | /** 265 | * Returns true when cache is enabled. 266 | * 267 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 268 | * @param string $mo_file The path to the mo file. 269 | * 270 | * @return bool 271 | */ 272 | private function is_enabled( $domain, $mo_file ) { 273 | 274 | $enabled = wp_using_ext_object_cache(); 275 | 276 | /** 277 | * Filters the value of enabled. By default is true when using external object 278 | * cache, because there are no real benefit in using the plugin with default 279 | * cache mechanism that does not survive the request. 280 | * 281 | * If filters return false, plugin do nothing. 282 | * 283 | * @param bool $enabled True if plugin should work, by default when external object cache is in place. 284 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 285 | * @param string $mo_file Path to the MO file. 286 | */ 287 | $enabled = apply_filters( 'mocache_cache_enabled', $enabled, $domain, $mo_file ); 288 | 289 | return filter_var( $enabled, FILTER_VALIDATE_BOOLEAN ); 290 | 291 | } 292 | 293 | /** 294 | * Build a cache key from domain and mo file. 295 | * 296 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 297 | * @param string $mo_file The path to the mo file. 298 | * 299 | * @return string 300 | */ 301 | private function get_key( $domain, $mo_file ) { 302 | 303 | $seed = ''; 304 | $is_default = ! $domain || 'default' === $domain; 305 | if ( $is_default ) { 306 | $seed = $GLOBALS[ 'wp_version' ]; 307 | } 308 | 309 | if ( ! $seed ) { 310 | 311 | /** 312 | * Filters the cache version, can be used to invalidate the cache 313 | * when the plugin/theme that uses the mo file change version. 314 | * 315 | * @param string $seed Cache ver for given domain / mo file, when changes old cache is invalidated. 316 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 317 | */ 318 | $seed = apply_filters( 'mocache_cache_version', $seed, $domain ); 319 | } 320 | 321 | is_string( $seed ) or $seed = ''; 322 | 323 | return md5( self::VERSION . $seed . $domain . $mo_file ); 324 | } 325 | 326 | /** 327 | * Loads MO entries and headers from cache if available. 328 | * 329 | * @param string $key The key of the entry. 330 | * @param \MO $mo The translation entries. 331 | * 332 | * @return bool 333 | */ 334 | private function load_cache( $key, \MO $mo ) { 335 | 336 | $cache = wp_cache_get( $key, self::GROUP, FALSE ); 337 | if ( is_array( $cache ) && isset( $cache[ 'entries' ], $cache[ 'headers' ] ) ) { 338 | $mo->entries = $cache[ 'entries' ]; 339 | $mo->set_headers( $cache[ 'headers' ] ); 340 | 341 | return TRUE; 342 | } 343 | 344 | return FALSE; 345 | } 346 | 347 | /** 348 | * Set MO entries and headers in cache. 349 | * 350 | * @param string $key The key of the entry. 351 | * @param \MO $mo The translation entries. 352 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 353 | * @param string $mo_file The path to the mo file. 354 | * 355 | * @return void 356 | */ 357 | private function set_cache( $key, \MO $mo, $domain, $mo_file ) { 358 | 359 | $cache = [ 360 | 'entries' => $mo->entries, 361 | 'headers' => $mo->headers, 362 | ]; 363 | 364 | $expire = wp_using_ext_object_cache() ? self::DEFAULT_EXPIRE : 0; 365 | 366 | /** 367 | * Filters the expiration of cache. 368 | * 369 | * @param int $expire Time-to-live in seconds, 0 means no limit. 370 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 371 | * @param string $mo_file Path to the MO file. 372 | */ 373 | $expire = apply_filters( 'mocache_cache_expire', $expire, $domain, $mo_file ); 374 | 375 | // If filters messed up expire, just use a minimum value. 376 | is_int( $expire ) or $expire = MINUTE_IN_SECONDS; 377 | 378 | $set = $expire >= 0 ? wp_cache_set( $key, $cache, self::GROUP, $expire ) : FALSE; 379 | 380 | if ( $set && $domain && 'default' !== $domain ) { 381 | // We store options of all generated keys. 382 | $options = is_array( self::$options ) ? self::$options : get_site_option( self::KEYS_OPTION, [] ); 383 | array_key_exists( $domain, $options ) or $options[ $domain ] = []; 384 | in_array( $key, $options[ $domain ], TRUE ) or $options[ $domain ][] = $key; 385 | self::$options = $options; 386 | } 387 | } 388 | 389 | /** 390 | * Set MO in global $l10n array, merging with any existing MO value. 391 | * 392 | * @param string $domain Text domain. Unique identifier for retrieving translated strings. 393 | * @param \MO $mo The path to the mo file. 394 | * 395 | * @return bool 396 | */ 397 | private function setup_globals( $domain, \MO $mo ) { 398 | 399 | global $l10n; 400 | 401 | array_key_exists( $domain, (array) $l10n ) and $mo->merge_with( $l10n[ $domain ] ); 402 | $l10n[ $domain ] = $mo; 403 | 404 | return TRUE; 405 | } 406 | } 407 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | ### GNU GENERAL PUBLIC LICENSE 2 | 3 | Version 2, June 1991 4 | 5 | Copyright (C) 1989, 1991 Free Software Foundation, Inc. 6 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 7 | 8 | Everyone is permitted to copy and distribute verbatim copies 9 | of this license document, but changing it is not allowed. 10 | 11 | ### Preamble 12 | 13 | The licenses for most software are designed to take away your freedom 14 | to share and change it. By contrast, the GNU General Public License is 15 | intended to guarantee your freedom to share and change free 16 | software--to make sure the software is free for all its users. This 17 | General Public License applies to most of the Free Software 18 | Foundation's software and to any other program whose authors commit to 19 | using it. (Some other Free Software Foundation software is covered by 20 | the GNU Lesser General Public License instead.) You can apply it to 21 | your programs, too. 22 | 23 | When we speak of free software, we are referring to freedom, not 24 | price. Our General Public Licenses are designed to make sure that you 25 | have the freedom to distribute copies of free software (and charge for 26 | this service if you wish), that you receive source code or can get it 27 | if you want it, that you can change the software or use pieces of it 28 | in new free programs; and that you know you can do these things. 29 | 30 | To protect your rights, we need to make restrictions that forbid 31 | anyone to deny you these rights or to ask you to surrender the rights. 32 | These restrictions translate to certain responsibilities for you if 33 | you distribute copies of the software, or if you modify it. 34 | 35 | For example, if you distribute copies of such a program, whether 36 | gratis or for a fee, you must give the recipients all the rights that 37 | you have. You must make sure that they, too, receive or can get the 38 | source code. And you must show them these terms so they know their 39 | rights. 40 | 41 | We protect your rights with two steps: (1) copyright the software, and 42 | (2) offer you this license which gives you legal permission to copy, 43 | distribute and/or modify the software. 44 | 45 | Also, for each author's protection and ours, we want to make certain 46 | that everyone understands that there is no warranty for this free 47 | software. If the software is modified by someone else and passed on, 48 | we want its recipients to know that what they have is not the 49 | original, so that any problems introduced by others will not reflect 50 | on the original authors' reputations. 51 | 52 | Finally, any free program is threatened constantly by software 53 | patents. We wish to avoid the danger that redistributors of a free 54 | program will individually obtain patent licenses, in effect making the 55 | program proprietary. To prevent this, we have made it clear that any 56 | patent must be licensed for everyone's free use or not licensed at 57 | all. 58 | 59 | The precise terms and conditions for copying, distribution and 60 | modification follow. 61 | 62 | ### TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 63 | 64 | **0.** This License applies to any program or other work which 65 | contains a notice placed by the copyright holder saying it may be 66 | distributed under the terms of this General Public License. The 67 | "Program", below, refers to any such program or work, and a "work 68 | based on the Program" means either the Program or any derivative work 69 | under copyright law: that is to say, a work containing the Program or 70 | a portion of it, either verbatim or with modifications and/or 71 | translated into another language. (Hereinafter, translation is 72 | included without limitation in the term "modification".) Each licensee 73 | is addressed as "you". 74 | 75 | Activities other than copying, distribution and modification are not 76 | covered by this License; they are outside its scope. The act of 77 | running the Program is not restricted, and the output from the Program 78 | is covered only if its contents constitute a work based on the Program 79 | (independent of having been made by running the Program). Whether that 80 | is true depends on what the Program does. 81 | 82 | **1.** You may copy and distribute verbatim copies of the Program's 83 | source code as you receive it, in any medium, provided that you 84 | conspicuously and appropriately publish on each copy an appropriate 85 | copyright notice and disclaimer of warranty; keep intact all the 86 | notices that refer to this License and to the absence of any warranty; 87 | and give any other recipients of the Program a copy of this License 88 | along with the Program. 89 | 90 | You may charge a fee for the physical act of transferring a copy, and 91 | you may at your option offer warranty protection in exchange for a 92 | fee. 93 | 94 | **2.** You may modify your copy or copies of the Program or any 95 | portion of it, thus forming a work based on the Program, and copy and 96 | distribute such modifications or work under the terms of Section 1 97 | above, provided that you also meet all of these conditions: 98 | 99 | 100 | **a)** You must cause the modified files to carry prominent notices 101 | stating that you changed the files and the date of any change. 102 | 103 | 104 | **b)** You must cause any work that you distribute or publish, that in 105 | whole or in part contains or is derived from the Program or any part 106 | thereof, to be licensed as a whole at no charge to all third parties 107 | under the terms of this License. 108 | 109 | 110 | **c)** If the modified program normally reads commands interactively 111 | when run, you must cause it, when started running for such interactive 112 | use in the most ordinary way, to print or display an announcement 113 | including an appropriate copyright notice and a notice that there is 114 | no warranty (or else, saying that you provide a warranty) and that 115 | users may redistribute the program under these conditions, and telling 116 | the user how to view a copy of this License. (Exception: if the 117 | Program itself is interactive but does not normally print such an 118 | announcement, your work based on the Program is not required to print 119 | an announcement.) 120 | 121 | These requirements apply to the modified work as a whole. If 122 | identifiable sections of that work are not derived from the Program, 123 | and can be reasonably considered independent and separate works in 124 | themselves, then this License, and its terms, do not apply to those 125 | sections when you distribute them as separate works. But when you 126 | distribute the same sections as part of a whole which is a work based 127 | on the Program, the distribution of the whole must be on the terms of 128 | this License, whose permissions for other licensees extend to the 129 | entire whole, and thus to each and every part regardless of who wrote 130 | it. 131 | 132 | Thus, it is not the intent of this section to claim rights or contest 133 | your rights to work written entirely by you; rather, the intent is to 134 | exercise the right to control the distribution of derivative or 135 | collective works based on the Program. 136 | 137 | In addition, mere aggregation of another work not based on the Program 138 | with the Program (or with a work based on the Program) on a volume of 139 | a storage or distribution medium does not bring the other work under 140 | the scope of this License. 141 | 142 | **3.** You may copy and distribute the Program (or a work based on it, 143 | under Section 2) in object code or executable form under the terms of 144 | Sections 1 and 2 above provided that you also do one of the following: 145 | 146 | 147 | **a)** Accompany it with the complete corresponding machine-readable 148 | source code, which must be distributed under the terms of Sections 1 149 | and 2 above on a medium customarily used for software interchange; or, 150 | 151 | 152 | **b)** Accompany it with a written offer, valid for at least three 153 | years, to give any third party, for a charge no more than your cost of 154 | physically performing source distribution, a complete machine-readable 155 | copy of the corresponding source code, to be distributed under the 156 | terms of Sections 1 and 2 above on a medium customarily used for 157 | software interchange; or, 158 | 159 | 160 | **c)** Accompany it with the information you received as to the offer 161 | to distribute corresponding source code. (This alternative is allowed 162 | only for noncommercial distribution and only if you received the 163 | program in object code or executable form with such an offer, in 164 | accord with Subsection b above.) 165 | 166 | The source code for a work means the preferred form of the work for 167 | making modifications to it. For an executable work, complete source 168 | code means all the source code for all modules it contains, plus any 169 | associated interface definition files, plus the scripts used to 170 | control compilation and installation of the executable. However, as a 171 | special exception, the source code distributed need not include 172 | anything that is normally distributed (in either source or binary 173 | form) with the major components (compiler, kernel, and so on) of the 174 | operating system on which the executable runs, unless that component 175 | itself accompanies the executable. 176 | 177 | If distribution of executable or object code is made by offering 178 | access to copy from a designated place, then offering equivalent 179 | access to copy the source code from the same place counts as 180 | distribution of the source code, even though third parties are not 181 | compelled to copy the source along with the object code. 182 | 183 | **4.** You may not copy, modify, sublicense, or distribute the Program 184 | except as expressly provided under this License. Any attempt otherwise 185 | to copy, modify, sublicense or distribute the Program is void, and 186 | will automatically terminate your rights under this License. However, 187 | parties who have received copies, or rights, from you under this 188 | License will not have their licenses terminated so long as such 189 | parties remain in full compliance. 190 | 191 | **5.** You are not required to accept this License, since you have not 192 | signed it. However, nothing else grants you permission to modify or 193 | distribute the Program or its derivative works. These actions are 194 | prohibited by law if you do not accept this License. Therefore, by 195 | modifying or distributing the Program (or any work based on the 196 | Program), you indicate your acceptance of this License to do so, and 197 | all its terms and conditions for copying, distributing or modifying 198 | the Program or works based on it. 199 | 200 | **6.** Each time you redistribute the Program (or any work based on 201 | the Program), the recipient automatically receives a license from the 202 | original licensor to copy, distribute or modify the Program subject to 203 | these terms and conditions. You may not impose any further 204 | restrictions on the recipients' exercise of the rights granted herein. 205 | You are not responsible for enforcing compliance by third parties to 206 | this License. 207 | 208 | **7.** If, as a consequence of a court judgment or allegation of 209 | patent infringement or for any other reason (not limited to patent 210 | issues), conditions are imposed on you (whether by court order, 211 | agreement or otherwise) that contradict the conditions of this 212 | License, they do not excuse you from the conditions of this License. 213 | If you cannot distribute so as to satisfy simultaneously your 214 | obligations under this License and any other pertinent obligations, 215 | then as a consequence you may not distribute the Program at all. For 216 | example, if a patent license would not permit royalty-free 217 | redistribution of the Program by all those who receive copies directly 218 | or indirectly through you, then the only way you could satisfy both it 219 | and this License would be to refrain entirely from distribution of the 220 | Program. 221 | 222 | If any portion of this section is held invalid or unenforceable under 223 | any particular circumstance, the balance of the section is intended to 224 | apply and the section as a whole is intended to apply in other 225 | circumstances. 226 | 227 | It is not the purpose of this section to induce you to infringe any 228 | patents or other property right claims or to contest validity of any 229 | such claims; this section has the sole purpose of protecting the 230 | integrity of the free software distribution system, which is 231 | implemented by public license practices. Many people have made 232 | generous contributions to the wide range of software distributed 233 | through that system in reliance on consistent application of that 234 | system; it is up to the author/donor to decide if he or she is willing 235 | to distribute software through any other system and a licensee cannot 236 | impose that choice. 237 | 238 | This section is intended to make thoroughly clear what is believed to 239 | be a consequence of the rest of this License. 240 | 241 | **8.** If the distribution and/or use of the Program is restricted in 242 | certain countries either by patents or by copyrighted interfaces, the 243 | original copyright holder who places the Program under this License 244 | may add an explicit geographical distribution limitation excluding 245 | those countries, so that distribution is permitted only in or among 246 | countries not thus excluded. In such case, this License incorporates 247 | the limitation as if written in the body of this License. 248 | 249 | **9.** The Free Software Foundation may publish revised and/or new 250 | versions of the General Public License from time to time. Such new 251 | versions will be similar in spirit to the present version, but may 252 | differ in detail to address new problems or concerns. 253 | 254 | Each version is given a distinguishing version number. If the Program 255 | specifies a version number of this License which applies to it and 256 | "any later version", you have the option of following the terms and 257 | conditions either of that version or of any later version published by 258 | the Free Software Foundation. If the Program does not specify a 259 | version number of this License, you may choose any version ever 260 | published by the Free Software Foundation. 261 | 262 | **10.** If you wish to incorporate parts of the Program into other 263 | free programs whose distribution conditions are different, write to 264 | the author to ask for permission. For software which is copyrighted by 265 | the Free Software Foundation, write to the Free Software Foundation; 266 | we sometimes make exceptions for this. Our decision will be guided by 267 | the two goals of preserving the free status of all derivatives of our 268 | free software and of promoting the sharing and reuse of software 269 | generally. 270 | 271 | **NO WARRANTY** 272 | 273 | **11.** BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO 274 | WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. 275 | EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR 276 | OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY 277 | KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE 278 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 279 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE 280 | PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME 281 | THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 282 | 283 | **12.** IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN 284 | WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY 285 | AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU 286 | FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR 287 | CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE 288 | PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING 289 | RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A 290 | FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF 291 | SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 292 | DAMAGES. 293 | 294 | ### END OF TERMS AND CONDITIONS 295 | 296 | ### How to Apply These Terms to Your New Programs 297 | 298 | If you develop a new program, and you want it to be of the greatest 299 | possible use to the public, the best way to achieve this is to make it 300 | free software which everyone can redistribute and change under these 301 | terms. 302 | 303 | To do so, attach the following notices to the program. It is safest to 304 | attach them to the start of each source file to most effectively 305 | convey the exclusion of warranty; and each file should have at least 306 | the "copyright" line and a pointer to where the full notice is found. 307 | 308 | one line to give the program's name and an idea of what it does. 309 | Copyright (C) yyyy name of author 310 | 311 | This program is free software; you can redistribute it and/or 312 | modify it under the terms of the GNU General Public License 313 | as published by the Free Software Foundation; either version 2 314 | of the License, or (at your option) any later version. 315 | 316 | This program is distributed in the hope that it will be useful, 317 | but WITHOUT ANY WARRANTY; without even the implied warranty of 318 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 319 | GNU General Public License for more details. 320 | 321 | You should have received a copy of the GNU General Public License 322 | along with this program; if not, write to the Free Software 323 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 324 | 325 | Also add information on how to contact you by electronic and paper 326 | mail. 327 | 328 | If the program is interactive, make it output a short notice like this 329 | when it starts in an interactive mode: 330 | 331 | Gnomovision version 69, Copyright (C) year name of author 332 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details 333 | type `show w'. This is free software, and you are welcome 334 | to redistribute it under certain conditions; type `show c' 335 | for details. 336 | 337 | The hypothetical commands \`show w' and \`show c' should show the 338 | appropriate parts of the General Public License. Of course, the 339 | commands you use may be called something other than \`show w' and 340 | \`show c'; they could even be mouse-clicks or menu items--whatever 341 | suits your program. 342 | 343 | You should also get your employer (if you work as a programmer) or 344 | your school, if any, to sign a "copyright disclaimer" for the program, 345 | if necessary. Here is a sample; alter the names: 346 | 347 | Yoyodyne, Inc., hereby disclaims all copyright 348 | interest in the program `Gnomovision' 349 | (which makes passes at compilers) written 350 | by James Hacker. 351 | 352 | signature of Ty Coon, 1 April 1989 353 | Ty Coon, President of Vice 354 | 355 | This General Public License does not permit incorporating your program 356 | into proprietary programs. If your program is a subroutine library, 357 | you may consider it more useful to permit linking proprietary 358 | applications with the library. If this is what you want to do, use the 359 | [GNU Lesser General Public 360 | License](https://www.gnu.org/licenses/lgpl.html) instead of this 361 | License. 362 | --------------------------------------------------------------------------------