Automattic /
jetpack
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Jetpack_Admin_Page often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Jetpack_Admin_Page, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 4 | abstract class Jetpack_Admin_Page { |
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| 5 | // Add page specific actions given the page hook |
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| 6 | abstract function add_page_actions( $hook ); |
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| 7 | |||
| 8 | // Create a menu item for the page and returns the hook |
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| 9 | abstract function get_page_hook(); |
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| 10 | |||
| 11 | // Enqueue and localize page specific scripts |
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| 12 | abstract function page_admin_scripts(); |
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| 13 | |||
| 14 | // Render page specific HTML |
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| 15 | abstract function page_render(); |
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| 16 | |||
| 17 | /** |
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| 18 | * Should we block the page rendering because the site is in IDC? |
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| 19 | * |
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| 20 | * @var bool |
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| 21 | */ |
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| 22 | static $block_page_rendering_for_idc; |
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| 23 | |||
| 24 | /** |
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| 25 | * Function called after admin_styles to load any additional needed styles. |
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| 26 | * |
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| 27 | * @since 4.3.0 |
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| 28 | */ |
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| 29 | function additional_styles() {} |
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| 30 | |||
| 31 | function __construct() { |
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| 32 | $this->jetpack = Jetpack::init(); |
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| 33 | self::$block_page_rendering_for_idc = ( |
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| 34 | Jetpack::validate_sync_error_idc_option() && ! Jetpack_Options::get_option( 'safe_mode_confirmed' ) |
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| 35 | ); |
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| 36 | } |
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| 37 | |||
| 38 | function add_actions() { |
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| 39 | global $pagenow; |
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| 40 | |||
| 41 | // If user is not an admin and site is in Dev Mode, don't do anything |
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| 42 | if ( ! current_user_can( 'manage_options' ) && Jetpack::is_development_mode() ) { |
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| 43 | return; |
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| 44 | } |
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| 45 | |||
| 46 | // Don't add in the modules page unless modules are available! |
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| 47 | if ( $this->dont_show_if_not_active && ! Jetpack::is_active() && ! Jetpack::is_development_mode() ) { |
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| 48 | return; |
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| 49 | } |
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| 50 | |||
| 51 | // Initialize menu item for the page in the admin |
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| 52 | $hook = $this->get_page_hook(); |
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| 53 | |||
| 54 | // Attach hooks common to all Jetpack admin pages based on the created |
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| 55 | // hook |
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| 56 | add_action( "load-$hook", array( $this, 'admin_help' ) ); |
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| 57 | add_action( "load-$hook", array( $this, 'admin_page_load' ) ); |
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| 58 | add_action( "admin_print_styles-$hook", array( $this, 'admin_styles' ) ); |
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| 59 | add_action( "admin_print_scripts-$hook", array( $this, 'admin_scripts' ) ); |
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| 60 | |||
| 61 | if ( ! self::$block_page_rendering_for_idc ) { |
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| 62 | add_action( "admin_print_styles-$hook", array( $this, 'additional_styles' ) ); |
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| 63 | } |
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| 64 | // If someone just activated Jetpack, let's show them a fullscreen connection banner. |
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| 65 | if ( |
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| 66 | ( 'admin.php' === $pagenow && isset( $_GET['page'] ) && 'jetpack' === $_GET['page'] ) |
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| 67 | && ! Jetpack::is_active() |
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| 68 | && current_user_can( 'jetpack_connect' ) |
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| 69 | && ! Jetpack::is_development_mode() |
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| 70 | ) { |
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| 71 | add_action( 'admin_enqueue_scripts', array( 'Jetpack_Connection_Banner', 'enqueue_banner_scripts' ) ); |
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| 72 | add_action( 'admin_print_styles', array( Jetpack::init(), 'admin_banner_styles' ) ); |
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| 73 | add_action( 'admin_notices', array( 'Jetpack_Connection_Banner', 'render_connect_prompt_full_screen' ) ); |
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| 74 | delete_transient( 'activated_jetpack' ); |
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| 75 | } |
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| 76 | |||
| 77 | // Check if the site plan changed and deactivate modules accordingly. |
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| 78 | add_action( 'current_screen', array( $this, 'check_plan_deactivate_modules' ) ); |
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| 79 | |||
| 80 | // Attach page specific actions in addition to the above |
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| 81 | $this->add_page_actions( $hook ); |
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| 82 | } |
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| 83 | |||
| 84 | // Render the page with a common top and bottom part, and page specific content |
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| 85 | function render() { |
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| 86 | // We're in an IDC: we need a decision made before we show the UI again. |
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| 87 | if ( self::$block_page_rendering_for_idc ) { |
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| 88 | return; |
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| 89 | } |
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| 90 | |||
| 91 | // Check if we are looking at the main dashboard |
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| 92 | if ( isset( $_GET['page'] ) && 'jetpack' === $_GET['page'] ) { |
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| 93 | $this->page_render(); |
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| 94 | return; |
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| 95 | } |
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| 96 | self::wrap_ui( array( $this, 'page_render' ) ); |
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| 97 | } |
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| 98 | |||
| 99 | function admin_help() { |
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| 100 | $this->jetpack->admin_help(); |
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| 101 | } |
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| 102 | |||
| 103 | function admin_page_load() { |
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| 104 | // This is big. For the moment, just call the existing one. |
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| 105 | $this->jetpack->admin_page_load(); |
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| 106 | } |
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| 107 | |||
| 108 | // Add page specific scripts and jetpack stats for all menu pages |
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| 109 | function admin_scripts() { |
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| 110 | $this->page_admin_scripts(); // Delegate to inheriting class |
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| 111 | add_action( 'admin_footer', array( $this->jetpack, 'do_stats' ) ); |
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| 112 | } |
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| 113 | |||
| 114 | // Enqueue the Jetpack admin stylesheet |
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| 115 | function admin_styles() { |
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| 116 | $min = ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) ? '' : '.min'; |
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| 117 | |||
| 118 | wp_enqueue_style( 'jetpack-admin', plugins_url( "css/jetpack-admin{$min}.css", JETPACK__PLUGIN_FILE ), array( 'genericons' ), JETPACK__VERSION . '-20121016' ); |
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| 119 | wp_style_add_data( 'jetpack-admin', 'rtl', 'replace' ); |
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| 120 | wp_style_add_data( 'jetpack-admin', 'suffix', $min ); |
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| 121 | } |
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| 122 | |||
| 123 | /** |
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| 124 | * Checks if REST API is enabled. |
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| 125 | * |
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| 126 | * @since 4.4.2 |
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| 127 | * |
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| 128 | * @return bool |
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| 129 | */ |
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| 130 | function is_rest_api_enabled() { |
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| 131 | return /** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */ |
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| 132 | apply_filters( 'rest_enabled', true ) && |
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| 133 | /** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */ |
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| 134 | apply_filters( 'rest_jsonp_enabled', true ) && |
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| 135 | /** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */ |
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| 136 | apply_filters( 'rest_authentication_errors', true ); |
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| 137 | } |
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| 138 | |||
| 139 | /** |
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| 140 | * Checks the site plan and deactivates modules that were active but are no longer included in the plan. |
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| 141 | * |
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| 142 | * @since 4.4.0 |
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| 143 | * |
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| 144 | * @param $page |
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| 145 | * |
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| 146 | * @return array |
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| 147 | */ |
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| 148 | function check_plan_deactivate_modules( $page ) { |
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| 202 | |||
| 203 | static function load_wrapper_styles() { |
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| 204 | $rtl = is_rtl() ? '.rtl' : ''; |
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| 205 | wp_enqueue_style( 'dops-css', plugins_url( "_inc/build/admin.dops-style{$rtl}.css", JETPACK__PLUGIN_FILE ), array(), JETPACK__VERSION ); |
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| 206 | wp_enqueue_style( 'components-css', plugins_url( "_inc/build/style.min{$rtl}.css", JETPACK__PLUGIN_FILE ), array(), JETPACK__VERSION ); |
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| 207 | $custom_css = ' |
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| 208 | #wpcontent { |
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| 209 | padding-left: 0 !important; |
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| 210 | } |
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| 211 | #wpbody-content { |
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| 243 | |||
| 244 | public static function wrap_ui( $callback, $args = array() ) { |
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| 353 | } |
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| 354 |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: