WebDevStudios /
CMB2
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 CMB2_Base 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 CMB2_Base, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 18 | abstract class CMB2_Base { |
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| 19 | |||
| 20 | /** |
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| 21 | * Current CMB2 instance ID |
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| 22 | * @var string |
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| 23 | * @since 2.2.3 |
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| 24 | */ |
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| 25 | protected $cmb_id = ''; |
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| 26 | |||
| 27 | /** |
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| 28 | * The object properties name. |
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| 29 | * @var string |
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| 30 | * @since 2.2.3 |
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| 31 | */ |
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| 32 | protected $properties_name = 'meta_box'; |
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| 33 | |||
| 34 | /** |
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| 35 | * Object ID |
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| 36 | * @var mixed |
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| 37 | * @since 2.2.3 |
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| 38 | */ |
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| 39 | protected $object_id = 0; |
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| 40 | |||
| 41 | /** |
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| 42 | * Type of object being handled. (e.g., post, user, comment, or term) |
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| 43 | * @var string |
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| 44 | * @since 2.2.3 |
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| 45 | */ |
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| 46 | protected $object_type = ''; |
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| 47 | |||
| 48 | /** |
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| 49 | * Array of key => value data for saving. Likely $_POST data. |
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| 50 | * @var array |
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| 51 | * @since 2.2.3 |
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| 52 | */ |
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| 53 | public $data_to_save = array(); |
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| 54 | |||
| 55 | /** |
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| 56 | * Array of field param callback results |
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| 57 | * @var array |
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| 58 | * @since 2.0.0 |
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| 59 | */ |
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| 60 | protected $callback_results = array(); |
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| 61 | |||
| 62 | /** |
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| 63 | * The deprecated_param method deprecated param message signature. |
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| 64 | */ |
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| 65 | const DEPRECATED_PARAM = 1; |
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| 66 | |||
| 67 | /** |
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| 68 | * The deprecated_param method deprecated callback param message signature. |
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| 69 | */ |
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| 70 | const DEPRECATED_CB_PARAM = 2; |
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| 71 | |||
| 72 | /** |
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| 73 | * Get started |
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| 74 | * @since 2.2.3 |
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| 75 | * @param array $args Object properties array |
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| 76 | */ |
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| 77 | public function __construct( $args = array() ) { |
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| 92 | |||
| 93 | /** |
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| 94 | * Returns the object ID |
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| 95 | * @since 2.2.3 |
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| 96 | * @param integer $object_id Object ID |
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| 97 | * @return integer Object ID |
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| 98 | */ |
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| 99 | 5 | public function object_id( $object_id = 0 ) { |
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| 106 | |||
| 107 | /** |
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| 108 | * Returns the object type |
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| 109 | * @since 2.2.3 |
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| 110 | * @param string $object_type Object Type |
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| 111 | * @return string Object type |
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| 112 | */ |
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| 113 | 5 | public function object_type( $object_type = '' ) { |
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| 120 | |||
| 121 | /** |
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| 122 | * Get the object type for the current page, based on the $pagenow global. |
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| 123 | * @since 2.2.2 |
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| 124 | * @return string Page object type name. |
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| 125 | */ |
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| 126 | View Code Duplication | public function current_object_type() { |
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| 144 | |||
| 145 | /** |
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| 146 | * Set object property. |
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| 147 | * @since 2.2.2 |
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| 148 | * @param string $property Metabox config property to retrieve |
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| 149 | * @param mixed $value Value to set if no value found |
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| 150 | * @return mixed Metabox config property value or false |
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| 151 | */ |
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| 152 | public function set_prop( $property, $value ) { |
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| 157 | |||
| 158 | /** |
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| 159 | * Get object property and optionally set a fallback |
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| 160 | * @since 2.0.0 |
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| 161 | * @param string $property Metabox config property to retrieve |
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| 162 | * @param mixed $fallback Fallback value to set if no value found |
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| 163 | * @return mixed Metabox config property value or false |
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| 164 | */ |
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| 165 | 43 | public function prop( $property, $fallback = null ) { |
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| 172 | |||
| 173 | /** |
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| 174 | * Get default field arguments specific to this CMB2 object. |
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| 175 | * @since 2.2.0 |
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| 176 | * @param array $field_args Metabox field config array. |
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| 177 | * @param CMB2_Field $field_group (optional) CMB2_Field object (group parent) |
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| 178 | * @return array Array of field arguments. |
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| 179 | */ |
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| 180 | 6 | View Code Duplication | protected function get_default_args( $field_args, $field_group = null ) { |
| 181 | 6 | if ( $field_group ) { |
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| 182 | $args = array( |
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| 183 | 1 | 'field_args' => $field_args, |
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| 184 | 1 | 'group_field' => $field_group, |
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| 185 | 1 | ); |
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| 186 | 1 | } else { |
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| 187 | $args = array( |
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| 188 | 5 | 'field_args' => $field_args, |
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| 189 | 5 | 'object_type' => $this->object_type(), |
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| 190 | 5 | 'object_id' => $this->object_id(), |
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| 191 | 5 | 'cmb_id' => $this->cmb_id, |
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| 192 | 5 | ); |
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| 193 | } |
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| 194 | |||
| 195 | 6 | return $args; |
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| 196 | } |
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| 197 | |||
| 198 | /** |
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| 199 | * Get a new field object specific to this CMB2 object. |
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| 200 | * @since 2.2.0 |
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| 201 | * @param array $field_args Metabox field config array. |
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| 202 | * @param CMB2_Field $field_group (optional) CMB2_Field object (group parent) |
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| 203 | * @return CMB2_Field CMB2_Field object |
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| 204 | */ |
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| 205 | 6 | protected function get_new_field( $field_args, $field_group = null ) { |
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| 208 | |||
| 209 | /** |
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| 210 | * Determine whether this cmb object should show, based on the 'show_on_cb' callback. |
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| 211 | * |
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| 212 | * @since 2.0.9 |
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| 213 | * |
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| 214 | * @return bool Whether this cmb should be shown. |
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| 215 | */ |
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| 216 | 43 | public function should_show() { |
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| 227 | |||
| 228 | /** |
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| 229 | * Displays the results of the param callbacks. |
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| 230 | * |
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| 231 | * @since 2.0.0 |
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| 232 | * @param string $param Field parameter |
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| 233 | */ |
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| 234 | 80 | public function peform_param_callback( $param ) { |
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| 237 | |||
| 238 | /** |
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| 239 | * Store results of the param callbacks for continual access |
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| 240 | * @since 2.0.0 |
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| 241 | * @param string $param Field parameter |
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| 242 | * @return mixed Results of param/param callback |
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| 243 | */ |
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| 244 | 85 | public function get_param_callback_result( $param ) { |
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| 275 | |||
| 276 | /** |
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| 277 | * Handles the parameter callbacks, and passes this object as parameter. |
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| 278 | * @since 2.2.3 |
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| 279 | * @param callable $cb The callback method/function/closure |
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| 280 | * @return mixed Return of the callback function. |
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| 281 | */ |
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| 282 | 49 | protected function do_callback( $cb ) { |
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| 285 | |||
| 286 | /** |
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| 287 | * Checks if field has a callback value |
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| 288 | * @since 1.0.1 |
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| 289 | * @param string $cb Callback string |
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| 290 | * @return mixed NULL, false for NO validation, or $cb string if it exists. |
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| 291 | */ |
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| 292 | 99 | public function maybe_callback( $cb ) { |
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| 312 | |||
| 313 | /** |
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| 314 | * Checks if this object has parameter corresponding to the given filter |
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| 315 | * which is callable. If so, it registers the callback, and if not, |
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| 316 | * converts the maybe-modified $val to a boolean for return. |
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| 317 | * |
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| 318 | * The registered handlers will have a parameter name which matches the filter, except: |
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| 319 | * - The 'cmb2_api' prefix will be removed |
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| 320 | * - A '_cb' suffix will be added (to stay inline with other '*_cb' parameters). |
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| 321 | * |
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| 322 | * @since 2.2.3 |
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| 323 | * |
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| 324 | * @param string $hook_name The hook name. |
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| 325 | * @param bool $val The default value. |
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| 326 | * @param string $hook_function The hook function. Default: 'add_filter' |
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| 327 | * |
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| 328 | * @return null|bool Null if hook is registered, or bool for value. |
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| 329 | */ |
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| 330 | public function maybe_hook_parameter( $hook_name, $val = null, $hook_function = 'add_filter' ) { |
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| 341 | |||
| 342 | /** |
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| 343 | * Checks if given value is callable, and registers the callback. |
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| 344 | * If is non-callable, converts the $val to a boolean for return. |
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| 345 | * |
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| 346 | * @since 2.2.3 |
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| 347 | * |
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| 348 | * @param bool $val The default value. |
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| 349 | * @param string $hook_name The hook name. |
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| 350 | * @param string $hook_function The hook function. |
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| 351 | * |
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| 352 | * @return null|bool Null if hook is registered, or bool for value. |
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| 353 | */ |
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| 354 | public static function maybe_hook( $val, $hook_name, $hook_function ) { |
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| 363 | |||
| 364 | /** |
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| 365 | * Mark a param as deprecated and inform when it has been used. |
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| 366 | * |
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| 367 | * There is a default WordPress hook deprecated_argument_run that will be called |
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| 368 | * that can be used to get the backtrace up to what file and function used the |
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| 369 | * deprecated argument. |
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| 370 | * |
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| 371 | * The current behavior is to trigger a user error if WP_DEBUG is true. |
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| 372 | * |
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| 373 | * @since 2.2.3 |
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| 374 | * |
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| 375 | * @param string $function The function that was called. |
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| 376 | * @param string $version The version of CMB2 that deprecated the argument used. |
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| 377 | * @param string $message Optional. A message regarding the change, or numeric |
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| 378 | * key to generate message from additional arguments. |
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| 379 | * Default null. |
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| 380 | */ |
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| 381 | 1 | protected function deprecated_param( $function, $version, $message = null ) { |
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| 438 | |||
| 439 | /** |
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| 440 | * Magic getter for our object. |
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| 441 | * @param string $field |
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| 442 | * @throws Exception Throws an exception if the field is invalid. |
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| 443 | * @return mixed |
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| 444 | */ |
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| 445 | 69 | public function __get( $field ) { |
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| 462 | |||
| 463 | /** |
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| 464 | * Allows overloading the object with methods... Whooaaa oooh it's magic, y'knoooow. |
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| 465 | * @since 1.0.0 |
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| 466 | * @param string $method Non-existent method. |
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| 467 | * @param array $args All arguments passed to the method |
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| 468 | */ |
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| 469 | 2 | public function __call( $method, $args ) { |
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| 497 | } |
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| 498 |
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.