Complex classes like Kirki_Output 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 Kirki_Output, and based on these observations, apply Extract Interface, too.
1 | <?php |
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15 | class Kirki_Output { |
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16 | |||
17 | /** |
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18 | * The Kirki configuration used in the field. |
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19 | * |
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20 | * @access protected |
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21 | * @var string |
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22 | */ |
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23 | protected $config_id = 'global'; |
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24 | |||
25 | /** |
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26 | * The field's `output` argument. |
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27 | * |
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28 | * @access protected |
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29 | * @var array |
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30 | */ |
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31 | protected $output = array(); |
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32 | |||
33 | /** |
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34 | * An array of the generated styles. |
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35 | * |
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36 | * @access protected |
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37 | * @var array |
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38 | */ |
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39 | protected $styles = array(); |
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40 | |||
41 | /** |
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42 | * The value. |
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43 | * |
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44 | * @access protected |
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45 | * @var string|array |
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46 | */ |
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47 | protected $value; |
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48 | |||
49 | /** |
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50 | * The class constructor. |
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51 | * |
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52 | * @access public |
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53 | * @param string $config_id The config ID. |
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54 | * @param array $output The output argument. |
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55 | * @param string|array $value The value. |
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56 | */ |
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57 | public function __construct( $config_id, $output, $value ) { |
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65 | |||
66 | /** |
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67 | * If we have a sanitize_callback defined, apply it to the value. |
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68 | * |
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69 | * @param array $output The output args. |
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70 | * @param string|array $value The value. |
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71 | * |
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72 | * @return string|array |
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73 | */ |
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74 | protected function apply_sanitize_callback( $output, $value ) { |
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88 | |||
89 | /** |
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90 | * If we have a value_pattern defined, apply it to the value. |
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91 | * |
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92 | * @param array $output The output args. |
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93 | * @param string|array $value The value. |
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94 | * |
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95 | * @return string|array |
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96 | */ |
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97 | protected function apply_value_pattern( $output, $value ) { |
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143 | |||
144 | /** |
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145 | * Parses the output arguments. |
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146 | * Calls the process_output method for each of them. |
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147 | * |
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148 | * @access protected |
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149 | */ |
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150 | protected function parse_output() { |
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200 | |||
201 | /** |
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202 | * Parses an output and creates the styles array for it. |
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203 | * |
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204 | * @access protected |
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205 | * @param array $output The field output. |
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206 | * @param string $value The value. |
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207 | * |
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208 | * @return void |
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209 | */ |
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210 | protected function process_output( $output, $value ) { |
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221 | |||
222 | /** |
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223 | * Some CSS properties are unique. |
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224 | * We need to tweak the value to make everything works as expected. |
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225 | * |
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226 | * @access protected |
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227 | * @param string $property The CSS property. |
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228 | * @param string $value The value. |
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229 | * |
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230 | * @return array |
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231 | */ |
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232 | protected function process_property_value( $property, $value ) { |
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245 | |||
246 | /** |
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247 | * Returns the value. |
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248 | * |
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249 | * @access protected |
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250 | * @param string|array $value The value. |
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251 | * @param array $output The field "output". |
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252 | * @return string|array |
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253 | */ |
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254 | protected function process_value( $value, $output ) { |
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260 | |||
261 | /** |
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262 | * Exploses the private $styles property to the world |
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263 | * |
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264 | * @access protected |
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265 | * @return array |
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266 | */ |
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267 | public function get_styles() { |
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270 | } |
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271 |
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: