Complex classes like Extension 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 Extension, and based on these observations, apply Extract Interface, too.
1 | <?php |
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26 | class Extension extends SlugifyExtension |
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27 | { |
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28 | /** |
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29 | * @var Builder |
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30 | */ |
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31 | protected $builder; |
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32 | /** |
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33 | * @var Config |
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34 | */ |
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35 | protected $config; |
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36 | /** |
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37 | * @var string |
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38 | */ |
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39 | protected $outputPath; |
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40 | /** |
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41 | * @var Filesystem |
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42 | */ |
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43 | protected $fileSystem; |
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44 | |||
45 | /** |
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46 | * Constructor. |
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47 | * |
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48 | * @param Builder $builder |
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49 | */ |
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50 | public function __construct(Builder $builder) |
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61 | |||
62 | /** |
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63 | * {@inheritdoc} |
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64 | */ |
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65 | public function getName() |
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69 | |||
70 | /** |
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71 | * {@inheritdoc} |
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72 | */ |
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73 | public function getFilters() |
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89 | |||
90 | /** |
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91 | * {@inheritdoc} |
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92 | */ |
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93 | public function getFunctions() |
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104 | |||
105 | /** |
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106 | * Filter by section. |
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107 | * |
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108 | * @param PagesCollection $pages |
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109 | * @param string $section |
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110 | * |
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111 | * @return CollectionInterface |
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112 | */ |
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113 | public function filterBySection(PagesCollection $pages, string $section): CollectionInterface |
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117 | |||
118 | /** |
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119 | * Filter by variable. |
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120 | * |
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121 | * @param PagesCollection $pages |
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122 | * @param string $variable |
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123 | * @param string $value |
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124 | * |
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125 | * @return CollectionInterface |
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126 | */ |
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127 | public function filterBy(PagesCollection $pages, string $variable, string $value): CollectionInterface |
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142 | |||
143 | /** |
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144 | * Sort by title. |
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145 | * |
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146 | * @param CollectionInterface|array $collection |
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147 | * |
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148 | * @return array |
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149 | */ |
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150 | public function sortByTitle($collection): array |
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161 | |||
162 | /** |
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163 | * Sort by weight. |
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164 | * |
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165 | * @param CollectionInterface|array $collection |
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166 | * |
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167 | * @return array |
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168 | */ |
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169 | public function sortByWeight($collection): array |
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194 | |||
195 | /** |
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196 | * Sort by date. |
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197 | * |
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198 | * @param CollectionInterface|array $collection |
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199 | * |
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200 | * @return mixed |
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201 | */ |
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202 | public function sortByDate($collection): array |
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227 | |||
228 | /** |
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229 | * Create an URL. |
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230 | * |
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231 | * $options[ |
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232 | * 'canonical' => null, |
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233 | * 'addhash' => true, |
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234 | * 'format' => 'json', |
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235 | * ]; |
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236 | * |
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237 | * @param Page|string|null $value |
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238 | * @param array|null $options |
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239 | * |
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240 | * @return string|null |
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241 | */ |
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242 | public function createUrl($value = null, $options = null): ?string |
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291 | |||
292 | /** |
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293 | * Minify a CSS or a JS file. |
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294 | * |
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295 | * @param string $path |
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296 | * |
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297 | * @throws Exception |
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298 | * |
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299 | * @return string |
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300 | */ |
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301 | public function minify(string $path): string |
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323 | |||
324 | /** |
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325 | * Minify CSS. |
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326 | * |
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327 | * @param string $value |
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328 | * |
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329 | * @return string |
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330 | */ |
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331 | public function minifyCss(string $value): string |
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337 | |||
338 | /** |
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339 | * Minify JS. |
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340 | * |
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341 | * @param string $value |
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342 | * |
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343 | * @return string |
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344 | */ |
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345 | public function minifyJs(string $value): string |
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351 | |||
352 | /** |
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353 | * Compile style file to CSS. |
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354 | * |
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355 | * @param string $path |
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356 | * |
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357 | * @throws Exception |
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358 | * |
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359 | * @return string |
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360 | */ |
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361 | public function toCss(string $path): string |
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389 | |||
390 | /** |
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391 | * Compile SCSS string to CSS. |
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392 | * |
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393 | * @param string $value |
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394 | * |
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395 | * @return string |
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396 | */ |
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397 | public function scssToCss(string $value): string |
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403 | |||
404 | /** |
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405 | * Read $lenght first characters of a string and add a suffix. |
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406 | * |
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407 | * @param string $string |
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408 | * @param int $length |
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409 | * @param string $suffix |
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410 | * |
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411 | * @return string |
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412 | */ |
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413 | public function excerpt(string $string, int $length = 450, string $suffix = ' …'): string |
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424 | |||
425 | /** |
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426 | * Read characters before '<!-- excerpt -->'. |
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427 | * |
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428 | * @param string $string |
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429 | * |
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430 | * @return string |
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431 | */ |
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432 | public function excerptHtml(string $string): string |
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447 | |||
448 | /** |
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449 | * Calculate estimated time to read a text. |
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450 | * |
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451 | * @param string $text |
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452 | * |
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453 | * @return string |
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454 | */ |
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455 | public function readtime(string $text): string |
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465 | |||
466 | /** |
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467 | * Hash file with sha384. |
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468 | * |
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469 | * @param string $path |
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470 | * |
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471 | * @return string|null |
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472 | */ |
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473 | public function hashFile(string $path): ?string |
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479 | |||
480 | /** |
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481 | * Gets the value of an environment variable. |
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482 | * |
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483 | * @param string $var |
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484 | * |
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485 | * @return string|null |
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486 | */ |
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487 | public function getEnv(string $var): ?string |
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491 | } |
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492 |