Complex classes like Formatter 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 Formatter, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 19 | class Formatter |
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| 20 | { |
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| 21 | /** |
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| 22 | * @var bool |
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| 23 | */ |
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| 24 | private $debug; |
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| 25 | |||
| 26 | /** |
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| 27 | * @var int |
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| 28 | */ |
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| 29 | private $indentationStep; |
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| 30 | |||
| 31 | /** |
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| 32 | * @param bool $debug |
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| 33 | * @param int $indentationStep |
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| 34 | */ |
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| 35 | 1808 | public function __construct($debug = false, $indentationStep = 4) |
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| 40 | |||
| 41 | /** |
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| 42 | * @return bool |
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| 43 | */ |
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| 44 | 464 | public function isDebug() |
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| 48 | |||
| 49 | /** |
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| 50 | * @param bool $debug |
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| 51 | */ |
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| 52 | 1808 | public function setDebug($debug) |
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| 56 | |||
| 57 | /** |
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| 58 | * @return int |
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| 59 | */ |
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| 60 | 8 | public function getIndentationStep() |
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| 64 | |||
| 65 | /** |
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| 66 | * @param int $indentationStep |
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| 67 | */ |
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| 68 | 1808 | public function setIndentationStep($indentationStep) |
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| 72 | |||
| 73 | /** |
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| 74 | * @param string|null $name |
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| 75 | * @param string|false|null $namespace |
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| 76 | * |
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| 77 | * @return string |
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| 78 | */ |
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| 79 | 580 | public function renderClass($name = null, $namespace = null) |
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| 91 | |||
| 92 | /** |
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| 93 | * @param string $class |
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| 94 | * @param string $value |
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| 95 | * @param string|false|null $namespace |
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| 96 | * |
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| 97 | * @return string |
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| 98 | */ |
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| 99 | 320 | public function renderConstant($class, $value, $namespace = null) |
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| 103 | |||
| 104 | /** |
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| 105 | * @param string $class |
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| 106 | * @param string[] $arguments |
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| 107 | * @param string|false|null $namespace |
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| 108 | * @param bool $semicolon |
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| 109 | * @param bool $newLine |
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| 110 | * |
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| 111 | * @return string |
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| 112 | */ |
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| 113 | 436 | public function renderObject( |
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| 127 | |||
| 128 | /** |
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| 129 | * @param string $object |
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| 130 | * @param string|null $property |
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| 131 | * |
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| 132 | * @return string |
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| 133 | */ |
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| 134 | 740 | public function renderProperty($object, $property = null) |
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| 142 | |||
| 143 | /** |
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| 144 | * @param VariableAwareInterface $object |
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| 145 | * @param string $method |
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| 146 | * @param string[] $arguments |
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| 147 | * @param bool $semicolon |
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| 148 | * @param bool $newLine |
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| 149 | * |
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| 150 | * @return string |
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| 151 | */ |
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| 152 | 308 | public function renderObjectCall( |
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| 166 | |||
| 167 | /** |
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| 168 | * @param string|null $method |
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| 169 | * @param string[] $arguments |
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| 170 | * @param bool $semicolon |
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| 171 | * @param bool $newLine |
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| 172 | * |
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| 173 | * @return string |
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| 174 | */ |
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| 175 | 668 | public function renderCall($method, array $arguments = [], $semicolon = false, $newLine = false) |
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| 183 | |||
| 184 | /** |
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| 185 | * @param string|null $code |
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| 186 | * @param string[] $arguments |
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| 187 | * @param string|null $name |
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| 188 | * @param bool $semicolon |
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| 189 | * @param bool $newLine |
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| 190 | * |
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| 191 | * @return string |
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| 192 | */ |
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| 193 | 400 | public function renderClosure( |
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| 212 | |||
| 213 | /** |
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| 214 | * @param VariableAwareInterface $object |
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| 215 | * @param string $declaration |
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| 216 | * @param bool $semicolon |
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| 217 | * @param bool $newLine |
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| 218 | * |
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| 219 | * @return string |
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| 220 | */ |
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| 221 | 468 | public function renderObjectAssignment( |
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| 229 | |||
| 230 | /** |
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| 231 | * @param VariableAwareInterface $root |
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| 232 | * @param string $declaration |
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| 233 | * @param string|null $propertyPath |
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| 234 | * @param VariableAwareInterface|null $object |
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| 235 | * @param bool $semicolon |
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| 236 | * @param bool $newLine |
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| 237 | * |
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| 238 | * @return string |
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| 239 | */ |
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| 240 | 312 | public function renderContainerAssignment( |
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| 255 | |||
| 256 | /** |
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| 257 | * @param VariableAwareInterface $root |
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| 258 | * @param string|null $propertyPath |
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| 259 | * @param VariableAwareInterface|null $object |
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| 260 | * |
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| 261 | * @return string |
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| 262 | */ |
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| 263 | 328 | public function renderContainerVariable( |
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| 280 | |||
| 281 | /** |
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| 282 | * @param string $variable |
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| 283 | * @param string $declaration |
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| 284 | * @param bool $semicolon |
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| 285 | * @param bool $newLine |
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| 286 | * |
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| 287 | * @return string |
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| 288 | */ |
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| 289 | 592 | public function renderAssignment($variable, $declaration, $semicolon = false, $newLine = false) |
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| 295 | |||
| 296 | /** |
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| 297 | * @param string $statement |
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| 298 | * @param string $code |
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| 299 | * @param string|null $condition |
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| 300 | * @param string|null $next |
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| 301 | * @param bool $newLine |
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| 302 | * |
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| 303 | * @return string |
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| 304 | */ |
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| 305 | 320 | public function renderStatement($statement, $code, $condition = null, $next = null, $newLine = true) |
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| 324 | |||
| 325 | /** |
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| 326 | * @param string $code |
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| 327 | * @param bool $semicolon |
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| 328 | * @param bool $newLine |
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| 329 | * |
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| 330 | * @return string |
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| 331 | */ |
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| 332 | 928 | public function renderCode($code, $semicolon = true, $newLine = true) |
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| 340 | |||
| 341 | /** |
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| 342 | * @param string|null $code |
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| 343 | * |
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| 344 | * @return string |
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| 345 | */ |
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| 346 | 584 | public function renderIndentation($code = null) |
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| 355 | |||
| 356 | /** |
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| 357 | * @param string[] $codes |
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| 358 | * @param bool $newLine |
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| 359 | * @param bool $eolLine |
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| 360 | * |
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| 361 | * @return string |
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| 362 | */ |
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| 363 | 608 | public function renderLines(array $codes, $newLine = true, $eolLine = true) |
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| 374 | |||
| 375 | 600 | /** |
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| 376 | 416 | * @param string|null $code |
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| 377 | 536 | * @param bool $newLine |
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| 378 | 416 | * |
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| 379 | 208 | * @return string |
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| 380 | */ |
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| 381 | 600 | public function renderLine($code = null, $newLine = true) |
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| 389 | |||
| 390 | 1120 | /** |
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| 391 | * @param string $argument |
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| 392 | 1120 | * |
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| 393 | 184 | * @return string |
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| 394 | 92 | */ |
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| 395 | public function renderEscape($argument) |
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| 399 | |||
| 400 | /** |
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| 401 | * @return string |
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| 402 | */ |
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| 403 | public function renderSeparator() |
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| 407 | |||
| 408 | /** |
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| 409 | * @param string[] $arguments |
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| 410 | * |
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| 411 | * @return string |
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| 412 | 976 | */ |
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| 413 | private function renderArguments(array $arguments) |
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| 417 | } |
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| 418 |