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 SimpleHtmlDom 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 SimpleHtmlDom, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 14 | class SimpleHtmlDom extends AbstractSimpleHtmlDom implements \IteratorAggregate, SimpleHtmlDomInterface |
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| 15 | { |
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| 16 | /** |
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| 17 | * @param \DOMElement|\DOMNode $node |
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| 18 | */ |
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| 19 | 139 | public function __construct(\DOMNode $node) |
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| 23 | |||
| 24 | /** |
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| 25 | * @param string $name |
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| 26 | * @param array $arguments |
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| 27 | * |
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| 28 | * @throws \BadMethodCallException |
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| 29 | * |
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| 30 | * @return SimpleHtmlDomInterface|string|null |
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| 31 | */ |
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| 32 | 10 | public function __call($name, $arguments) |
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| 42 | |||
| 43 | /** |
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| 44 | * Find list of nodes with a CSS selector. |
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| 45 | * |
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| 46 | * @param string $selector |
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| 47 | * @param int|null $idx |
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| 48 | * |
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| 49 | * @return SimpleHtmlDomInterface|SimpleHtmlDomInterface[]|SimpleHtmlDomNodeInterface<SimpleHtmlDomInterface> |
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| 50 | */ |
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| 51 | 26 | public function find(string $selector, $idx = null) |
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| 55 | |||
| 56 | /** |
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| 57 | * Returns an array of attributes. |
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| 58 | * |
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| 59 | * @return array|null |
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| 60 | */ |
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| 61 | 3 | View Code Duplication | public function getAllAttributes() |
| 74 | |||
| 75 | /** |
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| 76 | * @return bool |
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| 77 | */ |
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| 78 | public function hasAttributes(): bool |
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| 82 | |||
| 83 | /** |
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| 84 | * Return attribute value. |
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| 85 | * |
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| 86 | * @param string $name |
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| 87 | * |
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| 88 | * @return string |
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| 89 | */ |
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| 90 | 24 | public function getAttribute(string $name): string |
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| 100 | |||
| 101 | /** |
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| 102 | * Determine if an attribute exists on the element. |
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| 103 | * |
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| 104 | * @param string $name |
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| 105 | * |
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| 106 | * @return bool |
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| 107 | */ |
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| 108 | 2 | public function hasAttribute(string $name): bool |
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| 116 | |||
| 117 | /** |
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| 118 | * Get dom node's outer html. |
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| 119 | * |
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| 120 | * @param bool $multiDecodeNewHtmlEntity |
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| 121 | * |
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| 122 | * @return string |
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| 123 | */ |
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| 124 | 32 | public function html(bool $multiDecodeNewHtmlEntity = false): string |
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| 128 | |||
| 129 | /** |
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| 130 | * Get dom node's inner html. |
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| 131 | * |
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| 132 | * @param bool $multiDecodeNewHtmlEntity |
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| 133 | * |
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| 134 | * @return string |
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| 135 | */ |
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| 136 | 21 | public function innerHtml(bool $multiDecodeNewHtmlEntity = false): string |
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| 140 | |||
| 141 | /** |
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| 142 | * Remove attribute. |
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| 143 | * |
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| 144 | * @param string $name <p>The name of the html-attribute.</p> |
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| 145 | * |
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| 146 | * @return SimpleHtmlDomInterface |
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| 147 | */ |
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| 148 | 2 | public function removeAttribute(string $name): SimpleHtmlDomInterface |
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| 156 | |||
| 157 | /** |
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| 158 | * Replace child node. |
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| 159 | * |
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| 160 | * @param string $string |
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| 161 | * |
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| 162 | * @return SimpleHtmlDomInterface |
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| 163 | */ |
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| 164 | 8 | View Code Duplication | protected function replaceChildWithString(string $string): SimpleHtmlDomInterface |
| 209 | |||
| 210 | /** |
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| 211 | * Replace this node. |
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| 212 | * |
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| 213 | * @param string $string |
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| 214 | * |
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| 215 | * @return SimpleHtmlDomInterface |
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| 216 | */ |
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| 217 | 6 | protected function replaceNodeWithString(string $string): SimpleHtmlDomInterface |
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| 279 | |||
| 280 | /** |
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| 281 | * Replace this node with text |
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| 282 | * |
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| 283 | * @param string $string |
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| 284 | * |
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| 285 | * @return SimpleHtmlDomInterface |
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| 286 | */ |
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| 287 | 1 | View Code Duplication | protected function replaceTextWithString($string): SimpleHtmlDomInterface |
| 305 | |||
| 306 | /** |
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| 307 | * Set attribute value. |
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| 308 | * |
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| 309 | * @param string $name <p>The name of the html-attribute.</p> |
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| 310 | * @param string|null $value <p>Set to NULL or empty string, to remove the attribute.</p> |
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| 311 | * @param bool $strict </p> |
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| 312 | * $value must be NULL, to remove the attribute, |
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| 313 | * so that you can set an empty string as attribute-value e.g. autofocus="" |
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| 314 | * </p> |
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| 315 | * |
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| 316 | * @return SimpleHtmlDomInterface |
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| 317 | */ |
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| 318 | 14 | View Code Duplication | public function setAttribute(string $name, $value = null, bool $strict = false): SimpleHtmlDomInterface |
| 334 | |||
| 335 | /** |
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| 336 | * Get dom node's plain text. |
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| 337 | * |
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| 338 | * @return string |
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| 339 | */ |
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| 340 | 18 | public function text(): string |
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| 344 | |||
| 345 | /** |
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| 346 | * Change the name of a tag in a "DOMNode". |
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| 347 | * |
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| 348 | * @param \DOMNode $node |
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| 349 | * @param string $name |
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| 350 | * |
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| 351 | * @return \DOMElement|false |
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| 352 | * <p>DOMElement a new instance of class DOMElement or false |
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| 353 | * if an error occured.</p> |
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| 354 | */ |
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| 355 | 9 | View Code Duplication | protected function changeElementName(\DOMNode $node, string $name) |
| 380 | |||
| 381 | /** |
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| 382 | * Returns children of node. |
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| 383 | * |
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| 384 | * @param int $idx |
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| 385 | * |
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| 386 | * @return SimpleHtmlDomInterface|SimpleHtmlDomInterface[]|SimpleHtmlDomNodeInterface|null |
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| 387 | */ |
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| 388 | 2 | View Code Duplication | public function childNodes(int $idx = -1) |
| 398 | |||
| 399 | /** |
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| 400 | * Find nodes with a CSS selector. |
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| 401 | * |
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| 402 | * @param string $selector |
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| 403 | * |
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| 404 | * @return SimpleHtmlDomInterface[]|SimpleHtmlDomNodeInterface<SimpleHtmlDomInterface> |
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| 405 | */ |
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| 406 | 1 | public function findMulti(string $selector): SimpleHtmlDomNodeInterface |
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| 410 | |||
| 411 | /** |
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| 412 | * Find nodes with a CSS selector or false, if no element is found. |
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| 413 | * |
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| 414 | * @param string $selector |
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| 415 | * |
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| 416 | * @return false|SimpleHtmlDomInterface[]|SimpleHtmlDomNodeInterface<SimpleHtmlDomInterface> |
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| 417 | */ |
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| 418 | 1 | public function findMultiOrFalse(string $selector) |
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| 422 | |||
| 423 | /** |
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| 424 | * Find one node with a CSS selector. |
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| 425 | * |
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| 426 | * @param string $selector |
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| 427 | * |
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| 428 | * @return SimpleHtmlDomInterface |
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| 429 | */ |
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| 430 | 2 | public function findOne(string $selector): SimpleHtmlDomInterface |
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| 434 | |||
| 435 | /** |
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| 436 | * Find one node with a CSS selector or false, if no element is found. |
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| 437 | * |
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| 438 | * @param string $selector |
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| 439 | * |
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| 440 | * @return false|SimpleHtmlDomInterface |
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| 441 | */ |
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| 442 | 1 | public function findOneOrFalse(string $selector) |
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| 446 | |||
| 447 | /** |
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| 448 | * Returns the first child of node. |
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| 449 | * |
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| 450 | * @return SimpleHtmlDomInterface|null |
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| 451 | */ |
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| 452 | 4 | View Code Duplication | public function firstChild() |
| 463 | |||
| 464 | /** |
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| 465 | * Return elements by ".class". |
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| 466 | * |
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| 467 | * @param string $class |
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| 468 | * |
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| 469 | * @return SimpleHtmlDomInterface[]|SimpleHtmlDomNodeInterface<SimpleHtmlDomInterface> |
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| 470 | */ |
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| 471 | public function getElementByClass(string $class): SimpleHtmlDomNodeInterface |
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| 475 | |||
| 476 | /** |
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| 477 | * Return element by #id. |
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| 478 | * |
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| 479 | * @param string $id |
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| 480 | * |
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| 481 | * @return SimpleHtmlDomInterface |
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| 482 | */ |
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| 483 | public function getElementById(string $id): SimpleHtmlDomInterface |
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| 487 | |||
| 488 | /** |
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| 489 | * Return element by tag name. |
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| 490 | * |
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| 491 | * @param string $name |
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| 492 | * |
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| 493 | * @return SimpleHtmlDomInterface |
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| 494 | */ |
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| 495 | View Code Duplication | public function getElementByTagName(string $name): SimpleHtmlDomInterface |
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| 509 | |||
| 510 | /** |
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| 511 | * Returns elements by "#id". |
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| 512 | * |
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| 513 | * @param string $id |
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| 514 | * @param int|null $idx |
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| 515 | * |
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| 516 | * @return SimpleHtmlDomInterface|SimpleHtmlDomInterface[]|SimpleHtmlDomNodeInterface<SimpleHtmlDomInterface> |
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| 517 | */ |
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| 518 | public function getElementsById(string $id, $idx = null) |
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| 522 | |||
| 523 | /** |
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| 524 | * Returns elements by tag name. |
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| 525 | * |
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| 526 | * @param string $name |
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| 527 | * @param int|null $idx |
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| 528 | * |
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| 529 | * @return SimpleHtmlDomInterface|SimpleHtmlDomInterface[]|SimpleHtmlDomNodeInterface<SimpleHtmlDomInterface> |
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| 530 | */ |
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| 531 | View Code Duplication | public function getElementsByTagName(string $name, $idx = null) |
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| 562 | |||
| 563 | /** |
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| 564 | * Create a new "HtmlDomParser"-object from the current context. |
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| 565 | * |
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| 566 | * @return HtmlDomParser |
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| 567 | */ |
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| 568 | public function getHtmlDomParser(): HtmlDomParser |
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| 572 | |||
| 573 | /** |
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| 574 | * @return \DOMNode |
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| 575 | */ |
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| 576 | public function getNode(): \DOMNode |
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| 580 | |||
| 581 | /** |
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| 582 | * Nodes can get partially destroyed in which they're still an |
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| 583 | * actual DOM node (such as \DOMElement) but almost their entire |
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| 584 | * body is gone, including the `nodeType` attribute. |
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| 585 | * |
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| 586 | * @return bool true if node has been destroyed |
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| 587 | */ |
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| 588 | public function isRemoved(): bool |
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| 592 | |||
| 593 | /** |
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| 594 | * Returns the last child of node. |
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| 595 | * |
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| 596 | * @return SimpleHtmlDomInterface|null |
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| 597 | */ |
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| 598 | View Code Duplication | public function lastChild() |
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| 609 | |||
| 610 | /** |
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| 611 | * Returns the next sibling of node. |
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| 612 | * |
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| 613 | * @return SimpleHtmlDomInterface|null |
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| 614 | */ |
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| 615 | View Code Duplication | public function nextSibling() |
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| 626 | |||
| 627 | /** |
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| 628 | * Returns the next sibling of node. |
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| 629 | * |
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| 630 | * @return SimpleHtmlDomInterface|null |
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| 631 | */ |
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| 632 | View Code Duplication | public function nextNonWhitespaceSibling() |
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| 648 | |||
| 649 | /** |
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| 650 | * Returns the parent of node. |
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| 651 | * |
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| 652 | * @return SimpleHtmlDomInterface |
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| 653 | */ |
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| 654 | public function parentNode(): SimpleHtmlDomInterface |
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| 658 | |||
| 659 | /** |
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| 660 | * Returns the previous sibling of node. |
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| 661 | * |
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| 662 | * @return SimpleHtmlDomInterface|null |
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| 663 | */ |
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| 664 | View Code Duplication | public function previousSibling() |
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| 675 | |||
| 676 | /** |
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| 677 | * @param string|string[]|null $value <p> |
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| 678 | * null === get the current input value |
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| 679 | * text === set a new input value |
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| 680 | * </p> |
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| 681 | * |
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| 682 | * @return string|string[]|null |
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| 683 | */ |
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| 684 | View Code Duplication | public function val($value = null) |
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| 760 | |||
| 761 | /** |
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| 762 | * @param HtmlDomParser $newDocument |
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| 763 | * @param bool $removeExtraHeadTag |
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| 764 | * |
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| 765 | * @return HtmlDomParser |
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| 766 | */ |
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| 767 | protected function cleanHtmlWrapper( |
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| 838 | |||
| 839 | /** |
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| 840 | * Retrieve an external iterator. |
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| 841 | * |
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| 842 | * @see http://php.net/manual/en/iteratoraggregate.getiterator.php |
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| 843 | * |
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| 844 | * @return SimpleHtmlDomNode |
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| 845 | * <p> |
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| 846 | * An instance of an object implementing <b>Iterator</b> or |
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| 847 | * <b>Traversable</b> |
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| 848 | * </p> |
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| 849 | */ |
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| 850 | View Code Duplication | public function getIterator(): SimpleHtmlDomNodeInterface |
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| 861 | |||
| 862 | /** |
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| 863 | * Get dom node's inner html. |
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| 864 | * |
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| 865 | * @param bool $multiDecodeNewHtmlEntity |
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| 866 | * |
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| 867 | * @return string |
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| 868 | */ |
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| 869 | public function innerXml(bool $multiDecodeNewHtmlEntity = false): string |
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| 873 | |||
| 874 | /** |
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| 875 | * Normalize the given input for comparision. |
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| 876 | * |
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| 877 | * @param HtmlDomParser|string $input |
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| 878 | * |
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| 879 | * @return string |
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| 880 | */ |
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| 881 | private function normalizeStringForComparision($input): string |
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| 917 | } |
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| 918 |
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