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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\DiscussionTools; |
| 4 | |
| 5 | use DOMException; |
| 6 | use RuntimeException; |
| 7 | use Wikimedia\Assert\Assert; |
| 8 | use Wikimedia\Parsoid\DOM\CharacterData; |
| 9 | use Wikimedia\Parsoid\DOM\Comment; |
| 10 | use Wikimedia\Parsoid\DOM\Document; |
| 11 | use Wikimedia\Parsoid\DOM\DocumentFragment; |
| 12 | use Wikimedia\Parsoid\DOM\DocumentType; |
| 13 | use Wikimedia\Parsoid\DOM\Node; |
| 14 | use Wikimedia\Parsoid\DOM\ProcessingInstruction; |
| 15 | use Wikimedia\Parsoid\DOM\Text; |
| 16 | |
| 17 | /** |
| 18 | * ImmutableRange has a similar API to the DOM Range class. |
| 19 | * |
| 20 | * start/endContainer and offsets can be accessed, as can commonAncestorContainer |
| 21 | * which is lazy evaluated. |
| 22 | * |
| 23 | * setStart and setEnd are still available but return a cloned range. |
| 24 | * |
| 25 | * @property bool $collapsed |
| 26 | * @property Node $commonAncestorContainer |
| 27 | * @property Node $endContainer |
| 28 | * @property int $endOffset |
| 29 | * @property Node $startContainer |
| 30 | * @property int $startOffset |
| 31 | */ |
| 32 | class ImmutableRange { |
| 33 | private ?Node $mCommonAncestorContainer = null; |
| 34 | private Node $mEndContainer; |
| 35 | private int $mEndOffset; |
| 36 | private Node $mStartContainer; |
| 37 | private int $mStartOffset; |
| 38 | |
| 39 | /** |
| 40 | * Find the common ancestor container of two nodes |
| 41 | * |
| 42 | * @param Node $a |
| 43 | * @param Node $b |
| 44 | * @return Node Common ancestor container |
| 45 | */ |
| 46 | private static function findCommonAncestorContainer( Node $a, Node $b ): Node { |
| 47 | $ancestorsA = []; |
| 48 | $ancestorsB = []; |
| 49 | |
| 50 | $parent = $a; |
| 51 | do { |
| 52 | // While walking up the parents of $a we found $b is a parent of $a or even identical |
| 53 | if ( $parent === $b ) { |
| 54 | return $b; |
| 55 | } |
| 56 | $ancestorsA[] = $parent; |
| 57 | } while ( $parent = $parent->parentNode ); |
| 58 | |
| 59 | $parent = $b; |
| 60 | do { |
| 61 | // While walking up the parents of $b we found $a is a parent of $b or even identical |
| 62 | if ( $parent === $a ) { |
| 63 | return $a; |
| 64 | } |
| 65 | $ancestorsB[] = $parent; |
| 66 | } while ( $parent = $parent->parentNode ); |
| 67 | |
| 68 | $node = null; |
| 69 | // Start with the top-most (hopefully) identical root node, walk down, skip everything |
| 70 | // that's identical, and stop at the first mismatch |
| 71 | $indexA = count( $ancestorsA ); |
| 72 | $indexB = count( $ancestorsB ); |
| 73 | while ( $indexA-- && $indexB-- && $ancestorsA[$indexA] === $ancestorsB[$indexB] ) { |
| 74 | // Remember the last match closest to $a and $b |
| 75 | $node = $ancestorsA[$indexA]; |
| 76 | } |
| 77 | |
| 78 | if ( !$node ) { |
| 79 | throw new DOMException( 'Nodes are not in the same document' ); |
| 80 | } |
| 81 | |
| 82 | return $node; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Get the root ancestor of a node |
| 87 | */ |
| 88 | private static function getRootNode( Node $node ): Node { |
| 89 | while ( $node->parentNode ) { |
| 90 | $node = $node->parentNode; |
| 91 | '@phan-var Node $node'; |
| 92 | } |
| 93 | |
| 94 | return $node; |
| 95 | } |
| 96 | |
| 97 | public function __construct( |
| 98 | Node $startNode, int $startOffset, Node $endNode, int $endOffset |
| 99 | ) { |
| 100 | $this->mStartContainer = $startNode; |
| 101 | $this->mStartOffset = $startOffset; |
| 102 | $this->mEndContainer = $endNode; |
| 103 | $this->mEndOffset = $endOffset; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * @param string $field Field name |
| 108 | * @return mixed |
| 109 | */ |
| 110 | public function __get( string $field ) { |
| 111 | switch ( $field ) { |
| 112 | case 'collapsed': |
| 113 | return $this->mStartContainer === $this->mEndContainer && |
| 114 | $this->mStartOffset === $this->mEndOffset; |
| 115 | case 'commonAncestorContainer': |
| 116 | if ( !$this->mCommonAncestorContainer ) { |
| 117 | $this->mCommonAncestorContainer = |
| 118 | static::findCommonAncestorContainer( $this->mStartContainer, $this->mEndContainer ); |
| 119 | } |
| 120 | return $this->mCommonAncestorContainer; |
| 121 | case 'endContainer': |
| 122 | return $this->mEndContainer; |
| 123 | case 'endOffset': |
| 124 | return $this->mEndOffset; |
| 125 | case 'startContainer': |
| 126 | return $this->mStartContainer; |
| 127 | case 'startOffset': |
| 128 | return $this->mStartOffset; |
| 129 | default: |
| 130 | throw new RuntimeException( 'Invalid property: ' . $field ); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Clone range with a new start position |
| 136 | */ |
| 137 | public function setStart( Node $startNode, int $startOffset ): self { |
| 138 | return $this->setStartOrEnd( 'start', $startNode, $startOffset ); |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Clone range with a new end position |
| 143 | */ |
| 144 | public function setEnd( Node $endNode, int $endOffset ): self { |
| 145 | return $this->setStartOrEnd( 'end', $endNode, $endOffset ); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Sets the start or end boundary point for the Range. |
| 150 | * |
| 151 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 152 | * @see https://dom.spec.whatwg.org/#concept-range-bp-set |
| 153 | * |
| 154 | * @param string $type Which boundary point should be set. Valid values are start or end. |
| 155 | * @param Node $node The Node that will become the boundary. |
| 156 | * @param int $offset The offset within the given Node that will be the boundary. |
| 157 | * @return self |
| 158 | */ |
| 159 | private function setStartOrEnd( string $type, Node $node, int $offset ): self { |
| 160 | if ( $node instanceof DocumentType ) { |
| 161 | throw new DOMException(); |
| 162 | } |
| 163 | |
| 164 | switch ( $type ) { |
| 165 | case 'start': |
| 166 | $endContainer = $this->mEndContainer; |
| 167 | $endOffset = $this->mEndOffset; |
| 168 | if ( |
| 169 | self::getRootNode( $this->mStartContainer ) !== self::getRootNode( $node ) || |
| 170 | $this->computePosition( |
| 171 | $node, $offset, $this->mEndContainer, $this->mEndOffset |
| 172 | ) === 'after' |
| 173 | ) { |
| 174 | $endContainer = $node; |
| 175 | $endOffset = $offset; |
| 176 | } |
| 177 | |
| 178 | return new self( |
| 179 | $node, $offset, $endContainer, $endOffset |
| 180 | ); |
| 181 | |
| 182 | case 'end': |
| 183 | $startContainer = $this->mStartContainer; |
| 184 | $startOffset = $this->mStartOffset; |
| 185 | if ( |
| 186 | self::getRootNode( $this->mStartContainer ) !== self::getRootNode( $node ) || |
| 187 | $this->computePosition( |
| 188 | $node, $offset, $this->mStartContainer, $this->mStartOffset |
| 189 | ) === 'before' |
| 190 | ) { |
| 191 | $startContainer = $node; |
| 192 | $startOffset = $offset; |
| 193 | } |
| 194 | |
| 195 | return new self( |
| 196 | $startContainer, $startOffset, $node, $offset |
| 197 | ); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Returns true if only a portion of the Node is contained within the Range. |
| 203 | * |
| 204 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 205 | * @see https://dom.spec.whatwg.org/#partially-contained |
| 206 | * |
| 207 | * @param Node $node The Node to check against. |
| 208 | * @return bool |
| 209 | */ |
| 210 | private function isPartiallyContainedNode( Node $node ): bool { |
| 211 | return CommentUtils::contains( $node, $this->mStartContainer ) xor |
| 212 | CommentUtils::contains( $node, $this->mEndContainer ); |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Returns true if the entire Node is within the Range, otherwise false. |
| 217 | * |
| 218 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 219 | * @see https://dom.spec.whatwg.org/#contained |
| 220 | * |
| 221 | * @param Node $node The Node to check against. |
| 222 | * @return bool |
| 223 | */ |
| 224 | private function isFullyContainedNode( Node $node ): bool { |
| 225 | return static::getRootNode( $node ) === static::getRootNode( $this->mStartContainer ) |
| 226 | && $this->computePosition( $node, 0, $this->mStartContainer, $this->mStartOffset ) === 'after' |
| 227 | && $this->computePosition( |
| 228 | // @phan-suppress-next-line PhanUndeclaredProperty |
| 229 | $node, $node->length ?? $node->childNodes->length, |
| 230 | $this->mEndContainer, $this->mEndOffset |
| 231 | ) === 'before'; |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * Extracts the content of the Range from the node tree and places it in a |
| 236 | * DocumentFragment. |
| 237 | * |
| 238 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 239 | * @see https://dom.spec.whatwg.org/#dom-range-extractcontents |
| 240 | */ |
| 241 | public function extractContents(): DocumentFragment { |
| 242 | $fragment = $this->mStartContainer->ownerDocument->createDocumentFragment(); |
| 243 | |
| 244 | if ( |
| 245 | $this->mStartContainer === $this->mEndContainer |
| 246 | && $this->mStartOffset === $this->mEndOffset |
| 247 | ) { |
| 248 | return $fragment; |
| 249 | } |
| 250 | |
| 251 | $originalStartNode = $this->mStartContainer; |
| 252 | $originalStartOffset = $this->mStartOffset; |
| 253 | $originalEndNode = $this->mEndContainer; |
| 254 | $originalEndOffset = $this->mEndOffset; |
| 255 | |
| 256 | if ( |
| 257 | $originalStartNode === $originalEndNode |
| 258 | && ( $originalStartNode instanceof Text |
| 259 | || $originalStartNode instanceof ProcessingInstruction |
| 260 | || $originalStartNode instanceof Comment ) |
| 261 | ) { |
| 262 | $clone = $originalStartNode->cloneNode(); |
| 263 | Assert::precondition( $clone instanceof CharacterData, 'TODO' ); |
| 264 | $clone->data = $originalStartNode->substringData( |
| 265 | $originalStartOffset, |
| 266 | $originalEndOffset - $originalStartOffset |
| 267 | ); |
| 268 | $fragment->appendChild( $clone ); |
| 269 | $originalStartNode->replaceData( |
| 270 | $originalStartOffset, |
| 271 | $originalEndOffset - $originalStartOffset, |
| 272 | '' |
| 273 | ); |
| 274 | |
| 275 | return $fragment; |
| 276 | } |
| 277 | |
| 278 | $commonAncestor = $this->commonAncestorContainer; |
| 279 | // It should be impossible for common ancestor to be null here since both nodes should be |
| 280 | // in the same tree. |
| 281 | Assert::precondition( $commonAncestor !== null, 'TODO' ); |
| 282 | $firstPartiallyContainedChild = null; |
| 283 | |
| 284 | if ( !CommentUtils::contains( $originalStartNode, $originalEndNode ) ) { |
| 285 | foreach ( $commonAncestor->childNodes as $node ) { |
| 286 | if ( $this->isPartiallyContainedNode( $node ) ) { |
| 287 | $firstPartiallyContainedChild = $node; |
| 288 | |
| 289 | break; |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | $lastPartiallyContainedChild = null; |
| 295 | |
| 296 | if ( !CommentUtils::contains( $originalEndNode, $originalStartNode ) ) { |
| 297 | $node = $commonAncestor->lastChild; |
| 298 | |
| 299 | while ( $node ) { |
| 300 | if ( $this->isPartiallyContainedNode( $node ) ) { |
| 301 | $lastPartiallyContainedChild = $node; |
| 302 | |
| 303 | break; |
| 304 | } |
| 305 | |
| 306 | $node = $node->previousSibling; |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | $containedChildren = []; |
| 311 | |
| 312 | foreach ( $commonAncestor->childNodes as $childNode ) { |
| 313 | if ( $this->isFullyContainedNode( $childNode ) ) { |
| 314 | if ( $childNode instanceof DocumentType ) { |
| 315 | throw new DOMException(); |
| 316 | } |
| 317 | |
| 318 | $containedChildren[] = $childNode; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | if ( CommentUtils::contains( $originalStartNode, $originalEndNode ) ) { |
| 323 | $newNode = $originalStartNode; |
| 324 | $newOffset = $originalStartOffset; |
| 325 | } else { |
| 326 | $referenceNode = $originalStartNode; |
| 327 | $parent = $referenceNode->parentNode; |
| 328 | |
| 329 | while ( $parent && !CommentUtils::contains( $parent, $originalEndNode ) ) { |
| 330 | $referenceNode = $parent; |
| 331 | $parent = $referenceNode->parentNode; |
| 332 | } |
| 333 | |
| 334 | // Note: If reference node’s parent is null, it would be the root of range, so would be an inclusive |
| 335 | // ancestor of original end node, and we could not reach this point. |
| 336 | Assert::precondition( $parent !== null, 'TODO' ); |
| 337 | $newNode = $parent; |
| 338 | $newOffset = CommentUtils::childIndexOf( $referenceNode ) + 1; |
| 339 | } |
| 340 | |
| 341 | if ( |
| 342 | $firstPartiallyContainedChild instanceof Text |
| 343 | || $firstPartiallyContainedChild instanceof ProcessingInstruction |
| 344 | || $firstPartiallyContainedChild instanceof Comment |
| 345 | ) { |
| 346 | // Note: In this case, first partially contained child is original start node. |
| 347 | Assert::precondition( $originalStartNode instanceof CharacterData, 'TODO' ); |
| 348 | $clone = $originalStartNode->cloneNode(); |
| 349 | Assert::precondition( $clone instanceof CharacterData, 'TODO' ); |
| 350 | $clone->data = $originalStartNode->substringData( |
| 351 | $originalStartOffset, |
| 352 | $originalStartNode->length - $originalStartOffset |
| 353 | ); |
| 354 | $fragment->appendChild( $clone ); |
| 355 | $originalStartNode->replaceData( |
| 356 | $originalStartOffset, |
| 357 | $originalStartNode->length - $originalStartOffset, |
| 358 | '' |
| 359 | ); |
| 360 | } elseif ( $firstPartiallyContainedChild ) { |
| 361 | $clone = $firstPartiallyContainedChild->cloneNode(); |
| 362 | $fragment->appendChild( $clone ); |
| 363 | $subrange = clone $this; |
| 364 | $subrange->mStartContainer = $originalStartNode; |
| 365 | $subrange->mStartOffset = $originalStartOffset; |
| 366 | $subrange->mEndContainer = $firstPartiallyContainedChild; |
| 367 | $subrange->mEndOffset = count( $firstPartiallyContainedChild->childNodes ); |
| 368 | $subfragment = $subrange->extractContents(); |
| 369 | $clone->appendChild( $subfragment ); |
| 370 | } |
| 371 | |
| 372 | foreach ( $containedChildren as $child ) { |
| 373 | $fragment->appendChild( $child ); |
| 374 | } |
| 375 | |
| 376 | if ( |
| 377 | $lastPartiallyContainedChild instanceof Text |
| 378 | || $lastPartiallyContainedChild instanceof ProcessingInstruction |
| 379 | || $lastPartiallyContainedChild instanceof Comment |
| 380 | ) { |
| 381 | // Note: In this case, last partially contained child is original end node. |
| 382 | Assert::precondition( $originalEndNode instanceof CharacterData, 'TODO' ); |
| 383 | $clone = $originalEndNode->cloneNode(); |
| 384 | Assert::precondition( $clone instanceof CharacterData, 'TODO' ); |
| 385 | $clone->data = $originalEndNode->substringData( 0, $originalEndOffset ); |
| 386 | $fragment->appendChild( $clone ); |
| 387 | $originalEndNode->replaceData( 0, $originalEndOffset, '' ); |
| 388 | } elseif ( $lastPartiallyContainedChild ) { |
| 389 | $clone = $lastPartiallyContainedChild->cloneNode(); |
| 390 | $fragment->appendChild( $clone ); |
| 391 | $subrange = clone $this; |
| 392 | $subrange->mStartContainer = $lastPartiallyContainedChild; |
| 393 | $subrange->mStartOffset = 0; |
| 394 | $subrange->mEndContainer = $originalEndNode; |
| 395 | $subrange->mEndOffset = $originalEndOffset; |
| 396 | $subfragment = $subrange->extractContents(); |
| 397 | $clone->appendChild( $subfragment ); |
| 398 | } |
| 399 | |
| 400 | $this->mStartContainer = $newNode; |
| 401 | $this->mStartOffset = $newOffset; |
| 402 | $this->mEndContainer = $newNode; |
| 403 | $this->mEndOffset = $newOffset; |
| 404 | |
| 405 | return $fragment; |
| 406 | } |
| 407 | |
| 408 | /** |
| 409 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 410 | * @see https://dom.spec.whatwg.org/#dom-range-clonecontents |
| 411 | */ |
| 412 | public function cloneContents(): DocumentFragment { |
| 413 | $ownerDocument = $this->mStartContainer->ownerDocument; |
| 414 | $fragment = $ownerDocument->createDocumentFragment(); |
| 415 | |
| 416 | if ( $this->mStartContainer === $this->mEndContainer |
| 417 | && $this->mStartOffset === $this->mEndOffset |
| 418 | ) { |
| 419 | return $fragment; |
| 420 | } |
| 421 | |
| 422 | $originalStartContainer = $this->mStartContainer; |
| 423 | $originalStartOffset = $this->mStartOffset; |
| 424 | $originalEndContainer = $this->mEndContainer; |
| 425 | $originalEndOffset = $this->mEndOffset; |
| 426 | |
| 427 | if ( $originalStartContainer === $originalEndContainer |
| 428 | && ( $originalStartContainer instanceof Text |
| 429 | || $originalStartContainer instanceof ProcessingInstruction |
| 430 | || $originalStartContainer instanceof Comment ) |
| 431 | ) { |
| 432 | $clone = $originalStartContainer->cloneNode(); |
| 433 | $clone->nodeValue = $originalStartContainer->substringData( |
| 434 | $originalStartOffset, |
| 435 | $originalEndOffset - $originalStartOffset |
| 436 | ); |
| 437 | $fragment->appendChild( $clone ); |
| 438 | |
| 439 | return $fragment; |
| 440 | } |
| 441 | |
| 442 | $commonAncestor = static::findCommonAncestorContainer( |
| 443 | $originalStartContainer, |
| 444 | $originalEndContainer |
| 445 | ); |
| 446 | $firstPartiallyContainedChild = null; |
| 447 | |
| 448 | if ( !CommentUtils::contains( $originalStartContainer, $originalEndContainer ) ) { |
| 449 | foreach ( $commonAncestor->childNodes as $node ) { |
| 450 | if ( $this->isPartiallyContainedNode( $node ) ) { |
| 451 | $firstPartiallyContainedChild = $node; |
| 452 | break; |
| 453 | } |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | $lastPartiallyContainedChild = null; |
| 458 | |
| 459 | // Upstream uses lastChild then iterates over previousSibling, however this |
| 460 | // is much slower that copying all the nodes to an array, at least when using |
| 461 | // a native DOMNode, presumably because previousSibling is lazy-evaluated. |
| 462 | if ( !CommentUtils::contains( $originalEndContainer, $originalStartContainer ) ) { |
| 463 | $childNodes = iterator_to_array( $commonAncestor->childNodes ); |
| 464 | |
| 465 | foreach ( array_reverse( $childNodes ) as $node ) { |
| 466 | if ( $this->isPartiallyContainedNode( $node ) ) { |
| 467 | $lastPartiallyContainedChild = $node; |
| 468 | break; |
| 469 | } |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | $containedChildrenStart = null; |
| 474 | $containedChildrenEnd = null; |
| 475 | |
| 476 | $child = $firstPartiallyContainedChild ?: $commonAncestor->firstChild; |
| 477 | for ( ; $child; $child = $child->nextSibling ) { |
| 478 | if ( $this->isFullyContainedNode( $child ) ) { |
| 479 | $containedChildrenStart = $child; |
| 480 | break; |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | $child = $lastPartiallyContainedChild ?: $commonAncestor->lastChild; |
| 485 | for ( ; $child !== $containedChildrenStart; $child = $child->previousSibling ) { |
| 486 | if ( $this->isFullyContainedNode( $child ) ) { |
| 487 | $containedChildrenEnd = $child; |
| 488 | break; |
| 489 | } |
| 490 | } |
| 491 | if ( !$containedChildrenEnd ) { |
| 492 | $containedChildrenEnd = $containedChildrenStart; |
| 493 | } |
| 494 | |
| 495 | // $containedChildrenStart and $containedChildrenEnd may be null here, but this loop still works correctly |
| 496 | for ( $child = $containedChildrenStart; $child !== $containedChildrenEnd; $child = $child->nextSibling ) { |
| 497 | if ( $child instanceof DocumentType ) { |
| 498 | throw new DOMException(); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | if ( $firstPartiallyContainedChild instanceof Text |
| 503 | || $firstPartiallyContainedChild instanceof ProcessingInstruction |
| 504 | || $firstPartiallyContainedChild instanceof Comment |
| 505 | ) { |
| 506 | $clone = $originalStartContainer->cloneNode(); |
| 507 | Assert::precondition( |
| 508 | $firstPartiallyContainedChild === $originalStartContainer, |
| 509 | 'Only possible when the node is the startContainer' |
| 510 | ); |
| 511 | $clone->nodeValue = $firstPartiallyContainedChild->substringData( |
| 512 | $originalStartOffset, |
| 513 | $firstPartiallyContainedChild->length - $originalStartOffset |
| 514 | ); |
| 515 | $fragment->appendChild( $clone ); |
| 516 | } elseif ( $firstPartiallyContainedChild ) { |
| 517 | $clone = $firstPartiallyContainedChild->cloneNode(); |
| 518 | $fragment->appendChild( $clone ); |
| 519 | $subrange = new self( |
| 520 | $originalStartContainer, $originalStartOffset, |
| 521 | $firstPartiallyContainedChild, |
| 522 | // @phan-suppress-next-line PhanUndeclaredProperty |
| 523 | $firstPartiallyContainedChild->length ?? $firstPartiallyContainedChild->childNodes->length |
| 524 | ); |
| 525 | $subfragment = $subrange->cloneContents(); |
| 526 | if ( $subfragment->hasChildNodes() ) { |
| 527 | $clone->appendChild( $subfragment ); |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | // $containedChildrenStart and $containedChildrenEnd may be null here, but this loop still works correctly |
| 532 | for ( $child = $containedChildrenStart; $child !== $containedChildrenEnd; $child = $child->nextSibling ) { |
| 533 | $clone = $child->cloneNode( true ); |
| 534 | $fragment->appendChild( $clone ); |
| 535 | } |
| 536 | // If not null, this node wasn't processed by the loop |
| 537 | if ( $containedChildrenEnd ) { |
| 538 | $clone = $containedChildrenEnd->cloneNode( true ); |
| 539 | $fragment->appendChild( $clone ); |
| 540 | } |
| 541 | |
| 542 | if ( $lastPartiallyContainedChild instanceof Text |
| 543 | || $lastPartiallyContainedChild instanceof ProcessingInstruction |
| 544 | || $lastPartiallyContainedChild instanceof Comment |
| 545 | ) { |
| 546 | Assert::precondition( |
| 547 | $lastPartiallyContainedChild === $originalEndContainer, |
| 548 | 'Only possible when the node is the endContainer' |
| 549 | ); |
| 550 | $clone = $lastPartiallyContainedChild->cloneNode(); |
| 551 | $clone->nodeValue = $lastPartiallyContainedChild->substringData( |
| 552 | 0, |
| 553 | $originalEndOffset |
| 554 | ); |
| 555 | $fragment->appendChild( $clone ); |
| 556 | } elseif ( $lastPartiallyContainedChild ) { |
| 557 | $clone = $lastPartiallyContainedChild->cloneNode(); |
| 558 | $fragment->appendChild( $clone ); |
| 559 | $subrange = new self( |
| 560 | $lastPartiallyContainedChild, 0, |
| 561 | $originalEndContainer, $originalEndOffset |
| 562 | ); |
| 563 | $subfragment = $subrange->cloneContents(); |
| 564 | if ( $subfragment->hasChildNodes() ) { |
| 565 | $clone->appendChild( $subfragment ); |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | return $fragment; |
| 570 | } |
| 571 | |
| 572 | /** |
| 573 | * Inserts a new Node into at the start of the Range. |
| 574 | * |
| 575 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 576 | * |
| 577 | * @see https://dom.spec.whatwg.org/#dom-range-insertnode |
| 578 | * |
| 579 | * @param Node $node The Node to be inserted. |
| 580 | * @return void |
| 581 | */ |
| 582 | public function insertNode( Node $node ): void { |
| 583 | if ( ( $this->mStartContainer instanceof ProcessingInstruction |
| 584 | || $this->mStartContainer instanceof Comment ) |
| 585 | || ( $this->mStartContainer instanceof Text |
| 586 | && $this->mStartContainer->parentNode === null ) |
| 587 | ) { |
| 588 | throw new DOMException(); |
| 589 | } |
| 590 | |
| 591 | $referenceNode = null; |
| 592 | |
| 593 | if ( $this->mStartContainer instanceof Text ) { |
| 594 | $referenceNode = $this->mStartContainer; |
| 595 | } else { |
| 596 | $referenceNode = $this |
| 597 | ->mStartContainer |
| 598 | ->childNodes |
| 599 | ->item( $this->mStartOffset ); |
| 600 | } |
| 601 | |
| 602 | $parent = !$referenceNode |
| 603 | ? $this->mStartContainer |
| 604 | : $referenceNode->parentNode; |
| 605 | // TODO: Restore this validation check? |
| 606 | // $parent->ensurePreinsertionValidity( $node, $referenceNode ); |
| 607 | |
| 608 | if ( $this->mStartContainer instanceof Text ) { |
| 609 | $referenceNode = $this->mStartContainer->splitText( $this->mStartOffset ); |
| 610 | } |
| 611 | |
| 612 | if ( $node === $referenceNode ) { |
| 613 | $referenceNode = $referenceNode->nextSibling; |
| 614 | } |
| 615 | |
| 616 | if ( $node->parentNode ) { |
| 617 | $node->parentNode->removeChild( $node ); |
| 618 | } |
| 619 | |
| 620 | // TODO: Restore this validation check? |
| 621 | // $parent->preinsertNode( $node, $referenceNode ); |
| 622 | |
| 623 | // $referenceNode may be null, this is okay |
| 624 | $parent->insertBefore( $node, $referenceNode ); |
| 625 | } |
| 626 | |
| 627 | /** |
| 628 | * Wraps the content of Range in a new Node and inserts it in to the Document. |
| 629 | * |
| 630 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 631 | * |
| 632 | * @see https://dom.spec.whatwg.org/#dom-range-surroundcontents |
| 633 | * |
| 634 | * @param Node $newParent New parent node for contents |
| 635 | * @return void |
| 636 | */ |
| 637 | public function surroundContents( Node $newParent ): void { |
| 638 | $commonAncestor = $this->commonAncestorContainer; |
| 639 | |
| 640 | if ( $commonAncestor ) { |
| 641 | $tw = new TreeWalker( $commonAncestor ); |
| 642 | $node = $tw->nextNode(); |
| 643 | |
| 644 | while ( $node ) { |
| 645 | if ( !$node instanceof Text && $this->isPartiallyContainedNode( $node ) ) { |
| 646 | throw new DOMException(); |
| 647 | } |
| 648 | |
| 649 | $node = $tw->nextNode(); |
| 650 | } |
| 651 | } |
| 652 | |
| 653 | if ( |
| 654 | $newParent instanceof Document |
| 655 | || $newParent instanceof DocumentType |
| 656 | || $newParent instanceof DocumentFragment |
| 657 | ) { |
| 658 | throw new DOMException(); |
| 659 | } |
| 660 | |
| 661 | $fragment = $this->extractContents(); |
| 662 | |
| 663 | while ( $newParent->firstChild ) { |
| 664 | $newParent->removeChild( $newParent->firstChild ); |
| 665 | } |
| 666 | |
| 667 | $this->insertNode( $newParent ); |
| 668 | $newParent->appendChild( $fragment ); |
| 669 | // TODO: Return new range? |
| 670 | } |
| 671 | |
| 672 | /** |
| 673 | * Compares the position of two boundary points. |
| 674 | * |
| 675 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 676 | * @internal |
| 677 | * |
| 678 | * @see https://dom.spec.whatwg.org/#concept-range-bp-position |
| 679 | * |
| 680 | * @param Node $nodeA |
| 681 | * @param int $offsetA |
| 682 | * @param Node $nodeB |
| 683 | * @param int $offsetB |
| 684 | * @return string 'before'|'after'|'equal' |
| 685 | */ |
| 686 | private function computePosition( |
| 687 | Node $nodeA, int $offsetA, Node $nodeB, int $offsetB |
| 688 | ): string { |
| 689 | // 1. Assert: nodeA and nodeB have the same root. |
| 690 | // Removed, not necessary for our usage |
| 691 | |
| 692 | // 2. If nodeA is nodeB, then return equal if offsetA is offsetB, before if offsetA is less than offsetB, and |
| 693 | // after if offsetA is greater than offsetB. |
| 694 | if ( $nodeA === $nodeB ) { |
| 695 | if ( $offsetA === $offsetB ) { |
| 696 | return 'equal'; |
| 697 | } elseif ( $offsetA < $offsetB ) { |
| 698 | return 'before'; |
| 699 | } else { |
| 700 | return 'after'; |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | $commonAncestor = $this->findCommonAncestorContainer( $nodeB, $nodeA ); |
| 705 | if ( $commonAncestor === $nodeA ) { |
| 706 | $AFollowsB = false; |
| 707 | } elseif ( $commonAncestor === $nodeB ) { |
| 708 | $AFollowsB = true; |
| 709 | } else { |
| 710 | // A was not found inside B. Traverse both A & B up to the nodes |
| 711 | // before their common ancestor, then see if A is in the nextSibling |
| 712 | // chain of B. |
| 713 | $b = $nodeB; |
| 714 | while ( $b->parentNode !== $commonAncestor ) { |
| 715 | $b = $b->parentNode; |
| 716 | } |
| 717 | $a = $nodeA; |
| 718 | while ( $a->parentNode !== $commonAncestor ) { |
| 719 | $a = $a->parentNode; |
| 720 | } |
| 721 | $AFollowsB = false; |
| 722 | while ( $b ) { |
| 723 | if ( $a === $b ) { |
| 724 | $AFollowsB = true; |
| 725 | break; |
| 726 | } |
| 727 | $b = $b->nextSibling; |
| 728 | } |
| 729 | } |
| 730 | |
| 731 | if ( $AFollowsB ) { |
| 732 | // Swap variables |
| 733 | [ $nodeB, $nodeA ] = [ $nodeA, $nodeB ]; |
| 734 | [ $offsetB, $offsetA ] = [ $offsetA, $offsetB ]; |
| 735 | } |
| 736 | |
| 737 | $ancestor = $nodeB->parentNode; |
| 738 | |
| 739 | while ( $ancestor ) { |
| 740 | if ( $ancestor === $nodeA ) { |
| 741 | break; |
| 742 | } |
| 743 | |
| 744 | $ancestor = $ancestor->parentNode; |
| 745 | } |
| 746 | |
| 747 | if ( $ancestor ) { |
| 748 | $child = $nodeB; |
| 749 | |
| 750 | while ( $child ) { |
| 751 | if ( $child->parentNode === $nodeA ) { |
| 752 | break; |
| 753 | } |
| 754 | |
| 755 | $child = $child->parentNode; |
| 756 | } |
| 757 | |
| 758 | // Phan complains that $child may be null here, but that can't happen, because at this point |
| 759 | // we know that $nodeA is an ancestor of $nodeB, so the loop above will stop before the root. |
| 760 | // @phan-suppress-next-line PhanTypeMismatchArgumentNullable |
| 761 | if ( CommentUtils::childIndexOf( $child ) < $offsetA ) { |
| 762 | return $AFollowsB ? 'before' : 'after'; |
| 763 | } |
| 764 | } |
| 765 | |
| 766 | return $AFollowsB ? 'after' : 'before'; |
| 767 | } |
| 768 | |
| 769 | public const START_TO_START = 0; |
| 770 | public const START_TO_END = 1; |
| 771 | public const END_TO_END = 2; |
| 772 | public const END_TO_START = 3; |
| 773 | |
| 774 | /** |
| 775 | * Compares the boundary points of this Range with another Range. |
| 776 | * |
| 777 | * Ported from https://github.com/TRowbotham/PHPDOM (MIT) |
| 778 | * |
| 779 | * @see https://dom.spec.whatwg.org/#dom-range-compareboundarypoints |
| 780 | * |
| 781 | * @param int $how One of ImmutableRange::END_TO_END, ImmutableRange::END_TO_START, |
| 782 | * ImmutableRange::START_TO_END, ImmutableRange::START_TO_START |
| 783 | * @param ImmutableRange $sourceRange A Range whose boundary points are to be compared. |
| 784 | * @return int -1, 0, or 1 |
| 785 | */ |
| 786 | public function compareBoundaryPoints( int $how, self $sourceRange ): int { |
| 787 | if ( static::getRootNode( $this->mStartContainer ) !== static::getRootNode( $sourceRange->startContainer ) ) { |
| 788 | throw new DOMException(); |
| 789 | } |
| 790 | |
| 791 | switch ( $how ) { |
| 792 | case static::START_TO_START: |
| 793 | $thisPoint = [ $this->mStartContainer, $this->mStartOffset ]; |
| 794 | $otherPoint = [ $sourceRange->startContainer, $sourceRange->startOffset ]; |
| 795 | break; |
| 796 | |
| 797 | case static::START_TO_END: |
| 798 | $thisPoint = [ $this->mEndContainer, $this->mEndOffset ]; |
| 799 | $otherPoint = [ $sourceRange->startContainer, $sourceRange->startOffset ]; |
| 800 | break; |
| 801 | |
| 802 | case static::END_TO_END: |
| 803 | $thisPoint = [ $this->mEndContainer, $this->mEndOffset ]; |
| 804 | $otherPoint = [ $sourceRange->endContainer, $sourceRange->endOffset ]; |
| 805 | break; |
| 806 | |
| 807 | case static::END_TO_START: |
| 808 | $thisPoint = [ $this->mStartContainer, $this->mStartOffset ]; |
| 809 | $otherPoint = [ $sourceRange->endContainer, $sourceRange->endOffset ]; |
| 810 | break; |
| 811 | |
| 812 | default: |
| 813 | throw new DOMException(); |
| 814 | } |
| 815 | |
| 816 | switch ( $this->computePosition( ...$thisPoint, ...$otherPoint ) ) { |
| 817 | case 'before': |
| 818 | return -1; |
| 819 | |
| 820 | case 'equal': |
| 821 | return 0; |
| 822 | |
| 823 | case 'after': |
| 824 | return 1; |
| 825 | |
| 826 | default: |
| 827 | throw new DOMException(); |
| 828 | } |
| 829 | } |
| 830 | } |