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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Drupal\display_builder; |
| 6 | |
| 7 | use Drupal\Component\Plugin\PluginManagerInterface; |
| 8 | use Drupal\Component\Utility\NestedArray; |
| 9 | use Drupal\ui_patterns\SourceInterface; |
| 10 | |
| 11 | /** |
| 12 | * Manages hierarchical data with a high-performance normalized structure. |
| 13 | * |
| 14 | * This class converts nested source trees into a flat internal representation: |
| 15 | * - A 'nodes' map containing the raw configuration for each unique node. |
| 16 | * - A 'structure' map defining parent-child relationships and slot assignments. |
| 17 | * |
| 18 | * This normalization allows for O(1) or O(log N) operations when moving, |
| 19 | * updating, or retrieving specific nodes, regardless of tree depth. The |
| 20 | * tree is only denormalized back into a nested format when requested via |
| 21 | * ::getTree() for rendering or persistence. |
| 22 | */ |
| 23 | class SourceTree { |
| 24 | |
| 25 | /** |
| 26 | * Flat map of node data keyed by node_id. |
| 27 | */ |
| 28 | protected array $nodes = []; |
| 29 | |
| 30 | /** |
| 31 | * Hierarchical structure of node IDs. |
| 32 | */ |
| 33 | protected array $structure = []; |
| 34 | |
| 35 | /** |
| 36 | * List of root node IDs. |
| 37 | */ |
| 38 | protected array $root = []; |
| 39 | |
| 40 | /** |
| 41 | * Cached path index. |
| 42 | */ |
| 43 | protected ?array $pathIndex = NULL; |
| 44 | |
| 45 | /** |
| 46 | * The source plugin manager. |
| 47 | */ |
| 48 | protected ?PluginManagerInterface $sourceManager = NULL; |
| 49 | |
| 50 | /** |
| 51 | * Cache of resolved plugin classes keyed by source_id. |
| 52 | */ |
| 53 | protected array $pluginClassCache = []; |
| 54 | |
| 55 | /** |
| 56 | * Constructor. |
| 57 | * |
| 58 | * @param array $tree |
| 59 | * Initial nested tree data. |
| 60 | * @param \Drupal\Component\Plugin\PluginManagerInterface|null $sourceManager |
| 61 | * The source plugin manager. |
| 62 | */ |
| 63 | public function __construct(array $tree = [], ?PluginManagerInterface $sourceManager = NULL) { |
| 64 | $this->sourceManager = $sourceManager; |
| 65 | $this->rebuild($tree); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Rebuild the internal normalized state from a nested tree. |
| 70 | * |
| 71 | * @param array $tree |
| 72 | * The nested tree data. |
| 73 | */ |
| 74 | public function rebuild(array $tree): void { |
| 75 | $this->nodes = []; |
| 76 | $this->structure = []; |
| 77 | $this->pluginClassCache = []; |
| 78 | $this->root = $this->normalize($tree, NULL, NULL); |
| 79 | $this->pathIndex = NULL; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Get the nested tree data. |
| 84 | * |
| 85 | * @return array |
| 86 | * The full nested tree data. |
| 87 | */ |
| 88 | public function getTree(): array { |
| 89 | return $this->denormalize($this->root); |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Get the raw normalized structure (nodes, structure, root). |
| 94 | * |
| 95 | * Returns the internal flat representation before denormalization, useful |
| 96 | * for debugging and dev tooling. |
| 97 | * |
| 98 | * @return array |
| 99 | * An array with keys 'nodes', 'structure', and 'root'. |
| 100 | */ |
| 101 | public function getNormalizedStructure(): array { |
| 102 | return [ |
| 103 | 'nodes' => $this->nodes, |
| 104 | 'structure' => $this->structure, |
| 105 | 'root' => $this->root, |
| 106 | ]; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Get the path index. |
| 111 | * |
| 112 | * @return array |
| 113 | * The path index. |
| 114 | */ |
| 115 | public function getPathIndex(): array { |
| 116 | if ($this->pathIndex === NULL) { |
| 117 | $this->pathIndex = []; |
| 118 | $this->buildPathIndex($this->root, [], $this->pathIndex); |
| 119 | } |
| 120 | |
| 121 | return $this->pathIndex; |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Attach a new source to root. |
| 126 | * |
| 127 | * @param int $position |
| 128 | * The position in the root list. |
| 129 | * @param string $source_id |
| 130 | * The source plugin ID. |
| 131 | * @param array $source_data |
| 132 | * The source configuration data. |
| 133 | * |
| 134 | * @return string |
| 135 | * The new node ID. |
| 136 | */ |
| 137 | public function attachToRoot(int $position, string $source_id, array $source_data): string { |
| 138 | $node_id = $this->generateNodeId(); |
| 139 | $this->nodes[$node_id] = [ |
| 140 | 'source_id' => $source_id, |
| 141 | 'source' => $source_data, |
| 142 | ]; |
| 143 | $this->structure[$node_id] = [ |
| 144 | 'parent' => NULL, |
| 145 | 'slot' => NULL, |
| 146 | 'slots' => [], |
| 147 | ]; |
| 148 | \array_splice($this->root, $position, 0, [$node_id]); |
| 149 | $this->pathIndex = NULL; |
| 150 | |
| 151 | return $node_id; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Attach a new source to a slot. |
| 156 | * |
| 157 | * @param string $parent_id |
| 158 | * The parent node ID. |
| 159 | * @param string $slot_id |
| 160 | * The slot ID. |
| 161 | * @param int $position |
| 162 | * The position in the slot. |
| 163 | * @param string $source_id |
| 164 | * The source plugin ID. |
| 165 | * @param array $source_data |
| 166 | * The source configuration data. |
| 167 | * |
| 168 | * @return string|null |
| 169 | * The new node ID or NULL if parent not found. |
| 170 | */ |
| 171 | public function attachToSlot(string $parent_id, string $slot_id, int $position, string $source_id, array $source_data): ?string { |
| 172 | if (!isset($this->structure[$parent_id])) { |
| 173 | return NULL; |
| 174 | } |
| 175 | |
| 176 | $node_id = $this->generateNodeId(); |
| 177 | $this->nodes[$node_id] = [ |
| 178 | 'source_id' => $source_id, |
| 179 | 'source' => $source_data, |
| 180 | ]; |
| 181 | $this->structure[$node_id] = [ |
| 182 | 'parent' => $parent_id, |
| 183 | 'slot' => $slot_id, |
| 184 | 'slots' => [], |
| 185 | ]; |
| 186 | |
| 187 | if (!isset($this->structure[$parent_id]['slots'][$slot_id])) { |
| 188 | $this->structure[$parent_id]['slots'][$slot_id] = []; |
| 189 | } |
| 190 | \array_splice($this->structure[$parent_id]['slots'][$slot_id], $position, 0, [$node_id]); |
| 191 | $this->pathIndex = NULL; |
| 192 | |
| 193 | return $node_id; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Move node to root. |
| 198 | * |
| 199 | * @param string $node_id |
| 200 | * The node ID to move. |
| 201 | * @param int $position |
| 202 | * The new position in the root list. |
| 203 | * |
| 204 | * @return bool |
| 205 | * TRUE if success. |
| 206 | */ |
| 207 | public function moveToRoot(string $node_id, int $position): bool { |
| 208 | if (!$this->removeFromCurrentParent($node_id)) { |
| 209 | return FALSE; |
| 210 | } |
| 211 | |
| 212 | $this->structure[$node_id]['parent'] = NULL; |
| 213 | $this->structure[$node_id]['slot'] = NULL; |
| 214 | \array_splice($this->root, $position, 0, [$node_id]); |
| 215 | $this->pathIndex = NULL; |
| 216 | |
| 217 | return TRUE; |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * Move node to a slot. |
| 222 | * |
| 223 | * @param string $node_id |
| 224 | * The node ID to move. |
| 225 | * @param string $parent_id |
| 226 | * The target parent ID. |
| 227 | * @param string $slot_id |
| 228 | * The target slot ID. |
| 229 | * @param int $position |
| 230 | * The position in the target slot. |
| 231 | * |
| 232 | * @return bool |
| 233 | * TRUE if success. |
| 234 | */ |
| 235 | public function moveToSlot(string $node_id, string $parent_id, string $slot_id, int $position): bool { |
| 236 | if (!isset($this->structure[$parent_id])) { |
| 237 | return FALSE; |
| 238 | } |
| 239 | |
| 240 | // Forbidden move: moving a parent into its own descendant. |
| 241 | if ($this->isDescendant($parent_id, $node_id)) { |
| 242 | return FALSE; |
| 243 | } |
| 244 | |
| 245 | if (!$this->removeFromCurrentParent($node_id)) { |
| 246 | return FALSE; |
| 247 | } |
| 248 | |
| 249 | $this->structure[$node_id]['parent'] = $parent_id; |
| 250 | $this->structure[$node_id]['slot'] = $slot_id; |
| 251 | |
| 252 | if (!isset($this->structure[$parent_id]['slots'][$slot_id])) { |
| 253 | $this->structure[$parent_id]['slots'][$slot_id] = []; |
| 254 | } |
| 255 | \array_splice($this->structure[$parent_id]['slots'][$slot_id], $position, 0, [$node_id]); |
| 256 | $this->pathIndex = NULL; |
| 257 | |
| 258 | return TRUE; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Remove a node and its descendants. |
| 263 | * |
| 264 | * @param string $node_id |
| 265 | * The node ID to remove. |
| 266 | * |
| 267 | * @return bool |
| 268 | * TRUE if success. |
| 269 | */ |
| 270 | public function remove(string $node_id): bool { |
| 271 | if (!$this->removeFromCurrentParent($node_id)) { |
| 272 | return FALSE; |
| 273 | } |
| 274 | $this->recursiveRemove($node_id); |
| 275 | $this->pathIndex = NULL; |
| 276 | |
| 277 | return TRUE; |
| 278 | } |
| 279 | |
| 280 | /** |
| 281 | * Check if a node exists. |
| 282 | * |
| 283 | * @param string $node_id |
| 284 | * The node ID. |
| 285 | * |
| 286 | * @return bool |
| 287 | * TRUE if it exists. |
| 288 | */ |
| 289 | public function hasNode(string $node_id): bool { |
| 290 | return isset($this->nodes[$node_id]); |
| 291 | } |
| 292 | |
| 293 | /** |
| 294 | * Get flat node data (no children). |
| 295 | * |
| 296 | * @param string $node_id |
| 297 | * The node ID. |
| 298 | * |
| 299 | * @return array|null |
| 300 | * The flat node data or NULL. |
| 301 | */ |
| 302 | public function getNodeData(string $node_id): ?array { |
| 303 | return $this->nodes[$node_id] ?? NULL; |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * Get a node data by ID (nested subtree). |
| 308 | * |
| 309 | * @param string $node_id |
| 310 | * The node ID. |
| 311 | * |
| 312 | * @return array|null |
| 313 | * The node data (nested structure for that node) or NULL. |
| 314 | */ |
| 315 | public function getNode(string $node_id): ?array { |
| 316 | if (!isset($this->nodes[$node_id])) { |
| 317 | return NULL; |
| 318 | } |
| 319 | |
| 320 | return $this->denormalize([$node_id])[0]; |
| 321 | } |
| 322 | |
| 323 | /** |
| 324 | * Get the parent ID of a node. |
| 325 | * |
| 326 | * @param string $node_id |
| 327 | * The node ID. |
| 328 | * |
| 329 | * @return string|null |
| 330 | * The parent ID or NULL if at root. |
| 331 | */ |
| 332 | public function getParentId(string $node_id): ?string { |
| 333 | return $this->structure[$node_id]['parent'] ?? NULL; |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * Set source data for a node. |
| 338 | * |
| 339 | * @param string $node_id |
| 340 | * The node ID. |
| 341 | * @param string $source_id |
| 342 | * The source plugin ID. |
| 343 | * @param array $source_data |
| 344 | * The source configuration data. |
| 345 | * |
| 346 | * @return bool |
| 347 | * TRUE if success. |
| 348 | */ |
| 349 | public function setSource(string $node_id, string $source_id, array $source_data): bool { |
| 350 | if (!isset($this->nodes[$node_id])) { |
| 351 | return FALSE; |
| 352 | } |
| 353 | $this->nodes[$node_id]['source_id'] = $source_id; |
| 354 | $this->nodes[$node_id]['source'] = $source_data; |
| 355 | |
| 356 | return TRUE; |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * Set third party settings for a node. |
| 361 | * |
| 362 | * @param string $node_id |
| 363 | * The node ID. |
| 364 | * @param string $island_id |
| 365 | * The island (plugin) ID. |
| 366 | * @param array $data |
| 367 | * The third party settings data. |
| 368 | * |
| 369 | * @return bool |
| 370 | * TRUE if success. |
| 371 | */ |
| 372 | public function setThirdPartySettings(string $node_id, string $island_id, array $data): bool { |
| 373 | if (!isset($this->nodes[$node_id])) { |
| 374 | return FALSE; |
| 375 | } |
| 376 | |
| 377 | if (!isset($this->nodes[$node_id]['third_party_settings'])) { |
| 378 | $this->nodes[$node_id]['third_party_settings'] = []; |
| 379 | } |
| 380 | $this->nodes[$node_id]['third_party_settings'][$island_id] = $data; |
| 381 | |
| 382 | return TRUE; |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * Generate a unique node ID. |
| 387 | * |
| 388 | * @return string |
| 389 | * The generated node ID. |
| 390 | */ |
| 391 | protected function generateNodeId(): string { |
| 392 | return \bin2hex(\random_bytes(8)); |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * Normalize a nested tree into flat maps. |
| 397 | * |
| 398 | * @param array $items |
| 399 | * Nested items. |
| 400 | * @param string|null $parent_id |
| 401 | * Current parent ID. |
| 402 | * @param string|null $slot_id |
| 403 | * Current slot ID. |
| 404 | * |
| 405 | * @return array |
| 406 | * List of node IDs at this level. |
| 407 | */ |
| 408 | protected function normalize(array $items, ?string $parent_id, ?string $slot_id): array { |
| 409 | $ids = []; |
| 410 | |
| 411 | foreach ($items as $item) { |
| 412 | $node_id = $item['node_id'] ?? $this->generateNodeId(); |
| 413 | $ids[] = $node_id; |
| 414 | |
| 415 | $source_id = $item['source_id'] ?? ''; |
| 416 | $plugin = $this->getSourcePlugin($source_id, $item['source'] ?? []); |
| 417 | |
| 418 | $slots = []; |
| 419 | |
| 420 | if ($plugin instanceof SourceWithSlotsInterface) { |
| 421 | foreach ($plugin->getSlotValues() as $child_slot_id => $data) { |
| 422 | $slots[$child_slot_id] = $this->normalize($data, $node_id, $child_slot_id); |
| 423 | } |
| 424 | |
| 425 | foreach ($plugin->getSlotDefinitions() as $child_slot_id => $_) { |
| 426 | $path = $plugin::getSlotPath($child_slot_id); |
| 427 | NestedArray::unsetValue($item['source'], $path); |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | $item['node_id'] = $node_id; |
| 432 | $this->structure[$node_id] = [ |
| 433 | 'parent' => $parent_id, |
| 434 | 'slot' => $slot_id, |
| 435 | 'slots' => $slots, |
| 436 | ]; |
| 437 | $this->nodes[$node_id] = $item; |
| 438 | } |
| 439 | |
| 440 | return $ids; |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * Denormalize a list of node IDs into a nested tree. |
| 445 | * |
| 446 | * @param array $ids |
| 447 | * The IDs to assemble. |
| 448 | * |
| 449 | * @return array |
| 450 | * The nested tree. |
| 451 | */ |
| 452 | protected function denormalize(array $ids): array { |
| 453 | return \array_map(function ($id) { |
| 454 | $node = $this->nodes[$id]; |
| 455 | $node['node_id'] = $id; |
| 456 | |
| 457 | return $this->injectChildren($node, $this->structure[$id]['slots']); |
| 458 | }, $ids); |
| 459 | } |
| 460 | |
| 461 | /** |
| 462 | * Inject children IDs back into a node as nested data. |
| 463 | * |
| 464 | * @param array $node |
| 465 | * The node data. |
| 466 | * @param array $slots |
| 467 | * The slots with children IDs. |
| 468 | * |
| 469 | * @return array |
| 470 | * The node data with children injected. |
| 471 | */ |
| 472 | protected function injectChildren(array $node, array $slots): array { |
| 473 | if (empty($slots)) { |
| 474 | return $node; |
| 475 | } |
| 476 | |
| 477 | $source_id = $node['source_id'] ?? ''; |
| 478 | $class = $this->getPluginClass($source_id); |
| 479 | |
| 480 | if ($class && \is_subclass_of($class, SourceWithSlotsInterface::class)) { |
| 481 | foreach ($slots as $slot_id => $child_ids) { |
| 482 | $path = $class::getSlotPath($slot_id); |
| 483 | NestedArray::setValue($node['source'], $path, $this->denormalize($child_ids)); |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | return $node; |
| 488 | } |
| 489 | |
| 490 | /** |
| 491 | * Build the path index recursively. |
| 492 | * |
| 493 | * @param array $ids |
| 494 | * Current IDs level. |
| 495 | * @param array $current_path |
| 496 | * Current path keys. |
| 497 | * @param array $index |
| 498 | * The index to populate. |
| 499 | */ |
| 500 | protected function buildPathIndex(array $ids, array $current_path, array &$index): void { |
| 501 | foreach ($ids as $idx => $id) { |
| 502 | $path = [...$current_path, $idx]; |
| 503 | $index[$id] = [ |
| 504 | 'path' => $path, |
| 505 | 'parent' => $this->structure[$id]['parent'], |
| 506 | ]; |
| 507 | |
| 508 | $struct = $this->structure[$id]; |
| 509 | $source_id = $this->nodes[$id]['source_id']; |
| 510 | $class = $this->getPluginClass($source_id); |
| 511 | |
| 512 | foreach ($struct['slots'] as $slot_id => $child_ids) { |
| 513 | if ($class && \is_subclass_of($class, SourceWithSlotsInterface::class)) { |
| 514 | $child_path = [...$path, 'source', ...$class::getSlotPath($slot_id)]; |
| 515 | } |
| 516 | else { |
| 517 | continue; |
| 518 | } |
| 519 | $this->buildPathIndex($child_ids, $child_path, $index); |
| 520 | } |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | /** |
| 525 | * Remove a node from its parent's children list. |
| 526 | * |
| 527 | * @param string $node_id |
| 528 | * The node ID. |
| 529 | * |
| 530 | * @return bool |
| 531 | * TRUE if found and removed. |
| 532 | */ |
| 533 | protected function removeFromCurrentParent(string $node_id): bool { |
| 534 | if (!isset($this->structure[$node_id])) { |
| 535 | return FALSE; |
| 536 | } |
| 537 | |
| 538 | $parent_id = $this->structure[$node_id]['parent']; |
| 539 | $slot_id = $this->structure[$node_id]['slot']; |
| 540 | |
| 541 | if ($parent_id === NULL) { |
| 542 | $key = \array_search($node_id, $this->root, TRUE); |
| 543 | |
| 544 | if ($key === FALSE) { |
| 545 | return FALSE; |
| 546 | } |
| 547 | \array_splice($this->root, (int) $key, 1); |
| 548 | |
| 549 | return TRUE; |
| 550 | } |
| 551 | |
| 552 | if ($slot_id === NULL || !isset($this->structure[$parent_id]['slots'][$slot_id])) { |
| 553 | return FALSE; |
| 554 | } |
| 555 | |
| 556 | $child_ids = &$this->structure[$parent_id]['slots'][$slot_id]; |
| 557 | |
| 558 | if (!\is_array($child_ids)) { |
| 559 | return FALSE; |
| 560 | } |
| 561 | $key = \array_search($node_id, $child_ids, TRUE); |
| 562 | |
| 563 | if ($key !== FALSE) { |
| 564 | \array_splice($child_ids, (int) $key, 1); |
| 565 | |
| 566 | return TRUE; |
| 567 | } |
| 568 | |
| 569 | return FALSE; |
| 570 | } |
| 571 | |
| 572 | /** |
| 573 | * Recursively remove node and data. |
| 574 | * |
| 575 | * @param string $node_id |
| 576 | * The node ID. |
| 577 | */ |
| 578 | protected function recursiveRemove(string $node_id): void { |
| 579 | if (!isset($this->structure[$node_id])) { |
| 580 | return; |
| 581 | } |
| 582 | |
| 583 | foreach ($this->structure[$node_id]['slots'] as $child_ids) { |
| 584 | foreach ($child_ids as $child_id) { |
| 585 | $this->recursiveRemove($child_id); |
| 586 | } |
| 587 | } |
| 588 | unset($this->nodes[$node_id], $this->structure[$node_id]); |
| 589 | } |
| 590 | |
| 591 | /** |
| 592 | * Check if a node is a descendant of another. |
| 593 | * |
| 594 | * @param string $node_id |
| 595 | * The node ID to check. |
| 596 | * @param string $potential_ancestor_id |
| 597 | * The potential ancestor ID. |
| 598 | * |
| 599 | * @return bool |
| 600 | * TRUE if descendant. |
| 601 | */ |
| 602 | protected function isDescendant(string $node_id, string $potential_ancestor_id): bool { |
| 603 | $current_parent = $this->getParentId($node_id); |
| 604 | |
| 605 | while ($current_parent !== NULL) { |
| 606 | if ($current_parent === $potential_ancestor_id) { |
| 607 | return TRUE; |
| 608 | } |
| 609 | $current_parent = $this->getParentId($current_parent); |
| 610 | } |
| 611 | |
| 612 | return FALSE; |
| 613 | } |
| 614 | |
| 615 | /** |
| 616 | * Get source plugin instance. |
| 617 | * |
| 618 | * @param string $source_id |
| 619 | * The source plugin ID. |
| 620 | * @param array $source_configuration |
| 621 | * The source configuration. |
| 622 | * |
| 623 | * @return \Drupal\ui_patterns\SourceInterface|null |
| 624 | * The source plugin instance or NULL. |
| 625 | */ |
| 626 | protected function getSourcePlugin(string $source_id, array $source_configuration): ?SourceInterface { |
| 627 | try { |
| 628 | $plugin = $this->getSourceManager()->createInstance($source_id, ['settings' => $source_configuration]); |
| 629 | |
| 630 | return $plugin instanceof SourceInterface ? $plugin : NULL; |
| 631 | } |
| 632 | catch (\Exception $e) { |
| 633 | return NULL; |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | /** |
| 638 | * Get source plugin class. |
| 639 | * |
| 640 | * @param string $source_id |
| 641 | * The source plugin ID. |
| 642 | * |
| 643 | * @return string|null |
| 644 | * The plugin class or NULL. |
| 645 | */ |
| 646 | protected function getPluginClass(string $source_id): ?string { |
| 647 | if (\array_key_exists($source_id, $this->pluginClassCache)) { |
| 648 | return $this->pluginClassCache[$source_id]; |
| 649 | } |
| 650 | |
| 651 | try { |
| 652 | $definition = $this->getSourceManager()->getDefinition($source_id); |
| 653 | $this->pluginClassCache[$source_id] = $definition['class'] ?? NULL; |
| 654 | } |
| 655 | catch (\Exception $e) { |
| 656 | $this->pluginClassCache[$source_id] = NULL; |
| 657 | } |
| 658 | |
| 659 | return $this->pluginClassCache[$source_id]; |
| 660 | } |
| 661 | |
| 662 | /** |
| 663 | * Get source plugin manager. |
| 664 | * |
| 665 | * @return \Drupal\Component\Plugin\PluginManagerInterface |
| 666 | * The source plugin manager. |
| 667 | */ |
| 668 | protected function getSourceManager(): PluginManagerInterface { |
| 669 | if ($this->sourceManager === NULL) { |
| 670 | $this->sourceManager = \Drupal::service('plugin.manager.ui_patterns_source'); |
| 671 | } |
| 672 | |
| 673 | return $this->sourceManager; |
| 674 | } |
| 675 | |
| 676 | } |