1<?php
  2/**
  3 * Blocks API: WP_Block class
  4 *
  5 * @package WordPress
  6 * @since 5.5.0
  7 */
  8
  9/**
 10 * Class representing a parsed instance of a block.
 11 *
 12 * @since 5.5.0
 13 * @property array $attributes
 14 */
 15#[AllowDynamicProperties]
 16class WP_Block {
 17
 18	/**
 19	 * Original parsed array representation of block.
 20	 *
 21	 * @since 5.5.0
 22	 * @var array
 23	 */
 24	public $parsed_block;
 25
 26	/**
 27	 * Name of block.
 28	 *
 29	 * @example "core/paragraph"
 30	 *
 31	 * @since 5.5.0
 32	 * @var string|null
 33	 */
 34	public $name;
 35
 36	/**
 37	 * Block type associated with the instance.
 38	 *
 39	 * @since 5.5.0
 40	 * @var WP_Block_Type
 41	 */
 42	public $block_type;
 43
 44	/**
 45	 * Block context values.
 46	 *
 47	 * @since 5.5.0
 48	 * @var array
 49	 */
 50	public $context = array();
 51
 52	/**
 53	 * All available context of the current hierarchy.
 54	 *
 55	 * @since 5.5.0
 56	 * @var array
 57	 */
 58	protected $available_context = array();
 59
 60	/**
 61	 * Block type registry.
 62	 *
 63	 * @since 5.9.0
 64	 * @var WP_Block_Type_Registry
 65	 */
 66	protected $registry;
 67
 68	/**
 69	 * List of inner blocks (of this same class)
 70	 *
 71	 * @since 5.5.0
 72	 * @var WP_Block_List
 73	 */
 74	public $inner_blocks = array();
 75
 76	/**
 77	 * Resultant HTML from inside block comment delimiters after removing inner
 78	 * blocks.
 79	 *
 80	 * @example "...Just <!-- wp:test /--> testing..." -> "Just testing..."
 81	 *
 82	 * @since 5.5.0
 83	 * @var string
 84	 */
 85	public $inner_html = '';
 86
 87	/**
 88	 * List of string fragments and null markers where inner blocks were found
 89	 *
 90	 * @example array(
 91	 *   'inner_html'    => 'BeforeInnerAfter',
 92	 *   'inner_blocks'  => array( block, block ),
 93	 *   'inner_content' => array( 'Before', null, 'Inner', null, 'After' ),
 94	 * )
 95	 *
 96	 * @since 5.5.0
 97	 * @var array
 98	 */
 99	public $inner_content = array();
100
101	/**
102	 * Constructor.
103	 *
104	 * Populates object properties from the provided block instance argument.
105	 *
106	 * The given array of context values will not necessarily be available on
107	 * the instance itself, but is treated as the full set of values provided by
108	 * the block's ancestry. This is assigned to the private `available_context`
109	 * property. Only values which are configured to consumed by the block via
110	 * its registered type will be assigned to the block's `context` property.
111	 *
112	 * @since 5.5.0
113	 *
114	 * @param array                  $block             {
115	 *     An associative array of a single parsed block object. See WP_Block_Parser_Block.
116	 *
117	 *     @type string|null $blockName    Name of block.
118	 *     @type array       $attrs        Attributes from block comment delimiters.
119	 *     @type array       $innerBlocks  List of inner blocks. An array of arrays that
120	 *                                     have the same structure as this one.
121	 *     @type string      $innerHTML    HTML from inside block comment delimiters.
122	 *     @type array       $innerContent List of string fragments and null markers where inner blocks were found.
123	 * }
124	 * @param array                  $available_context Optional array of ancestry context values.
125	 * @param WP_Block_Type_Registry $registry          Optional block type registry.
126	 */
127	public function __construct( $block, $available_context = array(), $registry = null ) {
128		$this->parsed_block = $block;
129		$this->name         = $block['blockName'];
130
131		if ( is_null( $registry ) ) {
132			$registry = WP_Block_Type_Registry::get_instance();
133		}
134
135		$this->registry = $registry;
136
137		$this->block_type = $registry->get_registered( $this->name );
138
139		$this->available_context = $available_context;
140
141		$this->refresh_context_dependents();
142	}
143
144	/**
145	 * Updates the context for the current block and its inner blocks.
146	 *
147	 * The method updates the context of inner blocks, if any, by passing down
148	 * any context values the block provides (`provides_context`).
149	 *
150	 * If the block has inner blocks, the method recursively processes them by creating new instances of `WP_Block`
151	 * for each inner block and updating their context based on the block's `provides_context` property.
152	 *
153	 * @since 6.8.0
154	 */
155	public function refresh_context_dependents() {
156		/*
157		 * Merging the `$context` property here is not ideal, but for now needs to happen because of backward compatibility.
158		 * Ideally, the `$context` property itself would not be filterable directly and only the `$available_context` would be filterable.
159		 * However, this needs to be separately explored whether it's possible without breakage.
160		 */
161		$this->available_context = array_merge( $this->available_context, $this->context );
162
163		if ( ! empty( $this->block_type->uses_context ) ) {
164			foreach ( $this->block_type->uses_context as $context_name ) {
165				if ( array_key_exists( $context_name, $this->available_context ) ) {
166					$this->context[ $context_name ] = $this->available_context[ $context_name ];
167				}
168			}
169		}
170
171		$this->refresh_parsed_block_dependents();
172	}
173
174	/**
175	 * Updates the parsed block content for the current block and its inner blocks.
176	 *
177	 * This method sets the `inner_html` and `inner_content` properties of the block based on the parsed
178	 * block content provided during initialization. It ensures that the block instance reflects the
179	 * most up-to-date content for both the inner HTML and any string fragments around inner blocks.
180	 *
181	 * If the block has inner blocks, this method initializes a new `WP_Block_List` for them, ensuring the
182	 * correct content and context are updated for each nested block.
183	 *
184	 * @since 6.8.0
185	 */
186	public function refresh_parsed_block_dependents() {
187		if ( ! empty( $this->parsed_block['innerBlocks'] ) ) {
188			$child_context = $this->available_context;
189
190			if ( ! empty( $this->block_type->provides_context ) ) {
191				foreach ( $this->block_type->provides_context as $context_name => $attribute_name ) {
192					if ( array_key_exists( $attribute_name, $this->attributes ) ) {
193						$child_context[ $context_name ] = $this->attributes[ $attribute_name ];
194					}
195				}
196			}
197
198			$this->inner_blocks = new WP_Block_List( $this->parsed_block['innerBlocks'], $child_context, $this->registry );
199		}
200
201		if ( ! empty( $this->parsed_block['innerHTML'] ) ) {
202			$this->inner_html = $this->parsed_block['innerHTML'];
203		}
204
205		if ( ! empty( $this->parsed_block['innerContent'] ) ) {
206			$this->inner_content = $this->parsed_block['innerContent'];
207		}
208	}
209
210	/**
211	 * Returns a value from an inaccessible property.
212	 *
213	 * This is used to lazily initialize the `attributes` property of a block,
214	 * such that it is only prepared with default attributes at the time that
215	 * the property is accessed. For all other inaccessible properties, a `null`
216	 * value is returned.
217	 *
218	 * @since 5.5.0
219	 *
220	 * @param string $name Property name.
221	 * @return array|null Prepared attributes, or null.
222	 */
223	public function __get( $name ) {
224		if ( 'attributes' === $name ) {
225			$this->attributes = isset( $this->parsed_block['attrs'] ) ?
226				$this->parsed_block['attrs'] :
227				array();
228
229			if ( ! is_null( $this->block_type ) ) {
230				$this->attributes = $this->block_type->prepare_attributes_for_render( $this->attributes );
231			}
232
233			return $this->attributes;
234		}
235
236		return null;
237	}
238
239	/**
240	 * Processes the block bindings and updates the block attributes with the values from the sources.
241	 *
242	 * A block might contain bindings in its attributes. Bindings are mappings
243	 * between an attribute of the block and a source. A "source" is a function
244	 * registered with `register_block_bindings_source()` that defines how to
245	 * retrieve a value from outside the block, e.g. from post meta.
246	 *
247	 * This function will process those bindings and update the block's attributes
248	 * with the values coming from the bindings.
249	 *
250	 * ### Example
251	 *
252	 * The "bindings" property for an Image block might look like this:
253	 *
254	 * ```json
255	 * {
256	 *   "metadata": {
257	 *     "bindings": {
258	 *       "title": {
259	 *         "source": "core/post-meta",
260	 *         "args": { "key": "text_custom_field" }
261	 *       },
262	 *       "url": {
263	 *         "source": "core/post-meta",
264	 *         "args": { "key": "url_custom_field" }
265	 *       }
266	 *     }
267	 *   }
268	 * }
269	 * ```
270	 *
271	 * The above example will replace the `title` and `url` attributes of the Image
272	 * block with the values of the `text_custom_field` and `url_custom_field` post meta.
273	 *
274	 * @since 6.5.0
275	 * @since 6.6.0 Handle the `__default` attribute for pattern overrides.
276	 * @since 6.7.0 Return any updated bindings metadata in the computed attributes.
277	 *
278	 * @return array The computed block attributes for the provided block bindings.
279	 */
280	private function process_block_bindings() {
281		$block_type                 = $this->name;
282		$parsed_block               = $this->parsed_block;
283		$computed_attributes        = array();
284		$supported_block_attributes = get_block_bindings_supported_attributes( $block_type );
285
286		// If the block doesn't have the bindings property, isn't one of the supported
287		// block types, or the bindings property is not an array, return the block content.
288		if (
289			empty( $supported_block_attributes ) ||
290			empty( $parsed_block['attrs']['metadata']['bindings'] ) ||
291			! is_array( $parsed_block['attrs']['metadata']['bindings'] )
292		) {
293			return $computed_attributes;
294		}
295
296		$bindings = $parsed_block['attrs']['metadata']['bindings'];
297
298		/*
299		 * If the default binding is set for pattern overrides, replace it
300		 * with a pattern override binding for all supported attributes.
301		 */
302		if (
303			isset( $bindings['__default']['source'] ) &&
304			'core/pattern-overrides' === $bindings['__default']['source']
305		) {
306			$updated_bindings = array();
307
308			/*
309			 * Build a binding array of all supported attributes.
310			 * Note that this also omits the `__default` attribute from the
311			 * resulting array.
312			 */
313			foreach ( $supported_block_attributes as $attribute_name ) {
314				// Retain any non-pattern override bindings that might be present.
315				$updated_bindings[ $attribute_name ] = isset( $bindings[ $attribute_name ] )
316					? $bindings[ $attribute_name ]
317					: array( 'source' => 'core/pattern-overrides' );
318			}
319			$bindings = $updated_bindings;
320			/*
321			 * Update the bindings metadata of the computed attributes.
322			 * This ensures the block receives the expanded __default binding metadata when it renders.
323			 */
324			$computed_attributes['metadata'] = array_merge(
325				$parsed_block['attrs']['metadata'],
326				array( 'bindings' => $bindings )
327			);
328		}
329
330		foreach ( $bindings as $attribute_name => $block_binding ) {
331			// If the attribute is not in the supported list, process next attribute.
332			if ( ! in_array( $attribute_name, $supported_block_attributes, true ) ) {
333				continue;
334			}
335			// If no source is provided, or that source is not registered, process next attribute.
336			if ( ! isset( $block_binding['source'] ) || ! is_string( $block_binding['source'] ) ) {
337				continue;
338			}
339
340			$block_binding_source = get_block_bindings_source( $block_binding['source'] );
341			if ( null === $block_binding_source ) {
342				continue;
343			}
344
345			// Adds the necessary context defined by the source.
346			if ( ! empty( $block_binding_source->uses_context ) ) {
347				foreach ( $block_binding_source->uses_context as $context_name ) {
348					if ( array_key_exists( $context_name, $this->available_context ) ) {
349						$this->context[ $context_name ] = $this->available_context[ $context_name ];
350					}
351				}
352			}
353
354			$source_args  = ! empty( $block_binding['args'] ) && is_array( $block_binding['args'] ) ? $block_binding['args'] : array();
355			$source_value = $block_binding_source->get_value( $source_args, $this, $attribute_name );
356
357			// If the value is not null, process the HTML based on the block and the attribute.
358			if ( ! is_null( $source_value ) ) {
359				$computed_attributes[ $attribute_name ] = $source_value;
360			}
361		}
362
363		return $computed_attributes;
364	}
365
366	/**
367	 * Depending on the block attribute name, replace its value in the HTML based on the value provided.
368	 *
369	 * @since 6.5.0
370	 *
371	 * @param string $block_content  Block content.
372	 * @param string $attribute_name The attribute name to replace.
373	 * @param mixed  $source_value   The value used to replace in the HTML.
374	 * @return string The modified block content.
375	 */
376	private function replace_html( string $block_content, string $attribute_name, $source_value ) {
377		$block_type = $this->block_type;
378		if ( ! isset( $block_type->attributes[ $attribute_name ]['source'] ) ) {
379			return $block_content;
380		}
381
382		// Depending on the attribute source, the processing will be different.
383		switch ( $block_type->attributes[ $attribute_name ]['source'] ) {
384			case 'html':
385			case 'rich-text':
386				$block_reader = self::get_block_bindings_processor( $block_content );
387
388				// TODO: Support for CSS selectors whenever they are ready in the HTML API.
389				// In the meantime, support comma-separated selectors by exploding them into an array.
390				$selectors = explode( ',', $block_type->attributes[ $attribute_name ]['selector'] );
391				// Add a bookmark to the first tag to be able to iterate over the selectors.
392				$block_reader->next_tag();
393				$block_reader->set_bookmark( 'iterate-selectors' );
394
395				foreach ( $selectors as $selector ) {
396					// If the parent tag, or any of its children, matches the selector, replace the HTML.
397					if ( strcasecmp( $block_reader->get_tag(), $selector ) === 0 || $block_reader->next_tag(
398						array(
399							'tag_name' => $selector,
400						)
401					) ) {
402						// TODO: Use `WP_HTML_Processor::set_inner_html` method once it's available.
403						$block_reader->release_bookmark( 'iterate-selectors' );
404						$block_reader->replace_rich_text( wp_kses_post( $source_value ) );
405						return $block_reader->get_updated_html();
406					} else {
407						$block_reader->seek( 'iterate-selectors' );
408					}
409				}
410				$block_reader->release_bookmark( 'iterate-selectors' );
411				return $block_content;
412
413			case 'attribute':
414				$amended_content = new WP_HTML_Tag_Processor( $block_content );
415				if ( ! $amended_content->next_tag(
416					array(
417						// TODO: build the query from CSS selector.
418						'tag_name' => $block_type->attributes[ $attribute_name ]['selector'],
419					)
420				) ) {
421					return $block_content;
422				}
423				$amended_content->set_attribute( $block_type->attributes[ $attribute_name ]['attribute'], $source_value );
424				return $amended_content->get_updated_html();
425
426			default:
427				return $block_content;
428		}
429	}
430
431	private static function get_block_bindings_processor( string $block_content ) {
432		$internal_processor_class = new class('', WP_HTML_Processor::CONSTRUCTOR_UNLOCK_CODE) extends WP_HTML_Processor {
433			/**
434			 * Replace the rich text content between a tag opener and matching closer.
435			 *
436			 * When stopped on a tag opener, replace the content enclosed by it and its
437			 * matching closer with the provided rich text.
438			 *
439			 * @param string $rich_text The rich text to replace the original content with.
440			 * @return bool True on success.
441			 */
442			public function replace_rich_text( $rich_text ) {
443				if ( $this->is_tag_closer() || ! $this->expects_closer() ) {
444					return false;
445				}
446
447				$depth    = $this->get_current_depth();
448				$tag_name = $this->get_tag();
449
450				$this->set_bookmark( '_wp_block_bindings' );
451				// The bookmark names are prefixed with `_` so the key below has an extra `_`.
452				$tag_opener = $this->bookmarks['__wp_block_bindings'];
453				$start      = $tag_opener->start + $tag_opener->length;
454
455				// Find matching tag closer.
456				while ( $this->next_token() && $this->get_current_depth() >= $depth ) {
457				}
458
459				if ( ! $this->is_tag_closer() || $tag_name !== $this->get_tag() ) {
460					return false;
461				}
462
463				$this->set_bookmark( '_wp_block_bindings' );
464				$tag_closer = $this->bookmarks['__wp_block_bindings'];
465				$end        = $tag_closer->start;
466
467				$this->lexical_updates[] = new WP_HTML_Text_Replacement(
468					$start,
469					$end - $start,
470					$rich_text
471				);
472
473				return true;
474			}
475		};
476
477		return $internal_processor_class::create_fragment( $block_content );
478	}
479
480	/**
481	 * Generates the render output for the block.
482	 *
483	 * @since 5.5.0
484	 * @since 6.5.0 Added block bindings processing.
485	 *
486	 * @global WP_Post $post Global post object.
487	 *
488	 * @param array $options {
489	 *     Optional options object.
490	 *
491	 *     @type bool $dynamic Defaults to 'true'. Optionally set to false to avoid using the block's render_callback.
492	 * }
493	 * @return string Rendered block output.
494	 */
495	public function render( $options = array() ) {
496		global $post;
497
498		$before_wp_enqueue_scripts_count = did_action( 'wp_enqueue_scripts' );
499
500		// Capture the current assets queues.
501		$before_styles_queue         = wp_styles()->queue;
502		$before_scripts_queue        = wp_scripts()->queue;
503		$before_script_modules_queue = wp_script_modules()->get_queue();
504
505		/*
506		 * There can be only one root interactive block at a time because the rendered HTML of that block contains
507		 * the rendered HTML of all its inner blocks, including any interactive block.
508		 */
509		static $root_interactive_block = null;
510		/**
511		 * Filters whether Interactivity API should process directives.
512		 *
513		 * @since 6.6.0
514		 *
515		 * @param bool $enabled Whether the directives processing is enabled.
516		 */
517		$interactivity_process_directives_enabled = apply_filters( 'interactivity_process_directives', true );
518		if (
519			$interactivity_process_directives_enabled && null === $root_interactive_block && (
520				( isset( $this->block_type->supports['interactivity'] ) && true === $this->block_type->supports['interactivity'] ) ||
521				! empty( $this->block_type->supports['interactivity']['interactive'] )
522			)
523		) {
524			$root_interactive_block = $this;
525		}
526
527		$options = wp_parse_args(
528			$options,
529			array(
530				'dynamic' => true,
531			)
532		);
533
534		// Process the block bindings and get attributes updated with the values from the sources.
535		$computed_attributes = $this->process_block_bindings();
536		if ( ! empty( $computed_attributes ) ) {
537			// Merge the computed attributes with the original attributes.
538			$this->attributes = array_merge( $this->attributes, $computed_attributes );
539		}
540
541		$is_dynamic    = $options['dynamic'] && $this->name && null !== $this->block_type && $this->block_type->is_dynamic();
542		$block_content = '';
543
544		if ( ! $options['dynamic'] || empty( $this->block_type->skip_inner_blocks ) ) {
545			$index = 0;
546
547			foreach ( $this->inner_content as $chunk ) {
548				if ( is_string( $chunk ) ) {
549					$block_content .= $chunk;
550				} else {
551					$inner_block  = $this->inner_blocks[ $index ];
552					$parent_block = $this;
553
554					/** This filter is documented in wp-includes/blocks.php */
555					$pre_render = apply_filters( 'pre_render_block', null, $inner_block->parsed_block, $parent_block );
556
557					if ( ! is_null( $pre_render ) ) {
558						$block_content .= $pre_render;
559					} else {
560						$source_block        = $inner_block->parsed_block;
561						$inner_block_context = $inner_block->context;
562
563						/** This filter is documented in wp-includes/blocks.php */
564						$inner_block->parsed_block = apply_filters( 'render_block_data', $inner_block->parsed_block, $source_block, $parent_block );
565
566						/** This filter is documented in wp-includes/blocks.php */
567						$inner_block->context = apply_filters( 'render_block_context', $inner_block->context, $inner_block->parsed_block, $parent_block );
568
569						/*
570						 * The `refresh_context_dependents()` method already calls `refresh_parsed_block_dependents()`.
571						 * Therefore the second condition is irrelevant if the first one is satisfied.
572						 */
573						if ( $inner_block->context !== $inner_block_context ) {
574							$inner_block->refresh_context_dependents();
575						} elseif ( $inner_block->parsed_block !== $source_block ) {
576							$inner_block->refresh_parsed_block_dependents();
577						}
578
579						$block_content .= $inner_block->render();
580					}
581
582					++$index;
583				}
584			}
585		}
586
587		if ( ! empty( $computed_attributes ) && ! empty( $block_content ) ) {
588			foreach ( $computed_attributes as $attribute_name => $source_value ) {
589				$block_content = $this->replace_html( $block_content, $attribute_name, $source_value );
590			}
591		}
592
593		if ( $is_dynamic ) {
594			$global_post = $post;
595			$parent      = WP_Block_Supports::$block_to_render;
596
597			WP_Block_Supports::$block_to_render = $this->parsed_block;
598
599			$block_content = (string) call_user_func( $this->block_type->render_callback, $this->attributes, $block_content, $this );
600
601			WP_Block_Supports::$block_to_render = $parent;
602
603			$post = $global_post;
604		}
605
606		if ( ( ! empty( $this->block_type->script_handles ) ) ) {
607			foreach ( $this->block_type->script_handles as $script_handle ) {
608				wp_enqueue_script( $script_handle );
609			}
610		}
611
612		if ( ! empty( $this->block_type->view_script_handles ) ) {
613			foreach ( $this->block_type->view_script_handles as $view_script_handle ) {
614				wp_enqueue_script( $view_script_handle );
615			}
616		}
617
618		if ( ! empty( $this->block_type->view_script_module_ids ) ) {
619			foreach ( $this->block_type->view_script_module_ids as $view_script_module_id ) {
620				wp_enqueue_script_module( $view_script_module_id );
621			}
622		}
623
624		/*
625		 * For Core blocks, these styles are only enqueued if `wp_should_load_separate_core_block_assets()` returns
626		 * true. Otherwise these `wp_enqueue_style()` calls will not have any effect, as the Core blocks are relying on
627		 * the combined 'wp-block-library' stylesheet instead, which is unconditionally enqueued.
628		 */
629		if ( ( ! empty( $this->block_type->style_handles ) ) ) {
630			foreach ( $this->block_type->style_handles as $style_handle ) {
631				wp_enqueue_style( $style_handle );
632			}
633		}
634
635		if ( ( ! empty( $this->block_type->view_style_handles ) ) ) {
636			foreach ( $this->block_type->view_style_handles as $view_style_handle ) {
637				wp_enqueue_style( $view_style_handle );
638			}
639		}
640
641		/**
642		 * Filters the content of a single block.
643		 *
644		 * @since 5.0.0
645		 * @since 5.9.0 The `$instance` parameter was added.
646		 *
647		 * @param string   $block_content The block content.
648		 * @param array    $block         The full block, including name and attributes.
649		 * @param WP_Block $instance      The block instance.
650		 */
651		$block_content = apply_filters( 'render_block', $block_content, $this->parsed_block, $this );
652
653		/**
654		 * Filters the content of a single block.
655		 *
656		 * The dynamic portion of the hook name, `$name`, refers to
657		 * the block name, e.g. "core/paragraph".
658		 *
659		 * @since 5.7.0
660		 * @since 5.9.0 The `$instance` parameter was added.
661		 *
662		 * @param string   $block_content The block content.
663		 * @param array    $block         The full block, including name and attributes.
664		 * @param WP_Block $instance      The block instance.
665		 */
666		$block_content = apply_filters( "render_block_{$this->name}", $block_content, $this->parsed_block, $this );
667
668		if ( $root_interactive_block === $this ) {
669			// The root interactive block has finished rendering. Time to process directives.
670			$block_content          = wp_interactivity_process_directives( $block_content );
671			$root_interactive_block = null;
672		}
673
674		// Capture the new assets enqueued during rendering, and restore the queues the state prior to rendering.
675		$after_styles_queue         = wp_styles()->queue;
676		$after_scripts_queue        = wp_scripts()->queue;
677		$after_script_modules_queue = wp_script_modules()->get_queue();
678
679		/*
680		 * As a very special case, a dynamic block may in fact include a call to wp_head() (and thus wp_enqueue_scripts()),
681		 * in which all of its enqueued assets are targeting wp_footer. In this case, nothing would be printed, but this
682		 * shouldn't indicate that the just-enqueued assets should be dequeued due to it being an empty block.
683		 */
684		$just_did_wp_enqueue_scripts = ( did_action( 'wp_enqueue_scripts' ) !== $before_wp_enqueue_scripts_count );
685
686		$has_new_styles         = ( $before_styles_queue !== $after_styles_queue );
687		$has_new_scripts        = ( $before_scripts_queue !== $after_scripts_queue );
688		$has_new_script_modules = ( $before_script_modules_queue !== $after_script_modules_queue );
689
690		// Dequeue the newly enqueued assets with the existing assets if the rendered block was empty & wp_enqueue_scripts did not fire.
691		if (
692			! $just_did_wp_enqueue_scripts &&
693			( $has_new_styles || $has_new_scripts || $has_new_script_modules ) &&
694			(
695				trim( $block_content ) === '' &&
696				/**
697				 * Filters whether to enqueue assets for a block which has no rendered content.
698				 *
699				 * @since 6.9.0
700				 *
701				 * @param bool   $enqueue    Whether to enqueue assets.
702				 * @param string $block_name Block name.
703				 */
704				! (bool) apply_filters( 'enqueue_empty_block_content_assets', false, $this->name )
705			)
706		) {
707			foreach ( array_diff( $after_styles_queue, $before_styles_queue ) as $handle ) {
708				wp_dequeue_style( $handle );
709			}
710			foreach ( array_diff( $after_scripts_queue, $before_scripts_queue ) as $handle ) {
711				wp_dequeue_script( $handle );
712			}
713			foreach ( array_diff( $after_script_modules_queue, $before_script_modules_queue ) as $handle ) {
714				wp_dequeue_script_module( $handle );
715			}
716		}
717
718		return $block_content;
719	}
720}
721