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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] 16 class 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 * List of supported block attributes for block bindings. 103 * 104 * @since 6.9.0 105 * @var array 106 * 107 * @see WP_Block::process_block_bindings() 108 */ 109 private const BLOCK_BINDINGS_SUPPORTED_ATTRIBUTES = array( 110 'core/paragraph' => array( 'content' ), 111 'core/heading' => array( 'content' ), 112 'core/image' => array( 'id', 'url', 'title', 'alt' ), 113 'core/button' => array( 'url', 'text', 'linkTarget', 'rel' ), 114 'core/post-date' => array( 'datetime' ), 115 ); 116 117 /** 118 * Constructor. 119 * 120 * Populates object properties from the provided block instance argument. 121 * 122 * The given array of context values will not necessarily be available on 123 * the instance itself, but is treated as the full set of values provided by 124 * the block's ancestry. This is assigned to the private `available_context` 125 * property. Only values which are configured to consumed by the block via 126 * its registered type will be assigned to the block's `context` property. 127 * 128 * @since 5.5.0 129 * 130 * @param array $block { 131 * An associative array of a single parsed block object. See WP_Block_Parser_Block. 132 * 133 * @type string|null $blockName Name of block. 134 * @type array $attrs Attributes from block comment delimiters. 135 * @type array $innerBlocks List of inner blocks. An array of arrays that 136 * have the same structure as this one. 137 * @type string $innerHTML HTML from inside block comment delimiters. 138 * @type array $innerContent List of string fragments and null markers where inner blocks were found. 139 * } 140 * @param array $available_context Optional array of ancestry context values. 141 * @param WP_Block_Type_Registry $registry Optional block type registry. 142 */ 143 public function __construct( $block, $available_context = array(), $registry = null ) { 144 $this->parsed_block = $block; 145 $this->name = $block['blockName']; 146 147 if ( is_null( $registry ) ) { 148 $registry = WP_Block_Type_Registry::get_instance(); 149 } 150 151 $this->registry = $registry; 152 153 $this->block_type = $registry->get_registered( $this->name ); 154 155 $this->available_context = $available_context; 156 157 $this->refresh_context_dependents(); 158 } 159 160 /** 161 * Updates the context for the current block and its inner blocks. 162 * 163 * The method updates the context of inner blocks, if any, by passing down 164 * any context values the block provides (`provides_context`). 165 * 166 * If the block has inner blocks, the method recursively processes them by creating new instances of `WP_Block` 167 * for each inner block and updating their context based on the block's `provides_context` property. 168 * 169 * @since 6.8.0 170 */ 171 public function refresh_context_dependents() { 172 /* 173 * Merging the `$context` property here is not ideal, but for now needs to happen because of backward compatibility. 174 * Ideally, the `$context` property itself would not be filterable directly and only the `$available_context` would be filterable. 175 * However, this needs to be separately explored whether it's possible without breakage. 176 */ 177 $this->available_context = array_merge( $this->available_context, $this->context ); 178 179 if ( ! empty( $this->block_type->uses_context ) ) { 180 foreach ( $this->block_type->uses_context as $context_name ) { 181 if ( array_key_exists( $context_name, $this->available_context ) ) { 182 $this->context[ $context_name ] = $this->available_context[ $context_name ]; 183 } 184 } 185 } 186 187 $this->refresh_parsed_block_dependents(); 188 } 189 190 /** 191 * Updates the parsed block content for the current block and its inner blocks. 192 * 193 * This method sets the `inner_html` and `inner_content` properties of the block based on the parsed 194 * block content provided during initialization. It ensures that the block instance reflects the 195 * most up-to-date content for both the inner HTML and any string fragments around inner blocks. 196 * 197 * If the block has inner blocks, this method initializes a new `WP_Block_List` for them, ensuring the 198 * correct content and context are updated for each nested block. 199 * 200 * @since 6.8.0 201 */ 202 public function refresh_parsed_block_dependents() { 203 if ( ! empty( $this->parsed_block['innerBlocks'] ) ) { 204 $child_context = $this->available_context; 205 206 if ( ! empty( $this->block_type->provides_context ) ) { 207 foreach ( $this->block_type->provides_context as $context_name => $attribute_name ) { 208 if ( array_key_exists( $attribute_name, $this->attributes ) ) { 209 $child_context[ $context_name ] = $this->attributes[ $attribute_name ]; 210 } 211 } 212 } 213 214 $this->inner_blocks = new WP_Block_List( $this->parsed_block['innerBlocks'], $child_context, $this->registry ); 215 } 216 217 if ( ! empty( $this->parsed_block['innerHTML'] ) ) { 218 $this->inner_html = $this->parsed_block['innerHTML']; 219 } 220 221 if ( ! empty( $this->parsed_block['innerContent'] ) ) { 222 $this->inner_content = $this->parsed_block['innerContent']; 223 } 224 } 225 226 /** 227 * Returns a value from an inaccessible property. 228 * 229 * This is used to lazily initialize the `attributes` property of a block, 230 * such that it is only prepared with default attributes at the time that 231 * the property is accessed. For all other inaccessible properties, a `null` 232 * value is returned. 233 * 234 * @since 5.5.0 235 * 236 * @param string $name Property name. 237 * @return array|null Prepared attributes, or null. 238 */ 239 public function __get( $name ) { 240 if ( 'attributes' === $name ) { 241 $this->attributes = isset( $this->parsed_block['attrs'] ) ? 242 $this->parsed_block['attrs'] : 243 array(); 244 245 if ( ! is_null( $this->block_type ) ) { 246 $this->attributes = $this->block_type->prepare_attributes_for_render( $this->attributes ); 247 } 248 249 return $this->attributes; 250 } 251 252 return null; 253 } 254 255 /** 256 * Processes the block bindings and updates the block attributes with the values from the sources. 257 * 258 * A block might contain bindings in its attributes. Bindings are mappings 259 * between an attribute of the block and a source. A "source" is a function 260 * registered with `register_block_bindings_source()` that defines how to 261 * retrieve a value from outside the block, e.g. from post meta. 262 * 263 * This function will process those bindings and update the block's attributes 264 * with the values coming from the bindings. 265 * 266 * ### Example 267 * 268 * The "bindings" property for an Image block might look like this: 269 * 270 * ```json 271 * { 272 * "metadata": { 273 * "bindings": { 274 * "title": { 275 * "source": "core/post-meta", 276 * "args": { "key": "text_custom_field" } 277 * }, 278 * "url": { 279 * "source": "core/post-meta", 280 * "args": { "key": "url_custom_field" } 281 * } 282 * } 283 * } 284 * } 285 * ``` 286 * 287 * The above example will replace the `title` and `url` attributes of the Image 288 * block with the values of the `text_custom_field` and `url_custom_field` post meta. 289 * 290 * @since 6.5.0 291 * @since 6.6.0 Handle the `__default` attribute for pattern overrides. 292 * @since 6.7.0 Return any updated bindings metadata in the computed attributes. 293 * 294 * @return array The computed block attributes for the provided block bindings. 295 */ 296 private function process_block_bindings() { 297 $block_type = $this->name; 298 $parsed_block = $this->parsed_block; 299 $computed_attributes = array(); 300 301 $supported_block_attributes = 302 self::BLOCK_BINDINGS_SUPPORTED_ATTRIBUTES[ $block_type ] ?? 303 array(); 304 305 /** 306 * Filters the supported block attributes for block bindings. 307 * 308 * The dynamic portion of the hook name, `$block_type`, refers to the block type 309 * whose attributes are being filtered. 310 * 311 * @since 6.9.0 312 * 313 * @param string[] $supported_block_attributes The block's attributes that are supported by block bindings. 314 */ 315 $supported_block_attributes = apply_filters( 316 "block_bindings_supported_attributes_{$block_type}", 317 $supported_block_attributes 318 ); 319 320 // If the block doesn't have the bindings property, isn't one of the supported 321 // block types, or the bindings property is not an array, return the block content. 322 if ( 323 empty( $supported_block_attributes ) || 324 empty( $parsed_block['attrs']['metadata']['bindings'] ) || 325 ! is_array( $parsed_block['attrs']['metadata']['bindings'] ) 326 ) { 327 return $computed_attributes; 328 } 329 330 $bindings = $parsed_block['attrs']['metadata']['bindings']; 331 332 /* 333 * If the default binding is set for pattern overrides, replace it 334 * with a pattern override binding for all supported attributes. 335 */ 336 if ( 337 isset( $bindings['__default']['source'] ) && 338 'core/pattern-overrides' === $bindings['__default']['source'] 339 ) { 340 $updated_bindings = array(); 341 342 /* 343 * Build a binding array of all supported attributes. 344 * Note that this also omits the `__default` attribute from the 345 * resulting array. 346 */ 347 foreach ( $supported_block_attributes as $attribute_name ) { 348 // Retain any non-pattern override bindings that might be present. 349 $updated_bindings[ $attribute_name ] = isset( $bindings[ $attribute_name ] ) 350 ? $bindings[ $attribute_name ] 351 : array( 'source' => 'core/pattern-overrides' ); 352 } 353 $bindings = $updated_bindings; 354 /* 355 * Update the bindings metadata of the computed attributes. 356 * This ensures the block receives the expanded __default binding metadata when it renders. 357 */ 358 $computed_attributes['metadata'] = array_merge( 359 $parsed_block['attrs']['metadata'], 360 array( 'bindings' => $bindings ) 361 ); 362 } 363 364 foreach ( $bindings as $attribute_name => $block_binding ) { 365 // If the attribute is not in the supported list, process next attribute. 366 if ( ! in_array( $attribute_name, $supported_block_attributes, true ) ) { 367 continue; 368 } 369 // If no source is provided, or that source is not registered, process next attribute. 370 if ( ! isset( $block_binding['source'] ) || ! is_string( $block_binding['source'] ) ) { 371 continue; 372 } 373 374 $block_binding_source = get_block_bindings_source( $block_binding['source'] ); 375 if ( null === $block_binding_source ) { 376 continue; 377 } 378 379 // Adds the necessary context defined by the source. 380 if ( ! empty( $block_binding_source->uses_context ) ) { 381 foreach ( $block_binding_source->uses_context as $context_name ) { 382 if ( array_key_exists( $context_name, $this->available_context ) ) { 383 $this->context[ $context_name ] = $this->available_context[ $context_name ]; 384 } 385 } 386 } 387 388 $source_args = ! empty( $block_binding['args'] ) && is_array( $block_binding['args'] ) ? $block_binding['args'] : array(); 389 $source_value = $block_binding_source->get_value( $source_args, $this, $attribute_name ); 390 391 // If the value is not null, process the HTML based on the block and the attribute. 392 if ( ! is_null( $source_value ) ) { 393 $computed_attributes[ $attribute_name ] = $source_value; 394 } 395 } 396 397 return $computed_attributes; 398 } 399 400 /** 401 * Depending on the block attribute name, replace its value in the HTML based on the value provided. 402 * 403 * @since 6.5.0 404 * 405 * @param string $block_content Block content. 406 * @param string $attribute_name The attribute name to replace. 407 * @param mixed $source_value The value used to replace in the HTML. 408 * @return string The modified block content. 409 */ 410 private function replace_html( string $block_content, string $attribute_name, $source_value ) { 411 $block_type = $this->block_type; 412 if ( ! isset( $block_type->attributes[ $attribute_name ]['source'] ) ) { 413 return $block_content; 414 } 415 416 // Depending on the attribute source, the processing will be different. 417 switch ( $block_type->attributes[ $attribute_name ]['source'] ) { 418 case 'html': 419 case 'rich-text': 420 $block_reader = new WP_HTML_Tag_Processor( $block_content ); 421 422 // TODO: Support for CSS selectors whenever they are ready in the HTML API. 423 // In the meantime, support comma-separated selectors by exploding them into an array. 424 $selectors = explode( ',', $block_type->attributes[ $attribute_name ]['selector'] ); 425 // Add a bookmark to the first tag to be able to iterate over the selectors. 426 $block_reader->next_tag(); 427 $block_reader->set_bookmark( 'iterate-selectors' ); 428 429 // TODO: This shouldn't be needed when the `set_inner_html` function is ready. 430 // Store the parent tag and its attributes to be able to restore them later in the button. 431 // The button block has a wrapper while the paragraph and heading blocks don't. 432 if ( 'core/button' === $this->name ) { 433 $button_wrapper = $block_reader->get_tag(); 434 $button_wrapper_attribute_names = $block_reader->get_attribute_names_with_prefix( '' ); 435 $button_wrapper_attrs = array(); 436 foreach ( $button_wrapper_attribute_names as $name ) { 437 $button_wrapper_attrs[ $name ] = $block_reader->get_attribute( $name ); 438 } 439 } 440 441 foreach ( $selectors as $selector ) { 442 // If the parent tag, or any of its children, matches the selector, replace the HTML. 443 if ( strcasecmp( $block_reader->get_tag(), $selector ) === 0 || $block_reader->next_tag( 444 array( 445 'tag_name' => $selector, 446 ) 447 ) ) { 448 $block_reader->release_bookmark( 'iterate-selectors' ); 449 450 // TODO: Use `set_inner_html` method whenever it's ready in the HTML API. 451 // Until then, it is hardcoded for the paragraph, heading, and button blocks. 452 // Store the tag and its attributes to be able to restore them later. 453 $selector_attribute_names = $block_reader->get_attribute_names_with_prefix( '' ); 454 $selector_attrs = array(); 455 foreach ( $selector_attribute_names as $name ) { 456 $selector_attrs[ $name ] = $block_reader->get_attribute( $name ); 457 } 458 $selector_markup = "<$selector>" . wp_kses_post( $source_value ) . "</$selector>"; 459 $amended_content = new WP_HTML_Tag_Processor( $selector_markup ); 460 $amended_content->next_tag(); 461 foreach ( $selector_attrs as $attribute_key => $attribute_value ) { 462 $amended_content->set_attribute( $attribute_key, $attribute_value ); 463 } 464 if ( 'core/paragraph' === $this->name || 'core/heading' === $this->name ) { 465 return $amended_content->get_updated_html(); 466 } 467 if ( 'core/button' === $this->name ) { 468 $button_markup = "<$button_wrapper>{$amended_content->get_updated_html()}</$button_wrapper>"; 469 $amended_button = new WP_HTML_Tag_Processor( $button_markup ); 470 $amended_button->next_tag(); 471 foreach ( $button_wrapper_attrs as $attribute_key => $attribute_value ) { 472 $amended_button->set_attribute( $attribute_key, $attribute_value ); 473 } 474 return $amended_button->get_updated_html(); 475 } 476 } else { 477 $block_reader->seek( 'iterate-selectors' ); 478 } 479 } 480 $block_reader->release_bookmark( 'iterate-selectors' ); 481 return $block_content; 482 483 case 'attribute': 484 $amended_content = new WP_HTML_Tag_Processor( $block_content ); 485 if ( ! $amended_content->next_tag( 486 array( 487 // TODO: build the query from CSS selector. 488 'tag_name' => $block_type->attributes[ $attribute_name ]['selector'], 489 ) 490 ) ) { 491 return $block_content; 492 } 493 $amended_content->set_attribute( $block_type->attributes[ $attribute_name ]['attribute'], $source_value ); 494 return $amended_content->get_updated_html(); 495 496 default: 497 return $block_content; 498 } 499 } 500 501 502 /** 503 * Generates the render output for the block. 504 * 505 * @since 5.5.0 506 * @since 6.5.0 Added block bindings processing. 507 * 508 * @global WP_Post $post Global post object. 509 * 510 * @param array $options { 511 * Optional options object. 512 * 513 * @type bool $dynamic Defaults to 'true'. Optionally set to false to avoid using the block's render_callback. 514 * } 515 * @return string Rendered block output. 516 */ 517 public function render( $options = array() ) { 518 global $post; 519 520 /* 521 * There can be only one root interactive block at a time because the rendered HTML of that block contains 522 * the rendered HTML of all its inner blocks, including any interactive block. 523 */ 524 static $root_interactive_block = null; 525 /** 526 * Filters whether Interactivity API should process directives. 527 * 528 * @since 6.6.0 529 * 530 * @param bool $enabled Whether the directives processing is enabled. 531 */ 532 $interactivity_process_directives_enabled = apply_filters( 'interactivity_process_directives', true ); 533 if ( 534 $interactivity_process_directives_enabled && null === $root_interactive_block && ( 535 ( isset( $this->block_type->supports['interactivity'] ) && true === $this->block_type->supports['interactivity'] ) || 536 ! empty( $this->block_type->supports['interactivity']['interactive'] ) 537 ) 538 ) { 539 $root_interactive_block = $this; 540 } 541 542 $options = wp_parse_args( 543 $options, 544 array( 545 'dynamic' => true, 546 ) 547 ); 548 549 // Process the block bindings and get attributes updated with the values from the sources. 550 $computed_attributes = $this->process_block_bindings(); 551 if ( ! empty( $computed_attributes ) ) { 552 // Merge the computed attributes with the original attributes. 553 $this->attributes = array_merge( $this->attributes, $computed_attributes ); 554 } 555 556 $is_dynamic = $options['dynamic'] && $this->name && null !== $this->block_type && $this->block_type->is_dynamic(); 557 $block_content = ''; 558 559 if ( ! $options['dynamic'] || empty( $this->block_type->skip_inner_blocks ) ) { 560 $index = 0; 561 562 foreach ( $this->inner_content as $chunk ) { 563 if ( is_string( $chunk ) ) { 564 $block_content .= $chunk; 565 } else { 566 $inner_block = $this->inner_blocks[ $index ]; 567 $parent_block = $this; 568 569 /** This filter is documented in wp-includes/blocks.php */ 570 $pre_render = apply_filters( 'pre_render_block', null, $inner_block->parsed_block, $parent_block ); 571 572 if ( ! is_null( $pre_render ) ) { 573 $block_content .= $pre_render; 574 } else { 575 $source_block = $inner_block->parsed_block; 576 $inner_block_context = $inner_block->context; 577 578 /** This filter is documented in wp-includes/blocks.php */ 579 $inner_block->parsed_block = apply_filters( 'render_block_data', $inner_block->parsed_block, $source_block, $parent_block ); 580 581 /** This filter is documented in wp-includes/blocks.php */ 582 $inner_block->context = apply_filters( 'render_block_context', $inner_block->context, $inner_block->parsed_block, $parent_block ); 583 584 /* 585 * The `refresh_context_dependents()` method already calls `refresh_parsed_block_dependents()`. 586 * Therefore the second condition is irrelevant if the first one is satisfied. 587 */ 588 if ( $inner_block->context !== $inner_block_context ) { 589 $inner_block->refresh_context_dependents(); 590 } elseif ( $inner_block->parsed_block !== $source_block ) { 591 $inner_block->refresh_parsed_block_dependents(); 592 } 593 594 $block_content .= $inner_block->render(); 595 } 596 597 ++$index; 598 } 599 } 600 } 601 602 if ( ! empty( $computed_attributes ) && ! empty( $block_content ) ) { 603 foreach ( $computed_attributes as $attribute_name => $source_value ) { 604 $block_content = $this->replace_html( $block_content, $attribute_name, $source_value ); 605 } 606 } 607 608 if ( $is_dynamic ) { 609 $global_post = $post; 610 $parent = WP_Block_Supports::$block_to_render; 611 612 WP_Block_Supports::$block_to_render = $this->parsed_block; 613 614 $block_content = (string) call_user_func( $this->block_type->render_callback, $this->attributes, $block_content, $this ); 615 616 WP_Block_Supports::$block_to_render = $parent; 617 618 $post = $global_post; 619 } 620 621 if ( ( ! empty( $this->block_type->script_handles ) ) ) { 622 foreach ( $this->block_type->script_handles as $script_handle ) { 623 wp_enqueue_script( $script_handle ); 624 } 625 } 626 627 if ( ! empty( $this->block_type->view_script_handles ) ) { 628 foreach ( $this->block_type->view_script_handles as $view_script_handle ) { 629 wp_enqueue_script( $view_script_handle ); 630 } 631 } 632 633 if ( ! empty( $this->block_type->view_script_module_ids ) ) { 634 foreach ( $this->block_type->view_script_module_ids as $view_script_module_id ) { 635 wp_enqueue_script_module( $view_script_module_id ); 636 } 637 } 638 639 /* 640 * For Core blocks, these styles are only enqueued if `wp_should_load_separate_core_block_assets()` returns 641 * true. Otherwise these `wp_enqueue_style()` calls will not have any effect, as the Core blocks are relying on 642 * the combined 'wp-block-library' stylesheet instead, which is unconditionally enqueued. 643 */ 644 if ( ( ! empty( $this->block_type->style_handles ) ) ) { 645 foreach ( $this->block_type->style_handles as $style_handle ) { 646 wp_enqueue_style( $style_handle ); 647 } 648 } 649 650 if ( ( ! empty( $this->block_type->view_style_handles ) ) ) { 651 foreach ( $this->block_type->view_style_handles as $view_style_handle ) { 652 wp_enqueue_style( $view_style_handle ); 653 } 654 } 655 656 /** 657 * Filters the content of a single block. 658 * 659 * @since 5.0.0 660 * @since 5.9.0 The `$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', $block_content, $this->parsed_block, $this ); 667 668 /** 669 * Filters the content of a single block. 670 * 671 * The dynamic portion of the hook name, `$name`, refers to 672 * the block name, e.g. "core/paragraph". 673 * 674 * @since 5.7.0 675 * @since 5.9.0 The `$instance` parameter was added. 676 * 677 * @param string $block_content The block content. 678 * @param array $block The full block, including name and attributes. 679 * @param WP_Block $instance The block instance. 680 */ 681 $block_content = apply_filters( "render_block_{$this->name}", $block_content, $this->parsed_block, $this ); 682 683 if ( $root_interactive_block === $this ) { 684 // The root interactive block has finished rendering. Time to process directives. 685 $block_content = wp_interactivity_process_directives( $block_content ); 686 $root_interactive_block = null; 687 } 688 689 return $block_content; 690 } 691 }
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