<h2>Editing: class-wp-block.php</h2>
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/**
 * Blocks API: WP_Block class
 *
 * @package WordPress
 * @since 5.5.0
 */

/**
 * Class representing a parsed instance of a block.
 *
 * @since 5.5.0
 * @property array $attributes
 */
#[AllowDynamicProperties]
class WP_Block {

	/**
	 * Original parsed array representation of block.
	 *
	 * @since 5.5.0
	 * @var array
	 */
	public $parsed_block;

	/**
	 * Name of block.
	 *
	 * @example &quot;core/paragraph&quot;
	 *
	 * @since 5.5.0
	 * @var string
	 */
	public $name;

	/**
	 * Block type associated with the instance.
	 *
	 * @since 5.5.0
	 * @var WP_Block_Type
	 */
	public $block_type;

	/**
	 * Block context values.
	 *
	 * @since 5.5.0
	 * @var array
	 */
	public $context = array();

	/**
	 * All available context of the current hierarchy.
	 *
	 * @since 5.5.0
	 * @var array
	 * @access protected
	 */
	protected $available_context;

	/**
	 * Block type registry.
	 *
	 * @since 5.9.0
	 * @var WP_Block_Type_Registry
	 * @access protected
	 */
	protected $registry;

	/**
	 * List of inner blocks (of this same class)
	 *
	 * @since 5.5.0
	 * @var WP_Block_List
	 */
	public $inner_blocks = array();

	/**
	 * Resultant HTML from inside block comment delimiters after removing inner
	 * blocks.
	 *
	 * @example &quot;...Just &lt;!-- wp:test /--&gt; testing...&quot; -&gt; &quot;Just testing...&quot;
	 *
	 * @since 5.5.0
	 * @var string
	 */
	public $inner_html = '';

	/**
	 * List of string fragments and null markers where inner blocks were found
	 *
	 * @example array(
	 *   'inner_html'    =&gt; 'BeforeInnerAfter',
	 *   'inner_blocks'  =&gt; array( block, block ),
	 *   'inner_content' =&gt; array( 'Before', null, 'Inner', null, 'After' ),
	 * )
	 *
	 * @since 5.5.0
	 * @var array
	 */
	public $inner_content = array();

	/**
	 * Constructor.
	 *
	 * Populates object properties from the provided block instance argument.
	 *
	 * The given array of context values will not necessarily be available on
	 * the instance itself, but is treated as the full set of values provided by
	 * the block's ancestry. This is assigned to the private `available_context`
	 * property. Only values which are configured to consumed by the block via
	 * its registered type will be assigned to the block's `context` property.
	 *
	 * @since 5.5.0
	 *
	 * @param array                  $block             {
	 *     A representative array of a single parsed block object. See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array    $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where inner blocks were found.
	 * }
	 * @param array                  $available_context Optional array of ancestry context values.
	 * @param WP_Block_Type_Registry $registry          Optional block type registry.
	 */
	public function __construct( $block, $available_context = array(), $registry = null ) {
		$this-&gt;parsed_block = $block;
		$this-&gt;name         = $block['blockName'];

		if ( is_null( $registry ) ) {
			$registry = WP_Block_Type_Registry::get_instance();
		}

		$this-&gt;registry = $registry;

		$this-&gt;block_type = $registry-&gt;get_registered( $this-&gt;name );

		$this-&gt;available_context = $available_context;

		if ( ! empty( $this-&gt;block_type-&gt;uses_context ) ) {
			foreach ( $this-&gt;block_type-&gt;uses_context as $context_name ) {
				if ( array_key_exists( $context_name, $this-&gt;available_context ) ) {
					$this-&gt;context[ $context_name ] = $this-&gt;available_context[ $context_name ];
				}
			}
		}

		if ( ! empty( $block['innerBlocks'] ) ) {
			$child_context = $this-&gt;available_context;

			if ( ! empty( $this-&gt;block_type-&gt;provides_context ) ) {
				foreach ( $this-&gt;block_type-&gt;provides_context as $context_name =&gt; $attribute_name ) {
					if ( array_key_exists( $attribute_name, $this-&gt;attributes ) ) {
						$child_context[ $context_name ] = $this-&gt;attributes[ $attribute_name ];
					}
				}
			}

			$this-&gt;inner_blocks = new WP_Block_List( $block['innerBlocks'], $child_context, $registry );
		}

		if ( ! empty( $block['innerHTML'] ) ) {
			$this-&gt;inner_html = $block['innerHTML'];
		}

		if ( ! empty( $block['innerContent'] ) ) {
			$this-&gt;inner_content = $block['innerContent'];
		}
	}

	/**
	 * Returns a value from an inaccessible property.
	 *
	 * This is used to lazily initialize the `attributes` property of a block,
	 * such that it is only prepared with default attributes at the time that
	 * the property is accessed. For all other inaccessible properties, a `null`
	 * value is returned.
	 *
	 * @since 5.5.0
	 *
	 * @param string $name Property name.
	 * @return array|null Prepared attributes, or null.
	 */
	public function __get( $name ) {
		if ( 'attributes' === $name ) {
			$this-&gt;attributes = isset( $this-&gt;parsed_block['attrs'] ) ?
				$this-&gt;parsed_block['attrs'] :
				array();

			if ( ! is_null( $this-&gt;block_type ) ) {
				$this-&gt;attributes = $this-&gt;block_type-&gt;prepare_attributes_for_render( $this-&gt;attributes );
			}

			return $this-&gt;attributes;
		}

		return null;
	}

	/**
	 * Processes the block bindings and updates the block attributes with the values from the sources.
	 *
	 * A block might contain bindings in its attributes. Bindings are mappings
	 * between an attribute of the block and a source. A &quot;source&quot; is a function
	 * registered with `register_block_bindings_source()` that defines how to
	 * retrieve a value from outside the block, e.g. from post meta.
	 *
	 * This function will process those bindings and update the block's attributes
	 * with the values coming from the bindings.
	 *
	 * ### Example
	 *
	 * The &quot;bindings&quot; property for an Image block might look like this:
	 *
	 * ```json
	 * {
	 *   &quot;metadata&quot;: {
	 *     &quot;bindings&quot;: {
	 *       &quot;title&quot;: {
	 *         &quot;source&quot;: &quot;core/post-meta&quot;,
	 *         &quot;args&quot;: { &quot;key&quot;: &quot;text_custom_field&quot; }
	 *       },
	 *       &quot;url&quot;: {
	 *         &quot;source&quot;: &quot;core/post-meta&quot;,
	 *         &quot;args&quot;: { &quot;key&quot;: &quot;url_custom_field&quot; }
	 *       }
	 *     }
	 *   }
	 * }
	 * ```
	 *
	 * The above example will replace the `title` and `url` attributes of the Image
	 * block with the values of the `text_custom_field` and `url_custom_field` post meta.
	 *
	 * @since 6.5.0
	 * @since 6.6.0 Handle the `__default` attribute for pattern overrides.
	 *
	 * @return array The computed block attributes for the provided block bindings.
	 */
	private function process_block_bindings() {
		$parsed_block               = $this-&gt;parsed_block;
		$computed_attributes        = array();
		$supported_block_attributes = array(
			'core/paragraph' =&gt; array( 'content' ),
			'core/heading'   =&gt; array( 'content' ),
			'core/image'     =&gt; array( 'id', 'url', 'title', 'alt' ),
			'core/button'    =&gt; array( 'url', 'text', 'linkTarget', 'rel' ),
		);

		// If the block doesn't have the bindings property, isn't one of the supported
		// block types, or the bindings property is not an array, return the block content.
		if (
			! isset( $supported_block_attributes[ $this-&gt;name ] ) ||
			empty( $parsed_block['attrs']['metadata']['bindings'] ) ||
			! is_array( $parsed_block['attrs']['metadata']['bindings'] )
		) {
			return $computed_attributes;
		}

		$bindings = $parsed_block['attrs']['metadata']['bindings'];

		/*
		 * If the default binding is set for pattern overrides, replace it
		 * with a pattern override binding for all supported attributes.
		 */
		if (
			isset( $bindings['__default']['source'] ) &amp;&amp;
			'core/pattern-overrides' === $bindings['__default']['source']
		) {
			$updated_bindings = array();

			/*
			 * Build a binding array of all supported attributes.
			 * Note that this also omits the `__default` attribute from the
			 * resulting array.
			 */
			foreach ( $supported_block_attributes[ $parsed_block['blockName'] ] as $attribute_name ) {
				// Retain any non-pattern override bindings that might be present.
				$updated_bindings[ $attribute_name ] = isset( $bindings[ $attribute_name ] )
					? $bindings[ $attribute_name ]
					: array( 'source' =&gt; 'core/pattern-overrides' );
			}
			$bindings = $updated_bindings;
		}

		foreach ( $bindings as $attribute_name =&gt; $block_binding ) {
			// If the attribute is not in the supported list, process next attribute.
			if ( ! in_array( $attribute_name, $supported_block_attributes[ $this-&gt;name ], true ) ) {
				continue;
			}
			// If no source is provided, or that source is not registered, process next attribute.
			if ( ! isset( $block_binding['source'] ) || ! is_string( $block_binding['source'] ) ) {
				continue;
			}

			$block_binding_source = get_block_bindings_source( $block_binding['source'] );
			if ( null === $block_binding_source ) {
				continue;
			}

			$source_args  = ! empty( $block_binding['args'] ) &amp;&amp; is_array( $block_binding['args'] ) ? $block_binding['args'] : array();
			$source_value = $block_binding_source-&gt;get_value( $source_args, $this, $attribute_name );

			// If the value is not null, process the HTML based on the block and the attribute.
			if ( ! is_null( $source_value ) ) {
				$computed_attributes[ $attribute_name ] = $source_value;
			}
		}

		return $computed_attributes;
	}

	/**
	 * Depending on the block attribute name, replace its value in the HTML based on the value provided.
	 *
	 * @since 6.5.0
	 *
	 * @param string $block_content  Block content.
	 * @param string $attribute_name The attribute name to replace.
	 * @param mixed  $source_value   The value used to replace in the HTML.
	 * @return string The modified block content.
	 */
	private function replace_html( string $block_content, string $attribute_name, $source_value ) {
		$block_type = $this-&gt;block_type;
		if ( ! isset( $block_type-&gt;attributes[ $attribute_name ]['source'] ) ) {
			return $block_content;
		}

		// Depending on the attribute source, the processing will be different.
		switch ( $block_type-&gt;attributes[ $attribute_name ]['source'] ) {
			case 'html':
			case 'rich-text':
				$block_reader = new WP_HTML_Tag_Processor( $block_content );

				// TODO: Support for CSS selectors whenever they are ready in the HTML API.
				// In the meantime, support comma-separated selectors by exploding them into an array.
				$selectors = explode( ',', $block_type-&gt;attributes[ $attribute_name ]['selector'] );
				// Add a bookmark to the first tag to be able to iterate over the selectors.
				$block_reader-&gt;next_tag();
				$block_reader-&gt;set_bookmark( 'iterate-selectors' );

				// TODO: This shouldn't be needed when the `set_inner_html` function is ready.
				// Store the parent tag and its attributes to be able to restore them later in the button.
				// The button block has a wrapper while the paragraph and heading blocks don't.
				if ( 'core/button' === $this-&gt;name ) {
					$button_wrapper                 = $block_reader-&gt;get_tag();
					$button_wrapper_attribute_names = $block_reader-&gt;get_attribute_names_with_prefix( '' );
					$button_wrapper_attrs           = array();
					foreach ( $button_wrapper_attribute_names as $name ) {
						$button_wrapper_attrs[ $name ] = $block_reader-&gt;get_attribute( $name );
					}
				}

				foreach ( $selectors as $selector ) {
					// If the parent tag, or any of its children, matches the selector, replace the HTML.
					if ( strcasecmp( $block_reader-&gt;get_tag( $selector ), $selector ) === 0 || $block_reader-&gt;next_tag(
						array(
							'tag_name' =&gt; $selector,
						)
					) ) {
						$block_reader-&gt;release_bookmark( 'iterate-selectors' );

						// TODO: Use `set_inner_html` method whenever it's ready in the HTML API.
						// Until then, it is hardcoded for the paragraph, heading, and button blocks.
						// Store the tag and its attributes to be able to restore them later.
						$selector_attribute_names = $block_reader-&gt;get_attribute_names_with_prefix( '' );
						$selector_attrs           = array();
						foreach ( $selector_attribute_names as $name ) {
							$selector_attrs[ $name ] = $block_reader-&gt;get_attribute( $name );
						}
						$selector_markup = &quot;&lt;$selector&gt;&quot; . wp_kses_post( $source_value ) . &quot;&lt;/$selector&gt;&quot;;
						$amended_content = new WP_HTML_Tag_Processor( $selector_markup );
						$amended_content-&gt;next_tag();
						foreach ( $selector_attrs as $attribute_key =&gt; $attribute_value ) {
							$amended_content-&gt;set_attribute( $attribute_key, $attribute_value );
						}
						if ( 'core/paragraph' === $this-&gt;name || 'core/heading' === $this-&gt;name ) {
							return $amended_content-&gt;get_updated_html();
						}
						if ( 'core/button' === $this-&gt;name ) {
							$button_markup  = &quot;&lt;$button_wrapper&gt;{$amended_content-&gt;get_updated_html()}&lt;/$button_wrapper&gt;&quot;;
							$amended_button = new WP_HTML_Tag_Processor( $button_markup );
							$amended_button-&gt;next_tag();
							foreach ( $button_wrapper_attrs as $attribute_key =&gt; $attribute_value ) {
								$amended_button-&gt;set_attribute( $attribute_key, $attribute_value );
							}
							return $amended_button-&gt;get_updated_html();
						}
					} else {
						$block_reader-&gt;seek( 'iterate-selectors' );
					}
				}
				$block_reader-&gt;release_bookmark( 'iterate-selectors' );
				return $block_content;

			case 'attribute':
				$amended_content = new WP_HTML_Tag_Processor( $block_content );
				if ( ! $amended_content-&gt;next_tag(
					array(
						// TODO: build the query from CSS selector.
						'tag_name' =&gt; $block_type-&gt;attributes[ $attribute_name ]['selector'],
					)
				) ) {
					return $block_content;
				}
				$amended_content-&gt;set_attribute( $block_type-&gt;attributes[ $attribute_name ]['attribute'], $source_value );
				return $amended_content-&gt;get_updated_html();

			default:
				return $block_content;
		}
	}


	/**
	 * Generates the render output for the block.
	 *
	 * @since 5.5.0
	 * @since 6.5.0 Added block bindings processing.
	 *
	 * @global WP_Post $post Global post object.
	 *
	 * @param array $options {
	 *     Optional options object.
	 *
	 *     @type bool $dynamic Defaults to 'true'. Optionally set to false to avoid using the block's render_callback.
	 * }
	 * @return string Rendered block output.
	 */
	public function render( $options = array() ) {
		global $post;

		/*
		 * There can be only one root interactive block at a time because the rendered HTML of that block contains
		 * the rendered HTML of all its inner blocks, including any interactive block.
		 */
		static $root_interactive_block = null;
		/**
		 * Filters whether Interactivity API should process directives.
		 *
		 * @since 6.6.0
		 *
		 * @param bool $enabled Whether the directives processing is enabled.
		 */
		$interactivity_process_directives_enabled = apply_filters( 'interactivity_process_directives', true );
		if (
			$interactivity_process_directives_enabled &amp;&amp; null === $root_interactive_block &amp;&amp; (
				( isset( $this-&gt;block_type-&gt;supports['interactivity'] ) &amp;&amp; true === $this-&gt;block_type-&gt;supports['interactivity'] ) ||
				! empty( $this-&gt;block_type-&gt;supports['interactivity']['interactive'] )
			)
		) {
			$root_interactive_block = $this;
		}

		$options = wp_parse_args(
			$options,
			array(
				'dynamic' =&gt; true,
			)
		);

		// Process the block bindings and get attributes updated with the values from the sources.
		$computed_attributes = $this-&gt;process_block_bindings();
		if ( ! empty( $computed_attributes ) ) {
			// Merge the computed attributes with the original attributes.
			$this-&gt;attributes = array_merge( $this-&gt;attributes, $computed_attributes );
		}

		$is_dynamic    = $options['dynamic'] &amp;&amp; $this-&gt;name &amp;&amp; null !== $this-&gt;block_type &amp;&amp; $this-&gt;block_type-&gt;is_dynamic();
		$block_content = '';

		if ( ! $options['dynamic'] || empty( $this-&gt;block_type-&gt;skip_inner_blocks ) ) {
			$index = 0;

			foreach ( $this-&gt;inner_content as $chunk ) {
				if ( is_string( $chunk ) ) {
					$block_content .= $chunk;
				} else {
					$inner_block  = $this-&gt;inner_blocks[ $index ];
					$parent_block = $this;

					/** This filter is documented in wp-includes/blocks.php */
					$pre_render = apply_filters( 'pre_render_block', null, $inner_block-&gt;parsed_block, $parent_block );

					if ( ! is_null( $pre_render ) ) {
						$block_content .= $pre_render;
					} else {
						$source_block = $inner_block-&gt;parsed_block;

						/** This filter is documented in wp-includes/blocks.php */
						$inner_block-&gt;parsed_block = apply_filters( 'render_block_data', $inner_block-&gt;parsed_block, $source_block, $parent_block );

						/** This filter is documented in wp-includes/blocks.php */
						$inner_block-&gt;context = apply_filters( 'render_block_context', $inner_block-&gt;context, $inner_block-&gt;parsed_block, $parent_block );

						$block_content .= $inner_block-&gt;render();
					}

					++$index;
				}
			}
		}

		if ( ! empty( $computed_attributes ) &amp;&amp; ! empty( $block_content ) ) {
			foreach ( $computed_attributes as $attribute_name =&gt; $source_value ) {
				$block_content = $this-&gt;replace_html( $block_content, $attribute_name, $source_value );
			}
		}

		if ( $is_dynamic ) {
			$global_post = $post;
			$parent      = WP_Block_Supports::$block_to_render;

			WP_Block_Supports::$block_to_render = $this-&gt;parsed_block;

			$block_content = (string) call_user_func( $this-&gt;block_type-&gt;render_callback, $this-&gt;attributes, $block_content, $this );

			WP_Block_Supports::$block_to_render = $parent;

			$post = $global_post;
		}

		if ( ( ! empty( $this-&gt;block_type-&gt;script_handles ) ) ) {
			foreach ( $this-&gt;block_type-&gt;script_handles as $script_handle ) {
				wp_enqueue_script( $script_handle );
			}
		}

		if ( ! empty( $this-&gt;block_type-&gt;view_script_handles ) ) {
			foreach ( $this-&gt;block_type-&gt;view_script_handles as $view_script_handle ) {
				wp_enqueue_script( $view_script_handle );
			}
		}

		if ( ! empty( $this-&gt;block_type-&gt;view_script_module_ids ) ) {
			foreach ( $this-&gt;block_type-&gt;view_script_module_ids as $view_script_module_id ) {
				wp_enqueue_script_module( $view_script_module_id );
			}
		}

		if ( ( ! empty( $this-&gt;block_type-&gt;style_handles ) ) ) {
			foreach ( $this-&gt;block_type-&gt;style_handles as $style_handle ) {
				wp_enqueue_style( $style_handle );
			}
		}

		if ( ( ! empty( $this-&gt;block_type-&gt;view_style_handles ) ) ) {
			foreach ( $this-&gt;block_type-&gt;view_style_handles as $view_style_handle ) {
				wp_enqueue_style( $view_style_handle );
			}
		}

		/**
		 * Filters the content of a single block.
		 *
		 * @since 5.0.0
		 * @since 5.9.0 The `$instance` parameter was added.
		 *
		 * @param string   $block_content The block content.
		 * @param array    $block         The full block, including name and attributes.
		 * @param WP_Block $instance      The block instance.
		 */
		$block_content = apply_filters( 'render_block', $block_content, $this-&gt;parsed_block, $this );

		/**
		 * Filters the content of a single block.
		 *
		 * The dynamic portion of the hook name, `$name`, refers to
		 * the block name, e.g. &quot;core/paragraph&quot;.
		 *
		 * @since 5.7.0
		 * @since 5.9.0 The `$instance` parameter was added.
		 *
		 * @param string   $block_content The block content.
		 * @param array    $block         The full block, including name and attributes.
		 * @param WP_Block $instance      The block instance.
		 */
		$block_content = apply_filters( &quot;render_block_{$this-&gt;name}&quot;, $block_content, $this-&gt;parsed_block, $this );

		if ( $root_interactive_block === $this ) {
			// The root interactive block has finished rendering. Time to process directives.
			$block_content          = wp_interactivity_process_directives( $block_content );
			$root_interactive_block = null;
		}

		return $block_content;
	}
}
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