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📝 Edit File: class-wp-block-supports.php

<?php
/**
 * Block support flags.
 *
 * @package WordPress
 *
 * @since 5.6.0
 */

/**
 * Class encapsulating and implementing Block Supports.
 *
 * @since 5.6.0
 *
 * @access private
 */
#[AllowDynamicProperties]
class WP_Block_Supports {

/**
	 * Config.
	 *
	 * @since 5.6.0
	 * @var array
	 */
	private $block_supports = array();

/**
	 * Tracks the current block to be rendered.
	 *
	 * @since 5.6.0
	 * @var array
	 */
	public static $block_to_render = null;

/**
	 * Container for the main instance of the class.
	 *
	 * @since 5.6.0
	 * @var WP_Block_Supports|null
	 */
	private static $instance = null;

/**
	 * Utility method to retrieve the main instance of the class.
	 *
	 * The instance will be created if it does not exist yet.
	 *
	 * @since 5.6.0
	 *
	 * @return WP_Block_Supports The main instance.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

return self::$instance;
	}

/**
	 * Initializes the block supports. It registers the block supports block attributes.
	 *
	 * @since 5.6.0
	 */
	public static function init() {
		$instance = self::get_instance();
		$instance->register_attributes();
	}

/**
	 * Registers a block support.
	 *
	 * @since 5.6.0
	 *
	 * @link https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/
	 *
	 * @param string $block_support_name   Block support name.
	 * @param array  $block_support_config Array containing the properties of the block support.
	 */
	public function register( $block_support_name, $block_support_config ) {
		$this->block_supports[ $block_support_name ] = array_merge(
			$block_support_config,
			array( 'name' => $block_support_name )
		);
	}

/**
	 * Generates an array of HTML attributes, such as classes, by applying to
	 * the given block all of the features that the block supports.
	 *
	 * @since 5.6.0
	 *
	 * @return string[] Array of HTML attribute values keyed by their name.
	 */
	public function apply_block_supports() {
		$block_type = WP_Block_Type_Registry::get_instance()->get_registered(
			self::$block_to_render['blockName']
		);

// If no render_callback, assume styles have been previously handled.
		if ( ! $block_type || empty( $block_type ) ) {
			return array();
		}

$block_attributes = array_key_exists( 'attrs', self::$block_to_render ) && is_array( self::$block_to_render['attrs'] )
			? $block_type->prepare_attributes_for_render( self::$block_to_render['attrs'] )
			: array();

$output = array();
		foreach ( $this->block_supports as $block_support_config ) {
			if ( ! isset( $block_support_config['apply'] ) ) {
				continue;
			}

$new_attributes = call_user_func(
				$block_support_config['apply'],
				$block_type,
				$block_attributes
			);

if ( ! empty( $new_attributes ) ) {
				foreach ( $new_attributes as $attribute_name => $attribute_value ) {
					if ( empty( $output[ $attribute_name ] ) ) {
						$output[ $attribute_name ] = $attribute_value;
					} else {
						$output[ $attribute_name ] .= " $attribute_value";
					}
				}
			}
		}

return $output;
	}

/**
	 * Registers the block attributes required by the different block supports.
	 *
	 * @since 5.6.0
	 */
	private function register_attributes() {
		$block_registry         = WP_Block_Type_Registry::get_instance();
		$registered_block_types = $block_registry->get_all_registered();
		foreach ( $registered_block_types as $block_type ) {
			if ( ! ( $block_type instanceof WP_Block_Type ) ) {
				continue;
			}
			if ( ! $block_type->attributes ) {
				$block_type->attributes = array();
			}

foreach ( $this->block_supports as $block_support_config ) {
				if ( ! isset( $block_support_config['register_attribute'] ) ) {
					continue;
				}

call_user_func(
					$block_support_config['register_attribute'],
					$block_type
				);
			}
		}
	}
}

/**
 * Generates a string of attributes by applying to the current block being
 * rendered all of the features that the block supports.
 *
 * @since 5.6.0
 *
 * @param string[] $extra_attributes Optional. Array of extra attributes to render on the block wrapper.
 * @return string String of HTML attributes.
 */
function get_block_wrapper_attributes( $extra_attributes = array() ) {
	$new_attributes = WP_Block_Supports::get_instance()->apply_block_supports();

if ( empty( $new_attributes ) && empty( $extra_attributes ) ) {
		return '';
	}

// This is hardcoded on purpose.
	// We only support a fixed list of attributes.
	$attributes_to_merge = array( 'style', 'class', 'id' );
	$attributes          = array();
	foreach ( $attributes_to_merge as $attribute_name ) {
		if ( empty( $new_attributes[ $attribute_name ] ) && empty( $extra_attributes[ $attribute_name ] ) ) {
			continue;
		}

if ( empty( $new_attributes[ $attribute_name ] ) ) {
			$attributes[ $attribute_name ] = $extra_attributes[ $attribute_name ];
			continue;
		}

if ( empty( $extra_attributes[ $attribute_name ] ) ) {
			$attributes[ $attribute_name ] = $new_attributes[ $attribute_name ];
			continue;
		}

$attributes[ $attribute_name ] = $extra_attributes[ $attribute_name ] . ' ' . $new_attributes[ $attribute_name ];
	}

foreach ( $extra_attributes as $attribute_name => $value ) {
		if ( ! in_array( $attribute_name, $attributes_to_merge, true ) ) {
			$attributes[ $attribute_name ] = $value;
		}
	}

if ( empty( $attributes ) ) {
		return '';
	}

$normalized_attributes = array();
	foreach ( $attributes as $key => $value ) {
		$normalized_attributes[] = $key . '="' . esc_attr( $value ) . '"';
	}

return implode( ' ', $normalized_attributes );
}

Type	Item Name	Actions
📁	..
📁	assets
📁	block-bindings
📁	block-patterns
📁	block-supports
📁	blocks
📁	certificates
📁	css
📁	customize
📁	fonts
📁	html-api
📁	ID3
📁	images
📁	interactivity-api
📁	IXR
📁	js
📁	l10n
📁	php-compat
📁	PHPMailer
📁	pomo
📁	Requests
📁	rest-api
📁	SimplePie
📁	sitemaps
📁	sodium_compat
📁	style-engine
📁	Text
📁	theme-compat
📁	widgets
📄	admin-bar.php
📄	atomlib.php
📄	author-template.php
📄	block-bindings.php
📄	block-editor.php
📄	block-i18n.json
📄	block-patterns.php
📄	block-template-utils.php
📄	block-template.php
📄	blocks.php
📄	bookmark-template.php
📄	bookmark.php
📄	cache-compat.php
📄	cache.php
📄	canonical.php
📄	capabilities.php
📄	category-template.php
📄	category.php
📄	class-avif-info.php
📄	class-feed.php
📄	class-http.php
📄	class-IXR.php
📄	class-json.php
📄	class-oembed.php
📄	class-phpass.php
📄	class-phpmailer.php
📄	class-pop3.php
📄	class-requests.php
📄	class-simplepie.php
📄	class-smtp.php
📄	class-snoopy.php
📄	class-walker-category-dropdown.php
📄	class-walker-category.php
📄	class-walker-comment.php
📄	class-walker-nav-menu.php
📄	class-walker-page-dropdown.php
📄	class-walker-page.php
📄	class-wp-admin-bar.php
📄	class-wp-ajax-response.php
📄	class-wp-application-passwords.php
📄	class-wp-block-bindings-registry.php
📄	class-wp-block-bindings-source.php
📄	class-wp-block-editor-context.php
📄	class-wp-block-list.php
📄	class-wp-block-metadata-registry.php
📄	class-wp-block-parser-block.php
📄	class-wp-block-parser-frame.php
📄	class-wp-block-parser.php
📄	class-wp-block-pattern-categories-registry.php
📄	class-wp-block-patterns-registry.php
📄	class-wp-block-styles-registry.php
📄	class-wp-block-supports.php
📄	class-wp-block-template.php
📄	class-wp-block-templates-registry.php
📄	class-wp-block-type-registry.php
📄	class-wp-block-type.php
📄	class-wp-block.php
📄	class-wp-classic-to-block-menu-converter.php
📄	class-wp-comment-query.php
📄	class-wp-comment.php
📄	class-wp-customize-control.php
📄	class-wp-customize-manager.php
📄	class-wp-customize-nav-menus.php
📄	class-wp-customize-panel.php
📄	class-wp-customize-section.php
📄	class-wp-customize-setting.php
📄	class-wp-customize-widgets.php
📄	class-wp-date-query.php
📄	class-wp-dependencies.php
📄	class-wp-dependency.php
📄	class-wp-duotone.php
📄	class-wp-editor.php
📄	class-wp-embed.php
📄	class-wp-error.php
📄	class-wp-exception.php
📄	class-wp-fatal-error-handler.php
📄	class-wp-feed-cache-transient.php
📄	class-wp-feed-cache.php
📄	class-wp-hook.php
📄	class-wp-http-cookie.php
📄	class-wp-http-curl.php
📄	class-wp-http-encoding.php
📄	class-wp-http-ixr-client.php
📄	class-wp-http-proxy.php
📄	class-wp-http-requests-hooks.php
📄	class-wp-http-requests-response.php
📄	class-wp-http-response.php
📄	class-wp-http-streams.php
📄	class-wp-http.php
📄	class-wp-image-editor-gd.php
📄	class-wp-image-editor-imagick.php
📄	class-wp-image-editor.php
📄	class-wp-list-util.php
📄	class-wp-locale-switcher.php
📄	class-wp-locale.php
📄	class-wp-matchesmapregex.php
📄	class-wp-meta-query.php
📄	class-wp-metadata-lazyloader.php
📄	class-wp-navigation-fallback.php
📄	class-wp-network-query.php
📄	class-wp-network.php
📄	class-wp-object-cache.php
📄	class-wp-oembed-controller.php
📄	class-wp-oembed.php
📄	class-wp-paused-extensions-storage.php
📄	class-wp-plugin-dependencies.php
📄	class-wp-post-type.php
📄	class-wp-post.php
📄	class-wp-query.php
📄	class-wp-recovery-mode-cookie-service.php
📄	class-wp-recovery-mode-email-service.php
📄	class-wp-recovery-mode-key-service.php
📄	class-wp-recovery-mode-link-service.php
📄	class-wp-recovery-mode.php
📄	class-wp-rewrite.php
📄	class-wp-role.php
📄	class-wp-roles.php
📄	class-wp-script-modules.php
📄	class-wp-scripts.php
📄	class-wp-session-tokens.php
📄	class-wp-simplepie-file.php
📄	class-wp-simplepie-sanitize-kses.php
📄	class-wp-site-query.php
📄	class-wp-site.php
📄	class-wp-styles.php
📄	class-wp-tax-query.php
📄	class-wp-taxonomy.php
📄	class-wp-term-query.php
📄	class-wp-term.php
📄	class-wp-text-diff-renderer-inline.php
📄	class-wp-text-diff-renderer-table.php
📄	class-wp-textdomain-registry.php
📄	class-wp-theme-json-data.php
📄	class-wp-theme-json-resolver.php
📄	class-wp-theme-json-schema.php
📄	class-wp-theme-json.php
📄	class-wp-theme.php
📄	class-wp-token-map.php
📄	class-wp-user-meta-session-tokens.php
📄	class-wp-user-query.php
📄	class-wp-user-request.php
📄	class-wp-user.php
📄	class-wp-walker.php
📄	class-wp-widget-factory.php
📄	class-wp-widget.php
📄	class-wp-xmlrpc-server.php
📄	class-wp.php
📄	class-wpdb.php
📄	class.wp-dependencies.php
📄	class.wp-scripts.php
📄	class.wp-styles.php
📄	comment-template.php
📄	comment.php
📄	compat.php
📄	cron.php
📄	date.php
📄	default-constants.php
📄	default-filters.php
📄	default-widgets.php
📄	deprecated.php
📄	embed-template.php
📄	embed.php
📄	error-protection.php
📄	feed-atom-comments.php
📄	feed-atom.php
📄	feed-rdf.php
📄	feed-rss.php
📄	feed-rss2-comments.php
📄	feed-rss2.php
📄	feed.php
📄	fonts.php
📄	formatting.php
📄	functions.php
📄	functions.wp-scripts.php
📄	functions.wp-styles.php
📄	general-template.php
📄	global-styles-and-settings.php
📄	http.php
📄	https-detection.php
📄	https-migration.php
📄	kses.php
📄	l10n.php
📄	link-template.php
📄	load.php
📄	locale.php
📄	media-template.php
📄	media.php
📄	meta.php
📄	ms-blogs.php
📄	ms-default-constants.php
📄	ms-default-filters.php
📄	ms-deprecated.php
📄	ms-files.php
📄	ms-functions.php
📄	ms-load.php
📄	ms-network.php
📄	ms-settings.php
📄	ms-site.php
📄	nav-menu-template.php
📄	nav-menu.php
📄	option.php
📄	pluggable-deprecated.php
📄	pluggable.php
📄	plugin.php
📄	post-formats.php
📄	post-template.php
📄	post-thumbnail-template.php
📄	post.php
📄	query.php
📄	registration-functions.php
📄	registration.php
📄	rest-api.php
📄	revision.php
📄	rewrite.php
📄	robots-template.php
📄	rss-functions.php
📄	rss.php
📄	script-loader.php
📄	script-modules.php
📄	session.php
📄	shortcodes.php
📄	sitemaps.php
📄	spl-autoload-compat.php
📄	style-engine.php
📄	taxonomy.php
📄	template-canvas.php
📄	template-loader.php
📄	template.php
📄	theme-i18n.json
📄	theme-previews.php
📄	theme-templates.php
📄	theme.json
📄	theme.php
📄	update.php
📄	user.php
📄	vars.php
📄	version.php
📄	widgets.php
📄	wp-db.php
📄	wp-diff.php