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class-wp-block-supports.php (5278B)

---

 <?php
 /**
  * Block support flags.
  *
  * @package WordPress
  *
  * @since 5.6.0
  */
 
 /**
  * Class encapsulating and implementing Block Supports.
  *
  * @since 5.6.0
  *
  * @access private
  */
 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 registes 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
 	 *
 	 * @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 array Array of HTML attributes.
 	 */
 	public function apply_block_supports() {
 		$block_attributes = self::$block_to_render['attrs'];
 		$block_type       = WP_Block_Type_Registry::get_instance()->get_registered(
 			self::$block_to_render['blockName']
 		);
 
 		// If no render_callback, assume styles have been previously handled.
 		if ( ! $block_type || empty( $block_type ) ) {
 			return array();
 		}
 
 		$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 ( ! property_exists( $block_type, 'supports' ) ) {
 				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 array $extra_attributes Optional. Extra attributes to render on the block wrapper.
  *
  * @return string String of HTML classes.
  */
 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' );
 	$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 );
 }