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<?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 ); }