name : class-wp-block-bindings-registry.php <?php /** * Block Bindings API: WP_Block_Bindings_Registry class. * * Supports overriding content in blocks by connecting them to different sources. * * @package WordPress * @subpackage Block Bindings * @since 6.5.0 */ /** * Core class used for interacting with block bindings sources. * * @since 6.5.0 */ final class WP_Block_Bindings_Registry { /** * Holds the registered block bindings sources, keyed by source identifier. * * @since 6.5.0 * @var WP_Block_Bindings_Source[] */ private $sources = array(); /** * Container for the main instance of the class. * * @since 6.5.0 * @var WP_Block_Bindings_Registry|null */ private static $instance = null; /** * Supported source properties that can be passed to the registered source. * * @since 6.5.0 * @var string[] */ private $allowed_source_properties = array( 'label', 'get_value_callback', 'uses_context', ); /** * Supported blocks that can use the block bindings API. * * @since 6.5.0 * @var string[] */ private $supported_blocks = array( 'core/paragraph', 'core/heading', 'core/image', 'core/button', ); /** * Registers a new block bindings source. * * This is a low-level method. For most use cases, it is recommended to use * the `register_block_bindings_source()` function instead. * * @see register_block_bindings_source() * * Sources are used to override block's original attributes with a value * coming from the source. Once a source is registered, it can be used by a * block by setting its `metadata.bindings` attribute to a value that refers * to the source. * * @since 6.5.0 * * @param string $source_name The name of the source. It must be a string containing a namespace prefix, i.e. * `my-plugin/my-custom-source`. It must only contain lowercase alphanumeric * characters, the forward slash `/` and dashes. * @param array $source_properties { * The array of arguments that are used to register a source. * * @type string $label The label of the source. * @type callable $get_value_callback A callback executed when the source is processed during block rendering. * The callback should have the following signature: * * `function( $source_args, $block_instance, $attribute_name ): mixed` * - @param array $source_args Array containing source arguments * used to look up the override value, * i.e. {"key": "foo"}. * - @param WP_Block $block_instance The block instance. * - @param string $attribute_name The name of the target attribute. * The callback has a mixed return type; it may return a string to override * the block's original value, null, false to remove an attribute, etc. * @type string[] $uses_context Optional. Array of values to add to block `uses_context` needed by the source. * } * @return WP_Block_Bindings_Source|false Source when the registration was successful, or `false` on failure. */ public function register( string $source_name, array $source_properties ) { if ( ! is_string( $source_name ) ) { _doing_it_wrong( __METHOD__, __( 'Block bindings source name must be a string.' ), '6.5.0' ); return false; } if ( preg_match( '/[A-Z]+/', $source_name ) ) { _doing_it_wrong( __METHOD__, __( 'Block bindings source names must not contain uppercase characters.' ), '6.5.0' ); return false; } $name_matcher = '/^[a-z0-9-]+\/[a-z0-9-]+$/'; if ( ! preg_match( $name_matcher, $source_name ) ) { _doing_it_wrong( __METHOD__, __( 'Block bindings source names must contain a namespace prefix. Example: my-plugin/my-custom-source' ), '6.5.0' ); return false; } if ( $this->is_registered( $source_name ) ) { _doing_it_wrong( __METHOD__, /* translators: %s: Block bindings source name. */ sprintf( __( 'Block bindings source "%s" already registered.' ), $source_name ), '6.5.0' ); return false; } // Validates that the source properties contain the label. if ( ! isset( $source_properties['label'] ) ) { _doing_it_wrong( __METHOD__, __( 'The $source_properties must contain a "label".' ), '6.5.0' ); return false; } // Validates that the source properties contain the get_value_callback. if ( ! isset( $source_properties['get_value_callback'] ) ) { _doing_it_wrong( __METHOD__, __( 'The $source_properties must contain a "get_value_callback".' ), '6.5.0' ); return false; } // Validates that the get_value_callback is a valid callback. if ( ! is_callable( $source_properties['get_value_callback'] ) ) { _doing_it_wrong( __METHOD__, __( 'The "get_value_callback" parameter must be a valid callback.' ), '6.5.0' ); return false; } // Validates that the uses_context parameter is an array. if ( isset( $source_properties['uses_context'] ) && ! is_array( $source_properties['uses_context'] ) ) { _doing_it_wrong( __METHOD__, __( 'The "uses_context" parameter must be an array.' ), '6.5.0' ); return false; } if ( ! empty( array_diff( array_keys( $source_properties ), $this->allowed_source_properties ) ) ) { _doing_it_wrong( __METHOD__, __( 'The $source_properties array contains invalid properties.' ), '6.5.0' ); return false; } $source = new WP_Block_Bindings_Source( $source_name, $source_properties ); $this->sources[ $source_name ] = $source; // Adds `uses_context` defined by block bindings sources. add_filter( 'get_block_type_uses_context', function ( $uses_context, $block_type ) use ( $source ) { if ( ! in_array( $block_type->name, $this->supported_blocks, true ) || empty( $source->uses_context ) ) { return $uses_context; } // Use array_values to reset the array keys. return array_values( array_unique( array_merge( $uses_context, $source->uses_context ) ) ); }, 10, 2 ); return $source; } /** * Unregisters a block bindings source. * * @since 6.5.0 * * @param string $source_name Block bindings source name including namespace. * @return WP_Block_Bindings_Source|false The unregistered block bindings source on success and `false` otherwise. */ public function unregister( string $source_name ) { if ( ! $this->is_registered( $source_name ) ) { _doing_it_wrong( __METHOD__, /* translators: %s: Block bindings source name. */ sprintf( __( 'Block binding "%s" not found.' ), $source_name ), '6.5.0' ); return false; } $unregistered_source = $this->sources[ $source_name ]; unset( $this->sources[ $source_name ] ); return $unregistered_source; } /** * Retrieves the list of all registered block bindings sources. * * @since 6.5.0 * * @return WP_Block_Bindings_Source[] The array of registered sources. */ public function get_all_registered() { return $this->sources; } /** * Retrieves a registered block bindings source. * * @since 6.5.0 * * @param string $source_name The name of the source. * @return WP_Block_Bindings_Source|null The registered block bindings source, or `null` if it is not registered. */ public function get_registered( string $source_name ) { if ( ! $this->is_registered( $source_name ) ) { return null; } return $this->sources[ $source_name ]; } /** * Checks if a block bindings source is registered. * * @since 6.5.0 * * @param string $source_name The name of the source. * @return bool `true` if the block bindings source is registered, `false` otherwise. */ public function is_registered( $source_name ) { return isset( $this->sources[ $source_name ] ); } /** * Wakeup magic method. * * @since 6.5.0 */ public function __wakeup() { if ( ! $this->sources ) { return; } if ( ! is_array( $this->sources ) ) { throw new UnexpectedValueException(); } foreach ( $this->sources as $value ) { if ( ! $value instanceof WP_Block_Bindings_Source ) { throw new UnexpectedValueException(); } } } /** * Utility method to retrieve the main instance of the class. * * The instance will be created if it does not exist yet. * * @since 6.5.0 * * @return WP_Block_Bindings_Registry The main instance. */ public static function get_instance() { if ( null === self::$instance ) { self::$instance = new self(); } return self::$instance; } }