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Edit File: block-bindings.php
<?php /** * Block Bindings API * * Contains functions for managing block bindings in WordPress. * * @package WordPress * @subpackage Block Bindings * @since 6.5.0 */ /** * Registers a new block bindings source. * * Registering a source consists of defining a **name** for that source and a callback function specifying * how to get a value from that source and pass it to a block attribute. * * Once a source is registered, any block that supports the Block Bindings API can use a value * from that source by setting its `metadata.bindings` attribute to a value that refers to the source. * * Note that `register_block_bindings_source()` should be called from a handler attached to the `init` hook. * * * ## Example * * ### Registering a source * * First, you need to define a function that will be used to get the value from the source. * * function my_plugin_get_custom_source_value( array $source_args, $block_instance, string $attribute_name ) { * // Your custom logic to get the value from the source. * // For example, you can use the `$source_args` to look up a value in a custom table or get it from an external API. * $value = $source_args['key']; * * return "The value passed to the block is: $value" * } * * The `$source_args` will contain the arguments passed to the source in the block's * `metadata.bindings` attribute. See the example in the "Usage in a block" section below. * * function my_plugin_register_block_bindings_sources() { * register_block_bindings_source( 'my-plugin/my-custom-source', array( * 'label' => __( 'My Custom Source', 'my-plugin' ), * 'get_value_callback' => 'my_plugin_get_custom_source_value', * ) ); * } * add_action( 'init', 'my_plugin_register_block_bindings_sources' ); * * ### Usage in a block * * In a block's `metadata.bindings` attribute, you can specify the source and * its arguments. Such a block will use the source to override the block * attribute's value. For example: * * <!-- wp:paragraph { * "metadata": { * "bindings": { * "content": { * "source": "my-plugin/my-custom-source", * "args": { * "key": "you can pass any custom arguments here" * } * } * } * } * } --> * <p>Fallback text that gets replaced.</p> * <!-- /wp:paragraph --> * * @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 an 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. */ function register_block_bindings_source( string $source_name, array $source_properties ) { return WP_Block_Bindings_Registry::get_instance()->register( $source_name, $source_properties ); } /** * 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. */ function unregister_block_bindings_source( string $source_name ) { return WP_Block_Bindings_Registry::get_instance()->unregister( $source_name ); } /** * Retrieves the list of all registered block bindings sources. * * @since 6.5.0 * * @return WP_Block_Bindings_Source[] The array of registered block bindings sources. */ function get_all_registered_block_bindings_sources() { return WP_Block_Bindings_Registry::get_instance()->get_all_registered(); } /** * 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. */ function get_block_bindings_source( string $source_name ) { return WP_Block_Bindings_Registry::get_instance()->get_registered( $source_name ); } /** * Retrieves the list of block attributes supported by block bindings. * * @since 6.9.0 * @since 7.1.0 Added support for the List Item block. * * @param string $block_type The block type whose supported attributes are being retrieved. * @return array The list of block attributes that are supported by block bindings. */ function get_block_bindings_supported_attributes( $block_type ) { $block_bindings_supported_attributes = array( 'core/paragraph' => array( 'content' ), 'core/heading' => array( 'content' ), 'core/list-item' => array( 'content' ), 'core/image' => array( 'id', 'url', 'title', 'alt', 'caption' ), 'core/button' => array( 'url', 'text', 'linkTarget', 'rel' ), 'core/post-date' => array( 'datetime' ), 'core/navigation-link' => array( 'url' ), 'core/navigation-submenu' => array( 'url' ), ); $supported_block_attributes = isset( $block_type, $block_bindings_supported_attributes[ $block_type ] ) ? $block_bindings_supported_attributes[ $block_type ] : array(); /** * Filters the supported block attributes for block bindings. * * @since 6.9.0 * * @param string[] $supported_block_attributes The block's attributes that are supported by block bindings. * @param string $block_type The block type whose attributes are being filtered. */ $supported_block_attributes = apply_filters( 'block_bindings_supported_attributes', $supported_block_attributes, $block_type ); /** * Filters the supported block attributes for block bindings. * * The dynamic portion of the hook name, `$block_type`, refers to the block type * whose attributes are being filtered. * * @since 6.9.0 * * @param string[] $supported_block_attributes The block's attributes that are supported by block bindings. */ $supported_block_attributes = apply_filters( "block_bindings_supported_attributes_{$block_type}", $supported_block_attributes ); return $supported_block_attributes; }