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Editor: Add the Block Bindings API.

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This introduces the Block Bindings API for WordPress.

The API allows developers to connects block attributes to different sources. In this PR, two such sources are included: "post meta" and "pattern". Attributes connected to sources can have their HTML replaced by values coming from the source in a way defined by the binding.

Props czapla, lgladdy, gziolo, sc0ttkclark, swissspidy, artemiosans, kevin940726, fabiankaegy, santosguillamot, talldanwp, wildworks.
Fixes #60282.
Built from https://develop.svn.wordpress.org/trunk@57514


git-svn-id: http://core.svn.wordpress.org/trunk@57015 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
youknowriad 2024-02-01 12:54:15 +00:00
parent 3af51954e0
commit a2786a3785
7 changed files with 292 additions and 3 deletions
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4
wp-includes/block-bindings.php
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@ -19,7 +19,9 @@
*
* @since 6.5.0
*
* @param string $source_name The name of the source.
* @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.
*

34
wp-includes/block-bindings/sources/pattern.php Normal file
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@ -0,0 +1,34 @@
<?php
/**
* The "pattern" source for the Block Bindings API. This source is used by the
* Pattern Overrides.
*
* @since 6.5.0
* @package WordPress
*/
function pattern_source_callback( $source_attrs, $block_instance, $attribute_name ) {
if ( ! _wp_array_get( $block_instance->attributes, array( 'metadata', 'id' ), false ) ) {
return null;
}
$block_id = $block_instance->attributes['metadata']['id'];
return _wp_array_get( $block_instance->context, array( 'pattern/overrides', $block_id, $attribute_name ), null );
}
/**
* Registers the "pattern" source for the Block Bindings API.
*
* @access private
* @since 6.5.0
*/
function _register_block_bindings_pattern_overrides_source() {
register_block_bindings_source(
'core/pattern-overrides',
array(
'label' => _x( 'Pattern Overrides', 'block bindings source' ),
'get_value_callback' => 'pattern_source_callback',
)
);
}
add_action( 'init', '_register_block_bindings_pattern_overrides_source' );

47
wp-includes/block-bindings/sources/post-meta.php Normal file
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@ -0,0 +1,47 @@
<?php
/**
* Add the post_meta source to the Block Bindings API.
*
* @since 6.5.0
* @package WordPress
*/
function post_meta_source_callback( $source_attrs ) {
if ( ! isset( $source_attrs['key'] ) ) {
return null;
}
// Use the postId attribute if available
if ( isset( $source_attrs['postId'] ) ) {
$post_id = $source_attrs['postId'];
} else {
// $block_instance->context['postId'] is not available in the Image block.
$post_id = get_the_ID();
}
// If a post isn't public, we need to prevent
// unauthorized users from accessing the post meta.
$post = get_post( $post_id );
if ( ( ! is_post_publicly_viewable( $post ) && ! current_user_can( 'read_post', $post_id ) ) || post_password_required( $post ) ) {
return null;
}
return get_post_meta( $post_id, $source_attrs['key'], true );
}
/**
* Registers the "post_meta" source for the Block Bindings API.
*
* @access private
* @since 6.5.0
*/
function _register_block_bindings_post_meta_source() {
register_block_bindings_source(
'core/post-meta',
array(
'label' => _x( 'Post Meta', 'block bindings source' ),
'get_value_callback' => 'post_meta_source_callback',
)
);
}
add_action( 'init', '_register_block_bindings_post_meta_source' );

4
wp-includes/class-wp-block-bindings-registry.php
View File

@ -42,7 +42,9 @@ final class WP_Block_Bindings_Registry {
*
* @since 6.5.0
*
* @param string $source_name The name of the source.
* @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.
*

202
wp-includes/class-wp-block.php
View File

@ -191,6 +191,204 @@ class WP_Block {
return null;
}
/**
* Processes the block bindings in block's attributes.
*
* A block might contain bindings in its attributes. Bindings are mappings
* between an attribute of the block and a source. A "source" is a function
* registered with `register_block_bindings_source()` that defines how to
* retrieve a value from outside the block, e.g. from post meta.
*
* This function will process those bindings and replace the HTML with the value of the binding.
* The value is retrieved from the source of the binding.
*
* ### Example
*
* The "bindings" property for an Image block might look like this:
*
* ```json
* {
* "metadata": {
* "bindings": {
* "title": {
* "source": "post_meta",
* "args": { "key": "text_custom_field" }
* },
* "url": {
* "source": "post_meta",
* "args": { "key": "url_custom_field" }
* }
* }
* }
* }
* ```
*
* The above example will replace the `title` and `url` attributes of the Image
* block with the values of the `text_custom_field` and `url_custom_field` post meta.
*
* @access private
* @since 6.5.0
*
* @param string $block_content Block content.
* @param array $block The full block, including name and attributes.
*/
private function process_block_bindings( $block_content ) {
$block = $this->parsed_block;
// Allowed blocks that support block bindings.
// TODO: Look for a mechanism to opt-in for this. Maybe adding a property to block attributes?
$allowed_blocks = array(
'core/paragraph' => array( 'content' ),
'core/heading' => array( 'content' ),
'core/image' => array( 'url', 'title', 'alt' ),
'core/button' => array( 'url', 'text' ),
);
// If the block doesn't have the bindings property, isn't one of the allowed
// block types, or the bindings property is not an array, return the block content.
if ( ! isset( $block['attrs']['metadata']['bindings'] ) ||
! is_array( $block['attrs']['metadata']['bindings'] ) ||
! isset( $allowed_blocks[ $this->name ] )
) {
return $block_content;
}
$block_bindings_sources = get_all_registered_block_bindings_sources();
$modified_block_content = $block_content;
foreach ( $block['attrs']['metadata']['bindings'] as $binding_attribute => $binding_source ) {
// If the attribute is not in the list, process next attribute.
if ( ! in_array( $binding_attribute, $allowed_blocks[ $this->name ], true ) ) {
continue;
}
// If no source is provided, or that source is not registered, process next attribute.
if ( ! isset( $binding_source['source'] ) || ! is_string( $binding_source['source'] ) || ! isset( $block_bindings_sources[ $binding_source['source'] ] ) ) {
continue;
}
$source_callback = $block_bindings_sources[ $binding_source['source'] ]['get_value_callback'];
// Get the value based on the source.
if ( ! isset( $binding_source['args'] ) ) {
$source_args = array();
} else {
$source_args = $binding_source['args'];
}
$source_value = call_user_func_array( $source_callback, array( $source_args, $this, $binding_attribute ) );
// If the value is null, process next attribute.
if ( is_null( $source_value ) ) {
continue;
}
// Process the HTML based on the block and the attribute.
$modified_block_content = $this->replace_html( $modified_block_content, $this->name, $binding_attribute, $source_value );
}
return $modified_block_content;
}
/**
* Depending on the block attributes, replace the HTML based on the value returned by the source.
*
* @since 6.5.0
*
* @param string $block_content Block content.
* @param string $block_name The name of the block to process.
* @param string $block_attr The attribute of the block we want to process.
* @param string $source_value The value used to replace the HTML.
*/
private function replace_html( string $block_content, string $block_name, string $block_attr, string $source_value ) {
$block_type = $this->block_type;
if ( null === $block_type || ! isset( $block_type->attributes[ $block_attr ] ) ) {
return $block_content;
}
// Depending on the attribute source, the processing will be different.
switch ( $block_type->attributes[ $block_attr ]['source'] ) {
case 'html':
case 'rich-text':
$block_reader = new WP_HTML_Tag_Processor( $block_content );
// TODO: Support for CSS selectors whenever they are ready in the HTML API.
// In the meantime, support comma-separated selectors by exploding them into an array.
$selectors = explode( ',', $block_type->attributes[ $block_attr ]['selector'] );
// Add a bookmark to the first tag to be able to iterate over the selectors.
$block_reader->next_tag();
$block_reader->set_bookmark( 'iterate-selectors' );
// TODO: This shouldn't be needed when the `set_inner_html` function is ready.
// Store the parent tag and its attributes to be able to restore them later in the button.
// The button block has a wrapper while the paragraph and heading blocks don't.
if ( 'core/button' === $block_name ) {
$button_wrapper = $block_reader->get_tag();
$button_wrapper_attribute_names = $block_reader->get_attribute_names_with_prefix( '' );
$button_wrapper_attrs = array();
foreach ( $button_wrapper_attribute_names as $name ) {
$button_wrapper_attrs[ $name ] = $block_reader->get_attribute( $name );
}
}
foreach ( $selectors as $selector ) {
// If the parent tag, or any of its children, matches the selector, replace the HTML.
if ( strcasecmp( $block_reader->get_tag( $selector ), $selector ) === 0 || $block_reader->next_tag(
array(
'tag_name' => $selector,
)
) ) {
$block_reader->release_bookmark( 'iterate-selectors' );
// TODO: Use `set_inner_html` method whenever it's ready in the HTML API.
// Until then, it is hardcoded for the paragraph, heading, and button blocks.
// Store the tag and its attributes to be able to restore them later.
$selector_attribute_names = $block_reader->get_attribute_names_with_prefix( '' );
$selector_attrs = array();
foreach ( $selector_attribute_names as $name ) {
$selector_attrs[ $name ] = $block_reader->get_attribute( $name );
}
$selector_markup = "<$selector>" . wp_kses_post( $source_value ) . "</$selector>";
$amended_content = new WP_HTML_Tag_Processor( $selector_markup );
$amended_content->next_tag();
foreach ( $selector_attrs as $attribute_key => $attribute_value ) {
$amended_content->set_attribute( $attribute_key, $attribute_value );
}
if ( 'core/paragraph' === $block_name || 'core/heading' === $block_name ) {
return $amended_content->get_updated_html();
}
if ( 'core/button' === $block_name ) {
$button_markup = "<$button_wrapper>{$amended_content->get_updated_html()}</$button_wrapper>";
$amended_button = new WP_HTML_Tag_Processor( $button_markup );
$amended_button->next_tag();
foreach ( $button_wrapper_attrs as $attribute_key => $attribute_value ) {
$amended_button->set_attribute( $attribute_key, $attribute_value );
}
return $amended_button->get_updated_html();
}
} else {
$block_reader->seek( 'iterate-selectors' );
}
}
$block_reader->release_bookmark( 'iterate-selectors' );
return $block_content;
case 'attribute':
$amended_content = new WP_HTML_Tag_Processor( $block_content );
if ( ! $amended_content->next_tag(
array(
// TODO: build the query from CSS selector.
'tag_name' => $block_type->attributes[ $block_attr ]['selector'],
)
) ) {
return $block_content;
}
$amended_content->set_attribute( $block_type->attributes[ $block_attr ]['attribute'], esc_attr( $source_value ) );
return $amended_content->get_updated_html();
break;
default:
return $block_content;
break;
}
return;
}
/**
* Generates the render output for the block.
*
@ -286,6 +484,10 @@ class WP_Block {
}
}
// Process the block bindings for this block, if any are registered. This
// will replace the block content with the value from a registered binding source.
$block_content = $this->process_block_bindings( $block_content );
/**
* Filters the content of a single block.
*

2
wp-includes/version.php
View File

@ -16,7 +16,7 @@
*
* @global string $wp_version
*/
$wp_version = '6.5-alpha-57513';
$wp_version = '6.5-alpha-57514';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

2
wp-settings.php
View File

@ -376,6 +376,8 @@ require ABSPATH . WPINC . '/fonts/class-wp-font-face.php';
require ABSPATH . WPINC . '/fonts.php';
require ABSPATH . WPINC . '/class-wp-script-modules.php';
require ABSPATH . WPINC . '/script-modules.php';
require ABSPATH . WPINC . '/block-bindings/sources/post-meta.php';
require ABSPATH . WPINC . '/block-bindings/sources/pattern.php';
require ABSPATH . WPINC . '/interactivity-api.php';
wp_script_modules()->add_hooks();