ime that
* the property is accessed. For all other inaccessible properties, a `null`
* value is returned.
*
* @since 5.5.0
*
* @param string $name Property name.
* @return array|null Prepared attributes, or null.
*/
public function __get( $name ) {
if ( 'attributes' === $name ) {
$this->attributes = isset( $this->parsed_block['attrs'] ) ?
$this->parsed_block['attrs'] :
array();
if ( ! is_null( $this->block_type ) ) {
$this->attributes = $this->block_type->prepare_attributes_for_render( $this->attributes );
}
return $this->attributes;
}
return null;
}
/**
* Processes the block bindings and updates the block attributes with the values from the sources.
*
* 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 update the block's attributes
* with the values coming from the bindings.
*
* ### Example
*
* The "bindings" property for an Image block might look like this:
*
* ```json
* {
* "metadata": {
* "bindings": {
* "title": {
* "source": "core/post-meta",
* "args": { "key": "text_custom_field" }
* },
* "url": {
* "source": "core/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.
*
* @since 6.5.0
*
* @return array The computed block attributes for the provided block bindings.
*/
private function process_block_bindings() {
$parsed_block = $this->parsed_block;
$computed_attributes = array();
$supported_block_attributes = array(
'core/paragraph' => array( 'content' ),
'core/heading' => array( 'content' ),
'core/image' => array( 'id', 'url', 'title', 'alt' ),
'core/button' => array( 'url', 'text', 'linkTarget', 'rel' ),
);
// If the block doesn't have the bindings property, isn't one of the supported
// block types, or the bindings property is not an array, return the block content.
if (
! isset( $supported_block_attributes[ $this->name ] ) ||
empty( $parsed_block['attrs']['metadata']['bindings'] ) ||
! is_array( $parsed_block['attrs']['metadata']['bindings'] )
) {
return $computed_attributes;
}
foreach ( $parsed_block['attrs']['metadata']['bindings'] as $attribute_name => $block_binding ) {
// If the attribute is not in the supported list, process next attribute.
if ( ! in_array( $attribute_name, $supported_block_attributes[ $this->name ], true ) ) {
continue;
}
// If no source is provided, or that source is not registered, process next attribute.
if ( ! isset( $block_binding['source'] ) || ! is_string( $block_binding['source'] ) ) {
continue;
}
$block_binding_source = get_block_bindings_source( $block_binding['source'] );
if ( null === $block_binding_source ) {
continue;
}
$source_args = ! empty( $block_binding['args'] ) && is_array( $block_binding['args'] ) ? $block_binding['args'] : array();
$source_value = $block_binding_source->get_value( $source_args, $this, $attribute_name );
// If the value is not null, process the HTML based on the block and the attribute.
if ( ! is_null( $source_value ) ) {
$computed_attributes[ $attribute_name ] = $source_value;
}
}
return $computed_attributes;
}
/**
* Depending on the block attribute name, replace its value in the HTML based on the value provided.
*
* @since 6.5.0
*
* @param string $block_content Block content.
* @param string $attribute_name The attribute name to replace.
* @param mixed $source_value The value used to replace in the HTML.
* @return string The modified block content.
*/
private function replace_html( string $block_content, string $attribute_name, $source_value ) {
$block_type = $this->block_type;
if ( ! isset( $block_type->attributes[ $attribute_name ]['source'] ) ) {
return $block_content;
}
// Depending on the attribute source, the processing will be different.
switch ( $block_type->attributes[ $attribute_name ]['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[ $attribute_name ]['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' === $this->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 ) . "";
$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' === $this->name || 'core/heading' === $this->name ) {
return $amended_content->get_updated_html();
}
if ( 'core/button' === $this->name ) {
$button_markup = "<$button_wrapper>{$amended_content->get_updated_html()}";
$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[ $attribute_name ]['selector'],
)
) ) {
return $block_content;
}
$amended_content->set_attribute( $block_type->attributes[ $attribute_name ]['attribute'], $source_value );
return $amended_content->get_updated_html();
break;
default:
return $block_content;
break;
}
return;
}
/**
* Generates the render output for the block.
*
* @since 5.5.0
* @since 6.5.0 Added block bindings processing.
*
* @global WP_Post $post Global post object.
*
* @param array $options {
* Optional options object.
*
* @type bool $dynamic Defaults to 'true'. Optionally set to false to avoid using the block's render_callback.
* }
* @return string Rendered block output.
*/
public function render( $options = array() ) {
global $post;
$options = wp_parse_args(
$options,
array(
'dynamic' => true,
)
);
// Process the block bindings and get attributes updated with the values from the sources.
$computed_attributes = $this->process_block_bindings();
if ( ! empty( $computed_attributes ) ) {
// Merge the computed attributes with the original attributes.
$this->attributes = array_merge( $this->attributes, $computed_attributes );
}
$is_dynamic = $options['dynamic'] && $this->name && null !== $this->block_type && $this->block_type->is_dynamic();
$block_content = '';
if ( ! $options['dynamic'] || empty( $this->block_type->skip_inner_blocks ) ) {
$index = 0;
foreach ( $this->inner_content as $chunk ) {
if ( is_string( $chunk ) ) {
$block_content .= $chunk;
} else {
$inner_block = $this->inner_blocks[ $index ];
$parent_block = $this;
/** This filter is documented in wp-includes/blocks.php */
$pre_render = apply_filters( 'pre_render_block', null, $inner_block->parsed_block, $parent_block );
if ( ! is_null( $pre_render ) ) {
$block_content .= $pre_render;
} else {
$source_block = $inner_block->parsed_block;
/** This filter is documented in wp-includes/blocks.php */
$inner_block->parsed_block = apply_filters( 'render_block_data', $inner_block->parsed_block, $source_block, $parent_block );
/** This filter is documented in wp-includes/blocks.php */
$inner_block->context = apply_filters( 'render_block_context', $inner_block->context, $inner_block->parsed_block, $parent_block );
$block_content .= $inner_block->render();
}
++$index;
}
}
}
if ( ! empty( $computed_attributes ) && ! empty( $block_content ) ) {
foreach ( $computed_attributes as $attribute_name => $source_value ) {
$block_content = $this->replace_html( $block_content, $attribute_name, $source_value );
}
}
if ( $is_dynamic ) {
$global_post = $post;
$parent = WP_Block_Supports::$block_to_render;
WP_Block_Supports::$block_to_render = $this->parsed_block;
$block_content = (string) call_user_func( $this->block_type->render_callback, $this->attributes, $block_content, $this );
WP_Block_Supports::$block_to_render = $parent;
$post = $global_post;
}
if ( ( ! empty( $this->block_type->script_handles ) ) ) {
foreach ( $this->block_type->script_handles as $script_handle ) {
wp_enqueue_script( $script_handle );
}
}
if ( ! empty( $this->block_type->view_script_handles ) ) {
foreach ( $this->block_type->view_script_handles as $view_script_handle ) {
wp_enqueue_script( $view_script_handle );
}
}
if ( ! empty( $this->block_type->view_script_module_ids ) ) {
foreach ( $this->block_type->view_script_module_ids as $view_script_module_id ) {
wp_enqueue_script_module( $view_script_module_id );
}
}
if ( ( ! empty( $this->block_type->style_handles ) ) ) {
foreach ( $this->block_type->style_handles as $style_handle ) {
wp_enqueue_style( $style_handle );
}
}
if ( ( ! empty( $this->block_type->view_style_handles ) ) ) {
foreach ( $this->block_type->view_style_handles as $view_style_handle ) {
wp_enqueue_style( $view_style_handle );
}
}
/**
* Filters the content of a single block.
*
* @since 5.0.0
* @since 5.9.0 The `$instance` parameter was added.
*
* @param string $block_content The block content.
* @param array $block The full block, including name and attributes.
* @param WP_Block $instance The block instance.
*/
$block_content = apply_filters( 'render_block', $block_content, $this->parsed_block, $this );
/**
* Filters the content of a single block.
*
* The dynamic portion of the hook name, `$name`, refers to
* the block name, e.g. "core/paragraph".
*
* @since 5.7.0
* @since 5.9.0 The `$instance` parameter was added.
*
* @param string $block_content The block content.
* @param array $block The full block, including name and attributes.
* @param WP_Block $instance The block instance.
*/
$block_content = apply_filters( "render_block_{$this->name}", $block_content, $this->parsed_block, $this );
return $block_content;
}
}
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