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<?php
/**
* Server-side rendering of the `core/file` block.
*
* @package WordPress
*/
/**
* When the `core/file` block is rendering, check if we need to enqueue the `wp-block-file-view` script.
*
* @param array $attributes The block attributes.
* @param string $content The block content.
* @param WP_Block $block The parsed block.
*
* @return string Returns the block content.
*/
function render_block_core_file( $attributes, $content, $block ) {
$should_load_view_script = ! empty( $attributes['displayPreview'] );
$view_js_file = 'wp-block-file-view';
// If the script already exists, there is no point in removing it from viewScript.
if ( ! wp_script_is( $view_js_file ) ) {
$script_handles = $block->block_type->view_script_handles;
// If the script is not needed, and it is still in the `view_script_handles`, remove it.
if ( ! $should_load_view_script && in_array( $view_js_file, $script_handles, true ) ) {
$block->block_type->view_script_handles = array_diff( $script_handles, array( $view_js_file ) );
}
// If the script is needed, but it was previously removed, add it again.
if ( $should_load_view_script && ! in_array( $view_js_file, $script_handles, true ) ) {
$block->block_type->view_script_handles = array_merge( $script_handles, array( $view_js_file ) );
}
}
// Update object's aria-label attribute if present in block HTML.
// Match an aria-label attribute from an object tag.
$pattern = '@<object.+(?<attribute>aria-label="(?<filename>[^"]+)?")@i';
$content = preg_replace_callback(
$pattern,
static function ( $matches ) {
$filename = ! empty( $matches['filename'] ) ? $matches['filename'] : '';
$has_filename = ! empty( $filename ) && 'PDF embed' !== $filename;
$label = $has_filename ?
sprintf(
/* translators: %s: filename. */
__( 'Embed of %s.' ),
$filename
)
: __( 'PDF embed' );
return str_replace( $matches['attribute'], sprintf( 'aria-label="%s"', $label ), $matches[0] );
},
$content
);
// If it uses the Interactivity API, add the directives.
if ( $should_load_view_script ) {
$processor = new WP_HTML_Tag_Processor( $content );
$processor->next_tag();
$processor->set_attribute( 'data-wp-interactive', '' );
$processor->next_tag( 'object' );
$processor->set_attribute( 'data-wp-bind--hidden', '!selectors.core.file.hasPdfPreview' );
$processor->set_attribute( 'hidden', true );
return $processor->get_updated_html();
}
return $content;
}
/**
* Ensure that the view script has the `wp-interactivity` dependency.
*
* @since 6.4.0
*
* @global WP_Scripts $wp_scripts
*/
function block_core_file_ensure_interactivity_dependency() {
global $wp_scripts;
if (
isset( $wp_scripts->registered['wp-block-file-view'] ) &&
! in_array( 'wp-interactivity', $wp_scripts->registered['wp-block-file-view']->deps, true )
) {
$wp_scripts->registered['wp-block-file-view']->deps[] = 'wp-interactivity';
}
}
add_action( 'wp_print_scripts', 'block_core_file_ensure_interactivity_dependency' );
/**
* Registers the `core/file` block on server.
*/
function register_block_core_file() {
register_block_type_from_metadata(
__DIR__ . '/file',
array(
'render_callback' => 'render_block_core_file',
)
);
}
add_action( 'init', 'register_block_core_file' );
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