<?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.
*
* @return string Returns the block content.
*/
function render_block_core_file( $attributes, $content ) {
$should_load_view_script = ! empty( $attributes['displayPreview'] ) && ! wp_script_is( 'wp-block-file-view' );
if ( $should_load_view_script ) {
wp_enqueue_script( 'wp-block-file-view' );
}
// 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,
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
);
return $content;
}
/**
* 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' );