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<?php /** * Server-side rendering of the `core/footnotes` block. * * @package WordPress */ /** * Renders the `core/footnotes` block on the server. * * @since 6.3.0 * * @param array $attributes Block attributes. * @param string $content Block default content. * @param WP_Block $block Block instance. * * @return string Returns the HTML representing the footnotes. */ function render_block_core_footnotes( $attributes, $content, $block ) { // Bail out early if the post ID is not set for some reason. if ( empty( $block->context['postId'] ) ) { return ''; } if ( post_password_required( $block->context['postId'] ) ) { return; } $footnotes = get_post_meta( $block->context['postId'], 'footnotes', true ); if ( ! $footnotes ) { return; } $footnotes = json_decode( $footnotes, true ); if ( ! is_array( $footnotes ) || count( $footnotes ) === 0 ) { return ''; } $wrapper_attributes = get_block_wrapper_attributes(); $footnote_index = 1; $block_content = ''; foreach ( $footnotes as $footnote ) { // Translators: %d: Integer representing the number of return links on the page. $aria_label = sprintf( __( 'Jump to footnote reference %1$d' ), $footnote_index ); $block_content .= sprintf( '<li id="%1$s">%2$s <a href="#%1$s-link" aria-label="%3$s">↩︎</a></li>', $footnote['id'], $footnote['content'], $aria_label ); ++$footnote_index; } return sprintf( '<ol %1$s>%2$s</ol>', $wrapper_attributes, $block_content ); } /** * Registers the `core/footnotes` block on the server. * * @since 6.3.0 */ function register_block_core_footnotes() { register_block_type_from_metadata( __DIR__ . '/footnotes', array( 'render_callback' => 'render_block_core_footnotes', ) ); } add_action( 'init', 'register_block_core_footnotes' ); /** * Registers the footnotes meta field required for footnotes to work. * * @since 6.5.0 */ function register_block_core_footnotes_post_meta() { $post_types = get_post_types( array( 'show_in_rest' => true ) ); foreach ( $post_types as $post_type ) { // Only register the meta field if the post type supports the editor, custom fields, and revisions. if ( post_type_supports( $post_type, 'editor' ) && post_type_supports( $post_type, 'custom-fields' ) && post_type_supports( $post_type, 'revisions' ) ) { register_post_meta( $post_type, 'footnotes', array( 'show_in_rest' => true, 'single' => true, 'type' => 'string', 'revisions_enabled' => true, ) ); } } } /* * Most post types are registered at priority 10, so use priority 20 here in * order to catch them. */ add_action( 'init', 'register_block_core_footnotes_post_meta', 20 ); /** * Adds the footnotes field to the revisions display. * * @since 6.3.0 * * @param array $fields The revision fields. * @return array The revision fields. */ function wp_add_footnotes_to_revision( $fields ) { $fields['footnotes'] = __( 'Footnotes' ); return $fields; } add_filter( '_wp_post_revision_fields', 'wp_add_footnotes_to_revision' ); /** * Gets the footnotes field from the revision for the revisions screen. * * @since 6.3.0 * * @param string $revision_field The field value, but $revision->$field * (footnotes) does not exist. * @param string $field The field name, in this case "footnotes". * @param object $revision The revision object to compare against. * @return string The field value. */ function wp_get_footnotes_from_revision( $revision_field, $field, $revision ) { return get_metadata( 'post', $revision->ID, $field, true ); } add_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision', 10, 3 );
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