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- <?php
- /**
- * Server-side rendering of the `core/gallery` block.
- *
- * @package WordPress
- */
- /**
- * Handles backwards compatibility for Gallery Blocks,
- * whose images feature a `data-id` attribute.
- *
- * Now that the Gallery Block contains inner Image Blocks,
- * we add a custom `data-id` attribute before rendering the gallery
- * so that the Image Block can pick it up in its render_callback.
- *
- * @param array $parsed_block The block being rendered.
- * @return array The migrated block object.
- */
- function block_core_gallery_data_id_backcompatibility( $parsed_block ) {
- if ( 'core/gallery' === $parsed_block['blockName'] ) {
- foreach ( $parsed_block['innerBlocks'] as $key => $inner_block ) {
- if ( 'core/image' === $inner_block['blockName'] ) {
- if ( ! isset( $parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] ) && isset( $inner_block['attrs']['id'] ) ) {
- $parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] = esc_attr( $inner_block['attrs']['id'] );
- }
- }
- }
- }
- return $parsed_block;
- }
- add_filter( 'render_block_data', 'block_core_gallery_data_id_backcompatibility' );
- /**
- * Adds a style tag for the --wp--style--unstable-gallery-gap var.
- *
- * The Gallery block needs to recalculate Image block width based on
- * the current gap setting in order to maintain the number of flex columns
- * so a css var is added to allow this.
- *
- * @param array $attributes Attributes of the block being rendered.
- * @param string $content Content of the block being rendered.
- * @return string The content of the block being rendered.
- */
- function block_core_gallery_render( $attributes, $content ) {
- $gap = _wp_array_get( $attributes, array( 'style', 'spacing', 'blockGap' ) );
- // Skip if gap value contains unsupported characters.
- // Regex for CSS value borrowed from `safecss_filter_attr`, and used here
- // because we only want to match against the value, not the CSS attribute.
- if ( is_array( $gap ) ) {
- foreach ( $gap as $key => $value ) {
- // Make sure $value is a string to avoid PHP 8.1 deprecation error in preg_match() when the value is null.
- $value = is_string( $value ) ? $value : '';
- $value = $value && preg_match( '%[\\\(&=}]|/\*%', $value ) ? null : $value;
- // Get spacing CSS variable from preset value if provided.
- if ( is_string( $value ) && str_contains( $value, 'var:preset|spacing|' ) ) {
- $index_to_splice = strrpos( $value, '|' ) + 1;
- $slug = _wp_to_kebab_case( substr( $value, $index_to_splice ) );
- $value = "var(--wp--preset--spacing--$slug)";
- }
- $gap[ $key ] = $value;
- }
- } else {
- // Make sure $gap is a string to avoid PHP 8.1 deprecation error in preg_match() when the value is null.
- $gap = is_string( $gap ) ? $gap : '';
- $gap = $gap && preg_match( '%[\\\(&=}]|/\*%', $gap ) ? null : $gap;
- // Get spacing CSS variable from preset value if provided.
- if ( is_string( $gap ) && str_contains( $gap, 'var:preset|spacing|' ) ) {
- $index_to_splice = strrpos( $gap, '|' ) + 1;
- $slug = _wp_to_kebab_case( substr( $gap, $index_to_splice ) );
- $gap = "var(--wp--preset--spacing--$slug)";
- }
- }
- $class = wp_unique_id( 'wp-block-gallery-' );
- $content = preg_replace(
- '/' . preg_quote( 'class="', '/' ) . '/',
- 'class="' . $class . ' ',
- $content,
- 1
- );
- // --gallery-block--gutter-size is deprecated. --wp--style--gallery-gap-default should be used by themes that want to set a default
- // gap on the gallery.
- $fallback_gap = 'var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) )';
- $gap_value = $gap ? $gap : $fallback_gap;
- $gap_column = $gap_value;
- if ( is_array( $gap_value ) ) {
- $gap_row = isset( $gap_value['top'] ) ? $gap_value['top'] : $fallback_gap;
- $gap_column = isset( $gap_value['left'] ) ? $gap_value['left'] : $fallback_gap;
- $gap_value = $gap_row === $gap_column ? $gap_row : $gap_row . ' ' . $gap_column;
- }
- // The unstable gallery gap calculation requires a real value (such as `0px`) and not `0`.
- if ( '0' === $gap_column ) {
- $gap_column = '0px';
- }
- // Set the CSS variable to the column value, and the `gap` property to the combined gap value.
- $style = '.wp-block-gallery.' . $class . '{ --wp--style--unstable-gallery-gap: ' . $gap_column . '; gap: ' . $gap_value . '}';
- wp_enqueue_block_support_styles( $style, 11 );
- return $content;
- }
- /**
- * Registers the `core/gallery` block on server.
- */
- function register_block_core_gallery() {
- register_block_type_from_metadata(
- __DIR__ . '/gallery',
- array(
- 'render_callback' => 'block_core_gallery_render',
- )
- );
- }
- add_action( 'init', 'register_block_core_gallery' );
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