first commit

wp-includes/blocks/block.php

@@ -0,0 +1,107 @@
+<?php
+/**
+ * Server-side rendering of the `core/block` block.
+ *
+ * @package WordPress
+ */
+
+/**
+ * Renders the `core/block` block on server.
+ *
+ * @param array $attributes The block attributes.
+ *
+ * @return string Rendered HTML of the referenced block.
+ */
+function render_block_core_block( $attributes ) {
+	static $seen_refs = array();
+
+	if ( empty( $attributes['ref'] ) ) {
+		return '';
+	}
+
+	$reusable_block = get_post( $attributes['ref'] );
+	if ( ! $reusable_block || 'wp_block' !== $reusable_block->post_type ) {
+		return '';
+	}
+
+	if ( isset( $seen_refs[ $attributes['ref'] ] ) ) {
+		// WP_DEBUG_DISPLAY must only be honored when WP_DEBUG. This precedent
+		// is set in `wp_debug_mode()`.
+		$is_debug = WP_DEBUG && WP_DEBUG_DISPLAY;
+
+		return $is_debug ?
+			// translators: Visible only in the front end, this warning takes the place of a faulty block.
+			__( '[block rendering halted]' ) :
+			'';
+	}
+
+	if ( 'publish' !== $reusable_block->post_status || ! empty( $reusable_block->post_password ) ) {
+		return '';
+	}
+
+	$seen_refs[ $attributes['ref'] ] = true;
+
+	// Handle embeds for reusable blocks.
+	global $wp_embed;
+	$content = $wp_embed->run_shortcode( $reusable_block->post_content );
+	$content = $wp_embed->autoembed( $content );
+
+	// Back compat.
+	// For blocks that have not been migrated in the editor, add some back compat
+	// so that front-end rendering continues to work.
+
+	// This matches the `v2` deprecation. Removes the inner `values` property
+	// from every item.
+	if ( isset( $attributes['content'] ) ) {
+		foreach ( $attributes['content'] as &$content_data ) {
+			if ( isset( $content_data['values'] ) ) {
+				$is_assoc_array = is_array( $content_data['values'] ) && ! wp_is_numeric_array( $content_data['values'] );
+
+				if ( $is_assoc_array ) {
+					$content_data = $content_data['values'];
+				}
+			}
+		}
+	}
+
+	// This matches the `v1` deprecation. Rename `overrides` to `content`.
+	if ( isset( $attributes['overrides'] ) && ! isset( $attributes['content'] ) ) {
+		$attributes['content'] = $attributes['overrides'];
+	}
+
+	/**
+	 * We set the `pattern/overrides` context through the `render_block_context`
+	 * filter so that it is available when a pattern's inner blocks are
+	 * rendering via do_blocks given it only receives the inner content.
+	 */
+	$has_pattern_overrides = isset( $attributes['content'] );
+	if ( $has_pattern_overrides ) {
+		$filter_block_context = static function ( $context ) use ( $attributes ) {
+			$context['pattern/overrides'] = $attributes['content'];
+			return $context;
+		};
+		add_filter( 'render_block_context', $filter_block_context, 1 );
+	}
+
+	$content = do_blocks( $content );
+	unset( $seen_refs[ $attributes['ref'] ] );
+
+	if ( $has_pattern_overrides ) {
+		remove_filter( 'render_block_context', $filter_block_context, 1 );
+	}
+
+	return $content;
+}
+
+/**
+ * Registers the `core/block` block.
+ */
+function register_block_core_block() {
+	register_block_type_from_metadata(
+		__DIR__ . '/block',
+		array(
+			'render_callback' => 'render_block_core_block',
+		)
+	);
+}
+add_action( 'init', 'register_block_core_block' );