1 files changed, 54 insertions, 0 deletions
diff --git a/wp-includes/blocks/pattern.php b/wp-includes/blocks/pattern.php
new file mode 100644
index 0000000..f05bb33
--- /dev/null
+++ b/wp-includes/blocks/pattern.php
@@ -0,0 +1,54 @@
+<?php
+/**
+ * Server-side rendering of the `core/pattern` block.
+ *
+ * @package WordPress
+ */
+
+/**
+ *  Registers the `core/pattern` block on the server.
+ */
+function register_block_core_pattern() {
+	register_block_type_from_metadata(
+		__DIR__ . '/pattern',
+		array(
+			'render_callback' => 'render_block_core_pattern',
+		)
+	);
+}
+
+/**
+ * Renders the `core/pattern` block on the server.
+ *
+ * @since 6.3.0 Backwards compatibility: blocks with no `syncStatus` attribute do not receive block wrapper.
+ *
+ * @param array $attributes Block attributes.
+ *
+ * @return string Returns the output of the pattern.
+ */
+function render_block_core_pattern( $attributes ) {
+	if ( empty( $attributes['slug'] ) ) {
+		return '';
+	}
+
+	$slug     = $attributes['slug'];
+	$registry = WP_Block_Patterns_Registry::get_instance();
+
+	if ( ! $registry->is_registered( $slug ) ) {
+		return '';
+	}
+
+	$pattern = $registry->get_registered( $slug );
+	$content = $pattern['content'];
+
+	// Backward compatibility for handling Block Hooks and injecting the theme attribute in the Gutenberg plugin.
+	// This can be removed when the minimum supported WordPress is >= 6.4.
+	if ( defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN && ! function_exists( 'traverse_and_serialize_blocks' ) ) {
+		$blocks  = parse_blocks( $content );
+		$content = gutenberg_serialize_blocks( $blocks );
+	}
+
+	return do_blocks( $content );
+}
+
+add_action( 'init', 'register_block_core_pattern' );