Bail early for given origin

lib/compat/wordpress-6.2/class-wp-theme-json-resolver-6-2.php

@@ -57,4 +57,62 @@ public static function _clean_cached_data_upon_upgrading( $upgrader, $options )
 		}
 	}
 
+	/**
+	 * Returns the data merged from multiple origins.
+	 *
+	 * There are four sources of data (origins) for a site:
+	 *
+	 * - default => WordPress
+	 * - blocks  => each one of the blocks provides data for itself
+	 * - theme   => the active theme
+	 * - custom  => data provided by the user
+	 *
+	 * The custom's has higher priority than the theme's, the theme's higher than blocks',
+	 * and block's higher than default's.
+	 *
+	 * Unlike the getters
+	 * {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_core_data/ get_core_data},
+	 * {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_theme_data/ get_theme_data},
+	 * and {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_user_data/ get_user_data},
+	 * this method returns data after it has been merged with the previous origins.
+	 * This means that if the same piece of data is declared in different origins
+	 * (default, blocks, theme, custom), the last origin overrides the previous.
+	 *
+	 * For example, if the user has set a background color
+	 * for the paragraph block, and the theme has done it as well,
+	 * the user preference wins.
+	 *
+	 * @param string $origin Optional. To what level should we merge data:'default', 'blocks', 'theme' or 'custom'.
+	 *                       'custom' is used as default value as well as fallback value if the origin is unknown.
+	 *
+	 * @return WP_Theme_JSON
+	 */
+	public static function get_merged_data( $origin = 'custom' ) {
+		if ( is_array( $origin ) ) {
+			_deprecated_argument( __FUNCTION__, '5.9.0' );
+		}
+
+		$result = static::get_core_data();
+		if ( 'default' === $origin ) {
+			$result->set_spacing_sizes();
+			return $result;
+		}
+
+		$result->merge( static::get_block_data() );
+		if ( 'blocks' === $origin ) {
+			$result->set_spacing_sizes();
+			return $result;
+		}
+
+		$result->merge( static::get_theme_data() );
+		if ( 'theme' === $origin ) {
+			$result->set_spacing_sizes();
+			return $result;
+		}
+
+		$result->merge( static::get_user_data() );
+
+		$result->set_spacing_sizes();
+		return $result;
+	}
 }