Add Enqueued_Styles_Size_Check

includes/Checker/Checks/Enqueued_Scripts_Size_Check.php

@@ -236,7 +236,8 @@ protected function check_url( Check_Result $result, $url ) {
 				$this->add_result_warning_for_file(
 					$result,
 					sprintf(
-						'This script has a size of %1$s which in combination with the other scripts enqueued on %2$s exceeds the script size threshold of %3$s.',
+						/* translators: 1: style file size. 2: tested URL. 3: threshold file size. */
+						__( 'This script has a size of %1$s which in combination with the other scripts enqueued on %2$s exceeds the script size threshold of %3$s.', 'plugin-check' ),
 						size_format( $plugin_script['size'] ),
 						$url,
 						size_format( $this->threshold_size )

includes/Checker/Checks/Enqueued_Styles_Size_Check.php

@@ -0,0 +1,266 @@
+<?php
+/**
+ * Class WordPress\Plugin_Check\Checker\Checks\Enqueued_Styles_Size_Check
+ *
+ * @package plugin-check
+ */
+
+namespace WordPress\Plugin_Check\Checker\Checks;
+
+use Exception;
+use WordPress\Plugin_Check\Checker\Check_Categories;
+use WordPress\Plugin_Check\Checker\Check_Result;
+use WordPress\Plugin_Check\Checker\Preparations\Demo_Posts_Creation_Preparation;
+use WordPress\Plugin_Check\Checker\With_Shared_Preparations;
+use WordPress\Plugin_Check\Traits\Amend_Check_Result;
+use WordPress\Plugin_Check\Traits\Stable_Check;
+use WordPress\Plugin_Check\Traits\URL_Aware;
+
+/**
+ * Check for enqueued style sizes.
+ *
+ * @since 1.0.2
+ */
+class Enqueued_Styles_Size_Check extends Abstract_Runtime_Check implements With_Shared_Preparations {
+
+	use Amend_Check_Result;
+	use Stable_Check;
+	use URL_Aware;
+
+	/**
+	 * Threshold for style size to surface a warning for.
+	 *
+	 * @since 1.0.2
+	 * @var int
+	 */
+	private $threshold_size;
+
+	/**
+	 * List of viewable post types.
+	 *
+	 * @since 1.0.2
+	 * @var array
+	 */
+	private $viewable_post_types;
+
+	/**
+	 * Set the threshold size for style sizes to surface warnings.
+	 *
+	 * @since 1.0.2
+	 *
+	 * @param int $threshold_size The threshold in bytes for style size to surface warnings.
+	 */
+	public function __construct( $threshold_size = 300000 ) {
+		$this->threshold_size = $threshold_size;
+	}
+
+	/**
+	 * Gets the categories for the check.
+	 *
+	 * Every check must have at least one category.
+	 *
+	 * @since 1.0.2
+	 *
+	 * @return array The categories for the check.
+	 */
+	public function get_categories() {
+		return array( Check_Categories::CATEGORY_PERFORMANCE );
+	}
+
+	/**
+	 * Runs this preparation step for the environment and returns a cleanup function.
+	 *
+	 * @since 1.0.2
+	 *
+	 * @return callable Cleanup function to revert any changes made here.
+	 *
+	 * @throws Exception Thrown when preparation fails.
+	 */
+	public function prepare() {
+		$orig_styles = isset( $GLOBALS['wp_styles'] ) ? $GLOBALS['wp_styles'] : null;
+
+		// Backup the original values for the global state.
+		$this->backup_globals();
+
+		return function () use ( $orig_styles ) {
+			if ( is_null( $orig_styles ) ) {
+				unset( $GLOBALS['wp_styles'] );
+			} else {
+				$GLOBALS['wp_styles'] = $orig_styles;
+			}
+
+			$this->restore_globals();
+		};
+	}
+
+	/**
+	 * Returns an array of shared preparations for the check.
+	 *
+	 * @since 1.0.2
+	 *
+	 * @return array Returns a map of $class_name => $constructor_args pairs. If the class does not
+	 *               need any constructor arguments, it would just be an empty array.
+	 */
+	public function get_shared_preparations() {
+		$demo_posts = array_map(
+			static function ( $post_type ) {
+				return array(
+					'post_title'   => "Demo {$post_type} post",
+					'post_content' => 'Test content',
+					'post_type'    => $post_type,
+					'post_status'  => 'publish',
+				);
+			},
+			$this->get_viewable_post_types()
+		);
+
+		return array(
+			Demo_Posts_Creation_Preparation::class => array( $demo_posts ),
+		);
+	}
+
+	/**
+	 * Runs the check on the plugin and amends results.
+	 *
+	 * @since 1.0.2
+	 *
+	 * @param Check_Result $result The check results to amend and the plugin context.
+	 */
+	public function run( Check_Result $result ) {
+		$this->run_for_urls(
+			$this->get_urls(),
+			function ( $url ) use ( $result ) {
+				$this->check_url( $result, $url );
+			}
+		);
+	}
+
+	/**
+	 * Gets the list of URLs to run this check for.
+	 *
+	 * @since 1.0.2
+	 *
+	 * @return array List of URL strings (either full URLs or paths).
+	 *
+	 * @throws Exception Thrown when a post type URL cannot be retrieved.
+	 */
+	protected function get_urls() {
+		$urls = array( home_url() );
+
+		foreach ( $this->get_viewable_post_types() as $post_type ) {
+			$posts = get_posts(
+				array(
+					'posts_per_page' => 1,
+					'post_type'      => $post_type,
+					'post_status'    => array( 'publish', 'inherit' ),
+				)
+			);
+
+			if ( ! isset( $posts[0] ) ) {
+				throw new Exception(
+					sprintf(
+						/* translators: %s: The Post Type name. */
+						__( 'Unable to retrieve post URL for post type: %s', 'plugin-check' ),
+						$post_type
+					)
+				);
+			}
+
+			$urls[] = get_permalink( $posts[0] );
+		}
+
+		return $urls;
+	}
+
+	/**
+	 * Amends the given result by running the check for the given URL.
+	 *
+	 * @since 1.0.2
+	 *
+	 * @param Check_Result $result The check result to amend, including the plugin context to check.
+	 * @param string       $url    URL to run the check for.
+	 *
+	 * @throws Exception Thrown when the check fails with a critical error (unrelated to any errors detected as part of
+	 *                   the check).
+	 *
+	 * @SuppressWarnings(PHPMD.NPathComplexity)
+	 */
+	protected function check_url( Check_Result $result, $url ) {
+		// Reset the WP_Styles instance.
+		unset( $GLOBALS['wp_styles'] );
+
+		// Run enqueue functions wrapped in an output buffer in case of any callbacks printing styles
+		// directly. This is discouraged, but some plugins or themes are still doing it.
+		ob_start();
+		wp_enqueue_scripts();
+		wp_styles()->do_items();
+		wp_styles()->do_footer_items();
+		ob_get_clean();
+
+		$plugin_styles     = array();
+		$plugin_style_size = 0;
+
+		foreach ( wp_styles()->done as $handle ) {
+			$style = wp_styles()->registered[ $handle ];
+
+			if ( ! $style->src || strpos( $style->src, $result->plugin()->url() ) !== 0 ) {
+				continue;
+			}
+
+			// Get size of style src.
+			$style_path = str_replace( $result->plugin()->url(), $result->plugin()->path(), $style->src );
+			$style_size = function_exists( 'wp_filesize' ) ? wp_filesize( $style_path ) : filesize( $style_path );
+
+			// Get size of additional inline styles.
+			if ( ! empty( $style->extra['after'] ) ) {
+				foreach ( $style->extra['after'] as $extra ) {
+					$style_size += ( is_string( $extra ) ) ? mb_strlen( $extra, '8bit' ) : 0;
+				}
+			}
+
+			if ( ! empty( $style->extra['before'] ) ) {
+				foreach ( $style->extra['before'] as $extra ) {
+					$style_size += ( is_string( $extra ) ) ? mb_strlen( $extra, '8bit' ) : 0;
+				}
+			}
+
+			$plugin_styles[]    = array(
+				'path' => $style_path,
+				'size' => $style_size,
+			);
+			$plugin_style_size += $style_size;
+		}
+
+		if ( $plugin_style_size > $this->threshold_size ) {
+			foreach ( $plugin_styles as $plugin_style ) {
+				$this->add_result_warning_for_file(
+					$result,
+					sprintf(
+						/* translators: 1: style file size. 2: tested URL. 3: threshold file size. */
+						__( 'This style has a size of %1$s which in combination with the other styles enqueued on %2$s exceeds the style size threshold of %3$s.', 'plugin-check' ),
+						size_format( $plugin_style['size'] ),
+						$url,
+						size_format( $this->threshold_size )
+					),
+					'EnqueuedStylesSize.StyleSizeGreaterThanThreshold',
+					$plugin_style['path']
+				);
+			}
+		}
+	}
+
+	/**
+	 * Returns an array of viewable post types.
+	 *
+	 * @since 1.0.2
+	 *
+	 * @return array Array of viewable post type slugs.
+	 */
+	private function get_viewable_post_types() {
+		if ( ! is_array( $this->viewable_post_types ) ) {
+			$this->viewable_post_types = array_filter( get_post_types(), 'is_post_type_viewable' );
+		}
+
+		return $this->viewable_post_types;
+	}
+}

includes/Checker/Default_Check_Repository.php

@@ -41,6 +41,7 @@ private function register_default_checks() {
 			array(
 				'i18n_usage'                 => new Checks\I18n_Usage_Check(),
 				'enqueued_scripts_size'      => new Checks\Enqueued_Scripts_Size_Check(),
+				'enqueued_styles_size'       => new Checks\Enqueued_Styles_Size_Check(),
 				'code_obfuscation'           => new Checks\Code_Obfuscation_Check(),
 				'file_type'                  => new Checks\File_Type_Check(),
 				'plugin_header_text_domain'  => new Checks\Plugin_Header_Text_Domain_Check(),

tests/phpunit/testdata/plugins/test-plugin-enqueued-style-size-check/load.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ * File contains errors for the enqueued style sizes check.
+ */
+
+add_action(
+	'wp_enqueue_scripts',
+	function() {
+		// Style size is 33 bytes.
+		wp_enqueue_style(
+			'plugin_check_test_style',
+			plugin_dir_url( __FILE__ ) . 'test-style.css'
+		);
+
+		wp_add_inline_style(
+			'plugin_check_test_style',
+			'*{outline:none;}'
+		);
+	}
+);
+

tests/phpunit/testdata/plugins/test-plugin-enqueued-style-size-check/test-style.css

@@ -0,0 +1 @@
+a { text-decoration: underline; }