Revert "Issue #2188661 by sun, Berdir: Extension System, Part II: ExtensionDiscovery."

This reverts commit ae8be3cc.

core/includes/bootstrap.inc

@@ -10,7 +10,6 @@
 use Drupal\Core\DrupalKernel;
 use Drupal\Core\Database\Database;
 use Drupal\Core\DependencyInjection\ContainerBuilder;
-use Drupal\Core\Extension\ExtensionDiscovery;
 use Drupal\Core\Utility\Title;
 use Drupal\Core\Utility\Error;
 use Symfony\Component\ClassLoader\ApcClassLoader;
@@ -656,7 +655,7 @@ function _drupal_request_initialize() {
 function drupal_get_filename($type, $name, $filename = NULL) {
   // The location of files will not change during the request, so do not use
   // drupal_static().
-  static $files = array();
+  static $files = array(), $dirs = array();
 
   // Profiles are converted into modules in system_rebuild_module_data().
   // @todo Remove false-exposure of profiles as modules.
@@ -668,31 +667,72 @@ function drupal_get_filename($type, $name, $filename = NULL) {
     $files[$type] = array();
   }
 
-  if (isset($filename)) {
+  if (!empty($filename)) {
     $files[$type][$name] = $filename;
   }
-  elseif (!isset($files[$type][$name])) {
-    // If the pathname of the requested extension is not known, try to retrieve
-    // the list of extension pathnames from various providers, checking faster
-    // providers first.
-    // Retrieve the current module list (derived from the service container).
-    if ($type == 'module' && \Drupal::hasService('module_handler')) {
-      $files[$type] += \Drupal::moduleHandler()->getModuleList();
-    }
-    // If still unknown, retrieve the file list prepared in state by
-    // system_rebuild_module_data() and system_rebuild_theme_data().
-    if (!isset($files[$type][$name]) && \Drupal::hasService('state')) {
-      $files[$type] += \Drupal::state()->get('system.' . $type . '.files', array());
+  elseif (isset($files[$type][$name])) {
+    // nothing
+  }
+  else {
+    // Verify that we have an keyvalue service before using it. This is required
+    // because this function is called during installation.
+    // @todo Inject database connection into KeyValueStore\DatabaseStorage.
+    if (\Drupal::hasService('keyvalue') && function_exists('db_query')) {
+      if ($type == 'module') {
+        if (empty($files[$type])) {
+          $files[$type] = \Drupal::moduleHandler()->getModuleList();
+        }
+        if (isset($files[$type][$name])) {
+          return $files[$type][$name];
+        }
+      }
+      try {
+        $file_list = \Drupal::state()->get('system.' . $type . '.files');
+        if ($file_list && isset($file_list[$name]) && file_exists(DRUPAL_ROOT . '/' . $file_list[$name])) {
+          $files[$type][$name] = $file_list[$name];
+        }
+      }
+      catch (Exception $e) {
+        // The keyvalue service raised an exception because the backend might
+        // be down. We have a fallback for this case so we hide the error
+        // completely.
+      }
     }
-    // If still unknown, perform a filesystem scan.
+    // Fallback to searching the filesystem if the database could not find the
+    // file or the file returned by the database is not found.
     if (!isset($files[$type][$name])) {
-      $listing = new ExtensionDiscovery();
-      // Prevent an infinite recursion by this legacy function.
-      if ($original_type == 'profile') {
-        $listing->setProfileDirectories(array());
+      // We have consistent directory naming: modules, themes...
+      $dir = $type . 's';
+      if ($type == 'theme_engine') {
+        $dir = 'themes/engines';
+        $extension = 'engine';
       }
-      foreach ($listing->scan($original_type) as $extension_name => $file) {
-        $files[$type][$extension_name] = $file->uri;
+      elseif ($type == 'theme') {
+        $extension = 'info.yml';
+      }
+      // Profiles are converted into modules in system_rebuild_module_data().
+      // @todo Remove false-exposure of profiles as modules.
+      elseif ($original_type == 'profile') {
+        $dir = 'profiles';
+        $extension = 'profile';
+      }
+      else {
+        $extension = $type;
+      }
+
+      if (!isset($dirs[$dir][$extension])) {
+        $dirs[$dir][$extension] = TRUE;
+        if (!function_exists('drupal_system_listing')) {
+          require_once __DIR__ . '/common.inc';
+        }
+        // Scan the appropriate directories for all files with the requested
+        // extension, not just the file we are currently looking for. This
+        // prevents unnecessary scans from being repeated when this function is
+        // called more than once in the same page request.
+        $matches = drupal_system_listing("/^" . DRUPAL_PHP_FUNCTION_PATTERN . "\.$extension$/", $dir);
+        foreach ($matches as $matched_name => $file) {
+          $files[$type][$matched_name] = $file->uri;
+        }
       }
     }
   }

core/includes/common.inc

@@ -20,6 +20,7 @@
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Datetime\DrupalDateTime;
 use Drupal\Core\Routing\GeneratorNotInitializedException;
+use Drupal\Core\SystemListingInfo;
 use Drupal\Core\Template\Attribute;
 use Drupal\Core\Render\Element;
 
@@ -3302,6 +3303,19 @@ function drupal_page_set_cache(Response $response, Request $request) {
   }
 }
 
+/**
+ * This function is kept only for backward compatibility.
+ *
+ * @see \Drupal\Core\SystemListing::scan().
+ */
+function drupal_system_listing($mask, $directory, $key = 'name', $min_depth = 1) {
+  // As SystemListing is required to build a dependency injection container
+  // from scratch and SystemListingInfo only extends SystemLising, this
+  // class needs to be hardwired.
+  $listing = new SystemListingInfo();
+  return $listing->scan($mask, $directory, $key, $min_depth);
+}
+
 /**
  * Sets the main page content value for later use.
  *

core/includes/install.core.inc

@@ -13,7 +13,7 @@
 use Drupal\Core\Language\Language;
 use Drupal\Core\Language\LanguageManager;
 use Drupal\Core\StringTranslation\Translator\FileTranslation;
-use Drupal\Core\Extension\ExtensionDiscovery;
+
 use Drupal\Core\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Reference;
@@ -494,21 +494,7 @@ function install_begin_request(&$install_state) {
     // Override the module list with a minimal set of modules.
     $module_handler->setModuleList(array('system' => 'core/modules/system/system.module'));
   }
-  // After setting up a custom and finite module list in a custom low-level
-  // bootstrap like here, ensure to use ModuleHandler::loadAll() so that
-  // ModuleHandler::isLoaded() returns TRUE, since that is a condition being
-  // checked by other subsystems (e.g., the theme system).
-  $module_handler->loadAll();
-
-  // Add list of all available profiles to the installation state.
-  $listing = new ExtensionDiscovery();
-  $listing->setProfileDirectories(array());
-  $install_state['profiles'] += $listing->scan('profile');
-
-  // Prime drupal_get_filename()'s static cache.
-  foreach ($install_state['profiles'] as $name => $profile) {
-    drupal_get_filename('profile', $name, $profile->uri);
-  }
+  $module_handler->load('system');
 
   // Prepare for themed output. We need to run this at the beginning of the
   // page request to avoid a different theme accidentally getting set. (We also
@@ -542,6 +528,9 @@ function install_begin_request(&$install_state) {
 
   // Modify the installation state as appropriate.
   $install_state['completed_task'] = $task;
+
+  // Add the list of available profiles to the installation state.
+  $install_state['profiles'] += drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.profile$/', 'profiles');
 }
 
 /**

core/includes/install.inc

@@ -10,7 +10,6 @@
 use Drupal\Component\Utility\Settings;
 use Drupal\Core\Database\Database;
 use Drupal\Core\DrupalKernel;
-use Drupal\Core\Extension\ExtensionDiscovery;
 
 /**
  * Requirement severity -- Informational message only.
@@ -124,17 +123,22 @@ function drupal_detect_database_types() {
 }
 
 /**
- * Returns all supported database driver installer objects.
+ * Returns all supported database installer objects that are compiled into PHP.
  *
- * @return \Drupal\Core\Database\Install\Tasks[]
- *   An array of available database driver installer objects.
+ * @return
+ *  An array of database installer objects compiled into PHP.
  */
 function drupal_get_database_types() {
   $databases = array();
   $drivers = array();
 
-  // The internal database driver name is any valid PHP identifier.
-  $mask = '/^' . DRUPAL_PHP_FUNCTION_PATTERN . '$/';
+  // We define a driver as a directory in /core/includes/database that in turn
+  // contains a database.inc file. That allows us to drop in additional drivers
+  // without modifying the installer.
+  require_once __DIR__ . '/database.inc';
+  // Allow any valid PHP identifier.
+  // @see http://www.php.net/manual/en/language.variables.basics.php.
+  $mask = '/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/';
   $files = file_scan_directory(DRUPAL_ROOT . '/core/lib/Drupal/Core/Database/Driver', $mask, array('recurse' => FALSE));
   if (is_dir(DRUPAL_ROOT . '/drivers/lib/Drupal/Driver/Database')) {
     $files += file_scan_directory(DRUPAL_ROOT . '/drivers/lib/Drupal/Driver/Database/', $mask, array('recurse' => FALSE));
@@ -580,16 +584,15 @@ function drupal_verify_profile($install_state) {
   }
   $info = $install_state['profile_info'];
 
-  // Get the list of available modules for the selected installation profile.
-  $listing = new ExtensionDiscovery();
+  // Get a list of modules that exist in Drupal's assorted subdirectories.
   $present_modules = array();
-  foreach ($listing->scan('module') as $present_module) {
+  foreach (drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.module$/', 'modules') as $present_module) {
     $present_modules[] = $present_module->name;
   }
 
   // The installation profile is also a module, which needs to be installed
   // after all the other dependencies have been installed.
-  $present_modules[] = $profile;
+  $present_modules[] = drupal_get_profile();
 
   // Verify that all of the profile's required modules are present.
   $missing_modules = array_diff($info['dependencies'], $present_modules);
@@ -973,7 +976,9 @@ function drupal_requirements_url($severity) {
 function drupal_check_profile($profile, array $install_state) {
   include_once __DIR__ . '/file.inc';
 
-  if (!isset($profile) || !isset($install_state['profiles'][$profile])) {
+  $profile_file = $install_state['profiles'][$profile]->uri;
+
+  if (!isset($profile) || !file_exists($profile_file)) {
     throw new Exception(install_no_profile_error());
   }
 

core/includes/module.inc

@@ -6,7 +6,6 @@
  */
 
 use Drupal\Core\Cache\Cache;
-use Drupal\Core\Extension\ExtensionDiscovery;
 
 /**
  * Builds a list of bootstrap modules and enabled modules and themes.
@@ -299,19 +298,14 @@ function module_uninstall($module_list = array(), $uninstall_dependents = TRUE)
  * Returns an array of modules required by core.
  */
 function drupal_required_modules() {
-  $listing = new ExtensionDiscovery();
-  $files = $listing->scan('module');
+  $files = drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info.yml$/', 'modules');
   $required = array();
 
-  // Unless called by the installer, an installation profile is required and
-  // must always be loaded. drupal_get_profile() also returns the installation
-  // profile in the installer, but only after it has been selected.
-  if ($profile = drupal_get_profile()) {
-    $required[] = $profile;
-  }
+  // An installation profile is required and one must always be loaded.
+  $required[] = drupal_get_profile();
 
   foreach ($files as $name => $file) {
-    $info = \Drupal::service('info_parser')->parse($file->getPathname());
+    $info = \Drupal::service('info_parser')->parse($file->uri);
     if (!empty($info) && !empty($info['required']) && $info['required']) {
       $required[] = $name;
     }

core/includes/theme.inc

@@ -12,7 +12,6 @@
 use Drupal\Component\Utility\Url;
 use Drupal\Core\Config\Config;
 use Drupal\Core\Language\Language;
-use Drupal\Core\Extension\Extension;
 use Drupal\Core\Extension\ExtensionNameLengthException;
 use Drupal\Core\Template\Attribute;
 use Drupal\Core\Template\RenderWrapper;
@@ -66,10 +65,10 @@
 /**
  * Determines if a theme is available to use.
  *
- * @param string|\Drupal\Core\Extension\Extension $theme
+ * @param $theme
  *   Either the name of a theme or a full theme object.
  *
- * @return bool
+ * @return
  *   Boolean TRUE if the theme is enabled or is the site administration theme;
  *   FALSE otherwise.
  *
@@ -79,7 +78,7 @@
  * @see \Drupal\Core\Theme\ThemeAccessCheck::checkAccess().
  */
 function drupal_theme_access($theme) {
-  if ($theme instanceof Extension) {
+  if (is_object($theme)) {
     $theme = $theme->name;
   }
   return \Drupal::service('access_check.theme')->checkAccess($theme);
@@ -122,9 +121,19 @@ function drupal_theme_initialize() {
  *
  * This function is useful to initialize a theme when no database is present.
  *
- * @param \Drupal\Core\Extension\Extension $theme
- *   The theme extension object.
- * @param \Drupal\Core\Extension\Extension[] $base_theme
+ * @param $theme
+ *   An object with the following information:
+ *     filename
+ *       The .info.yml file for this theme. The 'path' to
+ *       the theme will be in this file's directory. (Required)
+ *     owner
+ *       The path to the .theme file or the .engine file to load for
+ *       the theme. (Required)
+ *     stylesheet
+ *       The primary stylesheet for the theme. (Optional)
+ *     engine
+ *       The name of theme engine to use. (Optional)
+ * @param $base_theme
  *    An optional array of objects that represent the 'base theme' if the
  *    theme is meant to be derivative of another theme. It requires
  *    the same information as the $theme object. It should be in

core/lib/Drupal/Core/Config/InstallStorage.php

@@ -7,8 +7,6 @@
 
 namespace Drupal\Core\Config;
 
-use Drupal\Core\Extension\ExtensionDiscovery;
-
 /**
  * Storage controller used by the Drupal installer.
  *
@@ -112,14 +110,9 @@ public function listAll($prefix = '') {
    */
   protected function getAllFolders() {
     if (!isset($this->folders)) {
-      $this->folders = array();
-      // @todo Refactor getComponentNames() to use the extension list directly.
-      if ($profile = drupal_get_profile()) {
-        $this->folders += $this->getComponentNames('profile', array($profile));
-      }
-      $listing = new ExtensionDiscovery();
-      $this->folders += $this->getComponentNames('module', array_keys($listing->scan('module')));
-      $this->folders += $this->getComponentNames('theme', array_keys($listing->scan('theme')));
+      $this->folders = $this->getComponentNames('profile', array(drupal_get_profile()));
+      $this->folders += $this->getComponentNames('module', array_keys(drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.module$/', 'modules', 'name', 0)));
+      $this->folders += $this->getComponentNames('theme', array_keys(drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info.yml$/', 'themes')));
     }
     return $this->folders;
   }

core/lib/Drupal/Core/DrupalKernel.php

@@ -13,7 +13,6 @@
 use Drupal\Core\DependencyInjection\ContainerBuilder;
 use Drupal\Core\DependencyInjection\ServiceProviderInterface;
 use Drupal\Core\DependencyInjection\YamlFileLoader;
-use Drupal\Core\Extension\ExtensionDiscovery;
 use Drupal\Core\Language\Language;
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
@@ -84,7 +83,7 @@ class DrupalKernel implements DrupalKernelInterface, TerminableInterface {
    * An array of module data objects.
    *
    * The data objects have the same data structure as returned by
-   * ExtensionDiscovery but only the uri property is used.
+   * file_scan_directory() but only the uri property is used.
    *
    * @var array
    */
@@ -298,28 +297,19 @@ public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQ
   protected function moduleData($module) {
     if (!$this->moduleData) {
       // First, find profiles.
-      $listing = new ExtensionDiscovery();
-      $listing->setProfileDirectories(array());
-      $all_profiles = $listing->scan('profile');
-      $profiles = array_intersect_key($all_profiles, $this->moduleList);
-
+      $profiles_scanner = new SystemListing();
+      $all_profiles = $profiles_scanner->scan('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.profile$/', 'profiles');
+      $profiles = array_keys(array_intersect_key($this->moduleList, $all_profiles));
       // If a module is within a profile directory but specifies another
       // profile for testing, it needs to be found in the parent profile.
-      $settings = $this->configStorage->read('simpletest.settings');
-      $parent_profile = !empty($settings['parent_profile']) ? $settings['parent_profile'] : NULL;
-      if ($parent_profile && !isset($profiles[$parent_profile])) {
+      if (($parent_profile_config = $this->configStorage->read('simpletest.settings')) && isset($parent_profile_config['parent_profile']) && $parent_profile_config['parent_profile'] != $profiles[0]) {
         // In case both profile directories contain the same extension, the
         // actual profile always has precedence.
-        $profiles = array($parent_profile => $all_profiles[$parent_profile]) + $profiles;
+        array_unshift($profiles, $parent_profile_config['parent_profile']);
       }
-
-      $profile_directories = array_map(function ($profile) {
-        return $profile->getPath();
-      }, $profiles);
-      $listing->setProfileDirectories($profile_directories);
-
       // Now find modules.
-      $this->moduleData = $profiles + $listing->scan('module');
+      $modules_scanner = new SystemListing($profiles);
+      $this->moduleData = $all_profiles + $modules_scanner->scan('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.module$/', 'modules');
     }
     return isset($this->moduleData[$module]) ? $this->moduleData[$module] : FALSE;
   }

core/lib/Drupal/Core/Extension/Discovery/RecursiveExtensionFilterIterator.php

-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Extension\Discovery\RecursiveExtensionFilterIterator.
- */
-
-namespace Drupal\Core\Extension\Discovery;
-
-/**
- * Filters a RecursiveDirectoryIterator to discover extensions.
- *
- * To ensure the best possible performance for extension discovery, this
- * filter implementation hard-codes a range of assumptions about directories
- * in which Drupal extensions may appear and in which not. Every unnecessary
- * subdirectory tree recursion is avoided.
- *
- * The list of globally ignored directory names is defined in the
- * RecursiveExtensionFilterIterator::$blacklist property.
- *
- * In addition, all 'config' directories are skipped, unless the directory path
- * ends with 'modules/config', so as to still find the config module provided by
- * Drupal core and still allow that module to be overridden with a custom config
- * module.
- *
- * Lastly, ExtensionDiscovery instructs this filter to additionally skip all
- * 'tests' directories at regular runtime, since just with Drupal core only, the
- * discovery process yields 4x more extensions when tests are not ignored.
- *
- * @see ExtensionDiscovery::scan()
- * @see ExtensionDiscovery::scanDirectory()
- *
- * @todo Use RecursiveCallbackFilterIterator instead of the $acceptTests
- *   parameter forwarding once PHP 5.4 is available.
- */
-class RecursiveExtensionFilterIterator extends \RecursiveFilterIterator {
-
-  /**
-   * List of base extension type directory names to scan.
-   *
-   * Only these directory names are considered when starting a filesystem
-   * recursion in a search path.
-   *
-   * @var array
-   */
-  protected $whitelist = array(
-    'profiles',
-    'modules',
-    'themes',
-  );
-
-  /**
-   * List of directory names to skip when recursing.
-   *
-   * These directories are globally ignored in the recursive filesystem scan;
-   * i.e., extensions (of all types) are not able to use any of these names,
-   * because their directory names will be skipped.
-   *
-   * @var array
-   */
-  protected $blacklist = array(
-    // Object-oriented code subdirectories.
-    'src',
-    'lib',
-    'vendor',
-    // Front-end.
-    'assets',
-    'css',
-    'files',
-    'images',
-    'js',
-    'misc',
-    'templates',
-    // Legacy subdirectories.
-    'includes',
-    // Test subdirectories.
-    'fixtures',
-    // @todo ./tests/Drupal should be ./tests/src/Drupal
-    'Drupal',
-  );
-
-  /**
-   * Whether to include test directories when recursing.
-   *
-   * @var bool
-   */
-  protected $acceptTests = FALSE;
-
-  /**
-   * Controls whether test directories will be scanned.
-   *
-   * @param bool $flag
-   *   Pass FALSE to skip all test directories in the discovery. If TRUE,
-   *   extensions in test directories will be discovered and only the global
-   *   directory blacklist in RecursiveExtensionFilterIterator::$blacklist is
-   *   applied.
-   */
-  public function acceptTests($flag = FALSE) {
-    $this->acceptTests = $flag;
-    if (!$this->acceptTests) {
-      $this->blacklist[] = 'tests';
-    }
-  }
-
-  /**
-   * Overrides \RecursiveFilterIterator::getChildren().
-   */
-  public function getChildren() {
-    $filter = parent::getChildren();
-    // Pass the $acceptTests flag forward to child iterators.
-    $filter->acceptTests($this->acceptTests);
-    return $filter;
-  }
-
-  /**
-   * Implements \FilterIterator::accept().
-   */
-  public function accept() {
-    $name = $this->current()->getFilename();
-    // FilesystemIterator::SKIP_DOTS only skips '.' and '..', but not hidden
-    // directories (like '.git').
-    if ($name[0] == '.') {
-      return FALSE;
-    }
-    if ($this->isDir()) {
-      // If this is a subdirectory of a base search path, only recurse into the
-      // fixed list of expected extension type directory names. Required for
-      // scanning the top-level/root directory; without this condition, we would
-      // recurse into the whole filesystem tree that possibly contains other
-      // files aside from Drupal.
-      if ($this->current()->getSubPath() == '') {
-        return in_array($name, $this->whitelist, TRUE);
-      }
-      // 'config' directories are special-cased here, because every extension
-      // contains one. However, those default configuration directories cannot
-      // contain extensions. The directory name cannot be globally skipped,
-      // because core happens to have a directory of an actual module that is
-      // named 'config'. By explicitly testing for that case, we can skip all
-      // other config directories, and at the same time, still allow the core
-      // config module to be overridden/replaced in a profile/site directory
-      // (whereas it must be located directly in a modules directory).
-      if ($name == 'config') {
-        return substr($this->current()->getPathname(), -14) == 'modules/config';
-      }
-      // Accept the directory unless the name is blacklisted.
-      return !in_array($name, $this->blacklist, TRUE);
-    }
-    else {
-      // Only accept extension info files.
-      return substr($name, -9) == '.info.yml';
-    }
-  }
-
-}

core/lib/Drupal/Core/Extension/Extension.php

-<?php
-
-/**
- * @file
- * Contains \Drupal\Core\Extension\Extension.
- */
-
-namespace Drupal\Core\Extension;
-
-/**
- * Defines an extension (file) object.
- */
-class Extension implements \Serializable {
-
-  /**
-   * The type of the extension (e.g., 'module').
-   *
-   * @todo Replace all uses of $type with getType() method.
-   *
-   * @var string
-   */
-  public $type;
-
-  /**
-   * The relative pathname of the extension (e.g., 'core/modules/node/node.info.yml').
-   *
-   * @var string
-   */
-  protected $pathname;
-
-  /**
-   * The internal name of the extension (e.g., 'node').
-   *
-   * @todo Replace all uses of $name with getName() method.
-   *
-   * @var string
-   */
-  public $name;
-
-  /**
-   * The relative pathname of the main extension file (e.g., 'core/modules/node/node.module').
-   *
-   * @todo Remove this property and do not require .module/.profile files.
-   * @see https://drupal.org/node/340723
-   *
-   * @var string
-   */
-  public $uri;
-
-  /**
-   * The filename of the main extension file (e.g., 'node.module').
-   *
-   * Note that this is not necessarily a filename but a pathname and also not
-   * necessarily the filename of the info file. Due to legacy code and property
-   * value overloading, it is either the filename of the main extension file or
-   * the relative pathname of the main extension file (== $uri), depending on
-   * whether the object has been post-processed or not.
-   *
-   * @see _system_rebuild_module_data()
-   * @see \Drupal\Core\Extension\ThemeHandler::rebuildThemeData()
-   *
-   * @todo Remove this property and do not require .module/.profile files.
-   * @see https://drupal.org/node/340723
-   *
-   * @var string
-   */
-  public $filename;
-
-  /**
-   * An SplFileInfo instance for the extension's info file.
-   *
-   * Note that SplFileInfo is a PHP resource and resources cannot be serialized.
-   *
-   * @var \SplFileInfo
-   */
-  protected $splFileInfo;
-
-  /**
-   * Constructs a new Extension object.
-   *
-   * @param string $type
-   *   The type of the extension; e.g., 'module'.
-   * @param string $pathname
-   *   The relative path and filename of the extension's info file; e.g.,
-   *   'core/modules/node/node.info.yml'.
-   * @param string $filename
-   *   The filename of the main extension file; e.g., 'node.module'.
-   */
-  public function __construct($type, $pathname, $filename) {
-    $this->type = $type;
-    $this->pathname = $pathname;
-    // Set legacy public properties.
-    $this->name = basename($pathname, '.info.yml');
-    $this->filename = $filename;
-    $this->uri = dirname($pathname) . '/' . $filename;
-  }
-
-  /**
-   * Returns the type of the extension.
-   *
-   * @return string
-   */
-  public function getType() {
-    return $this->type;
-  }
-
-  /**
-   * Returns the internal name of the extension.
-   *
-   * @return string
-   */
-  public function getName() {
-    return basename($this->pathname, '.info.yml');
-  }
-
-  /**
-   * Returns the relative path of the extension.
-   *
-   * @return string
-   */
-  public function getPath() {
-    return dirname($this->pathname);
-  }
-
-  /**
-   * Returns the relative path and filename of the extension's info file.
-   *
-