class ProjectInfo

class ProjectInfo {
    
    /**
     * Populates an array of project data.
     *
     * This iterates over a list of the installed modules or themes and groups
     * them by project and status. A few parts of this function assume that
     * enabled modules and themes are always processed first, and if uninstalled
     * modules or themes are being processed (there is a setting to control if
     * uninstalled code should be included in the Available updates report or
     * not),those are only processed after $projects has been populated with
     * information about the enabled code. 'Hidden' modules and themes are
     * ignored if they are not installed. 'Hidden' Modules and themes in the
     * "Testing" package are ignored regardless of installation status.
     *
     * This function also records the latest change time on the .info.yml files
     * for each module or theme, which is important data which is used when
     * deciding if the available update data should be invalidated.
     *
     * @param array $projects
     *   Reference to the array of project data of what's installed on this site.
     * @param \Drupal\Core\Extension\Extension[] $list
     *   Array of data to process to add the relevant info to the $projects array.
     * @param string $project_type
     *   The kind of data in the list. Can be 'module' or 'theme'.
     * @param bool $status
     *   Boolean that controls what status (enabled or uninstalled) to process out
     *   of the $list and add to the $projects array.
     * @param array $additional_elements
     *   (optional) Array of additional elements to be collected from the .info.yml
     *   file. Defaults to array().
     */
    public function processInfoList(array &$projects, array $list, $project_type, $status, array $additional_elements = []) {
        foreach ($list as $file) {
            // Just projects with a matching status should be listed.
            if ($file->status != $status) {
                continue;
            }
            // Skip if the .info.yml file is broken.
            if (empty($file->info)) {
                continue;
            }
            // Skip if it's a hidden project and the project is not installed.
            if (!empty($file->info['hidden']) && empty($status)) {
                continue;
            }
            // Skip if it's a hidden project and the project is a test project. Tests
            // should use hook_system_info_alter() to test ProjectInfo's
            // functionality.
            if (!empty($file->info['hidden']) && isset($file->info['package']) && $file->info['package'] == 'Testing') {
                continue;
            }
            // If the .info.yml doesn't define the 'project', try to figure it out.
            if (!isset($file->info['project'])) {
                $file->info['project'] = $this->getProjectName($file);
            }
            // If we still don't know the 'project', give up.
            if (empty($file->info['project'])) {
                continue;
            }
            // If we don't already know it, grab the change time on the .info.yml file
            // itself. Note: we need to use the ctime, not the mtime (modification
            // time) since many (all?) tar implementations will go out of their way to
            // set the mtime on the files it creates to the timestamps recorded in the
            // tarball. We want to see the last time the file was changed on disk,
            // which is left alone by tar and correctly set to the time the .info.yml
            // file was unpacked.
            if (!isset($file->info['_info_file_ctime'])) {
                $file->info['_info_file_ctime'] = $file->getCTime();
            }
            if (!isset($file->info['datestamp'])) {
                $file->info['datestamp'] = 0;
            }
            $project_name = $file->info['project'];
            // Figure out what project type we're going to use to display this module
            // or theme. If the project name is 'drupal', we don't want it to show up
            // under the usual "Modules" section, we put it at a special "Drupal Core"
            // section at the top of the report.
            if ($project_name == 'drupal') {
                $project_display_type = 'core';
            }
            else {
                $project_display_type = $project_type;
            }
            if (empty($status)) {
                // If we're processing uninstalled modules or themes, append a suffix.
                $project_display_type .= '-disabled';
            }
            if (!isset($projects[$project_name])) {
                // Only process this if we haven't done this project, since a single
                // project can have multiple modules or themes.
                $projects[$project_name] = [
                    'name' => $project_name,
                    // Only save attributes from the .info.yml file we care about so we do
                    // not bloat our RAM usage needlessly.
'info' => $this->filterProjectInfo($file->info, $additional_elements),
                    'datestamp' => $file->info['datestamp'],
                    'includes' => [
                        $file->getName() => $file->info['name'],
                    ],
                    'project_type' => $project_display_type,
                    'project_status' => $status,
                ];
            }
            elseif ($projects[$project_name]['project_type'] == $project_display_type) {
                // Only add the file we're processing to the 'includes' array for this
                // project if it is of the same type and status (which is encoded in the
                // $project_display_type). This prevents listing all the uninstalled
                // modules included with an enabled project if we happen to be checking
                // for uninstalled modules, too.
                $projects[$project_name]['includes'][$file->getName()] = $file->info['name'];
                $projects[$project_name]['info']['_info_file_ctime'] = max($projects[$project_name]['info']['_info_file_ctime'], $file->info['_info_file_ctime']);
                $projects[$project_name]['datestamp'] = max($projects[$project_name]['datestamp'], $file->info['datestamp']);
            }
            elseif (empty($status)) {
                // If we have a project_name that matches, but the project_display_type
                // does not, it means we're processing a uninstalled module or theme
                // that belongs to a project that has some enabled code. In this case,
                // we add the uninstalled thing into a separate array for separate
                // display.
                $projects[$project_name]['disabled'][$file->getName()] = $file->info['name'];
            }
        }
    }
    
    /**
     * Determines what project a given file object belongs to.
     *
     * @param \Drupal\Core\Extension\Extension $file
     *   An extension object.
     *
     * @return string
     *   The canonical project short name.
     */
    public function getProjectName(Extension $file) {
        $project_name = '';
        if (isset($file->info['project'])) {
            $project_name = $file->info['project'];
        }
        elseif (strpos($file->getPath(), 'core/modules') === 0) {
            $project_name = 'drupal';
        }
        return $project_name;
    }
    
    /**
     * Filters the project .info.yml data to only save attributes we need.
     *
     * @param array $info
     *   Array of .info.yml file data as returned by
     *   \Drupal\Core\Extension\InfoParser.
     * @param $additional_elements
     *   (optional) Array of additional elements to be collected from the .info.yml
     *   file. Defaults to array().
     *
     * @return
     *   Array of .info.yml file data we need for the update manager.
     *
     * @see \Drupal\Core\Utility\ProjectInfo::processInfoList()
     */
    public function filterProjectInfo($info, $additional_elements = []) {
        $elements = [
            '_info_file_ctime',
            'datestamp',
            'major',
            'name',
            'package',
            'project',
            'project status url',
            'version',
        ];
        $elements = array_merge($elements, $additional_elements);
        return array_intersect_key($info, array_combine($elements, $elements));
    }

}