system.module 139 KB
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<?php

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/**
 * @file
 * Configuration system that lets administrators modify the workings of the site.
 */

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use Symfony\Component\HttpFoundation\Response;

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/**
 * Maximum age of temporary files in seconds.
 */
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const DRUPAL_MAXIMUM_TEMP_FILE_AGE = 21600;
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/**
 * New users will be set to the default time zone at registration.
 */
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const DRUPAL_USER_TIMEZONE_DEFAULT = 0;
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/**
 * New users will get an empty time zone at registration.
 */
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const DRUPAL_USER_TIMEZONE_EMPTY = 1;
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/**
 * New users will select their own timezone at registration.
 */
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const DRUPAL_USER_TIMEZONE_SELECT = 2;
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 /**
 * Disabled option on forms and settings
 */
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const DRUPAL_DISABLED = 0;
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/**
 * Optional option on forms and settings
 */
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const DRUPAL_OPTIONAL = 1;
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/**
 * Required option on forms and settings
 */
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const DRUPAL_REQUIRED = 2;
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/**
 * Maximum number of values in a weight select element.
 *
 * If the number of values is over the maximum, a text field is used instead.
 */
const DRUPAL_WEIGHT_SELECT_MAX = 100;

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/**
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 * Return only visible regions.
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 *
 * @see system_region_list()
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 */
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const REGIONS_VISIBLE = 'visible';
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/**
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 * Return all regions.
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 *
 * @see system_region_list()
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 */
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const REGIONS_ALL = 'all';
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/**
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 * Implements hook_help().
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 */
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function system_help($path, $arg) {
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  global $base_url;

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  switch ($path) {
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    case 'admin/help#system':
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      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
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      $output .= '<p>' . t('The System module is integral to the site, and provides basic but extensible functionality for use by other modules and themes. Some integral elements of Drupal are contained in and managed by the System module, including caching, enabling and disabling modules and themes, preparing and displaying the administrative page, and configuring fundamental site settings. A number of key system maintenance operations are also part of the System module. For more information, see the online handbook entry for <a href="@system">System module</a>.', array('@system' => 'http://drupal.org/documentation/modules/system')) . '</p>';
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      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Managing modules') . '</dt>';
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      $output .= '<dd>' . t('The System module allows users with the appropriate permissions to enable and disable modules on the <a href="@modules">Modules administration page</a>. Drupal comes with a number of core modules, and each module provides a discrete set of features and may be enabled or disabled depending on the needs of the site. Many additional modules contributed by members of the Drupal community are available for download at the <a href="@drupal-modules">Drupal.org module page</a>.', array('@modules' => url('admin/modules'), '@drupal-modules' => 'http://drupal.org/project/modules')) . '</dd>';
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      $output .= '<dt>' . t('Managing themes') . '</dt>';
      $output .= '<dd>' . t('The System module allows users with the appropriate permissions to enable and disable themes on the <a href="@themes">Appearance administration page</a>. Themes determine the design and presentation of your site. Drupal comes packaged with several core themes, and additional contributed themes are available at the <a href="@drupal-themes">Drupal.org theme page</a>.', array('@themes' => url('admin/appearance'), '@drupal-themes' => 'http://drupal.org/project/themes')) . '</dd>';
      $output .= '<dt>' . t('Managing caching') . '</dt>';
      $output .= '<dd>' . t("The System module allows users with the appropriate permissions to manage caching on the <a href='@cache-settings'>Performance settings page</a>. Drupal has a robust caching system that allows the efficient re-use of previously-constructed web pages and web page components. Pages requested by anonymous users are stored in a compressed format; depending on your site configuration and the amount of your web traffic tied to anonymous visitors, the caching system may significantly increase the speed of your site.", array('@cache-settings' => url('admin/config/development/performance'))) . '</dd>';
      $output .= '<dt>' . t('Performing system maintenance') . '</dt>';
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      $output .= '<dd>' . t('In order for the site and its modules to continue to operate well, a set of routine administrative operations must run on a regular basis. The System module manages this task by making use of a system cron job. You can verify the status of cron tasks by visiting the <a href="@status">Status report page</a>. For more information, see the online handbook entry for <a href="@handbook">configuring cron jobs</a>. You can set up cron job by visiting <a href="@cron">Cron configuration</a> page', array('@status' => url('admin/reports/status'), '@handbook' => 'http://drupal.org/cron', '@cron' => url('admin/config/system/cron'))) . '</dd>';
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      $output .= '<dt>' . t('Configuring basic site settings') . '</dt>';
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      $output .= '<dd>' . t('The System module also handles basic configuration options for your site, including <a href="@date-time-settings">Date and time settings</a>, <a href="@file-system">File system settings</a>, <a href="@site-info">Site name and other information</a>, and a <a href="@maintenance-mode">Maintenance mode</a> for taking your site temporarily offline.', array('@date-time-settings' => url('admin/config/regional/date-time'), '@file-system' => url('admin/config/media/file-system'), '@site-info' => url('admin/config/system/site-information'), '@maintenance-mode' => url('admin/config/development/maintenance'))) . '</dd>';
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      $output .= '<dt>' . t('Configuring actions') . '</dt>';
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      $output .= '<dd>' . t('Actions are individual tasks that the system can do, such as unpublishing a piece of content or banning a user. Other modules can fire these actions when certain system events happen; for example, when a new post is added or when a user logs in. Modules may also provide additional actions. Visit the <a href="@actions">Actions page</a> to configure actions.', array('@actions' => url('admin/config/system/actions'))) . '</dd>';
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      $output .= '</dl>';
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      return $output;
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    case 'admin/index':
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      return '<p>' . t('This page shows you all available administration tasks for each module.') . '</p>';
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    case 'admin/appearance':
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      $output = '<p>' . t('Set and configure the default theme for your website.  Alternative <a href="@themes">themes</a> are available.', array('@themes' => 'http://drupal.org/project/themes')) . '</p>';
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      return $output;
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    case 'admin/appearance/settings/' . $arg[3]:
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      $theme_list = list_themes();
      $theme = $theme_list[$arg[3]];
      return '<p>' . t('These options control the display settings for the %name theme. When your site is displayed using this theme, these settings will be used.', array('%name' => $theme->info['name'])) . '</p>';
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    case 'admin/appearance/settings':
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      return '<p>' . t('These options control the default display settings for your entire site, across all themes. Unless they have been overridden by a specific theme, these settings will be used.') . '</p>';
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    case 'admin/modules':
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      $output = '<p>' . t('Download additional <a href="@modules">contributed modules</a> to extend Drupal\'s functionality.', array('@modules' => 'http://drupal.org/project/modules')) . '</p>';
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      if (module_exists('update')) {
        if (update_manager_access()) {
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          $output .= '<p>' . t('Regularly review and install <a href="@updates">available updates</a> to maintain a secure and current site. Always run the <a href="@update-php">update script</a> each time a module is updated.', array('@update-php' => $base_url . '/core/update.php', '@updates' => url('admin/reports/updates'))) . '</p>';
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        }
        else {
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          $output .= '<p>' . t('Regularly review <a href="@updates">available updates</a> to maintain a secure and current site. Always run the <a href="@update-php">update script</a> each time a module is updated.', array('@update-php' => $base_url . '/core/update.php', '@updates' => url('admin/reports/updates'))) . '</p>';
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        }
      }
      else {
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        $output .= '<p>' . t('Regularly review available updates to maintain a secure and current site. Always run the <a href="@update-php">update script</a> each time a module is updated. Enable the Update Manager module to update and install modules and themes.', array('@update-php' => $base_url . '/core/update.php')) . '</p>';
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      }
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      return $output;
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    case 'admin/modules/uninstall':
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      return '<p>' . t('The uninstall process removes all data related to a module. To uninstall a module, you must first disable it on the main <a href="@modules">Modules page</a>.', array('@modules' => url('admin/modules'))) . '</p>';
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    case 'admin/structure/block/manage':
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      if ($arg[4] == 'system' && $arg[5] == 'powered-by') {
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        return '<p>' . t('The <em>Powered by Drupal</em> block is an optional link to the home page of the Drupal project. While there is absolutely no requirement that sites feature this link, it may be used to show support for Drupal.') . '</p>';
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      }
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      break;
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    case 'admin/config/development/maintenance':
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      global $user;
      if ($user->uid == 1) {
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        return '<p>' . t('Use maintenance mode when making major updates, particularly if the updates could disrupt visitors or the update process. Examples include upgrading, importing or exporting content, modifying a theme, modifying content types, and making backups.') . '</p>';
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      }
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      break;
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    case 'admin/config/system/actions':
    case 'admin/config/system/actions/manage':
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      $output = '';
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      $output .= '<p>' . t('There are two types of actions: simple and advanced. Simple actions do not require any additional configuration and are listed here automatically. Advanced actions need to be created and configured before they can be used because they have options that need to be specified; for example, sending an e-mail to a specified address or unpublishing content containing certain words. To create an advanced action, select the action from the drop-down list in the advanced action section below and click the <em>Create</em> button.') . '</p>';
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      return $output;
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    case 'admin/config/system/actions/configure':
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      return t('An advanced action offers additional configuration options which may be filled out below. Changing the <em>Description</em> field is recommended in order to better identify the precise action taking place.');
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    case 'admin/config/people/ip-blocking':
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      return '<p>' . t('IP addresses listed here are blocked from your site. Blocked addresses are completely forbidden from accessing the site and instead see a brief message explaining the situation.') . '</p>';
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    case 'admin/reports/status':
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      return '<p>' . t("Here you can find a short overview of your site's parameters as well as any problems detected with your installation. It may be useful to copy and paste this information into support requests filed on drupal.org's support forums and project issue queues.") . '</p>';
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  }
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}

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/**
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 * Implements hook_theme().
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 */
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function system_theme() {
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  return array_merge(drupal_common_theme(), array(
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    'system_themes_page' => array(
      'variables' => array('theme_groups' => NULL),
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      'file' => 'system.admin.inc',
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    ),
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    'system_settings_form' => array(
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      'render element' => 'form',
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    ),
    'confirm_form' => array(
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      'render element' => 'form',
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    ),
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    'system_modules_fieldset' => array(
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      'render element' => 'form',
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      'file' => 'system.admin.inc',
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    ),
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    'system_modules_incompatible' => array(
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      'variables' => array('message' => NULL),
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      'file' => 'system.admin.inc',
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    ),
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    'system_modules_uninstall' => array(
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      'render element' => 'form',
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      'file' => 'system.admin.inc',
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    ),
    'status_report' => array(
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      'render element' => 'requirements',
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      'file' => 'system.admin.inc',
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    ),
    'admin_page' => array(
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      'variables' => array('blocks' => NULL),
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      'file' => 'system.admin.inc',
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    ),
    'admin_block' => array(
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      'variables' => array('block' => NULL),
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      'file' => 'system.admin.inc',
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    ),
    'admin_block_content' => array(
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      'variables' => array('content' => NULL),
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      'file' => 'system.admin.inc',
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    ),
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    'system_admin_index' => array(
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      'variables' => array('menu_items' => NULL),
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      'file' => 'system.admin.inc',
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    ),
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    'system_powered_by' => array(
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      'variables' => array(),
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    ),
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    'system_compact_link' => array(
      'variables' => array(),
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    ),
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    'system_date_time_settings' => array(
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      'render element' => 'form',
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      'file' => 'system.admin.inc',
    ),
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  ));
}
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/**
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 * Implements hook_permission().
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 */
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function system_permission() {
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  return array(
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    'administer modules' => array(
      'title' => t('Administer modules'),
    ),
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    'administer site configuration' => array(
      'title' => t('Administer site configuration'),
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      'restrict access' => TRUE,
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    ),
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    'administer themes' => array(
      'title' => t('Administer themes'),
    ),
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    'administer software updates' => array(
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      'title' => t('Administer software updates'),
      'restrict access' => TRUE,
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    ),
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    'administer actions' => array(
      'title' => t('Administer actions'),
    ),
    'access administration pages' => array(
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      'title' => t('Use the administration pages and help'),
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    ),
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    'access site in maintenance mode' => array(
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      'title' => t('Use the site in maintenance mode'),
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    ),
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    'view the administration theme' => array(
      'title' => t('View the administration theme'),
      'description' => variable_get('admin_theme') ? '' : t('This is only used when the site is configured to use a separate administration theme on the <a href="@appearance-url">Appearance</a> page.', array('@appearance-url' => url('admin/appearance'))),
    ),
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    'access site reports' => array(
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      'title' => t('View site reports'),
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    ),
    'block IP addresses' => array(
      'title' => t('Block IP addresses'),
    ),
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  );
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}

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/**
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 * Implements hook_hook_info().
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 */
function system_hook_info() {
  $hooks['token_info'] = array(
    'group' => 'tokens',
  );
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  $hooks['token_info_alter'] = array(
    'group' => 'tokens',
  );
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  $hooks['tokens'] = array(
    'group' => 'tokens',
  );
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  $hooks['tokens_alter'] = array(
    'group' => 'tokens',
  );

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  return $hooks;
}

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/**
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 * Implements hook_entity_info().
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 */
function system_entity_info() {
  return array(
    'file' => array(
      'label' => t('File'),
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      'base table' => 'file_managed',
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      'controller class' => 'Drupal\Core\File\FileStorageController',
      'entity class' => 'Drupal\Core\File\File',
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      'entity keys' => array(
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        'id' => 'fid',
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        'label' => 'filename',
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      ),
      'static cache' => FALSE,
    ),
  );
}

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/**
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 * Implements hook_element_info().
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 */
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function system_element_info() {
  // Top level elements.
  $types['form'] = array(
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    '#method' => 'post',
    '#action' => request_uri(),
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    '#theme_wrappers' => array('form'),
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  );
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  $types['page'] = array(
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    '#show_messages' => TRUE,
    '#theme' => 'page',
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    '#theme_wrappers' => array('html'),
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  );
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  // By default, we don't want Ajax commands being rendered in the context of an
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  // HTML page, so we don't provide defaults for #theme or #theme_wrappers.
  // However, modules can set these properties (for example, to provide an HTML
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  // debugging page that displays rather than executes Ajax commands).
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  $types['ajax'] = array(
    '#header' => TRUE,
    '#commands' => array(),
    '#error' => NULL,
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  );
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  $types['html_tag'] = array(
    '#theme' => 'html_tag',
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    '#pre_render' => array('drupal_pre_render_conditional_comments'),
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    '#attributes' => array(),
    '#value' => NULL,
  );
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  $types['styles'] = array(
    '#items' => array(),
    '#pre_render' => array('drupal_pre_render_styles'),
    '#group_callback' => 'drupal_group_css',
    '#aggregate_callback' => 'drupal_aggregate_css',
  );
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  $types['scripts'] = array(
    '#items' => array(),
    '#pre_render' => array('drupal_pre_render_scripts'),
    '#group_callback' => 'drupal_group_js',
    '#aggregate_callback' => 'drupal_aggregate_js',
  );
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  // Input elements.
  $types['submit'] = array(
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    '#input' => TRUE,
    '#name' => 'op',
    '#button_type' => 'submit',
    '#executes_submit_callback' => TRUE,
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    '#limit_validation_errors' => FALSE,
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    '#process' => array('form_process_button', 'ajax_process_form'),
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    '#theme_wrappers' => array('button'),
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  );
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  $types['button'] = array(
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    '#input' => TRUE,
    '#name' => 'op',
    '#button_type' => 'submit',
    '#executes_submit_callback' => FALSE,
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    '#limit_validation_errors' => FALSE,
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    '#process' => array('form_process_button', 'ajax_process_form'),
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    '#theme_wrappers' => array('button'),
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  );
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  $types['image_button'] = array(
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    '#input' => TRUE,
    '#button_type' => 'submit',
    '#executes_submit_callback' => TRUE,
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    '#limit_validation_errors' => FALSE,
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    '#process' => array('form_process_button', 'ajax_process_form'),
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    '#return_value' => TRUE,
    '#has_garbage_value' => TRUE,
    '#src' => NULL,
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    '#theme_wrappers' => array('image_button'),
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  );
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  $types['textfield'] = array(
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    '#input' => TRUE,
    '#size' => 60,
    '#maxlength' => 128,
    '#autocomplete_path' => FALSE,
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    '#process' => array('form_process_autocomplete', 'ajax_process_form', 'form_process_pattern'),
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    '#theme' => 'textfield',
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    '#theme_wrappers' => array('form_element'),
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  );
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  $types['tel'] = array(
    '#input' => TRUE,
    '#size' => 30,
    '#maxlength' => 128,
    '#autocomplete_path' => FALSE,
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    '#process' => array('form_process_autocomplete', 'ajax_process_form', 'form_process_pattern'),
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    '#theme' => 'tel',
    '#theme_wrappers' => array('form_element'),
  );
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  $types['email'] = array(
    '#input' => TRUE,
    '#size' => 60,
    '#maxlength' => EMAIL_MAX_LENGTH,
    '#autocomplete_path' => FALSE,
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    '#process' => array('form_process_autocomplete', 'ajax_process_form', 'form_process_pattern'),
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    '#element_validate' => array('form_validate_email'),
    '#theme' => 'email',
    '#theme_wrappers' => array('form_element'),
  );
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  $types['url'] = array(
    '#input' => TRUE,
    '#size' => 60,
    '#maxlength' => 255,
    '#autocomplete_path' => FALSE,
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    '#process' => array('form_process_autocomplete', 'ajax_process_form', 'form_process_pattern'),
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    '#element_validate' => array('form_validate_url'),
    '#theme' => 'url',
    '#theme_wrappers' => array('form_element'),
  );
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  $types['search'] = array(
    '#input' => TRUE,
    '#size' => 60,
    '#maxlength' => 128,
    '#autocomplete_path' => FALSE,
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    '#process' => array('form_process_autocomplete', 'ajax_process_form'),
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    '#theme' => 'search',
    '#theme_wrappers' => array('form_element'),
  );
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  $types['number'] = array(
    '#input' => TRUE,
    '#step' => 1,
    '#process' => array('ajax_process_form'),
    '#element_validate' => array('form_validate_number'),
    '#theme' => 'number',
    '#theme_wrappers' => array('form_element'),
  );
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  $types['range'] = array(
    '#input' => TRUE,
    '#step' => 1,
    '#min' => 0,
    '#max' => 100,
    '#process' => array('ajax_process_form'),
    '#element_validate' => array('form_validate_number'),
    '#theme' => 'range',
    '#theme_wrappers' => array('form_element'),
  );
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  $types['machine_name'] = array(
    '#input' => TRUE,
    '#default_value' => NULL,
    '#required' => TRUE,
    '#maxlength' => 64,
    '#size' => 60,
    '#autocomplete_path' => FALSE,
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    '#process' => array('form_process_machine_name', 'form_process_autocomplete', 'ajax_process_form'),
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    '#element_validate' => array('form_validate_machine_name'),
    '#theme' => 'textfield',
    '#theme_wrappers' => array('form_element'),
  );
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  $types['password'] = array(
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    '#input' => TRUE,
    '#size' => 60,
    '#maxlength' => 128,
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    '#process' => array('ajax_process_form', 'form_process_pattern'),
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    '#theme' => 'password',
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    '#theme_wrappers' => array('form_element'),
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  );
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  $types['password_confirm'] = array(
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    '#input' => TRUE,
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    '#process' => array('form_process_password_confirm', 'user_form_process_password_confirm'),
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    '#theme_wrappers' => array('form_element'),
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  );
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  $types['textarea'] = array(
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    '#input' => TRUE,
    '#cols' => 60,
    '#rows' => 5,
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    '#resizable' => 'vertical',
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    '#process' => array('ajax_process_form'),
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    '#theme' => 'textarea',
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    '#theme_wrappers' => array('form_element'),
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  );
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  $types['radios'] = array(
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    '#input' => TRUE,
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    '#process' => array('form_process_radios'),
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    '#theme_wrappers' => array('radios'),
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    '#pre_render' => array('form_pre_render_conditional_form_element'),
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  );
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  $types['radio'] = array(
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    '#input' => TRUE,
    '#default_value' => NULL,
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    '#process' => array('ajax_process_form'),
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    '#theme' => 'radio',
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    '#theme_wrappers' => array('form_element'),
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    '#title_display' => 'after',
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  );
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  $types['checkboxes'] = array(
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    '#input' => TRUE,
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    '#process' => array('form_process_checkboxes'),
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    '#theme_wrappers' => array('checkboxes'),
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    '#pre_render' => array('form_pre_render_conditional_form_element'),
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  );
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  $types['checkbox'] = array(
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    '#input' => TRUE,
    '#return_value' => 1,
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    '#theme' => 'checkbox',
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    '#process' => array('form_process_checkbox', 'ajax_process_form'),
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    '#theme_wrappers' => array('form_element'),
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    '#title_display' => 'after',
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  );
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  $types['select'] = array(
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    '#input' => TRUE,
    '#multiple' => FALSE,
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    '#process' => array('form_process_select', 'ajax_process_form'),
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    '#theme' => 'select',
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    '#theme_wrappers' => array('form_element'),
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  );
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  $types['weight'] = array(
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    '#input' => TRUE,
    '#delta' => 10,
    '#default_value' => 0,
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    '#process' => array('form_process_weight', 'ajax_process_form'),
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  );
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  $types['date'] = array(
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    '#input' => TRUE,
    '#element_validate' => array('date_validate'),
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    '#process' => array('form_process_date'),
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    '#theme' => 'date',
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    '#theme_wrappers' => array('form_element'),
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  );
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  $types['file'] = array(
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    '#input' => TRUE,
    '#size' => 60,
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    '#theme' => 'file',
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    '#theme_wrappers' => array('form_element'),
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  );
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  $types['tableselect'] = array(
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    '#input' => TRUE,
    '#js_select' => TRUE,
    '#multiple' => TRUE,
    '#process' => array('form_process_tableselect'),
    '#options' => array(),
    '#empty' => '',
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    '#theme' => 'tableselect',
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  );
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  // Form structure.
  $types['item'] = array(
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    '#markup' => '',
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    '#pre_render' => array('drupal_pre_render_markup'),
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    '#theme_wrappers' => array('form_element'),
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  );
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  $types['hidden'] = array(
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    '#input' => TRUE,
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    '#process' => array('ajax_process_form'),
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    '#theme' => 'hidden',
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  );
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  $types['value'] = array(
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    '#input' => TRUE,
  );
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  $types['markup'] = array(
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    '#markup' => '',
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    '#pre_render' => array('drupal_pre_render_markup'),
  );
  $types['link'] = array(
    '#pre_render' => array('drupal_pre_render_link', 'drupal_pre_render_markup'),
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  );
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  $types['fieldset'] = array(
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    '#collapsible' => FALSE,
    '#collapsed' => FALSE,
    '#value' => NULL,
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    '#process' => array('form_process_fieldset', 'ajax_process_form'),
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    '#pre_render' => array('form_pre_render_fieldset'),
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    '#theme_wrappers' => array('fieldset'),
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  );
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  $types['vertical_tabs'] = array(
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    '#theme_wrappers' => array('vertical_tabs'),
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    '#default_tab' => '',
    '#process' => array('form_process_vertical_tabs'),
  );
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  $types['container'] = array(
    '#theme_wrappers' => array('container'),
    '#process' => array('form_process_container'),
  );
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  $types['actions'] = array(
    '#theme_wrappers' => array('container'),
    '#process' => array('form_process_actions', 'form_process_container'),
    '#weight' => 100,
  );
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  $types['token'] = array(
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    '#input' => TRUE,
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    '#theme' => 'hidden',
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  );

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  return $types;
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}

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/**
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 * Implements hook_menu().
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 */
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function system_menu() {
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  $items['cron/%'] = array(
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    'title' => 'Run cron',
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    'page callback' => 'system_cron_page',
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    'access callback' => 'system_cron_access',
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    'access arguments' => array(1),
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    'type' => MENU_CALLBACK,
  );
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  $items['system/files'] = array(
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    'title' => 'File download',
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    'page callback' => 'file_download',
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    'page arguments' => array('private'),
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );
  $items['system/temporary'] = array(
    'title' => 'Temporary files',
    'page callback' => 'file_download',
    'page arguments' => array('temporary'),
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    'access callback' => TRUE,
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    'type' => MENU_CALLBACK,
  );
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  $items['system/ajax'] = array(
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    'title' => 'AHAH callback',
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    'page callback' => 'ajax_form_callback',
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    'delivery callback' => 'ajax_deliver',
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    'access callback' => TRUE,
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    'theme callback' => 'ajax_base_page_theme',
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    'type' => MENU_CALLBACK,
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    'file path' => 'core/includes',
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    'file' => 'form.inc',
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  );
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  $items['system/timezone'] = array(
    'title' => 'Time zone',
    'page callback' => 'system_timezone',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
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    'file' => 'system.admin.inc',
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  );
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  $items['admin'] = array(
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    'title' => 'Administration',
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    'access arguments' => array('access administration pages'),
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    'page callback' => 'system_admin_menu_block_page',
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    'weight' => 9,
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    'menu_name' => 'management',
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    'file' => 'system.admin.inc',
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  );
  $items['admin/compact'] = array(
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    'title' => 'Compact mode',
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    'page callback' => 'system_admin_compact_page',
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    'access arguments' => array('access administration pages'),
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    'type' => MENU_CALLBACK,
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    'file' => 'system.admin.inc',
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  );
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  $items['admin/tasks'] = array(
    'title' => 'Tasks',
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    'type' => MENU_DEFAULT_LOCAL_TASK,
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    'weight' => -20,
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  );
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  $items['admin/index'] = array(
    'title' => 'Index',
    'page callback' => 'system_admin_index',
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    'access arguments' => array('access administration pages'),
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    'type' => MENU_LOCAL_TASK,
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    'weight' => -18,
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    'file' => 'system.admin.inc',
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  );
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  // Menu items that are basically just menu blocks.
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  $items['admin/structure'] = array(
    'title' => 'Structure',
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    'description' => 'Administer blocks, content types, menus, etc.',
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    'position' => 'right',
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    'weight' => -8,
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    'page callback' => 'system_admin_menu_block_page',
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    'access arguments' => array('access administration pages'),
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    'file' => 'system.admin.inc',
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  );
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  // Appearance.
  $items['admin/appearance'] = array(
    'title' => 'Appearance',
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    'description' => 'Select and configure your themes.',
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    'page callback' => 'system_themes_page',
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    'access arguments' => array('administer themes'),
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    'position' => 'left',
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    'weight' => -6,
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    'file' => 'system.admin.inc',
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  );
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  $items['admin/appearance/list'] = array(
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    'title' => 'List',
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    'description' => 'Select and configure your theme',
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    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -1,
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    'file' => 'system.admin.inc',
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  );
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  $items['admin/appearance/enable'] = array(
    'title' => 'Enable theme',
    'page callback' => 'system_theme_enable',
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    'access arguments' => array('administer themes'),
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    'type' => MENU_CALLBACK,
    'file' => 'system.admin.inc',
  );
  $items['admin/appearance/disable'] = array(
    'title' => 'Disable theme',
    'page callback' => 'system_theme_disable',
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    'access arguments' => array('administer themes'),
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    'type' => MENU_CALLBACK,
    'file' => 'system.admin.inc',
  );
  $items['admin/appearance/default'] = array(
    'title' => 'Set default theme',
    'page callback' => 'system_theme_default',
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    'access arguments' => array('administer themes'),
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    'type' => MENU_CALLBACK,
    'file' => 'system.admin.inc',
  );
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  $items['admin/appearance/settings'] = array(
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    'title' => 'Settings',
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    'description' => 'Configure default and theme specific settings.',
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    'page callback' => 'drupal_get_form',
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    'page arguments' => array('system_theme_settings'),
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    'access arguments' => array('administer themes'),
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    'type' => MENU_LOCAL_TASK,
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    'file' => 'system.admin.inc',
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    'weight' => 20,
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  );
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  // Theme configuration subtabs.
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  $items['admin/appearance/settings/global'] = array(
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    'title' => 'Global settings',
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    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -1,
  );
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  foreach (list_themes() as $key => $theme) {
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    $items['admin/appearance/settings/' . $theme->name] = array(
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      'title' => $theme->info['name'],
      'page arguments' => array('system_theme_settings', $theme->name),
      'type' => MENU_LOCAL_TASK,
      'access callback' => '_system_themes_access',
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      'access arguments' => array($key),
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      'file' => 'system.admin.inc',
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    );
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  }
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