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<?php

/**
 * @file
 * Primarily Drupal hooks and global API functions to manipulate views.
 *
 * This is the main module file for Views. The main entry points into
 * this module are views_page() and views_block(), where it handles
 * incoming page and block requests.
 */

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use Drupal\Core\Database\Query\AlterableInterface;
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use Drupal\views\ViewExecutable;
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use Drupal\Component\Plugin\Exception\PluginException;
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use Drupal\views\ViewStorage;
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/**
 * Views API version string.
 */
const VIEWS_API_VERSION = '3.0';

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/**
 * Advertise the current views api version
 */
function views_api_version() {
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  return VIEWS_API_VERSION;
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}

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/**
 * Returns a list of Drupal core modules.
 *
 * @return array
 */
function views_core_modules() {
  return array(
    'aggregator',
    'book',
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    'block',
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    'comment',
    'contact',
    'field',
    'filter',
    'file',
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    'language',
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    'locale',
    'node',
    'search',
    'statistics',
    'system',
    'taxonomy',
    'translation',
    'user'
  );
}

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/**
 * Implements hook_init().
 */
function views_init() {
  $path = drupal_get_path('module', 'views');
  $loader = drupal_classloader();
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  // Just register enabled modules.
  $modules = array_intersect(views_core_modules(), module_list('module_enabled'));
  foreach ($modules as $module) {
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    $function = $module . '_views_api';
    if (function_exists($function)) {
      $loader->registerNamespace('Views\\' . $module, DRUPAL_ROOT . '/' . $path . '/lib');
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    }
  }
}

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/**
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 * Implements hook_entity_info().
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 */
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function views_entity_info() {
  $return = array(
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    'view' => array(
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      'label' => t('View'),
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      'entity class' => 'Drupal\views\ViewStorage',
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      'controller class' => 'Drupal\views\ViewStorageController',
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      'list controller class' => 'Drupal\views_ui\ViewListController',
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      'list path' => 'admin/structure/views',
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      'form controller class' => array(
        'default' => 'Drupal\node\NodeFormController',
      ),
      'config prefix' => 'views.view',
      'fieldable' => FALSE,
      'entity keys' => array(
        'id' => 'name',
        'label' => 'human_name',
        'uuid' => 'uuid',
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      ),
    ),
  );
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  return $return;
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}

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/**
 * Implements hook_forms().
 *
 * To provide distinct form IDs for Views forms, the View name and
 * specific display name are appended to the base ID,
 * views_form_views_form. When such a form is built or submitted, this
 * function will return the proper callback function to use for the given form.
 */
function views_forms($form_id, $args) {
  if (strpos($form_id, 'views_form_') === 0) {
    return array(
      $form_id => array(
        'callback' => 'views_form',
      ),
    );
  }
}

/**
 * Returns a form ID for a Views form using the name and display of the View.
 */
function views_form_id($view) {
  $parts = array(
    'views_form',
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    $view->storage->name,
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    $view->current_display,
  );

  return implode('_', $parts);
}

/**
 * Views will not load plugins advertising a version older than this.
 */
function views_api_minimum_version() {
  return '2';
}

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/**
 * Implements hook_element_info().
 */
function views_element_info() {
  $types['view'] = array(
    '#theme_wrappers' => array('container'),
    '#pre_render' => array('views_pre_render_view_element'),
    '#name' => NULL,
    '#display_id' => 'default',
    '#arguments' => array(),
  );
  return $types;
}

/**
 * View element pre render callback.
 */
function views_pre_render_view_element($element) {
  $element['#attributes']['class'][] = 'views-element-container';

  $view = views_get_view($element['#name']);
  if ($view && $view->access($element['#display_id'])) {
    $element['view']['#markup'] = $view->preview($element['#display_id'], $element['#arguments']);
  }

  return $element;
}

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/**
 * Implement hook_theme(). Register views theming functions.
 */
function views_theme($existing, $type, $theme, $path) {
  $path = drupal_get_path('module', 'views');
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  module_load_include('inc', 'views', 'theme/theme');
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  // Some quasi clever array merging here.
  $base = array(
    'file' => 'theme.inc',
    'path' => $path . '/theme',
  );

  // Our extra version of pager from pager.inc
  $hooks['views_mini_pager'] = $base + array(
    'variables' => array('tags' => array(), 'quantity' => 10, 'element' => 0, 'parameters' => array()),
    'pattern' => 'views_mini_pager__',
  );

  $variables = array(
    // For displays, we pass in a dummy array as the first parameter, since
    // $view is an object but the core contextual_preprocess() function only
    // attaches contextual links when the primary theme argument is an array.
    'display' => array('view_array' => array(), 'view' => NULL),
    'style' => array('view' => NULL, 'options' => NULL, 'rows' => NULL, 'title' => NULL),
    'row' => array('view' => NULL, 'options' => NULL, 'row' => NULL, 'field_alias' => NULL),
    'exposed_form' => array('view' => NULL, 'options' => NULL),
    'pager' => array(
      'view' => NULL, 'options' => NULL,
      'tags' => array(), 'quantity' => 10, 'element' => 0, 'parameters' => array()
    ),
  );

  // Default view themes
  $hooks['views_view_field'] = $base + array(
    'pattern' => 'views_view_field__',
    'variables' => array('view' => NULL, 'field' => NULL, 'row' => NULL),
  );
  $hooks['views_view_grouping'] = $base + array(
    'pattern' => 'views_view_grouping__',
    'variables' => array('view' => NULL, 'grouping' => NULL, 'grouping_level' => NULL, 'rows' => NULL, 'title' => NULL),
  );

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  $plugins = views_get_plugin_definitions();
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  // Register theme functions for all style plugins
  foreach ($plugins as $type => $info) {
    foreach ($info as $plugin => $def) {
      if (isset($def['theme']) && (!isset($def['register theme']) || !empty($def['register theme']))) {
        $hooks[$def['theme']] = array(
          'pattern' => $def['theme'] . '__',
          'file' => $def['theme file'],
          'path' => $def['theme path'],
          'variables' => $variables[$type],
        );

        $include = DRUPAL_ROOT . '/' . $def['theme path'] . '/' . $def['theme file'];
        if (file_exists($include)) {
          require_once $include;
        }

        if (!function_exists('theme_' . $def['theme'])) {
          $hooks[$def['theme']]['template'] = drupal_clean_css_identifier($def['theme']);
        }
      }
      if (isset($def['additional themes'])) {
        foreach ($def['additional themes'] as $theme => $theme_type) {
          if (empty($theme_type)) {
            $theme = $theme_type;
            $theme_type = $type;
          }

          $hooks[$theme] = array(
            'pattern' => $theme . '__',
            'file' => $def['theme file'],
            'path' => $def['theme path'],
            'variables' => $variables[$theme_type],
          );

          if (!function_exists('theme_' . $theme)) {
            $hooks[$theme]['template'] = drupal_clean_css_identifier($theme);
          }
        }
      }
    }
  }

  $hooks['views_form_views_form'] = $base + array(
    'render element' => 'form',
  );

  $hooks['views_exposed_form'] = $base + array(
    'template' => 'views-exposed-form',
    'pattern' => 'views_exposed_form__',
    'render element' => 'form',
  );

  $hooks['views_more'] = $base + array(
    'template' => 'views-more',
    'pattern' => 'views_more__',
    'variables' => array('more_url' => NULL, 'link_text' => 'more', 'view' => NULL),
  );

  return $hooks;
}

/**
 * Scans a directory of a module for template files.
 *
 * @param $cache
 *   The existing cache of theme hooks to test against.
 * @param $path
 *   The path to search.
 *
 * @see drupal_find_theme_templates()
 */
function _views_find_module_templates($cache, $path) {
  $templates = array();
  $regex = '/' . '\.tpl\.php' . '$' . '/';

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  // @todo Remove this once #1626580 is committed. For now, We need to remove
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  //   the sites/* part of the path because drupal_system_listing() is already
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  //   adding that.
  $path = preg_replace('/^sites\/all\//', '', $path);
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  $config = str_replace('/', '\/', conf_path());
  $path = preg_replace('/^' . $config . '\//', '', $path);
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  // Because drupal_system_listing works the way it does, we check for real
  // templates separately from checking for patterns.
  $files = drupal_system_listing($regex, $path, 'name', 0);
  foreach ($files as $template => $file) {
    // Chop off the remaining extensions if there are any. $template already
    // has the rightmost extension removed, but there might still be more,
    // such as with .tpl.php, which still has .tpl in $template at this point.
    if (($pos = strpos($template, '.')) !== FALSE) {
      $template = substr($template, 0, $pos);
    }
    // Transform - in filenames to _ to match function naming scheme
    // for the purposes of searching.
    $hook = strtr($template, '-', '_');
    if (isset($cache[$hook])) {
      $templates[$hook] = array(
        'template' => $template,
        'path' => dirname($file->filename),
        'includes' => isset($cache[$hook]['includes']) ? $cache[$hook]['includes'] : NULL,
      );
    }
    // Ensure that the pattern is maintained from base themes to its sub-themes.
    // Each sub-theme will have their templates scanned so the pattern must be
    // held for subsequent runs.
    if (isset($cache[$hook]['pattern'])) {
      $templates[$hook]['pattern'] = $cache[$hook]['pattern'];
    }
  }

  $patterns = array_keys($files);

  foreach ($cache as $hook => $info) {
    if (!empty($info['pattern'])) {
      // Transform _ in pattern to - to match file naming scheme
      // for the purposes of searching.
      $pattern = strtr($info['pattern'], '_', '-');

      $matches = preg_grep('/^'. $pattern .'/', $patterns);
      if ($matches) {
        foreach ($matches as $match) {
          $file = substr($match, 0, strpos($match, '.'));
          // Put the underscores back in for the hook name and register this pattern.
          $templates[strtr($file, '-', '_')] = array(
            'template' => $file,
            'path' => dirname($files[$match]->uri),
            'variables' => isset($info['variables']) ? $info['variables'] : NULL,
            'render element' => isset($info['render element']) ? $info['render element'] : NULL,
            'base hook' => $hook,
            'includes' => isset($info['includes']) ? $info['includes'] : NULL,
          );
        }
      }
    }
  }

  return $templates;
}

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/**
 * Returns a list of plugins and metadata about them.
 *
 * @return array
 *   An array keyed by PLUGIN_TYPE:PLUGIN_NAME, like 'display:page' or
 *   'pager:full', containing an array with the following keys:
 *   - title: The plugin's title.
 *   - type: The plugin type.
 *   - module: The module providing the plugin.
 *   - views: An array of enabled Views that are currently using this plugin,
 *     keyed by machine name.
 */
function views_plugin_list() {
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  $plugin_data = views_get_plugin_definitions();
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  $plugins = array();
  foreach (views_get_enabled_views() as $view) {
    foreach ($view->display as $display_id => $display) {
      foreach ($plugin_data as $type => $info) {
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        if ($type == 'display' && isset($display['display_plugin'])) {
          $name = $display['display_plugin'];
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        }
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        elseif (isset($display['display_options']["{$type}_plugin"])) {
          $name = $display['display_options']["{$type}_plugin"];
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        }
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        elseif (isset($display['display_options'][$type]['type'])) {
          $name = $display['display_options'][$type]['type'];
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        }
        else {
          continue;
        }

        // Key first by the plugin type, then the name.
        $key = $type . ':' . $name;
        // Add info for this plugin.
        if (!isset($plugins[$key])) {
          $plugins[$key] = array(
            'type' => $type,
            'title' => check_plain($info[$name]['title']),
            'module' => check_plain($info[$name]['module']),
            'views' => array(),
          );
        }

        // Add this view to the list for this plugin.
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        $plugins[$key]['views'][$view->storage->name] = $view->storage->name;
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      }
    }
  }
  return $plugins;
}

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/**
 * A theme preprocess function to automatically allow view-based node
 * templates if called from a view.
 *
 * The 'modules/node.views.inc' file is a better place for this, but
 * we haven't got a chance to load that file before Drupal builds the
 * node portion of the theme registry.
 */
function views_preprocess_node(&$vars) {
  // The 'view' attribute of the node is added in views_preprocess_node()
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  if (!empty($vars['node']->view) && !empty($vars['node']->view->storage->name)) {
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    $vars['view'] = $vars['node']->view;
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    $vars['theme_hook_suggestions'][] = 'node__view__' . $vars['node']->view->storage->name;
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    if (!empty($vars['node']->view->current_display)) {
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      $vars['theme_hook_suggestions'][] = 'node__view__' . $vars['node']->view->storage->name . '__' . $vars['node']->view->current_display;
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      // If a node is being rendered in a view, and the view does not have a path,
      // prevent drupal from accidentally setting the $page variable:
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      if ($vars['page'] && $vars['view_mode'] == 'full' && !$vars['view']->display_handler->hasPath()) {
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        $vars['page'] = FALSE;
      }
    }
  }

  // Allow to alter comments and links based on the settings in the row plugin.
  if (!empty($vars['view']->style_plugin->row_plugin) && get_class($vars['view']->style_plugin->row_plugin) == 'views_plugin_row_node_view') {
    node_row_node_view_preprocess_node($vars);
  }
}

/**
 * A theme preprocess function to automatically allow view-based node
 * templates if called from a view.
 */
function views_preprocess_comment(&$vars) {
  // The 'view' attribute of the node is added in template_preprocess_views_view_row_comment()
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  if (!empty($vars['comment']->view) && !empty($vars['comment']->view->storage->name)) {
    $vars['view'] = &$vars['comment']->view;
    $vars['theme_hook_suggestions'][] = 'comment__view__' . $vars['comment']->view->storage->name;
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    if (!empty($vars['node']->view->current_display)) {
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      $vars['theme_hook_suggestions'][] = 'comment__view__' . $vars['comment']->view->storage->name . '__' . $vars['comment']->view->current_display;
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    }
  }
}

/**
 * Implement hook_permission().
 */
function views_permission() {
  return array(
    'administer views' => array(
      'title' => t('Administer views'),
      'description' => t('Access the views administration pages.'),
    ),
    'access all views' => array(
      'title' => t('Bypass views access control'),
      'description' => t('Bypass access control when accessing views.'),
    ),
  );
}

/**
 * Implement hook_menu().
 */
function views_menu() {
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  // Any event which causes a menu rebuild could potentially mean that the
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  // Views data is updated -- module changes, profile changes, etc.
  views_invalidate_cache();
  $items = array();
  $items['views/ajax'] = array(
    'title' => 'Views',
    'page callback' => 'views_ajax',
    'theme callback' => 'ajax_base_page_theme',
    'delivery callback' => 'ajax_deliver',
    'access callback' => TRUE,
    'description' => 'Ajax callback for view loading.',
    'type' => MENU_CALLBACK,
    'file' => 'includes/ajax.inc',
  );
  // Path is not admin/structure/views due to menu complications with the wildcards from
  // the generic ajax callback.
  $items['admin/views/ajax/autocomplete/user'] = array(
    'page callback' => 'views_ajax_autocomplete_user',
    'theme callback' => 'ajax_base_page_theme',
    'access callback' => 'user_access',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
    'file' => 'includes/ajax.inc',
  );
  // Define another taxonomy autocomplete because the default one of drupal
  // does not support a vid a argument anymore
  $items['admin/views/ajax/autocomplete/taxonomy'] = array(
    'page callback' => 'views_ajax_autocomplete_taxonomy',
    'theme callback' => 'ajax_base_page_theme',
    'access callback' => 'user_access',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
    'file' => 'includes/ajax.inc',
  );
  return $items;
}

/**
 * Implement hook_menu_alter().
 */
function views_menu_alter(&$callbacks) {
  $our_paths = array();
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  $views = views_get_applicable_views('uses_hook_menu');
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  foreach ($views as $data) {
    list($view, $display_id) = $data;
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    $result = $view->executeHookMenu($display_id, $callbacks);
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    if (is_array($result)) {
      // The menu system doesn't support having two otherwise
      // identical paths with different placeholders.  So we
      // want to remove the existing items from the menu whose
      // paths would conflict with ours.

      // First, we must find any existing menu items that may
      // conflict.  We use a regular expression because we don't
      // know what placeholders they might use.  Note that we
      // first construct the regex itself by replacing %views_arg
      // in the display path, then we use this constructed regex
      // (which will be something like '#^(foo/%[^/]*/bar)$#') to
      // search through the existing paths.
      $regex = '#^(' . preg_replace('#%views_arg#', '%[^/]*', implode('|', array_keys($result))) . ')$#';
      $matches = preg_grep($regex, array_keys($callbacks));

      // Remove any conflicting items that were found.
      foreach ($matches as $path) {
        // Don't remove the paths we just added!
        if (!isset($our_paths[$path])) {
          unset($callbacks[$path]);
        }
      }
      foreach ($result as $path => $item) {
        if (!isset($callbacks[$path])) {
          // Add a new item, possibly replacing (and thus effectively
          // overriding) one that we removed above.
          $callbacks[$path] = $item;
        }
        else {
          // This item already exists, so it must be one that we added.
          // We change the various callback arguments to pass an array
          // of possible display IDs instead of a single ID.
          $callbacks[$path]['page arguments'][1] = (array)$callbacks[$path]['page arguments'][1];
          $callbacks[$path]['page arguments'][1][] = $display_id;
          $callbacks[$path]['access arguments'][] = $item['access arguments'][0];
          $callbacks[$path]['load arguments'][1] = (array)$callbacks[$path]['load arguments'][1];
          $callbacks[$path]['load arguments'][1][] = $display_id;
        }
        $our_paths[$path] = TRUE;
      }
    }
  }

  // Save memory: Destroy those views.
  foreach ($views as $data) {
    list($view, $display_id) = $data;
    $view->destroy();
  }
}

/**
 * Helper function for menu loading. This will automatically be
 * called in order to 'load' a views argument; primarily it
 * will be used to perform validation.
 *
 * @param $value
 *   The actual value passed.
 * @param $name
 *   The name of the view. This needs to be specified in the 'load function'
 *   of the menu entry.
 * @param $display_id
 *   The display id that will be loaded for this menu item.
 * @param $index
 *   The menu argument index. This counts from 1.
 */
function views_arg_load($value, $name, $display_id, $index) {
  static $views = array();

  // Make sure we haven't already loaded this views argument for a similar menu
  // item elsewhere.
  $key = $name . ':' . $display_id . ':' . $value . ':' . $index;
  if (isset($views[$key])) {
    return $views[$key];
  }

  if ($view = views_get_view($name)) {
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    $view->setDisplay($display_id);
    $view->initHandlers();
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    $ids = array_keys($view->argument);

    $indexes = array();
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    $path = explode('/', $view->getPath());
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    foreach ($path as $id => $piece) {
      if ($piece == '%' && !empty($ids)) {
        $indexes[$id] = array_shift($ids);
      }
    }

    if (isset($indexes[$index])) {
      if (isset($view->argument[$indexes[$index]])) {
        $arg = $view->argument[$indexes[$index]]->validate_argument($value) ? $value : FALSE;
        $view->destroy();

        // Store the output in case we load this same menu item again.
        $views[$key] = $arg;
        return $arg;
      }
    }
    $view->destroy();
  }
}

/**
 * Page callback: Displays a page view, given a name and display id.
 *
 * @param $name
 *   The name of a view.
 * @param $display_id
 *   The display id of a view.
 *
 * @return
 *   Either the HTML of a fully-executed view, or MENU_NOT_FOUND.
 */
function views_page($name, $display_id) {
  $args = func_get_args();
  // Remove $name and $display_id from the arguments.
  array_shift($args);
  array_shift($args);

  // Load the view and render it.
  if ($view = views_get_view($name)) {
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    return $view->executeDisplay($display_id, $args);
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  }

  // Fallback; if we get here no view was found or handler was not valid.
  return MENU_NOT_FOUND;
}

/**
 * Implements hook_page_alter().
 */
function views_page_alter(&$page) {
  // If the main content of this page contains a view, attach its contextual
  // links to the overall page array. This allows them to be rendered directly
  // next to the page title.
  $view = views_get_page_view();
  if (!empty($view)) {
    // If a module is still putting in the display like we used to, catch that.
    if (is_subclass_of($view, 'views_plugin_display')) {
      $view = $view->view;
    }

    views_add_contextual_links($page, 'page', $view, $view->current_display);
  }
}

/**
 * Implements MODULE_preprocess_HOOK().
 */
function views_preprocess_html(&$variables) {
  // If the page contains a view as its main content, contextual links may have
  // been attached to the page as a whole; for example, by views_page_alter().
  // This allows them to be associated with the page and rendered by default
  // next to the page title (which we want). However, it also causes the
  // Contextual Links module to treat the wrapper for the entire page (i.e.,
  // the <body> tag) as the HTML element that these contextual links are
  // associated with. This we don't want; for better visual highlighting, we
  // prefer a smaller region to be chosen. The region we prefer differs from
  // theme to theme and depends on the details of the theme's markup in
  // page.tpl.php, so we can only find it using JavaScript. We therefore remove
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  // the "contextual-region" class from the <body> tag here and add
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  // JavaScript that will insert it back in the correct place.
  if (!empty($variables['page']['#views_contextual_links_info'])) {
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    $key = array_search('contextual-region', $variables['attributes']['class']->value());
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    if ($key !== FALSE) {
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      unset($variables['attributes']['class'][$key]);
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      // Add the JavaScript, with a group and weight such that it will run
      // before modules/contextual/contextual.js.
      drupal_add_js(drupal_get_path('module', 'views') . '/js/views-contextual.js', array('group' => JS_LIBRARY, 'weight' => -1));
    }
  }
}

/**
 * Implements hook_contextual_links_view_alter().
 */
function views_contextual_links_view_alter(&$element, $items) {
  // If we are rendering views-related contextual links attached to the overall
  // page array, add a class to the list of contextual links. This will be used
  // by the JavaScript added in views_preprocess_html().
  if (!empty($element['#element']['#views_contextual_links_info']) && !empty($element['#element']['#type']) && $element['#element']['#type'] == 'page') {
    $element['#attributes']['class'][] = 'views-contextual-links-page';
  }
}

/**
 * Implement hook_block_info().
 */
function views_block_info() {
  // Try to avoid instantiating all the views just to get the blocks info.
  views_include('cache');
  $cache = views_cache_get('views_block_items', TRUE);
  if ($cache && is_array($cache->data)) {
    return $cache->data;
  }

  $items = array();
  $views = views_get_all_views();
  foreach ($views as $view) {
    // disabled views get nothing.
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    if (!$view->isEnabled()) {
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      continue;
    }

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    $view->initDisplay();
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    foreach ($view->getExecutable()->displayHandlers as $display) {
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      if (isset($display) && !empty($display->definition['uses_hook_block'])) {
        $result = $display->executeHookBlockList();
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        if (is_array($result)) {
          $items = array_merge($items, $result);
        }
      }

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      if (isset($display) && $display->getOption('exposed_block')) {
        $result = $display->getSpecialBlocks();
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        if (is_array($result)) {
          $items = array_merge($items, $result);
        }
      }
    }
  }

  // block.module has a delta length limit of 32, but our deltas can
  // unfortunately be longer because view names can be 32 and display IDs
  // can also be 32. So for very long deltas, change to md5 hashes.
  $hashes = array();

  // get the keys because we're modifying the array and we don't want to
  // confuse PHP too much.
  $keys = array_keys($items);
  foreach ($keys as $delta) {
    if (strlen($delta) >= 32) {
      $hash = md5($delta);
      $hashes[$hash] = $delta;
      $items[$hash] = $items[$delta];
      unset($items[$delta]);
    }
  }

  // Only save hashes if they have changed.
  $old_hashes = variable_get('views_block_hashes', array());
  if ($hashes != $old_hashes) {
    variable_set('views_block_hashes', $hashes);
  }

  views_cache_set('views_block_items', $items, TRUE);

  return $items;
}

/**
 * Implement hook_block_view().
 */
function views_block_view($delta) {
  $start = microtime(TRUE);
  // if this is 32, this should be an md5 hash.
  if (strlen($delta) == 32) {
    $hashes = variable_get('views_block_hashes', array());
    if (!empty($hashes[$delta])) {
      $delta = $hashes[$delta];
    }
  }

  // This indicates it's a special one.
  if (substr($delta, 0, 1) == '-') {
    list($nothing, $type, $name, $display_id) = explode('-', $delta);
    // Put the - back on.
    $type = '-' . $type;
    if ($view = views_get_view($name)) {
      if ($view->access($display_id)) {
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        $view->setDisplay($display_id);
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        if (isset($view->display_handler)) {
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          $output = $view->display_handler->viewSpecialBlocks($type);
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          // Before returning the block output, convert it to a renderable
          // array with contextual links.
          views_add_block_contextual_links($output, $view, $display_id, 'special_block_' . $type);
          $view->destroy();
          return $output;
        }
      }
      $view->destroy();
    }
  }

  // If the delta doesn't contain valid data return nothing.
  $explode = explode('-', $delta);
  if (count($explode) != 2) {
    return;
  }
  list($name, $display_id) = $explode;
  // Load the view
  if ($view = views_get_view($name)) {
    if ($view->access($display_id)) {
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      $output = $view->executeDisplay($display_id);
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      // Before returning the block output, convert it to a renderable array
      // with contextual links.
      views_add_block_contextual_links($output, $view, $display_id);
      $view->destroy();
      return $output;
    }
    $view->destroy();
  }
}

/**
 * Converts Views block content to a renderable array with contextual links.
 *
 * @param $block
 *   An array representing the block, with the same structure as the return
 *   value of hook_block_view(). This will be modified so as to force
 *   $block['content'] to be a renderable array, containing the optional
 *   '#contextual_links' property (if there are any contextual links associated
 *   with the block).
 * @param $view
 *   The view that was used to generate the block content.
 * @param $display_id
 *   The ID of the display within the view that was used to generate the block
 *   content.
 * @param $block_type
 *   The type of the block. If it's block it's a regular views display,
 *   but 'special_block_-exp' exist as well.
 */
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function views_add_block_contextual_links(&$block, ViewExecutable $view, $display_id, $block_type = 'block') {
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  // Do not add contextual links to an empty block.
  if (!empty($block['content'])) {
    // Contextual links only work on blocks whose content is a renderable
    // array, so if the block contains a string of already-rendered markup,
    // convert it to an array.
    if (is_string($block['content'])) {
      $block['content'] = array('#markup' => $block['content']);
    }
    // Add the contextual links.
    views_add_contextual_links($block['content'], $block_type, $view, $display_id);
  }
}

/**
 * Adds contextual links associated with a view display to a renderable array.
 *
 * This function should be called when a view is being rendered in a particular
 * location and you want to attach the appropriate contextual links (e.g.,
 * links for editing the view) to it.
 *
 * The function operates by checking the view's display plugin to see if it has
 * defined any contextual links that are intended to be displayed in the
 * requested location; if so, it attaches them. The contextual links intended
 * for a particular location are defined by the 'contextual links' and
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 * 'contextual_links_locations' properties in the plugin annotation; as a
 * result, these hook implementations have full control over where and how
 * contextual links are rendered for each display.
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 *
 * In addition to attaching the contextual links to the passed-in array (via
 * the standard #contextual_links property), this function also attaches
 * additional information via the #views_contextual_links_info property. This
 * stores an array whose keys are the names of each module that provided
 * views-related contextual links (same as the keys of the #contextual_links
 * array itself) and whose values are themselves arrays whose keys ('location',
 * 'view_name', and 'view_display_id') store the location, name of the view,
 * and display ID that were passed in to this function. This allows you to
 * access information about the contextual links and how they were generated in
 * a variety of contexts where you might be manipulating the renderable array
 * later on (for example, alter hooks which run later during the same page
 * request).
 *
 * @param $render_element
 *   The renderable array to which contextual links will be added. This array
 *   should be suitable for passing in to drupal_render() and will normally
 *   contain a representation of the view display whose contextual links are
 *   being requested.
 * @param $location
 *   The location in which the calling function intends to render the view and
 *   its contextual links. The core system supports three options for this
 *   parameter:
 *   - 'block': Used when rendering a block which contains a view. This
 *     retrieves any contextual links intended to be attached to the block
 *     itself.
 *   - 'page': Used when rendering the main content of a page which contains a
 *     view. This retrieves any contextual links intended to be attached to the
 *     page itself (for example, links which are displayed directly next to the
 *     page title).
 *   - 'view': Used when rendering the view itself, in any context. This
 *     retrieves any contextual links intended to be attached directly to the
 *     view.
 *   If you are rendering a view and its contextual links in another location,
 *   you can pass in a different value for this parameter. However, you will
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 *   also need to set 'contextual_links_locations' in your plugin annotation to
 *   indicate which view displays support having their contextual links
 *   rendered in the location you have defined.
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 * @param $view
 *   The view whose contextual links will be added.
 * @param $display_id
 *   The ID of the display within $view whose contextual links will be added.
 *
 * @see views_block_view()
 * @see views_page_alter()
 * @see template_preprocess_views_view()
 */
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function views_add_contextual_links(&$render_element, $location, ViewExecutable $view, $display_id) {
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  // Do not do anything if the view is configured to hide its administrative
  // links.
  if (empty($view->hide_admin_links)) {
    // Also do not do anything if the display plugin has not defined any
    // contextual links that are intended to be displayed in the requested
    // location.
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    $plugin = views_get_plugin_definition('display', $view->displayHandlers[$display_id]->display['display_plugin']);
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    // If contextual_links_locations are not set, provide a sane default. (To
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    // avoid displaying any contextual links at all, a display plugin can still
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    // set 'contextual_links_locations' to, e.g., {""}.)
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    if (!isset($plugin['contextual_links_locations'])) {
      $plugin['contextual_links_locations'] = array('view');
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    }
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    elseif ($plugin['contextual_links_locations'] == array() || $plugin['contextual_links_locations'] == array('')) {
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      $plugin['contextual_links_locations'] = array();
    }
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    else {
      $plugin += array('contextual_links_locations' => array('view'));
    }

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    // On exposed_forms blocks contextual links should always be visible.
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    $plugin['contextual_links_locations'][] = 'special_block_-exp';
    $has_links = !empty($plugin['contextual links']) && !empty($plugin['contextual_links_locations']);
    if ($has_links && in_array($location, $plugin['contextual_links_locations'])) {
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      foreach ($plugin['contextual links'] as $module => $link) {
        $args = array();
        $valid = TRUE;
        if (!empty($link['argument properties'])) {
          foreach ($link['argument properties'] as $property) {
            // If the plugin is trying to create an invalid contextual link
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            // (for example, "path/to/{$view->storage->property}", where
            // $view->storage->{property} does not exist), we cannot construct
            // the link, so we skip it.
            if (!property_exists($view->storage, $property)) {
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              $valid = FALSE;
              break;
            }
            else {
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              $args[] = $view->storage->{$property};
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            }
          }
        }
        // If the link was valid, attach information about it to the renderable
        // array.
        if ($valid) {
          $render_element['#contextual_links'][$module] = array($link['parent path'], $args);
          $render_element['#views_contextual_links_info'][$module] = array(
            'location' => $location,
            'view' => $view,
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            'view_name' => $view->storage->name,
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            'view_display_id' => $display_id,
          );
        }
      }
    }
  }
}

/**
 * Returns an array of language names.
 *
 * This is a one to one copy of locale_language_list because we can't rely on enabled locale module.
 *
 * @param $field
 *   'name' => names in current language, localized
 *   'native' => native names
 * @param $all
 *   Boolean to return all languages or only enabled ones
 *
 * @see locale_language_list()
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 * @todo Figure out whether we need this with language module.
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 */
function views_language_list($field = 'name', $all = FALSE) {
  if ($all) {
    $languages = language_list();
  }
  else {
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    $languages = language_list();
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  }
  $list = array();
  foreach ($languages as $language) {
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    $list[$language->langcode] = ($field == 'name') ? t($language->name) : $language->$field;
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  }
  return $list;
}

/**
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 * Implements hook_cache_flush().
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 */
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function views_cache_flush() {
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  return array('views_info', 'views_results');
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}

/**
 * Implements hook_field_create_instance.
 */
function views_field_create_instance($instance) {
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  cache('views_info')->flush();
  cache('views_results')->flush();
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}

/**
 * Implements hook_field_update_instance.
 */
function views_field_update_instance($instance, $prior_instance) {
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  cache('views_info')->flush();
  cache('views_results')->flush();
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}

/**
 * Implements hook_field_delete_instance.
 */
function views_field_delete_instance($instance) {
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  cache('views_info')->flush();
  cache('views_results')->flush();
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}

/**
 * Invalidate the views cache, forcing a rebuild on the next grab of table data.
 */
function views_invalidate_cache() {
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  // Clear the views cache.
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  cache('views_info')->flush();
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  // Clear the page and block cache.
  cache_invalidate(array('content' => TRUE));

  // Set the menu as needed to be rebuilt.
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  state()->set('menu_rebuild_needed', TRUE);
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  // Allow modules to respond to the Views cache being cleared.
  module_invoke_all('views_invalidate_cache');
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}

/**
 * Access callback to determine if the user can import Views.
 *
 * View imports require an additional access check because they are PHP
 * code and PHP is more locked down than administer views.
 */
function views_import_access() {
  return user_access('administer views') && user_access('use PHP for settings');
}

/**
 * Determine if the logged in user has access to a view.
 *
 * This function should only be called from a menu hook or some other
 * embedded source. Each argument is the result of a call to
 * views_plugin_access::get_access_callback() which is then used
 * to determine if that display is accessible. If *any* argument
 * is accessible, then the view is accessible.
 */
function views_access() {
  $args = func_get_args();
  foreach ($args as $arg) {
    if ($arg === TRUE) {
      return TRUE;
    }

    if (!is_array($arg)) {
      continue;
    }

    list($callback, $arguments) = $arg;
    $arguments = $arguments ? $arguments : array();
    // Bring dynamic arguments to the access callback.
    foreach ($arguments as $key => $value) {
      if (is_int($value) && isset($args[$value])) {
        $arguments[$key] = $args[$value];
      }
    }
    if (function_exists($callback) && call_user_func_array($callback, $arguments)) {
      return TRUE;
    }
  }

  return FALSE;
}

/**
 * Access callback for the views_plugin_access_perm access plugin.
 *
 * Determine if the specified user has access to a view on the basis of
 * permissions. If the $account argument is omitted, the current user
 * is used.
 */
function views_check_perm($perm, $account = NULL) {
  return user_access($perm, $account) || user_access('access all views', $account);
}

/**
 * Access callback for the views_plugin_access_role access plugin.

 * Determine if the specified user has access to a view on the basis of any of
 * the requested roles. If the $account argument is omitted, the current user
 * is used.
 */
function views_check_roles($rids, $account = NULL) {
  global $user;
  $account = isset($account) ? $account : $user;
  $roles = array_keys($account->roles);
  $roles[] = $account->uid ? DRUPAL_AUTHENTICATED_RID : DRUPAL_ANONYMOUS_RID;
  return user_access('access all views', $account) || array_intersect(array_filter($rids), $roles);
}

/**
 * Set the current 'page view' that is being displayed so that it is easy
 * for other modules or the theme to identify.
 */
function &views_set_page_view($view = NULL) {
  static $cache = NULL;
  if (isset($view)) {
    $cache = $view;
  }

  return $cache;
}

/**
 * Find out what, if any, page view is currently in use. Please note that
 * this returns a reference, so be careful! You can unintentionally modify the
 * $view object.
 *
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 * @return Drupal\views\ViewExecutable
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 *   A fully formed, empty $view object.
 */
function &views_get_page_view() {
  return views_set_page_view();
}

/**
 * Set the current 'current view' that is being built/rendered so that it is
 * easy for other modules or items in drupal_eval to identify
 *
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 * @return Drupal\views\ViewExecutable
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 */
function &views_set_current_view($view = NULL) {
  static $cache = NULL;
  if (isset($view)) {
    $cache = $view;
  }

  return $cache;
}

/**
 * Find out what, if any, current view is currently in use. Please note that
 * this returns a reference, so be careful! You can unintentionally modify the
 * $view object.
 *
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 * @return Drupal\views\ViewExecutable
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 */
function &views_get_current_view() {
  return views_set_current_view();
}

/**
 * Include views .inc files as necessary.
 */
function views_include($file) {
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  module_load_include('inc', 'views', 'includes/' . $file);
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}

/**
 * Load views files on behalf of modules.
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 *
 * @todo Remove this function once the views integration got moved into the
 *   core modules itself.
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 */
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function views_module_include() {
  $loaded_files = &drupal_static(__FUNCTION__, array());

  $minimum_version = views_api_minimum_version();
  $current_version = views_api_version();
  foreach (module_implements('views_api') as $module) {
    if (isset($loaded_files[$module])) {
      continue;
    }
    $info = module_invoke($module, 'views_api');
    $version = $info['api'];
    $path = isset($info['path']) ? $info['path'] : drupal_get_path('module', $module);
    // Only process if version is between minimum and current, inclusive.
    if (version_compare($version, $minimum_version, '>=') && version_compare($version, $current_version, '<=')) {
      $path = $path . "/$module.views.inc";
      if (file_exists($path)) {
        include_once $path;
        $loaded_files[$module] = TRUE;
      }
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    }
  }
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}
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/**
 * Implements hook_hook_info().
 */
function views_hook_info() {
  $hooks['views_data'] = array(
    'group' => 'views',
  );

  return $hooks;
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}

/**
 * Include views .css files.
 */
function views_add_css($file) {
  // We set preprocess to FALSE because we are adding the files conditionally,
  // and we don't want to generate duplicate cache files.
  // TODO: at some point investigate adding some files unconditionally and
  // allowing preprocess.
  drupal_add_css(drupal_get_path('module', 'views') . "/css/$file.css", array('preprocess' => FALSE));
}

/**
 * Include views .js files.
 */
function views_add_js($file) {
  // If javascript has been disabled by the user, never add js files.
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  if (config('views.settings')->get('no_javascript')) {
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    return;
  }
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  $path = drupal_get_path('module', 'views');
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  static $base = TRUE, $ajax = TRUE;
  if ($base) {
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    drupal_add_js($path . "/js/base.js");
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    $base = FALSE;
  }
  if ($ajax && in_array($file, array('ajax', 'ajax_view'))) {
    drupal_add_library('system', 'drupal.ajax');
    drupal_add_library('system', 'jquery.form');
    $ajax = FALSE;
  }
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  drupal_add_js($path . "/js/$file.js");
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}

/**
 * Load views files on behalf of modules.
 */
function views_include_handlers($reset = FALSE) {
  static $finished = FALSE;
  // Ensure this only gets run once.
  if ($finished && !$reset) {
    return;
  }

  views_include('cache');
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  views_module_include();
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  $finished = TRUE;
}

/**
 * Fetch a handler from the data cache.
 *
 * @param $table
 *   The name of the table this handler is from.
 * @param $field
 *   The name of the field this handler is from.
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 * @param $type
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 *   The type of handler. i.e, sort, field, argument, filter, relationship
 * @param $override
 *   Override the actual handler object with this class. Used for
 *   aggregation when the handler is redirected to the aggregation
 *   handler.
 *
 * @return views_handler
 *   An instance of a handler object. May be views_handler_broken.
 */
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function views_get_handler($table, $field, $type, $override = NULL) {
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  // Get the plugin manager for this type.
  $manager = drupal_container()->get("plugin.manager.views.$type");
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  $data = views_fetch_data($table);
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  if (isset($data[$field][$type])) {
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    $definition = $data[$field][$type];
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    foreach (array('group', 'title', 'title short', 'help', 'real field', 'real table') as $key) {
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      if (!isset($definition[$key])) {
        // First check the field level
        if (!empty($data[$field][$key])) {
          $definition[$key] = $data[$field][$key];
        }
        // Then if that doesn't work, check the table level
        elseif (!empty($data['table'][$key])) {
          $definition[$key] = $data['table'][$key];
        }
      }
    }

    // @todo This is crazy. Find a way to remove the override functionality.
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    $plugin_id = $override ?: $definition['id'];
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    // Try to use the overridden handler.
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    try {
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      return $manager->createInstance($plugin_id, $definition);
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    }
    catch (PluginException $e) {
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      // If that fails, use the original handler.
      try {
        return $manager->createInstance($definition['id'], $definition);
      }
      catch (PluginException $e) {
        // Deliberately empty, this case is handled generically below.
      }
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    }
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  }

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  // Finally, use the 'broken' handler.
  debug(t("Missing handler: @table @field @type", array('@table' => $table, '@field' => $field, '@type' => $type)));
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  return $manager->createInstance('broken');
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}

/**
 * Fetch Views' data from the cache
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 *
 * $param string|null $table
 *   (optional) The name of the table for which to fetch Views' data. If
 *   NULL, data for all tables will be retrieved
 * @param bool $reset
 *   (optional) Whether to rebuild the cache. Defaults to FALSE.
 *
 * @return array
 *   An associative array of views data for the given table. If $table is
 *   NULL, the array will be keyed by table name, with each key corresponding
 *   to the data array for that table.
 *
 * @see hook_views_data()
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 */
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function views_fetch_data($table = NULL, $reset = FALSE) {
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  views_include('cache');
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  return _views_fetch_data($table, $reset);
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}

/**
 * Fetch a list of all base tables available
 *
 * @param $type
 *   Either 'display', 'style' or 'row'
 * @param $key
 *   For style plugins, this is an optional type to restrict to. May be 'normal',
 *   'summary', 'feed' or others based on the neds of the display.
 * @param $base
 *   An array of possible base tables.
 *
 * @return
 *   A keyed array of in the form of 'base_table' => 'Description'.
 */
function views_fetch_plugin_names($type, $key = NULL, $base = array()) {
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  $definitions = views_get_plugin_definitions($type);
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  $plugins = array();
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  foreach ($definitions as $id => $plugin) {
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    // Skip plugins that don't conform to our key.
    if ($key && (empty($plugin['type']) || $plugin['type'] != $key)) {
      continue;
    }
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    // @todo While Views is providing on behalf of core modules, check to see
    //   if they are enabled or not.
    if (isset($plugin['module']) && !module_exists($plugin['module'])) {
      continue;
    }
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    if (empty($plugin['no_ui']) && (empty($base) || empty($plugin['base']) || array_intersect($base, $plugin['base']))) {
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      $plugins[$id] = $plugin['title'];
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    }
  }

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  if (!empty($plugins)) {
    asort($plugins);
    return $plugins;
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  }
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  // fall-through
  return array();
}

/**
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 * Get an instance of a plugin.
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 *
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 * @param string $type
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 *   The plugin type, e.g., 'access' or 'display'.
 * @param string $plugin_id
 *   The name of the plugin, e.g., 'standard'.
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 *
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 * @return Drupal\views\Plugin\view\PluginBase
 *   The created plugin instance.
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 */
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function views_get_plugin($type, $plugin_id) {
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  return drupal_container()->get("plugin.manager.views.$type")->createInstance($plugin_id);
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}

/**
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 * Gets all the views plugin definitions.
 *
 * @param string|false $type
 *   Either the plugin type, or FALSE to load all definitions.
 *
 * @return array
 *   An array of plugin definitions for a single type, or an associative array
 *   of plugin definitions keyed by plugin type.
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 */
function views_get_plugin_definitions($type = FALSE) {
  $plugins = array();
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  $plugin_types = $type ? array($type) : ViewExecutable::getPluginTypes();
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  $container = drupal_container();
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  foreach ($plugin_types as $plugin_type) {
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    $plugins[$plugin_type] = $container->get("plugin.manager.views.$plugin_type")->getDefinitions();
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  }
  if ($type) {
    return $plugins[$type];
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  }
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  return $plugins;
}

/**
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 * Gets the plugin definition from a plugin type with a specific ID.
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 *
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 * @param string $type
 *   The plugin type, e.g., 'access' or 'display'.
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 * @param string $plugin_id
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 *   The name of the plugin, e.g., 'standard'.
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 *
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 * @return array
 *   A plugin definition.
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 */
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function views_get_plugin_definition($type, $plugin_id) {
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  return drupal_container()->get("plugin.manager.views.$type")->getDefinition($plugin_id);
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}

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/**
 * Get enabled display extenders.
 */
function views_get_enabled_display_extenders() {
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  $enabled = array_filter((array) config('views.settings')->get('display_extenders'));
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  return drupal_map_assoc($enabled);
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}

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/**
 * Create an empty view to work with.
 *
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 * @return Drupal\views\ViewStorage
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 *   A fully formed, empty $view object. This object must be populated before
 *   it can be successfully saved.
 */
function views_new_view() {
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  return entity_create('view', array());
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}

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/**
 * Creates a view from an array of values.
 *
 * @return Drupal\views\ViewStorage
 *   A fully formed $view object with properties from the values passed in.
 */
function views_create_view(array $values = array()) {
  return entity_create('view', $values);
}

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/**
 * Return a list of all views and display IDs that have a particular
 * setting in their display's plugin settings.
 *
 * @return
 * @code
 * array(
 *   array($view, $display_id),
 *   array($view, $display_id),
 * );
 * @endcode
 */
function views_get_applicable_views($type) {
  // @todo: Use a smarter flagging system so that we don't have to
  // load every view for this.
  $result = array();
  $views = views_get_all_views();

  foreach ($views as $view) {
    // Skip disabled views.
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    if (!$view->isEnabled()) {
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      continue;
    }

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    if (empty($view->display)) {
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      // Skip this view as it is broken.
      continue;
    }

    // Loop on array keys because something seems to muck with $view->display
    // a bit in PHP4.
    foreach (array_keys($view->display) as $id) {
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      $plugin = views_get_plugin_definition('display', $view->display[$id]['display_plugin']);
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      if (!empty($plugin[$type])) {
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        $executable = $view->getExecutable();
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        // This view uses_hook_menu. Clone it so that different handlers
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        // don't trip over each other, and add it to the list.
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        $v = $executable->cloneView();
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        if ($v->setDisplay($id) && $v->display_handler->isEnabled()) {
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          $result[] = array($v, $id);
        }
        // In PHP 4.4.7 and presumably earlier, if we do not unset $v
        // here, we will find that it actually overwrites references
        // possibly due to shallow copying issues.
        unset($v);
      }
    }
  }
  return $result;
}

/**
 * Return an array of all views as fully loaded $view objects.
 *
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 * @todo Figure out whether you expect to return config entities or
 *   view executables.
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 * @param $reset
 *   If TRUE, reset the static cache forcing views to be reloaded.
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 *
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 */
function views_get_all_views($reset = FALSE) {
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  return entity_get_controller('view')->load();
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}

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