FilterPluginBase.php

<?php

/**
 * @file
 * Contains \Drupal\views\Plugin\views\filter\FilterPluginBase.
 */

namespace Drupal\views\Plugin\views\filter;

use Drupal\Core\Form\FormHelper;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element;
use Drupal\views\Plugin\CacheablePluginInterface;
use Drupal\views\Plugin\views\HandlerBase;
use Drupal\Component\Utility\String as UtilityString;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\views\ViewExecutable;

/**
 * @defgroup views_filter_handlers Views filter handler plugins
 * @{
 * Plugins that handle views filtering.
 *
 * Filter handler plugins extend
 * \Drupal\views\Plugin\views\filter\FilterPluginBase. They must be annotated
 * with \Drupal\views\Annotation\ViewsFilter annotation, and they must be in
 * namespace directory Plugin\views\filter.
 *
 * The following items can go into a hook_views_data() implementation in a
 * filter section to affect how the filter handler will behave:
 * - allow empty: If true, the 'IS NULL' and 'IS NOT NULL' operators become
 *   available as standard operators.
 *
 * You can refine the behavior of filters by setting the following Boolean
 * member variables to TRUE in your plugin class:
 * - $alwaysMultiple: Disable the possibility of forcing a single value.
 * - $no_operator: Disable the possibility of using operators.
 * - $always_required: Disable the possibility of allowing an exposed input to
 *   be optional.
 *
 * @ingroup views_plugins
 * @see plugin_api
 */

/**
 * Base class for Views filters handler plugins.
 */
abstract class FilterPluginBase extends HandlerBase implements CacheablePluginInterface {

  /**
   * Contains the actual value of the field,either configured in the views ui
   * or entered in the exposed filters.
   */
  var $value = NULL;

  /**
   * Contains the operator which is used on the query.
   */
  var $operator = '=';

  /**
   * Contains the information of the selected item in a gruped filter.
   */
  var $group_info = NULL;

  /**
   * @var bool
   * Disable the possibility to force a single value.
   */
  protected $alwaysMultiple = FALSE;

  /**
   * @var bool
   * Disable the possibility to use operators.
   */
  var $no_operator = FALSE;

  /**
   * @var bool
   * Disable the possibility to allow a exposed input to be optional.
   */
  var $always_required = FALSE;

  /**
   * Overrides \Drupal\views\Plugin\views\HandlerBase::init().
   *
   * Provide some extra help to get the operator/value easier to use.
   *
   * This likely has to be overridden by filters which are more complex
   * than simple operator/value.
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);

    $this->operator = $this->options['operator'];
    $this->value = $this->options['value'];
    $this->group_info = $this->options['group_info']['default_group'];

    // Set the default value of the operator ID.
    if (!empty($options['exposed']) && !empty($options['expose']['operator']) && !isset($options['expose']['operator_id'])) {
      $this->options['expose']['operator_id'] = $options['expose']['operator'];
    }

    if ($this->multipleExposedInput()) {
      $this->group_info = array_filter($options['group_info']['default_group_multiple']);
      $this->options['expose']['multiple'] = TRUE;
    }


    // If there are relationships in the view, allow empty should be true
    // so that we can do IS NULL checks on items. Not all filters respect
    // allow empty, but string and numeric do and that covers enough.
    if ($this->view->display_handler->getOption('relationships')) {
      $this->definition['allow empty'] = TRUE;
    }
  }

  protected function defineOptions() {
    $options = parent::defineOptions();

    $options['operator'] = array('default' => '=');
    $options['value'] = array('default' => '');
    $options['group'] = array('default' => '1');
    $options['exposed'] = array('default' => FALSE);
    $options['expose'] = array(
      'contains' => array(
        'operator_id' => array('default' => FALSE),
        'label' => array('default' => ''),
        'description' => array('default' => ''),
        'use_operator' => array('default' => FALSE),
        'operator' => array('default' => ''),
        'identifier' => array('default' => ''),
        'required' => array('default' => FALSE),
        'remember' => array('default' => FALSE),
        'multiple' => array('default' => FALSE),
        'remember_roles' => array('default' => array(
          DRUPAL_AUTHENTICATED_RID => DRUPAL_AUTHENTICATED_RID,
        )),
      ),
    );

    // A group is a combination of a filter, an operator and a value
    // operating like a single filter.
    // Users can choose from a select box which group they want to apply.
    // Views will filter the view according to the defined values.
    // Because it acts as a standard filter, we have to define
    // an identifier and other settings like the widget and the label.
    // This settings are saved in another array to allow users to switch
    // between a normal filter and a group of filters with a single click.
    $options['is_grouped'] = array('default' => FALSE);
    $options['group_info'] = array(
      'contains' => array(
        'label' => array('default' => ''),
        'description' => array('default' => ''),
        'identifier' => array('default' => ''),
        'optional' => array('default' => TRUE),
        'widget' => array('default' => 'select'),
        'multiple' => array('default' => FALSE),
        'remember' => array('default' => 0),
        'default_group' => array('default' => 'All'),
        'default_group_multiple' => array('default' => array()),
        'group_items' => array('default' => array()),
      ),
    );

    return $options;
  }

  /**
   * Display the filter on the administrative summary
   */
  public function adminSummary() {
    return UtilityString::checkPlain((string) $this->operator) . ' ' . UtilityString::checkPlain((string) $this->value);
  }

  /**
   * Determine if a filter can be exposed.
   */
  public function canExpose() { return TRUE; }

  /**
   * Determine if a filter can be converted into a group.
   * Only exposed filters with operators available can be converted into groups.
   */
  protected function canBuildGroup() {
    return $this->isExposed() && (count($this->operatorOptions()) > 0);
  }

  /**
   * Returns TRUE if the exposed filter works like a grouped filter.
   */
  public function isAGroup() {
    return $this->isExposed() && !empty($this->options['is_grouped']);
  }

  /**
   * Provide the basic form which calls through to subforms.
   * If overridden, it is best to call through to the parent,
   * or to at least make sure all of the functions in this form
   * are called.
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    parent::buildOptionsForm($form, $form_state);
    if ($this->canExpose()) {
      $this->showExposeButton($form, $form_state);
    }
    if ($this->canBuildGroup()) {
      $this->showBuildGroupButton($form, $form_state);
    }
    $form['clear_markup_start'] = array(
      '#markup' => '<div class="clearfix">',
    );
    if ($this->isAGroup()) {
      if ($this->canBuildGroup()) {
        $form['clear_markup_start'] = array(
          '#markup' => '<div class="clearfix">',
        );
        // Render the build group form.
        $this->showBuildGroupForm($form, $form_state);
        $form['clear_markup_end'] = array(
          '#markup' => '</div>',
        );
      }
    }
    else {
      // Add the subform from operatorForm().
      $this->showOperatorForm($form, $form_state);
      // Add the subform from valueForm().
      $this->showValueForm($form, $form_state);
      $form['clear_markup_end'] = array(
        '#markup' => '</div>',
      );
      if ($this->canExpose()) {
        // Add the subform from buildExposeForm().
        $this->showExposeForm($form, $form_state);
      }
    }
  }

  /**
   * Simple validate handler
   */
  public function validateOptionsForm(&$form, FormStateInterface $form_state) {
    $this->operatorValidate($form, $form_state);
    $this->valueValidate($form, $form_state);
    if (!empty($this->options['exposed']) && !$this->isAGroup()) {
      $this->validateExposeForm($form, $form_state);
    }
    if ($this->isAGroup()) {
      $this->buildGroupValidate($form, $form_state);
    }
  }

  /**
   * Simple submit handler
   */
  public function submitOptionsForm(&$form, FormStateInterface $form_state) {
    // Do not store these values.
    $form_state->unsetValue('expose_button');
    $form_state->unsetValue('group_button');

    if (!$this->isAGroup()) {
      $this->operatorSubmit($form, $form_state);
      $this->valueSubmit($form, $form_state);
    }
    if (!empty($this->options['exposed'])) {
      $this->submitExposeForm($form, $form_state);
    }
    if ($this->isAGroup()) {
      $this->buildGroupSubmit($form, $form_state);
    }
  }

  /**
   * Shortcut to display the operator form.
   */
  public function showOperatorForm(&$form, FormStateInterface $form_state) {
    $this->operatorForm($form, $form_state);
    $form['operator']['#prefix'] = '<div class="views-group-box views-left-30">';
    $form['operator']['#suffix'] = '</div>';
  }

  /**
   * Options form subform for setting the operator.
   *
   * This may be overridden by child classes, and it must
   * define $form['operator'];
   *
   * @see buildOptionsForm()
   */
  protected function operatorForm(&$form, FormStateInterface $form_state) {
    $options = $this->operatorOptions();
    if (!empty($options)) {
      $form['operator'] = array(
        '#type' => count($options) < 10 ? 'radios' : 'select',
        '#title' => $this->t('Operator'),
        '#default_value' => $this->operator,
        '#options' => $options,
      );
    }
  }

  /**
   * Provide a list of options for the default operator form.
   * Should be overridden by classes that don't override operatorForm
   */
  public function operatorOptions() { return array(); }

  /**
   * Validate the operator form.
   */
  protected function operatorValidate($form, FormStateInterface $form_state) { }

  /**
   * Perform any necessary changes to the form values prior to storage.
   * There is no need for this function to actually store the data.
   */
  public function operatorSubmit($form, FormStateInterface $form_state) { }

  /**
   * Shortcut to display the value form.
   */
  protected function showValueForm(&$form, FormStateInterface $form_state) {
    $this->valueForm($form, $form_state);
    if (empty($this->no_operator)) {
      $form['value']['#prefix'] = '<div class="views-group-box views-right-70">' . (isset($form['value']['#prefix']) ? $form['value']['#prefix'] : '');
      $form['value']['#suffix'] = (isset($form['value']['#suffix']) ? $form['value']['#suffix'] : '') . '</div>';
    }
  }

  /**
   * Options form subform for setting options.
   *
   * This should be overridden by all child classes and it must
   * define $form['value']
   *
   * @see buildOptionsForm()
   */
  protected function valueForm(&$form, FormStateInterface $form_state) {
    $form['value'] = array();
  }

  /**
   * Validate the options form.
   */
  protected function valueValidate($form, FormStateInterface $form_state) { }

  /**
   * Perform any necessary changes to the form values prior to storage.
   * There is no need for this function to actually store the data.
   */
  protected function valueSubmit($form, FormStateInterface $form_state) { }

  /**
   * Shortcut to display the exposed options form.
   */
  public function showBuildGroupForm(&$form, FormStateInterface $form_state) {
    if (empty($this->options['is_grouped'])) {
      return;
    }

    $this->buildExposedFiltersGroupForm($form, $form_state);

    // When we click the expose button, we add new gadgets to the form but they
    // have no data in POST so their defaults get wiped out. This prevents
    // these defaults from getting wiped out. This setting will only be TRUE
    // during a 2nd pass rerender.
    if ($form_state->get('force_build_group_options')) {
      foreach (Element::children($form['group_info']) as $id) {
        if (isset($form['group_info'][$id]['#default_value']) && !isset($form['group_info'][$id]['#value'])) {
          $form['group_info'][$id]['#value'] = $form['group_info'][$id]['#default_value'];
        }
      }
    }
  }

  /**
   * Shortcut to display the build_group/hide button.
   */
  protected function showBuildGroupButton(&$form, FormStateInterface $form_state) {

    $form['group_button'] = array(
      '#prefix' => '<div class="views-grouped clearfix">',
      '#suffix' => '</div>',
      // Should always come after the description and the relationship.
      '#weight' => -190,
    );

    $grouped_description = $this->t('Grouped filters allow a choice between predefined operator|value pairs.');
    $form['group_button']['radios'] = array(
      '#theme_wrappers' => array('container'),
      '#attributes' => array('class' => array('js-only')),
    );
    $form['group_button']['radios']['radios'] = array(
      '#title' => $this->t('Filter type to expose'),
      '#description' => $grouped_description,
      '#type' => 'radios',
      '#options' => array(
        $this->t('Single filter'),
        $this->t('Grouped filters'),
      ),
    );

    if (empty($this->options['is_grouped'])) {
      $form['group_button']['markup'] = array(
        '#markup' => '<div class="description grouped-description">' . $grouped_description . '</div>',
      );
      $form['group_button']['button'] = array(
        '#limit_validation_errors' => array(),
        '#type' => 'submit',
        '#value' => $this->t('Grouped filters'),
        '#submit' => array(array($this, 'buildGroupForm')),
        '#attributes' => array('class' => array('use-ajax-submit')),
      );
      $form['group_button']['radios']['radios']['#default_value'] = 0;
    }
    else {
      $form['group_button']['button'] = array(
        '#limit_validation_errors' => array(),
        '#type' => 'submit',
        '#value' => $this->t('Single filter'),
        '#submit' => array(array($this, 'buildGroupForm')),
        '#attributes' => array('class' => array('use-ajax-submit')),
      );
      $form['group_button']['radios']['radios']['#default_value'] = 1;
    }
  }

  /**
   * Displays the Build Group form.
   */
  public function buildGroupForm($form, FormStateInterface $form_state) {
    $item = &$this->options;
    // flip. If the filter was a group, set back to a standard filter.
    $item['is_grouped'] = empty($item['is_grouped']);

    // If necessary, set new defaults:
    if ($item['is_grouped']) {
      $this->buildGroupOptions();
    }

    $view = $form_state->get('view');
    $display_id = $form_state->get('display_id');
    $type = $form_state->get('type');
    $id = $form_state->get('id');
    $view->getExecutable()->setHandler($display_id, $type, $id, $item);

    $view->addFormToStack($form_state->get('form_key'), $display_id, $type, $id, TRUE, TRUE);

    $view->cacheSet();
    $form_state->set('rerender', TRUE);
    $form_state->setRebuild();
    $form_state->get('force_build_group_options', TRUE);
  }

  /**
   * Shortcut to display the expose/hide button.
   */
  public function showExposeButton(&$form, FormStateInterface $form_state) {
    $form['expose_button'] = array(
      '#prefix' => '<div class="views-expose clearfix">',
      '#suffix' => '</div>',
      // Should always come after the description and the relationship.
      '#weight' => -200,
    );

    // Add a checkbox for JS users, which will have behavior attached to it
    // so it can replace the button.
    $form['expose_button']['checkbox'] = array(
      '#theme_wrappers' => array('container'),
      '#attributes' => array('class' => array('js-only')),
    );
    $form['expose_button']['checkbox']['checkbox'] = array(
      '#title' => $this->t('Expose this filter to visitors, to allow them to change it'),
      '#type' => 'checkbox',
    );

    // Then add the button itself.
    if (empty($this->options['exposed'])) {
      $form['expose_button']['markup'] = array(
        '#markup' => '<div class="description exposed-description">' . $this->t('This filter is not exposed. Expose it to allow the users to change it.') . '</div>',
      );
      $form['expose_button']['button'] = array(
        '#limit_validation_errors' => array(),
        '#type' => 'submit',
        '#value' => $this->t('Expose filter'),
        '#submit' => array(array($this, 'displayExposedForm')),
        '#attributes' => array('class' => array('use-ajax-submit')),
      );
      $form['expose_button']['checkbox']['checkbox']['#default_value'] = 0;
    }
    else {
      $form['expose_button']['markup'] = array(
        '#markup' => '<div class="description exposed-description">' . $this->t('This filter is exposed. If you hide it, users will not be able to change it.') . '</div>',
      );
      $form['expose_button']['button'] = array(
        '#limit_validation_errors' => array(),
        '#type' => 'submit',
        '#value' => $this->t('Hide filter'),
        '#submit' => array(array($this, 'displayExposedForm')),
        '#attributes' => array('class' => array('use-ajax-submit')),
      );
      $form['expose_button']['checkbox']['checkbox']['#default_value'] = 1;
    }
  }

  /**
   * Options form subform for exposed filter options.
   *
   * @see buildOptionsForm()
   */
  public function buildExposeForm(&$form, FormStateInterface $form_state) {
    $form['#theme'] = 'views_ui_expose_filter_form';
    // #flatten will move everything from $form['expose'][$key] to $form[$key]
    // prior to rendering. That's why the preRender for it needs to run first,
    // so that when the next preRender (the one for fieldsets) runs, it gets
    // the flattened data.
    array_unshift($form['#pre_render'], array(get_class($this), 'preRenderFlattenData'));
    $form['expose']['#flatten'] = TRUE;

    if (empty($this->always_required)) {
      $form['expose']['required'] = array(
        '#type' => 'checkbox',
        '#title' => $this->t('Required'),
        '#default_value' => $this->options['expose']['required'],
      );
    }
    else {
      $form['expose']['required'] = array(
        '#type' => 'value',
        '#value' => TRUE,
      );
    }
    $form['expose']['label'] = array(
      '#type' => 'textfield',
      '#default_value' => $this->options['expose']['label'],
      '#title' => $this->t('Label'),
      '#size' => 40,
    );

    $form['expose']['description'] = array(
      '#type' => 'textfield',
      '#default_value' => $this->options['expose']['description'],
      '#title' => $this->t('Description'),
      '#size' => 60,
    );

    if (!empty($form['operator']['#type'])) {
       // Increase the width of the left (operator) column.
      $form['operator']['#prefix'] = '<div class="views-group-box views-left-40">';
      $form['operator']['#suffix'] = '</div>';
      $form['value']['#prefix'] = '<div class="views-group-box views-right-60">';
      $form['value']['#suffix'] = '</div>';

      $form['expose']['use_operator'] = array(
        '#type' => 'checkbox',
        '#title' => $this->t('Expose operator'),
        '#description' => $this->t('Allow the user to choose the operator.'),
        '#default_value' => !empty($this->options['expose']['use_operator']),
      );
      $form['expose']['operator_id'] = array(
        '#type' => 'textfield',
        '#default_value' => $this->options['expose']['operator_id'],
        '#title' => $this->t('Operator identifier'),
        '#size' => 40,
        '#description' => $this->t('This will appear in the URL after the ? to identify this operator.'),
        '#states' => array(
          'visible' => array(
            ':input[name="options[expose][use_operator]"]' => array('checked' => TRUE),
          ),
        ),
      );
    }
    else {
      $form['expose']['operator_id'] = array(
        '#type' => 'value',
        '#value' => '',
      );
    }

    if (empty($this->alwaysMultiple)) {
      $form['expose']['multiple'] = array(
        '#type' => 'checkbox',
        '#title' => $this->t('Allow multiple selections'),
        '#description' => $this->t('Enable to allow users to select multiple items.'),
        '#default_value' => $this->options['expose']['multiple'],
      );
    }
    $form['expose']['remember'] = array(
      '#type' => 'checkbox',
      '#title' => $this->t('Remember the last selection'),
      '#description' => $this->t('Enable to remember the last selection made by the user.'),
      '#default_value' => $this->options['expose']['remember'],
    );

    $role_options = array_map('\Drupal\Component\Utility\String::checkPlain', user_role_names());
    $form['expose']['remember_roles'] = array(
      '#type' => 'checkboxes',
      '#title' => $this->t('User roles'),
      '#description' => $this->t('Remember exposed selection only for the selected user role(s). If you select no roles, the exposed data will never be stored.'),
      '#default_value' => $this->options['expose']['remember_roles'],
      '#options' => $role_options,
      '#states' => array(
        'invisible' => array(
          ':input[name="options[expose][remember]"]' => array('checked' => FALSE),
        ),
      ),
    );

    $form['expose']['identifier'] = array(
      '#type' => 'textfield',
      '#default_value' => $this->options['expose']['identifier'],
      '#title' => $this->t('Filter identifier'),
      '#size' => 40,
      '#description' => $this->t('This will appear in the URL after the ? to identify this filter. Cannot be blank.'),
    );
  }

  /**
   * Validate the options form.
   */
  public function validateExposeForm($form, FormStateInterface $form_state) {
    $identifier = $form_state->getValue(array('options', 'expose', 'identifier'));
    if (empty($identifier)) {
      $form_state->setError($form['expose']['identifier'], $this->t('The identifier is required if the filter is exposed.'));
    }
    elseif ($identifier == 'value') {
      $form_state->setError($form['expose']['identifier'], $this->t('This identifier is not allowed.'));
    }

    if (!$this->view->display_handler->isIdentifierUnique($form_state->get('id'), $identifier)) {
      $form_state->setError($form['expose']['identifier'], $this->t('This identifier is used by another handler.'));
    }
  }

  /**
   * Validate the build group options form.
   */
  protected function buildGroupValidate($form, FormStateInterface $form_state) {
    if (!$form_state->isValueEmpty(array('options', 'group_info'))) {
      $identifier = $form_state->getValue(array('options', 'group_info', 'identifier'));
      if (empty($identifier)) {
        $form_state->setError($form['group_info']['identifier'], $this->t('The identifier is required if the filter is exposed.'));
      }

      elseif ($identifier == 'value') {
        $form_state->setError($form['group_info']['identifier'], $this->t('This identifier is not allowed.'));
      }

      if (!$this->view->display_handler->isIdentifierUnique($form_state->get('id'), $identifier)) {
        $form_state->setError($form['group_info']['identifier'], $this->t('This identifier is used by another handler.'));
      }
    }

    if ($group_items = $form_state->getValue(array('options', 'group_info', 'group_items'))) {
      $operators = $this->operators();

      foreach ($group_items as $id => $group) {
        if (empty($group['remove'])) {

          // Check if the title is defined but value wasn't defined.
          if (!empty($group['title']) && $operators[$group['operator']]['values'] > 0) {
            if ((!is_array($group['value']) && trim($group['value']) == "") ||
                (is_array($group['value']) && count(array_filter($group['value'], 'static::arrayFilterZero')) == 0)) {
              $form_state->setError($form['group_info']['group_items'][$id]['value'], $this->t('The value is required if title for this item is defined.'));
            }
          }

          // Check if the value is defined but title wasn't defined.
          if ((!is_array($group['value']) && trim($group['value']) != "") ||
              (is_array($group['value']) && count(array_filter($group['value'], 'static::arrayFilterZero')) > 0)) {
            if (empty($group['title'])) {
              $form_state->setError($form['group_info']['group_items'][$id]['title'], $this->t('The title is required if value for this item is defined.'));
            }
          }
        }
      }
    }
  }

  /**
   * Save new group items, re-enumerates and remove groups marked to delete.
   */
  protected function buildGroupSubmit($form, FormStateInterface $form_state) {
    $groups = array();
    $group_items = $form_state->getValue(array('options', 'group_info', 'group_items'));
    uasort($group_items, array('Drupal\Component\Utility\SortArray', 'sortByWeightElement'));
    // Filter out removed items.

    // Start from 1 to avoid problems with #default_value in the widget.
    $new_id = 1;
    $new_default = 'All';
    foreach ($group_items as $id => $group) {
      if (empty($group['remove'])) {
        // Don't store this.
        unset($group['remove']);
        unset($group['weight']);
        $groups[$new_id] = $group;

        if ($form_state->getValue(array('options', 'group_info', 'default_group')) == $id) {
          $new_default = $new_id;
        }
      }
      $new_id++;
    }
    if ($new_default != 'All') {
      $form_state->setValue(array('options', 'group_info', 'default_group'), $new_default);
    }
    $filter_default_multiple = $form_state->getValue(array('options', 'group_info', 'default_group_multiple'));
    $form_state->setValue(array('options', 'group_info', 'default_group_multiple'), array_filter($filter_default_multiple));

    $form_state->setValue(array('options', 'group_info', 'group_items'), $groups);
  }

  /**
   * Provide default options for exposed filters.
   */
  public function defaultExposeOptions() {
    $this->options['expose'] = array(
      'use_operator' => FALSE,
      'operator' => $this->options['id'] . '_op',
      'identifier' => $this->options['id'],
      'label' => $this->definition['title'],
      'description' => NULL,
      'remember' => FALSE,
      'multiple' => FALSE,
      'required' => FALSE,
    );
  }

  /**
   * Provide default options for exposed filters.
   */
  protected function buildGroupOptions() {
    $this->options['group_info'] = array(
      'label' => $this->definition['title'],
      'description' => NULL,
      'identifier' => $this->options['id'],
      'optional' => TRUE,
      'widget' => 'select',
      'multiple' => FALSE,
      'remember' => FALSE,
      'default_group' => 'All',
      'default_group_multiple' => array(),
      'group_items' => array(),
    );
  }

  /**
   * Build a form containing a group of operator | values to apply as a
   * single filter.
   */
  public function groupForm(&$form, FormStateInterface $form_state) {
    if (!empty($this->options['group_info']['optional']) && !$this->multipleExposedInput()) {
      $groups = array('All' => $this->t('- Any -'));
    }
    foreach ($this->options['group_info']['group_items'] as $id => $group) {
      if (!empty($group['title'])) {
        $groups[$id] = $id != 'All' ? $this->t($group['title']) : $group['title'];
      }
    }

    if (count($groups)) {
      $value = $this->options['group_info']['identifier'];

      $form[$value] = array(
        '#title' => UtilityString::checkPlain($this->options['group_info']['label']),
        '#type' => $this->options['group_info']['widget'],
        '#default_value' => $this->group_info,
        '#options' => $groups,
      );
      if (!empty($this->options['group_info']['multiple'])) {
        if (count($groups) < 5) {
          $form[$value]['#type'] = 'checkboxes';
        }
        else {
          $form[$value]['#type'] = 'select';
          $form[$value]['#size'] = 5;
          $form[$value]['#multiple'] = TRUE;
        }
        unset($form[$value]['#default_value']);
        $user_input = $form_state->getUserInput();
        if (empty($user_input)) {
          $user_input[$value] = $this->group_info;
          $form_state->setUserInput($user_input);
        }
      }

      $this->options['expose']['label'] = '';
    }
  }


  /**
   * Render our chunk of the exposed filter form when selecting
   *
   * You can override this if it doesn't do what you expect.
   */
  public function buildExposedForm(&$form, FormStateInterface $form_state) {
    if (empty($this->options['exposed'])) {
      return;
    }

    // Build the exposed form, when its based on an operator.
    if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id'])) {
      $operator = $this->options['expose']['operator_id'];
      $this->operatorForm($form, $form_state);
      $form[$operator] = $form['operator'];

      $this->exposedTranslate($form[$operator], 'operator');

      unset($form['operator']);
    }

    // Build the form and set the value based on the identifier.
    if (!empty($this->options['expose']['identifier'])) {
      $value = $this->options['expose']['identifier'];
      $this->valueForm($form, $form_state);
      $form[$value] = $form['value'];

      if (isset($form[$value]['#title']) && !empty($form[$value]['#type']) && $form[$value]['#type'] != 'checkbox') {
        unset($form[$value]['#title']);
      }

      $this->exposedTranslate($form[$value], 'value');

      if (!empty($form['#type']) && ($form['#type'] == 'checkboxes' || ($form['#type'] == 'select' && !empty($form['#multiple'])))) {
        unset($form[$value]['#default_value']);
      }

      if (!empty($form['#type']) && $form['#type'] == 'select' && empty($form['#multiple'])) {
        $form[$value]['#default_value'] = 'All';
      }

      if ($value != 'value') {
        unset($form['value']);
      }
    }
  }

  /**
   * Build the form to let users create the group of exposed filters.
   * This form is displayed when users click on button 'Build group'
   */
  protected function buildExposedFiltersGroupForm(&$form, FormStateInterface $form_state) {
    if (empty($this->options['exposed']) || empty($this->options['is_grouped'])) {
      return;
    }
    $form['#theme'] = 'views_ui_build_group_filter_form';

    // #flatten will move everything from $form['group_info'][$key] to $form[$key]
    // prior to rendering. That's why the preRender for it needs to run first,
    // so that when the next preRender (the one for fieldsets) runs, it gets
    // the flattened data.
    array_unshift($form['#pre_render'], array(get_class($this), 'preRenderFlattenData'));
    $form['group_info']['#flatten'] = TRUE;

    if (!empty($this->options['group_info']['identifier'])) {
      $identifier = $this->options['group_info']['identifier'];
    }
    else {
      $identifier = 'group_' . $this->options['expose']['identifier'];
    }
    $form['group_info']['identifier'] = array(
      '#type' => 'textfield',
      '#default_value' => $identifier,
      '#title' => $this->t('Filter identifier'),
      '#size' => 40,
      '#description' => $this->t('This will appear in the URL after the ? to identify this filter. Cannot be blank.'),
    );
    $form['group_info']['label'] = array(
      '#type' => 'textfield',
      '#default_value' => $this->options['group_info']['label'],
      '#title' => $this->t('Label'),
      '#size' => 40,
    );
    $form['group_info']['description'] = array(
      '#type' => 'textfield',
      '#default_value' => $this->options['group_info']['description'],
      '#title' => $this->t('Description'),
      '#size' => 60,
    );
    $form['group_info']['optional'] = array(
      '#type' => 'checkbox',
      '#title' => $this->t('Optional'),
      '#description' => $this->t('This exposed filter is optional and will have added options to allow it not to be set.'),
      '#default_value' => $this->options['group_info']['optional'],
    );
    $form['group_info']['multiple'] = array(
      '#type' => 'checkbox',
      '#title' => $this->t('Allow multiple selections'),
      '#description' => $this->t('Enable to allow users to select multiple items.'),
      '#default_value' => $this->options['group_info']['multiple'],
    );
    $form['group_info']['widget'] = array(
      '#type' => 'radios',
      '#default_value' => $this->options['group_info']['widget'],
      '#title' => $this->t('Widget type'),
      '#options' => array(
        'radios' => $this->t('Radios'),
        'select' => $this->t('Select'),
      ),
      '#description' => $this->t('Select which kind of widget will be used to render the group of filters'),
    );
    $form['group_info']['remember'] = array(
      '#type' => 'checkbox',
      '#title' => $this->t('Remember'),
      '#description' => $this->t('Remember the last setting the user gave this filter.'),
      '#default_value' => $this->options['group_info']['remember'],
    );

    if (!empty($this->options['group_info']['identifier'])) {
      $identifier = $this->options['group_info']['identifier'];
    }
    else {
      $identifier = 'group_' . $this->options['expose']['identifier'];
    }
    $form['group_info']['identifier'] = array(
      '#type' => 'textfield',
      '#default_value' => $identifier,
      '#title' => $this->t('Filter identifier'),
      '#size' => 40,
      '#description' => $this->t('This will appear in the URL after the ? to identify this filter. Cannot be blank.'),
    );
    $form['group_info']['label'] = array(
      '#type' => 'textfield',
      '#default_value' => $this->options['group_info']['label'],
      '#title' => $this->t('Label'),
      '#size' => 40,
    );
    $form['group_info']['optional'] = array(
      '#type' => 'checkbox',
      '#title' => $this->t('Optional'),
      '#description' => $this->t('This exposed filter is optional and will have added options to allow it not to be set.'),
      '#default_value' => $this->options['group_info']['optional'],
    );
    $form['group_info']['widget'] = array(
      '#type' => 'radios',
      '#default_value' => $this->options['group_info']['widget'],
      '#title' => $this->t('Widget type'),
      '#options' => array(
        'radios' => $this->t('Radios'),
        'select' => $this->t('Select'),
      ),
      '#description' => $this->t('Select which kind of widget will be used to render the group of filters'),
    );
    $form['group_info']['remember'] = array(
      '#type' => 'checkbox',
      '#title' => $this->t('Remember'),
      '#description' => $this->t('Remember the last setting the user gave this filter.'),
      '#default_value' => $this->options['group_info']['remember'],
    );

    $groups = array('All' => $this->t('- Any -')); // The string '- Any -' will not be rendered see @theme_views_ui_build_group_filter_form

    // Provide 3 options to start when we are in a new group.
    if (count($this->options['group_info']['group_items']) == 0) {
      $this->options['group_info']['group_items'] = array_fill(1, 3, array());
    }

    // After the general settings, comes a table with all the existent groups.
    $default_weight = 0;
    foreach ($this->options['group_info']['group_items'] as $item_id => $item) {
      if (!$form_state->isValueEmpty(array('options', 'group_info', 'group_items', $item_id, 'remove'))) {
        continue;
      }
      // Each rows contains three widgets:
      // a) The title, where users define how they identify a pair of operator | value
      // b) The operator
      // c) The value (or values) to use in the filter with the selected operator

      // In each row, we have to display the operator form and the value from
      // $row acts as a fake form to render each widget in a row.
      $row = array();
      $groups[$item_id] = $this->t('Grouping @id', array('@id' => $item_id));
      $this->operatorForm($row, $form_state);
      // Force the operator form to be a select box. Some handlers uses
      // radios and they occupy a lot of space in a table row.
      $row['operator']['#type'] = 'select';
      $row['operator']['#title'] = '';
      $this->valueForm($row, $form_state);

      // Fix the dependencies to update value forms when operators changes. This
      // is needed because forms are inside a new form and their IDs changes.
      // Dependencies are used when operator changes from to 'Between',
      // 'Not Between', etc, and two or more widgets are displayed.
      FormHelper::rewriteStatesSelector($row['value'], ':input[name="options[operator]"]', ':input[name="options[group_info][group_items][' . $item_id . '][operator]"]');

      // Set default values.
      $children = Element::children($row['value']);
      if (!empty($children)) {
        foreach ($children as $child) {
          foreach ($row['value'][$child]['#states']['visible'] as $state) {
            if (isset($state[':input[name="options[group_info][group_items][' . $item_id . '][operator]"]'])) {
              $row['value'][$child]['#title'] = '';

              if (!empty($this->options['group_info']['group_items'][$item_id]['value'][$child])) {
                $row['value'][$child]['#default_value'] = $this->options['group_info']['group_items'][$item_id]['value'][$child];
              }
              // Exit this loop and process the next child element.