field_group.module

<?php

/**
 * @file
 * Fieldgroup module.
 *
 * For an overview of all php and javascript hooks, see field_group.api.php.
 *
 */

require_once 'field_group.groups.inc';

/**
 * Implements hook_config_info().
 */
function field_group_config_info() {
  $prefixes['field_group.field_group'] = array(
    'name_key' => array('entity_type', 'bundle', 'mode', 'group_name'),
    'label_callback' => 'field_group_config_label',
    'group' => t('Field groups'),
  );
  return $prefixes;
}

/**
 * Given a bundle config file, display a unique label.
 */
function field_group_config_label($config, $config_name) {
  list($entity_type_name, $bundle, $mode, $group_name) = explode('.', str_replace('field_group.field_group.', '', $config_name));
  $entity_type = entity_get_info($entity_type_name);
  $entity_label = $entity_type['label'];
  $bundle_label = isset($entity_type['bundles'][$bundle]['label']) ? $entity_type['bundles'][$bundle]['label'] : $bundle;

  return $entity_label . ' - ' . $bundle_label . ' - Mode: ' . $mode . ' - ' . $group_name;
}

/**
 * Implements hook_menu().
 */
function field_group_menu() {
  $items = array();

  // Ensure the following is not executed until field_bundles is working and
  // tables are updated. Needed to avoid errors on initial installation.
  if (defined('MAINTENANCE_MODE')) {
    return $items;
  }

  // Create tabs for all possible bundles.
  foreach (entity_get_info() as $entity_type => $entity_info) {
    if (isset($entity_info['fieldable']) && $entity_info['fieldable']) {
      foreach ($entity_info['bundles'] as $bundle_name => $bundle_info) {
        if (isset($bundle_info['admin'])) {
          // Extract path information from the bundle.
          $path = $bundle_info['admin']['path'];
          // Different bundles can appear on the same path (e.g. %node_type and
          // %comment_node_type). To allow field_group_menu_load() to extract the
          // actual bundle object from the translated menu router path
          // arguments, we need to identify the argument position of the bundle
          // name string ('bundle argument') and pass that position to the menu
          // loader. The position needs to be casted into a string; otherwise it
          // would be replaced with the bundle name string.
          if (isset($bundle_info['admin']['bundle argument'])) {
            $bundle_arg = $bundle_info['admin']['bundle argument'];
            $bundle_pos = (string) $bundle_arg;

          }
          else {
            $bundle_arg = $bundle_name;
            $bundle_pos = '0';
          }

          // This is the position of the %field_group_menu placeholder in the
          // items below.
          $group_position = count(explode('/', $path)) + 1;

          // Extract access information, providing defaults.
          $access = array_intersect_key($bundle_info['admin'], backdrop_map_assoc(array('access callback', 'access arguments')));
          $access += array(
            'access callback' => 'user_access',
            'access arguments' => array('administer site configuration'),
          );

          $items["$path/groups/%field_group_menu/delete"] = array(
            'load arguments' => array($entity_type, $bundle_arg, $bundle_pos, '%map'),
            'title' => 'Delete',
            'page callback' => 'backdrop_get_form',
            'page arguments' => array('field_group_delete_form', $group_position),
            'type' => MENU_CALLBACK,
            'file' => 'field_group.field_ui.inc',
          ) + $access;

          $items["$path/groups/%field_group_menu/enable"] = array(
            'load arguments' => array($entity_type, $bundle_arg, $bundle_pos, '%map'),
            'title' => 'Enable',
            'page callback' => 'backdrop_get_form',
            'page arguments' => array('field_group_enable_form', $group_position),
            'type' => MENU_CALLBACK,
            'file' => 'field_group.field_ui.inc',
          ) + $access;

        }
      }
    }
  }

  return $items;
}

/**
 * Implements hook_permission().
 */
function field_group_permission() {
  return array(
    'administer fieldgroups' => array(
      'title' => t('Administer fieldgroups'),
      'description' => t('Display the administration for fieldgroups.'),
    ),
  );
}

/**
 * Menu Wildcard loader function to load group definitions.
 *
 * @param string $group_name
 *   The name of the group, as contained in the path.
 * @param string $entity_type
 *   The name of the entity.
 * @param string $bundle_name
 *   The name of the bundle, as contained in the path.
 * @param int $bundle_pos
 *   The position of $bundle_name in $map.
 * @param array $map
 *   The translated menu router path argument map.
 *
 * @return object
 *   Group definition.
 */
function field_group_menu_load($group_name, $entity_type, $bundle_name, $bundle_pos, $map) {

  if ($bundle_pos > 0) {
    $bundle = $map[$bundle_pos];
    $bundle_name = field_extract_bundle($entity_type, $bundle);
  }

  $args = func_get_args();
  $args_pop = array_pop($args);
  $mode = array_pop($args_pop);

  $group = field_group_load_field_group($group_name, $entity_type, $bundle_name, $mode);
  return empty($group) ? FALSE : $group;
}

/**
 * Loads a group definition.
 *
 * @param string $group_name
 *   The name of the group.
 * @param string $entity_type
 *   The name of the entity.
 * @param string $bundle_name
 *   The name of the bundle.
 * @param string $mode
 *   The view mode to load.
 *
 * @return object
 *   Group definition.
 */
function field_group_load_field_group($group_name, $entity_type, $bundle_name, $mode) {

  $config = config('field_group.field_group.' . $entity_type . '.' . $bundle_name . '.' . $mode . '.' . $group_name);
  $object = (object) $config->get();

  return $object;
}

/**
 * Implements hook_theme_registry_alter().
 */
function field_group_theme_registry_alter(&$theme_registry) {

  // Inject field_group_build_entity_groups in all entity theming functions.
  $entity_info = entity_get_info();
  $entities = array();
  foreach ($entity_info as $entity => $info) {
    if (isset($entity_info[$entity]['fieldable']) && $entity_info[$entity]['fieldable']) {
      // User uses user_profile for theming.
      if ($entity == 'user') $entity = 'user_profile';
      $entities[] = $entity;
    }
  }

  // Support for File Entity.
  if (isset($theme_registry['file_entity'])) {
    $entities[] = 'file_entity';
  }

  // Support for Entity API.
  if (isset($theme_registry['entity'])) {
    $entities[] = 'entity';
  }

  foreach ($entities as $entity) {
    if (isset($theme_registry[$entity])) {
      $theme_registry[$entity]['preprocess functions'][] = 'field_group_build_entity_groups';
      // DS support, make sure it comes after field_group.
      if ($key = array_search('ds_entity_variables', $theme_registry[$entity]['preprocess functions'])) {
        unset($theme_registry[$entity]['preprocess functions'][$key]);
        $theme_registry[$entity]['preprocess functions'][] = 'ds_entity_variables';
      }
    }
  }

}

/**
 * Implements hook_field_attach_delete_bundle().
 */
function field_group_field_attach_delete_bundle($entity_type, $bundle) {

  $list = field_group_read_groups(array('bundle' => $bundle, 'entity_type' => $entity_type));

  // Delete the entity's entry from field_group of all entities.
  if (isset($list[$entity_type], $list[$entity_type][$bundle])) {
    foreach ($list[$entity_type][$bundle] as $group_mode => $groups) {
      foreach ($groups as $group) {
        $config = config('field_group.field_group.' . $entity_type . '.' . $bundle . '.' . $group_mode . '.' . $group->group_name);
        $config->delete();
      }
    }
  }

}

/**
 * Implements hook_field_attach_form().
 */
function field_group_field_attach_form($entity_type, $entity, &$form, &$form_state, $langcode) {

  $form['#attached']['css'][] = backdrop_get_path('module', 'field_group') . '/css/field_group.field_ui.css';
  field_group_attach_groups($form, 'form', $form_state);
  $form['#pre_render'][] = 'field_group_form_pre_render';
}

/**
 * Implements hook_form_FORM_ID_alter().
 * Using hook_form_field_ui_field_overview_form_alter.
 */
function field_group_form_field_ui_field_overview_form_alter(&$form, &$form_state) {
  form_load_include($form_state, 'inc', 'field_group', 'field_group.field_ui');
  field_group_field_ui_overview_form_alter($form, $form_state);
}

/**
 * Implements hook_form_FORM_ID_alter().
 * Using hook_form_field_ui_display_form_alter.
 */
function field_group_form_field_ui_display_form_alter(&$form, &$form_state) {
  form_load_include($form_state, 'inc', 'field_group', 'field_group.field_ui');
  field_group_field_ui_overview_form_alter($form, $form_state, TRUE);
}

/**
 * Implements hook_field_attach_view_alter().
 */
function field_group_field_attach_view_alter(&$element, $context) {
  // Check whether the view mode uses custom display settings or the 'default' mode.
  $actual_mode = 'default';
  if (isset($element['#entity_type']) && isset($element['#bundle'])) {
    $view_mode_settings = field_view_mode_settings($element['#entity_type'], $element['#bundle']);
    $view_mode = $context['view_mode'];
    $actual_mode = (!empty($view_mode_settings[$view_mode]['custom_settings']) ? $view_mode : 'default');
    field_group_attach_groups($element, $actual_mode);
  }
}

/**
 * Implements hook_field_group_format_settings().
 *   If the group has no format settings, default ones will be added.
 */
function field_group_field_group_format_settings($group) {
  // Add a wrapper for extra settings to use by others.
  $form = array(
    'instance_settings' => array(
      '#tree' => TRUE,
      '#weight' => 2,
    ),
  );

  $field_group_types = field_group_formatter_info();
  $mode = $group->mode == 'form' ? 'form' : 'display';
  $formatter = $field_group_types[$mode][$group->format_type];

  // Add the required formatter type selector.
  if (isset($formatter['format_types'])) {
    $form['formatter'] = array(
      '#title' => t('Fieldgroup settings'),
      '#type' => 'select',
      '#options' => backdrop_map_assoc($formatter['format_types']),
      '#default_value' => isset($group->format_settings['formatter']) ? $group->format_settings['formatter'] : $formatter['default_formatter'],
      '#weight' => -4,
    );
  }

  if (isset($formatter['instance_settings']['required_fields']) && $mode == 'form') {
    $form['instance_settings']['required_fields'] = array(
      '#type' => 'checkbox',
      '#title' => t('Mark group as required if it contains required fields.'),
      '#default_value' => isset($group->format_settings['instance_settings']['required_fields']) ? $group->format_settings['instance_settings']['required_fields'] : (isset($formatter['instance_settings']['required_fields']) ? $formatter['instance_settings']['required_fields'] : ''),
      '#weight' => 2,
    );
  }

  if (isset($formatter['instance_settings']['id'])) {
    $form['instance_settings']['id'] = array(
      '#title' => t('ID'),
      '#type' => 'textfield',
      '#default_value' => isset($group->format_settings['instance_settings']['id']) ? $group->format_settings['instance_settings']['id'] : (isset($formatter['instance_settings']['id']) ? $formatter['instance_settings']['id'] : ''),
      '#weight' => 10,
      '#element_validate' => array('field_group_validate_id'),
    );
  }
  if (isset($formatter['instance_settings']['classes'])) {
    $form['instance_settings']['classes'] = array(
      '#title' => t('Extra CSS classes'),
      '#type' => 'textfield',
      '#default_value' => isset($group->format_settings['instance_settings']['classes']) ? $group->format_settings['instance_settings']['classes'] : (isset($formatter['instance_settings']['classes']) ? $formatter['instance_settings']['classes'] : ''),
      '#weight' => 11,
      '#element_validate' => array('field_group_validate_css_class'),
    );
  }

  if (isset($formatter['instance_settings']['description'])) {
    $form['instance_settings']['description'] = array(
      '#title' => t('Description'),
      '#type' => 'textarea',
      '#default_value' => isset($group->format_settings['instance_settings']['description']) ? $group->format_settings['instance_settings']['description'] : (isset($formatter['instance_settings']['description']) ? $formatter['instance_settings']['description'] : ''),
      '#weight' => 0,
    );
  }

  return $form;
}

/**
 * Helper function to prepare basic variables needed for most formatters.
 *
 * Called in field_group_field_group_pre_render(), but can also be called in
 * other implementations of hook_field_group_pre_render().
 *
 * @param object $group
 *   The group object passed by reference.
 */
function field_group_pre_render_prepare(&$group) {

  $classes = _field_group_get_html_classes($group);

  $group->classes = implode(' ', $classes->required);
  $group->description = !empty($group->format_settings['instance_settings']['description']) ? filter_xss_admin(t($group->format_settings['instance_settings']['description'])) : '';

}

/**
 * Implements hook_field_group_pre_render().
 */
function field_group_field_group_pre_render(&$element, &$group, &$form) {

  field_group_pre_render_prepare($group);

  $view_mode = isset($form['#view_mode']) ? $form['#view_mode'] : 'form';

  // Add all field_group format types to the js settings.
  $form['#attached']['js'][] = array(
    'data' => array('field_group' => array($group->format_type => $view_mode)),
    'type' => 'setting',
  );

  if (isset($group->format_settings['instance_settings']['id']) && !empty($group->format_settings['instance_settings']['id'])) {
    $element['#id'] = backdrop_html_id($group->format_settings['instance_settings']['id']);
  }

  $element['#weight'] = $group->weight;

  // Call the pre render function for the format type.
  $function = "field_group_pre_render_" . str_replace("-", "_", $group->format_type);
  if (function_exists($function)) {
    $function($element, $group, $form);
  }

}

/**
 * Remove empty groups on forms.
 *
 * @param string $parent_name
 *   The name of the element.
 * @param array $element
 *   The element to check the empty state.
 * @param array $groups
 *   Array of group objects.
 */
function field_group_remove_empty_form_groups($name, &$element, $groups, &$form_groups, $entity) {

  $children = element_children($element);

  $hasChildren = FALSE;
  if (count($children)) {
    foreach ($children as $childname) {

      if (in_array($childname, $groups, TRUE)) {
        field_group_remove_empty_form_groups($childname, $element[$childname], $groups, $form_groups, $entity);
      }
      $hasChildren = $hasChildren ? TRUE : _field_group_is_empty_element($element, $entity, $childname, $groups);

    }
  }

  if (!$hasChildren) {

    // Remove empty elements from the #groups.
    if (empty($element) && isset($form_groups[$name]) && !is_array($form_groups[$name])) {
      foreach ($form_groups as $group_name => $group) {
        if (isset($group->children)) {
          $group_children = array_flip($group->children);
          if (isset($group_children[$name])) {
            unset($form_groups[$group_name]->children[$group_children[$name]]);
          }
        }
      }
    }

    $element['#access'] = FALSE;

  }

}

/**
 * Determine if an element has non-empty children.
 *
 * @param array $element
 *   The element to check.
 * @param string $entity
 *   The entity type name.
 * @param string $childname
 *   The name of the child element.
 * @param array $groups
 *   Array of group objects.
 *
 * @return bool
 *   TRUE if element has non-empty children, FALSE otherwise.
 */
function _field_group_is_empty_element($element, $entity, $childname, $groups) {

  $exceptions = array('user__account', 'comment__author');
  $exception = $entity . '__' . $childname;

  if (in_array($exception, $exceptions)) {
    return TRUE;
  }

  if (isset($element[$childname]['#type'])
    || isset($element[$childname]['#markup'])
    || isset($element[$childname]['#prefix'])
    || isset($element[$childname]['#suffix'])
  ) {
    return TRUE;
  }

  // Prevent a double recursive loop (groups are already recursive looped in field_group_remove_empty_form_groups.
  if (in_array($childname, $groups)) {
    return FALSE;
  }

  $children = element_children($element[$childname]);

  foreach ($children as $child) {
    if (_field_group_is_empty_element($element[$childname], $entity, $child, $groups)) {
      return TRUE;
    }
  }

  return FALSE;

}

/**
 * Remove empty groups on entity display.
 *
 * @param array $element
 *   The element to check the empty state.
 * @param array $groups
 *   Array of group objects.
 *
 * @return bool
 *   TRUE if group is empty, FALSE otherwise.
 */
function field_group_remove_empty_display_groups(&$element, $groups) {

  $empty_child = TRUE;
  $empty_group = TRUE;

  // Loop through the children for current element.
  foreach (element_children($element) as $name) {

    // Descend if the child is a group.
    if (in_array($name, $groups)) {
      $empty_child = field_group_remove_empty_display_groups($element[$name], $groups);
      if (!$empty_child) {
        $empty_group = FALSE;
      }
    }
    // Child is a field, the element is not empty and access is set to true (or empty).
    elseif (!empty($element[$name]) && (!isset($element[$name]['#access']) || $element[$name]['#access'])) {
      $empty_group = FALSE;
    }

  }

  // Reset an empty group.
  if ($empty_group) {
    $element = NULL;
  }

  return $empty_group;

}

/**
 * Implements hook_field_group_format_summary().
 */
function field_group_field_group_format_summary($group) {

  $group_form = module_invoke_all('field_group_format_settings', $group);

  backdrop_alter('field_group_format_settings', $group_form, $group);

  $output = '';
  if (isset($group->format_settings['formatter'])) {
    $output .= '<strong>' . $group->format_type . '</strong> ' . $group->format_settings['formatter'] . '';
  }
  if (isset($group->format_settings['instance_settings'])) {
    $last = end($group->format_settings['instance_settings']);
    $output .= '<br />';
    foreach ($group->format_settings['instance_settings'] as $key => $value) {
      if (empty($value)) {
        continue;
      }

      $output .= '<strong>' . $key . '</strong> ';

      if (isset($group_form['instance_settings'], $group_form['instance_settings'][$key]['#options'])) {
        if (is_array($value)) {
          $value = implode(', ', array_filter($value));
        }
        else {
          $value = $group_form['instance_settings'][$key]['#options'][$value];
        }
      }

      // Shorten the string.
      if (backdrop_strlen($value) > 38) {
        $value = truncate_utf8($value, 50, TRUE, TRUE);
      }
      // If still numeric, handle it as yes or no.
      elseif (is_numeric($value)) {
        $value = $value == '1' ? t('yes') : t('no');
      }
      $output .= check_plain($value);
      $output .= $last == $value ? ' ' : '<br />';
    }
  }
  return $output;
}

/**
 * Implements hook_field_extra_fields().
 */
function field_group_field_extra_fields() {
  $extra = array();

  $extra['user']['user'] = array('form' => array());

  // User picture field to integrate with user module.
  if (config_get('system.core', 'user_pictures')) {
    $extra['user']['user']['form']['picture'] = array(
      'label' => t('Picture'),
      'description' => t('User picture'),
      'weight' => 5,
    );
  }

  // Field to itegrate with contact module.
  if (module_exists('contact')) {
    $extra['user']['user']['form']['contact'] = array(
      'label' => t('Contact'),
      'description' => t('Contact user element'),
     'weight' => 5,
    );
  }

  // Field to integrate with the locale module.
  if (module_exists('locale')) {
    $extra['user']['user']['form']['locale'] = array(
      'label' => t('Language settings'),
      'description' => t('Language settings for the user account.'),
      'weight' => 5,
    );
  }

  return $extra;
}

/**
 * Implements hook_field_attach_rename_bundle().
 */
function field_group_field_attach_rename_bundle($entity_type, $bundle_old, $bundle_new) {
  $prefix = 'field_group.field_group.' . $entity_type;
  $field_group_config_names = config_get_names_with_prefix("$prefix.$bundle_old.");
  foreach ($field_group_config_names as $config_name) {
    $mode_field_group = str_replace("$prefix.$bundle_old.", '', $config_name);
    $field_group_old = config("$prefix.$bundle_old.$mode_field_group");
    $field_group_new = config("$prefix.$bundle_new.$mode_field_group");
    $data = $field_group_old->get();
    $data['bundle'] = $bundle_new;
    $field_group_new->setData($data);
    $field_group_new->save();
    $field_group_old->delete();
  }

  // Clear the cache.
  field_cache_clear();
  entity_info_cache_clear();
}

/**
 * Get all groups that match.
 *
 * @param string $entity_type
 *   The name of the entity type.
 * @param string $bundle
 *   The name of the bundle.
 * @param string $view_mode
 *   The view mode.
 * @param bool $reset.
 *   Whether to reset the cache or not.
 *
 * @return array
 *   Array of group objects.
 */
function field_group_info_groups($entity_type = NULL, $bundle = NULL, $view_mode = NULL, $reset = FALSE) {
  static $groups = FALSE;

  if (!$groups || $reset) {
    $groups = field_group_read_groups();
  }

  if (!isset($entity_type)) {
    return $groups;
  }
  elseif (!isset($bundle) && isset($groups[$entity_type])) {
    return $groups[$entity_type];
  }
  elseif (!isset($view_mode) && isset($groups[$entity_type][$bundle])) {
    return $groups[$entity_type][$bundle];
  }
  elseif (isset($groups[$entity_type][$bundle][$view_mode])) {
    return $groups[$entity_type][$bundle][$view_mode];
  }
  return array();
}

/**
 * Read all groups.
 *
 * @param array $conditions
 *   Parameters for the query, as elements of the $conditions array.
 *   'entity_type' The name of the entity type.
 *   'bundle' The name of the bundle.
 *   'mode' The view mode.
 *
 * @return array
 *   Array of group objects.
 */
function field_group_read_groups($conditions = array()) {

  $groups = array();

  $records = array();

  $config_names = config_get_names_with_prefix('field_group.field_group');
  foreach ($config_names as $config_name) {
    $config = config($config_name);
    $field = (object)$config->get();
    $records[$config_name] = $field;

    // If any conditions don't pass then skip that record
    if (!empty($conditions)) {
      foreach ($conditions as $key => $value) {
        if ($field->$key != $value) {
          unset($records[$config_name]);
        }
      }
    }
  }

  foreach ($records as $group) {
    $groups[$group->entity_type][$group->bundle][$group->mode][$group->group_name] = $group;
  }
  backdrop_alter('field_group_info', $groups);
  return $groups;

}

/**
 * Checks if a field_group exists in required context.
 *
 * @param string $group_name
 *   The name of the group.
 * @param string $entity_type
 *   The name of the entity.
 * @param string $bundle
 *   The bundle for the entity.
 * @param string $mode
 *   The view mode context the group will be rendered.
 *
 * @return bool
 *   TRUE if group exists, FALSE otherwise.
 */
function field_group_exists($group_name, $entity_type, $bundle, $mode) {
  $groups = field_group_read_groups();
  return !empty($groups[$entity_type][$bundle][$mode][$group_name]);
}

/**
 * Delete a field group.
 *
 * @param object $group
 *   A group definition.
 */
function field_group_group_delete($group) {

  $config = config('field_group.field_group.' . $group->entity_type . '.' . $group->bundle . '.' . $group->mode . '.' . $group->group_name);
  $config->delete();

  cache_clear_all('field_groups', 'cache_field');
  module_invoke_all('field_group_delete_field_group', $group);

}

/**
 * Saves a group definition.
 *
 * @param object $group
 *   A group definition.
 */
function field_group_group_save(&$group, $new = TRUE) {

  // Prepare the record.
  $object = $group;

  if ($new == FALSE) {
    // Existing record.
    module_invoke_all('field_group_update_field_group', $object);
  }
  else {
    // New record.
    module_invoke_all('field_group_create_field_group', $object);
  }

  $config = config('field_group.field_group.' . $object->entity_type . '.' . $object->bundle . '.' . $object->mode . '.' . $object->group_name);
  $config->setData((array)$object);
  $config->save();
}

/**
 * Retrieve all format possibilities for the fieldgroups.
 *
 * @return array|NULL
 *   Array of formatters. Attempts to retrieve from static cache if set.
 */
function field_group_formatter_info() {
  $cache = &backdrop_static(__FUNCTION__, array());
  if (empty($cache)) {
    if ($cached = cache_get('field_group_formatter_info', 'cache_field')) {
      $formatters = $cached->data;
    }
    else {
      $formatters = array();
      $formatters += module_invoke_all('field_group_formatter_info');
      $hidden_region = array(
        'label' => '<' . t('Hidden') . '>',
        'description' => '',
        'format_types' => array(),
        'instance_settings' => array(),
        'default_formatter' => '',
      );
      //$formatters['form']['hidden'] = $hidden_region;
      $formatters['display']['hidden'] = $hidden_region;
      cache_set('field_group_formatter_info', $formatters, 'cache_field');
    }
    $cache = $formatters;
  }
  return $cache;
}

/**
 * Attach groups to the (form) build.
 *
 * @param array $element
 *   The part of the form.
 * @param string $view_mode
 *   The mode for the build.
 */
function field_group_attach_groups(&$element, $view_mode) {

  $entity_type = $element['#entity_type'];
  $bundle = $element['#bundle'];

  $element['#groups'] = field_group_info_groups($entity_type, $bundle, $view_mode);
  $element['#fieldgroups'] = $element['#groups'];

  // Create a lookup array.
  $group_children = array();
  foreach ($element['#groups'] as $group_name => $group) {
    if (!empty($group->children)) {
      foreach ($group->children as $child) {
        $group_children[$child] = $group_name;
      }
    }
  }
  $element['#group_children'] = $group_children;

}

/**
 * Pre render callback for rendering groups.
 *
 * @param $element Form that is being rendered.
 *
 * @return array
 *   Array with re-arranged fields in forms.
 *
 * @see field_group_field_attach_form
 */
function field_group_form_pre_render(&$element) {
  return field_group_build_entity_groups($element, 'form');
}

/**
 * Preprocess/ Pre-render callback.
 *
 * @param array $vars
 *   Preprocess vars or form element
 * @param string $type
 *   The type of object being rendered
 *
 * @return array
 *   Array with re-arranged fields in forms.
 *
 * @see field_group_form_pre_render()
 * @see field_group_theme_registry_alter
 * @see field_group_fields_nest()
 */
function field_group_build_entity_groups(&$vars, $type) {

  if ($type == 'form') {
    $element = &$vars;
    $nest_vars = NULL;
  }
  else {
    $element = &$vars['elements'];
    $nest_vars = &$vars;
  }

  // No groups on the entity.
  if (empty($element['#fieldgroups'])) {
    return $element;
  }

  // Nest the fields in the corresponding field groups.
  field_group_fields_nest($element, $nest_vars);

  // Someone is doing a node view, in a node view. Reset content.
  // @todo Check if this breaks something else.
  if (isset($element['#node']->content) && count($element['#node']->content) > 0) {
    $element['#node']->content = array();
  }

  $display = isset($element['#view_mode']);
  $groups = array_keys($element['#groups']);

  // Dish the fieldgroups with no fields for non-forms.
  if ($display) {
    field_group_remove_empty_display_groups($element, $groups);
  }
  else {
    // Fix the problem on forms with additional settings.
    field_group_remove_empty_form_groups('form', $element, $groups, $element['#groups'], $element['#entity_type']);
  }

  // Add the default field_group javascript.
  $element['#attached']['js'][] = backdrop_get_path('module', 'field_group') . '/js/field_group.js';

  // Allow others to alter the pre_rendered build.
  backdrop_alter('field_group_build_pre_render', $element);

  // Return the element on forms.
  if ($type == 'form') {
    return $element;
  }

  // No groups on the entity. Prerender removed empty field groups.
  if (empty($element['#fieldgroups'])) {
    return $element;
  }

  // Put groups inside content if we are rendering an entity_view.
  foreach ($element['#fieldgroups'] as $group) {
    if (!empty($element[$group->group_name]) && $type != 'user_profile') {
      $vars['content'][$group->group_name] = $element[$group->group_name];
    }
    elseif (!empty($element[$group->group_name])) {
      $vars['user_profile'][$group->group_name] = $element[$group->group_name];
    }
  }

  // New css / js can be attached.
  backdrop_process_attached($element);
}

/**
 * Recursive function to nest fields in the field groups.
 *
 * Will take out all the elements in the form and
 * place them in the correct container element, a fieldgroup.
 * The current group element in the loop is passed recursively so we can
 * stash fields and groups in it while we go deeper in the array.
 *
 * @param array $element
 *   The current element to analyse for grouping.
 * @param array $vars
 *   Rendering vars from the entity being viewed.
 */
function field_group_fields_nest(&$element, &$vars = NULL) {

  // Create all groups and keep a flat list of references to these groups.
  $group_references = array();
  foreach ($element['#fieldgroups'] as $group_name => $group) {
    // check for any erroneous groups from other modules
    if (is_string($group_name)) {
      // Construct own weight, as some fields (for example preprocess fields) don't have weight set.
      $element[$group_name] = array();
      $group_references[$group_name] = &$element[$group_name];
    }
  }

  // Loop through all form children looking for those that are supposed to be
  // in groups, and insert placeholder element for the new group field in the
  // correct location within the form structure.
  $element_clone = array();
  foreach (element_children($element) as $child_name) {
    $element_clone[$child_name] = $element[$child_name];
    // If this element is in a group, create the placeholder element.
    if (isset($element['#group_children'][$child_name])) {
      $element_clone[$element['#group_children'][$child_name]] = array();
    }
  }
  $element = array_merge($element_clone, $element);

  // Move all children to their parents. Use the flat list of references for
  // direct access as we don't know where in the root_element hierarchy the
  // parent currently is situated.
  foreach ($element['#group_children'] as $child_name => $parent_name) {

    // Entity being viewed
    if ($vars) {
      // If not a group, check vars['content'] for empty field.
      if (!isset($element['#fieldgroups'][$child_name]) && isset($vars['content'][$child_name])) {
        $group_references[$parent_name][$child_name] = $vars['content'][$child_name];
        unset($vars['content'][$child_name]);
      }
      elseif (!isset($element['#fieldgroups'][$child_name]) && isset($vars['user_profile'][$child_name])) {
        $group_references[$parent_name][$child_name] = $vars['user_profile'][$child_name];
        unset($vars['user_profile'][$child_name]);
      }
      // If this is a group, we have to use a reference to keep the reference
      // list intact (but if it is a field we don't mind).
      else {
        $group_references[$parent_name][$child_name] = &$element[$child_name];
        unset($element[$child_name]);
      }
    }
    // Form being viewed
    else {

      // Block denied fields (#access) before they are put in groups.
      // Fields (not groups) that don't have children (like field_permissions) are removed
      // in field_group_field_group_build_pre_render_alter.
      if (isset($element[$child_name]) && (!isset($element[$child_name]['#access']) || $element[$child_name]['#access'])) {
        // If this is a group, we have to use a reference to keep the reference
        // list intact (but if it is a field we don't mind).
        $group_references[$parent_name][$child_name] = &$element[$child_name];
        $group_references[$parent_name]['#weight'] = $element['#fieldgroups'][$parent_name]->weight;
      }

      // The child has been copied to its parent: remove it from the root element.
      unset($element[$child_name]);
    }

  }

  // Bring extra element wrappers to achieve a grouping of fields.
  // This will mainly be prefix and suffix altering.
  foreach ($element['#fieldgroups'] as $group_name => $group) {
    field_group_pre_render($group_references[$group_name], $group, $element);
  }

}

/**
 * Pre render the field group element.
 *
 * @param array $element
 *   Array of group element that needs to be created!
 * @param object $group
 *   Object with the group information.
 * @param array $form
 *   An associative array containing the structure of the form.
 *
 * @see field_group_fields_nest()
 */
function field_group_pre_render(&$element, $group, &$form) {

  // Only run the pre_render function if the group has elements.
  // $group->group_name
  if ($element == array()) {
    return;
  }

  // Let modules define their wrapping element.
  // Note that the group element has no properties, only elements.
  foreach (module_implements('field_group_pre_render') as $module) {
    $function = $module . '_field_group_pre_render';
    if (function_exists($function)) {
      // The intention here is to have the opportunity to alter the
      // elements, as defined in hook_field_group_formatter_info.
      // Note, implement $element by reference!
      $function($element, $group, $form);
    }
  }

  // Allow others to alter the pre_render.
  backdrop_alter('field_group_pre_render', $element, $group, $form);

}

/**
 * Hides field groups including children in a render array.
 *
 * @param array $element
 *   A render array. Can be a form, node, user, ...
 * @param array $group_names
 *   An array of field group names that should be hidden.
 */
function field_group_hide_field_groups(&$element, $group_names) {
  foreach ($group_names as $group_name) {
    if (isset($element['#fieldgroups'][$group_name]) && isset($element['#group_children'])) {
      // Hide the field group.
      $element['#fieldgroups'][$group_name]->format_type = 'hidden';
      // Hide the elements inside the field group.
      $sub_groups = array();
      foreach (array_keys($element['#group_children'], $group_name) as $field_name) {
        if (isset($element['#fieldgroups'][$field_name])) {
          $sub_groups[] = $field_name;
        } else {
          $element[$field_name]['#access'] = FALSE;
        }
      }
      field_group_hide_field_groups($element, $sub_groups);
    }
  }
}

/**
 * Calculates html classes for a group.
 *
 * @param object $group
 *   The Group definition.
 *
 * @return object
 *   The HTML classes calculated for the field group.
 *
 * @see hook_field_group_html_classes_alter()
 */
function _field_group_get_html_classes(&$group) {

  if (isset($group->format_settings['formatter'])) {
    $group->collapsible = in_array($group->format_settings['formatter'], array('collapsible', 'collapsed'));
    $group->collapsed = in_array($group->format_settings['formatter'], array('collapsed', 'closed'));
  }

  $classes = new stdClass();

  // Prepare extra classes, required and optional ones.
  $optional = array(str_replace('_', '-', $group->group_name));
  $required = array();

  $optional[] = 'field-group-' . $group->format_type;

  if (isset($group->format_settings['formatter']) && $group->collapsible) {
    $required[] = 'collapsible';
    if ($group->collapsed) {
      $required[] = 'collapsed';
    }
  }

  if (isset($group->format_settings['instance_settings'])) {

    // Add a required-fields class to trigger the js.
    if (!empty($group->format_settings['instance_settings']['required_fields'])) {
      $required[] = 'required-fields';
    }

    // Add user selected classes.
    if (!empty($group->format_settings['instance_settings']['classes'])) {
      $required[] = check_plain($group->format_settings['instance_settings']['classes']);
    }
  }

  $classes->required = $required;
  $classes->optional = $optional;

  backdrop_alter('field_group_html_classes', $classes, $group);

  return $classes;
}

/**
 * Get the default formatter settings for a given formatter and a mode.
 *
 * @param string $format_type
 *   The name of the format type.
 * @param string $mode
 *   The mode type.
 *
 * @return array
 *   An array of the default formatter and instance settings.
 */
function _field_group_get_default_formatter_settings($format_type, $mode) {

  $field_group_types = field_group_formatter_info();
  $display_mode = $mode == 'form' ? 'form' : 'display';
  $formatter = $field_group_types[$display_mode][$format_type];

  return array(
    'formatter' => isset($formatter['default_formatter']) ? $formatter['default_formatter'] : '',
    'instance_settings' => $formatter['instance_settings']
  );
}