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root / drupal7 / modules / field / field.api.php @ 2196f227

       <?php
       /**
        * @file
        * Hooks provided by the Field module.
        */
       /**
        * @addtogroup hooks
        * @{
        */
       /**
        * Exposes "pseudo-field" components on fieldable entities.
+       *
        * Field UI's "Manage fields" and "Manage display" pages let users re-order
        * fields, but also non-field components. For nodes, these include the title,
        * poll choices, and other elements exposed by modules through hook_form() or
        * hook_form_alter().
+       *
        * Fieldable entities or modules that want to have their components supported
        * should expose them using this hook. The user-defined settings (weight,
        * visible) are automatically applied on rendered forms and displayed
        * entities in a #pre_render callback added by field_attach_form() and
        * field_attach_view().
+       *
        * @see _field_extra_fields_pre_render()
        * @see hook_field_extra_fields_alter()
+       *
        * @return
        *   A nested array of 'pseudo-field' elements. Each list is nested within the
        *   following keys: entity type, bundle name, context (either 'form' or
        *   'display'). The keys are the name of the elements as appearing in the
        *   renderable array (either the entity form or the displayed entity). The
        *   value is an associative array:
        *   - label: The human readable name of the element.
        *   - description: A short description of the element contents.
        *   - weight: The default weight of the element.
        *   - edit: (optional) String containing markup (normally a link) used as the
        *     element's 'edit' operation in the administration interface. Only for
        *     'form' context.
        *   - delete: (optional) String containing markup (normally a link) used as the
        *     element's 'delete' operation in the administration interface. Only for
        *     'form' context.
+       *
        * @ingroup field_types
        */
       function hook_field_extra_fields() {
         $extra['node']['poll'] = array(
           'form' => array(
             'choice_wrapper' => array(
               'label' => t('Poll choices'),
               'description' => t('Poll choices'),
               'weight' => -4,
             ),
             'settings' => array(
               'label' => t('Poll settings'),
               'description' => t('Poll module settings'),
               'weight' => -3,
             ),
           ),
           'display' => array(
             'poll_view_voting' => array(
               'label' => t('Poll vote'),
               'description' => t('Poll vote'),
               'weight' => 0,
             ),
             'poll_view_results' => array(
               'label' => t('Poll results'),
               'description' => t('Poll results'),
               'weight' => 0,
             ),
+          )
         );
         return $extra;
+      }
       /**
        * Alter "pseudo-field" components on fieldable entities.
+       *
        * @param $info
        *   The associative array of 'pseudo-field' components.
+       *
        * @see hook_field_extra_fields()
+       *
        * @ingroup field_types
        */
       function hook_field_extra_fields_alter(&$info) {
         // Force node title to always be at the top of the list by default.
         foreach (node_type_get_types() as $bundle) {
           if (isset($info['node'][$bundle->type]['form']['title'])) {
             $info['node'][$bundle->type]['form']['title']['weight'] = -20;
+          }
+        }
+      }
       /**
        * @defgroup field_types Field Types API
        * @{
        * Define field types.
+       *
        * In the Field API, each field has a type, which determines what kind of data
        * (integer, string, date, etc.) the field can hold, which settings it provides,
        * and so on. The data type(s) accepted by a field are defined in
        * hook_field_schema(); other basic properties of a field are defined in
        * hook_field_info(). The other hooks below are called by the Field Attach API
        * to perform field-type-specific actions.
+       *
        * The Field Types API also defines two kinds of pluggable handlers: widgets
        * and formatters. @link field_widget Widgets @endlink specify how the field
        * appears in edit forms, while @link field_formatter formatters @endlink
        * specify how the field appears in displayed entities.
+       *
        * A third kind of pluggable handlers, storage backends, is defined by the
        * @link field_storage Field Storage API @endlink.
+       *
        * See @link field Field API @endlink for information about the other parts of
        * the Field API.
        */
       /**
        * Define Field API field types.
+       *
        * Along with this hook, you also need to implement other hooks. See
        * @link field_types Field Types API @endlink for more information.
+       *
        * @return
        *   An array whose keys are field type names and whose values are arrays
        *   describing the field type, with the following key/value pairs:
        *   - label: The human-readable name of the field type.
        *   - description: A short description for the field type.
        *   - settings: An array whose keys are the names of the settings available
        *     for the field type, and whose values are the default values for those
        *     settings.
        *   - instance_settings: An array whose keys are the names of the settings
        *     available for instances of the field type, and whose values are the
        *     default values for those settings. Instance-level settings can have
        *     different values on each field instance, and thus allow greater
        *     flexibility than field-level settings. It is recommended to put settings
        *     at the instance level whenever possible. Notable exceptions: settings
        *     acting on the schema definition, or settings that Views needs to use
        *     across field instances (for example, the list of allowed values).
        *   - default_widget: The machine name of the default widget to be used by
        *     instances of this field type, when no widget is specified in the
        *     instance definition. This widget must be available whenever the field
        *     type is available (i.e. provided by the field type module, or by a module
        *     the field type module depends on).
        *   - default_formatter: The machine name of the default formatter to be used
        *     by instances of this field type, when no formatter is specified in the
        *     instance definition. This formatter must be available whenever the field
        *     type is available (i.e. provided by the field type module, or by a module
        *     the field type module depends on).
        *   - no_ui: (optional) A boolean specifying that users should not be allowed
        *     to create fields and instances of this field type through the UI. Such
        *     fields can only be created programmatically with field_create_field()
        *     and field_create_instance(). Defaults to FALSE.
+       *
        * @see hook_field_info_alter()
        */
       function hook_field_info() {
         return array(
           'text' => array(
             'label' => t('Text'),
             'description' => t('This field stores varchar text in the database.'),
             'settings' => array('max_length' => 255),
             'instance_settings' => array('text_processing' => 0),
             'default_widget' => 'text_textfield',
             'default_formatter' => 'text_default',
           ),
           'text_long' => array(
             'label' => t('Long text'),
             'description' => t('This field stores long text in the database.'),
             'settings' => array('max_length' => ''),
             'instance_settings' => array('text_processing' => 0),
             'default_widget' => 'text_textarea',
             'default_formatter' => 'text_default',
           ),
           'text_with_summary' => array(
             'label' => t('Long text and summary'),
             'description' => t('This field stores long text in the database along with optional summary text.'),
             'settings' => array('max_length' => ''),
             'instance_settings' => array('text_processing' => 1, 'display_summary' => 0),
             'default_widget' => 'text_textarea_with_summary',
             'default_formatter' => 'text_summary_or_trimmed',
           ),
         );
+      }
       /**
        * Perform alterations on Field API field types.
+       *
        * @param $info
        *   Array of information on field types exposed by hook_field_info()
        *   implementations.
        */
       function hook_field_info_alter(&$info) {
         // Add a setting to all field types.
         foreach ($info as $field_type => $field_type_info) {
           $info[$field_type]['settings'] += array(
             'mymodule_additional_setting' => 'default value',
           );
+        }
         // Change the default widget for fields of type 'foo'.
         if (isset($info['foo'])) {
           $info['foo']['default widget'] = 'mymodule_widget';
+        }
+      }
       /**
        * Define the Field API schema for a field structure.
+       *
        * This is invoked when a field is created, in order to obtain the database
        * schema from the module that defines the field's type.
+       *
        * This hook must be defined in the module's .install file for it to be detected
        * during installation and upgrade.
+       *
        * @param $field
        *   A field structure.
+       *
        * @return
        *   An associative array with the following keys:
        *   - columns: An array of Schema API column specifications, keyed by column
        *     name. This specifies what comprises a value for a given field. For
        *     example, a value for a number field is simply 'value', while a value for
        *     a formatted text field is the combination of 'value' and 'format'. It is
        *     recommended to avoid having the column definitions depend on field
        *     settings when possible. No assumptions should be made on how storage
        *     engines internally use the original column name to structure their
        *     storage.
        *   - indexes: (optional) An array of Schema API indexes definitions. Only
        *     columns that appear in the 'columns' array are allowed. Those indexes
        *     will be used as default indexes. Callers of field_create_field() can
        *     specify additional indexes, or, at their own risk, modify the default
        *     indexes specified by the field-type module. Some storage engines might
        *     not support indexes.
        *   - foreign keys: (optional) An array of Schema API foreign keys
        *     definitions.
        */
       function hook_field_schema($field) {
         if ($field['type'] == 'text_long') {
           $columns = array(
             'value' => array(
               'type' => 'text',
               'size' => 'big',
               'not null' => FALSE,
             ),
           );
+        }
         else {
           $columns = array(
             'value' => array(
               'type' => 'varchar',
               'length' => $field['settings']['max_length'],
               'not null' => FALSE,
             ),
           );
+        }
         $columns += array(
           'format' => array(
             'type' => 'varchar',
             'length' => 255,
             'not null' => FALSE,
           ),
         );
         return array(
           'columns' => $columns,
           'indexes' => array(
             'format' => array('format'),
           ),
           'foreign keys' => array(
             'format' => array(
               'table' => 'filter_format',
               'columns' => array('format' => 'format'),
             ),
           ),
         );
+      }
       /**
        * Define custom load behavior for this module's field types.
+       *
        * Unlike most other field hooks, this hook operates on multiple entities. The
        * $entities, $instances and $items parameters are arrays keyed by entity ID.
        * For performance reasons, information for all available entity should be
        * loaded in a single query where possible.
+       *
        * Note that the changes made to the field values get cached by the field cache
        * for subsequent loads. You should never use this hook to load fieldable
        * entities, since this is likely to cause infinite recursions when
        * hook_field_load() is run on those as well. Use
        * hook_field_formatter_prepare_view() instead.
+       *
        * Make changes or additions to field values by altering the $items parameter by
        * reference. There is no return value.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entities
        *   Array of entities being loaded, keyed by entity ID.
        * @param $field
        *   The field structure for the operation.
        * @param $instances
        *   Array of instance structures for $field for each entity, keyed by entity
        *   ID.
        * @param $langcode
        *   The language code associated with $items.
        * @param $items
        *   Array of field values already loaded for the entities, keyed by entity ID.
        *   Store your changes in this parameter (passed by reference).
        * @param $age
        *   FIELD_LOAD_CURRENT to load the most recent revision for all fields, or
        *   FIELD_LOAD_REVISION to load the version indicated by each entity.
        */
       function hook_field_load($entity_type, $entities, $field, $instances, $langcode, &$items, $age) {
         // Sample code from text.module: precompute sanitized strings so they are
         // stored in the field cache.
         foreach ($entities as $id => $entity) {
           foreach ($items[$id] as $delta => $item) {
             // Only process items with a cacheable format, the rest will be handled
             // by formatters if needed.
             if (empty($instances[$id]['settings']['text_processing']) || filter_format_allowcache($item['format'])) {
               $items[$id][$delta]['safe_value'] = isset($item['value']) ? _text_sanitize($instances[$id], $langcode, $item, 'value') : '';
               if ($field['type'] == 'text_with_summary') {
                 $items[$id][$delta]['safe_summary'] = isset($item['summary']) ? _text_sanitize($instances[$id], $langcode, $item, 'summary') : '';
+              }
+            }
+          }
+        }
+      }
       /**
        * Prepare field values prior to display.
+       *
        * This hook is invoked before the field values are handed to formatters
        * for display, and runs before the formatters' own
        * hook_field_formatter_prepare_view().
+       *
        * Unlike most other field hooks, this hook operates on multiple entities. The
        * $entities, $instances and $items parameters are arrays keyed by entity ID.
        * For performance reasons, information for all available entities should be
        * loaded in a single query where possible.
+       *
        * Make changes or additions to field values by altering the $items parameter by
        * reference. There is no return value.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entities
        *   Array of entities being displayed, keyed by entity ID.
        * @param $field
        *   The field structure for the operation.
        * @param $instances
        *   Array of instance structures for $field for each entity, keyed by entity
        *   ID.
        * @param $langcode
        *   The language associated to $items.
        * @param $items
        *   $entity->{$field['field_name']}, or an empty array if unset.
        */
       function hook_field_prepare_view($entity_type, $entities, $field, $instances, $langcode, &$items) {
         // Sample code from image.module: if there are no images specified at all,
         // use the default image.
         foreach ($entities as $id => $entity) {
           if (empty($items[$id]) && $field['settings']['default_image']) {
             if ($file = file_load($field['settings']['default_image'])) {
               $items[$id][0] = (array) $file + array(
                 'is_default' => TRUE,
                 'alt' => '',
                 'title' => '',
               );
+            }
+          }
+        }
+      }
       /**
        * Validate this module's field data.
+       *
        * If there are validation problems, add to the $errors array (passed by
        * reference). There is no return value.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entity
        *   The entity for the operation.
        * @param $field
        *   The field structure for the operation.
        * @param $instance
        *   The instance structure for $field on $entity's bundle.
        * @param $langcode
        *   The language associated with $items.
        * @param $items
        *   $entity->{$field['field_name']}[$langcode], or an empty array if unset.
        * @param $errors
        *   The array of errors (keyed by field name, language code, and delta) that
        *   have already been reported for the entity. The function should add its
        *   errors to this array. Each error is an associative array with the following
        *   keys and values:
        *   - error: An error code (should be a string prefixed with the module name).
        *   - message: The human readable message to be displayed.
        */
       function hook_field_validate($entity_type, $entity, $field, $instance, $langcode, $items, &$errors) {
         foreach ($items as $delta => $item) {
           if (!empty($item['value'])) {
             if (!empty($field['settings']['max_length']) && drupal_strlen($item['value']) > $field['settings']['max_length']) {
               $errors[$field['field_name']][$langcode][$delta][] = array(
                 'error' => 'text_max_length',
                 'message' => t('%name: the value may not be longer than %max characters.', array('%name' => $instance['label'], '%max' => $field['settings']['max_length'])),
               );
+            }
+          }
+        }
+      }
       /**
        * Define custom presave behavior for this module's field types.
+       *
        * Make changes or additions to field values by altering the $items parameter by
        * reference. There is no return value.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entity
        *   The entity for the operation.
        * @param $field
        *   The field structure for the operation.
        * @param $instance
        *   The instance structure for $field on $entity's bundle.
        * @param $langcode
        *   The language associated with $items.
        * @param $items
        *   $entity->{$field['field_name']}[$langcode], or an empty array if unset.
        */
       function hook_field_presave($entity_type, $entity, $field, $instance, $langcode, &$items) {
         if ($field['type'] == 'number_decimal') {
           // Let PHP round the value to ensure consistent behavior across storage
           // backends.
           foreach ($items as $delta => $item) {
             if (isset($item['value'])) {
               $items[$delta]['value'] = round($item['value'], $field['settings']['scale']);
+            }
+          }
+        }
+      }
       /**
        * Define custom insert behavior for this module's field data.
+       *
        * This hook is invoked from field_attach_insert() on the module that defines a
        * field, during the process of inserting an entity object (node, taxonomy term,
        * etc.). It is invoked just before the data for this field on the particular
        * entity object is inserted into field storage. Only field modules that are
        * storing or tracking information outside the standard field storage mechanism
        * need to implement this hook.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entity
        *   The entity for the operation.
        * @param $field
        *   The field structure for the operation.
        * @param $instance
        *   The instance structure for $field on $entity's bundle.
        * @param $langcode
        *   The language associated with $items.
        * @param $items
        *   $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+       *
        * @see hook_field_update()
        * @see hook_field_delete()
        */
       function hook_field_insert($entity_type, $entity, $field, $instance, $langcode, &$items) {
         if (variable_get('taxonomy_maintain_index_table', TRUE) && $field['storage']['type'] == 'field_sql_storage' && $entity_type == 'node' && $entity->status) {
           $query = db_insert('taxonomy_index')->fields(array('nid', 'tid', 'sticky', 'created', ));
           foreach ($items as $item) {
             $query->values(array(
               'nid' => $entity->nid,
               'tid' => $item['tid'],
               'sticky' => $entity->sticky,
               'created' => $entity->created,
             ));
+          }
           $query->execute();
+        }
+      }
       /**
        * Define custom update behavior for this module's field data.
+       *
        * This hook is invoked from field_attach_update() on the module that defines a
        * field, during the process of updating an entity object (node, taxonomy term,
        * etc.). It is invoked just before the data for this field on the particular
        * entity object is updated into field storage. Only field modules that are
        * storing or tracking information outside the standard field storage mechanism
        * need to implement this hook.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entity
        *   The entity for the operation.
        * @param $field
        *   The field structure for the operation.
        * @param $instance
        *   The instance structure for $field on $entity's bundle.
        * @param $langcode
        *   The language associated with $items.
        * @param $items
        *   $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+       *
        * @see hook_field_insert()
        * @see hook_field_delete()
        */
       function hook_field_update($entity_type, $entity, $field, $instance, $langcode, &$items) {
         if (variable_get('taxonomy_maintain_index_table', TRUE) && $field['storage']['type'] == 'field_sql_storage' && $entity_type == 'node') {
           $first_call = &drupal_static(__FUNCTION__, array());
           // We don't maintain data for old revisions, so clear all previous values
           // from the table. Since this hook runs once per field, per object, make
           // sure we only wipe values once.
           if (!isset($first_call[$entity->nid])) {
             $first_call[$entity->nid] = FALSE;
             db_delete('taxonomy_index')->condition('nid', $entity->nid)->execute();
+          }
           // Only save data to the table if the node is published.
           if ($entity->status) {
             $query = db_insert('taxonomy_index')->fields(array('nid', 'tid', 'sticky', 'created'));
             foreach ($items as $item) {
               $query->values(array(
                 'nid' => $entity->nid,
                 'tid' => $item['tid'],
                 'sticky' => $entity->sticky,
                 'created' => $entity->created,
               ));
+            }
             $query->execute();
+          }
+        }
+      }
       /**
        * Update the storage information for a field.
+       *
        * This is invoked on the field's storage module from field_update_field(),
        * before the new field information is saved to the database. The field storage
        * module should update its storage tables to agree with the new field
        * information. If there is a problem, the field storage module should throw an
        * exception.
+       *
        * @param $field
        *   The updated field structure to be saved.
        * @param $prior_field
        *   The previously-saved field structure.
        * @param $has_data
        *   TRUE if the field has data in storage currently.
        */
       function hook_field_storage_update_field($field, $prior_field, $has_data) {
         if (!$has_data) {
           // There is no data. Re-create the tables completely.
           $prior_schema = _field_sql_storage_schema($prior_field);
           foreach ($prior_schema as $name => $table) {
             db_drop_table($name, $table);
+          }
           $schema = _field_sql_storage_schema($field);
           foreach ($schema as $name => $table) {
             db_create_table($name, $table);
+          }
+        }
         else {
           // There is data. See field_sql_storage_field_storage_update_field() for
           // an example of what to do to modify the schema in place, preserving the
           // old data as much as possible.
+        }
         drupal_get_schema(NULL, TRUE);
+      }
       /**
        * Define custom delete behavior for this module's field data.
+       *
        * This hook is invoked from field_attach_delete() on the module that defines a
        * field, during the process of deleting an entity object (node, taxonomy term,
        * etc.). It is invoked just before the data for this field on the particular
        * entity object is deleted from field storage. Only field modules that are
        * storing or tracking information outside the standard field storage mechanism
        * need to implement this hook.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entity
        *   The entity for the operation.
        * @param $field
        *   The field structure for the operation.
        * @param $instance
        *   The instance structure for $field on $entity's bundle.
        * @param $langcode
        *   The language associated with $items.
        * @param $items
        *   $entity->{$field['field_name']}[$langcode], or an empty array if unset.
+       *
        * @see hook_field_insert()
        * @see hook_field_update()
        */
       function hook_field_delete($entity_type, $entity, $field, $instance, $langcode, &$items) {
         list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
         foreach ($items as $delta => $item) {
           // For hook_file_references(), remember that this is being deleted.
           $item['file_field_name'] = $field['field_name'];
           // Pass in the ID of the object that is being removed so all references can
           // be counted in hook_file_references().
           $item['file_field_type'] = $entity_type;
           $item['file_field_id'] = $id;
           file_field_delete_file($item, $field, $entity_type, $id);
+        }
+      }
       /**
        * Define custom revision delete behavior for this module's field types.
+       *
        * This hook is invoked just before the data is deleted from field storage
        * in field_attach_delete_revision(), and will only be called for fieldable
        * types that are versioned.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entity
        *   The entity for the operation.
        * @param $field
        *   The field structure for the operation.
        * @param $instance
        *   The instance structure for $field on $entity's bundle.
        * @param $langcode
        *   The language associated with $items.
        * @param $items
        *   $entity->{$field['field_name']}[$langcode], or an empty array if unset.
        */
       function hook_field_delete_revision($entity_type, $entity, $field, $instance, $langcode, &$items) {
         list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
         foreach ($items as $delta => $item) {
           // For hook_file_references, remember that this file is being deleted.
           $item['file_field_name'] = $field['field_name'];
           if (file_field_delete_file($item, $field, $entity_type, $id)) {
             $items[$delta] = NULL;
+          }
+        }
+      }
       /**
        * Define custom prepare_translation behavior for this module's field types.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entity
        *   The entity for the operation.
        * @param $field
        *   The field structure for the operation.
        * @param $instance
        *   The instance structure for $field on $entity's bundle.
        * @param $langcode
        *   The language associated to $items.
        * @param $items
        *   $entity->{$field['field_name']}[$langcode], or an empty array if unset.
        * @param $source_entity
        *   The source entity from which field values are being copied.
        * @param $source_langcode
        *   The source language from which field values are being copied.
+       *
        * @ingroup field_language
        */
       function hook_field_prepare_translation($entity_type, $entity, $field, $instance, $langcode, &$items, $source_entity, $source_langcode) {
         // If the translating user is not permitted to use the assigned text format,
         // we must not expose the source values.
         $field_name = $field['field_name'];
         $formats = filter_formats();
         $format_id = $source_entity->{$field_name}[$source_langcode][0]['format'];
         if (!filter_access($formats[$format_id])) {
           $items = array();
+        }
+      }
       /**
        * Define what constitutes an empty item for a field type.
+       *
        * @param $item
        *   An item that may or may not be empty.
        * @param $field
        *   The field to which $item belongs.
+       *
        * @return
        *   TRUE if $field's type considers $item not to contain any data;
        *   FALSE otherwise.
        */
       function hook_field_is_empty($item, $field) {
         if (empty($item['value']) && (string) $item['value'] !== '0') {
           return TRUE;
+        }
         return FALSE;
+      }
       /**
        * @} End of "defgroup field_types".
        */
       /**
        * @defgroup field_widget Field Widget API
        * @{
        * Define Field API widget types.
+       *
        * Field API widgets specify how fields are displayed in edit forms. Fields of a
        * given @link field_types field type @endlink may be edited using more than one
        * widget. In this case, the Field UI module allows the site builder to choose
        * which widget to use. Widget types are defined by implementing
        * hook_field_widget_info().
+       *
        * Widgets are @link forms_api_reference.html Form API @endlink elements with
        * additional processing capabilities. Widget hooks are typically called by the
        * Field Attach API during the creation of the field form structure with
        * field_attach_form().
+       *
        * @see field
        * @see field_types
        * @see field_formatter
        */
       /**
        * Expose Field API widget types.
+       *
        * @return
        *   An array describing the widget types implemented by the module.
        *   The keys are widget type names. To avoid name clashes, widget type
        *   names should be prefixed with the name of the module that exposes them.
        *   The values are arrays describing the widget type, with the following
        *   key/value pairs:
        *   - label: The human-readable name of the widget type.
        *   - description: A short description for the widget type.
        *   - field types: An array of field types the widget supports.
        *   - settings: An array whose keys are the names of the settings available
        *     for the widget type, and whose values are the default values for those
        *     settings.
        *   - behaviors: (optional) An array describing behaviors of the widget, with
        *     the following elements:
        *     - multiple values: One of the following constants:
        *       - FIELD_BEHAVIOR_DEFAULT: (default) If the widget allows the input of
        *         one single field value (most common case). The widget will be
        *         repeated for each value input.
        *       - FIELD_BEHAVIOR_CUSTOM: If one single copy of the widget can receive
        *         several field values. Examples: checkboxes, multiple select,
        *         comma-separated textfield.
        *     - default value: One of the following constants:
        *       - FIELD_BEHAVIOR_DEFAULT: (default) If the widget accepts default
        *         values.
        *       - FIELD_BEHAVIOR_NONE: if the widget does not support default values.
        *   - weight: (optional) An integer to determine the weight of this widget
        *     relative to other widgets in the Field UI when selecting a widget for a
        *     given field instance.
+       *
        * @see hook_field_widget_info_alter()
        * @see hook_field_widget_form()
        * @see hook_field_widget_form_alter()
        * @see hook_field_widget_WIDGET_TYPE_form_alter()
        * @see hook_field_widget_error()
        * @see hook_field_widget_settings_form()
        */
       function hook_field_widget_info() {
         return array(
           'text_textfield' => array(
             'label' => t('Text field'),
             'field types' => array('text'),
             'settings' => array('size' => 60),
             'behaviors' => array(
               'multiple values' => FIELD_BEHAVIOR_DEFAULT,
               'default value' => FIELD_BEHAVIOR_DEFAULT,
             ),
           ),
           'text_textarea' => array(
             'label' => t('Text area (multiple rows)'),
             'field types' => array('text_long'),
             'settings' => array('rows' => 5),
             'behaviors' => array(
               'multiple values' => FIELD_BEHAVIOR_DEFAULT,
               'default value' => FIELD_BEHAVIOR_DEFAULT,
             ),
           ),
           'text_textarea_with_summary' => array(
             'label' => t('Text area with a summary'),
             'field types' => array('text_with_summary'),
             'settings' => array('rows' => 20, 'summary_rows' => 5),
             'behaviors' => array(
               'multiple values' => FIELD_BEHAVIOR_DEFAULT,
               'default value' => FIELD_BEHAVIOR_DEFAULT,
             ),
             // As an advanced widget, force it to sink to the bottom of the choices.
             'weight' => 2,
           ),
         );
+      }
       /**
        * Perform alterations on Field API widget types.
+       *
        * @param $info
        *   Array of informations on widget types exposed by hook_field_widget_info()
        *   implementations.
        */
       function hook_field_widget_info_alter(&$info) {
         // Add a setting to a widget type.
         $info['text_textfield']['settings'] += array(
           'mymodule_additional_setting' => 'default value',
         );
         // Let a new field type re-use an existing widget.
         $info['options_select']['field types'][] = 'my_field_type';
+      }
       /**
        * Return the form for a single field widget.
+       *
        * Field widget form elements should be based on the passed-in $element, which
        * contains the base form element properties derived from the field
        * configuration.
+       *
        * Field API will set the weight, field name and delta values for each form
        * element. If there are multiple values for this field, the Field API will
        * invoke this hook as many times as needed.
+       *
        * Note that, depending on the context in which the widget is being included
        * (regular entity form, field configuration form, advanced search form...),
        * the values for $field and $instance might be different from the "official"
        * definitions returned by field_info_field() and field_info_instance().
        * Examples: mono-value widget even if the field is multi-valued, non-required
        * widget even if the field is 'required'...
+       *
        * Therefore, the FAPI element callbacks (such as #process, #element_validate,
        * #value_callback...) used by the widget cannot use the field_info_field()
        * or field_info_instance() functions to retrieve the $field or $instance
        * definitions they should operate on. The field_widget_field() and
        * field_widget_instance() functions should be used instead to fetch the
        * current working definitions from $form_state, where Field API stores them.
+       *
        * Alternatively, hook_field_widget_form() can extract the needed specific
        * properties from $field and $instance and set them as ad-hoc
        * $element['#custom'] properties, for later use by its element callbacks.
+       *
        * Other modules may alter the form element provided by this function using
        * hook_field_widget_form_alter().
+       *
        * @param $form
        *   The form structure where widgets are being attached to. This might be a
        *   full form structure, or a sub-element of a larger form.
        * @param $form_state
        *   An associative array containing the current state of the form.
        * @param $field
        *   The field structure.
        * @param $instance
        *   The field instance.
        * @param $langcode
        *   The language associated with $items.
        * @param $items
        *   Array of default values for this field.
        * @param $delta
        *   The order of this item in the array of subelements (0, 1, 2, etc).
        * @param $element
        *   A form element array containing basic properties for the widget:
        *   - #entity_type: The name of the entity the field is attached to.
        *   - #bundle: The name of the field bundle the field is contained in.
        *   - #field_name: The name of the field.
        *   - #language: The language the field is being edited in.
        *   - #field_parents: The 'parents' space for the field in the form. Most
        *       widgets can simply overlook this property. This identifies the
        *       location where the field values are placed within
        *       $form_state['values'], and is used to access processing information
        *       for the field through the field_form_get_state() and
        *       field_form_set_state() functions.
        *   - #columns: A list of field storage columns of the field.
        *   - #title: The sanitized element label for the field instance, ready for
        *     output.
        *   - #description: The sanitized element description for the field instance,
        *     ready for output.
        *   - #required: A Boolean indicating whether the element value is required;
        *     for required multiple value fields, only the first widget's values are
        *     required.
        *   - #delta: The order of this item in the array of subelements; see $delta
        *     above.
+       *
        * @return
        *   The form elements for a single widget for this field.
+       *
        * @see field_widget_field()
        * @see field_widget_instance()
        * @see hook_field_widget_form_alter()
        * @see hook_field_widget_WIDGET_TYPE_form_alter()
        */
       function hook_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
         $element += array(
           '#type' => $instance['widget']['type'],
           '#default_value' => isset($items[$delta]) ? $items[$delta] : '',
         );
         return array('value' => $element);
+      }
       /**
        * Alter forms for field widgets provided by other modules.
+       *
        * @param $element
        *   The field widget form element as constructed by hook_field_widget_form().
        * @param $form_state
        *   An associative array containing the current state of the form.
        * @param $context
        *   An associative array containing the following key-value pairs, matching the
        *   arguments received by hook_field_widget_form():
        *   - form: The form structure to which widgets are being attached. This may be
        *     a full form structure, or a sub-element of a larger form.
        *   - field: The field structure.
        *   - instance: The field instance structure.
        *   - langcode: The language associated with $items.
        *   - items: Array of default values for this field.
        *   - delta: The order of this item in the array of subelements (0, 1, 2, etc).
+       *
        * @see hook_field_widget_form()
        * @see hook_field_widget_WIDGET_TYPE_form_alter()
        */
       function hook_field_widget_form_alter(&$element, &$form_state, $context) {
         // Add a css class to widget form elements for all fields of type mytype.
         if ($context['field']['type'] == 'mytype') {
           // Be sure not to overwrite existing attributes.
           $element['#attributes']['class'][] = 'myclass';
+        }
+      }
       /**
        * Alter widget forms for a specific widget provided by another module.
+       *
        * Modules can implement hook_field_widget_WIDGET_TYPE_form_alter() to modify a
        * specific widget form, rather than using hook_field_widget_form_alter() and
        * checking the widget type.
+       *
        * @param $element
        *   The field widget form element as constructed by hook_field_widget_form().
        * @param $form_state
        *   An associative array containing the current state of the form.
        * @param $context
        *   An associative array containing the following key-value pairs, matching the
        *   arguments received by hook_field_widget_form():
        *   - "form": The form structure where widgets are being attached to. This
        *     might be a full form structure, or a sub-element of a larger form.
        *   - "field": The field structure.
        *   - "instance": The field instance structure.
        *   - "langcode": The language associated with $items.
        *   - "items": Array of default values for this field.
        *   - "delta": The order of this item in the array of subelements (0, 1, 2,
        *     etc).
+       *
        * @see hook_field_widget_form()
        * @see hook_field_widget_form_alter()
        */
       function hook_field_widget_WIDGET_TYPE_form_alter(&$element, &$form_state, $context) {
         // Code here will only act on widgets of type WIDGET_TYPE.  For example,
         // hook_field_widget_mymodule_autocomplete_form_alter() will only act on
         // widgets of type 'mymodule_autocomplete'.
         $element['#autocomplete_path'] = 'mymodule/autocomplete_path';
+      }
       /**
        * Alters the widget properties of a field instance before it gets displayed.
+       *
        * Note that instead of hook_field_widget_properties_alter(), which is called
        * for all fields on all entity types,
        * hook_field_widget_properties_ENTITY_TYPE_alter() may be used to alter widget
        * properties for fields on a specific entity type only.
+       *
        * This hook is called once per field per added or edit entity. If the result
        * of the hook involves reading from the database, it is highly recommended to
        * statically cache the information.
+       *
        * @param $widget
        *   The instance's widget properties.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The entity type; e.g., 'node' or 'user'.
        *   - entity: The entity object.
        *   - field: The field that the widget belongs to.
        *   - instance: The instance of the field.
+       *
        * @see hook_field_widget_properties_ENTITY_TYPE_alter()
        */
       function hook_field_widget_properties_alter(&$widget, $context) {
         // Change a widget's type according to the time of day.
         $field = $context['field'];
         if ($context['entity_type'] == 'node' && $field['field_name'] == 'field_foo') {
           $time = date('H');
           $widget['type'] = $time < 12 ? 'widget_am' : 'widget_pm';
+        }
+      }
       /**
        * Flag a field-level validation error.
+       *
        * @param $element
        *   An array containing the form element for the widget. The error needs to be
        *   flagged on the right sub-element, according to the widget's internal
        *   structure.
        * @param $error
        *   An associative array with the following key-value pairs, as returned by
        *   hook_field_validate():
        *   - error: the error code. Complex widgets might need to report different
        *     errors to different form elements inside the widget.
        *   - message: the human readable message to be displayed.
        * @param $form
        *   The form structure where field elements are attached to. This might be a
        *   full form structure, or a sub-element of a larger form.
        * @param $form_state
        *   An associative array containing the current state of the form.
        */
       function hook_field_widget_error($element, $error, $form, &$form_state) {
         form_error($element, $error['message']);
+      }
       /**
        * @} End of "defgroup field_widget".
        */
       /**
        * @defgroup field_formatter Field Formatter API
        * @{
        * Define Field API formatter types.
+       *
        * Field API formatters specify how fields are displayed when the entity to
        * which the field is attached is displayed. Fields of a given
        * @link field_types field type @endlink may be displayed using more than one
        * formatter. In this case, the Field UI module allows the site builder to
        * choose which formatter to use. Field formatters are defined by implementing
        * hook_field_formatter_info().
+       *
        * @see field
        * @see field_types
        * @see field_widget
        */
       /**
        * Expose Field API formatter types.
+       *
        * Formatters handle the display of field values. Formatter hooks are typically
        * called by the Field Attach API field_attach_prepare_view() and
        * field_attach_view() functions.
+       *
        * @return
        *   An array describing the formatter types implemented by the module.
        *   The keys are formatter type names. To avoid name clashes, formatter type
        *   names should be prefixed with the name of the module that exposes them.
        *   The values are arrays describing the formatter type, with the following
        *   key/value pairs:
        *   - label: The human-readable name of the formatter type.
        *   - description: A short description for the formatter type.
        *   - field types: An array of field types the formatter supports.
        *   - settings: An array whose keys are the names of the settings available
        *     for the formatter type, and whose values are the default values for
        *     those settings.
+       *
        * @see hook_field_formatter_info_alter()
        * @see hook_field_formatter_view()
        * @see hook_field_formatter_prepare_view()
        */
       function hook_field_formatter_info() {
         return array(
           'text_default' => array(
             'label' => t('Default'),
             'field types' => array('text', 'text_long', 'text_with_summary'),
           ),
           'text_plain' => array(
             'label' => t('Plain text'),
             'field types' => array('text', 'text_long', 'text_with_summary'),
           ),
           // The text_trimmed formatter displays the trimmed version of the
           // full element of the field. It is intended to be used with text
           // and text_long fields. It also works with text_with_summary
           // fields though the text_summary_or_trimmed formatter makes more
           // sense for that field type.
           'text_trimmed' => array(
             'label' => t('Trimmed'),
             'field types' => array('text', 'text_long', 'text_with_summary'),
           ),
           // The 'summary or trimmed' field formatter for text_with_summary
           // fields displays returns the summary element of the field or, if
           // the summary is empty, the trimmed version of the full element
           // of the field.
           'text_summary_or_trimmed' => array(
             'label' => t('Summary or trimmed'),
             'field types' => array('text_with_summary'),
           ),
         );
+      }
       /**
        * Perform alterations on Field API formatter types.
+       *
        * @param $info
        *   An array of information on formatter types exposed by
        *   hook_field_formatter_info() implementations.
        */
       function hook_field_formatter_info_alter(&$info) {
         // Add a setting to a formatter type.
         $info['text_default']['settings'] += array(
           'mymodule_additional_setting' => 'default value',
         );
         // Let a new field type re-use an existing formatter.
         $info['text_default']['field types'][] = 'my_field_type';
+      }
       /**
        * Allow formatters to load information for field values being displayed.
+       *
        * This should be used when a formatter needs to load additional information
        * from the database in order to render a field, for example a reference field
        * which displays properties of the referenced entities such as name or type.
+       *
        * This hook is called after the field type's own hook_field_prepare_view().
+       *
        * Unlike most other field hooks, this hook operates on multiple entities. The
        * $entities, $instances and $items parameters are arrays keyed by entity ID.
        * For performance reasons, information for all available entities should be
        * loaded in a single query where possible.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entities
        *   Array of entities being displayed, keyed by entity ID.
        * @param $field
        *   The field structure for the operation.
        * @param $instances
        *   Array of instance structures for $field for each entity, keyed by entity
        *   ID.
        * @param $langcode
        *   The language the field values are to be shown in. If no language is
        *   provided the current language is used.
        * @param $items
        *   Array of field values for the entities, keyed by entity ID.
        * @param $displays
        *   Array of display settings to use for each entity, keyed by entity ID.
+       *
        * @return
        *   Changes or additions to field values are done by altering the $items
        *   parameter by reference.
        */
       function hook_field_formatter_prepare_view($entity_type, $entities, $field, $instances, $langcode, &$items, $displays) {
         $tids = array();
         // Collect every possible term attached to any of the fieldable entities.
         foreach ($entities as $id => $entity) {
           foreach ($items[$id] as $delta => $item) {
             // Force the array key to prevent duplicates.
             $tids[$item['tid']] = $item['tid'];
+          }
+        }
         if ($tids) {
           $terms = taxonomy_term_load_multiple($tids);
           // Iterate through the fieldable entities again to attach the loaded term
           // data.
           foreach ($entities as $id => $entity) {
             $rekey = FALSE;
             foreach ($items[$id] as $delta => $item) {
               // Check whether the taxonomy term field instance value could be loaded.
               if (isset($terms[$item['tid']])) {
                 // Replace the instance value with the term data.
                 $items[$id][$delta]['taxonomy_term'] = $terms[$item['tid']];
+              }
               // Otherwise, unset the instance value, since the term does not exist.
               else {
                 unset($items[$id][$delta]);
                 $rekey = TRUE;
+              }
+            }
             if ($rekey) {
               // Rekey the items array.
               $items[$id] = array_values($items[$id]);
+            }
+          }
+        }
+      }
       /**
        * Build a renderable array for a field value.
+       *
        * @param $entity_type
        *   The type of $entity.
        * @param $entity
        *   The entity being displayed.
        * @param $field
        *   The field structure.
        * @param $instance
        *   The field instance.
        * @param $langcode
        *   The language associated with $items.
        * @param $items
        *   Array of values for this field.
        * @param $display
        *   The display settings to use, as found in the 'display' entry of instance
        *   definitions. The array notably contains the following keys and values;
        *   - type: The name of the formatter to use.
        *   - settings: The array of formatter settings.
+       *
        * @return
        *   A renderable array for the $items, as an array of child elements keyed
        *   by numeric indexes starting from 0.
        */
       function hook_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
         $element = array();
         $settings = $display['settings'];
         switch ($display['type']) {
           case 'sample_field_formatter_simple':
             // Common case: each value is displayed individually in a sub-element
             // keyed by delta. The field.tpl.php template specifies the markup
             // wrapping each value.
             foreach ($items as $delta => $item) {
               $element[$delta] = array('#markup' => $settings['some_setting'] . $item['value']);
+            }
             break;
           case 'sample_field_formatter_themeable':
             // More elaborate formatters can defer to a theme function for easier
             // customization.
             foreach ($items as $delta => $item) {
               $element[$delta] = array(
                 '#theme' => 'mymodule_theme_sample_field_formatter_themeable',
                 '#data' => $item['value'],
                 '#some_setting' => $settings['some_setting'],
               );
+            }
             break;
           case 'sample_field_formatter_combined':
             // Some formatters might need to display all values within a single piece
             // of markup.
             $rows = array();
             foreach ($items as $delta => $item) {
               $rows[] = array($delta, $item['value']);
+            }
             $element[0] = array(
               '#theme' => 'table',
               '#header' => array(t('Delta'), t('Value')),
               '#rows' => $rows,
             );
             break;
+        }
         return $element;
+      }
       /**
        * @} End of "defgroup field_formatter".
        */
       /**
        * @addtogroup field_attach
        * @{
        */
       /**
        * Act on field_attach_form().
+       *
        * This hook is invoked after the field module has performed the operation.
        * Implementing modules should alter the $form or $form_state parameters.
+       *
        * @param $entity_type
        *   The type of $entity; for example, 'node' or 'user'.
        * @param $entity
        *   The entity for which an edit form is being built.
        * @param $form
        *   The form structure where field elements are attached to. This might be a
        *   full form structure, or a sub-element of a larger form. The
        *   $form['#parents'] property can be used to identify the corresponding part
        *   of $form_state['values']. Hook implementations that need to act on the
        *   top-level properties of the global form (like #submit, #validate...) can
        *   add a #process callback to the array received in the $form parameter, and
        *   act on the $complete_form parameter in the process callback.
        * @param $form_state
        *   An associative array containing the current state of the form.
        * @param $langcode
        *   The language the field values are going to be entered in. If no language
        *   is provided the default site language will be used.
        */
       function hook_field_attach_form($entity_type, $entity, &$form, &$form_state, $langcode) {
         // Add a checkbox allowing a given field to be emptied.
         // See hook_field_attach_submit() for the corresponding processing code.
         $form['empty_field_foo'] = array(
           '#type' => 'checkbox',
           '#title' => t("Empty the 'field_foo' field"),
         );
+      }
       /**
        * Act on field_attach_load().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * Unlike other field_attach hooks, this hook accounts for 'multiple loads'.
        * Instead of the usual $entity parameter, it accepts an array of entities,
        * indexed by entity ID. For performance reasons, information for all available
        * entities should be loaded in a single query where possible.
+       *
        * The changes made to the entities' field values get cached by the field cache
        * for subsequent loads.
+       *
        * See field_attach_load() for details and arguments.
        */
       function hook_field_attach_load($entity_type, $entities, $age, $options) {
         // @todo Needs function body.
+      }
       /**
        * Act on field_attach_validate().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * See field_attach_validate() for details and arguments.
+       *
        * @param $entity_type
        *   The type of $entity; e.g., 'node' or 'user'.
        * @param $entity
        *   The entity with fields to validate.
        * @param array $errors
        *   The array of errors (keyed by field name, language code, and delta) that
        *   have already been reported for the entity. The function should add its
        *   errors to this array. Each error is an associative array with the following
        *   keys and values:
        *   - error: An error code (should be a string prefixed with the module name).
        *   - message: The human readable message to be displayed.
        */
       function hook_field_attach_validate($entity_type, $entity, &$errors) {
         // Make sure any images in article nodes have an alt text.
         if ($entity_type == 'node' && $entity->type == 'article' && !empty($entity->field_image)) {
           foreach ($entity->field_image as $langcode => $items) {
             foreach ($items as $delta => $item) {
               if (!empty($item['fid']) && empty($item['alt'])) {
                 $errors['field_image'][$langcode][$delta][] = array(
                   'error' => 'field_example_invalid',
                   'message' => t('All images in articles need to have an alternative text set.'),
                 );
+              }
+            }
+          }
+        }
+      }
       /**
        * Act on field_attach_submit().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * @param $entity_type
        *   The type of $entity; for example, 'node' or 'user'.
        * @param $entity
        *   The entity for which an edit form is being submitted. The incoming form
        *   values have been extracted as field values of the $entity object.
        * @param $form
        *   The form structure where field elements are attached to. This might be a
        *   full form structure, or a sub-part of a larger form. The $form['#parents']
        *   property can be used to identify the corresponding part of
        *   $form_state['values'].
        * @param $form_state
        *   An associative array containing the current state of the form.
        */
       function hook_field_attach_submit($entity_type, $entity, $form, &$form_state) {
         // Sample case of an 'Empty the field' checkbox added on the form, allowing
         // a given field to be emptied.
         $values = drupal_array_get_nested_value($form_state['values'], $form['#parents']);
         if (!empty($values['empty_field_foo'])) {
           unset($entity->field_foo);
+        }
+      }
       /**
        * Act on field_attach_presave().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * See field_attach_presave() for details and arguments.
        */
       function hook_field_attach_presave($entity_type, $entity) {
         // @todo Needs function body.
+      }
       /**
        * Act on field_attach_insert().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * See field_attach_insert() for details and arguments.
        */
       function hook_field_attach_insert($entity_type, $entity) {
         // @todo Needs function body.
+      }
       /**
        * Act on field_attach_update().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * See field_attach_update() for details and arguments.
        */
       function hook_field_attach_update($entity_type, $entity) {
         // @todo Needs function body.
+      }
       /**
        * Alter field_attach_preprocess() variables.
+       *
        * This hook is invoked while preprocessing the field.tpl.php template file
        * in field_attach_preprocess().
+       *
        * @param $variables
        *   The variables array is passed by reference and will be populated with field
        *   values.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The type of $entity; for example, 'node' or 'user'.
        *   - entity: The entity with fields to render.
        *   - element: The structured array containing the values ready for rendering.
        */
       function hook_field_attach_preprocess_alter(&$variables, $context) {
         // @todo Needs function body.
+      }
       /**
        * Act on field_attach_delete().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * See field_attach_delete() for details and arguments.
        */
       function hook_field_attach_delete($entity_type, $entity) {
         // @todo Needs function body.
+      }
       /**
        * Act on field_attach_delete_revision().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * See field_attach_delete_revision() for details and arguments.
        */
       function hook_field_attach_delete_revision($entity_type, $entity) {
         // @todo Needs function body.
+      }
       /**
        * Act on field_purge_data().
+       *
        * This hook is invoked in field_purge_data() and allows modules to act on
        * purging data from a single field pseudo-entity. For example, if a module
        * relates data in the field with its own data, it may purge its own data
        * during this process as well.
+       *
        * @param $entity_type
        *   The type of $entity; for example, 'node' or 'user'.
        * @param $entity
        *   The pseudo-entity whose field data is being purged.
        * @param $field
        *   The (possibly deleted) field whose data is being purged.
        * @param $instance
        *   The deleted field instance whose data is being purged.
+       *
        * @see @link field_purge Field API bulk data deletion @endlink
        * @see field_purge_data()
        */
       function hook_field_attach_purge($entity_type, $entity, $field, $instance) {
         // find the corresponding data in mymodule and purge it
         if ($entity_type == 'node' && $field->field_name == 'my_field_name') {
           mymodule_remove_mydata($entity->nid);
+        }
+      }
       /**
        * Perform alterations on field_attach_view() or field_view_field().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * @param $output
        *   The structured content array tree for all of the entity's fields.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The type of $entity; for example, 'node' or 'user'.
        *   - entity: The entity with fields to render.
        *   - view_mode: View mode; for example, 'full' or 'teaser'.
        *   - display: Either a view mode string or an array of display settings. If
        *     this hook is being invoked from field_attach_view(), the 'display'
        *     element is set to the view mode string. If this hook is being invoked
        *     from field_view_field(), this element is set to the $display argument
        *     and the view_mode element is set to '_custom'. See field_view_field()
        *     for more information on what its $display argument contains.
        *   - language: The language code used for rendering.
        */
       function hook_field_attach_view_alter(&$output, $context) {
         // Append RDF term mappings on displayed taxonomy links.
         foreach (element_children($output) as $field_name) {
           $element = &$output[$field_name];
           if ($element['#field_type'] == 'taxonomy_term_reference' && $element['#formatter'] == 'taxonomy_term_reference_link') {
             foreach ($element['#items'] as $delta => $item) {
               $term = $item['taxonomy_term'];
               if (!empty($term->rdf_mapping['rdftype'])) {
                 $element[$delta]['#options']['attributes']['typeof'] = $term->rdf_mapping['rdftype'];
+              }
               if (!empty($term->rdf_mapping['name']['predicates'])) {
                 $element[$delta]['#options']['attributes']['property'] = $term->rdf_mapping['name']['predicates'];
+              }
+            }
+          }
+        }
+      }
       /**
        * Perform alterations on field_attach_prepare_translation().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * @param $entity
        *   The entity being prepared for translation.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The type of $entity; e.g. 'node' or 'user'.
        *   - langcode: The language the entity has to be translated in.
        *   - source_entity: The entity holding the field values to be translated.
        *   - source_langcode: The source language from which translate.
        */
       function hook_field_attach_prepare_translation_alter(&$entity, $context) {
         if ($context['entity_type'] == 'custom_entity_type') {
           $entity->custom_field = $context['source_entity']->custom_field;
+        }
+      }
       /**
        * Perform alterations on field_language() values.
+       *
        * This hook is invoked to alter the array of display languages for the given
        * entity.
+       *
        * @param $display_language
        *   A reference to an array of language codes keyed by field name.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The type of the entity to be displayed.
        *   - entity: The entity with fields to render.
        *   - langcode: The language code $entity has to be displayed in.
+       *
        * @ingroup field_language
        */
       function hook_field_language_alter(&$display_language, $context) {
         // Do not apply core language fallback rules if they are disabled or if Locale
         // is not registered as a translation handler.
         if (variable_get('locale_field_language_fallback', TRUE) && field_has_translation_handler($context['entity_type'], 'locale')) {
           locale_field_language_fallback($display_language, $context['entity'], $context['language']);
+        }
+      }
       /**
        * Alter field_available_languages() values.
+       *
        * This hook is invoked from field_available_languages() to allow modules to
        * alter the array of available languages for the given field.
+       *
        * @param $languages
        *   A reference to an array of language codes to be made available.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The type of the entity the field is attached to.
        *   - field: A field data structure.
+       *
        * @ingroup field_language
        */
       function hook_field_available_languages_alter(&$languages, $context) {
         // Add an unavailable language.
         $languages[] = 'xx';
         // Remove an available language.
         $index = array_search('yy', $languages);
         unset($languages[$index]);
+      }
       /**
        * Act on field_attach_create_bundle().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * See field_attach_create_bundle() for details and arguments.
        */
       function hook_field_attach_create_bundle($entity_type, $bundle) {
         // When a new bundle is created, the menu needs to be rebuilt to add the
         // Field UI menu item tabs.
         variable_set('menu_rebuild_needed', TRUE);
+      }
       /**
        * Act on field_attach_rename_bundle().
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * See field_attach_rename_bundle() for details and arguments.
        */
       function hook_field_attach_rename_bundle($entity_type, $bundle_old, $bundle_new) {
         // Update the extra weights variable with new information.
         if ($bundle_old !== $bundle_new) {
           $extra_weights = variable_get('field_extra_weights', array());
           if (isset($info[$entity_type][$bundle_old])) {
             $extra_weights[$entity_type][$bundle_new] = $extra_weights[$entity_type][$bundle_old];
             unset($extra_weights[$entity_type][$bundle_old]);
             variable_set('field_extra_weights', $extra_weights);
+          }
+        }
+      }
       /**
        * Act on field_attach_delete_bundle.
+       *
        * This hook is invoked after the field module has performed the operation.
+       *
        * @param $entity_type
        *   The type of entity; for example, 'node' or 'user'.
        * @param $bundle
        *   The name of the bundle that was just deleted.
        * @param $instances
        *   An array of all instances that existed for the bundle before it was
        *   deleted.
        */
       function hook_field_attach_delete_bundle($entity_type, $bundle, $instances) {
         // Remove the extra weights variable information for this bundle.
         $extra_weights = variable_get('field_extra_weights', array());
         if (isset($extra_weights[$entity_type][$bundle])) {
           unset($extra_weights[$entity_type][$bundle]);
           variable_set('field_extra_weights', $extra_weights);
+        }
+      }
       /**
        * @} End of "addtogroup field_attach".
        */
       /**
        * @addtogroup field_storage
        * @{
        */
       /**
        * Expose Field API storage backends.
+       *
        * @return
        *   An array describing the storage backends implemented by the module.
        *   The keys are storage backend names. To avoid name clashes, storage backend
        *   names should be prefixed with the name of the module that exposes them.
        *   The values are arrays describing the storage backend, with the following
        *   key/value pairs:
        *   - label: The human-readable name of the storage backend.
        *   - description: A short description for the storage backend.
        *   - settings: An array whose keys are the names of the settings available
        *     for the storage backend, and whose values are the default values for
        *     those settings.
        */
       function hook_field_storage_info() {
         return array(
           'field_sql_storage' => array(
             'label' => t('Default SQL storage'),
             'description' => t('Stores fields in the local SQL database, using per-field tables.'),
             'settings' => array(),
           ),
         );
+      }
       /**
        * Perform alterations on Field API storage types.
+       *
        * @param $info
        *   Array of informations on storage types exposed by
        *   hook_field_field_storage_info() implementations.
        */
       function hook_field_storage_info_alter(&$info) {
         // Add a setting to a storage type.
         $info['field_sql_storage']['settings'] += array(
           'mymodule_additional_setting' => 'default value',
         );
+      }
       /**
        * Reveal the internal details about the storage for a field.
+       *
        * For example, an SQL storage module might return the Schema API structure for
        * the table. A key/value storage module might return the server name,
        * authentication credentials, and bin name.
+       *
        * Field storage modules are not obligated to implement this hook. Modules
        * that rely on these details must only use them for read operations.
+       *
        * @param $field
        *   A field structure.
+       *
        * @return
        *   An array of details.
        *    - The first dimension is a store type (sql, solr, etc).
        *    - The second dimension indicates the age of the values in the store
        *      FIELD_LOAD_CURRENT or FIELD_LOAD_REVISION.
        *    - Other dimensions are specific to the field storage module.
+       *
        * @see hook_field_storage_details_alter()
        */
       function hook_field_storage_details($field) {
         $details = array();
         // Add field columns.
         foreach ((array) $field['columns'] as $column_name => $attributes) {
           $real_name = _field_sql_storage_columnname($field['field_name'], $column_name);
           $columns[$column_name] = $real_name;
+        }
         return array(
           'sql' => array(
             FIELD_LOAD_CURRENT => array(
               _field_sql_storage_tablename($field) => $columns,
             ),
             FIELD_LOAD_REVISION => array(
               _field_sql_storage_revision_tablename($field) => $columns,
             ),
           ),
         );
+      }
       /**
        * Perform alterations on Field API storage details.
+       *
        * @param $details
        *   An array of storage details for fields as exposed by
        *   hook_field_storage_details() implementations.
        * @param $field
        *   A field structure.
+       *
        * @see hook_field_storage_details()
        */
       function hook_field_storage_details_alter(&$details, $field) {
         if ($field['field_name'] == 'field_of_interest') {
           $columns = array();
           foreach ((array) $field['columns'] as $column_name => $attributes) {
             $columns[$column_name] = $column_name;
+          }
           $details['drupal_variables'] = array(
             FIELD_LOAD_CURRENT => array(
               'moon' => $columns,
             ),
             FIELD_LOAD_REVISION => array(
               'mars' => $columns,
             ),
           );
+        }
+      }
       /**
        * Load field data for a set of entities.
+       *
        * This hook is invoked from field_attach_load() to ask the field storage
        * module to load field data.
+       *
        * Modules implementing this hook should load field values and add them to
        * objects in $entities. Fields with no values should be added as empty
        * arrays.
+       *
        * @param $entity_type
        *   The type of entity, such as 'node' or 'user'.
        * @param $entities
        *   The array of entity objects to add fields to, keyed by entity ID.
        * @param $age
        *   FIELD_LOAD_CURRENT to load the most recent revision for all fields, or
        *   FIELD_LOAD_REVISION to load the version indicated by each entity.
        * @param $fields
        *   An array listing the fields to be loaded. The keys of the array are field
        *   IDs, and the values of the array are the entity IDs (or revision IDs,
        *   depending on the $age parameter) to add each field to.
        * @param $options
        *   An associative array of additional options, with the following keys:
        *   - deleted: If TRUE, deleted fields should be loaded as well as
        *     non-deleted fields. If unset or FALSE, only non-deleted fields should be
        *     loaded.
        */
       function hook_field_storage_load($entity_type, $entities, $age, $fields, $options) {
         $load_current = $age == FIELD_LOAD_CURRENT;
         foreach ($fields as $field_id => $ids) {
           // By the time this hook runs, the relevant field definitions have been
           // populated and cached in FieldInfo, so calling field_info_field_by_id()
           // on each field individually is more efficient than loading all fields in
           // memory upfront with field_info_field_by_ids().
           $field = field_info_field_by_id($field_id);
           $field_name = $field['field_name'];
           $table = $load_current ? _field_sql_storage_tablename($field) : _field_sql_storage_revision_tablename($field);
           $query = db_select($table, 't')
             ->fields('t')
             ->condition('entity_type', $entity_type)
             ->condition($load_current ? 'entity_id' : 'revision_id', $ids, 'IN')
             ->condition('language', field_available_languages($entity_type, $field), 'IN')
             ->orderBy('delta');
           if (empty($options['deleted'])) {
             $query->condition('deleted', 0);
+          }
           $results = $query->execute();
           $delta_count = array();
           foreach ($results as $row) {
             if (!isset($delta_count[$row->entity_id][$row->language])) {
               $delta_count[$row->entity_id][$row->language] = 0;
+            }
             if ($field['cardinality'] == FIELD_CARDINALITY_UNLIMITED || $delta_count[$row->entity_id][$row->language] < $field['cardinality']) {
               $item = array();
               // For each column declared by the field, populate the item
               // from the prefixed database column.
               foreach ($field['columns'] as $column => $attributes) {
                 $column_name = _field_sql_storage_columnname($field_name, $column);
                 $item[$column] = $row->$column_name;
+              }
               // Add the item to the field values for the entity.
               $entities[$row->entity_id]->{$field_name}[$row->language][] = $item;
               $delta_count[$row->entity_id][$row->language]++;
+            }
+          }
+        }
+      }
       /**
        * Write field data for an entity.
+       *
        * This hook is invoked from field_attach_insert() and field_attach_update(),
        * to ask the field storage module to save field data.
+       *
        * @param $entity_type
        *   The entity type of entity, such as 'node' or 'user'.
        * @param $entity
        *   The entity on which to operate.
        * @param $op
        *   FIELD_STORAGE_UPDATE when updating an existing entity,
        *   FIELD_STORAGE_INSERT when inserting a new entity.
        * @param $fields
        *   An array listing the fields to be written. The keys and values of the
        *   array are field IDs.
        */
       function hook_field_storage_write($entity_type, $entity, $op, $fields) {
         list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
         if (!isset($vid)) {
           $vid = $id;
+        }
         foreach ($fields as $field_id) {
           $field = field_info_field_by_id($field_id);
           $field_name = $field['field_name'];
           $table_name = _field_sql_storage_tablename($field);
           $revision_name = _field_sql_storage_revision_tablename($field);
           $all_languages = field_available_languages($entity_type, $field);
           $field_languages = array_intersect($all_languages, array_keys((array) $entity->$field_name));
           // Delete and insert, rather than update, in case a value was added.
           if ($op == FIELD_STORAGE_UPDATE) {
             // Delete languages present in the incoming $entity->$field_name.
             // Delete all languages if $entity->$field_name is empty.
             $languages = !empty($entity->$field_name) ? $field_languages : $all_languages;
             if ($languages) {
               db_delete($table_name)
                 ->condition('entity_type', $entity_type)
                 ->condition('entity_id', $id)
                 ->condition('language', $languages, 'IN')
                 ->execute();
               db_delete($revision_name)
                 ->condition('entity_type', $entity_type)
                 ->condition('entity_id', $id)
                 ->condition('revision_id', $vid)
                 ->condition('language', $languages, 'IN')
                 ->execute();
+            }
+          }
           // Prepare the multi-insert query.
           $do_insert = FALSE;
           $columns = array('entity_type', 'entity_id', 'revision_id', 'bundle', 'delta', 'language');
           foreach ($field['columns'] as $column => $attributes) {
             $columns[] = _field_sql_storage_columnname($field_name, $column);
+          }
           $query = db_insert($table_name)->fields($columns);
           $revision_query = db_insert($revision_name)->fields($columns);
           foreach ($field_languages as $langcode) {
             $items = (array) $entity->{$field_name}[$langcode];
             $delta_count = 0;
             foreach ($items as $delta => $item) {
               // We now know we have something to insert.
               $do_insert = TRUE;
               $record = array(
                 'entity_type' => $entity_type,
                 'entity_id' => $id,
                 'revision_id' => $vid,
                 'bundle' => $bundle,
                 'delta' => $delta,
                 'language' => $langcode,
               );
               foreach ($field['columns'] as $column => $attributes) {
                 $record[_field_sql_storage_columnname($field_name, $column)] = isset($item[$column]) ? $item[$column] : NULL;
+              }
               $query->values($record);
               if (isset($vid)) {
                 $revision_query->values($record);
+              }
               if ($field['cardinality'] != FIELD_CARDINALITY_UNLIMITED && ++$delta_count == $field['cardinality']) {
                 break;
+              }
+            }
+          }
           // Execute the query if we have values to insert.
           if ($do_insert) {
             $query->execute();
             $revision_query->execute();
+          }
+        }
+      }
       /**
        * Delete all field data for an entity.
+       *
        * This hook is invoked from field_attach_delete() to ask the field storage
        * module to delete field data.
+       *
        * @param $entity_type
        *   The entity type of entity, such as 'node' or 'user'.
        * @param $entity
        *   The entity on which to operate.
        * @param $fields
        *   An array listing the fields to delete. The keys and values of the
        *   array are field IDs.
        */
       function hook_field_storage_delete($entity_type, $entity, $fields) {
         list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
         foreach (field_info_instances($entity_type, $bundle) as $instance) {
           if (isset($fields[$instance['field_id']])) {
             $field = field_info_field_by_id($instance['field_id']);
             field_sql_storage_field_storage_purge($entity_type, $entity, $field, $instance);
+          }
+        }
+      }
       /**
        * Delete a single revision of field data for an entity.
+       *
        * This hook is invoked from field_attach_delete_revision() to ask the field
        * storage module to delete field revision data.
+       *
        * Deleting the current (most recently written) revision is not
        * allowed as has undefined results.
+       *
        * @param $entity_type
        *   The entity type of entity, such as 'node' or 'user'.
        * @param $entity
        *   The entity on which to operate. The revision to delete is
        *   indicated by the entity's revision ID property, as identified by
        *   hook_fieldable_info() for $entity_type.
        * @param $fields
        *   An array listing the fields to delete. The keys and values of the
        *   array are field IDs.
        */
       function hook_field_storage_delete_revision($entity_type, $entity, $fields) {
         list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
         if (isset($vid)) {
           foreach ($fields as $field_id) {
             $field = field_info_field_by_id($field_id);
             $revision_name = _field_sql_storage_revision_tablename($field);
             db_delete($revision_name)
               ->condition('entity_type', $entity_type)
               ->condition('entity_id', $id)
               ->condition('revision_id', $vid)
               ->execute();
+          }
+        }
+      }
       /**
        * Execute an EntityFieldQuery.
+       *
        * This hook is called to find the entities having certain entity and field
        * conditions and sort them in the given field order. If the field storage
        * engine also handles property sorts and orders, it should unset those
        * properties in the called object to signal that those have been handled.
+       *
        * @param EntityFieldQuery $query
        *   An EntityFieldQuery.
+       *
        * @return
        *   See EntityFieldQuery::execute() for the return values.
        */
       function hook_field_storage_query($query) {
         $groups = array();
         if ($query->age == FIELD_LOAD_CURRENT) {
           $tablename_function = '_field_sql_storage_tablename';
           $id_key = 'entity_id';
+        }
         else {
           $tablename_function = '_field_sql_storage_revision_tablename';
           $id_key = 'revision_id';
+        }
         $table_aliases = array();
         // Add tables for the fields used.
         foreach ($query->fields as $key => $field) {
           $tablename = $tablename_function($field);
           // Every field needs a new table.
           $table_alias = $tablename . $key;
           $table_aliases[$key] = $table_alias;
           if ($key) {
             $select_query->join($tablename, $table_alias, "$table_alias.entity_type = $field_base_table.entity_type AND $table_alias.$id_key = $field_base_table.$id_key");
+          }
           else {
             $select_query = db_select($tablename, $table_alias);
             $select_query->addTag('entity_field_access');
             $select_query->addMetaData('base_table', $tablename);
             $select_query->fields($table_alias, array('entity_type', 'entity_id', 'revision_id', 'bundle'));
             $field_base_table = $table_alias;
+          }
           if ($field['cardinality'] != 1) {
             $select_query->distinct();
+          }
+        }
         // Add field conditions.
         foreach ($query->fieldConditions as $key => $condition) {
           $table_alias = $table_aliases[$key];
           $field = $condition['field'];
           // Add the specified condition.
           $sql_field = "$table_alias." . _field_sql_storage_columnname($field['field_name'], $condition['column']);
           $query->addCondition($select_query, $sql_field, $condition);
           // Add delta / language group conditions.
           foreach (array('delta', 'language') as $column) {
             if (isset($condition[$column . '_group'])) {
               $group_name = $condition[$column . '_group'];
               if (!isset($groups[$column][$group_name])) {
                 $groups[$column][$group_name] = $table_alias;
+              }
               else {
                 $select_query->where("$table_alias.$column = " . $groups[$column][$group_name] . ".$column");
+              }
+            }
+          }
+        }
         if (isset($query->deleted)) {
           $select_query->condition("$field_base_table.deleted", (int) $query->deleted);
+        }
         // Is there a need to sort the query by property?
         $has_property_order = FALSE;
         foreach ($query->order as $order) {
           if ($order['type'] == 'property') {
             $has_property_order = TRUE;
+          }
+        }
         if ($query->propertyConditions || $has_property_order) {
           if (empty($query->entityConditions['entity_type']['value'])) {
             throw new EntityFieldQueryException('Property conditions and orders must have an entity type defined.');
+          }
           $entity_type = $query->entityConditions['entity_type']['value'];
           $entity_base_table = _field_sql_storage_query_join_entity($select_query, $entity_type, $field_base_table);
           $query->entityConditions['entity_type']['operator'] = '=';
           foreach ($query->propertyConditions as $property_condition) {
             $query->addCondition($select_query, "$entity_base_table." . $property_condition['column'], $property_condition);
+          }
+        }
         foreach ($query->entityConditions as $key => $condition) {
           $query->addCondition($select_query, "$field_base_table.$key", $condition);
+        }
         // Order the query.
         foreach ($query->order as $order) {
           if ($order['type'] == 'entity') {
             $key = $order['specifier'];
             $select_query->orderBy("$field_base_table.$key", $order['direction']);
+          }
           elseif ($order['type'] == 'field') {
             $specifier = $order['specifier'];
             $field = $specifier['field'];
             $table_alias = $table_aliases[$specifier['index']];
             $sql_field = "$table_alias." . _field_sql_storage_columnname($field['field_name'], $specifier['column']);
             $select_query->orderBy($sql_field, $order['direction']);
+          }
           elseif ($order['type'] == 'property') {
             $select_query->orderBy("$entity_base_table." . $order['specifier'], $order['direction']);
+          }
+        }
         return $query->finishQuery($select_query, $id_key);
+      }
       /**
        * Act on creation of a new field.
+       *
        * This hook is invoked from field_create_field() to ask the field storage
        * module to save field information and prepare for storing field instances.
        * If there is a problem, the field storage module should throw an exception.
+       *
        * @param $field
        *   The field structure being created.
        */
       function hook_field_storage_create_field($field) {
         $schema = _field_sql_storage_schema($field);
         foreach ($schema as $name => $table) {
           db_create_table($name, $table);
+        }
         drupal_get_schema(NULL, TRUE);
+      }
       /**
        * Act on deletion of a field.
+       *
        * This hook is invoked from field_delete_field() to ask the field storage
        * module to mark all information stored in the field for deletion.
+       *
        * @param $field
        *   The field being deleted.
        */
       function hook_field_storage_delete_field($field) {
         // Mark all data associated with the field for deletion.
         $field['deleted'] = 0;
         $table = _field_sql_storage_tablename($field);
         $revision_table = _field_sql_storage_revision_tablename($field);
         db_update($table)
           ->fields(array('deleted' => 1))
           ->execute();
         // Move the table to a unique name while the table contents are being deleted.
         $field['deleted'] = 1;
         $new_table = _field_sql_storage_tablename($field);
         $revision_new_table = _field_sql_storage_revision_tablename($field);
         db_rename_table($table, $new_table);
         db_rename_table($revision_table, $revision_new_table);
         drupal_get_schema(NULL, TRUE);
+      }
       /**
        * Act on deletion of a field instance.
+       *
        * This hook is invoked from field_delete_instance() to ask the field storage
        * module to mark all information stored for the field instance for deletion.
+       *
        * @param $instance
        *   The instance being deleted.
        */
       function hook_field_storage_delete_instance($instance) {
         $field = field_info_field($instance['field_name']);
         $table_name = _field_sql_storage_tablename($field);
         $revision_name = _field_sql_storage_revision_tablename($field);
         db_update($table_name)
           ->fields(array('deleted' => 1))
           ->condition('entity_type', $instance['entity_type'])
           ->condition('bundle', $instance['bundle'])
           ->execute();
         db_update($revision_name)
           ->fields(array('deleted' => 1))
           ->condition('entity_type', $instance['entity_type'])
           ->condition('bundle', $instance['bundle'])
           ->execute();
+      }
       /**
        * Act before the storage backends load field data.
+       *
        * This hook allows modules to load data before the Field Storage API,
        * optionally preventing the field storage module from doing so.
+       *
        * This lets 3rd party modules override, mirror, shard, or otherwise store a
        * subset of fields in a different way than the current storage engine.
        * Possible use cases include per-bundle storage, per-combo-field storage, etc.
+       *
        * Modules implementing this hook should load field values and add them to
        * objects in $entities. Fields with no values should be added as empty
        * arrays. In addition, fields loaded should be added as keys to $skip_fields.
+       *
        * @param $entity_type
        *   The type of entity, such as 'node' or 'user'.
        * @param $entities
        *   The array of entity objects to add fields to, keyed by entity ID.
        * @param $age
        *   FIELD_LOAD_CURRENT to load the most recent revision for all fields, or
        *   FIELD_LOAD_REVISION to load the version indicated by each entity.
        * @param $skip_fields
        *   An array keyed by field IDs whose data has already been loaded and
        *   therefore should not be loaded again. Add a key to this array to indicate
        *   that your module has already loaded a field.
        * @param $options
        *   An associative array of additional options, with the following keys:
        *   - field_id: The field ID that should be loaded. If unset, all fields
        *     should be loaded.
        *   - deleted: If TRUE, deleted fields should be loaded as well as
        *     non-deleted fields. If unset or FALSE, only non-deleted fields should be
        *     loaded.
        */
       function hook_field_storage_pre_load($entity_type, $entities, $age, &$skip_fields, $options) {
         // @todo Needs function body.
+      }
       /**
        * Act before the storage backends insert field data.
+       *
        * This hook allows modules to store data before the Field Storage API,
        * optionally preventing the field storage module from doing so.
+       *
        * @param $entity_type
        *   The type of $entity; for example, 'node' or 'user'.
        * @param $entity
        *   The entity with fields to save.
        * @param $skip_fields
        *   An array keyed by field IDs whose data has already been written and
        *   therefore should not be written again. The values associated with these
        *   keys are not specified.
        * @return
        *   Saved field IDs are set set as keys in $skip_fields.
        */
       function hook_field_storage_pre_insert($entity_type, $entity, &$skip_fields) {
         if ($entity_type == 'node' && $entity->status && _forum_node_check_node_type($entity)) {
           $query = db_insert('forum_index')->fields(array('nid', 'title', 'tid', 'sticky', 'created', 'comment_count', 'last_comment_timestamp'));
           foreach ($entity->taxonomy_forums as $language) {
             foreach ($language as $delta) {
               $query->values(array(
                 'nid' => $entity->nid,
                 'title' => $entity->title,
                 'tid' => $delta['value'],
                 'sticky' => $entity->sticky,
                 'created' => $entity->created,
                 'comment_count' => 0,
                 'last_comment_timestamp' => $entity->created,
               ));
+            }
+          }
           $query->execute();
+        }
+      }
       /**
        * Act before the storage backends update field data.
+       *
        * This hook allows modules to store data before the Field Storage API,
        * optionally preventing the field storage module from doing so.
+       *
        * @param $entity_type
        *   The type of $entity; for example, 'node' or 'user'.
        * @param $entity
        *   The entity with fields to save.
        * @param $skip_fields
        *   An array keyed by field IDs whose data has already been written and
        *   therefore should not be written again. The values associated with these
        *   keys are not specified.
        * @return
        *   Saved field IDs are set set as keys in $skip_fields.
        */
       function hook_field_storage_pre_update($entity_type, $entity, &$skip_fields) {
         $first_call = &drupal_static(__FUNCTION__, array());
         if ($entity_type == 'node' && $entity->status && _forum_node_check_node_type($entity)) {
           // We don't maintain data for old revisions, so clear all previous values
           // from the table. Since this hook runs once per field, per entity, make
           // sure we only wipe values once.
           if (!isset($first_call[$entity->nid])) {
             $first_call[$entity->nid] = FALSE;
             db_delete('forum_index')->condition('nid', $entity->nid)->execute();
+          }
           // Only save data to the table if the node is published.
           if ($entity->status) {
             $query = db_insert('forum_index')->fields(array('nid', 'title', 'tid', 'sticky', 'created', 'comment_count', 'last_comment_timestamp'));
             foreach ($entity->taxonomy_forums as $language) {
               foreach ($language as $delta) {
                 $query->values(array(
                   'nid' => $entity->nid,
                   'title' => $entity->title,
                   'tid' => $delta['value'],
                   'sticky' => $entity->sticky,
                   'created' => $entity->created,
                   'comment_count' => 0,
                   'last_comment_timestamp' => $entity->created,
                 ));
+              }
+            }
             $query->execute();
             // The logic for determining last_comment_count is fairly complex, so
             // call _forum_update_forum_index() too.
             _forum_update_forum_index($entity->nid);
+          }
+        }
+      }
       /**
        * @} End of "addtogroup field_storage
        */
       /**
        * Returns the maximum weight for the entity components handled by the module.
+       *
        * Field API takes care of fields and 'extra_fields'. This hook is intended for
        * third-party modules adding other entity components (e.g. field_group).
+       *
        * @param $entity_type
        *   The type of entity; e.g. 'node' or 'user'.
        * @param $bundle
        *   The bundle name.
        * @param $context
        *   The context for which the maximum weight is requested. Either 'form', or
        *   the name of a view mode.
+       *
        * @return
        *   The maximum weight of the entity's components, or NULL if no components
        *   were found.
+       *
        * @ingroup field_info
        */
       function hook_field_info_max_weight($entity_type, $bundle, $context) {
         $weights = array();
         foreach (my_module_entity_additions($entity_type, $bundle, $context) as $addition) {
           $weights[] = $addition['weight'];
+        }
         return $weights ? max($weights) : NULL;
+      }
       /**
        * @addtogroup field_types
        * @{
        */
       /**
        * Alters the display settings of a field before it gets displayed.
+       *
        * Note that instead of hook_field_display_alter(), which is called for all
        * fields on all entity types, hook_field_display_ENTITY_TYPE_alter() may be
        * used to alter display settings for fields on a specific entity type only.
+       *
        * This hook is called once per field per displayed entity. If the result of the
        * hook involves reading from the database, it is highly recommended to
        * statically cache the information.
+       *
        * @param $display
        *   The display settings that will be used to display the field values, as
        *   found in the 'display' key of $instance definitions.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The entity type; e.g., 'node' or 'user'.
        *   - field: The field being rendered.
        *   - instance: The instance being rendered.
        *   - entity: The entity being rendered.
        *   - view_mode: The view mode, e.g. 'full', 'teaser'...
+       *
        * @see hook_field_display_ENTITY_TYPE_alter()
        */
       function hook_field_display_alter(&$display, $context) {
         // Leave field labels out of the search index.
         // Note: The check against $context['entity_type'] == 'node' could be avoided
         // by using hook_field_display_node_alter() instead of
         // hook_field_display_alter(), resulting in less function calls when
         // rendering non-node entities.
         if ($context['entity_type'] == 'node' && $context['view_mode'] == 'search_index') {
           $display['label'] = 'hidden';
+        }
+      }
       /**
        * Alters the display settings of a field on a given entity type before it gets displayed.
+       *
        * Modules can implement hook_field_display_ENTITY_TYPE_alter() to alter display
        * settings for fields on a specific entity type, rather than implementing
        * hook_field_display_alter().
+       *
        * This hook is called once per field per displayed entity. If the result of the
        * hook involves reading from the database, it is highly recommended to
        * statically cache the information.
+       *
        * @param $display
        *   The display settings that will be used to display the field values, as
        *   found in the 'display' key of $instance definitions.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The entity type; e.g., 'node' or 'user'.
        *   - field: The field being rendered.
        *   - instance: The instance being rendered.
        *   - entity: The entity being rendered.
        *   - view_mode: The view mode, e.g. 'full', 'teaser'...
+       *
        * @see hook_field_display_alter()
        */
       function hook_field_display_ENTITY_TYPE_alter(&$display, $context) {
         // Leave field labels out of the search index.
         if ($context['view_mode'] == 'search_index') {
           $display['label'] = 'hidden';
+        }
+      }
       /**
        * @} End of "addtogroup field_types
        */
       /**
        * Alters the display settings of pseudo-fields before an entity is displayed.
+       *
        * This hook is called once per displayed entity. If the result of the hook
        * involves reading from the database, it is highly recommended to statically
        * cache the information.
+       *
        * @param $displays
        *   An array of display settings for the pseudo-fields in the entity, keyed
        *   by pseudo-field names.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The entity type; e.g., 'node' or 'user'.
        *   - bundle: The bundle name.
        *   - view_mode: The view mode, e.g. 'full', 'teaser'...
+       *
        * @ingroup field_types
        */
       function hook_field_extra_fields_display_alter(&$displays, $context) {
         if ($context['entity_type'] == 'taxonomy_term' && $context['view_mode'] == 'full') {
           $displays['description']['visible'] = FALSE;
+        }
+      }
       /**
        * Alters the widget properties of a field instance on a given entity type
        * before it gets displayed.
+       *
        * Modules can implement hook_field_widget_properties_ENTITY_TYPE_alter() to
        * alter the widget properties for fields on a specific entity type, rather than
        * implementing hook_field_widget_properties_alter().
+       *
        * This hook is called once per field per displayed widget entity. If the result
        * of the hook involves reading from the database, it is highly recommended to
        * statically cache the information.
+       *
        * @param $widget
        *   The instance's widget properties.
        * @param $context
        *   An associative array containing:
        *   - entity_type: The entity type; e.g., 'node' or 'user'.
        *   - entity: The entity object.
        *   - field: The field that the widget belongs to.
        *   - instance: The instance of the field.
+       *
        * @see hook_field_widget_properties_alter()
+       *
        * @ingroup field_widget
        */
       function hook_field_widget_properties_ENTITY_TYPE_alter(&$widget, $context) {
         // Change a widget's type according to the time of day.
         $field = $context['field'];
         if ($field['field_name'] == 'field_foo') {
           $time = date('H');
           $widget['type'] = $time < 12 ? 'widget_am' : 'widget_pm';
+        }
+      }
       /**
        * @addtogroup field_crud
        * @{
        */
       /**
        * Act on a field being created.
+       *
        * This hook is invoked from field_create_field() after the field is created, to
        * allow modules to act on field creation.
+       *
        * @param $field
        *   The field just created.
        */
       function hook_field_create_field($field) {
         // @todo Needs function body.
+      }
       /**
        * Act on a field instance being created.
+       *
        * This hook is invoked from field_create_instance() after the instance record
        * is saved, so it cannot be used to modify the instance itself.
+       *
        * @param $instance
        *   The instance just created.
        */
       function hook_field_create_instance($instance) {
         // @todo Needs function body.
+      }
       /**
        * Forbid a field update from occurring.
+       *
        * Any module may forbid any update for any reason. For example, the
        * field's storage module might forbid an update if it would change
        * the storage schema while data for the field exists. A field type
        * module might forbid an update if it would change existing data's
        * semantics, or if there are external dependencies on field settings
        * that cannot be updated.
+       *
        * To forbid the update from occurring, throw a FieldUpdateForbiddenException.
+       *
        * @param $field
        *   The field as it will be post-update.
        * @param $prior_field
        *   The field as it is pre-update.
        * @param $has_data
        *   Whether any data already exists for this field.
        */
       function hook_field_update_forbid($field, $prior_field, $has_data) {
         // A 'list' field stores integer keys mapped to display values. If
         // the new field will have fewer values, and any data exists for the
         // abandoned keys, the field will have no way to display them. So,
         // forbid such an update.
         if ($has_data && count($field['settings']['allowed_values']) < count($prior_field['settings']['allowed_values'])) {
           // Identify the keys that will be lost.
           $lost_keys = array_diff(array_keys($field['settings']['allowed_values']), array_keys($prior_field['settings']['allowed_values']));
           // If any data exist for those keys, forbid the update.
           $query = new EntityFieldQuery();
           $found = $query
             ->fieldCondition($prior_field['field_name'], 'value', $lost_keys)
             ->range(0, 1)
             ->execute();
           if ($found) {
             throw new FieldUpdateForbiddenException("Cannot update a list field not to include keys with existing data");
+          }
+        }
+      }
       /**
        * Act on a field being updated.
+       *
        * This hook is invoked just after field is updated in field_update_field().
+       *
        * @param $field
        *   The field as it is post-update.
        * @param $prior_field
        *   The field as it was pre-update.
        * @param $has_data
        *   Whether any data already exists for this field.
        */
       function hook_field_update_field($field, $prior_field, $has_data) {
         // Reset the static value that keeps track of allowed values for list fields.
         drupal_static_reset('list_allowed_values');
+      }
       /**
        * Act on a field being deleted.
+       *
        * This hook is invoked just after a field is deleted by field_delete_field().
+       *
        * @param $field
        *   The field just deleted.
        */
       function hook_field_delete_field($field) {
         // @todo Needs function body.
+      }
       /**
        * Act on a field instance being updated.
+       *
        * This hook is invoked from field_update_instance() after the instance record
        * is saved, so it cannot be used by a module to modify the instance itself.
+       *
        * @param $instance
        *   The instance as it is post-update.
        * @param $prior_instance
        *   The instance as it was pre-update.
        */
       function hook_field_update_instance($instance, $prior_instance) {
         // @todo Needs function body.
+      }
       /**
        * Act on a field instance being deleted.
+       *
        * This hook is invoked from field_delete_instance() after the instance is
        * deleted.
+       *
        * @param $instance
        *   The instance just deleted.
        */
       function hook_field_delete_instance($instance) {
         // @todo Needs function body.
+      }
       /**
        * Act on field records being read from the database.
+       *
        * This hook is invoked from field_read_fields() on each field being read.
+       *
        * @param $field
        *   The field record just read from the database.
        */
       function hook_field_read_field($field) {
         // @todo Needs function body.
+      }
       /**
        * Act on a field record being read from the database.
+       *
        * This hook is invoked from field_read_instances() on each instance being read.
+       *
        * @param $instance
        *   The instance record just read from the database.
        */
       function hook_field_read_instance($instance) {
         // @todo Needs function body.
+      }
       /**
        * Acts when a field record is being purged.
+       *
        * In field_purge_field(), after the field configuration has been
        * removed from the database, the field storage module has had a chance to
        * run its hook_field_storage_purge_field(), and the field info cache
        * has been cleared, this hook is invoked on all modules to allow them to
        * respond to the field being purged.
+       *
        * @param $field
        *   The field being purged.
        */
       function hook_field_purge_field($field) {
         db_delete('my_module_field_info')
           ->condition('id', $field['id'])
           ->execute();
+      }
       /**
        * Acts when a field instance is being purged.
+       *
        * In field_purge_instance(), after the field instance has been
        * removed from the database, the field storage module has had a chance to
        * run its hook_field_storage_purge_instance(), and the field info cache
        * has been cleared, this hook is invoked on all modules to allow them to
        * respond to the field instance being purged.
+       *
        * @param $instance
        *   The instance being purged.
        */
       function hook_field_purge_instance($instance) {
         db_delete('my_module_field_instance_info')
           ->condition('id', $instance['id'])
           ->execute();
+      }
       /**
        * Remove field storage information when a field record is purged.
+       *
        * Called from field_purge_field() to allow the field storage module
        * to remove field information when a field is being purged.
+       *
        * @param $field
        *   The field being purged.
+       *
        * @ingroup field_storage
        */
       function hook_field_storage_purge_field($field) {
         $table_name = _field_sql_storage_tablename($field);
         $revision_name = _field_sql_storage_revision_tablename($field);
         db_drop_table($table_name);
         db_drop_table($revision_name);
+      }
       /**
        * Remove field storage information when a field instance is purged.
+       *
        * Called from field_purge_instance() to allow the field storage module
        * to remove field instance information when a field instance is being
        * purged.
+       *
        * @param $instance
        *   The instance being purged.
+       *
        * @ingroup field_storage
        */
       function hook_field_storage_purge_field_instance($instance) {
         db_delete('my_module_field_instance_info')
           ->condition('id', $instance['id'])
           ->execute();
+      }
       /**
        * Remove field storage information when field data is purged.
+       *
        * Called from field_purge_data() to allow the field storage
        * module to delete field data information.
+       *
        * @param $entity_type
        *   The type of $entity; for example, 'node' or 'user'.
        * @param $entity
        *   The pseudo-entity whose field data to delete.
        * @param $field
        *   The (possibly deleted) field whose data is being purged.
        * @param $instance
        *   The deleted field instance whose data is being purged.
+       *
        * @ingroup field_storage
        */
       function hook_field_storage_purge($entity_type, $entity, $field, $instance) {
         list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
         $table_name = _field_sql_storage_tablename($field);
         $revision_name = _field_sql_storage_revision_tablename($field);
         db_delete($table_name)
           ->condition('entity_type', $entity_type)
           ->condition('entity_id', $id)
           ->execute();
         db_delete($revision_name)
           ->condition('entity_type', $entity_type)
           ->condition('entity_id', $id)
           ->execute();
+      }
       /**
        * @} End of "addtogroup field_crud".
        */
       /**
        * Determine whether the user has access to a given field.
+       *
        * This hook is invoked from field_access() to let modules block access to
        * operations on fields. If no module returns FALSE, the operation is allowed.
+       *
        * @param $op
        *   The operation to be performed. Possible values: 'edit', 'view'.
        * @param $field
        *   The field on which the operation is to be performed.
        * @param $entity_type
        *   The type of $entity; for example, 'node' or 'user'.
        * @param $entity
        *   (optional) The entity for the operation.
        * @param $account
        *   (optional) The account to check; if not given use currently logged in user.
+       *
        * @return
        *   TRUE if the operation is allowed, and FALSE if the operation is denied.
+       *
        * @ingroup field_types
        */
       function hook_field_access($op, $field, $entity_type, $entity, $account) {
         if ($field['field_name'] == 'field_of_interest' && $op == 'edit') {
           return user_access('edit field of interest', $account);
+        }
         return TRUE;
+      }
       /**
        * @} End of "addtogroup hooks".
        */

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root / drupal7 / modules / field / field.api.php @ 2196f227