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<?php
/**
* @file
* Field Info API, providing information about available fields and field types.
*/
/**
* @defgroup field_info Field Info API
* @{
* Obtain information about Field API configuration.
*
* The Field Info API exposes information about field types, fields,
* instances, bundles, widget types, display formatters, behaviors,
* and settings defined by or with the Field API.
*
* See @link field Field API @endlink for information about the other parts of
* the Field API.
*/
/**
* Clears the field info cache without clearing the field data cache.
*
* This is useful when deleted fields or instances are purged. We
* need to remove the purged records, but no actual field data items
* are affected.
*/
function field_info_cache_clear() {
drupal_static_reset('field_view_mode_settings');
drupal_static_reset('field_available_languages');
// @todo: Remove this when field_attach_*_bundle() bundle management
// functions are moved to the entity API.
entity_info_cache_clear();
_field_info_collate_types(TRUE);
_field_info_collate_fields(TRUE);
}
/**
* Collates all information on field types, widget types and related structures.
*
* @param $reset
* If TRUE, clear the cache. The information will be rebuilt from the database
* next time it is needed. Defaults to FALSE.
*
* @return
* If $reset is TRUE, nothing.
* If $reset is FALSE, an array containing the following elements:
* - 'field types': Array of hook_field_info() results, keyed by field_type.
* Each element has the following components: label, description, settings,
* instance_settings, default_widget, default_formatter, and behaviors
* from hook_field_info(), as well as module, giving the module that exposes
* the field type.
* - 'widget types': Array of hook_field_widget_info() results, keyed by
* widget_type. Each element has the following components: label, field
* types, settings, and behaviors from hook_field_widget_info(), as well
* as module, giving the module that exposes the widget type.
* - 'formatter types': Array of hook_field_formatter_info() results, keyed by
* formatter_type. Each element has the following components: label, field
* types, and behaviors from hook_field_formatter_info(), as well as
* module, giving the module that exposes the formatter type.
* - 'storage types': Array of hook_field_storage_info() results, keyed by
* storage type names. Each element has the following components: label,
* description, and settings from hook_field_storage_info(), as well as
* module, giving the module that exposes the storage type.
* - 'fieldable types': Array of hook_entity_info() results, keyed by
* entity_type. Each element has the following components: name, id key,
* revision key, bundle key, cacheable, and bundles from hook_entity_info(),
* as well as module, giving the module that exposes the entity type.
*/
function _field_info_collate_types($reset = FALSE) {
global $language;
static $info;
// The _info() hooks invoked below include translated strings, so each
// language is cached separately.
$langcode = $language->language;
if ($reset) {
$info = NULL;
// Clear all languages.
cache_clear_all('field_info_types:', 'cache_field', TRUE);
return;
}
if (!isset($info)) {
if ($cached = cache_get("field_info_types:$langcode", 'cache_field')) {
$info = $cached->data;
}
else {
$info = array(
'field types' => array(),
'widget types' => array(),
'formatter types' => array(),
'storage types' => array(),
);
// Populate field types.
foreach (module_implements('field_info') as $module) {
$field_types = (array) module_invoke($module, 'field_info');
foreach ($field_types as $name => $field_info) {
// Provide defaults.
$field_info += array(
'settings' => array(),
'instance_settings' => array(),
);
$info['field types'][$name] = $field_info;
$info['field types'][$name]['module'] = $module;
}
}
drupal_alter('field_info', $info['field types']);
// Populate widget types.
foreach (module_implements('field_widget_info') as $module) {
$widget_types = (array) module_invoke($module, 'field_widget_info');
foreach ($widget_types as $name => $widget_info) {
// Provide defaults.
$widget_info += array(
'settings' => array(),
);
$info['widget types'][$name] = $widget_info;
$info['widget types'][$name]['module'] = $module;
}
}
drupal_alter('field_widget_info', $info['widget types']);
// Populate formatter types.
foreach (module_implements('field_formatter_info') as $module) {
$formatter_types = (array) module_invoke($module, 'field_formatter_info');
foreach ($formatter_types as $name => $formatter_info) {
// Provide defaults.
$formatter_info += array(
'settings' => array(),
);
$info['formatter types'][$name] = $formatter_info;
$info['formatter types'][$name]['module'] = $module;
}
}
drupal_alter('field_formatter_info', $info['formatter types']);
// Populate storage types.
foreach (module_implements('field_storage_info') as $module) {
$storage_types = (array) module_invoke($module, 'field_storage_info');
foreach ($storage_types as $name => $storage_info) {
// Provide defaults.
$storage_info += array(
'settings' => array(),
);
$info['storage types'][$name] = $storage_info;
$info['storage types'][$name]['module'] = $module;
}
}
drupal_alter('field_storage_info', $info['storage types']);
cache_set("field_info_types:$langcode", $info, 'cache_field');
}
}
return $info;
}
/**
* Collates all information on existing fields and instances.
*
* @param $reset
* If TRUE, clear the cache. The information will be rebuilt from the
* database next time it is needed. Defaults to FALSE.
*
* @return
* If $reset is TRUE, nothing.
* If $reset is FALSE, an array containing the following elements:
* - fields: Array of existing fields, keyed by field ID. This element
* lists deleted and non-deleted fields, but not inactive ones.
* Each field has an additional element, 'bundles', which is an array
* of all non-deleted instances of that field.
* - field_ids: Array of field IDs, keyed by field name. This element
* only lists non-deleted, active fields.
* - instances: Array of existing instances, keyed by entity type, bundle
* name and field name. This element only lists non-deleted instances
* whose field is active.
*/
function _field_info_collate_fields($reset = FALSE) {
static $info;
if ($reset) {
$info = NULL;
cache_clear_all('field_info_fields', 'cache_field');
return;
}
if (!isset($info)) {
if ($cached = cache_get('field_info_fields', 'cache_field')) {
$info = $cached->data;
}
else {
$definitions = array(
'field_ids' => field_read_fields(array(), array('include_deleted' => 1)),
'instances' => field_read_instances(),
);
// Populate 'fields' with all fields, keyed by ID.
$info['fields'] = array();
foreach ($definitions['field_ids'] as $key => $field) {
$info['fields'][$key] = $definitions['field_ids'][$key] = _field_info_prepare_field($field);
}
// Build an array of field IDs for non-deleted fields, keyed by name.
$info['field_ids'] = array();
foreach ($info['fields'] as $key => $field) {
if (!$field['deleted']) {
$info['field_ids'][$field['field_name']] = $key;
}
}
// Populate 'instances'. Only non-deleted instances are considered.
$info['instances'] = array();
foreach (field_info_bundles() as $entity_type => $bundles) {
foreach ($bundles as $bundle => $bundle_info) {
$info['instances'][$entity_type][$bundle] = array();
}
}
foreach ($definitions['instances'] as $instance) {
$field = $info['fields'][$instance['field_id']];
$instance = _field_info_prepare_instance($instance, $field);
$info['instances'][$instance['entity_type']][$instance['bundle']][$instance['field_name']] = $instance;
// Enrich field definitions with the list of bundles where they have
// instances. NOTE: Deleted fields in $info['field_ids'] are not
// enriched because all of their instances are deleted, too, and
// are thus not in $definitions['instances'].
$info['fields'][$instance['field_id']]['bundles'][$instance['entity_type']][] = $instance['bundle'];
}
// Populate 'extra_fields'.
$extra = module_invoke_all('field_extra_fields');
drupal_alter('field_extra_fields', $extra);
// Merge in saved settings.
foreach ($extra as $entity_type => $bundles) {
foreach ($bundles as $bundle => $extra_fields) {
$extra_fields = _field_info_prepare_extra_fields($extra_fields, $entity_type, $bundle);
$info['extra_fields'][$entity_type][$bundle] = $extra_fields;
}
}
cache_set('field_info_fields', $info, 'cache_field');
}
}
return $info;
}
/**
* Prepares a field definition for the current run-time context.
*
* Since the field was last saved or updated, new field settings can be
* expected.
*
* @param $field
* The raw field structure as read from the database.
*/
function _field_info_prepare_field($field) {
// Make sure all expected field settings are present.
$field['settings'] += field_info_field_settings($field['type']);
$field['storage']['settings'] += field_info_storage_settings($field['storage']['type']);
// Add storage details.
$details = (array) module_invoke($field['storage']['module'], 'field_storage_details', $field);
drupal_alter('field_storage_details', $details, $field, $instance);
$field['storage']['details'] = $details;
// Initialize the 'bundles' list.
$field['bundles'] = array();
return $field;
}
/**
* Prepares an instance definition for the current run-time context.
*
* Since the instance was last saved or updated, a number of things might have
* changed: widgets or formatters disabled, new settings expected, new view
* modes added...
*
* @param $instance
* The raw instance structure as read from the database.
* @param $field
* The field structure for the instance.
*
* @return
* Field instance array.
*/
function _field_info_prepare_instance($instance, $field) {
// Make sure all expected instance settings are present.
$instance['settings'] += field_info_instance_settings($field['type']);
// Set a default value for the instance.
if (field_behaviors_widget('default value', $instance) == FIELD_BEHAVIOR_DEFAULT && !isset($instance['default_value'])) {
$instance['default_value'] = NULL;
}
$instance['widget'] = _field_info_prepare_instance_widget($field, $instance['widget']);
foreach ($instance['display'] as $view_mode => $display) {
$instance['display'][$view_mode] = _field_info_prepare_instance_display($field, $display);
}
// Fallback to 'hidden' for view modes configured to use custom display
// settings, and for which the instance has no explicit settings.
$entity_info = entity_get_info($instance['entity_type']);
$view_modes = array_merge(array('default'), array_keys($entity_info['view modes']));
$view_mode_settings = field_view_mode_settings($instance['entity_type'], $instance['bundle']);
foreach ($view_modes as $view_mode) {
if ($view_mode == 'default' || !empty($view_mode_settings[$view_mode]['custom_settings'])) {
if (!isset($instance['display'][$view_mode])) {
$instance['display'][$view_mode] = array(
'type' => 'hidden',
'label' => 'above',
'settings' => array(),
'weight' => 0,
);
}
}
}
return $instance;
}
/**
* Adapts display specifications to the current run-time context.
*
* @param $field
* The field structure for the instance.
* @param $display
* Display specifications as found in
* $instance['display']['some_view_mode'].
*/
function _field_info_prepare_instance_display($field, $display) {
$field_type = field_info_field_types($field['type']);
// Fill in default values.
$display += array(
'label' => 'above',
'type' => $field_type['default_formatter'],
'settings' => array(),
'weight' => 0,
);
if ($display['type'] != 'hidden') {
$formatter_type = field_info_formatter_types($display['type']);
// Fallback to default formatter if formatter type is not available.
if (!$formatter_type) {
$display['type'] = $field_type['default_formatter'];
$formatter_type = field_info_formatter_types($display['type']);
}
$display['module'] = $formatter_type['module'];
// Fill in default settings for the formatter.
$display['settings'] += field_info_formatter_settings($display['type']);
}
return $display;
}
/**
* Prepares widget specifications for the current run-time context.
*
* @param $field
* The field structure for the instance.
* @param $widget
* Widget specifications as found in $instance['widget'].
*/
function _field_info_prepare_instance_widget($field, $widget) {
$field_type = field_info_field_types($field['type']);
// Fill in default values.
$widget += array(
'type' => $field_type['default_widget'],
'settings' => array(),
'weight' => 0,
);
$widget_type = field_info_widget_types($widget['type']);
// Fallback to default formatter if formatter type is not available.
if (!$widget_type) {
$widget['type'] = $field_type['default_widget'];
$widget_type = field_info_widget_types($widget['type']);
}
$widget['module'] = $widget_type['module'];
// Fill in default settings for the widget.
$widget['settings'] += field_info_widget_settings($widget['type']);
return $widget;
}
/**
* Prepares 'extra fields' for the current run-time context.
*
* @param $extra_fields
* The array of extra fields, as collected in hook_field_extra_fields().
* @param $entity_type
* The entity type.
* @param $bundle
* The bundle name.
*/
function _field_info_prepare_extra_fields($extra_fields, $entity_type, $bundle) {
$entity_type_info = entity_get_info($entity_type);
$bundle_settings = field_bundle_settings($entity_type, $bundle);
$extra_fields += array('form' => array(), 'display' => array());
$result = array();
// Extra fields in forms.
foreach ($extra_fields['form'] as $name => $field_data) {
$settings = isset($bundle_settings['extra_fields']['form'][$name]) ? $bundle_settings['extra_fields']['form'][$name] : array();
if (isset($settings['weight'])) {
$field_data['weight'] = $settings['weight'];
}
$result['form'][$name] = $field_data;
}
// Extra fields in displayed entities.
$data = $extra_fields['display'];
foreach ($extra_fields['display'] as $name => $field_data) {
$settings = isset($bundle_settings['extra_fields']['display'][$name]) ? $bundle_settings['extra_fields']['display'][$name] : array();
$view_modes = array_merge(array('default'), array_keys($entity_type_info['view modes']));
foreach ($view_modes as $view_mode) {
if (isset($settings[$view_mode])) {
$field_data['display'][$view_mode] = $settings[$view_mode];
}
else {
$field_data['display'][$view_mode] = array(
'weight' => $field_data['weight'],
'visible' => TRUE,
);
}
}
unset($field_data['weight']);
$result['display'][$name] = $field_data;
}
return $result;
}
/**
* Determines the behavior of a widget with respect to an operation.
*
* @param $op
* The name of the operation. Currently supported: 'default value',
* 'multiple values'.
* @param $instance
* The field instance array.
*
* @return
* One of these values:
* - FIELD_BEHAVIOR_NONE: Do nothing for this operation.
* - FIELD_BEHAVIOR_CUSTOM: Use the widget's callback function.
* - FIELD_BEHAVIOR_DEFAULT: Use field.module default behavior.
*/
function field_behaviors_widget($op, $instance) {
$info = field_info_widget_types($instance['widget']['type']);
return isset($info['behaviors'][$op]) ? $info['behaviors'][$op] : FIELD_BEHAVIOR_DEFAULT;
}
/**
* Returns information about field types from hook_field_info().
*
* @param $field_type
* (optional) A field type name. If omitted, all field types will be
* returned.
*
* @return
* Either a field type description, as provided by hook_field_info(), or an
* array of all existing field types, keyed by field type name.
*/
function field_info_field_types($field_type = NULL) {
$info = _field_info_collate_types();
$field_types = $info['field types'];
if ($field_type) {
if (isset($field_types[$field_type])) {
return $field_types[$field_type];
}
}
else {
return $field_types;
}
}
/**
* Returns information about field widgets from hook_field_widget_info().
*
* @param $widget_type
* (optional) A widget type name. If omitted, all widget types will be
* returned.
*
* @return
* Either a single widget type description, as provided by
* hook_field_widget_info(), or an array of all existing widget types, keyed
* by widget type name.
*/
function field_info_widget_types($widget_type = NULL) {
$info = _field_info_collate_types();
$widget_types = $info['widget types'];
if ($widget_type) {
if (isset($widget_types[$widget_type])) {
return $widget_types[$widget_type];
}
}
else {
return $widget_types;
}
}
/**
* Returns information about field formatters from hook_field_formatter_info().
*
* @param $formatter_type
* (optional) A formatter type name. If omitted, all formatter types will be
* returned.
*
* @return
* Either a single formatter type description, as provided by
* hook_field_formatter_info(), or an array of all existing formatter types,
* keyed by formatter type name.
*/
function field_info_formatter_types($formatter_type = NULL) {
$info = _field_info_collate_types();
$formatter_types = $info['formatter types'];
if ($formatter_type) {
if (isset($formatter_types[$formatter_type])) {
return $formatter_types[$formatter_type];
}
}
else {
return $formatter_types;
}
}
/**
* Returns information about field storage from hook_field_storage_info().
*
* @param $storage_type
* (optional) A storage type name. If omitted, all storage types will be
* returned.
*
* @return
* Either a storage type description, as provided by
* hook_field_storage_info(), or an array of all existing storage types,
* keyed by storage type name.
*/
function field_info_storage_types($storage_type = NULL) {
$info = _field_info_collate_types();
$storage_types = $info['storage types'];
if ($storage_type) {
if (isset($storage_types[$storage_type])) {
return $storage_types[$storage_type];
}
}
else {
return $storage_types;
}
}
/**
* Returns information about existing bundles.
*
* @param $entity_type
* The type of entity; e.g. 'node' or 'user'.
*
* @return
* An array of bundles for the $entity_type keyed by bundle name,
* or, if no $entity_type was provided, the array of all existing bundles,
* keyed by entity type.
*/
function field_info_bundles($entity_type = NULL) {
$info = entity_get_info();
if ($entity_type) {
return isset($info[$entity_type]['bundles']) ? $info[$entity_type]['bundles'] : array();
}
$bundles = array();
foreach ($info as $type => $entity_info) {
$bundles[$type] = $entity_info['bundles'];
}
return $bundles;
}
/**
* Returns all field definitions.
*
* @return
* An array of field definitions, keyed by field name. Each field has an
* additional property, 'bundles', which is an array of all the bundles to
* which this field belongs keyed by entity type.
*/
function field_info_fields() {
$fields = array();
$info = _field_info_collate_fields();
foreach ($info['fields'] as $key => $field) {
if (!$field['deleted']) {
$fields[$field['field_name']] = $field;
}
}
return $fields;
}
/**
* Returns data about an individual field, given a field name.
*
* @param $field_name
* The name of the field to retrieve. $field_name can only refer to a
* non-deleted, active field. For deleted fields, use
* field_info_field_by_id(). To retrieve information about inactive fields,
* use field_read_fields().
*
* @return
* The field array, as returned by field_read_fields(), with an
* additional element 'bundles', whose value is an array of all the bundles
* this field belongs to keyed by entity type. NULL if the field was not
* found.
*
* @see field_info_field_by_id()
*/
function field_info_field($field_name) {
$info = _field_info_collate_fields();
if (isset($info['field_ids'][$field_name])) {
return $info['fields'][$info['field_ids'][$field_name]];
}
}
/**
* Returns data about an individual field, given a field ID.
*
* @param $field_id
* The id of the field to retrieve. $field_id can refer to a
* deleted field, but not an inactive one.
*
* @return
* The field array, as returned by field_read_fields(), with an
* additional element 'bundles', whose value is an array of all the bundles
* this field belongs to.
*
* @see field_info_field()
*/
function field_info_field_by_id($field_id) {
$info = _field_info_collate_fields();
if (isset($info['fields'][$field_id])) {
return $info['fields'][$field_id];
}
}
/**
* Returns the same data as field_info_field_by_id() for every field.
*
* This function is typically used when handling all fields of some entities
* to avoid thousands of calls to field_info_field_by_id().
*
* @return
* An array, each key is a field ID and the values are field arrays as
* returned by field_read_fields(), with an additional element 'bundles',
* whose value is an array of all the bundle this field belongs to.
*
* @see field_info_field()
* @see field_info_field_by_id()
*/
function field_info_field_by_ids() {
$info = _field_info_collate_fields();
return $info['fields'];
}
/**
* Retrieves information about field instances.
*
* @param $entity_type
* The entity type for which to return instances.
* @param $bundle_name
* The bundle name for which to return instances.
*
* @return
* If $entity_type is not set, return all instances keyed by entity type and
* bundle name. If $entity_type is set, return all instances for that entity
* type, keyed by bundle name. If $entity_type and $bundle_name are set, return
* all instances for that bundle.
*/
function field_info_instances($entity_type = NULL, $bundle_name = NULL) {
$info = _field_info_collate_fields();
if (isset($entity_type) && isset($bundle_name)) {
return isset($info['instances'][$entity_type][$bundle_name]) ? $info['instances'][$entity_type][$bundle_name] : array();
}
elseif (isset($entity_type)) {
return isset($info['instances'][$entity_type]) ? $info['instances'][$entity_type] : array();
}
else {
return $info['instances'];
}
}
/**
* Returns an array of instance data for a specific field and bundle.
*
* @param $entity_type
* The entity type for the instance.
* @param $field_name
* The field name for the instance.
* @param $bundle_name
* The bundle name for the instance.
*/
function field_info_instance($entity_type, $field_name, $bundle_name) {
$info = _field_info_collate_fields();
if (isset($info['instances'][$entity_type][$bundle_name][$field_name])) {
return $info['instances'][$entity_type][$bundle_name][$field_name];
}
}
/**
* Returns a list and settings of pseudo-field elements in a given bundle.
*
* If $context is 'form', an array with the following structure:
* @code
* array(
* 'name_of_pseudo_field_component' => array(
* 'label' => The human readable name of the component,
* 'description' => A short description of the component content,
* 'weight' => The weight of the component in edit forms,
* ),
* 'name_of_other_pseudo_field_component' => array(
* // ...
* ),
* );
* @endcode
*
* If $context is 'display', an array with the following structure:
* @code
* array(
* 'name_of_pseudo_field_component' => array(
* 'label' => The human readable name of the component,
* 'description' => A short description of the component content,
* // One entry per view mode, including the 'default' mode:
* 'display' => array(
* 'default' => array(
* 'weight' => The weight of the component in displayed entities in
* this view mode,
* 'visible' => TRUE if the component is visible, FALSE if hidden, in
* displayed entities in this view mode,
* ),
* 'teaser' => array(
* // ...
* ),
* ),
* ),
* 'name_of_other_pseudo_field_component' => array(
* // ...
* ),
* );
* @endcode
*
* @param $entity_type
* The type of entity; e.g. 'node' or 'user'.
* @param $bundle
* The bundle name.
* @param $context
* The context for which the list of pseudo-fields is requested. Either
* 'form' or 'display'.
*
* @return
* The array of pseudo-field elements in the bundle.
*/
function field_info_extra_fields($entity_type, $bundle, $context) {
$info = _field_info_collate_fields();
if (isset($info['extra_fields'][$entity_type][$bundle][$context])) {
return $info['extra_fields'][$entity_type][$bundle][$context];
}
return array();
}
/**
* Returns the maximum weight of all the components in an entity.
*
* This includes fields, 'extra_fields', and other components added by
* third-party modules (e.g. field_group).
*
* @param $entity_type
* The type of entity; e.g. 'node' or 'user'.
* @param $bundle
* The bundle name.
* @param $context
* The context for which the maximum weight is requested. Either 'form', or
* the name of a view mode.
* @return
* The maximum weight of the entity's components, or NULL if no components
* were found.
*/
function field_info_max_weight($entity_type, $bundle, $context) {
$weights = array();
// Collect weights for fields.
foreach (field_info_instances($entity_type, $bundle) as $instance) {
if ($context == 'form') {
$weights[] = $instance['widget']['weight'];
}
elseif (isset($instance['display'][$context]['weight'])) {
$weights[] = $instance['display'][$context]['weight'];
}
}
// Collect weights for extra fields.
foreach (field_info_extra_fields($entity_type, $bundle, $context) as $extra) {
$weights[] = $extra['weight'];
}
// Let other modules feedback about their own additions.
$weights = array_merge($weights, module_invoke_all('field_info_max_weight', $entity_type, $bundle, $context));
$max_weight = $weights ? max($weights) : NULL;
return $max_weight;
}
/**
* Returns a field type's default settings.
*
* @param $type
* A field type name.
*
* @return
* The field type's default settings, as provided by hook_field_info(), or an
* empty array if type or settings are not defined.
*/
function field_info_field_settings($type) {
$info = field_info_field_types($type);
return isset($info['settings']) ? $info['settings'] : array();
}
/**
* Returns a field type's default instance settings.
*
* @param $type
* A field type name.
*
* @return
* The field type's default instance settings, as provided by
* hook_field_info(), or an empty array if type or settings are not defined.
*/
function field_info_instance_settings($type) {
$info = field_info_field_types($type);
return isset($info['instance_settings']) ? $info['instance_settings'] : array();
}
/**
* Returns a field widget's default settings.
*
* @param $type
* A widget type name.
*
* @return
* The widget type's default settings, as provided by
* hook_field_widget_info(), or an empty array if type or settings are
* undefined.
*/
function field_info_widget_settings($type) {
$info = field_info_widget_types($type);
return isset($info['settings']) ? $info['settings'] : array();
}
/**
* Returns a field formatter's default settings.
*
* @param $type
* A field formatter type name.
*
* @return
* The formatter type's default settings, as provided by
* hook_field_formatter_info(), or an empty array if type or settings are
* undefined.
*/
function field_info_formatter_settings($type) {
$info = field_info_formatter_types($type);
return isset($info['settings']) ? $info['settings'] : array();
}
/**
* Returns a field storage type's default settings.
*
* @param $type
* A field storage type name.
*
* @return
* The storage type's default settings, as provided by
* hook_field_storage_info(), or an empty array if type or settings are
* undefined.
*/
function field_info_storage_settings($type) {
$info = field_info_storage_types($type);
return isset($info['settings']) ? $info['settings'] : array();
}
/**
* @} End of "defgroup field_info".
*/
