<?php

/**

 * @file

 * Defines a field type and its formatters and widgets.

 */

/**

 * Implements hook_field_info().

 */

function field_test_field_info() {

  return array(

    'test_field' => array(

      'label' => t('Test field'),

      'description' => t('Dummy field type used for tests.'),

      'settings' => array(

        'test_field_setting' => 'dummy test string',

        'changeable' => 'a changeable field setting',

        'unchangeable' => 'an unchangeable field setting',

      ),

      'instance_settings' => array(

        'test_instance_setting' => 'dummy test string',

        'test_hook_field_load' => FALSE,

      ),

      'default_widget' => 'test_field_widget',

      'default_formatter' => 'field_test_default',

    ),

    'shape' => array(

      'label' => t('Shape'),

      'description' => t('Another dummy field type.'),

      'settings' => array(

        'foreign_key_name' => 'shape',

      ),

      'instance_settings' => array(),

      'default_widget' => 'test_field_widget',

      'default_formatter' => 'field_test_default',

    ),

    'hidden_test_field' => array(

      'no_ui' => TRUE,

      'label' => t('Hidden from UI test field'),

      'description' => t('Dummy hidden field type used for tests.'),

      'settings' => array(),

      'instance_settings' => array(),

      'default_widget' => 'test_field_widget',

      'default_formatter' => 'field_test_default',

    ),

  );

}

/**

 * Implements hook_field_update_forbid().

 */

function field_test_field_update_forbid($field, $prior_field, $has_data) {

  if ($field['type'] == 'test_field' && $field['settings']['unchangeable'] != $prior_field['settings']['unchangeable']) {

    throw new FieldException("field_test 'unchangeable' setting cannot be changed'");

  }

}

/**

 * Implements hook_field_load().

 */

function field_test_field_load($entity_type, $entities, $field, $instances, $langcode, &$items, $age) {

  $args = func_get_args();

  field_test_memorize(__FUNCTION__, $args);

  foreach ($items as $id => $item) {

    // To keep the test non-intrusive, only act for instances with the

    // test_hook_field_load setting explicitly set to TRUE.

    if ($instances[$id]['settings']['test_hook_field_load']) {

      foreach ($item as $delta => $value) {

        // Don't add anything on empty values.

        if ($value) {

          $items[$id][$delta]['additional_key'] = 'additional_value';

        }

      }

    }

  }

}

/**

 * Implements hook_field_insert().

 */

function field_test_field_insert($entity_type, $entity, $field, $instance, $items) {

  $args = func_get_args();

  field_test_memorize(__FUNCTION__, $args);

}

/**

 * Implements hook_field_update().

 */

function field_test_field_update($entity_type, $entity, $field, $instance, $items) {

  $args = func_get_args();

  field_test_memorize(__FUNCTION__, $args);

}

/**

 * Implements hook_field_delete().

 */

function field_test_field_delete($entity_type, $entity, $field, $instance, $items) {

  $args = func_get_args();

  field_test_memorize(__FUNCTION__, $args);

}

/**

 * Implements hook_field_validate().

 *

 * Possible error codes:

 * - 'field_test_invalid': The value is invalid.

 */

function field_test_field_validate($entity_type, $entity, $field, $instance, $langcode, $items, &$errors) {

  $args = func_get_args();

  field_test_memorize(__FUNCTION__, $args);

  foreach ($items as $delta => $item) {

    if ($item['value'] == -1) {

      $errors[$field['field_name']][$langcode][$delta][] = array(

        'error' => 'field_test_invalid',

        'message' => t('%name does not accept the value -1.', array('%name' => $instance['label'])),

      );

    }

  }

}

/**

 * Implements hook_field_is_empty().

 */

function field_test_field_is_empty($item, $field) {

  return empty($item['value']);

}

/**

 * Implements hook_field_settings_form().

 */

function field_test_field_settings_form($field, $instance, $has_data) {

  $settings = $field['settings'];

  $form['test_field_setting'] = array(

    '#type' => 'textfield',

    '#title' => t('Field test field setting'),

    '#default_value' => $settings['test_field_setting'],

    '#required' => FALSE,

    '#description' => t('A dummy form element to simulate field setting.'),

  );

  return $form;

}

/**

 * Implements hook_field_instance_settings_form().

 */

function field_test_field_instance_settings_form($field, $instance) {

  $settings = $instance['settings'];

  $form['test_instance_setting'] = array(

    '#type' => 'textfield',

    '#title' => t('Field test field instance setting'),

    '#default_value' => $settings['test_instance_setting'],

    '#required' => FALSE,

    '#description' => t('A dummy form element to simulate field instance setting.'),

  );

  return $form;

}

/**

 * Implements hook_field_widget_info().

 */

function field_test_field_widget_info() {

  return array(

    'test_field_widget' => array(

      'label' => t('Test field'),

      'field types' => array('test_field', 'hidden_test_field'),

      'settings' => array('test_widget_setting' => 'dummy test string'),

    ),

    'test_field_widget_multiple' => array(

      'label' => t('Test field 1'),

      'field types' => array('test_field'),

      'settings' => array('test_widget_setting_multiple' => 'dummy test string'),

      'behaviors' => array(

        'multiple values' => FIELD_BEHAVIOR_CUSTOM,

      ),

    ),

  );

}

/**

 * Implements hook_field_widget_form().

 */

function field_test_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {

  switch ($instance['widget']['type']) {

    case 'test_field_widget':

      $element += array(

        '#type' => 'textfield',

        '#default_value' => isset($items[$delta]['value']) ? $items[$delta]['value'] : '',

      );

      return array('value' => $element);

    case 'test_field_widget_multiple':

      $values = array();

      foreach ($items as $delta => $value) {

        $values[] = $value['value'];

      }

      $element += array(

        '#type' => 'textfield',

        '#default_value' => implode(', ', $values),

        '#element_validate' => array('field_test_widget_multiple_validate'),

      );

      return $element;

  }

}

/**

 * Form element validation handler for 'test_field_widget_multiple' widget.

 */

function field_test_widget_multiple_validate($element, &$form_state) {

  $values = array_map('trim', explode(',', $element['#value']));

  $items = array();

  foreach ($values as $value) {

    $items[] = array('value' => $value);

  }

  form_set_value($element, $items, $form_state);

}

/**

 * Implements hook_field_widget_error().

 */

function field_test_field_widget_error($element, $error, $form, &$form_state) {

  // @todo No easy way to differenciate widget types, we should receive it as a

  // parameter.

  if (isset($element['value'])) {

    // Widget is test_field_widget.

    $error_element = $element['value'];

  }

  else {

    // Widget is test_field_widget_multiple.

    $error_element = $element;

  }

  form_error($error_element, $error['message']);

}

/**

 * Implements hook_field_widget_settings_form().

 */

function field_test_field_widget_settings_form($field, $instance) {

  $widget = $instance['widget'];

  $settings = $widget['settings'];

  $form['test_widget_setting'] = array(

    '#type' => 'textfield',

    '#title' => t('Field test field widget setting'),

    '#default_value' => $settings['test_widget_setting'],

    '#required' => FALSE,

    '#description' => t('A dummy form element to simulate field widget setting.'),

  );

  return $form;

}

/**

 * Implements hook_field_formatter_info().

 */

function field_test_field_formatter_info() {

  return array(

    'field_test_default' => array(

      'label' => t('Default'),

      'description' => t('Default formatter'),

      'field types' => array('test_field'),

      'settings' => array(

        'test_formatter_setting' => 'dummy test string',

      ),

    ),

    'field_test_multiple' => array(

      'label' => t('Multiple'),

      'description' => t('Multiple formatter'),

      'field types' => array('test_field'),

      'settings' => array(

        'test_formatter_setting_multiple' => 'dummy test string',

      ),

    ),

    'field_test_with_prepare_view' => array(

      'label' => t('Tests hook_field_formatter_prepare_view()'),

      'field types' => array('test_field'),

      'settings' => array(

        'test_formatter_setting_additional' => 'dummy test string',

      ),

    ),

  );

}

/**

 * Implements hook_field_formatter_settings_form().

 */

function field_test_field_formatter_settings_form($field, $instance, $view_mode, $form, &$form_state) {

  $display = $instance['display'][$view_mode];

  $settings = $display['settings'];

  $element = array();

  // The name of the setting depends on the formatter type.

  $map = array(

    'field_test_default' => 'test_formatter_setting',

    'field_test_multiple' => 'test_formatter_setting_multiple',

    'field_test_with_prepare_view' => 'test_formatter_setting_additional',

  );

  if (isset($map[$display['type']])) {

    $name = $map[$display['type']];

    $element[$name] = array(

      '#title' => t('Setting'),

      '#type' => 'textfield',

      '#size' => 20,

      '#default_value' => $settings[$name],

      '#required' => TRUE,

    );

  }

  return $element;

}

/**

 * Implements hook_field_formatter_settings_summary().

 */

function field_test_field_formatter_settings_summary($field, $instance, $view_mode) {

  $display = $instance['display'][$view_mode];

  $settings = $display['settings'];

  $summary = '';

  // The name of the setting depends on the formatter type.

  $map = array(

    'field_test_default' => 'test_formatter_setting',

    'field_test_multiple' => 'test_formatter_setting_multiple',

    'field_test_with_prepare_view' => 'test_formatter_setting_additional',

  );

  if (isset($map[$display['type']])) {

    $name = $map[$display['type']];

    $summary = t('@setting: @value', array('@setting' => $name, '@value' => $settings[$name]));

  }

  return $summary;

}

/**

 * Implements hook_field_formatter_prepare_view().

 */

function field_test_field_formatter_prepare_view($entity_type, $entities, $field, $instances, $langcode, &$items, $displays) {

  foreach ($items as $id => $item) {

    // To keep the test non-intrusive, only act on the

    // 'field_test_with_prepare_view' formatter.

    if ($displays[$id]['type'] == 'field_test_with_prepare_view') {

      foreach ($item as $delta => $value) {

        // Don't add anything on empty values.

        if ($value) {

          $items[$id][$delta]['additional_formatter_value'] = $value['value'] + 1;

        }

      }

    }

  }

}

/**

 * Implements hook_field_formatter_view().

 */

function field_test_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {

  $element = array();

  $settings = $display['settings'];

  switch ($display['type']) {

    case 'field_test_default':

      foreach ($items as $delta => $item) {

        $element[$delta] = array('#markup' => $settings['test_formatter_setting'] . '|' . $item['value']);

      }

      break;

    case 'field_test_with_prepare_view':

      foreach ($items as $delta => $item) {

        $element[$delta] = array('#markup' => $settings['test_formatter_setting_additional'] . '|' . $item['value'] . '|' . $item['additional_formatter_value']);

      }

      break;

    case 'field_test_multiple':

      if (!empty($items)) {

        $array = array();

        foreach ($items as $delta => $item) {

          $array[] = $delta . ':' . $item['value'];

        }

        $element[0] = array('#markup' => $settings['test_formatter_setting_multiple'] . '|' . implode('|', $array));

      }

      break;

  }

  return $element;

}

/**

 * Sample 'default value' callback.

 */

function field_test_default_value($entity_type, $entity, $field, $instance) {

  return array(array('value' => 99));

}

/**

 * Implements hook_field_access().

 */

function field_test_field_access($op, $field, $entity_type, $entity, $account) {

  if ($field['field_name'] == "field_no_{$op}_access") {

    return FALSE;

  }

  return TRUE;

}