drupal_routes/sites/all/modules/contrib/ds/tests/ds_test.module

<?php

/**
 * @file
 * Display Suite test module.
 */

/**
 * Implements hook_install().
 */
function ds_test_install() {
  variable_set('ds_extras_region_to_block', TRUE);
  variable_set('ds_extras_switch_view_mode', TRUE);
  variable_set('ds_extras_hide_page_title', TRUE);
  variable_set('ds_extras_field_template', TRUE);
  variable_set('ds_extras_fields_extra', TRUE);
  variable_set('ds_extras_hide_page_sidebars', TRUE);
  variable_set('ds_extras_fields_extra_list', "node|article|ds_extras_extra_test_field\nnode|article|ds_extras_second_field");
  variable_set('ds_extras_vd', TRUE);

  db_update('system')
    ->fields(array('weight' => 2))
    ->condition('name', 'ds_test')
    ->execute();
}

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

  // Inject ds_entity_variables in all entity theming functions.
  $entity_info = entity_get_info();
  foreach ($entity_info as $entity => $info) {
    if (isset($entity_info[$entity]['fieldable']) && $entity_info[$entity]['fieldable']) {

      // User uses user_profile for theming.
      if ($entity == 'user') $entity = 'user_profile';

      // Only add preprocess functions if entity exposes theme function.
      if (isset($theme_registry[$entity])) {
        $theme_registry[$entity]['preprocess functions'][] = 'ds_test_entity_variables';
      }
    }
  }

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

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

/**
 * Theming function, added after ds_entity_variables().
 *
 * @param $variables
 */
function ds_test_entity_variables(&$variables) {
  if (isset($_GET['store'])) {
    cache_set('ds_test', $variables);
  }
}

/**
 * Implements hook_views_api().
 */
function ds_test_views_api($module, $api) {
  if ($module == 'views' && $api == 'views_default') {
    return array('version' => 3);
  }
}

/**
 * Helper function to return the tag name basid on tid.
 */
function ds_test_get_tag_name($raw_value, $object) {
  $term = taxonomy_term_load($raw_value);
  return $term->name;
}

/**
 * Helper function to return advanced view mode.
 */
function ds_views_row_adv_ds_testing($entity, $view_mode, $load_comments) {
  return 'Advanced display for id ' . $entity->nid;
}

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

  // Register a single field to test that
  // extra fields in the hidden region are really hidden.
  $extra['node']['article']['display']['heavy_field'] = array(
   'label' => t('Heavy extra test field'),
   'weight' => 10,
  );

  return $extra;
}

/**
 * Implements hook_node_view().
 */
function ds_test_node_view($node, $view_mode, $langcode) {
  $node->content['ds_extras_extra_test_field'] = array(
    '#markup' => 'This is an extra field made available through "Extra fields" functionality.',
    '#weight' => 10,
  );

  // Check whether the heavy extra field is rendered or not.
  if ($node->type == 'article') {
    $fields = field_extra_fields_get_display('node', 'article', $view_mode);
    if (isset($fields['heavy_field']) && $fields['heavy_field']['visible']) {
      $node->content['heavy_field'] = array(
        '#markup' => 'Heavy field',
        '#weight' => $fields['heavy_field']['weight'],
      );
    }
  }
}

/**
 * Implements hook_ds_layout_info_alter().
 */
function ds_test_ds_layout_info_alter(&$layouts) {
  unset($layouts['ds_3col_stacked_equal_width']);
}

/**
 * Implements hook_ds_fields_info().
 */
function ds_test_ds_fields_info($entity_type) {
  if ($entity_type == 'node') {
    $fields['node']['ds_test_field'] = array(
      'title' => t('Test code field from hook'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_test_field',
    );
    $fields['node']['ds_test_field_2'] = array(
      'title' => t('Test code field from hook 2'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_test_field',
    );
    $fields['node']['ds_test_field_empty_string'] = array(
      'title' => t('Test code field that returns an empty string'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_empty_string',
    );
    $fields['node']['ds_test_field_false'] = array(
      'title' => t('Test code field that returns FALSE'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_false',
    );
    $fields['node']['ds_test_field_null'] = array(
      'title' => t('Test code field that returns NULL'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_null',
    );
    $fields['node']['ds_test_field_nothing'] = array(
      'title' => t('Test code field that returns nothing'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_nothing',
    );
    $fields['node']['ds_test_field_zero_int'] = array(
      'title' => t('Test code field that returns zero as an integer'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_zero_int',
    );
    $fields['node']['ds_test_field_zero_string'] = array(
      'title' => t('Test code field that returns zero as a string'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_zero_string',
    );
    $fields['node']['ds_test_field_zero_float'] = array(
      'title' => t('Test code field that returns zero as a floating point number'),
      'field_type' => DS_FIELD_TYPE_FUNCTION,
      'function' => 'dstest_render_zero_float',
    );

    return $fields;
  }
}

/**
 * Implements hook_ds_field_theme_functions_info().
 */
function ds_test_ds_field_theme_functions_info() {
  return array('ds_test_theming_function' => t('Field test function'));
}

/**
 * Theme field test function.
 */
function ds_test_theming_function($variables) {
  return 'Testing field output through custom function';
}

/**
 * Render the test code field.
 */
function dstest_render_test_field($field) {
  return 'Test code field on node ' . $field['entity']->nid;
}

/**
 * Test code field that returns an empty string.
 */
function dstest_render_empty_string() {
  return '';
}

/**
 * Test code field that returns FALSE.
 */
function dstest_render_false() {
  return FALSE;
}

/**
 * Test code field that returns NULL.
 */
function dstest_render_null() {
  return NULL;
}

/**
 * Test code field that returns nothing.
 */
function dstest_render_nothing() {
  return;
}

/**
 * Test code field that returns zero as an integer.
 */
function dstest_render_zero_int() {
  return 0;
}

/**
 * Test code field that returns zero as a string.
 */
function dstest_render_zero_string() {
  return '0';
}

/**
 * Test code field that returns zero as a floating point number.
 */
function dstest_render_zero_float() {
  return 0.0;
}

/**
 * Implements hook_ds_fields_info_alter().
 */
function ds_test_ds_fields_info_alter(&$fields, $entity_type) {
  if (isset($fields['ds_test_field_2'])) {
    $fields['ds_test_field_2']['title'] = 'Field altered';
  }
}

/**
 * Implements hook_ds_layouts_info().
 */
function ds_test_ds_layout_info() {
  $path = drupal_get_path('module', 'ds_test');
  $layouts = array(
    'dstest_1col' => array(
      'label' => t('Test One column'),
      'path' => $path . '/dstest_1col',
      'regions' => array(
        'ds_content' => t('Content'),
      ),
    ),
    'dstest_2col' => array(
      'label' => t('Test Two column'),
      'path' => $path . '/dstest_2col',
      'regions' => array(
        'left' => t('Left'),
        'right' => t('Right')
      ),
      'css' => TRUE,
    ),
  );

  return $layouts;
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function ds_test_form_field_ui_display_overview_form_alter(&$form, &$form_state) {
  foreach (element_children($form['fields']) as $key) {
    if (isset($form['fields'][$key]['settings_edit'])) {
      $settings = $form['fields'][$key]['settings_edit'];
      if (!empty($settings)) {
        $form['fields'][$key]['settings_edit']['#type'] = 'submit';
        $form['fields'][$key]['settings_edit']['#value'] = 'edit ' . $key;
      }
    }
  }
}

/**
 * Implements hook_ds_pre_render_alter().
 */
function ds_test_ds_pre_render_alter(&$layout_render_array, $context) {
  $entity = $context['entity'];
  if (isset($entity->title) && $entity->title === 'Alter me!') {
    $layout_render_array['left'][] = array('#markup' => 'cool!', '#weight' => 20);
  }
}