Club Drupal

<?php

/**

 * @file

 * Internationalization (i18n) submodule: Menu translation.

 *

 * @author Jose A. Reyero, 2005

 *

 */

/**

 * Implements hook_menu()

 */

function i18n_menu_menu() {

  $items['admin/structure/menu/manage/translation'] = array(

    'title' => 'Translation sets',

    'page callback' => 'i18n_translation_set_list_manage',

    'page arguments' => array('menu_link'),

    'access arguments' => array('administer menu'),

    'type' => MENU_LOCAL_TASK,

    'weight' => 10,

  );

  $items['admin/structure/menu/manage/translation/add'] = array(

    'title' => 'Add translation',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('i18n_menu_translation_form'),

    'access arguments' => array('administer menu'),

    'type' => MENU_LOCAL_ACTION,

    'file' => 'i18n_menu.admin.inc',

  );

  $items['admin/structure/menu/manage/translation/edit/%i18n_menu_translation'] = array(

    'title' => 'Edit translation',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('i18n_menu_translation_form', 6),

    'access arguments' => array('administer menu'),

    'type' => MENU_CALLBACK,

    'file' => 'i18n_menu.admin.inc',

  );

  $items['admin/structure/menu/manage/translation/delete/%i18n_menu_translation'] = array(

    'title' => 'Delete translation',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('i18n_translation_set_delete_confirm', 6),

    'access arguments' => array('administer menu'),

    'type' => MENU_CALLBACK,

  );

  return $items;

}

/**

 * Implements hook_menu_alter()

 */

function i18n_menu_menu_alter(&$items) {

  $items['admin/structure/menu/item/%menu_link'] = $items['admin/structure/menu/item/%menu_link/edit'];

  $items['admin/structure/menu/item/%menu_link']['type'] = MENU_CALLBACK;

  $items['admin/structure/menu/item/%menu_link/edit']['type'] = MENU_DEFAULT_LOCAL_TASK;

}

/**

 * Implements hook_block_view().

 */

function i18n_menu_block_view_alter(&$data, $block) {

  if (($block->module == 'menu' || $block->module == 'system') && (i18n_menu_mode($block->delta) & I18N_MODE_MULTIPLE)) {

    $menus = menu_get_menus();

    if (isset($menus[$block->delta])) {

      if (empty($block->title)) {

        $data['subject'] = i18n_string_plain(

          array('menu', 'menu', $block->delta, 'title'),

          $menus[$block->delta]

        );

      }

      // Add contextual links for this block.

      if (!empty($data['content'])) {

        $data['content']['#contextual_links']['menu'] = array('admin/structure/menu/manage', array($block->delta));

      }

    }

  }

}

/**

 * Implements hook_i18n_translate_path()

 */

function i18n_menu_i18n_translate_path($path) {

  $item = i18n_menu_link_load($path, i18n_langcode());

  if ($item && ($set = i18n_translation_object('menu_link', $item))) {

    $links = array();

    foreach ($set->get_translations() as $lang => $link) {

      $links[$lang] = array(

        'href' => $link['link_path'],

        'title' => $link['link_title'],

        'i18n_type' => 'menu_link',

        'i18n_object' => $link,

      );

    }

    return $links;

  }

}

/**

 * Implements hook_menu_insert()

 */

function i18n_menu_menu_insert($menu) {

  i18n_menu_menu_update($menu);

}

/**

 * Implements hook_menu_update()

 */

function i18n_menu_menu_update($menu) {

  // Stores the fields of menu links which need an update.

  $update = array();

  if (!isset($menu['i18n_mode'])) {

    $menu['i18n_mode'] = I18N_MODE_NONE;

  }

  if (!($menu['i18n_mode'] & I18N_MODE_LANGUAGE)) {

    $menu['language'] = LANGUAGE_NONE;

  }

  db_update('menu_custom')

    ->fields(array('language' => $menu['language'], 'i18n_mode' => $menu['i18n_mode']))

    ->condition('menu_name', $menu['menu_name'])

    ->execute();

  if (!$menu['i18n_mode']) {

    $update['language'] = LANGUAGE_NONE;

  }

  elseif ($menu['i18n_mode'] & I18N_MODE_LANGUAGE) {

    $update['language'] = $menu['language'];

  }

  // Non translatable menu.

  if (!($menu['i18n_mode'] & I18N_MODE_TRANSLATE)) {

    $tsids = db_select('menu_links')

      ->fields('menu_links', array('i18n_tsid'))

      ->groupBy('i18n_tsid')

      ->condition('menu_name', $menu['menu_name'])

      ->condition('customized', 1)

      ->condition('i18n_tsid', 0, '<>')

      ->execute()

      ->fetchCol(0);

    if (!empty($tsids)) {

      foreach ($tsids as $tsid) {

        if ($translation_set = i18n_translation_set_load($tsid)) {

          $translation_set->delete();

        }

      }

    }

    $update['i18n_tsid'] = 0;

  }

  if (!empty($update)) {

    db_update('menu_links')

      ->fields($update)

      ->condition('menu_name', $menu['menu_name'])

      ->condition('customized', 1)

      ->execute();

  }

  // Update strings, always add translation if no language

  if (!i18n_object_langcode($menu)) {

    i18n_string_object_update('menu', $menu);

  }

  // Clear all menu caches.

  menu_cache_clear_all();

}

/**

 * Implements hook_menu_delete()

 */

function i18n_menu_menu_delete($menu) {

  i18n_string_object_remove('menu', $menu);

}

/**

 * Implements hook_menu_link_alter().

 *

 * This function is invoked from menu_link_save() before default

 * menu link options (menu_name, module, etc.. have been set)

 */

function i18n_menu_menu_link_alter(&$item) {

  // We just make sure every link has a valid language property.

  if (!i18n_object_langcode($item)) {

    $item['language'] = LANGUAGE_NONE;

  }

}

/**

 * Implements hook_menu_link_insert()

 */

function i18n_menu_menu_link_insert($link) {

  i18n_menu_menu_link_update($link);

}

/**

 * Implements hook_menu_link_update().

 */

function i18n_menu_menu_link_update($link) {

  // Stores the fields to update.

  $fields = array();

  $menu_mode = i18n_menu_mode($link['menu_name']);

  if ($menu_mode & I18N_MODE_TRANSLATE && isset($link['language'])) {

    // Multilingual menu links, translatable, it may be part of a

    // translation set.

    if (i18n_object_langcode($link)) {

      if (!empty($link['translation_set'])) {

        // Translation set comes as parameter, we may be creating a translation,

        // add link to the set.

        $translation_set = $link['translation_set'];

        $translation_set

          ->add_item($link)

          ->save(TRUE);

      }

    }

    elseif ($link['language'] === LANGUAGE_NONE && !empty($link['original_item']['i18n_tsid'])) {

      if ($translation_set = i18n_translation_set_load($link['original_item']['i18n_tsid'])) {

        $translation_set->remove_language($link['original_item']['language']);

        // If there are no links left in this translation set, delete the set.

        // Otherwise update the set.

        $translation_set->update_delete();

      }

      $fields['i18n_tsid'] = 0;

    }

  }

  // For multilingual menu items, always set a language and mark them for

  // 'alter' so they can be processed later by

  // hook_translated_link_menu_alter().

  if ($menu_mode) {

    if (!isset($link['language'])) {

      $link['language'] = LANGUAGE_NONE;

    }

    if (_i18n_menu_link_check_alter($link) && empty($link['options']['alter'])) {

      $fields['options'] = $link['options'];

      $fields['options']['alter'] = TRUE;

    }

    // We cannot unmark links for altering because we don't know what other

    // modules use it for.

  }

  // Update language field if the link has a language value.

  if (isset($link['language'])) {

    $fields['language'] = $link['language'];

  }

  if (!empty($fields)) {

    // If link options are to be updated, they need to be serialized.

    if (isset($fields['options'])) {

      $fields['options'] = serialize($fields['options']);

    }

    db_update('menu_links')

      ->fields($fields)

      ->condition('mlid', $link['mlid'])

      ->execute();

  }

  // Update translatable strings if any for customized links that belong to a

  // localizable menu.

  if (_i18n_menu_link_is_localizable($link)) {

    i18n_string_object_update('menu_link', $link);

  }

  else {

    i18n_string_object_remove('menu_link', $link);

  }

}

/**

 * Implements hook_menu_delete()

 */

function i18n_menu_menu_link_delete($link) {

  // If a translation set exists for this link, remove this link from the set.

  if (!empty($link['i18n_tsid'])) {

    if ($translation_set = i18n_translation_set_load($link['i18n_tsid'])) {

      $translation_set->get_translations();

      $translation_set->remove_language($link['language']);

      // If there are no links left in this translation set, delete the set.

      // Otherwise update the set.

      $translation_set->update_delete();

    }

  }

  i18n_string_object_remove('menu_link', $link);

}

/**

 * Get menu mode or compare with given one

 */

function i18n_menu_mode($name, $mode = NULL) {

  $menu = menu_load($name);

  if (!$menu || !isset($menu['i18n_mode'])) {

    return isset($mode) ? FALSE : I18N_MODE_NONE;

  }

  else {

    return isset($mode) ? $menu['i18n_mode'] & $mode : $menu['i18n_mode'];

  }

}

/**

 * Implements hook_translated_menu_link_alter().

 *

 * Translate localizable menu links on the fly.

 * Filter out items that have a different language from current interface.

 *

 * @see i18n_menu_menu_link_alter()

 */

function i18n_menu_translated_menu_link_alter(&$item) {

  // Only process links to be displayed not processed before by i18n_menu.

  if (_i18n_menu_link_process($item)) {

    if (!_i18n_menu_link_is_visible($item)) {

      $item['hidden'] = TRUE;

    }

    elseif (_i18n_menu_link_is_localizable($item)) {

      // Item has undefined language, it is a candidate for localization.

      _i18n_menu_link_localize($item);

    }

  }

}

/**

 * Implements hook_help().

 */

function i18n_menu_help($path, $arg) {

  switch ($path) {

    case 'admin/help#i18n_menu' :

      $output = '<p>' . t('This module adds support for multilingual menus. You can setup multilingual options for each menu:') . '</p>';

      $output .= '<ul>';

      $output .= '<li>' . t('Menus can be fully multilingual with translatable (or localized) menu items.') . '</li>';

      $output .= '<li>' . t('Menus can be configured to have a fixed language. All menu items share this language setting and the menu will be visible in that language only.') . '</li>';

      $output .= '<li>' . t('Menus can also be configured to have no translations.') . '</li>';

      $output .= '</ul>';

      $output .= '<p>' . t('The multilingual options of a menu must be configured before individual menu items can be translated. Go to the <a href="@menu-admin">Menus administration page</a> and follow the "edit menu" link to the menu in question.', array('@menu-admin' => url('admin/structure/menu') ) ) . '</p>';

      $output .= '<p>' . t('To search and translate strings, use the <a href="@translate-interface">translation interface</a> pages.', array('@translate-interface' => url('admin/config/regional/translate'))) . '</p>';

      return $output;

    case 'admin/config/regional/i18n':

      $output = '<p>' . t('Menus and menu items can be translated on the <a href="@configure_menus">Menu administration page</a>.', array('@configure_menus' => url('admin/structure/menu'))) . '</p>';

      return $output;

  }

}

/**

 * Implements hook_variable_info_alter()

 */

function i18n_menu_variable_info_alter(&$variables, $options) {

  // Make menu variables translatable

  $variables['menu_main_links_source']['localize'] = TRUE;

  $variables['menu_secondary_links_source']['localize'] = TRUE;

  $variables['menu_parent_[node_type]']['localize'] = TRUE;

  $variables['menu_options_[node_type]']['localize'] = TRUE;

}

/**

 * Get localized menu tree.

 *

 * @param string $menu_name

 *   The menu the translated tree has to be fetched from.

 * @param string $langcode

 *   Optional language code to get the menu in, defaults to request language.

 * @param bool $reset

 *   Whether to reset the internal i18n_menu_translated_tree cache.

 */

function i18n_menu_translated_tree($menu_name, $langcode = NULL, $reset = FALSE) {

  $menu_output = &drupal_static(__FUNCTION__);

  $langcode = $langcode ? $langcode : i18n_language_interface()->language;

  if (!isset($menu_output[$langcode][$menu_name]) || $reset) {

    $tree = menu_tree_page_data($menu_name);

    $tree = i18n_menu_localize_tree($tree, $langcode);

    $menu_output[$langcode][$menu_name] = menu_tree_output($tree);

  }

  return $menu_output[$langcode][$menu_name];

}

/**

 * Localize menu tree.

 */

function i18n_menu_localize_tree($tree, $langcode = NULL) {

  $langcode = $langcode ? $langcode : i18n_language_interface()->language;

  foreach ($tree as $index => &$item) {

    $link = $item['link'];

    // We only process links that are visible and not processed before.

    if (_i18n_menu_link_process($item['link'])) {

      if (!_i18n_menu_link_is_visible($item['link'], $langcode)) {

        // Remove links for other languages than current.

        // Links with language wont be localized.

        unset($tree[$index]);

        // @todo Research whether the above has any advantage over:

        // $item['hidden'] = TRUE;

      }

      else {

        if (_i18n_menu_link_is_localizable($item['link'])) {

          // Item has undefined language, it is a candidate for localization.

          _i18n_menu_link_localize($item['link'], $langcode);

        }

        // Localize subtree.

        if (!empty($item['below'])) {

          $item['below'] = i18n_menu_localize_tree($item['below'], $langcode);

        }

      }

    }

  }

  return $tree;

}

/**

 * Localize menu renderable array

 */

function i18n_menu_localize_elements(&$elements) {

  foreach (element_children($elements) as $mlid) {

    $elements[$mlid]['#title'] = i18n_string(array('menu', 'item', $mlid, 'title'), $elements[$mlid]['#title']);

    if (!empty($tree[$mlid]['#localized_options']['attributes']['title'])) {

      $elements[$mlid]['#localized_options']['attributes']['title'] = i18n_string(array('menu', 'item', $mlid, 'description'), $tree[$mlid]['#localized_options']['attributes']['title']);

    }

    i18n_menu_localize_elements($elements[$mlid]);

  }

}

/**

 * Return an array of localized links for a navigation menu.

 *

 * Localized version of menu_navigation_links()

 */

function i18n_menu_navigation_links($menu_name, $level = 0) {

  // Don't even bother querying the menu table if no menu is specified.

  if (empty($menu_name)) {

    return array();

  }

  // Get the menu hierarchy for the current page.

  $tree = menu_tree_page_data($menu_name, $level + 1);

  $tree = i18n_menu_localize_tree($tree);

  // Go down the active trail until the right level is reached.

  while ($level-- > 0 && $tree) {

    // Loop through the current level's items until we find one that is in trail.

    while ($item = array_shift($tree)) {

      if ($item['link']['in_active_trail']) {

        // If the item is in the active trail, we continue in the subtree.

        $tree = empty($item['below']) ? array() : $item['below'];

        break;

      }

    }

  }

  // Create a single level of links.

  $router_item = menu_get_item();

  $links = array();

  foreach ($tree as $item) {

    if (!$item['link']['hidden']) {

      $class = '';

      $l = $item['link']['localized_options'];

      $l['href'] = $item['link']['href'];

      $l['title'] = $item['link']['title'];

      if ($item['link']['in_active_trail']) {

        $class = ' active-trail';

        $l['attributes']['class'][] = 'active-trail';

      }

      // Normally, l() compares the href of every link with $_GET['q'] and sets

      // the active class accordingly. But local tasks do not appear in menu

      // trees, so if the current path is a local task, and this link is its

      // tab root, then we have to set the class manually.

      if ($item['link']['href'] == $router_item['tab_root_href'] && $item['link']['href'] != $_GET['q']) {

        $l['attributes']['class'][] = 'active';

      }

      // Keyed with the unique mlid to generate classes in theme_links().

      $links['menu-' . $item['link']['mlid'] . $class] = $l;

    }

  }

  return $links;

}

/**

 * Get localized menu title

 */

function _i18n_menu_link_title($link, $langcode = NULL) {

  $key = i18n_object_info('menu_link', 'key');

  return i18n_string_translate(array('menu', 'item', $link[$key], 'title'), $link['link_title'], array('langcode' => $langcode, 'sanitize' => FALSE));

}

/**

 * Localize menu item title and description.

 *

 * This will be invoked always after _menu_item_localize()

 *

 * Link properties to manage:

 * - title, menu router title

 * - link_title, menu link title

 * - options.attributes.title, menu link description.

 * - localized_options.attributes.title,

 *

 * @see _menu_item_localize()

 * @see _menu_link_translate()

 */

function _i18n_menu_link_localize(&$link, $langcode = NULL) {

  // Only translate title if it has no special callback.

  if (empty($link['title callback']) || $link['title callback'] === 't') {

    $link['title'] = _i18n_menu_link_title($link, $langcode);

  }

  if ($description = _i18n_menu_link_description($link, $langcode)) {

    $link['localized_options']['attributes']['title'] = $description;

  }

}

/**

 * Get localized menu description

 */

function _i18n_menu_link_description($link, $langcode = NULL) {

  if (!empty($link['options']['attributes']['title'])) {

    $key = i18n_object_info('menu_link', 'key');

    return i18n_string_translate(array('menu', 'item', $link[$key], 'description'), $link['options']['attributes']['title'], array('langcode' => $langcode));

  }

  else {

    return NULL;

  }

}

/**

 * Check whether this link is to be processed by i18n_menu and start processing.

 */

function _i18n_menu_link_process(&$link) {

  // Only visible links that have a language property and haven't been processed

  // before. We also check that they belong to a menu with language options.

  if (empty($link['i18n_menu']) && !empty($link['language']) && !empty($link['access']) && empty($link['hidden']) && i18n_menu_mode($link['menu_name'])) {

    // Mark so it won't be processed twice.

    $link['i18n_menu'] = TRUE;

    // Skip if administering this menu or this menu item.

    if (arg(0) == 'admin' && arg(1) == 'structure' && arg(2) == 'menu') {

      if (arg(3) == 'manage' && $link['menu_name'] == arg(4)) {

        return FALSE;

      }

      elseif (arg(3) == 'item' && arg(4) == $link['mlid']) {

        return FALSE;

      }

    }

    // Skip if administering this menu item through the node edit form.

    elseif (arg(0) == 'node' && arg(2) == 'edit' && $link['link_path'] == arg(0) . '/' . arg(1)) {

      return FALSE;

    }

    return TRUE;

  }

  else {

    return FALSE;

  }

}

/**

 * Check whether this menu item should be marked for altering.

 *

 * Menu items that have a language or that have any localizable strings

 * will be marked to be run through hook_translated_menu_link_alter().

 *

 * @see i18n_menu_translated_menu_link_alter()

 */

function _i18n_menu_link_check_alter($link) {

  return i18n_menu_mode($link['menu_name']) && (i18n_object_langcode($link) || _i18n_menu_link_is_localizable($link, TRUE));

}

/**

 * Check whether this link should be localized by i18n_menu.

 *

 * @param array $link

 *   Menu link array.

 * @param bool $check_strings

 *   Whether to check if the link has actually localizable strings. Since this

 *   is a more expensive operation, it will be just checked when editing menu

 *   items.

 *

 * @return boolean

 *   Returns TRUE if link is localizable.

 */

function _i18n_menu_link_is_localizable($link, $check_strings = FALSE) {

  return !empty($link['customized']) && !i18n_object_langcode($link) && i18n_menu_mode($link['menu_name'], I18N_MODE_LOCALIZE) &&

  (!$check_strings || _i18n_menu_link_localizable_properties($link));

}

/**

 * Check whether this menu link is visible for current/given language.

 */

function _i18n_menu_link_is_visible($link, $langcode = NULL) {

  $langcode = $langcode ? $langcode : i18n_language_interface()->language;

  return $link['language'] == LANGUAGE_NONE || $link['language'] == $langcode;

}

/**

 * Get localizable properties for menu link checking agains the router item.

 */

function _i18n_menu_link_localizable_properties($link) {

  $props = array();

  $router = !empty($link['router_path']) ? _i18n_menu_get_router($link['router_path']) : NULL;

  if (!empty($link['link_title'])) {

    // If the title callback is 't' and the link title matches the router title

    // it will be localized by core, not by i18n_menu.

    if (!$router ||

        (empty($router['title_callback']) || ($router['title_callback'] != 't' || !empty($link['customized']))) ||

        (empty($router['title']) || $router['title'] != $link['link_title'])

    ) {

      $props[] = 'title';

    }

  }

  if (!empty($link['options']['attributes']['title'])) {

    // If the description matches the router description, it will be localized

    // by core.

    if (!$router || empty($router['description']) || ($router['description'] != $link['options']['attributes']['title']) || !empty($link['customized'])) {

      $props[] = 'description';

    }

  }

  return $props;

}

/**

 * Get the menu router for this router path.

 *

 * We need the untranslated title to compare, and this will be fast.

 * There's no api function to do this?

 *

 * @param string $path

 *   The path to fetch from the router.

 */

function _i18n_menu_get_router($path) {

  $cache = &drupal_static(__FUNCTION__, array());

  if (!array_key_exists($path, $cache)) {

    $cache[$path] = db_select('menu_router', 'mr')

      ->fields('mr', array('title', 'title_callback', 'description'))

      ->condition('path', $path)

      ->execute()

      ->fetchAssoc();

  }

  return $cache[$path];

}

/**

 * Implements hook_form_FORM_ID_alter().

 */

function i18n_menu_form_menu_edit_menu_alter(&$form, &$form_state) {

  $menu = menu_load($form['old_name']['#value']);

  $i18n_mode = $menu && isset($menu['i18n_mode']) ? $menu['i18n_mode'] : I18N_MODE_NONE;

  $langcode = $menu && isset($menu['language']) ? $menu['language'] : LANGUAGE_NONE;

  $form += i18n_translation_mode_element('menu', $i18n_mode, $langcode);

}

/**

 * Implements hook_form_FORM_ID_alter().

 *

 * Add a language selector to the menu_edit_item form and register a submit

 * callback to process items.

 */

function i18n_menu_form_menu_edit_item_alter(&$form, &$form_state) {

  $item = &$form['original_item']['#value'];

  $item['language'] = i18n_menu_item_get_language($item);

  // Check whether this item belongs to a node object and it is a supported type.

  $node_item = ($node = i18n_menu_item_get_node($item)) && i18n_menu_node_supported_type($node->type);

  if (!$node_item && i18n_menu_mode($item['menu_name'], I18N_MODE_TRANSLATE)) {

    //$form['i18n'] = array('#type' => 'fieldset');

    $form['i18n']['language'] = array(

      '#description' => t('This item belongs to a multilingual menu. You can set a language for it.'),

    ) + i18n_element_language_select($item);

    // If the term to be added will be a translation of a source term,

    // set the default value of the option list to the target language and

    // create a form element for storing the translation set of the source term.

    if (isset($_GET['translation']) && isset($_GET['target']) && ($source_item = menu_link_load($_GET['translation']))) {

      if (!empty($source_item['i18n_tsid'])) {

        $translation_set = i18n_translation_set_load($source_item['i18n_tsid']);

      }

      else {

        // Create object and stick the source information in the translation set.

        $translation_set = i18n_translation_set_build('menu_link')

          ->add_item($source_item);

      }

      $form['link_path']['#default_value'] = $source_item['link_path'];

      // Maybe we should disable the 'link_path' and 'parent' form elements?

      // $form['link_path']['#disabled'] = TRUE;

      // $form['parent']['#disabled'] = TRUE;

      $form['i18n']['language']['#default_value'] = $_GET['target'];

      $form['i18n']['language']['#disabled'] = TRUE;

      drupal_set_title(t('%language translation of menu item %title', array('%language' => locale_language_name($_GET['target']), '%title' => $source_item['link_title'])), PASS_THROUGH);

    }

    elseif (!empty($item['i18n_tsid'])) {

      $translation_set = i18n_translation_set_load($item['i18n_tsid']);

    }

    // Add the translation set to the form so we know the new menu item

    // needs to be added to that set.

    if (!empty($translation_set)) {

      $form['translation_set'] = array(

        '#type' => 'value',

        '#value' => $translation_set,

      );

      // If the current term is part of a translation set,

      // remove all other languages of the option list.

      if ($translations = $translation_set->get_translations()) {

        unset($form['i18n']['language']['#options'][LANGUAGE_NONE]);

        foreach ($translations as $langcode => $translation) {

          if ($translation['mlid'] !== $item['mlid']) {

            unset($form['i18n']['language']['#options'][$langcode]);

          }

        }

      }

    }

  }

  else {

    $form['language'] = array(

      '#type' => 'value',

      '#value' => $item['language'],

    );

  }

  if ($node_item && i18n_langcode($item['language'])) {

    $form['i18n']['message'] = array(

      '#type' => 'item',

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

      '#markup' => i18n_language_name($item['language']),

      '#description' => t('This menu item belongs to a node, so it will have the same language as the node and cannot be localized.'),

    );

  }

  array_unshift($form['#validate'], 'i18n_menu_menu_item_prepare_normal_path');

}

/**

 * Implements hook_form_FORM_ID_alter().

 * FORM_ID = menu-overview-form.

 * Add a "translate" link in operations column for each menu item.

 */

function i18n_menu_form_menu_overview_form_alter(&$form, &$form_state) {

  foreach (element_children($form) as $element) {

    if (substr($element, 0, 5) == 'mlid:') {

      $mlid = $form[$element]['#item']['mlid'];

      if (i18n_get_object('menu', $mlid)->get_translate_access()) {

        $form[$element]['operations']['translate'] = array(

          '#type' => 'link',

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

          '#href' => "admin/structure/menu/item/{$mlid}/translate",

        );

      }

    }

  }

}

/**

 * Normal path should be checked with menu item's language to avoid

 * troubles when a node and it's translation has the same url alias.

 */

function i18n_menu_menu_item_prepare_normal_path($form, &$form_state) {

  $item = &$form_state['values'];

  $item['link_path'] = i18n_prepare_normal_path($item['link_path'], $item['language']);

}

/**

 * Get language for menu item

 */

function i18n_menu_item_get_language($item) {

  if (isset($item['language'])) {

    return $item['language'];

  }

  else {

    $menu = menu_load($item['menu_name']);

    if (!isset($menu['i18n_mode'])) {

      return LANGUAGE_NONE;

    }

    switch ($menu['i18n_mode']) {

      case I18N_MODE_LANGUAGE:

        return $menu['language'];

      case I18N_MODE_NONE:

      case I18N_MODE_LOCALIZE:

        return LANGUAGE_NONE;

      default:

        if (!empty($item['mlid'])) {

          return db_select('menu_links', 'm')

            ->fields('m', array('language'))

            ->condition('mlid', $item['mlid'])

            ->execute()

            ->fetchField();

        }

        else {

          return LANGUAGE_NONE;

        }

    }

  }

}

/**

 * Implements hook_form_node_form_alter().

 *

 * Add language to menu settings of the node form, as well as setting defaults

 * to match the translated item's menu settings.

 */

function i18n_menu_form_node_form_alter(&$form, &$form_state, $form_id) {

  if (isset($form['menu'])) {

    $node = $form['#node'];

    $link = $node->menu;

    if (!empty($link['mlid'])) {

      // Preserve the menu item language whatever it is.

      $form['menu']['link']['language'] = array('#type' => 'value', '#value' => $link['language']);

    }

    elseif (i18n_menu_node_supported_type($node->type)) {

      // Set menu language to node language but only if it is a supported node type.

      $form['menu']['link']['language'] = array('#type' => 'value', '#value' => $node->language);

    }

    else {

      $form['menu']['link']['language'] = array('#type' => 'value', '#value' => LANGUAGE_NONE);

    }

    // Customized must be set to 1 to save language.

    $form['menu']['link']['customized'] = array('#type' => 'value', '#value' => 1);

  }

}

/**

 * Check whether a node type has multilingual support (but not entity translation).

 */

function i18n_menu_node_supported_type($type) {

  $supported = &drupal_static(__FUNCTION__);

  if (!isset($supported[$type])) {

    $mode = variable_get('language_content_type_' . $type, 0);

    $supported[$type] = $mode == 1 || $mode == 2; // 2 == TRANSLATION_ENABLED

  }

  return $supported[$type];

}

/**

 * Get the node object for a menu item.

 */

function i18n_menu_item_get_node($item) {

  return isset($item['router_path']) && $item['router_path'] == 'node/%' ? node_load(arg(1, $item['link_path'])) : NULL;

}

/**

 * Implements hook_node_presave()

 *

 * Set menu link language to node language

 */

function i18n_menu_node_presave($node) {

  if (!empty($node->menu) && isset($node->language) && i18n_menu_node_supported_type($node->type)) {

    $node->menu['language'] = i18n_object_langcode($node, LANGUAGE_NONE);

    // Store node type with menu item so we can quickly access it later.

    $node->menu['options']['node_type'] = $node->type;

  }

}

/**

 * Implements hook_node_prepare_translation().

 */

function i18n_menu_node_prepare_translation($node) {

  if (empty($node->menu['mlid']) && !empty($node->translation_source)) {

    $tnode = $node->translation_source;

    // Prepare the tnode so the menu item will be available.

    node_object_prepare($tnode);

    $node->menu['link_title'] = $tnode->menu['link_title'];

    $node->menu['weight'] = $tnode->menu['weight'];

  }

}

/**

 * Process menu and menu item add/edit form submissions.

 *

 * @todo See where this fits

 */

/*

function i18n_menu_edit_item_form_submit($form, &$form_state) {

  $mid = menu_edit_item_save($form_state['values']);

  db_query("UPDATE {menu} SET language = '%s' WHERE mid = %d", array($form_state['values']['language'], $mid));

  return 'admin/build/menu';

}

*/

/**

 * Load translation set. Menu loading callback.

 */

function i18n_menu_translation_load($tsid) {

  return i18n_translation_set_load($tsid, 'menu_link');

}

/**

 * Load menu item by path, language

 */

function i18n_menu_link_load($path, $langcode) {

  $query = db_select('menu_links', 'ml');

  $query->leftJoin('menu_router', 'm', 'm.path = ml.router_path');

  $query->fields('ml');

  // Weight should be taken from {menu_links}, not {menu_router}.

  $query->addField('ml', 'weight', 'link_weight');

  $query->fields('m');

  $query->condition('ml.link_path', $path);

  $query->condition('ml.language', $langcode);

  if ($item = $query->execute()->fetchAssoc()) {

    $item['weight'] = $item['link_weight'];

    _menu_link_translate($item);

    return $item;

  }

}

/**

 * Implements hook_query_TAG_alter() for features_menu_links.

 * Add needed fields to properly serialize localization information.

 */

function i18n_menu_query_features_menu_link_alter($query) {

  $query->fields('menu_links', array('language', 'customized'));

}

/**

 * Implements hook_init().

 */

function i18n_menu_init() {

  // The only way to override the default preferred menu link for a path is to

  // inject it into the static cache of the function menu_link_get_preferred().

  // The problem with the default implementation is that it does not take the

  // language of a menu link into account. Whe having different menu trees for

  // different menus, this means that the active trail will not work for all but

  // one language.

  // The code below is identical to the mentioned function except the added

  // language condition on the query.

  // TODO: Adding an alter tag to the query would allow to do this with a simple

  // hook_query_alter() implementation.

  $preferred_links = &drupal_static('menu_link_get_preferred');

  $path = $_GET['q'];

  // Look for the correct menu link by building a list of candidate paths,

  // which are ordered by priority (translated hrefs are preferred over

  // untranslated paths). Afterwards, the most relevant path is picked from

  // the menus, ordered by menu preference.

  $item = menu_get_item($path);

  $path_candidates = array();

  // 1. The current item href.

  $path_candidates[$item['href']] = $item['href'];

  // 2. The tab root href of the current item (if any).

  if ($item['tab_parent'] && ($tab_root = menu_get_item($item['tab_root_href']))) {

    $path_candidates[$tab_root['href']] = $tab_root['href'];

  }

  // 3. The current item path (with wildcards).

  $path_candidates[$item['path']] = $item['path'];

  // 4. The tab root path of the current item (if any).

  if (!empty($tab_root)) {

    $path_candidates[$tab_root['path']] = $tab_root['path'];

  }

  // Retrieve a list of menu names, ordered by preference.

  $menu_names = menu_get_active_menu_names();

  // Use an illegal menu name as the key for the preferred menu link.

  $selected_menu = MENU_PREFERRED_LINK;

  // Put the selected menu at the front of the list.

  array_unshift($menu_names, $selected_menu);

  $query = db_select('menu_links', 'ml', array('fetch' => PDO::FETCH_ASSOC));

  $query->leftJoin('menu_router', 'm', 'm.path = ml.router_path');

  $query->fields('ml');

  // Weight must be taken from {menu_links}, not {menu_router}.

  $query->addField('ml', 'weight', 'link_weight');

  $query->fields('m');

  $query->condition('ml.link_path', $path_candidates, 'IN');

  // Only look menu links with none or the current language.

  $query->condition('ml.language', array(LANGUAGE_NONE, i18n_language_interface()->language), 'IN');

  // Sort candidates by link path and menu name.

  $candidates = array();

  foreach ($query->execute() as $candidate) {

    $candidate['weight'] = $candidate['link_weight'];

    $candidates[$candidate['link_path']][$candidate['menu_name']] = $candidate;

    // Add any menus not already in the menu name search list.

    if (!in_array($candidate['menu_name'], $menu_names)) {

      $menu_names[] = $candidate['menu_name'];

    }

  }

  // Store the most specific link for each menu. Also save the most specific

  // link of the most preferred menu in $preferred_link.

  foreach ($path_candidates as $link_path) {

    if (isset($candidates[$link_path])) {

      foreach ($menu_names as $menu_name) {

        if (empty($preferred_links[$path][$menu_name]) && isset($candidates[$link_path][$menu_name])) {

          $candidate_item = $candidates[$link_path][$menu_name];

          $map = explode('/', $path);

          _menu_translate($candidate_item, $map);

          if ($candidate_item['access']) {

            $preferred_links[$path][$menu_name] = $candidate_item;

            if (empty($preferred_links[$path][MENU_PREFERRED_LINK])) {

              // Store the most specific link.

              $preferred_links[$path][MENU_PREFERRED_LINK] = $candidate_item;

            }

          }

        }

      }

    }

  }

}