locale.module 19.3 KB
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<?php
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// $Id$
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/**
 * @file
 * Enables administrators to manage the site interface languages.
 *
 * When enabled, the site interface can be displayed in different
 * languages. The setup of languages and translations is completely
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 * web based. Gettext portable object files are supported.
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 */

// ---------------------------------------------------------------------------------
// Hook implementations (needed on all page loads)
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/**
 * Implementation of hook_help().
 */
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function locale_help($section = "admin/help#locale") {
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  switch ($section) {
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    case 'admin/modules#description':
      return t('Enables the translation of the user interface to languages other than English.');
    case 'admin/locale':
    case 'admin/locale/language/overview':
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      return t("<p>Drupal provides support for the translation of its interface text into different languages.  This page provides an overview of the installed languages. You can add a language on the <a href=\"%add-language\">add language page</a>, or directly by <a href=\"%import\">importing a translation</a>. If multiple languages are enabled, registered users will be able to set their preferred language.  The site default will be used for anonymous visitors and for users without their own settings.</p><p>Drupal interface translations may be added or extended by several courses: by <a href=\"%import\">importing</a> an existing translation, by <a href=\"%search\">translating everything</a> from scratch, or by a combination of these approaches.</p>", array("%search" => url("admin/locale/string/search"), "%import" => url("admin/locale/language/import"), "%add-language" => url("admin/locale/language/add")));
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    case 'admin/locale/language/add':
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      return t("<p>You need to add all languages in which you would like to display the site interface. If you can't find the desired language in the quick-add dropdown, then you will need to provide the proper language code yourself. The language code may be used to negotiate with browsers and to present flags, etc., so it is important to pick a code that is standardised for the desired language. You can also add a language by <a href=\"%import\">importing a translation</a>.</p>", array("%import" => url("admin/locale/language/import")));
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    case 'admin/locale/language/import':
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      return t("<p>This page allows you to import a translation provided in the gettext Portable Object (.po) format.  The easiest way to get your site translated is to obtain an existing Drupal translation and to import it.  You can find existing translations on the <a href=\"%url\">Drupal translation page</a>. Note that importing a translation file might take a while.</p>", array('%url' => 'http://drupal.org/project/translations'));
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    case 'admin/locale/language/export':
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      return t("<p>This page allows you to export Drupal strings. The first option is to export a translation so it can be shared.  The second option generates a translation template, which contains all Drupal strings, but without their translations. You can use this template to start a new translation using various software packages designed for this task.</p>");
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    case 'admin/locale/string/search':
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      return t("<p>It is often convenient to get the strings from your setup on the <a href=\"%export\">export page</a>, and use a desktop Gettext translation editor to edit the translations.  On this page you can search in the translated and untranslated strings, and the default English texts provided by Drupal.</p>", array("%export" => url("admin/locale/language/export")));
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    case 'admin/help#locale':
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      return t("
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      <p>Most programs are written and documented in English, and primarily use English to interact with users. This is also true for a great deal of web sites. However, many users are less comfortable with English than with their native language, and would prefer to use their mother tongue where possible.  Therefore Drupal provides a framework to setup a multi-lingual web site, or to overwrite the default English texts.</p>
      <h3>How interface translation works</h3>
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      <p>Whenever Drupal encounters an interface string which needs to be displayed, it tries to translate it into the currently selected language. If a translation is not available, then the string is remembered, so you can look up untranslated strings easily.</p>
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      <p>Drupal provides two options to translate these strings.  The first option is an integrated web interface, where you can search for untranslated strings, and provide translations for these via simple web forms.  An easier and faster method is to import translations already done for your language. This is achieved by the use of GNU gettext Portable Object files. These are editable with desktop editing tools designed for this purpose.  Drupal's import feature allows you to add strings from such files into the site database. The export functionality enables you to share your translations with others, generating Portable Object files from your site strings.");
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      break;
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  }
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}

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/**
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 * Implementation of hook_menu().
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 */
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function locale_menu($may_cache) {
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  $items = array();
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  if ($may_cache) {
    $access = user_access('administer locales');

    // Main admin menu item
    $items[] = array('path' => 'admin/locale', 'title' => t('localization'),
      'callback' => 'locale_admin_manage', 'access' => $access);
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    // Top level tabs
    $items[] = array('path' => 'admin/locale/language', 'title' => t('manage languages'),
      'access' => $access, 'weight' => -10, 'type' => MENU_DEFAULT_LOCAL_TASK);
    $items[] = array('path' => 'admin/locale/string/search', 'title' => t('manage strings'),
      'callback' => 'locale_admin_string', 'access' => $access, 'weight' => 10,
      'type' => MENU_LOCAL_TASK);
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    // Manage languages subtabs
    $items[] = array('path' => 'admin/locale/language/overview', 'title' => t('list'),
      'callback' => 'locale_admin_manage', 'access' => $access, "weight" => 0,
      'type' => MENU_DEFAULT_LOCAL_TASK);
    $items[] = array('path' => 'admin/locale/language/add', 'title' => t('add language'),
      'callback' => 'locale_admin_manage_add', 'access' => $access, "weight" => 5,
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/locale/language/import', 'title' => t('import'),
      'callback' => 'locale_admin_import', 'access' => $access, 'weight' => 10,
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/locale/language/export', 'title' => t('export'),
      'callback' => 'locale_admin_export', 'access' => $access, 'weight' => 20,
      'type' => MENU_LOCAL_TASK);
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    // Language related callbacks
    $items[] = array('path' => 'admin/locale/language/delete', 'title' => t('confirm'),
      'callback' => 'locale_admin_manage_delete_screen', 'access' => $access,
      'type' => MENU_CALLBACK);

    // String related callbacks
    $items[] = array('path' => 'admin/locale/string/edit', 'title' => t('edit'),
      'callback' => 'locale_admin_string', 'access' => $access, 'type' => MENU_CALLBACK);
    $items[] = array('path' => 'admin/locale/string/delete', 'title' => t('delete'),
      'callback' => 'locale_admin_string', 'access' => $access, 'type' => MENU_CALLBACK);
  }
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  return $items;
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}

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/**
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 * Implementation of hook_perm().
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 */
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function locale_perm() {
  return array('administer locales');
}

/**
 * Implementation of hook_user().
 */
function locale_user($type, $edit, &$user, $category = NULL) {
  $languages = locale_supported_languages();
  if ($type == 'form' && $category == 'account' && count($languages['name']) > 1) {
    if ($user->language == '') {
      $user->language = key($languages['name']);
    }
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    $languages['name'] = array_map('check_plain', $languages['name']);
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    return array(array('title' => t('Interface language settings'), 'data' => $form['locale_user'] = array('#type' => 'radios', '#title' => t('Language'), '#default_value' => $user->language, '#options' => $languages['name'], '#description' => t('Selecting a different locale will change the interface language of the site.'))));
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  }
}

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// ---------------------------------------------------------------------------------
// Locale core functionality (needed on all page loads)
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/**
 * Provides interface translation services
 *
 * This function is called from t() to translate a string if needed.
 */
function locale($string) {
  global $locale;
  static $locale_t;
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  // Store database cached translations in a static var
  if (!isset($locale_t)) {
    $cache = cache_get("locale:$locale");
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    if ($cache == 0) {
      locale_refresh_cache();
      $cache = cache_get("locale:$locale");
    }
    $locale_t = unserialize($cache->data);
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  }

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  // We have the translation cached (if it is TRUE, then there is no
  // translation, so there is no point in checking the database)
  if (isset($locale_t[$string])) {
    $string = ($locale_t[$string] === TRUE ? $string : $locale_t[$string]);
  }
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  // We don't have this translation cached, so get it from the DB
  else {
    $result = db_query("SELECT s.lid, t.translation FROM {locales_source} s INNER JOIN {locales_target} t ON s.lid = t.lid WHERE s.source = '%s' AND t.locale = '%s'", $string, $locale);
    // Translation found
    if ($trans = db_fetch_object($result)) {
      if (!empty($trans->translation)) {
        $locale_t[$string] = $trans->translation;
        $string = $trans->translation;
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      }
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    }
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    // Either we have no such source string, or no translation
    else {
      $result = db_query("SELECT lid, source FROM {locales_source} WHERE source = '%s'", $string);
      // We have no such translation
      if ($obj = db_fetch_object($result)) {
        if ($locale) {
          db_query("INSERT INTO {locales_target} (lid, locale) VALUES (%d, '%s')", $obj->lid, $locale);
        }
      }
      // We have no such source string
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      else {
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        db_query("INSERT INTO {locales_source} (location, source) VALUES ('%s', '%s')", request_uri(), $string);
        if ($locale) {
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          $lid = db_fetch_object(db_query("SELECT lid FROM {locales_source} WHERE source = '%s'", $string));
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          db_query("INSERT INTO {locales_target} (lid, locale) VALUES (%d, '%s')", $lid->lid, $locale);
        }
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      }
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      // Clear locale cache in DB
      cache_clear_all("locale:$locale");
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    }
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  }

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  return $string;
}
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/**
 * Refreshes database stored cache of translations
 *
 * We only store short strings to improve performance and consume less memory.
 */
function locale_refresh_cache() {
  $languages = locale_supported_languages();
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  foreach (array_keys($languages['name']) as $locale) {
    $result = db_query("SELECT s.source, t.translation, t.locale FROM {locales_source} s INNER JOIN {locales_target} t ON s.lid = t.lid WHERE t.locale = '%s' AND LENGTH(s.source) < 75", $locale);
    while ($data = db_fetch_object($result)) {
      $t[$data->source] = (empty($data->translation) ? TRUE : $data->translation);
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    }
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    cache_set("locale:$locale", serialize($t));
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  }
}

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/**
 * Returns list of languages supported on this site
 *
 * @param $reset Refresh cached language list
 * @param $getall Return all languages (even disabled ones)
 */
function locale_supported_languages($reset = FALSE, $getall = FALSE) {
  static $enabled = NULL;
  static $all = NULL;
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  if ($reset) {
    unset($enabled); unset($all);
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  }

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  if (is_null($enabled)) {
    $enabled = $all = array();
    $all['name'] = $all['formula'] = $enabled['name'] = $enabled['formula'] = array();
    $result = db_query('SELECT locale, name, formula, enabled FROM {locales_meta} ORDER BY isdefault DESC, enabled DESC, name ASC');
    while ($row = db_fetch_object($result)) {
      $all['name'][$row->locale] = $row->name;
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      $all['formula'][$row->locale] = $row->formula;
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      if ($row->enabled) {
        $enabled['name'][$row->locale] = $row->name;
        $enabled['formula'][$row->locale] = $row->formula;
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      }
    }
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  }
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  return $getall ? $all : $enabled;
}

/**
 * Returns plural form index for a specific number
 *
 * The index is computed from the formula of this language
 */
function locale_get_plural($count) {
  global $locale;
  static $locale_formula, $plurals = array();

  if (!isset($plurals[$count])) {
    if (!isset($locale_formula)) {
      $languages = locale_supported_languages();
      $locale_formula = $languages['formula'][$locale];
    }
    if ($locale_formula) {
      $n = $count;
      $plurals[$count] = @eval("return intval($locale_formula);");
      return $plurals[$count];
    }
    else {
      $plurals[$count] = -1;
      return -1;
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    }
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  }
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  return $plurals[$count];
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}
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// ---------------------------------------------------------------------------------
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// Language management functionality (administration only)
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/**
 * Page handler for the language management screen
 */
function locale_admin_manage() {
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  include_once './includes/locale.inc';
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  $edit = &$_POST['edit'];

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  if ($_POST['op'] == t('Save configuration')) {
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    // Save changes to existing languages
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    $languages = locale_supported_languages(FALSE, TRUE);
    foreach($languages['name'] as $key => $value) {
      if ($edit['sitedefault'] == $key) {
        $edit['enabled'][$key] = 1; // autoenable the default language
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      }
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      if ($key == 'en') {
        // Disallow name change for English locale
        db_query("UPDATE {locales_meta} SET isdefault = %d, enabled = %d WHERE locale = 'en'", ($edit['sitedefault'] == $key), $edit['enabled'][$key]);
      }
      else {
        db_query("UPDATE {locales_meta} SET name = '%s', isdefault = %d, enabled = %d WHERE locale = '%s'", $edit['name'][$key], ($edit['sitedefault'] == $key), $edit['enabled'][$key], $key);
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      }
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    }
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    // Changing the locale settings impacts the interface:
    cache_clear_all();
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    drupal_goto('admin/locale/language/overview');
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  }
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  return _locale_admin_manage_screen();
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}
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/**
 * User interface for the language deletion confirmation screen
 */
function locale_admin_manage_delete_screen() {
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  include_once './includes/locale.inc';
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  $langcode = arg(4);
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  $edit = $_POST['edit'];

  // Check confirmation and if so, delete language
  if ($edit['confirm']) {
    $languages = locale_supported_languages(FALSE, TRUE);
    if (isset($languages['name'][$edit['langcode']])) {
      db_query("DELETE FROM {locales_meta} WHERE locale = '%s'", $edit['langcode']);
      db_query("DELETE FROM {locales_target} WHERE locale = '%s'", $edit['langcode']);
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      $message = t('The language %locale has been removed.', array('%locale' => theme('placeholder', t($languages['name'][$edit['langcode']]))));
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      drupal_set_message($message);
      watchdog('locale', $message);
    }

    // Changing the locale settings impacts the interface:
    cache_clear_all();
    drupal_goto('admin/locale/language/overview');
  }
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  // Do not allow deletion of English locale
  if ($langcode == 'en') {
    drupal_goto('admin/locale/language/overview');
    return;
  }
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  // For other locales, warn user that data loss is ahead
  $languages = locale_supported_languages(FALSE, TRUE);
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  $form['langcode'] = array('#type' => 'hidden', '#value' => $langcode);
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  return confirm_form('locale_admin_manage_delete_screen', $form,
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                  t('Are you sure you want to delete the language %name?', array('%name' => theme('placeholder', t($languages['name'][$langcode])))),
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                  'admin/locale/language/overview',
                  t('Deleting a language will remove all data associated with it. This action cannot be undone.'),
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                  t('Delete'), t('Cancel'));
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}
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/**
 * Page handler for the language addition screen
 */
function locale_admin_manage_add() {
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  include_once './includes/locale.inc';
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  $edit = &$_POST['edit'];
  $isocodes = _locale_get_iso639_list();

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  // Check for duplicates
  if ($duplicate = db_num_rows(db_query("SELECT locale FROM {locales_meta} WHERE locale = '%s'", $edit['langcode'])) == 0) {
    switch ($_POST['op']) {
      // Try to add new language
      case t('Add language'):
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        // Set language name from the available list if needed
        if ($edit['langcode'] && !$edit['langname'] && isset($isocodes[$edit['langcode']])) {
          _locale_add_language($edit['langcode'], $isocodes[$edit['langcode']][0]);
          drupal_goto('admin/locale');
        }
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        break;
      case t('Add custom language'):
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        // Add language, if we have the details
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        if ($edit['langcode'] && $edit['langname']) {
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          _locale_add_language($edit['langcode'], $edit['langname']);
          drupal_goto('admin/locale');
        }
        // Seems like we have not received some data
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        drupal_set_message(t('The language code and the English name of the new language must be specified.'), 'error');
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        break;
      default:
        break;
    }
  }
  else {
    drupal_set_message(t('The language %language (%code) already exists.', array('%language' => theme('placeholder', check_plain($edit['langname'])), '%code' => theme('placeholder', $edit['langcode']))), 'error');
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  }
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  return _locale_admin_manage_add_screen();
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}
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// ---------------------------------------------------------------------------------
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// Gettext Portable Object import functionality (administration only)
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/**
 * Page handler for the translation import screen
 */
function locale_admin_import() {
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  include_once './includes/locale.inc';
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  $edit = &$_POST['edit'];
  switch ($_POST['op']) {
    case t('Import'):
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      // Add language, if not yet supported
      $languages = locale_supported_languages(TRUE, TRUE);
      if (!isset($languages['name'][$edit['langcode']])) {
        $isocodes = _locale_get_iso639_list();
        _locale_add_language($edit['langcode'], $isocodes[$edit['langcode']][0], FALSE);
      }
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      // Now import strings into the language
      $file = file_check_upload('file');
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      if ($ret = _locale_import_po($file, $edit['langcode'], $edit['mode']) == FALSE) {
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        $message = t('The translation import of %filename failed.', array('%filename' => theme('placeholder', $file->filename)));
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        drupal_set_message($message, 'error');
        watchdog('locale', $message, WATCHDOG_ERROR);
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      }
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      drupal_goto('admin/locale');
      break;
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  }
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  return _locale_admin_import_screen();
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}
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// ---------------------------------------------------------------------------------
// Gettext Portable Object export functionality (administration only)
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/**
 * Page handler for the translation export screen
 */
function locale_admin_export() {
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  include_once './includes/locale.inc';
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  switch ($_POST['op']) {
    case t('Export'):
      _locale_export_po($_POST['edit']['langcode']);
      break;
  }
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  return _locale_admin_export_screen();
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}

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// ---------------------------------------------------------------------------------
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// String search and editing functionality (administration only)
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/**
 * Page handler for the string search and administration screen
 */
function locale_admin_string() {
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  include_once './includes/locale.inc';
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  $op = ($_POST['op'] ? $_POST['op'] : arg(3));
  $edit =& $_POST['edit'];
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  switch ($op) {
    case 'delete':
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      $output .= _locale_string_delete(db_escape_string(arg(4)));
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      $output .= _locale_string_seek();
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      break;
    case 'edit':
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      $output .= _locale_string_edit(db_escape_string(arg(4)));
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      $output .= _locale_string_seek();
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      break;
    case t('Search'):
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    case 'search':
      $output = _locale_string_seek();
      $output .= _locale_string_seek_form();
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      break;
    case t('Save translations'):
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      $output .= _locale_string_save(db_escape_string(arg(4)));
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      drupal_goto('admin/locale/string/search');
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      break;
    default:
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  }
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  return $output;
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}

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