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<?php

/**

 * @file

 * Administration functions for locale.module.

 */

/**

 * The language is determined using a URL language indicator:

 * path prefix or domain according to the configuration.

 */

define('LOCALE_LANGUAGE_NEGOTIATION_URL', 'locale-url');

/**

 * The language is set based on the browser language settings.

 */

define('LOCALE_LANGUAGE_NEGOTIATION_BROWSER', 'locale-browser');

/**

 * The language is determined using the current interface language.

 */

define('LOCALE_LANGUAGE_NEGOTIATION_INTERFACE', 'locale-interface');

/**

 * If no URL language is available language is determined using an already

 * detected one.

 */

define('LOCALE_LANGUAGE_NEGOTIATION_URL_FALLBACK', 'locale-url-fallback');

/**

 * The language is set based on the user language settings.

 */

define('LOCALE_LANGUAGE_NEGOTIATION_USER', 'locale-user');

/**

 * The language is set based on the request/session parameters.

 */

define('LOCALE_LANGUAGE_NEGOTIATION_SESSION', 'locale-session');

/**

 * Regular expression pattern used to localize JavaScript strings.

 */

define('LOCALE_JS_STRING', '(?:(?:\'(?:\\\\\'|[^\'])*\'|"(?:\\\\"|[^"])*")(?:\s*\+\s*)?)+');

/**

 * Regular expression pattern used to match simple JS object literal.

 *

 * This pattern matches a basic JS object, but will fail on an object with

 * nested objects. Used in JS file parsing for string arg processing.

 */

define('LOCALE_JS_OBJECT', '\{.*?\}');

/**

 * Regular expression to match an object containing a key 'context'.

 *

 * Pattern to match a JS object containing a 'context key' with a string value,

 * which is captured. Will fail if there are nested objects.

 */

define('LOCALE_JS_OBJECT_CONTEXT', '

  \{              # match object literal start

  .*?             # match anything, non-greedy

  (?:             # match a form of "context"

    \'context\'

    |

    "context"

    |

    context

  )

  \s*:\s*         # match key-value separator ":"

  (' . LOCALE_JS_STRING . ')  # match context string

  .*?             # match anything, non-greedy

  \}              # match end of object literal

');

/**

 * Translation import mode overwriting all existing translations

 * if new translated version available.

 */

define('LOCALE_IMPORT_OVERWRITE', 0);

/**

 * Translation import mode keeping existing translations and only

 * inserting new strings.

 */

define('LOCALE_IMPORT_KEEP', 1);

/**

 * URL language negotiation: use the path prefix as URL language

 * indicator.

 */

define('LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX', 0);

/**

 * URL language negotiation: use the domain as URL language

 * indicator.

 */

define('LOCALE_LANGUAGE_NEGOTIATION_URL_DOMAIN', 1);

/**

 * @defgroup locale-languages-negotiation Language negotiation options

 * @{

 * Functions for language negotiation.

 *

 * There are functions that provide the ability to identify the

 * language. This behavior can be controlled by various options.

 */

/**

 * Identifies the language from the current interface language.

 *

 * @return

 *   The current interface language code.

 */

function locale_language_from_interface() {

  global $language;

  return isset($language->language) ? $language->language : FALSE;

}

/**

 * Identify language from the Accept-language HTTP header we got.

 *

 * We perform browser accept-language parsing only if page cache is disabled,

 * otherwise we would cache a user-specific preference.

 *

 * @param $languages

 *   An array of language objects for enabled languages ordered by weight.

 *

 * @return

 *   A valid language code on success, FALSE otherwise.

 */

function locale_language_from_browser($languages) {

  if (empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {

    return FALSE;

  }

  // The Accept-Language header contains information about the language

  // preferences configured in the user's browser / operating system.

  // RFC 2616 (section 14.4) defines the Accept-Language header as follows:

  //   Accept-Language = "Accept-Language" ":"

  //                  1#( language-range [ ";" "q" "=" qvalue ] )

  //   language-range  = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" )

  // Samples: "hu, en-us;q=0.66, en;q=0.33", "hu,en-us;q=0.5"

  $browser_langcodes = array();

  if (preg_match_all('@(?<=[, ]|^)([a-zA-Z-]+|\*)(?:;q=([0-9.]+))?(?:$|\s*,\s*)@', trim($_SERVER['HTTP_ACCEPT_LANGUAGE']), $matches, PREG_SET_ORDER)) {

    foreach ($matches as $match) {

      // We can safely use strtolower() here, tags are ASCII.

      // RFC2616 mandates that the decimal part is no more than three digits,

      // so we multiply the qvalue by 1000 to avoid floating point comparisons.

      $langcode = strtolower($match[1]);

      $qvalue = isset($match[2]) ? (float) $match[2] : 1;

      $browser_langcodes[$langcode] = (int) ($qvalue * 1000);

    }

  }

  // We should take pristine values from the HTTP headers, but Internet Explorer

  // from version 7 sends only specific language tags (eg. fr-CA) without the

  // corresponding generic tag (fr) unless explicitly configured. In that case,

  // we assume that the lowest value of the specific tags is the value of the

  // generic language to be as close to the HTTP 1.1 spec as possible.

  // See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4 and

  // http://blogs.msdn.com/b/ie/archive/2006/10/17/accept-language-header-for-internet-explorer-7.aspx

  asort($browser_langcodes);

  foreach ($browser_langcodes as $langcode => $qvalue) {

    $generic_tag = strtok($langcode, '-');

    if (!isset($browser_langcodes[$generic_tag])) {

      $browser_langcodes[$generic_tag] = $qvalue;

    }

  }

  // Find the enabled language with the greatest qvalue, following the rules

  // of RFC 2616 (section 14.4). If several languages have the same qvalue,

  // prefer the one with the greatest weight.

  $best_match_langcode = FALSE;

  $max_qvalue = 0;

  foreach ($languages as $langcode => $language) {

    // Language tags are case insensitive (RFC2616, sec 3.10).

    $langcode = strtolower($langcode);

    // If nothing matches below, the default qvalue is the one of the wildcard

    // language, if set, or is 0 (which will never match).

    $qvalue = isset($browser_langcodes['*']) ? $browser_langcodes['*'] : 0;

    // Find the longest possible prefix of the browser-supplied language

    // ('the language-range') that matches this site language ('the language tag').

    $prefix = $langcode;

    do {

      if (isset($browser_langcodes[$prefix])) {

        $qvalue = $browser_langcodes[$prefix];

        break;

      }

    }

    while ($prefix = substr($prefix, 0, strrpos($prefix, '-')));

    // Find the best match.

    if ($qvalue > $max_qvalue) {

      $best_match_langcode = $language->language;

      $max_qvalue = $qvalue;

    }

  }

  return $best_match_langcode;

}

/**

 * Identify language from the user preferences.

 *

 * @param $languages

 *   An array of valid language objects.

 *

 * @return

 *   A valid language code on success, FALSE otherwise.

 */

function locale_language_from_user($languages) {

  // User preference (only for logged users).

  global $user;

  if ($user->uid) {

    return $user->language;

  }

  // No language preference from the user.

  return FALSE;

}

/**

 * Identify language from a request/session parameter.

 *

 * @param $languages

 *   An array of valid language objects.

 *

 * @return

 *   A valid language code on success, FALSE otherwise.

 */

function locale_language_from_session($languages) {

  $param = variable_get('locale_language_negotiation_session_param', 'language');

  // Request parameter: we need to update the session parameter only if we have

  // an authenticated user.

  if (isset($_GET[$param]) && isset($languages[$langcode = $_GET[$param]])) {

    global $user;

    if ($user->uid) {

      $_SESSION[$param] = $langcode;

    }

    return $langcode;

  }

  // Session parameter.

  if (isset($_SESSION[$param])) {

    return $_SESSION[$param];

  }

  return FALSE;

}

/**

 * Identify language via URL prefix or domain.

 *

 * @param $languages

 *   An array of valid language objects.

 *

 * @return

 *   A valid language code on success, FALSE otherwise.

 */

function locale_language_from_url($languages) {

  $language_url = FALSE;

  if (!language_negotiation_get_any(LOCALE_LANGUAGE_NEGOTIATION_URL)) {

    return $language_url;

  }

  switch (variable_get('locale_language_negotiation_url_part', LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX)) {

    case LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX:

      // $_GET['q'] might not be available at this time, because

      // path initialization runs after the language bootstrap phase.

      list($language, $_GET['q']) = language_url_split_prefix(isset($_GET['q']) ? $_GET['q'] : NULL, $languages);

      if ($language !== FALSE) {

        $language_url = $language->language;

      }

      break;

    case LOCALE_LANGUAGE_NEGOTIATION_URL_DOMAIN:

      // Get only the host, not the port.

      $http_host= $_SERVER['HTTP_HOST'];

      if (strpos($http_host, ':') !== FALSE) {

        $http_host_tmp = explode(':', $http_host);

        $http_host = current($http_host_tmp);

      }

      foreach ($languages as $language) {

        // Skip check if the language doesn't have a domain.

        if ($language->domain) {

          // Only compare the domains not the protocols or ports.

          // Remove protocol and add http:// so parse_url works

          $host = 'http://' . str_replace(array('http://', 'https://'), '', $language->domain);

          $host = parse_url($host, PHP_URL_HOST);

          if ($http_host == $host) {

            $language_url = $language->language;

            break;

          }

        }

      }

      break;

  }

  return $language_url;

}

/**

 * Determines the language to be assigned to URLs when none is detected.

 *

 * The language negotiation process has a fallback chain that ends with the

 * default language provider. Each built-in language type has a separate

 * initialization:

 * - Interface language, which is the only configurable one, always gets a valid

 *   value. If no request-specific language is detected, the default language

 *   will be used.

 * - Content language merely inherits the interface language by default.

 * - URL language is detected from the requested URL and will be used to rewrite

 *   URLs appearing in the page being rendered. If no language can be detected,

 *   there are two possibilities:

 *   - If the default language has no configured path prefix or domain, then the

 *     default language is used. This guarantees that (missing) URL prefixes are

 *     preserved when navigating through the site.

 *   - If the default language has a configured path prefix or domain, a

 *     requested URL having an empty prefix or domain is an anomaly that must be

 *     fixed. This is done by introducing a prefix or domain in the rendered

 *     page matching the detected interface language.

 *

 * @param $languages

 *   (optional) An array of valid language objects. This is passed by

 *   language_provider_invoke() to every language provider callback, but it is

 *   not actually needed here. Defaults to NULL.

 * @param $language_type

 *   (optional) The language type to fall back to. Defaults to the interface

 *   language.

 *

 * @return

 *   A valid language code.

 */

function locale_language_url_fallback($language = NULL, $language_type = LANGUAGE_TYPE_INTERFACE) {

  $default = language_default();

  $prefix = (variable_get('locale_language_negotiation_url_part', LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX) == LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX);

  // If the default language is not configured to convey language information,

  // a missing URL language information indicates that URL language should be

  // the default one, otherwise we fall back to an already detected language.

  if (($prefix && empty($default->prefix)) || (!$prefix && empty($default->domain))) {

    return $default->language;

  }

  else {

    return $GLOBALS[$language_type]->language;

  }

}

/**

 * Return the URL language switcher block. Translation links may be provided by

 * other modules.

 */

function locale_language_switcher_url($type, $path) {

  $languages = language_list('enabled');

  $links = array();

  foreach ($languages[1] as $language) {

    $links[$language->language] = array(

      'href'       => $path,

      'title'      => $language->native,

      'language'   => $language,

      'attributes' => array('class' => array('language-link')),

    );

  }

  return $links;

}

/**

 * Return the session language switcher block.

 */

function locale_language_switcher_session($type, $path) {

  drupal_add_css(drupal_get_path('module', 'locale') . '/locale.css');

  $param = variable_get('locale_language_negotiation_session_param', 'language');

  $language_query = isset($_SESSION[$param]) ? $_SESSION[$param] : $GLOBALS[$type]->language;

  $languages = language_list('enabled');

  $links = array();

  $query = $_GET;

  unset($query['q']);

  foreach ($languages[1] as $language) {

    $langcode = $language->language;

    $links[$langcode] = array(

      'href'       => $path,

      'title'      => $language->native,

      'attributes' => array('class' => array('language-link')),

      'query'      => $query,

    );

    if ($language_query != $langcode) {

      $links[$langcode]['query'][$param] = $langcode;

    }

    else {

      $links[$langcode]['attributes']['class'][] = 'session-active';

    }

  }

  return $links;

}

/**

 * Rewrite URLs for the URL language provider.

 */

function locale_language_url_rewrite_url(&$path, &$options) {

  static $drupal_static_fast;

  if (!isset($drupal_static_fast)) {

    $drupal_static_fast['languages'] = &drupal_static(__FUNCTION__);

  }

  $languages = &$drupal_static_fast['languages'];

  if (!isset($languages)) {

    $languages = language_list('enabled');

    $languages = array_flip(array_keys($languages[1]));

  }

  // Language can be passed as an option, or we go for current URL language.

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

    global $language_url;

    $options['language'] = $language_url;

  }

  // We allow only enabled languages here.

  elseif (!isset($languages[$options['language']->language])) {

    unset($options['language']);

    return;

  }

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

    switch (variable_get('locale_language_negotiation_url_part', LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX)) {

      case LOCALE_LANGUAGE_NEGOTIATION_URL_DOMAIN:

        if ($options['language']->domain) {

          // Ask for an absolute URL with our modified base_url.

          global $is_https;

          $url_scheme = ($is_https) ? 'https://' : 'http://';

          $options['absolute'] = TRUE;

          // Take the domain without ports or protocols so we can apply the

          // protocol needed. The setting might include a protocol.

          // This is changed in Drupal 8 but we need to keep backwards

          // compatibility for Drupal 7.

          $host = 'http://' . str_replace(array('http://', 'https://'), '', $options['language']->domain);

          $host = parse_url($host, PHP_URL_HOST);

          // Apply the appropriate protocol to the URL.

          $options['base_url'] = $url_scheme . $host;

          if (isset($options['https']) && variable_get('https', FALSE)) {

            if ($options['https'] === TRUE) {

              $options['base_url'] = str_replace('http://', 'https://', $options['base_url']);

            }

            elseif ($options['https'] === FALSE) {

              $options['base_url'] = str_replace('https://', 'http://', $options['base_url']);

            }

          }

        }

        break;

      case LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX:

        if (!empty($options['language']->prefix)) {

          $options['prefix'] = $options['language']->prefix . '/';

        }

        break;

    }

  }

}

/**

 * Rewrite URLs for the Session language provider.

 */

function locale_language_url_rewrite_session(&$path, &$options) {

  static $query_rewrite, $query_param, $query_value;

  // The following values are not supposed to change during a single page

  // request processing.

  if (!isset($query_rewrite)) {

    global $user;

    if (!$user->uid) {

      $languages = language_list('enabled');

      $languages = $languages[1];

      $query_param = check_plain(variable_get('locale_language_negotiation_session_param', 'language'));

      $query_value = isset($_GET[$query_param]) ? check_plain($_GET[$query_param]) : NULL;

      $query_rewrite = isset($languages[$query_value]) && language_negotiation_get_any(LOCALE_LANGUAGE_NEGOTIATION_SESSION);

    }

    else {

      $query_rewrite = FALSE;

    }

  }

  // If the user is anonymous, the user language provider is enabled, and the

  // corresponding option has been set, we must preserve any explicit user

  // language preference even with cookies disabled.

  if ($query_rewrite) {

    if (is_string($options['query'])) {

      $options['query'] = drupal_get_query_array($options['query']);

    }

    if (!isset($options['query'][$query_param])) {

      $options['query'][$query_param] = $query_value;

    }

  }

}

/**

 * @} End of "locale-languages-negotiation"

 */

/**

 * Check that a string is safe to be added or imported as a translation.

 *

 * This test can be used to detect possibly bad translation strings. It should

 * not have any false positives. But it is only a test, not a transformation,

 * as it destroys valid HTML. We cannot reliably filter translation strings

 * on import because some strings are irreversibly corrupted. For example,

 * a & in the translation would get encoded to & by filter_xss()

 * before being put in the database, and thus would be displayed incorrectly.

 *

 * The allowed tag list is like filter_xss_admin(), but omitting div and img as

 * not needed for translation and likely to cause layout issues (div) or a

 * possible attack vector (img).

 */

function locale_string_is_safe($string) {

  return decode_entities($string) == decode_entities(filter_xss($string, array('a', 'abbr', 'acronym', 'address', 'b', 'bdo', 'big', 'blockquote', 'br', 'caption', 'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dl', 'dt', 'em', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'ins', 'kbd', 'li', 'ol', 'p', 'pre', 'q', 'samp', 'small', 'span', 'strong', 'sub', 'sup', 'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'tr', 'tt', 'ul', 'var')));

}

/**

 * @defgroup locale-api-add Language addition API

 * @{

 * Add a language.

 *

 * The language addition API is used to create languages and store them.

 */

/**

 * API function to add a language.

 *

 * @param $langcode

 *   Language code.

 * @param $name

 *   English name of the language

 * @param $native

 *   Native name of the language

 * @param $direction

 *   LANGUAGE_LTR or LANGUAGE_RTL

 * @param $domain

 *   Optional custom domain name with protocol, without

 *   trailing slash (eg. http://de.example.com).

 * @param $prefix

 *   Optional path prefix for the language. Defaults to the

 *   language code if omitted.

 * @param $enabled

 *   Optionally TRUE to enable the language when created or FALSE to disable.

 * @param $default

 *   Optionally set this language to be the default.

 */

function locale_add_language($langcode, $name = NULL, $native = NULL, $direction = LANGUAGE_LTR, $domain = '', $prefix = '', $enabled = TRUE, $default = FALSE) {

  // Default prefix on language code.

  if (empty($prefix)) {

    $prefix = $langcode;

  }

  // If name was not set, we add a predefined language.

  if (!isset($name)) {

    include_once DRUPAL_ROOT . '/includes/iso.inc';

    $predefined = _locale_get_predefined_list();

    $name = $predefined[$langcode][0];

    $native = isset($predefined[$langcode][1]) ? $predefined[$langcode][1] : $predefined[$langcode][0];

    $direction = isset($predefined[$langcode][2]) ? $predefined[$langcode][2] : LANGUAGE_LTR;

  }

  db_insert('languages')

    ->fields(array(

      'language' => $langcode,

      'name' => $name,

      'native' => $native,

      'direction' => $direction,

      'domain' => $domain,

      'prefix' => $prefix,

      'enabled' => $enabled,

    ))

    ->execute();

  // Only set it as default if enabled.

  if ($enabled && $default) {

    variable_set('language_default', (object) array('language' => $langcode, 'name' => $name, 'native' => $native, 'direction' => $direction, 'enabled' => (int) $enabled, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => $prefix, 'weight' => 0, 'javascript' => ''));

  }

  if ($enabled) {

    // Increment enabled language count if we are adding an enabled language.

    variable_set('language_count', variable_get('language_count', 1) + 1);

  }

  // Kill the static cache in language_list().

  drupal_static_reset('language_list');

  // Force JavaScript translation file creation for the newly added language.

  _locale_invalidate_js($langcode);

  watchdog('locale', 'The %language language (%code) has been created.', array('%language' => $name, '%code' => $langcode));

  module_invoke_all('multilingual_settings_changed');

}

/**

 * @} End of "locale-api-add"

 */

/**

 * @defgroup locale-api-import-export Translation import/export API.

 * @{

 * Functions to import and export translations.

 *

 * These functions provide the ability to import translations from

 * external files and to export translations and translation templates.

 */

/**

 * Parses Gettext Portable Object file information and inserts into database

 *

 * @param $file

 *   Drupal file object corresponding to the PO file to import.

 * @param $langcode

 *   Language code.

 * @param $mode

 *   Should existing translations be replaced LOCALE_IMPORT_KEEP or

 *   LOCALE_IMPORT_OVERWRITE.

 * @param $group

 *   Text group to import PO file into (eg. 'default' for interface

 *   translations).

 */

function _locale_import_po($file, $langcode, $mode, $group = NULL) {

  // Try to allocate enough time to parse and import the data.

  drupal_set_time_limit(240);

  // Check if we have the language already in the database.

  if (!db_query("SELECT COUNT(language) FROM {languages} WHERE language = :language", array(':language' => $langcode))->fetchField()) {

    drupal_set_message(t('The language selected for import is not supported.'), 'error');

    return FALSE;

  }

  // Get strings from file (returns on failure after a partial import, or on success)

  $status = _locale_import_read_po('db-store', $file, $mode, $langcode, $group);

  if ($status === FALSE) {

    // Error messages are set in _locale_import_read_po().

    return FALSE;

  }

  // Get status information on import process.

  list($header_done, $additions, $updates, $deletes, $skips) = _locale_import_one_string('db-report');

  if (!$header_done) {

    drupal_set_message(t('The translation file %filename appears to have a missing or malformed header.', array('%filename' => $file->filename)), 'error');

  }

  // Clear cache and force refresh of JavaScript translations.

  _locale_invalidate_js($langcode);

  cache_clear_all('locale:', 'cache', TRUE);

  // Rebuild the menu, strings may have changed.

  menu_rebuild();

  drupal_set_message(t('The translation was successfully imported. There are %number newly created translated strings, %update strings were updated and %delete strings were removed.', array('%number' => $additions, '%update' => $updates, '%delete' => $deletes)));

  watchdog('locale', 'Imported %file into %locale: %number new strings added, %update updated and %delete removed.', array('%file' => $file->filename, '%locale' => $langcode, '%number' => $additions, '%update' => $updates, '%delete' => $deletes));

  if ($skips) {

    $skip_message = format_plural($skips, 'One translation string was skipped because it contains disallowed HTML.', '@count translation strings were skipped because they contain disallowed HTML.');

    drupal_set_message($skip_message);

    watchdog('locale', '@count disallowed HTML string(s) in %file', array('@count' => $skips, '%file' => $file->uri), WATCHDOG_WARNING);

  }

  return TRUE;

}

/**

 * Parses Gettext Portable Object file into an array

 *

 * @param $op

 *   Storage operation type: db-store or mem-store.

 * @param $file

 *   Drupal file object corresponding to the PO file to import.

 * @param $mode

 *   Should existing translations be replaced LOCALE_IMPORT_KEEP or

 *   LOCALE_IMPORT_OVERWRITE.

 * @param $lang

 *   Language code.

 * @param $group

 *   Text group to import PO file into (eg. 'default' for interface

 *   translations).

 */

function _locale_import_read_po($op, $file, $mode = NULL, $lang = NULL, $group = 'default') {

  // The file will get closed by PHP on returning from this function.

  $fd = fopen($file->uri, 'rb');

  if (!$fd) {

    _locale_import_message('The translation import failed, because the file %filename could not be read.', $file);

    return FALSE;

  }

  /*

   * The parser context. Can be:

   *  - 'COMMENT' (#)

   *  - 'MSGID' (msgid)

   *  - 'MSGID_PLURAL' (msgid_plural)

   *  - 'MSGCTXT' (msgctxt)

   *  - 'MSGSTR' (msgstr or msgstr[])

   *  - 'MSGSTR_ARR' (msgstr_arg)

   */

  $context = 'COMMENT';

  // Current entry being read.

  $current = array();

  // Current plurality for 'msgstr[]'.

  $plural = 0;

  // Current line.

  $lineno = 0;

  while (!feof($fd)) {

    // A line should not be longer than 10 * 1024.

    $line = fgets($fd, 10 * 1024);

    if ($lineno == 0) {

      // The first line might come with a UTF-8 BOM, which should be removed.

      $line = str_replace("\xEF\xBB\xBF", '', $line);

    }

    $lineno++;

    // Trim away the linefeed.

    $line = trim(strtr($line, array("\\\n" => "")));

    if (!strncmp('#', $line, 1)) {

      // Lines starting with '#' are comments.

      if ($context == 'COMMENT') {

        // Already in comment token, insert the comment.

        $current['#'][] = substr($line, 1);

      }

      elseif (($context == 'MSGSTR') || ($context == 'MSGSTR_ARR')) {

        // We are currently in string token, close it out.

        _locale_import_one_string($op, $current, $mode, $lang, $file, $group);

        // Start a new entry for the comment.

        $current         = array();

        $current['#'][]  = substr($line, 1);

        $context = 'COMMENT';

      }

      else {

        // A comment following any other token is a syntax error.

        _locale_import_message('The translation file %filename contains an error: "msgstr" was expected but not found on line %line.', $file, $lineno);

        return FALSE;

      }

    }

    elseif (!strncmp('msgid_plural', $line, 12)) {

      // A plural form for the current message.

      if ($context != 'MSGID') {

        // A plural form cannot be added to anything else but the id directly.

        _locale_import_message('The translation file %filename contains an error: "msgid_plural" was expected but not found on line %line.', $file, $lineno);

        return FALSE;

      }

      // Remove 'msgid_plural' and trim away whitespace.

      $line = trim(substr($line, 12));

      // At this point, $line should now contain only the plural form.

      $quoted = _locale_import_parse_quoted($line);

      if ($quoted === FALSE) {

        // The plural form must be wrapped in quotes.

        _locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);

        return FALSE;

      }

      // Append the plural form to the current entry.

      $current['msgid'] .= "\0" . $quoted;

      $context = 'MSGID_PLURAL';

    }

    elseif (!strncmp('msgid', $line, 5)) {

      // Starting a new message.

      if (($context == 'MSGSTR') || ($context == 'MSGSTR_ARR')) {

        // We are currently in a message string, close it out.

        _locale_import_one_string($op, $current, $mode, $lang, $file, $group);

        // Start a new context for the id.

        $current = array();

      }

      elseif ($context == 'MSGID') {

        // We are currently already in the context, meaning we passed an id with no data.

        _locale_import_message('The translation file %filename contains an error: "msgid" is unexpected on line %line.', $file, $lineno);

        return FALSE;

      }

      // Remove 'msgid' and trim away whitespace.

      $line = trim(substr($line, 5));

      // At this point, $line should now contain only the message id.

      $quoted = _locale_import_parse_quoted($line);

      if ($quoted === FALSE) {

        // The message id must be wrapped in quotes.

        _locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);

        return FALSE;

      }

      $current['msgid'] = $quoted;

      $context = 'MSGID';

    }

    elseif (!strncmp('msgctxt', $line, 7)) {

      // Starting a new context.

      if (($context == 'MSGSTR') || ($context == 'MSGSTR_ARR')) {

        // We are currently in a message, start a new one.

        _locale_import_one_string($op, $current, $mode, $lang, $file, $group);

        $current = array();

      }

      elseif (!empty($current['msgctxt'])) {

        // A context cannot apply to another context.

        _locale_import_message('The translation file %filename contains an error: "msgctxt" is unexpected on line %line.', $file, $lineno);

        return FALSE;

      }

      // Remove 'msgctxt' and trim away whitespaces.

      $line = trim(substr($line, 7));

      // At this point, $line should now contain the context.

      $quoted = _locale_import_parse_quoted($line);

      if ($quoted === FALSE) {

        // The context string must be quoted.

        _locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);

        return FALSE;

      }

      $current['msgctxt'] = $quoted;

      $context = 'MSGCTXT';

    }

    elseif (!strncmp('msgstr[', $line, 7)) {

      // A message string for a specific plurality.

      if (($context != 'MSGID') && ($context != 'MSGCTXT') && ($context != 'MSGID_PLURAL') && ($context != 'MSGSTR_ARR')) {

        // Message strings must come after msgid, msgxtxt, msgid_plural, or other msgstr[] entries.

        _locale_import_message('The translation file %filename contains an error: "msgstr[]" is unexpected on line %line.', $file, $lineno);

        return FALSE;

      }

      // Ensure the plurality is terminated.

      if (strpos($line, ']') === FALSE) {

        _locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);

        return FALSE;

      }

      // Extract the plurality.

      $frombracket = strstr($line, '[');

      $plural = substr($frombracket, 1, strpos($frombracket, ']') - 1);

      // Skip to the next whitespace and trim away any further whitespace, bringing $line to the message data.

      $line = trim(strstr($line, " "));

      $quoted = _locale_import_parse_quoted($line);

      if ($quoted === FALSE) {

        // The string must be quoted.

        _locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);

        return FALSE;

      }

      $current['msgstr'][$plural] = $quoted;

      $context = 'MSGSTR_ARR';

    }

    elseif (!strncmp("msgstr", $line, 6)) {

      // A string for the an id or context.

      if (($context != 'MSGID') && ($context != 'MSGCTXT')) {

        // Strings are only valid within an id or context scope.

        _locale_import_message('The translation file %filename contains an error: "msgstr" is unexpected on line %line.', $file, $lineno);

        return FALSE;

      }

      // Remove 'msgstr' and trim away away whitespaces.

      $line = trim(substr($line, 6));

      // At this point, $line should now contain the message.

      $quoted = _locale_import_parse_quoted($line);

      if ($quoted === FALSE) {

        // The string must be quoted.

        _locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);

        return FALSE;

      }

      $current['msgstr'] = $quoted;

      $context = 'MSGSTR';

    }

    elseif ($line != '') {

      // Anything that is not a token may be a continuation of a previous token.

      $quoted = _locale_import_parse_quoted($line);

      if ($quoted === FALSE) {

        // The string must be quoted.

        _locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);

        return FALSE;

      }

      // Append the string to the current context.

      if (($context == 'MSGID') || ($context == 'MSGID_PLURAL')) {

        $current['msgid'] .= $quoted;

      }

      elseif ($context == 'MSGCTXT') {

        $current['msgctxt'] .= $quoted;

      }

      elseif ($context == 'MSGSTR') {

        $current['msgstr'] .= $quoted;

      }

      elseif ($context == 'MSGSTR_ARR') {

        $current['msgstr'][$plural] .= $quoted;

      }

      else {

        // No valid context to append to.

        _locale_import_message('The translation file %filename contains an error: there is an unexpected string on line %line.', $file, $lineno);

        return FALSE;

      }

    }

  }

  // End of PO file, closed out the last entry.

  if (($context == 'MSGSTR') || ($context == 'MSGSTR_ARR')) {

    _locale_import_one_string($op, $current, $mode, $lang, $file, $group);

  }

  elseif ($context != 'COMMENT') {

    _locale_import_message('The translation file %filename ended unexpectedly at line %line.', $file, $lineno);

    return FALSE;

  }

}

/**

 * Sets an error message occurred during locale file parsing.

 *

 * @param $message

 *   The message to be translated.

 * @param $file

 *   Drupal file object corresponding to the PO file to import.

 * @param $lineno

 *   An optional line number argument.

 */

function _locale_import_message($message, $file, $lineno = NULL) {

  $vars = array('%filename' => $file->filename);

  if (isset($lineno)) {

    $vars['%line'] = $lineno;

  }

  $t = get_t();

  drupal_set_message($t($message, $vars), 'error');

}

/**

 * Imports a string into the database

 *

 * @param $op

 *   Operation to perform: 'db-store', 'db-report', 'mem-store' or 'mem-report'.

 * @param $value

 *   Details of the string stored.

 * @param $mode

 *   Should existing translations be replaced LOCALE_IMPORT_KEEP or

 *   LOCALE_IMPORT_OVERWRITE.

 * @param $lang

 *   Language to store the string in.

 * @param $file

 *   Object representation of file being imported, only required when op is

 *   'db-store'.

 * @param $group

 *   Text group to import PO file into (eg. 'default' for interface

 *   translations).

 */

function _locale_import_one_string($op, $value = NULL, $mode = NULL, $lang = NULL, $file = NULL, $group = 'default') {

  $report = &drupal_static(__FUNCTION__, array('additions' => 0, 'updates' => 0, 'deletes' => 0, 'skips' => 0));

  $header_done = &drupal_static(__FUNCTION__ . ':header_done', FALSE);

  $strings = &drupal_static(__FUNCTION__ . ':strings', array());

  switch ($op) {

    // Return stored strings

    case 'mem-report':

      return $strings;

    // Store string in memory (only supports single strings)

    case 'mem-store':

      $strings[isset($value['msgctxt']) ? $value['msgctxt'] : ''][$value['msgid']] = $value['msgstr'];

      return;

    // Called at end of import to inform the user

    case 'db-report':

      return array($header_done, $report['additions'], $report['updates'], $report['deletes'], $report['skips']);

    // Store the string we got in the database.

    case 'db-store':

      // We got header information.

      if ($value['msgid'] == '') {

        $languages = language_list();

        if (($mode != LOCALE_IMPORT_KEEP) || empty($languages[$lang]->plurals)) {

          // Since we only need to parse the header if we ought to update the

          // plural formula, only run this if we don't need to keep existing

          // data untouched or if we don't have an existing plural formula.

          $header = _locale_import_parse_header($value['msgstr']);

          // Get and store the plural formula if available.

          if (isset($header["Plural-Forms"]) && $p = _locale_import_parse_plural_forms($header["Plural-Forms"], $file->uri)) {

            list($nplurals, $plural) = $p;

            db_update('languages')

              ->fields(array(

                'plurals' => $nplurals,

                'formula' => $plural,

              ))

              ->condition('language', $lang)

              ->execute();

          }

        }

        $header_done = TRUE;

      }

      else {

        // Some real string to import.

        $comments = _locale_import_shorten_comments(empty($value['#']) ? array() : $value['#']);

        if (strpos($value['msgid'], "\0")) {

          // This string has plural versions.

          $english = explode("\0", $value['msgid'], 2);

          $entries = array_keys($value['msgstr']);

          for ($i = 3; $i <= count($entries); $i++) {

            $english[] = $english[1];

          }

          $translation = array_map('_locale_import_append_plural', $value['msgstr'], $entries);

          $english = array_map('_locale_import_append_plural', $english, $entries);

          foreach ($translation as $key => $trans) {

            if ($key == 0) {

              $plid = 0;

            }

            $plid = _locale_import_one_string_db($report, $lang, isset($value['msgctxt']) ? $value['msgctxt'] : '', $english[$key], $trans, $group, $comments, $mode, $plid, $key);

          }

        }

        else {

          // A simple string to import.

          $english = $value['msgid'];

          $translation = $value['msgstr'];

          _locale_import_one_string_db($report, $lang, isset($value['msgctxt']) ? $value['msgctxt'] : '', $english, $translation, $group, $comments, $mode);

        }

      }

  } // end of db-store operation

}

/**

 * Import one string into the database.

 *

 * @param $report

 *   Report array summarizing the number of changes done in the form:

 *   array(inserts, updates, deletes).

 * @param $langcode

 *   Language code to import string into.

 * @param $context

 *   The context of this string.

 * @param $source

 *   Source string.

 * @param $translation

 *   Translation to language specified in $langcode.

 * @param $textgroup

 *   Name of textgroup to store translation in.

 * @param $location

 *   Location value to save with source string.

 * @param $mode

 *   Import mode to use, LOCALE_IMPORT_KEEP or LOCALE_IMPORT_OVERWRITE.

 * @param $plid

 *   Optional plural ID to use.

 * @param $plural

 *   Optional plural value to use.

 *

 * @return

 *   The string ID of the existing string modified or the new string added.

 */

function _locale_import_one_string_db(&$report, $langcode, $context, $source, $translation, $textgroup, $location, $mode, $plid = 0, $plural = 0) {

  $lid = db_query("SELECT lid FROM {locales_source} WHERE source = :source AND context = :context AND textgroup = :textgroup", array(':source' => $source, ':context' => $context, ':textgroup' => $textgroup))->fetchField();

  if (!empty($translation)) {

    // Skip this string unless it passes a check for dangerous code.

    // Text groups other than default still can contain HTML tags

    // (i.e. translatable blocks).

    if ($textgroup == "default" && !locale_string_is_safe($translation)) {

      $report['skips']++;

      $lid = 0;

    }

    elseif ($lid) {

      // We have this source string saved already.

      db_update('locales_source')

        ->fields(array(

          'location' => $location,

        ))

        ->condition('lid', $lid)

        ->execute();

      $exists = db_query("SELECT COUNT(lid) FROM {locales_target} WHERE lid = :lid AND language = :language", array(':lid' => $lid, ':language' => $langcode))->fetchField();

      if (!$exists) {

        // No translation in this language.

        db_insert('locales_target')

          ->fields(array(

            'lid' => $lid,

            'language' => $langcode,

            'translation' => $translation,

            'plid' => $plid,

            'plural' => $plural,

          ))

          ->execute();

        $report['additions']++;

      }

      elseif ($mode == LOCALE_IMPORT_OVERWRITE) {

        // Translation exists, only overwrite if instructed.

        db_update('locales_target')

          ->fields(array(

            'translation' => $translation,

            'plid' => $plid,

            'plural' => $plural,

          ))

          ->condition('language', $langcode)

          ->condition('lid', $lid)

          ->execute();

        $report['updates']++;

      }

    }

    else {

      // No such source string in the database yet.

      $lid = db_insert('locales_source')

        ->fields(array(

          'location' => $location,

          'source' => $source,

          'context' => (string) $context,

          'textgroup' => $textgroup,

        ))

        ->execute();

      db_insert('locales_target')

        ->fields(array(

           'lid' => $lid,

           'language' => $langcode,

           'translation' => $translation,

           'plid' => $plid,

           'plural' => $plural

        ))

        ->execute();

      $report['additions']++;

    }

  }

  elseif ($mode == LOCALE_IMPORT_OVERWRITE) {

    // Empty translation, remove existing if instructed.

    db_delete('locales_target')

      ->condition('language', $langcode)

      ->condition('lid', $lid)

      ->condition('plid', $plid)

      ->condition('plural', $plural)

      ->execute();

    $report['deletes']++;

  }

  return $lid;

}

/**

 * Parses a Gettext Portable Object file header

 *

 * @param $header

 *   A string containing the complete header.

 *

 * @return

 *   An associative array of key-value pairs.

 */

function _locale_import_parse_header($header) {

  $header_parsed = array();

  $lines = array_map('trim', explode("\n", $header));

  foreach ($lines as $line) {

    if ($line) {

      list($tag, $contents) = explode(":", $line, 2);

      $header_parsed[trim($tag)] = trim($contents);

    }

  }

  return $header_parsed;

}

/**

 * Parses a Plural-Forms entry from a Gettext Portable Object file header

 *

 * @param $pluralforms

 *   A string containing the Plural-Forms entry.

 * @param $filepath

 *   A string containing the filepath.

 *

 * @return

 *   An array containing the number of plurals and a

 *   formula in PHP for computing the plural form.

 */

function _locale_import_parse_plural_forms($pluralforms, $filepath) {

  // First, delete all whitespace

  $pluralforms = strtr($pluralforms, array(" " => "", "\t" => ""));

  // Select the parts that define nplurals and plural

  $nplurals = strstr($pluralforms, "nplurals=");

  if (strpos($nplurals, ";")) {

    $nplurals = substr($nplurals, 9, strpos($nplurals, ";") - 9);

  }

  else {

    return FALSE;

  }

  $plural = strstr($pluralforms, "plural=");

  if (strpos($plural, ";")) {

    $plural = substr($plural, 7, strpos($plural, ";") - 7);

  }

  else {

    return FALSE;

  }

  // Get PHP version of the plural formula

  $plural = _locale_import_parse_arithmetic($plural);

  if ($plural !== FALSE) {

    return array($nplurals, $plural);

  }

  else {

    drupal_set_message(t('The translation file %filepath contains an error: the plural formula could not be parsed.', array('%filepath' => $filepath)), 'error');

    return FALSE;

  }

}

/**

 * Parses and sanitizes an arithmetic formula into a PHP expression

 *

 * While parsing, we ensure, that the operators have the right

 * precedence and associativity.

 *

 * @param $string

 *   A string containing the arithmetic formula.

 *

 * @return

 *   The PHP version of the formula.

 */

function _locale_import_parse_arithmetic($string) {

  // Operator precedence table

  $precedence = array("(" => -1, ")" => -1, "?" => 1, ":" => 1, "||" => 3, "&&" => 4, "==" => 5, "!=" => 5, "<" => 6, ">" => 6, "<=" => 6, ">=" => 6, "+" => 7, "-" => 7, "*" => 8, "/" => 8, "%" => 8);

  // Right associativity

  $right_associativity = array("?" => 1, ":" => 1);

  $tokens = _locale_import_tokenize_formula($string);

  // Parse by converting into infix notation then back into postfix

  // Operator stack - holds math operators and symbols

  $operator_stack = array();

  // Element Stack - holds data to be operated on

  $element_stack = array();

  foreach ($tokens as $token) {

    $current_token = $token;

    // Numbers and the $n variable are simply pushed into $element_stack

    if (is_numeric($token)) {

      $element_stack[] = $current_token;

    }

    elseif ($current_token == "n") {

      $element_stack[] = '$n';

    }

    elseif ($current_token == "(") {

      $operator_stack[] = $current_token;

    }

    elseif ($current_token == ")") {

      $topop = array_pop($operator_stack);

      while (isset($topop) && ($topop != "(")) {

        $element_stack[] = $topop;

        $topop = array_pop($operator_stack);

      }

    }

    elseif (!empty($precedence[$current_token])) {

      // If it's an operator, then pop from $operator_stack into $element_stack until the

      // precedence in $operator_stack is less than current, then push into $operator_stack

      $topop = array_pop($operator_stack);

      while (isset($topop) && ($precedence[$topop] >= $precedence[$current_token]) && !(($precedence[$topop] == $precedence[$current_token]) && !empty($right_associativity[$topop]) && !empty($right_associativity[$current_token]))) {

        $element_stack[] = $topop;

        $topop = array_pop($operator_stack);

      }

      if ($topop) {

        $operator_stack[] = $topop;   // Return element to top

      }

      $operator_stack[] = $current_token;      // Parentheses are not needed

    }

    else {

      return FALSE;

    }

  }

  // Flush operator stack

  $topop = array_pop($operator_stack);

  while ($topop != NULL) {

    $element_stack[] = $topop;

    $topop = array_pop($operator_stack);

  }

  // Now extract formula from stack

  $previous_size = count($element_stack) + 1;

  while (count($element_stack) < $previous_size) {

    $previous_size = count($element_stack);

    for ($i = 2; $i < count($element_stack); $i++) {

      $op = $element_stack[$i];

      if (!empty($precedence[$op])) {

        $f = "";

        if ($op == ":") {

          $f = $element_stack[$i - 2] . "):" . $element_stack[$i - 1] . ")";

        }

        elseif ($op == "?") {

          $f = "(" . $element_stack[$i - 2] . "?(" . $element_stack[$i - 1];

        }

        else {

          $f = "(" . $element_stack[$i - 2] . $op . $element_stack[$i - 1] . ")";

        }

        array_splice($element_stack, $i - 2, 3, $f);

        break;

      }

    }

  }

  // If only one element is left, the number of operators is appropriate

  if (count($element_stack) == 1) {

    return $element_stack[0];

  }

  else {

    return FALSE;

  }

}

/**

 * Backward compatible implementation of token_get_all() for formula parsing

 *

 * @param $string

 *   A string containing the arithmetic formula.

 *

 * @return

 *   The PHP version of the formula.

 */

function _locale_import_tokenize_formula($formula) {

  $formula = str_replace(" ", "", $formula);

  $tokens = array();

  for ($i = 0; $i < strlen($formula); $i++) {

    if (is_numeric($formula[$i])) {

      $num = $formula[$i];

      $j = $i + 1;

      while ($j < strlen($formula) && is_numeric($formula[$j])) {

        $num .= $formula[$j];

        $j++;

      }

      $i = $j - 1;

      $tokens[] = $num;

    }

    elseif ($pos = strpos(" =<>!&|", $formula[$i])) { // We won't have a space

      $next = $formula[$i + 1];

      switch ($pos) {

        case 1:

        case 2:

        case 3:

        case 4:

          if ($next == '=') {

            $tokens[] = $formula[$i] . '=';

            $i++;

          }

          else {

            $tokens[] = $formula[$i];

          }

          break;

        case 5:

          if ($next == '&') {

            $tokens[] = '&&';

            $i++;

          }

          else {

            $tokens[] = $formula[$i];

          }

          break;

        case 6:

          if ($next == '|') {

            $tokens[] = '||';

            $i++;

          }

          else {

            $tokens[] = $formula[$i];

          }

          break;

      }

    }

    else {

      $tokens[] = $formula[$i];

    }

  }

  return $tokens;

}

/**

 * Modify a string to contain proper count indices

 *

 * This is a callback function used via array_map()

 *

 * @param $entry

 *   An array element.

 * @param $key

 *   Index of the array element.

 */

function _locale_import_append_plural($entry, $key) {

  // No modifications for 0, 1

  if ($key == 0 || $key == 1) {

    return $entry;

  }

  // First remove any possibly false indices, then add new ones

  $entry = preg_replace('/(@count)\[[0-9]\]/', '\\1', $entry);

  return preg_replace('/(@count)/', "\\1[$key]", $entry);

}

/**

 * Generate a short, one string version of the passed comment array

 *

 * @param $comment

 *   An array of strings containing a comment.

 *

 * @return

 *   Short one string version of the comment.

 */

function _locale_import_shorten_comments($comment) {

  $comm = '';

  while (count($comment)) {

    $test = $comm . substr(array_shift($comment), 1) . ', ';

    if (strlen($comm) < 130) {

      $comm = $test;

    }

    else {

      break;

    }

  }

  return trim(substr($comm, 0, -2));

}

/**

 * Parses a string in quotes

 *

 * @param $string

 *   A string specified with enclosing quotes.

 *

 * @return

 *   The string parsed from inside the quotes.

 */

function _locale_import_parse_quoted($string) {

  if (substr($string, 0, 1) != substr($string, -1, 1)) {

    return FALSE;   // Start and end quotes must be the same

  }

  $quote = substr($string, 0, 1);

  $string = substr($string, 1, -1);

  if ($quote == '"') {        // Double quotes: strip slashes

    return stripcslashes($string);

  }

  elseif ($quote == "'") {  // Simple quote: return as-is

    return $string;

  }

  else {

    return FALSE;             // Unrecognized quote

  }

}

/**

 * @} End of "locale-api-import-export"

 */

/**

 * Parses a JavaScript file, extracts strings wrapped in Drupal.t() and

 * Drupal.formatPlural() and inserts them into the database.

 */

function _locale_parse_js_file($filepath) {

  global $language;

  // The file path might contain a query string, so make sure we only use the

  // actual file.

  $parsed_url = drupal_parse_url($filepath);

  $filepath = $parsed_url['path'];

  // Load the JavaScript file.

  $file = file_get_contents($filepath);

  // Match all calls to Drupal.t() in an array.

  // Note: \s also matches newlines with the 's' modifier.

  preg_match_all('~

    [^\w]Drupal\s*\.\s*t\s*                       # match "Drupal.t" with whitespace

    \(\s*                                         # match "(" argument list start

    (' . LOCALE_JS_STRING . ')\s*                 # capture string argument

    (?:,\s*' . LOCALE_JS_OBJECT . '\s*            # optionally capture str args

      (?:,\s*' . LOCALE_JS_OBJECT_CONTEXT . '\s*) # optionally capture context

    ?)?                                           # close optional args

    [,\)]                                         # match ")" or "," to finish

    ~sx', $file, $t_matches);

  // Match all Drupal.formatPlural() calls in another array.

  preg_match_all('~

    [^\w]Drupal\s*\.\s*formatPlural\s*  # match "Drupal.formatPlural" with whitespace

    \(                                  # match "(" argument list start

    \s*.+?\s*,\s*                       # match count argument

    (' . LOCALE_JS_STRING . ')\s*,\s*   # match singular string argument

    (                             # capture plural string argument

      (?:                         # non-capturing group to repeat string pieces

        (?:

          \'                      # match start of single-quoted string

          (?:\\\\\'|[^\'])*       # match any character except unescaped single-quote

          @count                  # match "@count"

          (?:\\\\\'|[^\'])*       # match any character except unescaped single-quote

          \'                      # match end of single-quoted string

          |

          "                       # match start of double-quoted string

          (?:\\\\"|[^"])*         # match any character except unescaped double-quote

          @count                  # match "@count"

          (?:\\\\"|[^"])*         # match any character except unescaped double-quote

          "                       # match end of double-quoted string

        )

        (?:\s*\+\s*)?             # match "+" with possible whitespace, for str concat

      )+                          # match multiple because we supports concatenating strs

    )\s*                          # end capturing of plural string argument

    (?:,\s*' . LOCALE_JS_OBJECT . '\s*          # optionally capture string args

      (?:,\s*' . LOCALE_JS_OBJECT_CONTEXT . '\s*)?  # optionally capture context

    )?

    [,\)]

    ~sx', $file, $plural_matches);

  $matches = array();

  // Add strings from Drupal.t().

  foreach ($t_matches[1] as $key => $string) {

    $matches[] = array(

      'string'  => $string,

      'context' => $t_matches[2][$key],

    );

  }

  // Add string from Drupal.formatPlural().

  foreach ($plural_matches[1] as $key => $string) {

    $matches[] = array(

      'string'  => $string,

      'context' => $plural_matches[3][$key],

    );

    // If there is also a plural version of this string, add it to the strings array.

    if (isset($plural_matches[2][$key])) {

      $matches[] = array(

        'string'  => $plural_matches[2][$key],

        'context' => $plural_matches[3][$key],

      );

    }

  }

  foreach ($matches as $key => $match) {

    // Remove the quotes and string concatenations from the string.

    $string = implode('', preg_split('~(?<!\\\\)[\'"]\s*\+\s*[\'"]~s', substr($match['string'], 1, -1)));

    $context = implode('', preg_split('~(?<!\\\\)[\'"]\s*\+\s*[\'"]~s', substr($match['context'], 1, -1)));

    $source = db_query("SELECT lid, location FROM {locales_source} WHERE source = :source AND context = :context AND textgroup = 'default'", array(':source' => $string, ':context' => $context))->fetchObject();

    if ($source) {

      // We already have this source string and now have to add the location

      // to the location column, if this file is not yet present in there.

      $locations = preg_split('~\s*;\s*~', $source->location);

      if (!in_array($filepath, $locations)) {

        $locations[] = $filepath;

        $locations = implode('; ', $locations);

        // Save the new locations string to the database.

        db_update('locales_source')

          ->fields(array(