locale

gistfile1.aw

<?php

function locale($string = NULL, $context = NULL, $langcode = NULL) {
  global $language_interface, $user;

  // Use the advanced drupal_static() pattern, since this is called very often.
  static $drupal_static_fast;
  if (!isset($drupal_static_fast)) {
    $drupal_static_fast['locale'] = &drupal_static(__FUNCTION__);
  }
  $locale_cache = &$drupal_static_fast['locale'];
  if (empty($local_cache)) {
    $locale_cache = new LocaleCache(array_keys($user->roles));
  }
  
  if (!isset($string)) {
    // Return all cached strings if no string was specified
    return $locale_cache->getAll();
  } 
  
  $langcode = isset($langcode) ? $langcode : $language_interface->langcode;
  
  return $locale_cache->get($string, $context, $langcode);
} 

LocaleCache.php

<?php

/**
 * @file
 * Definition of LocaleCache
 */

namespace Drupal\locale;

/**
 * Dynamic building of the locale cache.
 */
class LocaleCache {

  protected $rids = array();

  protected $front_load_cids = array();

  protected $data = array();

  protected $keysToPersist = array();

  public function __construct(array $roles) {
    $this->rids = array_keys($roles);

    $this->frontLoadCache();
  }

  public function __destruct() {
    if (!empty($this-keysToPersist())) {
      $data = array_keys($this->data) + $this->keysToPersist();
      cache()->set("locale:frontload:" . implode(':', $this->rids), array_keys($this->data));
    }
  }

  protected function frontLoadCache() {
    // Get the list of cids to front load for this set of rids.
    if ($cache = cache()->get("locale:frontload:" . implode(':', $this->rids))) {


      // Frontloadem.
      foreach (cache()->getMultiple($this->front_load_cids) as $cid => $cache) {
        $this->data[$cid] = $cache->data;
      }
    }
  }

  function persist($cid) {
    $this->keysToPersist[] = $cid;
  }

  /**
   * Overrides DrupalCacheArray::resolveCacheMiss().
   */
  public function get($string, $context, $langcode) {
    $cid = "$langcode:$context:$string";
    if (isset($this->data[$cid])) {
      return $this->data[$cid];
    }
    $this->persist($cid);

    // Even if we didn't frontload this string from cache, it still may be
    // cached, so check before hitting the database.
    if ($cache = cache()->get($cid)) {
      $this->data[$cid] = $cache->data;
      return $this->data[$cid];
    }

    // Cache miss, so fetch from the database.
    $translation = db_query("SELECT s.lid, t.translation, s.version FROM {locales_source} s LEFT JOIN {locales_target} t ON s.lid = t.lid AND t.language = :language WHERE s.source = :source AND s.context = :context", array(
      ':language' => $langcode,
      ':source' => $string,
      ':context' => $context,
    ))->fetchObject();
    if ($translation) {
      if ($translation->version != VERSION) {
        // This is the first use of this string under current Drupal version.
        // Update the {locales_source} table to indicate the string is current.
        db_update('locales_source')
          ->fields(array('version' => VERSION))
          ->condition('lid', $translation->lid)
          ->execute();
      }
      $value = !empty($translation->translation) ? $translation->translation : TRUE;
    }
    else {
      // We don't have the source string, update the {locales_source} table to
      // indicate the string is not translated.
      db_merge('locales_source')
        ->insertFields(array(
          'location' => request_uri(),
          'version' => VERSION,
        ))
        ->key(array(
          'source' => $offset,
          'context' => $this->context,
        ))
        ->execute();
        $value = TRUE;
    }
    cache()->set($cid, $value);
    $this->data[$cid] = $value;
    return $value;
  }

  /**
   * Don't use this unless you know what you're doing.
   */
  public function getAll() {
    // Load all the things and return them.
  }
}