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   1  <?php
   2  // $Id: language.inc,v 1.14.2.2 2010/03/22 12:18:04 goba Exp $
   3  
   4  /**
   5   * @file
   6   * Multiple language handling functionality.
   7   */
   8  
   9  /**
  10   *  Choose a language for the page, based on language negotiation settings.
  11   */
  12  function language_initialize() {
  13    global $user;
  14  
  15    // Configured presentation language mode.
  16    $mode = variable_get('language_negotiation', LANGUAGE_NEGOTIATION_NONE);
  17    // Get a list of enabled languages.
  18    $languages = language_list('enabled');
  19    $languages = $languages[1];
  20    
  21    switch ($mode) {
  22      case LANGUAGE_NEGOTIATION_NONE:
  23        return language_default();
  24  
  25      case LANGUAGE_NEGOTIATION_DOMAIN:
  26        foreach ($languages as $language) {
  27          $parts = parse_url($language->domain);
  28          if (!empty($parts['host']) && ($_SERVER['HTTP_HOST'] == $parts['host'])) {
  29            return $language;
  30          }
  31        }
  32        return language_default();
  33  
  34      case LANGUAGE_NEGOTIATION_PATH_DEFAULT:
  35      case LANGUAGE_NEGOTIATION_PATH:
  36        // $_GET['q'] might not be available at this time, because
  37        // path initialization runs after the language bootstrap phase.
  38        $args = isset($_GET['q']) ? explode('/', $_GET['q']) : array();
  39        $prefix = array_shift($args);
  40        // Search prefix within enabled languages.
  41        foreach ($languages as $language) {
  42          if (!empty($language->prefix) && $language->prefix == $prefix) {
  43            // Rebuild $GET['q'] with the language removed.
  44            $_GET['q'] = implode('/', $args);
  45            return $language;
  46          }
  47        }
  48        if ($mode == LANGUAGE_NEGOTIATION_PATH_DEFAULT) {
  49          // If we did not found the language by prefix, choose the default.
  50          return language_default();
  51        }
  52        break;
  53    }
  54  
  55    // User language.
  56    if ($user->uid && isset($languages[$user->language])) {
  57      return $languages[$user->language];
  58    }
  59  
  60    // Browser accept-language parsing.
  61    if ($language = language_from_browser()) {
  62      return $language;
  63    }
  64  
  65    // Fall back on the default if everything else fails.
  66    return language_default();
  67  }
  68  
  69  /**
  70   * Identify language from the Accept-language HTTP header we got.
  71   */
  72  function language_from_browser() {
  73    // Specified by the user via the browser's Accept Language setting
  74    // Samples: "hu, en-us;q=0.66, en;q=0.33", "hu,en-us;q=0.5"
  75    $browser_langs = array();
  76  
  77    if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
  78      $browser_accept = explode(",", $_SERVER['HTTP_ACCEPT_LANGUAGE']);
  79      for ($i = 0; $i < count($browser_accept); $i++) {
  80        // The language part is either a code or a code with a quality.
  81        // We cannot do anything with a * code, so it is skipped.
  82        // If the quality is missing, it is assumed to be 1 according to the RFC.
  83        if (preg_match("!([a-z-]+)(;q=([0-9\\.]+))?!", trim($browser_accept[$i]), $found)) {
  84          $browser_langs[$found[1]] = (isset($found[3]) ? (float) $found[3] : 1.0);
  85        }
  86      }
  87    }
  88  
  89    // Order the codes by quality
  90    arsort($browser_langs);
  91  
  92    // Try to find the first preferred language we have
  93    $languages = language_list('enabled');
  94    foreach ($browser_langs as $langcode => $q) {
  95      if (isset($languages['1'][$langcode])) {
  96        return $languages['1'][$langcode];
  97      }
  98    }
  99  }
 100  
 101  /**
 102   * Rewrite URL's with language based prefix. Parameters are the same
 103   * as those of the url() function.
 104   */
 105  function language_url_rewrite(&$path, &$options) {
 106    global $language;
 107  
 108    // Only modify relative (insite) URLs.
 109    if (empty($options['external'])) {
 110  
 111      // Language can be passed as an option, or we go for current language.
 112      if (!isset($options['language'])) {
 113        $options['language'] = $language;
 114      }
 115  
 116      switch (variable_get('language_negotiation', LANGUAGE_NEGOTIATION_NONE)) {
 117        case LANGUAGE_NEGOTIATION_NONE:
 118          // No language dependent path allowed in this mode.
 119          unset($options['language']);
 120          break;
 121  
 122        case LANGUAGE_NEGOTIATION_DOMAIN:
 123          if ($options['language']->domain) {
 124            // Ask for an absolute URL with our modified base_url.
 125            $options['absolute'] = TRUE;
 126            $options['base_url'] = $options['language']->domain;
 127          }
 128          break;
 129  
 130        case LANGUAGE_NEGOTIATION_PATH_DEFAULT:
 131          $default = language_default();
 132          if ($options['language']->language == $default->language) {
 133            break;
 134          }
 135          // Intentionally no break here.
 136  
 137        case LANGUAGE_NEGOTIATION_PATH:
 138          if (!empty($options['language']->prefix)) {
 139            $options['prefix'] = $options['language']->prefix .'/';
 140          }
 141          break;
 142      }
 143    }
 144  }