Merge pull request #694 from ravishnair/CRM-12528

[civicrm-core.git] / CRM / Core / I18n.php

<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.3                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2013                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM is distributed in the hope that it will be useful, but     |
 | WITHOUT ANY WARRANTY; without even the implied warranty of         |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
 | See the GNU Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
*/

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2013
 * $Id$
 *
 */
class CRM_Core_I18n {

  /**
   * A PHP-gettext instance for string translation; should stay null if the strings are not to be translated (en_US).
   */
  private $_phpgettext = NULL;

  /**
   * Whether we are using native gettext or not.
   */
  private $_nativegettext = FALSE;

  /**
   * A locale-based constructor that shouldn't be called from outside of this class (use singleton() instead).
   *
   * @param  $locale string  the base of this certain object's existence
   *
   * @return         void
   */
  function __construct($locale) {
    if ($locale != '' and $locale != 'en_US') {
      $config = CRM_Core_Config::singleton();

      if (defined('CIVICRM_GETTEXT_NATIVE') && CIVICRM_GETTEXT_NATIVE && function_exists('gettext')) {
        // Note: the file hierarchy for .po must be, for example: l10n/fr_FR/LC_MESSAGES/civicrm.mo

        $this->_nativegettext = TRUE;

        $locale .= '.utf8';
        putenv("LANG=$locale");

        // CRM-11833 Avoid LC_ALL because of LC_NUMERIC and potential DB error.
        setlocale(LC_TIME, $locale);
        setlocale(LC_MESSAGES, $locale);
        setlocale(LC_CTYPE, $locale);

        bindtextdomain('civicrm', $config->gettextResourceDir);
        bind_textdomain_codeset('civicrm', 'UTF-8');
        textdomain('civicrm');

        $this->_phpgettext = new CRM_Core_I18n_NativeGettext();
        return;
      }

      // Otherwise, use PHP-gettext
      require_once 'PHPgettext/streams.php';
      require_once 'PHPgettext/gettext.php';

      $streamer = new FileReader($config->gettextResourceDir . $locale . DIRECTORY_SEPARATOR . 'civicrm.mo');
      $this->_phpgettext = new gettext_reader($streamer);
    }
  }

  /**
   * Returns whether gettext is running natively or using PHP-Gettext.
   *
   * @return bool True if gettext is native
   */
  function isNative() {
    return $this->_nativegettext;
  }

  /**
   * Return languages available in this instance of CiviCRM.
   *
   * @param $justEnabled boolean  whether to return all languages or just the enabled ones
   *
   * @return             array    of code/language name mappings
   */
  static function languages($justEnabled = FALSE) {
    static $all = NULL;
    static $enabled = NULL;

    if (!$all) {
      $all = CRM_Core_I18n_PseudoConstant::languages();

      // check which ones are available; add them to $all if not there already
      $config = CRM_Core_Config::singleton();
      $codes = array();
      if (is_dir($config->gettextResourceDir)) {
        $dir = opendir($config->gettextResourceDir);
        while ($filename = readdir($dir)) {
          if (preg_match('/^[a-z][a-z]_[A-Z][A-Z]$/', $filename)) {
            $codes[] = $filename;
            if (!isset($all[$filename])) {
              $all[$filename] = $filename;
            }
          }
        }
        closedir($dir);
      }

      // drop the unavailable languages (except en_US)
      foreach (array_keys($all) as $code) {
        if ($code == 'en_US') {
          continue;
        }
        if (!in_array($code, $codes))unset($all[$code]);
      }
    }

    if ($enabled === NULL) {
      $config = CRM_Core_Config::singleton();
      $enabled = array();
      if (isset($config->languageLimit) and $config->languageLimit) {
        foreach ($all as $code => $name) {
          if (in_array($code, array_keys($config->languageLimit))) {
            $enabled[$code] = $name;
          }
        }
      }
    }

    return $justEnabled ? $enabled : $all;
  }

  /**
   * Replace arguments in a string with their values. Arguments are represented by % followed by their number.
   *
   * @param  $str string  source string
   * @param       mixed   arguments, can be passed in an array or through single variables
   *
   * @return      string  modified string
   */
  function strarg($str) {
    $tr = array();
    $p = 0;
    for ($i = 1; $i < func_num_args(); $i++) {
      $arg = func_get_arg($i);
      if (is_array($arg)) {
        foreach ($arg as $aarg) {
          $tr['%' . ++$p] = $aarg;
        }
      }
      else {
        $tr['%' . ++$p] = $arg;
      }
    }
    return strtr($str, $tr);
  }

  /**
   * Smarty block function, provides gettext support for smarty.
   *
   * The block content is the text that should be translated.
   *
   * Any parameter that is sent to the function will be represented as %n in the translation text,
   * where n is 1 for the first parameter. The following parameters are reserved:
   *   - escape - sets escape mode:
   *       - 'html' for HTML escaping, this is the default.
   *       - 'js' for javascript escaping.
   *       - 'no'/'off'/0 - turns off escaping
   *   - plural - The plural version of the text (2nd parameter of ngettext())
   *   - count - The item count for plural mode (3rd parameter of ngettext())
   *   - context - gettext context of that string (for homonym handling)
   *
   * @param $text   string  the original string
   * @param $params array   the params of the translation (if any)
   *
   * @return        string  the translated string
   */
  function crm_translate($text, $params = array()) {
    if (isset($params['escape'])) {
      $escape = $params['escape'];
      unset($params['escape']);
    }

    // sometimes we need to {ts}-tag a string, but don’t want to
    // translate it in the template (like civicrm_navigation.tpl),
    // because we handle the translation in a different way (CRM-6998)
    // in such cases we return early, only doing SQL/JS escaping
    if (isset($params['skip']) and $params['skip']) {
      if (isset($escape) and ($escape == 'sql')) {
        $text = mysql_escape_string($text);
      }
      if (isset($escape) and ($escape == 'js')) {
        $text = addcslashes($text, "'");
      }
      return $text;
    }

    if (isset($params['plural'])) {
      $plural = $params['plural'];
      unset($params['plural']);
      if (isset($params['count'])) {
        $count = $params['count'];
      }
    }

    if (isset($params['context'])) {
      $context = $params['context'];
      unset($params['context']);
    }
    else {
      $context = NULL;
    }

    // do all wildcard translations first
    $config = CRM_Core_Config::singleton();
    $stringTable = CRM_Utils_Array::value($config->lcMessages,
      $config->localeCustomStrings
    );

    $exactMatch = FALSE;
    if (isset($stringTable['enabled']['exactMatch'])) {
      foreach ($stringTable['enabled']['exactMatch'] as $search => $replace) {
        if ($search === $text) {
          $exactMatch = TRUE;
          $text = $replace;
          break;
        }
      }
    }

    if (!$exactMatch &&
      isset($stringTable['enabled']['wildcardMatch'])
    ) {
      $search  = array_keys($stringTable['enabled']['wildcardMatch']);
      $replace = array_values($stringTable['enabled']['wildcardMatch']);
      $text    = str_replace($search,
        $replace,
        $text
      );
    }

    // dont translate if we've done exactMatch already
    if (!$exactMatch) {
      // use plural if required parameters are set
      if (isset($count) && isset($plural)) {

        if ($this->_phpgettext) {
          $text = $this->_phpgettext->ngettext($text, $plural, $count);
        }
        else {
          // if the locale's not set, we do ngettext work by hand
          // if $count == 1 then $text = $text, else $text = $plural
          if ($count != 1) {
            $text = $plural;
          }
        }

        // expand %count in translated string to $count
        $text = strtr($text, array('%count' => $count));

        // if not plural, but the locale's set, translate
      }
      elseif ($this->_phpgettext) {
        if ($context) {
          $text = $this->_phpgettext->pgettext($context, $text);
        }
        else {
          $text = $this->_phpgettext->translate($text);
        }
      }
    }

    // replace the numbered %1, %2, etc. params if present
    if (count($params)) {
      $text = $this->strarg($text, $params);
    }

    // escape SQL if we were asked for it
    if (isset($escape) and ($escape == 'sql')) {
      $text = mysql_escape_string($text);
    }

    // escape for JavaScript (if requested)
    if (isset($escape) and ($escape == 'js')) {
      $text = addcslashes($text, "'");
    }

    return $text;
  }

  /**
   * Translate a string to the current locale.
   *
   * @param  $string string  this string should be translated
   *
   * @return         string  the translated string
   */
  function translate($string) {
    return ($this->_phpgettext) ? $this->_phpgettext->translate($string) : $string;
  }

  /**
   * Localize (destructively) array values.
   *
   * @param  $array array  the array for localization (in place)
   * @param  $params array an array of additional parameters
   *
   * @return        void
   */
  function localizeArray(
    &$array,
    $params = array()
  ) {
    global $tsLocale;

    if ($tsLocale == 'en_US') {
      return;
    }

    foreach ($array as & $value) {
      if ($value) {
        $value = ts($value, $params);
      }
    }
  }

  /**
   * Localize (destructively) array elements with keys of 'title'.
   *
   * @param  $array array  the array for localization (in place)
   *
   * @return        void
   */
  function localizeTitles(&$array) {
    foreach ($array as $key => $value) {
      if (is_array($value)) {
        $this->localizeTitles($value);
        $array[$key] = $value;
      }
      elseif ((string ) $key == 'title') {
        $array[$key] = ts($value, array('context' => 'menu'));
      }
    }
  }

  /**
   * Static instance provider - return the instance for the current locale.
   */
  static function &singleton() {
    static $singleton = array();

    global $tsLocale;
    if (!isset($singleton[$tsLocale])) {
      $singleton[$tsLocale] = new CRM_Core_I18n($tsLocale);
    }

    return $singleton[$tsLocale];
  }

  /**
   * Set the LC_TIME locale if it's not set already (for a given language choice).
   *
   * @return string  the final LC_TIME that got set
   */
  static function setLcTime() {
    static $locales = array();

    global $tsLocale;
    if (!isset($locales[$tsLocale])) {
      // with the config being set to pl_PL: try pl_PL.UTF-8,
      // then pl_PL, if neither present fall back to C
      $locales[$tsLocale] = setlocale(LC_TIME, $tsLocale . '.UTF-8', $tsLocale, 'C');
    }

    return $locales[$tsLocale];
  }
}

/**
 * Short-named function for string translation, defined in global scope so it's available everywhere.
 *
 * @param  $text   string  string for translating
 * @param  $params array   an array of additional parameters
 *
 * @return         string  the translated string
 */
function ts($text, $params = array()) {
  static $config = NULL;
  static $locale = NULL;
  static $i18n = NULL;
  static $function = NULL;

  if ($text == '') {
    return '';
  }

  if (!$config) {
    $config = CRM_Core_Config::singleton();
  }

  global $tsLocale;
  if (!$i18n or $locale != $tsLocale) {
    $i18n = CRM_Core_I18n::singleton();
    $locale = $tsLocale;
    if (isset($config->customTranslateFunction) and function_exists($config->customTranslateFunction)) {
      $function = $config->customTranslateFunction;
    }
  }

  if ($function) {
    return $function($text, $params);
  }
  else {
    return $i18n->crm_translate($text, $params);
  }
}