Feature 1451 : localization with gettext

Use php-gettext (developpement version rev43, because of php5.3) as fallback
Use native language (english) instead of key for translation
Keep directory en_UK for english customization
Need some refactoring for plurals

Todo : managing plugins in the same way

git-svn-id: http://piwigo.org/svn/trunk@5021 68402e56-0260-453c-a942-63ccdbb3a9ee

3 files changed, 993 insertions, 0 deletions

diff --git a/include/php-gettext/gettext.inc.php b/include/php-gettext/gettext.inc.php
new file mode 100644
index 000000000..69d4d7c2a
--- /dev/null
+++ b/include/php-gettext/gettext.inc.php
@@ -0,0 +1,418 @@
+<?php
+/*
+   Copyright (c) 2005 Steven Armstrong <sa at c-area dot ch>
+   Copyright (c) 2009 Danilo Segan <danilo@kvota.net>
+
+   Drop in replacement for native gettext.
+
+   This file is part of PHP-gettext.
+
+   PHP-gettext is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   PHP-gettext 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with PHP-gettext; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+*/
+/*
+LC_CTYPE        0
+LC_NUMERIC      1
+LC_TIME         2
+LC_COLLATE      3
+LC_MONETARY     4
+LC_MESSAGES     5
+LC_ALL          6
+*/
+
+
+// LC_MESSAGES is not available if php-gettext is not loaded
+// while the other constants are already available from session extension.
+if (!defined('LC_MESSAGES')) {
+  define('LC_MESSAGES',	5);
+}
+
+require('streams.php');
+require('gettext.php');
+
+
+// Variables
+
+global $text_domains, $default_domain, $LC_CATEGORIES, $EMULATEGETTEXT, $CURRENTLOCALE;
+$text_domains = array();
+$default_domain = 'messages';
+$LC_CATEGORIES = array('LC_CTYPE', 'LC_NUMERIC', 'LC_TIME', 'LC_COLLATE', 'LC_MONETARY', 'LC_MESSAGES', 'LC_ALL');
+$EMULATEGETTEXT = 0;
+$CURRENTLOCALE = '';
+
+/* Class to hold a single domain included in $text_domains. */
+class domain {
+  var $l10n;
+  var $path;
+  var $codeset;
+}
+
+// Utility functions
+
+/**
+ * Return a list of locales to try for any POSIX-style locale specification.
+ */
+function get_list_of_locales($locale) {
+  /* Figure out all possible locale names and start with the most
+   * specific ones.  I.e. for sr_CS.UTF-8@latin, look through all of
+   * sr_CS.UTF-8@latin, sr_CS@latin, sr@latin, sr_CS.UTF-8, sr_CS, sr.
+   */
+  $locale_names = array();
+  $lang = NULL;
+  $country = NULL;
+  $charset = NULL;
+  $modifier = NULL;
+  if ($locale) {
+    if (preg_match("/^(?P<lang>[a-z]{2,3})"              // language code
+                   ."(?:_(?P<country>[A-Z]{2}))?"           // country code
+                   ."(?:\.(?P<charset>[-A-Za-z0-9_]+))?"    // charset
+                   ."(?:@(?P<modifier>[-A-Za-z0-9_]+))?$/",  // @ modifier
+                   $locale, $matches)) {
+
+      if (isset($matches["lang"])) $lang = $matches["lang"];
+      if (isset($matches["country"])) $country = $matches["country"];
+      if (isset($matches["charset"])) $charset = $matches["charset"];
+      if (isset($matches["modifier"])) $modifier = $matches["modifier"];
+
+      if ($modifier) {
+        if ($country) {
+          if ($charset)
+            array_push($locale_names, "${lang}_$country.$charset@$modifier");
+          array_push($locale_names, "${lang}_$country@$modifier");
+        } elseif ($charset)
+            array_push($locale_names, "${lang}.$charset@$modifier");
+        array_push($locale_names, "$lang@$modifier");
+      }
+      if ($country) {
+        if ($charset)
+          array_push($locale_names, "${lang}_$country.$charset");
+        array_push($locale_names, "${lang}_$country");
+      } elseif ($charset)
+          array_push($locale_names, "${lang}.$charset");
+      array_push($locale_names, $lang);
+    }
+
+    // If the locale name doesn't match POSIX style, just include it as-is.
+    if (!in_array($locale, $locale_names))
+      array_push($locale_names, $locale);
+  }
+  return $locale_names;
+}
+
+/**
+ * Utility function to get a StreamReader for the given text domain.
+ */
+function _get_reader($domain=null, $category=5, $enable_cache=true) {
+    global $text_domains, $default_domain, $LC_CATEGORIES;
+    if (!isset($domain)) $domain = $default_domain;
+    if (!isset($text_domains[$domain]->l10n)) {
+        // get the current locale
+        $locale = _setlocale(LC_MESSAGES, 0);
+        $bound_path = isset($text_domains[$domain]->path) ?
+          $text_domains[$domain]->path : './';
+        $subpath = $LC_CATEGORIES[$category] ."/$domain.mo";
+
+        $locale_names = get_list_of_locales($locale);
+        $input = null;
+        foreach ($locale_names as $locale) {
+          $full_path = $bound_path . $locale . "/" . $subpath;
+          if (file_exists($full_path)) {
+            $input = new FileReader($full_path);
+            break;
+          }
+        }
+
+        if (!array_key_exists($domain, $text_domains)) {
+          // Initialize an empty domain object.
+          $text_domains[$domain] = new domain();
+        }
+        $text_domains[$domain]->l10n = new gettext_reader($input,
+                                                          $enable_cache);
+    }
+    return $text_domains[$domain]->l10n;
+}
+
+/**
+ * Returns whether we are using our emulated gettext API or PHP built-in one.
+ */
+function locale_emulation() {
+    global $EMULATEGETTEXT;
+    return $EMULATEGETTEXT;
+}
+
+/**
+ * Checks if the current locale is supported on this system.
+ */
+function _check_locale() {
+    global $EMULATEGETTEXT;
+    return !$EMULATEGETTEXT;
+}
+
+/**
+ * Get the codeset for the given domain.
+ */
+function _get_codeset($domain=null) {
+    global $text_domains, $default_domain, $LC_CATEGORIES;
+    if (!isset($domain)) $domain = $default_domain;
+    return (isset($text_domains[$domain]->codeset))? $text_domains[$domain]->codeset : ini_get('mbstring.internal_encoding');
+}
+
+/**
+ * Convert the given string to the encoding set by bind_textdomain_codeset.
+ */
+function _encode($text) {
+    $source_encoding = mb_detect_encoding($text);
+    $target_encoding = _get_codeset();
+    if ($source_encoding != $target_encoding) {
+        return mb_convert_encoding($text, $target_encoding, $source_encoding);
+    }
+    else {
+        return $text;
+    }
+}
+
+
+
+
+// Custom implementation of the standard gettext related functions
+
+/**
+ * Returns passed in $locale, or environment variable $LANG if $locale == ''.
+ */
+function _get_default_locale($locale) {
+  if ($locale == '') // emulate variable support
+    return getenv('LANG');
+  else
+    return $locale;
+}
+
+/**
+ * Sets a requested locale, if needed emulates it.
+ */
+function _setlocale($category, $locale) {
+    global $CURRENTLOCALE, $EMULATEGETTEXT;
+    if ($locale === 0) { // use === to differentiate between string "0"
+        if ($CURRENTLOCALE != '')
+            return $CURRENTLOCALE;
+        else
+            // obey LANG variable, maybe extend to support all of LC_* vars
+            // even if we tried to read locale without setting it first
+            return _setlocale($category, $CURRENTLOCALE);
+    } else {
+        if (function_exists('setlocale')) {
+          $ret = setlocale($category, $locale);
+          if (($locale == '' and !$ret) or // failed setting it by env
+              ($locale != '' and $ret != $locale)) { // failed setting it
+            // Failed setting it according to environment.
+            $CURRENTLOCALE = _get_default_locale($locale);
+            $EMULATEGETTEXT = 1;
+          } else {
+            $CURRENTLOCALE = $ret;
+            $EMULATEGETTEXT = 0;
+          }
+        } else {
+          // No function setlocale(), emulate it all.
+          $CURRENTLOCALE = _get_default_locale($locale);
+          $EMULATEGETTEXT = 1;
+        }
+        // Allow locale to be changed on the go for one translation domain.
+        global $text_domains, $default_domain;
+        unset($text_domains[$default_domain]->l10n);
+        return $CURRENTLOCALE;
+    }
+}
+
+/**
+ * Sets the path for a domain.
+ */
+function _bindtextdomain($domain, $path) {
+    global $text_domains;
+    // ensure $path ends with a slash ('/' should work for both, but lets still play nice)
+    if (substr(php_uname(), 0, 7) == "Windows") {
+      if ($path[strlen($path)-1] != '\\' and $path[strlen($path)-1] != '/')
+        $path .= '\\';
+    } else {
+      if ($path[strlen($path)-1] != '/')
+        $path .= '/';
+    }
+    if (!array_key_exists($domain, $text_domains)) {
+      // Initialize an empty domain object.
+      $text_domains[$domain] = new domain();
+    }
+    $text_domains[$domain]->path = $path;
+}
+
+/**
+ * Specify the character encoding in which the messages from the DOMAIN message catalog will be returned.
+ */
+function _bind_textdomain_codeset($domain, $codeset) {
+    global $text_domains;
+    $text_domains[$domain]->codeset = $codeset;
+}
+
+/**
+ * Sets the default domain.
+ */
+function _textdomain($domain) {
+    global $default_domain;
+    $default_domain = $domain;
+}
+
+/**
+ * Lookup a message in the current domain.
+ */
+function _gettext($msgid) {
+    $l10n = _get_reader();
+    //return $l10n->translate($msgid);
+    return _encode($l10n->translate($msgid));
+}
+/**
+ * Alias for gettext.
+ */
+function __($msgid) {
+    return _gettext($msgid);
+}
+/**
+ * Plural version of gettext.
+ */
+function _ngettext($single, $plural, $number) {
+    $l10n = _get_reader();
+    //return $l10n->ngettext($single, $plural, $number);
+    return _encode($l10n->ngettext($single, $plural, $number));
+}
+
+/**
+ * Override the current domain.
+ */
+function _dgettext($domain, $msgid) {
+    $l10n = _get_reader($domain);
+    //return $l10n->translate($msgid);
+    return _encode($l10n->translate($msgid));
+}
+/**
+ * Plural version of dgettext.
+ */
+function _dngettext($domain, $single, $plural, $number) {
+    $l10n = _get_reader($domain);
+    //return $l10n->ngettext($single, $plural, $number);
+    return _encode($l10n->ngettext($single, $plural, $number));
+}
+
+/**
+ * Overrides the domain and category for a single lookup.
+ */
+function _dcgettext($domain, $msgid, $category) {
+    $l10n = _get_reader($domain, $category);
+    //return $l10n->translate($msgid);
+    return _encode($l10n->translate($msgid));
+}
+/**
+ * Plural version of dcgettext.
+ */
+function _dcngettext($domain, $single, $plural, $number, $category) {
+    $l10n = _get_reader($domain, $category);
+    //return $l10n->ngettext($single, $plural, $number);
+    return _encode($l10n->ngettext($single, $plural, $number));
+}
+
+
+
+// Wrappers to use if the standard gettext functions are available, but the current locale is not supported by the system.
+// Use the standard impl if the current locale is supported, use the custom impl otherwise.
+
+function T_setlocale($category, $locale) {
+    return _setlocale($category, $locale);
+}
+
+function T_bindtextdomain($domain, $path) {
+    if (_check_locale()) return bindtextdomain($domain, $path);
+    else return _bindtextdomain($domain, $path);
+}
+function T_bind_textdomain_codeset($domain, $codeset) {
+    // bind_textdomain_codeset is available only in PHP 4.2.0+
+    if (_check_locale() and function_exists('bind_textdomain_codeset')) return bind_textdomain_codeset($domain, $codeset);
+    else return _bind_textdomain_codeset($domain, $codeset);
+}
+function T_textdomain($domain) {
+    if (_check_locale()) return textdomain($domain);
+    else return _textdomain($domain);
+}
+function T_gettext($msgid) {
+    if (_check_locale()) return gettext($msgid);
+    else return _gettext($msgid);
+}
+function T_($msgid) {
+    if (_check_locale()) return _($msgid);
+    return __($msgid);
+}
+function T_ngettext($single, $plural, $number) {
+    if (_check_locale()) return ngettext($single, $plural, $number);
+    else return _ngettext($single, $plural, $number);
+}
+function T_dgettext($domain, $msgid) {
+    if (_check_locale()) return dgettext($domain, $msgid);
+    else return _dgettext($domain, $msgid);
+}
+function T_dngettext($domain, $single, $plural, $number) {
+    if (_check_locale()) return dngettext($domain, $single, $plural, $number);
+    else return _dngettext($domain, $single, $plural, $number);
+}
+function T_dcgettext($domain, $msgid, $category) {
+    if (_check_locale()) return dcgettext($domain, $msgid, $category);
+    else return _dcgettext($domain, $msgid, $category);
+}
+function T_dcngettext($domain, $single, $plural, $number, $category) {
+    if (_check_locale()) return dcngettext($domain, $single, $plural, $number, $category);
+    else return _dcngettext($domain, $single, $plural, $number, $category);
+}
+
+
+
+// Wrappers used as a drop in replacement for the standard gettext functions
+
+if (!function_exists('gettext')) {
+    function bindtextdomain($domain, $path) {
+        return _bindtextdomain($domain, $path);
+    }
+    function bind_textdomain_codeset($domain, $codeset) {
+        return _bind_textdomain_codeset($domain, $codeset);
+    }
+    function textdomain($domain) {
+        return _textdomain($domain);
+    }
+    function gettext($msgid) {
+        return _gettext($msgid);
+    }
+    function _($msgid) {
+        return __($msgid);
+    }
+    function ngettext($single, $plural, $number) {
+        return _ngettext($single, $plural, $number);
+    }
+    function dgettext($domain, $msgid) {
+        return _dgettext($domain, $msgid);
+    }
+    function dngettext($domain, $single, $plural, $number) {
+        return _dngettext($domain, $single, $plural, $number);
+    }
+    function dcgettext($domain, $msgid, $category) {
+        return _dcgettext($domain, $msgid, $category);
+    }
+    function dcngettext($domain, $single, $plural, $number, $category) {
+        return _dcngettext($domain, $single, $plural, $number, $category);
+    }
+}
+
+?>
diff --git a/include/php-gettext/gettext.php b/include/php-gettext/gettext.php
new file mode 100644
index 000000000..f11da2e27
--- /dev/null
+++ b/include/php-gettext/gettext.php
@@ -0,0 +1,408 @@
+<?php
+/*
+   Copyright (c) 2003, 2009 Danilo Segan <danilo@kvota.net>.
+   Copyright (c) 2005 Nico Kaiser <nico@siriux.net>
+
+   This file is part of PHP-gettext.
+
+   PHP-gettext is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   PHP-gettext 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with PHP-gettext; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+*/
+
+/**
+ * Provides a simple gettext replacement that works independently from
+ * the system's gettext abilities.
+ * It can read MO files and use them for translating strings.
+ * The files are passed to gettext_reader as a Stream (see streams.php)
+ *
+ * This version has the ability to cache all strings and translations to
+ * speed up the string lookup.
+ * While the cache is enabled by default, it can be switched off with the
+ * second parameter in the constructor (e.g. whenusing very large MO files
+ * that you don't want to keep in memory)
+ */
+class gettext_reader {
+  //public:
+   var $error = 0; // public variable that holds error code (0 if no error)
+
+   //private:
+  var $BYTEORDER = 0;        // 0: low endian, 1: big endian
+  var $STREAM = NULL;
+  var $short_circuit = false;
+  var $enable_cache = false;
+  var $originals = NULL;      // offset of original table
+  var $translations = NULL;    // offset of translation table
+  var $pluralheader = NULL;    // cache header field for plural forms
+  var $total = 0;          // total string count
+  var $table_originals = NULL;  // table for original strings (offsets)
+  var $table_translations = NULL;  // table for translated strings (offsets)
+  var $cache_translations = NULL;  // original -> translation mapping
+
+
+  /* Methods */
+
+
+  /**
+   * Reads a 32bit Integer from the Stream
+   *
+   * @access private
+   * @return Integer from the Stream
+   */
+  function readint() {
+      if ($this->BYTEORDER == 0) {
+        // low endian
+        $input=unpack('V', $this->STREAM->read(4));
+        return array_shift($input);
+      } else {
+        // big endian
+        $input=unpack('N', $this->STREAM->read(4));
+        return array_shift($input);
+      }
+    }
+
+  function read($bytes) {
+    return $this->STREAM->read($bytes);
+  }
+
+  /**
+   * Reads an array of Integers from the Stream
+   *
+   * @param int count How many elements should be read
+   * @return Array of Integers
+   */
+  function readintarray($count) {
+    if ($this->BYTEORDER == 0) {
+        // low endian
+        return unpack('V'.$count, $this->STREAM->read(4 * $count));
+      } else {
+        // big endian
+        return unpack('N'.$count, $this->STREAM->read(4 * $count));
+      }
+  }
+
+  /**
+   * Constructor
+   *
+   * @param object Reader the StreamReader object
+   * @param boolean enable_cache Enable or disable caching of strings (default on)
+   */
+  function gettext_reader($Reader, $enable_cache = true) {
+    // If there isn't a StreamReader, turn on short circuit mode.
+    if (! $Reader || isset($Reader->error) ) {
+      $this->short_circuit = true;
+      return;
+    }
+
+    // Caching can be turned off
+    $this->enable_cache = $enable_cache;
+
+    $MAGIC1 = "\x95\x04\x12\xde";
+    $MAGIC2 = "\xde\x12\x04\x95";
+
+    $this->STREAM = $Reader;
+    $magic = $this->read(4);
+    if ($magic == $MAGIC1) {
+      $this->BYTEORDER = 1;
+    } elseif ($magic == $MAGIC2) {
+      $this->BYTEORDER = 0;
+    } else {
+      $this->error = 1; // not MO file
+      return false;
+    }
+
+    // FIXME: Do we care about revision? We should.
+    $revision = $this->readint();
+
+    $this->total = $this->readint();
+    $this->originals = $this->readint();
+    $this->translations = $this->readint();
+  }
+
+  /**
+   * Loads the translation tables from the MO file into the cache
+   * If caching is enabled, also loads all strings into a cache
+   * to speed up translation lookups
+   * 
+   * @access private
+   */
+  function load_tables() {
+    if (is_array($this->cache_translations) &&
+      is_array($this->table_originals) &&
+      is_array($this->table_translations))
+      return;
+
+    /* get original and translations tables */
+    $this->STREAM->seekto($this->originals);
+    $this->table_originals = $this->readintarray($this->total * 2);
+    $this->STREAM->seekto($this->translations);
+    $this->table_translations = $this->readintarray($this->total * 2);
+
+    if ($this->enable_cache) {
+      $this->cache_translations = array ();
+      /* read all strings in the cache */
+      for ($i = 0; $i < $this->total; $i++) {
+        $this->STREAM->seekto($this->table_originals[$i * 2 + 2]);
+        $original = $this->STREAM->read($this->table_originals[$i * 2 + 1]);
+        $this->STREAM->seekto($this->table_translations[$i * 2 + 2]);
+        $translation = $this->STREAM->read($this->table_translations[$i * 2 + 1]);
+        $this->cache_translations[$original] = $translation;
+      }
+    }
+  }
+
+  /**
+   * Returns a string from the "originals" table
+   *
+   * @access private
+   * @param int num Offset number of original string
+   * @return string Requested string if found, otherwise ''
+   */
+  function get_original_string($num) {
+    $length = $this->table_originals[$num * 2 + 1];
+    $offset = $this->table_originals[$num * 2 + 2];
+    if (! $length)
+      return '';
+    $this->STREAM->seekto($offset);
+    $data = $this->STREAM->read($length);
+    return (string)$data;
+  }
+
+  /**
+   * Returns a string from the "translations" table
+   *
+   * @access private
+   * @param int num Offset number of original string
+   * @return string Requested string if found, otherwise ''
+   */
+  function get_translation_string($num) {
+    $length = $this->table_translations[$num * 2 + 1];
+    $offset = $this->table_translations[$num * 2 + 2];
+    if (! $length)
+      return '';
+    $this->STREAM->seekto($offset);
+    $data = $this->STREAM->read($length);
+    return (string)$data;
+  }
+
+  /**
+   * Binary search for string
+   *
+   * @access private
+   * @param string string
+   * @param int start (internally used in recursive function)
+   * @param int end (internally used in recursive function)
+   * @return int string number (offset in originals table)
+   */
+  function find_string($string, $start = -1, $end = -1) {
+    if (($start == -1) or ($end == -1)) {
+      // find_string is called with only one parameter, set start end end
+      $start = 0;
+      $end = $this->total;
+    }
+    if (abs($start - $end) <= 1) {
+      // We're done, now we either found the string, or it doesn't exist
+      $txt = $this->get_original_string($start);
+      if ($string == $txt)
+        return $start;
+      else
+        return -1;
+    } else if ($start > $end) {
+      // start > end -> turn around and start over
+      return $this->find_string($string, $end, $start);
+    } else {
+      // Divide table in two parts
+      $half = (int)(($start + $end) / 2);
+      $cmp = strcmp($string, $this->get_original_string($half));
+      if ($cmp == 0)
+        // string is exactly in the middle => return it
+        return $half;
+      else if ($cmp < 0)
+        // The string is in the upper half
+        return $this->find_string($string, $start, $half);
+      else
+        // The string is in the lower half
+        return $this->find_string($string, $half, $end);
+    }
+  }
+
+  /**
+   * Translates a string
+   *
+   * @access public
+   * @param string string to be translated
+   * @return string translated string (or original, if not found)
+   */
+  function translate($string) {
+    if ($this->short_circuit)
+      return $string;
+    $this->load_tables();
+
+    if ($this->enable_cache) {
+      // Caching enabled, get translated string from cache
+      if (array_key_exists($string, $this->cache_translations))
+        return $this->cache_translations[$string];
+      else
+        return $string;
+    } else {
+      // Caching not enabled, try to find string
+      $num = $this->find_string($string);
+      if ($num == -1)
+        return $string;
+      else
+        return $this->get_translation_string($num);
+    }
+  }
+
+  /**
+   * Sanitize plural form expression for use in PHP eval call.
+   *
+   * @access private
+   * @return string sanitized plural form expression
+   */
+  function sanitize_plural_expression($expr) {
+    // Get rid of disallowed characters.
+    $expr = preg_replace('@[^a-zA-Z0-9_:;\(\)\?\|\&=!<>+*/\%-]@', '', $expr);
+
+    // Add parenthesis for tertiary '?' operator.
+    $expr .= ';';
+    $res = '';
+    $p = 0;
+    for ($i = 0; $i < strlen($expr); $i++) {
+      $ch = $expr[$i];
+      switch ($ch) {
+      case '?':
+        $res .= ' ? (';
+        $p++;
+        break;
+      case ':':
+        $res .= ') : (';
+        break;
+      case ';':
+        $res .= str_repeat( ')', $p) . ';';
+        $p = 0;
+        break;
+      default:
+        $res .= $ch;
+      }
+    }
+    return $res;
+  }
+
+  /**
+   * Parse full PO header and extract only plural forms line.
+   *
+   * @access private
+   * @return string verbatim plural form header field
+   */
+  function extract_plural_forms_header_from_po_header($header) {
+    if (preg_match("/(^|\n)plural-forms: ([^\n]*)\n/i", $header, $regs))
+      $expr = $regs[2];
+    else
+      $expr = "nplurals=2; plural=n == 1 ? 0 : 1;";
+    return $expr;
+  }
+
+  /**
+   * Get possible plural forms from MO header
+   *
+   * @access private
+   * @return string plural form header
+   */
+  function get_plural_forms() {
+    // lets assume message number 0 is header
+    // this is true, right?
+    $this->load_tables();
+
+    // cache header field for plural forms
+    if (! is_string($this->pluralheader)) {
+      if ($this->enable_cache) {
+        $header = $this->cache_translations[""];
+      } else {
+        $header = $this->get_translation_string(0);
+      }
+      $expr = $this->extract_plural_forms_header_from_po_header($header);
+      $this->pluralheader = $this->sanitize_plural_expression($expr);
+    }
+    return $this->pluralheader;
+  }
+
+  /**
+   * Detects which plural form to take
+   *
+   * @access private
+   * @param n count
+   * @return int array index of the right plural form
+   */
+  function select_string($n) {
+    $string = $this->get_plural_forms();
+    $string = str_replace('nplurals',"\$total",$string);
+    $string = str_replace("n",$n,$string);
+    $string = str_replace('plural',"\$plural",$string);
+
+    $total = 0;
+    $plural = 0;
+
+    eval("$string");
+    if ($plural >= $total) $plural = $total - 1;
+    return $plural;
+  }
+
+  /**
+   * Plural version of gettext
+   *
+   * @access public
+   * @param string single
+   * @param string plural
+   * @param string number
+   * @return translated plural form
+   */
+  function ngettext($single, $plural, $number) {
+    if ($this->short_circuit) {
+      if ($number != 1)
+        return $plural;
+      else
+        return $single;
+    }
+
+    // find out the appropriate form
+    $select = $this->select_string($number);
+
+    // this should contains all strings separated by NULLs
+    $key = $single.chr(0).$plural;
+
+
+    if ($this->enable_cache) {
+      if (! array_key_exists($key, $this->cache_translations)) {
+        return ($number != 1) ? $plural : $single;
+      } else {
+        $result = $this->cache_translations[$key];
+        $list = explode(chr(0), $result);
+        return $list[$select];
+      }
+    } else {
+      $num = $this->find_string($key);
+      if ($num == -1) {
+        return ($number != 1) ? $plural : $single;
+      } else {
+        $result = $this->get_translation_string($num);
+        $list = explode(chr(0), $result);
+        return $list[$select];
+      }
+    }
+  }
+
+}
+
+?>
diff --git a/include/php-gettext/streams.php b/include/php-gettext/streams.php
new file mode 100644
index 000000000..3cdc1584e
--- /dev/null
+++ b/include/php-gettext/streams.php
@@ -0,0 +1,167 @@
+<?php
+/*
+   Copyright (c) 2003, 2005, 2006, 2009 Danilo Segan <danilo@kvota.net>.
+
+   This file is part of PHP-gettext.
+
+   PHP-gettext is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   PHP-gettext 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with PHP-gettext; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+*/
+
+
+  // Simple class to wrap file streams, string streams, etc.
+  // seek is essential, and it should be byte stream
+class StreamReader {
+  // should return a string [FIXME: perhaps return array of bytes?]
+  function read($bytes) {
+    return false;
+  }
+
+  // should return new position
+  function seekto($position) {
+    return false;
+  }
+
+  // returns current position
+  function currentpos() {
+    return false;
+  }
+
+  // returns length of entire stream (limit for seekto()s)
+  function length() {
+    return false;
+  }
+};
+
+class StringReader {
+  var $_pos;
+  var $_str;
+
+  function StringReader($str='') {
+    $this->_str = $str;
+    $this->_pos = 0;
+  }
+
+  function read($bytes) {
+    $data = substr($this->_str, $this->_pos, $bytes);
+    $this->_pos += $bytes;
+    if (strlen($this->_str)<$this->_pos)
+      $this->_pos = strlen($this->_str);
+
+    return $data;
+  }
+
+  function seekto($pos) {
+    $this->_pos = $pos;
+    if (strlen($this->_str)<$this->_pos)
+      $this->_pos = strlen($this->_str);
+    return $this->_pos;
+  }
+
+  function currentpos() {
+    return $this->_pos;
+  }
+
+  function length() {
+    return strlen($this->_str);
+  }
+
+};
+
+
+class FileReader {
+  var $_pos;
+  var $_fd;
+  var $_length;
+
+  function FileReader($filename) {
+    if (file_exists($filename)) {
+
+      $this->_length=filesize($filename);
+      $this->_pos = 0;
+      $this->_fd = fopen($filename,'rb');
+      if (!$this->_fd) {
+        $this->error = 3; // Cannot read file, probably permissions
+        return false;
+      }
+    } else {
+      $this->error = 2; // File doesn't exist
+      return false;
+    }
+  }
+
+  function read($bytes) {
+    if ($bytes) {
+      fseek($this->_fd, $this->_pos);
+
+      // PHP 5.1.1 does not read more than 8192 bytes in one fread()
+      // the discussions at PHP Bugs suggest it's the intended behaviour
+      $data = '';
+      while ($bytes > 0) {
+        $chunk  = fread($this->_fd, $bytes);
+        $data  .= $chunk;
+        $bytes -= strlen($chunk);
+      }
+      $this->_pos = ftell($this->_fd);
+
+      return $data;
+    } else return '';
+  }
+
+  function seekto($pos) {
+    fseek($this->_fd, $pos);
+    $this->_pos = ftell($this->_fd);
+    return $this->_pos;
+  }
+
+  function currentpos() {
+    return $this->_pos;
+  }
+
+  function length() {
+    return $this->_length;
+  }
+
+  function close() {
+    fclose($this->_fd);
+  }
+
+};
+
+// Preloads entire file in memory first, then creates a StringReader
+// over it (it assumes knowledge of StringReader internals)
+class CachedFileReader extends StringReader {
+  function CachedFileReader($filename) {
+    if (file_exists($filename)) {
+
+      $length=filesize($filename);
+      $fd = fopen($filename,'rb');
+
+      if (!$fd) {
+        $this->error = 3; // Cannot read file, probably permissions
+        return false;
+      }
+      $this->_str = fread($fd, $length);
+      fclose($fd);
+
+    } else {
+      $this->error = 2; // File doesn't exist
+      return false;
+    }
+  }
+};
+
+
+?>