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<?php
/**
* Copyright (c) 2003 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
*
* @copyright © 2004-2006 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: gettext.class.php,v 1.4 2006/01/23 18:39:32 tokul Exp $
* @package squirrelmail
* @subpackage i18n
*/
/**
* Class that uses parsed translation input objects
* @package squirrelmail
* @subpackage i18n
*/
class gettext_reader {
/**
* holds error code (0 if no error)
* @var integer
* @access public
*/
var $error = 0;
/**
* specifies the byte order: 0 low endian, 1 big endian
* @var integer
* @access private
*/
var $BYTEORDER = 0;
/**
* input object data
* @var object
* @access private
*/
var $STREAM = NULL;
/**
*
*/
function readint() {
// Reads 4 byte value from $FD and puts it in int
// $BYTEORDER specifies the byte order: 0 low endian, 1 big endian
for ($i=0; $i<4; $i++) {
$byte[$i]=ord($this->STREAM->read(1));
}
//print sprintf("pos: %d\n",$this->STREAM->currentpos());
if ($this->BYTEORDER == 0)
return (int)(($byte[0]) | ($byte[1]<<8) | ($byte[2]<<16) | ($byte[3]<<24));
else
return (int)(($byte[3]) | ($byte[2]<<8) | ($byte[1]<<16) | ($byte[0]<<24));
}
/**
* constructor that requires StreamReader object
* @param object $Reader
* @return boolean false, if some error with stream
*/
function gettext_reader($Reader) {
$MAGIC1 = (int) ((222) | (18<<8) | (4<<16) | (149<<24));
$MAGIC2 = (int) ((149) | (4<<8) | (18<<16) | (222<<24));
$this->STREAM = $Reader;
if ($this->STREAM->error>0) {
$this->error=1;
return false;
}
$magic = $this->readint();
if ($magic == $MAGIC1) {
$this->BYTEORDER = 0;
} elseif ($magic == $MAGIC2) {
$this->BYTEORDER = 1;
} else {
$this->error = 1; // not MO file
return false;
}
// FIXME: Do we care about revision? We should.
$revision = $this->readint();
$total = $this->readint();
$originals = $this->readint();
$translations = $this->readint();
$this->total = $total;
$this->originals = $originals;
$this->translations = $translations;
// Here we store already found translations
$this->_HASHED = array();
}
/**
* @param boolean $translations do translation have to be loaded
*/
function load_tables($translations=false) {
// if tables are loaded do not load them again
if (!isset($this->ORIGINALS)) {
$this->ORIGINALS = array();
$this->STREAM->seekto($this->originals);
for ($i=0; $i<$this->total; $i++) {
$len = $this->readint();
$ofs = $this->readint();
$this->ORIGINALS[] = array($len,$ofs);
}
}
// similar for translations
if ($translations and !isset($this->TRANSLATIONS)) {
$this->TRANSLATIONS = array();
$this->STREAM->seekto($this->translations);
for ($i=0; $i<$this->total; $i++) {
$len = $this->readint();
$ofs = $this->readint();
$this->TRANSLATIONS[] = array($len,$ofs);
}
}
}
/**
* get a string with particular number
* @param integer $num
* @return string untranslated string
*/
function get_string_number($num) {
// TODO: Add simple hashing [check array, add if not already there]
$this->load_tables();
$meta = $this->ORIGINALS[$num];
$length = $meta[0];
$offset = $meta[1];
$this->STREAM->seekto($offset);
$data = $this->STREAM->read($length);
return (string)$data;
}
/**
* get translated string with particular number
* @param integer $num
* @return string translated string
*/
function get_translation_number($num) {
// get a string with particular number
// TODO: Add simple hashing [check array, add if not already there]
$this->load_tables(true);
$meta = $this->TRANSLATIONS[$num];
$length = $meta[0];
$offset = $meta[1];
$this->STREAM->seekto($offset);
$data = $this->STREAM->read($length);
return (string)$data;
}
/**
* binary search for string
* @param string $string
* @param integer $start
* @param integer $end
*/
function find_string($string, $start,$end) {
//print "start: $start, end: $end\n";
// Simple hashing to improve speed
if (isset($this->_HASHED[$string])) return $this->_HASHED[$string];
if (abs($start-$end)<=1) {
// we're done, if it's not it, bye bye
$txt = $this->get_string_number($start);
if ($string == $txt) {
$this->_HASHED[$string] = $start;
return $start;
} else
return -1;
} elseif ($start>$end) {
return $this->find_string($string,$end,$start);
} else {
$half = (int)(($start+$end)/2);
$tst = $this->get_string_number($half);
$cmp = strcmp($string,$tst);
if ($cmp == 0) {
$this->_HASHED[$string] = $half;
return $half;
} elseif ($cmp<0)
return $this->find_string($string,$start,$half);
else
return $this->find_string($string,$half,$end);
}
}
/**
* translate string
* @param string $string English string
* @return string translated string
*/
function translate($string) {
if ($this->error > 0) return $string;
$num = $this->find_string($string, 0, $this->total);
if ($num == -1)
return $string;
else
return $this->get_translation_number($num);
}
/**
* extract plural forms header
* @return string plural-forms header string
*/
function get_plural_forms() {
// lets assume message number 0 is header
// this is true, right?
// cache header field for plural forms
if (isset($this->pluralheader) && is_string($this->pluralheader))
return $this->pluralheader;
else {
$header = $this->get_translation_number(0);
if (eregi("plural-forms: (.*)\n",$header,$regs)) {
$expr = $regs[1];
} else {
$expr = "nplurals=2; plural=n == 1 ? 0 : 1;";
}
$this->pluralheader = $expr;
return $expr;
}
}
/**
* find out the appropriate form number
* @param integer $n count
* @return integer
*/
function select_string($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 = 0;
return $plural;
}
/**
* translate string with singular/plural forms
* @param string $single English singural form of translation
* @param string $plural English plural form of translation
* @param string $number count
* @return string
*/
function ngettext($single, $plural, $number) {
if ($this->error > 0) {
$result=-1;
} else {
// find out the appropriate form
$select = $this->select_string($number);
// this should contains all strings separated by NULLs
$result = $this->find_string($single.chr(0).$plural,0,$this->total);
}
if ($result == -1) {
if ($number != 1) return $plural;
else return $single;
} else {
$result = $this->get_translation_number($result);
// lets try to parse all the NUL staff
//$result = "proba0".chr(0)."proba1".chr(0)."proba2";
$list = explode (chr(0), $result);
return $list[$select];
}
}
}
?>
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