376 lines
10 KiB
PHP
Executable File
376 lines
10 KiB
PHP
Executable File
<?php
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/*
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Copyright (c) 2003, 2009 Danilo Segan <danilo@kvota.net>.
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Copyright (c) 2005 Nico Kaiser <nico@siriux.net>
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Copyright (c) 2016 Michal Čihař <michal@cihar.com>
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This file is part of MoTranslator.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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namespace PhpMyAdmin\MoTranslator;
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use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
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/**
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* Provides a simple gettext replacement that works independently from
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* the system's gettext abilities.
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* It can read MO files and use them for translating strings.
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*
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* It caches ll strings and translations to speed up the string lookup.
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*/
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class Translator
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{
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/**
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* None error.
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*/
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const ERROR_NONE = 0;
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/**
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* File does not exist.
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*/
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const ERROR_DOES_NOT_EXIST = 1;
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/**
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* File has bad magic number.
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*/
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const ERROR_BAD_MAGIC = 2;
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/**
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* Error while reading file, probably too short.
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*/
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const ERROR_READING = 3;
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/**
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* Big endian mo file magic bytes.
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*/
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const MAGIC_BE = "\x95\x04\x12\xde";
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/**
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* Little endian mo file magic bytes.
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*/
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const MAGIC_LE = "\xde\x12\x04\x95";
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/**
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* Parse error code (0 if no error).
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*
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* @var int
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*/
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public $error = self::ERROR_NONE;
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/**
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* Cache header field for plural forms.
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*
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* @var string|null
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*/
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private $pluralequation = null;
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/**
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* @var ExpressionLanguage|null Evaluator for plurals
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*/
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private $pluralexpression = null;
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/**
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* @var int|null number of plurals
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*/
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private $pluralcount = null;
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/**
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* Array with original -> translation mapping.
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*
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* @var array
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*/
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private $cache_translations = array();
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/**
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* Constructor.
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*
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* @param string $filename Name of mo file to load
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*/
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public function __construct($filename)
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{
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if (!is_readable($filename)) {
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$this->error = self::ERROR_DOES_NOT_EXIST;
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return;
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}
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$stream = new StringReader($filename);
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try {
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$magic = $stream->read(0, 4);
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if (strcmp($magic, self::MAGIC_LE) == 0) {
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$unpack = 'V';
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} elseif (strcmp($magic, self::MAGIC_BE) == 0) {
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$unpack = 'N';
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} else {
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$this->error = self::ERROR_BAD_MAGIC;
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return;
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}
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/* Parse header */
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$total = $stream->readint($unpack, 8);
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$originals = $stream->readint($unpack, 12);
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$translations = $stream->readint($unpack, 16);
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/* get original and translations tables */
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$table_originals = $stream->readintarray($unpack, $originals, $total * 2);
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$table_translations = $stream->readintarray($unpack, $translations, $total * 2);
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/* read all strings to the cache */
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for ($i = 0; $i < $total; ++$i) {
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$original = $stream->read($table_originals[$i * 2 + 2], $table_originals[$i * 2 + 1]);
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$translation = $stream->read($table_translations[$i * 2 + 2], $table_translations[$i * 2 + 1]);
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$this->cache_translations[$original] = $translation;
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}
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} catch (ReaderException $e) {
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$this->error = self::ERROR_READING;
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return;
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}
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}
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/**
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* Translates a string.
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*
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* @param string $msgid String to be translated
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*
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* @return string translated string (or original, if not found)
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*/
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public function gettext($msgid)
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{
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if (array_key_exists($msgid, $this->cache_translations)) {
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return $this->cache_translations[$msgid];
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}
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return $msgid;
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}
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/**
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* Check if a string is translated.
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*
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* @param string $msgid String to be checked
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*
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* @return bool
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*/
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public function exists($msgid)
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{
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return array_key_exists($msgid, $this->cache_translations);
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}
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/**
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* Sanitize plural form expression for use in ExpressionLanguage.
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*
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* @param string $expr Expression to sanitize
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*
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* @return string sanitized plural form expression
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*/
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public static function sanitizePluralExpression($expr)
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{
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// Parse equation
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$expr = explode(';', $expr);
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if (count($expr) >= 2) {
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$expr = $expr[1];
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} else {
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$expr = $expr[0];
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}
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$expr = trim(strtolower($expr));
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// Strip plural prefix
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if (substr($expr, 0, 6) === 'plural') {
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$expr = ltrim(substr($expr, 6));
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}
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// Strip equals
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if (substr($expr, 0, 1) === '=') {
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$expr = ltrim(substr($expr, 1));
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}
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// Cleanup from unwanted chars
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$expr = preg_replace('@[^n0-9:\(\)\?=!<>/%&| ]@', '', $expr);
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return $expr;
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}
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/**
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* Extracts number of plurals from plurals form expression.
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*
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* @param string $expr Expression to process
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*
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* @return int Total number of plurals
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*/
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public static function extractPluralCount($expr)
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{
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$parts = explode(';', $expr, 2);
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$nplurals = explode('=', trim($parts[0]), 2);
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if (strtolower(rtrim($nplurals[0])) != 'nplurals') {
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return 1;
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}
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if (count($nplurals) == 1) {
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return 1;
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}
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return intval($nplurals[1]);
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}
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/**
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* Parse full PO header and extract only plural forms line.
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*
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* @param string $header Gettext header
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*
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* @return string verbatim plural form header field
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*/
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public static function extractPluralsForms($header)
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{
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$headers = explode("\n", $header);
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$expr = 'nplurals=2; plural=n == 1 ? 0 : 1;';
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foreach ($headers as $header) {
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if (stripos($header, 'Plural-Forms:') === 0) {
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$expr = substr($header, 13);
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}
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}
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return $expr;
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}
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/**
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* Get possible plural forms from MO header.
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*
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* @return string plural form header
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*/
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private function getPluralForms()
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{
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// lets assume message number 0 is header
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// this is true, right?
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// cache header field for plural forms
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if (is_null($this->pluralequation)) {
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if (isset($this->cache_translations[''])) {
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$header = $this->cache_translations[''];
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} else {
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$header = '';
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}
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$expr = $this->extractPluralsForms($header);
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$this->pluralequation = $this->sanitizePluralExpression($expr);
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$this->pluralcount = $this->extractPluralCount($expr);
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}
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return $this->pluralequation;
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}
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/**
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* Detects which plural form to take.
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*
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* @param int $n count of objects
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*
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* @return int array index of the right plural form
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*/
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private function selectString($n)
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{
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if (is_null($this->pluralexpression)) {
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$this->pluralexpression = new ExpressionLanguage();
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}
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try {
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$plural = $this->pluralexpression->evaluate(
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$this->getPluralForms(), array('n' => $n)
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);
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} catch (\Exception $e) {
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$plural = 0;
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}
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if ($plural >= $this->pluralcount) {
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$plural = $this->pluralcount - 1;
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}
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return $plural;
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}
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/**
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* Plural version of gettext.
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*
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* @param string $msgid Single form
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* @param string $msgidPlural Plural form
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* @param int $number Number of objects
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*
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* @return string translated plural form
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*/
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public function ngettext($msgid, $msgidPlural, $number)
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{
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// this should contains all strings separated by NULLs
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$key = implode(chr(0), array($msgid, $msgidPlural));
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if (!array_key_exists($key, $this->cache_translations)) {
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return ($number != 1) ? $msgidPlural : $msgid;
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}
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// find out the appropriate form
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$select = $this->selectString($number);
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$result = $this->cache_translations[$key];
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$list = explode(chr(0), $result);
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if (!isset($list[$select])) {
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return $list[0];
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}
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return $list[$select];
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}
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/**
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* Translate with context.
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*
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* @param string $msgctxt Context
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* @param string $msgid String to be translated
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*
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* @return string translated plural form
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*/
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public function pgettext($msgctxt, $msgid)
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{
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$key = implode(chr(4), array($msgctxt, $msgid));
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$ret = $this->gettext($key);
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if (strpos($ret, chr(4)) !== false) {
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return $msgid;
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}
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return $ret;
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}
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/**
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* Plural version of pgettext.
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*
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* @param string $msgctxt Context
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* @param string $msgid Single form
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* @param string $msgidPlural Plural form
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* @param int $number Number of objects
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*
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* @return string translated plural form
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*/
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public function npgettext($msgctxt, $msgid, $msgidPlural, $number)
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{
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$key = implode(chr(4), array($msgctxt, $msgid));
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$ret = $this->ngettext($key, $msgidPlural, $number);
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if (strpos($ret, chr(4)) !== false) {
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return $msgid;
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}
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return $ret;
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}
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/**
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* Set translation in place
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*
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* @param string $msgid String to be set
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* @param string $msgstr Translation
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*
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* @return void
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*/
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public function setTranslation($msgid, $msgstr)
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{
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$this->cache_translations[$msgid] = $msgstr;
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}
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}
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