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432 lines
12 KiB
432 lines
12 KiB
<?php
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/*
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Copyright (c) 2003, 2009 Danilo Segan <[email protected]>.
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Copyright (c) 2005 Nico Kaiser <[email protected]>
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This file is part of PHP-gettext.
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PHP-gettext 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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PHP-gettext 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
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along with PHP-gettext; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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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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* The files are passed to gettext_reader as a Stream (see streams.php)
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*
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* This version has the ability to cache all strings and translations to
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* speed up the string lookup.
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* While the cache is enabled by default, it can be switched off with the
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* second parameter in the constructor (e.g. whenusing very large MO files
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* that you don't want to keep in memory)
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*/
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class gettext_reader {
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//public:
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var $error = 0; // public variable that holds error code (0 if no error)
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//private:
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var $BYTEORDER = 0; // 0: low endian, 1: big endian
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var $STREAM = NULL;
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var $short_circuit = false;
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var $enable_cache = false;
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var $originals = NULL; // offset of original table
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var $translations = NULL; // offset of translation table
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var $pluralheader = NULL; // cache header field for plural forms
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var $total = 0; // total string count
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var $table_originals = NULL; // table for original strings (offsets)
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var $table_translations = NULL; // table for translated strings (offsets)
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var $cache_translations = NULL; // original -> translation mapping
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/* Methods */
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/**
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* Reads a 32bit Integer from the Stream
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*
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* @access private
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* @return Integer from the Stream
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*/
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function readint() {
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if ($this->BYTEORDER == 0) {
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// low endian
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$input=unpack('V', $this->STREAM->read(4));
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return array_shift($input);
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} else {
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// big endian
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$input=unpack('N', $this->STREAM->read(4));
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return array_shift($input);
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}
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}
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function read($bytes) {
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return $this->STREAM->read($bytes);
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}
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/**
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* Reads an array of Integers from the Stream
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*
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* @param int count How many elements should be read
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* @return Array of Integers
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*/
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function readintarray($count) {
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if ($this->BYTEORDER == 0) {
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// low endian
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return unpack('V'.$count, $this->STREAM->read(4 * $count));
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} else {
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// big endian
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return unpack('N'.$count, $this->STREAM->read(4 * $count));
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}
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}
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/**
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* Constructor
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*
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* @param object Reader the StreamReader object
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* @param boolean enable_cache Enable or disable caching of strings (default on)
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*/
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function gettext_reader($Reader, $enable_cache = true) {
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// If there isn't a StreamReader, turn on short circuit mode.
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if (! $Reader || isset($Reader->error) ) {
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$this->short_circuit = true;
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return;
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}
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// Caching can be turned off
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$this->enable_cache = $enable_cache;
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$MAGIC1 = "\x95\x04\x12\xde";
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$MAGIC2 = "\xde\x12\x04\x95";
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$this->STREAM = $Reader;
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$magic = $this->read(4);
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if ($magic == $MAGIC1) {
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$this->BYTEORDER = 1;
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} elseif ($magic == $MAGIC2) {
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$this->BYTEORDER = 0;
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} else {
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$this->error = 1; // not MO file
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return false;
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}
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// FIXME: Do we care about revision? We should.
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$revision = $this->readint();
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$this->total = $this->readint();
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$this->originals = $this->readint();
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$this->translations = $this->readint();
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}
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/**
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* Loads the translation tables from the MO file into the cache
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* If caching is enabled, also loads all strings into a cache
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* to speed up translation lookups
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*
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* @access private
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*/
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function load_tables() {
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if (is_array($this->cache_translations) &&
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is_array($this->table_originals) &&
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is_array($this->table_translations))
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return;
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/* get original and translations tables */
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if (!is_array($this->table_originals)) {
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$this->STREAM->seekto($this->originals);
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$this->table_originals = $this->readintarray($this->total * 2);
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}
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if (!is_array($this->table_translations)) {
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$this->STREAM->seekto($this->translations);
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$this->table_translations = $this->readintarray($this->total * 2);
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}
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if ($this->enable_cache) {
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$this->cache_translations = array ();
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/* read all strings in the cache */
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for ($i = 0; $i < $this->total; $i++) {
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$this->STREAM->seekto($this->table_originals[$i * 2 + 2]);
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$original = $this->STREAM->read($this->table_originals[$i * 2 + 1]);
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$this->STREAM->seekto($this->table_translations[$i * 2 + 2]);
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$translation = $this->STREAM->read($this->table_translations[$i * 2 + 1]);
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$this->cache_translations[$original] = $translation;
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}
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}
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}
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/**
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* Returns a string from the "originals" table
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*
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* @access private
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* @param int num Offset number of original string
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* @return string Requested string if found, otherwise ''
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*/
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function get_original_string($num) {
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$length = $this->table_originals[$num * 2 + 1];
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$offset = $this->table_originals[$num * 2 + 2];
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if (! $length)
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return '';
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$this->STREAM->seekto($offset);
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$data = $this->STREAM->read($length);
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return (string)$data;
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}
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/**
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* Returns a string from the "translations" table
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*
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* @access private
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* @param int num Offset number of original string
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* @return string Requested string if found, otherwise ''
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*/
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function get_translation_string($num) {
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$length = $this->table_translations[$num * 2 + 1];
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$offset = $this->table_translations[$num * 2 + 2];
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if (! $length)
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return '';
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$this->STREAM->seekto($offset);
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$data = $this->STREAM->read($length);
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return (string)$data;
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}
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/**
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* Binary search for string
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*
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* @access private
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* @param string string
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* @param int start (internally used in recursive function)
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* @param int end (internally used in recursive function)
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* @return int string number (offset in originals table)
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*/
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function find_string($string, $start = -1, $end = -1) {
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if (($start == -1) or ($end == -1)) {
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// find_string is called with only one parameter, set start end end
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$start = 0;
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$end = $this->total;
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}
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if (abs($start - $end) <= 1) {
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// We're done, now we either found the string, or it doesn't exist
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$txt = $this->get_original_string($start);
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if ($string == $txt)
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return $start;
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else
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return -1;
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} else if ($start > $end) {
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// start > end -> turn around and start over
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return $this->find_string($string, $end, $start);
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} else {
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// Divide table in two parts
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$half = (int)(($start + $end) / 2);
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$cmp = strcmp($string, $this->get_original_string($half));
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if ($cmp == 0)
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// string is exactly in the middle => return it
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return $half;
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else if ($cmp < 0)
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// The string is in the upper half
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return $this->find_string($string, $start, $half);
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else
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// The string is in the lower half
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return $this->find_string($string, $half, $end);
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}
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}
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/**
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* Translates a string
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*
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* @access public
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* @param string string to be translated
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* @return string translated string (or original, if not found)
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*/
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function translate($string) {
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if ($this->short_circuit)
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return $string;
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$this->load_tables();
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if ($this->enable_cache) {
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// Caching enabled, get translated string from cache
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if (array_key_exists($string, $this->cache_translations))
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return $this->cache_translations[$string];
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else
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return $string;
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} else {
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// Caching not enabled, try to find string
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$num = $this->find_string($string);
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if ($num == -1)
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return $string;
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else
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return $this->get_translation_string($num);
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}
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}
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/**
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* Sanitize plural form expression for use in PHP eval call.
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*
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* @access private
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* @return string sanitized plural form expression
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*/
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function sanitize_plural_expression($expr) {
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// Get rid of disallowed characters.
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$expr = preg_replace('@[^a-zA-Z0-9_:;\(\)\?\|\&=!<>+*/\%-]@', '', $expr);
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// Add parenthesis for tertiary '?' operator.
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$expr .= ';';
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$res = '';
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$p = 0;
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for ($i = 0; $i < strlen($expr); $i++) {
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$ch = $expr[$i];
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switch ($ch) {
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case '?':
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$res .= ' ? (';
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$p++;
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break;
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case ':':
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$res .= ') : (';
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break;
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case ';':
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$res .= str_repeat( ')', $p) . ';';
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$p = 0;
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break;
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default:
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$res .= $ch;
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}
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}
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return $res;
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}
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/**
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* Parse full PO header and extract only plural forms line.
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*
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* @access private
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* @return string verbatim plural form header field
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*/
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function extract_plural_forms_header_from_po_header($header) {
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if (preg_match("/(^|\n)plural-forms: ([^\n]*)\n/i", $header, $regs))
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$expr = $regs[2];
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else
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$expr = "nplurals=2; plural=n == 1 ? 0 : 1;";
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return $expr;
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}
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/**
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* Get possible plural forms from MO header
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*
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* @access private
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* @return string plural form header
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*/
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function get_plural_forms() {
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// lets assume message number 0 is header
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// this is true, right?
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$this->load_tables();
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// cache header field for plural forms
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if (! is_string($this->pluralheader)) {
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if ($this->enable_cache) {
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$header = $this->cache_translations[""];
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} else {
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$header = $this->get_translation_string(0);
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}
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$expr = $this->extract_plural_forms_header_from_po_header($header);
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$this->pluralheader = $this->sanitize_plural_expression($expr);
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}
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return $this->pluralheader;
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}
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/**
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* Detects which plural form to take
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*
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* @access private
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* @param n count
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* @return int array index of the right plural form
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*/
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function select_string($n) {
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$string = $this->get_plural_forms();
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$string = str_replace('nplurals',"\$total",$string);
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$string = str_replace("n",$n,$string);
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$string = str_replace('plural',"\$plural",$string);
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$total = 0;
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$plural = 0;
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eval("$string");
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if ($plural >= $total) $plural = $total - 1;
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return $plural;
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}
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/**
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* Plural version of gettext
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*
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* @access public
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* @param string single
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* @param string plural
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* @param string number
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* @return translated plural form
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*/
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function ngettext($single, $plural, $number) {
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if ($this->short_circuit) {
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if ($number != 1)
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return $plural;
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else
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return $single;
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}
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// find out the appropriate form
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$select = $this->select_string($number);
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// this should contains all strings separated by NULLs
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$key = $single . chr(0) . $plural;
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if ($this->enable_cache) {
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if (! array_key_exists($key, $this->cache_translations)) {
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return ($number != 1) ? $plural : $single;
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} else {
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$result = $this->cache_translations[$key];
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$list = explode(chr(0), $result);
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return $list[$select];
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}
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} else {
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$num = $this->find_string($key);
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if ($num == -1) {
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return ($number != 1) ? $plural : $single;
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} else {
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$result = $this->get_translation_string($num);
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$list = explode(chr(0), $result);
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return $list[$select];
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}
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}
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}
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function pgettext($context, $msgid) {
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$key = $context . chr(4) . $msgid;
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$ret = $this->translate($key);
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if (strpos($ret, "\004") !== FALSE) {
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return $msgid;
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} else {
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return $ret;
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}
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}
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function npgettext($context, $singular, $plural, $number) {
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$key = $context . chr(4) . $singular;
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$ret = $this->ngettext($key, $plural, $number);
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if (strpos($ret, "\004") !== FALSE) {
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return $singular;
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} else {
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return $ret;
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}
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}
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}
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?>
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