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-<?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 */
- if (!is_array($this->table_originals)) {
- $this->STREAM->seekto($this->originals);
- $this->table_originals = $this->readintarray($this->total * 2);
- }
- if (!is_array($this->table_translations)) {
- $this->STREAM->seekto($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];
- }
- }
- }
-
- function pgettext($context, $msgid) {
- $key = $context . chr(4) . $msgid;
- $ret = $this->translate($key);
- if (strpos($ret, "\004") !== FALSE) {
- return $msgid;
- } else {
- return $ret;
- }
- }
-
- function npgettext($context, $singular, $plural, $number) {
- $key = $context . chr(4) . $singular;
- $ret = $this->ngettext($key, $plural, $number);
- if (strpos($ret, "\004") !== FALSE) {
- return $singular;
- } else {
- return $ret;
- }
-
- }
-}
-
-?>
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