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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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