<?php
/*
   Copyright (c) 2005 Steven Armstrong <sa at c-area dot ch>
   
   Drop in replacement for native gettext.
   
   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

*/
/*
LC_CTYPE		0
LC_NUMERIC	1
LC_TIME			2
LC_COLLATE	3
LC_MONETARY	4
LC_MESSAGES	5
LC_ALL			6
*/

require('streams.php');
require('gettext.php');


// Variables

global $text_domains, $default_domain, $LC_CATEGORIES, $EMULATEGETTEXT, $CURRENTLOCALE;
$text_domains = array();
$default_domain = 'messages';
$LC_CATEGORIES = array('LC_CTYPE', 'LC_NUMERIC', 'LC_TIME', 'LC_COLLATE', 'LC_MONETARY', 'LC_MESSAGES', 'LC_ALL');
$EMULATEGETTEXT = 0;
$CURRENTLOCALE = '';


// Utility functions

/**
 * Utility function to get a StreamReader for the given text domain.
 */
function _get_reader($domain=null, $category=5, $enable_cache=true) {
	global $text_domains, $default_domain, $LC_CATEGORIES;
	if (!isset($domain)) $domain = $default_domain;
	if (!isset($text_domains[$domain]->l10n)) {
		// get the current locale
		$locale = _setlocale(LC_MESSAGES, 0);
		$p = isset($text_domains[$domain]->path) ? $text_domains[$domain]->path : './';
		$path = $p . "$locale/". $LC_CATEGORIES[$category] ."/$domain.mo";
		if (file_exists($path)) {
			$input = new FileReader($path);
		}
		else {
			$input = null;
		}
		$text_domains[$domain]->l10n = new gettext_reader($input, $enable_cache);
	}
	return $text_domains[$domain]->l10n;
}

/**
 * Returns whether we are using our emulated gettext API or PHP built-in one.
 */
function locale_emulation() {
    global $EMULATEGETTEXT;
    return $EMULATEGETTEXT;
}

/**
 * Checks if the current locale is supported on this system.
 */
function _check_locale() {
    global $EMULATEGETTEXT;
    return !$EMULATEGETTEXT;
}

/**
 * Get the codeset for the given domain.
 */
function _get_codeset($domain=null) {
	global $text_domains, $default_domain, $LC_CATEGORIES;
	if (!isset($domain)) $domain = $default_domain;
	return (isset($text_domains[$domain]->codeset))? $text_domains[$domain]->codeset : ini_get('mbstring.internal_encoding');
}

/**
 * Convert the given string to the encoding set by bind_textdomain_codeset.
 */
function _encode($text) {
	$source_encoding = mb_detect_encoding($text);
	$target_encoding = _get_codeset();
	if ($source_encoding != $target_encoding) {
		return mb_convert_encoding($text, $target_encoding, $source_encoding);
	}
	else {
		return $text;
	}
}


// Custom implementation of the standard gettext related functions

/**
 * Sets a requested locale, if needed emulates it.
 */
function _setlocale($category, $locale) {
    global $CURRENTLOCALE, $EMULATEGETTEXT;
    if ($locale === 0) { // use === to differentiate between string "0"
        if ($CURRENTLOCALE != '') 
            return $CURRENTLOCALE;
        else 
            // obey LANG variable, maybe extend to support all of LC_* vars
            // even if we tried to read locale without setting it first
            return _setlocale($category, $CURRENTLOCALE);
    } else {
        $ret = 0;
        if (function_exists('setlocale')) // I don't know if this ever happens ;)
           $ret = setlocale($category, $locale);
        if (($ret and $locale == '') or ($ret == $locale)) {
            $EMULATEGETTEXT = 0;
            $CURRENTLOCALE = $ret;
        } else {
  	    if ($locale == '') // emulate variable support
 	        $CURRENTLOCALE = getenv('LANG');
	    else
	        $CURRENTLOCALE = $locale;
            $EMULATEGETTEXT = 1;
        }
        return $CURRENTLOCALE;
    }
}

/**
 * Sets the path for a domain.
 */
function _bindtextdomain($domain, $path) {
	global $text_domains;
	// ensure $path ends with a slash
	if ($path[strlen($path) - 1] != '/') $path .= '/';
	elseif ($path[strlen($path) - 1] != '\\') $path .= '\\';
	$text_domains[$domain]->path = $path;
}

/**
 * Specify the character encoding in which the messages from the DOMAIN message catalog will be returned.
 */
function _bind_textdomain_codeset($domain, $codeset) {
	global $text_domains;
	$text_domains[$domain]->codeset = $codeset;
}

/**
 * Sets the default domain.
 */
function _textdomain($domain) {
	global $default_domain;
	$default_domain = $domain;
}

/**
 * Lookup a message in the current domain.
 */
function _gettext($msgid) {
	$l10n = _get_reader();
	//return $l10n->translate($msgid);
	return _encode($l10n->translate($msgid));
}
/**
 * Alias for gettext.
 */
function __($msgid) {
	return _gettext($msgid);
}
/**
 * Plural version of gettext.
 */
function _ngettext($single, $plural, $number) {
	$l10n = _get_reader();
	//return $l10n->ngettext($single, $plural, $number);
	return _encode($l10n->ngettext($single, $plural, $number));
}

/**
 * Override the current domain.
 */
function _dgettext($domain, $msgid) {
	$l10n = _get_reader($domain);
	//return $l10n->translate($msgid);
	return _encode($l10n->translate($msgid));
}
/**
 * Plural version of dgettext.
 */
function _dngettext($domain, $single, $plural, $number) {
	$l10n = _get_reader($domain);
	//return $l10n->ngettext($single, $plural, $number);
	return _encode($l10n->ngettext($single, $plural, $number));
}

/**
 * Overrides the domain and category for a single lookup.
 */
function _dcgettext($domain, $msgid, $category) {
	$l10n = _get_reader($domain, $category);
	//return $l10n->translate($msgid);
	return _encode($l10n->translate($msgid));
}
/**
 * Plural version of dcgettext.
 */
function _dcngettext($domain, $single, $plural, $number, $category) {
	$l10n = _get_reader($domain, $category);
	//return $l10n->ngettext($single, $plural, $number);
	return _encode($l10n->ngettext($single, $plural, $number));
}


// Wrappers to use if the standard gettext functions are available, but the current locale is not supported by the system.
// Use the standard impl if the current locale is supported, use the custom impl otherwise.

function T_setlocale($category, $locale) {
    return _setlocale($category, $locale);
}

function T_bindtextdomain($domain, $path) {
	if (_check_locale()) return bindtextdomain($domain, $path);
	else return _bindtextdomain($domain, $path);
}
function T_bind_textdomain_codeset($domain, $codeset) {
    // bind_textdomain_codeset is available only in PHP 4.2.0+
	if (_check_locale() and function_exists('bind_textdomain_codeset')) return bind_textdomain_codeset($domain, $codeset);
	else return _bind_textdomain_codeset($domain, $codeset);
}
function T_textdomain($domain) {
	if (_check_locale()) return textdomain($domain);
	else return _textdomain($domain);
}
function T_gettext($msgid) {
	if (_check_locale()) return gettext($msgid);
	else return _gettext($msgid);
}
function T_($msgid) {
	if (_check_locale()) return _($msgid);
	return __($msgid);
}
function T_ngettext($single, $plural, $number) {
	if (_check_locale()) return ngettext($single, $plural, $number);
	else return _ngettext($single, $plural, $number);
}
function T_dgettext($domain, $msgid) {
	if (_check_locale()) return dgettext($domain, $msgid);
	else return _dgettext($domain, $msgid);
}
function T_dngettext($domain, $single, $plural, $number) {
	if (_check_locale()) return dngettext($domain, $single, $plural, $number);
	else return _dngettext($domain, $single, $plural, $number);
}
function T_dcgettext($domain, $msgid, $category) {
	if (_check_locale()) return dcgettext($domain, $msgid, $category);
	else return _dcgettext($domain, $msgid, $category);
}
function T_dcngettext($domain, $single, $plural, $number, $category) {
	if (_check_locale()) return dcngettext($domain, $single, $plural, $number, $category);
	else return _dcngettext($domain, $single, $plural, $number, $category);
}


// Wrappers used as a drop in replacement for the standard gettext functions

if (!function_exists('gettext')) {
	function bindtextdomain($domain, $path) {
		return _bindtextdomain($domain, $path);
	}
	function bind_textdomain_codeset($domain, $codeset) {
		return _bind_textdomain_codeset($domain, $codeset);
	}
	function textdomain($domain) {
		return _textdomain($domain);
	}
	function gettext($msgid) {
		return _gettext($msgid);
	}
	function _($msgid) {
		return __($msgid);
	}
	function ngettext($single, $plural, $number) {
		return _ngettext($single, $plural, $number);
	}
	function dgettext($domain, $msgid) {
		return _dgettext($domain, $msgid);
	}
	function dngettext($domain, $single, $plural, $number) {
		return _dngettext($domain, $single, $plural, $number);
	}
	function dcgettext($domain, $msgid, $category) {
		return _dcgettext($domain, $msgid, $category);
	}
	function dcngettext($domain, $single, $plural, $number, $category) {
		return _dcngettext($domain, $single, $plural, $number, $category);
	}
}

?>