<?php
/*
Copyright (c) 2005 Steven Armstrong <sa at c-area dot ch>
Copyright (c) 2009 Danilo Segan <danilo@kvota.net>

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
*/

// LC_MESSAGES is not available if php-gettext is not loaded
// while the other constants are already available from session extension.

defined('LC_MESSAGES') or define('LC_MESSAGES', 5);

require('inc/streams.php');
require('inc/gettext_reader.php');
require_once('gettext_conf.php');

// Variables

global $text_domains, $default_domain, $default_lang, $available_languages, $gt_conf, $LC_CATEGORIES, $EMULATEGETTEXT, $CURRENTLOCALE;
$text_domains = array();
$default_domain = $gt_conf['default_domain'];
$default_lang = $gt_conf['default_lang'];
$available_languages = $gt_conf['languages'];
$LC_CATEGORIES = array(
	'LC_CTYPE',
	'LC_NUMERIC',
	'LC_TIME',
	'LC_COLLATE',
	'LC_MONETARY',
	'LC_MESSAGES',
	'LC_ALL'
);
$EMULATEGETTEXT = 0;
$CURRENTLOCALE = '';
/* Class to hold a single domain included in $text_domains. */
class domain {
	var $l10n;
	var $path;
	var $codeset;
}

// Utility functions

/**
 *  Get the clients language from the browser
 */

function _get_client_language() {
	global $default_lang;
	if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
		$code = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
		$lang = find_by('code', $code) ?? find_by('folder', $default_lang);
	} else {
		$lang = find_by('folder', $default_lang);
	}
	return $lang;
}

/** 
 * Find the correct language by different parameters
 */

function find_by($field = 'folder', $match = 'english') {
	global $available_languages;
	foreach ($available_languages as $lang) {
		if (isset($lang[$field]) && $lang[$field] === $match) {
			return $lang;
		}
	}
	return NULL;
}

/**
 * Return a list of locales to try for any POSIX-style locale specification.
 */

function get_list_of_locales($locale) {
	/* Figure out all possible locale names and start with the most
	 * specific ones.  I.e. for sr_CS.UTF-8@latin, look through all of
	 * sr_CS.UTF-8@latin, sr_CS@latin, sr@latin, sr_CS.UTF-8, sr_CS, sr.
	 */
	$locale_names = array();
	$lang = NULL;
	$country = NULL;
	$charset = NULL;
	$modifier = NULL;
	if ($locale) {
		if (preg_match(
			"/^(?P<lang>[a-z]{2,3})" // language code
				. "(?:_(?P<country>[A-Z]{2}))?" // country code
				. "(?:\.(?P<charset>[-A-Za-z0-9_]+))?" // charset
				. "(?:@(?P<modifier>[-A-Za-z0-9_]+))?$/", // @ modifier
			$locale,
			$matches
		)) {
			if (isset($matches["lang"])) $lang = $matches["lang"];
			if (isset($matches["country"])) $country = $matches["country"];
			if (isset($matches["charset"])) $charset = $matches["charset"];
			if (isset($matches["modifier"])) $modifier = $matches["modifier"];
			if ($modifier) {
				if ($country) {
					if ($charset) array_push($locale_names, $lang . "_" . $country . "." . $charset . "@" . $modifier);
					array_push($locale_names, $lang . "_" . $country . "@" . $modifier);
				} elseif ($charset) {
					array_push($locale_names, $lang . "." . $charset . "@" . $modifier);
				}
				array_push($locale_names, $lang . "@" . $modifier);
			}

			if ($country) {
				if ($charset) array_push($locale_names, $lang . "_" . $country . "." . $charset);
				array_push($locale_names, $lang . "_" . $country);
			} elseif ($charset) {
				array_push($locale_names, $lang . "." . $charset);
			}
			array_push($locale_names, $lang);
		}

		// If the locale name doesn't match POSIX style, just include it as-is.
		if (!in_array($locale, $locale_names)) {
			array_push($locale_names, $locale);
		}
	}

	return $locale_names;
}

/**
 * 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);
		// $bound_path = isset($text_domains[$domain]->path) ? $text_domains[$domain]->path : '/'; 
		$subpath = $LC_CATEGORIES[$category] . "/$domain.mo";
		$locale_names = get_list_of_locales($locale);
		$input = null;
		foreach ($locale_names as $locale) {
			$is_en = false;
			if (strpos($locale, 'en') === 0) {
				$is_en = true;
			}
			$base_path = __DIR__ . '/locale/' . $locale . '/' . $subpath;
			$full_path = realpath($base_path);
			// error_log("Fullpath: ".$full_path);
			if (file_exists($full_path)) {
				$input = new FileReader($full_path);
				break;
			} else {
				if (!$is_en) {
					error_log("Language Path '" . $locale . "' does not exist. _get_reader() in gettext.php");
					error_log("Called path: " . $full_path);
				}
			}
		}

		if (!array_key_exists($domain, $text_domains)) {

			// Initialize an empty domain object.

			$text_domains[$domain] = new domain();
		}

		$text_domains[$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_and_function($function = false) {
	global $EMULATEGETTEXT;
	if ($function and !function_exists($function)) return false;
	return !$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) {
	$target_encoding = _get_codeset();
	if ($target_encoding == "") {
		$target_encoding = "UTF-8";
	}
	if (function_exists("mb_detect_encoding")) {
		$source_encoding = mb_detect_encoding($text);
		if ($source_encoding != $target_encoding) $text = mb_convert_encoding($text, $target_encoding, $source_encoding);
	}

	return $text;
}

// Custom implementation of the standard gettext related functions

/**
 * Returns passed in $locale, or environment variable $LANG if $locale == ''.
 */

function _get_default_locale($locale) {
	if ($locale == '') // emulate variable support
		return getenv('LANG');
	else return $locale;
}

/**
 * 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 {
		if (function_exists('setlocale')) {
			$ret = setlocale($category, $locale);
			if (($locale == '' and !$ret) or // failed setting it by env
				($locale != '' and $ret != $locale)
			) { // failed setting it

				// Failed setting it according to environment.

				$CURRENTLOCALE = _get_default_locale($locale);
				$EMULATEGETTEXT = 1;
			} else {
				$CURRENTLOCALE = $ret;
				$EMULATEGETTEXT = 0;
			}
		} else {

			// No function setlocale(), emulate it all.

			$CURRENTLOCALE = _get_default_locale($locale);
			$EMULATEGETTEXT = 1;
		}

		// Allow locale to be changed on the go for one translation domain.

		global $text_domains, $default_domain;
		if (array_key_exists($default_domain, $text_domains)) {
			unset($text_domains[$default_domain]->l10n);
		}

		return $CURRENTLOCALE;
	}
}

/**
 * Sets the path for a domain.
 */

function _bindtextdomain($domain, $path) {
	global $text_domains;

	// ensure $path ends with a slash ('/' should work for both, but lets still play nice)

	if (substr(php_uname(), 0, 7) == "Windows") {
		if ($path[strlen($path) - 1] != '\\' and $path[strlen($path) - 1] != '/') $path .= '\\';
	} else {
		if ($path[strlen($path) - 1] != '/') $path .= '/';
	}

	if (!array_key_exists($domain, $text_domains)) {

		// Initialize an empty domain object.

		$text_domains[$domain] = new domain();
	}

	$text_domains[$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) {
	$l10n = _get_reader();
	return _encode($l10n->translate($msgid));
}

/**
 * Alias for gettext.
 */

function __($msgid) {
	return _gettext($msgid);
}

/**
 * Plural version of gettext.
 */

function _ngettext($singular, $plural, $number) {
	$l10n = _get_reader();
	return _encode($l10n->ngettext($singular, $plural, $number));
}

/**
 * Override the current domain.
 */

function _dgettext($domain, $msgid) {
	$l10n = _get_reader($domain);
	return _encode($l10n->translate($msgid));
}

/**
 * Plural version of dgettext.
 */

function _dngettext($domain, $singular, $plural, $number) {
	$l10n = _get_reader($domain);
	return _encode($l10n->ngettext($singular, $plural, $number));
}

/**
 * Overrides the domain and category for a single lookup.
 */

function _dcgettext($domain, $msgid, $category) {
	$l10n = _get_reader($domain, $category);
	return _encode($l10n->translate($msgid));
}

/**
 * Plural version of dcgettext.
 */

function _dcngettext($domain, $singular, $plural, $number, $category) {
	$l10n = _get_reader($domain, $category);
	return _encode($l10n->ngettext($singular, $plural, $number));
}

/**
 * Context version of gettext.
 */

function _pgettext($context, $msgid) {
	$l10n = _get_reader();
	return _encode($l10n->pgettext($context, $msgid));
}

/**
 * Override the current domain in a context gettext call.
 */

function _dpgettext($domain, $context, $msgid) {
	$l10n = _get_reader($domain);
	return _encode($l10n->pgettext($context, $msgid));
}

/**
 * Overrides the domain and category for a single context-based lookup.
 */

function _dcpgettext($domain, $context, $msgid, $category) {
	$l10n = _get_reader($domain, $category);
	return _encode($l10n->pgettext($context, $msgid));
}

/**
 * Context version of ngettext.
 */

function _npgettext($context, $singular, $plural) {
	$l10n = _get_reader();
	return _encode($l10n->npgettext($context, $singular, $plural));
}

/**
 * Override the current domain in a context ngettext call.
 */

function _dnpgettext($domain, $context, $singular, $plural) {
	$l10n = _get_reader($domain);
	return _encode($l10n->npgettext($context, $singular, $plural));
}

/**
 * Overrides the domain and category for a plural context-based lookup.
 */

function _dcnpgettext($domain, $context, $singular, $plural, $category) {
	$l10n = _get_reader($domain, $category);
	return _encode($l10n->npgettext($context, $singular, $plural));
}

// 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, $path) {
	if (_check_locale_and_function()) return bindtextdomain($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('bind_textdomain_codeset')) return bind_textdomain_codeset($domain, $codeset);
	else return _bind_textdomain_codeset($domain, $codeset);
}

function T_textdomain($domain) {
	if (_check_locale_and_function()) return textdomain($domain);
	else return _textdomain($domain);
}

function T_gettext($msgid) {
	if (_check_locale_and_function()) return gettext($msgid);
	else return _gettext($msgid);
}

function T_($msgid) {
	if (_check_locale_and_function()) return _($msgid);
	return __($msgid);
}

function T_ngettext($singular, $plural, $number) {
	if (_check_locale_and_function()) return ngettext($singular, $plural, $number);
	else return _ngettext($singular, $plural, $number);
}

function T_dgettext($domain, $msgid) {
	if (_check_locale_and_function()) return dgettext($domain, $msgid);
	else return _dgettext($domain, $msgid);
}

function T_dngettext($domain, $singular, $plural, $number) {
	if (_check_locale_and_function()) return dngettext($domain, $singular, $plural, $number);
	else return _dngettext($domain, $singular, $plural, $number);
}

function T_dcgettext($domain, $msgid, $category) {
	if (_check_locale_and_function()) return dcgettext($domain, $msgid, $category);
	else return _dcgettext($domain, $msgid, $category);
}

function T_dcngettext($domain, $singular, $plural, $number, $category) {
	if (_check_locale_and_function()) return dcngettext($domain, $singular, $plural, $number, $category);
	else return _dcngettext($domain, $singular, $plural, $number, $category);
}

function T_pgettext($context, $msgid) {
	if (_check_locale_and_function('pgettext')) return pgettext($context, $msgid);
	else return _pgettext($context, $msgid);
}

function T_dpgettext($domain, $context, $msgid) {
	if (_check_locale_and_function('dpgettext')) return dpgettext($domain, $context, $msgid);
	else return _dpgettext($domain, $context, $msgid);
}

function T_dcpgettext($domain, $context, $msgid, $category) {
	if (_check_locale_and_function('dcpgettext')) return dcpgettext($domain, $context, $msgid, $category);
	else return _dcpgettext($domain, $context, $msgid, $category);
}

function T_npgettext($context, $singular, $plural, $number) {
	if (_check_locale_and_function('npgettext')) return npgettext($context, $singular, $plural, $number);
	else return _npgettext($context, $singular, $plural, $number);
}

function T_dnpgettext($domain, $context, $singular, $plural, $number) {
	if (_check_locale_and_function('dnpgettext')) return dnpgettext($domain, $context, $singular, $plural, $number);
	else return _dnpgettext($domain, $context, $singular, $plural, $number);
}

function T_dcnpgettext($domain, $context, $singular, $plural, $number, $category) {
	if (_check_locale_and_function('dcnpgettext')) return dcnpgettext($domain, $context, $singular, $plural, $number, $category);
	else return _dcnpgettext($domain, $context, $singular, $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($singular, $plural, $number) {
		return _ngettext($singular, $plural, $number);
	}

	function dgettext($domain, $msgid) {
		return _dgettext($domain, $msgid);
	}

	function dngettext($domain, $singular, $plural, $number) {
		return _dngettext($domain, $singular, $plural, $number);
	}

	function dcgettext($domain, $msgid, $category) {
		return _dcgettext($domain, $msgid, $category);
	}

	function dcngettext($domain, $singular, $plural, $number, $category) {
		return _dcngettext($domain, $singular, $plural, $number, $category);
	}

	function pgettext($context, $msgid) {
		return _pgettext($context, $msgid);
	}

	function npgettext($context, $singular, $plural, $number) {
		return _npgettext($context, $singular, $plural, $number);
	}

	function dpgettext($domain, $context, $msgid) {
		return _dpgettext($domain, $context, $msgid);
	}

	function dnpgettext($domain, $context, $singular, $plural, $number) {
		return _dnpgettext($domain, $context, $singular, $plural, $number);
	}

	function dcpgettext($domain, $context, $msgid, $category) {
		return _dcpgettext($domain, $context, $msgid, $category);
	}

	function dcnpgettext($domain, $context, $singular, $plural, $number, $category) {
		return _dcnpgettext($domain, $context, $singular, $plural, $number, $category);
	}
}
