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<?php
/**
* Copyright 2014-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @category Horde
* @copyright 2014-2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package Util
*/
/**
* Provides utility methods used to transliterate a string.
*
* @author Michael Slusarz <slusarz@horde.org>
* @author Jan Schneider <jan@horde.org>
* @category Horde
* @copyright 2014-2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package Util
* @since 2.4.0
*/
class Horde_String_Transliterate
{
/**
* Transliterate mapping cache.
*
* @var array
*/
protected static $_map;
/**
* Transliterator instance.
*
* @var Transliterator
*/
protected static $_transliterator;
/**
* Transliterates an UTF-8 string to ASCII, replacing non-English
* characters to their English equivalents.
*
* Note: there is no guarantee that the output string will be ASCII-only,
* since any non-ASCII character not in the transliteration list will
* be ignored.
*
* @param string $str Input string (UTF-8).
*
* @return string Transliterated string (UTF-8).
*/
public static function toAscii($str)
{
$methods = array(
'_intlToAscii',
'_iconvToAscii',
'_fallbackToAscii'
);
foreach ($methods as $val) {
if (($out = call_user_func(array(__CLASS__, $val), $str)) !== false) {
return $out;
}
}
return $str;
}
/**
* Transliterate using the Transliterator package.
*
* @param string $str Input string (UTF-8).
*
* @return mixed Transliterated string (UTF-8), or false on error.
*/
protected static function _intlToAscii($str)
{
if (class_exists('Transliterator')) {
if (!isset(self::$_transliterator)) {
self::$_transliterator = Transliterator::create(
'Any-Latin; Latin-ASCII'
);
}
if (!is_null(self::$_transliterator)) {
/* Returns false on error. */
return self::$_transliterator->transliterate($str);
}
}
return false;
}
/**
* Transliterate using the iconv extension.
*
* @param string $str Input string (UTF-8).
*
* @return mixed Transliterated string (UTF-8), or false on error.
*/
protected static function _iconvToAscii($str)
{
return extension_loaded('iconv')
/* Returns false on error. */
? iconv('UTF-8', 'ASCII//TRANSLIT', $str)
: false;
}
/**
* Transliterate using a built-in ASCII mapping.
*
* @param string $str Input string (UTF-8).
*
* @return string Transliterated string (UTF-8).
*/
protected static function _fallbackToAscii($str)
{
if (!isset(self::$_map)) {
self::$_map = array(
'À' => 'A',
'Á' => 'A',
'Â' => 'A',
'Ã' => 'A',
'Ä' => 'A',
'Å' => 'A',
'Æ' => 'AE',
'à' => 'a',
'á' => 'a',
'â' => 'a',
'ã' => 'a',
'ä' => 'a',
'å' => 'a',
'æ' => 'ae',
'Þ' => 'TH',
'þ' => 'th',
'Ç' => 'C',
'ç' => 'c',
'Ð' => 'D',
'ð' => 'd',
'È' => 'E',
'É' => 'E',
'Ê' => 'E',
'Ë' => 'E',
'è' => 'e',
'é' => 'e',
'ê' => 'e',
'ë' => 'e',
'ƒ' => 'f',
'Ì' => 'I',
'Í' => 'I',
'Î' => 'I',
'Ï' => 'I',
'ì' => 'i',
'í' => 'i',
'î' => 'i',
'ï' => 'i',
'Ñ' => 'N',
'ñ' => 'n',
'Ò' => 'O',
'Ó' => 'O',
'Ô' => 'O',
'Õ' => 'O',
'Ö' => 'O',
'Ø' => 'O',
'ò' => 'o',
'ó' => 'o',
'ô' => 'o',
'õ' => 'o',
'ö' => 'o',
'ø' => 'o',
'Š' => 'S',
'ẞ' => 'SS',
'ß' => 'ss',
'š' => 's',
'ś' => 's',
'Ù' => 'U',
'Ú' => 'U',
'Û' => 'U',
'Ü' => 'U',
'ù' => 'u',
'ú' => 'u',
'û' => 'u',
'Ý' => 'Y',
'ý' => 'y',
'ÿ' => 'y',
'Ž' => 'Z',
'ž' => 'z'
);
}
/* This should never return false. */
return strtr(strval($str), self::$_map);
}
}