<?php
/**
 * CleanURLs class
 * 
 * PHP Version 5
 * 
 * @category Plugin
 * @package  CleanURLs
 * @author   Pierre Rudloff <contact@rudloff.pro>
 * @license  http://www.gnu.org/licenses/gpl-3.0.html GNU General Public License
 * @link     http://rudloff.pro
 * */
 
 /**
 * Class to remove problematic characters from URLs
 * 
 * PHP Version 5
 * 
 * @category Plugin
 * @package  CleanURLs
 * @author   Pierre Rudloff <contact@rudloff.pro>
 * @license  http://www.gnu.org/licenses/gpl-3.0.html GNU General Public License
 * @link     http://rudloff.pro
 * */
class CleanURLs
{
    /**
     * Check if a string is UTF-8
     * 
     * @param string $str String to check
     * 
     * @return  bool
     * 
     * @author  WordPress
     * @license https://wordpress.org/about/gpl/ GPLv2
     * */
    static function seemsUtf8($str) 
    {
        $length = strlen($str);
        for ($i=0; $i < $length; $i++) {
            $c = ord($str[$i]);
            if ($c < 0x80) {
                $n = 0; // 0bbbbbbb
            } elseif (($c & 0xE0) == 0xC0) {
                $n=1; // 110bbbbb
            } elseif (($c & 0xF0) == 0xE0) {
                $n=2; // 1110bbbb
            } else if (($c & 0xF8) == 0xF0) {
                $n=3; // 11110bbb
            } elseif (($c & 0xFC) == 0xF8) {
                $n=4; // 111110bb
            } elseif (($c & 0xFE) == 0xFC) {
                $n=5; // 1111110b
            } else {
                return false; // Does not match any model
            }
            for ($j=0; $j<$n; $j++) { // n bytes matching 10bbbbbb follow ?
                if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80)) {
                    return false;
                }
            }
        }
        return true;
    }

    /**
     * Converts all accent characters to ASCII characters.
     *
     * If there are no accent characters, then the string given is just returned.
     *
     * @param string $string Text that might have accent characters
     * 
     * @return string Filtered string with replaced "nice" characters.
     * 
     * @author  WordPress
     * @license https://wordpress.org/about/gpl/ GPLv2
     */
    static function removeAccents($string)
    {
        if (!preg_match('/[\x80-\xff]/', $string)) {
            return $string;
        }

        if (self::seemsUtf8($string)) {
            $chars = array(
            // Decompositions for Latin-1 Supplement
            chr(195).chr(128) => 'A', chr(195).chr(129) => 'A',
            chr(195).chr(130) => 'A', chr(195).chr(131) => 'A',
            chr(195).chr(132) => 'A', chr(195).chr(133) => 'A',
            chr(195).chr(135) => 'C', chr(195).chr(136) => 'E',
            chr(195).chr(137) => 'E', chr(195).chr(138) => 'E',
            chr(195).chr(139) => 'E', chr(195).chr(140) => 'I',
            chr(195).chr(141) => 'I', chr(195).chr(142) => 'I',
            chr(195).chr(143) => 'I', chr(195).chr(145) => 'N',
            chr(195).chr(146) => 'O', chr(195).chr(147) => 'O',
            chr(195).chr(148) => 'O', chr(195).chr(149) => 'O',
            chr(195).chr(150) => 'O', chr(195).chr(153) => 'U',
            chr(195).chr(154) => 'U', chr(195).chr(155) => 'U',
            chr(195).chr(156) => 'U', chr(195).chr(157) => 'Y',
            chr(195).chr(159) => 's', chr(195).chr(160) => 'a',
            chr(195).chr(161) => 'a', chr(195).chr(162) => 'a',
            chr(195).chr(163) => 'a', chr(195).chr(164) => 'a',
            chr(195).chr(165) => 'a', chr(195).chr(167) => 'c',
            chr(195).chr(168) => 'e', chr(195).chr(169) => 'e',
            chr(195).chr(170) => 'e', chr(195).chr(171) => 'e',
            chr(195).chr(172) => 'i', chr(195).chr(173) => 'i',
            chr(195).chr(174) => 'i', chr(195).chr(175) => 'i',
            chr(195).chr(177) => 'n', chr(195).chr(178) => 'o',
            chr(195).chr(179) => 'o', chr(195).chr(180) => 'o',
            chr(195).chr(181) => 'o', chr(195).chr(182) => 'o',
            chr(195).chr(182) => 'o', chr(195).chr(185) => 'u',
            chr(195).chr(186) => 'u', chr(195).chr(187) => 'u',
            chr(195).chr(188) => 'u', chr(195).chr(189) => 'y',
            chr(195).chr(191) => 'y',
            // Decompositions for Latin Extended-A
            chr(196).chr(128) => 'A', chr(196).chr(129) => 'a',
            chr(196).chr(130) => 'A', chr(196).chr(131) => 'a',
            chr(196).chr(132) => 'A', chr(196).chr(133) => 'a',
            chr(196).chr(134) => 'C', chr(196).chr(135) => 'c',
            chr(196).chr(136) => 'C', chr(196).chr(137) => 'c',
            chr(196).chr(138) => 'C', chr(196).chr(139) => 'c',
            chr(196).chr(140) => 'C', chr(196).chr(141) => 'c',
            chr(196).chr(142) => 'D', chr(196).chr(143) => 'd',
            chr(196).chr(144) => 'D', chr(196).chr(145) => 'd',
            chr(196).chr(146) => 'E', chr(196).chr(147) => 'e',
            chr(196).chr(148) => 'E', chr(196).chr(149) => 'e',
            chr(196).chr(150) => 'E', chr(196).chr(151) => 'e',
            chr(196).chr(152) => 'E', chr(196).chr(153) => 'e',
            chr(196).chr(154) => 'E', chr(196).chr(155) => 'e',
            chr(196).chr(156) => 'G', chr(196).chr(157) => 'g',
            chr(196).chr(158) => 'G', chr(196).chr(159) => 'g',
            chr(196).chr(160) => 'G', chr(196).chr(161) => 'g',
            chr(196).chr(162) => 'G', chr(196).chr(163) => 'g',
            chr(196).chr(164) => 'H', chr(196).chr(165) => 'h',
            chr(196).chr(166) => 'H', chr(196).chr(167) => 'h',
            chr(196).chr(168) => 'I', chr(196).chr(169) => 'i',
            chr(196).chr(170) => 'I', chr(196).chr(171) => 'i',
            chr(196).chr(172) => 'I', chr(196).chr(173) => 'i',
            chr(196).chr(174) => 'I', chr(196).chr(175) => 'i',
            chr(196).chr(176) => 'I', chr(196).chr(177) => 'i',
            chr(196).chr(178) => 'IJ',chr(196).chr(179) => 'ij',
            chr(196).chr(180) => 'J', chr(196).chr(181) => 'j',
            chr(196).chr(182) => 'K', chr(196).chr(183) => 'k',
            chr(196).chr(184) => 'k', chr(196).chr(185) => 'L',
            chr(196).chr(186) => 'l', chr(196).chr(187) => 'L',
            chr(196).chr(188) => 'l', chr(196).chr(189) => 'L',
            chr(196).chr(190) => 'l', chr(196).chr(191) => 'L',
            chr(197).chr(128) => 'l', chr(197).chr(129) => 'L',
            chr(197).chr(130) => 'l', chr(197).chr(131) => 'N',
            chr(197).chr(132) => 'n', chr(197).chr(133) => 'N',
            chr(197).chr(134) => 'n', chr(197).chr(135) => 'N',
            chr(197).chr(136) => 'n', chr(197).chr(137) => 'N',
            chr(197).chr(138) => 'n', chr(197).chr(139) => 'N',
            chr(197).chr(140) => 'O', chr(197).chr(141) => 'o',
            chr(197).chr(142) => 'O', chr(197).chr(143) => 'o',
            chr(197).chr(144) => 'O', chr(197).chr(145) => 'o',
            chr(197).chr(146) => 'OE',chr(197).chr(147) => 'oe',
            chr(197).chr(148) => 'R',chr(197).chr(149) => 'r',
            chr(197).chr(150) => 'R',chr(197).chr(151) => 'r',
            chr(197).chr(152) => 'R',chr(197).chr(153) => 'r',
            chr(197).chr(154) => 'S',chr(197).chr(155) => 's',
            chr(197).chr(156) => 'S',chr(197).chr(157) => 's',
            chr(197).chr(158) => 'S',chr(197).chr(159) => 's',
            chr(197).chr(160) => 'S', chr(197).chr(161) => 's',
            chr(197).chr(162) => 'T', chr(197).chr(163) => 't',
            chr(197).chr(164) => 'T', chr(197).chr(165) => 't',
            chr(197).chr(166) => 'T', chr(197).chr(167) => 't',
            chr(197).chr(168) => 'U', chr(197).chr(169) => 'u',
            chr(197).chr(170) => 'U', chr(197).chr(171) => 'u',
            chr(197).chr(172) => 'U', chr(197).chr(173) => 'u',
            chr(197).chr(174) => 'U', chr(197).chr(175) => 'u',
            chr(197).chr(176) => 'U', chr(197).chr(177) => 'u',
            chr(197).chr(178) => 'U', chr(197).chr(179) => 'u',
            chr(197).chr(180) => 'W', chr(197).chr(181) => 'w',
            chr(197).chr(182) => 'Y', chr(197).chr(183) => 'y',
            chr(197).chr(184) => 'Y', chr(197).chr(185) => 'Z',
            chr(197).chr(186) => 'z', chr(197).chr(187) => 'Z',
            chr(197).chr(188) => 'z', chr(197).chr(189) => 'Z',
            chr(197).chr(190) => 'z', chr(197).chr(191) => 's',
            // Euro Sign
            chr(226).chr(130).chr(172) => 'E',
            // GBP (Pound) Sign
            chr(194).chr(163) => '');

            $string = strtr($string, $chars);
        } else {
            // Assume ISO-8859-1 if not UTF-8
            $chars['in'] = chr(128).chr(131).chr(138).chr(142).chr(154).chr(158)
                .chr(159).chr(162).chr(165).chr(181).chr(192).chr(193).chr(194)
                .chr(195).chr(196).chr(197).chr(199).chr(200).chr(201).chr(202)
                .chr(203).chr(204).chr(205).chr(206).chr(207).chr(209).chr(210)
                .chr(211).chr(212).chr(213).chr(214).chr(216).chr(217).chr(218)
                .chr(219).chr(220).chr(221).chr(224).chr(225).chr(226).chr(227)
                .chr(228).chr(229).chr(231).chr(232).chr(233).chr(234).chr(235)
                .chr(236).chr(237).chr(238).chr(239).chr(241).chr(242).chr(243)
                .chr(244).chr(245).chr(246).chr(248).chr(249).chr(250).chr(251)
                .chr(252).chr(253).chr(255);

            $chars['out'] = "EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUY".
                "aaaaaaceeeeiiiinoooooouuuuyy";

            $string = strtr($string, $chars['in'], $chars['out']);
            $double_chars['in'] = array(
                chr(140), chr(156), chr(198), chr(208), chr(222),
                chr(223), chr(230), chr(240), chr(254)
            );
            $double_chars['out'] = array(
                'OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th'
            );
            $string = str_replace(
                $double_chars['in'], $double_chars['out'], $string
            );
        }

        return $string;
    }
    
    /**
     * Clean URLs from diacritics and punctuation
     * 
     * @param object $blog Current blog
     * @param object $cur  Cursor
     * 
     * @return void
     * */
    public static function clean($blog, $cur) 
    {
        $cur->post_url = self::removeAccents($cur->post_url);
        $cur->post_url = strtr($cur->post_url, ",!.?;", "-----");
    }
}
?>