123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204 |
- <?php
- namespace dokuwiki\Utf8;
- /**
- * Methods to assess and clean UTF-8 strings
- */
- class Clean
- {
- /**
- * Checks if a string contains 7bit ASCII only
- *
- * @author Andreas Haerter <andreas.haerter@dev.mail-node.com>
- *
- * @param string $str
- * @return bool
- */
- public static function isASCII($str)
- {
- return (preg_match('/(?:[^\x00-\x7F])/', $str) !== 1);
- }
- /**
- * Tries to detect if a string is in Unicode encoding
- *
- * @author <bmorel@ssi.fr>
- * @link http://php.net/manual/en/function.utf8-encode.php
- *
- * @param string $str
- * @return bool
- */
- public static function isUtf8($str)
- {
- $len = strlen($str);
- for ($i = 0; $i < $len; $i++) {
- $b = ord($str[$i]);
- if ($b < 0x80) continue; # 0bbbbbbb
- elseif (($b & 0xE0) === 0xC0) $n = 1; # 110bbbbb
- elseif (($b & 0xF0) === 0xE0) $n = 2; # 1110bbbb
- elseif (($b & 0xF8) === 0xF0) $n = 3; # 11110bbb
- elseif (($b & 0xFC) === 0xF8) $n = 4; # 111110bb
- elseif (($b & 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 === $len) || ((ord($str[$i]) & 0xC0) !== 0x80))
- return false;
- }
- }
- return true;
- }
- /**
- * Strips all high byte chars
- *
- * Returns a pure ASCII7 string
- *
- * @author Andreas Gohr <andi@splitbrain.org>
- *
- * @param string $str
- * @return string
- */
- public static function strip($str)
- {
- $ascii = '';
- $len = strlen($str);
- for ($i = 0; $i < $len; $i++) {
- if (ord($str[$i]) < 128) {
- $ascii .= $str[$i];
- }
- }
- return $ascii;
- }
- /**
- * Removes special characters (nonalphanumeric) from a UTF-8 string
- *
- * This function adds the controlchars 0x00 to 0x19 to the array of
- * stripped chars (they are not included in $UTF8_SPECIAL_CHARS)
- *
- * @author Andreas Gohr <andi@splitbrain.org>
- *
- * @param string $string The UTF8 string to strip of special chars
- * @param string $repl Replace special with this string
- * @param string $additional Additional chars to strip (used in regexp char class)
- * @return string
- */
- public static function stripspecials($string, $repl = '', $additional = '')
- {
- static $specials = null;
- if ($specials === null) {
- $specials = preg_quote(Table::specialChars(), '/');
- }
- return preg_replace('/[' . $additional . '\x00-\x19' . $specials . ']/u', $repl, $string);
- }
- /**
- * Replace bad bytes with an alternative character
- *
- * ASCII character is recommended for replacement char
- *
- * PCRE Pattern to locate bad bytes in a UTF-8 string
- * Comes from W3 FAQ: Multilingual Forms
- * Note: modified to include full ASCII range including control chars
- *
- * @author Harry Fuecks <hfuecks@gmail.com>
- * @see http://www.w3.org/International/questions/qa-forms-utf-8
- *
- * @param string $str to search
- * @param string $replace to replace bad bytes with (defaults to '?') - use ASCII
- * @return string
- */
- public static function replaceBadBytes($str, $replace = '')
- {
- $UTF8_BAD =
- '([\x00-\x7F]' . # ASCII (including control chars)
- '|[\xC2-\xDF][\x80-\xBF]' . # non-overlong 2-byte
- '|\xE0[\xA0-\xBF][\x80-\xBF]' . # excluding overlongs
- '|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}' . # straight 3-byte
- '|\xED[\x80-\x9F][\x80-\xBF]' . # excluding surrogates
- '|\xF0[\x90-\xBF][\x80-\xBF]{2}' . # planes 1-3
- '|[\xF1-\xF3][\x80-\xBF]{3}' . # planes 4-15
- '|\xF4[\x80-\x8F][\x80-\xBF]{2}' . # plane 16
- '|(.{1}))'; # invalid byte
- ob_start();
- while (preg_match('/' . $UTF8_BAD . '/S', $str, $matches)) {
- if (!isset($matches[2])) {
- echo $matches[0];
- } else {
- echo $replace;
- }
- $str = substr($str, strlen($matches[0]));
- }
- return ob_get_clean();
- }
- /**
- * Replace accented UTF-8 characters by unaccented ASCII-7 equivalents
- *
- * Use the optional parameter to just deaccent lower ($case = -1) or upper ($case = 1)
- * letters. Default is to deaccent both cases ($case = 0)
- *
- * @author Andreas Gohr <andi@splitbrain.org>
- *
- * @param string $string
- * @param int $case
- * @return string
- */
- public static function deaccent($string, $case = 0)
- {
- if ($case <= 0) {
- $string = strtr($string, Table::lowerAccents());
- }
- if ($case >= 0) {
- $string = strtr($string, Table::upperAccents());
- }
- return $string;
- }
- /**
- * Romanize a non-latin string
- *
- * @author Andreas Gohr <andi@splitbrain.org>
- *
- * @param string $string
- * @return string
- */
- public static function romanize($string)
- {
- if (self::isASCII($string)) return $string; //nothing to do
- return strtr($string, Table::romanization());
- }
- /**
- * adjust a byte index into a utf8 string to a utf8 character boundary
- *
- * @author chris smith <chris@jalakai.co.uk>
- *
- * @param string $str utf8 character string
- * @param int $i byte index into $str
- * @param bool $next direction to search for boundary, false = up (current character) true = down (next character)
- * @return int byte index into $str now pointing to a utf8 character boundary
- */
- public static function correctIdx($str, $i, $next = false)
- {
- if ($i <= 0) return 0;
- $limit = strlen($str);
- if ($i >= $limit) return $limit;
- if ($next) {
- while (($i < $limit) && ((ord($str[$i]) & 0xC0) === 0x80)) $i++;
- } else {
- while ($i && ((ord($str[$i]) & 0xC0) === 0x80)) $i--;
- }
- return $i;
- }
- }
|