101     static public function preg_quote($what) {  argument
102         return preg_quote($what, '/');
3689     protected function literal($what, $eatWhitespace = null) {  argument
3693         if (!isset($what[1]) && isset($this->buffer[$this->count])) {
3694             if ($this->buffer[$this->count] == $what) {
3705         if (!isset(self::$literalCache[$what])) {
3706             self::$literalCache[$what] = lessc::preg_quote($what);
3709         return $this->match(self::$literalCache[$what], $m, $eatWhitespace);
3740     protected function to($what, &$out, $until = false, $allowNewline = false) {  argument
3746 …      if (!$this->match('('.$validChars.'*?)'.lessc::preg_quote($what), $m, !$until)) return false;
3747         if ($until) $this->count -= strlen($what); // give back $what