public function tokenize(string $input) : TokenStream
    {
        $this->prepare($input);

        // Loop each character
        while ($this->cursor < $this->end) {
            $this->currentChar = $this->input[$this->cursor];

            if (preg_match('@'.Token::REGEX_T_EOL.'@', $this->currentChar)) {
                if ($this->mode !== self::MODE_IDENT) {
                    ++$this->line;
                    $this->lineOffset = $this->cursor + 1;
                }
            }

            switch ($this->mode) {

                case self::MODE_ALL:
                    $this->lexAll();
                    break;
                case self::MODE_INSIDE_TAG:
                    $this->lexInsideTag();
                    break;
                case self::MODE_IDENT:
                    $this->lexIdent();
                    break;
                case self::MODE_VAR:
                    $this->lexVar();
                    break;
                case self::MODE_STRING:
                    $this->lexString();
                    break;
                case self::MODE_NUMBER:
                    $this->lexNumber();
                    break;
                case self::MODE_OP:
                    $this->lexOperator();
                    break;
            }
        }

        return $this->stream;
    }