SqlParser\Lexer::parseComment PHP Метод

    public function parseComment()
    {
        $iBak = $this->last;
        $token = $this->str[$this->last];
        // Bash style comments. (#comment\n)
        if (Context::isComment($token)) {
            while (++$this->last < $this->len && $this->str[$this->last] !== "\n") {
                $token .= $this->str[$this->last];
            }
            $token .= "\n";
            // Adding the line ending.
            return new Token($token, Token::TYPE_COMMENT, Token::FLAG_COMMENT_BASH);
        }
        // C style comments. (/*comment*\/)
        if (++$this->last < $this->len) {
            $token .= $this->str[$this->last];
            if (Context::isComment($token)) {
                $flags = Token::FLAG_COMMENT_C;
                // This comment already ended. It may be a part of a
                // previous MySQL specific command.
                if ($token === '*/') {
                    return new Token($token, Token::TYPE_COMMENT, $flags);
                }
                // Checking if this is a MySQL-specific command.
                if ($this->last + 1 < $this->len && $this->str[$this->last + 1] === '!') {
                    $flags |= Token::FLAG_COMMENT_MYSQL_CMD;
                    $token .= $this->str[++$this->last];
                    while (++$this->last < $this->len && '0' <= $this->str[$this->last] && $this->str[$this->last] <= '9') {
                        $token .= $this->str[$this->last];
                    }
                    --$this->last;
                    // We split this comment and parse only its beginning
                    // here.
                    return new Token($token, Token::TYPE_COMMENT, $flags);
                }
                // Parsing the comment.
                while (++$this->last < $this->len && ($this->str[$this->last - 1] !== '*' || $this->str[$this->last] !== '/')) {
                    $token .= $this->str[$this->last];
                }
                // Adding the ending.
                if ($this->last < $this->len) {
                    $token .= $this->str[$this->last];
                }
                return new Token($token, Token::TYPE_COMMENT, $flags);
            }
        }
        // SQL style comments. (-- comment\n)
        if (++$this->last < $this->len) {
            $token .= $this->str[$this->last];
            if (Context::isComment($token)) {
                // Checking if this comment did not end already (```--\n```).
                if ($this->str[$this->last] !== "\n") {
                    while (++$this->last < $this->len && $this->str[$this->last] !== "\n") {
                        $token .= $this->str[$this->last];
                    }
                    $token .= "\n";
                    // Adding the line ending.
                }
                return new Token($token, Token::TYPE_COMMENT, Token::FLAG_COMMENT_SQL);
            }
        }
        $this->last = $iBak;
        return null;
    }