如何在 QRCode 中的 directlua（tex.sprint）中获取回车符（换行符）？

Question

如何在每行末尾获得回车符（Lualatex）？

\documentclass{article}
\usepackage[nolinks,forget]{qrcode}%
\begin{document}

\newcommand{\Space}[0]{\ }% 
\newcommand{\CarriageReturn}[0]{\?}%
\qrset{height=2.5cm}

\qrcode[version=5]{
    \directlua{
        for i,p in ipairs( table.pack(1,2,3) )
        do
        tex.sprint (tostring(p),"\Space line \Space then \Space carriage \Space return" \CarriageReturn)
        end
    }
}% 

% Doesn't work:  tex.sprint([[\noexpand\newline]])
% Doesn't work:  \CarriageReturn
% Doesn't work:  empty line

\end{document}

Answer 1

您可以使用它在文档中\noexpand\n打印换行符（\n在 lua 字符串中） 。调整您的示例，我们得到以下内容：\directlua

\documentclass{article}
\usepackage[nolinks,forget]{qrcode}%
\begin{document}

\newcommand{\Space}[0]{\ }%

\qrset{height=2.5cm}

\qrcode[version=5]{
    \directlua{
        for i,p in ipairs( table.pack(1,2,3) )
        do
        tex.sprint (tostring(p),"\Space line \Space then \Space carriage \Space return\noexpand\n")
        end
    }
}%

\end{document}