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注释掉一条毫无意义的语句后出现编译错误

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注释掉一条毫无意义的语句后出现编译错误

我正在制作一份多语言文档。在 Steven B. Segletes 先生的大力帮助下，我能够处理多语言混合文档，该文档只能输出所需的一种或多种语言。请参阅主题解析以逗号分隔的命令参数

我还将\mulan新命令别名为\mulanp和 ，\mulanr以便\mulan当文本由\par或分隔时可以简化命令/。

现在我正在定义一个别名命令，使之\mulan在表中也能工作。（我不知道如何定义可变数字参数命令，所以我只是将参数数量固定为三个）当我编译以下最小示例时，它按预期工作。但是当我在表前注释一个毫无意义的语句时，它会给出一条错误消息，

!Missing  \endcsname inserted.

你能帮忙吗？提前谢谢。

%
% Command \mulan usage example
% Compiled by XeLatex
\documentclass{article}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Table packages
\usepackage{longtable}     %long table across multi pages

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \mulan comand defintion to deal with multiple language
\newif\ifen %English
\newif\iffr %French
\newif\ifru %Russian
\newif\ifjp %Japanese
\newif\ifcn %Chinese
\newif\ifkr %Korean
%
\def\en#1{\ifen\callsep #1\fi\langcmd}
\def\fr#1{\iffr\callsep #1\fi\langcmd}
\def\ru#1{\ifru\callsep #1\fi\langcmd}
\def\jp#1{\ifjp\callsep #1\fi\langcmd}
\def\cn#1{\ifcn\callsep #1\fi\langcmd}
\def\kr#1{\ifkr\callsep #1\fi\langcmd}



%specify the multi languge sequence variable globaly
\def\mulanseq#1{\gdef\my@mulanseq{#1}}
%\gdef\my@mulanseq{en,jp,cn}

\newcounter{mulan@args}

%\newcommand\mulan[2][en,jp,cn]{%  
\newcommand\mulan[2][en,jp,cn]{%  
  \gdef\thesep{#2}% 
  \setcounter{mulan@args}{0}%
  \commaparse#1,\relax%
  \stepcounter{mulan@args}%
  \expandafter\def\csname arg\romannumeral\value{mulan@args}\endcsname{relax}%
  \setcounter{mulan@args}{0}%
  \langcmd%
}

\def\commaparse#1,#2\relax{%
  \stepcounter{mulan@args}%
  \expandafter\def\csname arg\romannumeral\value{mulan@args}\endcsname{#1}%
  \if\relax#2\else\commaparse#2\relax\fi%
}

\newcommand\langcmd{%
  \stepcounter{mulan@args}%
  \csname\csname arg\romannumeral\value{mulan@args}\endcsname\endcsname%
}

\newcommand\callsep{\ifnum\value{mulan@args}>1\thesep\fi}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Convient alias command for \mulan
\def\mulanp{\expandafter\mulan{\par}}
\def\mulanr{\expandafter\mulan{ \space {\textbf{/}}\space}}

% multiline in tab cell !!! problem yet !!!
\newcommand\mulanT[4][l]{
 \begin{tabular}{#1}
    \mulan{\\}{#2}{#3}{#4}  %
 \end{tabular}
}
%
\newcommand\mulanTL{\mulanT[l]}
\newcommand\mulanTC{\mulanT[c]}
\newcommand\mulanTR{\mulanT[r]}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}

%%%---------------------
\entrue \jptrue \cntrue

%%%---------This command has not been finished yet------
%\mulanseq{en,jp,cn}

\title{\mulanp{English Document}{Japanese Document}{Chinese Document}}
\author{\mulanr{English name}{Japanese name}{Chinese name}}

\maketitle 

\tableofcontents

\abstract

\section{\mulanr{English title}{Japanese title}{Chinese title}}

%%% !!! if the following statement is commented, there will be an error occured.
%\mulan{}{}{}{}  % I just make it do nothing


\begin{longtable}{ccc}
\hline
 \mulanT{English item}{Japanese item}{Chinese item}　& Price(USD) & \mulanT{Englishi-Repark}{Japanese-Repark}{Chinese-Remark}\\
\hline
 \mulanT{IamEnglish}{IamJapanese}{IamChinese}  & 15.0 & \mulanT{This is remark in English and is very long.}{This is remark in Japanese and is very long.}{This is remark in Chinese and is very long.}    \\
\hline
\end{longtable}

\end{document}

答案1

你的命令的编码\mulan有点奇怪，我不确定它的目的是什么，所以我不会建议改变，但评论具有误导性：

\mulan{}{}{}{}  % I just make it do nothing

它不做任何事情。该命令定义了几个命令，特别是\argiii ，您收到的错误是由于该命令未定义（或更准确地说，它被定义为\relax）

! Missing \endcsname inserted.
<to be read again> 
                   \argiii 
                   ^^^^^^^
l.96 ...English item}{Japanese item}{Chinese item}

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