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令牌读/写将#变成##

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令牌读/写将#变成##

当我尝试将用户在标记列表中给出的输入写入文件时，它会变成#，##因此如果用户想要写入\def\hello#1{Hello #1!}，而不是写入：

\def\hello#1{Hello #1!}

正如预期的那样我得到：

\def \hello ##1{Hello ##1!}

知道如何让它工作吗？理想情况下，我想避免要求用户更改他们的输入。

平均能量损失

\documentclass{article}

\newtoks\mytokens
\newwrite\myWrite

\NewDocumentCommand{\writeInFile}{m}{%
  \mytokens={#1}% We put the input in a token list (that token list might actually be populated by another script before)
  \immediate\openout\myWrite myfile.tex\relax% We open the output file
  \immediate\write\myWrite{\the\mytokens}% We write to the output file
  \immediate\closeout\myWrite% We close the file
}

\begin{document}

%% I don't want to change the syntax in this part of the document:
\writeInFile{\def\hello#1{Hello #1!}}
\input{myfile.tex}

\hello{Alice}
\hello{Bob}

\end{document}

答案1

这里我定义带有两个参数的命令，第一个是文件名。

#您想更改阅读之前的类别代码。

\documentclass{article}

\newwrite\myWrite
\newtoks\mytokens

\newcommand{\writeInFile}{%
  \begingroup\catcode`\#=12 \writeInFileAux
}
\newcommand{\writeInFileAux}[2]{% #1 = file name, #2 = what to write
  \immediate\openout\myWrite #1\relax% We open the output file
  \mytokens={#2}%
  \immediate\write\myWrite{\the\mytokens}% We write to the output file
  \immediate\closeout\myWrite% We close the file
  \endgroup
}

\begin{document}

%% I don't want to change the syntax in this part of the document:
\writeInFile{\jobname-out}{\def\hello#1{Hello #1!}}
\input{\jobname-out}

\hello{Alice}
\hello{Bob}

\end{document}

这将是写出的文件

\def \hello #1{Hello #1!}

当然，您不能将其\writeInFile作为另一个命令的参数。

您可以通过字符串替换来消除此限制。

\documentclass{article}

\ExplSyntaxOn

\iow_new:N \g_bora_write_iow
\str_new:N \l_bora_write_str

\NewDocumentCommand{\writeInFile}{mm}
 {
  % #1 = file name, #2 = what to write
  \str_set:Nn \l_bora_write_str { #2 }
  \str_replace_all:NnV \l_bora_write_str { ## } \c_hash_str
  \iow_open:Nn \g_bora_write_iow { #1 }
  \iow_now:NV \g_bora_write_iow \l_bora_write_str
  \iow_close:N \g_bora_write_iow
 }
\cs_generate_variant:Nn \iow_now:Nn { NV }
\cs_generate_variant:Nn \str_replace_all:Nnn { NnV }

\ExplSyntaxOff

\begin{document}

%% I don't want to change the syntax in this part of the document:
\textit{xx \writeInFile{\jobname-out}{\def\hello#1{Hello #1!}}}
\input{\jobname-out}

\hello{Alice}
\hello{Bob}

\end{document}

该\textit位仅用于演示目的。

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