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處理巨集的逗號分隔參數清單中的 _（底線）

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處理巨集的逗號分隔參數清單中的 _（底線）

情境:我創建了一個“ \citep-like”巨集。我在文件正文中使用它來引用附錄中的一些程式碼。

我的巨集採用逗號分隔的清單作為輸入，並將清單的每個元素列印為hyperref程式碼相關部分的連結。 （為了簡單起見，hyperref連結的文字本身就是鍵，連結錨點的語法是code:<key>。）

\documentclass{article}
    \usepackage{etoolbox}
    \usepackage{hyperref}
    \usepackage{lipsum}

    \newcommand{\codecitep}[1]{% cf. https://tex.stackexchange.com/a/87423/64454
        [%
        \def\nextitem{\def\nextitem{, }}% Separator
        \renewcommand*{\do}[1]{\nextitem{\hyperref[code:##1]{##1}}}% How to process each item
        \docsvlist{#1}% Process list
        ]%
    }   
\begin{document}
    \section{Body}
        A sentence with one code-citation only \codecitep{key1}.
        Another sentence with two code-citations and followed by dummy text \codecitep{key1, key2}.
%       A sentence with one code-citation only \codecitep{a_123}.
%       Another sentence with two code-citations and followed by dummy text \codecitep{a_123, bb_456}.

        \lipsum[1-2]

    \section{Appendix}
        \lipsum[3]

        \subsection{key1}
        \label{code:key1}
        \label{code:a_123}
        \lipsum[4]

        \subsection{key2}
        \label{code:key2}
        \label{code:bb_456}
        \lipsum[5]
\end{document}

問題： 上面的 MWE 效果很好。然而，我的實際情況鍵具有以下結構：a_123，bb_456等（即鍵中間有一個下劃線，並且它之前的字母數量未知。）當然，這會導致編譯失敗，因為下劃線既不是逃脫也不在數學環境中。

問題：如何處理巨集的逗號分隔參數清單中帶有底線的鍵？

答案1

您可以使用\detokenize;但如果你想要一個列印下劃線，您需要載入fontenc該T1選項。

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{etoolbox}
\usepackage{hyperref}
\usepackage{lipsum}

\newcommand{\codecitep}[1]{% cf. https://tex.stackexchange.com/a/87423/64454
  [%
  \def\nextitem{\def\nextitem{, }}% Separator
  % How to process each item
  \renewcommand*{\do}[1]{%
    \nextitem\hyperref[code:##1]{\detokenize{##1}}%
  }%
  \docsvlist{#1}% Process list
  ]%
}   
\begin{document}

\section{Body}
A sentence with one code-citation only \codecitep{key1}.
Another sentence with two code-citations and followed by dummy text \codecitep{key1, key2}.
A sentence with one code-citation only \codecitep{a_123}.
Another sentence with two code-citations and followed by dummy text \codecitep{a_123, bb_456}.

\lipsum[1-2]

\section{Appendix}
\lipsum[3]

\subsection{key1}
\label{code:key1}
\label{code:a_123}
\lipsum[4]

\subsection{key2}
\label{code:key2}
\label{code:bb_456}
\lipsum[5]
\end{document}

在此輸入影像描述

這是一個expl3版本，不需要fontenc.

\documentclass{article}
\usepackage{xparse}
\usepackage{hyperref}
\usepackage{lipsum}

\ExplSyntaxOn

% define a token list containing an underscore
\tl_const:Nx \c_ebo_codecite_us_tl { \char_generate:nn { `_ } { 8 } }

% the main macro
\NewDocumentCommand{\codecitep}{m}
 {
  \ebo_codecite:n { #1 }
 }

% variables and variants of kernel functions
\tl_new:N \l__ebo_codecite_key_print_tl
\seq_new:N \l__ebo_codecite_refs_seq

\cs_generate_variant:Nn \tl_replace_all:Nnn { NV }

% functions

\cs_new_protected:Nn \ebo_codecite:n
 {
  [
   % clear the sequence
   \seq_clear:N \l__ebo_codecite_refs_seq
   % loop through the input
   \clist_map_inline:nn { #1 }
    {
     % for the "print part", change _ into \_
     \tl_set:Nn \l__ebo_codecite_key_print_tl { ##1 }
     \tl_replace_all:NVn \l__ebo_codecite_key_print_tl \c_ebo_codecite_us_tl { \_ }
     % add to the sequence
     \__ebo_codecitep_add:nV { ##1 } \l__ebo_codecite_key_print_tl
    }
   % use the sequence, items separated by "comma space"
   \seq_use:Nn \l__ebo_codecite_refs_seq { ,~ }
  ]
 }

% an auxiliary function, for expanding the second argument
\cs_new_protected:Nn \__ebo_codecitep_add:nn
 {
  \seq_put_right:Nn \l__ebo_codecite_refs_seq { \hyperref[code:#1]{#2} }
 }
\cs_generate_variant:Nn \__ebo_codecitep_add:nn { nV }

\ExplSyntaxOff

\begin{document}

\section{Body}
A sentence with one code-citation only \codecitep{key1}.
Another sentence with two code-citations and followed by dummy text \codecitep{key1, key2}.
A sentence with one code-citation only \codecitep{a_123}.
Another sentence with two code-citations and followed by dummy text \codecitep{a_123, bb_456}.

\lipsum[1-2]

\section{Appendix}
\lipsum[3]

\subsection{key1}
\label{code:key1}
\label{code:a_123}
\lipsum[4]

\subsection{key2}
\label{code:key2}
\label{code:bb_456}
\lipsum[5]
\end{document}

在此輸入影像描述

答案2

最簡單的方法是載入url套件並定義 url 指令來格式化引用名稱：

\usepackage{url}
\DeclareUrlCommand{\coderefname}{\urlstyle{rm}}

\newcommand{\codecitep}[1]{% cf. https://tex.stackexchange.com/a/87423/64454
    [%
    \def\nextitem{\def\nextitem{, }}% Separator
    \renewcommand*{\do}[1]{\nextitem{\hyperref[code:##1]{\coderefname{##1}}}}% How to process each item
    \docsvlist{#1}% Process list
    ]%
}

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