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从交叉引用标签中的描述标签中删除最后一个字符

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从交叉引用标签中的描述标签中删除最后一个字符

我读过如何制作带有描述标签的标签作为标签的参考（LaTeX 中描述列表项的参考名称)：

\makeatletter
\let\orgdescriptionlabel\descriptionlabel
\renewcommand*{\descriptionlabel}[1]{%
  \let\orglabel\label
  \let\label\@gobble
  \phantomsection
  \edef\@currentlabel{#1}%
  %\edef\@currentlabelname{#1}%
  \let\label\orglabel
  \orgdescriptionlabel{#1}%
}
\makeatother

这可行。但是，描述标签通常以特殊字符结尾，如:或,，这不应成为参考标签的一部分。我如何从参考标签中删除此字符？

编辑：

尝试过：

\usepackage{xstring}
...
  \edef\@currentlabel{\StrGobbleRight{#1}{1}}%
...

但由于某种原因，这似乎不起作用。

编辑

以下是完整文档（来自上面的链接）：

\documentclass{article}
\usepackage{hyperref}
\usepackage{nameref}

\makeatletter
\let\orgdescriptionlabel\descriptionlabel
\renewcommand*{\descriptionlabel}[1]{%
  \let\orglabel\label
  \let\label\@gobble
  \phantomsection
  \edef\@currentlabel{#1}%
  %\edef\@currentlabelname{#1}%
  \let\label\orglabel
  \orgdescriptionlabel{#1}%
}
\makeatother

\begin{document}

\section{Definitions}
\begin{description}
    \item [Vehicle\label{itm:vehicle}] Something
    \item [Bus\label{itm:bus}] A type of \ref{itm:vehicle}
    \item [Car\label{itm:car}] A type of \ref{itm:vehicle} smaller than a    \ref{itm:bus}
\end{description} 

The item `\ref{itm:bus}' is listed on page~\pageref{itm:bus} in section~\nameref{itm:bus}.

\end{document}

答案1

您可以根据以下条件选择删除最后一个标点符号\spacefactor：

\documentclass{article}
\usepackage{xstring}
\usepackage{hyperref}
\usepackage{nameref}

\makeatletter
\let\orgdescriptionlabel\descriptionlabel
\renewcommand*{\descriptionlabel}[1]{%
  \begingroup
  \let\label\@gobble
  \phantomsection
  \protected@edef\daniel@currentlabel{#1}%
  \sbox\z@{\daniel@currentlabel\xdef\daniel@sf{\the\spacefactor}}%
  \ifnum\daniel@sf>1000
    \noexpandarg
    \expandafter\StrGobbleRight\expandafter{\daniel@currentlabel}{1}[\daniel@currentlabel]%
  \fi
  \def\x{%
    \expandafter\endgroup
    \expandafter\def\expandafter\@currentlabelname
    \expandafter{\daniel@currentlabel}}%
  \x
  \orgdescriptionlabel{#1}%
}
\makeatother

\begin{document}

\section{Definitions}
\begin{description}
    \item [Vehicle\label{itm:vehicle}] Something
    \item [Bus,\label{itm:bus}] A type of \nameref{itm:vehicle}
    \item [Car\label{itm:car}] A type of \nameref{itm:vehicle} smaller than a \nameref{itm:bus}
\end{description}

References: `\nameref{itm:bus}' and `\nameref{itm:car}'.
\end{document}

标点符号后，空间因子大于 1000（使用标准\nonfrenchspacing设置；如果使用\frenchspacing，还会加载amsthm调整内容，以便仍可使用空间因子）。

在此处输入图片描述

为了使用\ref而不是\nameref，只需要做一个小小的改变；我建议在\ref数字和\nameref文本的使用上保持一致，但我能理解不改变现有文档的必要性。

\documentclass{article}
\usepackage{xstring}
\usepackage{hyperref}

\makeatletter
\let\orgdescriptionlabel\descriptionlabel
\renewcommand*{\descriptionlabel}[1]{%
  \begingroup
  \let\label\@gobble
  \phantomsection
  \protected@edef\daniel@currentlabel{#1}%
  \sbox\z@{\daniel@currentlabel\xdef\daniel@sf{\the\spacefactor}}%
  \ifnum\daniel@sf>1000
    \noexpandarg
    \expandafter\StrGobbleRight\expandafter{\daniel@currentlabel}{1}[\daniel@currentlabel]%
  \fi
  \def\x{%
    \expandafter\endgroup
    \expandafter\def\expandafter\@currentlabel
    \expandafter{\daniel@currentlabel}}%
  \x
  \orgdescriptionlabel{#1}%
}
\makeatother

\begin{document}

\section{Definitions}
\begin{description}
    \item [Vehicle\label{itm:vehicle}] Something
    \item [Bus,\label{itm:bus}] A type of \ref{itm:vehicle}
    \item [Car\label{itm:car}] A type of \ref{itm:vehicle} smaller than a \ref{itm:bus}
\end{description}

References: `\ref{itm:bus}' and `\ref{itm:car}'.
\end{document}

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