
這是問題的後續多章交叉引用。根據這個問題的答案,我使用以下巨集:
\newcommand*\maybechapter[1]{%
% Tests if current chapter is equal to the chapter number of label)
\ifnum\value{chapter}=0#1\relax
% Print nothing if so
\else
% Set 'chapter' locally (=> no \setcounter) to the label chapter and
% print it in the usual format followed by a dot
{\value{chapter}=#1\relax\thechapter.}%
\fi
}
\renewcommand*\thesection{%
\protect\maybechapter{\arabic{chapter}}\arabic{section}%
}
這按照參考的預期工作,但在目錄中,章節號現在都前面有其章節號:
I The first chapter
I.1 The first section of the first chapter
但我想要得到類似的東西
I The first chapter
1 The first section of the first chapter
我應該如何修改 \maybechapter 才能得到這個結果?
答案1
我會在以下幾點修改答案:
\documentclass{book}
\renewcommand*\thechapter{\Roman{chapter}}
\renewcommand*\thesection{%
\maybechapter{\arabic{chapter}}\arabic{section}%
}
% Maybe print the chapter number
\protected\def\maybechapter#1{%
% Tests if current chapter is equal to the chapter number of label)
\ifnum\value{chapter}=0#1
\else
\uppercase\expandafter{\romannumeral#1}.%
\fi
}
% Test document:
\begin{document}
\begingroup
\def\maybechapter#1{}
\tableofcontents
\endgroup
\chapter{One}
\section{S1}\label{S1}
Here's a reference to Section~\ref{S1},
one to Section~\ref{S2}, and one to
Section~\ref{S3}.
\section{S2}\label{S2}
Text
\chapter{Two}
\section{S3}\label{S3}
\end{document}
使用\protected\def
確保\maybechapter
在寫入操作中永遠不會擴展;由於 TOC 的條目經過二寫入操作,一個\protect
是不夠的。
對於目錄,我在本地禁用該\maybechapter
命令,以便它吞噬其參數。