关于 Makeindex、Subentries 和 Stackengine（以及没有 Xindy）

Question

\makeindex索引条目的级别数上限为三级似乎是一个众所周知的缺陷。

例如，如果我运行代码

\documentclass{book}
\usepackage{imakeidx}
\let\cleardoublepage\clearpage
\usepackage{imakeidx}
\makeindex
\usepackage{idxlayout}

\begin{document}
\LARGE

``I love my subject.''\index{\textbf{James Joseph Sylvester}! After Woolwich and Charlottesville! Arrives at Baltimore}
%\index{\textbf{James Joseph Sylvester}! After Woolwich and Charlottesville! Arrives at Baltimore! Is paid in gold at Johns Hopkins}
\idxlayout{columns=1}
\printindex
\end{document}

一切都很好；索引如下

但是，如果我\index{\textbf{James Joseph Sylvester}! After Woolwich and Charlottesville! Arrives at Baltimore}用

\index{\textbf{James Joseph Sylvester}! After Woolwich and Charlottesville! Arrives at Baltimore! Is paid in gold at Johns Hopkins}

然后索引就会消失。

在阅读 Steven B. Segeletes 对如何自动将姓名的首字母与下方头衔的首字母对齐，我决定发布这个问题：

问题：\makeindex仅使用 (而非 xindy)，是否可以stackengine巧妙地调用包以容纳索引条目的第四级；如果可以，如何通过修改上述代码来实现这一点？如果不使用stackengine，有没有其他不使用 的方法xindy？

谢谢。

Answer 1

假设在（一个或多个）假的 4 级入口之前总有一个 3 级入口

\documentclass{book}
\usepackage{imakeidx}
\let\cleardoublepage\clearpage %why
\usepackage{imakeidx}
\makeindex
\usepackage{idxlayout}

\begin{document}
\LARGE

``I love my subject.''\index{\textbf{James Joseph Sylvester}! After Woolwich and Charlottesville! Arrives at Baltimore}
x\index{\textbf{James Joseph Sylvester}! After Woolwich and Charlottesville! Arrives at Baltimore,  Is paid in gold at Johns Hopkins@{\hspace*{15pt}Is paid in gold at Johns Hopkins}}
\idxlayout{columns=1}
\printindex
\end{document}

---

或不带逗号表示第三级条目

\begin{filecontents}{\jobname.ist}
delim_2 "\\nonumcheck "
\end{filecontents}
\documentclass{book}
\usepackage{imakeidx}
\let\cleardoublepage\clearpage %why
\usepackage{imakeidx}
\makeindex[options= -s \jobname.ist]
\usepackage{idxlayout}

\newcommand\nonum[1]{}
\makeatletter
\newcommand\nonumcheck{\@ifnextchar\nonum{}{, }}
\makeatletter

\begin{document}
\LARGE

``I love my subject.''%
\index{\textbf{James Joseph Sylvester}! After Woolwich and Charlottesville! Arrives at Baltimore|nonum}
x%
\index{\textbf{James Joseph Sylvester}! After Woolwich and Charlottesville! Arrives at Baltimore,  Is paid in gold at Johns Hopkins@{\hspace*{15pt}Is paid in gold at Johns Hopkins}}
\idxlayout{columns=1}
\printindex
\end{document}