条件章节编号

Question

我想找到或实现一个系统，其中 LaTeX 仅在编号的（子）部分后面跟着另一个（子）部分时才会编译该部分。否则，（子）部分将保持未编号状态。实际上，这意味着：

 i. Section               (numbered)
    ii. Subsection        (numbered)
    ii. Subsection        (numbered)
i. Section                (numbered)
    * Subsection          (unnumbered)
i. Section                (numbered)
    ii. Subsection        (numbered)
    ii. Subsection        (numbered)
        * Subsubsection   (unnumbered)
    ii. Subsection        (numbered)

因此，仅当 (子) 节的计数器在当前节级别内达到大于 1 的值时，我才需要 LaTeX 对 (子) 节进行编号。有人能帮我吗？

Answer 1

这显然需要一个双程系统。

在.aux文件中我存储了必要的信息，并在下次运行时检查给定级别是否存在多个部门单元。

\documentclass{article}

\NewCommandCopy{\latexsubsection}{\subsection}
\NewCommandCopy{\latexsubsubsection}{\subsubsection}

% a generic infrastructure
\NewDocumentCommand{\genericlevel}{mmsO{#5}m}{%
  \IfBooleanTF{#3}{%
    #1*{#5}% call is \level*
  }{%
    \wantsnumberingTF{#2}{%
      #1[#4]{#5}%
    }{%
      #1*{#5}%
      \addcontentsline{toc}{#2}{#4}%
      \stepcounter{#2}%
    }
  }
}
% redefine the levels to use the generic infrastructure
\RenewDocumentCommand{\subsection}{}{\genericlevel{\latexsubsection}{subsection}}
\RenewDocumentCommand{\subsubsection}{}{\genericlevel{\latexsubsubsection}{subsubsection}}

\ExplSyntaxOn

\NewDocumentCommand{\wantsnumberingTF}{mmm}
 {
  % first write the relevant info
  \tl_set:Nx \l_tmpa_tl
   {
    \str_case:nn { #1 }
     {
      {subsection}{\arabic{section}}
      {subsubsection}{\arabic{section}.\arabic{subsection}}
     }
   }
  \iow_now:cx {@auxout}
   {
    \savednumber { \l_tmpa_tl } { \arabic{#1} }
   }
  % now check whether the relevant number is greater than zero
  \cs_if_exist:cTF { savednumber\l_tmpa_tl }
   {
    \int_compare:nTF { \use:c { savednumber\l_tmpa_tl } > 0 } { #2 } { #3 }
   }
   {
    #2
   }
 }

\NewDocumentCommand{\savednumber}{mm}
 {
  \cs_gset:cpn { savednumber#1 } { #2 }
 }

\ExplSyntaxOff

\begin{document}

\tableofcontents

\section{Numbered}
\subsection{Numbered}
\subsection{Numbered}
\section{Numbered}
\subsection{Unnumbered}
\section{Numbered}
\subsection{Numbered}
\subsubsection{Numbered}
\subsubsection{Numbered}
\subsection{Numbered}
\subsubsection{Unnumbered}
\subsection{Numbered}

\end{document}