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使用嵌套枚举作为表的一列

tag-icon • tag-icon tables enumerate tabularx
使用嵌套枚举作为表的一列

我正在表格中创建需求列表，其中第一列应为枚举，以便每个需求都由唯一编号标识。有些需求还有子需求，所以我需要嵌套枚举。

一个例子：

+-----+-----------------------------+
| ID  |         Requirement         |
+-----+-----------------------------+
| 1   | Requirement a               |
| 2   | Requirement b               |
| 2.1 | Some requirement of b       |
| 2.2 | Some other requirement of b |
| 3   | Another requirement         |
+-----+-----------------------------+

我能想到的唯一解决方案如下（显然不起作用，即使没有嵌套）：

\begin{tabularx}{\textwidth}{|X|X|}
\begin{enumerate}
  \hline
  \item & Requirement a \\ \hline
  \item & Requirement b \\ \hline
\end{enumerate}
\end{tabularx}

由于这个没有嵌套的示例不起作用，我认为带有嵌套的类似示例也不会起作用。我在 SE 上找到了其他向表格添加枚举的方法，例如这个不要扩展到嵌套枚举。

我怎样才能实现这样的枚举？

我怎样才能实现这样的目标？

答案1

一种稍微复杂的方法：

\documentclass{report}

\usepackage{tabularx}

\newcounter{rowItemCount}%
\newcounter{subRowItemCount}%
\newcommand\rowItem{
    \setcounter{subRowItemCount}{0}
    \addtocounter{rowItemCount}{1}
    \arabic{rowItemCount}}
\newcommand\subRowItem{
    \addtocounter{subRowItemCount}{1}
    \arabic{rowItemCount}.\arabic{subRowItemCount}}

\begin{document}
\begin{tabularx}{\textwidth}{|X|X|}
  \hline
  \rowItem{} & Requirement a \\ \hline
  \rowItem{} & Requirement b \\ \hline
  \subRowItem{} & Requirement b.1 \\ \hline
  \subRowItem{} & Requirement b.2 \\ \hline
  \rowItem{} & Requirement c \\ \hline
  \subRowItem{} & Requirement c.1 \\ \hline
\end{tabularx}
\end{document}

如果您想要使用字母而不是数字，可以将 改为arabic（alph或）。如果不添加额外命令，则无法扩展到更深的嵌套。Alph

是否有特殊原因需要将其放在表格中？

编辑

添加这些内容后，行号将根据每个tabularx环境重置，如下所示：

\newcommand\resetRowItemCounters{
    \setcounter{rowItemCount}{0}}
\AtBeginEnvironment{tabularx}{\resetRowItemCounters}

答案2

这是使用几个计数器（添加更多计数器以增加更多级别）和array包的版本。我创建了两个命令来嵌套和取消嵌套计数器的级别。可能有更优雅的方法来做到这一点，但这非常直观。

\documentclass{article}

\usepackage{array}
\usepackage{tabularx}
\usepackage{etoolbox}
% two counters for the nesting level; add more as needed
% counters are of the form tabl<num> where <num> is roman
\newcounter{tabli}
\newcounter{tablii}[tabli]
% counter to keep track of the level
\newcounter{counterlevel}
% command to reset the counters for multiple tables
\newcommand{\resettablcounters}
  {\setcounter{counterlevel}{1}
    \setcounter{tabli}{0}
    \setcounter{tablii}{0}}
% reset counters each tabularx environment 
\AtBeginEnvironment{tabularx}{\resettablcounters}
% define the dependent counters display 
\renewcommand{\thetablii}{\thetabli.\arabic{tablii}}
% two commands to nest and unnest the levels
% the \nest command must go at the beginning of the row that will
% have nested dependents (not on the first dependent row)
% the \unnest command goes as the beginning of the last dependent
\newcommand{\nest}{\addtocounter{counterlevel}{1}}
\newcommand{\unnest}{\addtocounter{counterlevel}{-1}}
% command to step and display the level to be executed at each row.
\newcommand{\displaylevel}
  {\refstepcounter{tabl\roman{counterlevel}}\csname thetabl\roman{counterlevel}\endcsname}
% create an enumerated column type
\newcolumntype{E}{>{\displaylevel}l}

\begin{document}

\begin{tabularx}{\textwidth}{|E|X|}
\hline
\multicolumn{1}{|c|}{ID}  & Requirement \\
\hline
 & This is a requirement. \\
 \nest & This is a requirement. \\ 
 & This is a sub requirement \\
 \unnest & And yet another\\
 \nest & This is no longer a sub requirement\\
 \unnest & But this one is.\\
 & And another requirement\\
 \hline
\end{tabularx}

% another table to show that counters reset properly 

\begin{tabularx}{\textwidth}{|E|X|}
\hline
\multicolumn{1}{|c|}{ID}  & Requirement \\
\hline
 & This is a requirement. \\
 \nest & This is a requirement. \\ 
 & This is a sub requirement \\
 \unnest & And yet another\\
 \nest & This is no longer a sub requirement\\
 \unnest & But this one is.\\
 & And another requirement\\
 \hline
\end{tabularx}

\end{document}

代码输出

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