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依赖于 documentclass 的自定义环境编号

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依赖于 documentclass 的自定义环境编号

扩展答案这里。我定义了一个自定义环境，它会自动将章节号添加到其自己的计数器上。显然，这只适用于那些定义章节号并产生错误的文档类article。

有没有办法在环境本身中构建一个 if/then 语句，只有当 chapternumber 已定义时才为章节号添加前缀，否则跳过前缀？

%\documentclass{article}
\documentclass{report}

\usepackage{xkeyval}
\usepackage{noindentafter}

\makeatletter
\define@boolkey{fam}[myenv@]{title}[true]{}
\define@boolkey{fam}[myenv@]{notitle}[true]{\ifmyenv@notitle\myenv@titlefalse\else\myenv@titletrue\fi}
\define@cmdkey{fam}[myenv@]{label}[\relax]{}
\define@cmdkey{fam}[myenv@]{repeat}[\relax]{}
\newcounter{myenvcnt}[chapter]%
\renewcommand{\themyenvcnt}{\thechapter.\arabic{myenvcnt}}
\newenvironment{myenv}[1][]{%
  \setkeys{fam}{title,label,repeat,#1}%
  \ifmyenv@title%
    \par%
    \expandafter\ifx\myenv@repeat\relax
      \refstepcounter{myenvcnt}%
      \expandafter\ifx\myenv@label\relax\else\label{\myenv@label}\fi
    \else
      \renewcommand{\themyenvcnt}{\ref{\myenv@repeat}}%
    \fi
    \subsubsection*{\textit{myenv\ \themyenvcnt}}% 
    \par\nobreak%
  \else% = if no title
    \par\addvspace{\bigskipamount}%
  \fi
  \edef\@currentlabel{\themyenvcnt}%
}{\par\addvspace{\bigskipamount}%
}
\NoIndentAfterEnv{myenv}
\appto\@noindent@newenv@hook{\par}{}{}
\makeatother


\begin{document}

\begin{myenv}
My environment.
\end{myenv}

\myenv{Test}

\end{document}

如果能提供任何关于如何做到这一点或从哪里开始的帮助，我将非常感激。

答案1

您可以使用以下内容：

%\documentclass{article}
\documentclass{report}

\usepackage{xkeyval}
\usepackage{noindentafter}

\makeatletter
\define@boolkey{fam}[myenv@]{title}[true]{}
\define@boolkey{fam}[myenv@]{notitle}[true]{\ifmyenv@notitle\myenv@titlefalse\else\myenv@titletrue\fi}
\define@cmdkey{fam}[myenv@]{label}[\relax]{}
\define@cmdkey{fam}[myenv@]{repeat}[\relax]{}


\newcounter{myenvcnt}
\@ifundefined{chapter}{}{%
\@addtoreset{myenvcnt}{chapter}
\renewcommand{\themyenvcnt}{\thechapter.\arabic{myenvcnt}}}

\newenvironment{myenv}[1][]{%
  \setkeys{fam}{title,label,repeat,#1}%
  \ifmyenv@title%
    \par%
    \expandafter\ifx\myenv@repeat\relax
      \refstepcounter{myenvcnt}%
      \expandafter\ifx\myenv@label\relax\else\label{\myenv@label}\fi
    \else
      \renewcommand{\themyenvcnt}{\ref{\myenv@repeat}}%
    \fi
    \subsubsection*{\textit{myenv\ \themyenvcnt}}% 
    \par\nobreak%
  \else% = if no title
    \par\addvspace{\bigskipamount}%
  \fi
  \edef\@currentlabel{\themyenvcnt}%
}{\par\addvspace{\bigskipamount}%
}
\NoIndentAfterEnv{myenv}
\appto\@noindent@newenv@hook{\par}{}{}
\makeatother


\begin{document}

\begin{myenv}
My environment.
\end{myenv}

\myenv{Test}

\end{document}

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