如何在环境中打印计数器的开始值和结束值？

Question

我正在开发标准化测试的格式化系统。在测试的每个部分中，都有一组连续的问题，我可以选择将它们包含在环境中。

\begin{passagequestions}
    \begin{question} % question 1, or whichever this is.
    \end{question}
    % and so on
\end{passagequestions}

无论何时使用，questioncount外部都会提供计数器。假设所做的只是增加问题编号，即通过。passagequestionsquestion\stepcounter{questioncount}

在每个 实例的开头passagequestions，我想命名属于该问题组的所有问题。 每个 实例passagequestions都应以 开头Questions {0}--{1} are based on the following passage.，其中{0}是第一个问题的索引（可能是 1，也可能不是），{1}是最后一个问题的索引。

我以前的解决方案是使用totcount来跟踪问题组的长度，但我的印象是那不是一个好主意。

Answer 1

编辑请参阅最后的更好版本。

与 Werner 类似，但我使用的是假标签，一旦hyperref使用就会破裂。

\documentclass{article}

\usepackage{refcount}

\newcounter{passage}%
\newcounter{question}

\newenvironment{question}{\refstepcounter{question}}{}



\makeatletter
\newenvironment{passagequestions}{%
  \refstepcounter{passage}%
  % Store the fake label for the beginning
  \immediate\write\@auxout{%
    \string\newlabel{passagestart::\number\value{passage}}{{\number\value{question}}{\thepage}}%
  }%
  Questions \getrefnumber{passagestart::\number\value{passage}} -- \getrefnumber{passageend::\number\value{passage}} are based on the following passage.
}{%Store the fake label for the end
  \immediate\write\@auxout{%
    \string\newlabel{passageend::\number\value{passage}}{{\number\value{question}}{\thepage}}%
  }%
}
\makeatother





\begin{document}

\begin{passagequestions}
\begin{question}
\end{question}

\begin{question}
\end{question}
\begin{question}
\end{question}
\begin{question}
\end{question}


\end{passagequestions}

\begin{passagequestions}

\begin{question}
\end{question}

\begin{question}
\end{question}
\begin{question}
\end{question}
\begin{question}
\end{question}


\end{passagequestions}


\end{document}

编辑更好的版本

\documentclass{article}

\usepackage{xpatch}
\usepackage{refcount}
\usepackage{xcolor}
\newif\ifnewpassage
\newpassagefalse

\newcounter{passage}%
\newcounter{question}


%Define some dummy question environment

\newenvironment{question}{%
\vskip0.3\abovedisplayskip

\refstepcounter{question}%
\colorbox{yellow}{\bfseries \textcolor{blue}{Question \thequestion}}%

\addvspace{0.5\baselineskip}
}{\vskip0.5\belowdisplayskip}

% Add some code to the question environment
\makeatletter

\newcommand{\storefakelabel}[3][\number\value{passage}]{%
  \immediate\write\@auxout{%
    \string\newlabel{#2#1}{{#3}{\thepage}}%
  }%
}

\newcommand{\passagestartprefix}{passagestart:}
\newcommand{\passageendprefix}{passageend:}

\newcommand{\getstartquestion}{%
  \getrefnumber{\passagestartprefix\number\value{passage}}
}

\newcommand{\getendquestion}{%
  \getrefnumber{\passageendprefix\number\value{passage}}%
}

\xapptocmd{\question}{% Append the stuff after(!!!) the question startup code has been done!
  \ifnewpassage%
  \storefakelabel{\passagestartprefix}{\number\value{question}}%
  \global\newpassagefalse%
  \fi%
}{}{}

\newcommand{\passagequestionsheading}{%
\colorbox{green}{Questions \getstartquestion -- \getendquestion\ are based on the following passage.}
}

\newenvironment{passagequestions}{%
  \vskip\abovedisplayskip%
  \newpassagetrue% Started a new passage
  \refstepcounter{passage}%
  \colorbox{red}{\large \bfseries Questions passage \thepassage}%

  \passagequestionsheading

}{%
  % Store the fake label for the end
  \storefakelabel{\passageendprefix}{\number\value{question}}%
  \vskip\belowdisplayskip%
}
\makeatother



\begin{document}

\begin{passagequestions}
\begin{question}
  Why does \LaTeXe\ provide that much fun?
\end{question}

\begin{question}
\end{question}
\begin{question}
\end{question}
\begin{question}
\end{question}


\end{passagequestions}

\begin{passagequestions}

\begin{question}
\end{question}

\begin{question}
\end{question}
\begin{question}
\end{question}
\begin{question}
\end{question}


\end{passagequestions}


\end{document}

Answer 2

以下是对您的问题的非正式解决方案：

1. 用passagequestions​\label

2. 回忆一下环境开始时的这些\labels 。\refpassagequestions

您必须确保计数器步进能够在其被调用的环境中生存。虽然这是自然情况，但在系统中使用的步进计数器值的重新定义却\@currentlabel不能。\label\ref

\documentclass{article}

\newcounter{question}
\newcounter{passagequestions}
\newenvironment{passagequestions}
  {\stepcounter{passagequestions}%
   \par\addvspace{\bigskipamount}\noindent
   Questions \ref{pq-\thepassagequestions-start}--\ref{pq-\thepassagequestions-end} are based on the following passage\ldots
   \par
   \renewcommand{\question}{%
     \oldquestion%
     \label{pq-\thepassagequestions-start}%
     \global\let\question\oldquestion}}%
  {\label{pq-\thepassagequestions-end}}

\makeatletter
\newenvironment{question}
  {\stepcounter{question}%
   \xdef\@currentlabel{\thequestion}%
   \par\addvspace{\baselineskip}%
   \textbf{Question~\thequestion}:}
  {}
\makeatother

\let\oldquestion\question

\begin{document}

\begin{passagequestions}
  This is the first passage\ldots
  \begin{question}
    First question
  \end{question}
  \begin{question}
    Second question
  \end{question}
  \begin{question}
    Third question
  \end{question}
\end{passagequestions}

\begin{passagequestions}
  This is the second passage \ldots
  \begin{question}
    First question
  \end{question}
  \begin{question}
    Second question
  \end{question}
  \begin{question}
    Third question
  \end{question}
\end{passagequestions}

\end{document}