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当没有提示时删除提示引用

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当没有提示时删除提示引用

我正在用来xsim打印练习的提示和解决方案。

所有的练习都有对应的答案，但是并不是所有的练习都有提示，如下所示。

当练习没有提示时，LaTeX 仍然会打印提示参考，但参考未知（如下图红色所示）。

我该如何修复这个问题，以便在没有提示的情况下，不会打印边距段落上的参考资料？

\documentclass[]{book}
\setlength{\parskip}{10pt}
\usepackage{xsim}

\xsimsetup{
  exercise/name={Question},
  exercises/name={Questions},
  solution/name={Solution},
  solutions/name={Solutions},
  exercise/within = chapter,
  exercise/template=myTemplate,
  solution/template =myTemplate ,
  print-solutions/headings-template = myTemplate
}

\DeclareExerciseEnvironmentTemplate{myTemplate}
{%
\IfInsideSolutionTF
    {\label{sol:\ExerciseID}}
    {\label{ex:\ExerciseID}}
{\par\normalfont\bfseries\GetExerciseName~\GetExerciseProperty{counter}~\GetExercisePropertyT{subtitle}{{(\PropertyValue)}}\newline}
\IfInsideSolutionTF
{\marginpar{Question in page \pageref{ex:\ExerciseID}}}%
{%
\marginpar{Hint in page \pageref{hint:\ExerciseID}}
\marginpar{Solution in page \pageref{sol:\ExerciseID}}}%
}
{\par
}

% Add hints for the exercises
\DeclareExerciseProperty{hint}
\newcommand\hint[1]{\SetExerciseProperty{hint}{#1}}
\newcommand\printhints{%
  \begin{description}
    \ForEachUsedExerciseByType{%
      \GetExercisePropertyT{hint}
        {\item[Hint to question\label{hint:##2}~##3]~\marginpar{Question in page \pageref{ex:\ExerciseID}}\marginpar{Solution in page \pageref{sol:\ExerciseID}}####1}%
    }%
  \end{description}
}

\begin{document}
\chapter{Geometry}
\section{Introduction}
In mathematics, the Euclidean plane is a Euclidean space of dimension two.

\begin{exercise}[subtitle={Pythagoras' theorem}]
  Prove that the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares on the other two sides.
  \hint{Draw the altitude from point C, and call H its intersection with the side AB.}
\end{exercise}
\begin{solution}
  The proof is easy.
\end{solution}

\begin{exercise}[subtitle={Thales's theorem}]
If A, B, and C are distinct points on a circle where the line AC is a diameter, the angle ABC is a right angle.
\end{exercise}
\begin{solution}
Since the sum of the angles in a triangle is equal to $180°$\ldots
\end{solution}
\newpage
\section*{Hints}
\printhints

\printsolutions[headings=true]
\end{document}

在此处输入图片描述

答案1

代替

\marginpar{Hint in page \pageref{hint:\ExerciseID}}

经过

\expandafter\ifx \csname r@hint:\ExerciseID \endcsname \relax \else
   \marginpar{Hint in page \pageref{hint:\ExerciseID}}\fi

此代码检查 是否已\r@hint:number定义。如果未定义，则不执行任何其他操作，只打印\marginpar。\r@hint:number当且仅当知道相关页码时， 才定义。

答案2

\ifhint为了解决你的问题，我修改了练习环境，以便只有条件为真时它才会引用提示，然后我定义了一个新环境myex，它检查标记是否\hint出现在环境主体中，如果是，则将条件\ifhint设置为真，否则什么也不会发生，然后它将主体传递给环境exercise。

\documentclass[]{book}
\setlength{\parskip}{10pt}
\usepackage{xsim}

\xsimsetup{
    exercise/name={Question},
    exercises/name={Questions},
    solution/name={Solution},
    solutions/name={Solutions},
    exercise/within = chapter,
    exercise/template=myTemplate,
    solution/template =myTemplate ,
    print-solutions/headings-template = myTemplate
}

\DeclareExerciseEnvironmentTemplate{myTemplate}
{%
    \IfInsideSolutionTF
    {\label{sol:\ExerciseID}}
    {\label{ex:\ExerciseID}}
    {\par\normalfont\bfseries\GetExerciseName~\GetExerciseProperty{counter}~\GetExercisePropertyT{subtitle}{{(\PropertyValue)}}\newline}
    \IfInsideSolutionTF
    {\marginpar{Question in page \pageref{ex:\ExerciseID}}}%
    {%
        \ifhint\marginpar{Hint in page \pageref{hint:\ExerciseID}}\fi
        \marginpar{Solution in page \pageref{sol:\ExerciseID}}}%
}
{\par
}

% Add hints for the exercises
\DeclareExerciseProperty{hint}
\newcommand\hint[1]{\SetExerciseProperty{hint}{#1}}
\newcommand\printhints{%
    \begin{description}
        \ForEachUsedExerciseByType{%
            \GetExercisePropertyT{hint}
            {\item[Hint to question\label{hint:##2}~##3]~\marginpar{Question in page \pageref{ex:\ExerciseID}}\marginpar{Solution in page \pageref{sol:\ExerciseID}}####1}%
        }%
    \end{description}
}
\newif\ifhint
\ExplSyntaxOn
\NewDocumentEnvironment {myex} { O{} +b }
    {
    \tl_if_in:nnTF {\hint} {#2} {\hinttrue} {}
    \begin{exercise}[#1]
        #2
    \end{exercise}
    \hintfalse
    }
    {}
\ExplSyntaxOff

\begin{document}
    \chapter{Geometry}
    \section{Introduction}
    In mathematics, the Euclidean plane is a Euclidean space of dimension two.
    
    \begin{myex}[subtitle={Pythagoras' theorem}]
        Prove that the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares on the other two sides.
        {\hint{Draw the altitude from point C, and call H its intersection with the side AB.}}
    \end{myex}
    \begin{solution}
        The proof is easy.
    \end{solution}
    
    \begin{myex}[subtitle={Thales's theorem}]
        If A, B, and C are distinct points on a circle where the line AC is a diameter, the angle ABC is a right angle.
    \end{myex}
    \begin{solution}
        Since the sum of the angles in a triangle is equal to $180°$\ldots
    \end{solution}
    \newpage
    \section*{Hints}
    \printhints
    
    \printsolutions[headings=true]
\end{document}

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