我正在尝试使用 xsim 包编写一份文档。它分为几章，每章都包含自己的练习，每章末尾都有解决方案。
目前，每个章节的结构都是手写的，ChManual.tex但我想使用类似的东西macroChapter.tex，它使用\thechapter作为参数来调用和打印为 xsim 定义的集合。
如果您使用，以下 MWE 可以工作ChManual.tex，如果您取消注释第 1 章和第 2 章的行%\input{macroChapter.tex}，它将无法工作并显示错误：unknown-collection "collCh\thechapter"。
\documentclass{report}
\usepackage{filecontents}
\usepackage{xsim}
\DeclareExerciseCollection{collCh1}
\DeclareExerciseCollection{collCh2}
\DeclareExerciseCollection{collChManual}
\begin{filecontents}{Ch1.tex}
\begin{exercise}
This is exercise 1 from chapter \thechapter.
\end{exercise}
\begin{solution}
This is solution of exercise 1 from chapter \thechapter.
\end{solution}
\end{filecontents}
\begin{filecontents}{Ch2.tex}
\begin{exercise}
This is exercise 1 from chapter \thechapter.
\end{exercise}
\begin{solution}
This is solution of exercise 1 from chapter \thechapter.
\end{solution}
\begin{exercise}
This is exercise 2 from chapter \thechapter.
\end{exercise}
\begin{solution}
This is solution of exercise 2 from chapter \thechapter.
\end{solution}
\end{filecontents}
\begin{filecontents}{ChManual.tex}
\begin{exercise}
This is exercise 1 from chapter \thechapter (Manual).
\end{exercise}
\begin{solution}
This is solution of exercise 1 from chapter \thechapter (Manual).
\end{solution}
\begin{exercise}
This is exercise 2 from chapter \thechapter (Manual).
\end{exercise}
\begin{solution}
This is solution of exercise 2 from chapter \thechapter (Manual).
\end{solution}
\end{filecontents}
\begin{filecontents}{macroChapter.tex}
This is chapter \thechapter.
\collectexercises{collCh\thechapter}
\input{Ch\thechapter.tex}
\collectexercisesstop{collCh\thechapter}
\printcollection[print=exercises]{collCh\thechapter}
Bla bla bla bla bla bla bla bla bla bla bla.
\printsolutions[chapter=\thechapter,collection=collCh\thechapter]
\end{filecontents}
\begin{filecontents}{manualChapter.tex}
This is chapter Manual.
\collectexercises{collChManual}
\input{ChManual.tex}
\collectexercisesstop{collChManual}
\printcollection[print=exercises]{collChManual}
Bla bla bla bla bla bla bla bla bla bla bla.
\printsolutions[chapter=3,collection=collChManual]
\end{filecontents}
\begin{document}
\chapter{One}
%\input{macroChapter.tex}
\chapter{Two}
%\input{macroChapter.tex}
\chapter{Manual}
\input{manualChapter.tex}
\end{document}
答案1
这是“在将参数传递给下一个宏之前扩展该参数”的另一种变体。
具体来说，您需要x宏的变体\xsim_start_collection:n以及适配的用户命令：\xsim_stop_collection:n\xsim_print_collection:nn
\ExplSyntaxOn
\RenewDocumentCommand \collectexercises {t!m}
{
\IfBooleanTF {#1}
{ \xsim_start_collection:x {#2} }
{ \xsim_start_collection:n {#2} }
}
\RenewDocumentCommand \collectexercisesstop {t!m}
{
\IfBooleanTF {#1}
{ \xsim_stop_collection:x {#2} }
{ \xsim_stop_collection:n {#2} }
}
\RenewDocumentCommand \printcollection {t!O{}m}
{
\IfBooleanTF {#1}
{ \xsim_print_collection:nx {#2} {#3} }
{ \xsim_print_collection:nn {#2} {#3} }
}
\cs_generate_variant:Nn \xsim_start_collection:n {x}
\cs_generate_variant:Nn \xsim_stop_collection:n {x}
\cs_generate_variant:Nn \xsim_print_collection:nn {nx}
\ExplSyntaxOff
然后使用（注意感叹号）：
\begin{filecontents}{macroChapter.tex}
This is chapter \thechapter.
\collectexercises!{collCh\thechapter}
\input{Ch\thechapter.tex}
\collectexercisesstop!{collCh\thechapter}
\printcollection![print=exercises]{collCh\thechapter}
Bla bla bla bla bla bla bla bla bla bla bla.
\printsolutions[chapter=\thechapter,collection=collCh\thechapter]
\end{filecontents}
顺便说一句：我宁愿使用\arabic{chapter}而不是\thechapter集合名称中的——你想要的是数字而不是打印的输出！