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newenvironment 中的 renewcommand

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newenvironment 中的 renewcommand

我在新环境中重新定义命令时遇到问题。

MWE 不工作：

\documentclass{book}
\makeatletter
\newcommand{\mysection}{\@ifstar{\mysection@star}{\mysection@nostar}}
\newcommand{\mysection@star}[1]{\begingroup\sloppy\raggedright\section*{#1}\endgroup}
\newcommand{\mysection@nostar}[1]{\begingroup\sloppy\raggedright\section{#1}\endgroup}
\newcommand{\mysubsection}{\@ifstar{\mysubsection@star}{\mysubsection@nostar}}
\newcommand{\mysubsection@star}[1]{\begingroup\sloppy\raggedright\subsection*{#1}\endgroup}
\newcommand{\mysubsection@nostar}[1]{\begingroup\sloppy\raggedright\subsection{#1}\endgroup}
\makeatother

\newenvironment{MySubAppendix}{%
    \makeatletter%
    \renewcommand{\mysection}{\@ifstar{\mysubsection@star}{\mysubsection@nostar}}%
    \makeatother%
}{}

\begin{document}
\begin{MySubAppendix}
\mysection{Sub After Block Example}
\end{MySubAppendix}
\end{document}

使用 pdflatex 会导致：

This is pdfTeX, Version 3.14159265-2.6-1.40.19 (MiKTeX 2.9.6840 64-bit)
entering extended mode
(refman.tex
LaTeX2e <2018-04-01> patch level 5
("C:\Program Files\MiKTeX 2.9\tex\latex\base\book.cls"
Document Class: book 2014/09/29 v1.4h Standard LaTeX document class
("C:\Program Files\MiKTeX 2.9\tex\latex\base\bk10.clo")) (refman.aux)
! You can't use `\spacefactor' in vertical mode.
\@->\spacefactor
                 \@m {}
l.19 \mysection
               {Sub After Block Example}

工作MWE：

\documentclass{book}
\makeatletter
\newcommand{\mysection}{\@ifstar{\mysection@star}{\mysection@nostar}}
\newcommand{\mysection@star}[1]{\begingroup\sloppy\raggedright\section*{#1}\endgroup}
\newcommand{\mysection@nostar}[1]{\begingroup\sloppy\raggedright\section{#1}\endgroup}
\newcommand{\mysubsection}{\@ifstar{\mysubsection@star}{\mysubsection@nostar}}
\newcommand{\mysubsection@star}[1]{\begingroup\sloppy\raggedright\subsection*{#1}\endgroup}
\newcommand{\mysubsection@nostar}[1]{\begingroup\sloppy\raggedright\subsection{#1}\endgroup}
\makeatother

\newenvironment{MySubAppendix}{%
}{}

\begin{document}
\begin{MySubAppendix}
    \makeatletter%
    \renewcommand{\mysection}{\@ifstar{\mysubsection@star}{\mysubsection@nostar}}%
    \makeatother%
\mysection{Sub After Block Example}
\end{MySubAppendix}
\end{document}

乍一看，工作版本是一种替代方案，但是当多次出现这种情况时，每次编写以下部分都会有点问题：

    \makeatletter%
    \renewcommand{\mysection}{\@ifstar{\mysubsection@star}{\mysubsection@nostar}}%
    \makeatother%

有任何想法吗？

答案1

根据@campa 的评论，我尝试了以下操作：

\documentclass{book}
\makeatletter
\newcommand{\mysection}{\@ifstar{\mysection@star}{\mysection@nostar}}
\newcommand{\mysection@star}[1]{\begingroup\sloppy\raggedright\section*{#1}\endgroup}
\newcommand{\mysection@nostar}[1]{\begingroup\sloppy\raggedright\section{#1}\endgroup}
\newcommand{\mysubsection}{\@ifstar{\mysubsection@star}{\mysubsection@nostar}}
\newcommand{\mysubsection@star}[1]{\begingroup\sloppy\raggedright\subsection*{#1}\endgroup}
\newcommand{\mysubsection@nostar}[1]{\begingroup\sloppy\raggedright\subsection{#1}\endgroup}
\makeatother

\makeatletter%
\newenvironment{MySubAppendix}{%
    \renewcommand{\mysection}{\@ifstar{\mysubsection@star}{\mysubsection@nostar}}%
}{}
\makeatother%

\begin{document}
\begin{MySubAppendix}
\mysection{Sub After Block Example}
\end{MySubAppendix}
\end{document}

这不仅在这个小例子中有效，而且在我的更大的代码中也有效。

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