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简单嵌套环境问题

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简单嵌套环境问题

我以为这会很简单，也许确实如此，但我忽略了一些东西。以下（非功能性代码）给出了此错误：

./mwe-environments.tex:28: LaTeX Error: \begin{innerii} on input line 28 ended by \end{inneri}.

我遗漏了什么？我想outer开始inneri、innerii结束inner1并最终完成\end{outer}。innerii（这是一个基本的 MWE——环境中有很多内容。）

\documentclass{article}

\usepackage{xparse}
\usepackage{calc}

\NewDocumentEnvironment{myouter}{}{%
    \begin{inneri}
}{%
    \end{innerii}
}

\NewDocumentEnvironment{inneri}{}{%
    \bfseries
}{%
}

\NewDocumentEnvironment{innerii}{}{%
    \end{inneri}
    \itshape
}{%
%
}

\begin{document}

\begin{myouter}
Bla bla bla
\begin{innerii}
BLA bLA bLA
\end{myouter}

\end{document}

答案1

正如 David 所说，不建议这样做，因为它破坏了每个人都期望的 LaTeX范式。话虽如此，这里有另一种方法来解决这个问题：在环境中\begin{env}...\end{env}不要使用\begin{inneri}和，而只使用和。这会阻止 LaTeX 向前查找并搜索。完整代码：\end{inneri}\inneri\endinneri\end{inneri}

\documentclass{article}

\usepackage{xparse}
\usepackage{calc}

\NewDocumentEnvironment{myouter}{}{%
    \inneri
}{%
    \end{innerii}
}

\NewDocumentEnvironment{inneri}{}{%
    \bfseries
}{%
}

\NewDocumentEnvironment{innerii}{}{%
    \endinneri
    \itshape
}{%
%
}

\begin{document}

\begin{myouter}
Bla bla bla
\begin{innerii}
BLA bLA bLA
\end{myouter}

\end{document}

答案2

LaTeX 非常灵活，但是如果弯曲太多，它可能会断裂，但运行时不会出现错误。

\documentclass{article}

\usepackage{xparse}
\usepackage{calc}

\makeatletter
\NewDocumentEnvironment{myouter}{}{%
    \begin{inneri}%
}{%
% please don't do this in any public package
% it completely breaks latex syntax and any editors, syntax
% highlighters or humans trying to read the document.
   \def\@currenvir{innerii}%
    \end{innerii}%
}

\NewDocumentEnvironment{inneri}{}{%
    \bfseries
}{%
}

\NewDocumentEnvironment{innerii}{}{%
% please don't do this in any public package
% it completely breaks latex syntax and any editors, syntax
% highlighters or humans trying to read the document.
    \def\@currenvir{inneri}%
    \end{inneri}%
    \itshape
}{%
%
}
\makeatother
\begin{document}

\begin{myouter}
Bla bla bla
\begin{innerii}
BLA bLA bLA
\end{myouter}

\end{document}

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