Beamer 法语 + beamer + tikz 标签 + +b 环境 = booom

Question

label={45:my text}当启用 beamer + babel french 时，我无法使用标签语法将标签置于 45 度。我尝试了各种方法[fragile]，例如\usetikzlibrary{babel}或\AtBeginEnvironment{tikzpicture}{\shorthandoff{;}\shorthandoff{:}}，但都不起作用：

我有 代替

\documentclass{beamer}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage[french]{babel}
\usepackage{tikz}
\usetikzlibrary{positioning}
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
\usetikzlibrary{babel} % Important, or I get issues on other code when using french babel like "! Package tikz

\NewDocumentEnvironment{mytest}{+b}{
  % scantokens makes it *nearly* work, but then it fails again when using \only
  \scantokens{#1} % I do want to use +b as in practice I do more involved stuff here, involving recursion etc…
}{}
\begin{document}

\begin{frame}[fragile]
  but this fails
  \begin{mytest}
    \only<1>{ %% without the only, it works when using scantokens
      \begin{tikzpicture}
        \node[label={45:mylabel},fill=green]{AAA};
      \end{tikzpicture}
    }
  \end{mytest}
\end{frame}


\end{document}

Answer 1

\documentclass{beamer}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage[french]{babel}
\usepackage{tikz}
\usetikzlibrary{positioning}
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
\usetikzlibrary{babel} % Important, or I get issues on other code when using french babel like "! Package tikz

\NewDocumentEnvironment{mytest}{+b}{%
  #1 % I do want to use +b as in practice I do more involved stuff here, involving recursion etc…
}{}

\AddToHook{env/mytest/begin}{\shorthandoff{:}}
\begin{document}

\begin{frame}[fragile]
  \begin{mytest}
    \begin{tikzpicture}
      \node[label={45:mylabel},fill=green]{AAA};
    \end{tikzpicture}
  \end{mytest}
\end{frame}

\end{document}

您的环境必须尽早取消激活法国冒号；tikzpicture一旦内容被您的环境抓取和标记，将无法执行任何操作。

顺便说一句，我不熟悉 xparse 语法，所以这里可能缺少一些重要的解释。