Tikz：建立節點後執行程式碼而不觸及路徑

Question

由於某些原因（為了使節點影響 tikzcd 中指向它的箭頭的樣式），我需要執行一段程式碼\tikzlastnode來取得 tikz(cd) 矩陣中目前位置的名稱，但這是僅在建立節點後定義。不幸的是，append after command需要一個路徑（空路徑顯然不是有效的輸入），所以我需要創建一個假的空節點來執行路徑，這聽起來很髒，我擔心它可能會導致問題（添加空間，幹擾接下來的路徑......）。我們可以append after command在不干擾路徑的情況下運行（或等效）嗎？

微量元素：

\documentclass{article}

\usepackage{tikz}
\usepackage{tikz-cd}

\begin{document}
\makeatletter
\begin{tikzcd}
  A \rar[/utils/exec={\message{BBBBB The message above (AAAA) should be equal to \tikzcd@ar@target}}, draw=\myfillcolor] & |[append after command={
    %%% Creating an empty node + /utils/exec sounds really dirty:
    node[/utils/exec={%
      \message{AAAA I need to have access to the name of the current node \tikzlastnode}%
      \gdef\myfillcolor{red}
    }%
    ] {}
  }
  ]| B
\end{tikzcd}
\end{document}

編輯

有人提議\pgfextra ... \endpgfextra並且有效！謝謝！

\documentclass{article}

\usepackage{tikz}
\usepackage{tikz-cd}

\begin{document}
\makeatletter
\begin{tikzcd}
  A \rar[/utils/exec={\message{BBBBB The message above (AAAA) should be equal to \tikzcd@ar@target}}, draw=\myfillcolor] & |[append after command={%
    \pgfextra% this syntax with \endpgfextra completely turns off the tikz syntax, that might be safer than \pgfextra{...}.
      \message{AAAA I need to have access to the name of the current node \tikzlastnode}%
      \gdef\myfillcolor{red}%
    \endpgfextra%
    }]| B
\end{tikzcd}
\end{document}