对于我编写的包（schemabloc -https://ctan.org/pkg/schemabloc) 运行正常，但是当我使用它来显示 Tikz 代码示例时，tcolorbox 包出现了问题。
我从包中提取了似乎导致问题的两个函数。带星号的 \sbComp*... 命令版本系统地显示了错误
TeX 容量超出，抱歉 [grouping levels=255]。\pgf@setlengthorig #1#2->\begingroup \pgfutil@selectfont \pgf@setlengthorig ...
你能看一下代码，看看问题出在哪里吗（我在使用 showexpl 包时也遇到了错误（https://www.ctan.org/pkg/showexpl））
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{fit,calc,positioning,shapes.misc}
\usepackage[most]{tcolorbox}
\newtcblisting{tikzexample}[1][]{tikz lower,
listing side text, fonttitle=\bfseries,
bicolor, colback=blue!15!white, colbacklower=white,
colframe=black, righthand width=0.5\textwidth, #1}
\makeatletter
\newcommand{\sbEntree}[2][0,0]{
\node [coordinate, name=#2] at (#1) {};
\node(#2droite) at (#2){};
}
\newcommand*{\sbCompSum}{\@ifstar\sbCompSumNorm\sbCompSumUsuel}
\newcommand{\sbCompSumUsuel}[7][4]{
\node [draw, circle,minimum size=2em, right of=#3droite%
,node distance=#1em] (#2) {};
\node [draw, cross out,minimum size=1.414em,
right of=#3droite,node distance=#1em] {};
\node [above of=#2,node distance=0.6em,inner sep=0] {$#4$};
\node [below of=#2,node distance=0.6em,inner sep=0] {$#5$};
\node [left of=#2,node distance=0.6em,inner sep=0] {$#6$};
\node [right of=#2,node distance=0.6em,inner sep=0] {$#7$};
\node (#2droite) at (#2.east){};
\node (#2gauche) at (#2.west){};
}
\newcommand{\sbCompSumNorm}[7][4]{
\node [draw, circle,minimum size=1.5em, right of=#3,node distance=#1em,] (#2) {};
\node [ fit=(#2),inner sep=0.5em] (compext) {};
\node at( compext.75){$#4$};
\node at( compext.-75){$#5$};
\node at( compext.165){$#6$};
\node at( compext.15){$#7$};
\node (#2droite) at (#2.east){};
\node (#2gauche) at (#2.west){};
}
\newcommand*{\sbComp}{\@ifstar\sbCompNorm\sbCompUsuel}
\newcommand{\sbCompUsuel}[3][4]{
\sbCompSum[#1]{#2}{#3}{}{-}{+}{}
}
\newcommand{\sbCompNorm}[3][4]{
\sbCompSum*[#1]{#2}{#3}{}{-}{+}{}
}
\makeatother
\begin{document}
\begin{tikzpicture}
\sbEntree{E};
\sbComp{C1}{E}
\end{tikzpicture}
\begin{tikzexample}[title=Commande , listing outside text, righthand width=0.45\textwidth,]
\begin{tikzpicture}
\sbEntree{E};
\sbComp{C1}{E}
\end{tikzpicture}
\end{tikzexample}
\begin{tikzpicture}
\sbEntree{E};
\sbComp*{C1}{E}
\end{tikzpicture}
%---------------------------
% code that doesn't work%
%\begin{tikzexample}[title=Commande , listing outside text, righthand width=0.45\textwidth,]
%\begin{tikzpicture}
%\sbEntree{E};
%\sbComp*{C1}{E}
%\end{tikzpicture}
%\end{tikzexample}
\end{document}
答案1
不要嵌套tikzpicture环境。tikz lower已经tikzpicture在框的下部放置了一个环境，因此您需要从代码中完全省略它或将其注释掉。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{fit,calc,positioning,shapes.misc}
\usepackage[most]{tcolorbox}
\newtcblisting{tikzexample}[1][]{%
tikz lower,
listing side text,
fonttitle=\bfseries,
bicolor,
colback=blue!15!white,
colbacklower=white,
colframe=black,
righthand width=0.5\textwidth,
#1%
}
\makeatletter
\newcommand{\sbEntree}[2][0,0]{%
\node [coordinate, name=#2] at (#1) {};
\node(#2droite) at (#2){};
}
\newcommand*{\sbCompSum}{\@ifstar\sbCompSumNorm\sbCompSumUsuel}
\newcommand{\sbCompSumUsuel}[7][4]{%
\node [draw, circle,minimum size=2em, right of=#3droite,node distance=#1em] (#2) {};
\node [draw, cross out,minimum size=1.414em,right of=#3droite,node distance=#1em] {};
\node [above of=#2,node distance=0.6em,inner sep=0] {$#4$};
\node [below of=#2,node distance=0.6em,inner sep=0] {$#5$};
\node [left of=#2,node distance=0.6em,inner sep=0] {$#6$};
\node [right of=#2,node distance=0.6em,inner sep=0] {$#7$};
\node (#2droite) at (#2.east){};
\node (#2gauche) at (#2.west){};
}
\newcommand{\sbCompSumNorm}[7][4]{%
\node [draw, circle,minimum size=1.5em, right of=#3,node distance=#1em] (#2) {};
\node [ fit=(#2),inner sep=0.5em] (compext) {};
\node at( compext.75){$#4$};
\node at( compext.-75){$#5$};
\node at( compext.165){$#6$};
\node at( compext.15){$#7$};
\node (#2droite) at (#2.east){};
\node (#2gauche) at (#2.west){};
}
\newcommand*{\sbComp}{\@ifstar\sbCompNorm\sbCompUsuel}
\newcommand{\sbCompUsuel}[3][4]{%
\sbCompSum[#1]{#2}{#3}{}{-}{+}{}%
}
\newcommand{\sbCompNorm}[3][4]{%
\sbCompSum*[#1]{#2}{#3}{}{-}{+}{}%
}
\makeatother
\begin{document}
\begin{tikzpicture}
\sbEntree{E};
\sbComp{C1}{E}
\end{tikzpicture}
\begin{tikzexample}[title=Commande , listing outside text, righthand width=0.45\textwidth,]
% \begin{tikzpicture}
\sbEntree{E};
\sbComp{C1}{E}
% \end{tikzpicture}
\end{tikzexample}
\begin{tikzpicture}
\sbEntree{E};
\sbComp*{C1}{E}
\end{tikzpicture}
%---------------------------
% code that doesn't work%
\begin{tikzexample}[title=Commande , listing outside text, righthand width=0.45\textwidth,]
% \begin{tikzpicture}
\sbEntree{E};
\sbComp*{C1}{E}
% \end{tikzpicture}
\end{tikzexample}
\end{document}
