TeXMacro/expandafter.tex at master · SahayanKY/TeXMacro · GitHub

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\documentclass{jsarticle}

\makeatletter


\def\testA{{A}{B}}
\def\testB#1{[#1]}
\def\testC{\testB\testA}
\def\testD{D}
\def\testE{E}
\def\testF{F}

\makeatother


\begin{document}
\tracingonline=1
\tracingmacros=1
\tracingcommands=1

1

%[A]B
\expandafter\expandafter\testC
%\expandafter\testB\testA
%\testB{A}{B}
%

2

%[AB]
\expandafter\expandafter\expandafter\testC
%\expandafter\testC
%\testC
%\testB\testA
%
%

3

%[AB]
\expandafter\expandafter\expandafter\expandafter\testC
%\expandafter\expandafter\testB\testA
%\expandafter\expandafter[\testA]
%\expandafter\expandafter[{A}{B}]
%
%?
%\expandafter[\testA]
%[{A}{B}]
%

4

%D[A]B
\expandafter\testD\expandafter\expandafter\testC
%\testD\expandafter\testB\testA
%D\expandafter\testB\testA
%D\testB{A}{B}
%D[A]{B}
%->正
%?
%\testD\expandafter\testB\testA
%\testD\expandafter[\testA]		%expandafterで抑制されたやつは後回しという考え方
%\testD\expandafter[{A}{B}]
%D[{A}{B}]
%->誤

5

%DEF
\expandafter\testD\expandafter\expandafter\testE\testF
%\testE -> \testD -> \testFの順に展開されている
%\testD\expandafter E\testF
%D\expandafter E\testF
%DEF
%
%一回展開したら、まだ展開していないところまで戻る？

\end{document}