\mintinline 中的宏用法

Question 1

让我重新格式化它，使其可以阅读。

\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\mintinline{\ab}

现在我将换成\EXPANDAFTER那些受到第一个影响的，只是为了区分它们

\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\mintinline{\ab}

最后一个\EXPANDAFTER现在尝试扩展之后的标记\mintinline，这很容易：{无法扩展。因此所有标记的\expandafter标记都消失了，我们只剩下

\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\mintinline{\ab}

重复前面的步骤：

\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\mintinline{\ab}

最后一个扩展（一次）\mintinline，根据\mintinline包中的定义，在输入流中留下以下内容：

\expandafter\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter\expandafter
\@protected@testopt\mintinline\\mintinline{}{\ab}

注意，这\\mintinline只是一个 token。我们再玩一遍：

\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\EXPANDAFTER\expandafter\EXPANDAFTER\expandafter
\@protected@testopt\mintinline\\mintinline{}{\ab}

这里\@protected@testop展开一次；它在 LaTeX 内核中的定义是

% latex.ltx, line 619:
\def\@protected@testopt#1{%%
  \ifx\protect\@typeset@protect
    \expandafter\@testopt
  \else
    \@x@protect#1%
  \fi}

因此，在删除已经使用的\expandafter标记并替换扩展的宏之后，输入流具有

\expandafter\expandafter\expandafter\expandafter
\ifx\protect\@typeset@protect\expandafter\@testopt
\else\@x@protect\mintinline\fi\\mintinline{}{\ab}

第一个\expandafter展开了第三个，第三个又展开了\ifx；因为我们处于“正常”位置，所以测试是正确的，所以我们剩下

\expandafter\expandafter\expandafter\@testopt
\else\@x@protect\mintinline\fi\\mintinline{}{\ab}

第一个\expandafter扩展了第三个，第三个又扩展了\else；这很简单：匹配之前的所有内容\fi都消失了：

\expandafter\@testopt\\mintinline{}{\ab}

现在\\mintinline已经扩展；但是它的定义是

> \\mintinline=\long macro:
[#1]#2->\minted@resetoptcmd \setkeys {minted@optcmd}{#1}\def \minted@lang {#2}
\begingroup \let \do \@makeother \dospecials \catcode `\{=1 \catcode `\}=2 
\catcode `\ =\active \@ifnextchar \bgroup {\minted@inline@iii }{\catcode 
`\{=12\catcode `\}=12 \minted@inline@i }.

根据 LaTeX 如何处理使用可选参数定义的命令。由于\\mintinline 想要之后[，错误

! Use of \\mintinline doesn't match its definition.
\mintinline ...@testopt \mintinline \\mintinline {
                                                  }

已发出。

有没有更好的方法呢？有的，例如记住以下语法\mintinline：

\mintinline[<options>]{<language>}{<verbatim material>}

那串 33 个\expandafter标记简直是荒谬的：相反，这样做可以：

\begingroup\def\temp{\endgroup\mintinline{c}}% use your preferred language
\expandafter\temp\expandafter{\ab}

但是，如果\ab被认为包含特殊字符，它们可能不会得到特殊处理，因为它们已经被标记化。

Answer