将 \comment 或 \begin{comment} 添加到 \AtBeginDocument？

Question 1

您可以在之后的序言中的某处使用以下代码\documentclass。

\def\doskipA{\begin{document}\end{document}}
\ifx\doskip\relax \expandafter\doskipA\fi

Answer

您可以在之后的序言中的某处使用以下代码\documentclass。

\def\doskipA{\begin{document}\end{document}}
\ifx\doskip\relax \expandafter\doskipA\fi

Question 2

好的，我终于找到了一些方法，尽管可能并不理想。下面的 MWE 行为如下：

如果使用进行编译pdflatex test.tex，则会忽略该comment内容，并且文档会完全编译；但日志中会生成这两个警告（不知道如何修复）：

(\end occurred inside a group at level 2)

### semi simple group (level 2) entered at line 86 (\begingroup)
### semi simple group (level 1) entered at line 86 (\begingroup)
### bottom level...

如果使用进行编译pdflatex "\let\doskip\relax\input{test.tex}"；则有一个\excludecomment定义，称为SKIPLINES，并\begin{document}自动启动它；代码编译时不会出现警告，并且只会排版\end{SKIPLINES}和之间的段\begin{SKIPLINES}（请注意顺序），即此处的\lipsum[5]。此外，类似这样的消息将输出到终端：
```
...
test: macro:->, macro:->\end{SKIPLINES}
noend macro:-> macro:->\end{document}
test: macro:->\end{document}, macro:->\end{SKIPLINES}
yesend
```

我猜，这需要\excludecomment避免额外的（？）分组。但是，仍然需要一些技巧，因此代码包括和的修改版本{comment}。\excludecomment特别\ProcessCommentLine是，正如@UlrikeFischer 指出的那样，如果在读取时 Latex 处于“注释模式” \end{document}，它将被跳过，从而导致错误；因此重新定义\ProcessCommentLine的还会检查作为停止注释模式的标记，然后如果遇到该条件，\end{document}则重新执行正确的操作。\end{document}

这意味着，人们应该能够在\doskip模式下随意添加\end{SKIPLINES}和\begin{SKIPLINES}定义可编译区域的部分，而不必担心它们是否正确关闭\end{document}：一对\end{SKIPLINES}和\begin{SKIPLINES}应该可以工作，就像没有它们（或带有额外的）的文档一样好\end{SKIPLINES}。

显然，这不是一个真正合适的解决方案（这个解决方案不适用于\inputted 文件），所以我希望最终会出现一个更博学的答案；但是现在，这里是 MWE（对于造成的混乱，我们深表歉意）：

\documentclass[11pt]{book}
\usepackage{lipsum}
\usepackage{trace}

\newif\ifSKIPLINESAct % if active
\ifx\doskip\relax
  \typeout{DOSKIP}
  \usepackage{etoolbox}
  \usepackage{comment}
  \usepackage{xstring}
  \def\excludecommentB
   #1{\message{Excluding comment '#1'}%
      %\csarg\newif{if#1Act}% declare globally; http://tex.stackexchange.com/questions/228994/handling-a-conditionally-defined-newif-nested-in-an-ifx-conditional
      \csarg\def{#1}{\endgroup \message{Excluding '#1' comment.}%
          \csname #1Acttrue\endcsname
          \begingroup
             \DefaultCutFileName \def\ProcessCutFile{}%
             \def\ThisComment####1{}\ProcessComment{#1}}%
      \csarg\def{After#1Comment}{%
        \global\csname #1Actfalse\endcsname% must globalize - inside a group here!
        \CloseAndInputCutFile \endgroup}
      \CommentEndDef{#1}}
  % redef this too:
  \csarg\xdef{EndDocTest}{\string\end\string{document\string}}
%   \showme\EndDocTest
  {\catcode`\^^M=12 \endlinechar=-1 %
   \gdef\xComment#1^^M{\ProcessCommentLine}
   \gdef\ProcessCommentLine#1^^M{\def\test{#1}
        \typeout{test: \meaning\test, \expandafter\meaning \csname End\CurrentComment Test\endcsname}
        \csarg\ifx{End\CurrentComment Test}\test
            \edef\next{\endgroup\noexpand\EndOfComment{\CurrentComment}}%
        \else \ThisComment{#1}\let\next\ProcessCommentLine
        \fi%
        % also add for end document; use \IfStrEq else catcodes could be a problem
        \IfStrEq*{\EndDocTest}{\test}{%
            %\traceon%
            \typeout{yesend}%
            \def\next{%\endgroup\noexpand\EndOfComment{\CurrentComment}%
            \endgroup\noexpand\EndOfComment{\noexpand\CurrentComment}% % must add \noexpand to \CurrentComment, else it leaks and gets typeset in the doc!
            %\SKIPLINESActfalse% no; use:
            \AfterSKIPLINESComment% % both sets false and ends group
            \enddocument%
            }%
        }{\typeout{noend \meaning\test\space\meaning\EndDocTest}%\ThisComment{#1}\let\next\ProcessCommentLine% don't execute here, just typeout
        }%
        \next}
  }
  \excludecommentB{SKIPLINES} % define, also \ifSKIPLINESAct
  %\AtEndPreamble{ % here causes ! LaTeX Error: Missing \begin{document}.
  \AtBeginDocument{%
    % \expandafter\begin{SKIPLINES}\relax
    \begin{SKIPLINES}
  } % ! Extra \endgroup.
  %\AtEndDocument{\end{SKIPLINES}} % ! LaTeX Error: \begin{document} ended by \end{SKIPLINES}. % redefine instead?
  %% no need for this:
  % \global\let\oldenddocument\enddocument
  % \gdef\enddocument{% redefine
  %   %\ifSKIPLINESAct\expandafter\end\expandafter{SKIPLINES}\fi
  %   \oldenddocument%
  % }
\else
  % still need this, when calling without \doskip:
  \makeatletter
  \newenvironment{SKIPLINES}{%
  \begingroup\def\@currenvir{document}%
  }{%
  % comment.sty: % sabotage LaTeX's environment testing \begingroup\def\@currenvir{#1}\end{#1}
  \begingroup\def\@currenvir{SKIPLINES}%\endgroup
  }
  % \def\endSKIPLINES{\begingroup\def\@currenvir{SKIPLINES}} % nope
  \makeatother
\fi

% \traceon
\begin{document}

\chapter{Some chapter}
\section{Section One}
\lipsum[1-3]

% \traceon
\end{SKIPLINES}
% \traceoff
\lipsum[5]
\begin{SKIPLINES} % will cause ### semi simple group (level 2) entered at line 90 if without \doskip and unclosed, but doc will compile

\lipsum[10]

% \end{SKIPLINES} % if this is uncommented when \doskip, it will allow the next typeout to execute (else they will be gobbled)

% these print to stdout only if \end{SKIPLINES} occured last previously:
\typeout{\meaning\endSKIPLINES}
\ifx\doskip\relax
  \ifSKIPLINESAct\typeout{SKIPLINES Active}\else\typeout{no SKIPLINES}\fi%
\else
\fi

\end{document}
%%ENNDDD

Answer