將 \comment 或 \begin{comment} 加入 \AtBeginDocument？

Question 1

您可以在序言中的某處使用以下代碼\documentclass。

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

Answer

您可以在序言中的某處使用以下代碼\documentclass。

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

Question 2

好吧，我終於到達了某個地方，儘管可能不理想。下面的 MWE 的行為如下：

如果使用進行編譯pdflatex test.tex，則這些comment內容將被忽略，並且文件將完全編譯；但日誌中會產生這兩個警告（不知道如何解決）：

(\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...

pdflatex "\let\doskip\relax\input{test.tex}"如果用;編譯然後有一個\excludecomment定義的，名為SKIPLINES，並\begin{document}自動啟動它；程式碼編譯時不會出現警告，只有\end{SKIPLINES}和之間的段\begin{SKIPLINES}（注意順序）\lipsum[5]才會被排版。類似這樣的訊息也會輸出到終端：
```
...
test: macro:->, macro:->\end{SKIPLINES}
noend macro:-> macro:->\end{document}
test: macro:->\end{document}, macro:->\end{SKIPLINES}
yesend
```

我想，這需要\excludecomment避免額外的（？）分組。然而，仍然需要一些技巧，因此程式碼包括和的{comment}修改\excludecomment版本\ProcessCommentLine。特別是，正如 @UlrikeFischer 所指出的，如果在閱讀時 Latex 處於“評論模式” \end{document}，它將被跳過，從而導致錯誤；因此，重新定義\ProcessCommentLine也會檢查\end{document}是否為停止註釋模式的標記，然後\end{document}在遇到該條件時重新執行正確的操作。

這意味著，人們應該能夠在\doskip模式下隨意添加\end{SKIPLINES}和\begin{SKIPLINES}來定義可編譯區域的部分，而無需擔心它們是否正確關閉\end{document}：一對\end{SKIPLINES}和\begin{SKIPLINES}應該可以工作，就像沒有其中任何一個的文檔（或帶有附加的\end{SKIPLINES}）。

顯然，這不是一個真正正確的解決方案（這個解決方案不適用於\inputted 文件），所以我希望最終會出現一個更博學的答案；但現在，這是 MWE（對於混亂表示抱歉）：

\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