lib/texinputs/comment.sty
author wenzelm
Wed, 31 Mar 2021 11:24:46 +0200
changeset 73772 d3f2038198ae
parent 55224 197c36bb30ad
permissions -rw-r--r--
clarified (again): local tip could be actually more recent;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Comment.sty   version 3.6, October 1999
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%
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% Purpose:
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% selectively in/exclude pieces of text: the user can define new
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% comment versions, and each is controlled separately.
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% Special comments can be defined where the user specifies the
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% action that is to be taken with each comment line.
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%
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% Author
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%    Victor Eijkhout
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%    Department of Computer Science
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%    University of Tennessee
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%    107 Ayres Hall
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%    Knoxville TN 37996
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%    USA
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%
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%    victor@eijkhout.net
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%
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% This program is free software; you can redistribute it and/or
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% modify it under the terms of the GNU General Public License
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% as published by the Free Software Foundation; either version 2
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% of the License, or (at your option) any later version.
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% 
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% This program is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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% GNU General Public License for more details.
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%
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% For a copy of the GNU General Public License, write to the 
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% Free Software Foundation, Inc.,
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% 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA,
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% or find it on the net, for instance at
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% http://www.gnu.org/copyleft/gpl.html
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% This style can be used with plain TeX or LaTeX, and probably
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% most other packages too.
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%
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% Usage: all text included between
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%    \comment ... \endcomment
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% or \begin{comment} ... \end{comment}
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% is discarded. 
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%
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% The opening and closing commands should appear on a line
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% of their own. No starting spaces, nothing after it.
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% This environment should work with arbitrary amounts
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% of comment, and the comment can be arbitrary text.
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%
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% Other `comment' environments are defined by
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% and are selected/deselected with
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% \includecomment{versiona}
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% \excludecoment{versionb}
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%
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% These environments are used as
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% \versiona ... \endversiona
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% or \begin{versiona} ... \end{versiona}
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% with the opening and closing commands again on a line of 
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% their own.
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%
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% LaTeX users note: for an included comment, the
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% \begin and \end lines act as if they don't exist.
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% In particular, they don't imply grouping, so assignments 
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% &c are not local.
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%
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% Special comments are defined as
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% \specialcomment{name}{before commands}{after commands}
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% where the second and third arguments are executed before
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% and after each comment block. You can use this for global
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% formatting commands.
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% To keep definitions &c local, you can include \begingroup
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% in the `before commands' and \endgroup in the `after commands'.
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% ex:
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% \specialcomment{smalltt}
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%     {\begingroup\ttfamily\footnotesize}{\endgroup}
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% You do *not* have to do an additional
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% \includecomment{smalltt}
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% To remove 'smalltt' blocks, give \excludecomment{smalltt}
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% after the definition.
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%
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% Processing comments can apply processing to each line.
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% \processcomment{name}{each-line commands}%
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%    {before commands}{after commands}
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% By defining a control sequence 
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% \def\Thiscomment##1{...} in the before commands the user can
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% specify what is to be done with each comment line.
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% BUG this does not work quite yet BUG
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%
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% Trick for short in/exclude macros (such as \maybe{this snippet}):
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%\includecomment{cond}
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%\newcommand{\maybe}[1]{}
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%\begin{cond}
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%\renewcommand{\maybe}[1]{#1}
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%\end{cond}
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%
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% Basic approach of the implementation:
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% to comment something out, scoop up  every line in verbatim mode
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% as macro argument, then throw it away.
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% For inclusions, in LaTeX the block is written out to
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% a file \CommentCutFile (default "comment.cut"), which is
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% then included.
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% In plain TeX (and other formats) both the opening and
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   103
% closing comands are defined as noop.
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%
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   105
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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   106
% Changes in version 3.1
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% - updated author's address
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   108
% - cleaned up some code
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   109
% - trailing contents on \begin{env} line is always discarded
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   110
%  even if you've done \includecomment{env}
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   111
% - comments no longer define grouping!! you can even
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   112
%   \includecomment{env}
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%   \begin{env}
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%   \begin{itemize}
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   115
%   \end{env}
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   116
%  Isn't that something ...
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   117
% - included comments are written to file and input again.
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   118
% Changes in 3.2
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   119
% - \specialcomment brought up to date (thanks to Ivo Welch).
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% Changes in 3.3
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% - updated author's address again
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% - parametrised \CommentCutFile
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   123
% Changes in 3.4
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   124
% - added GNU public license
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   125
% - added \processcomment, because Ivo's fix (above) brought an
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   126
%   inconsistency to light.
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   127
% Changes in 3.5
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   128
% - corrected typo in header.
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% - changed author email
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% - corrected \specialcomment yet again.
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   131
% - fixed excludecomment of an earlier defined environment.
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% Changes in 3.6
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   133
% - The 'cut' file is now written more verbatim, using \meaning;
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   134
%   some people reported having trouble with ISO latin 1, or umlaute.sty.
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   135
% - removed some \newif statements.
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   136
%   Has this suddenly become \outer again?
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%
197c36bb30ad include comment.sty 3.6 which still works with plain tex, in contrast to later 3.7 which is only for latex (slow due to file snippets) -- see also 30781cc78fc6;
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   138
% Known bugs:
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   139
% - excludecomment leads to one superfluous space
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   140
% - processcomment leads to a superfluous line break
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   141
%
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   142
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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   143
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   144
\def\makeinnocent#1{\catcode`#1=12 }
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   145
\def\csarg#1#2{\expandafter#1\csname#2\endcsname}
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   146
\def\latexname{lplain}\def\latexename{LaTeX2e}
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   147
\newwrite\CommentStream
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\def\CommentCutFile{comment.cut}
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\def\ProcessComment#1% start it all of
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   151
   {\begingroup
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    \def\CurrentComment{#1}%
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    \let\do\makeinnocent \dospecials 
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    \makeinnocent\^^L% and whatever other special cases
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    \endlinechar`\^^M \catcode`\^^M=12 \xComment}
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   156
%\def\ProcessCommentWithArg#1#2% to be used in \leveledcomment
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   157
%   {\begingroup
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   158
%    \def\CurrentComment{#1}%
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   159
%    \let\do\makeinnocent \dospecials 
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   160
%    \makeinnocent\^^L% and whatever other special cases
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   161
%    \endlinechar`\^^M \catcode`\^^M=12 \xComment}
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   162
{\catcode`\^^M=12 \endlinechar=-1 %
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 \gdef\xComment#1^^M{%
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   164
    \expandafter\ProcessCommentLine}
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 \gdef\ProcessCommentLine#1^^M{\def\test{#1}
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   166
      \csarg\ifx{End\CurrentComment Test}\test
197c36bb30ad include comment.sty 3.6 which still works with plain tex, in contrast to later 3.7 which is only for latex (slow due to file snippets) -- see also 30781cc78fc6;
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   167
          \edef\next{\noexpand\EndOfComment{\CurrentComment}}%
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   168
      \else \ThisComment{#1}\let\next\ProcessCommentLine
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   169
      \fi \next}
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   170
}
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   172
\def\CSstringmeaning#1{\expandafter\CSgobblearrow\meaning#1}
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   173
\def\CSstringcsnoescape#1{\expandafter\CSgobbleescape\string#1}
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   174
{\escapechar-1
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   175
\expandafter\expandafter\expandafter\gdef
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   176
  \expandafter\expandafter\expandafter\CSgobblearrow
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   177
    \expandafter\string\csname macro:->\endcsname{}
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   178
}
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   179
\def\CSgobbleescape#1{\ifnum`\\=`#1 \else #1\fi}
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   180
\def\WriteCommentLine#1{\def\CStmp{#1}%
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   181
    \immediate\write\CommentStream{\CSstringmeaning\CStmp}}
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   183
% 3.1 change: in LaTeX and LaTeX2e prevent grouping
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   184
\if 0%
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   185
\ifx\fmtname\latexename 
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    0%
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\else \ifx\fmtname\latexname 
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          0%
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   189
      \else 
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          1%
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   191
\fi   \fi
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   192
%%%%
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   193
%%%% definitions for LaTeX
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   194
%%%%
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   195
\def\AfterIncludedComment
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   196
   {\immediate\closeout\CommentStream
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   197
    \input{\CommentCutFile}\relax
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   198
    }%
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   199
\def\TossComment{\immediate\closeout\CommentStream}
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\def\BeforeIncludedComment
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   {\immediate\openout\CommentStream=\CommentCutFile
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    \let\ThisComment\WriteCommentLine}
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\def\includecomment
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 #1{\message{Include comment '#1'}%
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    \csarg\let{After#1Comment}\AfterIncludedComment
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    \csarg\def{#1}{\BeforeIncludedComment
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        \ProcessComment{#1}}%
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    \CommentEndDef{#1}}
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\long\def\specialcomment
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 #1#2#3{\message{Special comment '#1'}%
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    % note: \AfterIncludedComment does \input, so #2 goes here!
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    \csarg\def{After#1Comment}{#2\AfterIncludedComment#3}%
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    \csarg\def{#1}{\BeforeIncludedComment\relax
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          \ProcessComment{#1}}%
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    \CommentEndDef{#1}}
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\long\def\processcomment
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 #1#2#3#4{\message{Lines-Processing comment '#1'}%
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    \csarg\def{After#1Comment}{#3\AfterIncludedComment#4}%
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    \csarg\def{#1}{\BeforeIncludedComment#2\relax
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          \ProcessComment{#1}}%
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    \CommentEndDef{#1}}
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\def\leveledcomment
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 #1#2{\message{Include comment '#1' up to level '#2'}%
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    %\csname #1IsLeveledCommenttrue\endcsname
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    \csarg\let{After#1Comment}\AfterIncludedComment
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    \csarg\def{#1}{\BeforeIncludedComment
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        \ProcessCommentWithArg{#1}}%
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    \CommentEndDef{#1}}
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\else 
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%%%%
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%%%%plain TeX and other formats
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%%%%
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\def\includecomment
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 #1{\message{Including comment '#1'}%
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    \csarg\def{#1}{}%
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    \csarg\def{end#1}{}}
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\long\def\specialcomment
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 #1#2#3{\message{Special comment '#1'}%
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    \csarg\def{#1}{\def\ThisComment{}\def\AfterComment{#3}#2%
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           \ProcessComment{#1}}%
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    \CommentEndDef{#1}}
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\fi
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%%%%
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%%%% general definition of skipped comment
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%%%%
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\def\excludecomment
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 #1{\message{Excluding comment '#1'}%
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    \csarg\def{#1}{\let\AfterComment\relax
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           \def\ThisComment####1{}\ProcessComment{#1}}%
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    \csarg\let{After#1Comment}\TossComment
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    \CommentEndDef{#1}}
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\if 0%
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\ifx\fmtname\latexename 
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    0%
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\else \ifx\fmtname\latexname 
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          0%
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      \else 
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          1%
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\fi   \fi
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% latex & latex2e:
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\def\EndOfComment#1{\endgroup\end{#1}%
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    \csname After#1Comment\endcsname}
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\def\CommentEndDef#1{{\escapechar=-1\relax
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    \csarg\xdef{End#1Test}{\string\\end\string\{#1\string\}}%
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    }}
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\else
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% plain & other
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\def\EndOfComment#1{\endgroup\AfterComment}
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\def\CommentEndDef#1{{\escapechar=-1\relax
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    \csarg\xdef{End#1Test}{\string\\end#1}%
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    }}
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\fi
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\excludecomment{comment}
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\endinput