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+% \iffalse meta-comment
+%
+% Copyright 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
+% The LaTeX3 Project and any individual authors listed elsewhere
+% in this file.
+%
+% This file is part of the LaTeX base system.
+% -------------------------------------------
+%
+% It may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+% http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2003/12/01 or later.
+%
+% This file has the LPPL maintenance status "maintained".
+%
+% The list of all files belonging to the LaTeX base distribution is
+% given in the file `manifest.txt'. See also `legal.txt' for additional
+% information.
+%
+% The list of derived (unpacked) files belonging to the distribution
+% and covered by LPPL is defined by the unpacking scripts (with
+% extension .ins) which are part of the distribution.
+%
+% \fi
+% \iffalse
+%
+%<class>\NeedsTeXFormat{LaTeX2e}
+%<class>\ProvidesClass{ltxdoc}
+%<class> [1999/08/08 v2.0u Standard LaTeX documentation class]
+%
+%<*driver>
+\documentclass{ltxdoc}
+\GetFileInfo{ltxdoc.cls}
+\providecommand\dst{\expandafter{\normalfont\scshape docstrip}}
+\title{The file \texttt{ltxdoc.dtx} for use with
+ \LaTeXe.\thanks{This file has version
+ number \fileversion, dated \filedate.}\\[2pt]
+ It contains the code for \texttt{ltxdoc.cls}}
+\date{\filedate}
+\author{David Carlisle}
+\begin{document}
+\maketitle
+ \DocInput{ltxdoc.dtx}
+\end{document}
+%</driver>
+%
+% \fi
+%
+% \CheckSum{415}
+%
+% \changes{v2.0i}{1994/04/29}{Update the documentation.}
+% \changes{v2.0s}{1998/08/17}{(RmS) Documentation fixes.}
+%
+% \section{Documentation of the \LaTeX\ sources}
+%
+% This class file is designed for documenting the \LaTeX\ source files.
+% You may however find it generally useful as a class for typesetting
+% the documentation of files produced in `doc' format.
+%
+% Each documented file in the standard distribution comes with extension
+% |dtx|. The appropriate class package or initex file will be extracted
+% from the source by the docstrip system. Each |dtx| file may be
+% directly processed with \LaTeXe, for example
+%\begin{verbatim}
+% latex2e docclass.dtx
+%\end{verbatim}
+% would produce the documentation of the Class and package interface.
+%
+% Each file that is used in producing the \LaTeXe\ format (ie not
+% including the standard class and packages) will be printed together in
+% one document if you \LaTeX\ the file |sources2e.tex|. This has the
+% advantage that one can produce a full index of macro usage across all
+% the source files.
+%
+% If you need to customise the typesetting of any of these files, there
+% are two options:
+% \begin{itemize}
+% \item You can use \dst\ with the module `driver' to extract a small
+% \LaTeX\ file that you may edit to use whatever class or package
+% options you require, before inputting the source file.
+% \item You can create a file |ltxdoc.cfg|. This configuration file will
+% be read whenever the |ltxdoc| class is used, and so can be used to
+% customise the typesetting of all the source files, without having to
+% edit lots of small driver files.
+%\end{itemize}
+%
+% The second option is usually more convenient. Various possibilities
+% are discussed in the next section.
+%
+% \section{Customisation}
+%
+% The simplest form of customisation is to pass more options to the
+% |article| class which is loaded by |ltxdoc|. For instance if you wish
+% all the documentation to be formated for A4 paper, add the following
+% line to |ltxdoc.cfg|:
+%\begin{verbatim}
+% \PassOptionsToClass{a4paper}{article}
+%\end{verbatim}
+%
+% All the source files are in two parts, separated by |\StopEventually|.
+% The first part (should) contain `user' documentation. The second part
+% is a full documented listing of the source code. The |doc| package
+% provides the command |\OnlyDescription| which suppresses the code
+% listings. This may also be used in the configuration file, but as the
+% |doc| package is read later, you must delay the execution of
+% |\OnlyDescription| until after the |doc| package has been read. The
+% simplest way is to use |\AtBeginDocument|. Thus you could put the
+% following in your |ltxdoc.cfg|.
+%\begin{verbatim}
+% \AtBeginDocument{\OnlyDescription}
+%\end{verbatim}
+%
+%
+% If the full source listing |sources2e.tex| is processed, then an index
+% and change history are produced by default, however indices are not
+% normally produced for individual files.
+%
+% As an example, consider |ltclass.dtx|, which contains the sources for
+% the new class and package interface commands. With no |cfg|
+% file, a 19~page document is produced. With the above configuration
+% a slightly more readable document (4~pages) is produced.
+%
+% Conversely, if you really want to read the source listings in detail,
+% you will want to have an index. Again the index commands provided by
+% the doc package may be used, but their execution must be delayed.
+%\begin{verbatim}
+% \AtBeginDocument{\CodelineIndex\EnableCrossrefs}
+% \AtEndDocument{\PrintIndex}
+%\end{verbatim}
+%
+% The |doc| package writes index files to be sorted using MakeIndex with
+% the |gind| style, so one would then use a command such as
+%\begin{verbatim}
+% makeindex -s gind.ist ltclass.idx
+%\end{verbatim}
+% and re-run \LaTeX.
+%
+% Similarly to print a Change history, you would add
+%\begin{verbatim}
+% \AtBeginDocument{\RecordChanges}
+% \AtEndDocument{\PrintChanges}
+%\end{verbatim}
+% to |ltxdoc.cfg|, and use MakeIndex with a comand such as
+%\begin{verbatim}
+% makeindex -s gglo.ist -o ltclass.gls ltclass.glo
+%\end{verbatim}
+%
+% Finally if you do not want to list all the sections of |source2e.tex|,
+% you can use |\includeonly| in the |cfg| file:
+%\begin{verbatim}
+% \includeonly{ltvers,ltboxes}
+%\end{verbatim}
+%
+% \StopEventually{}
+%
+%
+% \section{Options}
+%
+% \begin{macrocode}
+%<*class>
+\DeclareOption{a5paper}{\@latexerr{Option not supported}%
+ {}}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\DeclareOption*{%
+ \PassOptionsToClass {\CurrentOption}{article}}
+% \end{macrocode}
+%
+% \section{Configuration}
+% Input a local configuration file, if it exists.
+% \begin{macrocode}
+\InputIfFileExists{ltxdoc.cfg}
+ {\typeout{*************************************^^J%
+ * Local config file ltxdoc.cfg used^^J%
+ *************************************}}
+ {}
+% \end{macrocode}
+%
+%
+% \section{Option Processing}
+%
+% \begin{macrocode}
+\ProcessOptions
+% \end{macrocode}
+%
+% \section{Loading article and doc}
+%
+% \begin{macrocode}
+\LoadClass{article}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\RequirePackage{doc}
+% \end{macrocode}
+%
+% Make \verb+|+ be a `short verb' character, but not in the document
+% preamble, where an active character may interfere with packages that
+% are loaded.
+% \begin{macrocode}
+\AtBeginDocument{\MakeShortVerb{\|}}
+% \end{macrocode}
+%
+% As `doc' documents tend to have a lot of monospaced material,
+% Set up some |tt| substitutions to occur silently.
+% \changes{v2.0p}{1995/11/02}{Add font substitutions}
+% \changes{v2.0t}{1999/04/17}{Replaced octal number, CAR}
+% \begin{macrocode}
+\DeclareFontShape{OT1}{cmtt}{bx}{n}{<-> ssub * cmtt/m/n}{}
+\DeclareFontFamily{OMS}{cmtt}{\skewchar\font 48} % '60
+\DeclareFontShape{OMS}{cmtt}{m}{n}{<-> ssub * cmsy/m/n}{}
+\DeclareFontShape{OMS}{cmtt}{bx}{n}{<-> ssub * cmsy/b/n}{}
+% \end{macrocode}
+% This substitution is in the standard fd file, but not silent.
+% \begin{macrocode}
+\DeclareFontShape{OT1}{cmss}{m}{it}{<->ssub*cmss/m/sl}{}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\CodelineNumbered
+\DisableCrossrefs
+% \end{macrocode}
+%
+% Increase the text width slightly so that width the standard fonts
+% 72 columns of code may appear in a |macrocode| environment.
+% \changes{v2.0c}{1994/03/15}{Set \cs{textwidth}.}
+% \begin{macrocode}
+\setlength{\textwidth}{355pt}
+% \end{macrocode}
+%
+% Increase the marginpar width slightly, for long command names.
+% And increase the left margin by a similar amount
+% \changes{v2.0l}
+% {1994/05/25}{Increase \cs{marginparwidth}}
+% \changes{v2.0q}{1995/11/28}
+% {Increase \cs{marginparwidth} and page margin.}
+% \begin{macrocode}
+\addtolength\marginparwidth{30pt}
+\addtolength\oddsidemargin{20pt}
+\addtolength\evensidemargin{20pt}
+% \end{macrocode}
+%
+%
+% \begin{macrocode}
+\setcounter{StandardModuleDepth}{1}
+% \end{macrocode}
+%
+% \section{Useful abbreviations}
+%
+% |\cmd{\foo}| Prints |\foo| verbatim. It may be used inside moving
+% arguments. |\cs{foo}| also prints |\foo|, for those who prefer that
+% syntax. (This second form may even be used when |\foo| is |\outer|).
+% \begin{macro}{\cmd}
+% \changes{v2.0k}{1994/05/21}{New definition, so \cmd\{ works.}
+% \begin{macro}{\cs}
+% \changes{v2.0d}{1994/03/17}{Add \cs{cs}}
+% \begin{macrocode}
+\def\cmd#1{\cs{\expandafter\cmd@to@cs\string#1}}
+\def\cmd@to@cs#1#2{\char\number`#2\relax}
+\DeclareRobustCommand\cs[1]{\texttt{\char`\\#1}}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \changes{v2.0r}{1996/01/11}{Removed \cs{star} since useless pr/2039}
+%
+% \begin{macro}{\marg}
+% \changes{v2.0d}{1994/03/17}{Add \cs{marg}}
+% |\marg{text}| prints \marg{text}, `mandatory argument'.
+% \begin{macrocode}
+\providecommand\marg[1]{%
+ {\ttfamily\char`\{}\meta{#1}{\ttfamily\char`\}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\oarg}
+% |\oarg{text}| prints \oarg{text}, `optional argument'.
+% \begin{macrocode}
+\providecommand\oarg[1]{%
+ {\ttfamily[}\meta{#1}{\ttfamily]}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\parg}
+% |\parg{te,xt}| prints \parg{te,xt}, `picture mode argument'.
+% \changes{v2.0h}{1994/04/28}{Add \cs{parg}}
+% \changes{v2.0o}{1995/08/09}{Use \cs{meta} when showing arguments}
+% \begin{macrocode}
+\providecommand\parg[1]{%
+ {\ttfamily(}\meta{#1}{\ttfamily)}}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \section{Old Comments}
+%
+% The \LaTeXe\ sources contain a lot of code inherited from
+% \LaTeX2.09. The comments in this code were not designed to be
+% typeset, and do not contain the necessary \LaTeX\ markup. The
+% \texttt{oldcomments} environment typesets these comments,
+% automatically sensing when any control sequence appears, and
+% implicitly adding the |\verb|. This procedure does not produce
+% particularly beautiful pages, but it allows us to fully document new
+% sections, and have some form of typeset comments on all the old
+% code.
+% \changes{v2.0e}{1994/03/18}{Use a fixed font.}
+%
+% Scan control names and put them in tt.
+% will actually (incorrectly) scan past |\\| but this does not matter as
+% this is almost never followed by a letter in practice.
+% (ie |\\foo|) would put |foo| in |\ttfamily|.
+% \begin{macrocode}
+\def\oc@scan#1{%
+ \ifx\oc@bslash#1%
+ \egroup\let\next\oc@bslash\else
+ \ifcat a\noexpand#1%
+ #1\let\next\oc@scan\else
+ \ifx\oc@percent#1%
+ \def\next{\char`\%\egroup}%
+ \else
+ #1\let\next\egroup
+ \fi\fi\fi\next}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\def\oc@bslash{\bgroup\oc@ttf\char`\\\oc@scan}%
+% \end{macrocode}
+%
+% \begin{macrocode}
+\def\oc@verb#1{%
+ \catcode`#1\active
+ \uccode`\~`#1%
+ \uppercase{\def~{{\oc@ttf\char`#1}}}}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\begingroup
+ \obeyspaces%
+ \catcode`\/=\catcode`\\
+ /catcode`/\/active
+ /catcode`<=/catcode`{%
+ /catcode`>=/catcode`}%
+ /catcode`/{/active%
+ /catcode`/}/active%
+ /gdef/oldc< \end{oldcomments}>%
+ /gdef/begmac< \begin{macrocode}>%
+ /gdef/obs</def <</oc@ttf/ >>>%
+/endgroup%
+% \end{macrocode}
+%
+% \begin{macrocode}
+\begingroup
+ \catcode`\/=\catcode`\\
+ \catcode`\\=13
+ /catcode`/|=/catcode`/%
+ /catcode`/%=13
+ /gdef/oldcomments{|
+ /makeatletter
+ /let/do/oc@verb/dospecials
+ /frenchspacing/@vobeyspaces/obs
+ /raggedright
+ /oc@verb/>|
+ /oc@verb/<|
+ /let\/oc@bslash
+ /let%/oc@percent
+ /obeylines
+ /parindent/z@
+ /ttfamily/expandafter/let/expandafter/oc@ttf/the/font
+ /rmfamily
+ /hfuzz/maxdimen
+ }
+/endgroup
+% \end{macrocode}
+%
+% \begin{macrocode}
+\begingroup
+ \sloppy%
+ \obeylines%
+ \gdef\oc@percent#1^^M{%
+ \ifvmode%
+ \def\commentline{#1}%
+ \ifx\commentline\oldc%
+ \end{oldcomments}%
+ \else%
+ \ifx\commentline\begmac%
+ \begin{macrocode}%
+ \else%
+ \leavevmode%
+ #1^^M%
+ \fi\fi%
+ \else%
+ {\oc@ttf\char`\%}#1^^M%
+ \fi}%
+\endgroup%
+% \end{macrocode}
+%
+%
+% \section{DocInclude}
+%
+% \begin{macrocode}
+\@addtoreset{CodelineNo}{part}
+% \end{macrocode}
+%
+% \begin{macro}{\DocInclude}
+% More or less exactly the same as |\include|, but uses |\DocInput|
+% on a |dtx| file, not |\input| on a |tex| file.
+% \changes{v2.0b}{1994/03/14}{Rename from \cs{docinclude}}
+% \changes{v2.0f}{1994/03/25}{Use \cs{part}}
+% \changes{v2.0u}{1999/08/08}{Also works for .fdd (M. Schroeder)}
+% \begin{macrocode}
+\def\partname{File}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\newcommand*{\DocInclude}[1]{%
+ \relax
+ \clearpage
+ \docincludeaux
+ \IfFileExists{#1.fdd}{\def\currentfile{#1.fdd}}{\def\currentfile{#1.dtx}}%
+ \ifnum\@auxout=\@partaux
+ \@latexerr{\string\include\space cannot be nested}\@eha
+ \else \@docinclude#1 \fi}
+\def\@docinclude#1 {\clearpage
+\if@filesw \immediate\write\@mainaux{\string\@input{#1.aux}}\fi
+\@tempswatrue\if@partsw \@tempswafalse\edef\@tempb{#1}\@for
+\@tempa:=\@partlist\do{\ifx\@tempa\@tempb\@tempswatrue\fi}\fi
+\if@tempswa \let\@auxout\@partaux \if@filesw
+\immediate\openout\@partaux #1.aux
+\immediate\write\@partaux{\relax}\fi
+% \end{macrocode}
+% We need to save (and later restore) various index-related
+% commands which might be changed by the included file.
+% \begin{macrocode}
+\let\@ltxdoc@PrintIndex\PrintIndex
+\let\PrintIndex\relax
+\let\@ltxdoc@PrintChanges\PrintChanges
+\let\PrintChanges\relax
+\let\@ltxdoc@theglossary\theglossary
+\let\@ltxdoc@endtheglossary\endtheglossary
+\part{\currentfile}%
+ {\let\ttfamily\relax
+ \xdef\filekey{\filekey, \thepart={\ttfamily\currentfile}}}%
+\DocInput{\currentfile}%
+\let\PrintIndex\@ltxdoc@PrintIndex
+\let\PrintChanges\@ltxdoc@PrintChanges
+\let\theglossary\@ltxdoc@theglossary
+\let\endtheglossary\@ltxdoc@endtheglossary
+\clearpage
+\@writeckpt{#1}\if@filesw \immediate\closeout\@partaux \fi
+\else\@nameuse{cp@#1}\fi\let\@auxout\@mainaux}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\gdef\codeline@wrindex#1{\if@filesw
+ \immediate\write\@indexfile
+ {\string\indexentry{#1}%
+ {\filesep\number\c@CodelineNo}}\fi}%
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+\let\filesep\@empty
+% \end{macrocode}
+%
+%
+% \begin{macro}{\aalph}
+% Special form of |\alph| as currently |source2e.tex|
+% includes more than 26 files
+% \changes{v2.0n}{1994/05/27}{Use uppercase letters, for makeindex}.
+% \begin{macrocode}
+\def\aalph#1{\@aalph{\csname c@#1\endcsname}}
+\def\@aalph#1{%
+ \ifcase#1\or a\or b\or c\or d\or e\or f\or g\or h\or i\or
+ j\or k\or l\or m\or n\or o\or p\or q\or r\or s\or
+ t\or u\or v\or w\or x\or y\or z\or A\or B\or C\or
+ D\or E\or F\or G\or H\or I\or J\or K\or L\or M\or
+ N\or O\or P\or Q\or R\or S\or T\or U\or V\or W\or
+ X\or Y\or Z\else\@ctrerr\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\docincludeaux}
+% \changes{v2.06}{1994/03/31}{Use \cs{footnotesize} in file key.}
+% \changes{v2.0k}{1994/05/21}{Use \cs{aalph}}
+% \begin{macrocode}
+\def\docincludeaux{%
+ \def\thepart{\aalph{part}}\def\filesep{\thepart-}%
+ \let\filekey\@gobble
+ \g@addto@macro\index@prologue{%
+ \gdef\@oddfoot{\parbox{\textwidth}{\strut\footnotesize
+ \raggedright{\bfseries File Key:} \filekey}}%
+ \let\@evenfoot\@oddfoot}%
+ \global\let\docincludeaux\relax
+ \gdef\@oddfoot{%
+ \expandafter\ifx\csname ver@\currentfile\endcsname\relax
+ File \thepart: {\ttfamily\currentfile} %
+ \else
+ \GetFileInfo{\currentfile}%
+ File \thepart: {\ttfamily\filename} %
+ Date: \filedate\ %
+ Version \fileversion
+ \fi
+ \hfill\thepage}%
+ \let\@evenfoot\@oddfoot}%
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macrocode}
+\def\task#1#2{}
+%</class>
+% \end{macrocode}
+% \Finale
+%