% \iffalse meta-comment balanced on line 108
% ltxdocext.dtx: package to extend the ltxdoc class of standard LaTeX
% Copyright (c) 2008 Arthur Ogawa
%
% Disclaimer
%   This file is distributed WITHOUT ANY WARRANTY;
%   without even the implied warranty of
%   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
% License
%   You may distribute this file under the conditions of the 
%   LaTeX Project Public License 1.3 or later 
%   (http://www.latex-project.org/lppl.txt).
% ReadMe
%   For the documentation and more detailed instructions for
%   installation, typeset this document with \LaTeX.
% Maintenance Status
%   This work has the LPPL maintenance status "maintained";
%   Current Maintainer of this work is Arthur Ogawa.
%
% This work consists of the main source file ltxdocext.dtx
% and the derived files
%    ltxdocext.sty, ltxdocext.pdf, ltxdocext.ins, ltxdocext.drv.
% Distribution:
%    CTAN:macros/latex/contrib/revtex/
%
% Unpacking:
%    tex ltxdocext.dtx
%
% Documentation:
%    latex ltxdocext.dtx; ...
%
%    Program calls to get the documentation (example):
%       pdflatex ltxdocext.dtx
%       makeindex -s gind.ist ltxdocext.idx
%       makeindex -s gglo.ist -o ltxdocext.gls ltxdocext.glo
%       pdflatex ltxdocext.dtx
%       makeindex -s gind.ist ltxdocext.idx
%       pdflatex ltxdocext.dtx
%
% Installation:
%    TDS:doc/latex/revtex/
%    TDS:source/latex/revtex/
%    TDS:tex/latex/revtex/
%
% Thanks, Heiko!
%    This method of letting a single .dtx file serve as both
%    documentation (via latex) and installer (via tex) follows
%    the example of Heiko Oberdiek. Thanks!
%<*ignore>
\begingroup
  \def\x{LaTeX2e}%
\expandafter\endgroup
\ifcase
 0\expandafter\ifx\csname processbatchFile\endcsname\relax\else1\fi\ifx\fmtname\x\else 1\fi
 \relax
\else
 \csname fi\endcsname
%</ignore>
%<*install>
\input docstrip
\preamble

This is a generated file;
altering it directly is inadvisable;
instead, modify the original source file.
See the URL in the file README.

License
   You may distribute this file under the conditions of the 
   LaTeX Project Public License 1.3 or later 
   (http://www.latex-project.org/lppl.txt).
   
   This file is distributed WITHOUT ANY WARRANTY; 
   without even the implied warranty of MERCHANTABILITY 
   or FITNESS FOR A PARTICULAR PURPOSE.

\endpreamble
\askforoverwritefalse
\keepsilent
 \generate{%
  %{ignore}
% \usedir{tex/latex/revtex}%
  \file{ltxdocext.sty}{%
   \from{ltxdocext.dtx}{package,kernel}%
  }%
  \file{acrofont.sty}{\from{ltxdocext.dtx}{fonts}}%
 }%
\ifToplevel{
\Msg{***********************************************************}
\Msg{*}
\Msg{* To finish the installation, please move}
\Msg{*    ltxdocext.sty}
\Msg{* into a directory searched by TeX;}
\Msg{* in a TDS-compliant installation:}
\Msg{* texmf/tex/macros/latex/revtex/.}
\Msg{*}
\Msg{* To produce the documentation,
       run ltxdocext.dtx through LaTeX.}
\Msg{*}
\Msg{* Happy TeXing}
\Msg{***********************************************************}
}
\endbatchfile
%</install>
%<*ignore>
\fi
%</ignore>
% \fi
%
% \GetFileInfo{ltxdocext.dtx}
%
% \iffalse ltxdoc klootch
%<*ltxdocext>
%%%  @LaTeX-file{
%%%     filename        = "ltxdocext.dtx",
%%%     version         = "1.1c",
%%%     date            = "2020/09/30",
%%%     author          = "Arthur Ogawa (mailto:arthur_ogawa at sbcglobal.net),
%%%                        commissioned by the American Physical Society.
%%%                        ",
%%%     copyright       = "Copyright (C) 1999, 2008 Arthur Ogawa,
%%%                        distributed under the terms of the 
%%%                        LaTeX Project Public License, see
%%%                        ftp://ctan.tug.org/macros/latex/base/lppl.txt
%%%                        ",
%%%     address         = "Arthur Ogawa,
%%%                        USA",
%%%     telephone       = "",
%%%     FAX             = "",
%%%     email           = "mailto colon arthur_ogawa at sbcglobal.net",
%%%     codetable       = "ISO/ASCII",
%%%     keywords        = "latex, ltxdoc",
%%%     supported       = "yes",
%%%     abstract        = "extensions to the ltxdoc class",
%%%  }
%</ltxdocext>
% \fi
%
% \iffalse ltxdoc klootch
% The following references the \file{README} file,
% which contains basic information about this package.
% The contents of this file are generated when
% you typeset the programmer's documentation.
% Search on "{filecontents*}{README}" to locate it.
% \fi\input{README}%
%
% \subsection{Bill of Materials}
%
% Following is a list of the files in this distribution arranged
% according to provenance.
%
% \subsubsection{Primary Source}%
% One single file generates all.
%\begin{verbatim}
%ltxdocext.dtx
%\end{verbatim}
%
% \subsubsection{Generated by \texttt{latex ltxdocext.dtx}}%
% Typesetting the source file under pdflatex
% generates the readme and the documentation.
%\begin{verbatim}
%README ltxdocext.pdf
%\end{verbatim}
%
% \subsubsection{Generated by \texttt{tex ltxdocext.ins}}%
% Typesetting this file with \TeX\ generates
% the package file.
%\begin{verbatim}
%ltxdocext.sty    acrofont.sty
%\end{verbatim}
%
% \subsubsection{Documentation}%
% The following are the online documentation:
% \begin{verbatim}
%ltxdocext.pdf
% \end{verbatim}
%
% \subsubsection{Auxiliary}%
% The following are auxiliary files generated
% in the course of running \LaTeX:
% \begin{verbatim}
%ltxdocext.aux ltxdocext.idx ltxdocext.ind ltxdocext.log ltxdocext.toc
% \end{verbatim}
%
% \section{Code common to all modules}%
%
% We want to require only one place in this file
% where the version number is stated,
% and we also want to ensure that the version
% number is embedded into every generated file.
%
% Now we declare that
% these files can only be used with \LaTeXe.
% An appropriate message is displayed if
% a different \TeX{} format is used.
%    \begin{macrocode}
%<*driver|package|fonts>
\NeedsTeXFormat{LaTeX2e}[1995/12/01]%
%</driver|package|fonts>
%    \end{macrocode}
% As desired, the following modules all
% take common version information:
%    \begin{macrocode}
%<package>\ProvidesFile{ltxdocext.sty}%
%<fonts>\ProvidesFile{acrofont.sty}%
%<*driver>
\expandafter\ProvidesFile\expandafter{\jobname.dtx}%
%</driver>
%    \end{macrocode}
%
% The following line contains, for once and for all,
% the version and date information.
% By various means, this information is reproduced
% consistently in all generated files and in the
% typeset documentation.
%    \begin{macrocode}
%<version>
 [2020/09/30 1.1c ltxdoc extensions package]% \fileversion
%    \end{macrocode}
%
%
% \section{The driver module \texttt{doc}}
%
% This module, consisting of the present section,
% typesets the programmer's documentation,
% generating the \file{README} as required.
%
% Because the only uncommented-out lines of code at the beginning of
% this file constitute the \file{doc} module itself,
% we can simply typeset the \file{.dtx} file directly,
% and there is thus rarely any need to
% generate the ``doc'' {\sc docstrip} module.
% Module delimiters are nonetheless required so that
% this code does not find its way into the other modules.
%
% The \enve{document} command concludes the typesetting run.
%
%    \begin{macrocode}
%<*driver>
%    \end{macrocode}
%
% \subsection{The Preamble}
% The programmers documentation is formatted
% with the \classname{ltxdoc} document class, with local customizations,
% and with the usual code line indexing.
%    \begin{macrocode}
\documentclass[draft]{ltxdoc}
\RequirePackage{ltxdocext}%
\RequirePackage[colorlinks=true,linkcolor=blue]{hyperref}%
\makeatletter
\@ifundefined{package@font}{}%
  {\expandafter\RequirePackage\expandafter{\csname package@font\endcsname}}
\makeatother
\CodelineIndex\EnableCrossrefs % makeindex -s gind.ist ltxdocext
\RecordChanges % makeindex -s gglo.ist -o ltxdocext.gls ltxdocext.glo
%    \end{macrocode}
%
% \subsubsection{Docstrip and info directives}
%    We use so many {\sc docstrip} modules that we set the
%    \texttt{StandardModuleDepth} counter to 1.
%    \begin{macrocode}
\setcounter{StandardModuleDepth}{1}
%    \end{macrocode}
%    The following command retrieves the date and version information
%    from this file.
%    \begin{macrocode}
\expandafter\GetFileInfo\expandafter{\jobname.dtx}%
%    \end{macrocode}
%
% \subsection{The ``Read Me'' File}
% As promised above, here is the contents of the
% ``Read Me'' file. That file serves a double purpose,
% since it also constitutes the beginining of the
% programmer's documentation. What better thing, after
% all, to have appear at the beginning of the
% typeset documentation?
%
% A good discussion of how to write a ReadMe file can be found in
% Engst, Tonya, ``Writing a ReadMe File? Read This''
% \emph{MacTech} October 1998, p. 58.
%
% Note the appearance of the
% \cmd\StopEventually\ command, which marks the
% dividing line between the user documentation
% and the programmer documentation.
%
% The usual user will not be asked to
% do a full build, not to speak
% of the bootstrap.
% Instructions for carrying these processes
% begin the programmer's manual.
%
%    \begin{macrocode}
\begin{filecontents*}[overwrite]{README}
\title{%
 Extensions to the \classname{ltxdoc} class%
 \thanks{%
  This file has version number \fileversion,
  last revised \filedate.%
 }%
 \thanks{%
  Version \fileversion\ \copyright\ 2008 The American Physical Society
 }%
}%
\author{%
Arthur Ogawa%
 \thanks{\texttt{mailto:arthur\_ogawa at sbcglobal.net}}%
}%
%\iffalse
% For version number and date,
% search on "\fileversion" in the .dtx file,
% or see the end of the README file.
%\fi

\maketitle

This file embodies the \classname{ltxdocext} package,
the implementation and its user documentation.

The distribution point for this work is
\url{publish.aps.org/revtex},
which contains prebuilt runtime files, documentation, and full source, 
ready to add to a TDS-compliant \TeX\ installation.

The \classname{ltxdocext} package was commissioned by the American Physical Society
and is distributed under the terms of the \LaTeX\ Project Public License,
the same license under which all the portions of \LaTeX\ itself are distributed.
Please see \url{http://ctan.tug.org/macros/latex/base/lppl.txt} for details.

To use this document class, you must have a working
\TeX\ installation equipped with \LaTeXe\ 
and possibly pdftex and Adobe Acrobat Reader or equivalent.

To install, retrieve the distribution,
unpack it into a directory on the target computer,
and move the files \file{ltxdocext.sty} and \file{acrofont.sty}
into a location in your filesystem where they will be found by \LaTeX.

If you will be using the \classname{acrofont} package, you must
also install the virtual fonts
\file{zpsynocmrv}, \file{zptmnocmr},
\file{zptmnocmrm}, and \file{zpzcnocmry}.
The corresponding \file{.tfm}, \file{.vf}, and \file{.vpl}
files are part of this distribution.

To use, read the user documentation \file{ltxdocext.pdf}.
The \file{.dtx} file, \file{ltxdocext.dtx}, constitutes
in itself an instance of use of the \classname{ltxdocext}
package and the \classname{acrofont} package.

\tableofcontents

\section{Processing Instructions}

The package files \file{ltxdocext.sty} and \file{acrofont.sty}
are generated from this file, \file{ltxdocext.dtx},
using the {\sc docstrip} facility of \LaTeX
via |tex ltxdocext.dtx| (Note: do \emph{not} use \LaTeX\ for this step).
The typeset documentation that you are now reading is generated from
the same file by typesetting it with \LaTeX\ or pdftex
via |latex ltxdocext.dtx| or |pdflatex ltxdocext.dtx|.

\subsection{Build Instructions}

You may bootstrap this suite of files solely from \file{ltxdocext.dtx}.
Prepare by installing \LaTeXe\ (and either tex or pdftex) on your computer,
then carry out the following steps:
\begin{enumerate}
\item
Within an otherwise empty directory,
typeset \file{ltxdocext.dtx} with \TeX\ or pdftex;
thereby generating the package file \file{ltxdocext.sty},
and the package file \file{acrofont.sty}.
Make sure that {\sc docstrip} receives permission
to overwrite existing versions of these packages.
\item
Now
typeset \file{ltxdocext.dtx} with \LaTeX\ or pdflatex;
you will obtain the typeset documentation you are now reading,
along with
the file \file{README}.

Note: you will have to run \LaTeX, then 
\file{makeindex} \texttt{-s gind.ist ltxdocext.idx}, then
\file{makeindex} \texttt{-s gglo.ist -o ltxdocext.gls ltxdocext.glo}, then
\LaTeX\ again in order to obtain a valid index and table of contents.
\item
Install the following files into indicated locations within your 
TDS-compliant \texttt{texmf} tree (you may need root access):
\begin{itemize}
\item
\file{$TEXMF/}\file{tex/}\file{latex/}\file{revtex/}\classname{ltxdocext.sty} and
\file{$TEXMF/}\file{tex/}\file{latex/}\file{revtex/}\classname{acrofont.sty}
\item
\file{$TEXMF/}\file{source/}\file{latex/}\file{revtex/}\classname{ltxdocext.dtx}
\item
\file{$TEXMF/}\file{doc/}\file{latex/}\file{revtex/}\classname{ltxdocext.pdf}
\end{itemize}
where \file{$TEXMF/} stands for \file{texmf-local/}, or some other \texttt{texmf} tree
in your installation.
\item
Run \texttt{mktexlsr} on \file{$TEXMF/} (you may need root access).
\item
Build and installation are now complete; 
now put a \cmd\usepackage\texttt{\{ltxutil\}} in your document preamble!
\end{enumerate}
\end{filecontents*}
%    \end{macrocode}
%
% \subsection{The Document Body}
%
% Here is the document body, containing only a
% \cmd\DocInput\ directive---referring to this very file.
% This very cute self-reference is a common \classname{ltxdoc} idiom.
%    \begin{macrocode}
\begin{document}%
\expandafter\DocInput\expandafter{\jobname.dtx}%
\PrintChanges
\end{document}
%</driver>
%    \end{macrocode}
%
% \section{Using the \classname{ltxdoc} and \classname{acrofont} packages}%
% These packages are an adjunct to the 
% standard \LaTeX\ \classname{ltxdoc} class and may be 
% simply invoked as follows:
%\begin{verbatim}
%\documentclass[draft]{ltxdoc}
%\RequirePackage{ltxdocext}%
%\RequirePackage{acrofont}%
%\CodelineIndex\EnableCrossrefs
%\end{verbatim}
%
% Your document should simply cleave to the standards of the
% \classname{ltxdoc} class, with extensions and alterations as noted.
%
% \subsection{Extensions to the \classname{ltxdoc} class}%
%
% \subsubsection{Extensions to the \env{verbatim} environment and \cs{verb} command}%
%
% The delimiters \verb$<<$ and \verb$>>$ within the scope of the verbatim environment
% or within the argument of the \cmd\verb\ command produce
% italics surrounded by angle brackets.
% This typographic convention usually indicates 
% \emph{metalanguage}, i.e., a placeholder.
%
% To obtain the angle bracket character per se, 
% double the character, viz., ``\verb$the delimiter \verb+<<<<+$''.
%
% \subsubsection{The -\texttt{matter} Commands Work}
% The sectioning commands \cmd\frontmatter, \cmd\mainmatter, and \cmd\backmatter
% of the standard \LaTeX\ \classname{book} class are operative in the
% \classname{ltxdoc} class.
%
% \subsubsection{The \cs{GetFileInfo} command}\label{sec:GetFileInfo}
% You can use the \cmd\GetFileInfo\ command to extract 
% the date, version, and file info of a file which has registered itself
% via the \cmd\ProvidesFile\ or \cmd\ProvidesClass\ command 
% (employing the optional argument thereto).
% 
% For instance, if your document contains the following:
%\begin{verbatim}
%\RequirePackage{ltxdocext}%
%\GetFileInfo{ltxdocext.sty}%
%\end{verbatim}
% then the following control sequence names will have 
% a value corresponding to that package's \cmd\ProvidesFile\
% command: 
% \cmd\filedate: the file's date,
% \cmd\fileversion: the file's version, and
% \cmd\fileinfo: the file's info.
%
% \subsubsection{Self-Indexing Commands}%
% Certain commands automatically produce an index entry
% (or several related entries) according to the meaning.
%
% \begin{unnumtable}
% \begin{tabular}{ll}
% meta-text         &\cmd\marg\arg{text}\\
% command           &\cmd\cmd\cmd\csname\\
% environment name  &\cmd\env\arg{name}\\
% \cmd\begin\verb`{foo}`&\cmd\envb\arg{foo}\\
% \cmd\end\verb`{foo}`  &\cmd\enve\arg{foo}\\
% argument          &\cmd\arg\arg{name}\\
% optional          &\cmd\oarg\arg{name}\\
% filename          &\cmd\file\arg{name}\\
% url               &\cmd\url\arg{name}\\
% document class    &\cmd\classname\arg{name}\\
% document substyle &\cmd\substyle\arg{name}\\
% class option      &\cmd\classoption\arg{name}
% \end{tabular}
% \end{unnumtable}
%
% \subsubsection{Unnumbered Tables}%
%
% When your documentation requires the use of an unnumbered table,
% use the \env{unnumtable} environment:
% \begin{verbatim}
%\begin{unnumtable}
%\begin{tabular}{ll}
%<table rows>
%\end{tabular}
%\end{unnumtable}
% \end{verbatim}
%
% \subsubsection{Structuring Tables}%
% The commands \cmd\toprule, \cmd\colrule, and \cmd\botrule
% allow you to mark the beginning of the column heads
% the beginning of the table body, and the end of
% the table body, respectively.
% In context, 
% \begin{verbatim}
%\begin{tabular}{ll}
%\toprule
%<table head rows>
%\colrule
%<table rows>
%\botrule
%\end{tabular}
% \end{verbatim}
%
% \subsubsection{A Sectioning Command Below \cs{subsection}}%
% The \cmd\subsubsection\ command is defined.
%
%
% \subsection{Alterations to the \classname{ltxdoc} class}%
% The following involve no new markup, but they 
% do change the appearance of your formatted documentation:
% \begin{enumerate}
% \item
% Using the \classname{acrofont} package causes your 
% document to be formatted using the standard 
% Acrobat fonts to the greatest extent possible.
% This means that for most documents, Computer Modern
% is not used at all.
% Math that unavoidable must use CM still exists, however.
% \item
% An index will be produced at the end of the document
% without your needing to explicitly mark it up, and
% it will have an entry in the TOC.
% \item
% The \env{quote} environment has a slightly smaller left margin.
% \item
% Array columns are set tight by default.
% \item
% A host of \cmd\DoNotIndex\ directives are invoked.
% I intend this list to grow to encompass 
% even more commands. Send me your suggestions.
% \end{enumerate}
%
%
%
%\StopEventually{}
%
% \section{Extensions to the ltxdoc class}
% The \file{package} {\sc docstrip} module comprises the 
% package \classname{ltxdocext.sty}, which provides extensions
% to the standard \LaTeX\ \classname{ltxdoc} class.
%
% \subsection{Beginning of the \file{package} {\sc docstrip} module}
%  This portion of code is only present in the \LaTeX\ package (\texttt{.sty} file),
% not in the kernel portion.
%    \begin{macrocode}
%<*package>
\def\class@name{ltxdocext}%
\expandafter\PackageInfo\expandafter{\class@name}{%
 An extension to the \protect\LaTeXe\space ltxdoc class
 by A. Ogawa (arthur\_ogawa sbcglobal.net)%
}%
%</package>
%    \end{macrocode}
%
% \subsection{Beginning of the \file{kernel} {\sc docstrip} module}
%
% The bulk of the code is the kernel portion; a brief tail of \file{package} code then follows.
%    \begin{macrocode}
%<*kernel>
%    \end{macrocode}
%
% \subsection{Incorporate \classname{ltxguide.cls} extensions}
%
% Code extracted from \classname{ltxguide.cls}, by Alan Jeffrey.
% ``This code stolen from \classname{ltxguide.cls}:
% Some hacks with verbatim... NB: this would be better done with the
% verbatim package, but this document has to run on any \LaTeX
% installation.''
%    \begin{macrocode}
\RequirePackage{verbatim}%
\let\o@verbatim\verbatim
\def\verbatim{%
  \ifhmode\unskip\par\fi
% \nopagebreak              % Overridden by list penalty
  \ifx\@currsize\normalsize
     \small
  \fi
  \o@verbatim
}%
%    \end{macrocode}
%
% Here we extend the font-setting command to include making \texttt{<>} active
% (i.e., adjusting the input encoding).
%    \begin{macrocode}
\renewcommand \verbatim@font {%
  \normalfont \ttfamily
  \catcode`\<=\active
  \catcode`\>=\active
}%
%    \end{macrocode}
%
% Make \verb$|...|$ a synonym for \cmd\verb\verb$|...|$.
%    \begin{macrocode}
\RequirePackage{shortvrb}
\AtBeginDocument{%
 \MakeShortVerb{\|}%
}%
%    \end{macrocode}
%
% Make active bracket characters produce italics surrounded by angle brackets
% (used in \env{verbatim} and \cmd\verb).
% \verb|<<| produces a less-than, and \verb|>>| produces a greater-than.
%    \begin{macrocode}
\begingroup
  \catcode`\<=\active
  \catcode`\>=\active
  \gdef<{\@ifnextchar<\@lt\@meta}
  \gdef>{\@ifnextchar>\@gt\@gtr@err}
  \gdef\@meta#1>{\marg{#1}}
  \gdef\@lt<{\char`\<}
  \gdef\@gt>{\char`\>}
\endgroup
\def\@gtr@err{%
   \ClassError{ltxguide}{%
      Isolated \protect>%
   }{%
      In this document class, \protect<...\protect>
      is used to indicate a parameter.\MessageBreak
      I've just found a \protect> on its own.
      Perhaps you meant to type \protect>\protect>?
   }%
}
\def\verbatim@nolig@list{\do\`\do\,\do\'\do\-}
%    \end{macrocode}
% End of code stolen from \file{ltxguide.cls}. Thanks, Alan.
%
% Add functionality from doc.dtx:
% (code stolen from doc.dtx):
%    \begin{macrocode}
\def\GetFileInfo#1{%
  \def\filename{#1}%
  \def\@tempb##1 ##2 ##3\relax##4\relax{%
    \def\filedate{##1}%
    \def\fileversion{##2}%
    \def\fileinfo{##3}}%
  \edef\@tempa{\csname ver@#1\endcsname}%
  \expandafter\@tempb\@tempa\relax? ? \relax\relax}
%    \end{macrocode}
% (end of code stolen from doc.dtx. Thanks FMi.)
%
% Various forms of self-indexing commands:
%    \begin{macrocode}
\DeclareRobustCommand{\marg}[1]{%
 \meta{#1}%
 \index{#1=\string\meta{#1} placeholder}\index{placeholder>#1=\string\meta{#1}}%
}%
\DeclareRobustCommand\meta[1]{%
 \mbox{\LANGLE\itshape#1\/\RANGLE}%
}%
\def\LANGLE{$\langle$}%
\def\RANGLE{$\rangle$}%
\DeclareRobustCommand{\arg}[1]{%
 {\ttfamily\string{}\meta{#1}{\ttfamily\string}}%
 \index{#1=\string\ttt{#1}, argument}\index{argument>#1=\string\ttt{#1}}%
}%
\let\oarg\undefined
\DeclareRobustCommand{\oarg}[1]{%
 {\ttfamily[%]
  }\meta{#1}{\ttfamily%[
 ]}%
 \index{#1=\string\ttt{#1}, optional argument}%
 \index{argument, optional>#1=\string\ttt{#1}}%
}%
\DeclareRobustCommand\cmd{\begingroup\makeatletter\@cmd}%
\long\def\@cmd#1{%
 \endgroup
 \cs{\expandafter\cmd@to@cs\string#1}%
 \expandafter\cmd@to@index\string#1\@nil
}%
\def\cmd@to@cs#1#2{\char\number`#2\relax}%
\def\cmd@to@index#1#2\@nil{%
 \index{#2=\string\cmd#1#2}%\index{command>#2=\string\cmd#1#2}%
}%
\DeclareRobustCommand\cs[1]{{\ttfamily\char`\\#1}}%
\def\scmd#1{%
 \cs{\expandafter\cmd@to@cs\string#1}%
 \expandafter\scmd@to@index\string#1\@nil
}%
\def\scmd@to@index#1#2\@nil#3{%
 \index{\string$#3=\string\cmd#1#2---#3}%
%\index{command>\string$#3=\string\cmd#1#2---#3}%
}%
\DeclareRobustCommand\env{\name@idx{environment}}%
\DeclareRobustCommand\envb[1]{%
 {\ttfamily\string\begin\string{}\env{#1}{\ttfamily\string}}%
}%
\DeclareRobustCommand\enve[1]{{\ttfamily\string\end\string{}\env{#1}{\ttfamily\string}}}%
\DeclareRobustCommand{\file}{\begingroup\@sanitize\@file}%
\long\def\@file#1{\endgroup
 {\ttfamily#1}%
 \index{#1=\string\ttt{#1}}\index{file>#1=\string\ttt{#1}}%
}%
\DeclareRobustCommand\substyle{\name@idx{document substyle}}%
\DeclareRobustCommand\classoption{\name@idx{document class option}}%
\DeclareRobustCommand\classname{\name@idx{document class}}%
\def\name@idx#1#2{%
 {\ttfamily#2}%
 \index{#2\space#1=\string\ttt{#2}\space#1}\index{#1>#2=\string\ttt{#2}}%
}%
\DeclareRobustCommand\url@ltxdocext{\begingroup\catcode`\/\active\catcode`\.\active\catcode`\:\active\@url}%
\AtBeginDocument{%
 \ifx\url\undefined\let\url\url@ltxdocext\fi
}%
\def\@url#1{%
 \url@break{\ttfamily#1}%
 \url@char\edef\@tempa{#1=\string\url{#1}}%
 \expandafter\index\expandafter{\@tempa}%
 \expandafter\index\expandafter{\expandafter u\expandafter r\expandafter l\expandafter >\@tempa}%
 \endgroup
}%
{\catcode`\:\active\aftergroup\def\aftergroup:}{\active@colon}%
\def\colon@break{\colon@char\allowbreak}%
\def\colon@char{:}%
{\catcode`\/\active\aftergroup\def\aftergroup/}{\active@slash}%
\def\slash@break{\slash@char\allowbreak}%
\def\slash@char{/}%
{\catcode`\.\active\aftergroup\def\aftergroup.}{\active@dot}%
\def\dot@break{\dot@char\allowbreak}%
\def\dot@char{.}%
\def\url@break{\let\active@slash\slash@break\let\active@dot\dot@break\let\active@colon\colon@break}%
\def\url@char{\let\active@slash\slash@char\let\active@dot\dot@char\let\active@colon\colon@char}%
%    \end{macrocode}
%
% \subsection{Changes to the base class of the ltxdoc class}
% Modify \env{theindex} environment so that it produces a TOC entry
%    \begin{macrocode}
\renewenvironment{theindex}
               {\if@twocolumn
                  \@restonecolfalse
                \else
                  \@restonecoltrue
                \fi
                \columnseprule \z@
                \columnsep 35\p@
\def\see##1##2{\textit{See} ##1}%
\def\seealso##1##2{\textit{See also} ##1}%
\long\def\cmd##1{\cs{\expandafter\cmd@to@cs\string##1}}%
\def\@url##1{\url@break\ttt{##1}\endgroup}%
\def\ttt{\begingroup\@sanitize\ttfamily\@ttt}%
\def\@ttt##1{##1\endgroup}%
\mathchardef\save@secnumdepth\c@secnumdepth
\c@secnumdepth\m@ne
                \twocolumn[\section{\indexname}]%
%               \@mkboth{\MakeUppercase\indexname}%
%                       {\MakeUppercase\indexname}%
\c@secnumdepth\save@secnumdepth
                \thispagestyle{plain}\parindent\z@
                \parskip\z@ \@plus .3\p@\relax
                \let\item\@idxitem}
               {\if@restonecol\onecolumn\else\clearpage\fi}
\renewenvironment{quote}
               {\list{}{%
                \leftmargin1em\relax
                \rightmargin\leftmargin
                }%
                \item\relax}
               {\endlist}
%    \end{macrocode}
%
% \subsection{Extensions to the base class of \classname{ltxdoc.cls}}
%
% Matter commands from \classname{book.cls}
%    \begin{macrocode}
\newif\if@mainmatter
\newif\if@openright
\@openrighttrue
\DeclareRobustCommand\frontmatter{%
  \cleartorecto
  \@mainmatterfalse
  \pagenumbering{roman}%
}%
\DeclareRobustCommand\mainmatter{%
  \cleartorecto
  \@mainmattertrue
  \pagenumbering{arabic}%
}%
\DeclareRobustCommand\backmatter{%
  \if@openright
    \cleartorecto
  \else
    \clearpage
  \fi
  \@mainmatterfalse
}%
\ifx\undefined\cleartorecto
 \def\cleartorecto{\cleardoublepage}%
\fi
%    \end{macrocode}
%
% Unnumbered tables
%
% \begin{environment}{unnumtable}
% An unnumbered table does not float.
%    \begin{macrocode}
\def\@to{to}%
\newenvironment{unnumtable}{%
 \par
 \addpenalty\predisplaypenalty
 \addvspace\abovedisplayskip
 \hbox\@to\hsize\bgroup\hfil\ignorespaces
  \let\@Hline\@empty
}{%
 \unskip\hfil\egroup
 \penalty\postdisplaypenalty
 \vskip\belowdisplayskip
 \aftergroup\ignorespaces
 \@endpetrue
}%
%    \end{macrocode}
% \end{environment}
%
% Emulate \cmd\toprule\ and friends
%    \begin{macrocode}
\providecommand\toprule{\hline\hline}%
\providecommand\colrule{\\\hline}%
\providecommand\botrule{\\\hline\hline}%
%    \end{macrocode}
%
% Define sectioning command below \cmd\subsubsection.
%    \begin{macrocode}
\DeclareRobustCommand\subsubsubsection{%
 \@startsection{subsubsection}{4}%
  {\z@}{-15\p@\@plus-5\p@\@minus-2\p@}%
  {5\p@}{\normalfont\normalsize\itshape}%
}%
%    \end{macrocode}
%
% \subsection{In lieu of \file{ltxdoc.cfg}}
%    We don't want everything to appear in the index
%    \begin{macrocode}
\DoNotIndex{\',\.,\@M,\@@input,\@Alph,\@alph,\@addtoreset,\@arabic}
\DoNotIndex{\@badmath,\@centercr,\@cite}
\DoNotIndex{\@dotsep,\@empty,\@float,\@gobble,\@gobbletwo,\@ignoretrue}
\DoNotIndex{\@input,\@ixpt,\@m,\@minus,\@mkboth}
\DoNotIndex{\@ne,\@nil,\@nomath,\@plus,\roman,\@set@topoint}
\DoNotIndex{\@tempboxa,\@tempcnta,\@tempdima,\@tempdimb}
\DoNotIndex{\@tempswafalse,\@tempswatrue,\@viipt,\@viiipt,\@vipt}
\DoNotIndex{\@vpt,\@warning,\@xiipt,\@xipt,\@xivpt,\@xpt,\@xviipt}
\DoNotIndex{\@xxpt,\@xxvpt,\\,\ ,\addpenalty,\addtolength,\addvspace}
\DoNotIndex{\advance,\ast,\begin,\begingroup,\bfseries,\bgroup,\box}
\DoNotIndex{\bullet}
\DoNotIndex{\cdot,\cite,\CodelineIndex,\cr,\day,\DeclareOption}
\DoNotIndex{\def,\DisableCrossrefs,\divide,\DocInput,\documentclass}
\DoNotIndex{\DoNotIndex,\egroup,\ifdim,\else,\fi,\em,\endtrivlist}
\DoNotIndex{\EnableCrossrefs,\end,\end@dblfloat,\end@float,\endgroup}
\DoNotIndex{\endlist,\everycr,\everypar,\ExecuteOptions,\expandafter}
\DoNotIndex{\fbox}
\DoNotIndex{\filedate,\filename,\fileversion,\fontsize,\framebox,\gdef}
\DoNotIndex{\global,\halign,\hangindent,\hbox,\hfil,\hfill,\hrule}
\DoNotIndex{\hsize,\hskip,\hspace,\hss,\if@tempswa,\ifcase,\or,\fi,\fi}
\DoNotIndex{\ifhmode,\ifvmode,\ifnum,\iftrue,\ifx,\fi,\fi,\fi,\fi,\fi}
\DoNotIndex{\input}
\DoNotIndex{\jobname,\kern,\leavevmode,\let,\leftmark}
\DoNotIndex{\list,\llap,\long,\m@ne,\m@th,\mark,\markboth,\markright}
\DoNotIndex{\month,\newcommand,\newcounter,\newenvironment}
\DoNotIndex{\NeedsTeXFormat,\newdimen}
\DoNotIndex{\newlength,\newpage,\nobreak,\noindent,\null,\number}
\DoNotIndex{\numberline,\OldMakeindex,\OnlyDescription,\p@}
\DoNotIndex{\pagestyle,\par,\paragraph,\paragraphmark,\parfillskip}
\DoNotIndex{\penalty,\PrintChanges,\PrintIndex,\ProcessOptions}
\DoNotIndex{\protect,\ProvidesClass,\raggedbottom,\raggedright}
\DoNotIndex{\refstepcounter,\relax,\renewcommand}
\DoNotIndex{\rightmargin,\rightmark,\rightskip,\rlap,\rmfamily}
\DoNotIndex{\secdef,\selectfont,\setbox,\setcounter,\setlength}
\DoNotIndex{\settowidth,\sfcode,\skip,\sloppy,\slshape,\space}
\DoNotIndex{\symbol,\the,\trivlist,\typeout,\tw@,\undefined,\uppercase}
\DoNotIndex{\usecounter,\usefont,\usepackage,\vfil,\vfill,\viiipt}
\DoNotIndex{\viipt,\vipt,\vskip,\vspace}
\DoNotIndex{\wd,\xiipt,\year,\z@}
\DoNotIndex{\next}
%    \end{macrocode}
%
% Direct \classname{ltxdoc} to produce an index.
%    \begin{macrocode}
\AtEndDocument{\PrintIndex\PrintChanges}%
%    \end{macrocode}
%
% \subsection{Extension to \LaTeX's \env{filecontents} Environment}
% We want to
% coax the version number into \env{filecontents}-generated files.
% Note that we expect \cmd\fileversion\ and \cmd\filedate\ to
% hold the needed information. For this to be the case,
% your document should execute the \cmd\GetFileInfo\ command
% (as documented in section~\ref{sec:GetFileInfo}) before
% any instances of \env{filecontents}.
%    \begin{macrocode}
\makeatletter
\def\endfilecontents{%
 \immediate\write\reserved@c{%
  \string\iffalse\space ltxdoc klootch^^J%
  \ifx\undefined\fileversion\else
  \ifx\undefined\filedate\else
  This file has version number \fileversion, last revised \filedate.%
  \fi\fi
  \string\fi
 }%
 \immediate\closeout\reserved@c
 \def\T##1##2##3{%
  \ifx##1\@undefined\else
    \@latex@warning@no@line{##2 has been converted to Blank ##3e}%
  \fi
 }%
 \T\L{Form Feed}{Lin}%
 \T\I{Tab}{Spac}%
 \immediate\write\@unused{}%
}%
\expandafter\let\csname endfilecontents*\endcsname\endfilecontents
\makeatother
%    \end{macrocode}
%
% Alter formatting in arrays; set them tight.
%    \begin{macrocode}
\setlength\arraycolsep{0pt}%
%    \end{macrocode}
%
% \subsection{End of the \file{kernel} {\sc docstrip} module}
%
%    \begin{macrocode}
%</kernel>
%    \end{macrocode}
%
% \subsection{Tail of the \file{package} {\sc docstrip} module}
% Here is the remainder of the package code.
%    \begin{macrocode}
%<*package>
%    \end{macrocode}
% Currently, there is little. 
%    \begin{macrocode}
%</package>
%    \end{macrocode}
%
%
% \section{Font Package for Acrobat Compatability}%
% The package \classname{acrofont}
% substitutes Acrobat-standard fonts for Computer Modern where possible,
% even in math mode.
% Documents typeset with this package in effect will require as little
% downloaded font data as possible, but will not be exemplars of
% fine math typesetting.
%
% \subsection{Beginning of the \file{fonts} {\sc docstrip} module}
% The document class module comprises this and the next
% four sections.
% \begin{macro}{\class@base}
% We define in exactly one spot the base class.
% Typically that class will be one of \classname{book},
% \classname{article}, or \classname{report}.
% The base class effectively defines the use and the markup scheme
% of the class of documents to be handled by this class.
%
% This class is a variant of the standard \LaTeX\ book class:
% \url{ftp://ctan.tug.org/tex-archive/macros/latex/unpacked}.
%    \begin{macrocode}
%<*fonts>
\def\class@name{ltxdocext}%
\expandafter\ClassInfo\expandafter{\class@name}{%
 Written for \protect\LaTeXe\space
 by A. Ogawa (arthur_ogawa at sbcglobal.net)%
}%
%    \end{macrocode}
% \end{macro}
%
% \subsection{Variants on psfonts packages}%
% The following uses \file{times.sty} from \url{/packages/psnfss/psfonts.dtx}
%    \begin{macrocode}
\RequirePackage{times}%
%    \end{macrocode}
%
% The following uses \file{mathptm.sty} from \url{/packages/psnfss/psfonts.dtx}
%    \begin{macrocode}
\RequirePackage{mathptm}%
%    \end{macrocode}
%
% The following is a customization of \file{ot1ptmcm.fd}.
% The virtual font referred to here \file{zptmnocmr} is 
% a variant of Sebastian Rahtz's \file{zptmcmr}, but with
% even more glyphs moved from CM to Acrobat-standard fonts.
%    \begin{macrocode}
\DeclareFontFamily{OT1}{ptmcm}{}
\DeclareFontShape{OT1}{ptmcm}{m}{n}{
   <-> zptmnocmr
}{}
\DeclareFontShape{OT1}{ptmcm}{l}{n}{<->ssub * ptmnocm/m/n}{}
%    \end{macrocode}
%
% The following is a customization of \file{omlptmcm.fd}
% The virtual font referred to here \file{zptmnocmrm} is 
% a variant of Sebastian Rahtz's \file{zptmcmrm}, but with
% even more glyphs moved from CM to Acrobat-standard fonts.
%    \begin{macrocode}
\DeclareFontFamily{OML}{ptmcm}{\skewchar \font =127}
\DeclareFontShape{OML}{ptmcm}{m}{it}{
   <-> zptmnocmrm
}{}
\DeclareFontShape{OML}{ptmcm}{l}{it}{<->ssub * ptmcm/m/it}{}
\DeclareFontShape{OML}{ptmcm}{m}{sl}{<->ssub * ptmcm/m/it}{}
\DeclareFontShape{OML}{ptmcm}{l}{sl}{<->ssub * ptmcm/m/sl}{}
%    \end{macrocode}
%
% The following is a customization of \file{omspzccm.fd}
% The virtual font referred to here \file{zpzcnocmry} is 
% a variant of Sebastian Rahtz's \file{zpzccmry}, but with
% even more glyphs moved from CM to Acrobat-standard fonts.
%    \begin{macrocode}
\DeclareFontFamily{OMS}{pzccm}{}
\DeclareFontShape{OMS}{pzccm}{m}{n}{
   <-> zpzcnocmry
}{}% cmsy10 Symbol Zapf Chancery Medium-Italic Times-Roman
\DeclareFontShape{OMS}{pzccm}{l}{n}{<->ssub * pzccm/m/n}{}
%    \end{macrocode}
%
% The following is a customization of \file{omxpsycm.fd}
% The virtual font referred to here \file{zpsynocmrv} is 
% a variant of Sebastian Rahtz's \file{zpsycmrv}, but with
% even more glyphs moved from CM to Acrobat-standard fonts.
%    \begin{macrocode}
\DeclareFontFamily{OMX}{psycm}{}
\DeclareFontShape{OMX}{psycm}{m}{n}{
   <-> zpsynocmrv
}{}
\DeclareFontShape{OMX}{psycm}{l}{n}{<->ssub * psycm/m/n}{}
%
\DeclareFontEncoding{8r}{}{}% from file: 8renc.def
\DeclareFontFamily{8r}{cmr}{\hyphenchar\font45 }% from file: 8rcmr.fd
\DeclareFontShape{8r}{cmr}{m}{n}{
 <-> cmr10
}{}
%    \end{macrocode}
%
% \subsection{Font definition files}%
%
% The following forces \LaTeX\ to do now what it would do anyway:
% load the `font definition' information for the fonts that we
% use. In this way, we prepare for faster processing through
% the \cmd\dump\ of a preformatted macro package that will not
% need to read in any packages or font definitions from disk.
%    \begin{macrocode}
\input{8rphv.fd}%
\input{8rptm.fd}%
\input{ot1phv.fd}%
\input{ot1ptm.fd}%
\input{t1ptm.fd}%
%    \end{macrocode}
%
% \subsection{More math substitutions}%
%
% The following definitions arrange to get certain glyphs from the
% text font instead of out of math pi fonts.
% In particular, the copyright and registered symbols
% are single glyphs instead of composites involving
% the big circle from the \file{cmsy} font.
%    \begin{macrocode}
 \def\eightRChar#1{{\def\encodingdefault{8r}\fontencoding\encodingdefault\selectfont\char"#1}}%
 \def\LANGLE{$<$}%{\eightRChar{8B}}%
 \def\RANGLE{$>$}%{\eightRChar{9B}}%
%\def\ASTER{\eightRChar{2A}}%
%\def\DAGGER{\eightRChar{86}}%
%\def\DDAGGER{\eightRChar{87}}%
 \def\BULLET{\eightRChar{95}}%
%\def\SECTION{\eightRChar{A7}}%
%\def\PARAGRAPH{\eightRChar{B6}}%
 \def\VERTBAR{\eightRChar{7C}}%
 \def\COPYRIGHT{\eightRChar{A9}}%
 \def\REGISTERED{\eightRChar{AE}}%
%    \end{macrocode}
%
%    \begin{macrocode}
 \def\textbar{\VERTBAR}%
 \def\textbullet{\BULLET}%
 \def\textcopyright{\COPYRIGHT}%
 \def\textregistered{\REGISTERED}%
%    \end{macrocode}
%
% I have removed \cmd\ensuremath\ from the following definition, and
% all commands like \cmd\mathsection have been converted to
% e.g., \cmd\textsection.
%    \begin{macrocode}
\def\@makefnmark{\@thefnmark}%
\def\@fnsymbol#1{{\ifcase#1\or *\or \dagger\or \ddagger\or
   \textsection\or \textparagraph\or \|\or **\or \dagger\dagger
   \or \ddagger\ddagger \else\@ctrerr\fi}}
%    \end{macrocode}
%
% \subsection{End of the \file{fonts} {\sc docstrip} module}
% Here ends the module.
%    \begin{macrocode}
%</fonts>
%    \end{macrocode}
%
%
% \section{Programming Conventions}%
% In writing the above code, I cleave to certain conventions, noted
% here.
% My goal in explaining them is to encourage others maintaining this
% body of code to consider following them as well.
% The benefits are twofold:
% Some of the coding conventions aim to avoid programming pitfalls;
% following them reduces maintenance costs.
% Others make the code easier to read; following these eases the
% process of understanding how the code works.
%
% And, for my part, I prefer to read code of this type.
%
% \subsection{Whitespace Conventions}%
% Exactly where code lines break and indent, and where additional
% whitespace is inserted is explained here.
% \begin{itemize}
% \item
% Each new macro definition or register assignment begins a new line.
% Therefore, \cmd\def, \cmd\newcommand, and their ilk will start in column~1.
% \item
% Code is indented one space for each level of nesting within braces
% \verb|{}|.
% \item
% Likewise, if possible, for \cmd\if\dots and matching \cmd\fi.
% \item
% However, the closing brace or \cmd\fi\ is outdented by one so that it
% falls
% at the same level of indentation as its matching brace or \cmd\if,
% and it appears alone on its line.
% \item
% Use of the |tab| character is deprecated
% (tabs are not standardized across all applications and operating
% systems).
% \item
% Lines of code are limited to 72 characters.
% I follow this convention mostly to ease the transmission of files
% via email (a deprecated practice) and to accomodate people with
% small monitors.
% But \classname{ltxdoc} output looks better with the shorter lines, too.
% \item
% Extraneous whitespace in the replacement part of a macro definition 
% is avoided by using the comment character |%|. 
% In most cases, if falling at the end of a line of code,
% a brace will be immediately followed by a comment character,
% as will the macro parameter |#1| and any one-letter control sequence,
% like |\\|.
% \item
% Extraneous whitespace in the package file is also avoided.
% When \TeX\ reads in the .sty file, it will process \cmd\def s, and other commands,
% but will not process blank spaces. 
% This practice is simply a discipline. You don't need to do this.
% But sometimes \TeX\ has to read in a file while it is in horizontal mode,
% at which point this practice is essential.
% \end{itemize}
% These conventions taken together are illustrated by the following:
% \begin{verbatim}
%\def\prepdef#1#2{%
% \@ifxundefined#1{\toks@{}}{\toks@\expandafter{#1}}%
% \toks@ii{#2}%
% \edef#1{\the\toks@ii\the\toks@}%
%}%
% \end{verbatim}
% In the above, the definition of \cmd\prepdef\ would not fit on a single
% line,
% and required breaking. The first and last lines have matching braces,
% and are a the same level of indentation, with the last line containing
% a single brace.
%
% Each of the three intervening lines has balanced braces and is
% indented by one space. Each line that would otherwise end in a single
% brace character is terminated by a comment character.
%
% Some coders rely on the fact that a space character seen by \TeX's
% scanner while in vertical mode is a no-op.
% Be that as it may, I eliminate them unless actually intentional.
%
% \subsection{Conventions For Procedures}%
% Here are some of my preferences when writing procedures:
% \begin{itemize}
%
% \item
% I dislike defining a macro within another macro, especially when the
% pattern part is non-nil.
% You know, you are not saving much space in |mem| when you do this,
% right?
% You do save space in the hash table and the string pool, though.
% On the other hand, we are not dealing with small \TeX\ engines
% anymore; Team \LaTeX\ has made sure of this.
%
% \item
% If two or more macros have very similar replacement parts, consider
% layering.
%
% \item
% Macros may perform parsing, may maintain tokens or registers, or may
% set type (produce marks). I try to avoid combining the three functions
% in a single macro.
%
% \item
% When a procedure both does assignments and sets type, I try to have a
% clean separations between the two activities. Try to avoid:
% \begin{verbatim}
% \vskip10pt
% \parindent=0pt
% \leavevmode
% \end{verbatim}
%
% \item
% The Boolean calculus (cf. \cmd\@ifx)
% is very useful and produces code that executes nicely.
% Using it also helps avoid your having to debug problems where
% \cmd\if\dots\ and \cmd\fi\ are not properly balanced
% (a nightmare, in case you have not already experienced it).
%
% \end{itemize}
%
% \subsection{Conventions For \LaTeX}%
% Team \LaTeX\ make certain recommendations in \file{clsguide.tex}.
% Ones that I particularly pay attention to are:
% \begin{itemize}
%
% \item
% For the sake of ``color safety'',
% use \cmd\sbox\ rather than \cmd\setbox, \cmd\mbox\ rather than \cmd\hbox, and
% \cmd\parbox\ or \env{minipage} rather than \cmd\vbox.
%
% \item
% Use \cmd\newcommand\ and \cmd\newenvironment\ to declare user-level commands
% and environments. Avoid the idiom \cmd\def\cmd\foo, \cmd\def\cmd\endfoo\ to define
% an environment.
% Ideally, all user-level markup could be extracted from the
% document class by grepping on \cmd\newcommand\ and \cmd\newenvironment.
%
% \item
% Prefer to use \cmd\setlength\ to assign registers.
%
% \end{itemize}
% I cannot help but notice that much of the code of \LaTeX\ itself fails
% to comply with many of the coding recommendations of Team \LaTeX.
%
% \Finale
% \iffalse Here ends the programmer's documentation.\fi
% \endinput
%
\endinput
%%EOF
