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-%%% ====================================================================
-%%% @LaTeX-doc-source-file{
-%%% filename = "ifoption.dtx",
-%%% version = "1.02",
-%%% date = "2002/03/04",
-%%% time = "16:33:16 EST",
-%%% author = "Michael J Downes",
-%%% address = "American Mathematical Society,
-%%% Publications Technical Group,
-%%% PO Box 6248,
-%%% Providence, RI 02940,
-%%% USA",
-%%% email = "tech-support@ams.org",
-%%% URL = "http://www.ams.org/",
-%%% abstract = "",
-%%% checksum = "06695 170 563 5432",
-%%% docstring = "The checksum field, produced by Robert Solovay's
-%%% checksum utility, gives CRC-16 checksum, lines,
-%%% words, and characters.",
-%%% }
-%%% ====================================================================
-% \iffalse
-%<*driver>
-\NeedsTeXFormat{LaTeX2e}
-\documentclass{amsdtx}
-\providecommand{\mdash}{\textemdash}
-\newcommand{\xt}[1]{\texttt{#1}}
-\providecommand{\qq}[1]{``#1''}
-\providecommand{\lat}[1]{\protect\LaTeX{}}
-\begin{document}
-\title{The \pkg{ifoption} package}
-\author{Michael~J. Downes\\American Mathematical Society}
-\date{Version \fileversion, \filedate}
-\hDocInput{ifoption.dtx}
-\end{document}
-%</driver>
-% \fi
-%
-% \maketitle
-% \section{Introduction}
-%
-% The \pkg{ifoption} package provides an \cn{IfOption} command that
-% has certain advantages over the \cs{@ifpackagewith} command\mdash
-% e.g., default options specified with \cs{ExecuteOptions} test as
-% true rather than false. In order for this to work properly,
-% mutually exclusive options should be specified with
-% \cs{DeclareExclusiveOptions}, another command defined by the
-% \pkg{ifoption} package.
-% \StopEventually{}
-%
-% \section{Implementation}
-% \subsection{Package info}
-%
-% Standard declaration of package name and date.
-% \begin{macrocode}
-\NeedsTeXFormat{LaTeX2e}
-\ProvidesPackage{ifoption}[2002/03/04 v1.02]
-% \end{macrocode}
-%
-% \subsection{Some utility functions}
-%
-% \begin{macrocode}
-\let\@xp\expandafter \let\@nx\noexpand
-% \end{macrocode}
-%
-% \begin{macrocode}
-\def\@True{00}
-\def\@False{01}
-% \end{macrocode}
-%
-% \subsection{Background}
-% See the definitions of \cs{@onefilewithoptions} and
-% \cs{@pushfilename} in the \lat/ kernel.
-%
-% When we have
-%\begin{verbatim}
-%\DeclareOption{foo}{some code}
-%\end{verbatim}
-% in a file named \fn{bar.sty}, \lat/ defines \cs{ds@foo} to contain
-% \emph{some code}. Then if the package is invoked with
-%\begin{verbatim}
-%\usepackage[foo]{bar}
-%\end{verbatim}
-% there are two consequences: \opt{foo} is added to the options list
-% for package \pkg{bar}, which is the control sequence
-% \cs{opt@bar.sty}; and when \cs{ProcessOptions} is called, it
-% executes \cs{ds@option-name} for each option found in the list.
-% When it is finished running the options, \cs{ProcessOptions}
-% undefines all the \cs{ds@whatever} for the current package, which
-% are listed in the control sequence \cs{@declaredoptions}. At the
-% end of \fn{bar.sty}, \cs{@declaredoptions} is globally reset to
-% empty. Thus subordinate packages with options cannot be loaded in
-% the \qq{first half} of a package that also has options, where first half
-% means the area leading up to the \cs{ProcessOptions} call.
-%
-% For mutually exclusive options \xt{a}, \xt{b}, \xt{c}, when option
-% \xt{b} is invoked it should remove all of its sibling options from
-% the options-actually-used list and add itself to the list. For this
-% task we make use of the fact that \cs{ProcessOptions} ends by
-% undefining all the declared options of the current package or
-% documentclass.
-%
-% \begin{macrocode}
-\def\CurrentPackage{\@currname}
-\let\CurrentClass\CurrentPackage
-% \end{macrocode}
-%
-% \begin{macrocode}
-\newcommand{\IfOption}{}
-\def\IfPackageOption{\@ifpackagewith}
-\def\IfClassOption{\@ifclasswith}
-\def\IfOption{%
- \ifx\@currext\@pkgextension \@xp\IfPackageOption
- \else \@xp\IfClassOption
- \fi
- \@currname
-}
-% \end{macrocode}
-%
-% \begin{macrocode}
-\newcommand{\DeclareExclusiveOptions}[1]{%
- \xdef\@declaredoptions{\@declaredoptions,#1}%
- \gdef\ProcessExclusiveOptions{\relax}%
- \@for\CurrOption:=#1\do{%
- \@xp\deo@a\csname ds@\CurrOption\@xp\endcsname\@xp{\CurrOption}{#1}%
- }%
-}
-\def\DeclareBooleanOption{\DeclareExclusiveOptions}
-% \end{macrocode}
-%
-% \begin{macrocode}
-\def\deo@a#1#2#3{%
- \def#1{%
- \g@addto@macro\ProcessExclusiveOptions{\OptionsFalseTrue{#3}{#2}}%
- }%
-}
-% \end{macrocode}
-%
-% \begin{macrocode}
-\def\cull@options#1,{%
- \@xp\ifx\csname ds@#1\@gobble\@percentchar\@empty\endcsname\@False
- \else #1,\fi
- \cull@options
-}
-
-\newcommand{\OptionsFalseTrue}[2]{%
- \begingroup
- \@for\CurrentOption:=#1\do{%
- \@xp\let\csname ds@\CurrentOption\endcsname\@False
- }%
- \let\ds@\@False
- \@xp\xdef\csname opt@\@currname.\@currext\endcsname{%
- \@xp\@xp\@xp\cull@options\csname opt@\@currname.\@currext\endcsname
-% \end{macrocode}
-% Lacking \cs{@secondofthree} and not keen on defining it \ldots
-% \begin{macrocode}
- ,\@firstoftwo\@firstoftwo,#2%
- }%
- \endgroup
-}
-% \end{macrocode}
-%
-% The usual \cs{endinput} to ensure that random garbage at the end of
-% the file doesn't get copied by \fn{docstrip}.
-% \begin{macrocode}
-\endinput
-% \end{macrocode}
-%
-% \CheckSum{112}
-% \Finale