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+% \iffalse meta-comment
+%
+% Copyright (C) 2008 by Ulrich M. Schwarz
+%
+% This file may be distributed and/or modified under the conditions of
+% the LaTeX Project Public License, version 1.3a.
+% The license can be obtained from
+% http://www.latex-project.org/lppl/lppl-1-3a.txt
+%
+% \fi
+%
+%\iffalse (hide this from DocInput)
+%<*driver>
+\documentclass{ltxdoc}
+
+\usepackage[T1]{fontenc}
+\usepackage{fourier}
+\usepackage[scaled=0.8]{helvet}
+\usepackage{luximono}
+
+\usepackage{amsmath, amsthm}
+\usepackage{parseargs}
+\newtheorem{lemma}{Lemma}
+\providecommand\pkg{\textsf}
+\GetFileInfo{parseargs.sty}
+\EnableCrossrefs
+\CodelineIndex
+\RecordChanges
+\begin{document}
+ \newcommand\ParseArgs{\textsf{ParseArgs}}
+ \title{The \ParseArgs\ package\thanks{%
+ This file documents version~\fileversion\ of~\filedate,
+ RCS ${}$Id: parseargs.dtx,v 1.2 2008/06/22 12:09:33 ulmi Exp ulmi ${}$.
+ }}
+ \author{Ulrich M. Schwarz\thanks{ulmi@absatzen.de}}
+
+ \maketitle
+
+ \begin{abstract}
+ A command like |\newtheorem| with its gazillion different argument
+ possibilities is difficult to parse manually. And then, you add beamer
+ support and you have to wade through a maze of twisty call indirections,
+ all alike.
+
+ This package provides a generic argument parser similar to the one that
+ will be in \LaTeX3.
+ \end{abstract}
+
+ \DocInput{thm-autoref.dtx}
+\end{document}
+%</driver>
+%<*parseargs>
+%\fi
+%
+% \CharacterTable
+% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+% Digits \0\1\2\3\4\5\6\7\8\9
+% Exclamation \! Double quote \" Hash (number) \#
+% Dollar \$ Percent \% Ampersand \&
+% Acute accent \' Left paren \( Right paren \)
+% Asterisk \* Plus \+ Comma \,
+% Minus \- Point \. Solidus \/
+% Colon \: Semicolon \; Less than \<
+% Equals \= Greater than \> Question mark \?
+% Commercial at \@ Left bracket \[ Backslash \\
+% Right bracket \] Circumflex \^ Underscore \_
+% Grave accent \` Left brace \{ Vertical bar \|
+% Right brace \} Tilde \~}
+% \CheckSum{160}
+%
+% \DoNotIndex{\@for,\addtocounter,\arabic,\csname,\endcsname,\cup,\CurrentOption}
+% \DoNotIndex{\{,\},\do,\define@key,\def,\DeclareOption,\else,\ensuremath,\expandafter}
+% \DoNotIndex{\hspace,\fi,\rule,\ifcase,\ifx,\in,\InputIfFileExists,\leq,\let,\mathpalette}
+% \DoNotIndex{\NeedsTeXFormat,\ldots,\ldotp,\newcommand,\newcounter,\or}
+% \DoNotIndex{\PackageInfo,\PackageWarning,\parm,\ProcessOptions,\protected@edef}
+% \DoNotIndex{\providecommand,\ProvidesPackage,\relax,\renewcommand,\RequirePackage}
+% \DoNotIndex{\setcounter,\setkeys,\rlap,\setminus,\widthof,\mathrm}
+%
+%\section{Usage}
+%
+% The main command provided by the package is |\parse|\marg{spec}.
+% \emph{spec} consists of groups of commands. Each group should set up the
+% command |\@parsecmd| which is then run. The important point is that
+% |\@parsecmd| will pick up its arguments from the running text, not from
+% the rest of \emph{spec}. When it's done storing the arguments,
+% |\@parsecmd| must call |\@parse| to continue with the next element of
+% \emph{spec}. The process terminates when we run out of spec.
+%
+% Helper macros are provided for the three usual argument types: mandatory,
+% optional, and flag.
+%
+%\StopEventually{}
+%\section{Implementation}
+% \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{parseargs}[2008/05/12 v0.1alpha1 generic argument parser (ulmi)]
+
+\newtoks\@parsespec
+\def\parse@endquark{\parse@endquark}
+\newcommand\parse[1]{%
+ \@parsespec{#1\parse@endquark}\@parse}
+
+\newcommand\@parse{%
+ \edef\p@tmp{\the\@parsespec}%
+ \ifx\p@tmp\parse@endquark
+ \expandafter\@gobble
+ \else
+% \typeout{parsespec remaining: \the\@parsespec}%
+ \expandafter\@firstofone
+ \fi{%
+ \@parsepop
+ }%
+}
+\def\@parsepop{%
+ \expandafter\p@rsepop\the\@parsespec\@nil
+ \@parsecmd
+}
+\def\p@rsepop#1#2\@nil{%
+ #1%
+ \@parsespec{#2}%
+}
+
+\newcommand\parseOpt[4]{%
+ %\parseOpt{openchar}{closechar}{yes}{no}
+% \typeout{attemping #1#2...}%
+ \def\@parsecmd{%
+ \@ifnextchar#1{\@@reallyparse}{#4\@parse}
+ }%
+ \def\@@reallyparse#1##1#2{%
+ #3\@parse
+ }%
+}
+
+\newcommand\parseMand[1]{%
+ %\parseMand{code}
+ \def\@parsecmd##1{#1\@parse}%
+}
+
+\newcommand\parseFlag[3]{%
+ %\parseFlag{flagchar}{yes}{no}
+ \def\@parsecmd{%
+ \@ifnextchar#1{#2\expandafter\@parse\@gobble}{#3\@parse}%
+ }%
+}
+% \end{macrocode}
+%\iffalse
+%</parseargs>
+%\fi