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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{thm-restate}
\newtheorem{lemma}{Lemma}
\GetFileInfo{thm-restate.sty}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
\begin{document}
  \DocInput{thm-restate.dtx}
\end{document}
%</driver>
%<*restate>
%\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}
%
% \newcommand\thmrestate{\textsf{thm-restate}}
% \title{The \thmrestate\ package\thanks{%
%   This file documents version~\fileversion\ of~\filedate,
%   RCS ${}$Id: thm-restate.dtx,v 1.8 2008/02/17 21:08:04 ulmi Exp ulmi ${}$.
% }}
% \author{Ulrich M. Schwarz\thanks{ulmi@absatzen.de}}
%
% \maketitle
%
%\begin{abstract}
%  This package provides one single environment, restatable, which lets you
%  repeat whole theorems without retyping them.
%\end{abstract}
%\section{Usage}
%\DescribeEnv{restatable}
%Only one environment is provided: \verb|restatable|, which takes one
%optional and two mandatory arguments. The first mandatory argument is the
%type of the theorem, i.e. if you want \verb|\begin{lemma}| to be called on
%the inside, give \verb|lemma|. The second argument is the name of the macro
%that the text should be stored in, for example \verb|mylemma|. Be careful
%not to specify existing command names! The optional argument will become the
%optional argument to your theorem command. Consider the following example:
%\begin{verbatim}
%  \documentclass{article}
%  \usepackage{amsmath, amsthm, thm-restate}
%  \newtheorem{lemma}{Lemma}
%  \begin{document}
%    \begin{restatable}[Zorn]{lemma}{zornlemma}\label{thm:zorn}
%      If every chain in $X$ is upper-bounded, 
%      $X$ has a maximal element.
%
%      It's true, you know!
%    \end{restatable}
%    \begin{lemma}
%      This is some other lemma of no import.
%    \end{lemma}
%    And now, here's Mr. Zorn again: \zornlemma
%  \end{document}
%\end{verbatim}
%which yields
%    \begin{restatable}[Zorn]{lemma}{zornlemma}\label{thm:zorn}
%      If every chain in $X$ is upper-bounded, $X$ has a maximal element.
%
%      It's true, you know!
%    \end{restatable}
%    \begin{lemma}
%      This is some other lemma of no import.
%    \end{lemma}
%    Actually, we have set a label in the environment, so we know that
%    it's Lemma~\ref{thm:zorn} on page~\ref{thm:zorn}.
%    And now, here's Mr. Zorn again: \zornlemma
%    Since we prevent the label from being set again, we find that
%    it's still Lemma~\ref{thm:zorn} on page~\ref{thm:zorn}, even though
%    it occurs later also. Maybe at some point, there'll be a way to control
%    which instance gets its labels executed.
%
% \subsection{Restrictions}
% The only counter that is saved is the one for the theorem number. So,
% putting floats inside a restatable is not advised. You cannot nest
% restatables either. The first occurrence is the priviledged one that 
% determines the number and the label/page info, you cannot change that
% at the moment. hyperref will get confused, too, so currently, links
% won't work.
%
%\section{Implementation}
%    \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{thm-restate}[2008/02/17 BETA thm-restate (ulmi)]

\let\@xa\expandafter
\let\@nx\noexpand
\@ifundefined{c@thmt@dummyctr}{%
  \newcounter{thmt@dummyctr}%
  }{}
\gdef\theHthmt@dummyctr{dummy.\arabic{thmt@dummyctr}}%

\newtoks\thmt@toks
\long\def\thmt@collect@body#1#2\end#3{%
  \@xa\thmt@toks\@xa{\the\thmt@toks #2}%
  \def\thmttmpa{#3}\def\thmttmpb{restatable}%
  \ifx\thmttmpa\thmttmpb
    \@xa\@firstoftwo% this is the end of the environment.
  \else
    \@xa\@secondoftwo% go on collecting
  \fi{%
    \@xa#1\@xa{\the\thmt@toks}%
  }{%
    \@xa\thmt@toks\@xa{\the\thmt@toks\end{#3}}%
    \thmt@collect@body{#1}%
  }%
}

\newenvironment{restatable}[3][]{%
  \def\thmrst@type{#2}%
  \long\def\thmrst@store##1{%
    \protected@edef\thmrst@nmbr{\csname the#2\endcsname}%
    \@xa\long\@xa\gdef\csname #3\@xa\endcsname\@xa{%
    \@xa\begingroup
    \@xa\def\csname the#2\@xa\endcsname\@xa{\thmrst@nmbr}%
    \@xa\let\csname c@#2\endcsname\c@thmt@dummyctr
    \@xa\let\csname theH#2\endcsname\theHthmt@dummyctr
    \let\label=\@gobble
    %\def\@currenvir{#2}%
    \csname #2\@xa\endcsname\ifx\@nx#1\@nx\else[#1]\fi
    ##1
    \csname end#2\endcsname
    \endgroup
  }##1\end{restatable}}%
  %\def\@currenvir{#2}%
  \csname #2\@xa\endcsname\ifx\@nx#1\@nx\else[#1]\fi
  \thmt@collect@body\thmrst@store
}{%
  \csname end\thmrst@type\endcsname
  %\def\@currenvir{restatable}%
}
%    \end{macrocode}
%\iffalse
%</restate>
%\fi