\ProvidesPackageRCS $Header: /cvsroot/latex-beamer/latex-beamer/base/beamerbasemodes.sty,v 1.20 2004/10/07 20:17:57 tantau Exp $

% Copyright 2003 by Till Tantau <tantau@users.sourceforge.net>.
%
% This program can be redistributed and/or modified under the terms
% of the GNU Public License, version 2.


%
% Global Declarations used by beamer in all modes
%
\newbox\beamer@tempbox
\newif\ifbeamer@blocks
\newif\ifbeamer@ams
\newif\ifbeamer@countsect
\beamer@blockstrue
\beamer@amstrue
\beamer@countsectfalse
\newcount\beamer@tempcount
\newcounter{beamerpauses}


\RequirePackage{beamerbasedecode}

%
% Presentation/article stuff
%
% Copyright notice: Part of the following code is taken from the
% package comment.sty by Victor Eijkhout
%


%
% Versioning stuff
%
\def\beamer@endinputifotherversion#1{%
  \let\beamer@next=\relax%
  \@tempdima=\beamer@version pt\relax%
  \ifdim\@tempdima<#1%
    \let\beamer@next=\endinput%
  \else%
    \ifdim\@tempdima>#1%
      \let\beamer@next=\endinput%
    \fi%
  \fi%
  \beamer@next}

%
% Comment stuff. This will also be needed, if we switch to another
% class, so define it here already.
%
\newif\ifbeamer@inpresentation
\beamer@inpresentationtrue

\def\beamer@makeinnocent#1{\catcode`#1=12 }
\def\beamer@startcomment{%
    \begingroup%
    \let\do\beamer@makeinnocent\dospecials%
    \beamer@makeinnocent\^^L% and whatever other special cases
    \endlinechar`\^^M \catcode`\^^M=12 \beamer@processline}

{\catcode`\^^M=12\endlinechar=-1%
  \long\gdef\beamer@processline#1^^M{%
    \def\beamer@test{#1}%
    \ifx\beamer@test\beamer@stopmodestar%
      \let\next=\beamer@modeoutsideframe%
    \else%
    \ifx\beamer@test\beamer@stopmode%
      \let\next=\mode%
    \else%
      \ifx\beamer@test\beamer@stoparticle%
        \let\next=\article%
      \else%
        \ifx\beamer@test\beamer@stoppresentation%
          \let\next=\presentation%
        \else%
          \ifx\beamer@test\beamer@stopcommon%
            \let\next=\common%
          \else%
            \ifx\beamer@test\beamer@stopdocument%
              \let\next=\beamer@enddocument%
            \else
              \ifx\beamer@test\beamer@begindocument%
                \let\next=\beamer@startdocument%
              \else
                \let\next=\beamer@processline%
              \fi%  
            \fi%  
          \fi%
        \fi%
      \fi%
    \fi%
    \fi%
    \next}
}

\def\beamer@enddocument{\beamer@closer\end{document}}
\def\beamer@startdocument{\beamer@closer\begin{document}\def\beamer@closer{}\common}
\def\beamer@closer{}
{\escapechar=-1\relax%
  \xdef\beamer@stopmode{\string\\mode}
  \xdef\beamer@stopmodestar{\string\\mode*}
  \xdef\beamer@stoparticle{\string\\article}
  \xdef\beamer@stoppresentation{\string\\presentation}
  \xdef\beamer@stopcommon{\string\\common}
  \xdef\beamer@stopdocument{\string\\end\string\{document\string\}}
  \xdef\beamer@begindocument{\string\\begin\string\{document\string\}}
}
\newbox\beamer@commentbox
\def\beamer@startcommentinframe{%
  \begingroup%
  \edef\beamer@closer{\egroup\beamer@closer}%
  \setbox\beamer@commentbox=\vbox\bgroup\leavevmode}

\def\beamer@outsidemode{\afterassignment\beamer@treat\let\beamer@nexttoken=}
\def\beamer@treat{%
  \ifx\beamer@nexttoken\frame\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\lecture\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\note\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\appendix\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\againframe\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\section\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\subsection\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\part\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\article\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\mode\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\common\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\presentation\let\next=\beamer@stopoutsidemode\fi%
  \ifx\beamer@nexttoken\begin\let\next=\beamer@checkbeginframe\fi%
  \ifx\beamer@nexttoken\end\let\next=\beamer@checkenddoc\fi%
  \next}

\def\beamer@stopoutsidemode{\beamer@nexttoken}
\def\beamer@checkenddoc#1{%
  \def\beamer@temp{#1}%
  \ifx\beamer@temp\beamer@enddoc%
    \let\next=\beamer@enddocument%
  \else%
    \let\next=\beamer@outsidemode%
  \fi%
  \next}
\def\beamer@enddoc{document}

\def\beamer@checkbeginframe#1{%
  \def\beamer@temp{#1}%
  \ifx\beamer@temp\beamer@frametext%
    \let\next=\beamer@beginframeenv%
  \else%
    \let\next=\beamer@outsidemode%
  \fi%
  \next}
\def\beamer@beginframeenv{\begin{frame}}

\def\beamer@modeoutsideframe{%
  \beamer@closer%
  \gdef\beamer@mode{\beamer@modeoutsideframe}%
  \ifbeamer@inpresentation%
    \let\next=\beamer@outsidemode%
    \gdef\beamer@closer{}%
  \else%
    \let\next=\relax%
    \gdef\beamer@closer{}%
  \fi%
  \next}


%obsolete, do note use:
\def\presentation{\mode<presentation>}
\def\article{\mode<article>}
\def\common{\mode<all>}

%
% Mode command
%
\def\mode{\@ifstar\beamer@modeoutsideframe\beamer@@@mode}
\def\beamer@@@mode<#1>{\beamer@closer\@ifnextchar\bgroup{\beamer@modeinline<#1>}{\beamer@switchmode<#1>}}
\long\def\beamer@modeinline<#1>#2{%
  \gdef\beamer@closer{}%
  \def\beamer@doifnotinframe{\@gobble}\def\beamer@doifinframe{\@firstofone}%
  {\beamer@saveanother\beamer@slideinframe=1\relax%
   \beamer@masterdecode{#1}%
   \beamer@restoreanother}\beamer@donow{#2}%
  \beamer@mode\par}
\def\beamer@switchmode<#1>{%
  \gdef\beamer@mode{\beamer@switchmode<#1>}%
  \def\beamer@doifnotinframe{%
    \let\next=\beamer@startcomment%
    \gdef\beamer@closer{\endgroup}%
  }%
  \def\beamer@doifinframe{%
    \let\next=\relax%
    \gdef\beamer@closer{}%
   }%
  {\beamer@saveanother\beamer@slideinframe=1\relax%
   \beamer@masterdecode{#1}%
   \beamer@restoreanother}\beamer@donow%
  \next}

\mode<all>

\newcount\beamer@modecount
\def\beamer@pushmode#1{%
  \expandafter\gdef\csname beamer@savedmode@\the\beamer@modecount\endcsname{#1}%
  \global\advance\beamer@modecount by1\relax}
\def\beamer@popmode{
  \global\advance\beamer@modecount by-1\relax%
  \csname beamer@savedmode@\the\beamer@modecount\endcsname}
  
\def\beamer@savemode{\expandafter\beamer@pushmode\expandafter{\beamer@mode}}
\def\beamer@resumemode{\beamer@popmode}



%
% Stuff needed in both article and presentation version
%
\def\jobnamebeamerversion{}%

\def\includeslide{\@ifnextchar[{\@includeslide}{\@includeslide[]}}
\def\@includeslide[#1]#2{%
  \ifx\jobnamebeamerversion\@empty%
  \ClassError{beamer}{Invoke macro "setjobnamebeamerversion" first}{}%
  \else%
  \edef\beamer@args{[#1,page=\csname beamer@slide#2\endcsname]{\jobnamebeamerversion}}
  \expandafter\pgfimage\beamer@args%
  \fi}

\def\setjobnamebeamerversion#1{%
  \def\jobnamebeamerversion{#1}%
  {\makeatletter
  \@input{\jobnamebeamerversion.snm}}
}



%
% Check whether we should initiate transfer to another class (obsolete)
%

% Extract class name, if present
\def\beamer@classname{}
\def\beamer@classoptions{}
\def\beamer@classnamename{class}
\def\beamer@eq{=,}
\def\beamer@findclassname#1=#2,#3!{
  \def\beamer@temp{#1}
  \ifx\beamer@temp\beamer@classnamename
    \def\beamer@classname{#2}
    \beamer@stripsign#3!
  \fi}
\def\beamer@stripsign#1!{%
  \def\beamer@temp{#1}
  \ifx\beamer@temp\beamer@eq
  % nothing to do
  \else
  \beamer@@stripsign#1!
  \fi
}
\def\beamer@@stripsign#1,=,!{
  \def\beamer@classoptions{#1}
  }

\def\beamer@transfer{%
  % Prepare...
  \def\beamer@slide##1##2{\expandafter\gdef\csname
    beamer@slide##1\endcsname{##2}}

  \beamer@inpresentationfalse

  \def\beamer@currentmode{article}

  \common
  
  \edef\beamer@classwhat{[\beamer@classoptions]{\beamer@classname}}
  \expandafter\LoadClass\beamer@classwhat
  \endinput
  }

\expandafter\beamer@findclassname\@classoptionslist,=,!
\ifx\beamer@classname\@empty
  \let\beamer@transferifnecessary=\relax
\else
  % Need to transfer to another class soon
  \let\beamer@transferifnecessary=\beamer@transfer
\fi
\endinput

%%% Local Variables: 
%%% mode: latex
%%% TeX-master: ../examples/beamerexample1.tex
%%% End: 
