%% BEGIN semlayer.sty
%%
%% This is file `semlayer.sty', generated
%% on <1993/4/2> with the docstrip utility (2.0r).
%%
%% The original source files were:
%%
%% semlayer.doc
%%
\def\fileversion{1.0}
\def\filedate{93/04/01}
%%
%% LaTeX style option `semlayer.sty'.
%% For use with LaTeX v2.09 and the `seminar' document style.
%%
%% COPYRIGHT 1993, by Timothy Van Zandt, tvz@Princeton.EDU
%% See seminar.sty or seminar.doc for copying restrictions.
%%
\addto@hook\before@newslide{%
  \global\def\overlay@list{}%
  \setcounter{overlay}{0}}
\newbox\@@slidebox
\def\process@@slide{%
  \ifx\overlay@list\@empty
    \finish@slide
    \output@slide
  \else
    \setbox\@@slidebox\box\@slidebox
    \make@overlay{0}%
    \finish@slide
    \output@slide
    {\let\theoverlay\theslide\layer@loop{0}}%
    \overlay@loop
  \fi}
\def\overlay@loop{%
  \begingroup
    \overlay@prep
    \c@overlay=1
    \@whilenum\c@overlay<10
      \do{%
        \test@member{\the\c@overlay}{\overlay@list}%
        \if@test
          \make@overlay{\the\c@overlay}%
          \finish@slide
          \output@slide
        \fi
        \layer@loop{\the\c@overlay}%
        \advance\c@overlay by 1}%
  \endgroup}
\def\layer@loop#1{%
  \begingroup
    \layer@prep
    \@for\currlayer:=\layer@list\do{%
    \test@member{#1-\currlayer}{\overlay@list}%
      \if@test
        \make@overlay{#1-\currlayer}%
        \finish@slide
        \output@slide
      \fi}%
  \endgroup}
\def\layer@prep{%
  \ifarticle\pagestyle{\layer@pagestyle}\fi
  \let\thepage\thelayer
  \ifx\thelayerframe\@empty\else\let\theslideframe\thelayerframe\fi
  \let\slidelabel\layerlabel}
\def\overlay@prep{%
  \ifarticle\pagestyle{\overlay@pagestyle}\fi
  \let\thepage\theoverlay
  \ifx\theoverlayframe\@empty\else\let\theslideframe\theoverlayframe\fi
  \let\slidelabel\overlaylabel}
\def\layerframe{\@slideframe{layer}}
\def\overlayframe{\@slideframe{overlay}}
\def\thelayerframe{}
\def\theoverlayframe{}
\def\overlaylabel{\bf Overlay \theoverlay}
\def\layerlabel{\bf Layer \thelayer}
\newcounter{overlay}
\def\theoverlay{\theslide-\alph{overlay}}
\def\currlayer{}
\def\thelayer{\theoverlay-\currlayer}
\newif\ifoverlays
\newif\iflayers
\@ifundefined{@overlay}%
  {\let\@overlay\relax}%
  {\ifarticle\else\overlaystrue\layerstrue\fi}
\def\nooverlays@err{%
  \@seminarerr{You need to use additional macros for overlays,
    e.g., semcolor.sty}\@ehd
  \global\overlaysfalse
  \global\layersfalse}
\@ifundefined{@overlay}{}{}
\def\overlay#1{%
  \ifoverlays\ifx\@overlay\relax\nooverlays@err\fi\fi
  \ifslide
    \@tempcnta=#1
    \@testfalse
    \ifnum\@tempcnta>-1 \ifnum\@tempcnta<10 \@testtrue\fi\fi
    \if@test
      \c@overlay=\@tempcnta
      \ifnum\c@overlay=0
        \advance\c@slide by -1
        \refstepcounter{slide}%
      \else
        \advance\c@overlay by -1
        \refstepcounter{overlay}%
        \ifoverlays
          \xdef\overlay@list{\overlay@list,\the\c@overlay}%
        \fi
      \fi
      \ifoverlays
        \@overlay{\the\c@overlay}%
      \fi
    \else
      \@seminarerr{\string\overlay\space argument must be
        an integer between 0 and 9}\@eha
    \fi
  \else
    \@seminarerr{\string\overlay\space can only be used
      in slide environments}\@eha
  \fi
  \ignorespaces}
\def\colorlayers#1{%
  \edef\@tempc{#1}%
  \edef\layer@list{\layer@list,#1}%
  \def\@tempa##1{%
    \@namedef{##1}{%
      \iflayers\ifx\@overlay\relax\nooverlays@err\fi\fi
      \ifslide
        \iflayers
          \xdef\overlay@list{\overlay@list,\the\c@overlay-##1}%
          \@overlay{\the\c@overlay-##1}%
        \fi
      \else
        \@seminarerr{Color layer `##1' can only be used in
          slide environments}\@eha
      \fi}}
  \@for\@tempb:=\@tempc\do{%
    \expandafter\@tempa\expandafter{\@tempb}}}
\def\layer@list{}
\def\overlaypagestyle#1{\@ifgoodps{#1}{\edef\overlay@pagestyle{#1}}}
\def\layerpagestyle#1{\@ifgoodps{#1}{\edef\layer@pagestyle{#1}}}
\overlaypagestyle{}
\layerpagestyle{}
\endinput
%%
%% End of file `semlayer.sty'.
