% IFTHEN DOCUMENT-STYLE OPTION - released 16 June 1991
%    for LaTeX version 2.09
% Copyright (C) 1991 by Leslie Lamport

\typeout{Document Style Option 'ifthen' -- Released 16 June 1991.}

\long\def\ifthenelse#1#2#3{\setbox\@tempboxa
  \vbox{\let\protect\noexpand
        \let\or\@or \let\and\@and \let\not\@neg
        \let\(\@lparen \let\)\@rparen
        {\let\if\relax\let\ifx\relax\let\ifnum\relax\let\fi\relax
        \let\else\relax \xdef\@gtempa{#1}}\expandafter
        \@eval \ifnum \@gtempa\relax \def\@term{T}\else \def\@term{F}\fi
            \@endeval\global\let\@gtempa\@val}\if\@gtempa T#2\else#3\fi}

\def\@eval{\def\@val{F}\def\@orop{T}\def\@negate{F}}

\def\@endeval{\if\@negate T\def\@negate{F}\if\@term T\def\@term{F}\else
               \def\@term{T}\fi\fi
       \if\@orop T\if\@val F\let\@val\@term\fi
             \else \if\@val T\let\@val\@term\fi\fi}

\def\@or{\relax\def\noexpand\@term{T}\else \def\noexpand\@term{F}\fi
         \noexpand\@endeval \def\noexpand\@orop{T}\ifnum}

\def\@and{\relax\def\noexpand\@term{T}\else \def\noexpand\@term{F}\fi
          \noexpand\@endeval\def\noexpand\@orop{F}\ifnum}

\def\@neg{1=1 \fi \def\noexpand\@negate{T}\ifnum}

\def\@lparen{1=1 \fi \begingroup \noexpand\@eval \ifnum}

\def\@rparen{\relax\def\noexpand\@term{T}\else \def\noexpand\@term{F}\fi
             \noexpand\@endeval
             \if\noexpand\@val T\gdef\noexpand\@gtempb{1=1}\else
            \gdef\noexpand\@gtempb{1=0}\fi
            \endgroup \ifnum\noexpand\@gtempb}

\def\equal#1#2{1=1 \fi \edef\noexpand\@tempa{#1}%
               \edef\noexpand\@tempe{#2}\ifx
                \noexpand\@tempa\noexpand\@tempe
                \def\noexpand\@tempa{1=1}\else
                \def\noexpand\@tempa{1=0}\fi \ifnum \noexpand\@tempa}

\long\def\whiledo#1#2{\ifthenelse{#1}{\@whiledotrue \@whilesw\if@whiledo
              \fi{#2\ifthenelse{#1}{\@whiledotrue}{\@whiledofalse}}}{}}

\newif\if@whiledo

\endinput