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+%D \module
+%D [ file=supp-mat,
+%D version=1998.09.10,
+%D title=\CONTEXT\ Support Macros,
+%D subtitle=Math,
+%D author=Hans Hagen,
+%D date=\currentdate,
+%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+%D For practical reasons, I decided to move some math things to
+%D a support module. There is nothing spectacular here.
+
+\writestatus{loading}{Context Support Macros / Math}
+
+\unprotect
+
+%D \macros
+%D {mathematics, math, nomathematics, startmathmode}
+%D
+%D The \type{$} can be both an begin and end math character.
+%D This can lead to confusing and errorprone situations when
+%D macros insert \type{$}. When for instance we have defined:
+%D
+%D \starttyping
+%D \def\MyPlus{$\,+\,$}
+%D \stoptyping
+%D
+%D the sequence \type{$x^2 \MyPlus y^2 = r^2$} will expand to:
+%D
+%D \starttyping
+%D $x^2 $\,+\,$ y^2 = r^2$
+%D \stoptyping
+%D
+%D Here the \type{\,} are given outside math mode and \TEX\ will
+%D definitely complain about this. A more save definition would
+%D have been:
+%D
+%D \starttyping
+%D \def\MyPlus{\mathematics{\,+\,}}
+%D \stoptyping
+%D
+%D Which is implemented as:
+
+\def\mathematics#1{\relax\ifmmode#1\else$#1$\fi} % lookahead bug reported by brooks
+
+\def\startmathmode
+ {\ifmmode
+ \let\stopmathmode\relax
+ \else
+ $\def\stopmathmode{$}% \let\stopmathmode=$
+ \fi}
+
+\def\nomathematics#1%
+ {\ifmmode\hbox{#1}\else#1\fi}
+
+\let\math\mathematics
+
+%D \macros
+%D {dimension, nodimension}
+%D
+%D The next few macros are used for typesetting dimensions in
+%D such a way that spacing is acceptable. I won't spend much
+%D words on these macros, because they will be overloaded in
+%D the units module.
+
+\newsignal\dimensionsignal
+
+\def\dimensiontypeface {\tf}
+\def\dimensionhalfspace {\,}
+
+\unexpanded\def\dimension#1%
+ {\def\dodimensionsignal{\kern\dimensionsignal}%
+ \ifdim\lastskip=\zeropoint\relax
+ \ifdim\lastkern=\zeropoint\relax
+ \ifmmode
+ \mathematics{\dimensionhalfspace\dimensionhalfspace\dimensiontypeface#1}%
+ \else
+ \mathematics{\dimensiontypeface#1}%
+ \fi
+ \else\ifdim\lastkern=\dimensionsignal
+ \mathematics{\dimensionhalfspace\dimensiontypeface#1}%
+ \else
+ \unkern\mathematics{\dimensionhalfspace\dimensionhalfspace\dimensiontypeface#1}%
+ \fi\fi
+ \else
+ \unskip\mathematics{\dimensionhalfspace\dimensionhalfspace\dimensiontypeface#1}%
+ \fi
+ \dodimensionsignal}
+
+\unexpanded\def\nodimension#1%
+ {\unskip#1\global\let\dodimensionsignal\relax}
+
+%D \macros
+%D {super, suber}
+%D
+%D \TEX\ uses \type{^} and \type{_} for entering super- and
+%D subscript mode. We want however a bit more control than
+%D normally provided, and therefore provide \type {\super}
+%D and \type{\suber} (\type {\sub} is already taken).
+
+\global\let\normalsuper=^
+\global\let\normalsuber=_
+
+\newcount\supersubmode
+
+\newevery\everysupersub \EverySuperSub
+
+\appendtoks \advance\supersubmode 1\relax \to \everysupersub
+
+% \def\dodosuper#1{\normalsuper{\the\everysupersub#1}}
+% \def\dodosuber#1{\normalsuber{\the\everysupersub#1}}
+%
+% \def\dosuper{\ifx\next\bgroup\expandafter\dodosuper\else\normalsuper\fi}
+% \def\dosuber{\ifx\next\bgroup\expandafter\dodosuber\else\normalsuber\fi}
+%
+% \def\super{\futurelet\next\dosuper}
+% \def\suber{\futurelet\next\dosuber}
+
+\def\super#1{\normalsuper{\the\everysupersub#1}}
+\def\suber#1{\normalsuber{\the\everysupersub#1}}
+
+%D \macros
+%D {enablesupsub}
+%D
+%D We can let \type {^} and \type {_} act like \type {\super}
+%D and \type {\suber} by saying \type {\enablesupsub}.
+
+\bgroup
+\catcode`\^=\@@active
+\catcode`\_=\@@active
+\gdef\enablesupsub
+ {\catcode`\^=\@@active
+ \def^{\ifmmode\expandafter\super\else\expandafter\normalsuper\fi}%
+ \catcode`\_=\@@active
+ \def_{\ifmmode\expandafter\suber\else\expandafter\normalsuber\fi}}
+\egroup
+
+%D \macros
+%D {restoremathstyle}
+%D
+%D We can pick up the current math style by calling \type
+%D {\restoremathstyle}.
+
+\def\restoremathstyle
+ {\ifmmode
+ \ifcase\supsubmode
+ \textstyle
+ \or
+ \scriptstyle
+ \else
+ \scriptscriptstyle
+ \fi
+ \fi}
+
+\protect \endinput