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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. It may move
%D back to math-ini.
\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:
\long\def\mathematics#1{\relax\ifmmode#1\else $#1$\fi} % lookahead bug reported by brooks
\long\def\displaymath#1{\relax\ifmmode#1\else$$#1$$\fi}
\long\def\inlinemath #1{\dontleavehmode\relax\ifmmode#1\else $#1$\fi}
\let\stopmathmode\relax
\def\startmathmode % cannot be used nested
{\relax\ifmmode
\let\stopmathmode\relax
\else
$\def\stopmathmode{$}% \let\stopmathmode=$
\fi}
\def\startmathmode % nested variant
{\relax\ifmmode
\begingroup\let\stopmathmode\endgroup
\else
$\let\stopmathmode$%
\fi}
\def\nomathematics#1%
{\relax\ifmmode\hbox{#1}\else#1\fi}
\let\math\mathematics
%D \macros
%D {displaymathematics,inlinemathematics,automathematics}
%D
%D An example of usage of the following can be found in the MathML module:
\long\def\displaymathematics#1{\relax\ifmmode#1\else\dostartformula{}#1\dostopformula\fi}
\def\inlinemathematics {\dontleavehmode\mathematics}
\def\automathematics {\relax\ifhmode\@EA\inlinemathematics\else\@EA\displaymathematics\fi}
% better, esp when used in bTABLE ... eTABLE
\def\automathematics
{\relax
\ifhmode
\expandafter\inlinemathematics
\else\ifintable
\expandafter\expandafter\expandafter\inlinemathematics
\else
\expandafter\expandafter\expandafter\displaymathematics
\fi\fi}
%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}
%D \macros
%D {cramped}
%D
%D \TEX provides no primitive to force in cramped math mode. Here is
%D a macro that does so. It is based on a solution by Don Knuth (\useurl
%D {http://www.ctan.org/tex-archive/digests/tex-implementors/042}).
%D
%D \startbuffer
%D \ruledhbox{$\left\{{x^2\over y^2}\right\}$}
%D \ruledhbox{$\cramped{\left\{ {x^2\over y^2}\right\}}$}
%D \stopbuffer
%D
%D \typebuffer \getbuffer
\def\cramped
{\mathpalette\docramped}
%D We force a cramped style by issuing a non||existing radical (box).
%D After that we make sure the height is correct. (Comment taken from
%D Morten Høgholm's mathtools package.) Macro suggested by AM and
%D cleaned up a bit by HH.
% original
%
% \def\docramped#1#2%
% {\setbox\scratchbox\hbox
% {\nulldelimiterspace\zeropoint
% $\mathsurround\zeropoint#1\radical\zerocount{#2}$}%
% \ifx#1\displaystyle
% \scratchdimen\fontdimen8\textfont3
% \advance\scratchdimen .25\fontdimen5\textfont2
% \else
% \scratchdimen1.25\fontdimen8
% \ifx#1\textstyle\textfont
% \else
% \ifx#1\scriptstyle\scriptfont\else\scriptscriptfont\fi
% \fi
% 3
% \fi
% \advance\scratchdimen-\ht\scratchbox
% \ht\scratchbox-\scratchdimen
% \box\scratchbox}
\def\docramped#1#2%
{\begingroup % added HH, made even more cramped
\setbox\scratchbox\hbox
{\nulldelimiterspace\zeropoint
$\mathsurround\zeropoint#1\radical\zerocount{#2}$}%
\ht\scratchbox-\dimexpr
\ifx#1\displaystyle
\fontdimen8\textfont3
+.25\fontdimen5\textfont2
\else
1.25\fontdimen8
\ifx#1\textstyle
\textfont
\else\ifx#1\scriptstyle
\scriptfont
\else
\scriptscriptfont
\fi \fi
\plusthree
\fi
-\ht\scratchbox
\relax
\box\scratchbox
\endgroup}
%D \macros
%D {cramedllap, crampedrlap, crampedclap}
%D
%D In many cases, one wants to use the \tex {clap} macro in
%D math mode while using subscripts. Normally, subscripts are
%D in cramped mode, and these macros allow you to go to
%D cramped mode. For example:
%D
%D \startbuffer
%D \startformula
%D \sum_{a^2 < b^2 < c^2} \quad
%D \sum_{\clap{a^2 < b^2 < c^2}} \quad
%D \sum_{\crampedclap{a^2 < b^2 < c^2}}
%D \stopformula
%D \stopbuffer
%D
%D \start
%D \typebuffer
%D \switchtobodyfont[24pt]
%D \getbuffer
%D \stop
%D
%D Notice that \type {\clap{\cramped ... }} would also work,
%D but it requires \TEX\ to typeset it arguments 16 times.
\def\docrampedllap#1#2{{}\dollap{\docramped #1{#2}}}
\def\docrampedrlap#1#2{{}\dorlap{\docramped #1{#2}}}
\def\docrampedclap#1#2{{}\doclap{\docramped #1{#2}}}
\def\crampedllap{\mathpalette\docrampedllap}
\def\crampedrlap{\mathpalette\docrampedrlap}
\def\crampedclap{\mathpalette\docrampedclap}
\protect \endinput
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