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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 ADE \& \CONTEXT\ Development Team}]
%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 a support module.
%D There is nothing spectacular here. It may move back to math-ini.
\writestatus{loading}{ConTeXt Support Macros / Math}
\unprotect
%D \macros
%D {mathematics, math, nomathematics, startmathmode}
%D
%D The \type {$} can be both an begin and end math character. This can lead to
%D confusing and errorprone situations when macros insert \type {$}. When for
%D 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 definitely
%D complain about this. A more save definition would have been:
%D
%D \starttyping
%D \def\MyPlus{\mathematics{\,+\,}}
%D \stoptyping
%D
%D Which is implemented (in \type{syst-ini.mkiv}) as:
% \permanent\protected\def\Ucheckedstartdisplaymath
% {\ifinner
% \ifhmode
% \normalUstartmath
% \let\Ucheckedstopdisplaymath\normalUstopmath
% \else
% \normalUstartdisplaymath
% \let\Ucheckedstopdisplaymath\normalUstopdisplaymath
% \fi
% \else
% \normalUstartdisplaymath
% \let\Ucheckedstopdisplaymath\normalUstopdisplaymath
% \fi}
%
% \aliased\let\Ucheckedstopdisplaymath\relax
% \let\normalsuper\Usuperscript % obsolete
% \let\normalsuber\Usubscript % obsolete
\aliased\let\startimath\Ustartmath
\aliased\let\stopimath \Ustopmath
\aliased\let\startdmath\Ustartdisplaymath % \Ucheckedstartdisplaymath
\aliased\let\stopdmath \Ustopdisplaymath % \Ucheckedstopdisplaymath
\permanent\protected\def\mathematics#1{\relax \ifmmode#1\else\normalstartimath#1\normalstopimath\fi}
%permanent\protected\def\displaymath#1{\noindent \ifmmode#1\else\normalstartdmath#1\normalstopdmath\fi}
%permanent\protected\def\inlinemath #1{\dontleavehmode\ifmmode#1\else\normalstartimath#1\normalstopimath\fi}
\permanent\protected\def\textmath #1{\dontleavehmode\ifmmode#1\else\begingroup\everymath\emptytoks\normalstartimath#1\normalstopimath\endgroup\fi} % \mathsurround\zeropoint
\aliased\let\stopmathmode\relax
\permanent\protected\def\startmathmode % nested variant
{\relax\ifmmode
\begingroup
\enforced\let\stopmathmode\endgroup
\else
\normalstartimath
\enforced\let\stopmathmode\normalstopimath
\fi}
\permanent\protected\def\nomathematics#1%
{\relax\ifmmode\hbox{#1}\else#1\fi}
\aliased\let\m \mathematics % \mathematics will be overloaded later
\aliased\let\math\mathematics % \mathematics will be overloaded later
%D \macros
%D {displaymathematics,inlinemathematics,automathematics}
%D
%D We no longer support native displaymath, which is no big deal because already
%D for many years we abandoned it. We therefore also default differently now. We
%D signal \LUAMETATEX\ that the double dollar mode actually has to be inline
%D display math anyway.
\ifdefined\strc_formulas_start_formula \else
\def\strc_formulas_start_formula{\normalstartdmath}
\def\strc_formulas_stop_formula {\normalstopdmath }
\fi
\permanent\protected\def\displaymathematics#1{\relax\ifmmode#1\else\strc_formulas_start_formula{}#1\strc_formulas_stop_formula\fi}
\permanent\protected\def\inlinemathematics {\dontleavehmode\mathematics}
%permanent\protected\def\automathematics {\relax\ifhmode\expandafter\inlinemathematics\else\expandafter\displaymathematics\fi}
\aliased\let\displaymath\displaymathematics % we no longer support native displaymath
\aliased\let\inlinemath \inlinemathematics % we no longer support native displaymath
% better, esp when used in bTABLE ... eTABLE
\permanent\protected\def\automathematics
{\relax
\ifhmode
\expandafter\inlinemathematics
\orelse\ifintable
\expandafter\inlinemathematics
\else
\expandafter\displaymathematics
\fi}
%D \macros
%D {dimension, nodimension}
%D
%D The next few macros are used for typesetting dimensions in such a way that
%D spacing is acceptable. I won't spend much words on these macros, because they
%D will be overloaded in the units module.
%D
%D REPLACED (keep commented):
% \newsignal\dimensionsignal
%
% \mutable\def\dimensiontypeface {\tf}
% \mutable\def\dimensionhalfspace {\,}
%
% \aliased\let\dodimensionsignal\relax
%
% \permanent\protected\def\dimension#1%
% {\pushmacro\dodimensionsignal
% \enforced\gdef\dodimensionsignal{\kern\dimensionsignal}%
% \ifzeropt\lastskip
% \ifzeropt\lastkern
% \ifmmode
% \mathematics{\dimensionhalfspace\dimensionhalfspace\dimensiontypeface#1}%
% \else
% \mathematics{\dimensiontypeface#1}%
% \fi
% \orelse\ifdim\lastkern=\dimensionsignal
% \mathematics{\dimensionhalfspace\dimensiontypeface#1}%
% \else
% \unkern\mathematics{\dimensionhalfspace\dimensionhalfspace\dimensiontypeface#1}%
% \fi
% \else
% \unskip\mathematics{\dimensionhalfspace\dimensionhalfspace\dimensiontypeface#1}%
% \fi
% \dodimensionsignal
% \popmacro\dodimensionsignal}
%
% \permanent\protected\def\nodimension#1%
% {\unskip#1\enforced\glet\dodimensionsignal\relax}
% experiment, not yet to be used
% \protected\def\displaybreak
% {\ifhmode
% \removeunwantedspaces
% \ifcase\raggedstatus\hfill\fi
% \strut\penalty-9999 % \break fails on case (3)
% \fi}
%
% \def\startdisplay{\displaybreak\ignorespaces\startpacked}
% \def\stopdisplay {\stoppacked\displaybreak\ignorespaces}
\aliased\let\superscript \Usuperscript
\aliased\let\subscript \Usubscript
\aliased\let\primescript \Uprimescript
\aliased\let\nosuperscript \Unosuperscript
\aliased\let\nosubscript \Unosubscript
\aliased\let\superprescript \Usuperprescript
\aliased\let\subprescript \Usubprescript
\aliased\let\nosuperprescript\Unosuperprescript
\aliased\let\nosubsprecript \Unosubprescript
\protect \endinput
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