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%D \module
%D [ file=math-scr,
%D version=2007.07.19,
%D title=\CONTEXT\ Math Macros,
%D subtitle=Scripts,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=\PRAGMA]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Math Macros / Scripts}
\unprotect
%D \macros
%D {super, sub}
%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{sub}.
\global\let\normalsuper=^
\global\let\normalsuber=_
\newcount\supersubmode
\newevery\everysupersub \EverySuperSub
\appendtoks \advance\supersubmode \plusone \to \everysupersub
\appendtoks
\gridsupsubstyle
\to \everysupersub
\appendtoks
\doifelse\@@mtsize\v!small
{\let\gridsupsubstyle \scriptscriptstyle
\let\gridsupsubbodyfont \setsmallbodyfont}%
{\let\gridsupsubstyle \scriptstyle
\let\gridsupsubbodyfont \relax}%
\to \everysetuptextformulas
\setuptextformulas
[\c!size=\v!normal]
\def\dogridsupsub#1#2%
{\begingroup
\setbox\nextbox\iftracegridsnapping\ruledhbox\else\hbox\fi
{\gridsupsubbodyfont
$\strut^{\the\everysupersub#1}_{\the\everysupersub#2}$}%
\nextboxht\strutheight
\nextboxdp\strutdepth
\flushnextbox
\endgroup}
\def\gridsupsub
{\ifconditional\crazymathsnapping
\ifgridsnapping
\@EAEAEA\dogridsupsub
\else
\@EAEAEA\normalsupsub
\fi
\else
\@EA\normalsupsub
\fi}
\def\normalsupsub#1#2%
{^{\the\everysupersub#1}_{\the\everysupersub#2}}
\appendtoks
\let\gridsupsubstyle \relax
\let\gridsupsubbodyfont\relax
\let\gridsupsub \normalsupsub
\to \everydisplay
\def\super#1{^{\the\everysupersub#1}}
\def\suber#1{_{\the\everysupersub#1}}
\def\supsub#1#2{\super{#1}\suber{#2}}
\def\subsup#1#2{\suber{#1}\super{#2}}
%\def\super#1{\gridsupsub{#1}{}} %
%\def\suber#1{\gridsupsub{}{#1}} %
%
%\def\supsub#1#2{\gridsupsub{#1}{#2}}
%\def\subsup#1#2{\gridsupsub{#2}{#1}}
\def\gridsuper#1{\gridsupsub{#1}{}}
\def\gridsuber#1{\gridsupsub{}{#1}}
% \let\sup\super % math char
% \let\sub\suber
% test set:
%
% \startbuffer
% \sform{x\frac{1}{2}}
% \sform{x\sup{\frac{1}{2}} + x\sup{2} + 2}
% \sform{x\supsub{\frac{1}{2}}{\frac{1}{2}} + x\sup{2} + 2}
% \stopbuffer
%
% \typebuffer
%
% \startlines
% \getbuffer
% \stoplines
%
% \startbuffer
% $x\frac{1}{2}$
% $x\sup{\frac{1}{2}} + x^2 + 2$
% $x\supsub{\frac{1}{2}}{\frac{1}{2}} + x^2 + 2$
% \stopbuffer
%
% \typebuffer
%
% \start
% \enablesupersub
% \enableautomath
% \startlines
% \getbuffer
% \stoplines
% \stop
%D \macros
%D {enablesupersub,enablesimplesupersub}
%D
%D We can let \type {^} and \type {_} act like \type {\super}
%D and \type {\sub} by saying \type {\enablesupersub}.
\bgroup
\catcode`\^=\@@active
\catcode`\_=\@@active
\gdef\enablesupersub
{\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\supersubmode
\textstyle
\or
\scriptstyle
\else
\scriptscriptstyle
\fi
\fi}
%D These macros were first needed by Frits Spijker (also
%D known as Gajes) for typesetting the minus sign that is
%D keyed into scientific calculators.
% This is the first alternative, which works okay for the
% minus, but less for the plus.
%
% \def\dodoraisedmathord#1#2#3%
% {\mathord{{#2\raise.#1ex\hbox{#2#3}}}}
%
% \def\doraisedmathord#1%
% {\mathchoice
% {\dodoraisedmathord5\tf #1}%
% {\dodoraisedmathord5\tf #1}%
% {\dodoraisedmathord4\tfx #1}%
% {\dodoraisedmathord3\tfxx#1}}
%
% \def\negative{\doraisedmathord-}
% \def\positive{\doraisedmathord+}
%
% So, now we use the monospaced signs, that we also
% define as symbol, so that they can be overloaded.
\def\dodoraisedmathord#1#2#3%
{\mathord{{#2\raise.#1ex\hbox{#2\symbol[#3]}}}}
\def\doraisedmathord#1%
{\mathchoice
{\dodoraisedmathord5\tf {#1}}%
{\dodoraisedmathord5\tf {#1}}%
{\dodoraisedmathord4\tx {#1}}%
{\dodoraisedmathord3\txx{#1}}}
\def\dodonumbermathord#1#2%
{\setbox\scratchbox\hbox{0}%
\mathord{\hbox to \wd\scratchbox{\hss#1\symbol[#2]\hss}}}
\def\donumbermathord#1%
{\mathchoice
{\dodonumbermathord\tf {#1}}%
{\dodonumbermathord\tf {#1}}%
{\dodonumbermathord\tx {#1}}%
{\dodonumbermathord\txx{#1}}}
\definesymbol[positive] [\getglyph{Mono}{+}]
\definesymbol[negative] [\getglyph{Mono}{-}]
\definesymbol[zeroamount][\getglyph{Mono}{-}]
\def\negative {\doraisedmathord{negative}}
\def\positive {\doraisedmathord{positive}}
\def\zeroamount{\donumbermathord{zeroamount}}
%D How negative such a symbol looks is demonstrated in:
%D $\negative 10^{\negative 10^{\negative 10}}$.
\protect \endinput
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