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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 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.
\writestatus{loading}{ConTeXt Math Macros / Scripts}
\unprotect
%D These macros were first needed by Frits (Gajes) Spijker
%D (of the Math4All project that we participate in), and used
%D for typesetting the minus sign that is keyed into scientific
%D calculators. We use the monospaced signs, that we also define
%D as symbol, so that they can be overloaded.
\def\math_scripts_raised_symbol#1%
{\mathchoice
{\math_scripts_raised_symbol_indeed5\tf {#1}}%
{\math_scripts_raised_symbol_indeed5\tf {#1}}%
{\math_scripts_raised_symbol_indeed4\tx {#1}}%
{\math_scripts_raised_symbol_indeed3\txx{#1}}}
\def\math_scripts_raised_symbol_indeed#1#2#3%
{\mathord{{#2\raise.#1ex\hbox{#2\symbol[#3]}}}}
\def\math_scripts_raised_number#1%
{\mathchoice
{\math_scripts_raised_number_indeed\tf {#1}}%
{\math_scripts_raised_number_indeed\tf {#1}}%
{\math_scripts_raised_number_indeed\tx {#1}}%
{\math_scripts_raised_number_indeed\txx{#1}}}
\def\math_scripts_raised_number_indeed#1#2%
{\setbox\scratchbox\hbox{0}%
\mathord{\hbox to \wd\scratchbox{\hss#1\symbol[#2]\hss}}}
\definesymbol[positive] [\getglyph{Mono}{+}]
\definesymbol[negative] [\getglyph{Mono}{-}]
\definesymbol[zeroamount][\getglyph{Mono}{-}]
\unexpanded\def\negative {\math_scripts_raised_symbol{negative}}
\unexpanded\def\positive {\math_scripts_raised_symbol{positive}}
\unexpanded\def\zeroamount{\math_scripts_raised_number{zeroamount}}
%D How negative such a symbol looks is demonstrated in:
%D $\negative 10^{\negative 10^{\negative 10}}$.
% \setuptextformulas % why here
% [\c!size=\v!normal]
\protect \endinput
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