%D \module
%D   [       file=math-toy,
%D        version=2020.08.31,
%D          title=\CONTEXT\ Math Macros,
%D       subtitle=Toy 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.

\writestatus{loading}{ConTeXt Math Macros / Toy}

\unprotect

%D Just an example:
%D
%D \starttyping
%D \enabletrackers[math.toysymbol]
%D
%D \definemathtoysymbol[Plus] [binary]  [+]
%D \definemathtoysymbol[Minus][binary]  [-]
%D \definemathtoysymbol[Equal][relation][=]
%D
%D $\dorecurse{199}{x_{#1} \ifodd#1\relax\Plus\else\Minus\fi} x_{200} \Equal n$ \blank
%D \stoptyping

\permanent\tolerant\protected\def\definemathtoysymbol[#1]#*[#2]#*[#3]%
  {\ifarguments\or\or\or
     \protected\instance\edefcsname#1\endcsname{\math_toy_define_symbol_indeed{\mathcodechecked{#2}}{#3}}%
   \fi}

\protected\def\math_toy_define_symbol_traced#1#2%
  {\expanded{\discretionary class #1 %
     {$\givenmathstyle\the\mathstyle \darkred   #2$}%
     {$\givenmathstyle\the\mathstyle \darkblue  #2$}%
     {$\givenmathstyle\the\mathstyle \darkgreen #2$}}}

\protected\def\math_toy_define_symbol_normal#1#2%
  {\expanded{\discretionary class #1 %
     {$\givenmathstyle\the\mathstyle #2$}%
     {$\givenmathstyle\the\mathstyle #2$}%
     {$\givenmathstyle\the\mathstyle #2$}}}

\installtextracker
  {math.toysymbol}
  {\let\math_toy_define_symbol_indeed\math_toy_define_symbol_traced}
  {\let\math_toy_define_symbol_indeed\math_toy_define_symbol_normal}

\let\math_toy_define_symbol_indeed\math_toy_define_symbol_normal

\protect
