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%D \module
%D [ file=math-acc,
%D version=2013.07.31,
%D title=\CONTEXT\ Math Macros,
%D subtitle=Accents,
%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 / Accents}
% There are probably errors ... too distracted by amazing (piano) music videos running
% on top of scite ... so: experimental code.
\unprotect
% This module permits overloading of accents so that we can do fancy things. The
% implementation is similar to stackers. By default accenst are defined in a simple
% way. Contrary to extensibles accents cannot grow indefinitely. Alas the
% implementation of accents is different too, in the sense that they are
% prepositioned i.e. are already raised. (In my opinion for no real reason as they
% need to adapt anyway).
%
% $ \ruledhbox{$H$} \hat{H} \ruledhbox{$\widehat{H}$} \widehat{H} $
%
% One alternative is:
%
% \definemathoverextensible [top] [hoed] ["FE302]
% \definemathoverextensible [top] [slang] ["FE303]
%
% $ \hoed{H} \ruledhbox{$\hoed{H}$} \ruledhbox{$\hoed{\tf H}$} \slang{H} $
%
% But that nills the italic correction (and I'm in nood to mess with that again).
%
% \definemathaccents [myaccents] [color=darkred]
% \definemathtopaccent [myaccents] [mywidehat] ["0302]
%
% $ \hat{H} \widehat{H} \mywidehat{H} $
% A first variant (kept for educational purposed):
%
% \installcorenamespace{mathaccents}
%
% \installcommandhandler \??mathaccents {mathaccent} \??mathaccents
%
% \let\setupmathaccents\setupmathaccent
%
% \setupmathaccents
% [\c!top=,
% \c!bottom=,
% \c!mathstyle=,
% \c!color=,
% \c!command=\v!yes]
%
% \appendtoks
% \edef\p_top_bottom{\namedmathaccentparameter\currentmathaccent\c!top\namedmathaccentparameter\currentmathaccent\c!bottom}%
% \ifx\p_top_bottom\empty\else
% \edef\p_command{\mathaccentparameter\c!command}%
% \ifx\p_command\v!yes
% \setuevalue\currentmathaccent{\math_accent{\currentmathaccent}}%
% \fi
% \fi
% \to \everydefinemathaccent
%
% \def\math_accented_color_do_push{\pushcolor[\p_math_accent_color]}
% \let\math_accented_color_do_pop \popcolor
%
% \unexpanded\def\math_accent#1#2%
% {\begingroup
% \edef\currentmathaccent{#1}%
% \edef\p_math_accent_top {\mathaccentparameter\c!top}%
% \edef\p_math_accent_bottom{\mathaccentparameter\c!bottom}%
% \edef\p_math_accent_color {\mathaccentparameter\c!color}%
% \startusemathstyleparameter\mathaccentparameter
% \ifx\p_math_accented_color\empty
% \let\math_accented_color_do_pop\donothing
% \else
% \let\math_accented_color_do_pop\popcolor
% \math_accented_color_do_push
% \fi
% \ifx\p_math_accent_top\empty
% \ifx\p_math_accent_bottom\empty
% \else
% \Umathaccent bottom \fam\zerocount\p_math_accent_bottom
% \fi
% \else
% \ifx\p_math_accent_bottom\empty
% \Umathaccent \fam\zerocount\p_math_accent_top
% \else
% \Umathaccent both \fam\zerocount\p_math_accent_top
% \fam\zerocount\p_math_accent_bottom
% \fi
% \fi
% {\popcolor#2}%
% \stopusemathstyleparameter
% \endgroup}
%
% \definemathaccent [myaccents] [\c!color=red]
% \definemathaccent [mywidehat] [myaccents] [\c!top="0302]
\installcorenamespace{mathaccents}
\installcommandhandler \??mathaccents {mathaccents} \??mathaccents
\setupmathaccents
[\c!top=,
\c!bottom=,
\c!mathstyle=,
\c!color=,
\c!command=\v!yes]
\definemathaccents
[\v!both]
\definemathaccents
[\v!top]
[\v!both]
\definemathaccents
[\v!bottom]
[\v!both]
\unexpanded\def\definemathtopaccent {\dotripleempty \math_accents_define_top }
\unexpanded\def\definemathbottomaccent{\dotripleempty \math_accents_define_bottom}
\unexpanded\def\definemathdoubleaccent{\doquadrupleempty\math_accents_define_double}
\def\math_accents_define_top[#1][#2][#3]% class name top
{\ifthirdargument
\setuevalue{#2}{\math_accents_make_double {#1}\plusone{\number#3}\zerocount}%
\else
\setuevalue{#1}{\math_accents_make_double\noexpand\currentmathaccents\plusone{\number#2}\zerocount}%
\fi}
\def\math_accents_define_bottom[#1][#2][#3]% class name bottom
{\ifthirdargument
\setuevalue{#2}{\math_accents_make_double {#1}\plustwo\zerocount{\number#3}}%
\else
\setuevalue{#1}{\math_accents_make_double\noexpand\currentmathaccents\plustwo\zerocount{\number#2}}%
\fi}
\def\math_accents_define_double[#1][#2][#3][#4]% class name top bottom
{\iffourthargument
\setuevalue{#2}{\math_accents_make_double {#1}\plusthree{\number#3}{\number#4}}%
\else
\setuevalue{#1}{\math_accents_make_double\noexpand\currentmathaccents\plusthree{\number#2}{\number#3}}%
\fi}
\def\math_accents_color_push_yes
{\pushcolor[\p_math_accent_color]%
\let\math_accents_color_pop\popcolor}
\def\math_accents_color_push_nop
{\let\math_accents_color_pop\donothing}
\unexpanded\def\math_accents_make_double#class#kind#top#bottom#content%
{\begingroup
\edef\currentmathaccents {#class}%
\edef\p_math_accent_color{\mathaccentsparameter\c!color}%
\startusemathstyleparameter\mathaccentsparameter
\ifx\p_math_accent_color\empty
\math_accents_color_push_nop
\else
\math_accents_color_push_yes
\fi
\ifcase#kind\or
\Umathaccent \fam\zerocount#top
\or
\Umathaccent bottom \fam\zerocount#bottom
\or
\Umathaccent both \fam\zerocount#top
\fam\zerocount#bottom
\fi
{\math_accents_color_pop#content}%
\stopusemathstyleparameter
\endgroup}
\protect \endinput
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