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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
%D This module permits overloading of accents so that we can do fancy things. The
%D implementation is similar to stackers. By default accenst are defined in a simple
%D way. Contrary to extensibles accents cannot grow indefinitely. Alas the
%D implementation of accents is different too, in the sense that they are
%D prepositioned i.e. are already raised. (In my opinion for no real reason as they
%D need to adapt anyway).
%D
%D In \MKIV\ we used virtual characters in the "FE* range but in \LMTX\ we do it a bit
%D different as we have a more powerful virtual subsystem. For details on the older
%D but neat approach see the lua and mkiv files.
%D
%D Older implementations are kept in the \MKII\ and \MKIV\ modules for educational
%D purposes.
\installcorenamespace{mathaccents}
\installcommandhandler \??mathaccents {mathaccent} \??mathaccents
\aliased\let\setupmathaccents\setupmathaccent
\setupmathaccents
[\c!top=,
\c!bottom=,
\c!mathstyle=,
\c!color=,
\c!stretch=\v!no,
\c!define=\v!yes] % not used
\definemathaccent
[\v!both]
\definemathaccent
[\v!top]
[\v!both]
\definemathaccent
[\v!bottom]
[\v!both]
\permanent\tolerant\protected\def\definemathtopaccent[#1]#*[#2]#*[#3]% class name top
{\ifparameter#3\or
\frozen\protected\instance\edefcsname#2\endcsname{\math_accent_make_double {#1}\plusone{\number#3}\zerocount}%
\else
\frozen\protected\instance\edefcsname#1\endcsname{\math_accent_make_double\noexpand\currentmathaccent\plusone{\number#2}\zerocount}%
\fi}
\permanent\tolerant\protected\def\definemathbottomaccent[#1]#*[#2]#*[#3]% class name bottom
{\ifparameter#3\or
\frozen\protected\instance\edefcsname#2\endcsname{\math_accent_make_double {#1}\plustwo\zerocount{\number#3}}%
\else
\frozen\protected\instance\edefcsname#1\endcsname{\math_accent_make_double\noexpand\currentmathaccent\plustwo\zerocount{\number#2}}%
\fi}
\permanent\tolerant\protected\def\definemathdoubleaccent[#1]#*[#2]#*[#3]#*[#4]% class name top bottom
{\ifparameter#4\or
\frozen\protected\instance\edefcsname#2\endcsname{\math_accent_make_double {#1}\plusthree{\number#3}{\number#4}}%
\else
\frozen\protected\instance\edefcsname#1\endcsname{\math_accent_make_double\noexpand\currentmathaccent\plusthree{\number#2}{\number#3}}%
\fi}
\installlocalcurrenthandler \??mathaccents {mathaccent}
\tolerant\protected\def\math_accent_make_double#class#kind#top#bottom#*[#settings]#:#content%
{\beginmathgroup
\setlocalmathaccentcurrent{#class}% \edef\currentmathaccent{#class}%
\startusemathstyleparameter\mathaccentparameter\c!mathstyle
\setupcurrentmathaccent[#settings]%
\edef\m_fixed{\ifcstok{\mathaccentparameter\c!stretch}\v!yes\else\s!fixed\fi}%
\Umathaccent
\usedcolorparameterattributes{\mathaccentparameter\c!color}%
% nooverflow % there is never na overflow anyway but we do accept thekey
\ifcase#kind\or
top \m_fixed
\fam\zerocount#top
\or
bottom \m_fixed
\fam\zerocount#bottom
\or
both \m_fixed
\fam\zerocount#top
\fam\zerocount#bottom
\fi
{\ifconditional\c_math_accent_auto_dotless\mathdotless\fi#content}%
\stopusemathstyleparameter
\endmathgroup}
%D Relative new:
\newconditional\c_math_accent_auto_dotless \settrue\c_math_accent_auto_dotless % cf opentype math
% \aliased\let\normalgrave\grave
% \aliased\let\normalddot \ddot
% \aliased\let\normalbar \bar
% \aliased\let\normalacute\acute
% \aliased\let\normalhat \hat \aliased\let\normalwidehat \widehat
% \aliased\let\normalcheck\check
% \aliased\let\normalbreve\breve
% \aliased\let\normaldot \dot
% \aliased\let\normalring \ring
% \aliased\let\normaltilde\tilde
% \aliased\let\normaldddot\dddot
\pushoverloadmode
% These retain the given unicode values ... but can stretch when configured
% to do so: \setupmathaccent[\v!top][\c!stretch=\v!yes]
\definemathtopaccent[\v!top][grave]["0060] % these are old school
\definemathtopaccent[\v!top][ddot] ["00A8]
\definemathtopaccent[\v!top][bar] ["00AF]
\definemathtopaccent[\v!top][acute]["00B4]
\definemathtopaccent[\v!top][hat] ["02C6]
\definemathtopaccent[\v!top][check]["02C7]
\definemathtopaccent[\v!top][breve]["02D8]
\definemathtopaccent[\v!top][dot] ["02D9]
\definemathtopaccent[\v!top][ring] ["02DA]
\definemathtopaccent[\v!top][tilde]["02DC]
\definemathtopaccent[\v!top][dddot]["20DB]
\definemathaccent
[\v!top:\v!stretch]
[\v!top]
[\c!stretch=\v!yes]
%D We have a problem. We can use stackers but then we need to adapt the dimensions
%D which is font dependent. So, for now we keep them as accents.
\definemathtopaccent[\v!top:\v!stretch][widegrave]["0300] % these are generic modern
\definemathtopaccent[\v!top:\v!stretch][wideddot] ["0308]
\definemathtopaccent[\v!top:\v!stretch][widebar] ["0304]
\definemathtopaccent[\v!top:\v!stretch][wideacute]["0301]
\definemathtopaccent[\v!top:\v!stretch][widehat] ["0302]
\definemathtopaccent[\v!top:\v!stretch][widecheck]["030C]
\definemathtopaccent[\v!top:\v!stretch][widebreve]["0306]
\definemathtopaccent[\v!top:\v!stretch][widedot] ["0307]
\definemathtopaccent[\v!top:\v!stretch][widering] ["030A]
\definemathtopaccent[\v!top:\v!stretch][widetilde]["0303]
\definemathtopaccent[\v!top:\v!stretch][widedddot]["20DB]
\aliased\let\mathring\ring % for a while
\popoverloadmode
\protect \endinput
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