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%D \module
%D [ file=math-fen,
%D version=2012.02.18,
%D title=\CONTEXT\ Math Macros,
%D subtitle=Fences,
%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 / Fences}
\unprotect
% todo: mathstyle
% \definemathfence [fancybracket] [bracket] [command=yes,color=blue]
%
% test $|x|$ test \par
% test $||x||$ test (okay) \par
% test $a\left|\frac{1}{b}\right|c$ test \par
% test $a\left||\frac{1}{b}\right||c$ test (not okay) \par
%
% \setupmathfences [color=red]
%
% test $a\fenced[bar]{\frac{1}{b}}c$ test \par
% test $a\fenced[doublebar]{\frac{1}{b}}c$ test \par
% test $a\fenced[bracket]{\frac{1}{b}}c$ test \par
% test $a\fancybracket{\frac{1}{b}}c$ test \par
\installcorenamespace{mathfences}
\installcommandhandler \??mathfences {mathfence} \??mathfences
\let\setupmathfences\setupmathfence
\setupmathfences
[\c!left=,
\c!right=,
\c!middle=,
\c!mathstyle=,
\c!color=,
\c!command=]
\appendtoks
\edef\p_command{\mathfenceparameter\c!command}%
\ifx\p_command\v!yes
\setuevalue\currentmathfence{\math_fenced_fenced[\currentmathfence]}%
\fi
\to \everydefinemathfence
% we need the direct use of \Udelimiter because of { etc
\def\math_fenced_left {\edef\p_left{\mathfenceparameter\c!left}%
\math_fenced_color_push
\normalleft\ifx\p_left\empty.\else\Udelimiter\plusfour\fam\p_left\fi
\math_fenced_color_pop}
\def\math_fenced_middle{\edef\p_middle{\mathfenceparameter\c!middle}%
\mskip\thinmuskip
\math_fenced_color_push
\normalmiddle\ifx\p_middle\empty.\else\Udelimiter\plusfour\fam\p_middle\fi
\math_fenced_color_pop
\mskip\thinmuskip}
\def\math_fenced_right {\edef\p_right{\mathfenceparameter\c!right}%
\math_fenced_color_push
\normalright\ifx\p_right\empty.\else\Udelimiter\plusfive\fam\p_right\fi
\math_fenced_color_pop}
\def\math_fenced_color_do_push{\pushcolor[\p_math_fenced_color]}
\let\math_fenced_color_do_pop \popcolor
\let\fence \relax
\let\fenced\relax
\unexpanded\def\math_fenced_fenced_start#1%
{\begingroup
\edef\currentmathfence{#1}%
\startusemathstyleparameter\mathfenceparameter
\let\fence\math_fenced_middle
\edef\p_math_fenced_color{\mathfenceparameter\c!color}%
\ifx\p_math_fenced_color\empty
\let\math_fenced_color_push\donothing
\let\math_fenced_color_pop \donothing
\else
\let\math_fenced_color_push\math_fenced_color_do_push
\let\math_fenced_color_pop \math_fenced_color_do_pop
\fi
\math_fenced_left}
\unexpanded\def\math_fenced_fenced_stop#1%
{\edef\currentmathfence{#1}%
\math_fenced_right
\stopusemathstyleparameter
\endgroup}
\unexpanded\def\math_fenced_fenced[#1]#2%
{\math_fenced_fenced_start{#1}%
#2%
\math_fenced_right
\stopusemathstyleparameter
\endgroup}
\appendtoks
\let\fenced\math_fenced_fenced
\to \everymathematics
% todo: | in mathmode letter
%
% \appendtoks
% \let\bar\letterbar
% \to \everymathematics
%
% but then we don't have it in embedded text too so ...
\definemathfence [parenthesis] [\c!left="0028,\c!right="0029]
\definemathfence [bracket] [\c!left="005B,\c!right="005D]
\definemathfence [brace] [\c!left="007B,\c!right="007D]
\definemathfence [bar] [\c!left="007C,\c!right="007C]
\definemathfence [doublebar] [\c!left="2016,\c!right="2016]
\definemathfence [angle] [\c!left="003C,\c!right="003E]
\definemathfence [nothing]
%D A bonus:
\unexpanded\def\Lparent {\math_fenced_fenced_start{parenthesis}} \unexpanded\def\Rparent {\math_fenced_fenced_stop{parenthesis}}
\unexpanded\def\Lbracket {\math_fenced_fenced_start{bracket}} \unexpanded\def\Rbracket {\math_fenced_fenced_stop{bracket}}
\unexpanded\def\Lbrace {\math_fenced_fenced_start{brace}} \unexpanded\def\Rbrace {\math_fenced_fenced_stop{brace}}
\unexpanded\def\Langle {\math_fenced_fenced_start{angle}} \unexpanded\def\Rangle {\math_fenced_fenced_stop{angle}}
\unexpanded\def\Lbar {\math_fenced_fenced_start{bar}} \unexpanded\def\Rbar {\math_fenced_fenced_stop{bar}}
\unexpanded\def\Ldoublebar {\math_fenced_fenced_start{doublebar}} \unexpanded\def\Rdoublebar{\math_fenced_fenced_stop{doublebar}}
\unexpanded\def\Lnothing {\math_fenced_fenced_start{nothing}} \unexpanded\def\Rnothing {\math_fenced_fenced_stop{nothing}}
%D And another one:
% \setupmathfences[color=darkgreen]
%
% \startformula
% \left{ \frac{1}{a} \right}
% \left[ \frac{1}{b} \right]
% \left( \frac{1}{c} \right)
% \left< \frac{1}{d} \right>
% \left| \frac{1}{e} \right|
% \stopformula
\installcorenamespace{mathleft}
\installcorenamespace{mathright}
\unexpanded\def\left {\afterassignment\math_left \let\next=}
\unexpanded\def\right{\afterassignment\math_right\let\next=}
% \def\math_left
% {\csname\??mathleft
% \ifcsname\??mathleft\meaning\next\endcsname
% \meaning\next
% \else
% \s!unknown
% \fi
% \endcsname}
% \def\math_right
% {\csname\??mathright
% \ifcsname\??mathright\meaning\next\endcsname
% \meaning\next
% \else
% \s!unknown
% \fi
% \endcsname}
\def\math_left
{\edef\m_math_left{\meaning\next}%
\csname\??mathleft \ifcsname\??mathleft \m_math_left \endcsname\m_math_left \else\s!unknown\fi\endcsname}
\def\math_right
{\edef\m_math_right{\meaning\next}%
\csname\??mathright\ifcsname\??mathright\m_math_right\endcsname\m_math_right\else\s!unknown\fi\endcsname}
\setvalue{\??mathleft \s!unknown}{\normalleft \next}
\setvalue{\??mathright\s!unknown}{\normalright\next}
\bgroup
\let\next[ \global\expandafter\let\csname\??mathleft\meaning\next\endcsname\Lbracket \let\next] \global\expandafter\let\csname\??mathright\meaning\next\endcsname\Rbracket
\let\next( \global\expandafter\let\csname\??mathleft\meaning\next\endcsname\Lparent \let\next) \global\expandafter\let\csname\??mathright\meaning\next\endcsname\Rparent
\let\next< \global\expandafter\let\csname\??mathleft\meaning\next\endcsname\Langle \let\next> \global\expandafter\let\csname\??mathright\meaning\next\endcsname\Rangle
\let\next{ \global\expandafter\let\csname\??mathleft\meaning\next\endcsname\Lbrace \let\next} \global\expandafter\let\csname\??mathright\meaning\next\endcsname\Rbrace
\let\next| \global\expandafter\let\csname\??mathleft\meaning\next\endcsname\Lbar \let\next| \global\expandafter\let\csname\??mathright\meaning\next\endcsname\Rbar
\let\next‖ \global\expandafter\let\csname\??mathleft\meaning\next\endcsname\Ldoublebar \let\next‖ \global\expandafter\let\csname\??mathright\meaning\next\endcsname\Rdoublebar
\let\next. \global\expandafter\let\csname\??mathleft\meaning\next\endcsname\Lnothing \let\next. \global\expandafter\let\csname\??mathright\meaning\next\endcsname\Rnothing
\egroup
%definemathfence [fancybracket] [bracket] [command=yes,color=red]
% experimental accents:
%
% \definemathoverextensible [top] [hoed] ["FE302]
% \definemathoverextensible [top] [slang] ["FE303]
\protect
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