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%D \module
%D [ file=typo-scr,
%D version=2012.01.23, % very old ... 1995.10.10 .. moved from core-mis
%D title=\CONTEXT\ Typesetting 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 Typesetting Macros / Scripts}
\unprotect
%D I addition to the commands implemented here, we have alternative commands
%D \type {shiftup} and \type {shiftdown} that can work across paragraphs.
%D \macros
%D {low, high, definelow, definehigh, setuplow, setuphigh}
%D
%D Although \TEX\ is pretty well aware of super- and subscripts, its mechanism
%D is mainly tuned for math mode. The next few commands take care of script
%D texts both modes.
%D
%D \startbuffer
%D The higher\high{one goes} the lower\low{one drops}, or\lohi{yes}{no}?
%D \stopbuffer
%D
%D \typebuffer
%D \getbuffer
%D
%D Note the different placement of \type {\lohi}, where we need a bit more
%D space. The implementation looks a bit fuzzy, since some \type {\fontdimen}'s
%D are involved to determine the optimal placement.
\installcorenamespace {low}
\installcorenamespace {high}
\installcommandhandler \??low {low} \??low
\installcommandhandler \??high {high} \??high
\setuplow [\c!style=\tx,\c!distance=\zeropoint,\c!down=.48\exheight] % historical
\setuphigh[\c!style=\tx,\c!distance=\zeropoint,\c!up =.86\exheight] % values
\appendtoks \frozen\protected\edefcsname\currentlow \endcsname{\typo_scripts_low [\currentlow ]}\to \everydefinelow
\appendtoks \frozen\protected\edefcsname\currenthigh\endcsname{\typo_scripts_high[\currenthigh]}\to \everydefinehigh
\def\typo_scripts_distance#1%
{\edef\p_distance{#1\c!distance}%
\ifx\p_distance\v!tight
\tightfitboundary
\else
\kern\p_distance\relax
\fi}
%D \startbuffer
%D \setuplow [distance=\zeropoint]
%D \setuphigh[distance=\zeropoint]
%D
%D {\showglyphs f\high{x}\quad p\high{x}\quad}
%D
%D \setuplow [\c!distance=\v!tight]
%D \setuphigh[\c!distance=\v!tight]
%D
%D {\showglyphs f\high{x}\quad p\high{x}\quad}
%D \stopbuffer
%D
%D \typebuffer {\getbuffer}
% \type{f\kern\tightfitcompensation\high{x}}
% \type{f\tightfitboundary \high{x}}
\protected\def\typo_scripts_low[#1]#2%
{\dontleavehmode
\begingroup
\cdef\currentlow{#1}%
\typo_scripts_distance\lowparameter
\setbox\scratchbox\runninghbox\bgroup
\lower\lowparameter\c!down\hbox\bgroup
\ifempty\fontsize
\ifmmode
\mr % no color yet
\else
\uselowstyleandcolor\c!style\c!color
\fi
\else
\uselowstyleandcolor\c!style\c!color
\fi
\dostarttagged\t!sub\currentlow
#2%
\dostoptagged
\egroup
\egroup
\ht\scratchbox\strutht
\dp\scratchbox\strutdp
\box\scratchbox
\endgroup}
\protected\def\typo_scripts_high[#1]#2%
{\dontleavehmode
\begingroup
\cdef\currenthigh{#1}%
\typo_scripts_distance\highparameter
\setbox\scratchbox\runninghbox\bgroup
\raise\highparameter\c!up\hbox\bgroup
\ifempty\fontsize
\ifmmode
\mr % no color yet
\else
\usehighstyleandcolor\c!style\c!color
\fi
\else
\usehighstyleandcolor\c!style\c!color
\fi
\dostarttagged\t!sup\currenthigh
#2%
\dostoptagged
\egroup
\egroup
\ht\scratchbox\strutht
\dp\scratchbox\strutdp
\box\scratchbox
\endgroup}
\permanent\protected\def\low {\typo_scripts_low []}
\permanent\protected\def\high{\typo_scripts_high[]}
%D \macros
%D {lohi, hilo, definelohi, setuplohi}
%D
%D You can provide an optional keyword \type {left}, in which case the super and
%D subscripts will be aligned in a way that permits placement at the left of a word
%D (which means that it will be right aligned).
%D
%D \startbuffer
%D \lohi {aha} {ah} test \lohi {aha} {ah} test
%D \lohi [left] {aha} {ah} test \lohi [left] {aha} {ah} test
%D \lohi {aha} {ah} test \lohi {aha} {ah} test
%D \lohi [left] {aha} {ah}test \lohi [left] {aha} {ah} test
%D \stopbuffer
%D
%D \typebuffer
%D \getbuffer
\installcorenamespace {lowhigh}
\installcommandhandler \??lowhigh {lowhigh} \??lowhigh
\setuplowhigh
[\c!style=\tx,
\c!distance=.1\exheight, % these are
\c!up=.96\exheight, % historical
\c!down=.58\exheight] % values
\appendtoks
\frozen\edefcsname\currentlowhigh\endcsname{\typo_scripts_lowhigh[\currentlowhigh]}%
\to \everydefinelowhigh
\tolerant\protected\def\typo_scripts_lowhigh[#1]#*[#2]#:#3#4% todo: align .. [#1] is compatible hack
{\dontleavehmode
\runninghbox\bgroup
\cdef\currentlowhigh{#1}%
\typo_scripts_distance\lowhighparameter
\dostarttagged\t!subsup\currentlowhigh
\setbox\plusfour\hpack{\typo_scripts_lowhigh_low_high\lower\c!down\t!sub{#3}}%
\setbox\plussix \hpack{\typo_scripts_lowhigh_low_high\raise\c!up \t!sup{#4}}%
\edef\p_align{#2}%
\ifx\p_align\v!left
\ifdim\wd\plusfour<\wd\plussix
\setbox\plusfour\hpack to \wd\plussix {\hss\box\plusfour}%
\else
\setbox\plussix \hpack to \wd\plusfour{\hss\box\plussix }%
\fi
\fi
\ifdim\wd\plusfour<\wd\plussix
\wd\plusfour\zeropoint
\box\plusfour
\box\plussix
\else
\wd\plussix\zeropoint
\box\plussix
\box\plusfour
\fi
\dostoptagged
\egroup}
\def\typo_scripts_lowhigh_low_high#1#2#3#4%
{\setbox\scratchbox\hpack\bgroup
#1\lowhighparameter#2\hbox\bgroup
\ifempty\fontsize
\ifmmode
\mr % no color yet
\else
\uselowhighstyleandcolor\c!style\c!color
\fi
\else
\uselowhighstyleandcolor\c!style\c!color
\fi
\dostarttagged#3\empty
#4%
\dostoptagged
\egroup
\egroup
\ht\scratchbox\strutht
\dp\scratchbox\strutdp
\box\scratchbox}
\permanent\tolerant\protected\def\typo_scripts_highlow[#1]#*[#2]#:#3#4%
{\typo_scripts_lowhigh[#1][#2]{#4}{#3}}
\permanent\protected\def\lohi{\typo_scripts_lowhigh[]}
\permanent\protected\def\hilo{\typo_scripts_highlow[]}
%D \macros
%D {lowmidhigh, definelowmidhigh, setuplowmidhigh}
%D
%D The previous command originally didn't have definers. These were introduced when
%D the next showed up:
%D
%D \startbuffer
%D \definelow [MyLow] [style=\txx]
%D \definehigh [MyHigh] [style=\txx]
%D \definelowhigh [MyLoHi] [style=\txx]
%D \definelowmidhigh[MyLoMiHi][style=\txx]
%D
%D We have
%D \ruledhbox{\low {L}} and \ruledhbox{\MyLow {L}} and
%D \ruledhbox{\high {H}} and \ruledhbox{\MyHigh {H}} and
%D \ruledhbox{\lohi {L}{H}} and \ruledhbox{\MyLoHi {L}{H}} and
%D \ruledhbox{\lomihi{L}{M}{H}} and \ruledhbox{\MyLoMiHi{L}{M}{H}}.
%D \stopbuffer
%D
%D \typebuffer \getbuffer
\installcorenamespace {lowmidhigh}
\installcommandhandler \??lowmidhigh {lowmidhigh} \??lowmidhigh
\setuplowmidhigh
[\c!style=\tx,
\c!up=.8\struthtdp,
\c!down=.8\struthtdp]
\appendtoks
\frozen\edefcsname\currentlowmidhigh\endcsname{\typo_scripts_lowmidhigh[\currentlowmidhigh]}%
\to \everydefinelowmidhigh
\protected\def\typo_scripts_lowmidhigh[#1]#2#3#4%
{\dontleavehmode
\runninghbox\bgroup
\cdef\currentlowmidhigh{#1}%
\dostarttagged\t!subsup\currentlowmidhigh
\uselowmidhighstyleandcolor\c!style\c!color
\setstrut
\setbox\plustwo \hbox{\strut\dostarttagged\t!sub\empty#2\dostoptagged}%
\setbox\plusfour\hbox{\strut\dostarttagged\t!mid\empty#3\dostoptagged}% inefficient
\setbox\plussix \hbox{\strut\dostarttagged\t!sup\empty#4\dostoptagged}%
\scratchdimen \wd
\ifdim\wd\plustwo>\wd\plusfour
\ifdim\wd\plustwo>\wd\plussix
\plustwo
\else
\plussix
\fi
\else
\ifdim\wd\plusfour>\wd\plussix
\plusfour
\else
\plussix
\fi
\fi
\relax
\setbox\plustwo \hpack to \scratchdimen{\hss\lower\lowmidhighparameter\c!down\box\plustwo \hss}%
\setbox\plusfour\hpack to \scratchdimen{\hss \box\plusfour\hss}%
\setbox\plussix \hpack to \scratchdimen{\hss\raise\lowmidhighparameter\c!up \box\plussix \hss}%
\wd\plustwo \zeropoint
\wd\plusfour\zeropoint
\box\plusfour
\box\plustwo
\box\plussix
\dostoptagged
\egroup}
\permanent\protected\def\lomihi {\typo_scripts_lowmidhigh[]}
\permanent\protected\def\himilo#1#2#3{\typo_scripts_lowmidhigh[]{#3}{#2}{#1}}
\protect \endinput
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