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%D \module
%D [ file=m-dimensions,
%D version=1997.03.19,
%D title=\CONTEXT\ Extra Modules,
%D subtitle=Scientific Units,
%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.
\unprotect
\registerctxluafile{m-dimensions}{}
\startmodule[dimensions]
%D \macros
%D {su}
%D
%D We have been using the units module (and its predecessor) for over a decade
%D now but when we moved on to \LUATEX\ a variant was prototyped that permits a
%D less texie coding. I finally picked up that thread and cleaned up the code a
%D bit so users can now play with it. (The main reason was that I wanted to
%D test exporting.)
%D
%D \startbuffer
%D \su{10 km/h}
%D 10\su{km/h}
%D 10 \su{km/h}
%D $10\su{km/h}$
%D $10 \su{km/h}$
%D 10 \su{KiloMeter/Hour}
%D 10 \su{kilometer/hour}
%D 10 \su{km/h}
%D 10 \su{kilometer per hour}
%D 10 \su{km / h}
%D 10 \su{ km / h }
%D 10 \su{km/ms2}
%D 10 \su{meter per second}
%D 10 \su{cubic meter}
%D 10 \su{cubic meter per second}
%D 10 \su{cubic meter / second}
%D $10 \su{cubic meter / second}$
%D 30 \su{kilo pascal }
%D 30 \su{kilo pascal square meter / second}
%D 30 \su{kilo pascal square meter / second kelvin}
%D 30 \su{crap}
%D $ \frac{10 \su{m/s}}{20 \su{m/s}} $
%D \stopbuffer
%D
%D \typebuffer
%D
%D Result: \getbuffer
\newconstant \c_scientificunit_mode % 0=text 1=math
\newconstant \c_scientificunit_state % 0=start 1=suffix 2=operator 3=unit 4=prefix 5=number
\newconditional\c_scientificunit_number
% tags and export
% smash == snapper
% hbox ook in mmode
\def\scientificunithalfspace{\thinspace}
\def\scientificunitbackspace{\negthinspace}
\newtoks \everyscientificunit % we keep the old \units command so we need a longer one
\unexpanded\def\scientificunit#1%
{\begingroup
\the\everyscientificunit
\removeunwantedspaces
\ifmmode
\c_scientificunit_mode\plusone
\rm\tf
\mathtf
\fi
\scientificunit_indeed{#1}%
\scientificunit_finish
\endgroup}
\appendtoks
\let\scientificunit\scientificunit_indeed
\to \everyscientificunit
\let\su\scientificunit
\appendtoks
\let\su\scientificunit_indeed
\to \everyscientificunit
\unexpanded\def\scientificunit_indeed#1{\ctxcommand{scientificunit(\!!bs#1\!!es)}}
\unexpanded\def\scientificunitPUS#1#2#3{\scientificunit_next#1#2\scientificunitraise{#3}\c_scientificunit_state\plusone} % suffix
\unexpanded\def\scientificunitPU #1#2{\scientificunit_next#1#2\c_scientificunit_state \plusthree} % unit
\unexpanded\def\scientificunitPS #1#2{\scientificunit_next#1\scientificunitraise{#2}\c_scientificunit_state \plusone} % suffix
\unexpanded\def\scientificunitUS #1#2{\scientificunit_next#1\scientificunitraise{#2}\c_scientificunit_state \plusone} % suffix
\unexpanded\def\scientificunitP #1{\scientificunit_next#1\c_scientificunit_state \plusfour} % prefix
\unexpanded\def\scientificunitU #1{\scientificunit_next#1\c_scientificunit_state \plusthree} % unit
\unexpanded\def\scientificunitS #1{\scientificunit_start{}\scientificunitraise{#1}\c_scientificunit_state \plusone} % suffix
\unexpanded\def\scientificunitO #1{\scientificunit_start#1\c_scientificunit_state \plustwo} % operator
\unexpanded\def\scientificunitN #1{\scientificunit_start#1\c_scientificunit_state \plusfive} % number
\setelementnature[unit] [mixed]
\setelementnature[quantity][mixed]
\unexpanded\def\scientificunitN#1%
{\ifmmode
#1%
\else
\dostarttagged{quantity}\empty
\dostarttagged{number}\empty
#1%
\dostoptagged
\settrue\c_scientificunit_number
\fi
%\scientificunit_start
\c_scientificunit_state\plusfive}
\def\scientificunit_start
{\ifmmode
\dostarttagged\t!mathaction{unit}%
\bgroup % make an mrow
\else
\dostarttagged{unit}\empty
\fi
\let\scientificunit_finish\scientificunit_stop
\let\scientificunit_start\relax}
\def\scientificunit_stop
{\ifmmode
\egroup
\fi
\ifconditional\c_scientificunit_number
\dostoptagged
\fi
\dostoptagged}
\def\scientificunitraise
{\ifnum\c_scientificunit_mode=\plusone
\expandafter\normalsuperscript
\else
\expandafter\high
\fi}
\def\scientificunitlower
{\ifnum\c_scientificunit_mode=\plusone
\expandafter\normalsubscript
\else
\expandafter\low
\fi}
\unexpanded\def\scientificunit_next
{\ifcase\c_scientificunit_state % start
\scientificunithalfspace
\scientificunithalfspace
\or % suffix
{\cdot}% \scientificunithalfspace
\or % operator
\or % unit
{\cdot}% \scientificunithalfspace
\or % prefix
\or % number
\scientificunithalfspace
\scientificunithalfspace
\fi
\scientificunit_start}
\unexpanded\def\scientificunitTIMES
{\ifnum\c_scientificunit_state=\plusone % suffix
\else
\scientificunithalfspace
\fi
\cdot} % or \times
\unexpanded\def\scientificunitOUTOF
{\ifnum\c_scientificunit_state=\plusone % suffix
\else
\scientificunithalfspace
\fi
:}
\unexpanded\def\scientificunitSOLIDUS
{\ifnum\c_scientificunit_state=\plusone % suffix
\scientificunitbackspace
\fi
{/}%
}%\scientificunitbackspace}
\stopmodule
\protect \endinput
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