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%D \module
%D [ file=math-int,
%D version=2007.07.19,
%D title=\CONTEXT\ Math Macros,
%D subtitle=Scripts,
%D author={Hans Hagen \& Taco Hoekwater \& Aditya Mahajan},
%D date=\currentdate,
%D copyright=\PRAGMA]
%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 / Integrals}
\unprotect
%D \startbuffer
%D $\int_a^b f(x) dx$ and also
%D $\iint_a^b f(x,y) dxdy$, $\iiint_a^b f(x,y) dxdy$,
%D $\iiiint_a^b f(x) dx$
%D \startformula
%D \int_a^b f(x) dx \quad
%D \iint_a^b f(x) dx \quad
%D \iiint_a^b f(x) dx \quad
%D \iiiint_a^b f(x) dx \quad
%D \stopformula
%D \stopbuffer
%D
%D Default: \getbuffer
%D
%D Displaylimits: \setupmathematics[integral=displaylimits] \getbuffer
%D
%D Limits: \setupmathematics[integral=limits] \getbuffer
\chardef\intlimitcode\zerocount % 0 nolimits 1 displaylimits 2 limits
\def\intlimits
{\ifcase\intlimitcode \nolimits \or \displaylimits \or \limits \fi}
\ifx\v!integral\undefined \def\v!integral{integral} \fi
\appendtoks
\processaction
[\mathematicsparameter\v!integral]
[ nolimits=>\chardef\intlimitcode\zerocount,
displaylimits=>\chardef\intlimitcode\plusone,
limits=>\chardef\intlimitcode\plustwo]%
\to \everysetupmathematics
\setupmathematics
[\v!integral=nolimits]
%D More integrals (AM):
\definemathcommand [iint] {\repeatintegral\plusone }
\definemathcommand [iiint] {\repeatintegral\plustwo }
\definemathcommand [iiiint] {\repeatintegral\plusthree}
%def\integralrepeatsymbol{\intop}
\def\integralrepeatsymbol{{\int}}
\def\repeatintegral#1%
{\scratchtoks\emptytoks
\let\dointlimits\donothing
\let\dodointlimits\intlimits
\dorecurse{#1}{\appendtoks \integralrepeatsymbol \dointkern \to \scratchtoks}
\appendtoks \intop \dointlimits \dodointlimits \to \scratchtoks
\edef\dodorepeatintegral{\the\scratchtoks}%
\futurelet\next\dorepeatintegral}
%D If the \type{\limits} option is used after \type{\iint}, use
%D \type{\mathop} and fudge the left hand space a bit to make the
%D subscript visually centered.
\def\dointkern
{\mkern-6mu\mathchoice{\mkern-3mu}{}{}{}}
\def\dorepeatintegral
{\ifx\next\limits \dointlimitcorrection \else
\ifx\next\displaylimits \dointlimitcorrection \else
\ifx\next\nolimits \donothing \else
\ifcase\intlimitcode\else \dointlimitcorrection \fi\fi\fi\fi
\dodorepeatintegral}
\def\dointlimitcorrection
{\mkern-7mu\mathchoice{\mkern-2mu}{}{}{}%
\mathop\bgroup\mkern7mu\mathchoice{\mkern2mu}{}{}{}\let\dointlimits\egroup}
\protect \endinput
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