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%D \module
%D [ file=t-amsl,
%D version=2004.11.18,
%D title=\CONTEXT\ User Module,
%D subtitle=AMS-LaTeX compatibility,
%D author=Giuseppe Bilotta,
%D date=\currentdate,
%D copyright={PRAGMA / Giuseppe Bilotta}]
%D This ConTeXt module is intended to provide AMS-LaTeX-like
%D functionality to ConTeXt
% \doifdefined{\amslatexmath}{\message{\amslatexmath}\endinput}
% \def\amslatexmath{AMS-LaTeX compatibility module already loaded}
\usemodule[newmat]
\def\stackrel#1#2{\mathrel{\mathop{#2}\limits^{#1}}}
\def\underset#1#2{\mathrel{\mathop{#2}\limits_{#1}}}
%D Formulas
% \setupformulas[indentnext=no]
% The following requires a patch to work correctly:
\setupformulas[indentnext=auto]
\let\[\startformula
\def\]{\stopformula\ignorespaces}
\def\(#1\){\mathematics{#1}}
\def\startalign{\grabuntil{stopalign}\dostarteqalign}
\def\dostarteqalign#1%
{\startformula
\let\\\cr
\eqalign{#1\crcr}
\stopformula}
\let\stopalign\relax
\def\startgather{\grabuntil{stopgather}\dostartgather}
\def\dostartgather#1%
{\startformula
\def\\{\cr&}%
\eqalign{\crcr}
\stopformula}
\let\stopgather\relax
%D Blocks used in formulas
%D LaTeX "array"
\unprotect
\newdimen\arraycolsep
\newdimen\prearraycolsep
\newdimen\postarraycolsep
\newcount\amp@count
\arraycolsep1ex % todo: hook into everymath
\newdimen\arrayrowsep
\arrayrowsep1ex % todo: hook into everymath
% \let\@arraycr\crcr
\def\@arraycr{\crcr\noalign{\hrule height\arrayrowsep width 0pt}}
\newtoks\arraypreamble
\def\startarray#1%
{\begingroup% needed? erroneous?
% TODO scan array preamble
% preamble is assumed to be a sequence of
% l,r,c which determine whether the specific column should be
% left-aligned, right-aligned or centered
\arraypreamble{\tabskip\arraycolsep}%
\amp@count0
\let\arrayboxcommand\vcenter
\scanarraypreamble#1\relax}
\def\scanpreamblenext
{\afterassignment\doscanarraypreamble\let\next=}
\def\scanarraypreamble
{\let\array!l=l
\let\array!r=r
\let\array!c=c
\let\array!d=d
\let\array!t=t
\scanpreamblenext}
\def\arrayaddleftaligned {\appendtoks&$##$\hss\to\arraypreamble}
\def\arrayaddrightaligned{\appendtoks&\hss$##$\to\arraypreamble}
\def\arrayaddcentered {\appendtoks&\hss$##$\hss\to\arraypreamble}
\def\arrayaddtextual {\appendtoks&$\text{##}$\hss\to\arraypreamble}
\def\arrayadddisplayed {\appendtoks&$\displaystyle##$\hss\to\arraypreamble}
\def\doscanarraypreamble
{\ifx\next\array!l
\def\!!next
{\arrayaddleftaligned
\advance\amp@count1
\scanpreamblenext}%
\else\ifx\next\array!r
\def\!!next
{\arrayaddrightaligned
\advance\amp@count1
\scanpreamblenext}%
\else\ifx\next\array!c
\def\!!next
{\arrayaddcentered
\advance\amp@count1
\scanpreamblenext}%
\else\ifx\next\array!t
\def\!!next
{\arrayaddtextual
\advance\amp@count1
\scanpreamblenext}%
\else\ifx\next\array!d
\def\!!next
{\arrayadddisplayed
\advance\amp@count1
\scanpreamblenext}%
\else\if\next\relax
\def\!!next
{\appendtoks\tabskip\postarraycolsep\cr\to\arraypreamble
\dostartarray}%
\else
% TODO error
\message{\meaning\next\space unexpected in preamble; replacing with 'c'}
\def\!!next
{\arrayaddcentered
\advance\amp@count1
\scanpreamblenext}%
\fi \fi \fi \fi \fi \fi
\!!next}
\def\dostartarray
{\arrayboxcommand\bgroup % TODO or vcenter or vtop
\let\\\@arraycr
% \showthe\arraypreamble
\tabskip\prearraycolsep
\expandafter\halign\expandafter\bgroup\the\arraypreamble}
\def\stoparray
{\crcr\egroup
\egroup
\endgroup}
\def\startcases
{\left\{\startarray{ll}}
\def\stopcases
{\stoparray\right.}
\def\startbigcases
{\left\{\startarray{dl}}
\def\stopbigcases
{\stoparray\right.}
\def\cases#1
{\left\{\startarray{lt}#1\crcr\stoparray\right.}
%D Font Stuff
%D
%D First of all, we need Fraktur to be loaded correctly, something
%D which ConTeXt doesn't do by default (at least by now)
%D Can't find a better, faster, cleaner way to do it;
%D it should probably be added to ConTeXt default for AMS, anyway
\definebodyfont [12pt,11pt,10pt,9pt] [mm] [mc=eufm10 sa 1]
\definebodyfont [8pt,7pt,6pt] [mm] [mc=eufm7 sa 1]
\definebodyfont [5pt] [mm] [mc=eufm5]
%D to make sure they get loaded, we make a font change
%D we restore rm afterwards, not having a way to decide which one
%D was active (anyway, rm is a pretty safe bet when loading
%D a module \dots)
\switchtobodyfont[mm]
\switchtobodyfont[rm]
%D Next we restore LaTeX-like behaviour for \cal, \Bbd, \frak
\definefamilysynonym[default][calligraphic][sy]
\definefamilysynonym[default][blackboard] [mb]
%D The next one requires eufm to be loaded properly, as above
\definefamilysynonym[default][fraktur][mc]
\def\!mathcal {\fam\purefamily{calligraphic}}
\def\!mathBbd {\fam\purefamily{blackboard}}
\def\!mathfrak{\fam\purefamily{fraktur}}
\def\mathcal #1{{\!mathcal #1}}
\def\mathbb #1{{\!mathBbd #1}}
\def\mathfrak#1{{\!mathfrak#1}}
\appendtoks
\let\cal \!mathcal
\let\Bbd \!mathBbd
\let\frak\!mathfrak
\to\everymath
\appendtoks
\let\cal \!mathcal
\let\Bbd \!mathBbd
\let\frak\!mathfrak
\to\everydisplay
\enablemathcollection[ams] \usemathcollection[ams]
%D Reference formats
\definereferenceformat[eqref][left=(,right=)]
\protect \endinput
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