%D \module
%D   [       file=supp-ran,
%D        version=2008-10-31,
%D          title=\CONTEXT\ Support Macros,
%D       subtitle=Random Number Generation,
%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 Support Macros / Random Number Generation}

%D This module is downward compatible in the sense that we've kept the user
%D interface (which uses intermediate variables).
%D
%D \starttyping
%D                   \type{new}: \dorecurse{10}{\randomnumber{1}{100} }\par
%D \setrandomseed{24}\type{set}: \dorecurse{10}{\randomnumber{1}{100} }\par
%D \setrandomseed{24}\type{set}: \dorecurse{10}{\randomnumber{1}{100} }\par
%D \setrandomseed{24}\type{set}: \dorecurse{10}{\randomnumber{1}{100} }\par
%D \pushrandomseed   \type{new}: \dorecurse{10}{\randomnumber{1}{100} }\par
%D \poprandomseed    \type{old}: \dorecurse{10}{\randomnumber{1}{100} }\par
%D                   \type{new}: \dorecurse{10}{\randomnumber{1}{100} }\par
%D \stoptyping

\registerctxluafile{supp-ran}{autosuffix}

\unprotect

\permanent\protected\def\getrandomcount #1#2#3{#1=\clf_getrandomnumber\numexpr#2\relax\numexpr#3\relax\relax}
\permanent\protected\def\getrandomdimen #1#2#3{#1=\clf_getrandomdimen\dimexpr#2\relax\dimexpr#3\relax\scaledpoint\relax}
\permanent\protected\def\getrandomnumber#1#2#3{\edef#1{\clf_getrandomnumber\numexpr#2\relax\numexpr#3\relax}}
\permanent\protected\def\getrandomfloat #1#2#3{\edef#1{\clf_getrandomfloat\dimexpr#2\relax\dimexpr#3\relax}}
\permanent\protected\def\setrandomseed      #1{\clf_setrandomseed\numexpr#1\relax}
\permanent\protected\def\getrandomseed      #1{\edef#1{\clf_getrandomseed}}
\permanent\protected\def\newrandomseed        {\clf_getrandomseed}
%permanent\protected\def\pushrandomseed       {\clf_pushrandomseed}
%permanent\protected\def\poprandomseed        {\clf_poprandomseed}
%permanent\protected\def\reuserandomseed      {\clf_reuserandomseed} % within push/pop

\aliased\let\freezerandomseed \pushrandomseed
\aliased\let\defrostrandomseed\poprandomseed

\setnewconstant \mpscaledmax 4095 % for old times sake

\permanent\def\randomnumber  #1#2{\clf_getrandomnumber\numexpr#1\relax\numexpr#2\relax}
\permanent\def\mprandomnumber    {\clf_getrandomnumber\zerocount\mpscaledmax}

%D \startbuffer
%D \enabletrackers[system.randomizer.details]
%D
%D \newrepeatablerandom\MyRandom {Welcome 2 America}
%D \newrepeatablerandom\MyRandomN{\randomnumber{0}{1000}}
%D \newrepeatablerandom\MyRandomM{\randomnumber{0}{1000}}
%D
%D \cldcontext{utilities.randomizer.getrepeatableseed()}\par
%D \cldcontext{utilities.randomizer.getrepeatableseed("default")}\par
%D \cldcontext{utilities.randomizer.getrepeatableseed("MyRandom")}\par
%D \cldcontext{utilities.randomizer.getrepeatableseed("MyRandomN")}\par
%D \cldcontext{utilities.randomizer.getrepeatableseed("MyRandomM")}\par
%D
%D \dorecurse{10}{\MyRandom\par}
%D
%D \startMPcode
%D     randomseed := repeatablerandom("MyRandom") ;
%D     draw image (
%D         for i=1 upto 10000 :
%D             draw origin randomized 100 ;
%D         endfor ;
%D     ) withpen pencircle scaled 1 ;
%D \stopMPcode
%D
%D \startluacode
%D     context(utilities.randomizer.getrepeatableseed("MyRandom"))
%D     context.par()
%D     local rep = utilities.randomizer.getrepeatable("MyRandom")
%D     for i=1,5 do
%D         context(rep())
%D         context.par()
%D     end
%D \stopluacode
%D \stopbuffer
%D
%D \typebuffer \blank \getbuffer \blank

\protect \endinput

