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%D \module
%D [ file=supp-ran,
%D version=1998.01.21,
%D title=\CONTEXT\ Support Macros,
%D subtitle=Random Number Generation,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%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}{Third Party Macros / Random Number Generation}
%D \macros
%D {getrandomcount, getrandomdimen,
%D getrandomfloat, getrandomnumber,
%D setrandomseed}
%D
%D This module load Donald Arseneau's generic file
%D \type{random.tex}. A small shell is needed because we
%D redefine some \TEX\ primitives. We also use different names
%D for the two generators and add an extra one.
%D
%D \starttypen
%D \getrandomcount \countregister {minimum} {maximum}
%D \getrandomdimen \dimenregister {minimum} {maximum}
%D \getrandomnumber \macroname {minimum} {maximum}
%D \getrandomfloat \macroname {minimum} {maximum}
%D \stoptypen
%D
%D Of course the file \type{random.tex} needs to be present.
%D To prevent name clashes, the \CONTEXT\ distribution
%D contains a copy in \type {thrd-ran.tex}.
%D
%D The randomseed can be set by:
%D
%D \starttypen
%d \setrandomseed{number>0}
%D \stoptypen
\ifx\nextrandom\undefined
\readfile{random.tex}
{\writestatus{loading}{Donald Arseneau's 'random.tex' (found)}}
{\writestatus{loading}{Donald Arseneau's 'random.tex' (not found)}}
\fi
\ifx\nextrandom\undefined
\def\setrannum#1#2#3{#1=1 }
\def\setrandim#1#2#3{#1=1pt}
\else
\let\normalnextrandom = \nextrandom
\global\chardef\randomseedfrozen=0
\def\nextrandom%
{\bgroup
\let\time =\normaltime
\let\day =\normalday
\let\month=\normalmonth
\let\year =\normalyear
\normalnextrandom
\gdef\nextrandom%
{\ifcase\randomseedfrozen\normalnextrandom\fi}%
\egroup}
% avoid scratch dimens 0 and 2
\unprotect
\def\setrandim#1#2#3% dimen register, minimum length, maximum length
{\scratchdimen=#2\edef\!!stringa{\number\scratchdimen}%
\scratchdimen=#3\edef\!!stringb{\number\scratchdimen}%
\setrannum\ranval\!!stringa\!!stringb
#1\ranval sp\relax}
\protect
\fi
\def\freezerandomseed%
{\ifcase\randomseedfrozen
\nextrandom \global\chardef\randomseedfrozen=1
\fi}
\def\defrostrandomseed%
{\ifcase\randomseedfrozen\else
\global\chardef\randomseedfrozen=0 \nextrandom
\fi}
\let\getrandomcount = \setrannum
\let\getrandomdimen = \setrandim
\def\getrandomnumber#1#2#3%
{\getrandomcount{\scratchcounter}{#2}{#3}%
\edef#1{\the\scratchcounter}}
\def\getrandomfloat#1#2#3%
{\getrandomdimen{\scratchdimen}{#2pt}{#3pt}%
\edef#1{\withoutpt\the\scratchdimen}}
\def\setrandomseed#1%
{\randomi=#1\relax}
\endinput
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