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%D \module
%D [ file=core-stg,
%D version=2006.08.16,
%D title=\CONTEXT\ Core Macros,
%D subtitle=Strategies,
%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.
%D This is a prelude to strategies. It is rather old code
%D used in a project many years ago. Use with care since I
%D will pick up this thread. (moved from cont-new)
\unprotect
\def\s!strategy{strategy}
\def\currentstrategypass {1}
\def\currentstrategyvariable{0}
\def\maximumstrategypass {8}
\newconditional\strategypassneeded
\newconditional\strategypassforced
\definetwopasslist{\s!strategy}
\def\registerstrategypass
{\ifnum\currentstrategypass>\maximumstrategypass \else
\ifconditional\strategypassforced
\doglobal\increment\currentstrategypass
\else%\ifconditional\strategypassneeded
%\doglobal\increment\currentstrategypass
\fi%\fi
\fi
\savecurrentvalue\currentstrategypass{\currentstrategypass}}
\appendtoks \registerstrategypass \to \everybye % \everylastshipout
\def\setstrategyvariable#1#2% key value
{%\doifnotstrategyvariable{#1}{\global\settrue\strategypassneeded}%
\doglobal\increment\currentstrategyvariable
\savetaggedtwopassdata{\s!strategy}{\currentstrategyvariable}{#1}{#2}}
\def\doifstrategyvariableelse#1#2#3%
{\getstrategyvariable{#1}\iftwopassdatafound#2\else#3\fi}
\def\getstrategyvariable#1% key
{\findtwopassdata{\s!strategy}{#1}%
\setxvalue{\s!strategy:#1}{\twopassdata}}
\def\retainstrategyvariable#1% key
{\expanded{\setstrategyvariable{#1}{\strategyvariable{#1}}}}
\def\strategyvariable#1% key
{\csname\s!strategy:#1\endcsname}
\let\stratvar\strategyvariable
\def\forcestrategy{\global\settrue \strategypassforced}
\def\abortstrategy{\global\setfalse\strategypassforced}
\def\doifstrategyvariableelse#1#2#3%
{\getstrategyvariable{#1}\iftwopassdatafound#2\else#3\fi}
\def\doifstrategyvariable #1#2{\doifstrategyvariableelse{#1}{#2}{}}
\def\doifnotstrategyvariable#1#2{\doifstrategyvariableelse{#1}{}{#2}}
\protect \endinput
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