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%D \module
%D [ file=spac-pag,
%D version=2009.10.16, % 1997.03.31, was core-spa.tex
%D title=\CONTEXT\ Spacing Macros,
%D subtitle=Pages,
%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}{ConTeXt Spacing Macros / Pages}
\unprotect
%D A quick way to determine left|/|middle|/|right states
%D (experimental).
\setvalue{\??as\v!left }{0}
\setvalue{\??as\v!middle}{1}
\setvalue{\??as\v!right }{2}
\def\setalignmentswitch#1%
{\chardef\alignmentswitch0\csname\??as#1\endcsname\relax}
\newcount \noftrackedpagestates
\newif \ifpagestatemismatch
\newcount \realpagestateno
\newconstant\frozenpagestate
\def\dotrackpagestate#1#2%
{\ifdoublesided \ifinpagebody \else
\doforcedtrackpagestate{#1}{#2}%
\fi \fi}
\def\doforcedtrackpagestate#1#2%
{\ifcase\frozenpagestate
\global\advance\noftrackedpagestates\plusone
\global\advance#2\plusone
\lazysavetaggedtwopassdata{#1}{\number\noftrackedpagestates}{\number#2}{\noexpand\realfolio}%
%\llap{\infofont\number\noftrackedpagestates/\number#2}% tracing
\fi}
\def\doifrightpagestateelse#1#2%
{\ifcase\frozenpagestate
\pagestatemismatchfalse
\realpagestateno\realfolio
\ifinpagebody
\ifdoublesided
\ifodd\realpageno\relax
\twopassdatafoundtrue \else \twopassdatafoundfalse
\fi
\else
\twopassdatafoundtrue
\fi
\else\ifdoublesided
\findtwopassdata{#1}{\number#2}%
\iftwopassdatafound
\realpagestateno\twopassdata\relax
\ifnum\twopassdata=\realpageno \else
\pagestatemismatchtrue
\fi
\ifodd\twopassdata\relax
\twopassdatafoundtrue \else \twopassdatafoundfalse
\fi
\else
\ifodd\realpageno\relax
\twopassdatafoundtrue \else \twopassdatafoundfalse
\fi
\fi
\else
\twopassdatafoundtrue
\fi\fi
\else
\ifodd\realpagestateno\relax
\twopassdatafoundtrue \else \twopassdatafoundfalse
\fi
\fi
\iftwopassdatafound
\@EA\firstoftwoarguments
\else
\@EA\secondoftwoarguments
\fi}
\def\doifforcedrightpagestateelse#1#2%
{\ifcase\frozenpagestate
\pagestatemismatchfalse
\realpagestateno\realfolio
\findtwopassdata{#1}{\number#2}%
\iftwopassdatafound
\realpagestateno\twopassdata\relax
\ifnum\twopassdata=\realpageno \else
\pagestatemismatchtrue
\fi
\ifodd\twopassdata\relax
\twopassdatafoundtrue \else \twopassdatafoundfalse
\fi
\else
\ifodd\realpageno\relax
\twopassdatafoundtrue \else \twopassdatafoundfalse
\fi
\fi
\else
\ifodd\realpagestateno\relax
\twopassdatafoundtrue \else \twopassdatafoundfalse
\fi
\fi
\iftwopassdatafound
\@EA\firstoftwoarguments
\else
\@EA\secondoftwoarguments
\fi}
\def\freezepagestate {\frozenpagestate\plusone }
\def\defrostpagestate{\frozenpagestate\zerocount}
% we can make more of these on top, but how to deal with mixed frozen states
\definetwopasslist\s!paragraph \newcount \nofraggedparagraphs
\def\signalrightpage {\dotrackpagestate \s!paragraph\nofraggedparagraphs}
\def\doifrightpageelse{\doifrightpagestateelse\s!paragraph\nofraggedparagraphs}
\newcount\pagesignallevel
\unexpanded\def\startsignalrightpage % one may do a \postsignalrightplace
{\advance\pagesignallevel\plusone
\presignalrightpage
\let\signalrightpage\relax
\let\presignalrightpage\relax
\let\startsignalrightpage\relax
\doifrightpageelse\donothing\donothing
\freezepagestate}
\unexpanded\def\stopsignalrightpage
{\ifcase\pagesignallevel\or\postsignalrightpage\fi
\advance\pagesignallevel\minusone}
% \def\setraggedparagraphmode
% {\signalrightpage\doifrightpageelse} % move it there
\ifx\swapmargins\undefined \let\swapmargins\undefined \fi % todo
\def\doifswappedrightpageelse#1#2% alleen in box construction !
{\doifrightpageelse
{#1}
{\scratchcounter\realpageno
\realpageno\realpagestateno\relax
\swapmargins
\realpageno\scratchcounter
#2}}
\newbox\signaledrightpage % this way we can avoid interference, i.e. postpone placement
\def\presignalrightpage {\global\setbox\signaledrightpage\hbox{\signalrightpage}}
\def\postsignalrightpage{\ifvoid\signaledrightpage\else\box\signaledrightpage\fi}
% The next feature is is used in:
%
% \definenumber[test][way=bypage]
%
% \def\Test
% {\incrementnumber[test]\rawnumber[test]/%
% \incrementnumber[test]\rawnumber[test]/%
% \incrementnumber[test]\rawnumber[test]\space
% \checkpagechange{oeps}\changedpage{oeps}\space
% \ifpagechanged TRUE\else FALSE\fi}
%
% \Test\page \Test\par \Test\page \Test\par \Test\page \Test\page
%
% (adapted from cont-new.tex:)
\newif\ifpagechanged \let\lastchangedpage\empty
\def\docheckpagestatechange#1#2#3%
{\pagechangedfalse
\doforcedtrackpagestate{#2}{#3}%
\findtwopassdata{#2}{\number#3}%
\iftwopassdatafound
\ifnum\twopassdata>0\getvalue{#2:p:#1}\relax
\pagechangedtrue
\fi
\fi
\ifpagechanged
\letgvalue{#2:p:#1}\twopassdata
\globallet\lastchangedpage\twopassdata
\else
\globallet\lastchangedpage\realfolio
\fi}
\def\changedpagestate#1#2%
{\executeifdefined{#2:p:#1}{0}}
\def\checkpagechange#1{\docheckpagestatechange{#1}\s!paragraph\nofraggedparagraphs}
\def\changedpage #1{\changedpagestate{#1}\s!paragraph}
\protect \endinput
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