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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 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 Spacing Macros / Pages}
\unprotect
%D The code here has evolved over time and might not be the best
%D around. Maybe much will be gone a some point.
\installcorenamespace {alignswitch}
\letvalue{\??alignswitch\v!left }\zerocount
\letvalue{\??alignswitch\v!middle}\plusone
\letvalue{\??alignswitch\v!right }\plustwo
\def\setalignmentswitch#1%
{\chardef\alignmentswitch\csname\??alignswitch\ifcsname\??alignswitch#1\endcsname#1\else\v!left\fi\endcsname}
\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#2\plusone
\setpagestate[#1][\number#2]%
\fi}
\let\m_spac_pagestates_realpage\empty
\newconditional\c_spac_pagestates_found
\unexpanded\def\docheckpagestate#1#2%
{\ifcase\frozenpagestate
\setpagestaterealpageno{#1}{\number#2}%
\fi}
\unexpanded\def\doifelserightpagestate#1#2% not expandable !
{\ifcase\frozenpagestate
\pagestatemismatchfalse
\realpagestateno\realfolio
\ifinpagebody
\ifdoublesided
\ifodd\realpageno\relax
\settrue\c_spac_pagestates_found
\else
\setfalse\c_spac_pagestates_found
\fi
\else
\settrue\c_spac_pagestates_found
\fi
\else\ifdoublesided
\edef\m_spac_pagestates_realpage{\pagestaterealpage{#1}{\number#2}}%
\ifx\m_spac_pagestates_realpage\empty
\ifodd\realpageno\relax
\settrue\c_spac_pagestates_found
\else
\setfalse\c_spac_pagestates_found
\fi
\else
\realpagestateno\m_spac_pagestates_realpage\relax
\ifnum\realpagestateno=\realpageno \else
\pagestatemismatchtrue
\fi
\ifodd\realpagestateno\relax
\settrue\c_spac_pagestates_found
\else
\setfalse\c_spac_pagestates_found
\fi
\fi
\else
\settrue\c_spac_pagestates_found
\fi\fi
\else
\ifodd\realpagestateno\relax
\settrue\c_spac_pagestates_found
\else
\setfalse\c_spac_pagestates_found
\fi
\fi
\ifconditional\c_spac_pagestates_found
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\unexpanded\def\doifelseforcedrightpagestate#1#2%
{\ifcase\frozenpagestate
\pagestatemismatchfalse
\realpagestateno\realfolio
\edef\m_spac_pagestates_realpage{\pagestaterealpage{#1}{\number#2}}%
\ifx\m_spac_pagestates_realpage\empty
\ifodd\realpageno\relax
\settrue\c_spac_pagestates_found
\else
\setfalse\c_spac_pagestates_found
\fi
\else
\realpagestateno\m_spac_pagestates_realpage\relax
\ifnum\realpagestateno=\realpageno \else
\pagestatemismatchtrue
\fi
\ifodd\realpagestateno\relax
\settrue\c_spac_pagestates_found
\else
\setfalse\c_spac_pagestates_found
\fi
\fi
\else
\ifodd\realpagestateno\relax
\settrue\c_spac_pagestates_found
\else
\setfalse\c_spac_pagestates_found
\fi
\fi
\ifconditional\c_spac_pagestates_found
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\let\doifrightpagestateelse \doifelserightpagestate
\let\doifforcedrightpagestateelse\doifelseforcedrightpagestate
\unexpanded\def\freezepagestate {\frozenpagestate\plusone }
\unexpanded\def\defrostpagestate{\frozenpagestate\zerocount}
% we can make more of these on top, but how to deal with mixed frozen states
% \dorecurse{500}{\dontleavehmode\signalrightpage\doifrightpageelse{right}{left}\par} % given doublesided
\newcount\nofraggedparagraphs
\definepagestate[\s!paragraph]
\unexpanded\def\signalrightpage {\dotrackpagestate \s!paragraph\nofraggedparagraphs} % use \dontleavehmode if needed
\unexpanded\def\doifelserightpage{\doifelserightpagestate\s!paragraph\nofraggedparagraphs}
\let\doifrightpageelse\doifelserightpage
\installcorenamespace{pagechanges}
\newif\ifpagechanged \let\lastchangedpage\empty
\def\spac_pagechanges_check#1#2#3%
{\pagechangedfalse
\doforcedtrackpagestate{#2}{#3}%
\edef\m_spac_pagestates_realpage{\pagestaterealpage{#2}{\number#3}}%
\ifx\m_spac_pagestates_realpage\empty \else
\ifnum\m_spac_pagestates_realpage>0\getvalue{\??pagechanges#2:#1}\relax
\pagechangedtrue
\fi
\fi
\ifpagechanged
\letgvalue{\??pagechanges#2:#1}\m_spac_pagestates_realpage
\globallet\lastchangedpage\m_spac_pagestates_realpage
\else
\globallet\lastchangedpage\realfolio
\fi}
\def\changedpagestate#1#2%
{\executeifdefined{\??pagechanges#2:#1}0}
\def\checkpagechange#1{\spac_pagechanges_check{#1}\s!paragraph\nofraggedparagraphs}
\def\changedpage #1{\changedpagestate{#1}\s!paragraph}
\protect \endinput
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