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%D \module
%D [ file=spac-par,
%D version=2009.10.16, % 1997.03.31, was core-spa.tex
%D title=\CONTEXT\ Spacing Macros,
%D subtitle=Paragraphs,
%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 / Paragraphs}
\unprotect
%D The dreadful sequence \type {\bgroup} \unknown\
%D \type {\carryoverpar} \unknown\ \type {\egroup} is needed
%D when for instance sidefloats are used in combination with
%D something that starts with a group. This is because
%D otherwise the indentation as set (by the output routine)
%D inside the group are forgotten afterwards. (I must
%D not forget its existence).
\global\let\carriedoverpar\relax
\def\carryoverpar#1%
{\normalexpanded % \scratchtoks{#1}%
{\noexpand#1% \the\scratchtoks
\hangindent\the\hangindent
\hangafter \the\hangafter
\parskip \the\parskip
\leftskip \the\leftskip
\rightskip \the\rightskip}}
\newconditional \parbasedattributes
\def\finishparbasedattributes
{\ifconditional\parbasedattributes
\setfalse\parbasedattributes
\par
\fi}
\def\dostopparbasedattributes
{\settrue\parbasedattributes
\dostopattributes}
% beware, changing this will break some code (like pos/backgrounds)
\newtoks\everyfirstparagraphintro
\newtoks\everynextparagraphintro
\newtoks\@@everyparagraphtoks
\chardef\everyparagraphintro\zerocount
\unexpanded\def\setupparagraphintro
{\dodoubleempty\dosetupparagraphintro}
\def\dosetupparagraphintro[#1][#2]%
{\processallactionsinset
[#1]
[ \v!reset=>\global\chardef\everyparagraphintro\zerocount
\global\everyfirstparagraphintro\emptytoks
\global\everynextparagraphintro \emptytoks,
\v!first=>\global\chardef\everyparagraphintro\plusone
\doglobal\appendtoks#2\to\everyfirstparagraphintro,
\v!next=>\ifcase\everyparagraphintro\global\chardef\everyparagraphintro\plusone\fi
\doglobal\appendtoks#2\to\everynextparagraphintro,
\v!each=>\ifcase\everyparagraphintro\global\chardef\everyparagraphintro\plustwo\fi
\doglobal\appendtoks#2\to\everyfirstparagraphintro
\doglobal\appendtoks#2\to\everynextparagraphintro]}
%D We can say:
%D
%D \starttyping
%D \setupparagraphintro[first][\index{Knuth}]
%D \stoptyping
%D
%D Maybe more convenient is:
%D
%D \starttyping
%D \flushatparagraph{\index{Zapf}}
%D \stoptyping
\def\flushatparagraph#1%
{\global\chardef\everyparagraphintro\plusone
\global\appendtoks{#1}\to\everyfirstparagraphintro
\global\let\insertparagraphintro\doinsertparagraphintro}
\def\doinsertparagraphintro % can be merged with the next
{\ifcase\everyparagraphintro\else\@EA\dodoinsertparagraphintro\fi}
\def\dodoinsertparagraphintro
{\begingroup
\everypar\emptytoks
\ifcase\everyparagraphintro\relax
% no data
\@@everyparagraphtoks\emptytoks
\or
% first data
\global\chardef\everyparagraphintro\plustwo
\@@everyparagraphtoks\everyfirstparagraphintro
\global\everyfirstparagraphintro\emptytoks
\or
% next data
\@@everyparagraphtoks\everynextparagraphintro
\fi
\the\@@everyparagraphtoks
\global\let\insertparagraphintro\relax
\endgroup}
\let\insertparagraphintro\relax
%D \starttyping
%D \setupparagraphintro[first][\hbox to 3.5em{\tt FIRST \hss}]
%D \setupparagraphintro[first][\hbox to 3.5em{\tt TSRIF \hss}]
%D \setupparagraphintro[next] [\hbox to 3.5em{\tt NEXT \hss}]
%D \setupparagraphintro[next] [\hbox to 3.5em{\tt TXEN \hss}]
%D \setupparagraphintro[each] [\hbox to 3.0em{\tt EACH \hss}]
%D \setupparagraphintro[each] [\hbox to 3.0em{\tt HCEA \hss}]
%D
%D some paragraph \par
%D some paragraph \par
%D some paragraph \par
%D
%D \definelabel[parnumber]
%D
%D \setupparagraphintro[reset,each][\inleft{\slxx\parnumber}]
%D
%D some paragraph \par
%D some paragraph \par
%D some paragraph \par
%D \stoptyping
%D \macros
%D {flushatnextpar}
%D
%D This macro collects data that will be flushed at the next paragraph.
%D By using this macro you can avoid interfering nodes (writes, etc).
\newbox\postponednodedata
\let\flushpostponednodedata\relax
\def\flushatnextpar
{\bgroup
\global\let\flushpostponednodedata\doflushpostponednodedata
\dowithnextbox{\global\setbox\postponednodedata\hbox{\box\postponednodedata\box\nextbox}\egroup}\hbox}
\def\doflushpostponednodedata
{\ifvoid\postponednodedata\else
\hbox{\smashedbox\postponednodedata}%
\fi
\global\let\flushpostponednodedata\relax}
% Very nasty but needed for margin stuff inside colored
% paragraphs.
\let\normalvadjust\vadjust
\def\graphicvadjust % nasty bidi handling
{\dowithnextboxcontent
{\forgetall}
{\vadjust{\vbox attr \graphicvadjustattribute \plusone
{\unvbox\nextbox
% corrects for one line paragraphs
\nointerlineskip
\kern-\struttotal
\nointerlineskip
\verticalstrut}}}%
\vbox}
%D This works only in a properly strutted line, and is meant
%D for deeply burried operations, like in heads.
\def\fakedvadjust
{\dowithnextbox
{\setbox\nextbox\hbox{\llap{\lower\strutdepth\box\nextbox}}%
\smashedbox\nextbox}%
\vtop}
\def\localvbox#1#% used?
{\vbox#1\bgroup
\forgetparskip
\setlocalhsize
\hsize\localhsize
\forgetparindent
\forgetbothskips
\forgeteverypar
\let\next=}
\protect \endinput
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