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%D \module
%D [ file=strc-mar,
%D version=2008.10.20,
%D title=\CONTEXT\ Structure Macros,
%D subtitle=Markings,
%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 Structure Macros / Markings}
\registerctxluafile{strc-mar}{1.001}
\unprotect
%D Synchronizing marks is a rather tricky and messy business. When
%D setting a mark, a node is added to the list in order for to \TEX\
%D be able to figure out the 3 current marks when a page is made
%D (last mark on previous page, first on current page, last on
%D current page; in \LUATEX\ we might at one point have the first on
%D the next page as well).
%D
%D Resetting a mark is not easy. An empty one will not erase the last
%D one on the previous page for instance. In \LUATEX\ we can clear a
%D marks state register with \type {\clearmarks} but since this is an
%D immediate operation it might have unwanted side effects when \TEX\
%D has collected several pages of text and finishing off these pages
%D uses marks.
%D
%D In \MKIV\ we provide an alternative model that permits some more
%D control over the way marks are used. It is not entirely compatible
%D with \MKII\ or previous \MKIV\ implementations but in practice this
%D is not a real problem. It's also easier now to extend this mechanism.
% if global has side effects we will need to nil it selectively
% and optionally enable it in for instance postponed content
\definesystemattribute [marks] [global]
\installcorenamespace{marking}
\installcommandhandler \??marking {marking} \??marking
\newconditional\inhibitgetmarking % will become private
\newconditional\inhibitsetmarking % will become private
\newtoks \everymarking
\unexpanded\def\relatemarking {\dodoubleempty \strc_markings_relate }
\unexpanded\def\setmarking {\dosingleargument\strc_markings_set } \let\marking\setmarking
\unexpanded\def\resetmarking {\dosingleargument\strc_markings_reset }
\unexpanded\def\synchronizemarking{\dotripleargument\strc_markings_synchronize}
\appendtoks
\ctxcommand{definemarking("\currentmarking",{ parent = "\currentmarkingparent" })}%
\to \everydefinemarking
\def\strc_markings_relate[#1][#2]%
{\ctxcommand{relatemarking("#1","#2")}}
\def\strc_markings_set[#1]#2%
{\ifconditional\inhibitsetmarking
% nothing
\else
\doifelse{\namedmarkingparameter{#1}\c!expansion}\v!yes
{\ctxcommand{setmarking("#1",\!!bs#2\!!es)}}
{\ctxcommand{setmarking("#1",\!!bs\detokenize{#2}\!!es)}}%
\fi}
\def\strc_markings_reset[#1]%
{\ctxcommand{resetmarking("#1")}}
\def\strc_markings_synchronize[#1][#2][#3]% #1=class #2=boxnumber (some day also name) #3=options, maybe second argument table
{\ifvoid#2\else\ctxcommand{synchronizemarking("#1",\number#2,"#3")}\fi}
% \def\doifelsemarking#1% why no \unexpanded
% {\ctxcommand{doifelsemarking("#1")}}
% \def\doifelsemarking#1%
% {\normalexpanded{\noexpand\ctxcommand{doifelsemarking("\noexpand\detokenize{#1}")}}}
\def\doifelsemarking#1%
{\ctxcommand{doifelsemarking(\!!bs#1\!!es)}}
% \appendtoks
% \strc_markings_synchronize[\v!page][\normalpagebox][\v!keep]% keep if no marks
% \to \everybeforepagebody
% defaults
\setupmarking
[\c!expansion=\v!no,
\c!separator=\space\emdash\space,
\c!filtercommand=\firstofoneargument,
\c!state=\v!start]
% fetching, regular interface
\unexpanded\def\getmarking
{\ifconditional\inhibitgetmarking
\expandafter\dotripleargument\expandafter\strc_markings_get_nop
\else
\expandafter\dotripleargument\expandafter\strc_markings_get_yes
\fi}
\def\strc_markings_get_nop[#1][#2][#3]%
{}
\def\strc_markings_get_yes[#1][#2][#3]%
{\doif{\namedmarkingparameter{#1}\c!state}\v!start
{\begingroup
\setsystemmode\v!marking
\the\everymarking
\ifthirdargument
\ctxcommand{getmarking("#1","#2","#3")}%
\else
\ctxcommand{getmarking("#1","\v!page","#2")}%
\fi
\endgroup}}
% the fetchers are fully expandable: [name][method]
\def\fetchonemark[#1]#2[#3]{\ifconditional\inhibitgetmarking\else\ctxcommand{fetchonemark ("#1","\v!page","#2")}\fi}
\def\fetchtwomarks [#1]{\ifconditional\inhibitgetmarking\else\ctxcommand{fetchtwomarks("#1","\v!page")}\fi}
\def\fetchallmarks [#1]{\ifconditional\inhibitgetmarking\else\ctxcommand{fetchallmarks("#1","\v!page")}\fi}
\let\fetchmark\fetchonemark
% also fully expandable but here we have: [name][range][method]
\def\fetchonemarking[#1]#2[#3]#4[#5]{\ifconditional\inhibitgetmarking\else\ctxcommand{fetchonemark ("#1","#3","#5")}\fi}
\def\fetchtwomarkings [#1]#2[#3]{\ifconditional\inhibitgetmarking\else\ctxcommand{fetchtwomarks("#1","#3")}\fi}
\def\fetchallmarkings [#1]#2[#3]{\ifconditional\inhibitgetmarking\else\ctxcommand{fetchallmarks("#1","#3")}\fi}
\let\fetchmarking\fetchonemarking
\def\markingseparator#1{\namedmarkingparameter{#1}\c!separator}
\def\markingcommand #1{\namedmarkingparameter{#1}\c!filtercommand}
%D Experimental:
%D
%D \starttyping
%D \definemarking[boxmark]
%D
%D \setbox0\ruledvbox{
%D \marking[boxmark]{tufte} \input tufte \par
%D \marking[boxmark]{ward} \input ward \par
%D }
%D
%D \synchronizemarking[zerobox][0] \box0
%D
%D marks: (\getmarking[boxmark][zerobox][first],\getmarking[boxmark][zerobox][last])
%D \stoptyping
\protect \endinput
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