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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 / Hans Hagen]
%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]
\let\currentmarking\empty
\def\markingparameter #1{\csname\domarkingparameter{\??mk\currentmarking}#1\endcsname}
\def\namedmarkingparameter #1#2{\csname\domarkingparameter{\??mk#1}#2\endcsname}
\def\domarkingparameter #1#2{\ifcsname#1#2\endcsname#1#2\else\expandafter\domarkingparentparameter\csname#1\s!parent\endcsname#2\fi}
\def\domarkingparentparameter#1#2{\ifx#1\relax\s!empty\else\domarkingparameter#1#2\fi}
% \def\markingparameterhash #1{\domarkingparameterhash{\??mk\currentmarking}#1}
% \def\domarkingparameterhash #1#2{\ifcsname#1#2\endcsname#1\else\expandafter\domarkingparentparameterhash\csname#1\s!parent\endcsname#2\fi}
% \def\domarkingparentparameterhash#1#2{\ifx#1\relax\else\domarkingparameterhash#1#2\fi}
%
% \def\detokenizedmarkingparameter#1{\detokenize\expandafter\expandafter\expandafter{\csname\??mk\currentmarking#1\endcsname}}
%
% \def\dosetmarkingattributes#1#2% style color
% {\edef\fontattributehash {\markingparameterhash#1}%
% \edef\colorattributehash{\markingparameterhash#2}%
% \ifx\fontattributehash \empty\else\dosetfontattribute \fontattributehash #1\fi
% \ifx\colorattributehash\empty\else\dosetcolorattribute\colorattributehash#2\fi}
\newconditional\inhibitgetmarking
\newconditional\inhibitsetmarking
\newtoks \everymarking
\unexpanded\def\setupmarking
{\dodoubleargument\dosetupmarking}
\def\dosetupmarking[#1][#2]%
{\ifsecondargument
\def\docommand##1{\getparameters[\??mk##1][#2]}%
\processcommalist[#1]\docommand
\else
\getparameters[\??mk][#1]%
\fi}
% management
\unexpanded\def\definemarking {\dodoubleempty \dodefinemarking}
\unexpanded\def\relatemarking {\dodoubleempty \dorelatemarking}
\unexpanded\def\setmarking {\dosingleargument\dosetmarking } \let\marking\setmarking
\unexpanded\def\resetmarking {\dosingleargument\doresetmarking }
\unexpanded\def\synchronizemarking{\dodoubleargument\dosynchronizemarking }
\def\dodefinemarking[#1][#2]% marking parent
{\doifelsenothing{#2}
{\ctxcommand{definemarking("#1")}%
\getparameters[\??mk#1][\s!parent=\??mk]}
{\ctxcommand{definemarking("#1",{ parent = "#2" })}%
\getparameters[\??mk#1][\s!parent=\??mk#2]}}
\def\dorelatemarking[#1][#2]%
{\ctxcommand{relatemarking("#1","#2")}}
\def\dosetmarking[#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\doresetmarking[#1]%
{\ctxcommand{resetmarking("#1")}}
\def\doifelsemarking#1%
{\ctxcommand{doifelsemarking("#1")}}
\def\dosynchronizemarking[#1][#2]% class boxnumber (some day also name), maybe second argument table
{\ifvoid#2\else\ctxcommand{synchronizemarking("#1",\number#2)}\fi}
% \appendtoks
% \dosynchronizemarking[\v!page][\normalpagebox]%
% \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\nogetmarking
\else
\expandafter\dotripleargument\expandafter\dogetmarking
\fi}
\def\nogetmarking[#1][#2][#3]%
{}
\def\dogetmarking[#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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