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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}{autosuffix}
\unprotect
%D Synchronizing marks is a rather tricky and messy business. When setting a mark, a
%D node is added to the list in order for to \TEX\ be able to figure out the 3
%D current marks when a page is made (last mark on previous page, first on current
%D page, last on 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 one on the
%D previous page for instance. In \LUATEX\ we can clear a marks state register with
%D \type {\clearmarks} but since this is an immediate operation it might have
%D unwanted side effects when \TEX\ has collected several pages of text and
%D finishing off these pages uses marks.
%D
%D In \MKIV\ we provide an alternative model that permits some more control over the
%D way marks are used. It is not entirely compatible with \MKII\ or previous \MKIV\
%D implementations but in practice this is not a real problem. It's also easier now
%D to extend this mechanism.
%D In \LUAMETATEX\ we have extended the marks mechanism with a few handy options.
%D First of all we have automigration built in for inserts and marks (so we no
%D longer need to do that in \LUA) and marks can be properly flushed.
% \ifdefined\automigrationmode \automigrationmode0 \fi
% \starttext
% \dorecurse{10}{
% \dontleavehmode\setbox0\hbox{SAMPLE #1}\box0
% \marks\foomark{sample #1}%
% \samplefile{tufte}\par
% }%
% \stoptext
% current
% column:n | n | column | etc ... now only column:n
% default page all keep
%definesystemattribute [marks] [global]
\installcorenamespace{marking}
\installcorenamespace{markingclass}
\installcorenamespace{markingsyncs}
\installcorenamespace{markingfilter}
\installcommandhandler \??marking {marking} \??marking
\newconditional\inhibitgetmarking % will become private
\newconditional\inhibitsetmarking % will become private
\newtoks \everymarking
% \clf_definemarking{\currentmarking}{\currentmarkingparent}%
\appendtoks
\ifcsname\??markingclass\currentmarking\endcsname\else
\ifempty\currentmarkingparent
\expandafter\newmarks\csname\??markingclass\currentmarking\endcsname
\expandafter\newtoks \csname\??markingsyncs\currentmarking\endcsname
\else
\expandafter\letcsname\??markingclass\currentmarking\expandafter\endcsname\csname\??markingclass\currentmarkingparent\endcsname
\expandafter\letcsname\??markingsyncs\currentmarking\expandafter\endcsname\csname\??markingsyncs\currentmarkingparent\endcsname
\fi
\fi
\to \everydefinemarking
\permanent\protected\tolerant\def\relatemarking[#1]#*[#2]%
{\ifarguments\or\else
\xtoksapp\csname\??markingsyncs#2\endcsname{%
\flushmarks\csname\??markingclass#1\endcsname
\noexpand\the\begincsname\??markingsyncs#1\endcsname
}%
\fi}
\permanent\protected\tolerant\def\clearmarking[#1]%
{\ifarguments\else
\begingroup
\clearmarks\csname\??markingclass#1\endcsname
\enforced\let\flushmarks\clearmarks
\the\csname\??markingsyncs#1\endcsname
\endgroup
\fi}
\permanent\protected\tolerant\def\resetmarking[#1]%
{\ifarguments\else
% probably best: \dontleavehmode
\the\csname\??markingsyncs#1\endcsname
\fi}
\permanent\protected\tolerant\def\resetsynchronizemarking[#1]%
{\clf_resetsynchronizemarking{#1}}
\tolerant\def\synchronizemarking[#1]#*[#2]#*[#3]% #3: options
{\clf_synchronizemarking{#1}\plusone\numexpr#2\relax}
\def\strc_markings_synchronize#1#2#3% category n box
{\ifvoid#3\orelse\ifcstok{#1}\v!page\else
\clf_synchronizemarking{#1}\numexpr#2\relax\numexpr#3\relax
\fi}
\permanent\def\doifelsemarking#1%
{\ifcondition\ifcommandhandler\??marking{#1}%
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\permanent\protected\tolerant\def\setmarking[#1]#:#2%
{\ifarguments\orelse\ifconditional\inhibitsetmarking\else
% so no: \dontleavehmode
\the\csname\??markingsyncs#1\endcsname
\ifcstok{\namedmarkingparameter{#1}\c!expansion}\v!yes
\normalexpanded{%
\ifvmode\expandafter\flushatnextpar\else\expandafter\firstofoneargument\fi
{\marks\csname\??markingclass#1\endcsname{#2}}%
}%
\else
\ifvmode\expandafter\flushatnextpar\else\expandafter\firstofoneargument\fi
{\marks\csname\??markingclass#1\endcsname{#2}}%
\fi
\fi}
\aliased\let\marking \setmarking
\aliased\let\doifmarkingelse\doifelsemarking
% defaults
\setupmarking
[\c!expansion=\v!no,
\c!separator=\space\emdash\space,
\c!filtercommand=\firstofoneargument,
\c!state=\v!start]
% fetching, regular interface
\permanent\protected\def\getmarking
{\ifconditional\inhibitgetmarking
\expandafter\strc_markings_get_nop
\else
\expandafter\strc_markings_get_yes
\fi}
\tolerant\def\strc_markings_get_nop[#-]#*[#-]#*[#-]%
{}
\tolerant\def\strc_markings_get_yes[#1]#*[#2]#*[#3]%
{\ifarguments\orelse\ifcstok{\namedmarkingparameter{#1}\c!state}\v!start
\begingroup
\setsystemmode\v!marking
\the\everymarking
\ifparameter#3\or
\ifcstok{#2}\v!page
\markingcommand{#1}{\csname\??markingfilter#3\endcsname{#1}}%
\else
\markingcommand{#1}{\clf_getsynchronizedmarking\begincsname\??markingclass#1\endcsname{#2}{#3}}%
\fi
\orelse\ifparameter#2\or
\markingcommand{#1}{\csname\??markingfilter#2\endcsname{#1}}%
\else
\markingcommand{#1}{\csname\??markingfilter\v!default\endcsname{#1}}%
\fi
\endgroup
\fi}
% previous : last before sync next : first after sync
% top : first in sync bottom : last in sync
% first|default : first not top in sync last : last not bottom in sync
% current
\defcsname\??markingfilter\v!previous\endcsname#1{\topmarks \csname\??markingclass#1\endcsname}
\defcsname\??markingfilter\v!next \endcsname#1{\botmarks \csname\??markingclass#1\endcsname}
%defcsname\??markingfilter\v!top \endcsname#1{\topmarks \csname\??markingclass#1\endcsname}
\defcsname\??markingfilter\v!top \endcsname#1{\firstmarks \csname\??markingclass#1\endcsname}
\defcsname\??markingfilter\v!bottom \endcsname#1{\botmarks \csname\??markingclass#1\endcsname}
\defcsname\??markingfilter\v!first \endcsname#1{\firstmarks \csname\??markingclass#1\endcsname}
\defcsname\??markingfilter\v!last \endcsname#1{\botmarks \csname\??markingclass#1\endcsname}
\defcsname\??markingfilter\v!current \endcsname#1{\currentmarks\csname\??markingclass#1\endcsname}
\letcsname\??markingfilter\v!default\expandafter\endcsname
\csname\??markingfilter\v!first \endcsname
% the fetchers are fully expandable: [name][method]
\def\strc_markings_fetch_one#1#2#3%
{\ifparameter#1\or
\ifconditional\inhibitgetmarking\else
\ifcstok{#2}\v!page
\markingcommand{#1}{\begincsname\??markingfilter#3\endcsname{#1}}%
\else
\markingcommand{#1}{\clf_getsynchronizedmarking{#1}{#2}}%
\fi
\fi
\fi}
\def\strc_markings_fetch_two#1#2%
{\ifparameter#1\or
\ifconditional\inhibitgetmarking\else
\ifcstok{#2}\v!page
\markingcommand{#1}{\begincsname\??markingfilter\v!first\endcsname{#1}}%
\markingseparator{#1}%
\markingcommand{#1}{\begincsname\??markingfilter\v!last\endcsname{#1}}%
\else
\markingcommand{#1}{\clf_getsynchronizedmarking{#1}\v!first}%
\markingseparator{#1}%
\markingcommand{#1}{\clf_getsynchronizedmarking{#1}\v!last}%
\fi
\fi
\fi}
\def\strc_markings_fetch_all#1#2%
{\ifparameter#1\or
\ifconditional\inhibitgetmarking\else
\ifcstok{#2}\v!page
\markingcommand{#1}{\begincsname\??markingfilter\v!previous\endcsname{#1}}%
\markingseparator{#1}%
\markingcommand{#1}{\begincsname\??markingfilter\v!first\endcsname{#1}}%
\markingseparator{#1}%
\markingcommand{#1}{\begincsname\??markingfilter\v!last\endcsname{#1}}%
\else
%\markingcommand{#1}{\begincsname\??markclass:\v!previous\endcsname{#1}}%
%\markingseparator{#1}%
\markingcommand{#1}{\clf_getsynchronizedmarking{#1}\v!first}%
\markingseparator{#1}%
\markingcommand{#1}{\clf_getsynchronizedmarking{#1}\v!last}%
\fi
\fi
\fi}
\permanent\tolerant\def\fetchonemark [#1]#*[#2]{\strc_markings_fetch_one{#1}\v!page{#2}}
\permanent\tolerant\def\fetchtwomarks [#1]{\strc_markings_fetch_two{#1}\v!page}
\permanent\tolerant\def\fetchallmarks [#1]{\strc_markings_fetch_all{#1}\v!page}
\aliased\let\fetchmark\fetchonemark
% also fully expandable but here we have: [name][range][method]
\permanent\tolerant\def\fetchonemarking [#1]#*[#2]#*[#3]{\strc_markings_fetch_one{#1}{#2}{#3}}
\permanent\tolerant\def\fetchtwomarkings [#1]#*[#2]{\strc_markings_fetch_two{#1}{#2}}
\permanent\tolerant\def\fetchallmarkings [#1]#*[#2]{\strc_markings_fetch_all{#1}{#2}}
\aliased\let\fetchmarking\fetchonemarking
\permanent\def\markingseparator#1{\namedmarkingparameter{#1}\c!separator}
\permanent\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
|
