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%D \module
%D [ file=core-ins,
%D version=2002.04.16,
%D title=\CONTEXT\ Insertion Macros,
%D subtitle=Insertions,
%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 Core Macros / Insertions}
%D Insertions are special data collections that are associated to \TEX's internal
%D page builder. When multiple footnote classes were introduced, I decided to
%D isolate some of the functionality in a module.
\registerctxluafile{page-ins}{1.001}
\unprotect
%D Because we need to deal with inserts at the \LUA\ end as well,
%D we provide a proper installer.
% Not yet used as we need to adapt some code to this.
\installcorenamespace{insertion}
\installcorenamespace{insertionnumber}
\installcommandhandler \??insertion {insertion} \??insertion
\setupinsertion
[%c!n=\plusone,
%c!distance=\zeropoint,
%c!maxheight=\maxdimen,
%c!factor=\plusthousand,
\c!location=\v!page]
\newcount\currentinsertionnumber % This is a count and not a macro !
\newtoks\t_page_inserts_list
\let\doprocessinsert\relax
%D Maybe some day we will move settings here.
\unexpanded\def\setcurrentinsertion#1%
{\edef\currentinsertion{#1}%
\currentinsertionnumber\csname\??insertionnumber\currentinsertion\endcsname}
\def\namedinsertionnumber#1{\csname\??insertionnumber#1\endcsname}
\unexpanded\def\page_inserts_synchronize_registers
{\currentinsertionnumber\csname\??insertionnumber\currentinsertion\endcsname}
% for practical reasone we still set these elsewhere but that might chaneg in the future
%
% \global\count\currentinsertionnumber\numexpr\insertionparameter\c!factor/\insertionparameter\c!n\relax
% \global\skip \currentinsertionnumber\insertionparameter\c!distance \relax
% \global\dimen\currentinsertionnumber\insertionparameter\c!maxheight\relax}
\appendtoks
\page_inserts_synchronize_registers
\to \everysetupinsertion
\unexpanded\def\page_inserts_process#1% beware, this addapts currentinsertion !
{\edef\currentinsertion{#1}%
\currentinsertionnumber\csname\??insertionnumber\currentinsertion\endcsname
\doprocessinsert\currentinsertionnumber} % old method
\unexpanded\def\processinsertions
{\the\t_page_inserts_list}
\unexpanded\def\synchronizeinsertions
{\let\doprocessinsert\page_inserts_synchronize
\processinsertions}
\unexpanded\def\page_inserts_synchronize#1% yes or no
{\ifvoid#1\else
\insert#1{\unvbox#1}%
\fi}
\unexpanded\def\doifelseinsertion#1%
{\ifcsname\??insertionnumber#1\endcsname
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\let\doifinsertionelse\doifelseinsertion
% \unexpanded\def\startinsertion[#1]%
% {\insert\csname\??insertionnumber#1\endcsname\bgroup}
%
% \unexpanded\def\stopinsertion
% {\egroup}
% For the moment we use the regular insertion allocator so that users can
% still define their own insertions (not that they will play nicely with
% all context mechanisms then). We can use the dimensions at the \LUA\ end
% so we don't need to pass pass them explicitly. Actually, when we see an
% insertion node at that end, we already know the number.
\appendtoks
\ifx\currentinsertionparent\empty
\ifcsname\??insertionnumber\currentinsertion\endcsname
% bad news
\else
\expandafter\newinsert\csname\??insertionnumber\currentinsertion\endcsname
\page_inserts_synchronize_registers
\clf_defineinsertion
{\currentinsertion}%
{%
number \currentinsertionnumber
}%
\relax
\t_page_inserts_list\expandafter\expandafter\expandafter
{\expandafter\the\expandafter\t_page_inserts_list
\expandafter\page_inserts_process\csname\??insertionnumber\currentinsertion\endcsname}%
\count\currentinsertionnumber\plusthousand
\skip \currentinsertionnumber\zeropoint
\dimen\currentinsertionnumber\maxdimen
\fi
\else
\expandafter\let\csname\??insertionnumber\currentinsertion\expandafter\endcsname
\csname\??insertionnumber\currentinsertionparent\endcsname
\fi
\to \everydefineinsertion
\appendtoks
\clf_setupinsertion
{\currentinsertion}
{%
location {\insertionparameter\c!location}%
}%
\relax
\to \everysetupinsertion
\unexpanded\def\page_inserts_set_location#1#2% fast one
{\clf_setinsertionlocation{#1}{#2}}
%D Auxiliary macros:
\def\page_insert_insertion_height#1%
{\dimexpr\expandafter\page_insert_insertion_height_indeed\csname\??insertionnumber#1\endcsname\relax}
\def\page_insert_insertion_height_indeed#1%
{\ifvoid#1\zeropoint\else1\skip#1+\ht#1\fi}
%D Obsolete:
% \installcorenamespace{insertionbackup}
%
% \unexpanded\def\installbackupinsertion#1%
% {\ifcsname\??insertionbackup\string#1\endcsname \else
% \expandafter\newinsert\csname\??insertionbackup\string#1\endcsname
% \count\csname\??insertionbackup\string#1\endcsname\zerocount
% \skip \csname\??insertionbackup\string#1\endcsname\zeropoint
% \dimen\csname\??insertionbackup\string#1\endcsname\maxdimen
% \fi}
%
% \unexpanded\def\saveinsertionbox#1% hm, actually unknown
% {\global\setbox\csname\??insertionbackup\string#1\endcsname
% \ifdim\ht#1>\zeropoint\box#1\else\emptybox\fi}
%
% \unexpanded\def\restoreinsertionbox#1%
% {\ifvoid\backupinsertion#1\else % if void, we keep the content
% \global\setbox#1\box\csname\??insertionbackup\string#1\endcsname
% \fi}
%
% \unexpanded\def\eraseinsertionbackup#1%
% {\global\setbox\csname\??insertionbackup\string#1\endcsname\emptybox}
%
% \unexpanded\def\saveinsertiondata#1%
% {\global\skip \csname\??insertionbackup\string#1\endcsname\skip #1%
% \global\count\csname\??insertionbackup\string#1\endcsname\count#1%
% \global\dimen\csname\??insertionbackup\string#1\endcsname\dimen#1}
%
% \unexpanded\def\restoreinsertiondata#1%
% {\global\skip #1\skip \csname\??insertionbackup\string#1\endcsname
% \global\count#1\count\csname\??insertionbackup\string#1\endcsname
% \global\dimen#1\dimen\csname\??insertionbackup\string#1\endcsname}
\protect \endinput
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