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+%D \module
+%D [ file=page-mar, % moved here from main-001
+%D version=1997.03.31,
+%D title=\CONTEXT\ Core Macros,
+%D subtitle=Marginal Things
+%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.
+
+%D Support for margin words is one of the reasons for writing
+%D \CONTEXT. Over time support for marginal content has been
+%D extended en enhanced. Therefore it's always good to watch
+%D out for unexpected side effects.
+
+\writestatus{loading}{Context Core Macros / Maginal Things}
+
+\unprotect
+
+%D There are three categories and their historically grown meaning is
+%D as follows:
+%D
+%D marginlines: these are flushed relative to the start of a line and
+%D need to be invoked there.
+%D
+%D marginwords: these can be issued in the text flow and will migrate
+%D sidewards; in spite of the name, it can be a paragraph of text as
+%D well, but normally it's words.
+%D
+%D margintexts: these can be set beforehand and are flushed at the
+%D next paragraph of text (of header)
+%D
+%D While these mechanisms were rather separated, they now are slightly
+%D more integrated. Instead of low level instances we now have a mechanism
+%D for defining additional ones.
+
+%D \macros
+%D {inleftedge,inleftmargin,inrightmargin,inrightedge}
+%D
+%D The fast and clean way of putting things in the margin is
+%D using \type{\rlap} or \type{\llap}. Unfortunately these
+%D macro's don't handle indentation, left and right skips. We
+%D therefore embed them in some macro's that (force and)
+%D remove the indentation and restore it afterwards.
+
+\def\definemarginline
+ {\dodoubleargument\dodefinemarginline}
+
+\def\dodefinemarginline[#1][#2]%
+ {\getparameters
+ [\??im\??im#1]
+ [\c!location=\v!left,
+ \c!distance=\zeropoint,
+ \c!width=\leftmarginwidth,
+ \c!hoffset=\leftmargindistance,
+ \c!command=,
+ #2]%
+ \setvalue{#1}{\domarginline{#1}}}
+
+\def\domarginline#1% #2
+ {\getvalue{\s!do\??im\??im\executeifdefined{\??im\??im#1\c!location}\v!left}{#1}} % {#2}
+
+\def\doleftmarginline#1#2%
+ {\pushindentation
+ \llap
+ {\postsignalrightpage
+ \hsize\getvalue{\??im\??im#1\c!width}\relax
+ \executeifdefined{\??im\??im#1\c!command}\firstofoneargument{#2}\relax
+ \hskip\leftskip
+ \hskip\getvalue{\??im\??im#1\c!hoffset }\relax
+ \hskip\getvalue{\??im\??im#1\c!distance}}%
+ \popindentation
+ \ignorespaces}
+
+\def\dorightmarginline#1#2%
+ {\pushindentation
+ \rlap
+ {\postsignalrightpage
+ \hskip\hsize
+ \hskip-\rightskip
+ \hskip\getvalue{\??im\??im#1\c!hoffset }\relax
+ \hskip\getvalue{\??im\??im#1\c!distance}\relax
+ \hsize\getvalue{\??im\??im#1\c!width }\relax
+ \executeifdefined{\??im\??im#1\c!command}\firstofoneargument{#2}}%
+ \popindentation
+ \ignorespaces}
+
+\setvalue{\s!do\??im\??im\v!left }{\doleftmarginline}
+\setvalue{\s!do\??im\??im\v!right}{\dorightmarginline}
+\setvalue{\s!do\??im\??im\v!inner}{\presignalrightpage\doifrightpageelse\doleftmarginline \dorightmarginline}
+\setvalue{\s!do\??im\??im\v!outer}{\presignalrightpage\doifrightpageelse\dorightmarginline\doleftmarginline }
+
+\definemarginline[inleftmargin] [\c!location=\v!left, \c!width=\leftmarginwidth, \c!distance=\leftmargindistance]
+\definemarginline[inrightmargin][\c!location=\v!right,\c!width=\rightmarginwidth,\c!distance=\rightmargindistance]
+\definemarginline[inleftedge] [\c!location=\v!left, \c!width=\leftedgewidth, \c!distance=\leftedgedistance, \c!hoffset=\leftmargintotal]
+\definemarginline[inrightedge] [\c!location=\v!right,\c!width=\rightedgewidth, \c!distance=\rightedgedistance,\c!hoffset=\rightmargintotal]
+
+\definemarginline[inoutermargin][\c!location=\v!outer,\c!width=\outermarginwidth,\c!distance=\outermargindistance]
+\definemarginline[ininnermargin][\c!location=\v!inner,\c!width=\innermarginwidth,\c!distance=\innermargindistance]
+\definemarginline[inouteredge] [\c!location=\v!outer,\c!width=\outeredgewidth, \c!distance=\outeredgedistance,\c!hoffset=\outermargintotal]
+\definemarginline[ininneredge] [\c!location=\v!inner,\c!width=\inneredgewidth, \c!distance=\inneredgedistance,\c!hoffset=\innermargintotal]
+
+\definemarginline[atleftmargin] [\c!location=\v!left, \c!command=\lrlap,\c!width=\zeropoint,\c!distance=\zeropoint,\c!hoffset=\zeropoint]
+\definemarginline[atrightmargin][\c!location=\v!right,\c!command=\rllap,\c!width=\zeropoint,\c!distance=\zeropoint,\c!hoffset=\zeropoint]
+
+\ifx\lrlap\undefined \def\lrlap#1{\llap{\rlap{#1}}} \fi
+\ifx\rllap\undefined \def\rllap#1{\rlap{\llap{#1}}} \fi
+
+\def\lrlap#1{\llap{\rlap{#1}}}
+\def\rllap#1{\rlap{\hskip\hsize\llap{#1}}}
+
+%D We want to keep things efficient and therefore only handle
+%D situations like:
+%D
+%D \startbuffer
+%D \inleftedge {fine} some text \par
+%D \strut \inleftmargin {fine} some text \par
+%D \noindent \inrightmargin {fine} some text \par
+%D \noindent \strut \inrightedge {fine} some text \par
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D which looks like:
+%D
+%D \bgroup
+%D \getbuffer
+%D \parindent 30pt
+%D \getbuffer
+%D \egroup
+%D
+%D A torture test:
+%D
+%D \starttyping
+%D \def\TestLine#1#2{\backgroundline[#1]{\strut\white\tttf#2~\recurselevel}}
+%D
+%D \startbuffer
+%D \inleftmargin {\TestLine{red} {lm}} test test test \par
+%D \inrightmargin{\TestLine{green} {rm}} test test test \par
+%D \inleftedge {\TestLine{red} {le}} test test test \par
+%D \inrightedge {\TestLine{green} {re}} test test test \par
+%D \inoutermargin{\TestLine{blue} {om}} test test test \par
+%D \ininnermargin{\TestLine{yellow}{im}} test test test \par
+%D \inouteredge {\TestLine{blue} {oe}} test test test \par
+%D \ininneredge {\TestLine{yellow}{ie}} test test test \par
+%D \atleftmargin {\TestLine{red} {alm}} \hfill test \par
+%D \atrightmargin{\TestLine{green} {arm}} test \hfill \par
+%D \stopbuffer
+%D
+%D \dorecurse{40}\getbuffer \page
+%D \stoptyping
+
+%D New, yet undocumented:
+%D
+%D used for pascal:
+%D
+%D \starttyping
+%D \index {test} test \index {west} west \index {rest} rest
+%D
+%D \startnarrower
+%D \placeregister[index][alternative=b,command=\atleftmargin]
+%D \stopnarrower
+%D \stoptyping
+
+% todo: compensate distance when setuplayout[textwidth=..]
+% todo: generalize margin/edge model, now too much duplication
+
+%D The next bunch of macros looks messy which is due to its
+%D multi-purpose character.
+
+\chardef\margincontentdisplacement \zerocount
+\let \margincontentdistance \!!zeropoint
+\let \margincontenthoffset \!!zeropoint
+\def \margincontentlines {1}
+\def \margincontenttag {0}
+\let \margincontentseparator \empty
+\def \margincontentstrutheight {\strutht}
+
+\newcounter\margincontentlevel
+\newdimen \margincontentheight
+
+\def\setupinmargin
+ {\dodoubleempty\dosetupinmargin}
+
+\def\dosetupinmargin[#1][#2]%
+ {\ifsecondargument
+ \processcommalist[#1]{\dodosetupinmargin[#2]}% becomes [#2]{##1}
+ \else
+ \getparameters[\??im][#1]%
+ \fi}
+
+\def\dodosetupinmargin[#1]#2% [settings]{class}
+ {\checkinmargin[#2]%
+ \getparameters[\??im#2][#1]}
+
+\def\checkinmargin[#1]%
+ {\ifundefined{\??im#1\c!offset}% this offset is related to framed !
+ \addtocommalist{#1}\inmargintaglist
+ \presetmargintext[#1]%
+ \fi}
+
+\def\presetmargintext[#1]%
+ {\presetlocalframed
+ [\??im#1]%
+ \getparameters
+ [\??im#1]
+ [\c!frame=\v!off,
+ \c!offset=\v!overlay,
+ \c!line=1,
+ \c!separator=,
+ \c!width=\v!broad,
+ \c!distance=, % empty = signal
+ \c!hoffset=\zeropoint,
+ \c!style=\@@imstyle,
+ \c!color=\@@imcolor,
+ \c!strut=\@@imstrut,
+ \c!location=\@@imlocation,
+ \c!align=\@@imalign,
+ \c!before=\@@imbefore,
+ \c!after=\@@imafter]}
+
+\newdimen\naturalmargincontentheight
+
+\def\makemargintextblock#1#2#3% width l r content
+ {\bgroup
+ \forgetall % added, else problems with 'center' and nested itemize
+ \dontcomplain
+ \hsize\getvalue{\??im#1\c!width}\relax
+ \doifnumberelse\margincontenttag
+ {\ifcase\margincontenttag\relax
+ \edef\margincontenttag{#1}% first one is setups id as well
+ \fi}
+ \donothing
+ \doifnumberelse\margincontenttag
+ {\ifnum\margincontenttag>25 % to be translated
+ \writestatus\m!systems{potential margin stack overflow (\margincontenttag)}%
+ \fi}
+ \donothing
+ % we need to preserve {a,b,c} kind of settings
+ \let\margincontentalign#1%
+ \processallactionsinset
+ [\getvalue{\??im\margincontenttag\c!align}]
+ [ \v!yes=>\let\margincontentalign#1,
+ \v!no=>\let\margincontentalign\v!normal,
+ \v!inner=>\let\margincontentalign#1,
+ \v!outer=>\let\margincontentalign#2,
+ \v!left=>\let\margincontentalign\v!left,
+ \v!middle=>\let\margincontentalign\v!middle,
+ \v!right=>\let\margincontentalign\v!right]%
+ \doifvaluesomething{\??im\margincontenttag\c!align} % watch {} around set
+ {\edef\margincontentalign{{\getvalue{\??im\margincontenttag\c!align},\margincontentalign}}}%
+ %
+ \expanded{\getparameters[\??im\margincontenttag][\c!align=\margincontentalign]}%
+ %
+ \edef\margincontentstrut{\getvalue{\??im\margincontenttag\c!strut}}%
+ \savestrut %
+ \setbox\scratchbox\vbox\localframed
+ [\??im\margincontenttag]
+ [\c!strut=\v!no,\c!offset=\v!overlay] % strut handled internally
+ {\decrement\margincontentlines
+ \dorecurse\margincontentlines{\savedstrut\endgraf\nointerlineskip}% ! savedstrut
+ \@@imbefore
+ \dostartattributes{\??im\margincontenttag}\c!style\c!color\empty
+ \dosetupstrut[\margincontentstrut]% was: \setstrut % yes or no
+ \begstrut#3\endstrut\endgraf
+ \xdef\margincontentstrutheight{\the\strutht}% so that it's known outside the framed
+ \dostopattributes
+ \@@imafter}%
+ \global \naturalmargincontentheight\ht\scratchbox
+ \global\advance\naturalmargincontentheight\dp\scratchbox
+ \doif\@@imstack\v!yes
+ {\def\overlappingmargin{-20\scaledpoint}% test value, maybe .25\strutboxdp, maybe configurable
+ \setbox\scratchbox\vbox{\stackeddown\vbox{\box\scratchbox}}}% new
+ \ht\scratchbox\strutht
+ \dp\scratchbox\strutdp % nieuw
+ \box\scratchbox
+ \egroup}
+
+%D The stacker permits constructs like:
+%D
+%D \starttyping
+%D \setupinmargin[stack=yes]
+%D
+%D \inleft{test 1}test\break
+%D \inleft{test 2}test\break
+%D \inleft{test 1}
+%D \input tufte
+%D \inleft{test 1}
+%D \inleft{test 2}
+%D \inleft{test 3}
+%D \input tufte
+%D \inleft{test 1}
+%D \inleft{test 2\endgraf test 3}
+%D \inleft{test 4}
+%D \input tufte
+%D \inleft{test 1}
+%D \inleft{test 2\endgraf test 3}
+%D \inleft{test 4\endgraf test 5\endgraf test 6}
+%D \inleft{test 7\endgraf test 8\endgraf test 9}
+%D \input tufte
+%D \stoptyping
+
+%D This approach permits us to implement a better mechanism
+%D later. We need the \type {\graphicvadjust} in order to
+%D handle:
+%D
+%D \starttyping
+%D \inleft{test} {\red \dorecurse{40}{test }\par}
+%D {\red \inleft{test} \dorecurse{40}{test }\par}
+%D \stoptyping
+%D
+%D The outer margin color is either black or color set as
+%D main text color.
+
+\newif\ifrightmargin % documenteren
+
+\ifx\dopositionmarginbox\undefined
+ \def\dopositionmarginbox#1{\graphicvadjust{\box#1}}
+\fi
+
+% watch out, margin dimensions are swapped locally (\swapmargins)
+
+% with \margincontentmethod one can control pagebreaks
+%
+% 0 no break
+% 1 each entry is one line
+% 2 only natural height
+% 3 also stack height
+
+\chardef\margincontentmethod \plusthree % beware: 1 = old method
+\chardef\marginpagecheckmethod\plusone
+
+\def\margincontentextralines{1} % old method, play safe
+\def\nofmargincontentlines {0}
+
+\def\doplacemargintext#1#2#3#4%
+ {\dontcomplain
+ \strut
+ \doifsomething{#1}
+ {\def\margincontenttag{#1}}%
+ \doifinsetelse{\margincontenttag}{\v!left,\v!right} % ugly hack
+ {\let \margincontentdistance \empty % signal
+ \let \margincontenthoffset \zeropoint}
+ {\edef\margincontentdistance{\executeifdefined{\??im\margincontenttag\c!distance }\empty }% signal
+ \edef\margincontenthoffset {\executeifdefined{\??im\margincontenttag\c!hoffset }\zeropoint}}%
+ \edef\margincontentlines {\executeifdefined{\??im\margincontenttag\c!line }\plusone }%
+ \edef\margincontentseparator {\executeifdefined{\??im\margincontenttag\c!separator}\donothing}%
+ \setbox\scratchbox\hbox{#4}% % todo: make sure that color stack works
+ \ifcase\margincontentmethod
+ \scratchdimen\zeropoint
+ \or % old method
+ \scratchdimen\ht\scratchbox
+ \advance\scratchdimen\dp\scratchbox
+ \or
+ \scratchdimen\naturalmargincontentheight
+ \or
+ \scratchdimen\naturalmargincontentheight
+ \ifx\laststackvmove\undefined\else\global\advance\scratchdimen\laststackvmove\fi
+ \fi
+ \ifdim\scratchdimen>\margincontentheight
+ \global\margincontentheight\scratchdimen
+ \fi
+ \setbox\scratchbox\hbox
+ {#2{\hskip#3\strut
+ \ifcase\margincontentdisplacement
+ % normal, move strutheight up
+ \scratchdimen\strutdp
+ \advance\scratchdimen \margincontentstrutheight
+ \advance\scratchdimen -\strutht
+ \raise\scratchdimen
+ \or
+ % low, obey vadjust
+ \fi
+ \box\scratchbox}}%
+ \ht\scratchbox\zeropoint
+ \dp\scratchbox\zeropoint
+ \gdef\margincontentstrutheight{\the\strutht}%
+ %\graphicvadjust{\box\scratchbox}} % fails in high math lines, let it be
+ %\hbox{\lower\strutdp\box\scratchbox}} % alas, wrong lapping, therefore useless
+ \dopositionmarginbox\scratchbox}
+
+\def\domarginblockskip#1%
+ {\hskip\margincontenthoffset
+ \doifelsenothing\margincontentdistance
+ {\hskip\getvalue{\??im#1\c!distance}}
+ {\hskip\margincontentdistance}%
+ \relax}
+
+\def\doleftmarginblock#1#2%
+ {\doplacemargintext{#1}\llap\zeropoint
+ {\llap{\placemargincontentseparator}%
+ \makemargintextblock\v!left\v!right{#2}%
+ \domarginblockskip\v!left}}
+
+\def\dorightmarginblock#1#2%
+ {\doplacemargintext{#1}\rlap\hsize
+ {\hskip\textwidth\hskip-\hsize % new: hsize correction
+ \domarginblockskip\v!right
+ \makemargintextblock\v!right\v!left{#2}%
+ \rlap{\placemargincontentseparator}}}
+
+\def\placemargincontentseparator
+ {\ifnum\margincontentlevel>\zerocount
+ \ifx\margincontentseparator\empty\else
+ \bgroup
+ \scratchdimen\margincontentlines\lineheight
+ \advance\scratchdimen -\lineheight
+ \lower\scratchdimen\hbox{\margincontentseparator}%
+ \egroup
+ \fi
+ \fi}
+
+\newbox\marginconstructbox
+
+\def\doinmarginswapped#1#2#3#4%
+ {\iffirstsidefloatparagraph\nowhitespace\fi % zo laat mogelijk
+ \setbox\marginconstructbox\hbox\bgroup % prevents page break in the middle of construction
+ \startsignalrightpage
+ \doifswappedrightpageelse
+ {\rightmargintrue #2}
+ {\rightmarginfalse#1}
+ {#3}% setups
+ {#4}% content
+ \stopsignalrightpage
+ \egroup
+ \unhbox\marginconstructbox}
+
+% history made this a bit complicated, the +/- was needed before
+% we had enough mem/hash to do the page correction
+
+\edef\inmargintaglist{+,-,\v!low,\v!left,\v!right,\v!inner,\v!outer}
+
+% the old one:
+%
+% \def\doinmargin[#1][#2][#3][#4][#5]% #6 #7
+% {\doifcommonelse{+,-,\v!laag}{#4}
+% {\dodoinmargin[#1][#2][#3][#4][#5]}
+% {\dodoinmargin[#1][#2][#3][][#4]}}
+%
+% an alternative:
+%
+% \letvalue{\??im\v!laag\c!offset}\empty
+% \letvalue{\??im +\c!offset}\empty
+% \letvalue{\??im -\c!offset}\empty
+%
+% \def\doinmargin[#1][#2][#3][#4][#5]% #6 #7
+% {\doifnumberelse{#4}
+% {\dodoinmargin[#1][#2][#3][#4][#5]}
+% {\doifdefinedelse{\??im#4\c!offset}
+% {\dodoinmargin[#1][#2][#3][#4][#5]}
+% {\dodoinmargin[#1][#2][#3][][#4]}}}
+%
+% the problem is that we need to keep downward compatibility
+% with respect to the first argument thing a reference or a
+% directive; the alternative is to force users to pass a
+% directive along with a reference; anyhow, as long as one
+% does not use references that have the same name as a
+% directive we can use the (slow) alternative
+
+\def\doinmargin[#1][#2][#3][#4][#5]% #6 #7
+ {\expanded{\doifinsetelse{#4}{\inmargintaglist}}
+ {\dodoinmargin[#1][#2][#3][#4][#5]}
+ {\dodoinmargin[#1][#2][#3][][#4]}}
+
+\def\defineinmargin
+ {\doquadrupleempty\dodefineinmargin}
+
+\def\dodefineinmargin[#1][#2][#3][#4]%
+ {\doifassignmentelse{#4}
+ {\setupinmargin[#1][#4]%
+ \setvalue{#1}{\indentation\doquintupleempty\doinmargin[#2][#3][#1]}}
+ {\setvalue{#1}{\indentation\doquintupleempty\doinmargin[#2][#3][#4]}}}
+
+\defineinmargin [inleft] [\v!left] [\v!normal] % takes left settings
+\defineinmargin [inright] [\v!right] [\v!normal] % takes right settings
+\defineinmargin [ininner] [\v!inner] [\v!normal] % takes left/right settings
+\defineinmargin [inouter] [\v!outer] [\v!normal] % takes left/right settings
+\defineinmargin [inmargin] [\@@imlocation] [\v!normal] % takes left/right settings
+\defineinmargin [inother] [\@@imlocation] [\v!reverse] % takes left/right settings
+
+\def\inothermargin{\inother}
+
+%D This permits definitions like:
+%D
+%D \starttyping
+%D \defineinmargin [SomePlace] [inner] [normal] [distance=1cm]
+%D \defineinmargin [SomePlace] [inner] [normal] [SomePlace] \setupinmargin[SomePlace][distance=1cm]
+%D \defineinmargin [MyPlace] [inner] [normal] [SomePlace]
+%D \defineinmargin [YourPlace] [inner] [normal] [SomePlace]
+%D \stoptyping
+%D
+%D A torture test:
+%D
+%D \starttyping
+%D \startbuffer
+%D \inleft {\TestLine{red} {l}} test test test \par
+%D \inright {\TestLine{green} {r}} test test test \par
+%D \inmargin {\TestLine{blue} {m}} test test test \par
+%D \inothermargin{\TestLine{yellow} {x}} test test test \par
+%D \ininner {\TestLine{cyan} {i}} test test test \par
+%D \inouter {\TestLine{magenta}{o}} test test test \par
+%D \stopbuffer
+%D
+%D \dorecurse{80}\getbuffer \page
+%D stoptypen
+%D
+%D and
+%D
+%D \starttyping
+%D \defineinmargin [InOuterA] [outer] [normal] [distance=0cm]
+%D \defineinmargin [InOuterB] [outer] [normal] [distance=1cm]
+%D \defineinmargin [InOuterC] [outer] [normal] [distance=2cm,line=2]
+%D
+%D \startbuffer
+%D \InOuterA{\TestLine{red} {A}} test test test \par
+%D \InOuterB{\TestLine{green}{B}} test test test \par
+%D \InOuterC{\TestLine{blue} {C}} test test test \par
+%D \stopbuffer
+%D
+%D \dorecurse{80}\getbuffer \page
+%D
+%D \dorecurse{10}{\inleft {one} test \inleft {two} test } \page
+%D
+%D \start
+%D \margintext {one} \margintext {two} \input thuan \par
+%D \setupinmargin[1][line=3,distance=1cm]
+%D \margintext [1]{one}
+%D \margintext [2]{two}
+%D \input thuan \page
+%D \stop
+%D
+%D \setupinmargin[3][location=inner,distance=1cm]
+%D \setupinmargin[4][location=outer,distance=2cm]
+%D
+%D % \setupinmargin[left] [line=2]
+%D % \setupinmargin[right][line=2]
+%D
+%D \dorecurse
+%D {10}
+%D {\margintext {\kern3cm\TestLine{blue}{none}}
+%D \margintext[3] {\TestLine{darkgray}{3}}
+%D \margintext[4] {\TestLine{darkgray}{4}}
+%D \margintext[left] {\TestLine{red} {left}}
+%D \margintext[right]{\TestLine{green} {right}}
+%D \margintext[inner]{\TestLine{cyan} {inner}}
+%D \margintext[outer]{\TestLine{magenta} {outer}}
+%D \input thuan \endgraf}
+%D
+%D \dorecurse{10}{\margintext{test\\test\\test} \input thuan \endgraf}
+%D \stoptyping
+
+% Test case:
+%
+% \setuppagenumbering[alternative=doublesided] \setupwhitespace[medium]
+%
+% \placefigure[right]{}{\externalfigure[dummy][width=2cm]}
+% \input tufte \inothermargin{test} \input tufte
+
+\def\dodoinmargin[#1][#2][#3][#4][#5]#6%
+ {\bgroup
+ \forgetall % otherwise sidefloat problems, added 2005/07/20, maybe dangerous
+ \postponefootnotes % group is (somehow) needed
+ \doifinsetelse\v!low{#4}
+ {\chardef\margincontentdisplacement\plusone}
+ {\chardef\margincontentdisplacement\zerocount}%
+ \doif\v!reverse{#2}
+ {\swapmacros\dorightmarginblock\doleftmarginblock}%
+ \processaction
+ [#1]
+ [ \v!left=>\let\next\doleftmarginblock, % no swapping
+ \v!right=>\let\next\dorightmarginblock, % no swapping
+ \v!inner=>\def\next{\doinmarginswapped\dorightmarginblock\doleftmarginblock },
+ \v!outer=>\def\next{\doinmarginswapped\doleftmarginblock \dorightmarginblock},
+ \s!unknown=>\ifdubbelzijdig
+ \doifcommonelse{+,-}{#4}
+ {\def\next{\doinmarginswapped\dorightmarginblock\doleftmarginblock }}
+ {\def\next{\doinmarginswapped\doleftmarginblock \dorightmarginblock}}%
+ \else
+ \let\next\doleftmarginblock
+ \fi]%
+ \next{#3}{#6}%
+ \rawpagereference\s!mar{#5}% naar binnen ! ! ! !
+ \flushnotes
+ \egroup % don't forget the group
+ \ignorespaces}
+
+% dit zijn voorlopig lokale commando's / vervallen
+%
+% \def\woordinmarge {\indentation\doquintupleempty\doinmargin[\@@implaats][\inleftmargin][\inrightmarge]}
+%
+% \def\woordinlinker {\inleftmargin } % vervallen
+% \def\woordinrechter{\inrechtermarge} % vervallen
+
+% Some day: \definemarking[\v!margetitel]
+
+%D Now come the margin text collectors. The collected content is
+%D flushed at every paragraph by the following macro. Note for
+%D myself: here the location (plaats) is no longer a tag (number).
+
+% gone: \def\doflushmargincontent{\doinmargin[\@@implaats][\v!normaal][]} % + [#1][#2]{#3}}
+
+%D These are now all the same (long ago they had different
+%D implementations, somewhere in Sork time if I remember
+%D right).
+
+\def\margintext {\dodoubleempty\domargincontent}
+\def\marginword {\margintext}
+\def\margintitle{\margintext} % txt mark as well
+
+\newtoks\collectedmargintexts
+\chardef\margintextcollected \zerocount
+
+\def\domargincontent[#1][#2]#3% we used to check for #2/#1 being number, no longer now
+ {\global\chardef\margintextcollected\plusone
+ \edef\margincontenttag{#1}%
+ \ifx\margincontenttag\empty
+ \doglobal\increment\margincontentlevel
+ \let\margincontenttag\margincontentlevel
+ \fi
+ \checkinmargin[\margincontenttag]%
+ \doglobal \appendetoks
+ \noexpand \checkinmargin[\margincontenttag]%
+ \noexpand \doinmargin[\executeifdefined{\??im\margincontenttag\c!location}\@@imlocation][\v!normal][\margincontenttag][\margincontenttag][#2]%
+ \to \collectedmargintexts
+ \doglobal \appendtoks
+ {#3}%
+ \to \collectedmargintexts}
+
+\let\restoreinterlinepenalty\relax
+
+\def\flushmargincontents % plural
+ {\restoreinterlinepenalty % here?
+ \ifcase\margintextcollected\else % called quite often, so we
+ \expandafter\doflushmargincontents % speed up the \fi scan by
+ \fi} % using a \do..
+
+\def\doflushmargincontents % links + rechts
+ {\bgroup
+ \forgetall
+ \global\margincontentheight\zeropoint
+ \startsignalrightpage
+ \the\collectedmargintexts
+ \signalrightpage
+ \stopsignalrightpage
+ \resetmargincontent
+ % dirty tricks
+ \ifcase\margincontentmethod
+ \donefalse
+ \else\ifinsidecolumns % brrrr
+ \donetrue % how fuzzy
+ \else\ifdim\margincontentheight>\lineheight\relax
+ \donetrue % how dirty
+ \else
+ \donefalse % how needed
+ \fi\fi\fi
+ \savemargincontentlines
+ \ifdone
+ \advance\margincontentheight \margincontentextralines\lineheight
+ \ifdim\pagegoal>\pagetotal
+ \bgroup % preserve \margincontentheight
+ \advance\margincontentheight \pagetotal
+ \ifdim\margincontentheight>\pagegoal
+ \egroup
+ \ifcase\marginpagecheckmethod
+ % disabled
+ \or
+ \setmargincontentpenalties
+ \or
+ % potentially dangerous, maybe better a \goodbreak; the problem is that
+ % there can be a penalty there, which we then overload and we also introduce
+ % nasty side effects, so, we drop this option
+ % \vadjust pre {\page}%
+ \fi
+ \else
+ \egroup
+ \fi
+ \fi
+ \else % We need the above because interlinepenalties overrule vadjusted \nobreaks.
+ % a bit dangerous
+ \vadjust{\nobreak}%
+ \fi
+ \egroup}
+
+\def\setmargincontentpenalties
+ {\getnoflines\margincontentheight
+ \keeplinestogether\noflines}
+
+\def\savemargincontentlines
+ {\bgroup
+ \advance\margincontentheight \margincontentextralines\lineheight % 1 by default
+ \getnoflines\margincontentheight
+ \xdef\nofmargincontentlines{\the\noflines}%
+ \egroup}
+
+\def\fillupmargincontentlines % etex ! ! !
+ {\endgraf
+ \begingroup
+ \scratchcounter\numexpr\nofmargincontentlines-\prevgraf\relax\relax
+ \ifnum\scratchcounter>\zerocount
+ \forgetall\dorecurse\scratchcounter{\nobreak\crlf}%
+ \fi
+ \endgroup}
+
+% Yet undocumented, for a manual flush in for instance headers.
+
+\def\resetmargincontent
+ {\doglobal\newcounter\margincontentlevel
+ \global\chardef\margintextcollected\zerocount
+ \global\collectedmargintexts\emptytoks}
+
+% \def\placemargincontent
+% {\ifcase\margintextcollected\else
+% \bgroup
+% \chardef\graphicvadjustmode\zerocount
+% \doflushmargincontents
+% \egroup
+% \fi}
+%
+% font fix:
+
+\def\placemargincontent
+ {\ifcase\margintextcollected\else % was level check
+ \bgroup
+ \redoconvertfont % !!
+ \chardef\graphicvadjustmode\zerocount
+ \doflushmargincontents
+ \egroup
+ \fi}
+
+% For old times sake (i use it in project styles) we provide
+
+\def\placemargintexts {\placemargincontent}
+\def\resetmargetitels {\resetmargincontent}
+\def\margewoordpositie{\margewoord} % obsolete, now no longer range
+
+% but never use them yourself since they may disappear.
+
+\def\oplinker#1%
+ {\strut
+ \graphicvadjust
+ {\dontcomplain
+ \setbox\scratchbox\vtop{\forgetall\strut#1}%
+ \getboxheight\scratchdimen\of\box\scratchbox
+ \vskip-\scratchdimen % waarom stond hier een \ ?
+ \box\scratchbox}}
+
+\setupinmargin
+ [\c!style=\v!bold,
+ \c!color=,
+ \c!strut=\v!auto,
+ \c!location=\v!both,
+ \c!align=\v!inner,
+ \c!stack=\v!no,
+ \c!before=,
+ \c!after=]
+
+\setupinmargin
+ [\v!left]
+ [\c!distance=\leftmargindistance,
+ \c!width=\leftmarginwidth,
+ %\c!align=\v!left, % no
+ \c!location=\v!left]
+
+\setupinmargin
+ [\v!right]
+ [\c!distance=\rightmargindistance,
+ \c!width=\rightmarginwidth,
+ %\c!align=\v!right, % no
+ \c!location=\v!right]
+
+% bonus needed when [inner/outer] is used as tag
+
+\setupinmargin[\v!inner][\c!location=\v!inner,\c!align=\v!inner]
+\setupinmargin[\v!outer][\c!location=\v!outer,\c!align=\v!inner]
+
+% more efficient (5K less fotmat file)
+%
+% \letvalue{\??im\v!inner\c!location}\v!inner \letvalue{\??im\v!inner\c!align}\v!inner
+% \letvalue{\??im\v!outer\c!location}\v!outer \letvalue{\??im\v!outer\c!align}\v!inner
+
+\protect \endinput
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