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%D \module
%D [ file=typo-dig,
%D version=2010.01.18,
%D title=\CONTEXT\ Typesetting Macros,
%D subtitle=Digits,
%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 Typesetting Macros / Local Boxes}
% musical timestamp: New Scary Goldings ft. John Scofield MonoNeon & Louis Cole (late
% October 2021)
% maybe: \iflocalleftbox
\registerctxluafile{typo-lbx}{autosuffix}
%D The advantage is that it's deal with in the par builder which has some advantages
%D but when used in complex situation there can be side effects. Therefore is should
%D be considered a somewhat low level mechanism on top of which one can write more
%D mechanisms that provide more rendering control. Also, keep in mind that combining
%D many instances at the same time add some complizity. Therefore, for the moment it's
%D a playground.
\unprotect
\def\v!lefttext {lefttext}
\def\v!righttext{righttext}
\appendtoks
\localleftbox {}% \nolocalboxes : we don't have a nice command category for it
\localrightbox{}%
\to\everyforgetall
\definesystemattribute[localboxes][public]
%D We used to pass arguments but there might be many so ...
\newbox\localboxcontentbox
\installcorenamespace{localboxes}
\installcorenamespace{localboxesattribute}
\installcorenamespace{localboxesnamespace}
\installcorenamespace{localboxeslocations}
\installcommandhandler \??localboxes {localboxes} \??localboxes
\setuplocalboxes
[\c!location=\v!left]
\newcount\c_typo_localboxes
\appendtoks
\global\advance\c_typo_localboxes\plusone
\global\expandafter\integerdef\csname\??localboxesattribute\currentlocalboxes\endcsname\c_typo_localboxes
\gletcsname\??localboxesnamespace\number\c_typo_localboxes\endcsname\currentlocalboxes
\to \everydefinelocalboxes
%D The optional argument forces seting the \quote {whole} paragraph properties (which is needed
%D when the assignment happens after e.g.\ \type {\everypar} but is also meant for the first
%D line.
\def\typo_paragraphs_l#1{\localleftbox \ifcstok{#1}\v!global par\fi}
\def\typo_paragraphs_r#1{\localrightbox\ifcstok{#1}\v!global par\fi}
\permanent\tolerant\protected\def\leftparbox [#1]{\typo_paragraphs_l{#1}\bgroup\enforced\let\leftparbox \relax\let\next}
\permanent\tolerant\protected\def\rightparbox [#1]{\typo_paragraphs_r{#1}\bgroup\enforced\let\rightparbox\relax\let\next}
\permanent\tolerant\protected\def\appendleftparbox [#1]{\dowithnextbox{\leftparbox [#1]{\the\localleftbox \unhbox\nextbox}}\hbox}
\permanent\tolerant\protected\def\appendrightparbox [#1]{\dowithnextbox{\rightparbox[#1]{\the\localrightbox\unhbox\nextbox}}\hbox}
\permanent\tolerant\protected\def\prependleftparbox [#1]{\dowithnextbox{\leftparbox [#1]{\unhbox\nextbox\the\localleftbox }}\hbox}
\permanent\tolerant\protected\def\prependrightparbox[#1]{\dowithnextbox{\rightparbox[#1]{\unhbox\nextbox\the\localrightbox}}\hbox}
\permanent\tolerant\protected\def\resetleftparbox [#1]{\typo_paragraphs_l{#1}{}}
\permanent\tolerant\protected\def\resetrightparbox [#1]{\typo_paragraphs_r{#1}{}}
% called back:
\permanent\protected\def\localboxcommand
{\ifcsname\??localboxesnamespace\number\localboxattribute\endcsname
%\edef\currentlocalboxes{\lastnamedcs}%
\expandafter\let\expandafter\currentlocalboxes\lastnamedcs
\setbox\localboxcontentbox\hbox
{\uselocalboxesstyleandcolor\c!style\c!color
\localboxesparameter\c!command}%
\fi}
%D We don't group because we set the local boxes. Also, watch out: by injecting the
%D existing local box we create nested ones. This is handled in the callback but if
%D really needed one can do something like (do we need a primitive?):
% \localrightbox{%
% \the\localrightbox
% \setbox\scratchbox\lastbox
% \unhbox\scratchbox
% additional}%
\def\typo_localboxes_zero#1#2%
{\ifcsname\??localboxesattribute#1\endcsname
\hpack attr \localboxesattribute \lastnamedcs to \zeropoint \bgroup
\edef\currentlocalboxes{#1}%
#2%
\egroup
\fi}
\def\typo_localboxes_asis#1#2%
{\hpack \bgroup % todo: use width if dimension, use distance if given
\edef\currentlocalboxes{#1}%
\localboxesparameter\c!command{#2}%
\egroup}
\defcsname\??localboxeslocations\v!left\endcsname#1#2%
{\leftparbox \bgroup
\typo_localboxes_zero{#1}{#2}%
\the\localleftbox
\egroup}
\defcsname\??localboxeslocations\v!right\endcsname#1#2%
{\rightparbox \bgroup
\the\localrightbox
\typo_localboxes_zero{#1}{#2}%
\egroup}
\defcsname\??localboxeslocations\v!lefttext\endcsname#1#2%
{\leftparbox \bgroup
\typo_localboxes_asis{#1}{#2}%
\the\localleftbox
\egroup}
\defcsname\??localboxeslocations\v!righttext\endcsname#1#2%
{\rightparbox \bgroup
\the\localrightbox
\typo_localboxes_asis{#1}{#2}%
\egroup}
\permanent\tolerant\protected\def\localbox[#1]%
{\dowithnextboxcontent
{\edef\currentlocalboxes{#1}%
\uselocalboxesstyleandcolor\c!style\c!color}
{\ifcsname\??localboxeslocations\namedlocalboxesparameter{#1}\c!location\endcsname
\expandafter\lastnamedcs
\else
\csname\??localboxeslocations\v!left\expandafter\endcsname
\fi{#1}{\unhbox\nextbox}}%
\hbox}
\permanent\tolerant\protected\def\startlocalbox[#1]%
{\dowithnextbox
{\ifcsname\??localboxeslocations\namedlocalboxesparameter{#1}\c!location\endcsname
\expandafter\lastnamedcs
\else
\csname\??localboxeslocations\v!left\expandafter\endcsname
\fi{#1}{\unhbox\nextbox}}%
\hbox\bgroup
\edef\currentlocalboxes{#1}%
\uselocalboxesstyleandcolor\c!style\c!color
\enforced\def\stoplocalbox{\removeunwantedspaces\egroup}%
\ignorespaces}
\aliased\let\stoplocalbox\donothing
%D Here is an example of usage:
%D \starttyping
%D \definelocalboxes
%D [linenumber]
%D [command=\LeftNumber,location=left,width=3em,style=\bs,color=darkred]
%D
%D \definelocalboxes
%D [linenumbertwo] [linenumber]
%D [command=\RightNumber,location=right,width=6em,style=\bf,color=darkgreen]
%D
%D \definelocalboxes
%D [linetext]
%D [command=\LeftText,location=lefttext,style=\bs,color=darkblue]
%D
%D \definelocalboxes
%D [linetexttwo] [linetext]
%D [command=\RightText,location=righttext,style=\bf,color=darkgray]
%D
%D % \def\LineNumberL{\the\localboxlinenumber}
%D % \def\LineNumberR{\the\localboxlinenumber}
%D
%D % \newcount\MyLineNumberL
%D % \newcount\MyLineNumberR
%D % \def\LineNumberL{\global\advance\MyLineNumberL\plusone\the\MyLineNumberL}
%D % \def\LineNumberR{\global\advance\MyLineNumberR\plusone\the\MyLineNumberR}
%D
%D \definecounter[MyLineNumberL]
%D \definecounter[MyLineNumberR]
%D
%D \setupcounter[MyLineNumberL][numberconversion=characters]
%D \setupcounter[MyLineNumberR][numberconversion=romannumerals]
%D
%D \def\LineNumberL{\incrementcounter[MyLineNumberL]\convertedcounter[MyLineNumberL]}
%D \def\LineNumberR{\incrementcounter[MyLineNumberR]\convertedcounter[MyLineNumberR]}
%D
%D \protected\def\LeftNumber {\hbox to \localboxesparameter{width}{\strut(\LineNumberL\hss)}}
%D \protected\def\RightNumber{\hbox to \localboxesparameter{width}{\strut(\hss\LineNumberR)}}
%D
%D % \protected\def\LeftNumber {\hbox to \localboxesparameter{width}{\strut\box\localboxcontentbox\hss)}}
%D % \protected\def\RightNumber{\hbox to \localboxesparameter{width}{\strut(\hss\box\localboxcontentbox)}}
%D
%D \protected\def\LeftText #1{#1\quad}
%D \protected\def\RightText#1{\quad#1}
%D
%D \start
%D \localbox[linenumber]{}%
%D \localbox[linenumbertwo]{}%
%D \localbox[linetext]{L}%
%D \startlocalbox[linetexttwo]
%D R
%D \stoplocalbox
%D \dorecurse{100}{
%D \samplefile{tufte}
%D \par
%D }
%D \stop
%D \stoptyping
\protect \endinput
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