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%D \module
%D [ file=node-rul,
%D version=2009.11.03, % 1995.10.10,
%D title=\CONTEXT\ Core Macros,
%D subtitle=Bars,
%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.
% todo: ex and and em traveling with attribute
\writestatus{loading}{ConTeXt Core Macros / Bars}
%D \macros
%D {underbar,underbars,
%D overbar,overbars,
%D overstrike,overstrikes,
%D setupbar}
%D
%D In the rare case that we need undelined words, for instance because all font
%D alternatives are already in use, one can use \type {\underbar} and \type
%D {\overstrike} and their plural forms.
%D
%D \startbuffer
%D \underbars {drawing \underbar{bars} under words is a typewriter leftover}
%D \overstrikes {striking words makes them \overstrike {unreadable} but
%D sometimes even \overbar {top lines} come into view.}
%D \stopbuffer
%D
%D \typebuffer
%D
%D \startlines
%D \getbuffer
%D \stoplines
%D
%D The next macros are derived from the \PLAIN\ \TEX\ one, but also supports
%D nesting. The \type{$} keeps us in horizontal mode and at the same time
%D applies grouping.
%D
%D \showsetup{underbar}
%D \showsetup{underbars}
%D \showsetup{overbar}
%D \showsetup{overbars}
%D \showsetup{overstrike}
%D \showsetup{overstrikes}
%D
%D \showsetup{setupunderbar}
%D
%D Nested bars can be configured by appending \type {:<index>} to the category.
%D Normally units in combination with a unitless thickness specification but
%D there units can be used too.
%D
%D \startbuffer
%D \setupbars[unit=mm,rulethickness=1] bar\startbar[underbar]foo\stopbar bar\blank
%D \setupbars[unit=ex,rulethickness=1] bar\startbar[underbar]foo\stopbar bar\blank
%D \setupbars[unit=pt,rulethickness=1] bar\startbar[underbar]foo\stopbar bar\blank
%D \setupbars[unit=pt,rulethickness=10pt] bar\startbar[underbar]foo\stopbar bar
%D \stopbuffer
%D
%D \typebuffer \blank \getbuffer \blank
%D
%D As with many early usage of \LUA\ in \MKIV\ this mechanism explores a way
%D to deal with local settings at the \TEX\ end and remembering parameters
%D at the \LUA\ end. We might do things differently now, but as settings normally
%D don't change that often, we're not in a hurry to do that now. The problem at
%D the \LUA\ end is that we don't know when to clean up.
\unprotect
%definesystemattribute[ruled]
%definesystemattribute[shifted]
\registerctxluafile{node-rul}{1.001}
\installcorenamespace{bar}
\installcorenamespace{barindex}
\installcorenamespace{barattribute}
\installcorenamespace{barstack}
\installcommandhandler \??bar {bar} \??bar
\newtoks\t_node_rules_checklist
\let\c_node_rules_index\relax % temporary synonym
\let\p_node_rules_color\empty
\let\setupbars\setupbar
\appendtoks
\ifsecondargument
\node_rules_define
\else
\the\t_node_rules_checklist
\fi
\to \everysetupbar
\appendtoks
\ifcsname\??barindex\currentbar\endcsname
\csname\??barindex\currentbar\endcsname\zerocount
\else
\expandafter\newcount\csname\??barindex\currentbar\endcsname
\fi
\normalexpanded{\t_node_rules_checklist{\node_rules_redefine{\currentbar}\the\t_node_rules_checklist}}%
\node_rules_define
\setuevalue\currentbar{\node_rules_direct{\currentbar}}%
\to \everydefinebar
\unexpanded\def\node_rules_define
{\edef\p_node_rules_color{\barparameter\c!color}%
\setevalue{\??barattribute\currentbar}{\number\ctxlua{nodes.rules.define {
method = \barparameter\c!method,
offset = \barparameter\c!offset,
continue = "\barparameter\c!continue",
dy = \barparameter\c!dy,
rulethickness = "\barparameter\c!rulethickness",
unit = "\barparameter\c!unit",
order = "\barparameter\c!order",
max = \barparameter\c!max,
ma = \thecolormodelattribute,
ca = \thecolorattribute\p_node_rules_color,
ta = \thetransparencyattribute\p_node_rules_color
}}}}
\unexpanded\def\node_rules_redefine#1%
{\def\currentbar{#1}\node_rules_define}
\unexpanded\def\node_rules_direct#1%
{\groupedcommand{\node_rules_set{#1}}\relax}
\def\node_rules_set
{\ctxlua{nodes.rules.enable()}% will be moved to lua
\glet\node_rules_set\node_rules_set_indeed
\node_rules_set}
\def\node_rules_set_indeed#1% maybe reverse the 1000 (also maybe use more attributes instead of settings)
{\edef\currentbar{#1}%
\expandafter\let\expandafter\c_node_rules_index\csname\??barindex#1\endcsname
\advance\c_node_rules_index\plusone
\usebarstyleandcolor\c!foregroundstyle\c!foregroundcolor
\attribute\ruledattribute\numexpr
\plusthousand*\c_node_rules_index
+\csname\??barattribute#1\ifcsname\??bar#1:\number\c_node_rules_index\s!parent\endcsname:\number\c_node_rules_index\fi\endcsname
\relax}
\unexpanded\def\startbar[#1]%
{\begingroup
\node_rules_set{#1}}
\unexpanded\def\stopbar
{\endgroup}
% ungrouped
\newcount\c_node_rules_nesting % todo: same as colors
\unexpanded\def\pushbar[#1]%
{\global\advance\c_node_rules_nesting\plusone
\expandafter\edef\csname\??barstack\number\c_node_rules_nesting\endcsname{\attribute\ruledattribute\the\attribute\ruledattribute}%
\node_rules_set{#1}}
\unexpanded\def\popbar
{\csname\??barstack\number\c_node_rules_nesting\endcsname
\global\advance\c_node_rules_nesting\minusone}
\setupbars
[\c!method=0, % new: 0=center nested, 1=stack nested
\c!continue=\v!no,
\c!offset=0, % upwards, replaces: topoffset bottomoffset
\c!dy=0,
\c!max=3,
\c!style=,
\c!rulethickness=.1,
\c!order=\v!foreground,
\c!unit=ex, % so now we are relative
\c!color=] % replaces: rulecolor
% \definebar[touchbar] [\c!method=0,\c!dy=-0.4,\c!offset=-0.0]
% \definebar[touchbars] [touchbar] [\c!continue=\v!yes]
\definebar[\v!overstrike][\c!method=0,\c!dy=0.4,\c!offset=0.5,\c!continue=\v!yes]
\definebar[\v!underbar] [\c!method=1,\c!dy=-0.4,\c!offset=-0.3,\c!continue=\v!yes]
\definebar[\v!overbar] [\c!method=1,\c!dy=0.4,\c!offset=1.8,\c!continue=\v!yes]
\definebar
[\v!understrike]
[\c!method=0,
\c!offset=1.375,
\c!rulethickness=2.5,
\c!continue=\v!yes,
\c!order=\v!background,
\c!color=lightgray]
\definebar[\v!overstrikes] [\v!overstrike] [\c!continue=\v!no]
\definebar[\v!underbars] [\v!underbar] [\c!continue=\v!no]
\definebar[\v!overbars] [\v!overbar] [\c!continue=\v!no]
\definebar[\v!understrikes][\v!understrike][\c!continue=\v!no]
% we want these always so ...
\expandafter\let\expandafter\overstrike \csname\v!overstrike \endcsname
\expandafter\let\expandafter\underbar \csname\v!underbar \endcsname
\expandafter\let\expandafter\overbar \csname\v!overbar \endcsname
\expandafter\let\expandafter\overstrikes\csname\v!overstrikes\endcsname
\expandafter\let\expandafter\underbars \csname\v!underbars \endcsname
\expandafter\let\expandafter\overbars \csname\v!overbars \endcsname
\unexpanded\def\setupunderbar[#1]% too incompatible for the moment
{}
%D This will move: (a bit duplicated)
\installcorenamespace{shift}
\installcorenamespace{shiftindex}
\installcorenamespace{shiftattribute}
\installcommandhandler \??shift {shift} \??shift
\newtoks\t_node_shifts_checklist
\let\c_node_shifts_index\relax % temporary synonym
\let\setupshifts\setupshift
\appendtoks
\ifsecondargument
\node_shifts_define
\else
\the\t_node_shifts_checklist
\fi
\to \everysetupshift
\appendtoks
\ifcsname\??shiftindex\currentshift\endcsname
\csname\??shiftindex\currentshift\endcsname\zerocount
\else
\expandafter\newcount\csname\??shiftindex\currentshift\endcsname
\fi
\normalexpanded{\t_node_shifts_checklist{\node_shifts_redefine{\currentshift}\the\t_node_shifts_checklist}}%
\node_shifts_define
\setuevalue\currentshift{\node_shifts_direct{\currentshift}}%
\to \everydefineshift
\unexpanded\def\node_shifts_define
{\setevalue{\??shiftattribute\currentshift}{\number\ctxlua{nodes.shifts.define {
method = \shiftparameter\c!method,
continue = "\shiftparameter\c!continue",
dy = \shiftparameter\c!dy,
unit = "\shiftparameter\c!unit",
}}}}
\unexpanded\def\node_shifts_redefine#1%
{\def\currentshift{#1}\node_shifts_define}
\unexpanded\def\node_shifts_set
{\ctxlua{nodes.shifts.enable()}%
\glet\node_shifts_set\node_shifts_set_indeed
\node_shifts_set}
% \unexpanded\def\node_shifts_direct#1%
% {\doisolatedgroupedalign{\node_shifts_set{#1}}\donothing}
\unexpanded\def\node_shifts_direct#1%
{\groupedcommand
{\begingroup\dostartisolation\begingroup\node_shifts_set{#1}}
{\endgroup\dostopisolation\endgroup}}
\def\node_shifts_set_indeed#1% todo: check parent !
{\def\currentshift{#1}%
\expandafter\let\expandafter\c_node_shifts_index\csname\??shiftindex#1\endcsname
\advance\c_node_shifts_index\plusone
\attribute\shiftedattribute\numexpr
\plusthousand*\c_node_shifts_index
+\csname\??shiftattribute#1\ifcsname\??shift#1:\number\c_node_shifts_index\s!parent\endcsname:\number\c_node_shifts_index\fi\endcsname
\relax
\useshiftstyleandcolor\c!style\c!color
\dosetupisolatedalign{\shiftparameter\c!align}}
\unexpanded\def\startshift[#1]%
{\begingroup
\node_shifts_set{#1}}
\unexpanded\def\stopshift
{\endgroup}
\setupshifts
[\c!method=0,
\c!continue=\v!no,
\c!dy=0,
\c!unit=ex,
\c!align=,
\c!style=,
\c!color=]
\defineshift [\v!shiftup] [\c!method=0,\c!dy=-1,\c!unit=ex,\c!continue=\v!yes,\c!style=\txx,\c!color=]
\defineshift [\v!shiftdown] [\c!method=1,\c!dy=.3,\c!unit=ex,\c!continue=\v!yes,\c!style=\txx,\c!color=]
% we want these always so ...
\expandafter\let\expandafter\shiftup \csname\v!shiftup \endcsname
\expandafter\let\expandafter\shiftdown \csname\v!shiftdown \endcsname
% This is a weird helper:
\unexpanded\def\dostartisolation{\signalcharacter}
\unexpanded\def\dostopisolation {\signalcharacter}
\unexpanded\def\doisolator {\signalcharacter}
\unexpanded\def\dosetupisolatedalign#1%
{\doisolator
\setupalign[#1]\relax}
\unexpanded\def\doisolatedgroupedalign#1#2%
{\groupedcommand
{\begingroup\dostartisolation\begingroup#1}
{#2\endgroup\dostopisolation\endgroup}}
\protect \endinput
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