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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Module: ZzTeX Tabbing Facilities
%
% Synopsis: This module contains the definition of the block that is
% used to format text with tab stops.
%
% Authors: Paul C. Anagnostopoulos
% Created: 27 May 2016
%
% Copyright 1989--2020 by Paul C. Anagnostopoulos
% under The MIT License (opensource.org/licenses/MIT)
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Tabbing Block
% ------- -----
\defineblock{\tabbing}{\endtabbing}{\false}{}
\resetinvcontext{\tabbing}
%~block tabbing Type
% \abovepenalty = integer % Penalty above text.
% \aboveskip = glue % Space b/b above text.
% \setflag \autocallout = boolean % Automatically number lines?
% \def \beginformat {...} % Beginning of text formatter.
% \belowpenalty = integer % Penalty below text.
% \belowskip = glue % Space b/b below text.
% \bodyfont = {font} % Body font.
% \def \calloutformat ##1{...} % Callout formatter.
% \calloutnumber = integer % Number of first callout.
% \def \callouttext {...} % Callout text or \arg.
% \defaulttabwidth = dimen % Default repeating tab width.
% \def \endformat {...} % End of text formatter.
% \leftindent = glue % Left indentation.
% \rightindent = glue % Right indentation.
% \tabbinggapskip = glue % Standard tabbing gap.
% \textcolor = {...} % Color of text.
% \width = dimen % Line width.
%~end
\defineskip{\tabbinggapskip}{0pt}
\def \tabbing #1{% {type}
\blockcantbein{\tabbing}{\tabbing}%
\beginblockscope{tabbing}%
\global\increment \tabbingdepth
\abovepenalty = \breakgood %~default hard
\setflag \autocallout = \false %~default soft
\def \beginformat {}% %~default soft
\belowpenalty = \breakgood %~default hard
\calloutnumber = 1 %~default with
\def \callouttext {\number\calloutnumber}% %~default soft
\defaulttabwidth = \mindimen %~default soft
\def \endformat {}% %~default soft
\tabbinggapskip = \enclosingbaselineskip %~default soft
\textcolor = {}% %~default soft
\parindent = 0pt
\parrag = 0pt
\parskip = 0pt
\processdesign{\tabbing}{#1}%
\global\increment \tabbingnumber
\tabbingformat
\def \zarg {\arg}%
\if \tokeqlp{\callouttext}{\zarg}%
\defineatsigncommand @##{\ztbngatcallout}%
\else
\defineatsigncommand @##{\ztbngatcallout{\callouttext}}%
\fi
\if \emptytoksp{\textcolor}% % Must have a group around \ztbnginit.
\bgroup
\else
\color{\the\textcolor}%
\fi
\ztbnginit
\ztbngstartline}
\def \endtabbing {%
\ztbngfinal
\if \emptytoksp{\textcolor}%
\egroup % \tabbing group
\else
\endcolor
\fi
\futurelet\nexttoken \zendtabbing}
\def \zendtabbing {%
\endtabbingformat
\global\decrement \tabbingdepth
\endblockscope{tabbing}%
\parnext}
\def \tabbingformat {%
\endgraf
\the\bodyfont
\bbskipabove{\abovepenalty}{\aboveskip}%
\alterindentation{\leftindent}{\rightindent}%
\settextwidth{\width}%
\beginformat}
\def \endtabbingformat {%
\endformat
\bbskipbelowblockpar{\nexttoken}{\belowpenalty}{\belowskip}}
%~ Use this command in between lines in a |\tabbing| block to
%~ perform a vertical adjustment between those two lines. For example,
%~
%~ \adjusttabbing{\fullpagebreak}
\long\def \adjusttabbing #1{% {commands}
\ztbngadjust{#1}}
% Initialize and Finalize
% ---------- --- --------
\definecount{\ztbngstopcount}{0}
\definecount{\ztbngstopindex}{0}
\definebox{\ztbngline}
\definebox{\ztbngfragment}
\def \ztbnginit {%
\let \par = \ztbngshouldntbepar
\def \nl {\ztbngfinishline{\false}}%
\defineatsigncommand @.{\ztbngatsetstop}%
\defineatsigncommand @>{\ztbngattab}%
\defineatsigncommand @C{\ztbngatclear}%
\defineatsigncommand @D{\ztbngatdiscard}%
\ztbngsetdefaultstops{\defaulttabwidth}}
\def \ztbngsetdefaultstops #1{% {width}
\global\ztbngstopcount = 0
\def \ztbngstop {0pt}%
\if \dimgtrp{#1}{0pt}%
\tdimena = 0pt
\loop
\global\increment \ztbngstopcount
\advance \tdimena by #1\relax
\withname\edef {\ztbngstop\romannumeral\ztbngstopcount}{\the\tdimena}%
\if \dimlssp{\tdimena}{\hsize}%
\repeat
\fi}
\def \ztbngfinal {%
\ztbngfinishline{\true}}
% Build Lines
% ----- -----
\def \ztbngstartline {%
\ztbngstopindex = 0
\setbox\ztbngline = \hbox{}%
\global\setflag \ztbngdiscardp = \false
\settaginfo{\number\calloutnumber}{???title???}%
\ztbngstartfragment}
\def \ztbngstartfragment {%
\setbox \ztbngfragment = \hbox\bgroup
\ignorespaces}
\def \ztbngfinishfragment {%
\egroup % \ztbngfragment box
\setbox\ztbngline = \hbox{%
\unhbox\ztbngline
\tdimena = \name{\ztbngstop\romannumeral\ztbngstopindex}%
\hskip \tdimena
\tdimenb = \hsize
\advance \tdimenb by -\tdimena
\hbox to \tdimenb{\copy\ztbngfragment \hfil}%
\hskip -\tdimenb
\hskip -\tdimena}}
\def \ztbngfinishline #1{% {end-of-block?}
\ztbngfinishfragment
\if \notp{\ztbngdiscardp}%
\if \orp{\posp{\ztbngstopindex}}{\dimposp{\wd\ztbngfragment}}%
\noindent
\if \autocallout
\llap{\calloutformat{\the\calloutnumber}}%
\increment \calloutnumber
\fi
\box\ztbngline
\endgraf
\else\if \notp{#1}%
\vspace{\tabbinggapskip}%
\fi\fi
\fi
\if #1\let \znext = \relax \else \let \znext = \ztbngstartline \fi
\znext}
% At-sign Commands
% ------- --------
% @#{callout}text...
\def \ztbngatcallout #1{% {callout}
\ztbngfinishfragment
\if \andp{\zerop{\ztbngstopindex}}{\dimzerop{\wd\ztbngfragment}}
\setbox\ztbngfragment = \hbox\bgroup
\llap{\calloutformat{#1}}%
\ztbngfinishfragment
\else
\error{badtabcallout}{Callout command (\noexpand@##) must appear
at the beginning of the line}%
\fi
\increment \calloutnumber
\ztbngstartfragment}
% text@.more text...
\def \ztbngatsetstop {%
\ztbngfinishfragment
\tdimena = \name{\ztbngstop\romannumeral\ztbngstopindex}%
\advance \tdimena by \wd\ztbngfragment
\increment \ztbngstopindex
\if \gtrp{\ztbngstopindex}{\ztbngstopcount}%
\withname\edef {\ztbngstop\romannumeral\ztbngstopindex}{\the\tdimena}%
\increment \ztbngstopcount
\else
\error{badtabstop}{There is already a tab stop}%
\fi
\ztbngstartfragment}
% text@>more text...
\def \ztbngattab {%
\ztbngfinishfragment
\if \lssp{\ztbngstopindex}{\ztbngstopcount}%
\increment \ztbngstopindex
\else
\warning{toomanytabs}{Too many tabs on line; extra tabs ignored}%
\fi
\ztbngstartfragment}
% @Ctext...\nl
\def \ztbngatclear {%
\if \zerop{\ztbngstopindex}%
\global\ztbngstopcount = 0\relax
\else
\error{badtabclear}{Tabs must be cleared at the beginning of the line}%
\fi}
% text@D\nl
\def \ztbngatdiscard {%
\global\setflag \ztbngdiscardp = \true \relax}
% Adjustment
% ----------
\long\def \ztbngadjust #1{% {commands}
\ztbngfinishfragment
\if \andp{\zerop{\ztbngstopindex}}{\dimzerop{\wd\ztbngfragment}}
#1%
\else
\error{badtabadjust}{The \noexpand\adjusttabbing command must appear
in between lines}%
\fi
\ztbngstartfragment}
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