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% aoutput.sty
% ArabTeX
% Version 04.12.95
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% (c) Klaus Lagally
%     Institut fuer Informatik
%     Universitaet Stuttgart
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\a@ident {aoutput.sty} {3.04 build output lines} {04.12.95}

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\newdimen \a@hsize		\newdimen \a@limit
\newdimen \line@wd          	\newdimen \wd@wd
\newdimen \a@leftmargin 	\newcount \a@prevgraf

\def \setspace #1{\def \arab@space {\hskip #1\relax }}% redefine ?

\def \arab@space {\space \hskip 0pt plus 0.001fil \relax }

\def \def@arabstrut {\def \arab@strut {\if@vocals 
%\vrule height2.5ex depth2.0ex width\z@ \relax \else
\vrule height2ex depth1.5ex width\z@ \relax \else
%\vrule height3ex depth1.5ex width\z@ \relax \else
\vrule height2ex depth1.0ex width\z@ \relax \fi }}

\def \a@parparams {% get paragraph dimensions
\ifnum \parshape = \z@ \a@hsize \hsize 
\a@leftmargin \z@
\else \a@hsize \linewidth \a@leftmargin \@totalleftmargin
\fi 
\a@leftmargin \z@
\a@prevgraf \z@ \spreadfalse }

\def \a@resetpar {% called by \a@par
\a@prevgraf \z@ }

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% control variables for the "arabtext" environment:
% 
% \the\arabtext@hook: executed when entering the environment
% 
% \ifa@vmode: Arabic paragraph closed?
% 
% \ifa@space: deposit a space?
% 
% \ifspread: fill line by spreading the words?
% 
% \ifarab: ignore Arabic script output?
% 
% \a@parindent: skip at beginning of first line of paragraph
% \a@parindent: saved value from Roman mode
% 
% \a@parskip: saved value from Roman mode
% 
% \the\a@@everypar: token list, executed when starting a paragraph
% 
% \a@oldhmode: saved value from outside
% 
% \a@short@line: finish last line, close paragraph
% 
% \a@put@line: deposit current line buffer, continue paragraph
% 
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% TeX/LaTeX parameters influencing the shape of a paragraph:
% 
% \hsize, \leftskip, \rightskip, \parindent, \parskip
% \parshape, \hangindent, \hangafter, \linewidth, \@totalleftmargin
% 
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% internal control:
% 
% \a@hsize = length of line buffer including \leftskip, \rightskip
% \a@limit = maximal Arabic text length
% 
% \a@vmodetrue : linebuffer undefined, \a@hsize valid
% \a@vmodefalse: linebuffer valid, \a@limit valid, \a@@everypar used
% 
%%%%%%%%%%%%%%%%%%%%%%% output routines %%%%%%%%%%%%%%%%%%%%%%%%%

\def \putwordb@x #1{% deposit a word
\ifa@vmode \arab@indent \fi 
\setbox \wordb@x \hbox {#1}\put@word }

\def \arab@indent {% like \indent for Arabic
\ifa@vmode \putlineb@x {\hskip \a@parindent }\the\a@@everypar
\else \setbox \wordb@x \hbox {\hskip \a@parindent }\add@word \fi }

\def \arab@noindent {% like \noindent for Arabic
\ifa@vmode \initlineb@x \the\a@@everypar \fi }

\def \leavea@vmode {% like \leavevmode for Arabic
\ifa@vmode \arab@indent \fi }

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\def \initlineb@x {% make an empty Arabic line
\putlineb@x {}\a@spacefalse }

\def \putlineb@x #1{% open the line box
\a@vmodefalse \a@limit \a@hsize 
\advance \a@limit -\leftskip \advance \a@limit -\rightskip
\setbox \lineb@x \hbox {#1}\a@spacefalse }

\def \add@word {% add word to line without space
\putlineb@x {\unhbox \wordb@x \unhbox \lineb@x }}

\def \addt@line {% add word to line unconditionally, spacing ?
\ifa@space \putlineb@x
   {\unhcopy \wordb@x \arab@space \unhcopy \lineb@x }%
\else \add@word \fi }

\def \put@word {% add word to line, spacing, break line if necessary
\setbox \tempb@x \hbox
{\unhcopy \wordb@x \ifa@space \arab@space \fi \unhcopy \lineb@x }%
\ifdim \a@limit < \wd\lineb@x \put@line \add@word \else 
\ifdim \a@limit < \wd\tempb@x \put@line \add@word \else 
\setbox \lineb@x \box \tempb@x
\fi\fi }

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\def \put@line {% output the line, adjusted
\ifarab \setbox\tempb@x \hbox to \a@hsize 
	{\hskip \rightskip \arab@strut
	\charsubdefmax \m@ne \unhbox \lineb@x \hskip \leftskip }%
	\put@ab@x 
\fi \ifnum \tracingarab > 1 \message {|}\fi }

\def \short@line{% put line without adjustment, close line
\ifarab \ifdim \wd\lineb@x = \z@ \else
\ifspread \wd@wd \a@limit \divide \wd@wd 8
	\line@wd \a@limit \advance \line@wd -\wd\lineb@x
	\setbox\tempb@x \hbox to \a@hsize 
	{\hskip \rightskip 
	\loop 
%	\hfil 
	\hskip \parfillskip
	\advance \line@wd -\wd@wd
	\ifdim \line@wd > \z@ \repeat \arab@strut
	\charsubdefmax \m@ne \unhbox \lineb@x \hskip \leftskip }%
\else \setbox\tempb@x \hbox to \a@hsize 
	{\hskip \rightskip \hskip \parfillskip \arab@strut
	\charsubdefmax \m@ne \unhbox \lineb@x \hskip \leftskip }%
\fi \put@ab@x 
\fi\fi
\ifnum \tracingarab > 1 \message {/}\fi }

\def \put@ab@x {% deposit line
\ifhmode \unskip {\endgraf }\penalty \clubpenalty 
\parindent \z@ \parskip \z@ \else
\ifnum \a@prevgraf = \z@ \else \penalty \widowpenalty 
\fi\fi 
\advance \a@prevgraf \@ne
\begingroup \parfillskip 0pt plus 1fill 
	\leftskip \z@ \rightskip \z@ \noindent 
	\ifdim \a@leftmargin = \z@ \else \hskip \a@leftmargin \fi
	\box\tempb@x \endgraf 
\endgroup \parindent \z@ \parskip \z@ \initlineb@x }

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\let \a@par@hook \relax % reserved

\def \testoutput {% show output box
\showboxbreadth = \maxdimen     \showboxdepth = 6
\tracingoutput = 1 }

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\endinput
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