blob: 13e0d5b289051c764d06812cbc30e363aa4c164c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% abidir.sty
% ArabTeX macros for bidirectional linebreaking
% 22.08.2003
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% (c) Klaus Lagally
% Institut fuer Formale Methoden der Informatik
% Universitaet Stuttgart
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ifx \a@RL \undefined \else \xpa \endinput \fi
\a@ident {abidir.sty} {3.11 bidirectional linebreaking} {22.08.2003}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% <LR insertion inside Rtext>
%\def \test@insert #1>{\a@Linsert {#1}}
% \LR{#1} = LR insertion inside Rtext
\def \a@c@LR {\unarab@codes \a@Linsert }
\let \a@c@L \a@c@LR % usage: \L {LR text}
% \LR{#1} = LR insertion inside Ltext: trivial
\let \LR \relax \let \L \relax
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \RL{#1} = RL insertion inside Ltext
\def \RL {\protect \a@RL }
\let \R \RL % usage: \R {RL text}
% \RL{#1} = RL insertion inside Rtext: trivial
\def \a@c@RL #1{\test@token #1 } \let \a@c@R \a@c@RL
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def \goodpar {% usage: \goodpar {Roman paragraphs}
% put around one or more paragraphs if the linebreaking is bad
% caution: may lead to storage overflow
\dimen0 \prevdepth \setbox0 \vbox \bgroup \prevdepth \dimen0
\def \par {\egroup \endgraf \goodpar x}% dummy character
\aftergroup \g@@dpar \let \next=}
\def \g@@dpar {\unvbox0 }
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newdimen \a@Llength \newdimen \a@Lwidth \newdimen \a@Lindent
\newdimen \a@Rlength \newdimen \a@Rheight
\newbox \a@Rboxi \newbox \a@Rboxii \newbox \Rinsertb@x
\newbox \a@Rdummyi \newbox \a@Rdummyii \newbox \Linsertb@x
\newbox \a@spacebox \newif \ifR@split \newcount \a@lines
\def \ins@skip {\hskip \z@ plus 0.1em }% before and after insertion
\def \a@vglue {\z@ plus 2ex }% glue at top of the insertion \vbox
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def \a@RL {% RTL insertion inside LRtext
\ifaRL \else \aRLtrue
\let \a@RLpar \par % prepare for normal baselines
\edef \a@lslimit {\lineskiplimit \the\lineskiplimit}%
\def \par {\a@RLpar \let \par \a@RLpar \a@lslimit \aRLfalse }%
\fi \lineskiplimit -.9\baselineskip % enforce uniform baselines
\bgroup \arab@codes \set@arabfont \@waslafalse \@wasfalse \a@@Rinsert }
\def \a@@Rinsert #1{% RL insertion inside Ltext
\ifshow \a@@verb {#1}\fi % verbating listing
\ifarab \a@Rinsert {#1} \fi % arabic writing
\iftrans \set@transfont \trans@text #1 \end \/\fi
\ifnum \tracingarab > \@ne \message {>}\fi
\unskip \egroup }
\def \a@Rinsert #1{% put a sequence of RL words into Ltext
\leavevmode % go to hmode if not there already
\ifinner \a@sequence {#1}% inside a \hbox: append
\else \a@Rsplit {#1}% splice into the current paragraph
\fi }
\def \a@Rsplit #1{% splice RL words into the current paragraph
\bgroup \def \next@command {\test@special}\transfalse \showfalse
\ifspread \else \def \arab@space {\space }% no infinite stretch !!
\def \tat@skip {0.04ex plus 0.5ex }%
\fi
\a@Rdimen {#1}% get the length of the first 2 RL words
\ifdim \wd\a@Rboxii = \z@
\unhbox\a@Rboxi % done with the insertion
\else \a@Ldimen % get the dimensions of the last line
\a@Rtobox {#1}% pack the insertion lines into a \vbox
\a@Runpack % unpack and splice into the current paragraph
\fi \egroup }
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def \a@Rdimen #1{% get the dimensions of the first two words
\setbox\a@Rboxii \hbox {}\setbox\a@Rdummyii \box\a@Rboxii
\a@Rfirst #1 \to \a@wordi \a@Rrest
\xpa \a@Rwordtobox \a@wordi \to \a@Rboxi \a@Rdummyi
\ifx \space \a@Rrest \else
\ifx \relax \a@Rrest \relax \else
\xpa \a@Rfirst \a@Rrest \to \a@wordii \a@Rrest
\xpa \a@Rwordtobox \a@wordii \to \a@Rboxii \a@Rdummyii
\fi\fi }
\def \a@Rwordtobox #1\to #2#3{% Rword to \box#2, Rdummy to \box#3
\a@sequence {#1}\setbox#2 \lastbox
\setbox#3\hbox to \wd#2{\hfill }\ht#3\ht#2\dp#3\z@}
{\catcode `\^^a0 12
\gdef \a@Rfirst #1 #2\to #3#4{% split off first word
\ifx \relax #1\relax \a@Rfirsti #2\to #3#4\else
\ifx \relax #2\relax \a@Rfirstii #1^^a0\to #3#4\else
\def #3{#1}\def #4{#2}\fi\fi }
\gdef \a@Rfirstii #1^^a0#2\to #3#4{% split off first word
\ifx \relax #1\relax \a@Rfirstiii #2\to #3#4\else
\def #3{#1}\def #4{#2 }\fi }
}% catcode ^^a0
\def \a@Rfirsti #1\to #2#3{% split off leading space
\ifx \relax #1\relax \def #2{\relax }\def #3{\relax }%
\else \a@Rfirst #1\to #2#3\fi }
\def \a@Rfirstiii #1\to #2#3{% split off leading RL space
\ifx \relax #1\relax \def #2{\relax }\def #3{\relax }%
\else \a@Rfirstii #1\to #2#3\fi }
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def \a@Ldimen {% get the dimensions of the preceding line
\setbox\a@spacebox \hbox {\arab@space}\tolerance 10000
\R@splitfalse \leavevmode
\penalty 0
\copy \a@Rdummyi \arab@space \copy \a@Rdummyii
\parfillskip \z@ plus 1fill \relax \tr@ceoff
$$\global \a@Llength \predisplaysize % dummy display
\global \a@Lwidth \displaywidth \global \a@Lindent \displayindent
\hbox to \a@Lwidth {}\postdisplaypenalty \@M
$$ {\endgraf }% keep paragraph parameters
\tr@ceon \a@lines \prevgraf \advance \a@lines -3
\prevgraf \a@lines \prevdepth -\baselineskip
\a@Ladjust % update \a@Llength and \a@Lindent
\ifinner \a@killdisplay \else \a@skipback \fi }
\def \a@Ladjust {% correct \a@Llength and \a@Lindent
\ifdim \a@Llength = \maxdimen \a@Llength \a@Lwidth % flexible line
\else \advance \a@Llength -2em \advance \a@Llength -\a@Lindent
\fi
\advance \a@Llength -\leftskip \advance \a@Llength -\wd\a@Rdummyii
\ifdim \a@Llength = \z@ \R@splittrue \a@Llength \a@Lwidth
\advance \a@Llength -\leftskip \advance \a@Llength -\rightskip
\else \advance \a@Llength -\wd\a@spacebox
\fi \advance \a@Llength -\wd\a@Rdummyi
\ifnum \prevgraf = 1
\ifdim \z@ > \hangindent \advance \a@Llength -\hangindent
\else \advance \a@Llength \hangindent
\fi
\else \ifdim \a@Llength = \z@ \R@splittrue \a@Llength \a@Lwidth
\fi
\fi }
\def \a@killdisplay {% vbox: get back to the old position
\unskip \unskip \unpenalty \setbox0 \lastbox % get rid of garbage
\ifR@split \unskip \unskip \unpenalty \setbox0 \lastbox \fi
\unskip \unskip \unpenalty \setbox0 \lastbox % last line
\dimen0 \baselineskip \advance \dimen0 -\ht0
\advance \dimen0 -\lastskip \prevdepth \dimen0
\unskip \vskip -\parskip
\noindent \unhbox0 % open and trim last line
\unskip \unskip \unpenalty \setbox0 \lastbox
\ifR@split \else \unskip \setbox0 \lastbox \fi }
\def \a@skipback {% paragraph: get back to the old position
\vskip -\belowdisplayskip \vskip -3\baselineskip
\vskip -\abovedisplayskip \vskip -\parskip
\ifR@split \ifdim \z@ > \lineskiplimit \vskip -\baselineskip \else
\vskip -\ht\a@Rdummyii \vskip -\dp\a@Rboxi \vskip -\lineskip
\fi\fi \noindent \arab@strut \nobreak \hskip \a@Llength }
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def \a@normpen #1{% prevent penalty 10000
\ifnum #1= 10000 #1= 9999 \fi }
\def \a@Rtobox #1{% pack the insertion into \Rinsertb@x
\setbox \Rinsertb@x \vbox {\a@hsize \a@Lwidth
\a@normpen \widowpenalty \a@normpen \clubpenalty
\leftskip \z@ \rightskip \z@
\parfillskip \z@ plus 1fil \relax \parskip \z@
\let \a@@kern \a@kern \let \a@@mkern \a@mkern
\def \a@kern {\nobreak \a@@kern}\def \a@mkern {\nobreak \a@@mkern}%
\let \end \relax \spreadtrue \vskip \a@vglue \hbadness 10000
\putlineb@x {\arab@strut \hskip \a@Llength }\a@spacefalse
\test@token #1 \end \unskip \unskip \vskip \a@vglue
\hbox {\box\lineb@x \hfill }}}
\def \a@Runpack {\ins@skip % unpack all lines from the insertion
\loop \a@Rgetline \unhbox \tempb@x \unskip \unskip \break
\ifvbox \Rinsertb@x \repeat \unpenalty \ins@skip }
\def \a@Rgetline {% unpack the next line globally to \box \tempb@x
{\vbadness 10000 \splittopskip \a@vglue
\dimen0 \baselineskip \advance \dimen0 1ex
\setbox \tempb@x \vsplit \Rinsertb@x to \dimen0
\setbox0 \vbox {\unvbox \tempb@x \setbox2 \lastbox \unhbox2
\unskip \unskip \unpenalty \global \setbox \tempb@x \lastbox }}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\def \a@Linsert #1{% splice Ltext into RL paragraph
\putwordb@x {\ins@skip }\a@spacefalse \a@@Linsert {#1}\a@Lunpack
\putwordb@x {\ins@skip }\a@spacetrue \arab@codes
\tracingmacros 0
\test@token }
\def \a@@Linsert #1{% splice Ltext into RL paragraph
\dimen0 \wd \lineb@x \setbox \Linsertb@x \vbox
{\hsize \a@hsize \hangindent -\dimen0 \hangafter -\@ne
\tr@ceoff \rm \tr@ceon \rightskip \z@ plus .001fil
\vskip \a@vglue \everypar {}\parskip \z@
\dimen2 \fontdimen4\font \fontdimen4\font 0pt % prevent shrinking
\noindent \null \hskip 0pt plus .001fil \relax #1
\clubpenalty 0 \widowpenalty 0 \tolerance 10000
\endgraf \fontdimen4\font \dimen2 }}
\def \a@Lunpack {% unpack all lines from the insertion
\loop \a@Lgetline \putwordb@x
{\unhbox \tempb@x \unskip \unskip }\a@spacefalse
\ifvbox \Linsertb@x \put@line \a@spacefalse \repeat }
\def \a@Lgetline {% unpack the next line globally to \box \tempb@x
{\vbadness 10000 \splittopskip \a@vglue \dimen0 \baselineskip
\setbox \tempb@x \vsplit \Linsertb@x to \dimen0
\setbox0 \vbox {\unvbox \tempb@x \global \setbox \tempb@x \lastbox }}}
%\testoutput
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\endinput
|
