summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/alephdir/ompar.ch
blob: 5e42cb64e2617d677ebb4b52d7f7d3577fdc9bcc (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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
% ompar.ch: Local paragraph information
%
% This file is part of the Omega project, which
% is based on the web2c distribution of TeX.
% 
% Copyright (c) 1994--2000 John Plaice and Yannis Haralambous
% 
% This library is free software; you can redistribute it and/or
% modify it under the terms of the GNU Library General Public
% License as published by the Free Software Foundation; either
% version 2 of the License, or (at your option) any later version.
% 
% This library is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
% Library General Public License for more details.
% 
% You should have received a copy of the GNU Library General Public
% License along with this library; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
% 
%-------------------------
@x
@p function copy_node_list(@!p:pointer):pointer; {makes a duplicate of the
  node list that starts at |p| and returns a pointer to the new list}
var h:pointer; {temporary head of copied list}
@!q:pointer; {previous position in new list}
@!r:pointer; {current node being fabricated for new list}
@!words:0..5; {number of words remaining to be copied}
@y
@p function copy_node_list(@!p:pointer):pointer; {makes a duplicate of the
  node list that starts at |p| and returns a pointer to the new list}
var h:pointer; {temporary head of copied list}
@!q:pointer; {previous position in new list}
@!r:pointer; {current node being fabricated for new list}
@!words:0..8; {number of words remaining to be copied}
@z

@x [15] m.208 l.4170
@d min_internal=char_ghost+1 {the smallest code that can follow \.{\\the}}
@y
@d assign_local_box=char_ghost+1
   {box for guillemets \.{\\localleftbox} or \.{\\localrightbox}}
@d min_internal=assign_local_box+1 {the smallest code that can follow \.{\\the}}
@z
%-------------------------
@x [16] m.212 l.4306
  @!aux_field: memory_word;
@y
  @!aux_field: memory_word;
  @!local_par_field: pointer;
  @!local_par_bool_field: boolean;
@z
%-------------------------
@x [16] m.213 l.4318
@d mode_line==cur_list.ml_field {source file line number at beginning of list}
@y
@d mode_line==cur_list.ml_field {source file line number at beginning of list}
@d local_par==cur_list.local_par_field
   {pointer to whatsit for local stuff}
@d local_par_bool==cur_list.local_par_bool_field
   {has local stuff been changed in this group?}
@z
%-------------------------
@x [16] m.215 l.4344
prev_graf:=0; shown_mode:=0;
@y
prev_graf:=0; shown_mode:=0;
local_par:=null; local_par_bool:=false;
@z
%-------------------------
@x [16] m.216 l.4351
@ When \TeX's work on one level is interrupted, the state is saved by
calling |push_nest|. This routine changes |head| and |tail| so that
a new (empty) list is begun; it does not change |mode| or |aux|.

@p procedure push_nest; {enter a new semantic level, save the old}
begin if nest_ptr>max_nest_stack then
  begin max_nest_stack:=nest_ptr;
  if nest_ptr=nest_size then overflow("semantic nest size",nest_size);
@:TeX capacity exceeded semantic nest size}{\quad semantic nest size@>
  end;
nest[nest_ptr]:=cur_list; {stack the record}
incr(nest_ptr); head:=get_avail; tail:=head; prev_graf:=0; mode_line:=line;
@y
@ @p @<LOCAL: Declare |make_local_par_node|@>;

@ When \TeX's work on one level is interrupted, the state is saved by
calling |push_nest|. This routine changes |head| and |tail| so that
a new (empty) list is begun; it does not change |mode| or |aux|.

@p procedure push_nest; {enter a new semantic level, save the old}
begin if nest_ptr>max_nest_stack then
  begin max_nest_stack:=nest_ptr;
  if nest_ptr=nest_size then overflow("semantic nest size",nest_size);
@:TeX capacity exceeded semantic nest size}{\quad semantic nest size@>
  end;
nest[nest_ptr]:=cur_list; {stack the record}
incr(nest_ptr); head:=get_avail; tail:=head; prev_graf:=0; mode_line:=line;
local_par:=make_local_par_node; local_par_bool:=false;
@z
%-------------------------
@x [16] m.217 l.4366
begin free_avail(head); decr(nest_ptr); cur_list:=nest[nest_ptr];
@y
begin
if local_par<>null then begin
  if local_par_bool then begin end {|tail_append(local_par)|}
  else free_node(local_par,local_par_size);
  end;
free_avail(head); decr(nest_ptr); cur_list:=nest[nest_ptr];
@z
%-------------------------
@x [17] m.230 l.4860
@d box_base=toks_base+number_regs {table of |number_regs| box registers}
@y
@d local_left_box_base=toks_base+number_regs
@d local_right_box_base=local_left_box_base+1
@d box_base=local_right_box_base+1 {table of |number_regs| box registers}
@z
%-------------------------
@x [17] m.230 l.4888
@d box(#)==equiv(box_base+#)
@y
@d local_left_box==equiv(local_left_box_base)
@d local_right_box==equiv(local_right_box_base)
@d box(#)==equiv(box_base+#)
@z
%-------------------------
@x [17] m.236 l.4954
@d int_pars=55 {total number of integer parameters}
@y
@d local_inter_line_penalty_code=55 {local \.{\\interlinepenalty}}
@d local_broken_penalty_code=56 {local \.{\\brokenpenalty}}
@d no_local_whatsits_code=57 {counts local whatsits}
@d int_pars=58 {total number of integer parameters}
@z
%-------------------------
@x [17] m.236 l.5011
@d new_line_char==int_par(new_line_char_code)
@y
@d new_line_char==int_par(new_line_char_code)
@d local_inter_line_penalty==int_par(local_inter_line_penalty_code)
@d local_broken_penalty==int_par(local_broken_penalty_code)
@d no_local_whatsits==int_par(no_local_whatsits_code)
@z
%-------------------------
@x [19] m.269 l.5860
@d max_group_code=16
@y
@d local_box_group=17 {code for `\.{\\localleftbox...\\localrightbox}'}
@d max_group_code=17
@z
%-------------------------
@x [38] m.814 l.15994
@!just_box:pointer; {the |hlist_node| for the last line of the new paragraph}
@y
@!just_box:pointer; {the |hlist_node| for the last line of the new paragraph}
@!internal_pen_inter:integer; {running \.{\\localinterlinepenalty}}
@!internal_pen_broken:integer; {running \.{\\localbrokenpenalty}}
@!internal_left_box:pointer; {running \.{\\localleftbox}}
@!internal_left_box_width:integer; {running \.{\\localleftbox} width}
@!init_internal_left_box:pointer; {running \.{\\localleftbox}}
@!init_internal_left_box_width:integer; {running \.{\\localleftbox} width}
@!internal_right_box:pointer; {running \.{\\localrightbox}}
@!internal_right_box_width:integer; {running \.{\\localrightbox} width}
@!temp_no_whatsits:integer; {used when closing group}

@ @<Set init...@>=
temp_no_whatsits:=0;
@z
%-------------------------
@x [38] m.821 l.16110
@ The passive node for a given breakpoint contains only four fields:

\yskip\hang|link| points to the passive node created just before this one,
if any, otherwise it is |null|.

\yskip\hang|cur_break| points to the position of this breakpoint in the
horizontal list for the paragraph being broken.

\yskip\hang|prev_break| points to the passive node that should precede this
one in an optimal path to this breakpoint.

\yskip\hang|serial| is equal to |n| if this passive node is the |n|th
one created during the current pass. (This field is used only when
printing out detailed statistics about the line-breaking calculations.)

\yskip\noindent
There is a global variable called |passive| that points to the most
recently created passive node. Another global variable, |printed_node|,
is used to help print out the paragraph when detailed information about
the line-breaking computation is being displayed.

@d passive_node_size=2 {number of words in passive nodes}
@d cur_break==rlink {in passive node, points to position of this breakpoint}
@d prev_break==llink {points to passive node that should precede this one}
@d serial==info {serial number for symbolic identification}
@y
@ The passive node for a given breakpoint contains EIGHT fields:

\yskip\hang|link| points to the passive node created just before this one,
if any, otherwise it is |null|.

\yskip\hang|cur_break| points to the position of this breakpoint in the
horizontal list for the paragraph being broken.

\yskip\hang|prev_break| points to the passive node that should precede this
one in an optimal path to this breakpoint.

\yskip\hang|serial| is equal to |n| if this passive node is the |n|th
one created during the current pass. (This field is used only when
printing out detailed statistics about the line-breaking calculations.)

\yskip\hang|passive_pen_inter| holds the current \.{\\localinterlinepenalty}

\yskip\hang|passive_pen_broken| holds the current \.{\\localbrokenpenalty}

\yskip\noindent
There is a global variable called |passive| that points to the most
recently created passive node. Another global variable, |printed_node|,
is used to help print out the paragraph when detailed information about
the line-breaking computation is being displayed.

@d passive_node_size=10 {number of words in passive nodes}
@d cur_break==rlink {in passive node, points to position of this breakpoint}
@d prev_break==llink {points to passive node that should precede this one}
@d serial==info {serial number for symbolic identification}
@d passive_pen_inter(#)==mem[#+2].int
@d passive_pen_broken(#)==mem[#+3].int
@d passive_left_box(#)==mem[#+4].int
@d passive_left_box_width(#)==mem[#+5].int
@d passive_last_left_box(#)==mem[#+6].int
@d passive_last_left_box_width(#)==mem[#+7].int
@d passive_right_box(#)==mem[#+8].int
@d passive_right_box_width(#)==mem[#+9].int
@z
%-------------------------
@x [38] m.835 l.16407
@<If a line number class...@>=
begin l:=line_number(r);
if l>old_l then
  begin {now we are no longer in the inner loop}
@y
@<If a line number class...@>=
begin l:=line_number(r);
if l>old_l then
  begin {now we are no longer in the inner loop}
@z
%-------------------------
@x [38] m.844 l.16595
@<Insert a new active node from |best_place[fit_class]| to |cur_p|@>=
begin q:=get_node(passive_node_size);
link(q):=passive; passive:=q; cur_break(q):=cur_p;
@!stat incr(pass_number); serial(q):=pass_number;@+tats@;@/
prev_break(q):=best_place[fit_class];@/
@y
@<Insert a new active node from |best_place[fit_class]| to |cur_p|@>=
begin q:=get_node(passive_node_size);
link(q):=passive; passive:=q; cur_break(q):=cur_p;
@!stat incr(pass_number); serial(q):=pass_number;@+tats@;@/
prev_break(q):=best_place[fit_class];@/
{Here we keep track of the subparagraph penalties in the break nodes}
passive_pen_inter(q):=internal_pen_inter;
passive_pen_broken(q):=internal_pen_broken;
passive_last_left_box(q):=internal_left_box;
passive_last_left_box_width(q):=internal_left_box_width;
if prev_break(q)<>null then begin
  passive_left_box(q):=passive_last_left_box(prev_break(q));
  passive_left_box_width(q):=passive_last_left_box_width(prev_break(q));
  end
else begin
  passive_left_box(q):=init_internal_left_box;
  passive_left_box_width(q):=init_internal_left_box_width;
  end;
passive_right_box(q):=internal_right_box;
passive_right_box_width(q):=internal_right_box_width;
@z
%-------------------------
@x [38] m.851 l.16706
@<Consider the demerits for a line from |r| to |cur_p|...@>=
begin artificial_demerits:=false;@/
@^inner loop@>
shortfall:=line_width-cur_active_width[1]; {we're this much too short}
@y
@<Consider the demerits for a line from |r| to |cur_p|...@>=
begin artificial_demerits:=false;@/
@^inner loop@>
shortfall:=line_width-cur_active_width[1]; {we're this much too short}
if break_node(r)=null then
  shortfall:=shortfall-init_internal_left_box_width
else shortfall:=shortfall-passive_last_left_box_width(break_node(r));
shortfall:=shortfall-internal_right_box_width;
@z
%-------------------------
@x [39] m.863 l.16932
loop@+  begin if threshold>inf_bad then threshold:=inf_bad;
  if second_pass then @<Initialize for hyphenating a paragraph@>;
  @<Create an active breakpoint representing the beginning of the paragraph@>;
  cur_p:=link(temp_head); auto_breaking:=true;@/
  prev_p:=cur_p; {glue at beginning is not a legal breakpoint}
@y
loop@+  begin if threshold>inf_bad then threshold:=inf_bad;
  if second_pass then @<Initialize for hyphenating a paragraph@>;
  @<Create an active breakpoint representing the beginning of the paragraph@>;
  cur_p:=link(temp_head); auto_breaking:=true;@/
  prev_p:=cur_p; {glue at beginning is not a legal breakpoint}
  @<LOCAL: Initialize with first |local_paragraph| node@>;
@z
%-------------------------
@x [39] m.877 l.17206
procedure post_line_break(@!final_widow_penalty:integer);
label done,done1;
@y
procedure post_line_break(@!final_widow_penalty:integer);
label done,done1;
@z
%-------------------------
@x [39] m.879 l.17257
  if non_discardable(q) then goto done1;
  if type(q)=kern_node then if subtype(q)<>explicit then goto done1;
@y
  if @<LOCAL: local paragraph node@> then begin end
  else begin
    if non_discardable(q) then goto done1;
    if type(q)=kern_node then if subtype(q)<>explicit then goto done1;
    end;
@z
%-------------------------
@x [39] m.881 l.17289
q:=cur_break(cur_p); disc_break:=false; post_disc_break:=false;
if q<>null then {|q| cannot be a |char_node|}
  if type(q)=glue_node then
    begin delete_glue_ref(glue_ptr(q));
    glue_ptr(q):=right_skip;
    subtype(q):=right_skip_code+1; add_glue_ref(right_skip);
    goto done;
    end
  else  begin if type(q)=disc_node then
      @<Change discretionary to compulsory and set
        |disc_break:=true|@>
    else if (type(q)=math_node)or(type(q)=kern_node) then width(q):=0;
    end
else  begin q:=temp_head;
  while link(q)<>null do q:=link(q);
  end;
@<Put the \(r)\.{\\rightskip} glue after node |q|@>;
@y
q:=cur_break(cur_p); disc_break:=false; post_disc_break:=false;
if q<>null then {|q| cannot be a |char_node|}
  if type(q)=glue_node then begin
    if passive_right_box(cur_p)<>null then begin
      r:=temp_head;
      while link(r)<>q do r:=link(r);
      s:=copy_node_list(passive_right_box(cur_p));
      link(r):=s;
      link(s):=q;
      end;
    delete_glue_ref(glue_ptr(q));
    glue_ptr(q):=right_skip;
    subtype(q):=right_skip_code+1; add_glue_ref(right_skip);
    goto done;
    end
  else  begin if type(q)=disc_node then
      @<Change discretionary to compulsory and set
        |disc_break:=true|@>
    else if (type(q)=math_node)or(type(q)=kern_node) then width(q):=0;
    end
else  begin q:=temp_head;
  while link(q)<>null do q:=link(q);
  end;
if passive_right_box(cur_p)<>null then begin
  r:=copy_node_list(passive_right_box(cur_p));
  link(r):=link(q);
  link(q):=r;
  q:=r;
  end;
@<Put the \(r)\.{\\rightskip} glue after node |q|@>;
@z
%-------------------------
@x [39] m.887 l.17352
@<Put the \(l)\.{\\leftskip} glue at the left...@>=
r:=link(q); link(q):=null; q:=link(temp_head); link(temp_head):=r;
if left_skip<>zero_glue then
  begin r:=new_param_glue(left_skip_code);
  link(r):=q; q:=r;
  end
@y
@<Put the \(l)\.{\\leftskip} glue at the left...@>=
r:=link(q); link(q):=null; q:=link(temp_head); link(temp_head):=r;
if passive_left_box(cur_p)<>null then begin
  r:=copy_node_list(passive_left_box(cur_p));
  s:=link(q);
  link(r):=q;
  q:=r;
  if (cur_line=prev_graf+1) and (s<>null) then
    if type(s)=hlist_node then
      if list_ptr(s)=null then begin
        q:=link(q);
        link(r):=link(s);
        link(s):=r;
        end;
  end;
if left_skip<>zero_glue then
  begin r:=new_param_glue(left_skip_code);
  link(r):=q; q:=r;
  end
@z
%-------------------------
@x [39] m.890 l.17391
@<Append a penalty node, if a nonzero penalty is appropriate@>=
if cur_line+1<>best_line then
  begin pen:=inter_line_penalty;
  if cur_line=prev_graf+1 then pen:=pen+club_penalty;
  if cur_line+2=best_line then pen:=pen+final_widow_penalty;
  if disc_break then pen:=pen+broken_penalty;
@y
@<Append a penalty node, if a nonzero penalty is appropriate@>=
if cur_line+1<>best_line then begin
  if passive_pen_inter(cur_p)<>0 then
      pen:=passive_pen_inter(cur_p)
  else pen:=inter_line_penalty;
  if cur_line=prev_graf+1 then pen:=pen+club_penalty;
  if cur_line+2=best_line then pen:=pen+final_widow_penalty;
  if disc_break then
    if passive_pen_broken(cur_p)<>0 then
      pen:=pen+passive_pen_broken(cur_p)
    else pen:=pen+broken_penalty;
@z
%-------------------------
@x [47] m.1063 l.20580
non_math(left_brace): new_save_level(simple_group);
any_mode(begin_group): new_save_level(semi_simple_group);
any_mode(end_group): if cur_group=semi_simple_group then unsave
  else off_save;
@y
non_math(left_brace): begin
  new_save_level(simple_group);
  eq_word_define(int_base+no_local_whatsits_code,0);
  end;
any_mode(begin_group): begin
  new_save_level(semi_simple_group);
  eq_word_define(int_base+no_local_whatsits_code,0);
  end;
any_mode(end_group):
  if cur_group=semi_simple_group then begin
    temp_no_whatsits:=no_local_whatsits;
    unsave;
    if temp_no_whatsits<>0 then
      if abs(mode)=hmode then @<LOCAL: Add local paragraph node@>;
    end
  else off_save;
@z
%-------------------------
@x [47] m.1068 l.20653
procedure handle_right_brace;
var p,@!q:pointer; {for short-term use}
@!d:scaled; {holds |split_max_depth| in |insert_group|}
@!f:integer; {holds |floating_penalty| in |insert_group|}
begin case cur_group of
simple_group: unsave;
@y
procedure handle_right_brace;
var p,@!q:pointer; {for short-term use}
@!d:scaled; {holds |split_max_depth| in |insert_group|}
@!f:integer; {holds |floating_penalty| in |insert_group|}
begin case cur_group of
simple_group: begin
  temp_no_whatsits:=no_local_whatsits;
  unsave;
  if temp_no_whatsits<>0 then
    if abs(mode)=hmode then @<LOCAL: Add local paragraph node@>;
  end;
@z
%-------------------------
@x [47] m.1091 l.21055
push_nest; mode:=hmode; space_factor:=1000; set_cur_lang; clang:=cur_lang;
prev_graf:=(norm_min(left_hyphen_min)*@'100+norm_min(right_hyphen_min))
             *@'200000+cur_lang;
if indented then
  begin tail:=new_null_box; link(head):=tail; width(tail):=par_indent;@+
  end;
@y
push_nest; mode:=hmode; space_factor:=1000; set_cur_lang; clang:=cur_lang;
prev_graf:=(norm_min(left_hyphen_min)*@'100+norm_min(right_hyphen_min))
             *@'200000+cur_lang;
@<LOCAL: Add local paragraph node@>;
if indented then begin
  tail:=new_null_box; link(link(head)):=tail; width(tail):=par_indent;@+
  end;
@z
%-------------------------
@x [47] m.1096 l.21116
procedure end_graf;
begin if mode=hmode then
  begin if head=tail then pop_nest {null paragraphs are ignored}
@y
procedure end_graf;
begin if mode=hmode then
  begin if (head=tail) or (link(head)=tail) then pop_nest
        {null paragraphs are ignored, all contain a |local_paragraph| node}
@z
%-------------------------
@x [47] m.1114 l.21322
primitive("-",discretionary,1);
@!@:Single-character primitives -}{\quad\.{\\-}@>
primitive("discretionary",discretionary,0);
@!@:discretionary_}{\.{\\discretionary} primitive@>

@ @<Cases of |print_cmd_chr|...@>=
discretionary: if chr_code=1 then
  print_esc("-")@+else print_esc("discretionary");

@ @<Cases of |main_control| that build...@>=
hmode+discretionary,mmode+discretionary: append_discretionary;
@y
primitive("-",discretionary,1);
@!@:Single-character primitives -}{\quad\.{\\-}@>
primitive("discretionary",discretionary,0);
@!@:discretionary_}{\.{\\discretionary} primitive@>
primitive("localleftbox",assign_local_box,0);
@!@:assign_local_box}{\.{\\localleftbox} primitive@>
primitive("localrightbox",assign_local_box,1);
@!@:assign_local_box}{\.{\\localrightbox} primitive@>

@ @<Cases of |print_cmd_chr|...@>=
discretionary: if chr_code=1 then
  print_esc("-")@+else print_esc("discretionary");
assign_local_box: if chr_code=0 then print_esc("localleftbox")
                  else print_esc("localrightbox");

@ @<Cases of |main_control| that build...@>=
hmode+discretionary,mmode+discretionary: append_discretionary;
any_mode(assign_local_box): append_local_box(cur_chr);
@z
%-------------------------
@x [47] m.1117 l.21338
procedure append_discretionary;
@y
procedure append_local_box(kind:integer);
begin 
incr(save_ptr); saved(-1):=kind; new_save_level(local_box_group);
scan_left_brace; push_nest; mode:=-hmode; space_factor:=1000;
end;

procedure append_discretionary;
@z
%-------------------------
@x [47] m.1118 l.21355
disc_group: build_discretionary;
@y
disc_group: build_discretionary;
local_box_group: build_local_box;
@z
%-------------------------
@x [47] m.1119 l.21358
procedure build_discretionary;
@y
procedure build_local_box;
var p:pointer;
    kind:integer;
begin
unsave;
kind:=saved(-1);
decr(save_ptr);
p:=link(head); pop_nest;
p:=hpack(p,natural);
if kind=0 then
  eq_define(local_left_box_base,box_ref,p)
else
  eq_define(local_right_box_base,box_ref,p);
if abs(mode)=hmode then
  @<LOCAL: Add local paragraph node@>;
eq_word_define(int_base+no_local_whatsits_code,no_local_whatsits+1);
end;

procedure build_discretionary;
@z
%-------------------------
@x [47] m.1200 l.22453
procedure resume_after_display;
begin if cur_group<>math_shift_group then confusion("display");
@:this can't happen display}{\quad display@>
unsave; prev_graf:=prev_graf+3;
push_nest; mode:=hmode; space_factor:=1000; set_cur_lang; clang:=cur_lang;
prev_graf:=(norm_min(left_hyphen_min)*@'100+norm_min(right_hyphen_min))
             *@'200000+cur_lang;
@y
procedure resume_after_display;
begin if cur_group<>math_shift_group then confusion("display");
@:this can't happen display}{\quad display@>
unsave; prev_graf:=prev_graf+3;
push_nest; mode:=hmode; space_factor:=1000; set_cur_lang; clang:=cur_lang;
prev_graf:=(norm_min(left_hyphen_min)*@'100+norm_min(right_hyphen_min))
             *@'200000+cur_lang;
@<LOCAL: Add local paragraph node@>;
@z
%-------------------------
@x [49] m.1228 l.22908
assign_int: begin p:=cur_chr; scan_optional_equals; scan_int;
  word_define(p,cur_val);
@y
assign_int: begin p:=cur_chr; scan_optional_equals; scan_int;
  word_define(p,cur_val);
{If we are defining subparagraph penalty levels while we are
in hmode, then we put out a whatsit immediately, otherwise
we leave it alone.  This mechanism might not be sufficiently
powerful, and some other algorithm, searching down the stack,
might be necessary.  Good first step.}
  if (abs(mode)=hmode) and
     ((p=(int_base+local_inter_line_penalty_code)) or
      (p=(int_base+local_broken_penalty_code))) then begin
    @<LOCAL: Add local paragraph node@>;
    eq_word_define(int_base+no_local_whatsits_code,no_local_whatsits+1);
    local_par_bool:=true;
    end;
@z
%-------------------------
@x [53] m.1344 l.24533
@d set_language_code=5 {command modifier for \.{\\setlanguage}}
@y
@d set_language_code=5 {command modifier for \.{\\setlanguage}}
@d local_par_node=6 {|subtype| in whatsits for local paragraph node}
@z
%-------------------------
@x [53] m.1344 l.24546
primitive("setlanguage",extension,set_language_code);@/
@!@:set_language_}{\.{\\setlanguage} primitive@>
@y
primitive("setlanguage",extension,set_language_code);@/
@!@:set_language_}{\.{\\setlanguage} primitive@>
primitive("localinterlinepenalty",assign_int,local_inter_line_penalty_code);@/
primitive("localbrokenpenalty",assign_int,local_broken_penalty_code);@/
@z
%-------------------------
@x [53] m.1356 l.24660
language_node:begin print_esc("setlanguage");
  print_int(what_lang(p)); print(" (hyphenmin ");
  print_int(what_lhm(p)); print_char(",");
  print_int(what_rhm(p)); print_char(")");
  end;
@y4
language_node:begin print_esc("setlanguage");
  print_int(what_lang(p)); print(" (hyphenmin ");
  print_int(what_lhm(p)); print_char(",");
  print_int(what_rhm(p)); print_char(")");
  end;
@<LOCAL: print out |local_paragraph| node@>;
@z
%-------------------------
@x [53] m.1357 l.24685
othercases confusion("ext2")
@y
local_par_node: begin r:=get_node(local_par_size);
  words:=local_par_size;
  end;
othercases confusion("ext2")
@z
%-------------------------
@x [53] m.1358 l.24696
othercases confusion("ext3")
@y
local_par_node: free_node(p,local_par_size);
othercases confusion("ext3")
@z
%-------------------------
@x [53] m.1362 l.24711
@<Advance \(p)past a whatsit node in the \(l)|line_break| loop@>=@+
adv_past(cur_p)
@y
@<Advance \(p)past a whatsit node in the \(l)|line_break| loop@>=@+
adv_past(cur_p) else @<LOCAL: Advance past a |local_paragraph| node@>
@z
%-------------------------
@x [53] m.1373 l.24820
procedure out_what(@!p:pointer);
var j:small_number; {write stream number}
begin case subtype(p) of
open_node,write_node,close_node:@<Do some work that has been queued up
  for \.{\\write}@>;
special_node:special_out(p);
language_node:do_nothing;
othercases confusion("ext4")
@y
procedure out_what(@!p:pointer);
var j:small_number; {write stream number}
begin case subtype(p) of
open_node,write_node,close_node:@<Do some work that has been queued up
  for \.{\\write}@>;
special_node:special_out(p);
language_node:do_nothing;
local_par_node:do_nothing;
othercases confusion("ext4")
@z
%-------------------------
@x [53] m.1378 l.24900
@ @<Finish the extensions@>=
for k:=0 to 15 do if write_open[k] then a_close(write_file[k])
@y
@ @<Finish the extensions@>=
for k:=0 to 15 do if write_open[k] then a_close(write_file[k])

@ 
@d local_pen_inter(#)==mem[#+1].int {\.{\\localinterlinepenalty}}
@d local_pen_broken(#)==mem[#+2].int {\.{\\localbrokenpenalty}}
@d local_box_left(#)==mem[#+3].int {\.{\\localleftbox}}
@d local_box_left_width(#)==mem[#+4].int
@d local_box_right(#)==mem[#+5].int {\.{\\localleftbox}}
@d local_box_right_width(#)==mem[#+6].int
@d local_par_size==7

@<LOCAL: Declare |make_local_par_node|@>=
function make_local_par_node:pointer;
{This function creates a |local_paragraph| node}
var p:pointer;
begin
p:=get_node(local_par_size); type(p):=whatsit_node;
subtype(p):=local_par_node; link(p):=null;
local_pen_inter(p):=local_inter_line_penalty;
local_pen_broken(p):=local_broken_penalty;
if local_left_box=null then begin
  local_box_left(p):=null;
  local_box_left_width(p):=0;
  end
else begin
  local_box_left(p):=copy_node_list(local_left_box);
  local_box_left_width(p):=width(local_left_box);
  end;
if local_right_box=null then begin
  local_box_right(p):=null;
  local_box_right_width(p):=0;
  end
else begin
  local_box_right(p):=copy_node_list(local_right_box);
  local_box_right_width(p):=width(local_right_box);
  end;
make_local_par_node:=p;
end

@ @<LOCAL: Initialize with first |local_paragraph| node@>=
if subtype(cur_p)=local_par_node then begin
  internal_pen_inter:=local_pen_inter(cur_p);
  internal_pen_broken:=local_pen_broken(cur_p);
  init_internal_left_box:=local_box_left(cur_p);
  init_internal_left_box_width:=local_box_left_width(cur_p);
  internal_left_box:=init_internal_left_box;
  internal_left_box_width:=init_internal_left_box_width;
  internal_right_box:=local_box_right(cur_p);
  internal_right_box_width:=local_box_right_width(cur_p);
  end

@ @<LOCAL: Advance past a |local_paragraph| node@>=
if subtype(cur_p)=local_par_node then begin
  internal_pen_inter:=local_pen_inter(cur_p);
  internal_pen_broken:=local_pen_broken(cur_p);
  internal_left_box:=local_box_left(cur_p);
  internal_left_box_width:=local_box_left_width(cur_p);
  internal_right_box:=local_box_right(cur_p);
  internal_right_box_width:=local_box_right_width(cur_p);
  end

@ @<LOCAL: print out |local_paragraph| node@>=
local_par_node: begin
  print_esc("whatsit");
  append_char(".");
  print_ln; print_current_string;
  print_esc("localinterlinepenalty"); print("=");
  print_int(local_pen_inter(p));
  print_ln; print_current_string;
  print_esc("localbrokenpenalty"); print("=");
  print_int(local_pen_broken(p));
  print_ln; print_current_string;
  print_esc("localleftbox");
  if local_box_left(p)=null then print("=null")
  else begin
    append_char(".");
    show_node_list(local_box_left(p));
    decr(pool_ptr);
    end;
  print_ln; print_current_string;
  print_esc("localrightbox");
  if local_box_right(p)=null then print("=null")
  else begin
    append_char(".");
    show_node_list(local_box_right(p));
    decr(pool_ptr);
    end;
  decr(pool_ptr);
  end

@ @<LOCAL: Add local paragraph node@>=
begin tail_append(make_local_par_node) end

@ @<LOCAL: local paragraph node@>=
((type(q)=whatsit_node) and (subtype(q)=local_par_node))

@z
%-------------------------