Documentation Source Text

Check-in [b1e7df7e11]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Attempt to provide a renderer for the bubble syntax that produces all text output for users not wanting the graphical version.
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: b1e7df7e1198e1513c7c2540e7cca7e5576752f1
User & Date: shaneh 2010-03-23 21:39:07
Context
2010-03-24
03:36
Minor updates to text based syntax generator to support IE8. Unfortunately, IE8 doesn't support radius styles on tables. check-in: 4f317a713b user: shaneh tags: trunk
2010-03-23
21:39
Attempt to provide a renderer for the bubble syntax that produces all text output for users not wanting the graphical version. check-in: b1e7df7e11 user: shaneh tags: trunk
13:12
Update the file format documentation to show that the database size is stored in the header at offset 28. check-in: 2ceac5efd8 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Added art/syntax/bubble-generator-text.tcl.



















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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
#!/bin/tclsh
#
# Run this TCL script to generate syntax bubble diagrams from
# text descriptions.
#
# This version generates a pure HTML table based version with
# no graphics, all in one file named "all-text.html".  It may
# be useful to people wanting text search or screen reader 
# support.

# Graphs:
#
set all_graphs {
  sql-stmt-list {
    toploop {optx sql-stmt} ;
  }
  sql-stmt {
    line
      {opt EXPLAIN {opt QUERY PLAN}}
      {or
         alter-table-stmt
         analyze-stmt
         attach-stmt
         begin-stmt
         commit-stmt
         create-index-stmt
         create-table-stmt
         create-trigger-stmt
         create-view-stmt
         create-virtual-table-stmt
         delete-stmt
         delete-stmt-limited
         detach-stmt
         drop-index-stmt
         drop-table-stmt
         drop-trigger-stmt
         drop-view-stmt
         insert-stmt
         pragma-stmt
         reindex-stmt
         release-stmt
         rollback-stmt
         savepoint-stmt
         select-stmt
         update-stmt
         update-stmt-limited
         vacuum-stmt
      }
  }
  alter-table-stmt {
    stack
       {line ALTER TABLE {optx /database-name .} /table-name}
       {tailbranch
          {line RENAME TO /new-table-name}
          {line ADD {optx COLUMN} column-def}
       }
  }
  analyze-stmt {
     line ANALYZE {or nil /database-name /table-name
                    {line /database-name . /table-name}}
  }
  attach-stmt {
     line ATTACH {or DATABASE nil} /filename AS /database-name
  }
  begin-stmt {
     line BEGIN {or nil DEFERRED IMMEDIATE EXCLUSIVE}
          {optx TRANSACTION}
  }
  commit-stmt {
     line {or COMMIT END} {optx TRANSACTION}
  }
  rollback-stmt {
     line ROLLBACK {optx TRANSACTION}
        {optx TO {optx SAVEPOINT} /savepoint-name}
  }
  savepoint-stmt {
     line SAVEPOINT /savepoint-name
  }
  release-stmt {
     line RELEASE {optx SAVEPOINT} /savepoint-name
  }
  create-index-stmt {
    stack
       {line CREATE {opt UNIQUE} INDEX {opt IF NOT EXISTS}}
       {line {optx /database-name .} /index-name
             ON /table-name ( {loop indexed-column ,} )}
  }
  indexed-column {
      line /column-name {optx COLLATE /collation-name} {or ASC DESC nil} 
  }
  create-table-stmt {
    stack
       {line CREATE {or {} TEMP TEMPORARY} TABLE {opt IF NOT EXISTS}}
       {line {optx /database-name .} /table-name
          {tailbranch
            {line ( {loop column-def ,} {loop {} {, table-constraint}} )}
            {line AS select-stmt}
          }
       }
  }
  column-def {
    line /column-name {or type-name nil} {loop nil {nil column-constraint nil}}
  }
  type-name {
     line {loop /name {}} {or {}
        {line ( signed-number )}
        {line ( signed-number , signed-number )}
     }
  }
  column-constraint {
    stack
      {optx CONSTRAINT /name}
      {or
         {line PRIMARY KEY {or nil ASC DESC} 
               conflict-clause {opt AUTOINCREMENT}
         }
         {line NOT NULL conflict-clause}
         {line UNIQUE conflict-clause}
         {line CHECK ( expr )}
         {line DEFAULT 
            {or
                signed-number
                literal-value
                {line ( expr )}
            }
         }
         {line COLLATE /collation-name}
         {line foreign-key-clause}
      }
  }
  signed-number {
     line
        {or nil + -}
        {or /integer-literal /floating-point-literal}
  }
  table-constraint {
     stack
       {optx CONSTRAINT /name}
       {or
          {line {or {line PRIMARY KEY} UNIQUE}
                ( {loop indexed-column ,} ) conflict-clause}
          {line CHECK ( expr )}
          {line FOREIGN KEY ( {loop /column-name ,} ) foreign-key-clause }
       }
  }
  foreign-key-clause {
      stack 
        {line REFERENCES /foreign-table {optx ( {loop /column-name ,} )}}
        {optx 
          {loop
             {or 
                {line ON {or DELETE UPDATE}
                         {or {line SET NULL} {line SET DEFAULT}
                             CASCADE RESTRICT {line NO ACTION}
                         }
                }
                {line MATCH /name}
             }
             {}
          }
        }
        {optx
          {line {optx NOT} DEFERRABLE 
             {or 
                {line INITIALLY DEFERRED}
                {line INITIALLY IMMEDIATE}
                {}
             }
          }
          nil
        }
  }
  conflict-clause {
    opt {line ON CONFLICT {or ROLLBACK ABORT FAIL IGNORE REPLACE}}
  }
  create-trigger-stmt {
    stack
       {line CREATE {or {} TEMP TEMPORARY} TRIGGER {opt IF NOT EXISTS}}
       {line {optx /database-name .} /trigger-name
             {or BEFORE AFTER {line INSTEAD OF} nil}
       }
       {line
             {or DELETE INSERT 
                 {line UPDATE {opt OF {loop /column-name ,} }}
             }
             ON /table-name
       }
       {line {optx FOR EACH ROW}
             {optx WHEN expr}
       }
       {line BEGIN
             {loop 
                {line {or update-stmt insert-stmt delete-stmt select-stmt} ;} 
                nil
             }
             END
       }
  }
  create-view-stmt {
    stack
       {line CREATE {or {} TEMP TEMPORARY} VIEW {opt IF NOT EXISTS}}
       {line {optx /database-name .} /view-name AS select-stmt}
  }
  create-virtual-table-stmt {
    stack
       {line CREATE VIRTUAL TABLE {optx /database-name .} /table-name}
       {line USING /module-name {optx ( {loop module-argument ,} )}}
  }
  delete-stmt {
    line DELETE FROM qualified-table-name {optx WHERE expr}
  }
  delete-stmt-limited {
    stack
        {line DELETE FROM qualified-table-name {optx WHERE expr}}
        {optx
            {stack
              {optx ORDER BY {loop ordering-term ,}}
              {line LIMIT /integer {optx {or OFFSET ,} /integer}}
            }
        }
  }
  detach-stmt {
    line DETACH {optx DATABASE} /database-name
  }
  drop-index-stmt {
    line DROP INDEX {optx IF EXISTS} {optx /database-name .} /index-name
  }
  drop-table-stmt {
    line DROP TABLE {optx IF EXISTS} {optx /database-name .} /table-name
  }
  drop-trigger-stmt {
    line DROP TRIGGER {optx IF EXISTS} {optx /database-name .} /trigger-name
  }
  drop-view-stmt {
    line DROP VIEW {optx IF EXISTS} {optx /database-name .} /view-name
  }
  expr {
    or
     {line literal-value}
     {line bind-parameter}
     {line {optx {optx /database-name .} /table-name .} /column-name}
     {line /unary-operator expr}
     {line expr /binary-operator expr}
     {line /function-name ( {or {line {optx DISTINCT} {toploop expr ,}} {} *} )}
     {line ( expr )}
     {line CAST ( expr AS type-name )}
     {line expr COLLATE /collation-name}
     {line expr {optx NOT} {or LIKE GLOB REGEXP MATCH} expr
           {optx ESCAPE expr}}
     {line expr {or ISNULL NOTNULL {line NOT NULL}}}
     {line expr IS {optx NOT} expr}
     {line expr {optx NOT} BETWEEN expr AND expr}
     {line expr {optx NOT} IN 
            {or
               {line ( {or {} select-stmt {loop expr ,}} )}
               {line {optx /database-name .} /table-name}
            }
     }
     {line {optx {optx NOT} EXISTS} ( select-stmt )}
     {line CASE {optx expr} {loop {line WHEN expr THEN expr} {}}
           {optx ELSE expr} END}
     {line raise-function}
  }
  raise-function {
     line RAISE ( 
           {or IGNORE
               {line {or ROLLBACK ABORT FAIL} , /error-message }
           } )
  }
  literal-value {
    or
     {line /integer-literal}
     {line /floating-point-literal}
     {line /string-literal}
     {line /blob-literal}
     {line NULL}
     {line CURRENT_TIME}
     {line CURRENT_DATE}
     {line CURRENT_TIMESTAMP}
  }
  insert-stmt {
    stack
       {line
          {or 
              {line INSERT {opt OR {or ROLLBACK ABORT REPLACE FAIL IGNORE}}}
              REPLACE
          }
          INTO {optx /database-name .} /table-name
       }
       {tailbranch
          {line 
                {optx ( {loop /column-name ,} )}
                {tailbranch
                    {line VALUES ( {loop expr ,} )}
                    select-stmt
                }
          }
          {line DEFAULT VALUES}
       }
  }
  pragma-stmt {
     line PRAGMA {optx /database-name .} /pragma-name
          {or
              nil
              {line = pragma-value}
              {line ( pragma-value )}
          }
  }
  pragma-value {
     or
        signed-number
        /name
        /string-literal
  }
  reindex-stmt {
     line REINDEX
          {tailbranch
             /collation-name
             {line {optx /database-name .}
                 {tailbranch /table-name /index-name}
             }
          }
  }
  select-stmt {
    stack
       {loop {line select-core nil} {nil compound-operator nil}}
       {optx ORDER BY {loop ordering-term ,}}
       {optx LIMIT /integer {optx {or OFFSET ,} /integer}}
  }
  select-core {
     stack
       {line SELECT {or nil DISTINCT ALL} {loop result-column ,}}
       {optx FROM join-source}
       {optx WHERE expr}
       {optx GROUP BY {loop ordering-term ,} {optx HAVING expr}}
        
  }
  result-column {
     or
        *
        {line /table-name . *}
        {line expr {optx {optx AS} /column-alias}}
  }
  join-source {
     line
        single-source
        {opt {loop {line nil join-op single-source join-constraint nil} {}}}
  }
  single-source {
     or
       {line
          {optx /database-name .} /table-name
          {optx {optx AS} /table-alias}
          {or nil {line INDEXED BY /index-name} {line NOT INDEXED}}
       }
       {line
          ( select-stmt ) {optx {optx AS} /table-alias}
       }
       {line ( join-source )}
  }
  join-op {
     or
        {line ,}
        {line
            {opt NATURAL}
            {or {line {opt LEFT} {opt OUTER}} INNER CROSS}
            JOIN
        }
  }
  join-constraint {
     or
        {line ON expr}
        {line USING ( {loop /column-name ,} )}
        nil
  }
  ordering-term {
      line expr {opt COLLATE /collation-name} {or nil ASC DESC} 
  }
  compound-operator {
     or {line UNION {optx ALL}} INTERSECT EXCEPT
  }
  update-stmt {
     stack
        {line UPDATE {opt OR {or ROLLBACK ABORT REPLACE FAIL IGNORE}}
              qualified-table-name}
        {line SET {loop {line /column-name = expr} ,} {optx WHERE expr}}
  }
  update-stmt-limited {
     stack
        {line UPDATE {opt OR {or ROLLBACK ABORT REPLACE FAIL IGNORE}}
              qualified-table-name}
        {line SET {loop {line /column-name = expr} ,} {optx WHERE expr}}
        {optx
            {stack
              {optx ORDER BY {loop ordering-term ,}}
              {line LIMIT /integer {optx {or OFFSET ,} /integer}}
            }
        }
  }
  qualified-table-name {
     line {optx /database-name .} /table-name
          {or nil {line INDEXED BY /index-name} {line NOT INDEXED}}
  }
  vacuum-stmt {
      line VACUUM
  }
  comment-syntax {
    or
      {line -- {loop nil /anything-except-newline} 
           {or /newline /end-of-input}}
      {line /* {loop nil /anything-except-*/}
           {or */ /end-of-input}}
  }
}

# used for curves
set rad "4px"
# used for bubble text
set font1 "8px"
# used for arrows
set font2 "12px"
# used for 
set font3 "14px"

# |
set c9474 "<table><tr><td class=\"rside\"></td><td class=\"empty\"></td></tr><tr><td class=\"rside\"></td><td class=\"empty\"></td></tr></table>"
# -|
set c9488 "<table><tr><td class=\"empty\"></td><td class=\"empty\"></td></tr><tr><td class=\"top\"></td><td class=\"lside\"></td></tr></table>"
# |-
set c9484 "<table><tr><td class=\"empty\"></td><td class=\"bottom\"></td></tr><tr><td class=\"rside\"></td><td class=\"empty\"></td></tr></table>"
# |_
set c9492 "<table><tr><td class=\"empty\"></td><td class=\"lside\"></td></tr><tr><td class=\"empty\"></td><td class=\"top\"></td></tr></table>"
# _|
set c9496 "<table><tr><td class=\"bottom\"></td><td class=\"lside\"></td></tr><tr><td class=\"empty\"></td><td class=\"empty\"></td></tr></table>"
#--( top left
set c9581  "<table><tr><td class=\"bottom\"></td><td class=\"bottom\"></td></tr><tr><td class=\"empty\"></td><td class=\"empty\" style=\"border-top-style:solid; border-left-style:solid; border-width:1px; border-top-left-radius:$rad; -moz-border-radius-topleft:$rad; -webkit-border-top-left-radius:$rad;\"></td></tr></table>"
#-|-
set c9516  "<table><tr><td class=\"bottom\"></td><td class=\"bottom\"></td></tr><tr><td class=\"rside\"></td><td class=\"empty\"></td></tr></table>"
#( bot left
set c9584  "<table><tr><td class=\"empty\"></td><td class=\"empty\" style=\"border-bottom-style:solid; border-left-style:solid; border-width:1px; border-bottom-left-radius:$rad; -moz-border-radius-bottomleft:$rad; -webkit-border-bottom-left-radius:$rad;\"></td></tr><tr><td class=\"empty\"></td><td class=\"empty\"></td></tr></table>"
# ) bot right
set c9583  "<table><tr><td class=\"empty\" style=\"border-bottom-style:solid; border-right-style:solid; border-width:1px; border-bottom-right-radius:$rad; -moz-border-radius-bottomright:$rad; -webkit-border-bottom-right-radius:$rad;\"></td><td class=\"empty\"></td></tr><tr><td class=\"empty\"></td><td class=\"empty\"></td></tr></table>"
# |-
set c9500 "<table><tr><td class=\"rside\"></td><td class=\"bottom\"></td></tr><tr><td class=\"rside\"></td><td class=\"empty\"></td></tr></table>"
# -|
set c9508 "<table><tr><td class=\"bottom\"></td><td class=\"lside\"></td></tr><tr><td class=\"empty\"></td><td class=\"lside\"></td></tr></table>"
#->
set rarr  "<table><tr><td class=\"bottom\"></td><td rowspan=2 style=\"vertical-align:middle; font-size:$font2;\">&gt;</td></tr><tr><td class=\"empty\"></td></tr></table>"
# <-
set larr  "<table><tr><td rowspan=2 style=\"vertical-align:middle; font-size:$font2;\">&lt;</td><td class=\"bottom\"></td></tr><tr><td class=\"empty\"></td></tr></table>"
# ---
set hr  "<table width=100%><tr><td class=\"bottom\"></td></tr><tr><td class=\"empty\"></td></tr></table>"


# Draw a bubble containing $txt. 
#
proc draw_bubble {txt} {
  global c9474 c9488 c9484 c9492 c9496 c9581 c9516 c9584 c9583 c9500 c9508 rarr larr hr

  if {$txt=="nil"} {
    return [list 1 "<table><tr><td width=100%>$hr</td></tr></table>"]
  } elseif {$txt=="bullet"} {
    return [list 1 "<table><tr><td>&otimes;</td></tr></table>"]
  }

  if {[regexp {^/[a-z]} $txt]} {
    set txt [string range $txt 1 end]
    set istoken 1
  } elseif {[regexp {^[a-z]} $txt]} {
    set istoken 0
  } else {
    set istoken 1
  }

  set txt "&nbsp;$txt&nbsp;"

  if {$istoken} {
    return [list 1 "<table><tr><td class=\"round\">$txt</td></tr></table>"]
  } else {
    return [list 1 "<table><tr><td class=\"square\">$txt</td></tr></table>"]
  }

  return [list 0 ""]
}

# Draw a sequence of terms from left to write.  Each element of $lx
# descripts a single term.
#
proc draw_line {lx} {
  global c9474 c9488 c9484 c9492 c9496 c9581 c9516 c9584 c9583 c9500 c9508 rarr larr hr

  set n [llength $lx]

  set h 1
  set content ""
  set i 0
  foreach term $lx {
    incr i

    set rc [draw_diagram $term]
    set th [lindex $rc 0]
    set tcontent [lindex $rc 1]
    if { $th > $h } { set h $th }

    if {$i != $n} {
      set content "$content<td>$tcontent</td><td>$rarr</td>"
    } else {
      set content "$content<td>$tcontent</td>"
    }
  }

  set content "<table><tr>$content</tr></table>"

  return [list $h $content]
}

# Draw a sequence of terms from right to left.
#
proc draw_backwards_line {lx} {
  global c9474 c9488 c9484 c9492 c9496 c9581 c9516 c9584 c9583 c9500 c9508 rarr larr hr

  set n [llength $lx]

  set h 1
  if {$n < 1} {
    set content "<td width=100%>$hr</td>"
  } {
    set content ""
    set i 0
    foreach term $lx {
      incr i

      set rc [draw_diagram $term 1]
      set th [lindex $rc 0]
      set tcontent [lindex $rc 1]
      if { $th > $h } { set h $th }

      if {$i != $n} {
        set content "<td>$larr</td><td>$tcontent</td>$content"
      } else {
        set content "<td>$tcontent</td>$content"
      }
    }
  }
  set content "<table><tr>$content<td width=100%>$hr</td></tr></table>"

  return [list $h $content]
}

# Draw a sequence of terms from top to bottom.
#
proc draw_stack {indent lx} {
  global c9474 c9488 c9484 c9492 c9496 c9581 c9516 c9584 c9583 c9500 c9508 rarr larr hr

  set n [llength $lx]

  set h 0
  set content "<table>"

  set i 0
  foreach term $lx {
    set rc [draw_diagram $term 1]
    set th [lindex $rc 0]
    set tcontent [lindex $rc 1]
    set h [ expr { $h + $th } ]

    set v [ expr { $th - 1 } ]
    set vert [string repeat "<tr><td>$c9474</td><tr>" $v]

    incr i
    if {$i == 1} {
      set down "<table><tr><td>$c9488</td></tr>$vert</table>"
      set up "<table><tr><td>$c9484</td></tr>$vert</table>"
      set content "$content<tr><td>$hr</td><td>$hr</td><td>$tcontent</td><td>$rarr</td><td>$down</td><td>$up</td></tr>"
    } elseif {$i == $n} {
      set content "$content<tr><td>$c9492</td><td>$rarr</td><td>$tcontent</td><td>$hr</td><td>$rarr</td><td>$c9496</td></tr>"
    } else { 
      set down "<table><tr><td>$c9488</td></tr>$vert</table>"
      set up "<table><tr><td>$c9474</td></tr>$vert</table>"
      set content "$content<tr><td>$c9492</td><td>$rarr</td><td>$tcontent</td><td>$rarr</td><td>$down</td><td>$up</td></tr>"
    }
    if {$i != $n} {
      incr h
      set content "$content<tr><td>$c9484</td><td>$larr</td><td width=100%>$hr</td><td>$larr</td><td>$c9496</td><td>$c9474</td></tr>"
    }
  }
  set content "$content</table>"

  return [list $h $content]
}

proc draw_loop {forward back} {
  global c9474 c9488 c9484 c9492 c9496 c9581 c9516 c9584 c9583 c9500 c9508 rarr larr hr

  set h 0
  set content "<table>"

  set rc [draw_diagram $forward 1]
  set th [lindex $rc 0]
  set tcontent [lindex $rc 1]

  set v [ expr { $th - 1 } ]
  set vert [string repeat "<tr><td>$c9474</td><tr>" $v]

  set up "$c9581"
  set down "$c9516"
  if { $v > 0 } {
    set up "<table><tr><td>$c9581</td></tr>$vert</table>"
    set down "<table><tr><td>$c9516</td></tr>$vert</table>"
  }
  
  set h [ expr { $h + $th } ]
  set content "$content<tr><td>$up</td><td>$rarr</td><td>$tcontent</td><td>$rarr</td><td>$down</td></tr>"

  set rc [draw_backwards_line $back]
  set th [lindex $rc 0]
  set tcontent [lindex $rc 1]

  set h [ expr { $h + $th } ]
  set content "$content<tr><td>$c9584</td><td>$larr</td><td>$tcontent</td><td>$larr</td><td>$c9583</td></tr>"

  set content "$content</table>"

  return [list $h $content]
}

proc draw_toploop {forward back} {
  global c9474 c9488 c9484 c9492 c9496 c9581 c9516 c9584 c9583 c9500 c9508 rarr larr hr

  set h 0
  set content "<table>"

  set rc [draw_diagram $forward 1]
  set th [lindex $rc 0]
  set tcontent [lindex $rc 1]

  set v [ expr { $th - 1 } ]
  set vert [string repeat "<tr><td>$c9474</td><tr>" $v]

  set up "$c9581"
  set down "$c9516"
  if { $v > 0 } {
    set up "<table><tr><td>$c9581</td></tr>$vert</table>"
    set down "<table><tr><td>$c9516</td></tr>$vert</table>"
  }
  
  set h [ expr { $h + $th } ]
  set content "$content<tr><td>$up</td><td>$rarr</td><td>$tcontent</td><td>$rarr</td><td>$down</td></tr>"

  set rc [draw_backwards_line $back]
  set th [lindex $rc 0]
  set tcontent [lindex $rc 1]

  set h [ expr { $h + $th } ]
  set content "$content<tr><td>$c9584</td><td>$larr</td><td>$tcontent</td><td>$larr</td><td>$c9583</td></tr>"

  set content "$content</table>"

  return [list $h $content]
}

proc draw_or {lx} {
  global c9474 c9488 c9484 c9492 c9496 c9581 c9516 c9584 c9583 c9500 c9508 rarr larr hr

  set n [llength $lx]

  set h 0
  set content "<table>"

  set i 0
  foreach term $lx {

    set rc [draw_diagram $term 1]
    set th [lindex $rc 0]
    set tcontent [lindex $rc 1]

    set v [ expr { $th - 1 } ]
    set vert [string repeat "<tr><td>$c9474</td><tr>" $v]

    incr i
    if {$i == 1} {
      set beg "<tr><td>$c9516</td><tr>"
      set end "<tr><td>$c9516</td><tr>"
    } elseif {$i == $n} {
      set beg "<tr><td>$c9492</td><tr>"
      set end "<tr><td>$c9496</td><tr>"
      set vert ""
    } else { 
      set beg "<tr><td>$c9500</td><tr>"
      set end "<tr><td>$c9508</td><tr>"
    }
    
    set h [ expr { $h + $th } ]
    set content "$content<tr><td><table>$beg$vert</table></td><td>$rarr</td><td>$tcontent</td><td>$rarr</td><td><table>$end$vert</table></td></tr>"
  }

  set content "$content</table>"

  return [list $h $content]
}

proc draw_diagram {spec {draw_hr 0}} {
  global c9474 c9488 c9484 c9492 c9496 c9581 c9516 c9584 c9583 c9500 c9508 rarr larr hr

  set n [llength $spec]
  set cmd [lindex $spec 0]

  if {$n==1} {
    set rc [draw_bubble $spec]
  } elseif {$n==0} {
    set rc [draw_bubble nil]
  } elseif {$cmd=="line"} {
    set rc [draw_line [lrange $spec 1 end]]
  } elseif {$cmd=="stack"} {
    set rc [draw_stack 0 [lrange $spec 1 end]]
  } elseif {$cmd=="indentstack"} {
    set rc [draw_stack $::HSEP [lrange $spec 1 end]]
  } elseif {$cmd=="loop"} {
    set rc [draw_loop [lindex $spec 1] [lindex $spec 2]]
  } elseif {$cmd=="toploop"} {
    set rc [draw_toploop [lindex $spec 1] [lindex $spec 2]]
  } elseif {$cmd=="or"} {
    set rc [draw_or [lrange $spec 1 end]]
  } elseif {$cmd=="opt"} {
    set args [lrange $spec 1 end]
    if {[llength $args]==1} {
      set rc [draw_or [list nil [lindex $args 0]]]
    } else {
      set rc [draw_or [list nil "line $args"]]
    }
  } elseif {$cmd=="optx"} {
    set args [lrange $spec 1 end]
    if {[llength $args]==1} {
      set rc [draw_or [list [lindex $args 0] nil]]
    } else {
      set rc [draw_or [list "line $args" nil]]
    }
  } elseif {$cmd=="tailbranch"} {
    # set rc [draw_tail_branch [lrange $spec 1 end]]
    set rc [draw_or [lrange $spec 1 end]]
  } else {
    error "unknown operator: $cmd"
  }

  set h [lindex $rc 0]
  set content [lindex $rc 1]

  if {$draw_hr} {
    set content "<table><tr><td>$content</td><td width=100%>$hr</td></tr></table>"
  } {
    set content "<table><tr><td>$content</td></tr></table>"
  }

  return [list $h $content]
}

proc draw_graph {name spec} {
  set rc [ draw_diagram "line bullet [list $spec] bullet"]
  set h [lindex $rc 0]
  set content [lindex $rc 1]
  return [list $h $content]
}

set f [open all-text.html w]
puts $f "<html>"
puts $f "<head>"
puts $f "<style type='text/css'>"
puts $f "h3 { font-family:helvetica; font-size:$font3; }"
puts $f "table, td { border-style:none; margin:0px; padding:0px; border-spacing:0px; }"
puts $f "td { vertical-align:top; white-space:nowrap; font-family:helvetica; font-size:$font3; }"
puts $f "hr { height:1px; }"
puts $f ".round { font-size:$font1; border-style:solid; border-width:1px; margin:0px; padding:1px; border-spacing:0px; border-radius:$rad; -moz-border-radius:$rad; -webkit-border-radius:$rad; }"
puts $f ".square { font-size:$font1; border-style:solid; border-width:1px; margin:0px; padding:1px; border-spacing:0px; }"
puts $f ".side { border-style:solid; border-width:1px; }"
puts $f ".top { empty-cells:show; padding:$rad; border-top-style:solid; border-width:1px; }"
puts $f ".bottom { empty-cells:show; padding:$rad; border-bottom-style:solid; border-width:1px; }"
puts $f ".rside { empty-cells:show; padding:$rad; border-right-style:solid; border-width:1px; }"
puts $f ".lside { empty-cells:show; padding:$rad; border-left-style:solid; border-width:1px; }"
puts $f ".empty { empty-cells:show; padding:$rad; }"
puts $f "</style>"
puts $f "</head>"
puts $f "<body>"
foreach {name graph} $all_graphs {
  puts $f "<h3>$name:</h3>"
  set rc [draw_graph $name $graph]
  set h [lindex $rc 0]
  set content [lindex $rc 1]
  puts $f "$content"
}
puts $f "</body>"
puts $f "</html>"
close $f