-
Notifications
You must be signed in to change notification settings - Fork 138
/
sudoku.pir
2440 lines (2179 loc) · 50 KB
/
sudoku.pir
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
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
# Copyright (C) 2005-2012, Parrot Foundation.
=pod
=head1 TITLE
Sudoku - A sudoku solver
=head1 OVERVIEW
This program implements scanning and blocked rows or columns invalidation.
It does not consider all effects of multiple number blocking, where a
combination of invalid numbers blocks a row or column. In such cases a
simple backtracking algorithm continues to solve the sudoku.
=head1 SYNOPSIS
parrot sudoku.pir [--options] [file]
If no file is given a builtin game is run.
Valid options are:
=over 4
=item --version
Print version information and exit.
=item --help
Print help hint and exit.
=item --debug
Print debug output and game progress to stdout.
=item --inv=n..
Print additionally invalid state of given number(s).
=item --pairs
Print additionally fields with uniqe pairs of numbers.
=item --builtin=name
Run builtin game. If no name is given a list of builtins is printed.
=item --nc
Use ncurses for display and single step through progress. Press any key
for next display.
=back
=head1 DESCRIPTION
The game state is held in multiple views which share one Integer PMC
per common position. Thus updating a row sets also the column or square
information. These three views are list of lists.
=head1 GAME FILES
Game files may contain comments (hash sign in the first column)
digits, and dots for empty fields. E.g:
# std020.sud
# der standard 020 - leicht
2.1..678.
...2...36
8.9.3...5
.7...4..2
..6.9.5..
9..5...6.
5...4.9.7
71...3...
.987..2.3
=head1 PARROT
=head2 Parrot features used
=over 4
=item Parrot OO
The solver is an object as well as the display.
=item Freeze/thaw
For deep copying the game state for backtracking.
=item Multi Method Dispatch
The display classes define multiple methods with the name I<print>,
which take different types and amounts of arguments.
=item Libraries
The program uses Getopt/Obj and the ncurses library.
=item Exception handling
To turn off ncurses just in case.
=back
=head2 Variable indices
Column, rows, and sqares have zero-based indices. Squares are
numbered from top left to bottom right.
=head2 Sudoku Class attributes
=over 4
=item I<rows, cols, sqrs>
LoL of 0 = free, 1..9 = number
=item I<i_rows, i_cols, i_sqrs>
LoL of a bitmask of invalid numbers per field. Bits are starting at bit
one not zero.
=item I<all>
Hash referencing these 6 items - used for backtracking.
=item I<opt>
The option hash.
=item I<disp>
Holds an instance of the display class (I<Dummy>, I<NCurses>) to use.
=back
=head1 AUTHOR
Leopold Toetsch
=head1 COPYRIGHT
Same as parrot.
=cut
.const string VERSION="0.2.3"
.loadlib 'bit_ops'
.loadlib 'io_ops'
.sub _main :main
.param pmc argv
.local int argc
.local string raw_given
.local pmc opt
opt = parse_options(argv)
argc = elements argv
dec argc
if argc < 0 goto get_default
$I0 = defined opt["builtin"]
if $I0 goto get_default
$S0 = argv[argc]
raw_given = read_given($S0)
goto done_input
get_default:
raw_given = builtin_game(opt)
done_input:
run_game(raw_given, opt)
.end
# create game class, object, display, and run
.sub run_game
.param string raw_given
.param pmc opt
.local pmc ar
ar = verify_input(raw_given)
.local pmc cl, self, disp
cl = newclass "Sudoku"
addattribute cl, "orig"
addattribute cl, "all"
addattribute cl, "cols"
addattribute cl, "rows"
addattribute cl, "sqrs"
addattribute cl, "i_cols"
addattribute cl, "i_rows"
addattribute cl, "i_sqrs"
addattribute cl, "opt"
addattribute cl, "disp"
self = new "Sudoku"
setattribute self, "opt", opt
disp = self."new_display"()
##push_eh nc_stop
self."create"(ar)
self."display"()
$I0 = self."verify"()
unless $I0 goto err
if $I0 == 1 goto ok
if $I0 == 2 goto fin
ok:
disp."print"("init ok\n")
$I0 = self."solve"()
if $I0 == 1 goto nok
if $I0 == 0 goto nc_stop
fin:
self."display"()
disp."print"("solved\n")
disp."wait"()
nc_stop:
self."end_display"()
end
nok:
# need backtracking
.local pmc tries, all
tries = new 'ResizablePMCArray'
all = getattribute self, "all"
push tries, all
$I0 = self."back_track"(tries)
if $I0 == 2 goto fin
disp."print"("failed\n")
goto nc_stop
err:
printerr "inconsistent start\n"
self."end_display"()
die 3, 100
.end
# read game from file
# - ignore comment lines w/ hash sign in first col
# - valid chars are dots (empty) and digits 1..9
.sub read_given
.param string file_name
.local pmc io
.local string line, result, c
.local int i, len
result = ""
io = open file_name, 'r'
$I0 = defined io
unless $I0 goto err
loop:
line = readline io
unless io goto done
substr c, line, 0, 1
if c == '#' goto loop
len = length line
i = 0
lp2:
substr c, line, i, 1
if c != '.' goto no_dot
result .= c
no_dot:
if c < '1' goto no_num
if c > '9' goto no_num
result .= c
no_num:
inc i
if i < len goto lp2
goto loop
done:
.return(result)
err:
printerr "read '"
printerr file_name
printerr "' failed\n"
die 3, 100
.end
# get commandline options
.sub parse_options
.param pmc argv
load_bytecode "Getopt/Obj.pbc"
.local string prog
prog = shift argv
# Specification of command line arguments.
# --version, --debug, --inv=nnn, --builtin=name, --nc, --help
.local pmc getopts
getopts = new ["Getopt";"Obj"]
push getopts, "version"
push getopts, "debug"
push getopts, "pairs"
push getopts, "inv=s"
push getopts, "builtin:s" # optional
push getopts, "nc"
push getopts, "help"
.local pmc opt
opt = getopts."get_options"(argv)
$I0 = defined opt['version']
unless $I0 goto n_ver
print prog
print " "
print VERSION
print "\n"
end
n_ver:
$I0 = defined opt['help']
unless $I0 goto n_help
print "usage: "
print prog
print " [options...] [file]\n"
print "see\n\tperldoc -F "
print prog
print "\nfor more\n"
end
n_help:
$I0 = defined opt['debug']
unless $I0 goto n_deb
print "debugging on\n"
n_deb:
.return (opt)
.end
.include "iterator.pasm"
# return one of the builtin games
.sub builtin_game
.param pmc opt
.local string raw_given, name
.local pmc b, it
b = get_builtins()
$I0 = exists opt["builtin"]
if $I0 goto some
$S0 = b['wikipedia']
.return ($S0)
some:
name = opt["builtin"]
if name == "1" goto list_names
if name goto sel_name
list_names:
it = iter b
it = .ITERATE_FROM_START
loop:
unless it goto fin
$S0 = shift it
print $S0
print " "
goto loop
fin:
say ''
end
sel_name:
$I0 = exists b[name]
if $I0 goto ok
printerr "no such builtin: '"
printerr name
printerr "'\n"
die 3, 100
ok:
$S0 = b[name]
.return ($S0)
.end
.sub get_builtins
.local pmc b
.local string raw_given
b = new 'Hash'
# sudokusan malicious 26.6
raw_given = "..9...8.."
raw_given .= "....85..."
raw_given .= "4..23...1"
raw_given .= ".4....9.."
raw_given .= ".75...34."
raw_given .= "..2....8."
raw_given .= "1...59..4"
raw_given .= "...17...."
raw_given .= "..3...6.."
b["san_m0626"] = raw_given
# sudokusan atrocious 20.6
raw_given = "..2.1..5."
raw_given .= "95...736."
raw_given .= ".3......8"
raw_given .= ".8.6.1..."
raw_given .= "5...2...3"
raw_given .= "...7.5.1."
raw_given .= "8......3."
raw_given .= ".451...29"
raw_given .= ".1..6.4.."
b["san_a0620"] = raw_given
# sudokusan atrocious 24.6
raw_given = ".83......"
raw_given .= "....4...3"
raw_given .= "..79..8.6"
raw_given .= "....2.3.."
raw_given .= ".6.8.3.1."
raw_given .= "..5.6...."
raw_given .= "4.6..97.."
raw_given .= "3...8...."
raw_given .= "......12."
b["san_a0624"] = raw_given
# sudokusan atrocious 26.6
raw_given = "5.93....7"
raw_given .= "....9...."
raw_given .= "....64..1"
raw_given .= "..6.....5"
raw_given .= ".58...27."
raw_given .= "2.....4.."
raw_given .= "7..51...."
raw_given .= "....4...."
raw_given .= "8....61.9"
b["san_a0626"] = raw_given
# sudoku-san 4th aug 2006 - atrocious - Y-WING
raw_given = ".....1..."
raw_given .= "6..7....5"
raw_given .= ".82..49.."
raw_given .= ".734...8."
raw_given .= "........."
raw_given .= ".5...736."
raw_given .= "..16..23."
raw_given .= "9....5..1"
raw_given .= "...8....."
b["san_a0804"] = raw_given
# wikipedia - (one of ) the smallest (17 clues) known sudoku
raw_given = "1........"
raw_given .= "..274...."
raw_given .= "...5....4"
raw_given .= ".3......."
raw_given .= "75......."
raw_given .= ".....96.."
raw_given .= ".4...6..."
raw_given .= ".......71"
raw_given .= ".....1.3."
b["wikipedia"] = raw_given
# derstandard 019 schwer
raw_given = "....8..5."
raw_given .= ".123....6"
raw_given .= ".456....."
raw_given .= ".789....."
raw_given .= "5.......4"
raw_given .= ".....123."
raw_given .= ".....456."
raw_given .= "3....789."
raw_given .= ".5..3...."
b["std019"] = raw_given
# derstandard 018 mittel
raw_given = "....247.."
raw_given .= ".1.....5."
raw_given .= "..8.....3"
raw_given .= "..25....7"
raw_given .= ".4..3..8."
raw_given .= "6....91.."
raw_given .= "7.....9.."
raw_given .= ".3.....6."
raw_given .= "..581...."
b["std018"] = raw_given
# "unsolvable" 3 - Y-Wing
raw_given = "...8....6"
raw_given .= "..162.43."
raw_given .= "4...71..2"
raw_given .= "..72...8."
raw_given .= "....1...."
raw_given .= ".1...62.."
raw_given .= "1..73...4"
raw_given .= ".26.481.."
raw_given .= "3....5..."
b["uns3"] = raw_given
.return (b)
.end
# count zero bits
.sub bits0
.param int c
.local int i, n, b
i = 0
n = 0
loop:
c >>= 1 # bits start at 1
b = c & 1
if b goto is_set
inc n
is_set:
inc i
if i < 9 goto loop
.return (n)
.end
# count one bits (3 max - zero based)
.sub bits1
.param int c
.local int i, n, b
i = 0
n = 0
loop:
b = c & 1
c >>= 1
unless b goto not_set
inc n
not_set:
inc i
if i < 3 goto loop
.return (n)
.end
# make sure the game is valid
.sub verify_input
.param string raw
.local int i, c
i = length raw
if i != 81 goto len_err
.local pmc ar
ar = new 'FixedIntegerArray'
ar = 81
i = 0
loop:
$I0 = ord raw, i
if $I0 != 0x2e goto not_dot
c = 0
goto set_it
not_dot:
if $I0 < 0x30 goto err
if $I0 > 0x39 goto err
c = $I0 - 0x30
set_it:
ar[i] = c
inc i
if i < 81 goto loop
.return (ar)
err:
printerr "ill char: '"
substr $S0, raw, i, 1
printerr $S0
printerr "\n"
die 3, 100
len_err:
printerr "length != 81 found : "
printerr i
printerr "\n"
die 3, 100
.end
#
# game methods
#
.namespace ["Sudoku"]
# return true if we single-step
.sub "step" :method
.local pmc opt
opt = getattribute self, "opt"
$I0 = defined opt['debug']
unless $I0 goto check_nc
.return ($I0)
check_nc:
$I0 = defined opt['nc']
.return ($I0)
.end
# return true if debugging is on
.sub "debug" :method
.local pmc opt
opt = getattribute self, "opt"
$I0 = defined opt['debug']
.return ($I0)
.end
# create 9x9 LoL
.sub create_1 :method
.param string what
.local pmc rcss, rcs, all
rcss = new 'FixedPMCArray'
rcss = 9
setattribute self, what, rcss
all = getattribute self, "all"
all[what] = rcss
.local int y
# create arrays
y = 0
ly1:
rcs = new 'FixedPMCArray'
rcs = 9
rcss[y] = rcs
inc y
if y < 9 goto ly1
.end
# create all arrays
.sub create :method
.param pmc ar
.local int x, y, p, c
.local pmc cols, rows, sqrs, e, col, row, sqr, all
.local pmc i_cols, i_rows, i_sqrs, i_col, i_row, i_sqr, inv
setattribute self, "orig", ar
all = new 'Hash'
setattribute self, "all", all
self.'create_1'("rows")
self.'create_1'("cols")
self.'create_1'("sqrs")
self.'create_1'("i_rows")
self.'create_1'("i_cols")
self.'create_1'("i_sqrs")
rows = getattribute self, "rows"
cols = getattribute self, "cols"
sqrs = getattribute self, "sqrs"
i_rows = getattribute self, "i_rows"
i_cols = getattribute self, "i_cols"
i_sqrs = getattribute self, "i_sqrs"
# now fill em
y = 0
ly2:
x = 0
lx2:
p = y * 9
p += x
c = ar[p]
# the entries 'e' and 'inv' are common to all 3 views of the sudoku
e = new 'Integer'
e = c
inv = new 'Integer'
# set row
row = rows[y]
i_row = i_rows[y]
row[x] = e
i_row[x] = inv
# set col
col = cols[x]
i_col = i_cols[x]
col[y] = e
i_col[y] = inv
# set square
$I2 = square_of(x, y)
sqr = sqrs[$I2]
i_sqr = i_sqrs[$I2]
$I0 = x % 3
$I1 = y % 3
$I1 *= 3
$I2 = $I0 + $I1
sqr[$I2] = e
i_sqr[$I2] = inv
inc x
if x < 9 goto lx2
inc y
if y < 9 goto ly2
.end
# display
# TODO disp 2nd in different color, use curses or shell escapes
.sub display :method
.local pmc ar, rows, row, opt, disp
.local string s, c
.local int i, x, y, c1, c2, r, deb_pairs
.local string deb_n
deb_n = "" # print inv for that
self."create_inv"()
opt = getattribute self, "opt"
disp = getattribute self, "disp"
$I0 = defined opt["inv"]
unless $I0 goto no_deb
deb_n = opt["inv"]
no_deb:
deb_pairs = defined opt["pairs"]
i = 0
y = 0
s = ""
r = 0
# orig is a linear array 0..80
ar = getattribute self, "orig"
rows = getattribute self, "rows"
loop_y:
$I0 = y % 3
if $I0 goto no_line
disp."print"(r,0,"+---------+---------+---------+\n")
inc r
no_line:
row = rows[y]
x = 0
loop_x:
c1 = ar[i]
c2 = row[x]
if c1 == 0 goto ok
if c2 == 0 goto ok
if c1 != c2 goto intern_err
ok:
c = "."
if c1 == 0 goto nxt
$I0 = c1 + 0x30
c = chr $I0
goto set
nxt:
if c2 == 0 goto set
$I0 = c2 + 0x30
c = chr $I0
set:
$I0 = i % 3
if $I0 goto sp1
s .= '| '
goto sp2
sp1:
s .= ' '
sp2:
s .= c
s .= ' '
inc i
inc x
if x < 9 goto loop_x
s .= '|'
disp."print"(r,0, s)
unless deb_n goto not_deb_n
self."deb_inv"(y, deb_n)
not_deb_n:
unless deb_pairs goto not_deb_pairs
self."deb_pairs"(y)
not_deb_pairs:
disp."print"("\n")
inc r
s = ""
inc y
if y < 9 goto loop_y
disp."print"(r,0,"+---------+---------+---------+\n")
inc r
disp."wait"()
.return()
intern_err:
printerr "diff between ar and try\n"
die 3, 100
.end
# print invalid for given row and number(s)
.sub deb_inv :method
.param int y
.param string ns
.local pmc invs, inv
.local int b, x, c, i, len, n
i = 0
len = length ns
lp_inv:
substr $S0, ns, i, 1
n = $S0
print " "
invs = getattribute self, "i_rows"
inv = invs[y]
x = 0
loop:
$I0 = x % 3
if $I0 goto nosp
print " "
nosp:
c = inv[x]
b = 1 << n
$I0 = c & b
if $I0 goto is_set
print "."
goto nxt
is_set:
print n
nxt:
inc x
if x < 9 goto loop
inc i
if i < len goto lp_inv
.end
# print pairs for given row
.sub deb_pairs :method
.param int y
.local pmc invs, inv
.local int x
print " "
invs = getattribute self, "i_rows"
inv = invs[y]
x = 0
loop:
$I0 = x % 3
if $I0 goto nosp
print " "
nosp:
.local int el, bits, i, b
el = inv[x]
bits = bits0(el)
if bits == 2 goto isa_pair
print ".."
goto nxt_x
isa_pair:
i = 1
bit_loop:
el >>= 1 # bits start at 1
b = el & 1
if b goto is_set
$I0 = i + 0x30
$S0 = chr $I0
print $S0
is_set:
inc i
if i <= 9 goto bit_loop
nxt_x:
inc x
print " "
if x < 9 goto loop
.end
# verify numbers
# returns:
# 0 ... failure
# 1 ... ok
# 2 ... finished
.sub verify :method
.local pmc rcss
.local int r, done
done = 2
rcss = getattribute self, "rows"
r = self."verify_1"(rcss)
unless r goto err
if r == 2 goto fin1
done = 1
fin1:
rcss = getattribute self, "cols"
r = self."verify_1"(rcss)
unless r goto err
if r == 2 goto fin2
done = 1
fin2:
rcss = getattribute self, "sqrs"
r = self."verify_1"(rcss)
unless r goto err
if r == 2 goto fin3
done = 1
fin3:
.return (done)
err:
.return (0)
.end
# verify rows, cols, or sqrs
.sub verify_1 :method
.param pmc rcss
.local int x, y, result
.local pmc one, e, seen, s
result = 2 # finished
y = 0
lpy:
one = rcss[y]
seen = new 'Hash'
x = 0
lpx:
e = one[x]
unless e goto nxtx
$I0 = exists seen[e]
unless $I0 goto not_seen
s = seen[e]
inc s
goto nxtx
not_seen:
seen[e] = 1
nxtx:
inc x
if x < 9 goto lpx
$I0 = elements seen
if $I0 == 9 goto done
result = 1
done:
$I0 = check_seen(seen)
unless $I0 goto ret_0
inc y
if y < 9 goto lpy
.return (result)
ret_0:
.return (0)
.end
# count seen in one
.sub check_seen
.param pmc seen
.local pmc it
it = iter seen
it = .ITERATE_FROM_START
loop:
unless it goto ok
$S0 = shift it
$I0 = seen[$S0]
if $I0 > 1 goto err
goto loop
ok:
.return(1)
err:
.return(0)
.end
# create invalid bits
.sub create_inv :method
.local pmc rcss, i_rcss
rcss = getattribute self, "rows"
i_rcss = getattribute self, "i_rows"
self."create_inv_1"(rcss, i_rcss, "row")
rcss = getattribute self, "cols"
i_rcss = getattribute self, "i_cols"
self."create_inv_1"(rcss, i_rcss, "col")
rcss = getattribute self, "sqrs"
i_rcss = getattribute self, "i_sqrs"
self."create_inv_1"(rcss, i_rcss, "sqr")
.end
# create row, cols, or sqrs of invalid numbers
# one bit per invalid
.sub create_inv_1 :method
.param pmc ars
.param pmc invs
.param string what
.local int x, y, n, i, c
.local pmc ar, inv
y = 0
lpy:
ar = ars[y]
inv = invs[y]
x = 0
lpx:
c = ar[x]
unless c goto nxt_x
$P0 = inv[x]
$P0 |= 0b1111111110
nxt_x:
inc x
if x < 9 goto lpx
n = 1
lpn:
$I0 = self."contains"(ar, n)
unless $I0 goto nxt_n
i = 0
fill:
$I0 = 1 << n
$P1 = inv[i]
$P1 |= $I0
inc i
if i < 9 goto fill
nxt_n:
inc n
if n <= 9 goto lpn
self."create_inv_n"(ar, inv, y, what)
inc y
if y < 9 goto lpy
.end
# if inv contains 2 identical entries and exactly 2 nums are
# allowed these 2 positions are invalid for all other digits
.sub create_inv_n :method
.param pmc ar
.param pmc inv
.param int y
.param string what
.local int x, x1, x2, n, m, msk
.local pmc d, e1, e2, empty_2, digs
# transpose into a digit-base array with positions as bits
# this should simplify the test for 2 empty squares with
# same digit
digs = new 'FixedPMCArray'
digs = 9
n = 0
lpn:
msk = 2 << n
d = new 'Integer'
digs[n] = d
x = 0
# don't bother looking further if n is already set
$I1 = n + 1