This file is indexed.

/usr/share/perl5/Games/Go/Dg2ASCII.pm is in sgf2dg 4.026-10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
# $Id: Dg2ASCII.pm 143 2005-06-03 21:05:57Z reid $

#   Dg2ASCII
#
#   Copyright (C) 2005 Reid Augustin reid@hellosix.com
#                      1000 San Mateo Dr.
#                      Menlo Park, CA 94025 USA
#
#   This library is free software; you can redistribute it and/or modify it
#   under the same terms as Perl itself, either Perl version 5.8.5 or, at your
#   option, any later version of Perl 5 you may have available.
#
#   This program 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.
#

=head1 NAME

Games::Go::Dg2ASCII - Perl extension to convert Games::Go::Diagrams to ASCII diagrams

=head1 SYNOPSIS

use Games::Go::Dg2ASCII

 my $dg2ascii = B<Games::Go::Dg2ASCII-E<gt>new> (options);
 my $ascii = $dg2ascii->convertDiagram($diagram);

=head1 DESCRIPTION

A Games::Go::Dg2ASCII object converts a L<Games::Go::Diagram> object
into ASCII diagrams.

=cut

use strict;
require 5.001;

package Games::Go::Dg2ASCII;
use Carp;

our @ISA = qw(Exporter);

# Items to export into callers namespace by default. Note: do not export
# names by default without a very good reason. Use EXPORT_OK instead.
# Do not simply export all your public functions/methods/constants.

# This allows declaration       use PackageName ':all';
# If you do not need this, moving things directly into @EXPORT or @EXPORT_OK
# will save memory.
our %EXPORT_TAGS = ( 'all' => [ qw(
) ] );

our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );

our @EXPORT = qw(
);

BEGIN {
    our $VERSION = sprintf "1.%03d", '$Revision: 143 $' =~ /(\d+)/;
}

######################################################
#
#       Class Variables
#
#####################################################

use constant TOPLEFT     => ' +--';
use constant TOPRIGHT    => '-+  ';
use constant TOP         => '----';
use constant BOTTOMLEFT  => ' +--';
use constant BOTTOMRIGHT => '-+  ';
use constant BOTTOM      => '----';
use constant LEFT        => ' |  ';
use constant RIGHT       => ' |  ';
use constant MIDDLE      => ' +  ';
use constant HOSHI       => ' *  ';
use constant WHITE       => " O  ";    # numberless white stone
use constant BLACK       => " X  ";    # numberless black stone
use constant MARKEDWHITE => " @  ";    # marked white stone
use constant MARKEDBLACK => " #  ";    # marked black stone

our %options = (
    boardSize       => 19,
    doubleDigits    => 0,
    coords          => 0,
    topLine         => 1,
    bottomLine      => 19,
    leftLine        => 1,
    rightLine       => 19,
    diaCoords       => sub { my ($x, $y) = @_;
                             $x = chr($x - 1 + ord('a'));
                             $y = chr($y - 1 + ord('a'));
                             return("$x$y"); },
    file            => undef,
    filename        => 'unknown',
    print           => sub { return; }, # Hmph...
    );

######################################################
#
#       Public methods
#
#####################################################

=head1 METHODS

=over 4

=item my $dg2ascii = B<Games::Go::Dg2ASCII-E<gt>new> (?options?)

A B<new> Games::Go::Dg2ASCII takes the following options:

=back

=head2 General Dg2 Converter Options:

=over 4

=item B<boardSize> =E<gt> number

Sets the size of the board.

Default: 19

=item B<doubleDigits> =E<gt> true | false

Numbers on stones are wrapped back to 1 after they reach 100.
Numbers associated with comments and diagram titles are not
affected.

Default: false

=item B<coords> =E<gt> true | false

Generates a coordinate grid.

Default: false

=item B<topLine>     =E<gt> number (Default: 1)

=item B<bottomLine>  =E<gt> number (Default: 19)

=item B<leftLine>    =E<gt> number (Default: 1)

=item B<rightLine>   =E<gt> number (Default: 19)

The edges of the board that should be displayed.  Any portion of the
board that extends beyond these numbers is not included in the
output.

=item B<diaCoords> =E<gt> sub { # convert $x, $y to Games::Go::Diagram
coordinates }

This callback defines a subroutine to convert coordinates from $x,
$y to whatever coordinates are used in the Games::Go::Diagram
object.  The default B<diaCoords> converts 1-based $x, $y to the
same coordinates used in SGF format files.  You only need to define
this if you're using a different coordinate system in the Diagram.

Default:
    sub { my ($x, $y) = @_;
          $x = chr($x - 1 + ord('a')); # convert 1 to 'a', etc
          $y = chr($y - 1 + ord('a'));
          return("$x$y"); },           # concatenate two letters

=item B<file> =E<gt> 'filename' | $descriptor | \$string | \@array

If B<file> is defined, the ASCII diagram is dumped into the target.
The target can be any of:

=over 4

=item filename

The filename will be opened using IO::File->new.  The filename
should include the '>' or '>>' operator as described in 'perldoc
IO::File'.  The ASCII diagram is written into the file.

=item descriptor

A file descriptor as returned by IO::File->new, or a \*FILE
descriptor.  The ASCII diagram is written into the file.

=item reference to a string scalar

The ASCII diagram is concatenated to the end of the string.

=item reference to an array

The ASCII diagram is split on "\n" and each line is pushed onto the array.

=back

Default: undef

=item B<print> =E<gt> sub { my ($dg2ascii, @lines) = @_; ... }

A user defined subroutine to replace the default printing method.
This callback is called from the B<print> method (below) with the
reference to the B<Dg2ASCII> object and a list of lines that are
part of the ASCII diagram lines.

=cut

sub new {
    my ($proto, %args) = @_;

    my $my = {};
    bless($my, ref($proto) || $proto);
    $my->{converted} = '';
    foreach (keys(%options)) {
        $my->{$_} = $options{$_};  # transfer default options
    }
    # transfer user args
    $my->configure(%args);
    return($my);
}

=item $dg2tex-E<gt>B<configure> (option =E<gt> value, ?...?)

Change Dg2TeX options from values passed at B<new> time.

=cut

sub configure {
    my ($my, %args) = @_;

    if (exists($args{file})) {
        $my->{file} = delete($args{file});
        if (ref($my->{file}) eq 'SCALAR') {
            $my->{filename} = $my->{file};
            $my->{print} = sub { ${$_[0]->{file}} .= $_[1]; };
        } elsif (ref($my->{file}) eq 'ARRAY') {
            $my->{filename} = 'ARRAY';
            $my->{print} = sub { push @{$_[0]->{file}}, split("\n", $_[1]); };
        } elsif (ref($my->{file}) eq 'GLOB') {
            $my->{filename} = 'GLOB';
            $my->{print} = sub { $_[0]->{file}->print($_[1]) or
                                        die "Error writing to output file:$!\n"; };
        } elsif (ref($my->{file}) =~ m/^IO::/) {
            $my->{filename} = 'IO';
            $my->{print} = sub { $_[0]->{file}->print($_[1]) or
                                        die "Error writing to output file:$!\n"; };
        } else {
            require IO::File;
            $my->{filename} = $my->{file};
            $my->{file} = IO::File->new($my->{filename}) or
                die("Error opening $my->{filename}: $!\n");
            $my->{print} = sub { $_[0]->{file}->print($_[1]) or
                                        die "Error writing to $_[0]->{filename}:$!\n"; };
        }
    }
    foreach (keys(%args)) {
        croak("I don't understand option $_\n") unless(exists($options{$_}));
        $my->{$_} = $args{$_};  # transfer user option
    }
    # make sure edges of the board don't exceed boardSize
    $my->{topLine}    = 1 if ($my->{topLine} < 1);
    $my->{leftLine}   = 1 if ($my->{leftLine} < 1);
    $my->{bottomLine} = $my->{boardSize} if ($my->{bottomLine} > $my->{boardSize});
    $my->{rightLine}  = $my->{boardSize} if ($my->{rightLine} > $my->{boardSize});
}

=item $dg2ascii-E<gt>B<print> ($text ? , ... ?)

B<print>s the input $text directly to B<file> as defined at B<new>
time.  Whether or not B<file> was defined, B<print> accumulates the
$text for later retrieval with B<converted>.

=cut

sub print {
    my ($my, @args) = @_;

    foreach my $arg (@args) {
        $my->{converted} .= $arg;
        &{$my->{print}} ($my, $arg);
    }
}

=item my $ascii = $dg2ascii-E<gt>B<converted> ($replacement)

Returns the entire ASCII diagram converted so far for the
B<Dg2ASCII> object.  If $replacement is defined, the accumulated
ASCII is replaced by $replacement.

=cut

sub converted {
    my ($my, $text) = @_;

    $my->{converted} = $text if (defined($text));
    return ($my->{converted});
}

=item $dg2ascii-E<gt>B<comment> ($comment ? , ... ?)

Inserts the comment character (which is nothing for ASCII) in front
of each line of each comment and B<print>s it to B<file>.

=cut

sub comment {
    my ($my, @comments) = @_;

    foreach my $c (@comments) {
        while ($c =~ s/([^\n]*)\n//) {
            $my->print("$1\n");
        }
        $my->print("$c\n") if ($c ne '');
    }
}

=item my $dg2ascii-E<gt>B<convertDiagram> ($diagram)

Converts a I<Games::Go::Diagram> into ASCII.  If B<file> was defined
in the B<new> method, the ASCII is dumped into the B<file>.  In any
case, the ASCII is returned as a string scalar.

=cut

sub convertDiagram {
    my ($my, $diagram) = @_;

    unless($my->{firstDone}) {
        $my->print("
Black -> X   Marked black -> #   Labeled black -> Xa, Xb
White -> O   Marked white -> @   Labeled white -> Oa, Ob\n");
        $my->{firstDone} = 1;
    }
    $my->convertProperties($diagram->property(0));      # any game-level properties?
    my @name = $diagram->name;
    $name[0] = 'Unknown Diagram' unless(defined($name[0]));
    my $propRef = $diagram->property;                   # get property list for the diagram
    my $first = $diagram->first_number;
    my $last = $diagram->last_number;
    $my->{offset} = $diagram->offset;
    $my->{stoneOffset} = $diagram->offset;
    if ($my->{doubleDigits}) {
        while ($first - $my->{stoneOffset} >= 100) {
            $my->{stoneOffset} += 100;      # first to last is not supposed to cross 101
        }
    }
    my $range = '';
    if ($first) {
        $range = ': ' . ($first - $my->{offset});
        if ($last != $first) {
            $range .= '-' . ($last - $my->{offset});
        }
    } else {
        # carp("Hmmm! No numbered moves in $name[0]");
    }

    if (exists($propRef->{0}{N})) {
        $range .= "\n\n$propRef->{0}{N}";       # node name
    }
    # get some measurements based on font size
    my ($diaHeight, $diaWidth) = (($my->{bottomLine} - $my->{topLine} + 1), ($my->{rightLine} - $my->{leftLine} + 1));
    if ($my->{coords}) {
        $diaWidth += 4;
        $diaHeight += 2;
    }
    $my->_preamble($diaHeight, $diaWidth);
    if (defined($diagram->var_on_move) and
        defined($diagram->parent)) {
        my $varOnMove = $diagram->var_on_move;
        my $parentOffset = $diagram->parent->offset;
        my $parentName = $diagram->parent->name->[0];
        if (defined($parentOffset) and
            defined($parentName)) {
            $name[0] .= ' at move ' .
                        ($varOnMove - $parentOffset) .
                        ' in ' .
                        $parentName;
        }
    }

    # print the diagram title
    $my->print(join('', @name, $range, "\n"));
    foreach my $y ($my->{topLine} .. $my->{bottomLine}) {
        foreach my $x ($my->{leftLine} ..  $my->{rightLine}) {
            $my->_convertIntersection($diagram, $x, $y);
        }
        if ($my->{coords}) {    # right-side coords
            $my->print($my->{boardSize} - $y + 1);
        }
        $my->print("\n");
        if ($y < $my->{bottomLine}) {
            if ($my->{rightLine} - $my->{leftLine} > 1) {
                $my->print(LEFT,
                           '    ' x ($my->{rightLine} - $my->{leftLine} - 1),
                           RIGHT,
                           "\n");
            } else {
                $my->print(LEFT, "\n");       # doesn't seem very likely!
            }
        }
    }
    # print coordinates
    $my->_interlude($diaWidth, $diaHeight);

    # deal with the over-lay stones
    $my->_convertOverstones($diagram);
    $my->print("\n");
    # print the game comments for this diagram
    foreach my $n (sort { $a <=> $b } keys(%{$propRef})) {
        my @comment;
        if ((exists($propRef->{$n}{B}) and
             ($propRef->{$n}{B}[0] eq 'tt')) or
            (exists($propRef->{$n}{W}) and
             ($propRef->{$n}{W}[0] eq 'tt'))) {
            push(@comment, "Pass\n\n");
        }
        if (exists($propRef->{$n}{C})) {
            push(@comment, @{$propRef->{$n}{C}});
        }
        if (@comment) {
            my $c = '';
            my $n_off = $n - $my->{offset};
            $c = "$n_off: " if (($n > 0) and
                                ($n >= $first) and
                                ($n <= $last));
            $c .= join("\n", @comment);
            $my->print($my->convertText("$c\n"));
        }
    }
    $my->_postamble();
}

=item my $ascii = $dg2ascii-E<gt>B<convertText> ($text)

Converts $text into ASCII code - gee, that's not very hard.  In
fact, this method simply returns whatever is passed to it.  This is
really just a place-holder for more complicated converters.

Returns the converted text.

=cut

sub convertText {
    my ($my, $text) = @_;

    return $text;
}

=item $title = $dg2ascii-E<gt>B<convertProperties> (\%sgfHash)

B<convertProperties> takes a reference to a hash of properties as
extracted from an SGF file.  Each hash key is a property ID and the
hash value is a reference to an array of property values:
$hash->{propertyId}->[values].  The following SGF properties are
recognized:

=over 4

=item GN GameName

=item EV EVent

=item RO ROund

=item PW PlayerWhite

=item WR WhiteRank

=item PB PlayerBlack

=item BR BlackRank

=item DT DaTe

=item PC PlaCe

=item GC GameComment

=item KM KoMi

=item RE REsult

=item TM TiMe

=back

Both long and short property names are recognized, and all
unrecognized properties are ignored with no warnings.  Note that
these properties are all intended as game-level notations.

=cut

sub convertProperties {
    my ($my, $hashRef) = @_;

    return unless(defined($hashRef));
    my %hash;
    foreach my $key (keys(%{$hashRef})) {
        my $short = $key;
        $short =~ s/[^A-Z]//g;                  # delete everything but upper case letters
        $hash{$short} = join('', @{$hashRef->{$key}});
    }

    my @lines;
    push(@lines, $hash{GN}) if(exists($hash{GN}));      # GameName
    if (defined($hash{EV})) {
        if (defined($hash{RO})) {
            push(@lines, "$hash{EV} - Round $hash{RO}");# EVent name and ROund number
        } else {
            push(@lines, $hash{EV});                    # EVent
        }
    }
    if (defined($hash{PW})) {
        if(defined($hash{WR})) {
            push(@lines, "White: $hash{PW} $hash{WR}");  # PlayerWhite and WhiteRank
        } else {
            push(@lines, "White: $hash{PW}");            # PlayerWhite
        }
    }
    if (defined($hash{PB})) {
        if(defined($hash{BR})) {
            push(@lines, "Black: $hash{PB} $hash{BR}");  # PlayerBlack and BlackRank
        } else {
            push(@lines, "Black: $hash{PB}");            # PlayerBlack
        }
    }
    push(@lines, $hash{DT}) if (defined($hash{DT}));            # DaTe
    push(@lines, $hash{PC}) if (defined($hash{PC}));            # PlaCe
    push(@lines, $hash{GC}) if (defined($hash{GC}));            # GameComment
    if (defined($hash{KM})) {                                   # komi
        if ($hash{KM} =~ m/(\d+\.\d+?)0*$/) {
            # remove ugly trailing zeros supplied by IGS
            $hash{KM} = $1;
        }
        push(@lines, "Komi: $hash{KM}");
    }
    push(@lines, "Result: $hash{RE}") if (defined($hash{RE}));   # result
    push(@lines, "Time: $hash{TM}") if (defined($hash{TM}));     # time constraints
    my ($title)='';
    foreach my $line (@lines) {
        next unless (defined($line));
        $line =~ s/\\([][)(\\])/$1/g;                           # change escaped chars to non-escaped
        $title .= "$line\n";
    }
    if($title ne '') {
        $my->print("\n$title\n");
    }
}

=item $dg2ascii-E<gt>B<close>

B<print>s any final text to the diagram (currently none) and closes
the dg2ascii object.  Also closes B<file> if appropriate.

=cut

sub close {
    my ($my) = @_;

    if (defined($my->{file}) and
        ((ref($my->{file}) eq 'GLOB') or
         (ref($my->{file}) eq 'IO::File'))) {
        $my->{file}->close;
    }
}

######################################################
#
#       Private methods
#
#####################################################

sub _convertOverstones {
    my ($my, $diagram) = @_;

    my @converted;

    foreach my $int (@{$diagram->getoverlist()}) {
        my $overStones = '';
        for(my $ii = 0; $ii < @{$int->{overstones}}; $ii += 2) {
            # all the overstones that were put on this understone:
            my $overColor = $int->{overstones}[$ii];
            my $overNumber = $int->{overstones}[$ii+1];
            $overStones .= ", " if ($overStones ne '');
            local $my->{stoneOffset} = $my->{offset};
            $overStones .= $my->_checkStoneNumber($overNumber);
        }
        my $atStone = '';
        if (exists($int->{number})) {
            # numbered stone in text
            $atStone = $my->_checkStoneNumber($int->{number});
        } else {
            unless (exists($int->{mark})) {
                my $mv = '';
                $mv .= " black node=$int->{black}" if (exists($int->{black}));
                $mv .= " white node=$int->{white}" if (exists($int->{black}));
                carp("Oops: understone$mv is not numbered or marked? " .
                     "This isn't supposed to be possible!");
            }
            if (exists($int->{black})) {
                $atStone = '#';        # marked black stone in text
            }elsif (exists($int->{white})) {
                $atStone = '@';        # marked white stone in text
            } else {
                carp("Oops: understone is not black or white? " .
                     "This isn't supposed to be possible!");
            }
        }
        # collect all the overstones in the diagram
        push(@converted, "$overStones at $atStone");
    }
    return '' unless(@converted);
    $my->print(join(",\n", @converted), "\n");
}

sub _checkStoneNumber {
    my ($my, $number) = @_;

    if ($number - $my->{stoneOffset} > 0) {
        return $number - $my->{stoneOffset};
    }
    if ($number < 1) {
        carp "Yikes: stone number $number is less than 1.  Intersection/stone will be missing!";
    } else {
        carp "Stone number $number and offset $my->{stoneOffset} makes less than 1 - not using offset";
    }
    return $number;
}


sub _formatNumber {
    my ($my, $number) = @_;

    return " $number  " if ($number < 10);
    return  "$number  " if ($number < 100);
    return   "$number ";
}

# get text for intersection hash from $diagram.
sub _convertIntersection {
    my ($my, $diagram, $x, $y) = @_;

    my $int = $diagram->get(&{$my->{diaCoords}}($x, $y));
    my $stone;
    if (exists($int->{number})) {
        $stone = $my->_formatNumber($my->_checkStoneNumber($int->{number})); # numbered stone
    } elsif (exists($int->{mark})) {
        if (exists($int->{black})) {
            $stone = MARKEDBLACK;                       # marked black stone
        }elsif (exists($int->{white})) {
            $stone = MARKEDWHITE;                       # marked white stone
        } else {
            carp("Can't mark empty intersction");
        }
    } elsif (exists($int->{label})) {
        if (exists($int->{black})) {
            $stone = ' ' . BLACK . lc($int->{label}) . ' ';     # labeled black stone
        } elsif (exists($int->{white})) {
            $stone = ' ' . WHITE . lc($int->{label}) . ' ';     # labeled white stone
        } else {
            $stone = " $int->{label}  ";                        # labeled intersection
        }
    } elsif (exists($int->{white})) {
        $stone = WHITE;       # numberless white stone
    } elsif (exists($int->{black})) {
        $stone = BLACK;        # numberless black stone
    }

    unless (defined($stone)) {
        if (exists($int->{hoshi})) {
            $stone = HOSHI;
        } else {
            $stone = $my->_underneath($x, $y);
        }
    }
    $my->print($stone);
}

# return the appropriate font char for the intersection
sub _underneath {
    my ($my, $x, $y) = @_;

    if ($y <= 1) {
        return TOPLEFT if ($x <= 1);            # upper left corner
        return TOPRIGHT if ($x >= $my->{boardSize}); # upper right corner
        return TOP;                             # upper side
    } elsif ($y >= $my->{boardSize}) {
        return BOTTOMLEFT if ($x <= 1);         # lower left corner
        return BOTTOMRIGHT if ($x >= $my->{boardSize}); # lower right corner
        return BOTTOM;                          # lower side
    }
    return LEFT if ($x <= 1);                   # left side
    return RIGHT if ($x >= $my->{boardSize});   # right side
    return MIDDLE;                              # somewhere in the middle
}

# don't need any preamble for text diagrams
sub _preamble {
    my ($my, $diaHeight, $diaWidth) = @_;

    return;
}

sub _interlude {
    my ($my, $diaWidth, $diaHeight) = @_;

    # print coordinates along the bottom
    if ($my->{coords}) {
        my ($l, $r) = ($my->{leftLine}, $my->{rightLine});
        $my->print(' ',
        join('   ', (qw(A B C D E F G H J K L M N O P Q R S T U V W X Y Z))[($l - 1) .. ($r - 1)]), "\n");
    }
}

# this one's pretty easy too
sub _postamble {
    my ($my) = @_;

    $my->print("\n\n");
}

1;

__END__

=back

=head1 SEE ALSO

=over 4

=item L<sgf2dg>(1)

Script to convert SGF format files to Go diagrams

=back

=head1 BUGS

Seems unlikely.

=head1 AUTHOR

Reid Augustin, E<lt>reid@hellosix.comE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright (C) 2005 by Reid Augustin

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.5 or,
at your option, any later version of Perl 5 you may have available.

=cut