9 binmode STDIN, 'encoding(UTF-8)';
10 binmode STDOUT, 'encoding(UTF-8)';
11 binmode STDERR, 'encoding(UTF-8)';
20 my $choname = shift @_;
21 my $cho = $choices{$choname} = { @_, Index => (scalar @choices) };
22 push @choices, $choname;
30 if (m/^([A-Z]+)\s*\=\s*(\S.*)$/) {
31 my ($choname, $desc) = ($1,$2);
32 my $cho = addchoice($choname, Desc => $desc);
33 if ($desc =~ m/\[(\d+):(\d+)\]/) {
34 $cho->{Smaj} = [$1,$2];
35 } elsif ($desc =~ m/\[default\]/) {
38 } elsif (m/^V:\s+(\S+)\s+(\S.*)/) {
39 push @invotes, [ $1, $2 ];
40 } elsif (m/^quorum = ([0-9.]+)$/) {
47 $defcho ||= $choices{FD};
49 $defcho = addchoice('FD', Desc => "Further Discussion");
51 my $defi = $defcho->{Index};
52 die "FD has smaj?!" if $defcho->{Smaj};
55 # $vab[$ia][$ib] = V(A,B)
56 # Actually, it's a list of voters who prefer A to B (A.6(3)(1))
58 # Go through the voters and construct V(A,B)
60 foreach my $iv (@invotes) {
61 my ($votestr,$voter) = @$iv;
63 length $votestr eq @choices or die "wrong vote vector length";
64 my @vs = split //, $votestr;
65 foreach my $ix (0..$#vs) {
69 } elsif ($vchr =~ m/[0-9a-z]/) {
70 $vs[$ix] = ord($vchr);
75 foreach my $ia (0..$#vs) {
76 foreach my $ib ($ia+1..$#vs) {
79 if ($va < $vb) { push @{ $vab[$ia][$ib] }, $voter }
80 elsif ($vb < $va) { push @{ $vab[$ib][$ia] }, $voter }
84 die "voter $voter $@" if $@;
87 our @ch = map { $choices{$_} } @choices;
89 # Print the counts V(A,B)
90 foreach my $iy (-2..$#ch) {
91 foreach my $ix (-2..$#ch) {
100 } elsif ($ix==-2 && $iy==-2) {
103 printf "%5s ", $choices[$ix];
105 printf "%5s ", $choices[$iy];
107 my $v = \( $vab[$iy][$ix] );
110 printf "%5d ", (scalar @$$v);
121 print "dropping $choices[$i]: $why\n";
122 $ch[$i]{Dropped} = $why;
125 print "# quorum A.6(2)\n";
127 foreach my $i (0..$#choices) {
128 next if $ch[$i]{Dropped};
130 my $v = $vab[$i][$defi];
131 next if $v >= $quorum;
132 drop $i, "quorum ($v < $quorum)";
135 print "# maj. ratio A.6(3)\n";
137 foreach my $i (0..$#choices) {
138 next if $ch[$i]{Dropped};
140 my $majr = $ch[$i]{Smaj};
141 $majr ||= [1,1]; # A.6(3)(3)
142 my $vad = scalar @{ $vab[$i][$defi] };
143 my $vda = scalar @{ $vab[$defi][$i] };
144 next if $vad * $majr->[1] > $vda * $majr->[0];
145 drop $i, "majority ratio ($vad * $majr->[1] <= $vda * $majr->[0])";
148 my $defeats = Graph::Directed->new; # A.6(4)
150 foreach my $ia (0..$#ch) {
151 foreach my $ib (0..$#ch) {
152 my $vab = $vab[$ia][$ib];
153 my $vba = $vab[$ib][$ia];
154 next unless $vab > $vba;
155 print "defeat: $choices[$ia] beats $choices[$ib] ($vab > $vba)\n";
156 $defeats->add_vertex($ia,$ib);
162 my ($def1,$def2) = @_;
163 my ($ia,$ix) = @$def1;
164 my ($ib,$iy) = @$def1;
165 return 1 if $vab[$ia][$ix] < $vab[$ib][$iy];
166 return 1 if $vab[$ia][$ix] == $vab[$ib][$iy]
167 && $vab[$ix][$ia] > $vab[$iy][$ib];
176 print "# transitive closure A.6(5)\n";
178 my $tdefeats = $defeats->transitive_closure();
180 print "# schwartz set A.6(6)\n";
182 $schwartz = $defeats->copy();
184 foreach my $ia (0..$#ch) {
185 foreach my $ib (0..$#ch) {
186 next if $tdefeats->has_edge($ia,$b);
187 next if !$tdefeats->has_edge($b,$ia);
188 print "not in Schwartz set: $choices[$ia] because $choices[$ib]\n";
189 $schwartz->delete_vertex($ia);
194 print "# dropping weakest defeats A.6(7)\n";
198 foreach my $edge (@{ $schwartz->edges() }) {
200 # no weakest edges yet
201 } elsif (weaker($edge, $weakest[0])) {
202 # this edge is weaker than previous weakest, start new set
204 } elsif (weaker($weakest[0], $edge)) {
205 # weakest edge is weaker than this one, ignore this one
208 # weakest edge is exactly as weak as this one, add this one
210 push @weakest, $edge;
213 last unless @weakest;
215 printf "weakest defeats %d > %d",
216 (scalar @{ $vab[$_->[0]][$_->[1]]) },
217 (scalar @{ $vab[$_->[1]][$_->[0]]) };
218 foreach my $weakest (@weakest) {
219 my ($ia,$ib) = @$weakest;
220 print "weakest defeat $choices[$ia] > $choices[$ib]\n";
221 $defeats->delete_edge($ia,$ib);
224 print "# defeats within the Schwartz set, round again\n";
227 print "# no defeats within the Schwartz set\n";
228 print "FINAL SCHWARTZ SET:\n";
230 print $choices[$_] foreach (@{ $schwartz->nodes() });