#!/usr/bin/perl -w
+#
+# parses some input about ballots and computes the result according
+# to Debian Constitution A.6.
+#
+# usage: .../compute [<input files>...]
+#
+#
+
use strict;
use utf8;
use autodie;
sub addchoice {
my $choname = shift @_;
- my $cho = $choices{$choname} = { @_, Index => (scalar @choices) };
+ my $cho = $choices{$choname} = {
+ @_, Index => (scalar @choices)
+ };
push @choices, $choname;
return $cho;
}
push @invotes_cc, [ $1, "$'" ];
} elsif (m/^quorum = ([0-9.]+)$/) {
$quorum = $1+0.0;
+ } elsif (m/^nodefault$/) {
+ $defcho = { Index => -1 }
} else {
die "invalid input";
}
}
-$defcho ||= $choices{FD};
-if (!$defcho) {
- $defcho = addchoice('FD', Desc => "Further Discussion");
-}
-my $defi = $defcho->{Index};
-die "FD has smaj?!" if $defcho->{Smaj};
-
our @vab;
# $vab[$ia][$ib] = V(A,B)
# Actually, it's a list of voters who prefer A to B (A.6(3)(1))
# Go through the voters and construct V(A,B)
-print "\nPreference matrix\n";
+print "\nParsing \`simple' style ballots\n";
+# actually, we pre-parse them into @invotes_v
+# since we want to show them as a tally sheet anyway
foreach my $iv (@invotes_cc) {
$_ = uc $iv->[1];
foreach my $chn (m/\b\w+\b/g) {
- $choices{$chn} or addchoice($chn, Desc => "($chn from voter ballot)");
+ next if $choices{$chn};
+ addchoice($chn, Desc => "($chn from voter ballot)");
}
}
foreach (split /\s+/) {
foreach (split /=/) {
my $cho = $choices{$_};
- $cho or die "unknown option $_ ($voter)";
+ $cho or die "unknown choice $_ ($voter)";
my $ix = $cho->{Index};
$ranks[$ix] = $rank;
}
push @invotes_v, [ $vstr, $voter ];
}
+print "\nDetermining default option\n";
+
+if ($defcho && $defcho->{Index} > -1) {
+ print "default option was specified: $choices[$defcho->{Index}]\n";
+} elsif ($defcho) {
+ print "no default option\n";
+} else {
+ foreach my $try (qw(FD SQ NOTA)) {
+ $defcho = $choices{$try};
+ last if $defcho;
+ }
+ if ($defcho) {
+ print "guessed default option was: $choices[$defcho->{Index}]\n";
+ } else {
+ print "could not guess default option, assuming there is none\n";
+ }
+}
+
+my $defi = $defcho->{Index};
+die "FD has smaj?!" if $defcho->{Smaj};
+
+print "\nParsing devotee tally sheet ballots\n";
+
foreach my $iv (@invotes_v) {
my ($votestr,$voter) = @$iv;
eval {
die "voter $voter $@" if $@;
}
+print "\nPreference matrix\n";
+
our @ch = map { $choices{$_} } @choices;
# Print the counts V(A,B)
$ch[$i]{Dropped} = $why;
}
-print "\nQuorum A.6(2) (quorum is $quorum)\n";
+if (defined $defi) {
+ print "\nQuorum A.6(2) (quorum is $quorum)\n";
-foreach my $i (0..$#choices) {
- next if $ch[$i]{Dropped};
- next if $i == $defi;
- my $v = $vab[$i][$defi];
- next if $v >= $quorum;
- drop $i, "quorum ($v < $quorum)";
-}
+ foreach my $i (0..$#choices) {
+ next if $ch[$i]{Dropped};
+ next if $i == $defi;
+ my $v = $vab[$i][$defi];
+ next if $v >= $quorum;
+ drop $i, "quorum ($v < $quorum)";
+ }
-print "\nMajority ratio A.6(3)\n";
-
-foreach my $i (0..$#choices) {
- next if $ch[$i]{Dropped};
- next if $i == $defi;
- my $majr = $ch[$i]{Smaj};
- $majr ||= [1,1]; # A.6(3)(3)
- my $vad = scalar @{ $vab[$i][$defi] };
- my $vda = scalar @{ $vab[$defi][$i] };
- next if $vad * $majr->[1] > $vda * $majr->[0];
- drop $i, "majority ratio ($vad * $majr->[1] <= $vda * $majr->[0])";
+ print "\nMajority ratio A.6(3)\n";
+
+ foreach my $i (0..$#choices) {
+ next if $ch[$i]{Dropped};
+ next if $i == $defi;
+ my $majr = $ch[$i]{Smaj};
+ $majr ||= [1,1]; # A.6(3)(3)
+ my $vad = scalar @{ $vab[$i][$defi] };
+ my $vda = scalar @{ $vab[$defi][$i] };
+ next if $vad * $majr->[1] > $vda * $majr->[0];
+ drop $i, "majority ratio ($vad * $majr->[1] <= $vda * $majr->[0])";
+ }
}
print "\nDefeats A.6(4)\n";