use utf8;
use autodie;
use bigrat;
+use List::MoreUtils qw(nsort_by);
# vote is
# { Voter => opaque,
}
}
+our @elected; # $elected[] = $candidate
+
+our @unsorted = @allvotes;
+
+our %sorted;
+# $sorted{$firstpref}{Votes} = [ $vote, ... ]
+# $sorted{$firstpref}{Cand} = $firstpref
+# $sorted{$firstpref}{Total} = $totalweight
+our @sorted; # values same as %sorted
+our @surpluses; # values same as %sorted
+
+our @exhausted; # votes
+
+our %continuing; # $continuing{$candidate}=1
+
+our @stagerecord; # $stagerecord[]{$candidate} = $total
+
+foreach my $vote (@allvotes) {
+ $continuing{$_}=1 foreach @{ $vote->{Prefs} };
+}
+
for (;;) {
$stage++;
- my %sorted;
- # $sorted{firstpref}{Votes} = [ $vote, ... ]
- # $sorted{firstpref}{Total} = [ $vote, ... ]
- for my $vote (@allvotes) {
- next unless @{ $vote->{Prefs} };
- my $firstpref = $vote->{Prefs}[0];
- push @{ $sorted{$firstpref}{Votes} }, $vote;
+ while (my $vote = shift @unsorted) {
+ my ($firstpref) = grep { $continuing{$_} } @{ $vote->{Prefs} };
+ if (!defined $firstpref) {
+ votelog $vote, "ballot exhausted";
+ push @exhausted, $vote;
+ } else {
+ push @{ $sorted{$firstpref}{Votes} }, $vote;
+ }
}
+ $sorted{$_}{Cand} = $_ foreach keys %sorted;
foreach my $firstpref (sort keys %sorted) {
foreach my $vote (@{ $sorted{$firstpref}{Votes} }) {
votelog $vote, "counted $vote->{Weight} for $firstpref";
$sorted{$firstpref}{Total} += $vote->{Weight};
}
}
- my @sorted = sort {
- $sorted{$b}{Total} <=> $sorted{$a}{Total};
- } keys %sorted;
+ my @sorted = nsort_by { -$_->{Total} } values %sorted;
+
+ push @stagerecord, { map { ($_->{Cand}, $_->{Total}) } @sorted };
my $totalvalid = 0;
- foreach my $firstpref (@sorted) {
- $sorted{$firstpref}{Total} += $_->{Weight}
- foreach @{ $sorted{$firstpref}{Votes} };
- printf "%10s %s\n", $firstpref, pr $sorted{$firstpref}{Total};
- $totalvalid += $sorted{$firstpref}{Total};
+ my $countvalid = sub {
+ my ($l, $what) = @_;
+ foreach my $s (@$l) {
+ printf "%-7s %10s %s\n", $what, $s->{Cand}, pr $s->{Total};
+ $totalvalid += $s->{Total};
+ }
+ };
+ $countvalid->(\@sorted, '1stpref');
+ $countvalid->(\@surpluses, 'surplus');
+
+ printf "%7s %10s %s\n", 'TOTAL', '', pr $totalvalid;
+
+ unless ($totalvalid > 0) {
+ printf "No more votes!\n";
+ last;
+ }
+
+ my $placesremain = $places - @elected;
+
+ unless ($placesremain > 0) {
+ printf "Complete.\n";
+ last;
}
- printf "%10s %s\n", 'TOTAL', pr $totalvalid;
- last unless $totalvalid > 0;
+ my $quota = $totalvalid / ($placesremain + 1);
+ printf "%7s %10s %s\n", '', 'quota', pr $quota;
- my $quota = $totalvalid / ($places + 1);
- printf "\nquota = %10s\n", pr $quota;
+ my $need_to_transfer_surplus = 1;
- my $topfirst = $sorted[0];
- my $topvoters = $sorted{$topfirst}{Weight};
- my $surplus = $topvoters - $quota;
- if ($surplus >= 0) {
- printf "%10s ELECTED\n", $sorted[0];
+ # Look for people to elect.
+ # We elect as many as we can, rather than recomputing the (lower) quota
+ # (ERS rules 5.4.9)
+ for (;;) {
+ my $s = $sorted[0];
+ my $topvoters = $s->{Weight};
+ my $surplus = $topvoters - $quota;
+ last unless $surplus > 0;
- # transfer the surplus
- my $weightmult = $surplus / $topvoters;
- foreach my $vote (@{ $sorted{$topfirst}{Votes} }) {
- votelog $vote, "part of surplus of weight $weightmult";
- $vote->{Weight} *= $weightmult;
+ printf "%7s %10s\n", 'ELECTED', $s->{Cand};
+ push @elected, $s->{Cand};
+
+ my $derate = $topvoters / $surplus;
+ printf "%7s %10s\n", 'derate', $s->{Cand}, pr $derate;
+
+ foreach my $vote (@{ $s->{Votes} }) {
+ votelog $vote, "elected $s->{Cand}, derated $weightmult";
+ $vote->{Weight} /= $derate;
}
+ shift @sorted;
+ push @surpluses, $s;
+ delete %sorted->{ $s->{Cand} };
+ delete $continuing{ $s->{Cand} };
+
+ $need_to_transfer_surplus = 0;
+ # before actually transferring a surplus, we will consider
+ # eliminating, and then reconsider with a lower quota
+ }
+
+ # Look for people to eliminate
+ # We eliminate before trying to transfer surpluses
+ # ERS 5.2.5
+
+
+ # transfer the surplus
filterout $topfirst, "candidate was elected";
} else {
my $elim = $sorted{ $#sorted };