# to Debian Constitution A.6.
#
# usage: .../compute [<input files>...]
+# (uses stdin if none supplied)
#
-#
+# input files can be in any order and should contain lines like:
+#
+# <votername> :: <PREF>, (<PREF>=<PREF>), <PREF>, ....
+# V: <tallyprefs> <votername>
+# <ABBREV> = <description...>
+# <ABBREV> = <description...> [<rat>:<io>]
+# <ABBREV> = <description...> [default]
+# nodefault
+# quorum = <quorum>
+#
+# where
+#
+# <votername> is any non-whitespace characters
+#
+# <ABBREV> and <PREF> are abbreviations for choices on the ballot.
+# They must be ASCII alphanumeric. Numeric preferences are
+# not recommended as they are confusing (particularly when
+# tally sheets are in use).
+#
+# It is best to avoid FD, SQ and NOTA except for the default
+# option; if no default option is specified, it will default
+# to one of these unless a "nodefault" line is found.
+#
+# In the "::" form, the commas are optional. Either ( ) or = may
+# be used to indicate a set of equal preferences.
+#
+# <tallyprefs> is a tally sheet preference order: that is,
+# a single uppercase base36 digit for each ballot choice,
+# (in the order they were specified by "=" lines), giving
+# the voter's preference rank for that option. The numbers
+# need not be distinct or contiguous. "-" may be used for
+# unranked preferences.
+#
+# <rat>:<io> is the majority ratio for the option
+#
+# <quorum> is the quorum
+#
+# and also allowed are
+#
+# #-comments } all
+# blank lines } ignored
+# lines starting with whitespace }
use strict;
use utf8;
use autodie;
-use Data::Printer;
use Graph::Directed;
+use Graph::Writer::GraphViz;
binmode STDIN, 'encoding(UTF-8)';
binmode STDOUT, 'encoding(UTF-8)';
our $defcho;
our $quorum = 0;
+our $gfile;
+
+while (@ARGV && $ARGV[0] =~ /^-/) {
+ local $_ = shift @ARGV;
+ if (m/^--?$/) {
+ last;
+ } elsif (s/^-g//) {
+ $gfile = $_;
+ } else {
+ die "bad usage\n";
+ }
+}
+
sub addchoice {
my $choname = shift @_;
my $cho = $choices{$choname} = {
last if $defcho;
}
if ($defcho) {
- print "guessed default option was: $choices[$defcho->{Index}]\n";
+ print "guessed default option: $choices[$defcho->{Index}]\n";
} else {
print "could not guess default option, assuming there is none\n";
}
return 0;
}
+our $showg = $defeats->deep_copy();
+
our $schwartz;
for (;;) {
my $tdefeats = $defeats->transitive_closure();
+ # this makes the debugging output prettier
+ foreach my $ch (@choices) {
+ $tdefeats->delete_edge($ch,$ch);
+ }
print "closure graph: $tdefeats\n";
print "\nSchwartz set A.6(6)\n";
printf " %-5s %s\n", $_, $choices{$_}{Desc}
foreach ($schwartz->vertices());
+if (defined $gfile) {
+ foreach my $cho (values %choices) {
+ my $chn = $choices[$cho->{Index}];
+ my $label = "\\N\n$cho->{Desc}";
+ if ($cho->{Dropped}) {
+ $label .= "\nDropped: $cho->{Dropped}";
+ }
+ $showg->set_vertex_attribute($chn, 'label', $label);
+ }
+
+ my $gwriter = new Graph::Writer::GraphViz -format => 'ps';
+ $gwriter->write_graph($showg, $gfile);
+}
+
print ".\n";
#p %choices;