--- /dev/null
+# election library -- a ruby library for elections
+# copyright © 2005 MIT Media Lab and Benjamin Mako Hill
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+
+# 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. See the GNU
+# General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+#################################################################
+## ==== positional.rb ====
+##
+## This file contains positional election methods. Currently only
+## includes an implementation of the Borda count election method.
+#################################################################
+
+##################################################################
+## BordaVote and BordaResult Classes
+##
+## These classes inherit from and/or are modeled after the classes in
+## election.rb and condorcet.rb
+
+class BordaVote < ElectionVote
+
+ def initialize(votes=nil)
+ @candidates = Array.new
+ votes.each do |vote|
+ @candidates = vote.uniq if vote.uniq.length > candidates.length
+ end
+ super(votes)
+ end
+
+ def tally_vote(vote)
+ points = candidates.length - 1
+ vote.each do |candidate|
+ @votes[candidate] = points
+ points -= 1
+ end
+ end
+
+ def verify_vote(vote=nil)
+ vote.instance_of?( Array ) and
+ vote == vote.uniq
+ end
+
+ def result
+ BordaResult.new(self)
+ end
+end
+
+class BordaResult < ElectionResult
+ def initialize(voteobj=nil)
+ super(voteobj)
+ votes = @election.votes
+
+ @ranked_candidates = votes.sort do |a, b|
+ b[1] <=> a[1]
+ end.collect {|i| i[0]}
+
+ @winners = @ranked_candidates.find_all do |i|
+ votes[i] == votes[@ranked_candidates[0]]
+ end
+ end
+
+end