X-Git-Url: https://projects.mako.cc/source/selectricity/blobdiff_plain/3d349b24ddccc0ce66b72de9d9fd4b4326d8fe75..a1379415812ddd0e464aa3304b6fbb57ccf3373d:/lib/rubyvote/condorcet.rb?ds=sidebyside

diff --git a/lib/rubyvote/condorcet.rb b/lib/rubyvote/condorcet.rb
index 7153995..d0210ef 100644
--- a/lib/rubyvote/condorcet.rb
+++ b/lib/rubyvote/condorcet.rb
@@ -33,8 +33,6 @@
 
 class CondorcetVote < ElectionVote
   
-  attr_accessor :results
-
   def initialize(votes=nil)
     unless defined?(@candidates)
       @candidates = Array.new
@@ -46,7 +44,6 @@ class CondorcetVote < ElectionVote
       end
     end
     super(votes)
-    @results = Array.new
   end
 
   def tally_vote(vote=nil)
@@ -86,53 +83,24 @@ class CondorcetVote < ElectionVote
     end
   end
 
-  def results
-    if @results.size < 2 && (not @candidates.empty?)
-      tabulate
-    end
-    @results
-  end
-
-  def result
-    find_only_winner unless @winner
-    @winner
-  end
-
   protected
 
   def verify_vote(vote=nil)
     vote.instance_of?( Array ) and
       vote == vote.uniq
   end
-
-  def tabulate
-    find_only_winner unless @winner
-    until @candidates.empty? 
-      aResult = resultFactory( self )
-      @results << aResult.winners
-      filter_out(aResult)
-    end
-  end
-
-  def find_only_winner
-    @winner = resultFactory( self )
-    @results << @winner.winners
-    filter_out(@winner)
-  end
-
 end
 
 class PureCondorcetVote < CondorcetVote
-  def resultFactory(init)
-    PureCondorcetResult.new(init)
+  def result
+    PureCondorcetResult.new(self)
   end
 end
 
 class CloneproofSSDVote < CondorcetVote
-  def resultFactory(init)
-    CloneproofSSDResult.new(init)
+  def result
+    CloneproofSSDResult.new(self)
   end
-
 end
 
 
@@ -154,9 +122,10 @@ class CondorcetResult < ElectionResult
     @matrix = voteobj.votes
   end
   
-  def list_defeats
+  def victories_and_ties
     victors = Array.new
     ties = Array.new
+    victories = Hash.new
     candidates = @matrix.keys.sort
     
     candidates.each do |candidate|
@@ -169,20 +138,36 @@ class CondorcetResult < ElectionResult
           ties << [candidate, challenger] 
         end
       end
-    end
+    end  
     
-    victories = victors.sort {|a,b| b[2] <=> a[2]}
+    victors.each do |list|
+      if victories.has_key?(list[0])
+        victories[list[0]][list[1]] = list[2]       
+      else
+        victories[list[0]] = Hash.new
+        victories[list[0]][list[1]] = list[2]
+      end
+    end
     
     return victories, ties    
   end
+
+  def ranked_candidates
+    if not defined?(@ranked_candidates)
+      @ranked_candidates = build_ranked_candidates()
+    end
+
+    @ranked_candidates
+  end
         
   protected
   def defeats(candidates=nil, votes=nil)
-    candidates = @election.candidates unless candidates
-    votes = @election.votes unless votes
+    candidates ||= @election.candidates || []
+    # we're assumign that if there are candidates, there must be at
+    # least one vote for them
+    votes ||= @election.votes 
 
     defeats = Array.new
-    candidates = [candidates] unless candidates.class == Array
     candidates.each do |candidate|
       candidates.each do |challenger|
         next if candidate == challenger
@@ -194,6 +179,27 @@ class CondorcetResult < ElectionResult
 
     defeats
   end
+  
+  def build_ranked_candidates
+    # build a lis of ranked candidates by dropping the winner and
+    # cursing
+
+    ranked_candidates = []
+
+    resultobj = self.dup
+    candidates = self.election.candidates
+
+    until candidates.empty? 
+      ranked_candidates << resultobj.winners
+      
+      new_voteobj = resultobj.election.dup
+      candidates = new_voteobj.candidates
+      new_voteobj.candidates.delete_if {|x| resultobj.winners.include?(x)}
+      resultobj = new_voteobj.result
+    end
+
+    ranked_candidates
+  end
 
 end
 
@@ -208,10 +214,11 @@ class PureCondorcetResult < CondorcetResult
   def condorcet
     votes = @election.votes
     candidates = @election.candidates
-    unless votes.length>0 and candidates.length>0
-      @winners=[]
-      return @winners
+
+    unless votes.length > 0 and candidates.length > 0
+      return @winners=[]
     end
+
     victors = Hash.new
     candidates.each do |candidate|
       victors[candidate] = Array.new
@@ -241,14 +248,13 @@ class CloneproofSSDResult < CondorcetResult
   def initialize(voteobj=nil)
     super(voteobj)
     @winners = self.cpssd()
-    @winners.delete nil
   end
 
   protected
 
   def cpssd
     votes = @election.votes
-    candidates = *@election.candidates
+    candidates = @election.candidates.dup
 
     def in_schwartz_set?(candidate, candidates, transitive_defeats)
       candidates.each do |challenger|