X-Git-Url: https://projects.mako.cc/source/selectricity/blobdiff_plain/6dfbfbec4b0d01138c272649d668c5a872706a5c..3d349b24ddccc0ce66b72de9d9fd4b4326d8fe75:/lib/rubyvote/condorcet.rb

diff --git a/lib/rubyvote/condorcet.rb b/lib/rubyvote/condorcet.rb
index 65c664d..7153995 100644
--- a/lib/rubyvote/condorcet.rb
+++ b/lib/rubyvote/condorcet.rb
@@ -32,7 +32,7 @@
 ## the CloneproofSSDVote classes but should not be used directly.
 
 class CondorcetVote < ElectionVote
-
+  
   attr_accessor :results
 
   def initialize(votes=nil)
@@ -144,15 +144,39 @@ end
 ## directly.
 
 class CondorcetResult < ElectionResult
+  attr_reader :matrix
+  
   def initialize(voteobj=nil)
     unless voteobj and voteobj.kind_of?( CondorcetVote )
       raise ArgumentError, "You must pass a CondorcetVote array.", caller
     end
     super(voteobj)
+    @matrix = voteobj.votes
   end
-
+  
+  def list_defeats
+    victors = Array.new
+    ties = Array.new
+    candidates = @matrix.keys.sort
+    
+    candidates.each do |candidate|
+      candidates.each do |challenger|
+        next if candidate == challenger
+        diff = @matrix[candidate][challenger] - @matrix[challenger][candidate]
+        if diff > 0 
+          victors << [candidate, challenger, diff]
+        elsif diff == 0 && ties.include?([challenger, candidate]) == false
+          ties << [candidate, challenger] 
+        end
+      end
+    end
+    
+    victories = victors.sort {|a,b| b[2] <=> a[2]}
+    
+    return victories, ties    
+  end
+        
   protected
-
   def defeats(candidates=nil, votes=nil)
     candidates = @election.candidates unless candidates
     votes = @election.votes unless votes
@@ -180,11 +204,14 @@ class PureCondorcetResult < CondorcetResult
   end
 
   protected
-
+  
   def condorcet
     votes = @election.votes
     candidates = @election.candidates
-
+    unless votes.length>0 and candidates.length>0
+      @winners=[]
+      return @winners
+    end
     victors = Hash.new
     candidates.each do |candidate|
       victors[candidate] = Array.new
@@ -214,6 +241,7 @@ class CloneproofSSDResult < CondorcetResult
   def initialize(voteobj=nil)
     super(voteobj)
     @winners = self.cpssd()
+    @winners.delete nil
   end
 
   protected