From: <mako@atdot.cc>
Date: Sat, 18 Aug 2007 00:08:06 +0000 (-0400)
Subject: imported new version of ruby vote
X-Git-Url: https://projects.mako.cc/source/selectricity/commitdiff_plain/25d4636772a7c841f9af22ba63a16c633e315ba7?hp=729d45807f8d8e179e4a723c304336e1945acf67

imported new version of ruby vote
---

diff --git a/lib/rubyvote/condorcet.rb b/lib/rubyvote/condorcet.rb
index 7fda91b..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
 
 
@@ -170,8 +138,8 @@ class CondorcetResult < ElectionResult
           ties << [candidate, challenger] 
         end
       end
-    end
-     
+    end  
+    
     victors.each do |list|
       if victories.has_key?(list[0])
         victories[list[0]][list[1]] = list[2]       
@@ -183,6 +151,14 @@ class CondorcetResult < ElectionResult
     
     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)
@@ -203,6 +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
 
diff --git a/lib/rubyvote/election.rb b/lib/rubyvote/election.rb
index 5a58243..3655a03 100644
--- a/lib/rubyvote/election.rb
+++ b/lib/rubyvote/election.rb
@@ -66,10 +66,6 @@ class ElectionVote
     self.verify_vote(vote)
   end
 
-  def filter_out(winner)
-    @candidates.delete_if {|x| winner.winners.include?(x)}
-  end
-
 end
 
 class PluralityVote < ElectionVote
@@ -118,6 +114,7 @@ end
 
 class ElectionResult
   attr_reader :winners
+  attr_reader :election
 
   def initialize(voteobj=nil)
     unless voteobj and voteobj.kind_of?( ElectionVote )
@@ -135,7 +132,7 @@ class ElectionResult
   def winner?
     @winners.length > 0 and not @winners[0].nil?
   end
-
+  
 end
 
 class PluralityResult < ElectionResult