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<?php |
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/* |
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Part of BORDA COUNT method Module - From the original Condorcet PHP |
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Condorcet PHP - Election manager and results calculator. |
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Designed for the Condorcet method. Integrating a large number of algorithms extending Condorcet. Expandable for all types of voting systems. |
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By Julien Boudry and contributors - MIT LICENSE (Please read LICENSE.txt) |
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https://github.com/julien-boudry/Condorcet |
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*/ |
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declare(strict_types=1); |
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namespace Condorcet\Algo\Methods; |
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use Condorcet\Algo\Method; |
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use Condorcet\Algo\MethodInterface; |
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use Condorcet\Result; |
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class BordaCount extends Method implements MethodInterface |
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{ |
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// Method Name |
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public const METHOD_NAME = ['BordaCount','Borda Count','Borda','Méthode Borda']; |
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public static $starting = 1; |
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protected $_Stats; |
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protected function getStats () : array |
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{ |
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$stats = []; |
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foreach ($this->_Stats as $candidateKey => $oneScore) : |
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$stats[(string) $this->_selfElection->getCandidateId($candidateKey)] = $oneScore; |
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endforeach; |
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return $stats; |
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} |
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/////////// COMPUTE /////////// |
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//:: BORDA ALGORITHM. ::// |
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protected function compute () : void |
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{ |
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$score = []; |
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foreach ($this->_selfElection->getCandidatesList() as $oneCandidate) : |
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$score[$this->_selfElection->getCandidateKey($oneCandidate)] = 0; |
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endforeach; |
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foreach ($this->_selfElection->getVotesManager() as $oneVote) : |
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// Ignore vote who don't respect election constraints |
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if(!$this->_selfElection->testIfVoteIsValidUnderElectionConstraints($oneVote)) : |
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continue ; |
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endif; |
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$weight = ($this->_selfElection->isVoteWeightIsAllowed()) ? $oneVote->getWeight() : 1; |
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for ($i = 0 ; $i < $weight ; $i++) : |
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$CandidatesRanked = 0; |
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$oneRanking = $oneVote->getContextualRanking($this->_selfElection); |
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foreach ($oneRanking as $oneRank) : |
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$rankScore = 0; |
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foreach ($oneRank as $oneCandidateInRank) : |
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$rankScore += $this->getScoreByCandidateRanking($CandidatesRanked++); |
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endforeach; |
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foreach ($oneRank as $oneCandidateInRank) : |
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$score[$this->_selfElection->getCandidateKey($oneCandidateInRank)] += $rankScore / count($oneRank); |
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endforeach; |
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endforeach; |
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endfor; |
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endforeach; |
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arsort($score,SORT_NUMERIC); |
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$rank = 0; |
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$lastScore = null; |
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$result = []; |
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foreach ($score as $candidateKey => $candidateScore) : |
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if ($candidateScore === $lastScore) : |
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$result[$rank][] = $candidateKey; |
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else : |
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$result[++$rank] = [$candidateKey]; |
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$lastScore = $candidateScore; |
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endif; |
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endforeach; |
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$this->_Stats = $score; |
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$this->_Result = $this->createResult($result); |
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} |
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protected function getScoreByCandidateRanking (int $CandidatesRanked) : float |
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{ |
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return $this->_selfElection->countCandidates() + static::$starting - 1 - $CandidatesRanked; |
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} |
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} |
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julien-boudry /
Condorcet
