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<?php |
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/* |
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Part of RANKED PAIRS 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 CondorcetPHP\Condorcet\Algo\Methods; |
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use CondorcetPHP\Condorcet\Result; |
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use CondorcetPHP\Condorcet\Algo\{Method, MethodInterface}; |
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use CondorcetPHP\Condorcet\Algo\Tools\PairwiseStats; |
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// DODGSON is a Condorcet Algorithm | http://en.wikipedia.org/wiki/DODGSON_method |
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abstract class PairwiseStatsBased_Core extends Method implements MethodInterface |
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{ |
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protected $_Comparison; |
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protected $_countType; |
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/////////// PUBLIC /////////// |
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// Get the ranking |
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public function getResult () : Result |
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{ |
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// Cache |
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if ( $this->_Result !== null ) : |
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return $this->_Result; |
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endif; |
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////// |
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// Comparison calculation |
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$this->_Comparison = PairwiseStats::PairwiseComparison($this->_selfElection->getPairwise()); |
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// Ranking calculation |
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$this->makeRanking(); |
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// Return |
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return $this->_Result; |
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} |
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// Get the stats |
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protected function getStats () : array |
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{ |
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$explicit = []; |
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foreach ($this->_Comparison as $candidate_key => $value) : |
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$explicit[$this->_selfElection->getCandidateObjectFromKey($candidate_key)->getName()] = [$this->_countType => $value[$this->_countType]]; |
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endforeach; |
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return $explicit; |
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} |
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/////////// COMPUTE /////////// |
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//:: ALGORITHM. ::// |
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protected function makeRanking () : void |
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{ |
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$result = []; |
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// Calculate ranking |
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$challenge = []; |
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$rank = 1; |
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$done = 0; |
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foreach ($this->_Comparison as $candidate_key => $candidate_data) : |
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$challenge[$candidate_key] = $candidate_data[$this->_countType]; |
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endforeach; |
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while ($done < $this->_selfElection->countCandidates()) : |
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$looking = $this->looking($challenge); |
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foreach ($challenge as $candidate => $value) : |
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if ($value === $looking) : |
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$result[$rank][] = $candidate; |
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$done++; |
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unset($challenge[$candidate]); |
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endif; |
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endforeach; |
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$rank++; |
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endwhile; |
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$this->_Result = $this->createResult($result); |
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} |
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abstract protected function looking (array $challenge) : int; |
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} |
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julien-boudry /
Condorcet
