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<?php |
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/* |
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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; |
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use Condorcet\CondorcetVersion; |
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use Condorcet\Election; |
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use Condorcet\Timer\Chrono as Timer_Chrono; |
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class Pairwise implements \ArrayAccess, \Iterator |
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{ |
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use CondorcetVersion; |
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// Implement ArrayAccess |
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public function offsetSet($offset, $value) : void {} |
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public function offsetExists($offset) : bool { |
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return isset($this->_Pairwise[$offset]); |
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} |
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public function offsetUnset($offset) : void {} |
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public function offsetGet($offset) : ?array { |
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return $this->_Pairwise[$offset] ?? null; |
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} |
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// Implement Iterator |
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private $valid = true; |
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public function rewind() : void { |
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reset($this->_Pairwise); |
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$this->valid = true; |
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} |
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public function current() : array { |
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return $this->_Pairwise[$this->key()]; |
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} |
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public function key() : ?int { |
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return key($this->_Pairwise); |
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} |
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public function next() : void { |
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if (next($this->_Pairwise) === false) : |
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$this->valid = false; |
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endif; |
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} |
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public function valid() : bool { |
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return $this->valid; |
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} |
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// Pairwise |
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protected $_Election; |
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protected $_Pairwise = []; |
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public function __construct (Election &$link) |
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{ |
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$this->setElection($link); |
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$this->doPairwise(); |
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} |
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public function __clone () |
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{ |
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$this->_Election = null; |
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} |
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public function setElection (Election $election) : void |
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{ |
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$this->_Election = $election; |
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} |
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public function getExplicitPairwise () : array |
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{ |
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$explicit_pairwise = []; |
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foreach ($this->_Pairwise as $candidate_key => $candidate_value) : |
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$candidate_name = $this->_Election->getCandidateId($candidate_key, true); |
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foreach ($candidate_value as $mode => $mode_value) : |
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foreach ($mode_value as $candidate_list_key => $candidate_list_value) : |
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$explicit_pairwise[$candidate_name][$mode][$this->_Election->getCandidateId($candidate_list_key, true)] = $candidate_list_value; |
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endforeach; |
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endforeach; |
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endforeach; |
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return $explicit_pairwise; |
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} |
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protected function doPairwise () : void |
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{ |
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// Chrono |
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new Timer_Chrono ( $this->_Election->getTimerManager(), 'Do Pairwise' ); |
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$this->formatNewpairwise(); |
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// Win && Null |
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foreach ( $this->_Election->getVotesManager() as $vote_id => $oneVote ) : |
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$vote_ranking = $oneVote->getContextualRanking($this->_Election); |
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$voteWeight = ($this->_Election->isVoteWeightIsAllowed()) ? $oneVote->getWeight() : 1; |
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$vote_candidate_list = (function (array $r) : array { $list = []; |
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foreach ($r as $rank) : |
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foreach ($rank as $oneCandidate) : |
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$list[] = $oneCandidate; |
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endforeach; |
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endforeach; |
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return $list;})($vote_ranking); |
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$done_Candidates = []; |
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foreach ($vote_ranking as $candidates_in_rank) : |
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$candidates_in_rank_keys = []; |
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foreach ($candidates_in_rank as $candidate) : |
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$candidates_in_rank_keys[] = $this->_Election->getCandidateKey($candidate); |
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endforeach; |
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foreach ($candidates_in_rank as $candidate) : |
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$candidate_key = $this->_Election->getCandidateKey($candidate); |
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// Process |
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foreach ( $vote_candidate_list as $g_Candidate ) : |
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$g_candidate_key = $this->_Election->getCandidateKey($g_Candidate); |
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if ($candidate_key === $g_candidate_key) : |
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continue; |
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endif; |
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// Win & Lose |
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if ( !in_array($g_candidate_key, $done_Candidates, true) && |
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!in_array($g_candidate_key, $candidates_in_rank_keys, true) ) : |
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$this->_Pairwise[$candidate_key]['win'][$g_candidate_key] += $voteWeight; |
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$this->_Pairwise[$g_candidate_key]['lose'][$candidate_key] += $voteWeight; |
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$done_Candidates[] = $candidate_key; |
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// Null |
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elseif (in_array($g_candidate_key, $candidates_in_rank_keys, true)) : |
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$this->_Pairwise[$candidate_key]['null'][$g_candidate_key] += $voteWeight; |
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endif; |
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endforeach; |
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endforeach; |
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endforeach; |
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endforeach; |
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} |
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protected function formatNewpairwise () : void |
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{ |
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foreach ( $this->_Election->getCandidatesList(false) as $candidate_key => $candidate_id ) : |
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$this->_Pairwise[$candidate_key] = [ 'win' => [], 'null' => [], 'lose' => [] ]; |
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foreach ( $this->_Election->getCandidatesList(false) as $candidate_key_r => $candidate_id_r ) : |
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if ($candidate_key_r !== $candidate_key) : |
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$this->_Pairwise[$candidate_key]['win'][$candidate_key_r] = 0; |
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$this->_Pairwise[$candidate_key]['null'][$candidate_key_r] = 0; |
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$this->_Pairwise[$candidate_key]['lose'][$candidate_key_r] = 0; |
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endif; |
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endforeach; |
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endforeach; |
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} |
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} |
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julien-boudry /
Condorcet
