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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\UniLex\RegExp\FSM; |
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class NfaCalc |
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{ |
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private $nfa; |
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public function __construct(Nfa $nfa) |
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{ |
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$this->nfa = $nfa; |
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} |
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public function getEpsilonClosure(int ...$stateList): array |
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{ |
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$notProcessedStateList = $stateList; |
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$processedStateList = []; |
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while (!empty($notProcessedStateList)) { |
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$nextState = array_pop($notProcessedStateList); |
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$processedStateList[] = $nextState; |
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$stateEpsilonMoves = $this->getStateEpsilonMoves($nextState); |
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$newNotProcessedStateList = array_diff($stateEpsilonMoves, $processedStateList, $notProcessedStateList); |
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$notProcessedStateList = array_merge($notProcessedStateList, $newNotProcessedStateList); |
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} |
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sort($processedStateList); |
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return $processedStateList; |
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} |
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public function getSymbolMoves(int $symbolId, int ...$stateList): array |
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{ |
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$result = []; |
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foreach ($stateList as $stateId) { |
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$moveList = $this->getStateSymbolMoves($symbolId, $stateId); |
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$newMoveList = array_diff($moveList, $result); |
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$result = array_merge($result, $newMoveList); |
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} |
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sort($result); |
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return $result; |
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} |
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private function getStateSymbolMoves(int $symbolId, int $stateIn): array |
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{ |
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$moveList = $this |
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->nfa |
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->getSymbolTransitionMap() |
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->getExitList($stateIn); |
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$stateOutList = []; |
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foreach ($moveList as $stateOut => $symbolList) { |
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if (in_array($symbolId, $symbolList)) { |
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$stateOutList[] = $stateOut; |
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} |
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} |
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return $stateOutList; |
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} |
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private function getStateEpsilonMoves(int $stateIn): array |
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{ |
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$moveList = $this |
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->nfa |
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->getEpsilonTransitionMap() |
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->getExitList($stateIn); |
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$moveList[$stateIn] = true; |
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return array_keys($moveList); |
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} |
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} |
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remorhaz /
php-unilex
