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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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final class NfaReverser |
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{ |
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public function reverseNfa(Nfa $sourceNfa): Nfa |
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{ |
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$targetNfa = new Nfa(); |
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$targetNfa->setSymbolTable($sourceNfa->getSymbolTable()); |
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$sourceStateMap = $sourceNfa->getStateMap(); |
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$targetStateMap = $targetNfa->getStateMap(); |
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foreach ($sourceStateMap->getStateList() as $stateId) { |
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$targetStateMap->importState($sourceStateMap->getStateValue($stateId), $stateId); |
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} |
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$targetStateMap->addFinishState(...$sourceStateMap->getStartStateList()); |
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$targetStateMap->addStartState(...$sourceStateMap->getFinishStateList()); |
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foreach ($sourceNfa->getEpsilonTransitionMap()->getTransitionList() as $sourceStateId => $targetStates) { |
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foreach ($targetStates as $targetStateId => $value) { |
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$targetNfa->getEpsilonTransitionMap()->addTransition($targetStateId, $sourceStateId, $value); |
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} |
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} |
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foreach ($sourceNfa->getSymbolTransitionMap()->getTransitionList() as $sourceStateId => $targetStates) { |
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foreach ($targetStates as $targetStateId => $value) { |
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$targetNfa->getSymbolTransitionMap()->addTransition($targetStateId, $sourceStateId, $value); |
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} |
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} |
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return $targetNfa; |
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} |
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public function reverseDfa(Dfa $sourceDfa): Nfa |
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{ |
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$targetNfa = new Nfa(); |
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$targetNfa->setSymbolTable($sourceDfa->getSymbolTable()); |
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$sourceStateMap = $sourceDfa->getStateMap(); |
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$targetStateMap = $targetNfa->getStateMap(); |
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foreach ($sourceStateMap->getStateList() as $stateId) { |
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$targetStateMap->importState($sourceStateMap->getStateValue($stateId), $stateId); |
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} |
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$targetStateMap->addFinishState(...$sourceStateMap->getStartStateList()); |
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$targetStateMap->addStartState(...$sourceStateMap->getFinishStateList()); |
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foreach ($sourceDfa->getTransitionMap()->getTransitionList() as $sourceStateId => $targetStates) { |
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foreach ($targetStates as $targetStateId => $value) { |
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$targetNfa->getSymbolTransitionMap()->addTransition($targetStateId, $sourceStateId, $value); |
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} |
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} |
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return $targetNfa; |
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} |
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} |
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remorhaz /
php-unilex
