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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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use Remorhaz\UniLex\Exception; |
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class TransitionMap |
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{ |
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private $stateMap; |
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private $transitionMap = []; |
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public function __construct(StateMapInterface $stateMap) |
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{ |
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$this->stateMap = $stateMap; |
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} |
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/** |
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* @param int $fromStateId |
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* @param int $toStateId |
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* @param $data |
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* @throws Exception |
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*/ |
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public function addTransition(int $fromStateId, int $toStateId, $data): void |
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{ |
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if ($this->transitionExists($fromStateId, $toStateId)) { |
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throw new Exception("Transition {$fromStateId}->{$toStateId} is already added"); |
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} |
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$this->replaceTransition($fromStateId, $toStateId, $data); |
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} |
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/** |
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* @param int $fromStateId |
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* @param int $toStateId |
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* @param $data |
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* @throws Exception |
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*/ |
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public function replaceTransition(int $fromStateId, int $toStateId, $data): void |
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{ |
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[$validFromStateId, $validToStateId] = $this->getValidTransitionStates($fromStateId, $toStateId); |
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$this->transitionMap[$validFromStateId][$validToStateId] = $data; |
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} |
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/** |
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* @param int $fromStateId |
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* @param int $toStateId |
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* @return bool |
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* @throws Exception |
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*/ |
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public function transitionExists(int $fromStateId, int $toStateId): bool |
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{ |
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[$validFromStateId, $validToStateId] = $this->getValidTransitionStates($fromStateId, $toStateId); |
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return isset($this->transitionMap[$validFromStateId][$validToStateId]); |
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} |
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/** |
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* @param int $fromStateId |
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* @param int $toStateId |
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* @return mixed |
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* @throws Exception |
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*/ |
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public function getTransition(int $fromStateId, int $toStateId) |
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{ |
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if (!$this->transitionExists($fromStateId, $toStateId)) { |
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throw new Exception("Transition {$fromStateId}->{$toStateId} is not defined"); |
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} |
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[$validFromStateId, $validToStateId] = $this->getValidTransitionStates($fromStateId, $toStateId); |
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return $this->transitionMap[$validFromStateId][$validToStateId]; |
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} |
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public function getTransitionList(): array |
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{ |
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return $this->transitionMap; |
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} |
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public function getExitList(int $stateIn): array |
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{ |
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return $this->transitionMap[$stateIn] ?? []; |
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} |
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public function getEnterList(int $stateOut): array |
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{ |
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$result = []; |
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foreach ($this->transitionMap as $stateIn => $stateOutMap) { |
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if (isset($stateOutMap[$stateOut])) { |
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$result[$stateIn] = $stateOutMap[$stateOut]; |
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} |
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} |
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return $result; |
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} |
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public function onEachTransition(callable $callback): void |
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{ |
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foreach ($this->transitionMap as $stateIn => $stateOutMap) { |
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foreach ($stateOutMap as $stateOut => $data) { |
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call_user_func($callback, $data, $stateIn, $stateOut); |
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} |
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} |
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} |
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public function replaceEachTransition(callable $callback): void |
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{ |
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$replaceCallback = function ($data, int $stateIn, int $stateOut) use ($callback) { |
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$newData = call_user_func($callback, $data, $stateIn, $stateOut); |
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$this->replaceTransition($stateIn, $stateOut, $newData); |
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}; |
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$this->onEachTransition($replaceCallback); |
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} |
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/** |
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* @param int $fromStateId |
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* @param int $toStateId |
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* @return array |
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* @throws Exception |
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*/ |
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private function getValidTransitionStates(int $fromStateId, int $toStateId): array |
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{ |
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if (!$this->stateMap->stateExists($fromStateId)) { |
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throw new Exception("Invalid transition start state: {$fromStateId}"); |
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} |
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if (!$this->stateMap->stateExists($toStateId)) { |
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throw new Exception("Invalid transition finish state: {$toStateId}"); |
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} |
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return [$fromStateId, $toStateId]; |
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} |
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} |
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remorhaz /
php-unilex
