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<?php |
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namespace Remorhaz\UniLex\RegExp\FSM; |
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use Remorhaz\UniLex\Exception; |
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use function count; |
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class Nfa |
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{ |
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private $stateMap; |
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private $epsilonTransitionMap; |
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private $symbolTransitionMap; |
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private $symbolTable; |
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public function getStateMap(): StateMap |
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{ |
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if (!isset($this->stateMap)) { |
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$this->stateMap = new StateMap(); |
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} |
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return $this->stateMap; |
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} |
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public function joinStartStates(): void |
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{ |
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$startStateList = $this->getStateMap()->getStartStateList(); |
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if (count($startStateList) < 2) { |
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return; |
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} |
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$newStartStateId = $this->getStateMap()->createState([]); |
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foreach ($startStateList as $oldStartStateId) { |
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$this->getEpsilonTransitionMap()->addTransition($newStartStateId, $oldStartStateId, true); |
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} |
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$this->getStateMap()->replaceStartStateList($newStartStateId); |
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} |
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public function getEpsilonTransitionMap(): TransitionMap |
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{ |
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if (!isset($this->epsilonTransitionMap)) { |
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$this->epsilonTransitionMap = new TransitionMap($this->getStateMap()); |
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} |
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return $this->epsilonTransitionMap; |
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} |
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public function getSymbolTransitionMap(): TransitionMap |
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{ |
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if (!isset($this->symbolTransitionMap)) { |
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$this->symbolTransitionMap = new TransitionMap($this->getStateMap()); |
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} |
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return $this->symbolTransitionMap; |
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} |
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public function getSymbolTable(): SymbolTable |
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{ |
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if (!isset($this->symbolTable)) { |
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$this->symbolTable = new SymbolTable(); |
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} |
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return $this->symbolTable; |
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} |
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public function setSymbolTable(SymbolTable $symbolTable): void |
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{ |
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if (isset($this->symbolTable)) { |
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throw new Exception("Symbol table already exists in DFA"); |
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} |
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$this->symbolTable = $symbolTable; |
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} |
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} |
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remorhaz /
php-unilex
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