/** * @param \Helstern\Nomsky\Grammar\Symbol\SymbolSet $set * @param NormalizedProduction $production * @param \Helstern\Nomsky\GrammarAnalysis\ParseSets\ParseSets $followSets * @param \Helstern\Nomsky\GrammarAnalysis\ParseSets\ParseSets $firstSets * * @return bool */ public function processProduction(SymbolSet $set, NormalizedProduction $production, ParseSets $followSets, ParseSets $firstSets) { $rhs = $production->getRightHandSide(); $epsilonAdded = $this->firstSetCalculator->processSymbolList($set, $rhs, $firstSets); if ($epsilonAdded) { $lhs = $production->getLeftHandSide(); $otherSet = $followSets->getTerminalSet($lhs); $set->addAll($otherSet); } return $epsilonAdded; }
/** * @param \Helstern\Nomsky\Grammar\Symbol\SymbolSet $set * @param SymbolOccurrence $occurrence * @param \Helstern\Nomsky\GrammarAnalysis\ParseSets\ParseSets $followSets * @param \Helstern\Nomsky\GrammarAnalysis\ParseSets\ParseSets $firstSets * * @return bool */ public function processOccurrence(SymbolSet $set, SymbolOccurrence $occurrence, ParseSets $followSets, ParseSets $firstSets) { $symbol = $occurrence->getSymbol(); $isTerminal = SymbolTypeEquals::newInstanceMatchingTerminals(); if ($isTerminal->matchSymbol($symbol)) { return false; } $following = $occurrence->getFollowing(); $epsilonAdded = $this->firstSetCalculator->processSymbolList($set, $following, $firstSets); if ($epsilonAdded) { $set->remove(new EpsilonSymbol()); $lhs = $occurrence->getProductionNonTerminal(); $otherSet = $followSets->getTerminalSet($lhs); $set->addAll($otherSet); } return true; }