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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\UniLex\Parser\LL1\Lookup; |
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abstract class Set |
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{ |
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/** |
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* @var array |
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*/ |
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private $tokenMap = []; |
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/** |
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* This counter increases each time changes are made to set. |
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* |
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* @var int |
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*/ |
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private $changeCount = 0; |
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/** |
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* Adds list of tokens to the set. |
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* |
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* @param int $symbolId |
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* @param int ...$tokenIdList |
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*/ |
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public function addToken(int $symbolId, int ...$tokenIdList): void |
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{ |
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if (empty($tokenIdList)) { |
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return; |
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} |
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if (!isset($this->tokenMap[$symbolId])) { |
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$this->tokenMap[$symbolId] = $tokenIdList; |
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$this->increaseChangeCount(count($tokenIdList)); |
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return; |
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} |
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$newTokenIdList = array_diff($tokenIdList, $this->tokenMap[$symbolId]); |
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if (empty($newTokenIdList)) { |
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return; |
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} |
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$this->tokenMap[$symbolId] = array_merge($this->tokenMap[$symbolId], $newTokenIdList); |
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$this->increaseChangeCount(count($newTokenIdList)); |
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} |
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protected function increaseChangeCount(int $amount = 1): void |
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{ |
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$this->changeCount += $amount; |
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} |
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public function getTokens(int $symbolId): array |
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{ |
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return $this->tokenMap[$symbolId] ?? []; |
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} |
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/** |
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* Returns amount of changes since last reset. |
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* |
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* @return int |
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*/ |
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public function getChangeCount(): int |
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{ |
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return $this->changeCount; |
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} |
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/** |
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* Resets changes counter. |
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*/ |
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public function resetChangeCount(): void |
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{ |
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$this->changeCount = 0; |
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} |
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/** |
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* Merges token sets. |
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* |
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* @param int $targetSymbolId |
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* @param int $sourceSymbolId |
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*/ |
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public function mergeTokens(int $targetSymbolId, int $sourceSymbolId): void |
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{ |
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$this->addToken($targetSymbolId, ...$this->getTokens($sourceSymbolId)); |
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} |
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} |
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remorhaz /
php-unilex
