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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\Lexer\Runtime\IO; |
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use function array_merge; |
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use function array_shift; |
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/** |
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* @psalm-immutable |
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*/ |
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final class EmptyLexeme implements LexemeInterface |
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{ |
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/** |
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* @var int |
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*/ |
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private $offset; |
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/** |
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* @var LexemeInterface |
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*/ |
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private $constituentLexeme; |
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/** |
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* @param int ...$offsets |
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* @return LexemeInterface |
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* @psalm-pure |
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*/ |
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public static function fromOffsets(int ...$offsets): LexemeInterface |
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{ |
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return empty($offsets) |
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? new NullLexeme() |
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: new self(array_shift($offsets), self::fromOffsets(...$offsets)); |
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} |
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public function __construct(int $offset, LexemeInterface $constituentLexeme) |
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{ |
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if (!empty($constituentLexeme->getSymbols())) { |
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throw new Exception\NonEmptyLexemeException($constituentLexeme); |
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} |
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$this->constituentLexeme = $constituentLexeme; |
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$this->offset = $offset; |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @return SymbolInterface[] |
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* @psalm-return array<int, SymbolInterface> |
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* @psalm-pure |
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*/ |
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public function getSymbols(): array |
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{ |
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return []; |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @return int[] |
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* @psalm-return array<int, int> |
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*/ |
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public function getStartOffsets(): array |
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{ |
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return array_merge([$this->offset], $this->constituentLexeme->getStartOffsets()); |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @return int[] |
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* @psalm-return array<int, int> |
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*/ |
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public function getFinishOffsets(): array |
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{ |
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return array_merge([$this->offset], $this->constituentLexeme->getFinishOffsets()); |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @return LexemeInterface |
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* @psalm-pure |
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*/ |
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public function getConstituentLexeme(): LexemeInterface |
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{ |
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return $this->constituentLexeme; |
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} |
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} |
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remorhaz /
php-lexer-runtime
