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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\Lexer\Runtime\Token; |
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use Iterator; |
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use IteratorAggregate; |
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use Remorhaz\Lexer\Runtime\IO\EmptyLexeme; |
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use Remorhaz\Lexer\Runtime\IO\LexemeInterface; |
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use Remorhaz\Lexer\Runtime\IO\PreviewBufferInterface; |
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final class TokenReader implements IteratorAggregate, TokenReaderInterface |
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{ |
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/** |
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* @var PreviewBufferInterface |
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*/ |
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private $previewBuffer; |
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/** |
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* @var MatcherSelectorInterface |
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*/ |
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private $matcherSelector; |
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/** |
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* @var int |
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*/ |
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private $offset = 0; |
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/** |
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* @var bool |
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*/ |
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private $isFinished = false; |
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public function __construct(PreviewBufferInterface $previewBuffer, MatcherSelectorInterface $tokenContext) |
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{ |
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$this->previewBuffer = $previewBuffer; |
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$this->matcherSelector = $tokenContext; |
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} |
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/** |
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* @return bool |
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* @psalm-pure |
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*/ |
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public function isFinished(): bool |
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{ |
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return $this->isFinished; |
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} |
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/** |
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* @return int |
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* @psalm-pure |
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*/ |
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public function getOffset(): int |
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{ |
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return $this->offset; |
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} |
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/** |
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* @return TokenInterface |
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*/ |
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public function read(): TokenInterface |
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{ |
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if ($this->isFinished) { |
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throw new Exception\UnexpectedEndOfInputException($this->getEmptyLexeme()->getStartOffsets()); |
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} |
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if ($this->previewBuffer->isFinished()) { |
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$this->isFinished = true; |
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return Token::createEoi($this->offset, $this->previewBuffer->getEmptyLexeme()); |
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} |
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do { |
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$matcher = $this->matcherSelector->getMatcher(); |
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$matchResult = $matcher->match($this->offset, $this->previewBuffer, $this->matcherSelector); |
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} while ($matchResult->shouldRepeat()); |
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$this->offset++; |
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return $matchResult->getToken(); |
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} |
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/** |
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* @return LexemeInterface |
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* @psalm-pure |
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*/ |
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public function getEmptyLexeme(): LexemeInterface |
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{ |
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return new EmptyLexeme($this->offset, $this->previewBuffer->getEmptyLexeme()); |
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} |
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/** |
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* @return Iterator |
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* @psalm-return Iterator<int, TokenInterface> |
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*/ |
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public function getIterator(): Iterator |
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{ |
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while (!$this->isFinished()) { |
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yield $this->getOffset() => $this->read(); |
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} |
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} |
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} |
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remorhaz /
php-lexer-runtime
