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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\Exception; |
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use Remorhaz\Lexer\Runtime\IO\LexemeInterface; |
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use Remorhaz\Lexer\Runtime\IO\Symbol; |
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use Remorhaz\Lexer\Runtime\IO\SymbolInterface; |
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use Remorhaz\Lexer\Runtime\IO\SymbolReaderInterface; |
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use Throwable; |
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final class TokenInput implements IteratorAggregate, SymbolReaderInterface |
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{ |
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public const ATTRIBUTE_SYMBOL_CODE = 'symbol.code'; |
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/** |
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* @var TokenReaderInterface |
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*/ |
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private $tokenReader; |
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public function __construct(TokenReaderInterface $tokenReader) |
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{ |
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$this->tokenReader = $tokenReader; |
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} |
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public function read(): SymbolInterface |
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{ |
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$token = $this->tokenReader->read(); |
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$attribute = $token->getAttributes()->get(self::ATTRIBUTE_SYMBOL_CODE); |
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try { |
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return new Symbol($token->getOffset(), $attribute->asInteger(), $token->getLexeme()); |
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} catch (Throwable $e) { |
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throw new Exception\InvalidSymbolCodeException($attribute, $e); |
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} |
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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->tokenReader->getOffset(); |
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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->tokenReader->isFinished(); |
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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 $this->tokenReader->getEmptyLexeme(); |
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} |
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/** |
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* @return Iterator |
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* @psalm-return Iterator<int,SymbolInterface> |
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*/ |
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public function getIterator(): Iterator |
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{ |
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while (!$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
