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<?php |
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declare(strict_types=1); |
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namespace JsonDecodeStream\Source; |
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use ArrayIterator; |
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use IteratorIterator; |
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use JsonDecodeStream\Exception\SourceException; |
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use Throwable; |
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use Traversable; |
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class StringIteratorSource implements SourceInterface |
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{ |
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/** @var IteratorIterator */ |
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protected $stringIterator; |
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/** @var string|null */ |
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protected $previousPart; |
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/** @var callable|null */ |
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protected $stringIteratorFactory; |
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/** @var bool */ |
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protected $isRewoundInitially = false; |
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/** |
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* StringIteratorSource constructor. |
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* @param $iterable |
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* @throws SourceException |
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*/ |
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public function __construct($iterable) |
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{ |
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if (is_callable($iterable)) { |
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$this->stringIteratorFactory = $iterable; |
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$iterable = call_user_func($iterable); |
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} |
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$this->import($iterable); |
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} |
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/** |
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* @param $iterable array|iterable|Traversable |
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* @throws SourceException |
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*/ |
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protected function import($iterable) |
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{ |
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if (is_array($iterable)) { |
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$iterable = new ArrayIterator($iterable); |
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} |
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if ($iterable instanceof Traversable) { |
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$this->stringIterator = new IteratorIterator($iterable); |
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} else { |
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throw new SourceException( |
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'Can not iterate over ' |
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. (is_object($iterable) ? get_class($iterable) : gettype($iterable)) |
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); |
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} |
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$this->isRewoundInitially = false; |
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} |
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public function isEof(): bool |
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{ |
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return $this->isRewoundInitially && empty($this->previousPart) && !$this->stringIterator->valid(); |
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} |
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/** |
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* @param int $bytes |
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* @return string |
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* @throws SourceException |
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*/ |
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public function read(int $bytes): string |
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{ |
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if (!$this->isRewoundInitially && !$this->stringIterator->valid()) { |
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$this->stringIterator->rewind(); |
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$this->isRewoundInitially = true; |
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} |
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$part = $this->previousPart ?? ''; |
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$this->previousPart = null; |
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while (strlen($part) < $bytes && $this->stringIterator->valid()) { |
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$nextPart = $this->stringIterator->current(); |
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if (!is_string($nextPart)) { |
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throw new SourceException('Iterator provided a non-string value'); |
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} |
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$part .= $nextPart; |
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$this->stringIterator->next(); |
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} |
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if (strlen($part) > $bytes) { |
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$this->previousPart = substr($part, $bytes); |
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$part = substr($part, 0, $bytes); |
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} |
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return $part; |
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} |
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/** |
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* @throws SourceException |
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*/ |
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public function rewind(): void |
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{ |
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if (!$this->isRewoundInitially) { |
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return; |
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} |
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try { |
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if ($this->stringIteratorFactory) { |
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$recreatedIterator = call_user_func($this->stringIteratorFactory); |
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$this->import($recreatedIterator); |
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} else { |
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$this->stringIterator->rewind(); |
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} |
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} catch (Throwable $exception) { |
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throw new SourceException('This iterator is not rewindable', 0, $exception); |
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} |
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1 |
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} |
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} |
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klkvsk /
json-decode-stream
