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<?php
declare(strict_types=1);
namespace Laminas\Diactoros;
use Psr\Http\Message\StreamInterface;
use Stringable;
use function array_key_exists;
use const SEEK_SET;
/**
* Implementation of PSR HTTP streams
*/
class CallbackStream implements StreamInterface, Stringable
{
/** @var callable|null */
protected $callback;
/**
* @throws Exception\InvalidArgumentException
*/
public function __construct(callable $callback)
{
$this->attach($callback);
}
/**
* {@inheritdoc}
*/
public function __toString(): string
{
return $this->getContents();
}
/**
* {@inheritdoc}
*/
public function close(): void
{
$this->callback = null;
}
/**
* {@inheritdoc}
*
* @return null|callable
*/
public function detach(): ?callable
{
$callback = $this->callback;
$this->callback = null;
return $callback;
}
/**
* Attach a new callback to the instance.
*/
public function attach(callable $callback): void
{
$this->callback = $callback;
}
/**
* {@inheritdoc}
*/
public function getSize(): ?int
{
return null;
}
/**
* {@inheritdoc}
*/
public function tell(): int
{
throw Exception\UntellableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function eof(): bool
{
return empty($this->callback);
}
/**
* {@inheritdoc}
*/
public function isSeekable(): bool
{
return false;
}
/**
* {@inheritdoc}
*/
public function seek(int $offset, int $whence = SEEK_SET): void
{
throw Exception\UnseekableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function rewind(): void
{
throw Exception\UnrewindableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function isWritable(): bool
{
return false;
}
/**
* {@inheritdoc}
*/
public function write(string $string): int
{
throw Exception\UnwritableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function isReadable(): bool
{
return false;
}
/**
* {@inheritdoc}
*/
public function read(int $length): string
{
throw Exception\UnreadableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function getContents(): string
{
$callback = $this->detach();
$contents = $callback ? $callback() : '';
return (string) $contents;
}
/**
* {@inheritdoc}
*/
public function getMetadata(?string $key = null)
{
$metadata = [
'eof' => $this->eof(),
'stream_type' => 'callback',
'seekable' => false,
];
if (null === $key) {
return $metadata;
}
if (! array_key_exists($key, $metadata)) {
return null;
}
return $metadata[$key];
}
}