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<?php
namespace gipfl\Stream;
use Evenement\EventEmitterTrait;
use React\EventLoop\LoopInterface;
use React\Stream\WritableStreamInterface;
use function strlen;
use function strpos;
use function substr;
class BufferedLineReader implements WritableStreamInterface
{
use EventEmitterTrait;
/** @var LoopInterface */
protected $loop;
protected $buffer = '';
protected $writable = true;
/** @var string */
protected $separator;
/** @var int */
protected $separatorLength;
protected $process;
// protected $maxBufferSize; // Not yet. Do we need this?
/**
* @param string $separator
* @param LoopInterface $loop
*/
public function __construct($separator, LoopInterface $loop)
{
$this->loop = $loop;
$this->separator = $separator;
$this->separatorLength = strlen($separator);
$this->process = function () {
$this->processBuffer();
};
}
protected function processBuffer()
{
$lastPos = 0;
while (false !== ($pos = strpos($this->buffer, $this->separator, $lastPos))) {
$this->emit('line', [substr($this->buffer, $lastPos, $pos - $lastPos)]);
$lastPos = $pos + $this->separatorLength;
}
if ($lastPos !== 0) {
$this->buffer = substr($this->buffer, $lastPos);
}
}
public function isWritable()
{
return $this->writable;
}
public function write($data)
{
if (! $this->writable) {
return false;
}
$this->buffer .= $data;
if (strpos($data, $this->separator) !== false) {
$this->loop->futureTick($this->process);
}
return true;
}
public function end($data = null)
{
if ($data !== null) {
$this->buffer .= $data;
}
$this->close();
}
public function close()
{
$this->writable = false;
$this->processBuffer();
$remainingBuffer = $this->buffer;
$this->buffer = '';
if ($length = strlen($remainingBuffer)) {
$this->emit('error', [new \Exception(sprintf(
'There are %d unprocessed bytes in our buffer: %s',
$length,
substr($remainingBuffer, 0, 64)
))]);
}
$this->emit('close');
}
}
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