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<?php
/*
* This file is part of the webmozart/console package.
*
* (c) Bernhard Schussek <bschussek@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Webmozart\Console\IO\InputStream;
use Webmozart\Assert\Assert;
use Webmozart\Console\Api\IO\InputStream;
use Webmozart\Console\Api\IO\IOException;
/**
* An input stream that reads from a PHP stream.
*
* @since 1.0
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class StreamInputStream implements InputStream
{
/**
* @var resource
*/
private $stream;
/**
* Creates the input.
*
* @param resource $stream A stream resource.
*/
public function __construct($stream)
{
Assert::resource($stream, 'stream');
$this->stream = $stream;
// Not all streams are seekable
@rewind($this->stream);
}
/**
* {@inheritdoc}
*/
public function read($length)
{
if (null === $this->stream) {
throw new IOException('Cannot read from a closed input.');
}
if (feof($this->stream)) {
return null;
}
$data = fread($this->stream, $length);
if (false === $data && !feof($this->stream)) {
throw new IOException('Could not read stream.');
}
return $data ?: null;
}
/**
* {@inheritdoc}
*/
public function readLine($length = null)
{
if (null === $this->stream) {
throw new IOException('Cannot read from a closed input.');
}
if (feof($this->stream)) {
return null;
}
if (null !== $length) {
$data = fgets($this->stream, $length);
} else {
$data = fgets($this->stream);
}
if (false === $data && !feof($this->stream)) {
throw new IOException('Could not read stream.');
}
return $data ?: null;
}
/**
* {@inheritdoc}
*/
public function close()
{
if ($this->stream) {
@fclose($this->stream);
$this->stream = null;
}
}
/**
* {@inheritdoc}
*/
public function isClosed()
{
return null === $this->stream;
}
}