InputStream.php

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<?php
 
/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
 
namespace Symfony\Component\Process;
 
use Symfony\Component\Process\Exception\RuntimeException;
 
class InputStream implements \IteratorAggregate
{
    private $onEmpty = null;
    private $input = array();
    private $open = true;
 
    public function onEmpty(callable $onEmpty = null)
    {
        $this->onEmpty = $onEmpty;
    }
 
    public function write($input)
    {
        if (null === $input) {
            return;
        }
        if ($this->isClosed()) {
            throw new RuntimeException(sprintf('%s is closed', static::class));
        }
        $this->input[] = ProcessUtils::validateInput(__METHOD__, $input);
    }
 
    public function close()
    {
        $this->open = false;
    }
 
    public function isClosed()
    {
        return !$this->open;
    }
 
    public function getIterator()
    {
        $this->open = true;
 
        while ($this->open || $this->input) {
            if (!$this->input) {
                yield '';
                continue;
            }
            $current = array_shift($this->input);
 
            if ($current instanceof \Iterator) {
                foreach ($current as $cur) {
                    yield $cur;
                }
            } else {
                yield $current;
            }
            if (!$this->input && $this->open && null !== $onEmpty = $this->onEmpty) {
                $this->write($onEmpty($this));
            }
        }
    }
}