<?php

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/*

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* This file is part of the Symfony package.

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*

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* (c) Fabien Potencier <fabien@symfony.com>

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*

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* For the full copyright and license information, please view the LICENSE

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* file that was distributed with this source code.

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*/

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namespace Symfony\Component\Process;

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use Symfony\Component\Process\Exception\RuntimeException;

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/**

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* Provides a way to continuously write to the input of a Process until the InputStream is closed.

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*

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* @author Nicolas Grekas <p@tchwork.com>

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*/

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class InputStream implements \IteratorAggregate

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{

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/** @var callable|null */

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private $onEmpty = null;

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private $input = [];

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private $open = true;

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/**

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* Sets a callback that is called when the write buffer becomes empty.

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*/

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public function onEmpty(callable $onEmpty = null)

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{

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$this->onEmpty = $onEmpty;

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}

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/**

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* Appends an input to the write buffer.

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*

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* @param resource|string|int|float|bool|\Traversable|null $input The input to append as scalar,

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* stream resource or \Traversable

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*/

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public function write($input)

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{

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if (null === $input) {

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return;

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}

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if ($this->isClosed()) {

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throw new RuntimeException(sprintf('"%s" is closed.', static::class));

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}

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$this->input[] = ProcessUtils::validateInput(__METHOD__, $input);

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}

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/**

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* Closes the write buffer.

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*/

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public function close()

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{

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$this->open = false;

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}

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/**

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* Tells whether the write buffer is closed or not.

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*/

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public function isClosed()

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{

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return !$this->open;

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}

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public function getIterator()

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{

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$this->open = true;

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while ($this->open || $this->input) {

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if (!$this->input) {

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yield '';

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continue;

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}

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$current = array_shift($this->input);

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if ($current instanceof \Iterator) {

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foreach ($current as $cur) {

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yield $cur;

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}

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} else {

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yield $current;

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}

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if (!$this->input && $this->open && null !== $onEmpty = $this->onEmpty) {

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$this->write($onEmpty($this));

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}

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}

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}

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}

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