94 lines
2.3 KiB
PHP
94 lines
2.3 KiB
PHP
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<?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 !$this->open;
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}
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/**
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* @return \Traversable
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*/
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public function getIterator()
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{
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$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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yield from $current;
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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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