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vendor/symfony/process/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;
+
+/**
+ * Provides a way to continuously write to the input of a Process until the InputStream is closed.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class InputStream implements \IteratorAggregate
+{
+    /** @var callable|null */
+    private $onEmpty = null;
+    private $input = [];
+    private $open = true;
+
+    /**
+     * Sets a callback that is called when the write buffer becomes empty.
+     */
+    public function onEmpty(callable $onEmpty = null)
+    {
+        $this->onEmpty = $onEmpty;
+    }
+
+    /**
+     * Appends an input to the write buffer.
+     *
+     * @param resource|string|int|float|bool|\Traversable|null $input The input to append as scalar,
+     *                                                                stream resource or \Traversable
+     */
+    public function write($input)
+    {
+        if (null === $input) {
+            return;
+        }
+        if ($this->isClosed()) {
+            throw new RuntimeException(sprintf('%s is closed', static::class));
+        }
+        $this->input[] = ProcessUtils::validateInput(__METHOD__, $input);
+    }
+
+    /**
+     * Closes the write buffer.
+     */
+    public function close()
+    {
+        $this->open = false;
+    }
+
+    /**
+     * Tells whether the write buffer is closed or not.
+     */
+    public function isClosed()
+    {
+        return !$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) {
+                yield from $current;
+            } else {
+                yield $current;
+            }
+            if (!$this->input && $this->open && null !== $onEmpty = $this->onEmpty) {
+                $this->write($onEmpty($this));
+            }
+        }
+    }
+}