Moved cache drivers outside core to extensions (plugins)

plugins/cache-redis/Predis/Response/Iterator/MultiBulkTuple.php

@@ -0,0 +1,90 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) Daniele Alessandri <suppakilla@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Response\Iterator;
+
+/**
+ * Outer iterator consuming streamable multibulk responses by yielding tuples of
+ * keys and values.
+ *
+ * This wrapper is useful for responses to commands such as `HGETALL` that can
+ * be iterater as $key => $value pairs.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+class MultiBulkTuple extends MultiBulk implements \OuterIterator
+{
+    private $iterator;
+
+    /**
+     * @param MultiBulk $iterator Inner multibulk response iterator.
+     */
+    public function __construct(MultiBulk $iterator)
+    {
+        $this->checkPreconditions($iterator);
+
+        $this->size = count($iterator) / 2;
+        $this->iterator = $iterator;
+        $this->position = $iterator->getPosition();
+        $this->current = $this->size > 0 ? $this->getValue() : null;
+    }
+
+    /**
+     * Checks for valid preconditions.
+     *
+     * @param MultiBulk $iterator Inner multibulk response iterator.
+     *
+     * @throws \InvalidArgumentException
+     * @throws \UnexpectedValueException
+     */
+    protected function checkPreconditions(MultiBulk $iterator)
+    {
+        if ($iterator->getPosition() !== 0) {
+            throw new \InvalidArgumentException(
+                'Cannot initialize a tuple iterator using an already initiated iterator.'
+            );
+        }
+
+        if (($size = count($iterator)) % 2 !== 0) {
+            throw new \UnexpectedValueException('Invalid response size for a tuple iterator.');
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getInnerIterator()
+    {
+        return $this->iterator;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __destruct()
+    {
+        $this->iterator->drop(true);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function getValue()
+    {
+        $k = $this->iterator->current();
+        $this->iterator->next();
+
+        $v = $this->iterator->current();
+        $this->iterator->next();
+
+        return array($k, $v);
+    }
+}