Moved cache drivers outside core to extensions (plugins)

plugins/cache-redis/Predis/Command/ScriptCommand.php

@@ -0,0 +1,77 @@
+<?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\Command;
+
+/**
+ * Base class used to implement an higher level abstraction for commands based
+ * on Lua scripting with EVAL and EVALSHA.
+ *
+ * @link http://redis.io/commands/eval
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+abstract class ScriptCommand extends ServerEvalSHA
+{
+    /**
+     * Gets the body of a Lua script.
+     *
+     * @return string
+     */
+    abstract public function getScript();
+
+    /**
+     * Specifies the number of arguments that should be considered as keys.
+     *
+     * The default behaviour for the base class is to return 0 to indicate that
+     * all the elements of the arguments array should be considered as keys, but
+     * subclasses can enforce a static number of keys.
+     *
+     * @return int
+     */
+    protected function getKeysCount()
+    {
+        return 0;
+    }
+
+    /**
+     * Returns the elements from the arguments that are identified as keys.
+     *
+     * @return array
+     */
+    public function getKeys()
+    {
+        return array_slice($this->getArguments(), 2, $this->getKeysCount());
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function filterArguments(array $arguments)
+    {
+        if (($numkeys = $this->getKeysCount()) && $numkeys < 0) {
+            $numkeys = count($arguments) + $numkeys;
+        }
+
+        return array_merge(array(sha1($this->getScript()), (int) $numkeys), $arguments);
+    }
+
+    /**
+     * @return array
+     */
+    public function getEvalArguments()
+    {
+        $arguments = $this->getArguments();
+        $arguments[0] = $this->getScript();
+
+        return $arguments;
+    }
+}