<?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\Commands;

abstract class ScriptedCommand extends ServerEval
{
    public abstract function getScript();

    protected function keysCount()
    {
        // The default behaviour for the base class is to use all the arguments
        // passed to a scripted command to populate the KEYS table in Lua.
        return count($this->getArguments());
    }

    protected function filterArguments(Array $arguments)
    {
        return array_merge(array($this->getScript(), $this->keysCount()), $arguments);
    }

    protected function getKeys()
    {
        return array_slice($this->getArguments(), 2, $this->keysCount());
    }
}