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https://github.com/predis/predis.git
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Daniele Alessandri
5af2b628f1
With a negative number Predis will count from the end of the arguments list to calculate the actual number of keys that will be interpreted as elements for `KEYS` by the underlying `EVAL` command.
73 lines
1.9 KiB
PHP
73 lines
1.9 KiB
PHP
<?php
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/*
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* This file is part of the Predis package.
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*
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* (c) Daniele Alessandri <suppakilla@gmail.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 Predis\Commands;
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/**
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* Base class used to implement an higher level abstraction for "virtual"
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* commands based on EVAL.
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*
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* @link http://redis.io/commands/eval
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* @author Daniele Alessandri <suppakilla@gmail.com>
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*/
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abstract class ScriptedCommand extends ServerEval
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{
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/**
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* Gets the body of a Lua script.
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*
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* @return string
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*/
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public abstract function getScript();
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/**
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* Specifies the number of arguments that should be considered as keys.
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*
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* The default behaviour for the base class is to return FALSE to indicate that
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* all the elements of the arguments array should be considered as keys, but
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* subclasses can enforce a static number of keys.
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*
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* @todo How about returning 1 by default to make scripted commands act like
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* variadic ones where the first argument is the key (KEYS[1]) and the
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* rest are values (ARGV)?
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*
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* @return int|Boolean
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*/
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protected function getKeysCount()
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{
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return false;
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}
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/**
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* Returns the elements from the arguments that are identified as keys.
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*
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* @return array
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*/
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public function getKeys()
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{
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return array_slice($this->getArguments(), 2, $this->getKeysCount());
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}
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/**
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* {@inheritdoc}
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*/
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protected function filterArguments(Array $arguments)
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{
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if (false !== $numkeys = $this->getKeysCount()) {
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$numkeys = $numkeys >= 0 ? $numkeys : count($arguments) + $numkeys;
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}
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else {
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$numkeys = count($arguments);
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}
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return array_merge(array($this->getScript(), $numkeys), $arguments);
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}
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}
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