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<?php
/*
* This file is part of the webmozart/expression package.
*
* (c) Bernhard Schussek <bschussek@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Webmozart\Expression\Selector;
use Webmozart\Expression\Expression;
use Webmozart\Expression\Logic\Conjunction;
use Webmozart\Expression\Logic\Disjunction;
/**
* Checks whether an array key matches an expression.
*
* @since 1.0
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
final class Key extends Selector
{
/**
* @var string
*/
private $key;
/**
* Creates the expression.
*
* @param string|int $key The array key.
* @param Expression $expr The expression to evaluate for the key.
*/
public function __construct($key, Expression $expr)
{
parent::__construct($expr);
$this->key = (string) $key;
}
/**
* Returns the array key.
*
* @return string|int The array key.
*/
public function getKey()
{
return $this->key;
}
/**
* {@inheritdoc}
*/
public function evaluate($value)
{
if (!is_array($value)) {
return false;
}
if (!array_key_exists($this->key, $value)) {
return false;
}
return $this->expr->evaluate($value[$this->key]);
}
/**
* {@inheritdoc}
*/
public function equivalentTo(Expression $other)
{
if (!parent::equivalentTo($other)) {
return false;
}
/* @var static $other */
return $this->key === $other->key;
}
/**
* {@inheritdoc}
*/
public function toString()
{
$exprString = $this->expr->toString();
if ($this->expr instanceof Conjunction || $this->expr instanceof Disjunction) {
return $this->key.'{'.$exprString.'}';
}
// Append "functions" with "."
if (isset($exprString[0]) && ctype_alpha($exprString[0])) {
return $this->key.'.'.$exprString;
}
return $this->key.$exprString;
}
}