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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\Constraint;
use Webmozart\Expression\Expression;
use Webmozart\Expression\Logic\Literal;
use Webmozart\Expression\Util\StringUtil;
/**
* Checks that a value is one of a list of values.
*
* @since 1.0
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
final class In extends Literal
{
/**
* @var array
*/
private $acceptedValues;
/**
* @var bool
*/
private $strict;
/**
* Creates the expression.
*
* @param array $acceptedValues The accepted values.
* @param bool $strict Whether to do strict comparison.
*/
public function __construct(array $acceptedValues, $strict = true)
{
$this->acceptedValues = $acceptedValues;
$this->strict = $strict;
}
/**
* Returns the accepted values.
*
* @return array The accepted values.
*/
public function getAcceptedValues()
{
return $this->acceptedValues;
}
/**
* Returns whether the value is compared strictly.
*
* @return bool Returns `true` if using strict comparison (`===`) and
* `false` if using weak comparison (`==`).
*/
public function isStrict()
{
return $this->strict;
}
/**
* {@inheritdoc}
*/
public function evaluate($value)
{
return in_array($value, $this->acceptedValues, $this->strict);
}
/**
* {@inheritdoc}
*/
public function equivalentTo(Expression $other)
{
if (1 === count($this->acceptedValues)) {
// In is logically equivalent to Same if strict and only one value
if ($this->strict && $other instanceof Same) {
return reset($this->acceptedValues) === $other->getComparedValue();
}
// In is logically equivalent to Equals if not strict and only one value
if (!$this->strict && $other instanceof Equals) {
return reset($this->acceptedValues) == $other->getComparedValue();
}
}
// Since this class is final, we can check with instanceof
if (!$other instanceof $this) {
return false;
}
if ($this->strict !== $other->strict) {
return false;
}
if (!$this->strict) {
return $this->acceptedValues == $other->acceptedValues;
}
$acceptedValuesLeft = $this->acceptedValues;
$acceptedValuesRight = $other->acceptedValues;
// Ignore order
sort($acceptedValuesLeft);
sort($acceptedValuesRight);
return $acceptedValuesLeft === $acceptedValuesRight;
}
/**
* {@inheritdoc}
*/
public function toString()
{
$values = array_map(function ($value) {
return StringUtil::formatValue($value);
}, $this->acceptedValues);
return 'in('.implode(', ', $values).')';
}
}