<?php
/*
* This file is part of PHPUnit.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace PHPUnit\Framework\Constraint;

use PHPUnit\Util\InvalidArgumentHelper;

/**
* Constraint that evaluates against a specified closure.
*/
class Callback extends Constraint
{
private $callback;

/**
* @param callable $callback
*
* @throws \PHPUnit\Framework\Exception
*/
public function __construct($callback)
{
if (!\is_callable($callback)) {
throw InvalidArgumentHelper::factory(
1,
'callable'
);
}

parent::__construct();

$this->callback = $callback;
}

/**
* Evaluates the constraint for parameter $value. Returns true if the
* constraint is met, false otherwise.
*
* @param mixed $other Value or object to evaluate.
*
* @return bool
*/
protected function matches($other)
{
return \call_user_func($this->callback, $other);
}

/**
* Returns a string representation of the constraint.
*
* @return string
*/
public function toString()
{
return 'is accepted by specified callback';
}
}