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<?php declare(strict_types=1);
/*
* 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 function json_decode;
use function json_last_error;
use function sprintf;
/**
* @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
*/
final class IsJson extends Constraint
{
/**
* Returns a string representation of the constraint.
*/
public function toString(): string
{
return 'is valid JSON';
}
/**
* Evaluates the constraint for parameter $other. Returns true if the
* constraint is met, false otherwise.
*
* @param mixed $other value or object to evaluate
*/
protected function matches($other): bool
{
if ($other === '') {
return false;
}
json_decode($other);
if (json_last_error()) {
return false;
}
return true;
}
/**
* Returns the description of the failure.
*
* The beginning of failure messages is "Failed asserting that" in most
* cases. This method should return the second part of that sentence.
*
* @param mixed $other evaluated value or object
*
* @throws \SebastianBergmann\RecursionContext\InvalidArgumentException
*/
protected function failureDescription($other): string
{
if ($other === '') {
return 'an empty string is valid JSON';
}
json_decode($other);
$error = (string) JsonMatchesErrorMessageProvider::determineJsonError(
(string) json_last_error()
);
return sprintf(
'%s is valid JSON (%s)',
$this->exporter()->shortenedExport($other),
$error
);
}
}