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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 ); } }