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