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<?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;

/**
 * Constraint that asserts that a string is valid JSON.
 */
class IsJson extends Constraint
{
   
/**
     * Evaluates the constraint for parameter $other. Returns true if the
     * constraint is met, false otherwise.
     *
     * @param mixed $other Value or object to evaluate.
     *
     * @return bool
     */
   
protected function matches($other)
    {
        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.
     *
     * @return string
     */
   
protected function failureDescription($other)
    {
        if (
$other === '') {
            return
'an empty string is valid JSON';
        }

        \
json_decode($other);
       
$error = JsonMatchesErrorMessageProvider::determineJsonError(
            \
json_last_error()
        );

        return \
sprintf(
           
'%s is valid JSON (%s)',
           
$this->exporter->shortenedExport($other),
           
$error
       
);
    }

   
/**
     * Returns a string representation of the constraint.
     *
     * @return string
     */
   
public function toString()
    {
        return
'is valid JSON';
    }
}