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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;
/**
* Asserts whether or not two JSON objects are equal.
*/
class JsonMatches extends Constraint
{
/**
* @var string
*/
protected $value;
/**
* Creates a new constraint.
*
* @param string $value
*/
public function __construct($value)
{
parent::__construct();
$this->value = $value;
}
/**
* Evaluates the constraint for parameter $other. Returns true if the
* constraint is met, false otherwise.
*
* This method can be overridden to implement the evaluation algorithm.
*
* @param mixed $other Value or object to evaluate.
*
* @return bool
*/
protected function matches($other)
{
list($error, $recodedOther) = $this->canonicalizeJson($other);
if ($error) {
return false;
}
list($error, $recodedValue) = $this->canonicalizeJson($this->value);
if ($error) {
return false;
}
return $recodedOther == $recodedValue;
}
/*
* To allow comparison of JSON strings, first process them into a consistent
* format so that they can be compared as strings.
* @return array ($error, $canonicalized_json) The $error parameter is used
* to indicate an error decoding the json. This is used to avoid ambiguity
* with JSON strings consisting entirely of 'null' or 'false'.
*/
private function canonicalizeJson($json)
{
$decodedJson = json_decode($json, true);
if (json_last_error()) {
return [true, null];
}
$this->recursiveSort($decodedJson);
$reencodedJson = json_encode($decodedJson);
return [false, $reencodedJson];
}
/*
* JSON object keys are unordered while PHP array keys are ordered.
* Sort all array keys to ensure both the expected and actual values have
* their keys in the same order.
*/
private function recursiveSort(&$json)
{
if (is_array($json)) {
ksort($json);
foreach ($json as $key => &$value) {
$this->recursiveSort($value);
}
}
}
/**
* Returns a string representation of the object.
*
* @return string
*/
public function toString()
{
return sprintf(
'matches JSON string "%s"',
$this->value
);
}
}
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