<?php
/**
* JSONPath implementation for PHP.
*
* @license https://github.com/SoftCreatR/JSONPath/blob/main/LICENSE MIT License
*/
declare(strict_types=1);
namespace Flow\JSONPath\Filters;
use Flow\JSONPath\{AccessHelper, JSONPathException};
use function count;
use function preg_match;
class QueryResultFilter extends AbstractFilter
{
/**
* @inheritDoc
*
* @throws JSONPathException
*/
public function filter($collection): array
{
preg_match('/@\.(?<key>\w+)\s*(?<operator>[-+*\/])\s*(?<numeric>\d+)/', $this->token->value, $matches);
$matchKey = $matches['key'];
if (AccessHelper::keyExists($collection, $matchKey, $this->magicIsAllowed)) {
$value = AccessHelper::getValue($collection, $matchKey, $this->magicIsAllowed);
} elseif ($matches['key'] === 'length') {
$value = count($collection);
} else {
return [];
}
switch ($matches['operator']) {
case '+':
$resultKey = $value + $matches['numeric'];
break;
case '*':
$resultKey = $value * $matches['numeric'];
break;
case '-':
$resultKey = $value - $matches['numeric'];
break;
case '/':
$resultKey = $value / $matches['numeric'];
break;
default:
throw new JSONPathException('Unsupported operator in expression');
}
$result = [];
if (AccessHelper::keyExists($collection, $resultKey, $this->magicIsAllowed)) {
$result[] = AccessHelper::getValue($collection, $resultKey, $this->magicIsAllowed);
}
return $result;
}
}
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