Package.php

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<?php
namespace Magento\Framework\Config\Composer;

class Package
{
    protected $json;

    public function __construct(\stdClass $json)
    {
        $this->json = $json;
    }

    public function getJson($formatted = true, $format = null)
    {
        if ($formatted) {
            if (null === $format) {
                $format = JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES;
            }
            return json_encode($this->json, $format) . "\n";
        }
        return $this->json;
    }

    public function get($propertyPath, $filter = null)
    {
        $result = $this->traverseGet($this->json, explode('->', $propertyPath));
        if ($result && $filter) {
            foreach ($result as $key => $value) {
                if (!preg_match($filter, $key)) {
                    unset($result->{$key});
                }
            }
        }
        return $result;
    }

    private function traverseGet(\StdClass $json, array $chain, $index = 0)
    {
        $property = $chain[$index];
        if (!property_exists($json, $property)) {
            return false;
        }
        if (isset($chain[$index + 1])) {
            return $this->traverseGet($json->{$property}, $chain, $index + 1);
        } else {
            return $json->{$property};
        }
    }
}