ReverseResolver.php

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<?php
namespace Magento\Framework\Module\Dir;

use Magento\Framework\Module\Dir;
use Magento\Framework\Module\ModuleListInterface;

class ReverseResolver
{
    protected $_moduleList;

    protected $_moduleDirs;

    public function __construct(ModuleListInterface $moduleList, Dir $moduleDirs)
    {
        $this->_moduleList = $moduleList;
        $this->_moduleDirs = $moduleDirs;
    }

    public function getModuleName($path)
    {
        $path = str_replace('\\', '/', $path);
        foreach ($this->_moduleList->getNames() as $moduleName) {
            $moduleDir = $this->_moduleDirs->getDir($moduleName);
            $moduleDir = str_replace('\\', '/', $moduleDir);
            if ($path == $moduleDir || strpos($path, $moduleDir . '/') === 0) {
                return $moduleName;
            }
        }
        return null;
    }
}