PreferencesResolving.php

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<?php
namespace Magento\Setup\Module\Di\Compiler\Config\Chain;

use Magento\Setup\Module\Di\Compiler\Config\ModificationInterface;

class PreferencesResolving implements ModificationInterface
{
    public function modify(array $config)
    {
        if (!isset($config['arguments'], $config['preferences'])) {
            return $config;
        }

        $this->resolvePreferences($config['arguments'], $config['preferences']);

        return $config;
    }

    private function resolvePreferences(&$argument, &$preferences)
    {
        if (!is_array($argument)) {
            return;
        }

        foreach ($argument as $key => &$value) {
            if (in_array($key, ['_i_', '_ins_'], true)) {
                $value = $this->resolvePreferenceRecursive($value, $preferences);
                continue;
            }

            if (is_array($value)) {
                $this->resolvePreferences($value, $preferences);
            }
        }
    }

    private function resolvePreferenceRecursive(&$value, &$preferences)
    {
        return isset($preferences[$value])
            ? $this->resolvePreferenceRecursive($preferences[$value], $preferences)
            : $value;
    }
}