How does Magento\Setup\Module\Di\Compiler\Config\Chain\PreferencesResolving work?

dmitrii_fediuk · October 14, 2017, 12:36am

Context: How are the generated/medatata files generated in Magento 2.2?

magento/magento2/blob/2.2.0/setup/src/Magento/Setup/Module/Di/Compiler/Config/Chain/PreferencesResolving.php#L11-L69


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


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


    return $config;
}


/**
 * Replaces interfaces to their concrete implementations in scope of current config
 *
 * @param array $argument
 * @param array $preferences
 * @return array
 */
private function resolvePreferences(&$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);
        }
    }
}


/**
 * Resolves preference recursively
 *
 * @param string $value
 * @param array $preferences
 *
 * @return string
 */
private function resolvePreferenceRecursive(&$value, &$preferences)
{
    return isset($preferences[$value])
        ? $this->resolvePreferenceRecursive($preferences[$value], $preferences)
        : $value;
}
}