InjectTemplateListener.php

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<?php
namespace Magento\Setup\Mvc\View\Http;

use Zend\Mvc\MvcEvent;
use Zend\Mvc\View\Http\InjectTemplateListener as ZendInjectTemplateListener;

class InjectTemplateListener extends ZendInjectTemplateListener
{
    protected function deriveModuleNamespace($controller)
    {
        if (!strstr($controller, '\\')) {
            return '';
        }

        // Retrieve the first two elemenents representing the vendor and module name.
        $nsArray = explode('\\', $controller);
        $subNsArray = array_slice($nsArray, 0, 2);
        return implode('/', $subNsArray);
    }

    protected function deriveControllerSubNamespace($namespace)
    {
        if (!strstr($namespace, '\\')) {
            return '';
        }
        $nsArray = explode('\\', $namespace);

        // Remove the first three elements representing the vendor, module name and controller directory.
        $subNsArray = array_slice($nsArray, 3);
        if (empty($subNsArray)) {
            return '';
        }
        return implode('/', $subNsArray);
    }

    public function injectTemplate(MvcEvent $e)
    {
        $e->getRouteMatch()->setParam('action', null);
        parent::injectTemplate($e);
    }
}